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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![YiFei Zhu](/assets/img/avatar_default.png)
To support modifying the used_maps array, we use a mutex to protect the use of the counter and the array. The mutex is initialized right after the prog aux is allocated, and destroyed right before prog aux is freed. This way we guarantee it's initialized for both cBPF and eBPF. Signed-off-by: YiFei Zhu <zhuyifei@google.com> Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Cc: YiFei Zhu <zhuyifei1999@gmail.com> Link: https://lore.kernel.org/bpf/20200915234543.3220146-2-sdf@google.com
1906 lines
60 KiB
C
1906 lines
60 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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*/
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#ifndef _LINUX_BPF_H
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#define _LINUX_BPF_H 1
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#include <uapi/linux/bpf.h>
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#include <linux/workqueue.h>
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#include <linux/file.h>
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#include <linux/percpu.h>
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#include <linux/err.h>
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#include <linux/rbtree_latch.h>
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#include <linux/numa.h>
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#include <linux/mm_types.h>
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#include <linux/wait.h>
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#include <linux/u64_stats_sync.h>
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#include <linux/refcount.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/capability.h>
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struct bpf_verifier_env;
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struct bpf_verifier_log;
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struct perf_event;
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struct bpf_prog;
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struct bpf_prog_aux;
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struct bpf_map;
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struct sock;
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struct seq_file;
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struct btf;
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struct btf_type;
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struct exception_table_entry;
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struct seq_operations;
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struct bpf_iter_aux_info;
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struct bpf_local_storage;
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struct bpf_local_storage_map;
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extern struct idr btf_idr;
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extern spinlock_t btf_idr_lock;
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typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
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struct bpf_iter_aux_info *aux);
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typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
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struct bpf_iter_seq_info {
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const struct seq_operations *seq_ops;
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bpf_iter_init_seq_priv_t init_seq_private;
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bpf_iter_fini_seq_priv_t fini_seq_private;
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u32 seq_priv_size;
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};
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/* map is generic key/value storage optionally accesible by eBPF programs */
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struct bpf_map_ops {
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/* funcs callable from userspace (via syscall) */
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int (*map_alloc_check)(union bpf_attr *attr);
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struct bpf_map *(*map_alloc)(union bpf_attr *attr);
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void (*map_release)(struct bpf_map *map, struct file *map_file);
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void (*map_free)(struct bpf_map *map);
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int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
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void (*map_release_uref)(struct bpf_map *map);
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void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
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int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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int (*map_lookup_and_delete_batch)(struct bpf_map *map,
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const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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/* funcs callable from userspace and from eBPF programs */
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void *(*map_lookup_elem)(struct bpf_map *map, void *key);
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int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
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int (*map_delete_elem)(struct bpf_map *map, void *key);
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int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
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int (*map_pop_elem)(struct bpf_map *map, void *value);
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int (*map_peek_elem)(struct bpf_map *map, void *value);
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/* funcs called by prog_array and perf_event_array map */
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void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
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int fd);
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void (*map_fd_put_ptr)(void *ptr);
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u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
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u32 (*map_fd_sys_lookup_elem)(void *ptr);
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void (*map_seq_show_elem)(struct bpf_map *map, void *key,
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struct seq_file *m);
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int (*map_check_btf)(const struct bpf_map *map,
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const struct btf *btf,
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const struct btf_type *key_type,
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const struct btf_type *value_type);
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/* Prog poke tracking helpers. */
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int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
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void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
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void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
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struct bpf_prog *new);
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/* Direct value access helpers. */
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int (*map_direct_value_addr)(const struct bpf_map *map,
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u64 *imm, u32 off);
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int (*map_direct_value_meta)(const struct bpf_map *map,
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u64 imm, u32 *off);
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int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
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__poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
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struct poll_table_struct *pts);
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/* Functions called by bpf_local_storage maps */
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int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
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void *owner, u32 size);
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void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
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void *owner, u32 size);
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struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
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/* map_meta_equal must be implemented for maps that can be
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* used as an inner map. It is a runtime check to ensure
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* an inner map can be inserted to an outer map.
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*
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* Some properties of the inner map has been used during the
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* verification time. When inserting an inner map at the runtime,
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* map_meta_equal has to ensure the inserting map has the same
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* properties that the verifier has used earlier.
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*/
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bool (*map_meta_equal)(const struct bpf_map *meta0,
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const struct bpf_map *meta1);
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/* BTF name and id of struct allocated by map_alloc */
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const char * const map_btf_name;
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int *map_btf_id;
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/* bpf_iter info used to open a seq_file */
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const struct bpf_iter_seq_info *iter_seq_info;
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};
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struct bpf_map_memory {
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u32 pages;
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struct user_struct *user;
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};
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struct bpf_map {
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/* The first two cachelines with read-mostly members of which some
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* are also accessed in fast-path (e.g. ops, max_entries).
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*/
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const struct bpf_map_ops *ops ____cacheline_aligned;
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struct bpf_map *inner_map_meta;
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#ifdef CONFIG_SECURITY
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void *security;
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#endif
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enum bpf_map_type map_type;
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u32 key_size;
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u32 value_size;
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u32 max_entries;
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u32 map_flags;
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int spin_lock_off; /* >=0 valid offset, <0 error */
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u32 id;
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int numa_node;
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u32 btf_key_type_id;
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u32 btf_value_type_id;
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struct btf *btf;
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struct bpf_map_memory memory;
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char name[BPF_OBJ_NAME_LEN];
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u32 btf_vmlinux_value_type_id;
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bool bypass_spec_v1;
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bool frozen; /* write-once; write-protected by freeze_mutex */
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/* 22 bytes hole */
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/* The 3rd and 4th cacheline with misc members to avoid false sharing
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* particularly with refcounting.
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*/
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atomic64_t refcnt ____cacheline_aligned;
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atomic64_t usercnt;
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struct work_struct work;
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struct mutex freeze_mutex;
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u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
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};
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static inline bool map_value_has_spin_lock(const struct bpf_map *map)
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{
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return map->spin_lock_off >= 0;
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}
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static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
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{
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if (likely(!map_value_has_spin_lock(map)))
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return;
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*(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
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(struct bpf_spin_lock){};
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}
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/* copy everything but bpf_spin_lock */
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static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
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{
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if (unlikely(map_value_has_spin_lock(map))) {
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u32 off = map->spin_lock_off;
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memcpy(dst, src, off);
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memcpy(dst + off + sizeof(struct bpf_spin_lock),
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src + off + sizeof(struct bpf_spin_lock),
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map->value_size - off - sizeof(struct bpf_spin_lock));
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} else {
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memcpy(dst, src, map->value_size);
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}
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}
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void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
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bool lock_src);
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int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
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struct bpf_offload_dev;
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struct bpf_offloaded_map;
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struct bpf_map_dev_ops {
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int (*map_get_next_key)(struct bpf_offloaded_map *map,
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void *key, void *next_key);
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int (*map_lookup_elem)(struct bpf_offloaded_map *map,
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void *key, void *value);
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int (*map_update_elem)(struct bpf_offloaded_map *map,
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void *key, void *value, u64 flags);
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int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
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};
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struct bpf_offloaded_map {
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struct bpf_map map;
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struct net_device *netdev;
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const struct bpf_map_dev_ops *dev_ops;
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void *dev_priv;
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struct list_head offloads;
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};
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static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
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{
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return container_of(map, struct bpf_offloaded_map, map);
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}
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static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
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{
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return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
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}
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static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
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{
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return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
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map->ops->map_seq_show_elem;
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}
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int map_check_no_btf(const struct bpf_map *map,
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const struct btf *btf,
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const struct btf_type *key_type,
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const struct btf_type *value_type);
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bool bpf_map_meta_equal(const struct bpf_map *meta0,
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const struct bpf_map *meta1);
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extern const struct bpf_map_ops bpf_map_offload_ops;
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/* function argument constraints */
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enum bpf_arg_type {
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ARG_DONTCARE = 0, /* unused argument in helper function */
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/* the following constraints used to prototype
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* bpf_map_lookup/update/delete_elem() functions
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*/
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ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
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ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
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ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
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ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
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ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */
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/* the following constraints used to prototype bpf_memcmp() and other
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* functions that access data on eBPF program stack
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*/
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ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
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ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
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ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
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* helper function must fill all bytes or clear
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* them in error case.
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*/
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ARG_CONST_SIZE, /* number of bytes accessed from memory */
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ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
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ARG_PTR_TO_CTX, /* pointer to context */
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ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
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ARG_ANYTHING, /* any (initialized) argument is ok */
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ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
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ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
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ARG_PTR_TO_INT, /* pointer to int */
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ARG_PTR_TO_LONG, /* pointer to long */
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ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
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ARG_PTR_TO_SOCKET_OR_NULL, /* pointer to bpf_sock (fullsock) or NULL */
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ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
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ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
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ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */
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ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
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};
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/* type of values returned from helper functions */
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enum bpf_return_type {
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RET_INTEGER, /* function returns integer */
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RET_VOID, /* function doesn't return anything */
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RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
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RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
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RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */
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RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */
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RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
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RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */
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RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */
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};
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/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
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* to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
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* instructions after verifying
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*/
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struct bpf_func_proto {
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u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
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bool gpl_only;
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bool pkt_access;
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enum bpf_return_type ret_type;
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union {
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struct {
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enum bpf_arg_type arg1_type;
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enum bpf_arg_type arg2_type;
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enum bpf_arg_type arg3_type;
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enum bpf_arg_type arg4_type;
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enum bpf_arg_type arg5_type;
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};
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enum bpf_arg_type arg_type[5];
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};
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int *btf_id; /* BTF ids of arguments */
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bool (*check_btf_id)(u32 btf_id, u32 arg); /* if the argument btf_id is
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* valid. Often used if more
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* than one btf id is permitted
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* for this argument.
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*/
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int *ret_btf_id; /* return value btf_id */
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bool (*allowed)(const struct bpf_prog *prog);
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};
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/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
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* the first argument to eBPF programs.
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* For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
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*/
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struct bpf_context;
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enum bpf_access_type {
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BPF_READ = 1,
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BPF_WRITE = 2
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};
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/* types of values stored in eBPF registers */
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/* Pointer types represent:
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* pointer
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* pointer + imm
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* pointer + (u16) var
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* pointer + (u16) var + imm
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* if (range > 0) then [ptr, ptr + range - off) is safe to access
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* if (id > 0) means that some 'var' was added
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* if (off > 0) means that 'imm' was added
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*/
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enum bpf_reg_type {
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NOT_INIT = 0, /* nothing was written into register */
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SCALAR_VALUE, /* reg doesn't contain a valid pointer */
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PTR_TO_CTX, /* reg points to bpf_context */
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CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
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PTR_TO_MAP_VALUE, /* reg points to map element value */
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PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
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PTR_TO_STACK, /* reg == frame_pointer + offset */
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PTR_TO_PACKET_META, /* skb->data - meta_len */
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PTR_TO_PACKET, /* reg points to skb->data */
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PTR_TO_PACKET_END, /* skb->data + headlen */
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PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
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PTR_TO_SOCKET, /* reg points to struct bpf_sock */
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PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */
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PTR_TO_SOCK_COMMON, /* reg points to sock_common */
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PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
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PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
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PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
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PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
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PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
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PTR_TO_BTF_ID, /* reg points to kernel struct */
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PTR_TO_BTF_ID_OR_NULL, /* reg points to kernel struct or NULL */
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PTR_TO_MEM, /* reg points to valid memory region */
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PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */
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PTR_TO_RDONLY_BUF, /* reg points to a readonly buffer */
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PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */
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PTR_TO_RDWR_BUF, /* reg points to a read/write buffer */
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PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */
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};
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/* The information passed from prog-specific *_is_valid_access
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* back to the verifier.
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*/
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struct bpf_insn_access_aux {
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enum bpf_reg_type reg_type;
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union {
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int ctx_field_size;
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u32 btf_id;
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};
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struct bpf_verifier_log *log; /* for verbose logs */
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};
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static inline void
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bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
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{
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aux->ctx_field_size = size;
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}
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struct bpf_prog_ops {
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int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
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union bpf_attr __user *uattr);
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};
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struct bpf_verifier_ops {
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/* return eBPF function prototype for verification */
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const struct bpf_func_proto *
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(*get_func_proto)(enum bpf_func_id func_id,
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const struct bpf_prog *prog);
|
|
|
|
/* return true if 'size' wide access at offset 'off' within bpf_context
|
|
* with 'type' (read or write) is allowed
|
|
*/
|
|
bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
|
|
const struct bpf_prog *prog,
|
|
struct bpf_insn_access_aux *info);
|
|
int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
|
|
const struct bpf_prog *prog);
|
|
int (*gen_ld_abs)(const struct bpf_insn *orig,
|
|
struct bpf_insn *insn_buf);
|
|
u32 (*convert_ctx_access)(enum bpf_access_type type,
|
|
const struct bpf_insn *src,
|
|
struct bpf_insn *dst,
|
|
struct bpf_prog *prog, u32 *target_size);
|
|
int (*btf_struct_access)(struct bpf_verifier_log *log,
|
|
const struct btf_type *t, int off, int size,
|
|
enum bpf_access_type atype,
|
|
u32 *next_btf_id);
|
|
};
|
|
|
|
struct bpf_prog_offload_ops {
|
|
/* verifier basic callbacks */
|
|
int (*insn_hook)(struct bpf_verifier_env *env,
|
|
int insn_idx, int prev_insn_idx);
|
|
int (*finalize)(struct bpf_verifier_env *env);
|
|
/* verifier optimization callbacks (called after .finalize) */
|
|
int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
|
|
struct bpf_insn *insn);
|
|
int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
|
|
/* program management callbacks */
|
|
int (*prepare)(struct bpf_prog *prog);
|
|
int (*translate)(struct bpf_prog *prog);
|
|
void (*destroy)(struct bpf_prog *prog);
|
|
};
|
|
|
|
struct bpf_prog_offload {
|
|
struct bpf_prog *prog;
|
|
struct net_device *netdev;
|
|
struct bpf_offload_dev *offdev;
|
|
void *dev_priv;
|
|
struct list_head offloads;
|
|
bool dev_state;
|
|
bool opt_failed;
|
|
void *jited_image;
|
|
u32 jited_len;
|
|
};
|
|
|
|
enum bpf_cgroup_storage_type {
|
|
BPF_CGROUP_STORAGE_SHARED,
|
|
BPF_CGROUP_STORAGE_PERCPU,
|
|
__BPF_CGROUP_STORAGE_MAX
|
|
};
|
|
|
|
#define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
|
|
|
|
/* The longest tracepoint has 12 args.
|
|
* See include/trace/bpf_probe.h
|
|
*/
|
|
#define MAX_BPF_FUNC_ARGS 12
|
|
|
|
struct bpf_prog_stats {
|
|
u64 cnt;
|
|
u64 nsecs;
|
|
struct u64_stats_sync syncp;
|
|
} __aligned(2 * sizeof(u64));
|
|
|
|
struct btf_func_model {
|
|
u8 ret_size;
|
|
u8 nr_args;
|
|
u8 arg_size[MAX_BPF_FUNC_ARGS];
|
|
};
|
|
|
|
/* Restore arguments before returning from trampoline to let original function
|
|
* continue executing. This flag is used for fentry progs when there are no
|
|
* fexit progs.
|
|
*/
|
|
#define BPF_TRAMP_F_RESTORE_REGS BIT(0)
|
|
/* Call original function after fentry progs, but before fexit progs.
|
|
* Makes sense for fentry/fexit, normal calls and indirect calls.
|
|
*/
|
|
#define BPF_TRAMP_F_CALL_ORIG BIT(1)
|
|
/* Skip current frame and return to parent. Makes sense for fentry/fexit
|
|
* programs only. Should not be used with normal calls and indirect calls.
|
|
*/
|
|
#define BPF_TRAMP_F_SKIP_FRAME BIT(2)
|
|
|
|
/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
|
|
* bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
|
|
*/
|
|
#define BPF_MAX_TRAMP_PROGS 40
|
|
|
|
struct bpf_tramp_progs {
|
|
struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
|
|
int nr_progs;
|
|
};
|
|
|
|
/* Different use cases for BPF trampoline:
|
|
* 1. replace nop at the function entry (kprobe equivalent)
|
|
* flags = BPF_TRAMP_F_RESTORE_REGS
|
|
* fentry = a set of programs to run before returning from trampoline
|
|
*
|
|
* 2. replace nop at the function entry (kprobe + kretprobe equivalent)
|
|
* flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
|
|
* orig_call = fentry_ip + MCOUNT_INSN_SIZE
|
|
* fentry = a set of program to run before calling original function
|
|
* fexit = a set of program to run after original function
|
|
*
|
|
* 3. replace direct call instruction anywhere in the function body
|
|
* or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
|
|
* With flags = 0
|
|
* fentry = a set of programs to run before returning from trampoline
|
|
* With flags = BPF_TRAMP_F_CALL_ORIG
|
|
* orig_call = original callback addr or direct function addr
|
|
* fentry = a set of program to run before calling original function
|
|
* fexit = a set of program to run after original function
|
|
*/
|
|
int arch_prepare_bpf_trampoline(void *image, void *image_end,
|
|
const struct btf_func_model *m, u32 flags,
|
|
struct bpf_tramp_progs *tprogs,
|
|
void *orig_call);
|
|
/* these two functions are called from generated trampoline */
|
|
u64 notrace __bpf_prog_enter(void);
|
|
void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
|
|
void notrace __bpf_prog_enter_sleepable(void);
|
|
void notrace __bpf_prog_exit_sleepable(void);
|
|
|
|
struct bpf_ksym {
|
|
unsigned long start;
|
|
unsigned long end;
|
|
char name[KSYM_NAME_LEN];
|
|
struct list_head lnode;
|
|
struct latch_tree_node tnode;
|
|
bool prog;
|
|
};
|
|
|
|
enum bpf_tramp_prog_type {
|
|
BPF_TRAMP_FENTRY,
|
|
BPF_TRAMP_FEXIT,
|
|
BPF_TRAMP_MODIFY_RETURN,
|
|
BPF_TRAMP_MAX,
|
|
BPF_TRAMP_REPLACE, /* more than MAX */
|
|
};
|
|
|
|
struct bpf_trampoline {
|
|
/* hlist for trampoline_table */
|
|
struct hlist_node hlist;
|
|
/* serializes access to fields of this trampoline */
|
|
struct mutex mutex;
|
|
refcount_t refcnt;
|
|
u64 key;
|
|
struct {
|
|
struct btf_func_model model;
|
|
void *addr;
|
|
bool ftrace_managed;
|
|
} func;
|
|
/* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
|
|
* program by replacing one of its functions. func.addr is the address
|
|
* of the function it replaced.
|
|
*/
|
|
struct bpf_prog *extension_prog;
|
|
/* list of BPF programs using this trampoline */
|
|
struct hlist_head progs_hlist[BPF_TRAMP_MAX];
|
|
/* Number of attached programs. A counter per kind. */
|
|
int progs_cnt[BPF_TRAMP_MAX];
|
|
/* Executable image of trampoline */
|
|
void *image;
|
|
u64 selector;
|
|
struct bpf_ksym ksym;
|
|
};
|
|
|
|
#define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
|
|
|
|
struct bpf_dispatcher_prog {
|
|
struct bpf_prog *prog;
|
|
refcount_t users;
|
|
};
|
|
|
|
struct bpf_dispatcher {
|
|
/* dispatcher mutex */
|
|
struct mutex mutex;
|
|
void *func;
|
|
struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
|
|
int num_progs;
|
|
void *image;
|
|
u32 image_off;
|
|
struct bpf_ksym ksym;
|
|
};
|
|
|
|
static __always_inline unsigned int bpf_dispatcher_nop_func(
|
|
const void *ctx,
|
|
const struct bpf_insn *insnsi,
|
|
unsigned int (*bpf_func)(const void *,
|
|
const struct bpf_insn *))
|
|
{
|
|
return bpf_func(ctx, insnsi);
|
|
}
|
|
#ifdef CONFIG_BPF_JIT
|
|
struct bpf_trampoline *bpf_trampoline_lookup(u64 key);
|
|
int bpf_trampoline_link_prog(struct bpf_prog *prog);
|
|
int bpf_trampoline_unlink_prog(struct bpf_prog *prog);
|
|
void bpf_trampoline_put(struct bpf_trampoline *tr);
|
|
#define BPF_DISPATCHER_INIT(_name) { \
|
|
.mutex = __MUTEX_INITIALIZER(_name.mutex), \
|
|
.func = &_name##_func, \
|
|
.progs = {}, \
|
|
.num_progs = 0, \
|
|
.image = NULL, \
|
|
.image_off = 0, \
|
|
.ksym = { \
|
|
.name = #_name, \
|
|
.lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
|
|
}, \
|
|
}
|
|
|
|
#define DEFINE_BPF_DISPATCHER(name) \
|
|
noinline unsigned int bpf_dispatcher_##name##_func( \
|
|
const void *ctx, \
|
|
const struct bpf_insn *insnsi, \
|
|
unsigned int (*bpf_func)(const void *, \
|
|
const struct bpf_insn *)) \
|
|
{ \
|
|
return bpf_func(ctx, insnsi); \
|
|
} \
|
|
EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
|
|
struct bpf_dispatcher bpf_dispatcher_##name = \
|
|
BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
|
|
#define DECLARE_BPF_DISPATCHER(name) \
|
|
unsigned int bpf_dispatcher_##name##_func( \
|
|
const void *ctx, \
|
|
const struct bpf_insn *insnsi, \
|
|
unsigned int (*bpf_func)(const void *, \
|
|
const struct bpf_insn *)); \
|
|
extern struct bpf_dispatcher bpf_dispatcher_##name;
|
|
#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
|
|
#define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
|
|
void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
|
|
struct bpf_prog *to);
|
|
/* Called only from JIT-enabled code, so there's no need for stubs. */
|
|
void *bpf_jit_alloc_exec_page(void);
|
|
void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
|
|
void bpf_image_ksym_del(struct bpf_ksym *ksym);
|
|
void bpf_ksym_add(struct bpf_ksym *ksym);
|
|
void bpf_ksym_del(struct bpf_ksym *ksym);
|
|
#else
|
|
static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline int bpf_trampoline_link_prog(struct bpf_prog *prog)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
|
|
#define DEFINE_BPF_DISPATCHER(name)
|
|
#define DECLARE_BPF_DISPATCHER(name)
|
|
#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
|
|
#define BPF_DISPATCHER_PTR(name) NULL
|
|
static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
|
|
struct bpf_prog *from,
|
|
struct bpf_prog *to) {}
|
|
static inline bool is_bpf_image_address(unsigned long address)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
struct bpf_func_info_aux {
|
|
u16 linkage;
|
|
bool unreliable;
|
|
};
|
|
|
|
enum bpf_jit_poke_reason {
|
|
BPF_POKE_REASON_TAIL_CALL,
|
|
};
|
|
|
|
/* Descriptor of pokes pointing /into/ the JITed image. */
|
|
struct bpf_jit_poke_descriptor {
|
|
void *ip;
|
|
union {
|
|
struct {
|
|
struct bpf_map *map;
|
|
u32 key;
|
|
} tail_call;
|
|
};
|
|
bool ip_stable;
|
|
u8 adj_off;
|
|
u16 reason;
|
|
};
|
|
|
|
/* reg_type info for ctx arguments */
|
|
struct bpf_ctx_arg_aux {
|
|
u32 offset;
|
|
enum bpf_reg_type reg_type;
|
|
u32 btf_id;
|
|
};
|
|
|
|
struct bpf_prog_aux {
|
|
atomic64_t refcnt;
|
|
u32 used_map_cnt;
|
|
u32 max_ctx_offset;
|
|
u32 max_pkt_offset;
|
|
u32 max_tp_access;
|
|
u32 stack_depth;
|
|
u32 id;
|
|
u32 func_cnt; /* used by non-func prog as the number of func progs */
|
|
u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
|
|
u32 attach_btf_id; /* in-kernel BTF type id to attach to */
|
|
u32 ctx_arg_info_size;
|
|
u32 max_rdonly_access;
|
|
u32 max_rdwr_access;
|
|
const struct bpf_ctx_arg_aux *ctx_arg_info;
|
|
struct bpf_prog *linked_prog;
|
|
bool verifier_zext; /* Zero extensions has been inserted by verifier. */
|
|
bool offload_requested;
|
|
bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
|
|
bool func_proto_unreliable;
|
|
bool sleepable;
|
|
enum bpf_tramp_prog_type trampoline_prog_type;
|
|
struct bpf_trampoline *trampoline;
|
|
struct hlist_node tramp_hlist;
|
|
/* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
|
|
const struct btf_type *attach_func_proto;
|
|
/* function name for valid attach_btf_id */
|
|
const char *attach_func_name;
|
|
struct bpf_prog **func;
|
|
void *jit_data; /* JIT specific data. arch dependent */
|
|
struct bpf_jit_poke_descriptor *poke_tab;
|
|
u32 size_poke_tab;
|
|
struct bpf_ksym ksym;
|
|
const struct bpf_prog_ops *ops;
|
|
struct bpf_map **used_maps;
|
|
struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
|
|
struct bpf_prog *prog;
|
|
struct user_struct *user;
|
|
u64 load_time; /* ns since boottime */
|
|
struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
|
|
char name[BPF_OBJ_NAME_LEN];
|
|
#ifdef CONFIG_SECURITY
|
|
void *security;
|
|
#endif
|
|
struct bpf_prog_offload *offload;
|
|
struct btf *btf;
|
|
struct bpf_func_info *func_info;
|
|
struct bpf_func_info_aux *func_info_aux;
|
|
/* bpf_line_info loaded from userspace. linfo->insn_off
|
|
* has the xlated insn offset.
|
|
* Both the main and sub prog share the same linfo.
|
|
* The subprog can access its first linfo by
|
|
* using the linfo_idx.
|
|
*/
|
|
struct bpf_line_info *linfo;
|
|
/* jited_linfo is the jited addr of the linfo. It has a
|
|
* one to one mapping to linfo:
|
|
* jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
|
|
* Both the main and sub prog share the same jited_linfo.
|
|
* The subprog can access its first jited_linfo by
|
|
* using the linfo_idx.
|
|
*/
|
|
void **jited_linfo;
|
|
u32 func_info_cnt;
|
|
u32 nr_linfo;
|
|
/* subprog can use linfo_idx to access its first linfo and
|
|
* jited_linfo.
|
|
* main prog always has linfo_idx == 0
|
|
*/
|
|
u32 linfo_idx;
|
|
u32 num_exentries;
|
|
struct exception_table_entry *extable;
|
|
struct bpf_prog_stats __percpu *stats;
|
|
union {
|
|
struct work_struct work;
|
|
struct rcu_head rcu;
|
|
};
|
|
};
|
|
|
|
struct bpf_array_aux {
|
|
/* 'Ownership' of prog array is claimed by the first program that
|
|
* is going to use this map or by the first program which FD is
|
|
* stored in the map to make sure that all callers and callees have
|
|
* the same prog type and JITed flag.
|
|
*/
|
|
enum bpf_prog_type type;
|
|
bool jited;
|
|
/* Programs with direct jumps into programs part of this array. */
|
|
struct list_head poke_progs;
|
|
struct bpf_map *map;
|
|
struct mutex poke_mutex;
|
|
struct work_struct work;
|
|
};
|
|
|
|
struct bpf_link {
|
|
atomic64_t refcnt;
|
|
u32 id;
|
|
enum bpf_link_type type;
|
|
const struct bpf_link_ops *ops;
|
|
struct bpf_prog *prog;
|
|
struct work_struct work;
|
|
};
|
|
|
|
struct bpf_link_ops {
|
|
void (*release)(struct bpf_link *link);
|
|
void (*dealloc)(struct bpf_link *link);
|
|
int (*detach)(struct bpf_link *link);
|
|
int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
|
|
struct bpf_prog *old_prog);
|
|
void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
|
|
int (*fill_link_info)(const struct bpf_link *link,
|
|
struct bpf_link_info *info);
|
|
};
|
|
|
|
struct bpf_link_primer {
|
|
struct bpf_link *link;
|
|
struct file *file;
|
|
int fd;
|
|
u32 id;
|
|
};
|
|
|
|
struct bpf_struct_ops_value;
|
|
struct btf_type;
|
|
struct btf_member;
|
|
|
|
#define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
|
|
struct bpf_struct_ops {
|
|
const struct bpf_verifier_ops *verifier_ops;
|
|
int (*init)(struct btf *btf);
|
|
int (*check_member)(const struct btf_type *t,
|
|
const struct btf_member *member);
|
|
int (*init_member)(const struct btf_type *t,
|
|
const struct btf_member *member,
|
|
void *kdata, const void *udata);
|
|
int (*reg)(void *kdata);
|
|
void (*unreg)(void *kdata);
|
|
const struct btf_type *type;
|
|
const struct btf_type *value_type;
|
|
const char *name;
|
|
struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
|
|
u32 type_id;
|
|
u32 value_id;
|
|
};
|
|
|
|
#if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
|
|
#define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
|
|
const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
|
|
void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
|
|
bool bpf_struct_ops_get(const void *kdata);
|
|
void bpf_struct_ops_put(const void *kdata);
|
|
int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
|
|
void *value);
|
|
static inline bool bpf_try_module_get(const void *data, struct module *owner)
|
|
{
|
|
if (owner == BPF_MODULE_OWNER)
|
|
return bpf_struct_ops_get(data);
|
|
else
|
|
return try_module_get(owner);
|
|
}
|
|
static inline void bpf_module_put(const void *data, struct module *owner)
|
|
{
|
|
if (owner == BPF_MODULE_OWNER)
|
|
bpf_struct_ops_put(data);
|
|
else
|
|
module_put(owner);
|
|
}
|
|
#else
|
|
static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline void bpf_struct_ops_init(struct btf *btf,
|
|
struct bpf_verifier_log *log)
|
|
{
|
|
}
|
|
static inline bool bpf_try_module_get(const void *data, struct module *owner)
|
|
{
|
|
return try_module_get(owner);
|
|
}
|
|
static inline void bpf_module_put(const void *data, struct module *owner)
|
|
{
|
|
module_put(owner);
|
|
}
|
|
static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
|
|
void *key,
|
|
void *value)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
struct bpf_array {
|
|
struct bpf_map map;
|
|
u32 elem_size;
|
|
u32 index_mask;
|
|
struct bpf_array_aux *aux;
|
|
union {
|
|
char value[0] __aligned(8);
|
|
void *ptrs[0] __aligned(8);
|
|
void __percpu *pptrs[0] __aligned(8);
|
|
};
|
|
};
|
|
|
|
#define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
|
|
#define MAX_TAIL_CALL_CNT 32
|
|
|
|
#define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
|
|
BPF_F_RDONLY_PROG | \
|
|
BPF_F_WRONLY | \
|
|
BPF_F_WRONLY_PROG)
|
|
|
|
#define BPF_MAP_CAN_READ BIT(0)
|
|
#define BPF_MAP_CAN_WRITE BIT(1)
|
|
|
|
static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
|
|
{
|
|
u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
|
|
|
|
/* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
|
|
* not possible.
|
|
*/
|
|
if (access_flags & BPF_F_RDONLY_PROG)
|
|
return BPF_MAP_CAN_READ;
|
|
else if (access_flags & BPF_F_WRONLY_PROG)
|
|
return BPF_MAP_CAN_WRITE;
|
|
else
|
|
return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
|
|
}
|
|
|
|
static inline bool bpf_map_flags_access_ok(u32 access_flags)
|
|
{
|
|
return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
|
|
(BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
|
|
}
|
|
|
|
struct bpf_event_entry {
|
|
struct perf_event *event;
|
|
struct file *perf_file;
|
|
struct file *map_file;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
|
|
int bpf_prog_calc_tag(struct bpf_prog *fp);
|
|
const char *kernel_type_name(u32 btf_type_id);
|
|
|
|
const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
|
|
|
|
typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
|
|
unsigned long off, unsigned long len);
|
|
typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
|
|
const struct bpf_insn *src,
|
|
struct bpf_insn *dst,
|
|
struct bpf_prog *prog,
|
|
u32 *target_size);
|
|
|
|
u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
|
|
void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
|
|
|
|
/* an array of programs to be executed under rcu_lock.
|
|
*
|
|
* Typical usage:
|
|
* ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
|
|
*
|
|
* the structure returned by bpf_prog_array_alloc() should be populated
|
|
* with program pointers and the last pointer must be NULL.
|
|
* The user has to keep refcnt on the program and make sure the program
|
|
* is removed from the array before bpf_prog_put().
|
|
* The 'struct bpf_prog_array *' should only be replaced with xchg()
|
|
* since other cpus are walking the array of pointers in parallel.
|
|
*/
|
|
struct bpf_prog_array_item {
|
|
struct bpf_prog *prog;
|
|
struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
|
|
};
|
|
|
|
struct bpf_prog_array {
|
|
struct rcu_head rcu;
|
|
struct bpf_prog_array_item items[];
|
|
};
|
|
|
|
struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
|
|
void bpf_prog_array_free(struct bpf_prog_array *progs);
|
|
int bpf_prog_array_length(struct bpf_prog_array *progs);
|
|
bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
|
|
int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
|
|
__u32 __user *prog_ids, u32 cnt);
|
|
|
|
void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
|
|
struct bpf_prog *old_prog);
|
|
int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
|
|
int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
|
|
struct bpf_prog *prog);
|
|
int bpf_prog_array_copy_info(struct bpf_prog_array *array,
|
|
u32 *prog_ids, u32 request_cnt,
|
|
u32 *prog_cnt);
|
|
int bpf_prog_array_copy(struct bpf_prog_array *old_array,
|
|
struct bpf_prog *exclude_prog,
|
|
struct bpf_prog *include_prog,
|
|
struct bpf_prog_array **new_array);
|
|
|
|
#define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \
|
|
({ \
|
|
struct bpf_prog_array_item *_item; \
|
|
struct bpf_prog *_prog; \
|
|
struct bpf_prog_array *_array; \
|
|
u32 _ret = 1; \
|
|
migrate_disable(); \
|
|
rcu_read_lock(); \
|
|
_array = rcu_dereference(array); \
|
|
if (unlikely(check_non_null && !_array))\
|
|
goto _out; \
|
|
_item = &_array->items[0]; \
|
|
while ((_prog = READ_ONCE(_item->prog))) { \
|
|
bpf_cgroup_storage_set(_item->cgroup_storage); \
|
|
_ret &= func(_prog, ctx); \
|
|
_item++; \
|
|
} \
|
|
_out: \
|
|
rcu_read_unlock(); \
|
|
migrate_enable(); \
|
|
_ret; \
|
|
})
|
|
|
|
/* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
|
|
* so BPF programs can request cwr for TCP packets.
|
|
*
|
|
* Current cgroup skb programs can only return 0 or 1 (0 to drop the
|
|
* packet. This macro changes the behavior so the low order bit
|
|
* indicates whether the packet should be dropped (0) or not (1)
|
|
* and the next bit is a congestion notification bit. This could be
|
|
* used by TCP to call tcp_enter_cwr()
|
|
*
|
|
* Hence, new allowed return values of CGROUP EGRESS BPF programs are:
|
|
* 0: drop packet
|
|
* 1: keep packet
|
|
* 2: drop packet and cn
|
|
* 3: keep packet and cn
|
|
*
|
|
* This macro then converts it to one of the NET_XMIT or an error
|
|
* code that is then interpreted as drop packet (and no cn):
|
|
* 0: NET_XMIT_SUCCESS skb should be transmitted
|
|
* 1: NET_XMIT_DROP skb should be dropped and cn
|
|
* 2: NET_XMIT_CN skb should be transmitted and cn
|
|
* 3: -EPERM skb should be dropped
|
|
*/
|
|
#define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
|
|
({ \
|
|
struct bpf_prog_array_item *_item; \
|
|
struct bpf_prog *_prog; \
|
|
struct bpf_prog_array *_array; \
|
|
u32 ret; \
|
|
u32 _ret = 1; \
|
|
u32 _cn = 0; \
|
|
migrate_disable(); \
|
|
rcu_read_lock(); \
|
|
_array = rcu_dereference(array); \
|
|
_item = &_array->items[0]; \
|
|
while ((_prog = READ_ONCE(_item->prog))) { \
|
|
bpf_cgroup_storage_set(_item->cgroup_storage); \
|
|
ret = func(_prog, ctx); \
|
|
_ret &= (ret & 1); \
|
|
_cn |= (ret & 2); \
|
|
_item++; \
|
|
} \
|
|
rcu_read_unlock(); \
|
|
migrate_enable(); \
|
|
if (_ret) \
|
|
_ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
|
|
else \
|
|
_ret = (_cn ? NET_XMIT_DROP : -EPERM); \
|
|
_ret; \
|
|
})
|
|
|
|
#define BPF_PROG_RUN_ARRAY(array, ctx, func) \
|
|
__BPF_PROG_RUN_ARRAY(array, ctx, func, false)
|
|
|
|
#define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
|
|
__BPF_PROG_RUN_ARRAY(array, ctx, func, true)
|
|
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
DECLARE_PER_CPU(int, bpf_prog_active);
|
|
extern struct mutex bpf_stats_enabled_mutex;
|
|
|
|
/*
|
|
* Block execution of BPF programs attached to instrumentation (perf,
|
|
* kprobes, tracepoints) to prevent deadlocks on map operations as any of
|
|
* these events can happen inside a region which holds a map bucket lock
|
|
* and can deadlock on it.
|
|
*
|
|
* Use the preemption safe inc/dec variants on RT because migrate disable
|
|
* is preemptible on RT and preemption in the middle of the RMW operation
|
|
* might lead to inconsistent state. Use the raw variants for non RT
|
|
* kernels as migrate_disable() maps to preempt_disable() so the slightly
|
|
* more expensive save operation can be avoided.
|
|
*/
|
|
static inline void bpf_disable_instrumentation(void)
|
|
{
|
|
migrate_disable();
|
|
if (IS_ENABLED(CONFIG_PREEMPT_RT))
|
|
this_cpu_inc(bpf_prog_active);
|
|
else
|
|
__this_cpu_inc(bpf_prog_active);
|
|
}
|
|
|
|
static inline void bpf_enable_instrumentation(void)
|
|
{
|
|
if (IS_ENABLED(CONFIG_PREEMPT_RT))
|
|
this_cpu_dec(bpf_prog_active);
|
|
else
|
|
__this_cpu_dec(bpf_prog_active);
|
|
migrate_enable();
|
|
}
|
|
|
|
extern const struct file_operations bpf_map_fops;
|
|
extern const struct file_operations bpf_prog_fops;
|
|
extern const struct file_operations bpf_iter_fops;
|
|
|
|
#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
|
|
extern const struct bpf_prog_ops _name ## _prog_ops; \
|
|
extern const struct bpf_verifier_ops _name ## _verifier_ops;
|
|
#define BPF_MAP_TYPE(_id, _ops) \
|
|
extern const struct bpf_map_ops _ops;
|
|
#define BPF_LINK_TYPE(_id, _name)
|
|
#include <linux/bpf_types.h>
|
|
#undef BPF_PROG_TYPE
|
|
#undef BPF_MAP_TYPE
|
|
#undef BPF_LINK_TYPE
|
|
|
|
extern const struct bpf_prog_ops bpf_offload_prog_ops;
|
|
extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
|
|
extern const struct bpf_verifier_ops xdp_analyzer_ops;
|
|
|
|
struct bpf_prog *bpf_prog_get(u32 ufd);
|
|
struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
|
|
bool attach_drv);
|
|
void bpf_prog_add(struct bpf_prog *prog, int i);
|
|
void bpf_prog_sub(struct bpf_prog *prog, int i);
|
|
void bpf_prog_inc(struct bpf_prog *prog);
|
|
struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
|
|
void bpf_prog_put(struct bpf_prog *prog);
|
|
int __bpf_prog_charge(struct user_struct *user, u32 pages);
|
|
void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
|
|
void __bpf_free_used_maps(struct bpf_prog_aux *aux,
|
|
struct bpf_map **used_maps, u32 len);
|
|
|
|
void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
|
|
void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
|
|
|
|
struct bpf_map *bpf_map_get(u32 ufd);
|
|
struct bpf_map *bpf_map_get_with_uref(u32 ufd);
|
|
struct bpf_map *__bpf_map_get(struct fd f);
|
|
void bpf_map_inc(struct bpf_map *map);
|
|
void bpf_map_inc_with_uref(struct bpf_map *map);
|
|
struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
|
|
void bpf_map_put_with_uref(struct bpf_map *map);
|
|
void bpf_map_put(struct bpf_map *map);
|
|
int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
|
|
void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
|
|
int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
|
|
void bpf_map_charge_finish(struct bpf_map_memory *mem);
|
|
void bpf_map_charge_move(struct bpf_map_memory *dst,
|
|
struct bpf_map_memory *src);
|
|
void *bpf_map_area_alloc(u64 size, int numa_node);
|
|
void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
|
|
void bpf_map_area_free(void *base);
|
|
void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
|
|
int generic_map_lookup_batch(struct bpf_map *map,
|
|
const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr);
|
|
int generic_map_update_batch(struct bpf_map *map,
|
|
const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr);
|
|
int generic_map_delete_batch(struct bpf_map *map,
|
|
const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr);
|
|
struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
|
|
struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
|
|
|
|
extern int sysctl_unprivileged_bpf_disabled;
|
|
|
|
static inline bool bpf_allow_ptr_leaks(void)
|
|
{
|
|
return perfmon_capable();
|
|
}
|
|
|
|
static inline bool bpf_allow_ptr_to_map_access(void)
|
|
{
|
|
return perfmon_capable();
|
|
}
|
|
|
|
static inline bool bpf_bypass_spec_v1(void)
|
|
{
|
|
return perfmon_capable();
|
|
}
|
|
|
|
static inline bool bpf_bypass_spec_v4(void)
|
|
{
|
|
return perfmon_capable();
|
|
}
|
|
|
|
int bpf_map_new_fd(struct bpf_map *map, int flags);
|
|
int bpf_prog_new_fd(struct bpf_prog *prog);
|
|
|
|
void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
|
|
const struct bpf_link_ops *ops, struct bpf_prog *prog);
|
|
int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
|
|
int bpf_link_settle(struct bpf_link_primer *primer);
|
|
void bpf_link_cleanup(struct bpf_link_primer *primer);
|
|
void bpf_link_inc(struct bpf_link *link);
|
|
void bpf_link_put(struct bpf_link *link);
|
|
int bpf_link_new_fd(struct bpf_link *link);
|
|
struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
|
|
struct bpf_link *bpf_link_get_from_fd(u32 ufd);
|
|
|
|
int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
|
|
int bpf_obj_get_user(const char __user *pathname, int flags);
|
|
|
|
#define BPF_ITER_FUNC_PREFIX "bpf_iter_"
|
|
#define DEFINE_BPF_ITER_FUNC(target, args...) \
|
|
extern int bpf_iter_ ## target(args); \
|
|
int __init bpf_iter_ ## target(args) { return 0; }
|
|
|
|
struct bpf_iter_aux_info {
|
|
struct bpf_map *map;
|
|
};
|
|
|
|
typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
|
|
union bpf_iter_link_info *linfo,
|
|
struct bpf_iter_aux_info *aux);
|
|
typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
|
|
typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
|
|
struct seq_file *seq);
|
|
typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
|
|
struct bpf_link_info *info);
|
|
|
|
#define BPF_ITER_CTX_ARG_MAX 2
|
|
struct bpf_iter_reg {
|
|
const char *target;
|
|
bpf_iter_attach_target_t attach_target;
|
|
bpf_iter_detach_target_t detach_target;
|
|
bpf_iter_show_fdinfo_t show_fdinfo;
|
|
bpf_iter_fill_link_info_t fill_link_info;
|
|
u32 ctx_arg_info_size;
|
|
struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
|
|
const struct bpf_iter_seq_info *seq_info;
|
|
};
|
|
|
|
struct bpf_iter_meta {
|
|
__bpf_md_ptr(struct seq_file *, seq);
|
|
u64 session_id;
|
|
u64 seq_num;
|
|
};
|
|
|
|
struct bpf_iter__bpf_map_elem {
|
|
__bpf_md_ptr(struct bpf_iter_meta *, meta);
|
|
__bpf_md_ptr(struct bpf_map *, map);
|
|
__bpf_md_ptr(void *, key);
|
|
__bpf_md_ptr(void *, value);
|
|
};
|
|
|
|
int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
|
|
void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
|
|
bool bpf_iter_prog_supported(struct bpf_prog *prog);
|
|
int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
|
|
int bpf_iter_new_fd(struct bpf_link *link);
|
|
bool bpf_link_is_iter(struct bpf_link *link);
|
|
struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
|
|
int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
|
|
void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
|
|
struct seq_file *seq);
|
|
int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
|
|
struct bpf_link_info *info);
|
|
|
|
int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
|
|
int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
|
|
int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
|
|
u64 flags);
|
|
int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
|
|
u64 flags);
|
|
|
|
int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
|
|
|
|
int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
|
|
void *key, void *value, u64 map_flags);
|
|
int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
|
|
int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
|
|
void *key, void *value, u64 map_flags);
|
|
int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
|
|
|
|
int bpf_get_file_flag(int flags);
|
|
int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
|
|
size_t actual_size);
|
|
|
|
/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
|
|
* forced to use 'long' read/writes to try to atomically copy long counters.
|
|
* Best-effort only. No barriers here, since it _will_ race with concurrent
|
|
* updates from BPF programs. Called from bpf syscall and mostly used with
|
|
* size 8 or 16 bytes, so ask compiler to inline it.
|
|
*/
|
|
static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
|
|
{
|
|
const long *lsrc = src;
|
|
long *ldst = dst;
|
|
|
|
size /= sizeof(long);
|
|
while (size--)
|
|
*ldst++ = *lsrc++;
|
|
}
|
|
|
|
/* verify correctness of eBPF program */
|
|
int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
|
|
union bpf_attr __user *uattr);
|
|
void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
|
|
|
|
/* Map specifics */
|
|
struct xdp_buff;
|
|
struct sk_buff;
|
|
|
|
struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
|
|
struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
|
|
void __dev_flush(void);
|
|
int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
|
|
struct net_device *dev_rx);
|
|
int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
|
|
struct net_device *dev_rx);
|
|
int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
|
|
struct bpf_prog *xdp_prog);
|
|
bool dev_map_can_have_prog(struct bpf_map *map);
|
|
|
|
struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
|
|
void __cpu_map_flush(void);
|
|
int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
|
|
struct net_device *dev_rx);
|
|
bool cpu_map_prog_allowed(struct bpf_map *map);
|
|
|
|
/* Return map's numa specified by userspace */
|
|
static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
|
|
{
|
|
return (attr->map_flags & BPF_F_NUMA_NODE) ?
|
|
attr->numa_node : NUMA_NO_NODE;
|
|
}
|
|
|
|
struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
|
|
int array_map_alloc_check(union bpf_attr *attr);
|
|
|
|
int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr);
|
|
int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr);
|
|
int bpf_prog_test_run_tracing(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr);
|
|
int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr);
|
|
bool btf_ctx_access(int off, int size, enum bpf_access_type type,
|
|
const struct bpf_prog *prog,
|
|
struct bpf_insn_access_aux *info);
|
|
int btf_struct_access(struct bpf_verifier_log *log,
|
|
const struct btf_type *t, int off, int size,
|
|
enum bpf_access_type atype,
|
|
u32 *next_btf_id);
|
|
bool btf_struct_ids_match(struct bpf_verifier_log *log,
|
|
int off, u32 id, u32 need_type_id);
|
|
int btf_resolve_helper_id(struct bpf_verifier_log *log,
|
|
const struct bpf_func_proto *fn, int);
|
|
|
|
int btf_distill_func_proto(struct bpf_verifier_log *log,
|
|
struct btf *btf,
|
|
const struct btf_type *func_proto,
|
|
const char *func_name,
|
|
struct btf_func_model *m);
|
|
|
|
struct bpf_reg_state;
|
|
int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
|
|
struct bpf_reg_state *regs);
|
|
int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
|
|
struct bpf_reg_state *reg);
|
|
int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
|
|
struct btf *btf, const struct btf_type *t);
|
|
|
|
struct bpf_prog *bpf_prog_by_id(u32 id);
|
|
struct bpf_link *bpf_link_by_id(u32 id);
|
|
|
|
const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
|
|
#else /* !CONFIG_BPF_SYSCALL */
|
|
static inline struct bpf_prog *bpf_prog_get(u32 ufd)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
|
|
enum bpf_prog_type type,
|
|
bool attach_drv)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static inline void bpf_prog_add(struct bpf_prog *prog, int i)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_prog_put(struct bpf_prog *prog)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_prog_inc(struct bpf_prog *prog)
|
|
{
|
|
}
|
|
|
|
static inline struct bpf_prog *__must_check
|
|
bpf_prog_inc_not_zero(struct bpf_prog *prog)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
|
|
const struct bpf_link_ops *ops,
|
|
struct bpf_prog *prog)
|
|
{
|
|
}
|
|
|
|
static inline int bpf_link_prime(struct bpf_link *link,
|
|
struct bpf_link_primer *primer)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int bpf_link_settle(struct bpf_link_primer *primer)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_link_inc(struct bpf_link *link)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_link_put(struct bpf_link *link)
|
|
{
|
|
}
|
|
|
|
static inline int bpf_obj_get_user(const char __user *pathname, int flags)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map,
|
|
u32 key)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map,
|
|
u32 key)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline bool dev_map_can_have_prog(struct bpf_map *map)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void __dev_flush(void)
|
|
{
|
|
}
|
|
|
|
struct xdp_buff;
|
|
struct bpf_dtab_netdev;
|
|
|
|
static inline
|
|
int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
|
|
struct net_device *dev_rx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
|
|
struct net_device *dev_rx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct sk_buff;
|
|
|
|
static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
|
|
struct sk_buff *skb,
|
|
struct bpf_prog *xdp_prog)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void __cpu_map_flush(void)
|
|
{
|
|
}
|
|
|
|
static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
|
|
struct xdp_buff *xdp,
|
|
struct net_device *dev_rx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool cpu_map_prog_allowed(struct bpf_map *map)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
|
|
enum bpf_prog_type type)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
|
|
const union bpf_attr *kattr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline void bpf_map_put(struct bpf_map *map)
|
|
{
|
|
}
|
|
|
|
static inline struct bpf_prog *bpf_prog_by_id(u32 id)
|
|
{
|
|
return ERR_PTR(-ENOTSUPP);
|
|
}
|
|
|
|
static inline const struct bpf_func_proto *
|
|
bpf_base_func_proto(enum bpf_func_id func_id)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_BPF_SYSCALL */
|
|
|
|
static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
|
|
enum bpf_prog_type type)
|
|
{
|
|
return bpf_prog_get_type_dev(ufd, type, false);
|
|
}
|
|
|
|
bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
|
|
|
|
int bpf_prog_offload_compile(struct bpf_prog *prog);
|
|
void bpf_prog_offload_destroy(struct bpf_prog *prog);
|
|
int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
|
|
struct bpf_prog *prog);
|
|
|
|
int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
|
|
|
|
int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
|
|
int bpf_map_offload_update_elem(struct bpf_map *map,
|
|
void *key, void *value, u64 flags);
|
|
int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
|
|
int bpf_map_offload_get_next_key(struct bpf_map *map,
|
|
void *key, void *next_key);
|
|
|
|
bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
|
|
|
|
struct bpf_offload_dev *
|
|
bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
|
|
void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
|
|
void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
|
|
int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
|
|
struct net_device *netdev);
|
|
void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
|
|
struct net_device *netdev);
|
|
bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
|
|
|
|
#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
|
|
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
|
|
|
|
static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
|
|
{
|
|
return aux->offload_requested;
|
|
}
|
|
|
|
static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
|
|
{
|
|
return unlikely(map->ops == &bpf_map_offload_ops);
|
|
}
|
|
|
|
struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
|
|
void bpf_map_offload_map_free(struct bpf_map *map);
|
|
#else
|
|
static inline int bpf_prog_offload_init(struct bpf_prog *prog,
|
|
union bpf_attr *attr)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static inline void bpf_map_offload_map_free(struct bpf_map *map)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
|
|
|
|
#if defined(CONFIG_BPF_STREAM_PARSER)
|
|
int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog,
|
|
struct bpf_prog *old, u32 which);
|
|
int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
|
|
int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
|
|
int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
|
|
void sock_map_unhash(struct sock *sk);
|
|
void sock_map_close(struct sock *sk, long timeout);
|
|
#else
|
|
static inline int sock_map_prog_update(struct bpf_map *map,
|
|
struct bpf_prog *prog,
|
|
struct bpf_prog *old, u32 which)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int sock_map_get_from_fd(const union bpf_attr *attr,
|
|
struct bpf_prog *prog)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int sock_map_prog_detach(const union bpf_attr *attr,
|
|
enum bpf_prog_type ptype)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
|
|
u64 flags)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif /* CONFIG_BPF_STREAM_PARSER */
|
|
|
|
#if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
|
|
void bpf_sk_reuseport_detach(struct sock *sk);
|
|
int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
|
|
void *value);
|
|
int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
|
|
void *value, u64 map_flags);
|
|
#else
|
|
static inline void bpf_sk_reuseport_detach(struct sock *sk)
|
|
{
|
|
}
|
|
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
|
|
void *key, void *value)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
|
|
void *key, void *value,
|
|
u64 map_flags)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif /* CONFIG_BPF_SYSCALL */
|
|
#endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
|
|
|
|
/* verifier prototypes for helper functions called from eBPF programs */
|
|
extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
|
|
extern const struct bpf_func_proto bpf_map_update_elem_proto;
|
|
extern const struct bpf_func_proto bpf_map_delete_elem_proto;
|
|
extern const struct bpf_func_proto bpf_map_push_elem_proto;
|
|
extern const struct bpf_func_proto bpf_map_pop_elem_proto;
|
|
extern const struct bpf_func_proto bpf_map_peek_elem_proto;
|
|
|
|
extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
|
|
extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
|
|
extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
|
|
extern const struct bpf_func_proto bpf_tail_call_proto;
|
|
extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
|
|
extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
|
|
extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
|
|
extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
|
|
extern const struct bpf_func_proto bpf_get_current_comm_proto;
|
|
extern const struct bpf_func_proto bpf_get_stackid_proto;
|
|
extern const struct bpf_func_proto bpf_get_stack_proto;
|
|
extern const struct bpf_func_proto bpf_get_task_stack_proto;
|
|
extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
|
|
extern const struct bpf_func_proto bpf_get_stack_proto_pe;
|
|
extern const struct bpf_func_proto bpf_sock_map_update_proto;
|
|
extern const struct bpf_func_proto bpf_sock_hash_update_proto;
|
|
extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
|
|
extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
|
|
extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
|
|
extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
|
|
extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
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extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
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extern const struct bpf_func_proto bpf_spin_lock_proto;
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extern const struct bpf_func_proto bpf_spin_unlock_proto;
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extern const struct bpf_func_proto bpf_get_local_storage_proto;
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extern const struct bpf_func_proto bpf_strtol_proto;
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extern const struct bpf_func_proto bpf_strtoul_proto;
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extern const struct bpf_func_proto bpf_tcp_sock_proto;
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extern const struct bpf_func_proto bpf_jiffies64_proto;
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extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
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extern const struct bpf_func_proto bpf_event_output_data_proto;
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extern const struct bpf_func_proto bpf_ringbuf_output_proto;
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extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
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extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
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extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
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extern const struct bpf_func_proto bpf_ringbuf_query_proto;
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extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
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extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
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extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
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extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
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extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
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extern const struct bpf_func_proto bpf_copy_from_user_proto;
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const struct bpf_func_proto *bpf_tracing_func_proto(
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enum bpf_func_id func_id, const struct bpf_prog *prog);
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const struct bpf_func_proto *tracing_prog_func_proto(
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enum bpf_func_id func_id, const struct bpf_prog *prog);
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/* Shared helpers among cBPF and eBPF. */
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void bpf_user_rnd_init_once(void);
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u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
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u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
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#if defined(CONFIG_NET)
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bool bpf_sock_common_is_valid_access(int off, int size,
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enum bpf_access_type type,
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struct bpf_insn_access_aux *info);
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bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
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struct bpf_insn_access_aux *info);
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u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
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const struct bpf_insn *si,
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struct bpf_insn *insn_buf,
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struct bpf_prog *prog,
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u32 *target_size);
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#else
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static inline bool bpf_sock_common_is_valid_access(int off, int size,
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enum bpf_access_type type,
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struct bpf_insn_access_aux *info)
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{
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return false;
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}
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static inline bool bpf_sock_is_valid_access(int off, int size,
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enum bpf_access_type type,
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struct bpf_insn_access_aux *info)
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{
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return false;
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}
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static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
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const struct bpf_insn *si,
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struct bpf_insn *insn_buf,
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struct bpf_prog *prog,
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u32 *target_size)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_INET
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struct sk_reuseport_kern {
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struct sk_buff *skb;
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struct sock *sk;
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struct sock *selected_sk;
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void *data_end;
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u32 hash;
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u32 reuseport_id;
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bool bind_inany;
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};
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bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
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struct bpf_insn_access_aux *info);
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u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
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const struct bpf_insn *si,
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struct bpf_insn *insn_buf,
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struct bpf_prog *prog,
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u32 *target_size);
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bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
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struct bpf_insn_access_aux *info);
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u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
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const struct bpf_insn *si,
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struct bpf_insn *insn_buf,
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struct bpf_prog *prog,
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u32 *target_size);
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#else
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static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
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enum bpf_access_type type,
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struct bpf_insn_access_aux *info)
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{
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return false;
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}
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static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
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const struct bpf_insn *si,
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struct bpf_insn *insn_buf,
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struct bpf_prog *prog,
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u32 *target_size)
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{
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return 0;
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}
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static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
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enum bpf_access_type type,
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struct bpf_insn_access_aux *info)
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{
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return false;
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}
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static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
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const struct bpf_insn *si,
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|
struct bpf_insn *insn_buf,
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|
struct bpf_prog *prog,
|
|
u32 *target_size)
|
|
{
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return 0;
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}
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#endif /* CONFIG_INET */
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enum bpf_text_poke_type {
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BPF_MOD_CALL,
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BPF_MOD_JUMP,
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};
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int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
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void *addr1, void *addr2);
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struct btf_id_set;
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bool btf_id_set_contains(struct btf_id_set *set, u32 id);
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#endif /* _LINUX_BPF_H */
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