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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Florian Westphal](/assets/img/avatar_default.png)
Andrii Nakryiko writes:
And we currently don't have an attach type for NETLINK BPF link.
Thankfully it's not too late to add it. I see that link_create() in
kernel/bpf/syscall.c just bypasses attach_type check. We shouldn't
have done that. Instead we need to add BPF_NETLINK attach type to enum
bpf_attach_type. And wire all that properly throughout the kernel and
libbpf itself.
This adds BPF_NETFILTER and uses it. This breaks uabi but this
wasn't in any non-rc release yet, so it should be fine.
v2: check link_attack prog type in link_create too
Fixes: 84601d6ee6
("bpf: add bpf_link support for BPF_NETFILTER programs")
Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/CAEf4BzZ69YgrQW7DHCJUT_X+GqMq_ZQQPBwopaJJVGFD5=d5Vg@mail.gmail.com/
Link: https://lore.kernel.org/bpf/20230605131445.32016-1-fw@strlen.de
7173 lines
262 KiB
C
7173 lines
262 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#ifndef _UAPI__LINUX_BPF_H__
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#define _UAPI__LINUX_BPF_H__
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#include <linux/types.h>
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#include <linux/bpf_common.h>
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/* Extended instruction set based on top of classic BPF */
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/* instruction classes */
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#define BPF_JMP32 0x06 /* jmp mode in word width */
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#define BPF_ALU64 0x07 /* alu mode in double word width */
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/* ld/ldx fields */
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#define BPF_DW 0x18 /* double word (64-bit) */
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#define BPF_ATOMIC 0xc0 /* atomic memory ops - op type in immediate */
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#define BPF_XADD 0xc0 /* exclusive add - legacy name */
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/* alu/jmp fields */
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#define BPF_MOV 0xb0 /* mov reg to reg */
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#define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */
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/* change endianness of a register */
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#define BPF_END 0xd0 /* flags for endianness conversion: */
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#define BPF_TO_LE 0x00 /* convert to little-endian */
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#define BPF_TO_BE 0x08 /* convert to big-endian */
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#define BPF_FROM_LE BPF_TO_LE
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#define BPF_FROM_BE BPF_TO_BE
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/* jmp encodings */
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#define BPF_JNE 0x50 /* jump != */
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#define BPF_JLT 0xa0 /* LT is unsigned, '<' */
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#define BPF_JLE 0xb0 /* LE is unsigned, '<=' */
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#define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */
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#define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */
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#define BPF_JSLT 0xc0 /* SLT is signed, '<' */
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#define BPF_JSLE 0xd0 /* SLE is signed, '<=' */
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#define BPF_CALL 0x80 /* function call */
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#define BPF_EXIT 0x90 /* function return */
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/* atomic op type fields (stored in immediate) */
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#define BPF_FETCH 0x01 /* not an opcode on its own, used to build others */
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#define BPF_XCHG (0xe0 | BPF_FETCH) /* atomic exchange */
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#define BPF_CMPXCHG (0xf0 | BPF_FETCH) /* atomic compare-and-write */
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/* Register numbers */
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enum {
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BPF_REG_0 = 0,
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BPF_REG_1,
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BPF_REG_2,
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BPF_REG_3,
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BPF_REG_4,
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BPF_REG_5,
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BPF_REG_6,
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BPF_REG_7,
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BPF_REG_8,
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BPF_REG_9,
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BPF_REG_10,
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__MAX_BPF_REG,
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};
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/* BPF has 10 general purpose 64-bit registers and stack frame. */
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#define MAX_BPF_REG __MAX_BPF_REG
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struct bpf_insn {
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__u8 code; /* opcode */
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__u8 dst_reg:4; /* dest register */
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__u8 src_reg:4; /* source register */
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__s16 off; /* signed offset */
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__s32 imm; /* signed immediate constant */
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};
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/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
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struct bpf_lpm_trie_key {
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__u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */
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__u8 data[0]; /* Arbitrary size */
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};
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struct bpf_cgroup_storage_key {
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__u64 cgroup_inode_id; /* cgroup inode id */
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__u32 attach_type; /* program attach type (enum bpf_attach_type) */
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};
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enum bpf_cgroup_iter_order {
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BPF_CGROUP_ITER_ORDER_UNSPEC = 0,
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BPF_CGROUP_ITER_SELF_ONLY, /* process only a single object. */
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BPF_CGROUP_ITER_DESCENDANTS_PRE, /* walk descendants in pre-order. */
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BPF_CGROUP_ITER_DESCENDANTS_POST, /* walk descendants in post-order. */
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BPF_CGROUP_ITER_ANCESTORS_UP, /* walk ancestors upward. */
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};
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union bpf_iter_link_info {
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struct {
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__u32 map_fd;
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} map;
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struct {
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enum bpf_cgroup_iter_order order;
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/* At most one of cgroup_fd and cgroup_id can be non-zero. If
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* both are zero, the walk starts from the default cgroup v2
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* root. For walking v1 hierarchy, one should always explicitly
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* specify cgroup_fd.
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*/
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__u32 cgroup_fd;
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__u64 cgroup_id;
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} cgroup;
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/* Parameters of task iterators. */
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struct {
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__u32 tid;
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__u32 pid;
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__u32 pid_fd;
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} task;
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};
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/* BPF syscall commands, see bpf(2) man-page for more details. */
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/**
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* DOC: eBPF Syscall Preamble
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*
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* The operation to be performed by the **bpf**\ () system call is determined
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* by the *cmd* argument. Each operation takes an accompanying argument,
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* provided via *attr*, which is a pointer to a union of type *bpf_attr* (see
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* below). The size argument is the size of the union pointed to by *attr*.
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*/
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/**
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* DOC: eBPF Syscall Commands
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*
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* BPF_MAP_CREATE
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* Description
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* Create a map and return a file descriptor that refers to the
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* map. The close-on-exec file descriptor flag (see **fcntl**\ (2))
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* is automatically enabled for the new file descriptor.
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*
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* Applying **close**\ (2) to the file descriptor returned by
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* **BPF_MAP_CREATE** will delete the map (but see NOTES).
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*
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* Return
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* A new file descriptor (a nonnegative integer), or -1 if an
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* error occurred (in which case, *errno* is set appropriately).
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*
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* BPF_MAP_LOOKUP_ELEM
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* Description
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* Look up an element with a given *key* in the map referred to
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* by the file descriptor *map_fd*.
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*
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* The *flags* argument may be specified as one of the
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* following:
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*
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* **BPF_F_LOCK**
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* Look up the value of a spin-locked map without
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* returning the lock. This must be specified if the
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* elements contain a spinlock.
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* BPF_MAP_UPDATE_ELEM
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* Description
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* Create or update an element (key/value pair) in a specified map.
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*
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* The *flags* argument should be specified as one of the
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* following:
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*
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* **BPF_ANY**
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* Create a new element or update an existing element.
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* **BPF_NOEXIST**
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* Create a new element only if it did not exist.
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* **BPF_EXIST**
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* Update an existing element.
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* **BPF_F_LOCK**
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* Update a spin_lock-ed map element.
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* May set *errno* to **EINVAL**, **EPERM**, **ENOMEM**,
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* **E2BIG**, **EEXIST**, or **ENOENT**.
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*
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* **E2BIG**
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* The number of elements in the map reached the
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* *max_entries* limit specified at map creation time.
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* **EEXIST**
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* If *flags* specifies **BPF_NOEXIST** and the element
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* with *key* already exists in the map.
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* **ENOENT**
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* If *flags* specifies **BPF_EXIST** and the element with
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* *key* does not exist in the map.
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*
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* BPF_MAP_DELETE_ELEM
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* Description
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* Look up and delete an element by key in a specified map.
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* BPF_MAP_GET_NEXT_KEY
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* Description
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* Look up an element by key in a specified map and return the key
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* of the next element. Can be used to iterate over all elements
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* in the map.
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* The following cases can be used to iterate over all elements of
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* the map:
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*
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* * If *key* is not found, the operation returns zero and sets
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* the *next_key* pointer to the key of the first element.
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* * If *key* is found, the operation returns zero and sets the
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* *next_key* pointer to the key of the next element.
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* * If *key* is the last element, returns -1 and *errno* is set
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* to **ENOENT**.
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*
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* May set *errno* to **ENOMEM**, **EFAULT**, **EPERM**, or
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* **EINVAL** on error.
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*
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* BPF_PROG_LOAD
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* Description
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* Verify and load an eBPF program, returning a new file
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* descriptor associated with the program.
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*
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* Applying **close**\ (2) to the file descriptor returned by
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* **BPF_PROG_LOAD** will unload the eBPF program (but see NOTES).
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*
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* The close-on-exec file descriptor flag (see **fcntl**\ (2)) is
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* automatically enabled for the new file descriptor.
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*
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* Return
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* A new file descriptor (a nonnegative integer), or -1 if an
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* error occurred (in which case, *errno* is set appropriately).
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*
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* BPF_OBJ_PIN
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* Description
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* Pin an eBPF program or map referred by the specified *bpf_fd*
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* to the provided *pathname* on the filesystem.
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*
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* The *pathname* argument must not contain a dot (".").
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*
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* On success, *pathname* retains a reference to the eBPF object,
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* preventing deallocation of the object when the original
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* *bpf_fd* is closed. This allow the eBPF object to live beyond
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* **close**\ (\ *bpf_fd*\ ), and hence the lifetime of the parent
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* process.
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*
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* Applying **unlink**\ (2) or similar calls to the *pathname*
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* unpins the object from the filesystem, removing the reference.
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* If no other file descriptors or filesystem nodes refer to the
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* same object, it will be deallocated (see NOTES).
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*
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* The filesystem type for the parent directory of *pathname* must
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* be **BPF_FS_MAGIC**.
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* BPF_OBJ_GET
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* Description
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* Open a file descriptor for the eBPF object pinned to the
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* specified *pathname*.
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*
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* Return
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* A new file descriptor (a nonnegative integer), or -1 if an
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* error occurred (in which case, *errno* is set appropriately).
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*
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* BPF_PROG_ATTACH
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* Description
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* Attach an eBPF program to a *target_fd* at the specified
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* *attach_type* hook.
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*
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* The *attach_type* specifies the eBPF attachment point to
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* attach the program to, and must be one of *bpf_attach_type*
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* (see below).
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*
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* The *attach_bpf_fd* must be a valid file descriptor for a
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* loaded eBPF program of a cgroup, flow dissector, LIRC, sockmap
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* or sock_ops type corresponding to the specified *attach_type*.
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*
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* The *target_fd* must be a valid file descriptor for a kernel
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* object which depends on the attach type of *attach_bpf_fd*:
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*
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* **BPF_PROG_TYPE_CGROUP_DEVICE**,
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* **BPF_PROG_TYPE_CGROUP_SKB**,
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* **BPF_PROG_TYPE_CGROUP_SOCK**,
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* **BPF_PROG_TYPE_CGROUP_SOCK_ADDR**,
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* **BPF_PROG_TYPE_CGROUP_SOCKOPT**,
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* **BPF_PROG_TYPE_CGROUP_SYSCTL**,
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* **BPF_PROG_TYPE_SOCK_OPS**
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*
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* Control Group v2 hierarchy with the eBPF controller
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* enabled. Requires the kernel to be compiled with
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* **CONFIG_CGROUP_BPF**.
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*
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* **BPF_PROG_TYPE_FLOW_DISSECTOR**
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*
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* Network namespace (eg /proc/self/ns/net).
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*
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* **BPF_PROG_TYPE_LIRC_MODE2**
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*
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* LIRC device path (eg /dev/lircN). Requires the kernel
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* to be compiled with **CONFIG_BPF_LIRC_MODE2**.
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*
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* **BPF_PROG_TYPE_SK_SKB**,
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* **BPF_PROG_TYPE_SK_MSG**
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*
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* eBPF map of socket type (eg **BPF_MAP_TYPE_SOCKHASH**).
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* BPF_PROG_DETACH
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* Description
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* Detach the eBPF program associated with the *target_fd* at the
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* hook specified by *attach_type*. The program must have been
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* previously attached using **BPF_PROG_ATTACH**.
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* BPF_PROG_TEST_RUN
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* Description
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* Run the eBPF program associated with the *prog_fd* a *repeat*
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* number of times against a provided program context *ctx_in* and
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* data *data_in*, and return the modified program context
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* *ctx_out*, *data_out* (for example, packet data), result of the
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* execution *retval*, and *duration* of the test run.
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*
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* The sizes of the buffers provided as input and output
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* parameters *ctx_in*, *ctx_out*, *data_in*, and *data_out* must
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* be provided in the corresponding variables *ctx_size_in*,
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* *ctx_size_out*, *data_size_in*, and/or *data_size_out*. If any
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* of these parameters are not provided (ie set to NULL), the
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* corresponding size field must be zero.
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*
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* Some program types have particular requirements:
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*
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* **BPF_PROG_TYPE_SK_LOOKUP**
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* *data_in* and *data_out* must be NULL.
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*
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* **BPF_PROG_TYPE_RAW_TRACEPOINT**,
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* **BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE**
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*
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* *ctx_out*, *data_in* and *data_out* must be NULL.
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* *repeat* must be zero.
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*
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* BPF_PROG_RUN is an alias for BPF_PROG_TEST_RUN.
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*
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* Return
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* Returns zero on success. On error, -1 is returned and *errno*
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* is set appropriately.
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*
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* **ENOSPC**
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* Either *data_size_out* or *ctx_size_out* is too small.
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* **ENOTSUPP**
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* This command is not supported by the program type of
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* the program referred to by *prog_fd*.
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*
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* BPF_PROG_GET_NEXT_ID
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* Description
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* Fetch the next eBPF program currently loaded into the kernel.
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*
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* Looks for the eBPF program with an id greater than *start_id*
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* and updates *next_id* on success. If no other eBPF programs
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* remain with ids higher than *start_id*, returns -1 and sets
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* *errno* to **ENOENT**.
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*
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* Return
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* Returns zero on success. On error, or when no id remains, -1
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* is returned and *errno* is set appropriately.
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*
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* BPF_MAP_GET_NEXT_ID
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* Description
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* Fetch the next eBPF map currently loaded into the kernel.
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*
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* Looks for the eBPF map with an id greater than *start_id*
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* and updates *next_id* on success. If no other eBPF maps
|
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* remain with ids higher than *start_id*, returns -1 and sets
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* *errno* to **ENOENT**.
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*
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* Return
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* Returns zero on success. On error, or when no id remains, -1
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* is returned and *errno* is set appropriately.
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*
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* BPF_PROG_GET_FD_BY_ID
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* Description
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* Open a file descriptor for the eBPF program corresponding to
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* *prog_id*.
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*
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* Return
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* A new file descriptor (a nonnegative integer), or -1 if an
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* error occurred (in which case, *errno* is set appropriately).
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*
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* BPF_MAP_GET_FD_BY_ID
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* Description
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* Open a file descriptor for the eBPF map corresponding to
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* *map_id*.
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*
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* Return
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* A new file descriptor (a nonnegative integer), or -1 if an
|
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* error occurred (in which case, *errno* is set appropriately).
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*
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* BPF_OBJ_GET_INFO_BY_FD
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* Description
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* Obtain information about the eBPF object corresponding to
|
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* *bpf_fd*.
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*
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* Populates up to *info_len* bytes of *info*, which will be in
|
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* one of the following formats depending on the eBPF object type
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* of *bpf_fd*:
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*
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* * **struct bpf_prog_info**
|
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* * **struct bpf_map_info**
|
|
* * **struct bpf_btf_info**
|
|
* * **struct bpf_link_info**
|
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*
|
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* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_PROG_QUERY
|
|
* Description
|
|
* Obtain information about eBPF programs associated with the
|
|
* specified *attach_type* hook.
|
|
*
|
|
* The *target_fd* must be a valid file descriptor for a kernel
|
|
* object which depends on the attach type of *attach_bpf_fd*:
|
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*
|
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* **BPF_PROG_TYPE_CGROUP_DEVICE**,
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|
* **BPF_PROG_TYPE_CGROUP_SKB**,
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* **BPF_PROG_TYPE_CGROUP_SOCK**,
|
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* **BPF_PROG_TYPE_CGROUP_SOCK_ADDR**,
|
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* **BPF_PROG_TYPE_CGROUP_SOCKOPT**,
|
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* **BPF_PROG_TYPE_CGROUP_SYSCTL**,
|
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* **BPF_PROG_TYPE_SOCK_OPS**
|
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*
|
|
* Control Group v2 hierarchy with the eBPF controller
|
|
* enabled. Requires the kernel to be compiled with
|
|
* **CONFIG_CGROUP_BPF**.
|
|
*
|
|
* **BPF_PROG_TYPE_FLOW_DISSECTOR**
|
|
*
|
|
* Network namespace (eg /proc/self/ns/net).
|
|
*
|
|
* **BPF_PROG_TYPE_LIRC_MODE2**
|
|
*
|
|
* LIRC device path (eg /dev/lircN). Requires the kernel
|
|
* to be compiled with **CONFIG_BPF_LIRC_MODE2**.
|
|
*
|
|
* **BPF_PROG_QUERY** always fetches the number of programs
|
|
* attached and the *attach_flags* which were used to attach those
|
|
* programs. Additionally, if *prog_ids* is nonzero and the number
|
|
* of attached programs is less than *prog_cnt*, populates
|
|
* *prog_ids* with the eBPF program ids of the programs attached
|
|
* at *target_fd*.
|
|
*
|
|
* The following flags may alter the result:
|
|
*
|
|
* **BPF_F_QUERY_EFFECTIVE**
|
|
* Only return information regarding programs which are
|
|
* currently effective at the specified *target_fd*.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_RAW_TRACEPOINT_OPEN
|
|
* Description
|
|
* Attach an eBPF program to a tracepoint *name* to access kernel
|
|
* internal arguments of the tracepoint in their raw form.
|
|
*
|
|
* The *prog_fd* must be a valid file descriptor associated with
|
|
* a loaded eBPF program of type **BPF_PROG_TYPE_RAW_TRACEPOINT**.
|
|
*
|
|
* No ABI guarantees are made about the content of tracepoint
|
|
* arguments exposed to the corresponding eBPF program.
|
|
*
|
|
* Applying **close**\ (2) to the file descriptor returned by
|
|
* **BPF_RAW_TRACEPOINT_OPEN** will delete the map (but see NOTES).
|
|
*
|
|
* Return
|
|
* A new file descriptor (a nonnegative integer), or -1 if an
|
|
* error occurred (in which case, *errno* is set appropriately).
|
|
*
|
|
* BPF_BTF_LOAD
|
|
* Description
|
|
* Verify and load BPF Type Format (BTF) metadata into the kernel,
|
|
* returning a new file descriptor associated with the metadata.
|
|
* BTF is described in more detail at
|
|
* https://www.kernel.org/doc/html/latest/bpf/btf.html.
|
|
*
|
|
* The *btf* parameter must point to valid memory providing
|
|
* *btf_size* bytes of BTF binary metadata.
|
|
*
|
|
* The returned file descriptor can be passed to other **bpf**\ ()
|
|
* subcommands such as **BPF_PROG_LOAD** or **BPF_MAP_CREATE** to
|
|
* associate the BTF with those objects.
|
|
*
|
|
* Similar to **BPF_PROG_LOAD**, **BPF_BTF_LOAD** has optional
|
|
* parameters to specify a *btf_log_buf*, *btf_log_size* and
|
|
* *btf_log_level* which allow the kernel to return freeform log
|
|
* output regarding the BTF verification process.
|
|
*
|
|
* Return
|
|
* A new file descriptor (a nonnegative integer), or -1 if an
|
|
* error occurred (in which case, *errno* is set appropriately).
|
|
*
|
|
* BPF_BTF_GET_FD_BY_ID
|
|
* Description
|
|
* Open a file descriptor for the BPF Type Format (BTF)
|
|
* corresponding to *btf_id*.
|
|
*
|
|
* Return
|
|
* A new file descriptor (a nonnegative integer), or -1 if an
|
|
* error occurred (in which case, *errno* is set appropriately).
|
|
*
|
|
* BPF_TASK_FD_QUERY
|
|
* Description
|
|
* Obtain information about eBPF programs associated with the
|
|
* target process identified by *pid* and *fd*.
|
|
*
|
|
* If the *pid* and *fd* are associated with a tracepoint, kprobe
|
|
* or uprobe perf event, then the *prog_id* and *fd_type* will
|
|
* be populated with the eBPF program id and file descriptor type
|
|
* of type **bpf_task_fd_type**. If associated with a kprobe or
|
|
* uprobe, the *probe_offset* and *probe_addr* will also be
|
|
* populated. Optionally, if *buf* is provided, then up to
|
|
* *buf_len* bytes of *buf* will be populated with the name of
|
|
* the tracepoint, kprobe or uprobe.
|
|
*
|
|
* The resulting *prog_id* may be introspected in deeper detail
|
|
* using **BPF_PROG_GET_FD_BY_ID** and **BPF_OBJ_GET_INFO_BY_FD**.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_MAP_LOOKUP_AND_DELETE_ELEM
|
|
* Description
|
|
* Look up an element with the given *key* in the map referred to
|
|
* by the file descriptor *fd*, and if found, delete the element.
|
|
*
|
|
* For **BPF_MAP_TYPE_QUEUE** and **BPF_MAP_TYPE_STACK** map
|
|
* types, the *flags* argument needs to be set to 0, but for other
|
|
* map types, it may be specified as:
|
|
*
|
|
* **BPF_F_LOCK**
|
|
* Look up and delete the value of a spin-locked map
|
|
* without returning the lock. This must be specified if
|
|
* the elements contain a spinlock.
|
|
*
|
|
* The **BPF_MAP_TYPE_QUEUE** and **BPF_MAP_TYPE_STACK** map types
|
|
* implement this command as a "pop" operation, deleting the top
|
|
* element rather than one corresponding to *key*.
|
|
* The *key* and *key_len* parameters should be zeroed when
|
|
* issuing this operation for these map types.
|
|
*
|
|
* This command is only valid for the following map types:
|
|
* * **BPF_MAP_TYPE_QUEUE**
|
|
* * **BPF_MAP_TYPE_STACK**
|
|
* * **BPF_MAP_TYPE_HASH**
|
|
* * **BPF_MAP_TYPE_PERCPU_HASH**
|
|
* * **BPF_MAP_TYPE_LRU_HASH**
|
|
* * **BPF_MAP_TYPE_LRU_PERCPU_HASH**
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_MAP_FREEZE
|
|
* Description
|
|
* Freeze the permissions of the specified map.
|
|
*
|
|
* Write permissions may be frozen by passing zero *flags*.
|
|
* Upon success, no future syscall invocations may alter the
|
|
* map state of *map_fd*. Write operations from eBPF programs
|
|
* are still possible for a frozen map.
|
|
*
|
|
* Not supported for maps of type **BPF_MAP_TYPE_STRUCT_OPS**.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_BTF_GET_NEXT_ID
|
|
* Description
|
|
* Fetch the next BPF Type Format (BTF) object currently loaded
|
|
* into the kernel.
|
|
*
|
|
* Looks for the BTF object with an id greater than *start_id*
|
|
* and updates *next_id* on success. If no other BTF objects
|
|
* remain with ids higher than *start_id*, returns -1 and sets
|
|
* *errno* to **ENOENT**.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, or when no id remains, -1
|
|
* is returned and *errno* is set appropriately.
|
|
*
|
|
* BPF_MAP_LOOKUP_BATCH
|
|
* Description
|
|
* Iterate and fetch multiple elements in a map.
|
|
*
|
|
* Two opaque values are used to manage batch operations,
|
|
* *in_batch* and *out_batch*. Initially, *in_batch* must be set
|
|
* to NULL to begin the batched operation. After each subsequent
|
|
* **BPF_MAP_LOOKUP_BATCH**, the caller should pass the resultant
|
|
* *out_batch* as the *in_batch* for the next operation to
|
|
* continue iteration from the current point.
|
|
*
|
|
* The *keys* and *values* are output parameters which must point
|
|
* to memory large enough to hold *count* items based on the key
|
|
* and value size of the map *map_fd*. The *keys* buffer must be
|
|
* of *key_size* * *count*. The *values* buffer must be of
|
|
* *value_size* * *count*.
|
|
*
|
|
* The *elem_flags* argument may be specified as one of the
|
|
* following:
|
|
*
|
|
* **BPF_F_LOCK**
|
|
* Look up the value of a spin-locked map without
|
|
* returning the lock. This must be specified if the
|
|
* elements contain a spinlock.
|
|
*
|
|
* On success, *count* elements from the map are copied into the
|
|
* user buffer, with the keys copied into *keys* and the values
|
|
* copied into the corresponding indices in *values*.
|
|
*
|
|
* If an error is returned and *errno* is not **EFAULT**, *count*
|
|
* is set to the number of successfully processed elements.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* May set *errno* to **ENOSPC** to indicate that *keys* or
|
|
* *values* is too small to dump an entire bucket during
|
|
* iteration of a hash-based map type.
|
|
*
|
|
* BPF_MAP_LOOKUP_AND_DELETE_BATCH
|
|
* Description
|
|
* Iterate and delete all elements in a map.
|
|
*
|
|
* This operation has the same behavior as
|
|
* **BPF_MAP_LOOKUP_BATCH** with two exceptions:
|
|
*
|
|
* * Every element that is successfully returned is also deleted
|
|
* from the map. This is at least *count* elements. Note that
|
|
* *count* is both an input and an output parameter.
|
|
* * Upon returning with *errno* set to **EFAULT**, up to
|
|
* *count* elements may be deleted without returning the keys
|
|
* and values of the deleted elements.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_MAP_UPDATE_BATCH
|
|
* Description
|
|
* Update multiple elements in a map by *key*.
|
|
*
|
|
* The *keys* and *values* are input parameters which must point
|
|
* to memory large enough to hold *count* items based on the key
|
|
* and value size of the map *map_fd*. The *keys* buffer must be
|
|
* of *key_size* * *count*. The *values* buffer must be of
|
|
* *value_size* * *count*.
|
|
*
|
|
* Each element specified in *keys* is sequentially updated to the
|
|
* value in the corresponding index in *values*. The *in_batch*
|
|
* and *out_batch* parameters are ignored and should be zeroed.
|
|
*
|
|
* The *elem_flags* argument should be specified as one of the
|
|
* following:
|
|
*
|
|
* **BPF_ANY**
|
|
* Create new elements or update a existing elements.
|
|
* **BPF_NOEXIST**
|
|
* Create new elements only if they do not exist.
|
|
* **BPF_EXIST**
|
|
* Update existing elements.
|
|
* **BPF_F_LOCK**
|
|
* Update spin_lock-ed map elements. This must be
|
|
* specified if the map value contains a spinlock.
|
|
*
|
|
* On success, *count* elements from the map are updated.
|
|
*
|
|
* If an error is returned and *errno* is not **EFAULT**, *count*
|
|
* is set to the number of successfully processed elements.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* May set *errno* to **EINVAL**, **EPERM**, **ENOMEM**, or
|
|
* **E2BIG**. **E2BIG** indicates that the number of elements in
|
|
* the map reached the *max_entries* limit specified at map
|
|
* creation time.
|
|
*
|
|
* May set *errno* to one of the following error codes under
|
|
* specific circumstances:
|
|
*
|
|
* **EEXIST**
|
|
* If *flags* specifies **BPF_NOEXIST** and the element
|
|
* with *key* already exists in the map.
|
|
* **ENOENT**
|
|
* If *flags* specifies **BPF_EXIST** and the element with
|
|
* *key* does not exist in the map.
|
|
*
|
|
* BPF_MAP_DELETE_BATCH
|
|
* Description
|
|
* Delete multiple elements in a map by *key*.
|
|
*
|
|
* The *keys* parameter is an input parameter which must point
|
|
* to memory large enough to hold *count* items based on the key
|
|
* size of the map *map_fd*, that is, *key_size* * *count*.
|
|
*
|
|
* Each element specified in *keys* is sequentially deleted. The
|
|
* *in_batch*, *out_batch*, and *values* parameters are ignored
|
|
* and should be zeroed.
|
|
*
|
|
* The *elem_flags* argument may be specified as one of the
|
|
* following:
|
|
*
|
|
* **BPF_F_LOCK**
|
|
* Look up the value of a spin-locked map without
|
|
* returning the lock. This must be specified if the
|
|
* elements contain a spinlock.
|
|
*
|
|
* On success, *count* elements from the map are updated.
|
|
*
|
|
* If an error is returned and *errno* is not **EFAULT**, *count*
|
|
* is set to the number of successfully processed elements. If
|
|
* *errno* is **EFAULT**, up to *count* elements may be been
|
|
* deleted.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_LINK_CREATE
|
|
* Description
|
|
* Attach an eBPF program to a *target_fd* at the specified
|
|
* *attach_type* hook and return a file descriptor handle for
|
|
* managing the link.
|
|
*
|
|
* Return
|
|
* A new file descriptor (a nonnegative integer), or -1 if an
|
|
* error occurred (in which case, *errno* is set appropriately).
|
|
*
|
|
* BPF_LINK_UPDATE
|
|
* Description
|
|
* Update the eBPF program in the specified *link_fd* to
|
|
* *new_prog_fd*.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_LINK_GET_FD_BY_ID
|
|
* Description
|
|
* Open a file descriptor for the eBPF Link corresponding to
|
|
* *link_id*.
|
|
*
|
|
* Return
|
|
* A new file descriptor (a nonnegative integer), or -1 if an
|
|
* error occurred (in which case, *errno* is set appropriately).
|
|
*
|
|
* BPF_LINK_GET_NEXT_ID
|
|
* Description
|
|
* Fetch the next eBPF link currently loaded into the kernel.
|
|
*
|
|
* Looks for the eBPF link with an id greater than *start_id*
|
|
* and updates *next_id* on success. If no other eBPF links
|
|
* remain with ids higher than *start_id*, returns -1 and sets
|
|
* *errno* to **ENOENT**.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, or when no id remains, -1
|
|
* is returned and *errno* is set appropriately.
|
|
*
|
|
* BPF_ENABLE_STATS
|
|
* Description
|
|
* Enable eBPF runtime statistics gathering.
|
|
*
|
|
* Runtime statistics gathering for the eBPF runtime is disabled
|
|
* by default to minimize the corresponding performance overhead.
|
|
* This command enables statistics globally.
|
|
*
|
|
* Multiple programs may independently enable statistics.
|
|
* After gathering the desired statistics, eBPF runtime statistics
|
|
* may be disabled again by calling **close**\ (2) for the file
|
|
* descriptor returned by this function. Statistics will only be
|
|
* disabled system-wide when all outstanding file descriptors
|
|
* returned by prior calls for this subcommand are closed.
|
|
*
|
|
* Return
|
|
* A new file descriptor (a nonnegative integer), or -1 if an
|
|
* error occurred (in which case, *errno* is set appropriately).
|
|
*
|
|
* BPF_ITER_CREATE
|
|
* Description
|
|
* Create an iterator on top of the specified *link_fd* (as
|
|
* previously created using **BPF_LINK_CREATE**) and return a
|
|
* file descriptor that can be used to trigger the iteration.
|
|
*
|
|
* If the resulting file descriptor is pinned to the filesystem
|
|
* using **BPF_OBJ_PIN**, then subsequent **read**\ (2) syscalls
|
|
* for that path will trigger the iterator to read kernel state
|
|
* using the eBPF program attached to *link_fd*.
|
|
*
|
|
* Return
|
|
* A new file descriptor (a nonnegative integer), or -1 if an
|
|
* error occurred (in which case, *errno* is set appropriately).
|
|
*
|
|
* BPF_LINK_DETACH
|
|
* Description
|
|
* Forcefully detach the specified *link_fd* from its
|
|
* corresponding attachment point.
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* BPF_PROG_BIND_MAP
|
|
* Description
|
|
* Bind a map to the lifetime of an eBPF program.
|
|
*
|
|
* The map identified by *map_fd* is bound to the program
|
|
* identified by *prog_fd* and only released when *prog_fd* is
|
|
* released. This may be used in cases where metadata should be
|
|
* associated with a program which otherwise does not contain any
|
|
* references to the map (for example, embedded in the eBPF
|
|
* program instructions).
|
|
*
|
|
* Return
|
|
* Returns zero on success. On error, -1 is returned and *errno*
|
|
* is set appropriately.
|
|
*
|
|
* NOTES
|
|
* eBPF objects (maps and programs) can be shared between processes.
|
|
*
|
|
* * After **fork**\ (2), the child inherits file descriptors
|
|
* referring to the same eBPF objects.
|
|
* * File descriptors referring to eBPF objects can be transferred over
|
|
* **unix**\ (7) domain sockets.
|
|
* * File descriptors referring to eBPF objects can be duplicated in the
|
|
* usual way, using **dup**\ (2) and similar calls.
|
|
* * File descriptors referring to eBPF objects can be pinned to the
|
|
* filesystem using the **BPF_OBJ_PIN** command of **bpf**\ (2).
|
|
*
|
|
* An eBPF object is deallocated only after all file descriptors referring
|
|
* to the object have been closed and no references remain pinned to the
|
|
* filesystem or attached (for example, bound to a program or device).
|
|
*/
|
|
enum bpf_cmd {
|
|
BPF_MAP_CREATE,
|
|
BPF_MAP_LOOKUP_ELEM,
|
|
BPF_MAP_UPDATE_ELEM,
|
|
BPF_MAP_DELETE_ELEM,
|
|
BPF_MAP_GET_NEXT_KEY,
|
|
BPF_PROG_LOAD,
|
|
BPF_OBJ_PIN,
|
|
BPF_OBJ_GET,
|
|
BPF_PROG_ATTACH,
|
|
BPF_PROG_DETACH,
|
|
BPF_PROG_TEST_RUN,
|
|
BPF_PROG_RUN = BPF_PROG_TEST_RUN,
|
|
BPF_PROG_GET_NEXT_ID,
|
|
BPF_MAP_GET_NEXT_ID,
|
|
BPF_PROG_GET_FD_BY_ID,
|
|
BPF_MAP_GET_FD_BY_ID,
|
|
BPF_OBJ_GET_INFO_BY_FD,
|
|
BPF_PROG_QUERY,
|
|
BPF_RAW_TRACEPOINT_OPEN,
|
|
BPF_BTF_LOAD,
|
|
BPF_BTF_GET_FD_BY_ID,
|
|
BPF_TASK_FD_QUERY,
|
|
BPF_MAP_LOOKUP_AND_DELETE_ELEM,
|
|
BPF_MAP_FREEZE,
|
|
BPF_BTF_GET_NEXT_ID,
|
|
BPF_MAP_LOOKUP_BATCH,
|
|
BPF_MAP_LOOKUP_AND_DELETE_BATCH,
|
|
BPF_MAP_UPDATE_BATCH,
|
|
BPF_MAP_DELETE_BATCH,
|
|
BPF_LINK_CREATE,
|
|
BPF_LINK_UPDATE,
|
|
BPF_LINK_GET_FD_BY_ID,
|
|
BPF_LINK_GET_NEXT_ID,
|
|
BPF_ENABLE_STATS,
|
|
BPF_ITER_CREATE,
|
|
BPF_LINK_DETACH,
|
|
BPF_PROG_BIND_MAP,
|
|
};
|
|
|
|
enum bpf_map_type {
|
|
BPF_MAP_TYPE_UNSPEC,
|
|
BPF_MAP_TYPE_HASH,
|
|
BPF_MAP_TYPE_ARRAY,
|
|
BPF_MAP_TYPE_PROG_ARRAY,
|
|
BPF_MAP_TYPE_PERF_EVENT_ARRAY,
|
|
BPF_MAP_TYPE_PERCPU_HASH,
|
|
BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
BPF_MAP_TYPE_STACK_TRACE,
|
|
BPF_MAP_TYPE_CGROUP_ARRAY,
|
|
BPF_MAP_TYPE_LRU_HASH,
|
|
BPF_MAP_TYPE_LRU_PERCPU_HASH,
|
|
BPF_MAP_TYPE_LPM_TRIE,
|
|
BPF_MAP_TYPE_ARRAY_OF_MAPS,
|
|
BPF_MAP_TYPE_HASH_OF_MAPS,
|
|
BPF_MAP_TYPE_DEVMAP,
|
|
BPF_MAP_TYPE_SOCKMAP,
|
|
BPF_MAP_TYPE_CPUMAP,
|
|
BPF_MAP_TYPE_XSKMAP,
|
|
BPF_MAP_TYPE_SOCKHASH,
|
|
BPF_MAP_TYPE_CGROUP_STORAGE_DEPRECATED,
|
|
/* BPF_MAP_TYPE_CGROUP_STORAGE is available to bpf programs attaching
|
|
* to a cgroup. The newer BPF_MAP_TYPE_CGRP_STORAGE is available to
|
|
* both cgroup-attached and other progs and supports all functionality
|
|
* provided by BPF_MAP_TYPE_CGROUP_STORAGE. So mark
|
|
* BPF_MAP_TYPE_CGROUP_STORAGE deprecated.
|
|
*/
|
|
BPF_MAP_TYPE_CGROUP_STORAGE = BPF_MAP_TYPE_CGROUP_STORAGE_DEPRECATED,
|
|
BPF_MAP_TYPE_REUSEPORT_SOCKARRAY,
|
|
BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE,
|
|
BPF_MAP_TYPE_QUEUE,
|
|
BPF_MAP_TYPE_STACK,
|
|
BPF_MAP_TYPE_SK_STORAGE,
|
|
BPF_MAP_TYPE_DEVMAP_HASH,
|
|
BPF_MAP_TYPE_STRUCT_OPS,
|
|
BPF_MAP_TYPE_RINGBUF,
|
|
BPF_MAP_TYPE_INODE_STORAGE,
|
|
BPF_MAP_TYPE_TASK_STORAGE,
|
|
BPF_MAP_TYPE_BLOOM_FILTER,
|
|
BPF_MAP_TYPE_USER_RINGBUF,
|
|
BPF_MAP_TYPE_CGRP_STORAGE,
|
|
};
|
|
|
|
/* Note that tracing related programs such as
|
|
* BPF_PROG_TYPE_{KPROBE,TRACEPOINT,PERF_EVENT,RAW_TRACEPOINT}
|
|
* are not subject to a stable API since kernel internal data
|
|
* structures can change from release to release and may
|
|
* therefore break existing tracing BPF programs. Tracing BPF
|
|
* programs correspond to /a/ specific kernel which is to be
|
|
* analyzed, and not /a/ specific kernel /and/ all future ones.
|
|
*/
|
|
enum bpf_prog_type {
|
|
BPF_PROG_TYPE_UNSPEC,
|
|
BPF_PROG_TYPE_SOCKET_FILTER,
|
|
BPF_PROG_TYPE_KPROBE,
|
|
BPF_PROG_TYPE_SCHED_CLS,
|
|
BPF_PROG_TYPE_SCHED_ACT,
|
|
BPF_PROG_TYPE_TRACEPOINT,
|
|
BPF_PROG_TYPE_XDP,
|
|
BPF_PROG_TYPE_PERF_EVENT,
|
|
BPF_PROG_TYPE_CGROUP_SKB,
|
|
BPF_PROG_TYPE_CGROUP_SOCK,
|
|
BPF_PROG_TYPE_LWT_IN,
|
|
BPF_PROG_TYPE_LWT_OUT,
|
|
BPF_PROG_TYPE_LWT_XMIT,
|
|
BPF_PROG_TYPE_SOCK_OPS,
|
|
BPF_PROG_TYPE_SK_SKB,
|
|
BPF_PROG_TYPE_CGROUP_DEVICE,
|
|
BPF_PROG_TYPE_SK_MSG,
|
|
BPF_PROG_TYPE_RAW_TRACEPOINT,
|
|
BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
|
|
BPF_PROG_TYPE_LWT_SEG6LOCAL,
|
|
BPF_PROG_TYPE_LIRC_MODE2,
|
|
BPF_PROG_TYPE_SK_REUSEPORT,
|
|
BPF_PROG_TYPE_FLOW_DISSECTOR,
|
|
BPF_PROG_TYPE_CGROUP_SYSCTL,
|
|
BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE,
|
|
BPF_PROG_TYPE_CGROUP_SOCKOPT,
|
|
BPF_PROG_TYPE_TRACING,
|
|
BPF_PROG_TYPE_STRUCT_OPS,
|
|
BPF_PROG_TYPE_EXT,
|
|
BPF_PROG_TYPE_LSM,
|
|
BPF_PROG_TYPE_SK_LOOKUP,
|
|
BPF_PROG_TYPE_SYSCALL, /* a program that can execute syscalls */
|
|
BPF_PROG_TYPE_NETFILTER,
|
|
};
|
|
|
|
enum bpf_attach_type {
|
|
BPF_CGROUP_INET_INGRESS,
|
|
BPF_CGROUP_INET_EGRESS,
|
|
BPF_CGROUP_INET_SOCK_CREATE,
|
|
BPF_CGROUP_SOCK_OPS,
|
|
BPF_SK_SKB_STREAM_PARSER,
|
|
BPF_SK_SKB_STREAM_VERDICT,
|
|
BPF_CGROUP_DEVICE,
|
|
BPF_SK_MSG_VERDICT,
|
|
BPF_CGROUP_INET4_BIND,
|
|
BPF_CGROUP_INET6_BIND,
|
|
BPF_CGROUP_INET4_CONNECT,
|
|
BPF_CGROUP_INET6_CONNECT,
|
|
BPF_CGROUP_INET4_POST_BIND,
|
|
BPF_CGROUP_INET6_POST_BIND,
|
|
BPF_CGROUP_UDP4_SENDMSG,
|
|
BPF_CGROUP_UDP6_SENDMSG,
|
|
BPF_LIRC_MODE2,
|
|
BPF_FLOW_DISSECTOR,
|
|
BPF_CGROUP_SYSCTL,
|
|
BPF_CGROUP_UDP4_RECVMSG,
|
|
BPF_CGROUP_UDP6_RECVMSG,
|
|
BPF_CGROUP_GETSOCKOPT,
|
|
BPF_CGROUP_SETSOCKOPT,
|
|
BPF_TRACE_RAW_TP,
|
|
BPF_TRACE_FENTRY,
|
|
BPF_TRACE_FEXIT,
|
|
BPF_MODIFY_RETURN,
|
|
BPF_LSM_MAC,
|
|
BPF_TRACE_ITER,
|
|
BPF_CGROUP_INET4_GETPEERNAME,
|
|
BPF_CGROUP_INET6_GETPEERNAME,
|
|
BPF_CGROUP_INET4_GETSOCKNAME,
|
|
BPF_CGROUP_INET6_GETSOCKNAME,
|
|
BPF_XDP_DEVMAP,
|
|
BPF_CGROUP_INET_SOCK_RELEASE,
|
|
BPF_XDP_CPUMAP,
|
|
BPF_SK_LOOKUP,
|
|
BPF_XDP,
|
|
BPF_SK_SKB_VERDICT,
|
|
BPF_SK_REUSEPORT_SELECT,
|
|
BPF_SK_REUSEPORT_SELECT_OR_MIGRATE,
|
|
BPF_PERF_EVENT,
|
|
BPF_TRACE_KPROBE_MULTI,
|
|
BPF_LSM_CGROUP,
|
|
BPF_STRUCT_OPS,
|
|
BPF_NETFILTER,
|
|
__MAX_BPF_ATTACH_TYPE
|
|
};
|
|
|
|
#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
|
|
|
|
enum bpf_link_type {
|
|
BPF_LINK_TYPE_UNSPEC = 0,
|
|
BPF_LINK_TYPE_RAW_TRACEPOINT = 1,
|
|
BPF_LINK_TYPE_TRACING = 2,
|
|
BPF_LINK_TYPE_CGROUP = 3,
|
|
BPF_LINK_TYPE_ITER = 4,
|
|
BPF_LINK_TYPE_NETNS = 5,
|
|
BPF_LINK_TYPE_XDP = 6,
|
|
BPF_LINK_TYPE_PERF_EVENT = 7,
|
|
BPF_LINK_TYPE_KPROBE_MULTI = 8,
|
|
BPF_LINK_TYPE_STRUCT_OPS = 9,
|
|
BPF_LINK_TYPE_NETFILTER = 10,
|
|
|
|
MAX_BPF_LINK_TYPE,
|
|
};
|
|
|
|
/* cgroup-bpf attach flags used in BPF_PROG_ATTACH command
|
|
*
|
|
* NONE(default): No further bpf programs allowed in the subtree.
|
|
*
|
|
* BPF_F_ALLOW_OVERRIDE: If a sub-cgroup installs some bpf program,
|
|
* the program in this cgroup yields to sub-cgroup program.
|
|
*
|
|
* BPF_F_ALLOW_MULTI: If a sub-cgroup installs some bpf program,
|
|
* that cgroup program gets run in addition to the program in this cgroup.
|
|
*
|
|
* Only one program is allowed to be attached to a cgroup with
|
|
* NONE or BPF_F_ALLOW_OVERRIDE flag.
|
|
* Attaching another program on top of NONE or BPF_F_ALLOW_OVERRIDE will
|
|
* release old program and attach the new one. Attach flags has to match.
|
|
*
|
|
* Multiple programs are allowed to be attached to a cgroup with
|
|
* BPF_F_ALLOW_MULTI flag. They are executed in FIFO order
|
|
* (those that were attached first, run first)
|
|
* The programs of sub-cgroup are executed first, then programs of
|
|
* this cgroup and then programs of parent cgroup.
|
|
* When children program makes decision (like picking TCP CA or sock bind)
|
|
* parent program has a chance to override it.
|
|
*
|
|
* With BPF_F_ALLOW_MULTI a new program is added to the end of the list of
|
|
* programs for a cgroup. Though it's possible to replace an old program at
|
|
* any position by also specifying BPF_F_REPLACE flag and position itself in
|
|
* replace_bpf_fd attribute. Old program at this position will be released.
|
|
*
|
|
* A cgroup with MULTI or OVERRIDE flag allows any attach flags in sub-cgroups.
|
|
* A cgroup with NONE doesn't allow any programs in sub-cgroups.
|
|
* Ex1:
|
|
* cgrp1 (MULTI progs A, B) ->
|
|
* cgrp2 (OVERRIDE prog C) ->
|
|
* cgrp3 (MULTI prog D) ->
|
|
* cgrp4 (OVERRIDE prog E) ->
|
|
* cgrp5 (NONE prog F)
|
|
* the event in cgrp5 triggers execution of F,D,A,B in that order.
|
|
* if prog F is detached, the execution is E,D,A,B
|
|
* if prog F and D are detached, the execution is E,A,B
|
|
* if prog F, E and D are detached, the execution is C,A,B
|
|
*
|
|
* All eligible programs are executed regardless of return code from
|
|
* earlier programs.
|
|
*/
|
|
#define BPF_F_ALLOW_OVERRIDE (1U << 0)
|
|
#define BPF_F_ALLOW_MULTI (1U << 1)
|
|
#define BPF_F_REPLACE (1U << 2)
|
|
|
|
/* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the
|
|
* verifier will perform strict alignment checking as if the kernel
|
|
* has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set,
|
|
* and NET_IP_ALIGN defined to 2.
|
|
*/
|
|
#define BPF_F_STRICT_ALIGNMENT (1U << 0)
|
|
|
|
/* If BPF_F_ANY_ALIGNMENT is used in BPF_PROG_LOAD command, the
|
|
* verifier will allow any alignment whatsoever. On platforms
|
|
* with strict alignment requirements for loads ands stores (such
|
|
* as sparc and mips) the verifier validates that all loads and
|
|
* stores provably follow this requirement. This flag turns that
|
|
* checking and enforcement off.
|
|
*
|
|
* It is mostly used for testing when we want to validate the
|
|
* context and memory access aspects of the verifier, but because
|
|
* of an unaligned access the alignment check would trigger before
|
|
* the one we are interested in.
|
|
*/
|
|
#define BPF_F_ANY_ALIGNMENT (1U << 1)
|
|
|
|
/* BPF_F_TEST_RND_HI32 is used in BPF_PROG_LOAD command for testing purpose.
|
|
* Verifier does sub-register def/use analysis and identifies instructions whose
|
|
* def only matters for low 32-bit, high 32-bit is never referenced later
|
|
* through implicit zero extension. Therefore verifier notifies JIT back-ends
|
|
* that it is safe to ignore clearing high 32-bit for these instructions. This
|
|
* saves some back-ends a lot of code-gen. However such optimization is not
|
|
* necessary on some arches, for example x86_64, arm64 etc, whose JIT back-ends
|
|
* hence hasn't used verifier's analysis result. But, we really want to have a
|
|
* way to be able to verify the correctness of the described optimization on
|
|
* x86_64 on which testsuites are frequently exercised.
|
|
*
|
|
* So, this flag is introduced. Once it is set, verifier will randomize high
|
|
* 32-bit for those instructions who has been identified as safe to ignore them.
|
|
* Then, if verifier is not doing correct analysis, such randomization will
|
|
* regress tests to expose bugs.
|
|
*/
|
|
#define BPF_F_TEST_RND_HI32 (1U << 2)
|
|
|
|
/* The verifier internal test flag. Behavior is undefined */
|
|
#define BPF_F_TEST_STATE_FREQ (1U << 3)
|
|
|
|
/* If BPF_F_SLEEPABLE is used in BPF_PROG_LOAD command, the verifier will
|
|
* restrict map and helper usage for such programs. Sleepable BPF programs can
|
|
* only be attached to hooks where kernel execution context allows sleeping.
|
|
* Such programs are allowed to use helpers that may sleep like
|
|
* bpf_copy_from_user().
|
|
*/
|
|
#define BPF_F_SLEEPABLE (1U << 4)
|
|
|
|
/* If BPF_F_XDP_HAS_FRAGS is used in BPF_PROG_LOAD command, the loaded program
|
|
* fully support xdp frags.
|
|
*/
|
|
#define BPF_F_XDP_HAS_FRAGS (1U << 5)
|
|
|
|
/* If BPF_F_XDP_DEV_BOUND_ONLY is used in BPF_PROG_LOAD command, the loaded
|
|
* program becomes device-bound but can access XDP metadata.
|
|
*/
|
|
#define BPF_F_XDP_DEV_BOUND_ONLY (1U << 6)
|
|
|
|
/* link_create.kprobe_multi.flags used in LINK_CREATE command for
|
|
* BPF_TRACE_KPROBE_MULTI attach type to create return probe.
|
|
*/
|
|
#define BPF_F_KPROBE_MULTI_RETURN (1U << 0)
|
|
|
|
/* When BPF ldimm64's insn[0].src_reg != 0 then this can have
|
|
* the following extensions:
|
|
*
|
|
* insn[0].src_reg: BPF_PSEUDO_MAP_[FD|IDX]
|
|
* insn[0].imm: map fd or fd_idx
|
|
* insn[1].imm: 0
|
|
* insn[0].off: 0
|
|
* insn[1].off: 0
|
|
* ldimm64 rewrite: address of map
|
|
* verifier type: CONST_PTR_TO_MAP
|
|
*/
|
|
#define BPF_PSEUDO_MAP_FD 1
|
|
#define BPF_PSEUDO_MAP_IDX 5
|
|
|
|
/* insn[0].src_reg: BPF_PSEUDO_MAP_[IDX_]VALUE
|
|
* insn[0].imm: map fd or fd_idx
|
|
* insn[1].imm: offset into value
|
|
* insn[0].off: 0
|
|
* insn[1].off: 0
|
|
* ldimm64 rewrite: address of map[0]+offset
|
|
* verifier type: PTR_TO_MAP_VALUE
|
|
*/
|
|
#define BPF_PSEUDO_MAP_VALUE 2
|
|
#define BPF_PSEUDO_MAP_IDX_VALUE 6
|
|
|
|
/* insn[0].src_reg: BPF_PSEUDO_BTF_ID
|
|
* insn[0].imm: kernel btd id of VAR
|
|
* insn[1].imm: 0
|
|
* insn[0].off: 0
|
|
* insn[1].off: 0
|
|
* ldimm64 rewrite: address of the kernel variable
|
|
* verifier type: PTR_TO_BTF_ID or PTR_TO_MEM, depending on whether the var
|
|
* is struct/union.
|
|
*/
|
|
#define BPF_PSEUDO_BTF_ID 3
|
|
/* insn[0].src_reg: BPF_PSEUDO_FUNC
|
|
* insn[0].imm: insn offset to the func
|
|
* insn[1].imm: 0
|
|
* insn[0].off: 0
|
|
* insn[1].off: 0
|
|
* ldimm64 rewrite: address of the function
|
|
* verifier type: PTR_TO_FUNC.
|
|
*/
|
|
#define BPF_PSEUDO_FUNC 4
|
|
|
|
/* when bpf_call->src_reg == BPF_PSEUDO_CALL, bpf_call->imm == pc-relative
|
|
* offset to another bpf function
|
|
*/
|
|
#define BPF_PSEUDO_CALL 1
|
|
/* when bpf_call->src_reg == BPF_PSEUDO_KFUNC_CALL,
|
|
* bpf_call->imm == btf_id of a BTF_KIND_FUNC in the running kernel
|
|
*/
|
|
#define BPF_PSEUDO_KFUNC_CALL 2
|
|
|
|
/* flags for BPF_MAP_UPDATE_ELEM command */
|
|
enum {
|
|
BPF_ANY = 0, /* create new element or update existing */
|
|
BPF_NOEXIST = 1, /* create new element if it didn't exist */
|
|
BPF_EXIST = 2, /* update existing element */
|
|
BPF_F_LOCK = 4, /* spin_lock-ed map_lookup/map_update */
|
|
};
|
|
|
|
/* flags for BPF_MAP_CREATE command */
|
|
enum {
|
|
BPF_F_NO_PREALLOC = (1U << 0),
|
|
/* Instead of having one common LRU list in the
|
|
* BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list
|
|
* which can scale and perform better.
|
|
* Note, the LRU nodes (including free nodes) cannot be moved
|
|
* across different LRU lists.
|
|
*/
|
|
BPF_F_NO_COMMON_LRU = (1U << 1),
|
|
/* Specify numa node during map creation */
|
|
BPF_F_NUMA_NODE = (1U << 2),
|
|
|
|
/* Flags for accessing BPF object from syscall side. */
|
|
BPF_F_RDONLY = (1U << 3),
|
|
BPF_F_WRONLY = (1U << 4),
|
|
|
|
/* Flag for stack_map, store build_id+offset instead of pointer */
|
|
BPF_F_STACK_BUILD_ID = (1U << 5),
|
|
|
|
/* Zero-initialize hash function seed. This should only be used for testing. */
|
|
BPF_F_ZERO_SEED = (1U << 6),
|
|
|
|
/* Flags for accessing BPF object from program side. */
|
|
BPF_F_RDONLY_PROG = (1U << 7),
|
|
BPF_F_WRONLY_PROG = (1U << 8),
|
|
|
|
/* Clone map from listener for newly accepted socket */
|
|
BPF_F_CLONE = (1U << 9),
|
|
|
|
/* Enable memory-mapping BPF map */
|
|
BPF_F_MMAPABLE = (1U << 10),
|
|
|
|
/* Share perf_event among processes */
|
|
BPF_F_PRESERVE_ELEMS = (1U << 11),
|
|
|
|
/* Create a map that is suitable to be an inner map with dynamic max entries */
|
|
BPF_F_INNER_MAP = (1U << 12),
|
|
|
|
/* Create a map that will be registered/unregesitered by the backed bpf_link */
|
|
BPF_F_LINK = (1U << 13),
|
|
};
|
|
|
|
/* Flags for BPF_PROG_QUERY. */
|
|
|
|
/* Query effective (directly attached + inherited from ancestor cgroups)
|
|
* programs that will be executed for events within a cgroup.
|
|
* attach_flags with this flag are always returned 0.
|
|
*/
|
|
#define BPF_F_QUERY_EFFECTIVE (1U << 0)
|
|
|
|
/* Flags for BPF_PROG_TEST_RUN */
|
|
|
|
/* If set, run the test on the cpu specified by bpf_attr.test.cpu */
|
|
#define BPF_F_TEST_RUN_ON_CPU (1U << 0)
|
|
/* If set, XDP frames will be transmitted after processing */
|
|
#define BPF_F_TEST_XDP_LIVE_FRAMES (1U << 1)
|
|
|
|
/* type for BPF_ENABLE_STATS */
|
|
enum bpf_stats_type {
|
|
/* enabled run_time_ns and run_cnt */
|
|
BPF_STATS_RUN_TIME = 0,
|
|
};
|
|
|
|
enum bpf_stack_build_id_status {
|
|
/* user space need an empty entry to identify end of a trace */
|
|
BPF_STACK_BUILD_ID_EMPTY = 0,
|
|
/* with valid build_id and offset */
|
|
BPF_STACK_BUILD_ID_VALID = 1,
|
|
/* couldn't get build_id, fallback to ip */
|
|
BPF_STACK_BUILD_ID_IP = 2,
|
|
};
|
|
|
|
#define BPF_BUILD_ID_SIZE 20
|
|
struct bpf_stack_build_id {
|
|
__s32 status;
|
|
unsigned char build_id[BPF_BUILD_ID_SIZE];
|
|
union {
|
|
__u64 offset;
|
|
__u64 ip;
|
|
};
|
|
};
|
|
|
|
#define BPF_OBJ_NAME_LEN 16U
|
|
|
|
union bpf_attr {
|
|
struct { /* anonymous struct used by BPF_MAP_CREATE command */
|
|
__u32 map_type; /* one of enum bpf_map_type */
|
|
__u32 key_size; /* size of key in bytes */
|
|
__u32 value_size; /* size of value in bytes */
|
|
__u32 max_entries; /* max number of entries in a map */
|
|
__u32 map_flags; /* BPF_MAP_CREATE related
|
|
* flags defined above.
|
|
*/
|
|
__u32 inner_map_fd; /* fd pointing to the inner map */
|
|
__u32 numa_node; /* numa node (effective only if
|
|
* BPF_F_NUMA_NODE is set).
|
|
*/
|
|
char map_name[BPF_OBJ_NAME_LEN];
|
|
__u32 map_ifindex; /* ifindex of netdev to create on */
|
|
__u32 btf_fd; /* fd pointing to a BTF type data */
|
|
__u32 btf_key_type_id; /* BTF type_id of the key */
|
|
__u32 btf_value_type_id; /* BTF type_id of the value */
|
|
__u32 btf_vmlinux_value_type_id;/* BTF type_id of a kernel-
|
|
* struct stored as the
|
|
* map value
|
|
*/
|
|
/* Any per-map-type extra fields
|
|
*
|
|
* BPF_MAP_TYPE_BLOOM_FILTER - the lowest 4 bits indicate the
|
|
* number of hash functions (if 0, the bloom filter will default
|
|
* to using 5 hash functions).
|
|
*/
|
|
__u64 map_extra;
|
|
};
|
|
|
|
struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
|
|
__u32 map_fd;
|
|
__aligned_u64 key;
|
|
union {
|
|
__aligned_u64 value;
|
|
__aligned_u64 next_key;
|
|
};
|
|
__u64 flags;
|
|
};
|
|
|
|
struct { /* struct used by BPF_MAP_*_BATCH commands */
|
|
__aligned_u64 in_batch; /* start batch,
|
|
* NULL to start from beginning
|
|
*/
|
|
__aligned_u64 out_batch; /* output: next start batch */
|
|
__aligned_u64 keys;
|
|
__aligned_u64 values;
|
|
__u32 count; /* input/output:
|
|
* input: # of key/value
|
|
* elements
|
|
* output: # of filled elements
|
|
*/
|
|
__u32 map_fd;
|
|
__u64 elem_flags;
|
|
__u64 flags;
|
|
} batch;
|
|
|
|
struct { /* anonymous struct used by BPF_PROG_LOAD command */
|
|
__u32 prog_type; /* one of enum bpf_prog_type */
|
|
__u32 insn_cnt;
|
|
__aligned_u64 insns;
|
|
__aligned_u64 license;
|
|
__u32 log_level; /* verbosity level of verifier */
|
|
__u32 log_size; /* size of user buffer */
|
|
__aligned_u64 log_buf; /* user supplied buffer */
|
|
__u32 kern_version; /* not used */
|
|
__u32 prog_flags;
|
|
char prog_name[BPF_OBJ_NAME_LEN];
|
|
__u32 prog_ifindex; /* ifindex of netdev to prep for */
|
|
/* For some prog types expected attach type must be known at
|
|
* load time to verify attach type specific parts of prog
|
|
* (context accesses, allowed helpers, etc).
|
|
*/
|
|
__u32 expected_attach_type;
|
|
__u32 prog_btf_fd; /* fd pointing to BTF type data */
|
|
__u32 func_info_rec_size; /* userspace bpf_func_info size */
|
|
__aligned_u64 func_info; /* func info */
|
|
__u32 func_info_cnt; /* number of bpf_func_info records */
|
|
__u32 line_info_rec_size; /* userspace bpf_line_info size */
|
|
__aligned_u64 line_info; /* line info */
|
|
__u32 line_info_cnt; /* number of bpf_line_info records */
|
|
__u32 attach_btf_id; /* in-kernel BTF type id to attach to */
|
|
union {
|
|
/* valid prog_fd to attach to bpf prog */
|
|
__u32 attach_prog_fd;
|
|
/* or valid module BTF object fd or 0 to attach to vmlinux */
|
|
__u32 attach_btf_obj_fd;
|
|
};
|
|
__u32 core_relo_cnt; /* number of bpf_core_relo */
|
|
__aligned_u64 fd_array; /* array of FDs */
|
|
__aligned_u64 core_relos;
|
|
__u32 core_relo_rec_size; /* sizeof(struct bpf_core_relo) */
|
|
/* output: actual total log contents size (including termintaing zero).
|
|
* It could be both larger than original log_size (if log was
|
|
* truncated), or smaller (if log buffer wasn't filled completely).
|
|
*/
|
|
__u32 log_true_size;
|
|
};
|
|
|
|
struct { /* anonymous struct used by BPF_OBJ_* commands */
|
|
__aligned_u64 pathname;
|
|
__u32 bpf_fd;
|
|
__u32 file_flags;
|
|
};
|
|
|
|
struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */
|
|
__u32 target_fd; /* container object to attach to */
|
|
__u32 attach_bpf_fd; /* eBPF program to attach */
|
|
__u32 attach_type;
|
|
__u32 attach_flags;
|
|
__u32 replace_bpf_fd; /* previously attached eBPF
|
|
* program to replace if
|
|
* BPF_F_REPLACE is used
|
|
*/
|
|
};
|
|
|
|
struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
|
|
__u32 prog_fd;
|
|
__u32 retval;
|
|
__u32 data_size_in; /* input: len of data_in */
|
|
__u32 data_size_out; /* input/output: len of data_out
|
|
* returns ENOSPC if data_out
|
|
* is too small.
|
|
*/
|
|
__aligned_u64 data_in;
|
|
__aligned_u64 data_out;
|
|
__u32 repeat;
|
|
__u32 duration;
|
|
__u32 ctx_size_in; /* input: len of ctx_in */
|
|
__u32 ctx_size_out; /* input/output: len of ctx_out
|
|
* returns ENOSPC if ctx_out
|
|
* is too small.
|
|
*/
|
|
__aligned_u64 ctx_in;
|
|
__aligned_u64 ctx_out;
|
|
__u32 flags;
|
|
__u32 cpu;
|
|
__u32 batch_size;
|
|
} test;
|
|
|
|
struct { /* anonymous struct used by BPF_*_GET_*_ID */
|
|
union {
|
|
__u32 start_id;
|
|
__u32 prog_id;
|
|
__u32 map_id;
|
|
__u32 btf_id;
|
|
__u32 link_id;
|
|
};
|
|
__u32 next_id;
|
|
__u32 open_flags;
|
|
};
|
|
|
|
struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */
|
|
__u32 bpf_fd;
|
|
__u32 info_len;
|
|
__aligned_u64 info;
|
|
} info;
|
|
|
|
struct { /* anonymous struct used by BPF_PROG_QUERY command */
|
|
__u32 target_fd; /* container object to query */
|
|
__u32 attach_type;
|
|
__u32 query_flags;
|
|
__u32 attach_flags;
|
|
__aligned_u64 prog_ids;
|
|
__u32 prog_cnt;
|
|
/* output: per-program attach_flags.
|
|
* not allowed to be set during effective query.
|
|
*/
|
|
__aligned_u64 prog_attach_flags;
|
|
} query;
|
|
|
|
struct { /* anonymous struct used by BPF_RAW_TRACEPOINT_OPEN command */
|
|
__u64 name;
|
|
__u32 prog_fd;
|
|
} raw_tracepoint;
|
|
|
|
struct { /* anonymous struct for BPF_BTF_LOAD */
|
|
__aligned_u64 btf;
|
|
__aligned_u64 btf_log_buf;
|
|
__u32 btf_size;
|
|
__u32 btf_log_size;
|
|
__u32 btf_log_level;
|
|
/* output: actual total log contents size (including termintaing zero).
|
|
* It could be both larger than original log_size (if log was
|
|
* truncated), or smaller (if log buffer wasn't filled completely).
|
|
*/
|
|
__u32 btf_log_true_size;
|
|
};
|
|
|
|
struct {
|
|
__u32 pid; /* input: pid */
|
|
__u32 fd; /* input: fd */
|
|
__u32 flags; /* input: flags */
|
|
__u32 buf_len; /* input/output: buf len */
|
|
__aligned_u64 buf; /* input/output:
|
|
* tp_name for tracepoint
|
|
* symbol for kprobe
|
|
* filename for uprobe
|
|
*/
|
|
__u32 prog_id; /* output: prod_id */
|
|
__u32 fd_type; /* output: BPF_FD_TYPE_* */
|
|
__u64 probe_offset; /* output: probe_offset */
|
|
__u64 probe_addr; /* output: probe_addr */
|
|
} task_fd_query;
|
|
|
|
struct { /* struct used by BPF_LINK_CREATE command */
|
|
union {
|
|
__u32 prog_fd; /* eBPF program to attach */
|
|
__u32 map_fd; /* struct_ops to attach */
|
|
};
|
|
union {
|
|
__u32 target_fd; /* object to attach to */
|
|
__u32 target_ifindex; /* target ifindex */
|
|
};
|
|
__u32 attach_type; /* attach type */
|
|
__u32 flags; /* extra flags */
|
|
union {
|
|
__u32 target_btf_id; /* btf_id of target to attach to */
|
|
struct {
|
|
__aligned_u64 iter_info; /* extra bpf_iter_link_info */
|
|
__u32 iter_info_len; /* iter_info length */
|
|
};
|
|
struct {
|
|
/* black box user-provided value passed through
|
|
* to BPF program at the execution time and
|
|
* accessible through bpf_get_attach_cookie() BPF helper
|
|
*/
|
|
__u64 bpf_cookie;
|
|
} perf_event;
|
|
struct {
|
|
__u32 flags;
|
|
__u32 cnt;
|
|
__aligned_u64 syms;
|
|
__aligned_u64 addrs;
|
|
__aligned_u64 cookies;
|
|
} kprobe_multi;
|
|
struct {
|
|
/* this is overlaid with the target_btf_id above. */
|
|
__u32 target_btf_id;
|
|
/* black box user-provided value passed through
|
|
* to BPF program at the execution time and
|
|
* accessible through bpf_get_attach_cookie() BPF helper
|
|
*/
|
|
__u64 cookie;
|
|
} tracing;
|
|
struct {
|
|
__u32 pf;
|
|
__u32 hooknum;
|
|
__s32 priority;
|
|
__u32 flags;
|
|
} netfilter;
|
|
};
|
|
} link_create;
|
|
|
|
struct { /* struct used by BPF_LINK_UPDATE command */
|
|
__u32 link_fd; /* link fd */
|
|
union {
|
|
/* new program fd to update link with */
|
|
__u32 new_prog_fd;
|
|
/* new struct_ops map fd to update link with */
|
|
__u32 new_map_fd;
|
|
};
|
|
__u32 flags; /* extra flags */
|
|
union {
|
|
/* expected link's program fd; is specified only if
|
|
* BPF_F_REPLACE flag is set in flags.
|
|
*/
|
|
__u32 old_prog_fd;
|
|
/* expected link's map fd; is specified only
|
|
* if BPF_F_REPLACE flag is set.
|
|
*/
|
|
__u32 old_map_fd;
|
|
};
|
|
} link_update;
|
|
|
|
struct {
|
|
__u32 link_fd;
|
|
} link_detach;
|
|
|
|
struct { /* struct used by BPF_ENABLE_STATS command */
|
|
__u32 type;
|
|
} enable_stats;
|
|
|
|
struct { /* struct used by BPF_ITER_CREATE command */
|
|
__u32 link_fd;
|
|
__u32 flags;
|
|
} iter_create;
|
|
|
|
struct { /* struct used by BPF_PROG_BIND_MAP command */
|
|
__u32 prog_fd;
|
|
__u32 map_fd;
|
|
__u32 flags; /* extra flags */
|
|
} prog_bind_map;
|
|
|
|
} __attribute__((aligned(8)));
|
|
|
|
/* The description below is an attempt at providing documentation to eBPF
|
|
* developers about the multiple available eBPF helper functions. It can be
|
|
* parsed and used to produce a manual page. The workflow is the following,
|
|
* and requires the rst2man utility:
|
|
*
|
|
* $ ./scripts/bpf_doc.py \
|
|
* --filename include/uapi/linux/bpf.h > /tmp/bpf-helpers.rst
|
|
* $ rst2man /tmp/bpf-helpers.rst > /tmp/bpf-helpers.7
|
|
* $ man /tmp/bpf-helpers.7
|
|
*
|
|
* Note that in order to produce this external documentation, some RST
|
|
* formatting is used in the descriptions to get "bold" and "italics" in
|
|
* manual pages. Also note that the few trailing white spaces are
|
|
* intentional, removing them would break paragraphs for rst2man.
|
|
*
|
|
* Start of BPF helper function descriptions:
|
|
*
|
|
* void *bpf_map_lookup_elem(struct bpf_map *map, const void *key)
|
|
* Description
|
|
* Perform a lookup in *map* for an entry associated to *key*.
|
|
* Return
|
|
* Map value associated to *key*, or **NULL** if no entry was
|
|
* found.
|
|
*
|
|
* long bpf_map_update_elem(struct bpf_map *map, const void *key, const void *value, u64 flags)
|
|
* Description
|
|
* Add or update the value of the entry associated to *key* in
|
|
* *map* with *value*. *flags* is one of:
|
|
*
|
|
* **BPF_NOEXIST**
|
|
* The entry for *key* must not exist in the map.
|
|
* **BPF_EXIST**
|
|
* The entry for *key* must already exist in the map.
|
|
* **BPF_ANY**
|
|
* No condition on the existence of the entry for *key*.
|
|
*
|
|
* Flag value **BPF_NOEXIST** cannot be used for maps of types
|
|
* **BPF_MAP_TYPE_ARRAY** or **BPF_MAP_TYPE_PERCPU_ARRAY** (all
|
|
* elements always exist), the helper would return an error.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_map_delete_elem(struct bpf_map *map, const void *key)
|
|
* Description
|
|
* Delete entry with *key* from *map*.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_probe_read(void *dst, u32 size, const void *unsafe_ptr)
|
|
* Description
|
|
* For tracing programs, safely attempt to read *size* bytes from
|
|
* kernel space address *unsafe_ptr* and store the data in *dst*.
|
|
*
|
|
* Generally, use **bpf_probe_read_user**\ () or
|
|
* **bpf_probe_read_kernel**\ () instead.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* u64 bpf_ktime_get_ns(void)
|
|
* Description
|
|
* Return the time elapsed since system boot, in nanoseconds.
|
|
* Does not include time the system was suspended.
|
|
* See: **clock_gettime**\ (**CLOCK_MONOTONIC**)
|
|
* Return
|
|
* Current *ktime*.
|
|
*
|
|
* long bpf_trace_printk(const char *fmt, u32 fmt_size, ...)
|
|
* Description
|
|
* This helper is a "printk()-like" facility for debugging. It
|
|
* prints a message defined by format *fmt* (of size *fmt_size*)
|
|
* to file *\/sys/kernel/tracing/trace* from TraceFS, if
|
|
* available. It can take up to three additional **u64**
|
|
* arguments (as an eBPF helpers, the total number of arguments is
|
|
* limited to five).
|
|
*
|
|
* Each time the helper is called, it appends a line to the trace.
|
|
* Lines are discarded while *\/sys/kernel/tracing/trace* is
|
|
* open, use *\/sys/kernel/tracing/trace_pipe* to avoid this.
|
|
* The format of the trace is customizable, and the exact output
|
|
* one will get depends on the options set in
|
|
* *\/sys/kernel/tracing/trace_options* (see also the
|
|
* *README* file under the same directory). However, it usually
|
|
* defaults to something like:
|
|
*
|
|
* ::
|
|
*
|
|
* telnet-470 [001] .N.. 419421.045894: 0x00000001: <formatted msg>
|
|
*
|
|
* In the above:
|
|
*
|
|
* * ``telnet`` is the name of the current task.
|
|
* * ``470`` is the PID of the current task.
|
|
* * ``001`` is the CPU number on which the task is
|
|
* running.
|
|
* * In ``.N..``, each character refers to a set of
|
|
* options (whether irqs are enabled, scheduling
|
|
* options, whether hard/softirqs are running, level of
|
|
* preempt_disabled respectively). **N** means that
|
|
* **TIF_NEED_RESCHED** and **PREEMPT_NEED_RESCHED**
|
|
* are set.
|
|
* * ``419421.045894`` is a timestamp.
|
|
* * ``0x00000001`` is a fake value used by BPF for the
|
|
* instruction pointer register.
|
|
* * ``<formatted msg>`` is the message formatted with
|
|
* *fmt*.
|
|
*
|
|
* The conversion specifiers supported by *fmt* are similar, but
|
|
* more limited than for printk(). They are **%d**, **%i**,
|
|
* **%u**, **%x**, **%ld**, **%li**, **%lu**, **%lx**, **%lld**,
|
|
* **%lli**, **%llu**, **%llx**, **%p**, **%s**. No modifier (size
|
|
* of field, padding with zeroes, etc.) is available, and the
|
|
* helper will return **-EINVAL** (but print nothing) if it
|
|
* encounters an unknown specifier.
|
|
*
|
|
* Also, note that **bpf_trace_printk**\ () is slow, and should
|
|
* only be used for debugging purposes. For this reason, a notice
|
|
* block (spanning several lines) is printed to kernel logs and
|
|
* states that the helper should not be used "for production use"
|
|
* the first time this helper is used (or more precisely, when
|
|
* **trace_printk**\ () buffers are allocated). For passing values
|
|
* to user space, perf events should be preferred.
|
|
* Return
|
|
* The number of bytes written to the buffer, or a negative error
|
|
* in case of failure.
|
|
*
|
|
* u32 bpf_get_prandom_u32(void)
|
|
* Description
|
|
* Get a pseudo-random number.
|
|
*
|
|
* From a security point of view, this helper uses its own
|
|
* pseudo-random internal state, and cannot be used to infer the
|
|
* seed of other random functions in the kernel. However, it is
|
|
* essential to note that the generator used by the helper is not
|
|
* cryptographically secure.
|
|
* Return
|
|
* A random 32-bit unsigned value.
|
|
*
|
|
* u32 bpf_get_smp_processor_id(void)
|
|
* Description
|
|
* Get the SMP (symmetric multiprocessing) processor id. Note that
|
|
* all programs run with migration disabled, which means that the
|
|
* SMP processor id is stable during all the execution of the
|
|
* program.
|
|
* Return
|
|
* The SMP id of the processor running the program.
|
|
*
|
|
* long bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, const void *from, u32 len, u64 flags)
|
|
* Description
|
|
* Store *len* bytes from address *from* into the packet
|
|
* associated to *skb*, at *offset*. *flags* are a combination of
|
|
* **BPF_F_RECOMPUTE_CSUM** (automatically recompute the
|
|
* checksum for the packet after storing the bytes) and
|
|
* **BPF_F_INVALIDATE_HASH** (set *skb*\ **->hash**, *skb*\
|
|
* **->swhash** and *skb*\ **->l4hash** to 0).
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_l3_csum_replace(struct sk_buff *skb, u32 offset, u64 from, u64 to, u64 size)
|
|
* Description
|
|
* Recompute the layer 3 (e.g. IP) checksum for the packet
|
|
* associated to *skb*. Computation is incremental, so the helper
|
|
* must know the former value of the header field that was
|
|
* modified (*from*), the new value of this field (*to*), and the
|
|
* number of bytes (2 or 4) for this field, stored in *size*.
|
|
* Alternatively, it is possible to store the difference between
|
|
* the previous and the new values of the header field in *to*, by
|
|
* setting *from* and *size* to 0. For both methods, *offset*
|
|
* indicates the location of the IP checksum within the packet.
|
|
*
|
|
* This helper works in combination with **bpf_csum_diff**\ (),
|
|
* which does not update the checksum in-place, but offers more
|
|
* flexibility and can handle sizes larger than 2 or 4 for the
|
|
* checksum to update.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_l4_csum_replace(struct sk_buff *skb, u32 offset, u64 from, u64 to, u64 flags)
|
|
* Description
|
|
* Recompute the layer 4 (e.g. TCP, UDP or ICMP) checksum for the
|
|
* packet associated to *skb*. Computation is incremental, so the
|
|
* helper must know the former value of the header field that was
|
|
* modified (*from*), the new value of this field (*to*), and the
|
|
* number of bytes (2 or 4) for this field, stored on the lowest
|
|
* four bits of *flags*. Alternatively, it is possible to store
|
|
* the difference between the previous and the new values of the
|
|
* header field in *to*, by setting *from* and the four lowest
|
|
* bits of *flags* to 0. For both methods, *offset* indicates the
|
|
* location of the IP checksum within the packet. In addition to
|
|
* the size of the field, *flags* can be added (bitwise OR) actual
|
|
* flags. With **BPF_F_MARK_MANGLED_0**, a null checksum is left
|
|
* untouched (unless **BPF_F_MARK_ENFORCE** is added as well), and
|
|
* for updates resulting in a null checksum the value is set to
|
|
* **CSUM_MANGLED_0** instead. Flag **BPF_F_PSEUDO_HDR** indicates
|
|
* the checksum is to be computed against a pseudo-header.
|
|
*
|
|
* This helper works in combination with **bpf_csum_diff**\ (),
|
|
* which does not update the checksum in-place, but offers more
|
|
* flexibility and can handle sizes larger than 2 or 4 for the
|
|
* checksum to update.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_tail_call(void *ctx, struct bpf_map *prog_array_map, u32 index)
|
|
* Description
|
|
* This special helper is used to trigger a "tail call", or in
|
|
* other words, to jump into another eBPF program. The same stack
|
|
* frame is used (but values on stack and in registers for the
|
|
* caller are not accessible to the callee). This mechanism allows
|
|
* for program chaining, either for raising the maximum number of
|
|
* available eBPF instructions, or to execute given programs in
|
|
* conditional blocks. For security reasons, there is an upper
|
|
* limit to the number of successive tail calls that can be
|
|
* performed.
|
|
*
|
|
* Upon call of this helper, the program attempts to jump into a
|
|
* program referenced at index *index* in *prog_array_map*, a
|
|
* special map of type **BPF_MAP_TYPE_PROG_ARRAY**, and passes
|
|
* *ctx*, a pointer to the context.
|
|
*
|
|
* If the call succeeds, the kernel immediately runs the first
|
|
* instruction of the new program. This is not a function call,
|
|
* and it never returns to the previous program. If the call
|
|
* fails, then the helper has no effect, and the caller continues
|
|
* to run its subsequent instructions. A call can fail if the
|
|
* destination program for the jump does not exist (i.e. *index*
|
|
* is superior to the number of entries in *prog_array_map*), or
|
|
* if the maximum number of tail calls has been reached for this
|
|
* chain of programs. This limit is defined in the kernel by the
|
|
* macro **MAX_TAIL_CALL_CNT** (not accessible to user space),
|
|
* which is currently set to 33.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_clone_redirect(struct sk_buff *skb, u32 ifindex, u64 flags)
|
|
* Description
|
|
* Clone and redirect the packet associated to *skb* to another
|
|
* net device of index *ifindex*. Both ingress and egress
|
|
* interfaces can be used for redirection. The **BPF_F_INGRESS**
|
|
* value in *flags* is used to make the distinction (ingress path
|
|
* is selected if the flag is present, egress path otherwise).
|
|
* This is the only flag supported for now.
|
|
*
|
|
* In comparison with **bpf_redirect**\ () helper,
|
|
* **bpf_clone_redirect**\ () has the associated cost of
|
|
* duplicating the packet buffer, but this can be executed out of
|
|
* the eBPF program. Conversely, **bpf_redirect**\ () is more
|
|
* efficient, but it is handled through an action code where the
|
|
* redirection happens only after the eBPF program has returned.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* u64 bpf_get_current_pid_tgid(void)
|
|
* Description
|
|
* Get the current pid and tgid.
|
|
* Return
|
|
* A 64-bit integer containing the current tgid and pid, and
|
|
* created as such:
|
|
* *current_task*\ **->tgid << 32 \|**
|
|
* *current_task*\ **->pid**.
|
|
*
|
|
* u64 bpf_get_current_uid_gid(void)
|
|
* Description
|
|
* Get the current uid and gid.
|
|
* Return
|
|
* A 64-bit integer containing the current GID and UID, and
|
|
* created as such: *current_gid* **<< 32 \|** *current_uid*.
|
|
*
|
|
* long bpf_get_current_comm(void *buf, u32 size_of_buf)
|
|
* Description
|
|
* Copy the **comm** attribute of the current task into *buf* of
|
|
* *size_of_buf*. The **comm** attribute contains the name of
|
|
* the executable (excluding the path) for the current task. The
|
|
* *size_of_buf* must be strictly positive. On success, the
|
|
* helper makes sure that the *buf* is NUL-terminated. On failure,
|
|
* it is filled with zeroes.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* u32 bpf_get_cgroup_classid(struct sk_buff *skb)
|
|
* Description
|
|
* Retrieve the classid for the current task, i.e. for the net_cls
|
|
* cgroup to which *skb* belongs.
|
|
*
|
|
* This helper can be used on TC egress path, but not on ingress.
|
|
*
|
|
* The net_cls cgroup provides an interface to tag network packets
|
|
* based on a user-provided identifier for all traffic coming from
|
|
* the tasks belonging to the related cgroup. See also the related
|
|
* kernel documentation, available from the Linux sources in file
|
|
* *Documentation/admin-guide/cgroup-v1/net_cls.rst*.
|
|
*
|
|
* The Linux kernel has two versions for cgroups: there are
|
|
* cgroups v1 and cgroups v2. Both are available to users, who can
|
|
* use a mixture of them, but note that the net_cls cgroup is for
|
|
* cgroup v1 only. This makes it incompatible with BPF programs
|
|
* run on cgroups, which is a cgroup-v2-only feature (a socket can
|
|
* only hold data for one version of cgroups at a time).
|
|
*
|
|
* This helper is only available is the kernel was compiled with
|
|
* the **CONFIG_CGROUP_NET_CLASSID** configuration option set to
|
|
* "**y**" or to "**m**".
|
|
* Return
|
|
* The classid, or 0 for the default unconfigured classid.
|
|
*
|
|
* long bpf_skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci)
|
|
* Description
|
|
* Push a *vlan_tci* (VLAN tag control information) of protocol
|
|
* *vlan_proto* to the packet associated to *skb*, then update
|
|
* the checksum. Note that if *vlan_proto* is different from
|
|
* **ETH_P_8021Q** and **ETH_P_8021AD**, it is considered to
|
|
* be **ETH_P_8021Q**.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_vlan_pop(struct sk_buff *skb)
|
|
* Description
|
|
* Pop a VLAN header from the packet associated to *skb*.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_get_tunnel_key(struct sk_buff *skb, struct bpf_tunnel_key *key, u32 size, u64 flags)
|
|
* Description
|
|
* Get tunnel metadata. This helper takes a pointer *key* to an
|
|
* empty **struct bpf_tunnel_key** of **size**, that will be
|
|
* filled with tunnel metadata for the packet associated to *skb*.
|
|
* The *flags* can be set to **BPF_F_TUNINFO_IPV6**, which
|
|
* indicates that the tunnel is based on IPv6 protocol instead of
|
|
* IPv4.
|
|
*
|
|
* The **struct bpf_tunnel_key** is an object that generalizes the
|
|
* principal parameters used by various tunneling protocols into a
|
|
* single struct. This way, it can be used to easily make a
|
|
* decision based on the contents of the encapsulation header,
|
|
* "summarized" in this struct. In particular, it holds the IP
|
|
* address of the remote end (IPv4 or IPv6, depending on the case)
|
|
* in *key*\ **->remote_ipv4** or *key*\ **->remote_ipv6**. Also,
|
|
* this struct exposes the *key*\ **->tunnel_id**, which is
|
|
* generally mapped to a VNI (Virtual Network Identifier), making
|
|
* it programmable together with the **bpf_skb_set_tunnel_key**\
|
|
* () helper.
|
|
*
|
|
* Let's imagine that the following code is part of a program
|
|
* attached to the TC ingress interface, on one end of a GRE
|
|
* tunnel, and is supposed to filter out all messages coming from
|
|
* remote ends with IPv4 address other than 10.0.0.1:
|
|
*
|
|
* ::
|
|
*
|
|
* int ret;
|
|
* struct bpf_tunnel_key key = {};
|
|
*
|
|
* ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
|
|
* if (ret < 0)
|
|
* return TC_ACT_SHOT; // drop packet
|
|
*
|
|
* if (key.remote_ipv4 != 0x0a000001)
|
|
* return TC_ACT_SHOT; // drop packet
|
|
*
|
|
* return TC_ACT_OK; // accept packet
|
|
*
|
|
* This interface can also be used with all encapsulation devices
|
|
* that can operate in "collect metadata" mode: instead of having
|
|
* one network device per specific configuration, the "collect
|
|
* metadata" mode only requires a single device where the
|
|
* configuration can be extracted from this helper.
|
|
*
|
|
* This can be used together with various tunnels such as VXLan,
|
|
* Geneve, GRE or IP in IP (IPIP).
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_set_tunnel_key(struct sk_buff *skb, struct bpf_tunnel_key *key, u32 size, u64 flags)
|
|
* Description
|
|
* Populate tunnel metadata for packet associated to *skb.* The
|
|
* tunnel metadata is set to the contents of *key*, of *size*. The
|
|
* *flags* can be set to a combination of the following values:
|
|
*
|
|
* **BPF_F_TUNINFO_IPV6**
|
|
* Indicate that the tunnel is based on IPv6 protocol
|
|
* instead of IPv4.
|
|
* **BPF_F_ZERO_CSUM_TX**
|
|
* For IPv4 packets, add a flag to tunnel metadata
|
|
* indicating that checksum computation should be skipped
|
|
* and checksum set to zeroes.
|
|
* **BPF_F_DONT_FRAGMENT**
|
|
* Add a flag to tunnel metadata indicating that the
|
|
* packet should not be fragmented.
|
|
* **BPF_F_SEQ_NUMBER**
|
|
* Add a flag to tunnel metadata indicating that a
|
|
* sequence number should be added to tunnel header before
|
|
* sending the packet. This flag was added for GRE
|
|
* encapsulation, but might be used with other protocols
|
|
* as well in the future.
|
|
* **BPF_F_NO_TUNNEL_KEY**
|
|
* Add a flag to tunnel metadata indicating that no tunnel
|
|
* key should be set in the resulting tunnel header.
|
|
*
|
|
* Here is a typical usage on the transmit path:
|
|
*
|
|
* ::
|
|
*
|
|
* struct bpf_tunnel_key key;
|
|
* populate key ...
|
|
* bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0);
|
|
* bpf_clone_redirect(skb, vxlan_dev_ifindex, 0);
|
|
*
|
|
* See also the description of the **bpf_skb_get_tunnel_key**\ ()
|
|
* helper for additional information.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* u64 bpf_perf_event_read(struct bpf_map *map, u64 flags)
|
|
* Description
|
|
* Read the value of a perf event counter. This helper relies on a
|
|
* *map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. The nature of
|
|
* the perf event counter is selected when *map* is updated with
|
|
* perf event file descriptors. The *map* is an array whose size
|
|
* is the number of available CPUs, and each cell contains a value
|
|
* relative to one CPU. The value to retrieve is indicated by
|
|
* *flags*, that contains the index of the CPU to look up, masked
|
|
* with **BPF_F_INDEX_MASK**. Alternatively, *flags* can be set to
|
|
* **BPF_F_CURRENT_CPU** to indicate that the value for the
|
|
* current CPU should be retrieved.
|
|
*
|
|
* Note that before Linux 4.13, only hardware perf event can be
|
|
* retrieved.
|
|
*
|
|
* Also, be aware that the newer helper
|
|
* **bpf_perf_event_read_value**\ () is recommended over
|
|
* **bpf_perf_event_read**\ () in general. The latter has some ABI
|
|
* quirks where error and counter value are used as a return code
|
|
* (which is wrong to do since ranges may overlap). This issue is
|
|
* fixed with **bpf_perf_event_read_value**\ (), which at the same
|
|
* time provides more features over the **bpf_perf_event_read**\
|
|
* () interface. Please refer to the description of
|
|
* **bpf_perf_event_read_value**\ () for details.
|
|
* Return
|
|
* The value of the perf event counter read from the map, or a
|
|
* negative error code in case of failure.
|
|
*
|
|
* long bpf_redirect(u32 ifindex, u64 flags)
|
|
* Description
|
|
* Redirect the packet to another net device of index *ifindex*.
|
|
* This helper is somewhat similar to **bpf_clone_redirect**\
|
|
* (), except that the packet is not cloned, which provides
|
|
* increased performance.
|
|
*
|
|
* Except for XDP, both ingress and egress interfaces can be used
|
|
* for redirection. The **BPF_F_INGRESS** value in *flags* is used
|
|
* to make the distinction (ingress path is selected if the flag
|
|
* is present, egress path otherwise). Currently, XDP only
|
|
* supports redirection to the egress interface, and accepts no
|
|
* flag at all.
|
|
*
|
|
* The same effect can also be attained with the more generic
|
|
* **bpf_redirect_map**\ (), which uses a BPF map to store the
|
|
* redirect target instead of providing it directly to the helper.
|
|
* Return
|
|
* For XDP, the helper returns **XDP_REDIRECT** on success or
|
|
* **XDP_ABORTED** on error. For other program types, the values
|
|
* are **TC_ACT_REDIRECT** on success or **TC_ACT_SHOT** on
|
|
* error.
|
|
*
|
|
* u32 bpf_get_route_realm(struct sk_buff *skb)
|
|
* Description
|
|
* Retrieve the realm or the route, that is to say the
|
|
* **tclassid** field of the destination for the *skb*. The
|
|
* identifier retrieved is a user-provided tag, similar to the
|
|
* one used with the net_cls cgroup (see description for
|
|
* **bpf_get_cgroup_classid**\ () helper), but here this tag is
|
|
* held by a route (a destination entry), not by a task.
|
|
*
|
|
* Retrieving this identifier works with the clsact TC egress hook
|
|
* (see also **tc-bpf(8)**), or alternatively on conventional
|
|
* classful egress qdiscs, but not on TC ingress path. In case of
|
|
* clsact TC egress hook, this has the advantage that, internally,
|
|
* the destination entry has not been dropped yet in the transmit
|
|
* path. Therefore, the destination entry does not need to be
|
|
* artificially held via **netif_keep_dst**\ () for a classful
|
|
* qdisc until the *skb* is freed.
|
|
*
|
|
* This helper is available only if the kernel was compiled with
|
|
* **CONFIG_IP_ROUTE_CLASSID** configuration option.
|
|
* Return
|
|
* The realm of the route for the packet associated to *skb*, or 0
|
|
* if none was found.
|
|
*
|
|
* long bpf_perf_event_output(void *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
|
|
* Description
|
|
* Write raw *data* blob into a special BPF perf event held by
|
|
* *map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
|
|
* event must have the following attributes: **PERF_SAMPLE_RAW**
|
|
* as **sample_type**, **PERF_TYPE_SOFTWARE** as **type**, and
|
|
* **PERF_COUNT_SW_BPF_OUTPUT** as **config**.
|
|
*
|
|
* The *flags* are used to indicate the index in *map* for which
|
|
* the value must be put, masked with **BPF_F_INDEX_MASK**.
|
|
* Alternatively, *flags* can be set to **BPF_F_CURRENT_CPU**
|
|
* to indicate that the index of the current CPU core should be
|
|
* used.
|
|
*
|
|
* The value to write, of *size*, is passed through eBPF stack and
|
|
* pointed by *data*.
|
|
*
|
|
* The context of the program *ctx* needs also be passed to the
|
|
* helper.
|
|
*
|
|
* On user space, a program willing to read the values needs to
|
|
* call **perf_event_open**\ () on the perf event (either for
|
|
* one or for all CPUs) and to store the file descriptor into the
|
|
* *map*. This must be done before the eBPF program can send data
|
|
* into it. An example is available in file
|
|
* *samples/bpf/trace_output_user.c* in the Linux kernel source
|
|
* tree (the eBPF program counterpart is in
|
|
* *samples/bpf/trace_output_kern.c*).
|
|
*
|
|
* **bpf_perf_event_output**\ () achieves better performance
|
|
* than **bpf_trace_printk**\ () for sharing data with user
|
|
* space, and is much better suitable for streaming data from eBPF
|
|
* programs.
|
|
*
|
|
* Note that this helper is not restricted to tracing use cases
|
|
* and can be used with programs attached to TC or XDP as well,
|
|
* where it allows for passing data to user space listeners. Data
|
|
* can be:
|
|
*
|
|
* * Only custom structs,
|
|
* * Only the packet payload, or
|
|
* * A combination of both.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_load_bytes(const void *skb, u32 offset, void *to, u32 len)
|
|
* Description
|
|
* This helper was provided as an easy way to load data from a
|
|
* packet. It can be used to load *len* bytes from *offset* from
|
|
* the packet associated to *skb*, into the buffer pointed by
|
|
* *to*.
|
|
*
|
|
* Since Linux 4.7, usage of this helper has mostly been replaced
|
|
* by "direct packet access", enabling packet data to be
|
|
* manipulated with *skb*\ **->data** and *skb*\ **->data_end**
|
|
* pointing respectively to the first byte of packet data and to
|
|
* the byte after the last byte of packet data. However, it
|
|
* remains useful if one wishes to read large quantities of data
|
|
* at once from a packet into the eBPF stack.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_get_stackid(void *ctx, struct bpf_map *map, u64 flags)
|
|
* Description
|
|
* Walk a user or a kernel stack and return its id. To achieve
|
|
* this, the helper needs *ctx*, which is a pointer to the context
|
|
* on which the tracing program is executed, and a pointer to a
|
|
* *map* of type **BPF_MAP_TYPE_STACK_TRACE**.
|
|
*
|
|
* The last argument, *flags*, holds the number of stack frames to
|
|
* skip (from 0 to 255), masked with
|
|
* **BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set
|
|
* a combination of the following flags:
|
|
*
|
|
* **BPF_F_USER_STACK**
|
|
* Collect a user space stack instead of a kernel stack.
|
|
* **BPF_F_FAST_STACK_CMP**
|
|
* Compare stacks by hash only.
|
|
* **BPF_F_REUSE_STACKID**
|
|
* If two different stacks hash into the same *stackid*,
|
|
* discard the old one.
|
|
*
|
|
* The stack id retrieved is a 32 bit long integer handle which
|
|
* can be further combined with other data (including other stack
|
|
* ids) and used as a key into maps. This can be useful for
|
|
* generating a variety of graphs (such as flame graphs or off-cpu
|
|
* graphs).
|
|
*
|
|
* For walking a stack, this helper is an improvement over
|
|
* **bpf_probe_read**\ (), which can be used with unrolled loops
|
|
* but is not efficient and consumes a lot of eBPF instructions.
|
|
* Instead, **bpf_get_stackid**\ () can collect up to
|
|
* **PERF_MAX_STACK_DEPTH** both kernel and user frames. Note that
|
|
* this limit can be controlled with the **sysctl** program, and
|
|
* that it should be manually increased in order to profile long
|
|
* user stacks (such as stacks for Java programs). To do so, use:
|
|
*
|
|
* ::
|
|
*
|
|
* # sysctl kernel.perf_event_max_stack=<new value>
|
|
* Return
|
|
* The positive or null stack id on success, or a negative error
|
|
* in case of failure.
|
|
*
|
|
* s64 bpf_csum_diff(__be32 *from, u32 from_size, __be32 *to, u32 to_size, __wsum seed)
|
|
* Description
|
|
* Compute a checksum difference, from the raw buffer pointed by
|
|
* *from*, of length *from_size* (that must be a multiple of 4),
|
|
* towards the raw buffer pointed by *to*, of size *to_size*
|
|
* (same remark). An optional *seed* can be added to the value
|
|
* (this can be cascaded, the seed may come from a previous call
|
|
* to the helper).
|
|
*
|
|
* This is flexible enough to be used in several ways:
|
|
*
|
|
* * With *from_size* == 0, *to_size* > 0 and *seed* set to
|
|
* checksum, it can be used when pushing new data.
|
|
* * With *from_size* > 0, *to_size* == 0 and *seed* set to
|
|
* checksum, it can be used when removing data from a packet.
|
|
* * With *from_size* > 0, *to_size* > 0 and *seed* set to 0, it
|
|
* can be used to compute a diff. Note that *from_size* and
|
|
* *to_size* do not need to be equal.
|
|
*
|
|
* This helper can be used in combination with
|
|
* **bpf_l3_csum_replace**\ () and **bpf_l4_csum_replace**\ (), to
|
|
* which one can feed in the difference computed with
|
|
* **bpf_csum_diff**\ ().
|
|
* Return
|
|
* The checksum result, or a negative error code in case of
|
|
* failure.
|
|
*
|
|
* long bpf_skb_get_tunnel_opt(struct sk_buff *skb, void *opt, u32 size)
|
|
* Description
|
|
* Retrieve tunnel options metadata for the packet associated to
|
|
* *skb*, and store the raw tunnel option data to the buffer *opt*
|
|
* of *size*.
|
|
*
|
|
* This helper can be used with encapsulation devices that can
|
|
* operate in "collect metadata" mode (please refer to the related
|
|
* note in the description of **bpf_skb_get_tunnel_key**\ () for
|
|
* more details). A particular example where this can be used is
|
|
* in combination with the Geneve encapsulation protocol, where it
|
|
* allows for pushing (with **bpf_skb_get_tunnel_opt**\ () helper)
|
|
* and retrieving arbitrary TLVs (Type-Length-Value headers) from
|
|
* the eBPF program. This allows for full customization of these
|
|
* headers.
|
|
* Return
|
|
* The size of the option data retrieved.
|
|
*
|
|
* long bpf_skb_set_tunnel_opt(struct sk_buff *skb, void *opt, u32 size)
|
|
* Description
|
|
* Set tunnel options metadata for the packet associated to *skb*
|
|
* to the option data contained in the raw buffer *opt* of *size*.
|
|
*
|
|
* See also the description of the **bpf_skb_get_tunnel_opt**\ ()
|
|
* helper for additional information.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_change_proto(struct sk_buff *skb, __be16 proto, u64 flags)
|
|
* Description
|
|
* Change the protocol of the *skb* to *proto*. Currently
|
|
* supported are transition from IPv4 to IPv6, and from IPv6 to
|
|
* IPv4. The helper takes care of the groundwork for the
|
|
* transition, including resizing the socket buffer. The eBPF
|
|
* program is expected to fill the new headers, if any, via
|
|
* **skb_store_bytes**\ () and to recompute the checksums with
|
|
* **bpf_l3_csum_replace**\ () and **bpf_l4_csum_replace**\
|
|
* (). The main case for this helper is to perform NAT64
|
|
* operations out of an eBPF program.
|
|
*
|
|
* Internally, the GSO type is marked as dodgy so that headers are
|
|
* checked and segments are recalculated by the GSO/GRO engine.
|
|
* The size for GSO target is adapted as well.
|
|
*
|
|
* All values for *flags* are reserved for future usage, and must
|
|
* be left at zero.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_change_type(struct sk_buff *skb, u32 type)
|
|
* Description
|
|
* Change the packet type for the packet associated to *skb*. This
|
|
* comes down to setting *skb*\ **->pkt_type** to *type*, except
|
|
* the eBPF program does not have a write access to *skb*\
|
|
* **->pkt_type** beside this helper. Using a helper here allows
|
|
* for graceful handling of errors.
|
|
*
|
|
* The major use case is to change incoming *skb*s to
|
|
* **PACKET_HOST** in a programmatic way instead of having to
|
|
* recirculate via **redirect**\ (..., **BPF_F_INGRESS**), for
|
|
* example.
|
|
*
|
|
* Note that *type* only allows certain values. At this time, they
|
|
* are:
|
|
*
|
|
* **PACKET_HOST**
|
|
* Packet is for us.
|
|
* **PACKET_BROADCAST**
|
|
* Send packet to all.
|
|
* **PACKET_MULTICAST**
|
|
* Send packet to group.
|
|
* **PACKET_OTHERHOST**
|
|
* Send packet to someone else.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_under_cgroup(struct sk_buff *skb, struct bpf_map *map, u32 index)
|
|
* Description
|
|
* Check whether *skb* is a descendant of the cgroup2 held by
|
|
* *map* of type **BPF_MAP_TYPE_CGROUP_ARRAY**, at *index*.
|
|
* Return
|
|
* The return value depends on the result of the test, and can be:
|
|
*
|
|
* * 0, if the *skb* failed the cgroup2 descendant test.
|
|
* * 1, if the *skb* succeeded the cgroup2 descendant test.
|
|
* * A negative error code, if an error occurred.
|
|
*
|
|
* u32 bpf_get_hash_recalc(struct sk_buff *skb)
|
|
* Description
|
|
* Retrieve the hash of the packet, *skb*\ **->hash**. If it is
|
|
* not set, in particular if the hash was cleared due to mangling,
|
|
* recompute this hash. Later accesses to the hash can be done
|
|
* directly with *skb*\ **->hash**.
|
|
*
|
|
* Calling **bpf_set_hash_invalid**\ (), changing a packet
|
|
* prototype with **bpf_skb_change_proto**\ (), or calling
|
|
* **bpf_skb_store_bytes**\ () with the
|
|
* **BPF_F_INVALIDATE_HASH** are actions susceptible to clear
|
|
* the hash and to trigger a new computation for the next call to
|
|
* **bpf_get_hash_recalc**\ ().
|
|
* Return
|
|
* The 32-bit hash.
|
|
*
|
|
* u64 bpf_get_current_task(void)
|
|
* Description
|
|
* Get the current task.
|
|
* Return
|
|
* A pointer to the current task struct.
|
|
*
|
|
* long bpf_probe_write_user(void *dst, const void *src, u32 len)
|
|
* Description
|
|
* Attempt in a safe way to write *len* bytes from the buffer
|
|
* *src* to *dst* in memory. It only works for threads that are in
|
|
* user context, and *dst* must be a valid user space address.
|
|
*
|
|
* This helper should not be used to implement any kind of
|
|
* security mechanism because of TOC-TOU attacks, but rather to
|
|
* debug, divert, and manipulate execution of semi-cooperative
|
|
* processes.
|
|
*
|
|
* Keep in mind that this feature is meant for experiments, and it
|
|
* has a risk of crashing the system and running programs.
|
|
* Therefore, when an eBPF program using this helper is attached,
|
|
* a warning including PID and process name is printed to kernel
|
|
* logs.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_current_task_under_cgroup(struct bpf_map *map, u32 index)
|
|
* Description
|
|
* Check whether the probe is being run is the context of a given
|
|
* subset of the cgroup2 hierarchy. The cgroup2 to test is held by
|
|
* *map* of type **BPF_MAP_TYPE_CGROUP_ARRAY**, at *index*.
|
|
* Return
|
|
* The return value depends on the result of the test, and can be:
|
|
*
|
|
* * 1, if current task belongs to the cgroup2.
|
|
* * 0, if current task does not belong to the cgroup2.
|
|
* * A negative error code, if an error occurred.
|
|
*
|
|
* long bpf_skb_change_tail(struct sk_buff *skb, u32 len, u64 flags)
|
|
* Description
|
|
* Resize (trim or grow) the packet associated to *skb* to the
|
|
* new *len*. The *flags* are reserved for future usage, and must
|
|
* be left at zero.
|
|
*
|
|
* The basic idea is that the helper performs the needed work to
|
|
* change the size of the packet, then the eBPF program rewrites
|
|
* the rest via helpers like **bpf_skb_store_bytes**\ (),
|
|
* **bpf_l3_csum_replace**\ (), **bpf_l3_csum_replace**\ ()
|
|
* and others. This helper is a slow path utility intended for
|
|
* replies with control messages. And because it is targeted for
|
|
* slow path, the helper itself can afford to be slow: it
|
|
* implicitly linearizes, unclones and drops offloads from the
|
|
* *skb*.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_pull_data(struct sk_buff *skb, u32 len)
|
|
* Description
|
|
* Pull in non-linear data in case the *skb* is non-linear and not
|
|
* all of *len* are part of the linear section. Make *len* bytes
|
|
* from *skb* readable and writable. If a zero value is passed for
|
|
* *len*, then all bytes in the linear part of *skb* will be made
|
|
* readable and writable.
|
|
*
|
|
* This helper is only needed for reading and writing with direct
|
|
* packet access.
|
|
*
|
|
* For direct packet access, testing that offsets to access
|
|
* are within packet boundaries (test on *skb*\ **->data_end**) is
|
|
* susceptible to fail if offsets are invalid, or if the requested
|
|
* data is in non-linear parts of the *skb*. On failure the
|
|
* program can just bail out, or in the case of a non-linear
|
|
* buffer, use a helper to make the data available. The
|
|
* **bpf_skb_load_bytes**\ () helper is a first solution to access
|
|
* the data. Another one consists in using **bpf_skb_pull_data**
|
|
* to pull in once the non-linear parts, then retesting and
|
|
* eventually access the data.
|
|
*
|
|
* At the same time, this also makes sure the *skb* is uncloned,
|
|
* which is a necessary condition for direct write. As this needs
|
|
* to be an invariant for the write part only, the verifier
|
|
* detects writes and adds a prologue that is calling
|
|
* **bpf_skb_pull_data()** to effectively unclone the *skb* from
|
|
* the very beginning in case it is indeed cloned.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* s64 bpf_csum_update(struct sk_buff *skb, __wsum csum)
|
|
* Description
|
|
* Add the checksum *csum* into *skb*\ **->csum** in case the
|
|
* driver has supplied a checksum for the entire packet into that
|
|
* field. Return an error otherwise. This helper is intended to be
|
|
* used in combination with **bpf_csum_diff**\ (), in particular
|
|
* when the checksum needs to be updated after data has been
|
|
* written into the packet through direct packet access.
|
|
* Return
|
|
* The checksum on success, or a negative error code in case of
|
|
* failure.
|
|
*
|
|
* void bpf_set_hash_invalid(struct sk_buff *skb)
|
|
* Description
|
|
* Invalidate the current *skb*\ **->hash**. It can be used after
|
|
* mangling on headers through direct packet access, in order to
|
|
* indicate that the hash is outdated and to trigger a
|
|
* recalculation the next time the kernel tries to access this
|
|
* hash or when the **bpf_get_hash_recalc**\ () helper is called.
|
|
* Return
|
|
* void.
|
|
*
|
|
* long bpf_get_numa_node_id(void)
|
|
* Description
|
|
* Return the id of the current NUMA node. The primary use case
|
|
* for this helper is the selection of sockets for the local NUMA
|
|
* node, when the program is attached to sockets using the
|
|
* **SO_ATTACH_REUSEPORT_EBPF** option (see also **socket(7)**),
|
|
* but the helper is also available to other eBPF program types,
|
|
* similarly to **bpf_get_smp_processor_id**\ ().
|
|
* Return
|
|
* The id of current NUMA node.
|
|
*
|
|
* long bpf_skb_change_head(struct sk_buff *skb, u32 len, u64 flags)
|
|
* Description
|
|
* Grows headroom of packet associated to *skb* and adjusts the
|
|
* offset of the MAC header accordingly, adding *len* bytes of
|
|
* space. It automatically extends and reallocates memory as
|
|
* required.
|
|
*
|
|
* This helper can be used on a layer 3 *skb* to push a MAC header
|
|
* for redirection into a layer 2 device.
|
|
*
|
|
* All values for *flags* are reserved for future usage, and must
|
|
* be left at zero.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_xdp_adjust_head(struct xdp_buff *xdp_md, int delta)
|
|
* Description
|
|
* Adjust (move) *xdp_md*\ **->data** by *delta* bytes. Note that
|
|
* it is possible to use a negative value for *delta*. This helper
|
|
* can be used to prepare the packet for pushing or popping
|
|
* headers.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_probe_read_str(void *dst, u32 size, const void *unsafe_ptr)
|
|
* Description
|
|
* Copy a NUL terminated string from an unsafe kernel address
|
|
* *unsafe_ptr* to *dst*. See **bpf_probe_read_kernel_str**\ () for
|
|
* more details.
|
|
*
|
|
* Generally, use **bpf_probe_read_user_str**\ () or
|
|
* **bpf_probe_read_kernel_str**\ () instead.
|
|
* Return
|
|
* On success, the strictly positive length of the string,
|
|
* including the trailing NUL character. On error, a negative
|
|
* value.
|
|
*
|
|
* u64 bpf_get_socket_cookie(struct sk_buff *skb)
|
|
* Description
|
|
* If the **struct sk_buff** pointed by *skb* has a known socket,
|
|
* retrieve the cookie (generated by the kernel) of this socket.
|
|
* If no cookie has been set yet, generate a new cookie. Once
|
|
* generated, the socket cookie remains stable for the life of the
|
|
* socket. This helper can be useful for monitoring per socket
|
|
* networking traffic statistics as it provides a global socket
|
|
* identifier that can be assumed unique.
|
|
* Return
|
|
* A 8-byte long unique number on success, or 0 if the socket
|
|
* field is missing inside *skb*.
|
|
*
|
|
* u64 bpf_get_socket_cookie(struct bpf_sock_addr *ctx)
|
|
* Description
|
|
* Equivalent to bpf_get_socket_cookie() helper that accepts
|
|
* *skb*, but gets socket from **struct bpf_sock_addr** context.
|
|
* Return
|
|
* A 8-byte long unique number.
|
|
*
|
|
* u64 bpf_get_socket_cookie(struct bpf_sock_ops *ctx)
|
|
* Description
|
|
* Equivalent to **bpf_get_socket_cookie**\ () helper that accepts
|
|
* *skb*, but gets socket from **struct bpf_sock_ops** context.
|
|
* Return
|
|
* A 8-byte long unique number.
|
|
*
|
|
* u64 bpf_get_socket_cookie(struct sock *sk)
|
|
* Description
|
|
* Equivalent to **bpf_get_socket_cookie**\ () helper that accepts
|
|
* *sk*, but gets socket from a BTF **struct sock**. This helper
|
|
* also works for sleepable programs.
|
|
* Return
|
|
* A 8-byte long unique number or 0 if *sk* is NULL.
|
|
*
|
|
* u32 bpf_get_socket_uid(struct sk_buff *skb)
|
|
* Description
|
|
* Get the owner UID of the socked associated to *skb*.
|
|
* Return
|
|
* The owner UID of the socket associated to *skb*. If the socket
|
|
* is **NULL**, or if it is not a full socket (i.e. if it is a
|
|
* time-wait or a request socket instead), **overflowuid** value
|
|
* is returned (note that **overflowuid** might also be the actual
|
|
* UID value for the socket).
|
|
*
|
|
* long bpf_set_hash(struct sk_buff *skb, u32 hash)
|
|
* Description
|
|
* Set the full hash for *skb* (set the field *skb*\ **->hash**)
|
|
* to value *hash*.
|
|
* Return
|
|
* 0
|
|
*
|
|
* long bpf_setsockopt(void *bpf_socket, int level, int optname, void *optval, int optlen)
|
|
* Description
|
|
* Emulate a call to **setsockopt()** on the socket associated to
|
|
* *bpf_socket*, which must be a full socket. The *level* at
|
|
* which the option resides and the name *optname* of the option
|
|
* must be specified, see **setsockopt(2)** for more information.
|
|
* The option value of length *optlen* is pointed by *optval*.
|
|
*
|
|
* *bpf_socket* should be one of the following:
|
|
*
|
|
* * **struct bpf_sock_ops** for **BPF_PROG_TYPE_SOCK_OPS**.
|
|
* * **struct bpf_sock_addr** for **BPF_CGROUP_INET4_CONNECT**
|
|
* and **BPF_CGROUP_INET6_CONNECT**.
|
|
*
|
|
* This helper actually implements a subset of **setsockopt()**.
|
|
* It supports the following *level*\ s:
|
|
*
|
|
* * **SOL_SOCKET**, which supports the following *optname*\ s:
|
|
* **SO_RCVBUF**, **SO_SNDBUF**, **SO_MAX_PACING_RATE**,
|
|
* **SO_PRIORITY**, **SO_RCVLOWAT**, **SO_MARK**,
|
|
* **SO_BINDTODEVICE**, **SO_KEEPALIVE**, **SO_REUSEADDR**,
|
|
* **SO_REUSEPORT**, **SO_BINDTOIFINDEX**, **SO_TXREHASH**.
|
|
* * **IPPROTO_TCP**, which supports the following *optname*\ s:
|
|
* **TCP_CONGESTION**, **TCP_BPF_IW**,
|
|
* **TCP_BPF_SNDCWND_CLAMP**, **TCP_SAVE_SYN**,
|
|
* **TCP_KEEPIDLE**, **TCP_KEEPINTVL**, **TCP_KEEPCNT**,
|
|
* **TCP_SYNCNT**, **TCP_USER_TIMEOUT**, **TCP_NOTSENT_LOWAT**,
|
|
* **TCP_NODELAY**, **TCP_MAXSEG**, **TCP_WINDOW_CLAMP**,
|
|
* **TCP_THIN_LINEAR_TIMEOUTS**, **TCP_BPF_DELACK_MAX**,
|
|
* **TCP_BPF_RTO_MIN**.
|
|
* * **IPPROTO_IP**, which supports *optname* **IP_TOS**.
|
|
* * **IPPROTO_IPV6**, which supports the following *optname*\ s:
|
|
* **IPV6_TCLASS**, **IPV6_AUTOFLOWLABEL**.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_adjust_room(struct sk_buff *skb, s32 len_diff, u32 mode, u64 flags)
|
|
* Description
|
|
* Grow or shrink the room for data in the packet associated to
|
|
* *skb* by *len_diff*, and according to the selected *mode*.
|
|
*
|
|
* By default, the helper will reset any offloaded checksum
|
|
* indicator of the skb to CHECKSUM_NONE. This can be avoided
|
|
* by the following flag:
|
|
*
|
|
* * **BPF_F_ADJ_ROOM_NO_CSUM_RESET**: Do not reset offloaded
|
|
* checksum data of the skb to CHECKSUM_NONE.
|
|
*
|
|
* There are two supported modes at this time:
|
|
*
|
|
* * **BPF_ADJ_ROOM_MAC**: Adjust room at the mac layer
|
|
* (room space is added or removed between the layer 2 and
|
|
* layer 3 headers).
|
|
*
|
|
* * **BPF_ADJ_ROOM_NET**: Adjust room at the network layer
|
|
* (room space is added or removed between the layer 3 and
|
|
* layer 4 headers).
|
|
*
|
|
* The following flags are supported at this time:
|
|
*
|
|
* * **BPF_F_ADJ_ROOM_FIXED_GSO**: Do not adjust gso_size.
|
|
* Adjusting mss in this way is not allowed for datagrams.
|
|
*
|
|
* * **BPF_F_ADJ_ROOM_ENCAP_L3_IPV4**,
|
|
* **BPF_F_ADJ_ROOM_ENCAP_L3_IPV6**:
|
|
* Any new space is reserved to hold a tunnel header.
|
|
* Configure skb offsets and other fields accordingly.
|
|
*
|
|
* * **BPF_F_ADJ_ROOM_ENCAP_L4_GRE**,
|
|
* **BPF_F_ADJ_ROOM_ENCAP_L4_UDP**:
|
|
* Use with ENCAP_L3 flags to further specify the tunnel type.
|
|
*
|
|
* * **BPF_F_ADJ_ROOM_ENCAP_L2**\ (*len*):
|
|
* Use with ENCAP_L3/L4 flags to further specify the tunnel
|
|
* type; *len* is the length of the inner MAC header.
|
|
*
|
|
* * **BPF_F_ADJ_ROOM_ENCAP_L2_ETH**:
|
|
* Use with BPF_F_ADJ_ROOM_ENCAP_L2 flag to further specify the
|
|
* L2 type as Ethernet.
|
|
*
|
|
* * **BPF_F_ADJ_ROOM_DECAP_L3_IPV4**,
|
|
* **BPF_F_ADJ_ROOM_DECAP_L3_IPV6**:
|
|
* Indicate the new IP header version after decapsulating the outer
|
|
* IP header. Used when the inner and outer IP versions are different.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_redirect_map(struct bpf_map *map, u64 key, u64 flags)
|
|
* Description
|
|
* Redirect the packet to the endpoint referenced by *map* at
|
|
* index *key*. Depending on its type, this *map* can contain
|
|
* references to net devices (for forwarding packets through other
|
|
* ports), or to CPUs (for redirecting XDP frames to another CPU;
|
|
* but this is only implemented for native XDP (with driver
|
|
* support) as of this writing).
|
|
*
|
|
* The lower two bits of *flags* are used as the return code if
|
|
* the map lookup fails. This is so that the return value can be
|
|
* one of the XDP program return codes up to **XDP_TX**, as chosen
|
|
* by the caller. The higher bits of *flags* can be set to
|
|
* BPF_F_BROADCAST or BPF_F_EXCLUDE_INGRESS as defined below.
|
|
*
|
|
* With BPF_F_BROADCAST the packet will be broadcasted to all the
|
|
* interfaces in the map, with BPF_F_EXCLUDE_INGRESS the ingress
|
|
* interface will be excluded when do broadcasting.
|
|
*
|
|
* See also **bpf_redirect**\ (), which only supports redirecting
|
|
* to an ifindex, but doesn't require a map to do so.
|
|
* Return
|
|
* **XDP_REDIRECT** on success, or the value of the two lower bits
|
|
* of the *flags* argument on error.
|
|
*
|
|
* long bpf_sk_redirect_map(struct sk_buff *skb, struct bpf_map *map, u32 key, u64 flags)
|
|
* Description
|
|
* Redirect the packet to the socket referenced by *map* (of type
|
|
* **BPF_MAP_TYPE_SOCKMAP**) at index *key*. Both ingress and
|
|
* egress interfaces can be used for redirection. The
|
|
* **BPF_F_INGRESS** value in *flags* is used to make the
|
|
* distinction (ingress path is selected if the flag is present,
|
|
* egress path otherwise). This is the only flag supported for now.
|
|
* Return
|
|
* **SK_PASS** on success, or **SK_DROP** on error.
|
|
*
|
|
* long bpf_sock_map_update(struct bpf_sock_ops *skops, struct bpf_map *map, void *key, u64 flags)
|
|
* Description
|
|
* Add an entry to, or update a *map* referencing sockets. The
|
|
* *skops* is used as a new value for the entry associated to
|
|
* *key*. *flags* is one of:
|
|
*
|
|
* **BPF_NOEXIST**
|
|
* The entry for *key* must not exist in the map.
|
|
* **BPF_EXIST**
|
|
* The entry for *key* must already exist in the map.
|
|
* **BPF_ANY**
|
|
* No condition on the existence of the entry for *key*.
|
|
*
|
|
* If the *map* has eBPF programs (parser and verdict), those will
|
|
* be inherited by the socket being added. If the socket is
|
|
* already attached to eBPF programs, this results in an error.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_xdp_adjust_meta(struct xdp_buff *xdp_md, int delta)
|
|
* Description
|
|
* Adjust the address pointed by *xdp_md*\ **->data_meta** by
|
|
* *delta* (which can be positive or negative). Note that this
|
|
* operation modifies the address stored in *xdp_md*\ **->data**,
|
|
* so the latter must be loaded only after the helper has been
|
|
* called.
|
|
*
|
|
* The use of *xdp_md*\ **->data_meta** is optional and programs
|
|
* are not required to use it. The rationale is that when the
|
|
* packet is processed with XDP (e.g. as DoS filter), it is
|
|
* possible to push further meta data along with it before passing
|
|
* to the stack, and to give the guarantee that an ingress eBPF
|
|
* program attached as a TC classifier on the same device can pick
|
|
* this up for further post-processing. Since TC works with socket
|
|
* buffers, it remains possible to set from XDP the **mark** or
|
|
* **priority** pointers, or other pointers for the socket buffer.
|
|
* Having this scratch space generic and programmable allows for
|
|
* more flexibility as the user is free to store whatever meta
|
|
* data they need.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_perf_event_read_value(struct bpf_map *map, u64 flags, struct bpf_perf_event_value *buf, u32 buf_size)
|
|
* Description
|
|
* Read the value of a perf event counter, and store it into *buf*
|
|
* of size *buf_size*. This helper relies on a *map* of type
|
|
* **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. The nature of the perf event
|
|
* counter is selected when *map* is updated with perf event file
|
|
* descriptors. The *map* is an array whose size is the number of
|
|
* available CPUs, and each cell contains a value relative to one
|
|
* CPU. The value to retrieve is indicated by *flags*, that
|
|
* contains the index of the CPU to look up, masked with
|
|
* **BPF_F_INDEX_MASK**. Alternatively, *flags* can be set to
|
|
* **BPF_F_CURRENT_CPU** to indicate that the value for the
|
|
* current CPU should be retrieved.
|
|
*
|
|
* This helper behaves in a way close to
|
|
* **bpf_perf_event_read**\ () helper, save that instead of
|
|
* just returning the value observed, it fills the *buf*
|
|
* structure. This allows for additional data to be retrieved: in
|
|
* particular, the enabled and running times (in *buf*\
|
|
* **->enabled** and *buf*\ **->running**, respectively) are
|
|
* copied. In general, **bpf_perf_event_read_value**\ () is
|
|
* recommended over **bpf_perf_event_read**\ (), which has some
|
|
* ABI issues and provides fewer functionalities.
|
|
*
|
|
* These values are interesting, because hardware PMU (Performance
|
|
* Monitoring Unit) counters are limited resources. When there are
|
|
* more PMU based perf events opened than available counters,
|
|
* kernel will multiplex these events so each event gets certain
|
|
* percentage (but not all) of the PMU time. In case that
|
|
* multiplexing happens, the number of samples or counter value
|
|
* will not reflect the case compared to when no multiplexing
|
|
* occurs. This makes comparison between different runs difficult.
|
|
* Typically, the counter value should be normalized before
|
|
* comparing to other experiments. The usual normalization is done
|
|
* as follows.
|
|
*
|
|
* ::
|
|
*
|
|
* normalized_counter = counter * t_enabled / t_running
|
|
*
|
|
* Where t_enabled is the time enabled for event and t_running is
|
|
* the time running for event since last normalization. The
|
|
* enabled and running times are accumulated since the perf event
|
|
* open. To achieve scaling factor between two invocations of an
|
|
* eBPF program, users can use CPU id as the key (which is
|
|
* typical for perf array usage model) to remember the previous
|
|
* value and do the calculation inside the eBPF program.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_perf_prog_read_value(struct bpf_perf_event_data *ctx, struct bpf_perf_event_value *buf, u32 buf_size)
|
|
* Description
|
|
* For an eBPF program attached to a perf event, retrieve the
|
|
* value of the event counter associated to *ctx* and store it in
|
|
* the structure pointed by *buf* and of size *buf_size*. Enabled
|
|
* and running times are also stored in the structure (see
|
|
* description of helper **bpf_perf_event_read_value**\ () for
|
|
* more details).
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_getsockopt(void *bpf_socket, int level, int optname, void *optval, int optlen)
|
|
* Description
|
|
* Emulate a call to **getsockopt()** on the socket associated to
|
|
* *bpf_socket*, which must be a full socket. The *level* at
|
|
* which the option resides and the name *optname* of the option
|
|
* must be specified, see **getsockopt(2)** for more information.
|
|
* The retrieved value is stored in the structure pointed by
|
|
* *opval* and of length *optlen*.
|
|
*
|
|
* *bpf_socket* should be one of the following:
|
|
*
|
|
* * **struct bpf_sock_ops** for **BPF_PROG_TYPE_SOCK_OPS**.
|
|
* * **struct bpf_sock_addr** for **BPF_CGROUP_INET4_CONNECT**
|
|
* and **BPF_CGROUP_INET6_CONNECT**.
|
|
*
|
|
* This helper actually implements a subset of **getsockopt()**.
|
|
* It supports the same set of *optname*\ s that is supported by
|
|
* the **bpf_setsockopt**\ () helper. The exceptions are
|
|
* **TCP_BPF_*** is **bpf_setsockopt**\ () only and
|
|
* **TCP_SAVED_SYN** is **bpf_getsockopt**\ () only.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_override_return(struct pt_regs *regs, u64 rc)
|
|
* Description
|
|
* Used for error injection, this helper uses kprobes to override
|
|
* the return value of the probed function, and to set it to *rc*.
|
|
* The first argument is the context *regs* on which the kprobe
|
|
* works.
|
|
*
|
|
* This helper works by setting the PC (program counter)
|
|
* to an override function which is run in place of the original
|
|
* probed function. This means the probed function is not run at
|
|
* all. The replacement function just returns with the required
|
|
* value.
|
|
*
|
|
* This helper has security implications, and thus is subject to
|
|
* restrictions. It is only available if the kernel was compiled
|
|
* with the **CONFIG_BPF_KPROBE_OVERRIDE** configuration
|
|
* option, and in this case it only works on functions tagged with
|
|
* **ALLOW_ERROR_INJECTION** in the kernel code.
|
|
*
|
|
* Also, the helper is only available for the architectures having
|
|
* the CONFIG_FUNCTION_ERROR_INJECTION option. As of this writing,
|
|
* x86 architecture is the only one to support this feature.
|
|
* Return
|
|
* 0
|
|
*
|
|
* long bpf_sock_ops_cb_flags_set(struct bpf_sock_ops *bpf_sock, int argval)
|
|
* Description
|
|
* Attempt to set the value of the **bpf_sock_ops_cb_flags** field
|
|
* for the full TCP socket associated to *bpf_sock_ops* to
|
|
* *argval*.
|
|
*
|
|
* The primary use of this field is to determine if there should
|
|
* be calls to eBPF programs of type
|
|
* **BPF_PROG_TYPE_SOCK_OPS** at various points in the TCP
|
|
* code. A program of the same type can change its value, per
|
|
* connection and as necessary, when the connection is
|
|
* established. This field is directly accessible for reading, but
|
|
* this helper must be used for updates in order to return an
|
|
* error if an eBPF program tries to set a callback that is not
|
|
* supported in the current kernel.
|
|
*
|
|
* *argval* is a flag array which can combine these flags:
|
|
*
|
|
* * **BPF_SOCK_OPS_RTO_CB_FLAG** (retransmission time out)
|
|
* * **BPF_SOCK_OPS_RETRANS_CB_FLAG** (retransmission)
|
|
* * **BPF_SOCK_OPS_STATE_CB_FLAG** (TCP state change)
|
|
* * **BPF_SOCK_OPS_RTT_CB_FLAG** (every RTT)
|
|
*
|
|
* Therefore, this function can be used to clear a callback flag by
|
|
* setting the appropriate bit to zero. e.g. to disable the RTO
|
|
* callback:
|
|
*
|
|
* **bpf_sock_ops_cb_flags_set(bpf_sock,**
|
|
* **bpf_sock->bpf_sock_ops_cb_flags & ~BPF_SOCK_OPS_RTO_CB_FLAG)**
|
|
*
|
|
* Here are some examples of where one could call such eBPF
|
|
* program:
|
|
*
|
|
* * When RTO fires.
|
|
* * When a packet is retransmitted.
|
|
* * When the connection terminates.
|
|
* * When a packet is sent.
|
|
* * When a packet is received.
|
|
* Return
|
|
* Code **-EINVAL** if the socket is not a full TCP socket;
|
|
* otherwise, a positive number containing the bits that could not
|
|
* be set is returned (which comes down to 0 if all bits were set
|
|
* as required).
|
|
*
|
|
* long bpf_msg_redirect_map(struct sk_msg_buff *msg, struct bpf_map *map, u32 key, u64 flags)
|
|
* Description
|
|
* This helper is used in programs implementing policies at the
|
|
* socket level. If the message *msg* is allowed to pass (i.e. if
|
|
* the verdict eBPF program returns **SK_PASS**), redirect it to
|
|
* the socket referenced by *map* (of type
|
|
* **BPF_MAP_TYPE_SOCKMAP**) at index *key*. Both ingress and
|
|
* egress interfaces can be used for redirection. The
|
|
* **BPF_F_INGRESS** value in *flags* is used to make the
|
|
* distinction (ingress path is selected if the flag is present,
|
|
* egress path otherwise). This is the only flag supported for now.
|
|
* Return
|
|
* **SK_PASS** on success, or **SK_DROP** on error.
|
|
*
|
|
* long bpf_msg_apply_bytes(struct sk_msg_buff *msg, u32 bytes)
|
|
* Description
|
|
* For socket policies, apply the verdict of the eBPF program to
|
|
* the next *bytes* (number of bytes) of message *msg*.
|
|
*
|
|
* For example, this helper can be used in the following cases:
|
|
*
|
|
* * A single **sendmsg**\ () or **sendfile**\ () system call
|
|
* contains multiple logical messages that the eBPF program is
|
|
* supposed to read and for which it should apply a verdict.
|
|
* * An eBPF program only cares to read the first *bytes* of a
|
|
* *msg*. If the message has a large payload, then setting up
|
|
* and calling the eBPF program repeatedly for all bytes, even
|
|
* though the verdict is already known, would create unnecessary
|
|
* overhead.
|
|
*
|
|
* When called from within an eBPF program, the helper sets a
|
|
* counter internal to the BPF infrastructure, that is used to
|
|
* apply the last verdict to the next *bytes*. If *bytes* is
|
|
* smaller than the current data being processed from a
|
|
* **sendmsg**\ () or **sendfile**\ () system call, the first
|
|
* *bytes* will be sent and the eBPF program will be re-run with
|
|
* the pointer for start of data pointing to byte number *bytes*
|
|
* **+ 1**. If *bytes* is larger than the current data being
|
|
* processed, then the eBPF verdict will be applied to multiple
|
|
* **sendmsg**\ () or **sendfile**\ () calls until *bytes* are
|
|
* consumed.
|
|
*
|
|
* Note that if a socket closes with the internal counter holding
|
|
* a non-zero value, this is not a problem because data is not
|
|
* being buffered for *bytes* and is sent as it is received.
|
|
* Return
|
|
* 0
|
|
*
|
|
* long bpf_msg_cork_bytes(struct sk_msg_buff *msg, u32 bytes)
|
|
* Description
|
|
* For socket policies, prevent the execution of the verdict eBPF
|
|
* program for message *msg* until *bytes* (byte number) have been
|
|
* accumulated.
|
|
*
|
|
* This can be used when one needs a specific number of bytes
|
|
* before a verdict can be assigned, even if the data spans
|
|
* multiple **sendmsg**\ () or **sendfile**\ () calls. The extreme
|
|
* case would be a user calling **sendmsg**\ () repeatedly with
|
|
* 1-byte long message segments. Obviously, this is bad for
|
|
* performance, but it is still valid. If the eBPF program needs
|
|
* *bytes* bytes to validate a header, this helper can be used to
|
|
* prevent the eBPF program to be called again until *bytes* have
|
|
* been accumulated.
|
|
* Return
|
|
* 0
|
|
*
|
|
* long bpf_msg_pull_data(struct sk_msg_buff *msg, u32 start, u32 end, u64 flags)
|
|
* Description
|
|
* For socket policies, pull in non-linear data from user space
|
|
* for *msg* and set pointers *msg*\ **->data** and *msg*\
|
|
* **->data_end** to *start* and *end* bytes offsets into *msg*,
|
|
* respectively.
|
|
*
|
|
* If a program of type **BPF_PROG_TYPE_SK_MSG** is run on a
|
|
* *msg* it can only parse data that the (**data**, **data_end**)
|
|
* pointers have already consumed. For **sendmsg**\ () hooks this
|
|
* is likely the first scatterlist element. But for calls relying
|
|
* on the **sendpage** handler (e.g. **sendfile**\ ()) this will
|
|
* be the range (**0**, **0**) because the data is shared with
|
|
* user space and by default the objective is to avoid allowing
|
|
* user space to modify data while (or after) eBPF verdict is
|
|
* being decided. This helper can be used to pull in data and to
|
|
* set the start and end pointer to given values. Data will be
|
|
* copied if necessary (i.e. if data was not linear and if start
|
|
* and end pointers do not point to the same chunk).
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
*
|
|
* All values for *flags* are reserved for future usage, and must
|
|
* be left at zero.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_bind(struct bpf_sock_addr *ctx, struct sockaddr *addr, int addr_len)
|
|
* Description
|
|
* Bind the socket associated to *ctx* to the address pointed by
|
|
* *addr*, of length *addr_len*. This allows for making outgoing
|
|
* connection from the desired IP address, which can be useful for
|
|
* example when all processes inside a cgroup should use one
|
|
* single IP address on a host that has multiple IP configured.
|
|
*
|
|
* This helper works for IPv4 and IPv6, TCP and UDP sockets. The
|
|
* domain (*addr*\ **->sa_family**) must be **AF_INET** (or
|
|
* **AF_INET6**). It's advised to pass zero port (**sin_port**
|
|
* or **sin6_port**) which triggers IP_BIND_ADDRESS_NO_PORT-like
|
|
* behavior and lets the kernel efficiently pick up an unused
|
|
* port as long as 4-tuple is unique. Passing non-zero port might
|
|
* lead to degraded performance.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_xdp_adjust_tail(struct xdp_buff *xdp_md, int delta)
|
|
* Description
|
|
* Adjust (move) *xdp_md*\ **->data_end** by *delta* bytes. It is
|
|
* possible to both shrink and grow the packet tail.
|
|
* Shrink done via *delta* being a negative integer.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_get_xfrm_state(struct sk_buff *skb, u32 index, struct bpf_xfrm_state *xfrm_state, u32 size, u64 flags)
|
|
* Description
|
|
* Retrieve the XFRM state (IP transform framework, see also
|
|
* **ip-xfrm(8)**) at *index* in XFRM "security path" for *skb*.
|
|
*
|
|
* The retrieved value is stored in the **struct bpf_xfrm_state**
|
|
* pointed by *xfrm_state* and of length *size*.
|
|
*
|
|
* All values for *flags* are reserved for future usage, and must
|
|
* be left at zero.
|
|
*
|
|
* This helper is available only if the kernel was compiled with
|
|
* **CONFIG_XFRM** configuration option.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_get_stack(void *ctx, void *buf, u32 size, u64 flags)
|
|
* Description
|
|
* Return a user or a kernel stack in bpf program provided buffer.
|
|
* To achieve this, the helper needs *ctx*, which is a pointer
|
|
* to the context on which the tracing program is executed.
|
|
* To store the stacktrace, the bpf program provides *buf* with
|
|
* a nonnegative *size*.
|
|
*
|
|
* The last argument, *flags*, holds the number of stack frames to
|
|
* skip (from 0 to 255), masked with
|
|
* **BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set
|
|
* the following flags:
|
|
*
|
|
* **BPF_F_USER_STACK**
|
|
* Collect a user space stack instead of a kernel stack.
|
|
* **BPF_F_USER_BUILD_ID**
|
|
* Collect (build_id, file_offset) instead of ips for user
|
|
* stack, only valid if **BPF_F_USER_STACK** is also
|
|
* specified.
|
|
*
|
|
* *file_offset* is an offset relative to the beginning
|
|
* of the executable or shared object file backing the vma
|
|
* which the *ip* falls in. It is *not* an offset relative
|
|
* to that object's base address. Accordingly, it must be
|
|
* adjusted by adding (sh_addr - sh_offset), where
|
|
* sh_{addr,offset} correspond to the executable section
|
|
* containing *file_offset* in the object, for comparisons
|
|
* to symbols' st_value to be valid.
|
|
*
|
|
* **bpf_get_stack**\ () can collect up to
|
|
* **PERF_MAX_STACK_DEPTH** both kernel and user frames, subject
|
|
* to sufficient large buffer size. Note that
|
|
* this limit can be controlled with the **sysctl** program, and
|
|
* that it should be manually increased in order to profile long
|
|
* user stacks (such as stacks for Java programs). To do so, use:
|
|
*
|
|
* ::
|
|
*
|
|
* # sysctl kernel.perf_event_max_stack=<new value>
|
|
* Return
|
|
* The non-negative copied *buf* length equal to or less than
|
|
* *size* on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_skb_load_bytes_relative(const void *skb, u32 offset, void *to, u32 len, u32 start_header)
|
|
* Description
|
|
* This helper is similar to **bpf_skb_load_bytes**\ () in that
|
|
* it provides an easy way to load *len* bytes from *offset*
|
|
* from the packet associated to *skb*, into the buffer pointed
|
|
* by *to*. The difference to **bpf_skb_load_bytes**\ () is that
|
|
* a fifth argument *start_header* exists in order to select a
|
|
* base offset to start from. *start_header* can be one of:
|
|
*
|
|
* **BPF_HDR_START_MAC**
|
|
* Base offset to load data from is *skb*'s mac header.
|
|
* **BPF_HDR_START_NET**
|
|
* Base offset to load data from is *skb*'s network header.
|
|
*
|
|
* In general, "direct packet access" is the preferred method to
|
|
* access packet data, however, this helper is in particular useful
|
|
* in socket filters where *skb*\ **->data** does not always point
|
|
* to the start of the mac header and where "direct packet access"
|
|
* is not available.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_fib_lookup(void *ctx, struct bpf_fib_lookup *params, int plen, u32 flags)
|
|
* Description
|
|
* Do FIB lookup in kernel tables using parameters in *params*.
|
|
* If lookup is successful and result shows packet is to be
|
|
* forwarded, the neighbor tables are searched for the nexthop.
|
|
* If successful (ie., FIB lookup shows forwarding and nexthop
|
|
* is resolved), the nexthop address is returned in ipv4_dst
|
|
* or ipv6_dst based on family, smac is set to mac address of
|
|
* egress device, dmac is set to nexthop mac address, rt_metric
|
|
* is set to metric from route (IPv4/IPv6 only), and ifindex
|
|
* is set to the device index of the nexthop from the FIB lookup.
|
|
*
|
|
* *plen* argument is the size of the passed in struct.
|
|
* *flags* argument can be a combination of one or more of the
|
|
* following values:
|
|
*
|
|
* **BPF_FIB_LOOKUP_DIRECT**
|
|
* Do a direct table lookup vs full lookup using FIB
|
|
* rules.
|
|
* **BPF_FIB_LOOKUP_OUTPUT**
|
|
* Perform lookup from an egress perspective (default is
|
|
* ingress).
|
|
* **BPF_FIB_LOOKUP_SKIP_NEIGH**
|
|
* Skip the neighbour table lookup. *params*->dmac
|
|
* and *params*->smac will not be set as output. A common
|
|
* use case is to call **bpf_redirect_neigh**\ () after
|
|
* doing **bpf_fib_lookup**\ ().
|
|
*
|
|
* *ctx* is either **struct xdp_md** for XDP programs or
|
|
* **struct sk_buff** tc cls_act programs.
|
|
* Return
|
|
* * < 0 if any input argument is invalid
|
|
* * 0 on success (packet is forwarded, nexthop neighbor exists)
|
|
* * > 0 one of **BPF_FIB_LKUP_RET_** codes explaining why the
|
|
* packet is not forwarded or needs assist from full stack
|
|
*
|
|
* If lookup fails with BPF_FIB_LKUP_RET_FRAG_NEEDED, then the MTU
|
|
* was exceeded and output params->mtu_result contains the MTU.
|
|
*
|
|
* long bpf_sock_hash_update(struct bpf_sock_ops *skops, struct bpf_map *map, void *key, u64 flags)
|
|
* Description
|
|
* Add an entry to, or update a sockhash *map* referencing sockets.
|
|
* The *skops* is used as a new value for the entry associated to
|
|
* *key*. *flags* is one of:
|
|
*
|
|
* **BPF_NOEXIST**
|
|
* The entry for *key* must not exist in the map.
|
|
* **BPF_EXIST**
|
|
* The entry for *key* must already exist in the map.
|
|
* **BPF_ANY**
|
|
* No condition on the existence of the entry for *key*.
|
|
*
|
|
* If the *map* has eBPF programs (parser and verdict), those will
|
|
* be inherited by the socket being added. If the socket is
|
|
* already attached to eBPF programs, this results in an error.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_msg_redirect_hash(struct sk_msg_buff *msg, struct bpf_map *map, void *key, u64 flags)
|
|
* Description
|
|
* This helper is used in programs implementing policies at the
|
|
* socket level. If the message *msg* is allowed to pass (i.e. if
|
|
* the verdict eBPF program returns **SK_PASS**), redirect it to
|
|
* the socket referenced by *map* (of type
|
|
* **BPF_MAP_TYPE_SOCKHASH**) using hash *key*. Both ingress and
|
|
* egress interfaces can be used for redirection. The
|
|
* **BPF_F_INGRESS** value in *flags* is used to make the
|
|
* distinction (ingress path is selected if the flag is present,
|
|
* egress path otherwise). This is the only flag supported for now.
|
|
* Return
|
|
* **SK_PASS** on success, or **SK_DROP** on error.
|
|
*
|
|
* long bpf_sk_redirect_hash(struct sk_buff *skb, struct bpf_map *map, void *key, u64 flags)
|
|
* Description
|
|
* This helper is used in programs implementing policies at the
|
|
* skb socket level. If the sk_buff *skb* is allowed to pass (i.e.
|
|
* if the verdict eBPF program returns **SK_PASS**), redirect it
|
|
* to the socket referenced by *map* (of type
|
|
* **BPF_MAP_TYPE_SOCKHASH**) using hash *key*. Both ingress and
|
|
* egress interfaces can be used for redirection. The
|
|
* **BPF_F_INGRESS** value in *flags* is used to make the
|
|
* distinction (ingress path is selected if the flag is present,
|
|
* egress otherwise). This is the only flag supported for now.
|
|
* Return
|
|
* **SK_PASS** on success, or **SK_DROP** on error.
|
|
*
|
|
* long bpf_lwt_push_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
|
|
* Description
|
|
* Encapsulate the packet associated to *skb* within a Layer 3
|
|
* protocol header. This header is provided in the buffer at
|
|
* address *hdr*, with *len* its size in bytes. *type* indicates
|
|
* the protocol of the header and can be one of:
|
|
*
|
|
* **BPF_LWT_ENCAP_SEG6**
|
|
* IPv6 encapsulation with Segment Routing Header
|
|
* (**struct ipv6_sr_hdr**). *hdr* only contains the SRH,
|
|
* the IPv6 header is computed by the kernel.
|
|
* **BPF_LWT_ENCAP_SEG6_INLINE**
|
|
* Only works if *skb* contains an IPv6 packet. Insert a
|
|
* Segment Routing Header (**struct ipv6_sr_hdr**) inside
|
|
* the IPv6 header.
|
|
* **BPF_LWT_ENCAP_IP**
|
|
* IP encapsulation (GRE/GUE/IPIP/etc). The outer header
|
|
* must be IPv4 or IPv6, followed by zero or more
|
|
* additional headers, up to **LWT_BPF_MAX_HEADROOM**
|
|
* total bytes in all prepended headers. Please note that
|
|
* if **skb_is_gso**\ (*skb*) is true, no more than two
|
|
* headers can be prepended, and the inner header, if
|
|
* present, should be either GRE or UDP/GUE.
|
|
*
|
|
* **BPF_LWT_ENCAP_SEG6**\ \* types can be called by BPF programs
|
|
* of type **BPF_PROG_TYPE_LWT_IN**; **BPF_LWT_ENCAP_IP** type can
|
|
* be called by bpf programs of types **BPF_PROG_TYPE_LWT_IN** and
|
|
* **BPF_PROG_TYPE_LWT_XMIT**.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_lwt_seg6_store_bytes(struct sk_buff *skb, u32 offset, const void *from, u32 len)
|
|
* Description
|
|
* Store *len* bytes from address *from* into the packet
|
|
* associated to *skb*, at *offset*. Only the flags, tag and TLVs
|
|
* inside the outermost IPv6 Segment Routing Header can be
|
|
* modified through this helper.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_lwt_seg6_adjust_srh(struct sk_buff *skb, u32 offset, s32 delta)
|
|
* Description
|
|
* Adjust the size allocated to TLVs in the outermost IPv6
|
|
* Segment Routing Header contained in the packet associated to
|
|
* *skb*, at position *offset* by *delta* bytes. Only offsets
|
|
* after the segments are accepted. *delta* can be as well
|
|
* positive (growing) as negative (shrinking).
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_lwt_seg6_action(struct sk_buff *skb, u32 action, void *param, u32 param_len)
|
|
* Description
|
|
* Apply an IPv6 Segment Routing action of type *action* to the
|
|
* packet associated to *skb*. Each action takes a parameter
|
|
* contained at address *param*, and of length *param_len* bytes.
|
|
* *action* can be one of:
|
|
*
|
|
* **SEG6_LOCAL_ACTION_END_X**
|
|
* End.X action: Endpoint with Layer-3 cross-connect.
|
|
* Type of *param*: **struct in6_addr**.
|
|
* **SEG6_LOCAL_ACTION_END_T**
|
|
* End.T action: Endpoint with specific IPv6 table lookup.
|
|
* Type of *param*: **int**.
|
|
* **SEG6_LOCAL_ACTION_END_B6**
|
|
* End.B6 action: Endpoint bound to an SRv6 policy.
|
|
* Type of *param*: **struct ipv6_sr_hdr**.
|
|
* **SEG6_LOCAL_ACTION_END_B6_ENCAP**
|
|
* End.B6.Encap action: Endpoint bound to an SRv6
|
|
* encapsulation policy.
|
|
* Type of *param*: **struct ipv6_sr_hdr**.
|
|
*
|
|
* A call to this helper is susceptible to change the underlying
|
|
* packet buffer. Therefore, at load time, all checks on pointers
|
|
* previously done by the verifier are invalidated and must be
|
|
* performed again, if the helper is used in combination with
|
|
* direct packet access.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_rc_repeat(void *ctx)
|
|
* Description
|
|
* This helper is used in programs implementing IR decoding, to
|
|
* report a successfully decoded repeat key message. This delays
|
|
* the generation of a key up event for previously generated
|
|
* key down event.
|
|
*
|
|
* Some IR protocols like NEC have a special IR message for
|
|
* repeating last button, for when a button is held down.
|
|
*
|
|
* The *ctx* should point to the lirc sample as passed into
|
|
* the program.
|
|
*
|
|
* This helper is only available is the kernel was compiled with
|
|
* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
|
|
* "**y**".
|
|
* Return
|
|
* 0
|
|
*
|
|
* long bpf_rc_keydown(void *ctx, u32 protocol, u64 scancode, u32 toggle)
|
|
* Description
|
|
* This helper is used in programs implementing IR decoding, to
|
|
* report a successfully decoded key press with *scancode*,
|
|
* *toggle* value in the given *protocol*. The scancode will be
|
|
* translated to a keycode using the rc keymap, and reported as
|
|
* an input key down event. After a period a key up event is
|
|
* generated. This period can be extended by calling either
|
|
* **bpf_rc_keydown**\ () again with the same values, or calling
|
|
* **bpf_rc_repeat**\ ().
|
|
*
|
|
* Some protocols include a toggle bit, in case the button was
|
|
* released and pressed again between consecutive scancodes.
|
|
*
|
|
* The *ctx* should point to the lirc sample as passed into
|
|
* the program.
|
|
*
|
|
* The *protocol* is the decoded protocol number (see
|
|
* **enum rc_proto** for some predefined values).
|
|
*
|
|
* This helper is only available is the kernel was compiled with
|
|
* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
|
|
* "**y**".
|
|
* Return
|
|
* 0
|
|
*
|
|
* u64 bpf_skb_cgroup_id(struct sk_buff *skb)
|
|
* Description
|
|
* Return the cgroup v2 id of the socket associated with the *skb*.
|
|
* This is roughly similar to the **bpf_get_cgroup_classid**\ ()
|
|
* helper for cgroup v1 by providing a tag resp. identifier that
|
|
* can be matched on or used for map lookups e.g. to implement
|
|
* policy. The cgroup v2 id of a given path in the hierarchy is
|
|
* exposed in user space through the f_handle API in order to get
|
|
* to the same 64-bit id.
|
|
*
|
|
* This helper can be used on TC egress path, but not on ingress,
|
|
* and is available only if the kernel was compiled with the
|
|
* **CONFIG_SOCK_CGROUP_DATA** configuration option.
|
|
* Return
|
|
* The id is returned or 0 in case the id could not be retrieved.
|
|
*
|
|
* u64 bpf_get_current_cgroup_id(void)
|
|
* Description
|
|
* Get the current cgroup id based on the cgroup within which
|
|
* the current task is running.
|
|
* Return
|
|
* A 64-bit integer containing the current cgroup id based
|
|
* on the cgroup within which the current task is running.
|
|
*
|
|
* void *bpf_get_local_storage(void *map, u64 flags)
|
|
* Description
|
|
* Get the pointer to the local storage area.
|
|
* The type and the size of the local storage is defined
|
|
* by the *map* argument.
|
|
* The *flags* meaning is specific for each map type,
|
|
* and has to be 0 for cgroup local storage.
|
|
*
|
|
* Depending on the BPF program type, a local storage area
|
|
* can be shared between multiple instances of the BPF program,
|
|
* running simultaneously.
|
|
*
|
|
* A user should care about the synchronization by himself.
|
|
* For example, by using the **BPF_ATOMIC** instructions to alter
|
|
* the shared data.
|
|
* Return
|
|
* A pointer to the local storage area.
|
|
*
|
|
* long bpf_sk_select_reuseport(struct sk_reuseport_md *reuse, struct bpf_map *map, void *key, u64 flags)
|
|
* Description
|
|
* Select a **SO_REUSEPORT** socket from a
|
|
* **BPF_MAP_TYPE_REUSEPORT_SOCKARRAY** *map*.
|
|
* It checks the selected socket is matching the incoming
|
|
* request in the socket buffer.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* u64 bpf_skb_ancestor_cgroup_id(struct sk_buff *skb, int ancestor_level)
|
|
* Description
|
|
* Return id of cgroup v2 that is ancestor of cgroup associated
|
|
* with the *skb* at the *ancestor_level*. The root cgroup is at
|
|
* *ancestor_level* zero and each step down the hierarchy
|
|
* increments the level. If *ancestor_level* == level of cgroup
|
|
* associated with *skb*, then return value will be same as that
|
|
* of **bpf_skb_cgroup_id**\ ().
|
|
*
|
|
* The helper is useful to implement policies based on cgroups
|
|
* that are upper in hierarchy than immediate cgroup associated
|
|
* with *skb*.
|
|
*
|
|
* The format of returned id and helper limitations are same as in
|
|
* **bpf_skb_cgroup_id**\ ().
|
|
* Return
|
|
* The id is returned or 0 in case the id could not be retrieved.
|
|
*
|
|
* struct bpf_sock *bpf_sk_lookup_tcp(void *ctx, struct bpf_sock_tuple *tuple, u32 tuple_size, u64 netns, u64 flags)
|
|
* Description
|
|
* Look for TCP socket matching *tuple*, optionally in a child
|
|
* network namespace *netns*. The return value must be checked,
|
|
* and if non-**NULL**, released via **bpf_sk_release**\ ().
|
|
*
|
|
* The *ctx* should point to the context of the program, such as
|
|
* the skb or socket (depending on the hook in use). This is used
|
|
* to determine the base network namespace for the lookup.
|
|
*
|
|
* *tuple_size* must be one of:
|
|
*
|
|
* **sizeof**\ (*tuple*\ **->ipv4**)
|
|
* Look for an IPv4 socket.
|
|
* **sizeof**\ (*tuple*\ **->ipv6**)
|
|
* Look for an IPv6 socket.
|
|
*
|
|
* If the *netns* is a negative signed 32-bit integer, then the
|
|
* socket lookup table in the netns associated with the *ctx*
|
|
* will be used. For the TC hooks, this is the netns of the device
|
|
* in the skb. For socket hooks, this is the netns of the socket.
|
|
* If *netns* is any other signed 32-bit value greater than or
|
|
* equal to zero then it specifies the ID of the netns relative to
|
|
* the netns associated with the *ctx*. *netns* values beyond the
|
|
* range of 32-bit integers are reserved for future use.
|
|
*
|
|
* All values for *flags* are reserved for future usage, and must
|
|
* be left at zero.
|
|
*
|
|
* This helper is available only if the kernel was compiled with
|
|
* **CONFIG_NET** configuration option.
|
|
* Return
|
|
* Pointer to **struct bpf_sock**, or **NULL** in case of failure.
|
|
* For sockets with reuseport option, the **struct bpf_sock**
|
|
* result is from *reuse*\ **->socks**\ [] using the hash of the
|
|
* tuple.
|
|
*
|
|
* struct bpf_sock *bpf_sk_lookup_udp(void *ctx, struct bpf_sock_tuple *tuple, u32 tuple_size, u64 netns, u64 flags)
|
|
* Description
|
|
* Look for UDP socket matching *tuple*, optionally in a child
|
|
* network namespace *netns*. The return value must be checked,
|
|
* and if non-**NULL**, released via **bpf_sk_release**\ ().
|
|
*
|
|
* The *ctx* should point to the context of the program, such as
|
|
* the skb or socket (depending on the hook in use). This is used
|
|
* to determine the base network namespace for the lookup.
|
|
*
|
|
* *tuple_size* must be one of:
|
|
*
|
|
* **sizeof**\ (*tuple*\ **->ipv4**)
|
|
* Look for an IPv4 socket.
|
|
* **sizeof**\ (*tuple*\ **->ipv6**)
|
|
* Look for an IPv6 socket.
|
|
*
|
|
* If the *netns* is a negative signed 32-bit integer, then the
|
|
* socket lookup table in the netns associated with the *ctx*
|
|
* will be used. For the TC hooks, this is the netns of the device
|
|
* in the skb. For socket hooks, this is the netns of the socket.
|
|
* If *netns* is any other signed 32-bit value greater than or
|
|
* equal to zero then it specifies the ID of the netns relative to
|
|
* the netns associated with the *ctx*. *netns* values beyond the
|
|
* range of 32-bit integers are reserved for future use.
|
|
*
|
|
* All values for *flags* are reserved for future usage, and must
|
|
* be left at zero.
|
|
*
|
|
* This helper is available only if the kernel was compiled with
|
|
* **CONFIG_NET** configuration option.
|
|
* Return
|
|
* Pointer to **struct bpf_sock**, or **NULL** in case of failure.
|
|
* For sockets with reuseport option, the **struct bpf_sock**
|
|
* result is from *reuse*\ **->socks**\ [] using the hash of the
|
|
* tuple.
|
|
*
|
|
* long bpf_sk_release(void *sock)
|
|
* Description
|
|
* Release the reference held by *sock*. *sock* must be a
|
|
* non-**NULL** pointer that was returned from
|
|
* **bpf_sk_lookup_xxx**\ ().
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_map_push_elem(struct bpf_map *map, const void *value, u64 flags)
|
|
* Description
|
|
* Push an element *value* in *map*. *flags* is one of:
|
|
*
|
|
* **BPF_EXIST**
|
|
* If the queue/stack is full, the oldest element is
|
|
* removed to make room for this.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_map_pop_elem(struct bpf_map *map, void *value)
|
|
* Description
|
|
* Pop an element from *map*.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_map_peek_elem(struct bpf_map *map, void *value)
|
|
* Description
|
|
* Get an element from *map* without removing it.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_msg_push_data(struct sk_msg_buff *msg, u32 start, u32 len, u64 flags)
|
|
* Description
|
|
* For socket policies, insert *len* bytes into *msg* at offset
|
|
* *start*.
|
|
*
|
|
* If a program of type **BPF_PROG_TYPE_SK_MSG** is run on a
|
|
* *msg* it may want to insert metadata or options into the *msg*.
|
|
* This can later be read and used by any of the lower layer BPF
|
|
* hooks.
|
|
*
|
|
* This helper may fail if under memory pressure (a malloc
|
|
* fails) in these cases BPF programs will get an appropriate
|
|
* error and BPF programs will need to handle them.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_msg_pop_data(struct sk_msg_buff *msg, u32 start, u32 len, u64 flags)
|
|
* Description
|
|
* Will remove *len* bytes from a *msg* starting at byte *start*.
|
|
* This may result in **ENOMEM** errors under certain situations if
|
|
* an allocation and copy are required due to a full ring buffer.
|
|
* However, the helper will try to avoid doing the allocation
|
|
* if possible. Other errors can occur if input parameters are
|
|
* invalid either due to *start* byte not being valid part of *msg*
|
|
* payload and/or *pop* value being to large.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_rc_pointer_rel(void *ctx, s32 rel_x, s32 rel_y)
|
|
* Description
|
|
* This helper is used in programs implementing IR decoding, to
|
|
* report a successfully decoded pointer movement.
|
|
*
|
|
* The *ctx* should point to the lirc sample as passed into
|
|
* the program.
|
|
*
|
|
* This helper is only available is the kernel was compiled with
|
|
* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
|
|
* "**y**".
|
|
* Return
|
|
* 0
|
|
*
|
|
* long bpf_spin_lock(struct bpf_spin_lock *lock)
|
|
* Description
|
|
* Acquire a spinlock represented by the pointer *lock*, which is
|
|
* stored as part of a value of a map. Taking the lock allows to
|
|
* safely update the rest of the fields in that value. The
|
|
* spinlock can (and must) later be released with a call to
|
|
* **bpf_spin_unlock**\ (\ *lock*\ ).
|
|
*
|
|
* Spinlocks in BPF programs come with a number of restrictions
|
|
* and constraints:
|
|
*
|
|
* * **bpf_spin_lock** objects are only allowed inside maps of
|
|
* types **BPF_MAP_TYPE_HASH** and **BPF_MAP_TYPE_ARRAY** (this
|
|
* list could be extended in the future).
|
|
* * BTF description of the map is mandatory.
|
|
* * The BPF program can take ONE lock at a time, since taking two
|
|
* or more could cause dead locks.
|
|
* * Only one **struct bpf_spin_lock** is allowed per map element.
|
|
* * When the lock is taken, calls (either BPF to BPF or helpers)
|
|
* are not allowed.
|
|
* * The **BPF_LD_ABS** and **BPF_LD_IND** instructions are not
|
|
* allowed inside a spinlock-ed region.
|
|
* * The BPF program MUST call **bpf_spin_unlock**\ () to release
|
|
* the lock, on all execution paths, before it returns.
|
|
* * The BPF program can access **struct bpf_spin_lock** only via
|
|
* the **bpf_spin_lock**\ () and **bpf_spin_unlock**\ ()
|
|
* helpers. Loading or storing data into the **struct
|
|
* bpf_spin_lock** *lock*\ **;** field of a map is not allowed.
|
|
* * To use the **bpf_spin_lock**\ () helper, the BTF description
|
|
* of the map value must be a struct and have **struct
|
|
* bpf_spin_lock** *anyname*\ **;** field at the top level.
|
|
* Nested lock inside another struct is not allowed.
|
|
* * The **struct bpf_spin_lock** *lock* field in a map value must
|
|
* be aligned on a multiple of 4 bytes in that value.
|
|
* * Syscall with command **BPF_MAP_LOOKUP_ELEM** does not copy
|
|
* the **bpf_spin_lock** field to user space.
|
|
* * Syscall with command **BPF_MAP_UPDATE_ELEM**, or update from
|
|
* a BPF program, do not update the **bpf_spin_lock** field.
|
|
* * **bpf_spin_lock** cannot be on the stack or inside a
|
|
* networking packet (it can only be inside of a map values).
|
|
* * **bpf_spin_lock** is available to root only.
|
|
* * Tracing programs and socket filter programs cannot use
|
|
* **bpf_spin_lock**\ () due to insufficient preemption checks
|
|
* (but this may change in the future).
|
|
* * **bpf_spin_lock** is not allowed in inner maps of map-in-map.
|
|
* Return
|
|
* 0
|
|
*
|
|
* long bpf_spin_unlock(struct bpf_spin_lock *lock)
|
|
* Description
|
|
* Release the *lock* previously locked by a call to
|
|
* **bpf_spin_lock**\ (\ *lock*\ ).
|
|
* Return
|
|
* 0
|
|
*
|
|
* struct bpf_sock *bpf_sk_fullsock(struct bpf_sock *sk)
|
|
* Description
|
|
* This helper gets a **struct bpf_sock** pointer such
|
|
* that all the fields in this **bpf_sock** can be accessed.
|
|
* Return
|
|
* A **struct bpf_sock** pointer on success, or **NULL** in
|
|
* case of failure.
|
|
*
|
|
* struct bpf_tcp_sock *bpf_tcp_sock(struct bpf_sock *sk)
|
|
* Description
|
|
* This helper gets a **struct bpf_tcp_sock** pointer from a
|
|
* **struct bpf_sock** pointer.
|
|
* Return
|
|
* A **struct bpf_tcp_sock** pointer on success, or **NULL** in
|
|
* case of failure.
|
|
*
|
|
* long bpf_skb_ecn_set_ce(struct sk_buff *skb)
|
|
* Description
|
|
* Set ECN (Explicit Congestion Notification) field of IP header
|
|
* to **CE** (Congestion Encountered) if current value is **ECT**
|
|
* (ECN Capable Transport). Otherwise, do nothing. Works with IPv6
|
|
* and IPv4.
|
|
* Return
|
|
* 1 if the **CE** flag is set (either by the current helper call
|
|
* or because it was already present), 0 if it is not set.
|
|
*
|
|
* struct bpf_sock *bpf_get_listener_sock(struct bpf_sock *sk)
|
|
* Description
|
|
* Return a **struct bpf_sock** pointer in **TCP_LISTEN** state.
|
|
* **bpf_sk_release**\ () is unnecessary and not allowed.
|
|
* Return
|
|
* A **struct bpf_sock** pointer on success, or **NULL** in
|
|
* case of failure.
|
|
*
|
|
* struct bpf_sock *bpf_skc_lookup_tcp(void *ctx, struct bpf_sock_tuple *tuple, u32 tuple_size, u64 netns, u64 flags)
|
|
* Description
|
|
* Look for TCP socket matching *tuple*, optionally in a child
|
|
* network namespace *netns*. The return value must be checked,
|
|
* and if non-**NULL**, released via **bpf_sk_release**\ ().
|
|
*
|
|
* This function is identical to **bpf_sk_lookup_tcp**\ (), except
|
|
* that it also returns timewait or request sockets. Use
|
|
* **bpf_sk_fullsock**\ () or **bpf_tcp_sock**\ () to access the
|
|
* full structure.
|
|
*
|
|
* This helper is available only if the kernel was compiled with
|
|
* **CONFIG_NET** configuration option.
|
|
* Return
|
|
* Pointer to **struct bpf_sock**, or **NULL** in case of failure.
|
|
* For sockets with reuseport option, the **struct bpf_sock**
|
|
* result is from *reuse*\ **->socks**\ [] using the hash of the
|
|
* tuple.
|
|
*
|
|
* long bpf_tcp_check_syncookie(void *sk, void *iph, u32 iph_len, struct tcphdr *th, u32 th_len)
|
|
* Description
|
|
* Check whether *iph* and *th* contain a valid SYN cookie ACK for
|
|
* the listening socket in *sk*.
|
|
*
|
|
* *iph* points to the start of the IPv4 or IPv6 header, while
|
|
* *iph_len* contains **sizeof**\ (**struct iphdr**) or
|
|
* **sizeof**\ (**struct ipv6hdr**).
|
|
*
|
|
* *th* points to the start of the TCP header, while *th_len*
|
|
* contains the length of the TCP header (at least
|
|
* **sizeof**\ (**struct tcphdr**)).
|
|
* Return
|
|
* 0 if *iph* and *th* are a valid SYN cookie ACK, or a negative
|
|
* error otherwise.
|
|
*
|
|
* long bpf_sysctl_get_name(struct bpf_sysctl *ctx, char *buf, size_t buf_len, u64 flags)
|
|
* Description
|
|
* Get name of sysctl in /proc/sys/ and copy it into provided by
|
|
* program buffer *buf* of size *buf_len*.
|
|
*
|
|
* The buffer is always NUL terminated, unless it's zero-sized.
|
|
*
|
|
* If *flags* is zero, full name (e.g. "net/ipv4/tcp_mem") is
|
|
* copied. Use **BPF_F_SYSCTL_BASE_NAME** flag to copy base name
|
|
* only (e.g. "tcp_mem").
|
|
* Return
|
|
* Number of character copied (not including the trailing NUL).
|
|
*
|
|
* **-E2BIG** if the buffer wasn't big enough (*buf* will contain
|
|
* truncated name in this case).
|
|
*
|
|
* long bpf_sysctl_get_current_value(struct bpf_sysctl *ctx, char *buf, size_t buf_len)
|
|
* Description
|
|
* Get current value of sysctl as it is presented in /proc/sys
|
|
* (incl. newline, etc), and copy it as a string into provided
|
|
* by program buffer *buf* of size *buf_len*.
|
|
*
|
|
* The whole value is copied, no matter what file position user
|
|
* space issued e.g. sys_read at.
|
|
*
|
|
* The buffer is always NUL terminated, unless it's zero-sized.
|
|
* Return
|
|
* Number of character copied (not including the trailing NUL).
|
|
*
|
|
* **-E2BIG** if the buffer wasn't big enough (*buf* will contain
|
|
* truncated name in this case).
|
|
*
|
|
* **-EINVAL** if current value was unavailable, e.g. because
|
|
* sysctl is uninitialized and read returns -EIO for it.
|
|
*
|
|
* long bpf_sysctl_get_new_value(struct bpf_sysctl *ctx, char *buf, size_t buf_len)
|
|
* Description
|
|
* Get new value being written by user space to sysctl (before
|
|
* the actual write happens) and copy it as a string into
|
|
* provided by program buffer *buf* of size *buf_len*.
|
|
*
|
|
* User space may write new value at file position > 0.
|
|
*
|
|
* The buffer is always NUL terminated, unless it's zero-sized.
|
|
* Return
|
|
* Number of character copied (not including the trailing NUL).
|
|
*
|
|
* **-E2BIG** if the buffer wasn't big enough (*buf* will contain
|
|
* truncated name in this case).
|
|
*
|
|
* **-EINVAL** if sysctl is being read.
|
|
*
|
|
* long bpf_sysctl_set_new_value(struct bpf_sysctl *ctx, const char *buf, size_t buf_len)
|
|
* Description
|
|
* Override new value being written by user space to sysctl with
|
|
* value provided by program in buffer *buf* of size *buf_len*.
|
|
*
|
|
* *buf* should contain a string in same form as provided by user
|
|
* space on sysctl write.
|
|
*
|
|
* User space may write new value at file position > 0. To override
|
|
* the whole sysctl value file position should be set to zero.
|
|
* Return
|
|
* 0 on success.
|
|
*
|
|
* **-E2BIG** if the *buf_len* is too big.
|
|
*
|
|
* **-EINVAL** if sysctl is being read.
|
|
*
|
|
* long bpf_strtol(const char *buf, size_t buf_len, u64 flags, long *res)
|
|
* Description
|
|
* Convert the initial part of the string from buffer *buf* of
|
|
* size *buf_len* to a long integer according to the given base
|
|
* and save the result in *res*.
|
|
*
|
|
* The string may begin with an arbitrary amount of white space
|
|
* (as determined by **isspace**\ (3)) followed by a single
|
|
* optional '**-**' sign.
|
|
*
|
|
* Five least significant bits of *flags* encode base, other bits
|
|
* are currently unused.
|
|
*
|
|
* Base must be either 8, 10, 16 or 0 to detect it automatically
|
|
* similar to user space **strtol**\ (3).
|
|
* Return
|
|
* Number of characters consumed on success. Must be positive but
|
|
* no more than *buf_len*.
|
|
*
|
|
* **-EINVAL** if no valid digits were found or unsupported base
|
|
* was provided.
|
|
*
|
|
* **-ERANGE** if resulting value was out of range.
|
|
*
|
|
* long bpf_strtoul(const char *buf, size_t buf_len, u64 flags, unsigned long *res)
|
|
* Description
|
|
* Convert the initial part of the string from buffer *buf* of
|
|
* size *buf_len* to an unsigned long integer according to the
|
|
* given base and save the result in *res*.
|
|
*
|
|
* The string may begin with an arbitrary amount of white space
|
|
* (as determined by **isspace**\ (3)).
|
|
*
|
|
* Five least significant bits of *flags* encode base, other bits
|
|
* are currently unused.
|
|
*
|
|
* Base must be either 8, 10, 16 or 0 to detect it automatically
|
|
* similar to user space **strtoul**\ (3).
|
|
* Return
|
|
* Number of characters consumed on success. Must be positive but
|
|
* no more than *buf_len*.
|
|
*
|
|
* **-EINVAL** if no valid digits were found or unsupported base
|
|
* was provided.
|
|
*
|
|
* **-ERANGE** if resulting value was out of range.
|
|
*
|
|
* void *bpf_sk_storage_get(struct bpf_map *map, void *sk, void *value, u64 flags)
|
|
* Description
|
|
* Get a bpf-local-storage from a *sk*.
|
|
*
|
|
* Logically, it could be thought of getting the value from
|
|
* a *map* with *sk* as the **key**. From this
|
|
* perspective, the usage is not much different from
|
|
* **bpf_map_lookup_elem**\ (*map*, **&**\ *sk*) except this
|
|
* helper enforces the key must be a full socket and the map must
|
|
* be a **BPF_MAP_TYPE_SK_STORAGE** also.
|
|
*
|
|
* Underneath, the value is stored locally at *sk* instead of
|
|
* the *map*. The *map* is used as the bpf-local-storage
|
|
* "type". The bpf-local-storage "type" (i.e. the *map*) is
|
|
* searched against all bpf-local-storages residing at *sk*.
|
|
*
|
|
* *sk* is a kernel **struct sock** pointer for LSM program.
|
|
* *sk* is a **struct bpf_sock** pointer for other program types.
|
|
*
|
|
* An optional *flags* (**BPF_SK_STORAGE_GET_F_CREATE**) can be
|
|
* used such that a new bpf-local-storage will be
|
|
* created if one does not exist. *value* can be used
|
|
* together with **BPF_SK_STORAGE_GET_F_CREATE** to specify
|
|
* the initial value of a bpf-local-storage. If *value* is
|
|
* **NULL**, the new bpf-local-storage will be zero initialized.
|
|
* Return
|
|
* A bpf-local-storage pointer is returned on success.
|
|
*
|
|
* **NULL** if not found or there was an error in adding
|
|
* a new bpf-local-storage.
|
|
*
|
|
* long bpf_sk_storage_delete(struct bpf_map *map, void *sk)
|
|
* Description
|
|
* Delete a bpf-local-storage from a *sk*.
|
|
* Return
|
|
* 0 on success.
|
|
*
|
|
* **-ENOENT** if the bpf-local-storage cannot be found.
|
|
* **-EINVAL** if sk is not a fullsock (e.g. a request_sock).
|
|
*
|
|
* long bpf_send_signal(u32 sig)
|
|
* Description
|
|
* Send signal *sig* to the process of the current task.
|
|
* The signal may be delivered to any of this process's threads.
|
|
* Return
|
|
* 0 on success or successfully queued.
|
|
*
|
|
* **-EBUSY** if work queue under nmi is full.
|
|
*
|
|
* **-EINVAL** if *sig* is invalid.
|
|
*
|
|
* **-EPERM** if no permission to send the *sig*.
|
|
*
|
|
* **-EAGAIN** if bpf program can try again.
|
|
*
|
|
* s64 bpf_tcp_gen_syncookie(void *sk, void *iph, u32 iph_len, struct tcphdr *th, u32 th_len)
|
|
* Description
|
|
* Try to issue a SYN cookie for the packet with corresponding
|
|
* IP/TCP headers, *iph* and *th*, on the listening socket in *sk*.
|
|
*
|
|
* *iph* points to the start of the IPv4 or IPv6 header, while
|
|
* *iph_len* contains **sizeof**\ (**struct iphdr**) or
|
|
* **sizeof**\ (**struct ipv6hdr**).
|
|
*
|
|
* *th* points to the start of the TCP header, while *th_len*
|
|
* contains the length of the TCP header with options (at least
|
|
* **sizeof**\ (**struct tcphdr**)).
|
|
* Return
|
|
* On success, lower 32 bits hold the generated SYN cookie in
|
|
* followed by 16 bits which hold the MSS value for that cookie,
|
|
* and the top 16 bits are unused.
|
|
*
|
|
* On failure, the returned value is one of the following:
|
|
*
|
|
* **-EINVAL** SYN cookie cannot be issued due to error
|
|
*
|
|
* **-ENOENT** SYN cookie should not be issued (no SYN flood)
|
|
*
|
|
* **-EOPNOTSUPP** kernel configuration does not enable SYN cookies
|
|
*
|
|
* **-EPROTONOSUPPORT** IP packet version is not 4 or 6
|
|
*
|
|
* long bpf_skb_output(void *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
|
|
* Description
|
|
* Write raw *data* blob into a special BPF perf event held by
|
|
* *map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
|
|
* event must have the following attributes: **PERF_SAMPLE_RAW**
|
|
* as **sample_type**, **PERF_TYPE_SOFTWARE** as **type**, and
|
|
* **PERF_COUNT_SW_BPF_OUTPUT** as **config**.
|
|
*
|
|
* The *flags* are used to indicate the index in *map* for which
|
|
* the value must be put, masked with **BPF_F_INDEX_MASK**.
|
|
* Alternatively, *flags* can be set to **BPF_F_CURRENT_CPU**
|
|
* to indicate that the index of the current CPU core should be
|
|
* used.
|
|
*
|
|
* The value to write, of *size*, is passed through eBPF stack and
|
|
* pointed by *data*.
|
|
*
|
|
* *ctx* is a pointer to in-kernel struct sk_buff.
|
|
*
|
|
* This helper is similar to **bpf_perf_event_output**\ () but
|
|
* restricted to raw_tracepoint bpf programs.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_probe_read_user(void *dst, u32 size, const void *unsafe_ptr)
|
|
* Description
|
|
* Safely attempt to read *size* bytes from user space address
|
|
* *unsafe_ptr* and store the data in *dst*.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
|
|
* Description
|
|
* Safely attempt to read *size* bytes from kernel space address
|
|
* *unsafe_ptr* and store the data in *dst*.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_probe_read_user_str(void *dst, u32 size, const void *unsafe_ptr)
|
|
* Description
|
|
* Copy a NUL terminated string from an unsafe user address
|
|
* *unsafe_ptr* to *dst*. The *size* should include the
|
|
* terminating NUL byte. In case the string length is smaller than
|
|
* *size*, the target is not padded with further NUL bytes. If the
|
|
* string length is larger than *size*, just *size*-1 bytes are
|
|
* copied and the last byte is set to NUL.
|
|
*
|
|
* On success, returns the number of bytes that were written,
|
|
* including the terminal NUL. This makes this helper useful in
|
|
* tracing programs for reading strings, and more importantly to
|
|
* get its length at runtime. See the following snippet:
|
|
*
|
|
* ::
|
|
*
|
|
* SEC("kprobe/sys_open")
|
|
* void bpf_sys_open(struct pt_regs *ctx)
|
|
* {
|
|
* char buf[PATHLEN]; // PATHLEN is defined to 256
|
|
* int res = bpf_probe_read_user_str(buf, sizeof(buf),
|
|
* ctx->di);
|
|
*
|
|
* // Consume buf, for example push it to
|
|
* // userspace via bpf_perf_event_output(); we
|
|
* // can use res (the string length) as event
|
|
* // size, after checking its boundaries.
|
|
* }
|
|
*
|
|
* In comparison, using **bpf_probe_read_user**\ () helper here
|
|
* instead to read the string would require to estimate the length
|
|
* at compile time, and would often result in copying more memory
|
|
* than necessary.
|
|
*
|
|
* Another useful use case is when parsing individual process
|
|
* arguments or individual environment variables navigating
|
|
* *current*\ **->mm->arg_start** and *current*\
|
|
* **->mm->env_start**: using this helper and the return value,
|
|
* one can quickly iterate at the right offset of the memory area.
|
|
* Return
|
|
* On success, the strictly positive length of the output string,
|
|
* including the trailing NUL character. On error, a negative
|
|
* value.
|
|
*
|
|
* long bpf_probe_read_kernel_str(void *dst, u32 size, const void *unsafe_ptr)
|
|
* Description
|
|
* Copy a NUL terminated string from an unsafe kernel address *unsafe_ptr*
|
|
* to *dst*. Same semantics as with **bpf_probe_read_user_str**\ () apply.
|
|
* Return
|
|
* On success, the strictly positive length of the string, including
|
|
* the trailing NUL character. On error, a negative value.
|
|
*
|
|
* long bpf_tcp_send_ack(void *tp, u32 rcv_nxt)
|
|
* Description
|
|
* Send out a tcp-ack. *tp* is the in-kernel struct **tcp_sock**.
|
|
* *rcv_nxt* is the ack_seq to be sent out.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_send_signal_thread(u32 sig)
|
|
* Description
|
|
* Send signal *sig* to the thread corresponding to the current task.
|
|
* Return
|
|
* 0 on success or successfully queued.
|
|
*
|
|
* **-EBUSY** if work queue under nmi is full.
|
|
*
|
|
* **-EINVAL** if *sig* is invalid.
|
|
*
|
|
* **-EPERM** if no permission to send the *sig*.
|
|
*
|
|
* **-EAGAIN** if bpf program can try again.
|
|
*
|
|
* u64 bpf_jiffies64(void)
|
|
* Description
|
|
* Obtain the 64bit jiffies
|
|
* Return
|
|
* The 64 bit jiffies
|
|
*
|
|
* long bpf_read_branch_records(struct bpf_perf_event_data *ctx, void *buf, u32 size, u64 flags)
|
|
* Description
|
|
* For an eBPF program attached to a perf event, retrieve the
|
|
* branch records (**struct perf_branch_entry**) associated to *ctx*
|
|
* and store it in the buffer pointed by *buf* up to size
|
|
* *size* bytes.
|
|
* Return
|
|
* On success, number of bytes written to *buf*. On error, a
|
|
* negative value.
|
|
*
|
|
* The *flags* can be set to **BPF_F_GET_BRANCH_RECORDS_SIZE** to
|
|
* instead return the number of bytes required to store all the
|
|
* branch entries. If this flag is set, *buf* may be NULL.
|
|
*
|
|
* **-EINVAL** if arguments invalid or **size** not a multiple
|
|
* of **sizeof**\ (**struct perf_branch_entry**\ ).
|
|
*
|
|
* **-ENOENT** if architecture does not support branch records.
|
|
*
|
|
* long bpf_get_ns_current_pid_tgid(u64 dev, u64 ino, struct bpf_pidns_info *nsdata, u32 size)
|
|
* Description
|
|
* Returns 0 on success, values for *pid* and *tgid* as seen from the current
|
|
* *namespace* will be returned in *nsdata*.
|
|
* Return
|
|
* 0 on success, or one of the following in case of failure:
|
|
*
|
|
* **-EINVAL** if dev and inum supplied don't match dev_t and inode number
|
|
* with nsfs of current task, or if dev conversion to dev_t lost high bits.
|
|
*
|
|
* **-ENOENT** if pidns does not exists for the current task.
|
|
*
|
|
* long bpf_xdp_output(void *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
|
|
* Description
|
|
* Write raw *data* blob into a special BPF perf event held by
|
|
* *map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
|
|
* event must have the following attributes: **PERF_SAMPLE_RAW**
|
|
* as **sample_type**, **PERF_TYPE_SOFTWARE** as **type**, and
|
|
* **PERF_COUNT_SW_BPF_OUTPUT** as **config**.
|
|
*
|
|
* The *flags* are used to indicate the index in *map* for which
|
|
* the value must be put, masked with **BPF_F_INDEX_MASK**.
|
|
* Alternatively, *flags* can be set to **BPF_F_CURRENT_CPU**
|
|
* to indicate that the index of the current CPU core should be
|
|
* used.
|
|
*
|
|
* The value to write, of *size*, is passed through eBPF stack and
|
|
* pointed by *data*.
|
|
*
|
|
* *ctx* is a pointer to in-kernel struct xdp_buff.
|
|
*
|
|
* This helper is similar to **bpf_perf_eventoutput**\ () but
|
|
* restricted to raw_tracepoint bpf programs.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* u64 bpf_get_netns_cookie(void *ctx)
|
|
* Description
|
|
* Retrieve the cookie (generated by the kernel) of the network
|
|
* namespace the input *ctx* is associated with. The network
|
|
* namespace cookie remains stable for its lifetime and provides
|
|
* a global identifier that can be assumed unique. If *ctx* is
|
|
* NULL, then the helper returns the cookie for the initial
|
|
* network namespace. The cookie itself is very similar to that
|
|
* of **bpf_get_socket_cookie**\ () helper, but for network
|
|
* namespaces instead of sockets.
|
|
* Return
|
|
* A 8-byte long opaque number.
|
|
*
|
|
* u64 bpf_get_current_ancestor_cgroup_id(int ancestor_level)
|
|
* Description
|
|
* Return id of cgroup v2 that is ancestor of the cgroup associated
|
|
* with the current task at the *ancestor_level*. The root cgroup
|
|
* is at *ancestor_level* zero and each step down the hierarchy
|
|
* increments the level. If *ancestor_level* == level of cgroup
|
|
* associated with the current task, then return value will be the
|
|
* same as that of **bpf_get_current_cgroup_id**\ ().
|
|
*
|
|
* The helper is useful to implement policies based on cgroups
|
|
* that are upper in hierarchy than immediate cgroup associated
|
|
* with the current task.
|
|
*
|
|
* The format of returned id and helper limitations are same as in
|
|
* **bpf_get_current_cgroup_id**\ ().
|
|
* Return
|
|
* The id is returned or 0 in case the id could not be retrieved.
|
|
*
|
|
* long bpf_sk_assign(struct sk_buff *skb, void *sk, u64 flags)
|
|
* Description
|
|
* Helper is overloaded depending on BPF program type. This
|
|
* description applies to **BPF_PROG_TYPE_SCHED_CLS** and
|
|
* **BPF_PROG_TYPE_SCHED_ACT** programs.
|
|
*
|
|
* Assign the *sk* to the *skb*. When combined with appropriate
|
|
* routing configuration to receive the packet towards the socket,
|
|
* will cause *skb* to be delivered to the specified socket.
|
|
* Subsequent redirection of *skb* via **bpf_redirect**\ (),
|
|
* **bpf_clone_redirect**\ () or other methods outside of BPF may
|
|
* interfere with successful delivery to the socket.
|
|
*
|
|
* This operation is only valid from TC ingress path.
|
|
*
|
|
* The *flags* argument must be zero.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure:
|
|
*
|
|
* **-EINVAL** if specified *flags* are not supported.
|
|
*
|
|
* **-ENOENT** if the socket is unavailable for assignment.
|
|
*
|
|
* **-ENETUNREACH** if the socket is unreachable (wrong netns).
|
|
*
|
|
* **-EOPNOTSUPP** if the operation is not supported, for example
|
|
* a call from outside of TC ingress.
|
|
*
|
|
* **-ESOCKTNOSUPPORT** if the socket type is not supported
|
|
* (reuseport).
|
|
*
|
|
* long bpf_sk_assign(struct bpf_sk_lookup *ctx, struct bpf_sock *sk, u64 flags)
|
|
* Description
|
|
* Helper is overloaded depending on BPF program type. This
|
|
* description applies to **BPF_PROG_TYPE_SK_LOOKUP** programs.
|
|
*
|
|
* Select the *sk* as a result of a socket lookup.
|
|
*
|
|
* For the operation to succeed passed socket must be compatible
|
|
* with the packet description provided by the *ctx* object.
|
|
*
|
|
* L4 protocol (**IPPROTO_TCP** or **IPPROTO_UDP**) must
|
|
* be an exact match. While IP family (**AF_INET** or
|
|
* **AF_INET6**) must be compatible, that is IPv6 sockets
|
|
* that are not v6-only can be selected for IPv4 packets.
|
|
*
|
|
* Only TCP listeners and UDP unconnected sockets can be
|
|
* selected. *sk* can also be NULL to reset any previous
|
|
* selection.
|
|
*
|
|
* *flags* argument can combination of following values:
|
|
*
|
|
* * **BPF_SK_LOOKUP_F_REPLACE** to override the previous
|
|
* socket selection, potentially done by a BPF program
|
|
* that ran before us.
|
|
*
|
|
* * **BPF_SK_LOOKUP_F_NO_REUSEPORT** to skip
|
|
* load-balancing within reuseport group for the socket
|
|
* being selected.
|
|
*
|
|
* On success *ctx->sk* will point to the selected socket.
|
|
*
|
|
* Return
|
|
* 0 on success, or a negative errno in case of failure.
|
|
*
|
|
* * **-EAFNOSUPPORT** if socket family (*sk->family*) is
|
|
* not compatible with packet family (*ctx->family*).
|
|
*
|
|
* * **-EEXIST** if socket has been already selected,
|
|
* potentially by another program, and
|
|
* **BPF_SK_LOOKUP_F_REPLACE** flag was not specified.
|
|
*
|
|
* * **-EINVAL** if unsupported flags were specified.
|
|
*
|
|
* * **-EPROTOTYPE** if socket L4 protocol
|
|
* (*sk->protocol*) doesn't match packet protocol
|
|
* (*ctx->protocol*).
|
|
*
|
|
* * **-ESOCKTNOSUPPORT** if socket is not in allowed
|
|
* state (TCP listening or UDP unconnected).
|
|
*
|
|
* u64 bpf_ktime_get_boot_ns(void)
|
|
* Description
|
|
* Return the time elapsed since system boot, in nanoseconds.
|
|
* Does include the time the system was suspended.
|
|
* See: **clock_gettime**\ (**CLOCK_BOOTTIME**)
|
|
* Return
|
|
* Current *ktime*.
|
|
*
|
|
* long bpf_seq_printf(struct seq_file *m, const char *fmt, u32 fmt_size, const void *data, u32 data_len)
|
|
* Description
|
|
* **bpf_seq_printf**\ () uses seq_file **seq_printf**\ () to print
|
|
* out the format string.
|
|
* The *m* represents the seq_file. The *fmt* and *fmt_size* are for
|
|
* the format string itself. The *data* and *data_len* are format string
|
|
* arguments. The *data* are a **u64** array and corresponding format string
|
|
* values are stored in the array. For strings and pointers where pointees
|
|
* are accessed, only the pointer values are stored in the *data* array.
|
|
* The *data_len* is the size of *data* in bytes - must be a multiple of 8.
|
|
*
|
|
* Formats **%s**, **%p{i,I}{4,6}** requires to read kernel memory.
|
|
* Reading kernel memory may fail due to either invalid address or
|
|
* valid address but requiring a major memory fault. If reading kernel memory
|
|
* fails, the string for **%s** will be an empty string, and the ip
|
|
* address for **%p{i,I}{4,6}** will be 0. Not returning error to
|
|
* bpf program is consistent with what **bpf_trace_printk**\ () does for now.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure:
|
|
*
|
|
* **-EBUSY** if per-CPU memory copy buffer is busy, can try again
|
|
* by returning 1 from bpf program.
|
|
*
|
|
* **-EINVAL** if arguments are invalid, or if *fmt* is invalid/unsupported.
|
|
*
|
|
* **-E2BIG** if *fmt* contains too many format specifiers.
|
|
*
|
|
* **-EOVERFLOW** if an overflow happened: The same object will be tried again.
|
|
*
|
|
* long bpf_seq_write(struct seq_file *m, const void *data, u32 len)
|
|
* Description
|
|
* **bpf_seq_write**\ () uses seq_file **seq_write**\ () to write the data.
|
|
* The *m* represents the seq_file. The *data* and *len* represent the
|
|
* data to write in bytes.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure:
|
|
*
|
|
* **-EOVERFLOW** if an overflow happened: The same object will be tried again.
|
|
*
|
|
* u64 bpf_sk_cgroup_id(void *sk)
|
|
* Description
|
|
* Return the cgroup v2 id of the socket *sk*.
|
|
*
|
|
* *sk* must be a non-**NULL** pointer to a socket, e.g. one
|
|
* returned from **bpf_sk_lookup_xxx**\ (),
|
|
* **bpf_sk_fullsock**\ (), etc. The format of returned id is
|
|
* same as in **bpf_skb_cgroup_id**\ ().
|
|
*
|
|
* This helper is available only if the kernel was compiled with
|
|
* the **CONFIG_SOCK_CGROUP_DATA** configuration option.
|
|
* Return
|
|
* The id is returned or 0 in case the id could not be retrieved.
|
|
*
|
|
* u64 bpf_sk_ancestor_cgroup_id(void *sk, int ancestor_level)
|
|
* Description
|
|
* Return id of cgroup v2 that is ancestor of cgroup associated
|
|
* with the *sk* at the *ancestor_level*. The root cgroup is at
|
|
* *ancestor_level* zero and each step down the hierarchy
|
|
* increments the level. If *ancestor_level* == level of cgroup
|
|
* associated with *sk*, then return value will be same as that
|
|
* of **bpf_sk_cgroup_id**\ ().
|
|
*
|
|
* The helper is useful to implement policies based on cgroups
|
|
* that are upper in hierarchy than immediate cgroup associated
|
|
* with *sk*.
|
|
*
|
|
* The format of returned id and helper limitations are same as in
|
|
* **bpf_sk_cgroup_id**\ ().
|
|
* Return
|
|
* The id is returned or 0 in case the id could not be retrieved.
|
|
*
|
|
* long bpf_ringbuf_output(void *ringbuf, void *data, u64 size, u64 flags)
|
|
* Description
|
|
* Copy *size* bytes from *data* into a ring buffer *ringbuf*.
|
|
* If **BPF_RB_NO_WAKEUP** is specified in *flags*, no notification
|
|
* of new data availability is sent.
|
|
* If **BPF_RB_FORCE_WAKEUP** is specified in *flags*, notification
|
|
* of new data availability is sent unconditionally.
|
|
* If **0** is specified in *flags*, an adaptive notification
|
|
* of new data availability is sent.
|
|
*
|
|
* An adaptive notification is a notification sent whenever the user-space
|
|
* process has caught up and consumed all available payloads. In case the user-space
|
|
* process is still processing a previous payload, then no notification is needed
|
|
* as it will process the newly added payload automatically.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* void *bpf_ringbuf_reserve(void *ringbuf, u64 size, u64 flags)
|
|
* Description
|
|
* Reserve *size* bytes of payload in a ring buffer *ringbuf*.
|
|
* *flags* must be 0.
|
|
* Return
|
|
* Valid pointer with *size* bytes of memory available; NULL,
|
|
* otherwise.
|
|
*
|
|
* void bpf_ringbuf_submit(void *data, u64 flags)
|
|
* Description
|
|
* Submit reserved ring buffer sample, pointed to by *data*.
|
|
* If **BPF_RB_NO_WAKEUP** is specified in *flags*, no notification
|
|
* of new data availability is sent.
|
|
* If **BPF_RB_FORCE_WAKEUP** is specified in *flags*, notification
|
|
* of new data availability is sent unconditionally.
|
|
* If **0** is specified in *flags*, an adaptive notification
|
|
* of new data availability is sent.
|
|
*
|
|
* See 'bpf_ringbuf_output()' for the definition of adaptive notification.
|
|
* Return
|
|
* Nothing. Always succeeds.
|
|
*
|
|
* void bpf_ringbuf_discard(void *data, u64 flags)
|
|
* Description
|
|
* Discard reserved ring buffer sample, pointed to by *data*.
|
|
* If **BPF_RB_NO_WAKEUP** is specified in *flags*, no notification
|
|
* of new data availability is sent.
|
|
* If **BPF_RB_FORCE_WAKEUP** is specified in *flags*, notification
|
|
* of new data availability is sent unconditionally.
|
|
* If **0** is specified in *flags*, an adaptive notification
|
|
* of new data availability is sent.
|
|
*
|
|
* See 'bpf_ringbuf_output()' for the definition of adaptive notification.
|
|
* Return
|
|
* Nothing. Always succeeds.
|
|
*
|
|
* u64 bpf_ringbuf_query(void *ringbuf, u64 flags)
|
|
* Description
|
|
* Query various characteristics of provided ring buffer. What
|
|
* exactly is queries is determined by *flags*:
|
|
*
|
|
* * **BPF_RB_AVAIL_DATA**: Amount of data not yet consumed.
|
|
* * **BPF_RB_RING_SIZE**: The size of ring buffer.
|
|
* * **BPF_RB_CONS_POS**: Consumer position (can wrap around).
|
|
* * **BPF_RB_PROD_POS**: Producer(s) position (can wrap around).
|
|
*
|
|
* Data returned is just a momentary snapshot of actual values
|
|
* and could be inaccurate, so this facility should be used to
|
|
* power heuristics and for reporting, not to make 100% correct
|
|
* calculation.
|
|
* Return
|
|
* Requested value, or 0, if *flags* are not recognized.
|
|
*
|
|
* long bpf_csum_level(struct sk_buff *skb, u64 level)
|
|
* Description
|
|
* Change the skbs checksum level by one layer up or down, or
|
|
* reset it entirely to none in order to have the stack perform
|
|
* checksum validation. The level is applicable to the following
|
|
* protocols: TCP, UDP, GRE, SCTP, FCOE. For example, a decap of
|
|
* | ETH | IP | UDP | GUE | IP | TCP | into | ETH | IP | TCP |
|
|
* through **bpf_skb_adjust_room**\ () helper with passing in
|
|
* **BPF_F_ADJ_ROOM_NO_CSUM_RESET** flag would require one call
|
|
* to **bpf_csum_level**\ () with **BPF_CSUM_LEVEL_DEC** since
|
|
* the UDP header is removed. Similarly, an encap of the latter
|
|
* into the former could be accompanied by a helper call to
|
|
* **bpf_csum_level**\ () with **BPF_CSUM_LEVEL_INC** if the
|
|
* skb is still intended to be processed in higher layers of the
|
|
* stack instead of just egressing at tc.
|
|
*
|
|
* There are three supported level settings at this time:
|
|
*
|
|
* * **BPF_CSUM_LEVEL_INC**: Increases skb->csum_level for skbs
|
|
* with CHECKSUM_UNNECESSARY.
|
|
* * **BPF_CSUM_LEVEL_DEC**: Decreases skb->csum_level for skbs
|
|
* with CHECKSUM_UNNECESSARY.
|
|
* * **BPF_CSUM_LEVEL_RESET**: Resets skb->csum_level to 0 and
|
|
* sets CHECKSUM_NONE to force checksum validation by the stack.
|
|
* * **BPF_CSUM_LEVEL_QUERY**: No-op, returns the current
|
|
* skb->csum_level.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure. In the
|
|
* case of **BPF_CSUM_LEVEL_QUERY**, the current skb->csum_level
|
|
* is returned or the error code -EACCES in case the skb is not
|
|
* subject to CHECKSUM_UNNECESSARY.
|
|
*
|
|
* struct tcp6_sock *bpf_skc_to_tcp6_sock(void *sk)
|
|
* Description
|
|
* Dynamically cast a *sk* pointer to a *tcp6_sock* pointer.
|
|
* Return
|
|
* *sk* if casting is valid, or **NULL** otherwise.
|
|
*
|
|
* struct tcp_sock *bpf_skc_to_tcp_sock(void *sk)
|
|
* Description
|
|
* Dynamically cast a *sk* pointer to a *tcp_sock* pointer.
|
|
* Return
|
|
* *sk* if casting is valid, or **NULL** otherwise.
|
|
*
|
|
* struct tcp_timewait_sock *bpf_skc_to_tcp_timewait_sock(void *sk)
|
|
* Description
|
|
* Dynamically cast a *sk* pointer to a *tcp_timewait_sock* pointer.
|
|
* Return
|
|
* *sk* if casting is valid, or **NULL** otherwise.
|
|
*
|
|
* struct tcp_request_sock *bpf_skc_to_tcp_request_sock(void *sk)
|
|
* Description
|
|
* Dynamically cast a *sk* pointer to a *tcp_request_sock* pointer.
|
|
* Return
|
|
* *sk* if casting is valid, or **NULL** otherwise.
|
|
*
|
|
* struct udp6_sock *bpf_skc_to_udp6_sock(void *sk)
|
|
* Description
|
|
* Dynamically cast a *sk* pointer to a *udp6_sock* pointer.
|
|
* Return
|
|
* *sk* if casting is valid, or **NULL** otherwise.
|
|
*
|
|
* long bpf_get_task_stack(struct task_struct *task, void *buf, u32 size, u64 flags)
|
|
* Description
|
|
* Return a user or a kernel stack in bpf program provided buffer.
|
|
* To achieve this, the helper needs *task*, which is a valid
|
|
* pointer to **struct task_struct**. To store the stacktrace, the
|
|
* bpf program provides *buf* with a nonnegative *size*.
|
|
*
|
|
* The last argument, *flags*, holds the number of stack frames to
|
|
* skip (from 0 to 255), masked with
|
|
* **BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set
|
|
* the following flags:
|
|
*
|
|
* **BPF_F_USER_STACK**
|
|
* Collect a user space stack instead of a kernel stack.
|
|
* **BPF_F_USER_BUILD_ID**
|
|
* Collect buildid+offset instead of ips for user stack,
|
|
* only valid if **BPF_F_USER_STACK** is also specified.
|
|
*
|
|
* **bpf_get_task_stack**\ () can collect up to
|
|
* **PERF_MAX_STACK_DEPTH** both kernel and user frames, subject
|
|
* to sufficient large buffer size. Note that
|
|
* this limit can be controlled with the **sysctl** program, and
|
|
* that it should be manually increased in order to profile long
|
|
* user stacks (such as stacks for Java programs). To do so, use:
|
|
*
|
|
* ::
|
|
*
|
|
* # sysctl kernel.perf_event_max_stack=<new value>
|
|
* Return
|
|
* The non-negative copied *buf* length equal to or less than
|
|
* *size* on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_load_hdr_opt(struct bpf_sock_ops *skops, void *searchby_res, u32 len, u64 flags)
|
|
* Description
|
|
* Load header option. Support reading a particular TCP header
|
|
* option for bpf program (**BPF_PROG_TYPE_SOCK_OPS**).
|
|
*
|
|
* If *flags* is 0, it will search the option from the
|
|
* *skops*\ **->skb_data**. The comment in **struct bpf_sock_ops**
|
|
* has details on what skb_data contains under different
|
|
* *skops*\ **->op**.
|
|
*
|
|
* The first byte of the *searchby_res* specifies the
|
|
* kind that it wants to search.
|
|
*
|
|
* If the searching kind is an experimental kind
|
|
* (i.e. 253 or 254 according to RFC6994). It also
|
|
* needs to specify the "magic" which is either
|
|
* 2 bytes or 4 bytes. It then also needs to
|
|
* specify the size of the magic by using
|
|
* the 2nd byte which is "kind-length" of a TCP
|
|
* header option and the "kind-length" also
|
|
* includes the first 2 bytes "kind" and "kind-length"
|
|
* itself as a normal TCP header option also does.
|
|
*
|
|
* For example, to search experimental kind 254 with
|
|
* 2 byte magic 0xeB9F, the searchby_res should be
|
|
* [ 254, 4, 0xeB, 0x9F, 0, 0, .... 0 ].
|
|
*
|
|
* To search for the standard window scale option (3),
|
|
* the *searchby_res* should be [ 3, 0, 0, .... 0 ].
|
|
* Note, kind-length must be 0 for regular option.
|
|
*
|
|
* Searching for No-Op (0) and End-of-Option-List (1) are
|
|
* not supported.
|
|
*
|
|
* *len* must be at least 2 bytes which is the minimal size
|
|
* of a header option.
|
|
*
|
|
* Supported flags:
|
|
*
|
|
* * **BPF_LOAD_HDR_OPT_TCP_SYN** to search from the
|
|
* saved_syn packet or the just-received syn packet.
|
|
*
|
|
* Return
|
|
* > 0 when found, the header option is copied to *searchby_res*.
|
|
* The return value is the total length copied. On failure, a
|
|
* negative error code is returned:
|
|
*
|
|
* **-EINVAL** if a parameter is invalid.
|
|
*
|
|
* **-ENOMSG** if the option is not found.
|
|
*
|
|
* **-ENOENT** if no syn packet is available when
|
|
* **BPF_LOAD_HDR_OPT_TCP_SYN** is used.
|
|
*
|
|
* **-ENOSPC** if there is not enough space. Only *len* number of
|
|
* bytes are copied.
|
|
*
|
|
* **-EFAULT** on failure to parse the header options in the
|
|
* packet.
|
|
*
|
|
* **-EPERM** if the helper cannot be used under the current
|
|
* *skops*\ **->op**.
|
|
*
|
|
* long bpf_store_hdr_opt(struct bpf_sock_ops *skops, const void *from, u32 len, u64 flags)
|
|
* Description
|
|
* Store header option. The data will be copied
|
|
* from buffer *from* with length *len* to the TCP header.
|
|
*
|
|
* The buffer *from* should have the whole option that
|
|
* includes the kind, kind-length, and the actual
|
|
* option data. The *len* must be at least kind-length
|
|
* long. The kind-length does not have to be 4 byte
|
|
* aligned. The kernel will take care of the padding
|
|
* and setting the 4 bytes aligned value to th->doff.
|
|
*
|
|
* This helper will check for duplicated option
|
|
* by searching the same option in the outgoing skb.
|
|
*
|
|
* This helper can only be called during
|
|
* **BPF_SOCK_OPS_WRITE_HDR_OPT_CB**.
|
|
*
|
|
* Return
|
|
* 0 on success, or negative error in case of failure:
|
|
*
|
|
* **-EINVAL** If param is invalid.
|
|
*
|
|
* **-ENOSPC** if there is not enough space in the header.
|
|
* Nothing has been written
|
|
*
|
|
* **-EEXIST** if the option already exists.
|
|
*
|
|
* **-EFAULT** on failure to parse the existing header options.
|
|
*
|
|
* **-EPERM** if the helper cannot be used under the current
|
|
* *skops*\ **->op**.
|
|
*
|
|
* long bpf_reserve_hdr_opt(struct bpf_sock_ops *skops, u32 len, u64 flags)
|
|
* Description
|
|
* Reserve *len* bytes for the bpf header option. The
|
|
* space will be used by **bpf_store_hdr_opt**\ () later in
|
|
* **BPF_SOCK_OPS_WRITE_HDR_OPT_CB**.
|
|
*
|
|
* If **bpf_reserve_hdr_opt**\ () is called multiple times,
|
|
* the total number of bytes will be reserved.
|
|
*
|
|
* This helper can only be called during
|
|
* **BPF_SOCK_OPS_HDR_OPT_LEN_CB**.
|
|
*
|
|
* Return
|
|
* 0 on success, or negative error in case of failure:
|
|
*
|
|
* **-EINVAL** if a parameter is invalid.
|
|
*
|
|
* **-ENOSPC** if there is not enough space in the header.
|
|
*
|
|
* **-EPERM** if the helper cannot be used under the current
|
|
* *skops*\ **->op**.
|
|
*
|
|
* void *bpf_inode_storage_get(struct bpf_map *map, void *inode, void *value, u64 flags)
|
|
* Description
|
|
* Get a bpf_local_storage from an *inode*.
|
|
*
|
|
* Logically, it could be thought of as getting the value from
|
|
* a *map* with *inode* as the **key**. From this
|
|
* perspective, the usage is not much different from
|
|
* **bpf_map_lookup_elem**\ (*map*, **&**\ *inode*) except this
|
|
* helper enforces the key must be an inode and the map must also
|
|
* be a **BPF_MAP_TYPE_INODE_STORAGE**.
|
|
*
|
|
* Underneath, the value is stored locally at *inode* instead of
|
|
* the *map*. The *map* is used as the bpf-local-storage
|
|
* "type". The bpf-local-storage "type" (i.e. the *map*) is
|
|
* searched against all bpf_local_storage residing at *inode*.
|
|
*
|
|
* An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
|
|
* used such that a new bpf_local_storage will be
|
|
* created if one does not exist. *value* can be used
|
|
* together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
|
|
* the initial value of a bpf_local_storage. If *value* is
|
|
* **NULL**, the new bpf_local_storage will be zero initialized.
|
|
* Return
|
|
* A bpf_local_storage pointer is returned on success.
|
|
*
|
|
* **NULL** if not found or there was an error in adding
|
|
* a new bpf_local_storage.
|
|
*
|
|
* int bpf_inode_storage_delete(struct bpf_map *map, void *inode)
|
|
* Description
|
|
* Delete a bpf_local_storage from an *inode*.
|
|
* Return
|
|
* 0 on success.
|
|
*
|
|
* **-ENOENT** if the bpf_local_storage cannot be found.
|
|
*
|
|
* long bpf_d_path(struct path *path, char *buf, u32 sz)
|
|
* Description
|
|
* Return full path for given **struct path** object, which
|
|
* needs to be the kernel BTF *path* object. The path is
|
|
* returned in the provided buffer *buf* of size *sz* and
|
|
* is zero terminated.
|
|
*
|
|
* Return
|
|
* On success, the strictly positive length of the string,
|
|
* including the trailing NUL character. On error, a negative
|
|
* value.
|
|
*
|
|
* long bpf_copy_from_user(void *dst, u32 size, const void *user_ptr)
|
|
* Description
|
|
* Read *size* bytes from user space address *user_ptr* and store
|
|
* the data in *dst*. This is a wrapper of **copy_from_user**\ ().
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_snprintf_btf(char *str, u32 str_size, struct btf_ptr *ptr, u32 btf_ptr_size, u64 flags)
|
|
* Description
|
|
* Use BTF to store a string representation of *ptr*->ptr in *str*,
|
|
* using *ptr*->type_id. This value should specify the type
|
|
* that *ptr*->ptr points to. LLVM __builtin_btf_type_id(type, 1)
|
|
* can be used to look up vmlinux BTF type ids. Traversing the
|
|
* data structure using BTF, the type information and values are
|
|
* stored in the first *str_size* - 1 bytes of *str*. Safe copy of
|
|
* the pointer data is carried out to avoid kernel crashes during
|
|
* operation. Smaller types can use string space on the stack;
|
|
* larger programs can use map data to store the string
|
|
* representation.
|
|
*
|
|
* The string can be subsequently shared with userspace via
|
|
* bpf_perf_event_output() or ring buffer interfaces.
|
|
* bpf_trace_printk() is to be avoided as it places too small
|
|
* a limit on string size to be useful.
|
|
*
|
|
* *flags* is a combination of
|
|
*
|
|
* **BTF_F_COMPACT**
|
|
* no formatting around type information
|
|
* **BTF_F_NONAME**
|
|
* no struct/union member names/types
|
|
* **BTF_F_PTR_RAW**
|
|
* show raw (unobfuscated) pointer values;
|
|
* equivalent to printk specifier %px.
|
|
* **BTF_F_ZERO**
|
|
* show zero-valued struct/union members; they
|
|
* are not displayed by default
|
|
*
|
|
* Return
|
|
* The number of bytes that were written (or would have been
|
|
* written if output had to be truncated due to string size),
|
|
* or a negative error in cases of failure.
|
|
*
|
|
* long bpf_seq_printf_btf(struct seq_file *m, struct btf_ptr *ptr, u32 ptr_size, u64 flags)
|
|
* Description
|
|
* Use BTF to write to seq_write a string representation of
|
|
* *ptr*->ptr, using *ptr*->type_id as per bpf_snprintf_btf().
|
|
* *flags* are identical to those used for bpf_snprintf_btf.
|
|
* Return
|
|
* 0 on success or a negative error in case of failure.
|
|
*
|
|
* u64 bpf_skb_cgroup_classid(struct sk_buff *skb)
|
|
* Description
|
|
* See **bpf_get_cgroup_classid**\ () for the main description.
|
|
* This helper differs from **bpf_get_cgroup_classid**\ () in that
|
|
* the cgroup v1 net_cls class is retrieved only from the *skb*'s
|
|
* associated socket instead of the current process.
|
|
* Return
|
|
* The id is returned or 0 in case the id could not be retrieved.
|
|
*
|
|
* long bpf_redirect_neigh(u32 ifindex, struct bpf_redir_neigh *params, int plen, u64 flags)
|
|
* Description
|
|
* Redirect the packet to another net device of index *ifindex*
|
|
* and fill in L2 addresses from neighboring subsystem. This helper
|
|
* is somewhat similar to **bpf_redirect**\ (), except that it
|
|
* populates L2 addresses as well, meaning, internally, the helper
|
|
* relies on the neighbor lookup for the L2 address of the nexthop.
|
|
*
|
|
* The helper will perform a FIB lookup based on the skb's
|
|
* networking header to get the address of the next hop, unless
|
|
* this is supplied by the caller in the *params* argument. The
|
|
* *plen* argument indicates the len of *params* and should be set
|
|
* to 0 if *params* is NULL.
|
|
*
|
|
* The *flags* argument is reserved and must be 0. The helper is
|
|
* currently only supported for tc BPF program types, and enabled
|
|
* for IPv4 and IPv6 protocols.
|
|
* Return
|
|
* The helper returns **TC_ACT_REDIRECT** on success or
|
|
* **TC_ACT_SHOT** on error.
|
|
*
|
|
* void *bpf_per_cpu_ptr(const void *percpu_ptr, u32 cpu)
|
|
* Description
|
|
* Take a pointer to a percpu ksym, *percpu_ptr*, and return a
|
|
* pointer to the percpu kernel variable on *cpu*. A ksym is an
|
|
* extern variable decorated with '__ksym'. For ksym, there is a
|
|
* global var (either static or global) defined of the same name
|
|
* in the kernel. The ksym is percpu if the global var is percpu.
|
|
* The returned pointer points to the global percpu var on *cpu*.
|
|
*
|
|
* bpf_per_cpu_ptr() has the same semantic as per_cpu_ptr() in the
|
|
* kernel, except that bpf_per_cpu_ptr() may return NULL. This
|
|
* happens if *cpu* is larger than nr_cpu_ids. The caller of
|
|
* bpf_per_cpu_ptr() must check the returned value.
|
|
* Return
|
|
* A pointer pointing to the kernel percpu variable on *cpu*, or
|
|
* NULL, if *cpu* is invalid.
|
|
*
|
|
* void *bpf_this_cpu_ptr(const void *percpu_ptr)
|
|
* Description
|
|
* Take a pointer to a percpu ksym, *percpu_ptr*, and return a
|
|
* pointer to the percpu kernel variable on this cpu. See the
|
|
* description of 'ksym' in **bpf_per_cpu_ptr**\ ().
|
|
*
|
|
* bpf_this_cpu_ptr() has the same semantic as this_cpu_ptr() in
|
|
* the kernel. Different from **bpf_per_cpu_ptr**\ (), it would
|
|
* never return NULL.
|
|
* Return
|
|
* A pointer pointing to the kernel percpu variable on this cpu.
|
|
*
|
|
* long bpf_redirect_peer(u32 ifindex, u64 flags)
|
|
* Description
|
|
* Redirect the packet to another net device of index *ifindex*.
|
|
* This helper is somewhat similar to **bpf_redirect**\ (), except
|
|
* that the redirection happens to the *ifindex*' peer device and
|
|
* the netns switch takes place from ingress to ingress without
|
|
* going through the CPU's backlog queue.
|
|
*
|
|
* The *flags* argument is reserved and must be 0. The helper is
|
|
* currently only supported for tc BPF program types at the ingress
|
|
* hook and for veth device types. The peer device must reside in a
|
|
* different network namespace.
|
|
* Return
|
|
* The helper returns **TC_ACT_REDIRECT** on success or
|
|
* **TC_ACT_SHOT** on error.
|
|
*
|
|
* void *bpf_task_storage_get(struct bpf_map *map, struct task_struct *task, void *value, u64 flags)
|
|
* Description
|
|
* Get a bpf_local_storage from the *task*.
|
|
*
|
|
* Logically, it could be thought of as getting the value from
|
|
* a *map* with *task* as the **key**. From this
|
|
* perspective, the usage is not much different from
|
|
* **bpf_map_lookup_elem**\ (*map*, **&**\ *task*) except this
|
|
* helper enforces the key must be a task_struct and the map must also
|
|
* be a **BPF_MAP_TYPE_TASK_STORAGE**.
|
|
*
|
|
* Underneath, the value is stored locally at *task* instead of
|
|
* the *map*. The *map* is used as the bpf-local-storage
|
|
* "type". The bpf-local-storage "type" (i.e. the *map*) is
|
|
* searched against all bpf_local_storage residing at *task*.
|
|
*
|
|
* An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
|
|
* used such that a new bpf_local_storage will be
|
|
* created if one does not exist. *value* can be used
|
|
* together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
|
|
* the initial value of a bpf_local_storage. If *value* is
|
|
* **NULL**, the new bpf_local_storage will be zero initialized.
|
|
* Return
|
|
* A bpf_local_storage pointer is returned on success.
|
|
*
|
|
* **NULL** if not found or there was an error in adding
|
|
* a new bpf_local_storage.
|
|
*
|
|
* long bpf_task_storage_delete(struct bpf_map *map, struct task_struct *task)
|
|
* Description
|
|
* Delete a bpf_local_storage from a *task*.
|
|
* Return
|
|
* 0 on success.
|
|
*
|
|
* **-ENOENT** if the bpf_local_storage cannot be found.
|
|
*
|
|
* struct task_struct *bpf_get_current_task_btf(void)
|
|
* Description
|
|
* Return a BTF pointer to the "current" task.
|
|
* This pointer can also be used in helpers that accept an
|
|
* *ARG_PTR_TO_BTF_ID* of type *task_struct*.
|
|
* Return
|
|
* Pointer to the current task.
|
|
*
|
|
* long bpf_bprm_opts_set(struct linux_binprm *bprm, u64 flags)
|
|
* Description
|
|
* Set or clear certain options on *bprm*:
|
|
*
|
|
* **BPF_F_BPRM_SECUREEXEC** Set the secureexec bit
|
|
* which sets the **AT_SECURE** auxv for glibc. The bit
|
|
* is cleared if the flag is not specified.
|
|
* Return
|
|
* **-EINVAL** if invalid *flags* are passed, zero otherwise.
|
|
*
|
|
* u64 bpf_ktime_get_coarse_ns(void)
|
|
* Description
|
|
* Return a coarse-grained version of the time elapsed since
|
|
* system boot, in nanoseconds. Does not include time the system
|
|
* was suspended.
|
|
*
|
|
* See: **clock_gettime**\ (**CLOCK_MONOTONIC_COARSE**)
|
|
* Return
|
|
* Current *ktime*.
|
|
*
|
|
* long bpf_ima_inode_hash(struct inode *inode, void *dst, u32 size)
|
|
* Description
|
|
* Returns the stored IMA hash of the *inode* (if it's available).
|
|
* If the hash is larger than *size*, then only *size*
|
|
* bytes will be copied to *dst*
|
|
* Return
|
|
* The **hash_algo** is returned on success,
|
|
* **-EOPNOTSUP** if IMA is disabled or **-EINVAL** if
|
|
* invalid arguments are passed.
|
|
*
|
|
* struct socket *bpf_sock_from_file(struct file *file)
|
|
* Description
|
|
* If the given file represents a socket, returns the associated
|
|
* socket.
|
|
* Return
|
|
* A pointer to a struct socket on success or NULL if the file is
|
|
* not a socket.
|
|
*
|
|
* long bpf_check_mtu(void *ctx, u32 ifindex, u32 *mtu_len, s32 len_diff, u64 flags)
|
|
* Description
|
|
* Check packet size against exceeding MTU of net device (based
|
|
* on *ifindex*). This helper will likely be used in combination
|
|
* with helpers that adjust/change the packet size.
|
|
*
|
|
* The argument *len_diff* can be used for querying with a planned
|
|
* size change. This allows to check MTU prior to changing packet
|
|
* ctx. Providing a *len_diff* adjustment that is larger than the
|
|
* actual packet size (resulting in negative packet size) will in
|
|
* principle not exceed the MTU, which is why it is not considered
|
|
* a failure. Other BPF helpers are needed for performing the
|
|
* planned size change; therefore the responsibility for catching
|
|
* a negative packet size belongs in those helpers.
|
|
*
|
|
* Specifying *ifindex* zero means the MTU check is performed
|
|
* against the current net device. This is practical if this isn't
|
|
* used prior to redirect.
|
|
*
|
|
* On input *mtu_len* must be a valid pointer, else verifier will
|
|
* reject BPF program. If the value *mtu_len* is initialized to
|
|
* zero then the ctx packet size is use. When value *mtu_len* is
|
|
* provided as input this specify the L3 length that the MTU check
|
|
* is done against. Remember XDP and TC length operate at L2, but
|
|
* this value is L3 as this correlate to MTU and IP-header tot_len
|
|
* values which are L3 (similar behavior as bpf_fib_lookup).
|
|
*
|
|
* The Linux kernel route table can configure MTUs on a more
|
|
* specific per route level, which is not provided by this helper.
|
|
* For route level MTU checks use the **bpf_fib_lookup**\ ()
|
|
* helper.
|
|
*
|
|
* *ctx* is either **struct xdp_md** for XDP programs or
|
|
* **struct sk_buff** for tc cls_act programs.
|
|
*
|
|
* The *flags* argument can be a combination of one or more of the
|
|
* following values:
|
|
*
|
|
* **BPF_MTU_CHK_SEGS**
|
|
* This flag will only works for *ctx* **struct sk_buff**.
|
|
* If packet context contains extra packet segment buffers
|
|
* (often knows as GSO skb), then MTU check is harder to
|
|
* check at this point, because in transmit path it is
|
|
* possible for the skb packet to get re-segmented
|
|
* (depending on net device features). This could still be
|
|
* a MTU violation, so this flag enables performing MTU
|
|
* check against segments, with a different violation
|
|
* return code to tell it apart. Check cannot use len_diff.
|
|
*
|
|
* On return *mtu_len* pointer contains the MTU value of the net
|
|
* device. Remember the net device configured MTU is the L3 size,
|
|
* which is returned here and XDP and TC length operate at L2.
|
|
* Helper take this into account for you, but remember when using
|
|
* MTU value in your BPF-code.
|
|
*
|
|
* Return
|
|
* * 0 on success, and populate MTU value in *mtu_len* pointer.
|
|
*
|
|
* * < 0 if any input argument is invalid (*mtu_len* not updated)
|
|
*
|
|
* MTU violations return positive values, but also populate MTU
|
|
* value in *mtu_len* pointer, as this can be needed for
|
|
* implementing PMTU handing:
|
|
*
|
|
* * **BPF_MTU_CHK_RET_FRAG_NEEDED**
|
|
* * **BPF_MTU_CHK_RET_SEGS_TOOBIG**
|
|
*
|
|
* long bpf_for_each_map_elem(struct bpf_map *map, void *callback_fn, void *callback_ctx, u64 flags)
|
|
* Description
|
|
* For each element in **map**, call **callback_fn** function with
|
|
* **map**, **callback_ctx** and other map-specific parameters.
|
|
* The **callback_fn** should be a static function and
|
|
* the **callback_ctx** should be a pointer to the stack.
|
|
* The **flags** is used to control certain aspects of the helper.
|
|
* Currently, the **flags** must be 0.
|
|
*
|
|
* The following are a list of supported map types and their
|
|
* respective expected callback signatures:
|
|
*
|
|
* BPF_MAP_TYPE_HASH, BPF_MAP_TYPE_PERCPU_HASH,
|
|
* BPF_MAP_TYPE_LRU_HASH, BPF_MAP_TYPE_LRU_PERCPU_HASH,
|
|
* BPF_MAP_TYPE_ARRAY, BPF_MAP_TYPE_PERCPU_ARRAY
|
|
*
|
|
* long (\*callback_fn)(struct bpf_map \*map, const void \*key, void \*value, void \*ctx);
|
|
*
|
|
* For per_cpu maps, the map_value is the value on the cpu where the
|
|
* bpf_prog is running.
|
|
*
|
|
* If **callback_fn** return 0, the helper will continue to the next
|
|
* element. If return value is 1, the helper will skip the rest of
|
|
* elements and return. Other return values are not used now.
|
|
*
|
|
* Return
|
|
* The number of traversed map elements for success, **-EINVAL** for
|
|
* invalid **flags**.
|
|
*
|
|
* long bpf_snprintf(char *str, u32 str_size, const char *fmt, u64 *data, u32 data_len)
|
|
* Description
|
|
* Outputs a string into the **str** buffer of size **str_size**
|
|
* based on a format string stored in a read-only map pointed by
|
|
* **fmt**.
|
|
*
|
|
* Each format specifier in **fmt** corresponds to one u64 element
|
|
* in the **data** array. For strings and pointers where pointees
|
|
* are accessed, only the pointer values are stored in the *data*
|
|
* array. The *data_len* is the size of *data* in bytes - must be
|
|
* a multiple of 8.
|
|
*
|
|
* Formats **%s** and **%p{i,I}{4,6}** require to read kernel
|
|
* memory. Reading kernel memory may fail due to either invalid
|
|
* address or valid address but requiring a major memory fault. If
|
|
* reading kernel memory fails, the string for **%s** will be an
|
|
* empty string, and the ip address for **%p{i,I}{4,6}** will be 0.
|
|
* Not returning error to bpf program is consistent with what
|
|
* **bpf_trace_printk**\ () does for now.
|
|
*
|
|
* Return
|
|
* The strictly positive length of the formatted string, including
|
|
* the trailing zero character. If the return value is greater than
|
|
* **str_size**, **str** contains a truncated string, guaranteed to
|
|
* be zero-terminated except when **str_size** is 0.
|
|
*
|
|
* Or **-EBUSY** if the per-CPU memory copy buffer is busy.
|
|
*
|
|
* long bpf_sys_bpf(u32 cmd, void *attr, u32 attr_size)
|
|
* Description
|
|
* Execute bpf syscall with given arguments.
|
|
* Return
|
|
* A syscall result.
|
|
*
|
|
* long bpf_btf_find_by_name_kind(char *name, int name_sz, u32 kind, int flags)
|
|
* Description
|
|
* Find BTF type with given name and kind in vmlinux BTF or in module's BTFs.
|
|
* Return
|
|
* Returns btf_id and btf_obj_fd in lower and upper 32 bits.
|
|
*
|
|
* long bpf_sys_close(u32 fd)
|
|
* Description
|
|
* Execute close syscall for given FD.
|
|
* Return
|
|
* A syscall result.
|
|
*
|
|
* long bpf_timer_init(struct bpf_timer *timer, struct bpf_map *map, u64 flags)
|
|
* Description
|
|
* Initialize the timer.
|
|
* First 4 bits of *flags* specify clockid.
|
|
* Only CLOCK_MONOTONIC, CLOCK_REALTIME, CLOCK_BOOTTIME are allowed.
|
|
* All other bits of *flags* are reserved.
|
|
* The verifier will reject the program if *timer* is not from
|
|
* the same *map*.
|
|
* Return
|
|
* 0 on success.
|
|
* **-EBUSY** if *timer* is already initialized.
|
|
* **-EINVAL** if invalid *flags* are passed.
|
|
* **-EPERM** if *timer* is in a map that doesn't have any user references.
|
|
* The user space should either hold a file descriptor to a map with timers
|
|
* or pin such map in bpffs. When map is unpinned or file descriptor is
|
|
* closed all timers in the map will be cancelled and freed.
|
|
*
|
|
* long bpf_timer_set_callback(struct bpf_timer *timer, void *callback_fn)
|
|
* Description
|
|
* Configure the timer to call *callback_fn* static function.
|
|
* Return
|
|
* 0 on success.
|
|
* **-EINVAL** if *timer* was not initialized with bpf_timer_init() earlier.
|
|
* **-EPERM** if *timer* is in a map that doesn't have any user references.
|
|
* The user space should either hold a file descriptor to a map with timers
|
|
* or pin such map in bpffs. When map is unpinned or file descriptor is
|
|
* closed all timers in the map will be cancelled and freed.
|
|
*
|
|
* long bpf_timer_start(struct bpf_timer *timer, u64 nsecs, u64 flags)
|
|
* Description
|
|
* Set timer expiration N nanoseconds from the current time. The
|
|
* configured callback will be invoked in soft irq context on some cpu
|
|
* and will not repeat unless another bpf_timer_start() is made.
|
|
* In such case the next invocation can migrate to a different cpu.
|
|
* Since struct bpf_timer is a field inside map element the map
|
|
* owns the timer. The bpf_timer_set_callback() will increment refcnt
|
|
* of BPF program to make sure that callback_fn code stays valid.
|
|
* When user space reference to a map reaches zero all timers
|
|
* in a map are cancelled and corresponding program's refcnts are
|
|
* decremented. This is done to make sure that Ctrl-C of a user
|
|
* process doesn't leave any timers running. If map is pinned in
|
|
* bpffs the callback_fn can re-arm itself indefinitely.
|
|
* bpf_map_update/delete_elem() helpers and user space sys_bpf commands
|
|
* cancel and free the timer in the given map element.
|
|
* The map can contain timers that invoke callback_fn-s from different
|
|
* programs. The same callback_fn can serve different timers from
|
|
* different maps if key/value layout matches across maps.
|
|
* Every bpf_timer_set_callback() can have different callback_fn.
|
|
*
|
|
* *flags* can be one of:
|
|
*
|
|
* **BPF_F_TIMER_ABS**
|
|
* Start the timer in absolute expire value instead of the
|
|
* default relative one.
|
|
*
|
|
* Return
|
|
* 0 on success.
|
|
* **-EINVAL** if *timer* was not initialized with bpf_timer_init() earlier
|
|
* or invalid *flags* are passed.
|
|
*
|
|
* long bpf_timer_cancel(struct bpf_timer *timer)
|
|
* Description
|
|
* Cancel the timer and wait for callback_fn to finish if it was running.
|
|
* Return
|
|
* 0 if the timer was not active.
|
|
* 1 if the timer was active.
|
|
* **-EINVAL** if *timer* was not initialized with bpf_timer_init() earlier.
|
|
* **-EDEADLK** if callback_fn tried to call bpf_timer_cancel() on its
|
|
* own timer which would have led to a deadlock otherwise.
|
|
*
|
|
* u64 bpf_get_func_ip(void *ctx)
|
|
* Description
|
|
* Get address of the traced function (for tracing and kprobe programs).
|
|
* Return
|
|
* Address of the traced function.
|
|
* 0 for kprobes placed within the function (not at the entry).
|
|
*
|
|
* u64 bpf_get_attach_cookie(void *ctx)
|
|
* Description
|
|
* Get bpf_cookie value provided (optionally) during the program
|
|
* attachment. It might be different for each individual
|
|
* attachment, even if BPF program itself is the same.
|
|
* Expects BPF program context *ctx* as a first argument.
|
|
*
|
|
* Supported for the following program types:
|
|
* - kprobe/uprobe;
|
|
* - tracepoint;
|
|
* - perf_event.
|
|
* Return
|
|
* Value specified by user at BPF link creation/attachment time
|
|
* or 0, if it was not specified.
|
|
*
|
|
* long bpf_task_pt_regs(struct task_struct *task)
|
|
* Description
|
|
* Get the struct pt_regs associated with **task**.
|
|
* Return
|
|
* A pointer to struct pt_regs.
|
|
*
|
|
* long bpf_get_branch_snapshot(void *entries, u32 size, u64 flags)
|
|
* Description
|
|
* Get branch trace from hardware engines like Intel LBR. The
|
|
* hardware engine is stopped shortly after the helper is
|
|
* called. Therefore, the user need to filter branch entries
|
|
* based on the actual use case. To capture branch trace
|
|
* before the trigger point of the BPF program, the helper
|
|
* should be called at the beginning of the BPF program.
|
|
*
|
|
* The data is stored as struct perf_branch_entry into output
|
|
* buffer *entries*. *size* is the size of *entries* in bytes.
|
|
* *flags* is reserved for now and must be zero.
|
|
*
|
|
* Return
|
|
* On success, number of bytes written to *buf*. On error, a
|
|
* negative value.
|
|
*
|
|
* **-EINVAL** if *flags* is not zero.
|
|
*
|
|
* **-ENOENT** if architecture does not support branch records.
|
|
*
|
|
* long bpf_trace_vprintk(const char *fmt, u32 fmt_size, const void *data, u32 data_len)
|
|
* Description
|
|
* Behaves like **bpf_trace_printk**\ () helper, but takes an array of u64
|
|
* to format and can handle more format args as a result.
|
|
*
|
|
* Arguments are to be used as in **bpf_seq_printf**\ () helper.
|
|
* Return
|
|
* The number of bytes written to the buffer, or a negative error
|
|
* in case of failure.
|
|
*
|
|
* struct unix_sock *bpf_skc_to_unix_sock(void *sk)
|
|
* Description
|
|
* Dynamically cast a *sk* pointer to a *unix_sock* pointer.
|
|
* Return
|
|
* *sk* if casting is valid, or **NULL** otherwise.
|
|
*
|
|
* long bpf_kallsyms_lookup_name(const char *name, int name_sz, int flags, u64 *res)
|
|
* Description
|
|
* Get the address of a kernel symbol, returned in *res*. *res* is
|
|
* set to 0 if the symbol is not found.
|
|
* Return
|
|
* On success, zero. On error, a negative value.
|
|
*
|
|
* **-EINVAL** if *flags* is not zero.
|
|
*
|
|
* **-EINVAL** if string *name* is not the same size as *name_sz*.
|
|
*
|
|
* **-ENOENT** if symbol is not found.
|
|
*
|
|
* **-EPERM** if caller does not have permission to obtain kernel address.
|
|
*
|
|
* long bpf_find_vma(struct task_struct *task, u64 addr, void *callback_fn, void *callback_ctx, u64 flags)
|
|
* Description
|
|
* Find vma of *task* that contains *addr*, call *callback_fn*
|
|
* function with *task*, *vma*, and *callback_ctx*.
|
|
* The *callback_fn* should be a static function and
|
|
* the *callback_ctx* should be a pointer to the stack.
|
|
* The *flags* is used to control certain aspects of the helper.
|
|
* Currently, the *flags* must be 0.
|
|
*
|
|
* The expected callback signature is
|
|
*
|
|
* long (\*callback_fn)(struct task_struct \*task, struct vm_area_struct \*vma, void \*callback_ctx);
|
|
*
|
|
* Return
|
|
* 0 on success.
|
|
* **-ENOENT** if *task->mm* is NULL, or no vma contains *addr*.
|
|
* **-EBUSY** if failed to try lock mmap_lock.
|
|
* **-EINVAL** for invalid **flags**.
|
|
*
|
|
* long bpf_loop(u32 nr_loops, void *callback_fn, void *callback_ctx, u64 flags)
|
|
* Description
|
|
* For **nr_loops**, call **callback_fn** function
|
|
* with **callback_ctx** as the context parameter.
|
|
* The **callback_fn** should be a static function and
|
|
* the **callback_ctx** should be a pointer to the stack.
|
|
* The **flags** is used to control certain aspects of the helper.
|
|
* Currently, the **flags** must be 0. Currently, nr_loops is
|
|
* limited to 1 << 23 (~8 million) loops.
|
|
*
|
|
* long (\*callback_fn)(u32 index, void \*ctx);
|
|
*
|
|
* where **index** is the current index in the loop. The index
|
|
* is zero-indexed.
|
|
*
|
|
* If **callback_fn** returns 0, the helper will continue to the next
|
|
* loop. If return value is 1, the helper will skip the rest of
|
|
* the loops and return. Other return values are not used now,
|
|
* and will be rejected by the verifier.
|
|
*
|
|
* Return
|
|
* The number of loops performed, **-EINVAL** for invalid **flags**,
|
|
* **-E2BIG** if **nr_loops** exceeds the maximum number of loops.
|
|
*
|
|
* long bpf_strncmp(const char *s1, u32 s1_sz, const char *s2)
|
|
* Description
|
|
* Do strncmp() between **s1** and **s2**. **s1** doesn't need
|
|
* to be null-terminated and **s1_sz** is the maximum storage
|
|
* size of **s1**. **s2** must be a read-only string.
|
|
* Return
|
|
* An integer less than, equal to, or greater than zero
|
|
* if the first **s1_sz** bytes of **s1** is found to be
|
|
* less than, to match, or be greater than **s2**.
|
|
*
|
|
* long bpf_get_func_arg(void *ctx, u32 n, u64 *value)
|
|
* Description
|
|
* Get **n**-th argument register (zero based) of the traced function (for tracing programs)
|
|
* returned in **value**.
|
|
*
|
|
* Return
|
|
* 0 on success.
|
|
* **-EINVAL** if n >= argument register count of traced function.
|
|
*
|
|
* long bpf_get_func_ret(void *ctx, u64 *value)
|
|
* Description
|
|
* Get return value of the traced function (for tracing programs)
|
|
* in **value**.
|
|
*
|
|
* Return
|
|
* 0 on success.
|
|
* **-EOPNOTSUPP** for tracing programs other than BPF_TRACE_FEXIT or BPF_MODIFY_RETURN.
|
|
*
|
|
* long bpf_get_func_arg_cnt(void *ctx)
|
|
* Description
|
|
* Get number of registers of the traced function (for tracing programs) where
|
|
* function arguments are stored in these registers.
|
|
*
|
|
* Return
|
|
* The number of argument registers of the traced function.
|
|
*
|
|
* int bpf_get_retval(void)
|
|
* Description
|
|
* Get the BPF program's return value that will be returned to the upper layers.
|
|
*
|
|
* This helper is currently supported by cgroup programs and only by the hooks
|
|
* where BPF program's return value is returned to the userspace via errno.
|
|
* Return
|
|
* The BPF program's return value.
|
|
*
|
|
* int bpf_set_retval(int retval)
|
|
* Description
|
|
* Set the BPF program's return value that will be returned to the upper layers.
|
|
*
|
|
* This helper is currently supported by cgroup programs and only by the hooks
|
|
* where BPF program's return value is returned to the userspace via errno.
|
|
*
|
|
* Note that there is the following corner case where the program exports an error
|
|
* via bpf_set_retval but signals success via 'return 1':
|
|
*
|
|
* bpf_set_retval(-EPERM);
|
|
* return 1;
|
|
*
|
|
* In this case, the BPF program's return value will use helper's -EPERM. This
|
|
* still holds true for cgroup/bind{4,6} which supports extra 'return 3' success case.
|
|
*
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* u64 bpf_xdp_get_buff_len(struct xdp_buff *xdp_md)
|
|
* Description
|
|
* Get the total size of a given xdp buff (linear and paged area)
|
|
* Return
|
|
* The total size of a given xdp buffer.
|
|
*
|
|
* long bpf_xdp_load_bytes(struct xdp_buff *xdp_md, u32 offset, void *buf, u32 len)
|
|
* Description
|
|
* This helper is provided as an easy way to load data from a
|
|
* xdp buffer. It can be used to load *len* bytes from *offset* from
|
|
* the frame associated to *xdp_md*, into the buffer pointed by
|
|
* *buf*.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_xdp_store_bytes(struct xdp_buff *xdp_md, u32 offset, void *buf, u32 len)
|
|
* Description
|
|
* Store *len* bytes from buffer *buf* into the frame
|
|
* associated to *xdp_md*, at *offset*.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* long bpf_copy_from_user_task(void *dst, u32 size, const void *user_ptr, struct task_struct *tsk, u64 flags)
|
|
* Description
|
|
* Read *size* bytes from user space address *user_ptr* in *tsk*'s
|
|
* address space, and stores the data in *dst*. *flags* is not
|
|
* used yet and is provided for future extensibility. This helper
|
|
* can only be used by sleepable programs.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure. On error
|
|
* *dst* buffer is zeroed out.
|
|
*
|
|
* long bpf_skb_set_tstamp(struct sk_buff *skb, u64 tstamp, u32 tstamp_type)
|
|
* Description
|
|
* Change the __sk_buff->tstamp_type to *tstamp_type*
|
|
* and set *tstamp* to the __sk_buff->tstamp together.
|
|
*
|
|
* If there is no need to change the __sk_buff->tstamp_type,
|
|
* the tstamp value can be directly written to __sk_buff->tstamp
|
|
* instead.
|
|
*
|
|
* BPF_SKB_TSTAMP_DELIVERY_MONO is the only tstamp that
|
|
* will be kept during bpf_redirect_*(). A non zero
|
|
* *tstamp* must be used with the BPF_SKB_TSTAMP_DELIVERY_MONO
|
|
* *tstamp_type*.
|
|
*
|
|
* A BPF_SKB_TSTAMP_UNSPEC *tstamp_type* can only be used
|
|
* with a zero *tstamp*.
|
|
*
|
|
* Only IPv4 and IPv6 skb->protocol are supported.
|
|
*
|
|
* This function is most useful when it needs to set a
|
|
* mono delivery time to __sk_buff->tstamp and then
|
|
* bpf_redirect_*() to the egress of an iface. For example,
|
|
* changing the (rcv) timestamp in __sk_buff->tstamp at
|
|
* ingress to a mono delivery time and then bpf_redirect_*()
|
|
* to sch_fq@phy-dev.
|
|
* Return
|
|
* 0 on success.
|
|
* **-EINVAL** for invalid input
|
|
* **-EOPNOTSUPP** for unsupported protocol
|
|
*
|
|
* long bpf_ima_file_hash(struct file *file, void *dst, u32 size)
|
|
* Description
|
|
* Returns a calculated IMA hash of the *file*.
|
|
* If the hash is larger than *size*, then only *size*
|
|
* bytes will be copied to *dst*
|
|
* Return
|
|
* The **hash_algo** is returned on success,
|
|
* **-EOPNOTSUP** if the hash calculation failed or **-EINVAL** if
|
|
* invalid arguments are passed.
|
|
*
|
|
* void *bpf_kptr_xchg(void *map_value, void *ptr)
|
|
* Description
|
|
* Exchange kptr at pointer *map_value* with *ptr*, and return the
|
|
* old value. *ptr* can be NULL, otherwise it must be a referenced
|
|
* pointer which will be released when this helper is called.
|
|
* Return
|
|
* The old value of kptr (which can be NULL). The returned pointer
|
|
* if not NULL, is a reference which must be released using its
|
|
* corresponding release function, or moved into a BPF map before
|
|
* program exit.
|
|
*
|
|
* void *bpf_map_lookup_percpu_elem(struct bpf_map *map, const void *key, u32 cpu)
|
|
* Description
|
|
* Perform a lookup in *percpu map* for an entry associated to
|
|
* *key* on *cpu*.
|
|
* Return
|
|
* Map value associated to *key* on *cpu*, or **NULL** if no entry
|
|
* was found or *cpu* is invalid.
|
|
*
|
|
* struct mptcp_sock *bpf_skc_to_mptcp_sock(void *sk)
|
|
* Description
|
|
* Dynamically cast a *sk* pointer to a *mptcp_sock* pointer.
|
|
* Return
|
|
* *sk* if casting is valid, or **NULL** otherwise.
|
|
*
|
|
* long bpf_dynptr_from_mem(void *data, u32 size, u64 flags, struct bpf_dynptr *ptr)
|
|
* Description
|
|
* Get a dynptr to local memory *data*.
|
|
*
|
|
* *data* must be a ptr to a map value.
|
|
* The maximum *size* supported is DYNPTR_MAX_SIZE.
|
|
* *flags* is currently unused.
|
|
* Return
|
|
* 0 on success, -E2BIG if the size exceeds DYNPTR_MAX_SIZE,
|
|
* -EINVAL if flags is not 0.
|
|
*
|
|
* long bpf_ringbuf_reserve_dynptr(void *ringbuf, u32 size, u64 flags, struct bpf_dynptr *ptr)
|
|
* Description
|
|
* Reserve *size* bytes of payload in a ring buffer *ringbuf*
|
|
* through the dynptr interface. *flags* must be 0.
|
|
*
|
|
* Please note that a corresponding bpf_ringbuf_submit_dynptr or
|
|
* bpf_ringbuf_discard_dynptr must be called on *ptr*, even if the
|
|
* reservation fails. This is enforced by the verifier.
|
|
* Return
|
|
* 0 on success, or a negative error in case of failure.
|
|
*
|
|
* void bpf_ringbuf_submit_dynptr(struct bpf_dynptr *ptr, u64 flags)
|
|
* Description
|
|
* Submit reserved ring buffer sample, pointed to by *data*,
|
|
* through the dynptr interface. This is a no-op if the dynptr is
|
|
* invalid/null.
|
|
*
|
|
* For more information on *flags*, please see
|
|
* 'bpf_ringbuf_submit'.
|
|
* Return
|
|
* Nothing. Always succeeds.
|
|
*
|
|
* void bpf_ringbuf_discard_dynptr(struct bpf_dynptr *ptr, u64 flags)
|
|
* Description
|
|
* Discard reserved ring buffer sample through the dynptr
|
|
* interface. This is a no-op if the dynptr is invalid/null.
|
|
*
|
|
* For more information on *flags*, please see
|
|
* 'bpf_ringbuf_discard'.
|
|
* Return
|
|
* Nothing. Always succeeds.
|
|
*
|
|
* long bpf_dynptr_read(void *dst, u32 len, const struct bpf_dynptr *src, u32 offset, u64 flags)
|
|
* Description
|
|
* Read *len* bytes from *src* into *dst*, starting from *offset*
|
|
* into *src*.
|
|
* *flags* is currently unused.
|
|
* Return
|
|
* 0 on success, -E2BIG if *offset* + *len* exceeds the length
|
|
* of *src*'s data, -EINVAL if *src* is an invalid dynptr or if
|
|
* *flags* is not 0.
|
|
*
|
|
* long bpf_dynptr_write(const struct bpf_dynptr *dst, u32 offset, void *src, u32 len, u64 flags)
|
|
* Description
|
|
* Write *len* bytes from *src* into *dst*, starting from *offset*
|
|
* into *dst*.
|
|
*
|
|
* *flags* must be 0 except for skb-type dynptrs.
|
|
*
|
|
* For skb-type dynptrs:
|
|
* * All data slices of the dynptr are automatically
|
|
* invalidated after **bpf_dynptr_write**\ (). This is
|
|
* because writing may pull the skb and change the
|
|
* underlying packet buffer.
|
|
*
|
|
* * For *flags*, please see the flags accepted by
|
|
* **bpf_skb_store_bytes**\ ().
|
|
* Return
|
|
* 0 on success, -E2BIG if *offset* + *len* exceeds the length
|
|
* of *dst*'s data, -EINVAL if *dst* is an invalid dynptr or if *dst*
|
|
* is a read-only dynptr or if *flags* is not correct. For skb-type dynptrs,
|
|
* other errors correspond to errors returned by **bpf_skb_store_bytes**\ ().
|
|
*
|
|
* void *bpf_dynptr_data(const struct bpf_dynptr *ptr, u32 offset, u32 len)
|
|
* Description
|
|
* Get a pointer to the underlying dynptr data.
|
|
*
|
|
* *len* must be a statically known value. The returned data slice
|
|
* is invalidated whenever the dynptr is invalidated.
|
|
*
|
|
* skb and xdp type dynptrs may not use bpf_dynptr_data. They should
|
|
* instead use bpf_dynptr_slice and bpf_dynptr_slice_rdwr.
|
|
* Return
|
|
* Pointer to the underlying dynptr data, NULL if the dynptr is
|
|
* read-only, if the dynptr is invalid, or if the offset and length
|
|
* is out of bounds.
|
|
*
|
|
* s64 bpf_tcp_raw_gen_syncookie_ipv4(struct iphdr *iph, struct tcphdr *th, u32 th_len)
|
|
* Description
|
|
* Try to issue a SYN cookie for the packet with corresponding
|
|
* IPv4/TCP headers, *iph* and *th*, without depending on a
|
|
* listening socket.
|
|
*
|
|
* *iph* points to the IPv4 header.
|
|
*
|
|
* *th* points to the start of the TCP header, while *th_len*
|
|
* contains the length of the TCP header (at least
|
|
* **sizeof**\ (**struct tcphdr**)).
|
|
* Return
|
|
* On success, lower 32 bits hold the generated SYN cookie in
|
|
* followed by 16 bits which hold the MSS value for that cookie,
|
|
* and the top 16 bits are unused.
|
|
*
|
|
* On failure, the returned value is one of the following:
|
|
*
|
|
* **-EINVAL** if *th_len* is invalid.
|
|
*
|
|
* s64 bpf_tcp_raw_gen_syncookie_ipv6(struct ipv6hdr *iph, struct tcphdr *th, u32 th_len)
|
|
* Description
|
|
* Try to issue a SYN cookie for the packet with corresponding
|
|
* IPv6/TCP headers, *iph* and *th*, without depending on a
|
|
* listening socket.
|
|
*
|
|
* *iph* points to the IPv6 header.
|
|
*
|
|
* *th* points to the start of the TCP header, while *th_len*
|
|
* contains the length of the TCP header (at least
|
|
* **sizeof**\ (**struct tcphdr**)).
|
|
* Return
|
|
* On success, lower 32 bits hold the generated SYN cookie in
|
|
* followed by 16 bits which hold the MSS value for that cookie,
|
|
* and the top 16 bits are unused.
|
|
*
|
|
* On failure, the returned value is one of the following:
|
|
*
|
|
* **-EINVAL** if *th_len* is invalid.
|
|
*
|
|
* **-EPROTONOSUPPORT** if CONFIG_IPV6 is not builtin.
|
|
*
|
|
* long bpf_tcp_raw_check_syncookie_ipv4(struct iphdr *iph, struct tcphdr *th)
|
|
* Description
|
|
* Check whether *iph* and *th* contain a valid SYN cookie ACK
|
|
* without depending on a listening socket.
|
|
*
|
|
* *iph* points to the IPv4 header.
|
|
*
|
|
* *th* points to the TCP header.
|
|
* Return
|
|
* 0 if *iph* and *th* are a valid SYN cookie ACK.
|
|
*
|
|
* On failure, the returned value is one of the following:
|
|
*
|
|
* **-EACCES** if the SYN cookie is not valid.
|
|
*
|
|
* long bpf_tcp_raw_check_syncookie_ipv6(struct ipv6hdr *iph, struct tcphdr *th)
|
|
* Description
|
|
* Check whether *iph* and *th* contain a valid SYN cookie ACK
|
|
* without depending on a listening socket.
|
|
*
|
|
* *iph* points to the IPv6 header.
|
|
*
|
|
* *th* points to the TCP header.
|
|
* Return
|
|
* 0 if *iph* and *th* are a valid SYN cookie ACK.
|
|
*
|
|
* On failure, the returned value is one of the following:
|
|
*
|
|
* **-EACCES** if the SYN cookie is not valid.
|
|
*
|
|
* **-EPROTONOSUPPORT** if CONFIG_IPV6 is not builtin.
|
|
*
|
|
* u64 bpf_ktime_get_tai_ns(void)
|
|
* Description
|
|
* A nonsettable system-wide clock derived from wall-clock time but
|
|
* ignoring leap seconds. This clock does not experience
|
|
* discontinuities and backwards jumps caused by NTP inserting leap
|
|
* seconds as CLOCK_REALTIME does.
|
|
*
|
|
* See: **clock_gettime**\ (**CLOCK_TAI**)
|
|
* Return
|
|
* Current *ktime*.
|
|
*
|
|
* long bpf_user_ringbuf_drain(struct bpf_map *map, void *callback_fn, void *ctx, u64 flags)
|
|
* Description
|
|
* Drain samples from the specified user ring buffer, and invoke
|
|
* the provided callback for each such sample:
|
|
*
|
|
* long (\*callback_fn)(const struct bpf_dynptr \*dynptr, void \*ctx);
|
|
*
|
|
* If **callback_fn** returns 0, the helper will continue to try
|
|
* and drain the next sample, up to a maximum of
|
|
* BPF_MAX_USER_RINGBUF_SAMPLES samples. If the return value is 1,
|
|
* the helper will skip the rest of the samples and return. Other
|
|
* return values are not used now, and will be rejected by the
|
|
* verifier.
|
|
* Return
|
|
* The number of drained samples if no error was encountered while
|
|
* draining samples, or 0 if no samples were present in the ring
|
|
* buffer. If a user-space producer was epoll-waiting on this map,
|
|
* and at least one sample was drained, they will receive an event
|
|
* notification notifying them of available space in the ring
|
|
* buffer. If the BPF_RB_NO_WAKEUP flag is passed to this
|
|
* function, no wakeup notification will be sent. If the
|
|
* BPF_RB_FORCE_WAKEUP flag is passed, a wakeup notification will
|
|
* be sent even if no sample was drained.
|
|
*
|
|
* On failure, the returned value is one of the following:
|
|
*
|
|
* **-EBUSY** if the ring buffer is contended, and another calling
|
|
* context was concurrently draining the ring buffer.
|
|
*
|
|
* **-EINVAL** if user-space is not properly tracking the ring
|
|
* buffer due to the producer position not being aligned to 8
|
|
* bytes, a sample not being aligned to 8 bytes, or the producer
|
|
* position not matching the advertised length of a sample.
|
|
*
|
|
* **-E2BIG** if user-space has tried to publish a sample which is
|
|
* larger than the size of the ring buffer, or which cannot fit
|
|
* within a struct bpf_dynptr.
|
|
*
|
|
* void *bpf_cgrp_storage_get(struct bpf_map *map, struct cgroup *cgroup, void *value, u64 flags)
|
|
* Description
|
|
* Get a bpf_local_storage from the *cgroup*.
|
|
*
|
|
* Logically, it could be thought of as getting the value from
|
|
* a *map* with *cgroup* as the **key**. From this
|
|
* perspective, the usage is not much different from
|
|
* **bpf_map_lookup_elem**\ (*map*, **&**\ *cgroup*) except this
|
|
* helper enforces the key must be a cgroup struct and the map must also
|
|
* be a **BPF_MAP_TYPE_CGRP_STORAGE**.
|
|
*
|
|
* In reality, the local-storage value is embedded directly inside of the
|
|
* *cgroup* object itself, rather than being located in the
|
|
* **BPF_MAP_TYPE_CGRP_STORAGE** map. When the local-storage value is
|
|
* queried for some *map* on a *cgroup* object, the kernel will perform an
|
|
* O(n) iteration over all of the live local-storage values for that
|
|
* *cgroup* object until the local-storage value for the *map* is found.
|
|
*
|
|
* An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
|
|
* used such that a new bpf_local_storage will be
|
|
* created if one does not exist. *value* can be used
|
|
* together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
|
|
* the initial value of a bpf_local_storage. If *value* is
|
|
* **NULL**, the new bpf_local_storage will be zero initialized.
|
|
* Return
|
|
* A bpf_local_storage pointer is returned on success.
|
|
*
|
|
* **NULL** if not found or there was an error in adding
|
|
* a new bpf_local_storage.
|
|
*
|
|
* long bpf_cgrp_storage_delete(struct bpf_map *map, struct cgroup *cgroup)
|
|
* Description
|
|
* Delete a bpf_local_storage from a *cgroup*.
|
|
* Return
|
|
* 0 on success.
|
|
*
|
|
* **-ENOENT** if the bpf_local_storage cannot be found.
|
|
*/
|
|
#define ___BPF_FUNC_MAPPER(FN, ctx...) \
|
|
FN(unspec, 0, ##ctx) \
|
|
FN(map_lookup_elem, 1, ##ctx) \
|
|
FN(map_update_elem, 2, ##ctx) \
|
|
FN(map_delete_elem, 3, ##ctx) \
|
|
FN(probe_read, 4, ##ctx) \
|
|
FN(ktime_get_ns, 5, ##ctx) \
|
|
FN(trace_printk, 6, ##ctx) \
|
|
FN(get_prandom_u32, 7, ##ctx) \
|
|
FN(get_smp_processor_id, 8, ##ctx) \
|
|
FN(skb_store_bytes, 9, ##ctx) \
|
|
FN(l3_csum_replace, 10, ##ctx) \
|
|
FN(l4_csum_replace, 11, ##ctx) \
|
|
FN(tail_call, 12, ##ctx) \
|
|
FN(clone_redirect, 13, ##ctx) \
|
|
FN(get_current_pid_tgid, 14, ##ctx) \
|
|
FN(get_current_uid_gid, 15, ##ctx) \
|
|
FN(get_current_comm, 16, ##ctx) \
|
|
FN(get_cgroup_classid, 17, ##ctx) \
|
|
FN(skb_vlan_push, 18, ##ctx) \
|
|
FN(skb_vlan_pop, 19, ##ctx) \
|
|
FN(skb_get_tunnel_key, 20, ##ctx) \
|
|
FN(skb_set_tunnel_key, 21, ##ctx) \
|
|
FN(perf_event_read, 22, ##ctx) \
|
|
FN(redirect, 23, ##ctx) \
|
|
FN(get_route_realm, 24, ##ctx) \
|
|
FN(perf_event_output, 25, ##ctx) \
|
|
FN(skb_load_bytes, 26, ##ctx) \
|
|
FN(get_stackid, 27, ##ctx) \
|
|
FN(csum_diff, 28, ##ctx) \
|
|
FN(skb_get_tunnel_opt, 29, ##ctx) \
|
|
FN(skb_set_tunnel_opt, 30, ##ctx) \
|
|
FN(skb_change_proto, 31, ##ctx) \
|
|
FN(skb_change_type, 32, ##ctx) \
|
|
FN(skb_under_cgroup, 33, ##ctx) \
|
|
FN(get_hash_recalc, 34, ##ctx) \
|
|
FN(get_current_task, 35, ##ctx) \
|
|
FN(probe_write_user, 36, ##ctx) \
|
|
FN(current_task_under_cgroup, 37, ##ctx) \
|
|
FN(skb_change_tail, 38, ##ctx) \
|
|
FN(skb_pull_data, 39, ##ctx) \
|
|
FN(csum_update, 40, ##ctx) \
|
|
FN(set_hash_invalid, 41, ##ctx) \
|
|
FN(get_numa_node_id, 42, ##ctx) \
|
|
FN(skb_change_head, 43, ##ctx) \
|
|
FN(xdp_adjust_head, 44, ##ctx) \
|
|
FN(probe_read_str, 45, ##ctx) \
|
|
FN(get_socket_cookie, 46, ##ctx) \
|
|
FN(get_socket_uid, 47, ##ctx) \
|
|
FN(set_hash, 48, ##ctx) \
|
|
FN(setsockopt, 49, ##ctx) \
|
|
FN(skb_adjust_room, 50, ##ctx) \
|
|
FN(redirect_map, 51, ##ctx) \
|
|
FN(sk_redirect_map, 52, ##ctx) \
|
|
FN(sock_map_update, 53, ##ctx) \
|
|
FN(xdp_adjust_meta, 54, ##ctx) \
|
|
FN(perf_event_read_value, 55, ##ctx) \
|
|
FN(perf_prog_read_value, 56, ##ctx) \
|
|
FN(getsockopt, 57, ##ctx) \
|
|
FN(override_return, 58, ##ctx) \
|
|
FN(sock_ops_cb_flags_set, 59, ##ctx) \
|
|
FN(msg_redirect_map, 60, ##ctx) \
|
|
FN(msg_apply_bytes, 61, ##ctx) \
|
|
FN(msg_cork_bytes, 62, ##ctx) \
|
|
FN(msg_pull_data, 63, ##ctx) \
|
|
FN(bind, 64, ##ctx) \
|
|
FN(xdp_adjust_tail, 65, ##ctx) \
|
|
FN(skb_get_xfrm_state, 66, ##ctx) \
|
|
FN(get_stack, 67, ##ctx) \
|
|
FN(skb_load_bytes_relative, 68, ##ctx) \
|
|
FN(fib_lookup, 69, ##ctx) \
|
|
FN(sock_hash_update, 70, ##ctx) \
|
|
FN(msg_redirect_hash, 71, ##ctx) \
|
|
FN(sk_redirect_hash, 72, ##ctx) \
|
|
FN(lwt_push_encap, 73, ##ctx) \
|
|
FN(lwt_seg6_store_bytes, 74, ##ctx) \
|
|
FN(lwt_seg6_adjust_srh, 75, ##ctx) \
|
|
FN(lwt_seg6_action, 76, ##ctx) \
|
|
FN(rc_repeat, 77, ##ctx) \
|
|
FN(rc_keydown, 78, ##ctx) \
|
|
FN(skb_cgroup_id, 79, ##ctx) \
|
|
FN(get_current_cgroup_id, 80, ##ctx) \
|
|
FN(get_local_storage, 81, ##ctx) \
|
|
FN(sk_select_reuseport, 82, ##ctx) \
|
|
FN(skb_ancestor_cgroup_id, 83, ##ctx) \
|
|
FN(sk_lookup_tcp, 84, ##ctx) \
|
|
FN(sk_lookup_udp, 85, ##ctx) \
|
|
FN(sk_release, 86, ##ctx) \
|
|
FN(map_push_elem, 87, ##ctx) \
|
|
FN(map_pop_elem, 88, ##ctx) \
|
|
FN(map_peek_elem, 89, ##ctx) \
|
|
FN(msg_push_data, 90, ##ctx) \
|
|
FN(msg_pop_data, 91, ##ctx) \
|
|
FN(rc_pointer_rel, 92, ##ctx) \
|
|
FN(spin_lock, 93, ##ctx) \
|
|
FN(spin_unlock, 94, ##ctx) \
|
|
FN(sk_fullsock, 95, ##ctx) \
|
|
FN(tcp_sock, 96, ##ctx) \
|
|
FN(skb_ecn_set_ce, 97, ##ctx) \
|
|
FN(get_listener_sock, 98, ##ctx) \
|
|
FN(skc_lookup_tcp, 99, ##ctx) \
|
|
FN(tcp_check_syncookie, 100, ##ctx) \
|
|
FN(sysctl_get_name, 101, ##ctx) \
|
|
FN(sysctl_get_current_value, 102, ##ctx) \
|
|
FN(sysctl_get_new_value, 103, ##ctx) \
|
|
FN(sysctl_set_new_value, 104, ##ctx) \
|
|
FN(strtol, 105, ##ctx) \
|
|
FN(strtoul, 106, ##ctx) \
|
|
FN(sk_storage_get, 107, ##ctx) \
|
|
FN(sk_storage_delete, 108, ##ctx) \
|
|
FN(send_signal, 109, ##ctx) \
|
|
FN(tcp_gen_syncookie, 110, ##ctx) \
|
|
FN(skb_output, 111, ##ctx) \
|
|
FN(probe_read_user, 112, ##ctx) \
|
|
FN(probe_read_kernel, 113, ##ctx) \
|
|
FN(probe_read_user_str, 114, ##ctx) \
|
|
FN(probe_read_kernel_str, 115, ##ctx) \
|
|
FN(tcp_send_ack, 116, ##ctx) \
|
|
FN(send_signal_thread, 117, ##ctx) \
|
|
FN(jiffies64, 118, ##ctx) \
|
|
FN(read_branch_records, 119, ##ctx) \
|
|
FN(get_ns_current_pid_tgid, 120, ##ctx) \
|
|
FN(xdp_output, 121, ##ctx) \
|
|
FN(get_netns_cookie, 122, ##ctx) \
|
|
FN(get_current_ancestor_cgroup_id, 123, ##ctx) \
|
|
FN(sk_assign, 124, ##ctx) \
|
|
FN(ktime_get_boot_ns, 125, ##ctx) \
|
|
FN(seq_printf, 126, ##ctx) \
|
|
FN(seq_write, 127, ##ctx) \
|
|
FN(sk_cgroup_id, 128, ##ctx) \
|
|
FN(sk_ancestor_cgroup_id, 129, ##ctx) \
|
|
FN(ringbuf_output, 130, ##ctx) \
|
|
FN(ringbuf_reserve, 131, ##ctx) \
|
|
FN(ringbuf_submit, 132, ##ctx) \
|
|
FN(ringbuf_discard, 133, ##ctx) \
|
|
FN(ringbuf_query, 134, ##ctx) \
|
|
FN(csum_level, 135, ##ctx) \
|
|
FN(skc_to_tcp6_sock, 136, ##ctx) \
|
|
FN(skc_to_tcp_sock, 137, ##ctx) \
|
|
FN(skc_to_tcp_timewait_sock, 138, ##ctx) \
|
|
FN(skc_to_tcp_request_sock, 139, ##ctx) \
|
|
FN(skc_to_udp6_sock, 140, ##ctx) \
|
|
FN(get_task_stack, 141, ##ctx) \
|
|
FN(load_hdr_opt, 142, ##ctx) \
|
|
FN(store_hdr_opt, 143, ##ctx) \
|
|
FN(reserve_hdr_opt, 144, ##ctx) \
|
|
FN(inode_storage_get, 145, ##ctx) \
|
|
FN(inode_storage_delete, 146, ##ctx) \
|
|
FN(d_path, 147, ##ctx) \
|
|
FN(copy_from_user, 148, ##ctx) \
|
|
FN(snprintf_btf, 149, ##ctx) \
|
|
FN(seq_printf_btf, 150, ##ctx) \
|
|
FN(skb_cgroup_classid, 151, ##ctx) \
|
|
FN(redirect_neigh, 152, ##ctx) \
|
|
FN(per_cpu_ptr, 153, ##ctx) \
|
|
FN(this_cpu_ptr, 154, ##ctx) \
|
|
FN(redirect_peer, 155, ##ctx) \
|
|
FN(task_storage_get, 156, ##ctx) \
|
|
FN(task_storage_delete, 157, ##ctx) \
|
|
FN(get_current_task_btf, 158, ##ctx) \
|
|
FN(bprm_opts_set, 159, ##ctx) \
|
|
FN(ktime_get_coarse_ns, 160, ##ctx) \
|
|
FN(ima_inode_hash, 161, ##ctx) \
|
|
FN(sock_from_file, 162, ##ctx) \
|
|
FN(check_mtu, 163, ##ctx) \
|
|
FN(for_each_map_elem, 164, ##ctx) \
|
|
FN(snprintf, 165, ##ctx) \
|
|
FN(sys_bpf, 166, ##ctx) \
|
|
FN(btf_find_by_name_kind, 167, ##ctx) \
|
|
FN(sys_close, 168, ##ctx) \
|
|
FN(timer_init, 169, ##ctx) \
|
|
FN(timer_set_callback, 170, ##ctx) \
|
|
FN(timer_start, 171, ##ctx) \
|
|
FN(timer_cancel, 172, ##ctx) \
|
|
FN(get_func_ip, 173, ##ctx) \
|
|
FN(get_attach_cookie, 174, ##ctx) \
|
|
FN(task_pt_regs, 175, ##ctx) \
|
|
FN(get_branch_snapshot, 176, ##ctx) \
|
|
FN(trace_vprintk, 177, ##ctx) \
|
|
FN(skc_to_unix_sock, 178, ##ctx) \
|
|
FN(kallsyms_lookup_name, 179, ##ctx) \
|
|
FN(find_vma, 180, ##ctx) \
|
|
FN(loop, 181, ##ctx) \
|
|
FN(strncmp, 182, ##ctx) \
|
|
FN(get_func_arg, 183, ##ctx) \
|
|
FN(get_func_ret, 184, ##ctx) \
|
|
FN(get_func_arg_cnt, 185, ##ctx) \
|
|
FN(get_retval, 186, ##ctx) \
|
|
FN(set_retval, 187, ##ctx) \
|
|
FN(xdp_get_buff_len, 188, ##ctx) \
|
|
FN(xdp_load_bytes, 189, ##ctx) \
|
|
FN(xdp_store_bytes, 190, ##ctx) \
|
|
FN(copy_from_user_task, 191, ##ctx) \
|
|
FN(skb_set_tstamp, 192, ##ctx) \
|
|
FN(ima_file_hash, 193, ##ctx) \
|
|
FN(kptr_xchg, 194, ##ctx) \
|
|
FN(map_lookup_percpu_elem, 195, ##ctx) \
|
|
FN(skc_to_mptcp_sock, 196, ##ctx) \
|
|
FN(dynptr_from_mem, 197, ##ctx) \
|
|
FN(ringbuf_reserve_dynptr, 198, ##ctx) \
|
|
FN(ringbuf_submit_dynptr, 199, ##ctx) \
|
|
FN(ringbuf_discard_dynptr, 200, ##ctx) \
|
|
FN(dynptr_read, 201, ##ctx) \
|
|
FN(dynptr_write, 202, ##ctx) \
|
|
FN(dynptr_data, 203, ##ctx) \
|
|
FN(tcp_raw_gen_syncookie_ipv4, 204, ##ctx) \
|
|
FN(tcp_raw_gen_syncookie_ipv6, 205, ##ctx) \
|
|
FN(tcp_raw_check_syncookie_ipv4, 206, ##ctx) \
|
|
FN(tcp_raw_check_syncookie_ipv6, 207, ##ctx) \
|
|
FN(ktime_get_tai_ns, 208, ##ctx) \
|
|
FN(user_ringbuf_drain, 209, ##ctx) \
|
|
FN(cgrp_storage_get, 210, ##ctx) \
|
|
FN(cgrp_storage_delete, 211, ##ctx) \
|
|
/* */
|
|
|
|
/* backwards-compatibility macros for users of __BPF_FUNC_MAPPER that don't
|
|
* know or care about integer value that is now passed as second argument
|
|
*/
|
|
#define __BPF_FUNC_MAPPER_APPLY(name, value, FN) FN(name),
|
|
#define __BPF_FUNC_MAPPER(FN) ___BPF_FUNC_MAPPER(__BPF_FUNC_MAPPER_APPLY, FN)
|
|
|
|
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
|
|
* function eBPF program intends to call
|
|
*/
|
|
#define __BPF_ENUM_FN(x, y) BPF_FUNC_ ## x = y,
|
|
enum bpf_func_id {
|
|
___BPF_FUNC_MAPPER(__BPF_ENUM_FN)
|
|
__BPF_FUNC_MAX_ID,
|
|
};
|
|
#undef __BPF_ENUM_FN
|
|
|
|
/* All flags used by eBPF helper functions, placed here. */
|
|
|
|
/* BPF_FUNC_skb_store_bytes flags. */
|
|
enum {
|
|
BPF_F_RECOMPUTE_CSUM = (1ULL << 0),
|
|
BPF_F_INVALIDATE_HASH = (1ULL << 1),
|
|
};
|
|
|
|
/* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
|
|
* First 4 bits are for passing the header field size.
|
|
*/
|
|
enum {
|
|
BPF_F_HDR_FIELD_MASK = 0xfULL,
|
|
};
|
|
|
|
/* BPF_FUNC_l4_csum_replace flags. */
|
|
enum {
|
|
BPF_F_PSEUDO_HDR = (1ULL << 4),
|
|
BPF_F_MARK_MANGLED_0 = (1ULL << 5),
|
|
BPF_F_MARK_ENFORCE = (1ULL << 6),
|
|
};
|
|
|
|
/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
|
|
enum {
|
|
BPF_F_INGRESS = (1ULL << 0),
|
|
};
|
|
|
|
/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
|
|
enum {
|
|
BPF_F_TUNINFO_IPV6 = (1ULL << 0),
|
|
};
|
|
|
|
/* flags for both BPF_FUNC_get_stackid and BPF_FUNC_get_stack. */
|
|
enum {
|
|
BPF_F_SKIP_FIELD_MASK = 0xffULL,
|
|
BPF_F_USER_STACK = (1ULL << 8),
|
|
/* flags used by BPF_FUNC_get_stackid only. */
|
|
BPF_F_FAST_STACK_CMP = (1ULL << 9),
|
|
BPF_F_REUSE_STACKID = (1ULL << 10),
|
|
/* flags used by BPF_FUNC_get_stack only. */
|
|
BPF_F_USER_BUILD_ID = (1ULL << 11),
|
|
};
|
|
|
|
/* BPF_FUNC_skb_set_tunnel_key flags. */
|
|
enum {
|
|
BPF_F_ZERO_CSUM_TX = (1ULL << 1),
|
|
BPF_F_DONT_FRAGMENT = (1ULL << 2),
|
|
BPF_F_SEQ_NUMBER = (1ULL << 3),
|
|
BPF_F_NO_TUNNEL_KEY = (1ULL << 4),
|
|
};
|
|
|
|
/* BPF_FUNC_skb_get_tunnel_key flags. */
|
|
enum {
|
|
BPF_F_TUNINFO_FLAGS = (1ULL << 4),
|
|
};
|
|
|
|
/* BPF_FUNC_perf_event_output, BPF_FUNC_perf_event_read and
|
|
* BPF_FUNC_perf_event_read_value flags.
|
|
*/
|
|
enum {
|
|
BPF_F_INDEX_MASK = 0xffffffffULL,
|
|
BPF_F_CURRENT_CPU = BPF_F_INDEX_MASK,
|
|
/* BPF_FUNC_perf_event_output for sk_buff input context. */
|
|
BPF_F_CTXLEN_MASK = (0xfffffULL << 32),
|
|
};
|
|
|
|
/* Current network namespace */
|
|
enum {
|
|
BPF_F_CURRENT_NETNS = (-1L),
|
|
};
|
|
|
|
/* BPF_FUNC_csum_level level values. */
|
|
enum {
|
|
BPF_CSUM_LEVEL_QUERY,
|
|
BPF_CSUM_LEVEL_INC,
|
|
BPF_CSUM_LEVEL_DEC,
|
|
BPF_CSUM_LEVEL_RESET,
|
|
};
|
|
|
|
/* BPF_FUNC_skb_adjust_room flags. */
|
|
enum {
|
|
BPF_F_ADJ_ROOM_FIXED_GSO = (1ULL << 0),
|
|
BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 = (1ULL << 1),
|
|
BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 = (1ULL << 2),
|
|
BPF_F_ADJ_ROOM_ENCAP_L4_GRE = (1ULL << 3),
|
|
BPF_F_ADJ_ROOM_ENCAP_L4_UDP = (1ULL << 4),
|
|
BPF_F_ADJ_ROOM_NO_CSUM_RESET = (1ULL << 5),
|
|
BPF_F_ADJ_ROOM_ENCAP_L2_ETH = (1ULL << 6),
|
|
BPF_F_ADJ_ROOM_DECAP_L3_IPV4 = (1ULL << 7),
|
|
BPF_F_ADJ_ROOM_DECAP_L3_IPV6 = (1ULL << 8),
|
|
};
|
|
|
|
enum {
|
|
BPF_ADJ_ROOM_ENCAP_L2_MASK = 0xff,
|
|
BPF_ADJ_ROOM_ENCAP_L2_SHIFT = 56,
|
|
};
|
|
|
|
#define BPF_F_ADJ_ROOM_ENCAP_L2(len) (((__u64)len & \
|
|
BPF_ADJ_ROOM_ENCAP_L2_MASK) \
|
|
<< BPF_ADJ_ROOM_ENCAP_L2_SHIFT)
|
|
|
|
/* BPF_FUNC_sysctl_get_name flags. */
|
|
enum {
|
|
BPF_F_SYSCTL_BASE_NAME = (1ULL << 0),
|
|
};
|
|
|
|
/* BPF_FUNC_<kernel_obj>_storage_get flags */
|
|
enum {
|
|
BPF_LOCAL_STORAGE_GET_F_CREATE = (1ULL << 0),
|
|
/* BPF_SK_STORAGE_GET_F_CREATE is only kept for backward compatibility
|
|
* and BPF_LOCAL_STORAGE_GET_F_CREATE must be used instead.
|
|
*/
|
|
BPF_SK_STORAGE_GET_F_CREATE = BPF_LOCAL_STORAGE_GET_F_CREATE,
|
|
};
|
|
|
|
/* BPF_FUNC_read_branch_records flags. */
|
|
enum {
|
|
BPF_F_GET_BRANCH_RECORDS_SIZE = (1ULL << 0),
|
|
};
|
|
|
|
/* BPF_FUNC_bpf_ringbuf_commit, BPF_FUNC_bpf_ringbuf_discard, and
|
|
* BPF_FUNC_bpf_ringbuf_output flags.
|
|
*/
|
|
enum {
|
|
BPF_RB_NO_WAKEUP = (1ULL << 0),
|
|
BPF_RB_FORCE_WAKEUP = (1ULL << 1),
|
|
};
|
|
|
|
/* BPF_FUNC_bpf_ringbuf_query flags */
|
|
enum {
|
|
BPF_RB_AVAIL_DATA = 0,
|
|
BPF_RB_RING_SIZE = 1,
|
|
BPF_RB_CONS_POS = 2,
|
|
BPF_RB_PROD_POS = 3,
|
|
};
|
|
|
|
/* BPF ring buffer constants */
|
|
enum {
|
|
BPF_RINGBUF_BUSY_BIT = (1U << 31),
|
|
BPF_RINGBUF_DISCARD_BIT = (1U << 30),
|
|
BPF_RINGBUF_HDR_SZ = 8,
|
|
};
|
|
|
|
/* BPF_FUNC_sk_assign flags in bpf_sk_lookup context. */
|
|
enum {
|
|
BPF_SK_LOOKUP_F_REPLACE = (1ULL << 0),
|
|
BPF_SK_LOOKUP_F_NO_REUSEPORT = (1ULL << 1),
|
|
};
|
|
|
|
/* Mode for BPF_FUNC_skb_adjust_room helper. */
|
|
enum bpf_adj_room_mode {
|
|
BPF_ADJ_ROOM_NET,
|
|
BPF_ADJ_ROOM_MAC,
|
|
};
|
|
|
|
/* Mode for BPF_FUNC_skb_load_bytes_relative helper. */
|
|
enum bpf_hdr_start_off {
|
|
BPF_HDR_START_MAC,
|
|
BPF_HDR_START_NET,
|
|
};
|
|
|
|
/* Encapsulation type for BPF_FUNC_lwt_push_encap helper. */
|
|
enum bpf_lwt_encap_mode {
|
|
BPF_LWT_ENCAP_SEG6,
|
|
BPF_LWT_ENCAP_SEG6_INLINE,
|
|
BPF_LWT_ENCAP_IP,
|
|
};
|
|
|
|
/* Flags for bpf_bprm_opts_set helper */
|
|
enum {
|
|
BPF_F_BPRM_SECUREEXEC = (1ULL << 0),
|
|
};
|
|
|
|
/* Flags for bpf_redirect_map helper */
|
|
enum {
|
|
BPF_F_BROADCAST = (1ULL << 3),
|
|
BPF_F_EXCLUDE_INGRESS = (1ULL << 4),
|
|
};
|
|
|
|
#define __bpf_md_ptr(type, name) \
|
|
union { \
|
|
type name; \
|
|
__u64 :64; \
|
|
} __attribute__((aligned(8)))
|
|
|
|
enum {
|
|
BPF_SKB_TSTAMP_UNSPEC,
|
|
BPF_SKB_TSTAMP_DELIVERY_MONO, /* tstamp has mono delivery time */
|
|
/* For any BPF_SKB_TSTAMP_* that the bpf prog cannot handle,
|
|
* the bpf prog should handle it like BPF_SKB_TSTAMP_UNSPEC
|
|
* and try to deduce it by ingress, egress or skb->sk->sk_clockid.
|
|
*/
|
|
};
|
|
|
|
/* user accessible mirror of in-kernel sk_buff.
|
|
* new fields can only be added to the end of this structure
|
|
*/
|
|
struct __sk_buff {
|
|
__u32 len;
|
|
__u32 pkt_type;
|
|
__u32 mark;
|
|
__u32 queue_mapping;
|
|
__u32 protocol;
|
|
__u32 vlan_present;
|
|
__u32 vlan_tci;
|
|
__u32 vlan_proto;
|
|
__u32 priority;
|
|
__u32 ingress_ifindex;
|
|
__u32 ifindex;
|
|
__u32 tc_index;
|
|
__u32 cb[5];
|
|
__u32 hash;
|
|
__u32 tc_classid;
|
|
__u32 data;
|
|
__u32 data_end;
|
|
__u32 napi_id;
|
|
|
|
/* Accessed by BPF_PROG_TYPE_sk_skb types from here to ... */
|
|
__u32 family;
|
|
__u32 remote_ip4; /* Stored in network byte order */
|
|
__u32 local_ip4; /* Stored in network byte order */
|
|
__u32 remote_ip6[4]; /* Stored in network byte order */
|
|
__u32 local_ip6[4]; /* Stored in network byte order */
|
|
__u32 remote_port; /* Stored in network byte order */
|
|
__u32 local_port; /* stored in host byte order */
|
|
/* ... here. */
|
|
|
|
__u32 data_meta;
|
|
__bpf_md_ptr(struct bpf_flow_keys *, flow_keys);
|
|
__u64 tstamp;
|
|
__u32 wire_len;
|
|
__u32 gso_segs;
|
|
__bpf_md_ptr(struct bpf_sock *, sk);
|
|
__u32 gso_size;
|
|
__u8 tstamp_type;
|
|
__u32 :24; /* Padding, future use. */
|
|
__u64 hwtstamp;
|
|
};
|
|
|
|
struct bpf_tunnel_key {
|
|
__u32 tunnel_id;
|
|
union {
|
|
__u32 remote_ipv4;
|
|
__u32 remote_ipv6[4];
|
|
};
|
|
__u8 tunnel_tos;
|
|
__u8 tunnel_ttl;
|
|
union {
|
|
__u16 tunnel_ext; /* compat */
|
|
__be16 tunnel_flags;
|
|
};
|
|
__u32 tunnel_label;
|
|
union {
|
|
__u32 local_ipv4;
|
|
__u32 local_ipv6[4];
|
|
};
|
|
};
|
|
|
|
/* user accessible mirror of in-kernel xfrm_state.
|
|
* new fields can only be added to the end of this structure
|
|
*/
|
|
struct bpf_xfrm_state {
|
|
__u32 reqid;
|
|
__u32 spi; /* Stored in network byte order */
|
|
__u16 family;
|
|
__u16 ext; /* Padding, future use. */
|
|
union {
|
|
__u32 remote_ipv4; /* Stored in network byte order */
|
|
__u32 remote_ipv6[4]; /* Stored in network byte order */
|
|
};
|
|
};
|
|
|
|
/* Generic BPF return codes which all BPF program types may support.
|
|
* The values are binary compatible with their TC_ACT_* counter-part to
|
|
* provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
|
|
* programs.
|
|
*
|
|
* XDP is handled seprately, see XDP_*.
|
|
*/
|
|
enum bpf_ret_code {
|
|
BPF_OK = 0,
|
|
/* 1 reserved */
|
|
BPF_DROP = 2,
|
|
/* 3-6 reserved */
|
|
BPF_REDIRECT = 7,
|
|
/* >127 are reserved for prog type specific return codes.
|
|
*
|
|
* BPF_LWT_REROUTE: used by BPF_PROG_TYPE_LWT_IN and
|
|
* BPF_PROG_TYPE_LWT_XMIT to indicate that skb had been
|
|
* changed and should be routed based on its new L3 header.
|
|
* (This is an L3 redirect, as opposed to L2 redirect
|
|
* represented by BPF_REDIRECT above).
|
|
*/
|
|
BPF_LWT_REROUTE = 128,
|
|
/* BPF_FLOW_DISSECTOR_CONTINUE: used by BPF_PROG_TYPE_FLOW_DISSECTOR
|
|
* to indicate that no custom dissection was performed, and
|
|
* fallback to standard dissector is requested.
|
|
*/
|
|
BPF_FLOW_DISSECTOR_CONTINUE = 129,
|
|
};
|
|
|
|
struct bpf_sock {
|
|
__u32 bound_dev_if;
|
|
__u32 family;
|
|
__u32 type;
|
|
__u32 protocol;
|
|
__u32 mark;
|
|
__u32 priority;
|
|
/* IP address also allows 1 and 2 bytes access */
|
|
__u32 src_ip4;
|
|
__u32 src_ip6[4];
|
|
__u32 src_port; /* host byte order */
|
|
__be16 dst_port; /* network byte order */
|
|
__u16 :16; /* zero padding */
|
|
__u32 dst_ip4;
|
|
__u32 dst_ip6[4];
|
|
__u32 state;
|
|
__s32 rx_queue_mapping;
|
|
};
|
|
|
|
struct bpf_tcp_sock {
|
|
__u32 snd_cwnd; /* Sending congestion window */
|
|
__u32 srtt_us; /* smoothed round trip time << 3 in usecs */
|
|
__u32 rtt_min;
|
|
__u32 snd_ssthresh; /* Slow start size threshold */
|
|
__u32 rcv_nxt; /* What we want to receive next */
|
|
__u32 snd_nxt; /* Next sequence we send */
|
|
__u32 snd_una; /* First byte we want an ack for */
|
|
__u32 mss_cache; /* Cached effective mss, not including SACKS */
|
|
__u32 ecn_flags; /* ECN status bits. */
|
|
__u32 rate_delivered; /* saved rate sample: packets delivered */
|
|
__u32 rate_interval_us; /* saved rate sample: time elapsed */
|
|
__u32 packets_out; /* Packets which are "in flight" */
|
|
__u32 retrans_out; /* Retransmitted packets out */
|
|
__u32 total_retrans; /* Total retransmits for entire connection */
|
|
__u32 segs_in; /* RFC4898 tcpEStatsPerfSegsIn
|
|
* total number of segments in.
|
|
*/
|
|
__u32 data_segs_in; /* RFC4898 tcpEStatsPerfDataSegsIn
|
|
* total number of data segments in.
|
|
*/
|
|
__u32 segs_out; /* RFC4898 tcpEStatsPerfSegsOut
|
|
* The total number of segments sent.
|
|
*/
|
|
__u32 data_segs_out; /* RFC4898 tcpEStatsPerfDataSegsOut
|
|
* total number of data segments sent.
|
|
*/
|
|
__u32 lost_out; /* Lost packets */
|
|
__u32 sacked_out; /* SACK'd packets */
|
|
__u64 bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived
|
|
* sum(delta(rcv_nxt)), or how many bytes
|
|
* were acked.
|
|
*/
|
|
__u64 bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked
|
|
* sum(delta(snd_una)), or how many bytes
|
|
* were acked.
|
|
*/
|
|
__u32 dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups
|
|
* total number of DSACK blocks received
|
|
*/
|
|
__u32 delivered; /* Total data packets delivered incl. rexmits */
|
|
__u32 delivered_ce; /* Like the above but only ECE marked packets */
|
|
__u32 icsk_retransmits; /* Number of unrecovered [RTO] timeouts */
|
|
};
|
|
|
|
struct bpf_sock_tuple {
|
|
union {
|
|
struct {
|
|
__be32 saddr;
|
|
__be32 daddr;
|
|
__be16 sport;
|
|
__be16 dport;
|
|
} ipv4;
|
|
struct {
|
|
__be32 saddr[4];
|
|
__be32 daddr[4];
|
|
__be16 sport;
|
|
__be16 dport;
|
|
} ipv6;
|
|
};
|
|
};
|
|
|
|
struct bpf_xdp_sock {
|
|
__u32 queue_id;
|
|
};
|
|
|
|
#define XDP_PACKET_HEADROOM 256
|
|
|
|
/* User return codes for XDP prog type.
|
|
* A valid XDP program must return one of these defined values. All other
|
|
* return codes are reserved for future use. Unknown return codes will
|
|
* result in packet drops and a warning via bpf_warn_invalid_xdp_action().
|
|
*/
|
|
enum xdp_action {
|
|
XDP_ABORTED = 0,
|
|
XDP_DROP,
|
|
XDP_PASS,
|
|
XDP_TX,
|
|
XDP_REDIRECT,
|
|
};
|
|
|
|
/* user accessible metadata for XDP packet hook
|
|
* new fields must be added to the end of this structure
|
|
*/
|
|
struct xdp_md {
|
|
__u32 data;
|
|
__u32 data_end;
|
|
__u32 data_meta;
|
|
/* Below access go through struct xdp_rxq_info */
|
|
__u32 ingress_ifindex; /* rxq->dev->ifindex */
|
|
__u32 rx_queue_index; /* rxq->queue_index */
|
|
|
|
__u32 egress_ifindex; /* txq->dev->ifindex */
|
|
};
|
|
|
|
/* DEVMAP map-value layout
|
|
*
|
|
* The struct data-layout of map-value is a configuration interface.
|
|
* New members can only be added to the end of this structure.
|
|
*/
|
|
struct bpf_devmap_val {
|
|
__u32 ifindex; /* device index */
|
|
union {
|
|
int fd; /* prog fd on map write */
|
|
__u32 id; /* prog id on map read */
|
|
} bpf_prog;
|
|
};
|
|
|
|
/* CPUMAP map-value layout
|
|
*
|
|
* The struct data-layout of map-value is a configuration interface.
|
|
* New members can only be added to the end of this structure.
|
|
*/
|
|
struct bpf_cpumap_val {
|
|
__u32 qsize; /* queue size to remote target CPU */
|
|
union {
|
|
int fd; /* prog fd on map write */
|
|
__u32 id; /* prog id on map read */
|
|
} bpf_prog;
|
|
};
|
|
|
|
enum sk_action {
|
|
SK_DROP = 0,
|
|
SK_PASS,
|
|
};
|
|
|
|
/* user accessible metadata for SK_MSG packet hook, new fields must
|
|
* be added to the end of this structure
|
|
*/
|
|
struct sk_msg_md {
|
|
__bpf_md_ptr(void *, data);
|
|
__bpf_md_ptr(void *, data_end);
|
|
|
|
__u32 family;
|
|
__u32 remote_ip4; /* Stored in network byte order */
|
|
__u32 local_ip4; /* Stored in network byte order */
|
|
__u32 remote_ip6[4]; /* Stored in network byte order */
|
|
__u32 local_ip6[4]; /* Stored in network byte order */
|
|
__u32 remote_port; /* Stored in network byte order */
|
|
__u32 local_port; /* stored in host byte order */
|
|
__u32 size; /* Total size of sk_msg */
|
|
|
|
__bpf_md_ptr(struct bpf_sock *, sk); /* current socket */
|
|
};
|
|
|
|
struct sk_reuseport_md {
|
|
/*
|
|
* Start of directly accessible data. It begins from
|
|
* the tcp/udp header.
|
|
*/
|
|
__bpf_md_ptr(void *, data);
|
|
/* End of directly accessible data */
|
|
__bpf_md_ptr(void *, data_end);
|
|
/*
|
|
* Total length of packet (starting from the tcp/udp header).
|
|
* Note that the directly accessible bytes (data_end - data)
|
|
* could be less than this "len". Those bytes could be
|
|
* indirectly read by a helper "bpf_skb_load_bytes()".
|
|
*/
|
|
__u32 len;
|
|
/*
|
|
* Eth protocol in the mac header (network byte order). e.g.
|
|
* ETH_P_IP(0x0800) and ETH_P_IPV6(0x86DD)
|
|
*/
|
|
__u32 eth_protocol;
|
|
__u32 ip_protocol; /* IP protocol. e.g. IPPROTO_TCP, IPPROTO_UDP */
|
|
__u32 bind_inany; /* Is sock bound to an INANY address? */
|
|
__u32 hash; /* A hash of the packet 4 tuples */
|
|
/* When reuse->migrating_sk is NULL, it is selecting a sk for the
|
|
* new incoming connection request (e.g. selecting a listen sk for
|
|
* the received SYN in the TCP case). reuse->sk is one of the sk
|
|
* in the reuseport group. The bpf prog can use reuse->sk to learn
|
|
* the local listening ip/port without looking into the skb.
|
|
*
|
|
* When reuse->migrating_sk is not NULL, reuse->sk is closed and
|
|
* reuse->migrating_sk is the socket that needs to be migrated
|
|
* to another listening socket. migrating_sk could be a fullsock
|
|
* sk that is fully established or a reqsk that is in-the-middle
|
|
* of 3-way handshake.
|
|
*/
|
|
__bpf_md_ptr(struct bpf_sock *, sk);
|
|
__bpf_md_ptr(struct bpf_sock *, migrating_sk);
|
|
};
|
|
|
|
#define BPF_TAG_SIZE 8
|
|
|
|
struct bpf_prog_info {
|
|
__u32 type;
|
|
__u32 id;
|
|
__u8 tag[BPF_TAG_SIZE];
|
|
__u32 jited_prog_len;
|
|
__u32 xlated_prog_len;
|
|
__aligned_u64 jited_prog_insns;
|
|
__aligned_u64 xlated_prog_insns;
|
|
__u64 load_time; /* ns since boottime */
|
|
__u32 created_by_uid;
|
|
__u32 nr_map_ids;
|
|
__aligned_u64 map_ids;
|
|
char name[BPF_OBJ_NAME_LEN];
|
|
__u32 ifindex;
|
|
__u32 gpl_compatible:1;
|
|
__u32 :31; /* alignment pad */
|
|
__u64 netns_dev;
|
|
__u64 netns_ino;
|
|
__u32 nr_jited_ksyms;
|
|
__u32 nr_jited_func_lens;
|
|
__aligned_u64 jited_ksyms;
|
|
__aligned_u64 jited_func_lens;
|
|
__u32 btf_id;
|
|
__u32 func_info_rec_size;
|
|
__aligned_u64 func_info;
|
|
__u32 nr_func_info;
|
|
__u32 nr_line_info;
|
|
__aligned_u64 line_info;
|
|
__aligned_u64 jited_line_info;
|
|
__u32 nr_jited_line_info;
|
|
__u32 line_info_rec_size;
|
|
__u32 jited_line_info_rec_size;
|
|
__u32 nr_prog_tags;
|
|
__aligned_u64 prog_tags;
|
|
__u64 run_time_ns;
|
|
__u64 run_cnt;
|
|
__u64 recursion_misses;
|
|
__u32 verified_insns;
|
|
__u32 attach_btf_obj_id;
|
|
__u32 attach_btf_id;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_map_info {
|
|
__u32 type;
|
|
__u32 id;
|
|
__u32 key_size;
|
|
__u32 value_size;
|
|
__u32 max_entries;
|
|
__u32 map_flags;
|
|
char name[BPF_OBJ_NAME_LEN];
|
|
__u32 ifindex;
|
|
__u32 btf_vmlinux_value_type_id;
|
|
__u64 netns_dev;
|
|
__u64 netns_ino;
|
|
__u32 btf_id;
|
|
__u32 btf_key_type_id;
|
|
__u32 btf_value_type_id;
|
|
__u32 :32; /* alignment pad */
|
|
__u64 map_extra;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_btf_info {
|
|
__aligned_u64 btf;
|
|
__u32 btf_size;
|
|
__u32 id;
|
|
__aligned_u64 name;
|
|
__u32 name_len;
|
|
__u32 kernel_btf;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_link_info {
|
|
__u32 type;
|
|
__u32 id;
|
|
__u32 prog_id;
|
|
union {
|
|
struct {
|
|
__aligned_u64 tp_name; /* in/out: tp_name buffer ptr */
|
|
__u32 tp_name_len; /* in/out: tp_name buffer len */
|
|
} raw_tracepoint;
|
|
struct {
|
|
__u32 attach_type;
|
|
__u32 target_obj_id; /* prog_id for PROG_EXT, otherwise btf object id */
|
|
__u32 target_btf_id; /* BTF type id inside the object */
|
|
} tracing;
|
|
struct {
|
|
__u64 cgroup_id;
|
|
__u32 attach_type;
|
|
} cgroup;
|
|
struct {
|
|
__aligned_u64 target_name; /* in/out: target_name buffer ptr */
|
|
__u32 target_name_len; /* in/out: target_name buffer len */
|
|
|
|
/* If the iter specific field is 32 bits, it can be put
|
|
* in the first or second union. Otherwise it should be
|
|
* put in the second union.
|
|
*/
|
|
union {
|
|
struct {
|
|
__u32 map_id;
|
|
} map;
|
|
};
|
|
union {
|
|
struct {
|
|
__u64 cgroup_id;
|
|
__u32 order;
|
|
} cgroup;
|
|
struct {
|
|
__u32 tid;
|
|
__u32 pid;
|
|
} task;
|
|
};
|
|
} iter;
|
|
struct {
|
|
__u32 netns_ino;
|
|
__u32 attach_type;
|
|
} netns;
|
|
struct {
|
|
__u32 ifindex;
|
|
} xdp;
|
|
struct {
|
|
__u32 map_id;
|
|
} struct_ops;
|
|
struct {
|
|
__u32 pf;
|
|
__u32 hooknum;
|
|
__s32 priority;
|
|
__u32 flags;
|
|
} netfilter;
|
|
};
|
|
} __attribute__((aligned(8)));
|
|
|
|
/* User bpf_sock_addr struct to access socket fields and sockaddr struct passed
|
|
* by user and intended to be used by socket (e.g. to bind to, depends on
|
|
* attach type).
|
|
*/
|
|
struct bpf_sock_addr {
|
|
__u32 user_family; /* Allows 4-byte read, but no write. */
|
|
__u32 user_ip4; /* Allows 1,2,4-byte read and 4-byte write.
|
|
* Stored in network byte order.
|
|
*/
|
|
__u32 user_ip6[4]; /* Allows 1,2,4,8-byte read and 4,8-byte write.
|
|
* Stored in network byte order.
|
|
*/
|
|
__u32 user_port; /* Allows 1,2,4-byte read and 4-byte write.
|
|
* Stored in network byte order
|
|
*/
|
|
__u32 family; /* Allows 4-byte read, but no write */
|
|
__u32 type; /* Allows 4-byte read, but no write */
|
|
__u32 protocol; /* Allows 4-byte read, but no write */
|
|
__u32 msg_src_ip4; /* Allows 1,2,4-byte read and 4-byte write.
|
|
* Stored in network byte order.
|
|
*/
|
|
__u32 msg_src_ip6[4]; /* Allows 1,2,4,8-byte read and 4,8-byte write.
|
|
* Stored in network byte order.
|
|
*/
|
|
__bpf_md_ptr(struct bpf_sock *, sk);
|
|
};
|
|
|
|
/* User bpf_sock_ops struct to access socket values and specify request ops
|
|
* and their replies.
|
|
* Some of this fields are in network (bigendian) byte order and may need
|
|
* to be converted before use (bpf_ntohl() defined in samples/bpf/bpf_endian.h).
|
|
* New fields can only be added at the end of this structure
|
|
*/
|
|
struct bpf_sock_ops {
|
|
__u32 op;
|
|
union {
|
|
__u32 args[4]; /* Optionally passed to bpf program */
|
|
__u32 reply; /* Returned by bpf program */
|
|
__u32 replylong[4]; /* Optionally returned by bpf prog */
|
|
};
|
|
__u32 family;
|
|
__u32 remote_ip4; /* Stored in network byte order */
|
|
__u32 local_ip4; /* Stored in network byte order */
|
|
__u32 remote_ip6[4]; /* Stored in network byte order */
|
|
__u32 local_ip6[4]; /* Stored in network byte order */
|
|
__u32 remote_port; /* Stored in network byte order */
|
|
__u32 local_port; /* stored in host byte order */
|
|
__u32 is_fullsock; /* Some TCP fields are only valid if
|
|
* there is a full socket. If not, the
|
|
* fields read as zero.
|
|
*/
|
|
__u32 snd_cwnd;
|
|
__u32 srtt_us; /* Averaged RTT << 3 in usecs */
|
|
__u32 bpf_sock_ops_cb_flags; /* flags defined in uapi/linux/tcp.h */
|
|
__u32 state;
|
|
__u32 rtt_min;
|
|
__u32 snd_ssthresh;
|
|
__u32 rcv_nxt;
|
|
__u32 snd_nxt;
|
|
__u32 snd_una;
|
|
__u32 mss_cache;
|
|
__u32 ecn_flags;
|
|
__u32 rate_delivered;
|
|
__u32 rate_interval_us;
|
|
__u32 packets_out;
|
|
__u32 retrans_out;
|
|
__u32 total_retrans;
|
|
__u32 segs_in;
|
|
__u32 data_segs_in;
|
|
__u32 segs_out;
|
|
__u32 data_segs_out;
|
|
__u32 lost_out;
|
|
__u32 sacked_out;
|
|
__u32 sk_txhash;
|
|
__u64 bytes_received;
|
|
__u64 bytes_acked;
|
|
__bpf_md_ptr(struct bpf_sock *, sk);
|
|
/* [skb_data, skb_data_end) covers the whole TCP header.
|
|
*
|
|
* BPF_SOCK_OPS_PARSE_HDR_OPT_CB: The packet received
|
|
* BPF_SOCK_OPS_HDR_OPT_LEN_CB: Not useful because the
|
|
* header has not been written.
|
|
* BPF_SOCK_OPS_WRITE_HDR_OPT_CB: The header and options have
|
|
* been written so far.
|
|
* BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: The SYNACK that concludes
|
|
* the 3WHS.
|
|
* BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB: The ACK that concludes
|
|
* the 3WHS.
|
|
*
|
|
* bpf_load_hdr_opt() can also be used to read a particular option.
|
|
*/
|
|
__bpf_md_ptr(void *, skb_data);
|
|
__bpf_md_ptr(void *, skb_data_end);
|
|
__u32 skb_len; /* The total length of a packet.
|
|
* It includes the header, options,
|
|
* and payload.
|
|
*/
|
|
__u32 skb_tcp_flags; /* tcp_flags of the header. It provides
|
|
* an easy way to check for tcp_flags
|
|
* without parsing skb_data.
|
|
*
|
|
* In particular, the skb_tcp_flags
|
|
* will still be available in
|
|
* BPF_SOCK_OPS_HDR_OPT_LEN even though
|
|
* the outgoing header has not
|
|
* been written yet.
|
|
*/
|
|
__u64 skb_hwtstamp;
|
|
};
|
|
|
|
/* Definitions for bpf_sock_ops_cb_flags */
|
|
enum {
|
|
BPF_SOCK_OPS_RTO_CB_FLAG = (1<<0),
|
|
BPF_SOCK_OPS_RETRANS_CB_FLAG = (1<<1),
|
|
BPF_SOCK_OPS_STATE_CB_FLAG = (1<<2),
|
|
BPF_SOCK_OPS_RTT_CB_FLAG = (1<<3),
|
|
/* Call bpf for all received TCP headers. The bpf prog will be
|
|
* called under sock_ops->op == BPF_SOCK_OPS_PARSE_HDR_OPT_CB
|
|
*
|
|
* Please refer to the comment in BPF_SOCK_OPS_PARSE_HDR_OPT_CB
|
|
* for the header option related helpers that will be useful
|
|
* to the bpf programs.
|
|
*
|
|
* It could be used at the client/active side (i.e. connect() side)
|
|
* when the server told it that the server was in syncookie
|
|
* mode and required the active side to resend the bpf-written
|
|
* options. The active side can keep writing the bpf-options until
|
|
* it received a valid packet from the server side to confirm
|
|
* the earlier packet (and options) has been received. The later
|
|
* example patch is using it like this at the active side when the
|
|
* server is in syncookie mode.
|
|
*
|
|
* The bpf prog will usually turn this off in the common cases.
|
|
*/
|
|
BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG = (1<<4),
|
|
/* Call bpf when kernel has received a header option that
|
|
* the kernel cannot handle. The bpf prog will be called under
|
|
* sock_ops->op == BPF_SOCK_OPS_PARSE_HDR_OPT_CB.
|
|
*
|
|
* Please refer to the comment in BPF_SOCK_OPS_PARSE_HDR_OPT_CB
|
|
* for the header option related helpers that will be useful
|
|
* to the bpf programs.
|
|
*/
|
|
BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG = (1<<5),
|
|
/* Call bpf when the kernel is writing header options for the
|
|
* outgoing packet. The bpf prog will first be called
|
|
* to reserve space in a skb under
|
|
* sock_ops->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB. Then
|
|
* the bpf prog will be called to write the header option(s)
|
|
* under sock_ops->op == BPF_SOCK_OPS_WRITE_HDR_OPT_CB.
|
|
*
|
|
* Please refer to the comment in BPF_SOCK_OPS_HDR_OPT_LEN_CB
|
|
* and BPF_SOCK_OPS_WRITE_HDR_OPT_CB for the header option
|
|
* related helpers that will be useful to the bpf programs.
|
|
*
|
|
* The kernel gets its chance to reserve space and write
|
|
* options first before the BPF program does.
|
|
*/
|
|
BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG = (1<<6),
|
|
/* Mask of all currently supported cb flags */
|
|
BPF_SOCK_OPS_ALL_CB_FLAGS = 0x7F,
|
|
};
|
|
|
|
/* List of known BPF sock_ops operators.
|
|
* New entries can only be added at the end
|
|
*/
|
|
enum {
|
|
BPF_SOCK_OPS_VOID,
|
|
BPF_SOCK_OPS_TIMEOUT_INIT, /* Should return SYN-RTO value to use or
|
|
* -1 if default value should be used
|
|
*/
|
|
BPF_SOCK_OPS_RWND_INIT, /* Should return initial advertized
|
|
* window (in packets) or -1 if default
|
|
* value should be used
|
|
*/
|
|
BPF_SOCK_OPS_TCP_CONNECT_CB, /* Calls BPF program right before an
|
|
* active connection is initialized
|
|
*/
|
|
BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB, /* Calls BPF program when an
|
|
* active connection is
|
|
* established
|
|
*/
|
|
BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB, /* Calls BPF program when a
|
|
* passive connection is
|
|
* established
|
|
*/
|
|
BPF_SOCK_OPS_NEEDS_ECN, /* If connection's congestion control
|
|
* needs ECN
|
|
*/
|
|
BPF_SOCK_OPS_BASE_RTT, /* Get base RTT. The correct value is
|
|
* based on the path and may be
|
|
* dependent on the congestion control
|
|
* algorithm. In general it indicates
|
|
* a congestion threshold. RTTs above
|
|
* this indicate congestion
|
|
*/
|
|
BPF_SOCK_OPS_RTO_CB, /* Called when an RTO has triggered.
|
|
* Arg1: value of icsk_retransmits
|
|
* Arg2: value of icsk_rto
|
|
* Arg3: whether RTO has expired
|
|
*/
|
|
BPF_SOCK_OPS_RETRANS_CB, /* Called when skb is retransmitted.
|
|
* Arg1: sequence number of 1st byte
|
|
* Arg2: # segments
|
|
* Arg3: return value of
|
|
* tcp_transmit_skb (0 => success)
|
|
*/
|
|
BPF_SOCK_OPS_STATE_CB, /* Called when TCP changes state.
|
|
* Arg1: old_state
|
|
* Arg2: new_state
|
|
*/
|
|
BPF_SOCK_OPS_TCP_LISTEN_CB, /* Called on listen(2), right after
|
|
* socket transition to LISTEN state.
|
|
*/
|
|
BPF_SOCK_OPS_RTT_CB, /* Called on every RTT.
|
|
*/
|
|
BPF_SOCK_OPS_PARSE_HDR_OPT_CB, /* Parse the header option.
|
|
* It will be called to handle
|
|
* the packets received at
|
|
* an already established
|
|
* connection.
|
|
*
|
|
* sock_ops->skb_data:
|
|
* Referring to the received skb.
|
|
* It covers the TCP header only.
|
|
*
|
|
* bpf_load_hdr_opt() can also
|
|
* be used to search for a
|
|
* particular option.
|
|
*/
|
|
BPF_SOCK_OPS_HDR_OPT_LEN_CB, /* Reserve space for writing the
|
|
* header option later in
|
|
* BPF_SOCK_OPS_WRITE_HDR_OPT_CB.
|
|
* Arg1: bool want_cookie. (in
|
|
* writing SYNACK only)
|
|
*
|
|
* sock_ops->skb_data:
|
|
* Not available because no header has
|
|
* been written yet.
|
|
*
|
|
* sock_ops->skb_tcp_flags:
|
|
* The tcp_flags of the
|
|
* outgoing skb. (e.g. SYN, ACK, FIN).
|
|
*
|
|
* bpf_reserve_hdr_opt() should
|
|
* be used to reserve space.
|
|
*/
|
|
BPF_SOCK_OPS_WRITE_HDR_OPT_CB, /* Write the header options
|
|
* Arg1: bool want_cookie. (in
|
|
* writing SYNACK only)
|
|
*
|
|
* sock_ops->skb_data:
|
|
* Referring to the outgoing skb.
|
|
* It covers the TCP header
|
|
* that has already been written
|
|
* by the kernel and the
|
|
* earlier bpf-progs.
|
|
*
|
|
* sock_ops->skb_tcp_flags:
|
|
* The tcp_flags of the outgoing
|
|
* skb. (e.g. SYN, ACK, FIN).
|
|
*
|
|
* bpf_store_hdr_opt() should
|
|
* be used to write the
|
|
* option.
|
|
*
|
|
* bpf_load_hdr_opt() can also
|
|
* be used to search for a
|
|
* particular option that
|
|
* has already been written
|
|
* by the kernel or the
|
|
* earlier bpf-progs.
|
|
*/
|
|
};
|
|
|
|
/* List of TCP states. There is a build check in net/ipv4/tcp.c to detect
|
|
* changes between the TCP and BPF versions. Ideally this should never happen.
|
|
* If it does, we need to add code to convert them before calling
|
|
* the BPF sock_ops function.
|
|
*/
|
|
enum {
|
|
BPF_TCP_ESTABLISHED = 1,
|
|
BPF_TCP_SYN_SENT,
|
|
BPF_TCP_SYN_RECV,
|
|
BPF_TCP_FIN_WAIT1,
|
|
BPF_TCP_FIN_WAIT2,
|
|
BPF_TCP_TIME_WAIT,
|
|
BPF_TCP_CLOSE,
|
|
BPF_TCP_CLOSE_WAIT,
|
|
BPF_TCP_LAST_ACK,
|
|
BPF_TCP_LISTEN,
|
|
BPF_TCP_CLOSING, /* Now a valid state */
|
|
BPF_TCP_NEW_SYN_RECV,
|
|
|
|
BPF_TCP_MAX_STATES /* Leave at the end! */
|
|
};
|
|
|
|
enum {
|
|
TCP_BPF_IW = 1001, /* Set TCP initial congestion window */
|
|
TCP_BPF_SNDCWND_CLAMP = 1002, /* Set sndcwnd_clamp */
|
|
TCP_BPF_DELACK_MAX = 1003, /* Max delay ack in usecs */
|
|
TCP_BPF_RTO_MIN = 1004, /* Min delay ack in usecs */
|
|
/* Copy the SYN pkt to optval
|
|
*
|
|
* BPF_PROG_TYPE_SOCK_OPS only. It is similar to the
|
|
* bpf_getsockopt(TCP_SAVED_SYN) but it does not limit
|
|
* to only getting from the saved_syn. It can either get the
|
|
* syn packet from:
|
|
*
|
|
* 1. the just-received SYN packet (only available when writing the
|
|
* SYNACK). It will be useful when it is not necessary to
|
|
* save the SYN packet for latter use. It is also the only way
|
|
* to get the SYN during syncookie mode because the syn
|
|
* packet cannot be saved during syncookie.
|
|
*
|
|
* OR
|
|
*
|
|
* 2. the earlier saved syn which was done by
|
|
* bpf_setsockopt(TCP_SAVE_SYN).
|
|
*
|
|
* The bpf_getsockopt(TCP_BPF_SYN*) option will hide where the
|
|
* SYN packet is obtained.
|
|
*
|
|
* If the bpf-prog does not need the IP[46] header, the
|
|
* bpf-prog can avoid parsing the IP header by using
|
|
* TCP_BPF_SYN. Otherwise, the bpf-prog can get both
|
|
* IP[46] and TCP header by using TCP_BPF_SYN_IP.
|
|
*
|
|
* >0: Total number of bytes copied
|
|
* -ENOSPC: Not enough space in optval. Only optlen number of
|
|
* bytes is copied.
|
|
* -ENOENT: The SYN skb is not available now and the earlier SYN pkt
|
|
* is not saved by setsockopt(TCP_SAVE_SYN).
|
|
*/
|
|
TCP_BPF_SYN = 1005, /* Copy the TCP header */
|
|
TCP_BPF_SYN_IP = 1006, /* Copy the IP[46] and TCP header */
|
|
TCP_BPF_SYN_MAC = 1007, /* Copy the MAC, IP[46], and TCP header */
|
|
};
|
|
|
|
enum {
|
|
BPF_LOAD_HDR_OPT_TCP_SYN = (1ULL << 0),
|
|
};
|
|
|
|
/* args[0] value during BPF_SOCK_OPS_HDR_OPT_LEN_CB and
|
|
* BPF_SOCK_OPS_WRITE_HDR_OPT_CB.
|
|
*/
|
|
enum {
|
|
BPF_WRITE_HDR_TCP_CURRENT_MSS = 1, /* Kernel is finding the
|
|
* total option spaces
|
|
* required for an established
|
|
* sk in order to calculate the
|
|
* MSS. No skb is actually
|
|
* sent.
|
|
*/
|
|
BPF_WRITE_HDR_TCP_SYNACK_COOKIE = 2, /* Kernel is in syncookie mode
|
|
* when sending a SYN.
|
|
*/
|
|
};
|
|
|
|
struct bpf_perf_event_value {
|
|
__u64 counter;
|
|
__u64 enabled;
|
|
__u64 running;
|
|
};
|
|
|
|
enum {
|
|
BPF_DEVCG_ACC_MKNOD = (1ULL << 0),
|
|
BPF_DEVCG_ACC_READ = (1ULL << 1),
|
|
BPF_DEVCG_ACC_WRITE = (1ULL << 2),
|
|
};
|
|
|
|
enum {
|
|
BPF_DEVCG_DEV_BLOCK = (1ULL << 0),
|
|
BPF_DEVCG_DEV_CHAR = (1ULL << 1),
|
|
};
|
|
|
|
struct bpf_cgroup_dev_ctx {
|
|
/* access_type encoded as (BPF_DEVCG_ACC_* << 16) | BPF_DEVCG_DEV_* */
|
|
__u32 access_type;
|
|
__u32 major;
|
|
__u32 minor;
|
|
};
|
|
|
|
struct bpf_raw_tracepoint_args {
|
|
__u64 args[0];
|
|
};
|
|
|
|
/* DIRECT: Skip the FIB rules and go to FIB table associated with device
|
|
* OUTPUT: Do lookup from egress perspective; default is ingress
|
|
*/
|
|
enum {
|
|
BPF_FIB_LOOKUP_DIRECT = (1U << 0),
|
|
BPF_FIB_LOOKUP_OUTPUT = (1U << 1),
|
|
BPF_FIB_LOOKUP_SKIP_NEIGH = (1U << 2),
|
|
};
|
|
|
|
enum {
|
|
BPF_FIB_LKUP_RET_SUCCESS, /* lookup successful */
|
|
BPF_FIB_LKUP_RET_BLACKHOLE, /* dest is blackholed; can be dropped */
|
|
BPF_FIB_LKUP_RET_UNREACHABLE, /* dest is unreachable; can be dropped */
|
|
BPF_FIB_LKUP_RET_PROHIBIT, /* dest not allowed; can be dropped */
|
|
BPF_FIB_LKUP_RET_NOT_FWDED, /* packet is not forwarded */
|
|
BPF_FIB_LKUP_RET_FWD_DISABLED, /* fwding is not enabled on ingress */
|
|
BPF_FIB_LKUP_RET_UNSUPP_LWT, /* fwd requires encapsulation */
|
|
BPF_FIB_LKUP_RET_NO_NEIGH, /* no neighbor entry for nh */
|
|
BPF_FIB_LKUP_RET_FRAG_NEEDED, /* fragmentation required to fwd */
|
|
};
|
|
|
|
struct bpf_fib_lookup {
|
|
/* input: network family for lookup (AF_INET, AF_INET6)
|
|
* output: network family of egress nexthop
|
|
*/
|
|
__u8 family;
|
|
|
|
/* set if lookup is to consider L4 data - e.g., FIB rules */
|
|
__u8 l4_protocol;
|
|
__be16 sport;
|
|
__be16 dport;
|
|
|
|
union { /* used for MTU check */
|
|
/* input to lookup */
|
|
__u16 tot_len; /* L3 length from network hdr (iph->tot_len) */
|
|
|
|
/* output: MTU value */
|
|
__u16 mtu_result;
|
|
};
|
|
/* input: L3 device index for lookup
|
|
* output: device index from FIB lookup
|
|
*/
|
|
__u32 ifindex;
|
|
|
|
union {
|
|
/* inputs to lookup */
|
|
__u8 tos; /* AF_INET */
|
|
__be32 flowinfo; /* AF_INET6, flow_label + priority */
|
|
|
|
/* output: metric of fib result (IPv4/IPv6 only) */
|
|
__u32 rt_metric;
|
|
};
|
|
|
|
union {
|
|
__be32 ipv4_src;
|
|
__u32 ipv6_src[4]; /* in6_addr; network order */
|
|
};
|
|
|
|
/* input to bpf_fib_lookup, ipv{4,6}_dst is destination address in
|
|
* network header. output: bpf_fib_lookup sets to gateway address
|
|
* if FIB lookup returns gateway route
|
|
*/
|
|
union {
|
|
__be32 ipv4_dst;
|
|
__u32 ipv6_dst[4]; /* in6_addr; network order */
|
|
};
|
|
|
|
/* output */
|
|
__be16 h_vlan_proto;
|
|
__be16 h_vlan_TCI;
|
|
__u8 smac[6]; /* ETH_ALEN */
|
|
__u8 dmac[6]; /* ETH_ALEN */
|
|
};
|
|
|
|
struct bpf_redir_neigh {
|
|
/* network family for lookup (AF_INET, AF_INET6) */
|
|
__u32 nh_family;
|
|
/* network address of nexthop; skips fib lookup to find gateway */
|
|
union {
|
|
__be32 ipv4_nh;
|
|
__u32 ipv6_nh[4]; /* in6_addr; network order */
|
|
};
|
|
};
|
|
|
|
/* bpf_check_mtu flags*/
|
|
enum bpf_check_mtu_flags {
|
|
BPF_MTU_CHK_SEGS = (1U << 0),
|
|
};
|
|
|
|
enum bpf_check_mtu_ret {
|
|
BPF_MTU_CHK_RET_SUCCESS, /* check and lookup successful */
|
|
BPF_MTU_CHK_RET_FRAG_NEEDED, /* fragmentation required to fwd */
|
|
BPF_MTU_CHK_RET_SEGS_TOOBIG, /* GSO re-segmentation needed to fwd */
|
|
};
|
|
|
|
enum bpf_task_fd_type {
|
|
BPF_FD_TYPE_RAW_TRACEPOINT, /* tp name */
|
|
BPF_FD_TYPE_TRACEPOINT, /* tp name */
|
|
BPF_FD_TYPE_KPROBE, /* (symbol + offset) or addr */
|
|
BPF_FD_TYPE_KRETPROBE, /* (symbol + offset) or addr */
|
|
BPF_FD_TYPE_UPROBE, /* filename + offset */
|
|
BPF_FD_TYPE_URETPROBE, /* filename + offset */
|
|
};
|
|
|
|
enum {
|
|
BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG = (1U << 0),
|
|
BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL = (1U << 1),
|
|
BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP = (1U << 2),
|
|
};
|
|
|
|
struct bpf_flow_keys {
|
|
__u16 nhoff;
|
|
__u16 thoff;
|
|
__u16 addr_proto; /* ETH_P_* of valid addrs */
|
|
__u8 is_frag;
|
|
__u8 is_first_frag;
|
|
__u8 is_encap;
|
|
__u8 ip_proto;
|
|
__be16 n_proto;
|
|
__be16 sport;
|
|
__be16 dport;
|
|
union {
|
|
struct {
|
|
__be32 ipv4_src;
|
|
__be32 ipv4_dst;
|
|
};
|
|
struct {
|
|
__u32 ipv6_src[4]; /* in6_addr; network order */
|
|
__u32 ipv6_dst[4]; /* in6_addr; network order */
|
|
};
|
|
};
|
|
__u32 flags;
|
|
__be32 flow_label;
|
|
};
|
|
|
|
struct bpf_func_info {
|
|
__u32 insn_off;
|
|
__u32 type_id;
|
|
};
|
|
|
|
#define BPF_LINE_INFO_LINE_NUM(line_col) ((line_col) >> 10)
|
|
#define BPF_LINE_INFO_LINE_COL(line_col) ((line_col) & 0x3ff)
|
|
|
|
struct bpf_line_info {
|
|
__u32 insn_off;
|
|
__u32 file_name_off;
|
|
__u32 line_off;
|
|
__u32 line_col;
|
|
};
|
|
|
|
struct bpf_spin_lock {
|
|
__u32 val;
|
|
};
|
|
|
|
struct bpf_timer {
|
|
__u64 :64;
|
|
__u64 :64;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_dynptr {
|
|
__u64 :64;
|
|
__u64 :64;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_list_head {
|
|
__u64 :64;
|
|
__u64 :64;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_list_node {
|
|
__u64 :64;
|
|
__u64 :64;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_rb_root {
|
|
__u64 :64;
|
|
__u64 :64;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_rb_node {
|
|
__u64 :64;
|
|
__u64 :64;
|
|
__u64 :64;
|
|
} __attribute__((aligned(8)));
|
|
|
|
struct bpf_refcount {
|
|
__u32 :32;
|
|
} __attribute__((aligned(4)));
|
|
|
|
struct bpf_sysctl {
|
|
__u32 write; /* Sysctl is being read (= 0) or written (= 1).
|
|
* Allows 1,2,4-byte read, but no write.
|
|
*/
|
|
__u32 file_pos; /* Sysctl file position to read from, write to.
|
|
* Allows 1,2,4-byte read an 4-byte write.
|
|
*/
|
|
};
|
|
|
|
struct bpf_sockopt {
|
|
__bpf_md_ptr(struct bpf_sock *, sk);
|
|
__bpf_md_ptr(void *, optval);
|
|
__bpf_md_ptr(void *, optval_end);
|
|
|
|
__s32 level;
|
|
__s32 optname;
|
|
__s32 optlen;
|
|
__s32 retval;
|
|
};
|
|
|
|
struct bpf_pidns_info {
|
|
__u32 pid;
|
|
__u32 tgid;
|
|
};
|
|
|
|
/* User accessible data for SK_LOOKUP programs. Add new fields at the end. */
|
|
struct bpf_sk_lookup {
|
|
union {
|
|
__bpf_md_ptr(struct bpf_sock *, sk); /* Selected socket */
|
|
__u64 cookie; /* Non-zero if socket was selected in PROG_TEST_RUN */
|
|
};
|
|
|
|
__u32 family; /* Protocol family (AF_INET, AF_INET6) */
|
|
__u32 protocol; /* IP protocol (IPPROTO_TCP, IPPROTO_UDP) */
|
|
__u32 remote_ip4; /* Network byte order */
|
|
__u32 remote_ip6[4]; /* Network byte order */
|
|
__be16 remote_port; /* Network byte order */
|
|
__u16 :16; /* Zero padding */
|
|
__u32 local_ip4; /* Network byte order */
|
|
__u32 local_ip6[4]; /* Network byte order */
|
|
__u32 local_port; /* Host byte order */
|
|
__u32 ingress_ifindex; /* The arriving interface. Determined by inet_iif. */
|
|
};
|
|
|
|
/*
|
|
* struct btf_ptr is used for typed pointer representation; the
|
|
* type id is used to render the pointer data as the appropriate type
|
|
* via the bpf_snprintf_btf() helper described above. A flags field -
|
|
* potentially to specify additional details about the BTF pointer
|
|
* (rather than its mode of display) - is included for future use.
|
|
* Display flags - BTF_F_* - are passed to bpf_snprintf_btf separately.
|
|
*/
|
|
struct btf_ptr {
|
|
void *ptr;
|
|
__u32 type_id;
|
|
__u32 flags; /* BTF ptr flags; unused at present. */
|
|
};
|
|
|
|
/*
|
|
* Flags to control bpf_snprintf_btf() behaviour.
|
|
* - BTF_F_COMPACT: no formatting around type information
|
|
* - BTF_F_NONAME: no struct/union member names/types
|
|
* - BTF_F_PTR_RAW: show raw (unobfuscated) pointer values;
|
|
* equivalent to %px.
|
|
* - BTF_F_ZERO: show zero-valued struct/union members; they
|
|
* are not displayed by default
|
|
*/
|
|
enum {
|
|
BTF_F_COMPACT = (1ULL << 0),
|
|
BTF_F_NONAME = (1ULL << 1),
|
|
BTF_F_PTR_RAW = (1ULL << 2),
|
|
BTF_F_ZERO = (1ULL << 3),
|
|
};
|
|
|
|
/* bpf_core_relo_kind encodes which aspect of captured field/type/enum value
|
|
* has to be adjusted by relocations. It is emitted by llvm and passed to
|
|
* libbpf and later to the kernel.
|
|
*/
|
|
enum bpf_core_relo_kind {
|
|
BPF_CORE_FIELD_BYTE_OFFSET = 0, /* field byte offset */
|
|
BPF_CORE_FIELD_BYTE_SIZE = 1, /* field size in bytes */
|
|
BPF_CORE_FIELD_EXISTS = 2, /* field existence in target kernel */
|
|
BPF_CORE_FIELD_SIGNED = 3, /* field signedness (0 - unsigned, 1 - signed) */
|
|
BPF_CORE_FIELD_LSHIFT_U64 = 4, /* bitfield-specific left bitshift */
|
|
BPF_CORE_FIELD_RSHIFT_U64 = 5, /* bitfield-specific right bitshift */
|
|
BPF_CORE_TYPE_ID_LOCAL = 6, /* type ID in local BPF object */
|
|
BPF_CORE_TYPE_ID_TARGET = 7, /* type ID in target kernel */
|
|
BPF_CORE_TYPE_EXISTS = 8, /* type existence in target kernel */
|
|
BPF_CORE_TYPE_SIZE = 9, /* type size in bytes */
|
|
BPF_CORE_ENUMVAL_EXISTS = 10, /* enum value existence in target kernel */
|
|
BPF_CORE_ENUMVAL_VALUE = 11, /* enum value integer value */
|
|
BPF_CORE_TYPE_MATCHES = 12, /* type match in target kernel */
|
|
};
|
|
|
|
/*
|
|
* "struct bpf_core_relo" is used to pass relocation data form LLVM to libbpf
|
|
* and from libbpf to the kernel.
|
|
*
|
|
* CO-RE relocation captures the following data:
|
|
* - insn_off - instruction offset (in bytes) within a BPF program that needs
|
|
* its insn->imm field to be relocated with actual field info;
|
|
* - type_id - BTF type ID of the "root" (containing) entity of a relocatable
|
|
* type or field;
|
|
* - access_str_off - offset into corresponding .BTF string section. String
|
|
* interpretation depends on specific relocation kind:
|
|
* - for field-based relocations, string encodes an accessed field using
|
|
* a sequence of field and array indices, separated by colon (:). It's
|
|
* conceptually very close to LLVM's getelementptr ([0]) instruction's
|
|
* arguments for identifying offset to a field.
|
|
* - for type-based relocations, strings is expected to be just "0";
|
|
* - for enum value-based relocations, string contains an index of enum
|
|
* value within its enum type;
|
|
* - kind - one of enum bpf_core_relo_kind;
|
|
*
|
|
* Example:
|
|
* struct sample {
|
|
* int a;
|
|
* struct {
|
|
* int b[10];
|
|
* };
|
|
* };
|
|
*
|
|
* struct sample *s = ...;
|
|
* int *x = &s->a; // encoded as "0:0" (a is field #0)
|
|
* int *y = &s->b[5]; // encoded as "0:1:0:5" (anon struct is field #1,
|
|
* // b is field #0 inside anon struct, accessing elem #5)
|
|
* int *z = &s[10]->b; // encoded as "10:1" (ptr is used as an array)
|
|
*
|
|
* type_id for all relocs in this example will capture BTF type id of
|
|
* `struct sample`.
|
|
*
|
|
* Such relocation is emitted when using __builtin_preserve_access_index()
|
|
* Clang built-in, passing expression that captures field address, e.g.:
|
|
*
|
|
* bpf_probe_read(&dst, sizeof(dst),
|
|
* __builtin_preserve_access_index(&src->a.b.c));
|
|
*
|
|
* In this case Clang will emit field relocation recording necessary data to
|
|
* be able to find offset of embedded `a.b.c` field within `src` struct.
|
|
*
|
|
* [0] https://llvm.org/docs/LangRef.html#getelementptr-instruction
|
|
*/
|
|
struct bpf_core_relo {
|
|
__u32 insn_off;
|
|
__u32 type_id;
|
|
__u32 access_str_off;
|
|
enum bpf_core_relo_kind kind;
|
|
};
|
|
|
|
/*
|
|
* Flags to control bpf_timer_start() behaviour.
|
|
* - BPF_F_TIMER_ABS: Timeout passed is absolute time, by default it is
|
|
* relative to current time.
|
|
*/
|
|
enum {
|
|
BPF_F_TIMER_ABS = (1ULL << 0),
|
|
};
|
|
|
|
/* BPF numbers iterator state */
|
|
struct bpf_iter_num {
|
|
/* opaque iterator state; having __u64 here allows to preserve correct
|
|
* alignment requirements in vmlinux.h, generated from BTF
|
|
*/
|
|
__u64 __opaque[1];
|
|
} __attribute__((aligned(8)));
|
|
|
|
#endif /* _UAPI__LINUX_BPF_H__ */
|