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/syscalls.h>
14 #include <linux/slab.h>
15 #include <linux/anon_inodes.h>
16 #include <linux/file.h>
17 #include <linux/license.h>
18 #include <linux/filter.h>
19 #include <linux/version.h>
20 #include <linux/kernel.h>
22 DEFINE_PER_CPU(int, bpf_prog_active
);
24 int sysctl_unprivileged_bpf_disabled __read_mostly
;
26 static LIST_HEAD(bpf_map_types
);
28 static struct bpf_map
*find_and_alloc_map(union bpf_attr
*attr
)
30 struct bpf_map_type_list
*tl
;
33 list_for_each_entry(tl
, &bpf_map_types
, list_node
) {
34 if (tl
->type
== attr
->map_type
) {
35 map
= tl
->ops
->map_alloc(attr
);
39 map
->map_type
= attr
->map_type
;
43 return ERR_PTR(-EINVAL
);
46 /* boot time registration of different map implementations */
47 void bpf_register_map_type(struct bpf_map_type_list
*tl
)
49 list_add(&tl
->list_node
, &bpf_map_types
);
52 int bpf_map_precharge_memlock(u32 pages
)
54 struct user_struct
*user
= get_current_user();
55 unsigned long memlock_limit
, cur
;
57 memlock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
58 cur
= atomic_long_read(&user
->locked_vm
);
60 if (cur
+ pages
> memlock_limit
)
65 static int bpf_map_charge_memlock(struct bpf_map
*map
)
67 struct user_struct
*user
= get_current_user();
68 unsigned long memlock_limit
;
70 memlock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
72 atomic_long_add(map
->pages
, &user
->locked_vm
);
74 if (atomic_long_read(&user
->locked_vm
) > memlock_limit
) {
75 atomic_long_sub(map
->pages
, &user
->locked_vm
);
83 static void bpf_map_uncharge_memlock(struct bpf_map
*map
)
85 struct user_struct
*user
= map
->user
;
87 atomic_long_sub(map
->pages
, &user
->locked_vm
);
91 /* called from workqueue */
92 static void bpf_map_free_deferred(struct work_struct
*work
)
94 struct bpf_map
*map
= container_of(work
, struct bpf_map
, work
);
96 bpf_map_uncharge_memlock(map
);
97 /* implementation dependent freeing */
98 map
->ops
->map_free(map
);
101 static void bpf_map_put_uref(struct bpf_map
*map
)
103 if (atomic_dec_and_test(&map
->usercnt
)) {
104 if (map
->map_type
== BPF_MAP_TYPE_PROG_ARRAY
)
105 bpf_fd_array_map_clear(map
);
109 /* decrement map refcnt and schedule it for freeing via workqueue
110 * (unrelying map implementation ops->map_free() might sleep)
112 void bpf_map_put(struct bpf_map
*map
)
114 if (atomic_dec_and_test(&map
->refcnt
)) {
115 INIT_WORK(&map
->work
, bpf_map_free_deferred
);
116 schedule_work(&map
->work
);
120 void bpf_map_put_with_uref(struct bpf_map
*map
)
122 bpf_map_put_uref(map
);
126 static int bpf_map_release(struct inode
*inode
, struct file
*filp
)
128 struct bpf_map
*map
= filp
->private_data
;
130 if (map
->ops
->map_release
)
131 map
->ops
->map_release(map
, filp
);
133 bpf_map_put_with_uref(map
);
137 #ifdef CONFIG_PROC_FS
138 static void bpf_map_show_fdinfo(struct seq_file
*m
, struct file
*filp
)
140 const struct bpf_map
*map
= filp
->private_data
;
141 const struct bpf_array
*array
;
142 u32 owner_prog_type
= 0;
144 if (map
->map_type
== BPF_MAP_TYPE_PROG_ARRAY
) {
145 array
= container_of(map
, struct bpf_array
, map
);
146 owner_prog_type
= array
->owner_prog_type
;
161 map
->pages
* 1ULL << PAGE_SHIFT
);
164 seq_printf(m
, "owner_prog_type:\t%u\n",
169 static const struct file_operations bpf_map_fops
= {
170 #ifdef CONFIG_PROC_FS
171 .show_fdinfo
= bpf_map_show_fdinfo
,
173 .release
= bpf_map_release
,
176 int bpf_map_new_fd(struct bpf_map
*map
)
178 return anon_inode_getfd("bpf-map", &bpf_map_fops
, map
,
182 /* helper macro to check that unused fields 'union bpf_attr' are zero */
183 #define CHECK_ATTR(CMD) \
184 memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
185 sizeof(attr->CMD##_LAST_FIELD), 0, \
187 offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
188 sizeof(attr->CMD##_LAST_FIELD)) != NULL
190 #define BPF_MAP_CREATE_LAST_FIELD map_flags
191 /* called via syscall */
192 static int map_create(union bpf_attr
*attr
)
197 err
= CHECK_ATTR(BPF_MAP_CREATE
);
201 /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
202 map
= find_and_alloc_map(attr
);
206 atomic_set(&map
->refcnt
, 1);
207 atomic_set(&map
->usercnt
, 1);
209 err
= bpf_map_charge_memlock(map
);
211 goto free_map_nouncharge
;
213 err
= bpf_map_new_fd(map
);
215 /* failed to allocate fd */
221 bpf_map_uncharge_memlock(map
);
223 map
->ops
->map_free(map
);
227 /* if error is returned, fd is released.
228 * On success caller should complete fd access with matching fdput()
230 struct bpf_map
*__bpf_map_get(struct fd f
)
233 return ERR_PTR(-EBADF
);
234 if (f
.file
->f_op
!= &bpf_map_fops
) {
236 return ERR_PTR(-EINVAL
);
239 return f
.file
->private_data
;
242 /* prog's and map's refcnt limit */
243 #define BPF_MAX_REFCNT 32768
245 struct bpf_map
*bpf_map_inc(struct bpf_map
*map
, bool uref
)
247 if (atomic_inc_return(&map
->refcnt
) > BPF_MAX_REFCNT
) {
248 atomic_dec(&map
->refcnt
);
249 return ERR_PTR(-EBUSY
);
252 atomic_inc(&map
->usercnt
);
256 struct bpf_map
*bpf_map_get_with_uref(u32 ufd
)
258 struct fd f
= fdget(ufd
);
261 map
= __bpf_map_get(f
);
265 map
= bpf_map_inc(map
, true);
271 int __weak
bpf_stackmap_copy(struct bpf_map
*map
, void *key
, void *value
)
276 /* last field in 'union bpf_attr' used by this command */
277 #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value
279 static int map_lookup_elem(union bpf_attr
*attr
)
281 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
282 void __user
*uvalue
= u64_to_user_ptr(attr
->value
);
283 int ufd
= attr
->map_fd
;
285 void *key
, *value
, *ptr
;
290 if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM
))
294 map
= __bpf_map_get(f
);
299 key
= kmalloc(map
->key_size
, GFP_USER
);
304 if (copy_from_user(key
, ukey
, map
->key_size
) != 0)
307 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
308 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
||
309 map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
)
310 value_size
= round_up(map
->value_size
, 8) * num_possible_cpus();
312 value_size
= map
->value_size
;
315 value
= kmalloc(value_size
, GFP_USER
| __GFP_NOWARN
);
319 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
320 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
) {
321 err
= bpf_percpu_hash_copy(map
, key
, value
);
322 } else if (map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
) {
323 err
= bpf_percpu_array_copy(map
, key
, value
);
324 } else if (map
->map_type
== BPF_MAP_TYPE_STACK_TRACE
) {
325 err
= bpf_stackmap_copy(map
, key
, value
);
328 ptr
= map
->ops
->map_lookup_elem(map
, key
);
330 memcpy(value
, ptr
, value_size
);
332 err
= ptr
? 0 : -ENOENT
;
339 if (copy_to_user(uvalue
, value
, value_size
) != 0)
353 #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
355 static int map_update_elem(union bpf_attr
*attr
)
357 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
358 void __user
*uvalue
= u64_to_user_ptr(attr
->value
);
359 int ufd
= attr
->map_fd
;
366 if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM
))
370 map
= __bpf_map_get(f
);
375 key
= kmalloc(map
->key_size
, GFP_USER
);
380 if (copy_from_user(key
, ukey
, map
->key_size
) != 0)
383 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
384 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
||
385 map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
)
386 value_size
= round_up(map
->value_size
, 8) * num_possible_cpus();
388 value_size
= map
->value_size
;
391 value
= kmalloc(value_size
, GFP_USER
| __GFP_NOWARN
);
396 if (copy_from_user(value
, uvalue
, value_size
) != 0)
399 /* must increment bpf_prog_active to avoid kprobe+bpf triggering from
400 * inside bpf map update or delete otherwise deadlocks are possible
403 __this_cpu_inc(bpf_prog_active
);
404 if (map
->map_type
== BPF_MAP_TYPE_PERCPU_HASH
||
405 map
->map_type
== BPF_MAP_TYPE_LRU_PERCPU_HASH
) {
406 err
= bpf_percpu_hash_update(map
, key
, value
, attr
->flags
);
407 } else if (map
->map_type
== BPF_MAP_TYPE_PERCPU_ARRAY
) {
408 err
= bpf_percpu_array_update(map
, key
, value
, attr
->flags
);
409 } else if (map
->map_type
== BPF_MAP_TYPE_PERF_EVENT_ARRAY
||
410 map
->map_type
== BPF_MAP_TYPE_PROG_ARRAY
||
411 map
->map_type
== BPF_MAP_TYPE_CGROUP_ARRAY
) {
413 err
= bpf_fd_array_map_update_elem(map
, f
.file
, key
, value
,
418 err
= map
->ops
->map_update_elem(map
, key
, value
, attr
->flags
);
421 __this_cpu_dec(bpf_prog_active
);
433 #define BPF_MAP_DELETE_ELEM_LAST_FIELD key
435 static int map_delete_elem(union bpf_attr
*attr
)
437 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
438 int ufd
= attr
->map_fd
;
444 if (CHECK_ATTR(BPF_MAP_DELETE_ELEM
))
448 map
= __bpf_map_get(f
);
453 key
= kmalloc(map
->key_size
, GFP_USER
);
458 if (copy_from_user(key
, ukey
, map
->key_size
) != 0)
462 __this_cpu_inc(bpf_prog_active
);
464 err
= map
->ops
->map_delete_elem(map
, key
);
466 __this_cpu_dec(bpf_prog_active
);
476 /* last field in 'union bpf_attr' used by this command */
477 #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
479 static int map_get_next_key(union bpf_attr
*attr
)
481 void __user
*ukey
= u64_to_user_ptr(attr
->key
);
482 void __user
*unext_key
= u64_to_user_ptr(attr
->next_key
);
483 int ufd
= attr
->map_fd
;
485 void *key
, *next_key
;
489 if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY
))
493 map
= __bpf_map_get(f
);
498 key
= kmalloc(map
->key_size
, GFP_USER
);
503 if (copy_from_user(key
, ukey
, map
->key_size
) != 0)
507 next_key
= kmalloc(map
->key_size
, GFP_USER
);
512 err
= map
->ops
->map_get_next_key(map
, key
, next_key
);
518 if (copy_to_user(unext_key
, next_key
, map
->key_size
) != 0)
532 static LIST_HEAD(bpf_prog_types
);
534 static int find_prog_type(enum bpf_prog_type type
, struct bpf_prog
*prog
)
536 struct bpf_prog_type_list
*tl
;
538 list_for_each_entry(tl
, &bpf_prog_types
, list_node
) {
539 if (tl
->type
== type
) {
540 prog
->aux
->ops
= tl
->ops
;
549 void bpf_register_prog_type(struct bpf_prog_type_list
*tl
)
551 list_add(&tl
->list_node
, &bpf_prog_types
);
554 /* fixup insn->imm field of bpf_call instructions:
555 * if (insn->imm == BPF_FUNC_map_lookup_elem)
556 * insn->imm = bpf_map_lookup_elem - __bpf_call_base;
557 * else if (insn->imm == BPF_FUNC_map_update_elem)
558 * insn->imm = bpf_map_update_elem - __bpf_call_base;
561 * this function is called after eBPF program passed verification
563 static void fixup_bpf_calls(struct bpf_prog
*prog
)
565 const struct bpf_func_proto
*fn
;
568 for (i
= 0; i
< prog
->len
; i
++) {
569 struct bpf_insn
*insn
= &prog
->insnsi
[i
];
571 if (insn
->code
== (BPF_JMP
| BPF_CALL
)) {
572 /* we reach here when program has bpf_call instructions
573 * and it passed bpf_check(), means that
574 * ops->get_func_proto must have been supplied, check it
576 BUG_ON(!prog
->aux
->ops
->get_func_proto
);
578 if (insn
->imm
== BPF_FUNC_get_route_realm
)
579 prog
->dst_needed
= 1;
580 if (insn
->imm
== BPF_FUNC_get_prandom_u32
)
581 bpf_user_rnd_init_once();
582 if (insn
->imm
== BPF_FUNC_xdp_adjust_head
)
583 prog
->xdp_adjust_head
= 1;
584 if (insn
->imm
== BPF_FUNC_tail_call
) {
585 /* mark bpf_tail_call as different opcode
586 * to avoid conditional branch in
587 * interpeter for every normal call
588 * and to prevent accidental JITing by
589 * JIT compiler that doesn't support
597 fn
= prog
->aux
->ops
->get_func_proto(insn
->imm
);
598 /* all functions that have prototype and verifier allowed
599 * programs to call them, must be real in-kernel functions
602 insn
->imm
= fn
->func
- __bpf_call_base
;
607 /* drop refcnt on maps used by eBPF program and free auxilary data */
608 static void free_used_maps(struct bpf_prog_aux
*aux
)
612 for (i
= 0; i
< aux
->used_map_cnt
; i
++)
613 bpf_map_put(aux
->used_maps
[i
]);
615 kfree(aux
->used_maps
);
618 static int bpf_prog_charge_memlock(struct bpf_prog
*prog
)
620 struct user_struct
*user
= get_current_user();
621 unsigned long memlock_limit
;
623 memlock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
625 atomic_long_add(prog
->pages
, &user
->locked_vm
);
626 if (atomic_long_read(&user
->locked_vm
) > memlock_limit
) {
627 atomic_long_sub(prog
->pages
, &user
->locked_vm
);
631 prog
->aux
->user
= user
;
635 static void bpf_prog_uncharge_memlock(struct bpf_prog
*prog
)
637 struct user_struct
*user
= prog
->aux
->user
;
639 atomic_long_sub(prog
->pages
, &user
->locked_vm
);
643 static void __bpf_prog_put_rcu(struct rcu_head
*rcu
)
645 struct bpf_prog_aux
*aux
= container_of(rcu
, struct bpf_prog_aux
, rcu
);
648 bpf_prog_uncharge_memlock(aux
->prog
);
649 bpf_prog_free(aux
->prog
);
652 void bpf_prog_put(struct bpf_prog
*prog
)
654 if (atomic_dec_and_test(&prog
->aux
->refcnt
))
655 call_rcu(&prog
->aux
->rcu
, __bpf_prog_put_rcu
);
657 EXPORT_SYMBOL_GPL(bpf_prog_put
);
659 static int bpf_prog_release(struct inode
*inode
, struct file
*filp
)
661 struct bpf_prog
*prog
= filp
->private_data
;
667 #ifdef CONFIG_PROC_FS
668 static void bpf_prog_show_fdinfo(struct seq_file
*m
, struct file
*filp
)
670 const struct bpf_prog
*prog
= filp
->private_data
;
671 char prog_digest
[sizeof(prog
->digest
) * 2 + 1] = { };
673 bin2hex(prog_digest
, prog
->digest
, sizeof(prog
->digest
));
682 prog
->pages
* 1ULL << PAGE_SHIFT
);
686 static const struct file_operations bpf_prog_fops
= {
687 #ifdef CONFIG_PROC_FS
688 .show_fdinfo
= bpf_prog_show_fdinfo
,
690 .release
= bpf_prog_release
,
693 int bpf_prog_new_fd(struct bpf_prog
*prog
)
695 return anon_inode_getfd("bpf-prog", &bpf_prog_fops
, prog
,
699 static struct bpf_prog
*____bpf_prog_get(struct fd f
)
702 return ERR_PTR(-EBADF
);
703 if (f
.file
->f_op
!= &bpf_prog_fops
) {
705 return ERR_PTR(-EINVAL
);
708 return f
.file
->private_data
;
711 struct bpf_prog
*bpf_prog_add(struct bpf_prog
*prog
, int i
)
713 if (atomic_add_return(i
, &prog
->aux
->refcnt
) > BPF_MAX_REFCNT
) {
714 atomic_sub(i
, &prog
->aux
->refcnt
);
715 return ERR_PTR(-EBUSY
);
719 EXPORT_SYMBOL_GPL(bpf_prog_add
);
721 void bpf_prog_sub(struct bpf_prog
*prog
, int i
)
723 /* Only to be used for undoing previous bpf_prog_add() in some
724 * error path. We still know that another entity in our call
725 * path holds a reference to the program, thus atomic_sub() can
726 * be safely used in such cases!
728 WARN_ON(atomic_sub_return(i
, &prog
->aux
->refcnt
) == 0);
730 EXPORT_SYMBOL_GPL(bpf_prog_sub
);
732 struct bpf_prog
*bpf_prog_inc(struct bpf_prog
*prog
)
734 return bpf_prog_add(prog
, 1);
736 EXPORT_SYMBOL_GPL(bpf_prog_inc
);
738 static struct bpf_prog
*__bpf_prog_get(u32 ufd
, enum bpf_prog_type
*type
)
740 struct fd f
= fdget(ufd
);
741 struct bpf_prog
*prog
;
743 prog
= ____bpf_prog_get(f
);
746 if (type
&& prog
->type
!= *type
) {
747 prog
= ERR_PTR(-EINVAL
);
751 prog
= bpf_prog_inc(prog
);
757 struct bpf_prog
*bpf_prog_get(u32 ufd
)
759 return __bpf_prog_get(ufd
, NULL
);
762 struct bpf_prog
*bpf_prog_get_type(u32 ufd
, enum bpf_prog_type type
)
764 return __bpf_prog_get(ufd
, &type
);
766 EXPORT_SYMBOL_GPL(bpf_prog_get_type
);
768 /* last field in 'union bpf_attr' used by this command */
769 #define BPF_PROG_LOAD_LAST_FIELD kern_version
771 static int bpf_prog_load(union bpf_attr
*attr
)
773 enum bpf_prog_type type
= attr
->prog_type
;
774 struct bpf_prog
*prog
;
779 if (CHECK_ATTR(BPF_PROG_LOAD
))
782 /* copy eBPF program license from user space */
783 if (strncpy_from_user(license
, u64_to_user_ptr(attr
->license
),
784 sizeof(license
) - 1) < 0)
786 license
[sizeof(license
) - 1] = 0;
788 /* eBPF programs must be GPL compatible to use GPL-ed functions */
789 is_gpl
= license_is_gpl_compatible(license
);
791 if (attr
->insn_cnt
== 0 || attr
->insn_cnt
> BPF_MAXINSNS
)
794 if (type
== BPF_PROG_TYPE_KPROBE
&&
795 attr
->kern_version
!= LINUX_VERSION_CODE
)
798 if (type
!= BPF_PROG_TYPE_SOCKET_FILTER
&& !capable(CAP_SYS_ADMIN
))
801 /* plain bpf_prog allocation */
802 prog
= bpf_prog_alloc(bpf_prog_size(attr
->insn_cnt
), GFP_USER
);
806 err
= bpf_prog_charge_memlock(prog
);
808 goto free_prog_nouncharge
;
810 prog
->len
= attr
->insn_cnt
;
813 if (copy_from_user(prog
->insns
, u64_to_user_ptr(attr
->insns
),
814 prog
->len
* sizeof(struct bpf_insn
)) != 0)
817 prog
->orig_prog
= NULL
;
820 atomic_set(&prog
->aux
->refcnt
, 1);
821 prog
->gpl_compatible
= is_gpl
? 1 : 0;
823 /* find program type: socket_filter vs tracing_filter */
824 err
= find_prog_type(type
, prog
);
828 /* run eBPF verifier */
829 err
= bpf_check(&prog
, attr
);
833 /* fixup BPF_CALL->imm field */
834 fixup_bpf_calls(prog
);
836 /* eBPF program is ready to be JITed */
837 prog
= bpf_prog_select_runtime(prog
, &err
);
841 err
= bpf_prog_new_fd(prog
);
843 /* failed to allocate fd */
849 free_used_maps(prog
->aux
);
851 bpf_prog_uncharge_memlock(prog
);
852 free_prog_nouncharge
:
857 #define BPF_OBJ_LAST_FIELD bpf_fd
859 static int bpf_obj_pin(const union bpf_attr
*attr
)
861 if (CHECK_ATTR(BPF_OBJ
))
864 return bpf_obj_pin_user(attr
->bpf_fd
, u64_to_user_ptr(attr
->pathname
));
867 static int bpf_obj_get(const union bpf_attr
*attr
)
869 if (CHECK_ATTR(BPF_OBJ
) || attr
->bpf_fd
!= 0)
872 return bpf_obj_get_user(u64_to_user_ptr(attr
->pathname
));
875 #ifdef CONFIG_CGROUP_BPF
877 #define BPF_PROG_ATTACH_LAST_FIELD attach_type
879 static int bpf_prog_attach(const union bpf_attr
*attr
)
881 struct bpf_prog
*prog
;
883 enum bpf_prog_type ptype
;
885 if (!capable(CAP_NET_ADMIN
))
888 if (CHECK_ATTR(BPF_PROG_ATTACH
))
891 switch (attr
->attach_type
) {
892 case BPF_CGROUP_INET_INGRESS
:
893 case BPF_CGROUP_INET_EGRESS
:
894 ptype
= BPF_PROG_TYPE_CGROUP_SKB
;
896 case BPF_CGROUP_INET_SOCK_CREATE
:
897 ptype
= BPF_PROG_TYPE_CGROUP_SOCK
;
903 prog
= bpf_prog_get_type(attr
->attach_bpf_fd
, ptype
);
905 return PTR_ERR(prog
);
907 cgrp
= cgroup_get_from_fd(attr
->target_fd
);
910 return PTR_ERR(cgrp
);
913 cgroup_bpf_update(cgrp
, prog
, attr
->attach_type
);
919 #define BPF_PROG_DETACH_LAST_FIELD attach_type
921 static int bpf_prog_detach(const union bpf_attr
*attr
)
925 if (!capable(CAP_NET_ADMIN
))
928 if (CHECK_ATTR(BPF_PROG_DETACH
))
931 switch (attr
->attach_type
) {
932 case BPF_CGROUP_INET_INGRESS
:
933 case BPF_CGROUP_INET_EGRESS
:
934 case BPF_CGROUP_INET_SOCK_CREATE
:
935 cgrp
= cgroup_get_from_fd(attr
->target_fd
);
937 return PTR_ERR(cgrp
);
939 cgroup_bpf_update(cgrp
, NULL
, attr
->attach_type
);
949 #endif /* CONFIG_CGROUP_BPF */
951 SYSCALL_DEFINE3(bpf
, int, cmd
, union bpf_attr __user
*, uattr
, unsigned int, size
)
953 union bpf_attr attr
= {};
956 if (!capable(CAP_SYS_ADMIN
) && sysctl_unprivileged_bpf_disabled
)
959 if (!access_ok(VERIFY_READ
, uattr
, 1))
962 if (size
> PAGE_SIZE
) /* silly large */
965 /* If we're handed a bigger struct than we know of,
966 * ensure all the unknown bits are 0 - i.e. new
967 * user-space does not rely on any kernel feature
968 * extensions we dont know about yet.
970 if (size
> sizeof(attr
)) {
971 unsigned char __user
*addr
;
972 unsigned char __user
*end
;
975 addr
= (void __user
*)uattr
+ sizeof(attr
);
976 end
= (void __user
*)uattr
+ size
;
978 for (; addr
< end
; addr
++) {
979 err
= get_user(val
, addr
);
988 /* copy attributes from user space, may be less than sizeof(bpf_attr) */
989 if (copy_from_user(&attr
, uattr
, size
) != 0)
994 err
= map_create(&attr
);
996 case BPF_MAP_LOOKUP_ELEM
:
997 err
= map_lookup_elem(&attr
);
999 case BPF_MAP_UPDATE_ELEM
:
1000 err
= map_update_elem(&attr
);
1002 case BPF_MAP_DELETE_ELEM
:
1003 err
= map_delete_elem(&attr
);
1005 case BPF_MAP_GET_NEXT_KEY
:
1006 err
= map_get_next_key(&attr
);
1009 err
= bpf_prog_load(&attr
);
1012 err
= bpf_obj_pin(&attr
);
1015 err
= bpf_obj_get(&attr
);
1018 #ifdef CONFIG_CGROUP_BPF
1019 case BPF_PROG_ATTACH
:
1020 err
= bpf_prog_attach(&attr
);
1022 case BPF_PROG_DETACH
:
1023 err
= bpf_prog_detach(&attr
);