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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Jakub Kicinski](/assets/img/avatar_default.png)
The fact that we don't know which device the program is going to be used on is quite limiting in current eBPF infrastructure. We have to reverse or limit the changes which kernel makes to the loaded bytecode if we want it to be offloaded to a networking device. We also have to invent new APIs for debugging and troubleshooting support. Make it possible to load programs for a specific netdev. This helps us to bring the debug information closer to the core eBPF infrastructure (e.g. we will be able to reuse the verifer log in device JIT). It allows device JITs to perform translation on the original bytecode. __bpf_prog_get() when called to get a reference for an attachment point will now refuse to give it if program has a device assigned. Following patches will add a version of that function which passes the expected netdev in. @type argument in __bpf_prog_get() is renamed to attach_type to make it clearer that it's only set on attachment. All calls to ndo_bpf are protected by rtnl, only verifier callbacks are not. We need a wait queue to make sure netdev doesn't get destroyed while verifier is still running and calling its driver. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1744 lines
38 KiB
C
1744 lines
38 KiB
C
/* 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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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/bpf.h>
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#include <linux/bpf_trace.h>
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#include <linux/syscalls.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/vmalloc.h>
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#include <linux/mmzone.h>
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#include <linux/anon_inodes.h>
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#include <linux/file.h>
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#include <linux/license.h>
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#include <linux/filter.h>
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/idr.h>
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#include <linux/cred.h>
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#include <linux/timekeeping.h>
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#include <linux/ctype.h>
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#define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \
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(map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
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(map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
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(map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
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#define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
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#define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map))
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#define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
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DEFINE_PER_CPU(int, bpf_prog_active);
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static DEFINE_IDR(prog_idr);
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static DEFINE_SPINLOCK(prog_idr_lock);
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static DEFINE_IDR(map_idr);
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static DEFINE_SPINLOCK(map_idr_lock);
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int sysctl_unprivileged_bpf_disabled __read_mostly;
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static const struct bpf_map_ops * const bpf_map_types[] = {
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#define BPF_PROG_TYPE(_id, _ops)
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#define BPF_MAP_TYPE(_id, _ops) \
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[_id] = &_ops,
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#include <linux/bpf_types.h>
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#undef BPF_PROG_TYPE
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#undef BPF_MAP_TYPE
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};
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/*
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* If we're handed a bigger struct than we know of, ensure all the unknown bits
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* are 0 - i.e. new user-space does not rely on any kernel feature extensions
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* we don't know about yet.
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*
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* There is a ToCToU between this function call and the following
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* copy_from_user() call. However, this is not a concern since this function is
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* meant to be a future-proofing of bits.
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*/
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static int check_uarg_tail_zero(void __user *uaddr,
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size_t expected_size,
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size_t actual_size)
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{
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unsigned char __user *addr;
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unsigned char __user *end;
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unsigned char val;
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int err;
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if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
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return -E2BIG;
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if (unlikely(!access_ok(VERIFY_READ, uaddr, actual_size)))
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return -EFAULT;
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if (actual_size <= expected_size)
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return 0;
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addr = uaddr + expected_size;
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end = uaddr + actual_size;
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for (; addr < end; addr++) {
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err = get_user(val, addr);
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if (err)
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return err;
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if (val)
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return -E2BIG;
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}
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return 0;
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}
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static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
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{
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struct bpf_map *map;
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if (attr->map_type >= ARRAY_SIZE(bpf_map_types) ||
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!bpf_map_types[attr->map_type])
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return ERR_PTR(-EINVAL);
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map = bpf_map_types[attr->map_type]->map_alloc(attr);
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if (IS_ERR(map))
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return map;
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map->ops = bpf_map_types[attr->map_type];
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map->map_type = attr->map_type;
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return map;
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}
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void *bpf_map_area_alloc(size_t size, int numa_node)
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{
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/* We definitely need __GFP_NORETRY, so OOM killer doesn't
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* trigger under memory pressure as we really just want to
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* fail instead.
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*/
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const gfp_t flags = __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO;
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void *area;
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if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
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area = kmalloc_node(size, GFP_USER | flags, numa_node);
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if (area != NULL)
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return area;
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}
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return __vmalloc_node_flags_caller(size, numa_node, GFP_KERNEL | flags,
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__builtin_return_address(0));
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}
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void bpf_map_area_free(void *area)
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{
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kvfree(area);
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}
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int bpf_map_precharge_memlock(u32 pages)
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{
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struct user_struct *user = get_current_user();
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unsigned long memlock_limit, cur;
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memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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cur = atomic_long_read(&user->locked_vm);
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free_uid(user);
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if (cur + pages > memlock_limit)
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return -EPERM;
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return 0;
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}
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static int bpf_map_charge_memlock(struct bpf_map *map)
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{
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struct user_struct *user = get_current_user();
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unsigned long memlock_limit;
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memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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atomic_long_add(map->pages, &user->locked_vm);
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if (atomic_long_read(&user->locked_vm) > memlock_limit) {
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atomic_long_sub(map->pages, &user->locked_vm);
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free_uid(user);
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return -EPERM;
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}
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map->user = user;
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return 0;
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}
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static void bpf_map_uncharge_memlock(struct bpf_map *map)
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{
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struct user_struct *user = map->user;
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atomic_long_sub(map->pages, &user->locked_vm);
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free_uid(user);
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}
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static int bpf_map_alloc_id(struct bpf_map *map)
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{
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int id;
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spin_lock_bh(&map_idr_lock);
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id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
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if (id > 0)
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map->id = id;
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spin_unlock_bh(&map_idr_lock);
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if (WARN_ON_ONCE(!id))
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return -ENOSPC;
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return id > 0 ? 0 : id;
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}
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static void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
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{
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unsigned long flags;
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if (do_idr_lock)
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spin_lock_irqsave(&map_idr_lock, flags);
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else
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__acquire(&map_idr_lock);
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idr_remove(&map_idr, map->id);
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if (do_idr_lock)
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spin_unlock_irqrestore(&map_idr_lock, flags);
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else
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__release(&map_idr_lock);
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}
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/* called from workqueue */
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static void bpf_map_free_deferred(struct work_struct *work)
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{
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struct bpf_map *map = container_of(work, struct bpf_map, work);
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bpf_map_uncharge_memlock(map);
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security_bpf_map_free(map);
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/* implementation dependent freeing */
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map->ops->map_free(map);
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}
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static void bpf_map_put_uref(struct bpf_map *map)
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{
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if (atomic_dec_and_test(&map->usercnt)) {
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if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY)
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bpf_fd_array_map_clear(map);
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}
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}
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/* decrement map refcnt and schedule it for freeing via workqueue
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* (unrelying map implementation ops->map_free() might sleep)
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*/
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static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
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{
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if (atomic_dec_and_test(&map->refcnt)) {
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/* bpf_map_free_id() must be called first */
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bpf_map_free_id(map, do_idr_lock);
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INIT_WORK(&map->work, bpf_map_free_deferred);
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schedule_work(&map->work);
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}
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}
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void bpf_map_put(struct bpf_map *map)
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{
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__bpf_map_put(map, true);
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}
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void bpf_map_put_with_uref(struct bpf_map *map)
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{
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bpf_map_put_uref(map);
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bpf_map_put(map);
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}
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static int bpf_map_release(struct inode *inode, struct file *filp)
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{
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struct bpf_map *map = filp->private_data;
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if (map->ops->map_release)
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map->ops->map_release(map, filp);
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bpf_map_put_with_uref(map);
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return 0;
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}
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#ifdef CONFIG_PROC_FS
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static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
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{
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const struct bpf_map *map = filp->private_data;
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const struct bpf_array *array;
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u32 owner_prog_type = 0;
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u32 owner_jited = 0;
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if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
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array = container_of(map, struct bpf_array, map);
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owner_prog_type = array->owner_prog_type;
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owner_jited = array->owner_jited;
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}
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seq_printf(m,
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"map_type:\t%u\n"
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"key_size:\t%u\n"
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"value_size:\t%u\n"
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"max_entries:\t%u\n"
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"map_flags:\t%#x\n"
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"memlock:\t%llu\n",
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map->map_type,
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map->key_size,
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map->value_size,
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map->max_entries,
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map->map_flags,
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map->pages * 1ULL << PAGE_SHIFT);
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if (owner_prog_type) {
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seq_printf(m, "owner_prog_type:\t%u\n",
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owner_prog_type);
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seq_printf(m, "owner_jited:\t%u\n",
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owner_jited);
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}
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}
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#endif
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static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
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loff_t *ppos)
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{
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/* We need this handler such that alloc_file() enables
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* f_mode with FMODE_CAN_READ.
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*/
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return -EINVAL;
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}
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static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
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size_t siz, loff_t *ppos)
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{
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/* We need this handler such that alloc_file() enables
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* f_mode with FMODE_CAN_WRITE.
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*/
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return -EINVAL;
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}
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const struct file_operations bpf_map_fops = {
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#ifdef CONFIG_PROC_FS
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.show_fdinfo = bpf_map_show_fdinfo,
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#endif
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.release = bpf_map_release,
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.read = bpf_dummy_read,
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.write = bpf_dummy_write,
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};
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int bpf_map_new_fd(struct bpf_map *map, int flags)
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{
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int ret;
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ret = security_bpf_map(map, OPEN_FMODE(flags));
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if (ret < 0)
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return ret;
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return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
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flags | O_CLOEXEC);
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}
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int bpf_get_file_flag(int flags)
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{
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if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
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return -EINVAL;
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if (flags & BPF_F_RDONLY)
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return O_RDONLY;
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if (flags & BPF_F_WRONLY)
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return O_WRONLY;
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return O_RDWR;
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}
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/* helper macro to check that unused fields 'union bpf_attr' are zero */
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#define CHECK_ATTR(CMD) \
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memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
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sizeof(attr->CMD##_LAST_FIELD), 0, \
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sizeof(*attr) - \
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offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
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sizeof(attr->CMD##_LAST_FIELD)) != NULL
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/* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes.
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* Return 0 on success and < 0 on error.
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*/
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static int bpf_obj_name_cpy(char *dst, const char *src)
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{
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const char *end = src + BPF_OBJ_NAME_LEN;
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memset(dst, 0, BPF_OBJ_NAME_LEN);
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/* Copy all isalnum() and '_' char */
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while (src < end && *src) {
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if (!isalnum(*src) && *src != '_')
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return -EINVAL;
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*dst++ = *src++;
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}
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/* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */
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if (src == end)
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return -EINVAL;
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return 0;
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}
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#define BPF_MAP_CREATE_LAST_FIELD map_name
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/* called via syscall */
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static int map_create(union bpf_attr *attr)
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{
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int numa_node = bpf_map_attr_numa_node(attr);
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struct bpf_map *map;
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int f_flags;
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int err;
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err = CHECK_ATTR(BPF_MAP_CREATE);
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if (err)
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return -EINVAL;
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f_flags = bpf_get_file_flag(attr->map_flags);
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if (f_flags < 0)
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return f_flags;
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if (numa_node != NUMA_NO_NODE &&
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((unsigned int)numa_node >= nr_node_ids ||
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!node_online(numa_node)))
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return -EINVAL;
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/* find map type and init map: hashtable vs rbtree vs bloom vs ... */
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map = find_and_alloc_map(attr);
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if (IS_ERR(map))
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return PTR_ERR(map);
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err = bpf_obj_name_cpy(map->name, attr->map_name);
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if (err)
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goto free_map_nouncharge;
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atomic_set(&map->refcnt, 1);
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atomic_set(&map->usercnt, 1);
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err = security_bpf_map_alloc(map);
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if (err)
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goto free_map_nouncharge;
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err = bpf_map_charge_memlock(map);
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if (err)
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goto free_map_sec;
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err = bpf_map_alloc_id(map);
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if (err)
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goto free_map;
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err = bpf_map_new_fd(map, f_flags);
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if (err < 0) {
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/* failed to allocate fd.
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* bpf_map_put() is needed because the above
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* bpf_map_alloc_id() has published the map
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* to the userspace and the userspace may
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* have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
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*/
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bpf_map_put(map);
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return err;
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}
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|
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trace_bpf_map_create(map, err);
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return err;
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|
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free_map:
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bpf_map_uncharge_memlock(map);
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free_map_sec:
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security_bpf_map_free(map);
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free_map_nouncharge:
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map->ops->map_free(map);
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return err;
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}
|
|
|
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/* if error is returned, fd is released.
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* On success caller should complete fd access with matching fdput()
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*/
|
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struct bpf_map *__bpf_map_get(struct fd f)
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{
|
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if (!f.file)
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return ERR_PTR(-EBADF);
|
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if (f.file->f_op != &bpf_map_fops) {
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fdput(f);
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return ERR_PTR(-EINVAL);
|
|
}
|
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|
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return f.file->private_data;
|
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}
|
|
|
|
/* prog's and map's refcnt limit */
|
|
#define BPF_MAX_REFCNT 32768
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|
|
|
struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref)
|
|
{
|
|
if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) {
|
|
atomic_dec(&map->refcnt);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
if (uref)
|
|
atomic_inc(&map->usercnt);
|
|
return map;
|
|
}
|
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|
|
struct bpf_map *bpf_map_get_with_uref(u32 ufd)
|
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{
|
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struct fd f = fdget(ufd);
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struct bpf_map *map;
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|
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map = __bpf_map_get(f);
|
|
if (IS_ERR(map))
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return map;
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|
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map = bpf_map_inc(map, true);
|
|
fdput(f);
|
|
|
|
return map;
|
|
}
|
|
|
|
/* map_idr_lock should have been held */
|
|
static struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map,
|
|
bool uref)
|
|
{
|
|
int refold;
|
|
|
|
refold = __atomic_add_unless(&map->refcnt, 1, 0);
|
|
|
|
if (refold >= BPF_MAX_REFCNT) {
|
|
__bpf_map_put(map, false);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
|
|
if (!refold)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
if (uref)
|
|
atomic_inc(&map->usercnt);
|
|
|
|
return map;
|
|
}
|
|
|
|
int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
/* last field in 'union bpf_attr' used by this command */
|
|
#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value
|
|
|
|
static int map_lookup_elem(union bpf_attr *attr)
|
|
{
|
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
|
void __user *uvalue = u64_to_user_ptr(attr->value);
|
|
int ufd = attr->map_fd;
|
|
struct bpf_map *map;
|
|
void *key, *value, *ptr;
|
|
u32 value_size;
|
|
struct fd f;
|
|
int err;
|
|
|
|
if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
|
|
return -EINVAL;
|
|
|
|
f = fdget(ufd);
|
|
map = __bpf_map_get(f);
|
|
if (IS_ERR(map))
|
|
return PTR_ERR(map);
|
|
|
|
if (!(f.file->f_mode & FMODE_CAN_READ)) {
|
|
err = -EPERM;
|
|
goto err_put;
|
|
}
|
|
|
|
key = memdup_user(ukey, map->key_size);
|
|
if (IS_ERR(key)) {
|
|
err = PTR_ERR(key);
|
|
goto err_put;
|
|
}
|
|
|
|
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
|
|
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
|
|
map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY)
|
|
value_size = round_up(map->value_size, 8) * num_possible_cpus();
|
|
else if (IS_FD_MAP(map))
|
|
value_size = sizeof(u32);
|
|
else
|
|
value_size = map->value_size;
|
|
|
|
err = -ENOMEM;
|
|
value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
|
|
if (!value)
|
|
goto free_key;
|
|
|
|
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
|
|
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
|
|
err = bpf_percpu_hash_copy(map, key, value);
|
|
} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
|
|
err = bpf_percpu_array_copy(map, key, value);
|
|
} else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
|
|
err = bpf_stackmap_copy(map, key, value);
|
|
} else if (IS_FD_ARRAY(map)) {
|
|
err = bpf_fd_array_map_lookup_elem(map, key, value);
|
|
} else if (IS_FD_HASH(map)) {
|
|
err = bpf_fd_htab_map_lookup_elem(map, key, value);
|
|
} else {
|
|
rcu_read_lock();
|
|
ptr = map->ops->map_lookup_elem(map, key);
|
|
if (ptr)
|
|
memcpy(value, ptr, value_size);
|
|
rcu_read_unlock();
|
|
err = ptr ? 0 : -ENOENT;
|
|
}
|
|
|
|
if (err)
|
|
goto free_value;
|
|
|
|
err = -EFAULT;
|
|
if (copy_to_user(uvalue, value, value_size) != 0)
|
|
goto free_value;
|
|
|
|
trace_bpf_map_lookup_elem(map, ufd, key, value);
|
|
err = 0;
|
|
|
|
free_value:
|
|
kfree(value);
|
|
free_key:
|
|
kfree(key);
|
|
err_put:
|
|
fdput(f);
|
|
return err;
|
|
}
|
|
|
|
#define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
|
|
|
|
static int map_update_elem(union bpf_attr *attr)
|
|
{
|
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
|
void __user *uvalue = u64_to_user_ptr(attr->value);
|
|
int ufd = attr->map_fd;
|
|
struct bpf_map *map;
|
|
void *key, *value;
|
|
u32 value_size;
|
|
struct fd f;
|
|
int err;
|
|
|
|
if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
|
|
return -EINVAL;
|
|
|
|
f = fdget(ufd);
|
|
map = __bpf_map_get(f);
|
|
if (IS_ERR(map))
|
|
return PTR_ERR(map);
|
|
|
|
if (!(f.file->f_mode & FMODE_CAN_WRITE)) {
|
|
err = -EPERM;
|
|
goto err_put;
|
|
}
|
|
|
|
key = memdup_user(ukey, map->key_size);
|
|
if (IS_ERR(key)) {
|
|
err = PTR_ERR(key);
|
|
goto err_put;
|
|
}
|
|
|
|
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
|
|
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
|
|
map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY)
|
|
value_size = round_up(map->value_size, 8) * num_possible_cpus();
|
|
else
|
|
value_size = map->value_size;
|
|
|
|
err = -ENOMEM;
|
|
value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
|
|
if (!value)
|
|
goto free_key;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(value, uvalue, value_size) != 0)
|
|
goto free_value;
|
|
|
|
/* Need to create a kthread, thus must support schedule */
|
|
if (map->map_type == BPF_MAP_TYPE_CPUMAP) {
|
|
err = map->ops->map_update_elem(map, key, value, attr->flags);
|
|
goto out;
|
|
}
|
|
|
|
/* must increment bpf_prog_active to avoid kprobe+bpf triggering from
|
|
* inside bpf map update or delete otherwise deadlocks are possible
|
|
*/
|
|
preempt_disable();
|
|
__this_cpu_inc(bpf_prog_active);
|
|
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
|
|
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
|
|
err = bpf_percpu_hash_update(map, key, value, attr->flags);
|
|
} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
|
|
err = bpf_percpu_array_update(map, key, value, attr->flags);
|
|
} else if (map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY ||
|
|
map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
|
|
map->map_type == BPF_MAP_TYPE_CGROUP_ARRAY ||
|
|
map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) {
|
|
rcu_read_lock();
|
|
err = bpf_fd_array_map_update_elem(map, f.file, key, value,
|
|
attr->flags);
|
|
rcu_read_unlock();
|
|
} else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
|
|
rcu_read_lock();
|
|
err = bpf_fd_htab_map_update_elem(map, f.file, key, value,
|
|
attr->flags);
|
|
rcu_read_unlock();
|
|
} else {
|
|
rcu_read_lock();
|
|
err = map->ops->map_update_elem(map, key, value, attr->flags);
|
|
rcu_read_unlock();
|
|
}
|
|
__this_cpu_dec(bpf_prog_active);
|
|
preempt_enable();
|
|
out:
|
|
if (!err)
|
|
trace_bpf_map_update_elem(map, ufd, key, value);
|
|
free_value:
|
|
kfree(value);
|
|
free_key:
|
|
kfree(key);
|
|
err_put:
|
|
fdput(f);
|
|
return err;
|
|
}
|
|
|
|
#define BPF_MAP_DELETE_ELEM_LAST_FIELD key
|
|
|
|
static int map_delete_elem(union bpf_attr *attr)
|
|
{
|
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
|
int ufd = attr->map_fd;
|
|
struct bpf_map *map;
|
|
struct fd f;
|
|
void *key;
|
|
int err;
|
|
|
|
if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
|
|
return -EINVAL;
|
|
|
|
f = fdget(ufd);
|
|
map = __bpf_map_get(f);
|
|
if (IS_ERR(map))
|
|
return PTR_ERR(map);
|
|
|
|
if (!(f.file->f_mode & FMODE_CAN_WRITE)) {
|
|
err = -EPERM;
|
|
goto err_put;
|
|
}
|
|
|
|
key = memdup_user(ukey, map->key_size);
|
|
if (IS_ERR(key)) {
|
|
err = PTR_ERR(key);
|
|
goto err_put;
|
|
}
|
|
|
|
preempt_disable();
|
|
__this_cpu_inc(bpf_prog_active);
|
|
rcu_read_lock();
|
|
err = map->ops->map_delete_elem(map, key);
|
|
rcu_read_unlock();
|
|
__this_cpu_dec(bpf_prog_active);
|
|
preempt_enable();
|
|
|
|
if (!err)
|
|
trace_bpf_map_delete_elem(map, ufd, key);
|
|
kfree(key);
|
|
err_put:
|
|
fdput(f);
|
|
return err;
|
|
}
|
|
|
|
/* last field in 'union bpf_attr' used by this command */
|
|
#define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
|
|
|
|
static int map_get_next_key(union bpf_attr *attr)
|
|
{
|
|
void __user *ukey = u64_to_user_ptr(attr->key);
|
|
void __user *unext_key = u64_to_user_ptr(attr->next_key);
|
|
int ufd = attr->map_fd;
|
|
struct bpf_map *map;
|
|
void *key, *next_key;
|
|
struct fd f;
|
|
int err;
|
|
|
|
if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
|
|
return -EINVAL;
|
|
|
|
f = fdget(ufd);
|
|
map = __bpf_map_get(f);
|
|
if (IS_ERR(map))
|
|
return PTR_ERR(map);
|
|
|
|
if (!(f.file->f_mode & FMODE_CAN_READ)) {
|
|
err = -EPERM;
|
|
goto err_put;
|
|
}
|
|
|
|
if (ukey) {
|
|
key = memdup_user(ukey, map->key_size);
|
|
if (IS_ERR(key)) {
|
|
err = PTR_ERR(key);
|
|
goto err_put;
|
|
}
|
|
} else {
|
|
key = NULL;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
next_key = kmalloc(map->key_size, GFP_USER);
|
|
if (!next_key)
|
|
goto free_key;
|
|
|
|
rcu_read_lock();
|
|
err = map->ops->map_get_next_key(map, key, next_key);
|
|
rcu_read_unlock();
|
|
if (err)
|
|
goto free_next_key;
|
|
|
|
err = -EFAULT;
|
|
if (copy_to_user(unext_key, next_key, map->key_size) != 0)
|
|
goto free_next_key;
|
|
|
|
trace_bpf_map_next_key(map, ufd, key, next_key);
|
|
err = 0;
|
|
|
|
free_next_key:
|
|
kfree(next_key);
|
|
free_key:
|
|
kfree(key);
|
|
err_put:
|
|
fdput(f);
|
|
return err;
|
|
}
|
|
|
|
static const struct bpf_prog_ops * const bpf_prog_types[] = {
|
|
#define BPF_PROG_TYPE(_id, _name) \
|
|
[_id] = & _name ## _prog_ops,
|
|
#define BPF_MAP_TYPE(_id, _ops)
|
|
#include <linux/bpf_types.h>
|
|
#undef BPF_PROG_TYPE
|
|
#undef BPF_MAP_TYPE
|
|
};
|
|
|
|
static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
|
|
{
|
|
if (type >= ARRAY_SIZE(bpf_prog_types) || !bpf_prog_types[type])
|
|
return -EINVAL;
|
|
|
|
if (!bpf_prog_is_dev_bound(prog->aux))
|
|
prog->aux->ops = bpf_prog_types[type];
|
|
else
|
|
prog->aux->ops = &bpf_offload_prog_ops;
|
|
prog->type = type;
|
|
return 0;
|
|
}
|
|
|
|
/* drop refcnt on maps used by eBPF program and free auxilary data */
|
|
static void free_used_maps(struct bpf_prog_aux *aux)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < aux->used_map_cnt; i++)
|
|
bpf_map_put(aux->used_maps[i]);
|
|
|
|
kfree(aux->used_maps);
|
|
}
|
|
|
|
int __bpf_prog_charge(struct user_struct *user, u32 pages)
|
|
{
|
|
unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
|
|
unsigned long user_bufs;
|
|
|
|
if (user) {
|
|
user_bufs = atomic_long_add_return(pages, &user->locked_vm);
|
|
if (user_bufs > memlock_limit) {
|
|
atomic_long_sub(pages, &user->locked_vm);
|
|
return -EPERM;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
|
|
{
|
|
if (user)
|
|
atomic_long_sub(pages, &user->locked_vm);
|
|
}
|
|
|
|
static int bpf_prog_charge_memlock(struct bpf_prog *prog)
|
|
{
|
|
struct user_struct *user = get_current_user();
|
|
int ret;
|
|
|
|
ret = __bpf_prog_charge(user, prog->pages);
|
|
if (ret) {
|
|
free_uid(user);
|
|
return ret;
|
|
}
|
|
|
|
prog->aux->user = user;
|
|
return 0;
|
|
}
|
|
|
|
static void bpf_prog_uncharge_memlock(struct bpf_prog *prog)
|
|
{
|
|
struct user_struct *user = prog->aux->user;
|
|
|
|
__bpf_prog_uncharge(user, prog->pages);
|
|
free_uid(user);
|
|
}
|
|
|
|
static int bpf_prog_alloc_id(struct bpf_prog *prog)
|
|
{
|
|
int id;
|
|
|
|
spin_lock_bh(&prog_idr_lock);
|
|
id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
|
|
if (id > 0)
|
|
prog->aux->id = id;
|
|
spin_unlock_bh(&prog_idr_lock);
|
|
|
|
/* id is in [1, INT_MAX) */
|
|
if (WARN_ON_ONCE(!id))
|
|
return -ENOSPC;
|
|
|
|
return id > 0 ? 0 : id;
|
|
}
|
|
|
|
static void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock)
|
|
{
|
|
/* cBPF to eBPF migrations are currently not in the idr store. */
|
|
if (!prog->aux->id)
|
|
return;
|
|
|
|
if (do_idr_lock)
|
|
spin_lock_bh(&prog_idr_lock);
|
|
else
|
|
__acquire(&prog_idr_lock);
|
|
|
|
idr_remove(&prog_idr, prog->aux->id);
|
|
|
|
if (do_idr_lock)
|
|
spin_unlock_bh(&prog_idr_lock);
|
|
else
|
|
__release(&prog_idr_lock);
|
|
}
|
|
|
|
static void __bpf_prog_put_rcu(struct rcu_head *rcu)
|
|
{
|
|
struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
|
|
|
|
free_used_maps(aux);
|
|
bpf_prog_uncharge_memlock(aux->prog);
|
|
security_bpf_prog_free(aux);
|
|
bpf_prog_free(aux->prog);
|
|
}
|
|
|
|
static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
|
|
{
|
|
if (atomic_dec_and_test(&prog->aux->refcnt)) {
|
|
trace_bpf_prog_put_rcu(prog);
|
|
/* bpf_prog_free_id() must be called first */
|
|
bpf_prog_free_id(prog, do_idr_lock);
|
|
bpf_prog_kallsyms_del(prog);
|
|
call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
|
|
}
|
|
}
|
|
|
|
void bpf_prog_put(struct bpf_prog *prog)
|
|
{
|
|
__bpf_prog_put(prog, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_prog_put);
|
|
|
|
static int bpf_prog_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct bpf_prog *prog = filp->private_data;
|
|
|
|
bpf_prog_put(prog);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
|
|
{
|
|
const struct bpf_prog *prog = filp->private_data;
|
|
char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
|
|
|
|
bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
|
|
seq_printf(m,
|
|
"prog_type:\t%u\n"
|
|
"prog_jited:\t%u\n"
|
|
"prog_tag:\t%s\n"
|
|
"memlock:\t%llu\n",
|
|
prog->type,
|
|
prog->jited,
|
|
prog_tag,
|
|
prog->pages * 1ULL << PAGE_SHIFT);
|
|
}
|
|
#endif
|
|
|
|
const struct file_operations bpf_prog_fops = {
|
|
#ifdef CONFIG_PROC_FS
|
|
.show_fdinfo = bpf_prog_show_fdinfo,
|
|
#endif
|
|
.release = bpf_prog_release,
|
|
.read = bpf_dummy_read,
|
|
.write = bpf_dummy_write,
|
|
};
|
|
|
|
int bpf_prog_new_fd(struct bpf_prog *prog)
|
|
{
|
|
int ret;
|
|
|
|
ret = security_bpf_prog(prog);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
|
|
O_RDWR | O_CLOEXEC);
|
|
}
|
|
|
|
static struct bpf_prog *____bpf_prog_get(struct fd f)
|
|
{
|
|
if (!f.file)
|
|
return ERR_PTR(-EBADF);
|
|
if (f.file->f_op != &bpf_prog_fops) {
|
|
fdput(f);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return f.file->private_data;
|
|
}
|
|
|
|
struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i)
|
|
{
|
|
if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) {
|
|
atomic_sub(i, &prog->aux->refcnt);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
return prog;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_prog_add);
|
|
|
|
void bpf_prog_sub(struct bpf_prog *prog, int i)
|
|
{
|
|
/* Only to be used for undoing previous bpf_prog_add() in some
|
|
* error path. We still know that another entity in our call
|
|
* path holds a reference to the program, thus atomic_sub() can
|
|
* be safely used in such cases!
|
|
*/
|
|
WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_prog_sub);
|
|
|
|
struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
|
|
{
|
|
return bpf_prog_add(prog, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_prog_inc);
|
|
|
|
/* prog_idr_lock should have been held */
|
|
struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
|
|
{
|
|
int refold;
|
|
|
|
refold = __atomic_add_unless(&prog->aux->refcnt, 1, 0);
|
|
|
|
if (refold >= BPF_MAX_REFCNT) {
|
|
__bpf_prog_put(prog, false);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
|
|
if (!refold)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
return prog;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
|
|
|
|
static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type)
|
|
{
|
|
struct fd f = fdget(ufd);
|
|
struct bpf_prog *prog;
|
|
|
|
prog = ____bpf_prog_get(f);
|
|
if (IS_ERR(prog))
|
|
return prog;
|
|
if (attach_type && (prog->type != *attach_type || prog->aux->offload)) {
|
|
prog = ERR_PTR(-EINVAL);
|
|
goto out;
|
|
}
|
|
|
|
prog = bpf_prog_inc(prog);
|
|
out:
|
|
fdput(f);
|
|
return prog;
|
|
}
|
|
|
|
struct bpf_prog *bpf_prog_get(u32 ufd)
|
|
{
|
|
return __bpf_prog_get(ufd, NULL);
|
|
}
|
|
|
|
struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type)
|
|
{
|
|
struct bpf_prog *prog = __bpf_prog_get(ufd, &type);
|
|
|
|
if (!IS_ERR(prog))
|
|
trace_bpf_prog_get_type(prog);
|
|
return prog;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_prog_get_type);
|
|
|
|
/* last field in 'union bpf_attr' used by this command */
|
|
#define BPF_PROG_LOAD_LAST_FIELD prog_target_ifindex
|
|
|
|
static int bpf_prog_load(union bpf_attr *attr)
|
|
{
|
|
enum bpf_prog_type type = attr->prog_type;
|
|
struct bpf_prog *prog;
|
|
int err;
|
|
char license[128];
|
|
bool is_gpl;
|
|
|
|
if (CHECK_ATTR(BPF_PROG_LOAD))
|
|
return -EINVAL;
|
|
|
|
if (attr->prog_flags & ~BPF_F_STRICT_ALIGNMENT)
|
|
return -EINVAL;
|
|
|
|
/* copy eBPF program license from user space */
|
|
if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
|
|
sizeof(license) - 1) < 0)
|
|
return -EFAULT;
|
|
license[sizeof(license) - 1] = 0;
|
|
|
|
/* eBPF programs must be GPL compatible to use GPL-ed functions */
|
|
is_gpl = license_is_gpl_compatible(license);
|
|
|
|
if (attr->insn_cnt == 0 || attr->insn_cnt > BPF_MAXINSNS)
|
|
return -E2BIG;
|
|
|
|
if (type == BPF_PROG_TYPE_KPROBE &&
|
|
attr->kern_version != LINUX_VERSION_CODE)
|
|
return -EINVAL;
|
|
|
|
if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
|
|
type != BPF_PROG_TYPE_CGROUP_SKB &&
|
|
!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* plain bpf_prog allocation */
|
|
prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
|
|
if (!prog)
|
|
return -ENOMEM;
|
|
|
|
err = security_bpf_prog_alloc(prog->aux);
|
|
if (err)
|
|
goto free_prog_nouncharge;
|
|
|
|
err = bpf_prog_charge_memlock(prog);
|
|
if (err)
|
|
goto free_prog_sec;
|
|
|
|
prog->len = attr->insn_cnt;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
|
|
bpf_prog_insn_size(prog)) != 0)
|
|
goto free_prog;
|
|
|
|
prog->orig_prog = NULL;
|
|
prog->jited = 0;
|
|
|
|
atomic_set(&prog->aux->refcnt, 1);
|
|
prog->gpl_compatible = is_gpl ? 1 : 0;
|
|
|
|
if (attr->prog_target_ifindex) {
|
|
err = bpf_prog_offload_init(prog, attr);
|
|
if (err)
|
|
goto free_prog;
|
|
}
|
|
|
|
/* find program type: socket_filter vs tracing_filter */
|
|
err = find_prog_type(type, prog);
|
|
if (err < 0)
|
|
goto free_prog;
|
|
|
|
prog->aux->load_time = ktime_get_boot_ns();
|
|
err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name);
|
|
if (err)
|
|
goto free_prog;
|
|
|
|
/* run eBPF verifier */
|
|
err = bpf_check(&prog, attr);
|
|
if (err < 0)
|
|
goto free_used_maps;
|
|
|
|
/* eBPF program is ready to be JITed */
|
|
prog = bpf_prog_select_runtime(prog, &err);
|
|
if (err < 0)
|
|
goto free_used_maps;
|
|
|
|
err = bpf_prog_alloc_id(prog);
|
|
if (err)
|
|
goto free_used_maps;
|
|
|
|
err = bpf_prog_new_fd(prog);
|
|
if (err < 0) {
|
|
/* failed to allocate fd.
|
|
* bpf_prog_put() is needed because the above
|
|
* bpf_prog_alloc_id() has published the prog
|
|
* to the userspace and the userspace may
|
|
* have refcnt-ed it through BPF_PROG_GET_FD_BY_ID.
|
|
*/
|
|
bpf_prog_put(prog);
|
|
return err;
|
|
}
|
|
|
|
bpf_prog_kallsyms_add(prog);
|
|
trace_bpf_prog_load(prog, err);
|
|
return err;
|
|
|
|
free_used_maps:
|
|
free_used_maps(prog->aux);
|
|
free_prog:
|
|
bpf_prog_uncharge_memlock(prog);
|
|
free_prog_sec:
|
|
security_bpf_prog_free(prog->aux);
|
|
free_prog_nouncharge:
|
|
bpf_prog_free(prog);
|
|
return err;
|
|
}
|
|
|
|
#define BPF_OBJ_LAST_FIELD file_flags
|
|
|
|
static int bpf_obj_pin(const union bpf_attr *attr)
|
|
{
|
|
if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
|
|
return -EINVAL;
|
|
|
|
return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
|
|
}
|
|
|
|
static int bpf_obj_get(const union bpf_attr *attr)
|
|
{
|
|
if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
|
|
attr->file_flags & ~BPF_OBJ_FLAG_MASK)
|
|
return -EINVAL;
|
|
|
|
return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
|
|
attr->file_flags);
|
|
}
|
|
|
|
#ifdef CONFIG_CGROUP_BPF
|
|
|
|
#define BPF_PROG_ATTACH_LAST_FIELD attach_flags
|
|
|
|
static int sockmap_get_from_fd(const union bpf_attr *attr, bool attach)
|
|
{
|
|
struct bpf_prog *prog = NULL;
|
|
int ufd = attr->target_fd;
|
|
struct bpf_map *map;
|
|
struct fd f;
|
|
int err;
|
|
|
|
f = fdget(ufd);
|
|
map = __bpf_map_get(f);
|
|
if (IS_ERR(map))
|
|
return PTR_ERR(map);
|
|
|
|
if (attach) {
|
|
prog = bpf_prog_get_type(attr->attach_bpf_fd,
|
|
BPF_PROG_TYPE_SK_SKB);
|
|
if (IS_ERR(prog)) {
|
|
fdput(f);
|
|
return PTR_ERR(prog);
|
|
}
|
|
}
|
|
|
|
err = sock_map_prog(map, prog, attr->attach_type);
|
|
if (err) {
|
|
fdput(f);
|
|
if (prog)
|
|
bpf_prog_put(prog);
|
|
return err;
|
|
}
|
|
|
|
fdput(f);
|
|
return 0;
|
|
}
|
|
|
|
#define BPF_F_ATTACH_MASK \
|
|
(BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI)
|
|
|
|
static int bpf_prog_attach(const union bpf_attr *attr)
|
|
{
|
|
enum bpf_prog_type ptype;
|
|
struct bpf_prog *prog;
|
|
struct cgroup *cgrp;
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (CHECK_ATTR(BPF_PROG_ATTACH))
|
|
return -EINVAL;
|
|
|
|
if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
|
|
return -EINVAL;
|
|
|
|
switch (attr->attach_type) {
|
|
case BPF_CGROUP_INET_INGRESS:
|
|
case BPF_CGROUP_INET_EGRESS:
|
|
ptype = BPF_PROG_TYPE_CGROUP_SKB;
|
|
break;
|
|
case BPF_CGROUP_INET_SOCK_CREATE:
|
|
ptype = BPF_PROG_TYPE_CGROUP_SOCK;
|
|
break;
|
|
case BPF_CGROUP_SOCK_OPS:
|
|
ptype = BPF_PROG_TYPE_SOCK_OPS;
|
|
break;
|
|
case BPF_SK_SKB_STREAM_PARSER:
|
|
case BPF_SK_SKB_STREAM_VERDICT:
|
|
return sockmap_get_from_fd(attr, true);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
|
|
if (IS_ERR(prog))
|
|
return PTR_ERR(prog);
|
|
|
|
cgrp = cgroup_get_from_fd(attr->target_fd);
|
|
if (IS_ERR(cgrp)) {
|
|
bpf_prog_put(prog);
|
|
return PTR_ERR(cgrp);
|
|
}
|
|
|
|
ret = cgroup_bpf_attach(cgrp, prog, attr->attach_type,
|
|
attr->attach_flags);
|
|
if (ret)
|
|
bpf_prog_put(prog);
|
|
cgroup_put(cgrp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define BPF_PROG_DETACH_LAST_FIELD attach_type
|
|
|
|
static int bpf_prog_detach(const union bpf_attr *attr)
|
|
{
|
|
enum bpf_prog_type ptype;
|
|
struct bpf_prog *prog;
|
|
struct cgroup *cgrp;
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (CHECK_ATTR(BPF_PROG_DETACH))
|
|
return -EINVAL;
|
|
|
|
switch (attr->attach_type) {
|
|
case BPF_CGROUP_INET_INGRESS:
|
|
case BPF_CGROUP_INET_EGRESS:
|
|
ptype = BPF_PROG_TYPE_CGROUP_SKB;
|
|
break;
|
|
case BPF_CGROUP_INET_SOCK_CREATE:
|
|
ptype = BPF_PROG_TYPE_CGROUP_SOCK;
|
|
break;
|
|
case BPF_CGROUP_SOCK_OPS:
|
|
ptype = BPF_PROG_TYPE_SOCK_OPS;
|
|
break;
|
|
case BPF_SK_SKB_STREAM_PARSER:
|
|
case BPF_SK_SKB_STREAM_VERDICT:
|
|
return sockmap_get_from_fd(attr, false);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
cgrp = cgroup_get_from_fd(attr->target_fd);
|
|
if (IS_ERR(cgrp))
|
|
return PTR_ERR(cgrp);
|
|
|
|
prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
|
|
if (IS_ERR(prog))
|
|
prog = NULL;
|
|
|
|
ret = cgroup_bpf_detach(cgrp, prog, attr->attach_type, 0);
|
|
if (prog)
|
|
bpf_prog_put(prog);
|
|
cgroup_put(cgrp);
|
|
return ret;
|
|
}
|
|
|
|
#define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
|
|
|
|
static int bpf_prog_query(const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct cgroup *cgrp;
|
|
int ret;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
if (CHECK_ATTR(BPF_PROG_QUERY))
|
|
return -EINVAL;
|
|
if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
|
|
return -EINVAL;
|
|
|
|
switch (attr->query.attach_type) {
|
|
case BPF_CGROUP_INET_INGRESS:
|
|
case BPF_CGROUP_INET_EGRESS:
|
|
case BPF_CGROUP_INET_SOCK_CREATE:
|
|
case BPF_CGROUP_SOCK_OPS:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
cgrp = cgroup_get_from_fd(attr->query.target_fd);
|
|
if (IS_ERR(cgrp))
|
|
return PTR_ERR(cgrp);
|
|
ret = cgroup_bpf_query(cgrp, attr, uattr);
|
|
cgroup_put(cgrp);
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_CGROUP_BPF */
|
|
|
|
#define BPF_PROG_TEST_RUN_LAST_FIELD test.duration
|
|
|
|
static int bpf_prog_test_run(const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct bpf_prog *prog;
|
|
int ret = -ENOTSUPP;
|
|
|
|
if (CHECK_ATTR(BPF_PROG_TEST_RUN))
|
|
return -EINVAL;
|
|
|
|
prog = bpf_prog_get(attr->test.prog_fd);
|
|
if (IS_ERR(prog))
|
|
return PTR_ERR(prog);
|
|
|
|
if (prog->aux->ops->test_run)
|
|
ret = prog->aux->ops->test_run(prog, attr, uattr);
|
|
|
|
bpf_prog_put(prog);
|
|
return ret;
|
|
}
|
|
|
|
#define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
|
|
|
|
static int bpf_obj_get_next_id(const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr,
|
|
struct idr *idr,
|
|
spinlock_t *lock)
|
|
{
|
|
u32 next_id = attr->start_id;
|
|
int err = 0;
|
|
|
|
if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
|
|
return -EINVAL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
next_id++;
|
|
spin_lock_bh(lock);
|
|
if (!idr_get_next(idr, &next_id))
|
|
err = -ENOENT;
|
|
spin_unlock_bh(lock);
|
|
|
|
if (!err)
|
|
err = put_user(next_id, &uattr->next_id);
|
|
|
|
return err;
|
|
}
|
|
|
|
#define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
|
|
|
|
static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
|
|
{
|
|
struct bpf_prog *prog;
|
|
u32 id = attr->prog_id;
|
|
int fd;
|
|
|
|
if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
|
|
return -EINVAL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
spin_lock_bh(&prog_idr_lock);
|
|
prog = idr_find(&prog_idr, id);
|
|
if (prog)
|
|
prog = bpf_prog_inc_not_zero(prog);
|
|
else
|
|
prog = ERR_PTR(-ENOENT);
|
|
spin_unlock_bh(&prog_idr_lock);
|
|
|
|
if (IS_ERR(prog))
|
|
return PTR_ERR(prog);
|
|
|
|
fd = bpf_prog_new_fd(prog);
|
|
if (fd < 0)
|
|
bpf_prog_put(prog);
|
|
|
|
return fd;
|
|
}
|
|
|
|
#define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
|
|
|
|
static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
|
|
{
|
|
struct bpf_map *map;
|
|
u32 id = attr->map_id;
|
|
int f_flags;
|
|
int fd;
|
|
|
|
if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
|
|
attr->open_flags & ~BPF_OBJ_FLAG_MASK)
|
|
return -EINVAL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
f_flags = bpf_get_file_flag(attr->open_flags);
|
|
if (f_flags < 0)
|
|
return f_flags;
|
|
|
|
spin_lock_bh(&map_idr_lock);
|
|
map = idr_find(&map_idr, id);
|
|
if (map)
|
|
map = bpf_map_inc_not_zero(map, true);
|
|
else
|
|
map = ERR_PTR(-ENOENT);
|
|
spin_unlock_bh(&map_idr_lock);
|
|
|
|
if (IS_ERR(map))
|
|
return PTR_ERR(map);
|
|
|
|
fd = bpf_map_new_fd(map, f_flags);
|
|
if (fd < 0)
|
|
bpf_map_put(map);
|
|
|
|
return fd;
|
|
}
|
|
|
|
static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
|
|
const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
|
|
struct bpf_prog_info info = {};
|
|
u32 info_len = attr->info.info_len;
|
|
char __user *uinsns;
|
|
u32 ulen;
|
|
int err;
|
|
|
|
err = check_uarg_tail_zero(uinfo, sizeof(info), info_len);
|
|
if (err)
|
|
return err;
|
|
info_len = min_t(u32, sizeof(info), info_len);
|
|
|
|
if (copy_from_user(&info, uinfo, info_len))
|
|
return -EFAULT;
|
|
|
|
info.type = prog->type;
|
|
info.id = prog->aux->id;
|
|
info.load_time = prog->aux->load_time;
|
|
info.created_by_uid = from_kuid_munged(current_user_ns(),
|
|
prog->aux->user->uid);
|
|
|
|
memcpy(info.tag, prog->tag, sizeof(prog->tag));
|
|
memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
|
|
|
|
ulen = info.nr_map_ids;
|
|
info.nr_map_ids = prog->aux->used_map_cnt;
|
|
ulen = min_t(u32, info.nr_map_ids, ulen);
|
|
if (ulen) {
|
|
u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
|
|
u32 i;
|
|
|
|
for (i = 0; i < ulen; i++)
|
|
if (put_user(prog->aux->used_maps[i]->id,
|
|
&user_map_ids[i]))
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
info.jited_prog_len = 0;
|
|
info.xlated_prog_len = 0;
|
|
goto done;
|
|
}
|
|
|
|
ulen = info.jited_prog_len;
|
|
info.jited_prog_len = prog->jited_len;
|
|
if (info.jited_prog_len && ulen) {
|
|
uinsns = u64_to_user_ptr(info.jited_prog_insns);
|
|
ulen = min_t(u32, info.jited_prog_len, ulen);
|
|
if (copy_to_user(uinsns, prog->bpf_func, ulen))
|
|
return -EFAULT;
|
|
}
|
|
|
|
ulen = info.xlated_prog_len;
|
|
info.xlated_prog_len = bpf_prog_insn_size(prog);
|
|
if (info.xlated_prog_len && ulen) {
|
|
uinsns = u64_to_user_ptr(info.xlated_prog_insns);
|
|
ulen = min_t(u32, info.xlated_prog_len, ulen);
|
|
if (copy_to_user(uinsns, prog->insnsi, ulen))
|
|
return -EFAULT;
|
|
}
|
|
|
|
done:
|
|
if (copy_to_user(uinfo, &info, info_len) ||
|
|
put_user(info_len, &uattr->info.info_len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bpf_map_get_info_by_fd(struct bpf_map *map,
|
|
const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
|
|
struct bpf_map_info info = {};
|
|
u32 info_len = attr->info.info_len;
|
|
int err;
|
|
|
|
err = check_uarg_tail_zero(uinfo, sizeof(info), info_len);
|
|
if (err)
|
|
return err;
|
|
info_len = min_t(u32, sizeof(info), info_len);
|
|
|
|
info.type = map->map_type;
|
|
info.id = map->id;
|
|
info.key_size = map->key_size;
|
|
info.value_size = map->value_size;
|
|
info.max_entries = map->max_entries;
|
|
info.map_flags = map->map_flags;
|
|
memcpy(info.name, map->name, sizeof(map->name));
|
|
|
|
if (copy_to_user(uinfo, &info, info_len) ||
|
|
put_user(info_len, &uattr->info.info_len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
|
|
|
|
static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr)
|
|
{
|
|
int ufd = attr->info.bpf_fd;
|
|
struct fd f;
|
|
int err;
|
|
|
|
if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
|
|
return -EINVAL;
|
|
|
|
f = fdget(ufd);
|
|
if (!f.file)
|
|
return -EBADFD;
|
|
|
|
if (f.file->f_op == &bpf_prog_fops)
|
|
err = bpf_prog_get_info_by_fd(f.file->private_data, attr,
|
|
uattr);
|
|
else if (f.file->f_op == &bpf_map_fops)
|
|
err = bpf_map_get_info_by_fd(f.file->private_data, attr,
|
|
uattr);
|
|
else
|
|
err = -EINVAL;
|
|
|
|
fdput(f);
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
|
|
{
|
|
union bpf_attr attr = {};
|
|
int err;
|
|
|
|
if (!capable(CAP_SYS_ADMIN) && sysctl_unprivileged_bpf_disabled)
|
|
return -EPERM;
|
|
|
|
err = check_uarg_tail_zero(uattr, sizeof(attr), size);
|
|
if (err)
|
|
return err;
|
|
size = min_t(u32, size, sizeof(attr));
|
|
|
|
/* copy attributes from user space, may be less than sizeof(bpf_attr) */
|
|
if (copy_from_user(&attr, uattr, size) != 0)
|
|
return -EFAULT;
|
|
|
|
err = security_bpf(cmd, &attr, size);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
switch (cmd) {
|
|
case BPF_MAP_CREATE:
|
|
err = map_create(&attr);
|
|
break;
|
|
case BPF_MAP_LOOKUP_ELEM:
|
|
err = map_lookup_elem(&attr);
|
|
break;
|
|
case BPF_MAP_UPDATE_ELEM:
|
|
err = map_update_elem(&attr);
|
|
break;
|
|
case BPF_MAP_DELETE_ELEM:
|
|
err = map_delete_elem(&attr);
|
|
break;
|
|
case BPF_MAP_GET_NEXT_KEY:
|
|
err = map_get_next_key(&attr);
|
|
break;
|
|
case BPF_PROG_LOAD:
|
|
err = bpf_prog_load(&attr);
|
|
break;
|
|
case BPF_OBJ_PIN:
|
|
err = bpf_obj_pin(&attr);
|
|
break;
|
|
case BPF_OBJ_GET:
|
|
err = bpf_obj_get(&attr);
|
|
break;
|
|
#ifdef CONFIG_CGROUP_BPF
|
|
case BPF_PROG_ATTACH:
|
|
err = bpf_prog_attach(&attr);
|
|
break;
|
|
case BPF_PROG_DETACH:
|
|
err = bpf_prog_detach(&attr);
|
|
break;
|
|
case BPF_PROG_QUERY:
|
|
err = bpf_prog_query(&attr, uattr);
|
|
break;
|
|
#endif
|
|
case BPF_PROG_TEST_RUN:
|
|
err = bpf_prog_test_run(&attr, uattr);
|
|
break;
|
|
case BPF_PROG_GET_NEXT_ID:
|
|
err = bpf_obj_get_next_id(&attr, uattr,
|
|
&prog_idr, &prog_idr_lock);
|
|
break;
|
|
case BPF_MAP_GET_NEXT_ID:
|
|
err = bpf_obj_get_next_id(&attr, uattr,
|
|
&map_idr, &map_idr_lock);
|
|
break;
|
|
case BPF_PROG_GET_FD_BY_ID:
|
|
err = bpf_prog_get_fd_by_id(&attr);
|
|
break;
|
|
case BPF_MAP_GET_FD_BY_ID:
|
|
err = bpf_map_get_fd_by_id(&attr);
|
|
break;
|
|
case BPF_OBJ_GET_INFO_BY_FD:
|
|
err = bpf_obj_get_info_by_fd(&attr, uattr);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|