1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
7 #include <uapi/linux/bpf.h>
9 #include <linux/workqueue.h>
10 #include <linux/file.h>
11 #include <linux/percpu.h>
12 #include <linux/err.h>
13 #include <linux/rbtree_latch.h>
14 #include <linux/numa.h>
15 #include <linux/wait.h>
16 #include <linux/u64_stats_sync.h>
18 struct bpf_verifier_env
;
27 extern struct idr btf_idr
;
28 extern spinlock_t btf_idr_lock
;
30 /* map is generic key/value storage optionally accesible by eBPF programs */
32 /* funcs callable from userspace (via syscall) */
33 int (*map_alloc_check
)(union bpf_attr
*attr
);
34 struct bpf_map
*(*map_alloc
)(union bpf_attr
*attr
);
35 void (*map_release
)(struct bpf_map
*map
, struct file
*map_file
);
36 void (*map_free
)(struct bpf_map
*map
);
37 int (*map_get_next_key
)(struct bpf_map
*map
, void *key
, void *next_key
);
38 void (*map_release_uref
)(struct bpf_map
*map
);
39 void *(*map_lookup_elem_sys_only
)(struct bpf_map
*map
, void *key
);
41 /* funcs callable from userspace and from eBPF programs */
42 void *(*map_lookup_elem
)(struct bpf_map
*map
, void *key
);
43 int (*map_update_elem
)(struct bpf_map
*map
, void *key
, void *value
, u64 flags
);
44 int (*map_delete_elem
)(struct bpf_map
*map
, void *key
);
45 int (*map_push_elem
)(struct bpf_map
*map
, void *value
, u64 flags
);
46 int (*map_pop_elem
)(struct bpf_map
*map
, void *value
);
47 int (*map_peek_elem
)(struct bpf_map
*map
, void *value
);
49 /* funcs called by prog_array and perf_event_array map */
50 void *(*map_fd_get_ptr
)(struct bpf_map
*map
, struct file
*map_file
,
52 void (*map_fd_put_ptr
)(void *ptr
);
53 u32 (*map_gen_lookup
)(struct bpf_map
*map
, struct bpf_insn
*insn_buf
);
54 u32 (*map_fd_sys_lookup_elem
)(void *ptr
);
55 void (*map_seq_show_elem
)(struct bpf_map
*map
, void *key
,
57 int (*map_check_btf
)(const struct bpf_map
*map
,
58 const struct btf
*btf
,
59 const struct btf_type
*key_type
,
60 const struct btf_type
*value_type
);
62 /* Direct value access helpers. */
63 int (*map_direct_value_addr
)(const struct bpf_map
*map
,
65 int (*map_direct_value_meta
)(const struct bpf_map
*map
,
69 struct bpf_map_memory
{
71 struct user_struct
*user
;
75 /* The first two cachelines with read-mostly members of which some
76 * are also accessed in fast-path (e.g. ops, max_entries).
78 const struct bpf_map_ops
*ops ____cacheline_aligned
;
79 struct bpf_map
*inner_map_meta
;
80 #ifdef CONFIG_SECURITY
83 enum bpf_map_type map_type
;
88 int spin_lock_off
; /* >=0 valid offset, <0 error */
92 u32 btf_value_type_id
;
94 struct bpf_map_memory memory
;
96 bool frozen
; /* write-once */
99 /* The 3rd and 4th cacheline with misc members to avoid false sharing
100 * particularly with refcounting.
102 atomic_t refcnt ____cacheline_aligned
;
104 struct work_struct work
;
105 char name
[BPF_OBJ_NAME_LEN
];
108 static inline bool map_value_has_spin_lock(const struct bpf_map
*map
)
110 return map
->spin_lock_off
>= 0;
113 static inline void check_and_init_map_lock(struct bpf_map
*map
, void *dst
)
115 if (likely(!map_value_has_spin_lock(map
)))
117 *(struct bpf_spin_lock
*)(dst
+ map
->spin_lock_off
) =
118 (struct bpf_spin_lock
){};
121 /* copy everything but bpf_spin_lock */
122 static inline void copy_map_value(struct bpf_map
*map
, void *dst
, void *src
)
124 if (unlikely(map_value_has_spin_lock(map
))) {
125 u32 off
= map
->spin_lock_off
;
127 memcpy(dst
, src
, off
);
128 memcpy(dst
+ off
+ sizeof(struct bpf_spin_lock
),
129 src
+ off
+ sizeof(struct bpf_spin_lock
),
130 map
->value_size
- off
- sizeof(struct bpf_spin_lock
));
132 memcpy(dst
, src
, map
->value_size
);
135 void copy_map_value_locked(struct bpf_map
*map
, void *dst
, void *src
,
138 struct bpf_offload_dev
;
139 struct bpf_offloaded_map
;
141 struct bpf_map_dev_ops
{
142 int (*map_get_next_key
)(struct bpf_offloaded_map
*map
,
143 void *key
, void *next_key
);
144 int (*map_lookup_elem
)(struct bpf_offloaded_map
*map
,
145 void *key
, void *value
);
146 int (*map_update_elem
)(struct bpf_offloaded_map
*map
,
147 void *key
, void *value
, u64 flags
);
148 int (*map_delete_elem
)(struct bpf_offloaded_map
*map
, void *key
);
151 struct bpf_offloaded_map
{
153 struct net_device
*netdev
;
154 const struct bpf_map_dev_ops
*dev_ops
;
156 struct list_head offloads
;
159 static inline struct bpf_offloaded_map
*map_to_offmap(struct bpf_map
*map
)
161 return container_of(map
, struct bpf_offloaded_map
, map
);
164 static inline bool bpf_map_offload_neutral(const struct bpf_map
*map
)
166 return map
->map_type
== BPF_MAP_TYPE_PERF_EVENT_ARRAY
;
169 static inline bool bpf_map_support_seq_show(const struct bpf_map
*map
)
171 return map
->btf
&& map
->ops
->map_seq_show_elem
;
174 int map_check_no_btf(const struct bpf_map
*map
,
175 const struct btf
*btf
,
176 const struct btf_type
*key_type
,
177 const struct btf_type
*value_type
);
179 extern const struct bpf_map_ops bpf_map_offload_ops
;
181 /* function argument constraints */
183 ARG_DONTCARE
= 0, /* unused argument in helper function */
185 /* the following constraints used to prototype
186 * bpf_map_lookup/update/delete_elem() functions
188 ARG_CONST_MAP_PTR
, /* const argument used as pointer to bpf_map */
189 ARG_PTR_TO_MAP_KEY
, /* pointer to stack used as map key */
190 ARG_PTR_TO_MAP_VALUE
, /* pointer to stack used as map value */
191 ARG_PTR_TO_UNINIT_MAP_VALUE
, /* pointer to valid memory used to store a map value */
192 ARG_PTR_TO_MAP_VALUE_OR_NULL
, /* pointer to stack used as map value or NULL */
194 /* the following constraints used to prototype bpf_memcmp() and other
195 * functions that access data on eBPF program stack
197 ARG_PTR_TO_MEM
, /* pointer to valid memory (stack, packet, map value) */
198 ARG_PTR_TO_MEM_OR_NULL
, /* pointer to valid memory or NULL */
199 ARG_PTR_TO_UNINIT_MEM
, /* pointer to memory does not need to be initialized,
200 * helper function must fill all bytes or clear
201 * them in error case.
204 ARG_CONST_SIZE
, /* number of bytes accessed from memory */
205 ARG_CONST_SIZE_OR_ZERO
, /* number of bytes accessed from memory or 0 */
207 ARG_PTR_TO_CTX
, /* pointer to context */
208 ARG_ANYTHING
, /* any (initialized) argument is ok */
209 ARG_PTR_TO_SPIN_LOCK
, /* pointer to bpf_spin_lock */
210 ARG_PTR_TO_SOCK_COMMON
, /* pointer to sock_common */
211 ARG_PTR_TO_INT
, /* pointer to int */
212 ARG_PTR_TO_LONG
, /* pointer to long */
213 ARG_PTR_TO_SOCKET
, /* pointer to bpf_sock (fullsock) */
216 /* type of values returned from helper functions */
217 enum bpf_return_type
{
218 RET_INTEGER
, /* function returns integer */
219 RET_VOID
, /* function doesn't return anything */
220 RET_PTR_TO_MAP_VALUE
, /* returns a pointer to map elem value */
221 RET_PTR_TO_MAP_VALUE_OR_NULL
, /* returns a pointer to map elem value or NULL */
222 RET_PTR_TO_SOCKET_OR_NULL
, /* returns a pointer to a socket or NULL */
223 RET_PTR_TO_TCP_SOCK_OR_NULL
, /* returns a pointer to a tcp_sock or NULL */
224 RET_PTR_TO_SOCK_COMMON_OR_NULL
, /* returns a pointer to a sock_common or NULL */
227 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
228 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
229 * instructions after verifying
231 struct bpf_func_proto
{
232 u64 (*func
)(u64 r1
, u64 r2
, u64 r3
, u64 r4
, u64 r5
);
235 enum bpf_return_type ret_type
;
236 enum bpf_arg_type arg1_type
;
237 enum bpf_arg_type arg2_type
;
238 enum bpf_arg_type arg3_type
;
239 enum bpf_arg_type arg4_type
;
240 enum bpf_arg_type arg5_type
;
243 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
244 * the first argument to eBPF programs.
245 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
249 enum bpf_access_type
{
254 /* types of values stored in eBPF registers */
255 /* Pointer types represent:
258 * pointer + (u16) var
259 * pointer + (u16) var + imm
260 * if (range > 0) then [ptr, ptr + range - off) is safe to access
261 * if (id > 0) means that some 'var' was added
262 * if (off > 0) means that 'imm' was added
265 NOT_INIT
= 0, /* nothing was written into register */
266 SCALAR_VALUE
, /* reg doesn't contain a valid pointer */
267 PTR_TO_CTX
, /* reg points to bpf_context */
268 CONST_PTR_TO_MAP
, /* reg points to struct bpf_map */
269 PTR_TO_MAP_VALUE
, /* reg points to map element value */
270 PTR_TO_MAP_VALUE_OR_NULL
,/* points to map elem value or NULL */
271 PTR_TO_STACK
, /* reg == frame_pointer + offset */
272 PTR_TO_PACKET_META
, /* skb->data - meta_len */
273 PTR_TO_PACKET
, /* reg points to skb->data */
274 PTR_TO_PACKET_END
, /* skb->data + headlen */
275 PTR_TO_FLOW_KEYS
, /* reg points to bpf_flow_keys */
276 PTR_TO_SOCKET
, /* reg points to struct bpf_sock */
277 PTR_TO_SOCKET_OR_NULL
, /* reg points to struct bpf_sock or NULL */
278 PTR_TO_SOCK_COMMON
, /* reg points to sock_common */
279 PTR_TO_SOCK_COMMON_OR_NULL
, /* reg points to sock_common or NULL */
280 PTR_TO_TCP_SOCK
, /* reg points to struct tcp_sock */
281 PTR_TO_TCP_SOCK_OR_NULL
, /* reg points to struct tcp_sock or NULL */
282 PTR_TO_TP_BUFFER
, /* reg points to a writable raw tp's buffer */
283 PTR_TO_XDP_SOCK
, /* reg points to struct xdp_sock */
286 /* The information passed from prog-specific *_is_valid_access
287 * back to the verifier.
289 struct bpf_insn_access_aux
{
290 enum bpf_reg_type reg_type
;
295 bpf_ctx_record_field_size(struct bpf_insn_access_aux
*aux
, u32 size
)
297 aux
->ctx_field_size
= size
;
300 struct bpf_prog_ops
{
301 int (*test_run
)(struct bpf_prog
*prog
, const union bpf_attr
*kattr
,
302 union bpf_attr __user
*uattr
);
305 struct bpf_verifier_ops
{
306 /* return eBPF function prototype for verification */
307 const struct bpf_func_proto
*
308 (*get_func_proto
)(enum bpf_func_id func_id
,
309 const struct bpf_prog
*prog
);
311 /* return true if 'size' wide access at offset 'off' within bpf_context
312 * with 'type' (read or write) is allowed
314 bool (*is_valid_access
)(int off
, int size
, enum bpf_access_type type
,
315 const struct bpf_prog
*prog
,
316 struct bpf_insn_access_aux
*info
);
317 int (*gen_prologue
)(struct bpf_insn
*insn
, bool direct_write
,
318 const struct bpf_prog
*prog
);
319 int (*gen_ld_abs
)(const struct bpf_insn
*orig
,
320 struct bpf_insn
*insn_buf
);
321 u32 (*convert_ctx_access
)(enum bpf_access_type type
,
322 const struct bpf_insn
*src
,
323 struct bpf_insn
*dst
,
324 struct bpf_prog
*prog
, u32
*target_size
);
327 struct bpf_prog_offload_ops
{
328 /* verifier basic callbacks */
329 int (*insn_hook
)(struct bpf_verifier_env
*env
,
330 int insn_idx
, int prev_insn_idx
);
331 int (*finalize
)(struct bpf_verifier_env
*env
);
332 /* verifier optimization callbacks (called after .finalize) */
333 int (*replace_insn
)(struct bpf_verifier_env
*env
, u32 off
,
334 struct bpf_insn
*insn
);
335 int (*remove_insns
)(struct bpf_verifier_env
*env
, u32 off
, u32 cnt
);
336 /* program management callbacks */
337 int (*prepare
)(struct bpf_prog
*prog
);
338 int (*translate
)(struct bpf_prog
*prog
);
339 void (*destroy
)(struct bpf_prog
*prog
);
342 struct bpf_prog_offload
{
343 struct bpf_prog
*prog
;
344 struct net_device
*netdev
;
345 struct bpf_offload_dev
*offdev
;
347 struct list_head offloads
;
354 enum bpf_cgroup_storage_type
{
355 BPF_CGROUP_STORAGE_SHARED
,
356 BPF_CGROUP_STORAGE_PERCPU
,
357 __BPF_CGROUP_STORAGE_MAX
360 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
362 struct bpf_prog_stats
{
365 struct u64_stats_sync syncp
;
368 struct bpf_prog_aux
{
376 u32 func_cnt
; /* used by non-func prog as the number of func progs */
377 u32 func_idx
; /* 0 for non-func prog, the index in func array for func prog */
378 bool verifier_zext
; /* Zero extensions has been inserted by verifier. */
379 bool offload_requested
;
380 struct bpf_prog
**func
;
381 void *jit_data
; /* JIT specific data. arch dependent */
382 struct latch_tree_node ksym_tnode
;
383 struct list_head ksym_lnode
;
384 const struct bpf_prog_ops
*ops
;
385 struct bpf_map
**used_maps
;
386 struct bpf_prog
*prog
;
387 struct user_struct
*user
;
388 u64 load_time
; /* ns since boottime */
389 struct bpf_map
*cgroup_storage
[MAX_BPF_CGROUP_STORAGE_TYPE
];
390 char name
[BPF_OBJ_NAME_LEN
];
391 #ifdef CONFIG_SECURITY
394 struct bpf_prog_offload
*offload
;
396 struct bpf_func_info
*func_info
;
397 /* bpf_line_info loaded from userspace. linfo->insn_off
398 * has the xlated insn offset.
399 * Both the main and sub prog share the same linfo.
400 * The subprog can access its first linfo by
401 * using the linfo_idx.
403 struct bpf_line_info
*linfo
;
404 /* jited_linfo is the jited addr of the linfo. It has a
405 * one to one mapping to linfo:
406 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
407 * Both the main and sub prog share the same jited_linfo.
408 * The subprog can access its first jited_linfo by
409 * using the linfo_idx.
414 /* subprog can use linfo_idx to access its first linfo and
416 * main prog always has linfo_idx == 0
419 struct bpf_prog_stats __percpu
*stats
;
421 struct work_struct work
;
430 /* 'ownership' of prog_array is claimed by the first program that
431 * is going to use this map or by the first program which FD is stored
432 * in the map to make sure that all callers and callees have the same
433 * prog_type and JITed flag
435 enum bpf_prog_type owner_prog_type
;
438 char value
[0] __aligned(8);
439 void *ptrs
[0] __aligned(8);
440 void __percpu
*pptrs
[0] __aligned(8);
444 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
445 #define MAX_TAIL_CALL_CNT 32
447 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
448 BPF_F_RDONLY_PROG | \
452 #define BPF_MAP_CAN_READ BIT(0)
453 #define BPF_MAP_CAN_WRITE BIT(1)
455 static inline u32
bpf_map_flags_to_cap(struct bpf_map
*map
)
457 u32 access_flags
= map
->map_flags
& (BPF_F_RDONLY_PROG
| BPF_F_WRONLY_PROG
);
459 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
462 if (access_flags
& BPF_F_RDONLY_PROG
)
463 return BPF_MAP_CAN_READ
;
464 else if (access_flags
& BPF_F_WRONLY_PROG
)
465 return BPF_MAP_CAN_WRITE
;
467 return BPF_MAP_CAN_READ
| BPF_MAP_CAN_WRITE
;
470 static inline bool bpf_map_flags_access_ok(u32 access_flags
)
472 return (access_flags
& (BPF_F_RDONLY_PROG
| BPF_F_WRONLY_PROG
)) !=
473 (BPF_F_RDONLY_PROG
| BPF_F_WRONLY_PROG
);
476 struct bpf_event_entry
{
477 struct perf_event
*event
;
478 struct file
*perf_file
;
479 struct file
*map_file
;
483 bool bpf_prog_array_compatible(struct bpf_array
*array
, const struct bpf_prog
*fp
);
484 int bpf_prog_calc_tag(struct bpf_prog
*fp
);
486 const struct bpf_func_proto
*bpf_get_trace_printk_proto(void);
488 typedef unsigned long (*bpf_ctx_copy_t
)(void *dst
, const void *src
,
489 unsigned long off
, unsigned long len
);
490 typedef u32 (*bpf_convert_ctx_access_t
)(enum bpf_access_type type
,
491 const struct bpf_insn
*src
,
492 struct bpf_insn
*dst
,
493 struct bpf_prog
*prog
,
496 u64
bpf_event_output(struct bpf_map
*map
, u64 flags
, void *meta
, u64 meta_size
,
497 void *ctx
, u64 ctx_size
, bpf_ctx_copy_t ctx_copy
);
499 /* an array of programs to be executed under rcu_lock.
502 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
504 * the structure returned by bpf_prog_array_alloc() should be populated
505 * with program pointers and the last pointer must be NULL.
506 * The user has to keep refcnt on the program and make sure the program
507 * is removed from the array before bpf_prog_put().
508 * The 'struct bpf_prog_array *' should only be replaced with xchg()
509 * since other cpus are walking the array of pointers in parallel.
511 struct bpf_prog_array_item
{
512 struct bpf_prog
*prog
;
513 struct bpf_cgroup_storage
*cgroup_storage
[MAX_BPF_CGROUP_STORAGE_TYPE
];
516 struct bpf_prog_array
{
518 struct bpf_prog_array_item items
[0];
521 struct bpf_prog_array
*bpf_prog_array_alloc(u32 prog_cnt
, gfp_t flags
);
522 void bpf_prog_array_free(struct bpf_prog_array
*progs
);
523 int bpf_prog_array_length(struct bpf_prog_array
*progs
);
524 bool bpf_prog_array_is_empty(struct bpf_prog_array
*array
);
525 int bpf_prog_array_copy_to_user(struct bpf_prog_array
*progs
,
526 __u32 __user
*prog_ids
, u32 cnt
);
528 void bpf_prog_array_delete_safe(struct bpf_prog_array
*progs
,
529 struct bpf_prog
*old_prog
);
530 int bpf_prog_array_copy_info(struct bpf_prog_array
*array
,
531 u32
*prog_ids
, u32 request_cnt
,
533 int bpf_prog_array_copy(struct bpf_prog_array
*old_array
,
534 struct bpf_prog
*exclude_prog
,
535 struct bpf_prog
*include_prog
,
536 struct bpf_prog_array
**new_array
);
538 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null, set_cg_storage) \
540 struct bpf_prog_array_item *_item; \
541 struct bpf_prog *_prog; \
542 struct bpf_prog_array *_array; \
546 _array = rcu_dereference(array); \
547 if (unlikely(check_non_null && !_array))\
549 _item = &_array->items[0]; \
550 while ((_prog = READ_ONCE(_item->prog))) { \
551 if (set_cg_storage) \
552 bpf_cgroup_storage_set(_item->cgroup_storage); \
553 _ret &= func(_prog, ctx); \
562 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
563 * so BPF programs can request cwr for TCP packets.
565 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
566 * packet. This macro changes the behavior so the low order bit
567 * indicates whether the packet should be dropped (0) or not (1)
568 * and the next bit is a congestion notification bit. This could be
569 * used by TCP to call tcp_enter_cwr()
571 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
574 * 2: drop packet and cn
575 * 3: keep packet and cn
577 * This macro then converts it to one of the NET_XMIT or an error
578 * code that is then interpreted as drop packet (and no cn):
579 * 0: NET_XMIT_SUCCESS skb should be transmitted
580 * 1: NET_XMIT_DROP skb should be dropped and cn
581 * 2: NET_XMIT_CN skb should be transmitted and cn
582 * 3: -EPERM skb should be dropped
584 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
586 struct bpf_prog_array_item *_item; \
587 struct bpf_prog *_prog; \
588 struct bpf_prog_array *_array; \
594 _array = rcu_dereference(array); \
595 _item = &_array->items[0]; \
596 while ((_prog = READ_ONCE(_item->prog))) { \
597 bpf_cgroup_storage_set(_item->cgroup_storage); \
598 ret = func(_prog, ctx); \
606 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
608 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
612 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \
613 __BPF_PROG_RUN_ARRAY(array, ctx, func, false, true)
615 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
616 __BPF_PROG_RUN_ARRAY(array, ctx, func, true, false)
618 #ifdef CONFIG_BPF_SYSCALL
619 DECLARE_PER_CPU(int, bpf_prog_active
);
621 extern const struct file_operations bpf_map_fops
;
622 extern const struct file_operations bpf_prog_fops
;
624 #define BPF_PROG_TYPE(_id, _name) \
625 extern const struct bpf_prog_ops _name ## _prog_ops; \
626 extern const struct bpf_verifier_ops _name ## _verifier_ops;
627 #define BPF_MAP_TYPE(_id, _ops) \
628 extern const struct bpf_map_ops _ops;
629 #include <linux/bpf_types.h>
633 extern const struct bpf_prog_ops bpf_offload_prog_ops
;
634 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops
;
635 extern const struct bpf_verifier_ops xdp_analyzer_ops
;
637 struct bpf_prog
*bpf_prog_get(u32 ufd
);
638 struct bpf_prog
*bpf_prog_get_type_dev(u32 ufd
, enum bpf_prog_type type
,
640 struct bpf_prog
* __must_check
bpf_prog_add(struct bpf_prog
*prog
, int i
);
641 void bpf_prog_sub(struct bpf_prog
*prog
, int i
);
642 struct bpf_prog
* __must_check
bpf_prog_inc(struct bpf_prog
*prog
);
643 struct bpf_prog
* __must_check
bpf_prog_inc_not_zero(struct bpf_prog
*prog
);
644 void bpf_prog_put(struct bpf_prog
*prog
);
645 int __bpf_prog_charge(struct user_struct
*user
, u32 pages
);
646 void __bpf_prog_uncharge(struct user_struct
*user
, u32 pages
);
648 void bpf_prog_free_id(struct bpf_prog
*prog
, bool do_idr_lock
);
649 void bpf_map_free_id(struct bpf_map
*map
, bool do_idr_lock
);
651 struct bpf_map
*bpf_map_get_with_uref(u32 ufd
);
652 struct bpf_map
*__bpf_map_get(struct fd f
);
653 struct bpf_map
* __must_check
bpf_map_inc(struct bpf_map
*map
, bool uref
);
654 struct bpf_map
* __must_check
bpf_map_inc_not_zero(struct bpf_map
*map
,
656 void bpf_map_put_with_uref(struct bpf_map
*map
);
657 void bpf_map_put(struct bpf_map
*map
);
658 int bpf_map_charge_memlock(struct bpf_map
*map
, u32 pages
);
659 void bpf_map_uncharge_memlock(struct bpf_map
*map
, u32 pages
);
660 int bpf_map_charge_init(struct bpf_map_memory
*mem
, u64 size
);
661 void bpf_map_charge_finish(struct bpf_map_memory
*mem
);
662 void bpf_map_charge_move(struct bpf_map_memory
*dst
,
663 struct bpf_map_memory
*src
);
664 void *bpf_map_area_alloc(u64 size
, int numa_node
);
665 void bpf_map_area_free(void *base
);
666 void bpf_map_init_from_attr(struct bpf_map
*map
, union bpf_attr
*attr
);
668 extern int sysctl_unprivileged_bpf_disabled
;
670 int bpf_map_new_fd(struct bpf_map
*map
, int flags
);
671 int bpf_prog_new_fd(struct bpf_prog
*prog
);
673 int bpf_obj_pin_user(u32 ufd
, const char __user
*pathname
);
674 int bpf_obj_get_user(const char __user
*pathname
, int flags
);
676 int bpf_percpu_hash_copy(struct bpf_map
*map
, void *key
, void *value
);
677 int bpf_percpu_array_copy(struct bpf_map
*map
, void *key
, void *value
);
678 int bpf_percpu_hash_update(struct bpf_map
*map
, void *key
, void *value
,
680 int bpf_percpu_array_update(struct bpf_map
*map
, void *key
, void *value
,
683 int bpf_stackmap_copy(struct bpf_map
*map
, void *key
, void *value
);
685 int bpf_fd_array_map_update_elem(struct bpf_map
*map
, struct file
*map_file
,
686 void *key
, void *value
, u64 map_flags
);
687 int bpf_fd_array_map_lookup_elem(struct bpf_map
*map
, void *key
, u32
*value
);
688 int bpf_fd_htab_map_update_elem(struct bpf_map
*map
, struct file
*map_file
,
689 void *key
, void *value
, u64 map_flags
);
690 int bpf_fd_htab_map_lookup_elem(struct bpf_map
*map
, void *key
, u32
*value
);
692 int bpf_get_file_flag(int flags
);
693 int bpf_check_uarg_tail_zero(void __user
*uaddr
, size_t expected_size
,
696 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
697 * forced to use 'long' read/writes to try to atomically copy long counters.
698 * Best-effort only. No barriers here, since it _will_ race with concurrent
699 * updates from BPF programs. Called from bpf syscall and mostly used with
700 * size 8 or 16 bytes, so ask compiler to inline it.
702 static inline void bpf_long_memcpy(void *dst
, const void *src
, u32 size
)
704 const long *lsrc
= src
;
707 size
/= sizeof(long);
712 /* verify correctness of eBPF program */
713 int bpf_check(struct bpf_prog
**fp
, union bpf_attr
*attr
,
714 union bpf_attr __user
*uattr
);
716 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
717 void bpf_patch_call_args(struct bpf_insn
*insn
, u32 stack_depth
);
724 struct bpf_dtab_netdev
*__dev_map_lookup_elem(struct bpf_map
*map
, u32 key
);
725 struct bpf_dtab_netdev
*__dev_map_hash_lookup_elem(struct bpf_map
*map
, u32 key
);
726 void __dev_map_flush(struct bpf_map
*map
);
727 int dev_map_enqueue(struct bpf_dtab_netdev
*dst
, struct xdp_buff
*xdp
,
728 struct net_device
*dev_rx
);
729 int dev_map_generic_redirect(struct bpf_dtab_netdev
*dst
, struct sk_buff
*skb
,
730 struct bpf_prog
*xdp_prog
);
732 struct bpf_cpu_map_entry
*__cpu_map_lookup_elem(struct bpf_map
*map
, u32 key
);
733 void __cpu_map_flush(struct bpf_map
*map
);
734 int cpu_map_enqueue(struct bpf_cpu_map_entry
*rcpu
, struct xdp_buff
*xdp
,
735 struct net_device
*dev_rx
);
737 /* Return map's numa specified by userspace */
738 static inline int bpf_map_attr_numa_node(const union bpf_attr
*attr
)
740 return (attr
->map_flags
& BPF_F_NUMA_NODE
) ?
741 attr
->numa_node
: NUMA_NO_NODE
;
744 struct bpf_prog
*bpf_prog_get_type_path(const char *name
, enum bpf_prog_type type
);
745 int array_map_alloc_check(union bpf_attr
*attr
);
747 int bpf_prog_test_run_xdp(struct bpf_prog
*prog
, const union bpf_attr
*kattr
,
748 union bpf_attr __user
*uattr
);
749 int bpf_prog_test_run_skb(struct bpf_prog
*prog
, const union bpf_attr
*kattr
,
750 union bpf_attr __user
*uattr
);
751 int bpf_prog_test_run_flow_dissector(struct bpf_prog
*prog
,
752 const union bpf_attr
*kattr
,
753 union bpf_attr __user
*uattr
);
754 #else /* !CONFIG_BPF_SYSCALL */
755 static inline struct bpf_prog
*bpf_prog_get(u32 ufd
)
757 return ERR_PTR(-EOPNOTSUPP
);
760 static inline struct bpf_prog
*bpf_prog_get_type_dev(u32 ufd
,
761 enum bpf_prog_type type
,
764 return ERR_PTR(-EOPNOTSUPP
);
767 static inline struct bpf_prog
* __must_check
bpf_prog_add(struct bpf_prog
*prog
,
770 return ERR_PTR(-EOPNOTSUPP
);
773 static inline void bpf_prog_sub(struct bpf_prog
*prog
, int i
)
777 static inline void bpf_prog_put(struct bpf_prog
*prog
)
781 static inline struct bpf_prog
* __must_check
bpf_prog_inc(struct bpf_prog
*prog
)
783 return ERR_PTR(-EOPNOTSUPP
);
786 static inline struct bpf_prog
*__must_check
787 bpf_prog_inc_not_zero(struct bpf_prog
*prog
)
789 return ERR_PTR(-EOPNOTSUPP
);
792 static inline int __bpf_prog_charge(struct user_struct
*user
, u32 pages
)
797 static inline void __bpf_prog_uncharge(struct user_struct
*user
, u32 pages
)
801 static inline int bpf_obj_get_user(const char __user
*pathname
, int flags
)
806 static inline struct net_device
*__dev_map_lookup_elem(struct bpf_map
*map
,
812 static inline struct net_device
*__dev_map_hash_lookup_elem(struct bpf_map
*map
,
818 static inline void __dev_map_flush(struct bpf_map
*map
)
823 struct bpf_dtab_netdev
;
826 int dev_map_enqueue(struct bpf_dtab_netdev
*dst
, struct xdp_buff
*xdp
,
827 struct net_device
*dev_rx
)
834 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev
*dst
,
836 struct bpf_prog
*xdp_prog
)
842 struct bpf_cpu_map_entry
*__cpu_map_lookup_elem(struct bpf_map
*map
, u32 key
)
847 static inline void __cpu_map_flush(struct bpf_map
*map
)
851 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry
*rcpu
,
852 struct xdp_buff
*xdp
,
853 struct net_device
*dev_rx
)
858 static inline struct bpf_prog
*bpf_prog_get_type_path(const char *name
,
859 enum bpf_prog_type type
)
861 return ERR_PTR(-EOPNOTSUPP
);
864 static inline int bpf_prog_test_run_xdp(struct bpf_prog
*prog
,
865 const union bpf_attr
*kattr
,
866 union bpf_attr __user
*uattr
)
871 static inline int bpf_prog_test_run_skb(struct bpf_prog
*prog
,
872 const union bpf_attr
*kattr
,
873 union bpf_attr __user
*uattr
)
878 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog
*prog
,
879 const union bpf_attr
*kattr
,
880 union bpf_attr __user
*uattr
)
884 #endif /* CONFIG_BPF_SYSCALL */
886 static inline struct bpf_prog
*bpf_prog_get_type(u32 ufd
,
887 enum bpf_prog_type type
)
889 return bpf_prog_get_type_dev(ufd
, type
, false);
892 bool bpf_prog_get_ok(struct bpf_prog
*, enum bpf_prog_type
*, bool);
894 int bpf_prog_offload_compile(struct bpf_prog
*prog
);
895 void bpf_prog_offload_destroy(struct bpf_prog
*prog
);
896 int bpf_prog_offload_info_fill(struct bpf_prog_info
*info
,
897 struct bpf_prog
*prog
);
899 int bpf_map_offload_info_fill(struct bpf_map_info
*info
, struct bpf_map
*map
);
901 int bpf_map_offload_lookup_elem(struct bpf_map
*map
, void *key
, void *value
);
902 int bpf_map_offload_update_elem(struct bpf_map
*map
,
903 void *key
, void *value
, u64 flags
);
904 int bpf_map_offload_delete_elem(struct bpf_map
*map
, void *key
);
905 int bpf_map_offload_get_next_key(struct bpf_map
*map
,
906 void *key
, void *next_key
);
908 bool bpf_offload_prog_map_match(struct bpf_prog
*prog
, struct bpf_map
*map
);
910 struct bpf_offload_dev
*
911 bpf_offload_dev_create(const struct bpf_prog_offload_ops
*ops
, void *priv
);
912 void bpf_offload_dev_destroy(struct bpf_offload_dev
*offdev
);
913 void *bpf_offload_dev_priv(struct bpf_offload_dev
*offdev
);
914 int bpf_offload_dev_netdev_register(struct bpf_offload_dev
*offdev
,
915 struct net_device
*netdev
);
916 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev
*offdev
,
917 struct net_device
*netdev
);
918 bool bpf_offload_dev_match(struct bpf_prog
*prog
, struct net_device
*netdev
);
920 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
921 int bpf_prog_offload_init(struct bpf_prog
*prog
, union bpf_attr
*attr
);
923 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux
*aux
)
925 return aux
->offload_requested
;
928 static inline bool bpf_map_is_dev_bound(struct bpf_map
*map
)
930 return unlikely(map
->ops
== &bpf_map_offload_ops
);
933 struct bpf_map
*bpf_map_offload_map_alloc(union bpf_attr
*attr
);
934 void bpf_map_offload_map_free(struct bpf_map
*map
);
936 static inline int bpf_prog_offload_init(struct bpf_prog
*prog
,
937 union bpf_attr
*attr
)
942 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux
*aux
)
947 static inline bool bpf_map_is_dev_bound(struct bpf_map
*map
)
952 static inline struct bpf_map
*bpf_map_offload_map_alloc(union bpf_attr
*attr
)
954 return ERR_PTR(-EOPNOTSUPP
);
957 static inline void bpf_map_offload_map_free(struct bpf_map
*map
)
960 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
962 #if defined(CONFIG_BPF_STREAM_PARSER)
963 int sock_map_prog_update(struct bpf_map
*map
, struct bpf_prog
*prog
,
964 struct bpf_prog
*old
, u32 which
);
965 int sock_map_get_from_fd(const union bpf_attr
*attr
, struct bpf_prog
*prog
);
966 int sock_map_prog_detach(const union bpf_attr
*attr
, enum bpf_prog_type ptype
);
968 static inline int sock_map_prog_update(struct bpf_map
*map
,
969 struct bpf_prog
*prog
,
970 struct bpf_prog
*old
, u32 which
)
975 static inline int sock_map_get_from_fd(const union bpf_attr
*attr
,
976 struct bpf_prog
*prog
)
981 static inline int sock_map_prog_detach(const union bpf_attr
*attr
,
982 enum bpf_prog_type ptype
)
988 #if defined(CONFIG_XDP_SOCKETS)
990 struct xdp_sock
*__xsk_map_lookup_elem(struct bpf_map
*map
, u32 key
);
991 int __xsk_map_redirect(struct bpf_map
*map
, struct xdp_buff
*xdp
,
992 struct xdp_sock
*xs
);
993 void __xsk_map_flush(struct bpf_map
*map
);
996 static inline struct xdp_sock
*__xsk_map_lookup_elem(struct bpf_map
*map
,
1002 static inline int __xsk_map_redirect(struct bpf_map
*map
, struct xdp_buff
*xdp
,
1003 struct xdp_sock
*xs
)
1008 static inline void __xsk_map_flush(struct bpf_map
*map
)
1013 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
1014 void bpf_sk_reuseport_detach(struct sock
*sk
);
1015 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map
*map
, void *key
,
1017 int bpf_fd_reuseport_array_update_elem(struct bpf_map
*map
, void *key
,
1018 void *value
, u64 map_flags
);
1020 static inline void bpf_sk_reuseport_detach(struct sock
*sk
)
1024 #ifdef CONFIG_BPF_SYSCALL
1025 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map
*map
,
1026 void *key
, void *value
)
1031 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map
*map
,
1032 void *key
, void *value
,
1037 #endif /* CONFIG_BPF_SYSCALL */
1038 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
1040 /* verifier prototypes for helper functions called from eBPF programs */
1041 extern const struct bpf_func_proto bpf_map_lookup_elem_proto
;
1042 extern const struct bpf_func_proto bpf_map_update_elem_proto
;
1043 extern const struct bpf_func_proto bpf_map_delete_elem_proto
;
1044 extern const struct bpf_func_proto bpf_map_push_elem_proto
;
1045 extern const struct bpf_func_proto bpf_map_pop_elem_proto
;
1046 extern const struct bpf_func_proto bpf_map_peek_elem_proto
;
1048 extern const struct bpf_func_proto bpf_get_prandom_u32_proto
;
1049 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto
;
1050 extern const struct bpf_func_proto bpf_get_numa_node_id_proto
;
1051 extern const struct bpf_func_proto bpf_tail_call_proto
;
1052 extern const struct bpf_func_proto bpf_ktime_get_ns_proto
;
1053 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto
;
1054 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto
;
1055 extern const struct bpf_func_proto bpf_get_current_comm_proto
;
1056 extern const struct bpf_func_proto bpf_get_stackid_proto
;
1057 extern const struct bpf_func_proto bpf_get_stack_proto
;
1058 extern const struct bpf_func_proto bpf_sock_map_update_proto
;
1059 extern const struct bpf_func_proto bpf_sock_hash_update_proto
;
1060 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto
;
1061 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto
;
1062 extern const struct bpf_func_proto bpf_msg_redirect_map_proto
;
1063 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto
;
1064 extern const struct bpf_func_proto bpf_sk_redirect_map_proto
;
1065 extern const struct bpf_func_proto bpf_spin_lock_proto
;
1066 extern const struct bpf_func_proto bpf_spin_unlock_proto
;
1067 extern const struct bpf_func_proto bpf_get_local_storage_proto
;
1068 extern const struct bpf_func_proto bpf_strtol_proto
;
1069 extern const struct bpf_func_proto bpf_strtoul_proto
;
1070 extern const struct bpf_func_proto bpf_tcp_sock_proto
;
1072 /* Shared helpers among cBPF and eBPF. */
1073 void bpf_user_rnd_init_once(void);
1074 u64
bpf_user_rnd_u32(u64 r1
, u64 r2
, u64 r3
, u64 r4
, u64 r5
);
1076 #if defined(CONFIG_NET)
1077 bool bpf_sock_common_is_valid_access(int off
, int size
,
1078 enum bpf_access_type type
,
1079 struct bpf_insn_access_aux
*info
);
1080 bool bpf_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
1081 struct bpf_insn_access_aux
*info
);
1082 u32
bpf_sock_convert_ctx_access(enum bpf_access_type type
,
1083 const struct bpf_insn
*si
,
1084 struct bpf_insn
*insn_buf
,
1085 struct bpf_prog
*prog
,
1088 static inline bool bpf_sock_common_is_valid_access(int off
, int size
,
1089 enum bpf_access_type type
,
1090 struct bpf_insn_access_aux
*info
)
1094 static inline bool bpf_sock_is_valid_access(int off
, int size
,
1095 enum bpf_access_type type
,
1096 struct bpf_insn_access_aux
*info
)
1100 static inline u32
bpf_sock_convert_ctx_access(enum bpf_access_type type
,
1101 const struct bpf_insn
*si
,
1102 struct bpf_insn
*insn_buf
,
1103 struct bpf_prog
*prog
,
1111 bool bpf_tcp_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
1112 struct bpf_insn_access_aux
*info
);
1114 u32
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type
,
1115 const struct bpf_insn
*si
,
1116 struct bpf_insn
*insn_buf
,
1117 struct bpf_prog
*prog
,
1120 bool bpf_xdp_sock_is_valid_access(int off
, int size
, enum bpf_access_type type
,
1121 struct bpf_insn_access_aux
*info
);
1123 u32
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type
,
1124 const struct bpf_insn
*si
,
1125 struct bpf_insn
*insn_buf
,
1126 struct bpf_prog
*prog
,
1129 static inline bool bpf_tcp_sock_is_valid_access(int off
, int size
,
1130 enum bpf_access_type type
,
1131 struct bpf_insn_access_aux
*info
)
1136 static inline u32
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type
,
1137 const struct bpf_insn
*si
,
1138 struct bpf_insn
*insn_buf
,
1139 struct bpf_prog
*prog
,
1144 static inline bool bpf_xdp_sock_is_valid_access(int off
, int size
,
1145 enum bpf_access_type type
,
1146 struct bpf_insn_access_aux
*info
)
1151 static inline u32
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type
,
1152 const struct bpf_insn
*si
,
1153 struct bpf_insn
*insn_buf
,
1154 struct bpf_prog
*prog
,
1159 #endif /* CONFIG_INET */
1161 #endif /* _LINUX_BPF_H */