1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of version 2 of the GNU General Public
5 * License as published by the Free Software Foundation.
7 * This program is distributed in the hope that it will be useful, but
8 * WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * General Public License for more details.
12 #include <linux/bpf.h>
13 #include <linux/bpf_trace.h>
14 #include <linux/syscalls.h>
15 #include <linux/slab.h>
16 #include <linux/sched/signal.h>
17 #include <linux/vmalloc.h>
18 #include <linux/mmzone.h>
19 #include <linux/anon_inodes.h>
20 #include <linux/file.h>
21 #include <linux/license.h>
22 #include <linux/filter.h>
23 #include <linux/version.h>
24 #include <linux/kernel.h>
25 #include <linux/idr.h>
27 #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \
28 (map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
29 (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
30 (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
31 #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
32 #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map))
34 DEFINE_PER_CPU(int, bpf_prog_active
);
35 static DEFINE_IDR(prog_idr
);
36 static DEFINE_SPINLOCK(prog_idr_lock
);
37 static DEFINE_IDR(map_idr
);
38 static DEFINE_SPINLOCK(map_idr_lock
);
40 int sysctl_unprivileged_bpf_disabled __read_mostly
;
42 static const struct bpf_map_ops
* const bpf_map_types
[] = {
43 #define BPF_PROG_TYPE(_id, _ops)
44 #define BPF_MAP_TYPE(_id, _ops) \
46 #include <linux/bpf_types.h>
52 * If we're handed a bigger struct than we know of, ensure all the unknown bits
53 * are 0 - i.e. new user-space does not rely on any kernel feature extensions
54 * we don't know about yet.
56 * There is a ToCToU between this function call and the following
57 * copy_from_user() call. However, this is not a concern since this function is
58 * meant to be a future-proofing of bits.
60 static int check_uarg_tail_zero(void __user
*uaddr
,
64 unsigned char __user
*addr
;
65 unsigned char __user
*end
;
69 if (unlikely(actual_size
> PAGE_SIZE
)) /* silly large */
72 if (unlikely(!access_ok(VERIFY_READ
, uaddr
, actual_size
)))
75 if (actual_size
<= expected_size
)
78 addr
= uaddr
+ expected_size
;
79 end
= uaddr
+ actual_size
;
81 for (; addr
< end
; addr
++) {
82 err
= get_user(val
, addr
);
92 static struct bpf_map
*find_and_alloc_map(union bpf_attr
*attr
)
96 if (attr
->map_type
>= ARRAY_SIZE(bpf_map_types
) ||
97 !bpf_map_types
[attr
->map_type
])
98 return ERR_PTR(-EINVAL
);
100 map
= bpf_map_types
[attr
->map_type
]->map_alloc(attr
);
103 map
->ops
= bpf_map_types
[attr
->map_type
];
104 map
->map_type
= attr
->map_type
;
108 void *bpf_map_area_alloc(size_t size
, int numa_node
)
110 /* We definitely need __GFP_NORETRY, so OOM killer doesn't
111 * trigger under memory pressure as we really just want to
114 const gfp_t flags
= __GFP_NOWARN
| __GFP_NORETRY
| __GFP_ZERO
;
117 if (size
<= (PAGE_SIZE
<< PAGE_ALLOC_COSTLY_ORDER
)) {
118 area
= kmalloc_node(size
, GFP_USER
| flags
, numa_node
);
123 return __vmalloc_node_flags_caller(size
, numa_node
, GFP_KERNEL
| flags
,
124 __builtin_return_address(0));
127 void bpf_map_area_free(void *area
)
132 int bpf_map_precharge_memlock(u32 pages
)
134 struct user_struct
*user
= get_current_user();
135 unsigned long memlock_limit
, cur
;
137 memlock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
138 cur
= atomic_long_read(&user
->locked_vm
);
140 if (cur
+ pages
> memlock_limit
)
145 static int bpf_map_charge_memlock(struct bpf_map
*map
)
147 struct user_struct
*user
= get_current_user();
148 unsigned long memlock_limit
;
150 memlock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
152 atomic_long_add(map
->pages
, &user
->locked_vm
);
154 if (atomic_long_read(&user
->locked_vm
) > memlock_limit
) {
155 atomic_long_sub(map
->pages
, &user
->locked_vm
);
163 static void bpf_map_uncharge_memlock(struct bpf_map
*map
)
165 struct user_struct
*user
= map
->user
;
167 atomic_long_sub(map
->pages
, &user
->locked_vm
);
171 static int bpf_map_alloc_id(struct bpf_map
*map
)
175 spin_lock_bh(&map_idr_lock
);
176 id
= idr_alloc_cyclic(&map_idr
, map
, 1, INT_MAX
, GFP_ATOMIC
);
179 spin_unlock_bh(&map_idr_lock
);
181 if (WARN_ON_ONCE(!id
))
184 return id
> 0 ? 0 : id
;
187 static void bpf_map_free_id(struct bpf_map
*map
, bool do_idr_lock
)
190 spin_lock_bh(&map_idr_lock
);
192 __acquire(&map_idr_lock
);
194 idr_remove(&map_idr
, map
->id
);
197 spin_unlock_bh(&map_idr_lock
);
199 __release(&map_idr_lock
);
202 /* called from workqueue */
203 static void bpf_map_free_deferred(struct work_struct
*work
)
205 struct bpf_map
*map
= container_of(work
, struct bpf_map
, work
);
207 bpf_map_uncharge_memlock(map
);
208 /* implementation dependent freeing */
209 map
->ops
->map_free(map
);
212 static void bpf_map_put_uref(struct bpf_map
*map
)
214 if (atomic_dec_and_test(&map
->usercnt
)) {
215 if (map
->map_type
== BPF_MAP_TYPE_PROG_ARRAY
)
216 bpf_fd_array_map_clear(map
);
220 /* decrement map refcnt and schedule it for freeing via workqueue
221 * (unrelying map implementation ops->map_free() might sleep)
223 static void __bpf_map_put(struct bpf_map
*map
, bool do_idr_lock
)
225 if (atomic_dec_and_test(&map
->refcnt
)) {
226 /* bpf_map_free_id() must be called first */
227 bpf_map_free_id(map
, do_idr_lock
);
228 INIT_WORK(&map
->work
, bpf_map_free_deferred
);
229 schedule_work(&map
->work
);
233 void bpf_map_put(struct bpf_map
*map
)
235 __bpf_map_put(map
, true);
238 void bpf_map_put_with_uref(struct bpf_map
*map
)
240 bpf_map_put_uref(map
);
244 static int bpf_map_release(struct inode
*inode
, struct file
*filp
)
246 struct bpf_map
*map
= filp
->private_data
;
248 if (map
->ops
->map_release
)
249 map
->ops
->map_release(map
, filp
);
251 bpf_map_put_with_uref(map
);
255 #ifdef CONFIG_PROC_FS
256 static void bpf_map_show_fdinfo(struct seq_file
*m
, struct file
*filp
)
258 const struct bpf_map
*map
= filp
->private_data
;
259 const struct bpf_array
*array
;
260 u32 owner_prog_type
= 0;
263 if (map
->map_type
== BPF_MAP_TYPE_PROG_ARRAY
) {
264 array
= container_of(map
, struct bpf_array
, map
);
265 owner_prog_type
= array
->owner_prog_type
;
266 owner_jited
= array
->owner_jited
;
281 map
->pages
* 1ULL << PAGE_SHIFT
);
283 if (owner_prog_type
) {
284 seq_printf(m
, "owner_prog_type:\t%u\n",
286 seq_printf(m
, "owner_jited:\t%u\n",
292 static const struct file_operations bpf_map_fops
= {
293 #ifdef CONFIG_PROC_FS
294 .show_fdinfo
= bpf_map_show_fdinfo
,
296 .release
= bpf_map_release
,
299 int bpf_map_new_fd(struct bpf_map
*map
)
301 return anon_inode_getfd("bpf-map", &bpf_map_fops
, map
,
305 /* helper macro to check that unused fields 'union bpf_attr' are zero */
306 #define CHECK_ATTR(CMD) \
307 memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
308 sizeof(attr->CMD##_LAST_FIELD), 0, \
310 offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
311 sizeof(attr->CMD##_LAST_FIELD)) != NULL
313 #define BPF_MAP_CREATE_LAST_FIELD numa_node
314 /* called via syscall */
315 static int map_create(union bpf_attr
*attr
)
317 int numa_node
= bpf_map_attr_numa_node(attr
);
321 err
= CHECK_ATTR(BPF_MAP_CREATE
);
325 if (numa_node
!= NUMA_NO_NODE
&&
326 ((unsigned int)numa_node
>= nr_node_ids
||
327 !node_online(numa_node
)))
330 /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
331 map
= find_and_alloc_map(attr
);
335 atomic_set(&map
->refcnt
, 1);
336 atomic_set(&map
->usercnt
, 1);
338 err
= bpf_map_charge_memlock(map
);
340 goto free_map_nouncharge
;
342 err
= bpf_map_alloc_id(map
);
346 err
= bpf_map_new_fd(map
);
348 /* failed to allocate fd.
349 * bpf_map_put() is needed because the above
350 * bpf_map_alloc_id() has published the map
351 * to the userspace and the userspace may
352 * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
358 trace_bpf_map_create(map
, err
);
362 bpf_map_uncharge_memlock(map
);
364 map
->ops
->map_free(map
);
368 /* if error is returned, fd is released.
369 * On success caller should complete fd access with matching fdput()
371 struct bpf_map
*__bpf_map_get(struct fd f
)
374 return ERR_PTR(-EBADF
);
375 if (f
.file
->f_op
!= &bpf_map_fops
) {
377 return ERR_PTR(-EINVAL
);
380 return f
.file
->private_data
;
383 /* prog's and map's refcnt limit */
384 #define BPF_MAX_REFCNT 32768
386 struct bpf_map
*bpf_map_inc(struct bpf_map
*map
, bool uref
)
388 if (atomic_inc_return(&map
->refcnt
) > BPF_MAX_REFCNT
) {
389 atomic_dec(&map
->refcnt
);
390 return ERR_PTR(-EBUSY
);
393 atomic_inc(&map
->usercnt
);
397 struct bpf_map
*bpf_map_get_with_uref(u32 ufd
)
399 struct fd f
= fdget(ufd
);
402 map
= __bpf_map_get(f
);
406 map
= bpf_map_inc(map
, true);
412 /* map_idr_lock should have been held */
413 static struct bpf_map
*bpf_map_inc_not_zero(struct bpf_map
*map
,
418 refold
= __atomic_add_unless(&map
->refcnt
, 1, 0);
420 if (refold
>= BPF_MAX_REFCNT
) {
421 __bpf_map_put(map
, false);
422 return ERR_PTR(-EBUSY
);
426 return ERR_PTR(-ENOENT
);
429 atomic_inc(&map
->usercnt
);
434 int __weak
bpf_stackmap_copy(struct bpf_map
*map
, void *key
, void *value
)
439 /* last field in 'union bpf_attr' used by this command */
440 #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value
442 static int map_lookup_elem(union bpf_attr
*attr
)
444 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
445 void __user
*uvalue
= u64_to_user_ptr(attr
->value
);
446 int ufd
= attr
->map_fd
;
448 void *key
, *value
, *ptr
;
453 if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM
))
457 map
= __bpf_map_get(f
);
461 key
= memdup_user(ukey
, map
->key_size
);
467 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
468 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
||
469 map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
)
470 value_size
= round_up(map
->value_size
, 8) * num_possible_cpus();
471 else if (IS_FD_MAP(map
))
472 value_size
= sizeof(u32
);
474 value_size
= map
->value_size
;
477 value
= kmalloc(value_size
, GFP_USER
| __GFP_NOWARN
);
481 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
482 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
) {
483 err
= bpf_percpu_hash_copy(map
, key
, value
);
484 } else if (map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
) {
485 err
= bpf_percpu_array_copy(map
, key
, value
);
486 } else if (map
->map_type
== BPF_MAP_TYPE_STACK_TRACE
) {
487 err
= bpf_stackmap_copy(map
, key
, value
);
488 } else if (IS_FD_ARRAY(map
)) {
489 err
= bpf_fd_array_map_lookup_elem(map
, key
, value
);
490 } else if (IS_FD_HASH(map
)) {
491 err
= bpf_fd_htab_map_lookup_elem(map
, key
, value
);
494 ptr
= map
->ops
->map_lookup_elem(map
, key
);
496 memcpy(value
, ptr
, value_size
);
498 err
= ptr
? 0 : -ENOENT
;
505 if (copy_to_user(uvalue
, value
, value_size
) != 0)
508 trace_bpf_map_lookup_elem(map
, ufd
, key
, value
);
520 #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
522 static int map_update_elem(union bpf_attr
*attr
)
524 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
525 void __user
*uvalue
= u64_to_user_ptr(attr
->value
);
526 int ufd
= attr
->map_fd
;
533 if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM
))
537 map
= __bpf_map_get(f
);
541 key
= memdup_user(ukey
, map
->key_size
);
547 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
548 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
||
549 map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
)
550 value_size
= round_up(map
->value_size
, 8) * num_possible_cpus();
552 value_size
= map
->value_size
;
555 value
= kmalloc(value_size
, GFP_USER
| __GFP_NOWARN
);
560 if (copy_from_user(value
, uvalue
, value_size
) != 0)
563 /* must increment bpf_prog_active to avoid kprobe+bpf triggering from
564 * inside bpf map update or delete otherwise deadlocks are possible
567 __this_cpu_inc(bpf_prog_active
);
568 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
569 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
) {
570 err
= bpf_percpu_hash_update(map
, key
, value
, attr
->flags
);
571 } else if (map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
) {
572 err
= bpf_percpu_array_update(map
, key
, value
, attr
->flags
);
573 } else if (map
->map_type
== BPF_MAP_TYPE_PERF_EVENT_ARRAY
||
574 map
->map_type
== BPF_MAP_TYPE_PROG_ARRAY
||
575 map
->map_type
== BPF_MAP_TYPE_CGROUP_ARRAY
||
576 map
->map_type
== BPF_MAP_TYPE_ARRAY_OF_MAPS
) {
578 err
= bpf_fd_array_map_update_elem(map
, f
.file
, key
, value
,
581 } else if (map
->map_type
== BPF_MAP_TYPE_HASH_OF_MAPS
) {
583 err
= bpf_fd_htab_map_update_elem(map
, f
.file
, key
, value
,
588 err
= map
->ops
->map_update_elem(map
, key
, value
, attr
->flags
);
591 __this_cpu_dec(bpf_prog_active
);
595 trace_bpf_map_update_elem(map
, ufd
, key
, value
);
605 #define BPF_MAP_DELETE_ELEM_LAST_FIELD key
607 static int map_delete_elem(union bpf_attr
*attr
)
609 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
610 int ufd
= attr
->map_fd
;
616 if (CHECK_ATTR(BPF_MAP_DELETE_ELEM
))
620 map
= __bpf_map_get(f
);
624 key
= memdup_user(ukey
, map
->key_size
);
631 __this_cpu_inc(bpf_prog_active
);
633 err
= map
->ops
->map_delete_elem(map
, key
);
635 __this_cpu_dec(bpf_prog_active
);
639 trace_bpf_map_delete_elem(map
, ufd
, key
);
646 /* last field in 'union bpf_attr' used by this command */
647 #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
649 static int map_get_next_key(union bpf_attr
*attr
)
651 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
652 void __user
*unext_key
= u64_to_user_ptr(attr
->next_key
);
653 int ufd
= attr
->map_fd
;
655 void *key
, *next_key
;
659 if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY
))
663 map
= __bpf_map_get(f
);
668 key
= memdup_user(ukey
, map
->key_size
);
678 next_key
= kmalloc(map
->key_size
, GFP_USER
);
683 err
= map
->ops
->map_get_next_key(map
, key
, next_key
);
689 if (copy_to_user(unext_key
, next_key
, map
->key_size
) != 0)
692 trace_bpf_map_next_key(map
, ufd
, key
, next_key
);
704 static const struct bpf_verifier_ops
* const bpf_prog_types
[] = {
705 #define BPF_PROG_TYPE(_id, _ops) \
707 #define BPF_MAP_TYPE(_id, _ops)
708 #include <linux/bpf_types.h>
713 static int find_prog_type(enum bpf_prog_type type
, struct bpf_prog
*prog
)
715 if (type
>= ARRAY_SIZE(bpf_prog_types
) || !bpf_prog_types
[type
])
718 prog
->aux
->ops
= bpf_prog_types
[type
];
723 /* drop refcnt on maps used by eBPF program and free auxilary data */
724 static void free_used_maps(struct bpf_prog_aux
*aux
)
728 for (i
= 0; i
< aux
->used_map_cnt
; i
++)
729 bpf_map_put(aux
->used_maps
[i
]);
731 kfree(aux
->used_maps
);
734 int __bpf_prog_charge(struct user_struct
*user
, u32 pages
)
736 unsigned long memlock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
737 unsigned long user_bufs
;
740 user_bufs
= atomic_long_add_return(pages
, &user
->locked_vm
);
741 if (user_bufs
> memlock_limit
) {
742 atomic_long_sub(pages
, &user
->locked_vm
);
750 void __bpf_prog_uncharge(struct user_struct
*user
, u32 pages
)
753 atomic_long_sub(pages
, &user
->locked_vm
);
756 static int bpf_prog_charge_memlock(struct bpf_prog
*prog
)
758 struct user_struct
*user
= get_current_user();
761 ret
= __bpf_prog_charge(user
, prog
->pages
);
767 prog
->aux
->user
= user
;
771 static void bpf_prog_uncharge_memlock(struct bpf_prog
*prog
)
773 struct user_struct
*user
= prog
->aux
->user
;
775 __bpf_prog_uncharge(user
, prog
->pages
);
779 static int bpf_prog_alloc_id(struct bpf_prog
*prog
)
783 spin_lock_bh(&prog_idr_lock
);
784 id
= idr_alloc_cyclic(&prog_idr
, prog
, 1, INT_MAX
, GFP_ATOMIC
);
787 spin_unlock_bh(&prog_idr_lock
);
789 /* id is in [1, INT_MAX) */
790 if (WARN_ON_ONCE(!id
))
793 return id
> 0 ? 0 : id
;
796 static void bpf_prog_free_id(struct bpf_prog
*prog
, bool do_idr_lock
)
798 /* cBPF to eBPF migrations are currently not in the idr store. */
803 spin_lock_bh(&prog_idr_lock
);
805 __acquire(&prog_idr_lock
);
807 idr_remove(&prog_idr
, prog
->aux
->id
);
810 spin_unlock_bh(&prog_idr_lock
);
812 __release(&prog_idr_lock
);
815 static void __bpf_prog_put_rcu(struct rcu_head
*rcu
)
817 struct bpf_prog_aux
*aux
= container_of(rcu
, struct bpf_prog_aux
, rcu
);
820 bpf_prog_uncharge_memlock(aux
->prog
);
821 bpf_prog_free(aux
->prog
);
824 static void __bpf_prog_put(struct bpf_prog
*prog
, bool do_idr_lock
)
826 if (atomic_dec_and_test(&prog
->aux
->refcnt
)) {
827 trace_bpf_prog_put_rcu(prog
);
828 /* bpf_prog_free_id() must be called first */
829 bpf_prog_free_id(prog
, do_idr_lock
);
830 bpf_prog_kallsyms_del(prog
);
831 call_rcu(&prog
->aux
->rcu
, __bpf_prog_put_rcu
);
835 void bpf_prog_put(struct bpf_prog
*prog
)
837 __bpf_prog_put(prog
, true);
839 EXPORT_SYMBOL_GPL(bpf_prog_put
);
841 static int bpf_prog_release(struct inode
*inode
, struct file
*filp
)
843 struct bpf_prog
*prog
= filp
->private_data
;
849 #ifdef CONFIG_PROC_FS
850 static void bpf_prog_show_fdinfo(struct seq_file
*m
, struct file
*filp
)
852 const struct bpf_prog
*prog
= filp
->private_data
;
853 char prog_tag
[sizeof(prog
->tag
) * 2 + 1] = { };
855 bin2hex(prog_tag
, prog
->tag
, sizeof(prog
->tag
));
864 prog
->pages
* 1ULL << PAGE_SHIFT
);
868 static const struct file_operations bpf_prog_fops
= {
869 #ifdef CONFIG_PROC_FS
870 .show_fdinfo
= bpf_prog_show_fdinfo
,
872 .release
= bpf_prog_release
,
875 int bpf_prog_new_fd(struct bpf_prog
*prog
)
877 return anon_inode_getfd("bpf-prog", &bpf_prog_fops
, prog
,
881 static struct bpf_prog
*____bpf_prog_get(struct fd f
)
884 return ERR_PTR(-EBADF
);
885 if (f
.file
->f_op
!= &bpf_prog_fops
) {
887 return ERR_PTR(-EINVAL
);
890 return f
.file
->private_data
;
893 struct bpf_prog
*bpf_prog_add(struct bpf_prog
*prog
, int i
)
895 if (atomic_add_return(i
, &prog
->aux
->refcnt
) > BPF_MAX_REFCNT
) {
896 atomic_sub(i
, &prog
->aux
->refcnt
);
897 return ERR_PTR(-EBUSY
);
901 EXPORT_SYMBOL_GPL(bpf_prog_add
);
903 void bpf_prog_sub(struct bpf_prog
*prog
, int i
)
905 /* Only to be used for undoing previous bpf_prog_add() in some
906 * error path. We still know that another entity in our call
907 * path holds a reference to the program, thus atomic_sub() can
908 * be safely used in such cases!
910 WARN_ON(atomic_sub_return(i
, &prog
->aux
->refcnt
) == 0);
912 EXPORT_SYMBOL_GPL(bpf_prog_sub
);
914 struct bpf_prog
*bpf_prog_inc(struct bpf_prog
*prog
)
916 return bpf_prog_add(prog
, 1);
918 EXPORT_SYMBOL_GPL(bpf_prog_inc
);
920 /* prog_idr_lock should have been held */
921 struct bpf_prog
*bpf_prog_inc_not_zero(struct bpf_prog
*prog
)
925 refold
= __atomic_add_unless(&prog
->aux
->refcnt
, 1, 0);
927 if (refold
>= BPF_MAX_REFCNT
) {
928 __bpf_prog_put(prog
, false);
929 return ERR_PTR(-EBUSY
);
933 return ERR_PTR(-ENOENT
);
937 EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero
);
939 static struct bpf_prog
*__bpf_prog_get(u32 ufd
, enum bpf_prog_type
*type
)
941 struct fd f
= fdget(ufd
);
942 struct bpf_prog
*prog
;
944 prog
= ____bpf_prog_get(f
);
947 if (type
&& prog
->type
!= *type
) {
948 prog
= ERR_PTR(-EINVAL
);
952 prog
= bpf_prog_inc(prog
);
958 struct bpf_prog
*bpf_prog_get(u32 ufd
)
960 return __bpf_prog_get(ufd
, NULL
);
963 struct bpf_prog
*bpf_prog_get_type(u32 ufd
, enum bpf_prog_type type
)
965 struct bpf_prog
*prog
= __bpf_prog_get(ufd
, &type
);
968 trace_bpf_prog_get_type(prog
);
971 EXPORT_SYMBOL_GPL(bpf_prog_get_type
);
973 /* last field in 'union bpf_attr' used by this command */
974 #define BPF_PROG_LOAD_LAST_FIELD prog_flags
976 static int bpf_prog_load(union bpf_attr
*attr
)
978 enum bpf_prog_type type
= attr
->prog_type
;
979 struct bpf_prog
*prog
;
984 if (CHECK_ATTR(BPF_PROG_LOAD
))
987 if (attr
->prog_flags
& ~BPF_F_STRICT_ALIGNMENT
)
990 /* copy eBPF program license from user space */
991 if (strncpy_from_user(license
, u64_to_user_ptr(attr
->license
),
992 sizeof(license
) - 1) < 0)
994 license
[sizeof(license
) - 1] = 0;
996 /* eBPF programs must be GPL compatible to use GPL-ed functions */
997 is_gpl
= license_is_gpl_compatible(license
);
999 if (attr
->insn_cnt
== 0 || attr
->insn_cnt
> BPF_MAXINSNS
)
1002 if (type
== BPF_PROG_TYPE_KPROBE
&&
1003 attr
->kern_version
!= LINUX_VERSION_CODE
)
1006 if (type
!= BPF_PROG_TYPE_SOCKET_FILTER
&&
1007 type
!= BPF_PROG_TYPE_CGROUP_SKB
&&
1008 !capable(CAP_SYS_ADMIN
))
1011 /* plain bpf_prog allocation */
1012 prog
= bpf_prog_alloc(bpf_prog_size(attr
->insn_cnt
), GFP_USER
);
1016 err
= bpf_prog_charge_memlock(prog
);
1018 goto free_prog_nouncharge
;
1020 prog
->len
= attr
->insn_cnt
;
1023 if (copy_from_user(prog
->insns
, u64_to_user_ptr(attr
->insns
),
1024 bpf_prog_insn_size(prog
)) != 0)
1027 prog
->orig_prog
= NULL
;
1030 atomic_set(&prog
->aux
->refcnt
, 1);
1031 prog
->gpl_compatible
= is_gpl
? 1 : 0;
1033 /* find program type: socket_filter vs tracing_filter */
1034 err
= find_prog_type(type
, prog
);
1038 /* run eBPF verifier */
1039 err
= bpf_check(&prog
, attr
);
1041 goto free_used_maps
;
1043 /* eBPF program is ready to be JITed */
1044 prog
= bpf_prog_select_runtime(prog
, &err
);
1046 goto free_used_maps
;
1048 err
= bpf_prog_alloc_id(prog
);
1050 goto free_used_maps
;
1052 err
= bpf_prog_new_fd(prog
);
1054 /* failed to allocate fd.
1055 * bpf_prog_put() is needed because the above
1056 * bpf_prog_alloc_id() has published the prog
1057 * to the userspace and the userspace may
1058 * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID.
1064 bpf_prog_kallsyms_add(prog
);
1065 trace_bpf_prog_load(prog
, err
);
1069 free_used_maps(prog
->aux
);
1071 bpf_prog_uncharge_memlock(prog
);
1072 free_prog_nouncharge
:
1073 bpf_prog_free(prog
);
1077 #define BPF_OBJ_LAST_FIELD bpf_fd
1079 static int bpf_obj_pin(const union bpf_attr
*attr
)
1081 if (CHECK_ATTR(BPF_OBJ
))
1084 return bpf_obj_pin_user(attr
->bpf_fd
, u64_to_user_ptr(attr
->pathname
));
1087 static int bpf_obj_get(const union bpf_attr
*attr
)
1089 if (CHECK_ATTR(BPF_OBJ
) || attr
->bpf_fd
!= 0)
1092 return bpf_obj_get_user(u64_to_user_ptr(attr
->pathname
));
1095 #ifdef CONFIG_CGROUP_BPF
1097 #define BPF_PROG_ATTACH_LAST_FIELD attach_flags
1099 static int sockmap_get_from_fd(const union bpf_attr
*attr
, bool attach
)
1101 struct bpf_prog
*prog
= NULL
;
1102 int ufd
= attr
->target_fd
;
1103 struct bpf_map
*map
;
1108 map
= __bpf_map_get(f
);
1110 return PTR_ERR(map
);
1113 prog
= bpf_prog_get_type(attr
->attach_bpf_fd
,
1114 BPF_PROG_TYPE_SK_SKB
);
1117 return PTR_ERR(prog
);
1121 err
= sock_map_prog(map
, prog
, attr
->attach_type
);
1133 static int bpf_prog_attach(const union bpf_attr
*attr
)
1135 enum bpf_prog_type ptype
;
1136 struct bpf_prog
*prog
;
1137 struct cgroup
*cgrp
;
1140 if (!capable(CAP_NET_ADMIN
))
1143 if (CHECK_ATTR(BPF_PROG_ATTACH
))
1146 if (attr
->attach_flags
& ~BPF_F_ALLOW_OVERRIDE
)
1149 switch (attr
->attach_type
) {
1150 case BPF_CGROUP_INET_INGRESS
:
1151 case BPF_CGROUP_INET_EGRESS
:
1152 ptype
= BPF_PROG_TYPE_CGROUP_SKB
;
1154 case BPF_CGROUP_INET_SOCK_CREATE
:
1155 ptype
= BPF_PROG_TYPE_CGROUP_SOCK
;
1157 case BPF_CGROUP_SOCK_OPS
:
1158 ptype
= BPF_PROG_TYPE_SOCK_OPS
;
1160 case BPF_SK_SKB_STREAM_PARSER
:
1161 case BPF_SK_SKB_STREAM_VERDICT
:
1162 return sockmap_get_from_fd(attr
, true);
1167 prog
= bpf_prog_get_type(attr
->attach_bpf_fd
, ptype
);
1169 return PTR_ERR(prog
);
1171 cgrp
= cgroup_get_from_fd(attr
->target_fd
);
1174 return PTR_ERR(cgrp
);
1177 ret
= cgroup_bpf_update(cgrp
, prog
, attr
->attach_type
,
1178 attr
->attach_flags
& BPF_F_ALLOW_OVERRIDE
);
1186 #define BPF_PROG_DETACH_LAST_FIELD attach_type
1188 static int bpf_prog_detach(const union bpf_attr
*attr
)
1190 struct cgroup
*cgrp
;
1193 if (!capable(CAP_NET_ADMIN
))
1196 if (CHECK_ATTR(BPF_PROG_DETACH
))
1199 switch (attr
->attach_type
) {
1200 case BPF_CGROUP_INET_INGRESS
:
1201 case BPF_CGROUP_INET_EGRESS
:
1202 case BPF_CGROUP_INET_SOCK_CREATE
:
1203 case BPF_CGROUP_SOCK_OPS
:
1204 cgrp
= cgroup_get_from_fd(attr
->target_fd
);
1206 return PTR_ERR(cgrp
);
1208 ret
= cgroup_bpf_update(cgrp
, NULL
, attr
->attach_type
, false);
1211 case BPF_SK_SKB_STREAM_PARSER
:
1212 case BPF_SK_SKB_STREAM_VERDICT
:
1213 ret
= sockmap_get_from_fd(attr
, false);
1222 #endif /* CONFIG_CGROUP_BPF */
1224 #define BPF_PROG_TEST_RUN_LAST_FIELD test.duration
1226 static int bpf_prog_test_run(const union bpf_attr
*attr
,
1227 union bpf_attr __user
*uattr
)
1229 struct bpf_prog
*prog
;
1230 int ret
= -ENOTSUPP
;
1232 if (CHECK_ATTR(BPF_PROG_TEST_RUN
))
1235 prog
= bpf_prog_get(attr
->test
.prog_fd
);
1237 return PTR_ERR(prog
);
1239 if (prog
->aux
->ops
->test_run
)
1240 ret
= prog
->aux
->ops
->test_run(prog
, attr
, uattr
);
1246 #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
1248 static int bpf_obj_get_next_id(const union bpf_attr
*attr
,
1249 union bpf_attr __user
*uattr
,
1253 u32 next_id
= attr
->start_id
;
1256 if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID
) || next_id
>= INT_MAX
)
1259 if (!capable(CAP_SYS_ADMIN
))
1264 if (!idr_get_next(idr
, &next_id
))
1266 spin_unlock_bh(lock
);
1269 err
= put_user(next_id
, &uattr
->next_id
);
1274 #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
1276 static int bpf_prog_get_fd_by_id(const union bpf_attr
*attr
)
1278 struct bpf_prog
*prog
;
1279 u32 id
= attr
->prog_id
;
1282 if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID
))
1285 if (!capable(CAP_SYS_ADMIN
))
1288 spin_lock_bh(&prog_idr_lock
);
1289 prog
= idr_find(&prog_idr
, id
);
1291 prog
= bpf_prog_inc_not_zero(prog
);
1293 prog
= ERR_PTR(-ENOENT
);
1294 spin_unlock_bh(&prog_idr_lock
);
1297 return PTR_ERR(prog
);
1299 fd
= bpf_prog_new_fd(prog
);
1306 #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD map_id
1308 static int bpf_map_get_fd_by_id(const union bpf_attr
*attr
)
1310 struct bpf_map
*map
;
1311 u32 id
= attr
->map_id
;
1314 if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID
))
1317 if (!capable(CAP_SYS_ADMIN
))
1320 spin_lock_bh(&map_idr_lock
);
1321 map
= idr_find(&map_idr
, id
);
1323 map
= bpf_map_inc_not_zero(map
, true);
1325 map
= ERR_PTR(-ENOENT
);
1326 spin_unlock_bh(&map_idr_lock
);
1329 return PTR_ERR(map
);
1331 fd
= bpf_map_new_fd(map
);
1338 static int bpf_prog_get_info_by_fd(struct bpf_prog
*prog
,
1339 const union bpf_attr
*attr
,
1340 union bpf_attr __user
*uattr
)
1342 struct bpf_prog_info __user
*uinfo
= u64_to_user_ptr(attr
->info
.info
);
1343 struct bpf_prog_info info
= {};
1344 u32 info_len
= attr
->info
.info_len
;
1345 char __user
*uinsns
;
1349 err
= check_uarg_tail_zero(uinfo
, sizeof(info
), info_len
);
1352 info_len
= min_t(u32
, sizeof(info
), info_len
);
1354 if (copy_from_user(&info
, uinfo
, info_len
))
1357 info
.type
= prog
->type
;
1358 info
.id
= prog
->aux
->id
;
1360 memcpy(info
.tag
, prog
->tag
, sizeof(prog
->tag
));
1362 if (!capable(CAP_SYS_ADMIN
)) {
1363 info
.jited_prog_len
= 0;
1364 info
.xlated_prog_len
= 0;
1368 ulen
= info
.jited_prog_len
;
1369 info
.jited_prog_len
= prog
->jited_len
;
1370 if (info
.jited_prog_len
&& ulen
) {
1371 uinsns
= u64_to_user_ptr(info
.jited_prog_insns
);
1372 ulen
= min_t(u32
, info
.jited_prog_len
, ulen
);
1373 if (copy_to_user(uinsns
, prog
->bpf_func
, ulen
))
1377 ulen
= info
.xlated_prog_len
;
1378 info
.xlated_prog_len
= bpf_prog_insn_size(prog
);
1379 if (info
.xlated_prog_len
&& ulen
) {
1380 uinsns
= u64_to_user_ptr(info
.xlated_prog_insns
);
1381 ulen
= min_t(u32
, info
.xlated_prog_len
, ulen
);
1382 if (copy_to_user(uinsns
, prog
->insnsi
, ulen
))
1387 if (copy_to_user(uinfo
, &info
, info_len
) ||
1388 put_user(info_len
, &uattr
->info
.info_len
))
1394 static int bpf_map_get_info_by_fd(struct bpf_map
*map
,
1395 const union bpf_attr
*attr
,
1396 union bpf_attr __user
*uattr
)
1398 struct bpf_map_info __user
*uinfo
= u64_to_user_ptr(attr
->info
.info
);
1399 struct bpf_map_info info
= {};
1400 u32 info_len
= attr
->info
.info_len
;
1403 err
= check_uarg_tail_zero(uinfo
, sizeof(info
), info_len
);
1406 info_len
= min_t(u32
, sizeof(info
), info_len
);
1408 info
.type
= map
->map_type
;
1410 info
.key_size
= map
->key_size
;
1411 info
.value_size
= map
->value_size
;
1412 info
.max_entries
= map
->max_entries
;
1413 info
.map_flags
= map
->map_flags
;
1415 if (copy_to_user(uinfo
, &info
, info_len
) ||
1416 put_user(info_len
, &uattr
->info
.info_len
))
1422 #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
1424 static int bpf_obj_get_info_by_fd(const union bpf_attr
*attr
,
1425 union bpf_attr __user
*uattr
)
1427 int ufd
= attr
->info
.bpf_fd
;
1431 if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD
))
1438 if (f
.file
->f_op
== &bpf_prog_fops
)
1439 err
= bpf_prog_get_info_by_fd(f
.file
->private_data
, attr
,
1441 else if (f
.file
->f_op
== &bpf_map_fops
)
1442 err
= bpf_map_get_info_by_fd(f
.file
->private_data
, attr
,
1451 SYSCALL_DEFINE3(bpf
, int, cmd
, union bpf_attr __user
*, uattr
, unsigned int, size
)
1453 union bpf_attr attr
= {};
1456 if (!capable(CAP_SYS_ADMIN
) && sysctl_unprivileged_bpf_disabled
)
1459 err
= check_uarg_tail_zero(uattr
, sizeof(attr
), size
);
1462 size
= min_t(u32
, size
, sizeof(attr
));
1464 /* copy attributes from user space, may be less than sizeof(bpf_attr) */
1465 if (copy_from_user(&attr
, uattr
, size
) != 0)
1469 case BPF_MAP_CREATE
:
1470 err
= map_create(&attr
);
1472 case BPF_MAP_LOOKUP_ELEM
:
1473 err
= map_lookup_elem(&attr
);
1475 case BPF_MAP_UPDATE_ELEM
:
1476 err
= map_update_elem(&attr
);
1478 case BPF_MAP_DELETE_ELEM
:
1479 err
= map_delete_elem(&attr
);
1481 case BPF_MAP_GET_NEXT_KEY
:
1482 err
= map_get_next_key(&attr
);
1485 err
= bpf_prog_load(&attr
);
1488 err
= bpf_obj_pin(&attr
);
1491 err
= bpf_obj_get(&attr
);
1493 #ifdef CONFIG_CGROUP_BPF
1494 case BPF_PROG_ATTACH
:
1495 err
= bpf_prog_attach(&attr
);
1497 case BPF_PROG_DETACH
:
1498 err
= bpf_prog_detach(&attr
);
1501 case BPF_PROG_TEST_RUN
:
1502 err
= bpf_prog_test_run(&attr
, uattr
);
1504 case BPF_PROG_GET_NEXT_ID
:
1505 err
= bpf_obj_get_next_id(&attr
, uattr
,
1506 &prog_idr
, &prog_idr_lock
);
1508 case BPF_MAP_GET_NEXT_ID
:
1509 err
= bpf_obj_get_next_id(&attr
, uattr
,
1510 &map_idr
, &map_idr_lock
);
1512 case BPF_PROG_GET_FD_BY_ID
:
1513 err
= bpf_prog_get_fd_by_id(&attr
);
1515 case BPF_MAP_GET_FD_BY_ID
:
1516 err
= bpf_map_get_fd_by_id(&attr
);
1518 case BPF_OBJ_GET_INFO_BY_FD
:
1519 err
= bpf_obj_get_info_by_fd(&attr
, uattr
);