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/mm_types.h>
16 #include <linux/wait.h>
17 #include <linux/refcount.h>
18 #include <linux/mutex.h>
19 #include <linux/module.h>
20 #include <linux/kallsyms.h>
21 #include <linux/capability.h>
22 #include <linux/sched/mm.h>
23 #include <linux/slab.h>
24 #include <linux/percpu-refcount.h>
25 #include <linux/bpfptr.h>
27 struct bpf_verifier_env;
28 struct bpf_verifier_log;
37 struct exception_table_entry;
38 struct seq_operations;
39 struct bpf_iter_aux_info;
40 struct bpf_local_storage;
41 struct bpf_local_storage_map;
45 struct bpf_func_state;
47 extern struct idr btf_idr;
48 extern spinlock_t btf_idr_lock;
49 extern struct kobject *btf_kobj;
51 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
52 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
53 struct bpf_iter_aux_info *aux);
54 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
55 struct bpf_iter_seq_info {
56 const struct seq_operations *seq_ops;
57 bpf_iter_init_seq_priv_t init_seq_private;
58 bpf_iter_fini_seq_priv_t fini_seq_private;
62 /* map is generic key/value storage optionally accessible by eBPF programs */
64 /* funcs callable from userspace (via syscall) */
65 int (*map_alloc_check)(union bpf_attr *attr);
66 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
67 void (*map_release)(struct bpf_map *map, struct file *map_file);
68 void (*map_free)(struct bpf_map *map);
69 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
70 void (*map_release_uref)(struct bpf_map *map);
71 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
72 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
73 union bpf_attr __user *uattr);
74 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
75 void *value, u64 flags);
76 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
77 const union bpf_attr *attr,
78 union bpf_attr __user *uattr);
79 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
80 union bpf_attr __user *uattr);
81 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
82 union bpf_attr __user *uattr);
84 /* funcs callable from userspace and from eBPF programs */
85 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
86 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
87 int (*map_delete_elem)(struct bpf_map *map, void *key);
88 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
89 int (*map_pop_elem)(struct bpf_map *map, void *value);
90 int (*map_peek_elem)(struct bpf_map *map, void *value);
92 /* funcs called by prog_array and perf_event_array map */
93 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
95 void (*map_fd_put_ptr)(void *ptr);
96 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
97 u32 (*map_fd_sys_lookup_elem)(void *ptr);
98 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
100 int (*map_check_btf)(const struct bpf_map *map,
101 const struct btf *btf,
102 const struct btf_type *key_type,
103 const struct btf_type *value_type);
105 /* Prog poke tracking helpers. */
106 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
107 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
108 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
109 struct bpf_prog *new);
111 /* Direct value access helpers. */
112 int (*map_direct_value_addr)(const struct bpf_map *map,
114 int (*map_direct_value_meta)(const struct bpf_map *map,
116 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
117 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
118 struct poll_table_struct *pts);
120 /* Functions called by bpf_local_storage maps */
121 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
122 void *owner, u32 size);
123 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
124 void *owner, u32 size);
125 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
128 int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags);
130 /* map_meta_equal must be implemented for maps that can be
131 * used as an inner map. It is a runtime check to ensure
132 * an inner map can be inserted to an outer map.
134 * Some properties of the inner map has been used during the
135 * verification time. When inserting an inner map at the runtime,
136 * map_meta_equal has to ensure the inserting map has the same
137 * properties that the verifier has used earlier.
139 bool (*map_meta_equal)(const struct bpf_map *meta0,
140 const struct bpf_map *meta1);
143 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
144 struct bpf_func_state *caller,
145 struct bpf_func_state *callee);
146 int (*map_for_each_callback)(struct bpf_map *map,
147 bpf_callback_t callback_fn,
148 void *callback_ctx, u64 flags);
150 /* BTF name and id of struct allocated by map_alloc */
151 const char * const map_btf_name;
154 /* bpf_iter info used to open a seq_file */
155 const struct bpf_iter_seq_info *iter_seq_info;
159 /* The first two cachelines with read-mostly members of which some
160 * are also accessed in fast-path (e.g. ops, max_entries).
162 const struct bpf_map_ops *ops ____cacheline_aligned;
163 struct bpf_map *inner_map_meta;
164 #ifdef CONFIG_SECURITY
167 enum bpf_map_type map_type;
171 u64 map_extra; /* any per-map-type extra fields */
173 int spin_lock_off; /* >=0 valid offset, <0 error */
174 int timer_off; /* >=0 valid offset, <0 error */
178 u32 btf_value_type_id;
179 u32 btf_vmlinux_value_type_id;
181 #ifdef CONFIG_MEMCG_KMEM
182 struct mem_cgroup *memcg;
184 char name[BPF_OBJ_NAME_LEN];
186 bool frozen; /* write-once; write-protected by freeze_mutex */
189 /* The 3rd and 4th cacheline with misc members to avoid false sharing
190 * particularly with refcounting.
192 atomic64_t refcnt ____cacheline_aligned;
194 struct work_struct work;
195 struct mutex freeze_mutex;
197 /* 'Ownership' of program-containing map is claimed by the first program
198 * that is going to use this map or by the first program which FD is
199 * stored in the map to make sure that all callers and callees have the
200 * same prog type, JITed flag and xdp_has_frags flag.
204 enum bpf_prog_type type;
210 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
212 return map->spin_lock_off >= 0;
215 static inline bool map_value_has_timer(const struct bpf_map *map)
217 return map->timer_off >= 0;
220 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
222 if (unlikely(map_value_has_spin_lock(map)))
223 memset(dst + map->spin_lock_off, 0, sizeof(struct bpf_spin_lock));
224 if (unlikely(map_value_has_timer(map)))
225 memset(dst + map->timer_off, 0, sizeof(struct bpf_timer));
228 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */
229 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
231 u32 s_off = 0, s_sz = 0, t_off = 0, t_sz = 0;
233 if (unlikely(map_value_has_spin_lock(map))) {
234 s_off = map->spin_lock_off;
235 s_sz = sizeof(struct bpf_spin_lock);
237 if (unlikely(map_value_has_timer(map))) {
238 t_off = map->timer_off;
239 t_sz = sizeof(struct bpf_timer);
242 if (unlikely(s_sz || t_sz)) {
243 if (s_off < t_off || !s_sz) {
247 memcpy(dst, src, t_off);
248 memcpy(dst + t_off + t_sz,
250 s_off - t_off - t_sz);
251 memcpy(dst + s_off + s_sz,
253 map->value_size - s_off - s_sz);
255 memcpy(dst, src, map->value_size);
258 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
260 void bpf_timer_cancel_and_free(void *timer);
261 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
263 struct bpf_offload_dev;
264 struct bpf_offloaded_map;
266 struct bpf_map_dev_ops {
267 int (*map_get_next_key)(struct bpf_offloaded_map *map,
268 void *key, void *next_key);
269 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
270 void *key, void *value);
271 int (*map_update_elem)(struct bpf_offloaded_map *map,
272 void *key, void *value, u64 flags);
273 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
276 struct bpf_offloaded_map {
278 struct net_device *netdev;
279 const struct bpf_map_dev_ops *dev_ops;
281 struct list_head offloads;
284 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
286 return container_of(map, struct bpf_offloaded_map, map);
289 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
291 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
294 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
296 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
297 map->ops->map_seq_show_elem;
300 int map_check_no_btf(const struct bpf_map *map,
301 const struct btf *btf,
302 const struct btf_type *key_type,
303 const struct btf_type *value_type);
305 bool bpf_map_meta_equal(const struct bpf_map *meta0,
306 const struct bpf_map *meta1);
308 extern const struct bpf_map_ops bpf_map_offload_ops;
310 /* bpf_type_flag contains a set of flags that are applicable to the values of
311 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
312 * or a memory is read-only. We classify types into two categories: base types
313 * and extended types. Extended types are base types combined with a type flag.
315 * Currently there are no more than 32 base types in arg_type, ret_type and
318 #define BPF_BASE_TYPE_BITS 8
321 /* PTR may be NULL. */
322 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
324 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
325 * compatible with both mutable and immutable memory.
327 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
329 /* MEM was "allocated" from a different helper, and cannot be mixed
330 * with regular non-MEM_ALLOC'ed MEM types.
332 MEM_ALLOC = BIT(2 + BPF_BASE_TYPE_BITS),
334 /* MEM is in user address space. */
335 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
337 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
338 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
339 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
340 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
341 * to the specified cpu.
343 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
345 __BPF_TYPE_LAST_FLAG = MEM_PERCPU,
348 /* Max number of base types. */
349 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
351 /* Max number of all types. */
352 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
354 /* function argument constraints */
356 ARG_DONTCARE = 0, /* unused argument in helper function */
358 /* the following constraints used to prototype
359 * bpf_map_lookup/update/delete_elem() functions
361 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
362 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
363 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
364 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
366 /* the following constraints used to prototype bpf_memcmp() and other
367 * functions that access data on eBPF program stack
369 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
370 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
371 * helper function must fill all bytes or clear
372 * them in error case.
375 ARG_CONST_SIZE, /* number of bytes accessed from memory */
376 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
378 ARG_PTR_TO_CTX, /* pointer to context */
379 ARG_ANYTHING, /* any (initialized) argument is ok */
380 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
381 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
382 ARG_PTR_TO_INT, /* pointer to int */
383 ARG_PTR_TO_LONG, /* pointer to long */
384 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
385 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
386 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
387 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
388 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
389 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
390 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
391 ARG_PTR_TO_STACK, /* pointer to stack */
392 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
393 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
396 /* Extended arg_types. */
397 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
398 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
399 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
400 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
401 ARG_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM,
402 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
404 /* This must be the last entry. Its purpose is to ensure the enum is
405 * wide enough to hold the higher bits reserved for bpf_type_flag.
407 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
409 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
411 /* type of values returned from helper functions */
412 enum bpf_return_type {
413 RET_INTEGER, /* function returns integer */
414 RET_VOID, /* function doesn't return anything */
415 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
416 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
417 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
418 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
419 RET_PTR_TO_ALLOC_MEM, /* returns a pointer to dynamically allocated memory */
420 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
421 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
424 /* Extended ret_types. */
425 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
426 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
427 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
428 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
429 RET_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_ALLOC | RET_PTR_TO_ALLOC_MEM,
430 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
432 /* This must be the last entry. Its purpose is to ensure the enum is
433 * wide enough to hold the higher bits reserved for bpf_type_flag.
435 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
437 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
439 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
440 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
441 * instructions after verifying
443 struct bpf_func_proto {
444 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
447 enum bpf_return_type ret_type;
450 enum bpf_arg_type arg1_type;
451 enum bpf_arg_type arg2_type;
452 enum bpf_arg_type arg3_type;
453 enum bpf_arg_type arg4_type;
454 enum bpf_arg_type arg5_type;
456 enum bpf_arg_type arg_type[5];
468 int *ret_btf_id; /* return value btf_id */
469 bool (*allowed)(const struct bpf_prog *prog);
472 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
473 * the first argument to eBPF programs.
474 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
478 enum bpf_access_type {
483 /* types of values stored in eBPF registers */
484 /* Pointer types represent:
487 * pointer + (u16) var
488 * pointer + (u16) var + imm
489 * if (range > 0) then [ptr, ptr + range - off) is safe to access
490 * if (id > 0) means that some 'var' was added
491 * if (off > 0) means that 'imm' was added
494 NOT_INIT = 0, /* nothing was written into register */
495 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
496 PTR_TO_CTX, /* reg points to bpf_context */
497 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
498 PTR_TO_MAP_VALUE, /* reg points to map element value */
499 PTR_TO_MAP_KEY, /* reg points to a map element key */
500 PTR_TO_STACK, /* reg == frame_pointer + offset */
501 PTR_TO_PACKET_META, /* skb->data - meta_len */
502 PTR_TO_PACKET, /* reg points to skb->data */
503 PTR_TO_PACKET_END, /* skb->data + headlen */
504 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
505 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
506 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
507 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
508 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
509 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
510 /* PTR_TO_BTF_ID points to a kernel struct that does not need
511 * to be null checked by the BPF program. This does not imply the
512 * pointer is _not_ null and in practice this can easily be a null
513 * pointer when reading pointer chains. The assumption is program
514 * context will handle null pointer dereference typically via fault
515 * handling. The verifier must keep this in mind and can make no
516 * assumptions about null or non-null when doing branch analysis.
517 * Further, when passed into helpers the helpers can not, without
518 * additional context, assume the value is non-null.
521 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
522 * been checked for null. Used primarily to inform the verifier
523 * an explicit null check is required for this struct.
525 PTR_TO_MEM, /* reg points to valid memory region */
526 PTR_TO_BUF, /* reg points to a read/write buffer */
527 PTR_TO_FUNC, /* reg points to a bpf program function */
530 /* Extended reg_types. */
531 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
532 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
533 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
534 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
535 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
537 /* This must be the last entry. Its purpose is to ensure the enum is
538 * wide enough to hold the higher bits reserved for bpf_type_flag.
540 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
542 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
544 /* The information passed from prog-specific *_is_valid_access
545 * back to the verifier.
547 struct bpf_insn_access_aux {
548 enum bpf_reg_type reg_type;
556 struct bpf_verifier_log *log; /* for verbose logs */
560 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
562 aux->ctx_field_size = size;
565 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
567 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
568 insn->src_reg == BPF_PSEUDO_FUNC;
571 struct bpf_prog_ops {
572 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
573 union bpf_attr __user *uattr);
576 struct bpf_verifier_ops {
577 /* return eBPF function prototype for verification */
578 const struct bpf_func_proto *
579 (*get_func_proto)(enum bpf_func_id func_id,
580 const struct bpf_prog *prog);
582 /* return true if 'size' wide access at offset 'off' within bpf_context
583 * with 'type' (read or write) is allowed
585 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
586 const struct bpf_prog *prog,
587 struct bpf_insn_access_aux *info);
588 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
589 const struct bpf_prog *prog);
590 int (*gen_ld_abs)(const struct bpf_insn *orig,
591 struct bpf_insn *insn_buf);
592 u32 (*convert_ctx_access)(enum bpf_access_type type,
593 const struct bpf_insn *src,
594 struct bpf_insn *dst,
595 struct bpf_prog *prog, u32 *target_size);
596 int (*btf_struct_access)(struct bpf_verifier_log *log,
597 const struct btf *btf,
598 const struct btf_type *t, int off, int size,
599 enum bpf_access_type atype,
600 u32 *next_btf_id, enum bpf_type_flag *flag);
603 struct bpf_prog_offload_ops {
604 /* verifier basic callbacks */
605 int (*insn_hook)(struct bpf_verifier_env *env,
606 int insn_idx, int prev_insn_idx);
607 int (*finalize)(struct bpf_verifier_env *env);
608 /* verifier optimization callbacks (called after .finalize) */
609 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
610 struct bpf_insn *insn);
611 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
612 /* program management callbacks */
613 int (*prepare)(struct bpf_prog *prog);
614 int (*translate)(struct bpf_prog *prog);
615 void (*destroy)(struct bpf_prog *prog);
618 struct bpf_prog_offload {
619 struct bpf_prog *prog;
620 struct net_device *netdev;
621 struct bpf_offload_dev *offdev;
623 struct list_head offloads;
630 enum bpf_cgroup_storage_type {
631 BPF_CGROUP_STORAGE_SHARED,
632 BPF_CGROUP_STORAGE_PERCPU,
633 __BPF_CGROUP_STORAGE_MAX
636 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
638 /* The longest tracepoint has 12 args.
639 * See include/trace/bpf_probe.h
641 #define MAX_BPF_FUNC_ARGS 12
643 /* The maximum number of arguments passed through registers
644 * a single function may have.
646 #define MAX_BPF_FUNC_REG_ARGS 5
648 struct btf_func_model {
651 u8 arg_size[MAX_BPF_FUNC_ARGS];
654 /* Restore arguments before returning from trampoline to let original function
655 * continue executing. This flag is used for fentry progs when there are no
658 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
659 /* Call original function after fentry progs, but before fexit progs.
660 * Makes sense for fentry/fexit, normal calls and indirect calls.
662 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
663 /* Skip current frame and return to parent. Makes sense for fentry/fexit
664 * programs only. Should not be used with normal calls and indirect calls.
666 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
667 /* Store IP address of the caller on the trampoline stack,
668 * so it's available for trampoline's programs.
670 #define BPF_TRAMP_F_IP_ARG BIT(3)
671 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
672 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
674 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
675 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
677 #define BPF_MAX_TRAMP_PROGS 38
679 struct bpf_tramp_progs {
680 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
684 /* Different use cases for BPF trampoline:
685 * 1. replace nop at the function entry (kprobe equivalent)
686 * flags = BPF_TRAMP_F_RESTORE_REGS
687 * fentry = a set of programs to run before returning from trampoline
689 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
690 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
691 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
692 * fentry = a set of program to run before calling original function
693 * fexit = a set of program to run after original function
695 * 3. replace direct call instruction anywhere in the function body
696 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
698 * fentry = a set of programs to run before returning from trampoline
699 * With flags = BPF_TRAMP_F_CALL_ORIG
700 * orig_call = original callback addr or direct function addr
701 * fentry = a set of program to run before calling original function
702 * fexit = a set of program to run after original function
704 struct bpf_tramp_image;
705 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
706 const struct btf_func_model *m, u32 flags,
707 struct bpf_tramp_progs *tprogs,
709 /* these two functions are called from generated trampoline */
710 u64 notrace __bpf_prog_enter(struct bpf_prog *prog);
711 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
712 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog);
713 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start);
714 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
715 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
720 char name[KSYM_NAME_LEN];
721 struct list_head lnode;
722 struct latch_tree_node tnode;
726 enum bpf_tramp_prog_type {
729 BPF_TRAMP_MODIFY_RETURN,
731 BPF_TRAMP_REPLACE, /* more than MAX */
734 struct bpf_tramp_image {
736 struct bpf_ksym ksym;
737 struct percpu_ref pcref;
742 struct work_struct work;
746 struct bpf_trampoline {
747 /* hlist for trampoline_table */
748 struct hlist_node hlist;
749 /* serializes access to fields of this trampoline */
754 struct btf_func_model model;
758 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
759 * program by replacing one of its functions. func.addr is the address
760 * of the function it replaced.
762 struct bpf_prog *extension_prog;
763 /* list of BPF programs using this trampoline */
764 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
765 /* Number of attached programs. A counter per kind. */
766 int progs_cnt[BPF_TRAMP_MAX];
767 /* Executable image of trampoline */
768 struct bpf_tramp_image *cur_image;
773 struct bpf_attach_target_info {
774 struct btf_func_model fmodel;
776 const char *tgt_name;
777 const struct btf_type *tgt_type;
780 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
782 struct bpf_dispatcher_prog {
783 struct bpf_prog *prog;
787 struct bpf_dispatcher {
788 /* dispatcher mutex */
791 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
795 struct bpf_ksym ksym;
798 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
800 const struct bpf_insn *insnsi,
801 unsigned int (*bpf_func)(const void *,
802 const struct bpf_insn *))
804 return bpf_func(ctx, insnsi);
806 #ifdef CONFIG_BPF_JIT
807 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
808 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
809 struct bpf_trampoline *bpf_trampoline_get(u64 key,
810 struct bpf_attach_target_info *tgt_info);
811 void bpf_trampoline_put(struct bpf_trampoline *tr);
812 int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
813 #define BPF_DISPATCHER_INIT(_name) { \
814 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
815 .func = &_name##_func, \
822 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
826 #define DEFINE_BPF_DISPATCHER(name) \
827 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
829 const struct bpf_insn *insnsi, \
830 unsigned int (*bpf_func)(const void *, \
831 const struct bpf_insn *)) \
833 return bpf_func(ctx, insnsi); \
835 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
836 struct bpf_dispatcher bpf_dispatcher_##name = \
837 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
838 #define DECLARE_BPF_DISPATCHER(name) \
839 unsigned int bpf_dispatcher_##name##_func( \
841 const struct bpf_insn *insnsi, \
842 unsigned int (*bpf_func)(const void *, \
843 const struct bpf_insn *)); \
844 extern struct bpf_dispatcher bpf_dispatcher_##name;
845 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
846 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
847 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
848 struct bpf_prog *to);
849 /* Called only from JIT-enabled code, so there's no need for stubs. */
850 void *bpf_jit_alloc_exec_page(void);
851 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
852 void bpf_image_ksym_del(struct bpf_ksym *ksym);
853 void bpf_ksym_add(struct bpf_ksym *ksym);
854 void bpf_ksym_del(struct bpf_ksym *ksym);
855 int bpf_jit_charge_modmem(u32 size);
856 void bpf_jit_uncharge_modmem(u32 size);
857 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
859 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
860 struct bpf_trampoline *tr)
864 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
865 struct bpf_trampoline *tr)
869 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
870 struct bpf_attach_target_info *tgt_info)
872 return ERR_PTR(-EOPNOTSUPP);
874 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
875 #define DEFINE_BPF_DISPATCHER(name)
876 #define DECLARE_BPF_DISPATCHER(name)
877 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
878 #define BPF_DISPATCHER_PTR(name) NULL
879 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
880 struct bpf_prog *from,
881 struct bpf_prog *to) {}
882 static inline bool is_bpf_image_address(unsigned long address)
886 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
892 struct bpf_func_info_aux {
897 enum bpf_jit_poke_reason {
898 BPF_POKE_REASON_TAIL_CALL,
901 /* Descriptor of pokes pointing /into/ the JITed image. */
902 struct bpf_jit_poke_descriptor {
903 void *tailcall_target;
904 void *tailcall_bypass;
913 bool tailcall_target_stable;
919 /* reg_type info for ctx arguments */
920 struct bpf_ctx_arg_aux {
922 enum bpf_reg_type reg_type;
926 struct btf_mod_pair {
928 struct module *module;
931 struct bpf_kfunc_desc_tab;
933 struct bpf_prog_aux {
942 u32 func_cnt; /* used by non-func prog as the number of func progs */
943 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
944 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
945 u32 ctx_arg_info_size;
946 u32 max_rdonly_access;
948 struct btf *attach_btf;
949 const struct bpf_ctx_arg_aux *ctx_arg_info;
950 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
951 struct bpf_prog *dst_prog;
952 struct bpf_trampoline *dst_trampoline;
953 enum bpf_prog_type saved_dst_prog_type;
954 enum bpf_attach_type saved_dst_attach_type;
955 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
956 bool offload_requested;
957 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
958 bool func_proto_unreliable;
960 bool tail_call_reachable;
962 bool use_bpf_prog_pack;
963 struct hlist_node tramp_hlist;
964 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
965 const struct btf_type *attach_func_proto;
966 /* function name for valid attach_btf_id */
967 const char *attach_func_name;
968 struct bpf_prog **func;
969 void *jit_data; /* JIT specific data. arch dependent */
970 struct bpf_jit_poke_descriptor *poke_tab;
971 struct bpf_kfunc_desc_tab *kfunc_tab;
972 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
974 struct bpf_ksym ksym;
975 const struct bpf_prog_ops *ops;
976 struct bpf_map **used_maps;
977 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
978 struct btf_mod_pair *used_btfs;
979 struct bpf_prog *prog;
980 struct user_struct *user;
981 u64 load_time; /* ns since boottime */
983 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
984 char name[BPF_OBJ_NAME_LEN];
985 #ifdef CONFIG_SECURITY
988 struct bpf_prog_offload *offload;
990 struct bpf_func_info *func_info;
991 struct bpf_func_info_aux *func_info_aux;
992 /* bpf_line_info loaded from userspace. linfo->insn_off
993 * has the xlated insn offset.
994 * Both the main and sub prog share the same linfo.
995 * The subprog can access its first linfo by
996 * using the linfo_idx.
998 struct bpf_line_info *linfo;
999 /* jited_linfo is the jited addr of the linfo. It has a
1000 * one to one mapping to linfo:
1001 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1002 * Both the main and sub prog share the same jited_linfo.
1003 * The subprog can access its first jited_linfo by
1004 * using the linfo_idx.
1009 /* subprog can use linfo_idx to access its first linfo and
1011 * main prog always has linfo_idx == 0
1015 struct exception_table_entry *extable;
1017 struct work_struct work;
1018 struct rcu_head rcu;
1022 struct bpf_array_aux {
1023 /* Programs with direct jumps into programs part of this array. */
1024 struct list_head poke_progs;
1025 struct bpf_map *map;
1026 struct mutex poke_mutex;
1027 struct work_struct work;
1033 enum bpf_link_type type;
1034 const struct bpf_link_ops *ops;
1035 struct bpf_prog *prog;
1036 struct work_struct work;
1039 struct bpf_link_ops {
1040 void (*release)(struct bpf_link *link);
1041 void (*dealloc)(struct bpf_link *link);
1042 int (*detach)(struct bpf_link *link);
1043 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1044 struct bpf_prog *old_prog);
1045 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1046 int (*fill_link_info)(const struct bpf_link *link,
1047 struct bpf_link_info *info);
1050 struct bpf_link_primer {
1051 struct bpf_link *link;
1057 struct bpf_struct_ops_value;
1060 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1061 struct bpf_struct_ops {
1062 const struct bpf_verifier_ops *verifier_ops;
1063 int (*init)(struct btf *btf);
1064 int (*check_member)(const struct btf_type *t,
1065 const struct btf_member *member);
1066 int (*init_member)(const struct btf_type *t,
1067 const struct btf_member *member,
1068 void *kdata, const void *udata);
1069 int (*reg)(void *kdata);
1070 void (*unreg)(void *kdata);
1071 const struct btf_type *type;
1072 const struct btf_type *value_type;
1074 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1079 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1080 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1081 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1082 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1083 bool bpf_struct_ops_get(const void *kdata);
1084 void bpf_struct_ops_put(const void *kdata);
1085 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1087 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs,
1088 struct bpf_prog *prog,
1089 const struct btf_func_model *model,
1090 void *image, void *image_end);
1091 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1093 if (owner == BPF_MODULE_OWNER)
1094 return bpf_struct_ops_get(data);
1096 return try_module_get(owner);
1098 static inline void bpf_module_put(const void *data, struct module *owner)
1100 if (owner == BPF_MODULE_OWNER)
1101 bpf_struct_ops_put(data);
1107 /* Define it here to avoid the use of forward declaration */
1108 struct bpf_dummy_ops_state {
1112 struct bpf_dummy_ops {
1113 int (*test_1)(struct bpf_dummy_ops_state *cb);
1114 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1115 char a3, unsigned long a4);
1118 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1119 union bpf_attr __user *uattr);
1122 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1126 static inline void bpf_struct_ops_init(struct btf *btf,
1127 struct bpf_verifier_log *log)
1130 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1132 return try_module_get(owner);
1134 static inline void bpf_module_put(const void *data, struct module *owner)
1138 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1150 struct bpf_array_aux *aux;
1152 char value[0] __aligned(8);
1153 void *ptrs[0] __aligned(8);
1154 void __percpu *pptrs[0] __aligned(8);
1158 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1159 #define MAX_TAIL_CALL_CNT 33
1161 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1162 BPF_F_RDONLY_PROG | \
1166 #define BPF_MAP_CAN_READ BIT(0)
1167 #define BPF_MAP_CAN_WRITE BIT(1)
1169 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1171 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1173 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1176 if (access_flags & BPF_F_RDONLY_PROG)
1177 return BPF_MAP_CAN_READ;
1178 else if (access_flags & BPF_F_WRONLY_PROG)
1179 return BPF_MAP_CAN_WRITE;
1181 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1184 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1186 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1187 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1190 struct bpf_event_entry {
1191 struct perf_event *event;
1192 struct file *perf_file;
1193 struct file *map_file;
1194 struct rcu_head rcu;
1197 static inline bool map_type_contains_progs(struct bpf_map *map)
1199 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1200 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1201 map->map_type == BPF_MAP_TYPE_CPUMAP;
1204 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1205 int bpf_prog_calc_tag(struct bpf_prog *fp);
1207 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1208 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1210 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1211 unsigned long off, unsigned long len);
1212 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1213 const struct bpf_insn *src,
1214 struct bpf_insn *dst,
1215 struct bpf_prog *prog,
1218 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1219 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1221 /* an array of programs to be executed under rcu_lock.
1224 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run);
1226 * the structure returned by bpf_prog_array_alloc() should be populated
1227 * with program pointers and the last pointer must be NULL.
1228 * The user has to keep refcnt on the program and make sure the program
1229 * is removed from the array before bpf_prog_put().
1230 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1231 * since other cpus are walking the array of pointers in parallel.
1233 struct bpf_prog_array_item {
1234 struct bpf_prog *prog;
1236 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1241 struct bpf_prog_array {
1242 struct rcu_head rcu;
1243 struct bpf_prog_array_item items[];
1246 struct bpf_empty_prog_array {
1247 struct bpf_prog_array hdr;
1248 struct bpf_prog *null_prog;
1251 /* to avoid allocating empty bpf_prog_array for cgroups that
1252 * don't have bpf program attached use one global 'bpf_empty_prog_array'
1253 * It will not be modified the caller of bpf_prog_array_alloc()
1254 * (since caller requested prog_cnt == 0)
1255 * that pointer should be 'freed' by bpf_prog_array_free()
1257 extern struct bpf_empty_prog_array bpf_empty_prog_array;
1259 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1260 void bpf_prog_array_free(struct bpf_prog_array *progs);
1261 int bpf_prog_array_length(struct bpf_prog_array *progs);
1262 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1263 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1264 __u32 __user *prog_ids, u32 cnt);
1266 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1267 struct bpf_prog *old_prog);
1268 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1269 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1270 struct bpf_prog *prog);
1271 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1272 u32 *prog_ids, u32 request_cnt,
1274 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1275 struct bpf_prog *exclude_prog,
1276 struct bpf_prog *include_prog,
1278 struct bpf_prog_array **new_array);
1280 struct bpf_run_ctx {};
1282 struct bpf_cg_run_ctx {
1283 struct bpf_run_ctx run_ctx;
1284 const struct bpf_prog_array_item *prog_item;
1288 struct bpf_trace_run_ctx {
1289 struct bpf_run_ctx run_ctx;
1293 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1295 struct bpf_run_ctx *old_ctx = NULL;
1297 #ifdef CONFIG_BPF_SYSCALL
1298 old_ctx = current->bpf_ctx;
1299 current->bpf_ctx = new_ctx;
1304 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1306 #ifdef CONFIG_BPF_SYSCALL
1307 current->bpf_ctx = old_ctx;
1311 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1312 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1313 /* BPF program asks to set CN on the packet. */
1314 #define BPF_RET_SET_CN (1 << 0)
1316 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1318 static __always_inline int
1319 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu,
1320 const void *ctx, bpf_prog_run_fn run_prog,
1321 int retval, u32 *ret_flags)
1323 const struct bpf_prog_array_item *item;
1324 const struct bpf_prog *prog;
1325 const struct bpf_prog_array *array;
1326 struct bpf_run_ctx *old_run_ctx;
1327 struct bpf_cg_run_ctx run_ctx;
1330 run_ctx.retval = retval;
1333 array = rcu_dereference(array_rcu);
1334 item = &array->items[0];
1335 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1336 while ((prog = READ_ONCE(item->prog))) {
1337 run_ctx.prog_item = item;
1338 func_ret = run_prog(prog, ctx);
1339 if (!(func_ret & 1) && !IS_ERR_VALUE((long)run_ctx.retval))
1340 run_ctx.retval = -EPERM;
1341 *(ret_flags) |= (func_ret >> 1);
1344 bpf_reset_run_ctx(old_run_ctx);
1347 return run_ctx.retval;
1350 static __always_inline int
1351 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu,
1352 const void *ctx, bpf_prog_run_fn run_prog,
1355 const struct bpf_prog_array_item *item;
1356 const struct bpf_prog *prog;
1357 const struct bpf_prog_array *array;
1358 struct bpf_run_ctx *old_run_ctx;
1359 struct bpf_cg_run_ctx run_ctx;
1361 run_ctx.retval = retval;
1364 array = rcu_dereference(array_rcu);
1365 item = &array->items[0];
1366 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1367 while ((prog = READ_ONCE(item->prog))) {
1368 run_ctx.prog_item = item;
1369 if (!run_prog(prog, ctx) && !IS_ERR_VALUE((long)run_ctx.retval))
1370 run_ctx.retval = -EPERM;
1373 bpf_reset_run_ctx(old_run_ctx);
1376 return run_ctx.retval;
1379 static __always_inline u32
1380 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu,
1381 const void *ctx, bpf_prog_run_fn run_prog)
1383 const struct bpf_prog_array_item *item;
1384 const struct bpf_prog *prog;
1385 const struct bpf_prog_array *array;
1386 struct bpf_run_ctx *old_run_ctx;
1387 struct bpf_trace_run_ctx run_ctx;
1392 array = rcu_dereference(array_rcu);
1393 if (unlikely(!array))
1395 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1396 item = &array->items[0];
1397 while ((prog = READ_ONCE(item->prog))) {
1398 run_ctx.bpf_cookie = item->bpf_cookie;
1399 ret &= run_prog(prog, ctx);
1402 bpf_reset_run_ctx(old_run_ctx);
1409 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1410 * so BPF programs can request cwr for TCP packets.
1412 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1413 * packet. This macro changes the behavior so the low order bit
1414 * indicates whether the packet should be dropped (0) or not (1)
1415 * and the next bit is a congestion notification bit. This could be
1416 * used by TCP to call tcp_enter_cwr()
1418 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1421 * 2: drop packet and cn
1422 * 3: keep packet and cn
1424 * This macro then converts it to one of the NET_XMIT or an error
1425 * code that is then interpreted as drop packet (and no cn):
1426 * 0: NET_XMIT_SUCCESS skb should be transmitted
1427 * 1: NET_XMIT_DROP skb should be dropped and cn
1428 * 2: NET_XMIT_CN skb should be transmitted and cn
1429 * 3: -err skb should be dropped
1431 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1436 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, 0, &_flags); \
1437 _cn = _flags & BPF_RET_SET_CN; \
1438 if (_ret && !IS_ERR_VALUE((long)_ret)) \
1441 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1443 _ret = (_cn ? NET_XMIT_DROP : _ret); \
1447 #ifdef CONFIG_BPF_SYSCALL
1448 DECLARE_PER_CPU(int, bpf_prog_active);
1449 extern struct mutex bpf_stats_enabled_mutex;
1452 * Block execution of BPF programs attached to instrumentation (perf,
1453 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1454 * these events can happen inside a region which holds a map bucket lock
1455 * and can deadlock on it.
1457 static inline void bpf_disable_instrumentation(void)
1460 this_cpu_inc(bpf_prog_active);
1463 static inline void bpf_enable_instrumentation(void)
1465 this_cpu_dec(bpf_prog_active);
1469 extern const struct file_operations bpf_map_fops;
1470 extern const struct file_operations bpf_prog_fops;
1471 extern const struct file_operations bpf_iter_fops;
1473 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1474 extern const struct bpf_prog_ops _name ## _prog_ops; \
1475 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1476 #define BPF_MAP_TYPE(_id, _ops) \
1477 extern const struct bpf_map_ops _ops;
1478 #define BPF_LINK_TYPE(_id, _name)
1479 #include <linux/bpf_types.h>
1480 #undef BPF_PROG_TYPE
1482 #undef BPF_LINK_TYPE
1484 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1485 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1486 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1488 struct bpf_prog *bpf_prog_get(u32 ufd);
1489 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1491 void bpf_prog_add(struct bpf_prog *prog, int i);
1492 void bpf_prog_sub(struct bpf_prog *prog, int i);
1493 void bpf_prog_inc(struct bpf_prog *prog);
1494 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1495 void bpf_prog_put(struct bpf_prog *prog);
1497 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1498 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1500 struct bpf_map *bpf_map_get(u32 ufd);
1501 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1502 struct bpf_map *__bpf_map_get(struct fd f);
1503 void bpf_map_inc(struct bpf_map *map);
1504 void bpf_map_inc_with_uref(struct bpf_map *map);
1505 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1506 void bpf_map_put_with_uref(struct bpf_map *map);
1507 void bpf_map_put(struct bpf_map *map);
1508 void *bpf_map_area_alloc(u64 size, int numa_node);
1509 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1510 void bpf_map_area_free(void *base);
1511 bool bpf_map_write_active(const struct bpf_map *map);
1512 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1513 int generic_map_lookup_batch(struct bpf_map *map,
1514 const union bpf_attr *attr,
1515 union bpf_attr __user *uattr);
1516 int generic_map_update_batch(struct bpf_map *map,
1517 const union bpf_attr *attr,
1518 union bpf_attr __user *uattr);
1519 int generic_map_delete_batch(struct bpf_map *map,
1520 const union bpf_attr *attr,
1521 union bpf_attr __user *uattr);
1522 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1523 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1525 #ifdef CONFIG_MEMCG_KMEM
1526 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1528 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1529 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1530 size_t align, gfp_t flags);
1532 static inline void *
1533 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1536 return kmalloc_node(size, flags, node);
1539 static inline void *
1540 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1542 return kzalloc(size, flags);
1545 static inline void __percpu *
1546 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
1549 return __alloc_percpu_gfp(size, align, flags);
1553 extern int sysctl_unprivileged_bpf_disabled;
1555 static inline bool bpf_allow_ptr_leaks(void)
1557 return perfmon_capable();
1560 static inline bool bpf_allow_uninit_stack(void)
1562 return perfmon_capable();
1565 static inline bool bpf_allow_ptr_to_map_access(void)
1567 return perfmon_capable();
1570 static inline bool bpf_bypass_spec_v1(void)
1572 return perfmon_capable();
1575 static inline bool bpf_bypass_spec_v4(void)
1577 return perfmon_capable();
1580 int bpf_map_new_fd(struct bpf_map *map, int flags);
1581 int bpf_prog_new_fd(struct bpf_prog *prog);
1583 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1584 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1585 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1586 int bpf_link_settle(struct bpf_link_primer *primer);
1587 void bpf_link_cleanup(struct bpf_link_primer *primer);
1588 void bpf_link_inc(struct bpf_link *link);
1589 void bpf_link_put(struct bpf_link *link);
1590 int bpf_link_new_fd(struct bpf_link *link);
1591 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1592 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1594 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1595 int bpf_obj_get_user(const char __user *pathname, int flags);
1597 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1598 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1599 extern int bpf_iter_ ## target(args); \
1600 int __init bpf_iter_ ## target(args) { return 0; }
1602 struct bpf_iter_aux_info {
1603 struct bpf_map *map;
1606 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1607 union bpf_iter_link_info *linfo,
1608 struct bpf_iter_aux_info *aux);
1609 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1610 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1611 struct seq_file *seq);
1612 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1613 struct bpf_link_info *info);
1614 typedef const struct bpf_func_proto *
1615 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
1616 const struct bpf_prog *prog);
1618 enum bpf_iter_feature {
1619 BPF_ITER_RESCHED = BIT(0),
1622 #define BPF_ITER_CTX_ARG_MAX 2
1623 struct bpf_iter_reg {
1625 bpf_iter_attach_target_t attach_target;
1626 bpf_iter_detach_target_t detach_target;
1627 bpf_iter_show_fdinfo_t show_fdinfo;
1628 bpf_iter_fill_link_info_t fill_link_info;
1629 bpf_iter_get_func_proto_t get_func_proto;
1630 u32 ctx_arg_info_size;
1632 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1633 const struct bpf_iter_seq_info *seq_info;
1636 struct bpf_iter_meta {
1637 __bpf_md_ptr(struct seq_file *, seq);
1642 struct bpf_iter__bpf_map_elem {
1643 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1644 __bpf_md_ptr(struct bpf_map *, map);
1645 __bpf_md_ptr(void *, key);
1646 __bpf_md_ptr(void *, value);
1649 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1650 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1651 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1652 const struct bpf_func_proto *
1653 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
1654 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
1655 int bpf_iter_new_fd(struct bpf_link *link);
1656 bool bpf_link_is_iter(struct bpf_link *link);
1657 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1658 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1659 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1660 struct seq_file *seq);
1661 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1662 struct bpf_link_info *info);
1664 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
1665 struct bpf_func_state *caller,
1666 struct bpf_func_state *callee);
1668 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1669 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1670 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1672 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1675 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1677 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1678 void *key, void *value, u64 map_flags);
1679 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1680 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1681 void *key, void *value, u64 map_flags);
1682 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1684 int bpf_get_file_flag(int flags);
1685 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
1686 size_t actual_size);
1688 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1689 * forced to use 'long' read/writes to try to atomically copy long counters.
1690 * Best-effort only. No barriers here, since it _will_ race with concurrent
1691 * updates from BPF programs. Called from bpf syscall and mostly used with
1692 * size 8 or 16 bytes, so ask compiler to inline it.
1694 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1696 const long *lsrc = src;
1699 size /= sizeof(long);
1704 /* verify correctness of eBPF program */
1705 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
1707 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1708 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1711 struct btf *bpf_get_btf_vmlinux(void);
1716 struct bpf_dtab_netdev;
1717 struct bpf_cpu_map_entry;
1719 void __dev_flush(void);
1720 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
1721 struct net_device *dev_rx);
1722 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
1723 struct net_device *dev_rx);
1724 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
1725 struct bpf_map *map, bool exclude_ingress);
1726 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1727 struct bpf_prog *xdp_prog);
1728 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1729 struct bpf_prog *xdp_prog, struct bpf_map *map,
1730 bool exclude_ingress);
1732 void __cpu_map_flush(void);
1733 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
1734 struct net_device *dev_rx);
1735 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1736 struct sk_buff *skb);
1738 /* Return map's numa specified by userspace */
1739 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1741 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1742 attr->numa_node : NUMA_NO_NODE;
1745 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1746 int array_map_alloc_check(union bpf_attr *attr);
1748 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1749 union bpf_attr __user *uattr);
1750 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1751 union bpf_attr __user *uattr);
1752 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1753 const union bpf_attr *kattr,
1754 union bpf_attr __user *uattr);
1755 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1756 const union bpf_attr *kattr,
1757 union bpf_attr __user *uattr);
1758 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1759 const union bpf_attr *kattr,
1760 union bpf_attr __user *uattr);
1761 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1762 const union bpf_attr *kattr,
1763 union bpf_attr __user *uattr);
1764 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1765 const struct bpf_prog *prog,
1766 struct bpf_insn_access_aux *info);
1768 static inline bool bpf_tracing_ctx_access(int off, int size,
1769 enum bpf_access_type type)
1771 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
1773 if (type != BPF_READ)
1775 if (off % size != 0)
1780 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
1781 enum bpf_access_type type,
1782 const struct bpf_prog *prog,
1783 struct bpf_insn_access_aux *info)
1785 if (!bpf_tracing_ctx_access(off, size, type))
1787 return btf_ctx_access(off, size, type, prog, info);
1790 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf,
1791 const struct btf_type *t, int off, int size,
1792 enum bpf_access_type atype,
1793 u32 *next_btf_id, enum bpf_type_flag *flag);
1794 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1795 const struct btf *btf, u32 id, int off,
1796 const struct btf *need_btf, u32 need_type_id);
1798 int btf_distill_func_proto(struct bpf_verifier_log *log,
1800 const struct btf_type *func_proto,
1801 const char *func_name,
1802 struct btf_func_model *m);
1804 struct bpf_reg_state;
1805 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
1806 struct bpf_reg_state *regs);
1807 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
1808 const struct btf *btf, u32 func_id,
1809 struct bpf_reg_state *regs);
1810 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1811 struct bpf_reg_state *reg);
1812 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1813 struct btf *btf, const struct btf_type *t);
1815 struct bpf_prog *bpf_prog_by_id(u32 id);
1816 struct bpf_link *bpf_link_by_id(u32 id);
1818 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1819 void bpf_task_storage_free(struct task_struct *task);
1820 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
1821 const struct btf_func_model *
1822 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1823 const struct bpf_insn *insn);
1824 struct bpf_core_ctx {
1825 struct bpf_verifier_log *log;
1826 const struct btf *btf;
1829 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
1830 int relo_idx, void *insn);
1832 static inline bool unprivileged_ebpf_enabled(void)
1834 return !sysctl_unprivileged_bpf_disabled;
1837 #else /* !CONFIG_BPF_SYSCALL */
1838 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1840 return ERR_PTR(-EOPNOTSUPP);
1843 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1844 enum bpf_prog_type type,
1847 return ERR_PTR(-EOPNOTSUPP);
1850 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1854 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1858 static inline void bpf_prog_put(struct bpf_prog *prog)
1862 static inline void bpf_prog_inc(struct bpf_prog *prog)
1866 static inline struct bpf_prog *__must_check
1867 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1869 return ERR_PTR(-EOPNOTSUPP);
1872 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1873 const struct bpf_link_ops *ops,
1874 struct bpf_prog *prog)
1878 static inline int bpf_link_prime(struct bpf_link *link,
1879 struct bpf_link_primer *primer)
1884 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1889 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1893 static inline void bpf_link_inc(struct bpf_link *link)
1897 static inline void bpf_link_put(struct bpf_link *link)
1901 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1906 static inline void __dev_flush(void)
1911 struct bpf_dtab_netdev;
1912 struct bpf_cpu_map_entry;
1915 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
1916 struct net_device *dev_rx)
1922 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
1923 struct net_device *dev_rx)
1929 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
1930 struct bpf_map *map, bool exclude_ingress)
1937 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1938 struct sk_buff *skb,
1939 struct bpf_prog *xdp_prog)
1945 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1946 struct bpf_prog *xdp_prog, struct bpf_map *map,
1947 bool exclude_ingress)
1952 static inline void __cpu_map_flush(void)
1956 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1957 struct xdp_frame *xdpf,
1958 struct net_device *dev_rx)
1963 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1964 struct sk_buff *skb)
1969 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1970 enum bpf_prog_type type)
1972 return ERR_PTR(-EOPNOTSUPP);
1975 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1976 const union bpf_attr *kattr,
1977 union bpf_attr __user *uattr)
1982 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1983 const union bpf_attr *kattr,
1984 union bpf_attr __user *uattr)
1989 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1990 const union bpf_attr *kattr,
1991 union bpf_attr __user *uattr)
1996 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1997 const union bpf_attr *kattr,
1998 union bpf_attr __user *uattr)
2003 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2004 const union bpf_attr *kattr,
2005 union bpf_attr __user *uattr)
2010 static inline void bpf_map_put(struct bpf_map *map)
2014 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2016 return ERR_PTR(-ENOTSUPP);
2019 static inline const struct bpf_func_proto *
2020 bpf_base_func_proto(enum bpf_func_id func_id)
2025 static inline void bpf_task_storage_free(struct task_struct *task)
2029 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2034 static inline const struct btf_func_model *
2035 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2036 const struct bpf_insn *insn)
2041 static inline bool unprivileged_ebpf_enabled(void)
2046 #endif /* CONFIG_BPF_SYSCALL */
2048 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2049 struct btf_mod_pair *used_btfs, u32 len);
2051 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2052 enum bpf_prog_type type)
2054 return bpf_prog_get_type_dev(ufd, type, false);
2057 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2058 struct bpf_map **used_maps, u32 len);
2060 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2062 int bpf_prog_offload_compile(struct bpf_prog *prog);
2063 void bpf_prog_offload_destroy(struct bpf_prog *prog);
2064 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2065 struct bpf_prog *prog);
2067 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2069 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2070 int bpf_map_offload_update_elem(struct bpf_map *map,
2071 void *key, void *value, u64 flags);
2072 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2073 int bpf_map_offload_get_next_key(struct bpf_map *map,
2074 void *key, void *next_key);
2076 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2078 struct bpf_offload_dev *
2079 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2080 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2081 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2082 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2083 struct net_device *netdev);
2084 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2085 struct net_device *netdev);
2086 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2088 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2089 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
2091 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2093 return aux->offload_requested;
2096 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2098 return unlikely(map->ops == &bpf_map_offload_ops);
2101 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2102 void bpf_map_offload_map_free(struct bpf_map *map);
2103 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2104 const union bpf_attr *kattr,
2105 union bpf_attr __user *uattr);
2107 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2108 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2109 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2110 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2111 union bpf_attr __user *uattr);
2113 void sock_map_unhash(struct sock *sk);
2114 void sock_map_close(struct sock *sk, long timeout);
2116 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
2117 union bpf_attr *attr)
2122 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
2127 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2132 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2134 return ERR_PTR(-EOPNOTSUPP);
2137 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2141 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2142 const union bpf_attr *kattr,
2143 union bpf_attr __user *uattr)
2148 #ifdef CONFIG_BPF_SYSCALL
2149 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2150 struct bpf_prog *prog)
2155 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2156 enum bpf_prog_type ptype)
2161 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2167 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2168 union bpf_attr __user *uattr)
2172 #endif /* CONFIG_BPF_SYSCALL */
2173 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2175 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2176 void bpf_sk_reuseport_detach(struct sock *sk);
2177 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2179 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2180 void *value, u64 map_flags);
2182 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2186 #ifdef CONFIG_BPF_SYSCALL
2187 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2188 void *key, void *value)
2193 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2194 void *key, void *value,
2199 #endif /* CONFIG_BPF_SYSCALL */
2200 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2202 /* verifier prototypes for helper functions called from eBPF programs */
2203 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2204 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2205 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2206 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2207 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2208 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2210 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2211 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2212 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2213 extern const struct bpf_func_proto bpf_tail_call_proto;
2214 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2215 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2216 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2217 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2218 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2219 extern const struct bpf_func_proto bpf_get_stackid_proto;
2220 extern const struct bpf_func_proto bpf_get_stack_proto;
2221 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2222 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2223 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2224 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2225 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2226 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2227 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2228 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2229 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2230 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2231 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2232 extern const struct bpf_func_proto bpf_spin_lock_proto;
2233 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2234 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2235 extern const struct bpf_func_proto bpf_strtol_proto;
2236 extern const struct bpf_func_proto bpf_strtoul_proto;
2237 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2238 extern const struct bpf_func_proto bpf_jiffies64_proto;
2239 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2240 extern const struct bpf_func_proto bpf_event_output_data_proto;
2241 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2242 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2243 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2244 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2245 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2246 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2247 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2248 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2249 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2250 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2251 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
2252 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2253 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2254 extern const struct bpf_func_proto bpf_snprintf_proto;
2255 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2256 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2257 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2258 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2259 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2260 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2261 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2262 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2263 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2264 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2265 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2266 extern const struct bpf_func_proto bpf_kallsyms_lookup_name_proto;
2267 extern const struct bpf_func_proto bpf_find_vma_proto;
2268 extern const struct bpf_func_proto bpf_loop_proto;
2269 extern const struct bpf_func_proto bpf_strncmp_proto;
2270 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
2272 const struct bpf_func_proto *tracing_prog_func_proto(
2273 enum bpf_func_id func_id, const struct bpf_prog *prog);
2275 /* Shared helpers among cBPF and eBPF. */
2276 void bpf_user_rnd_init_once(void);
2277 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2278 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2280 #if defined(CONFIG_NET)
2281 bool bpf_sock_common_is_valid_access(int off, int size,
2282 enum bpf_access_type type,
2283 struct bpf_insn_access_aux *info);
2284 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2285 struct bpf_insn_access_aux *info);
2286 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2287 const struct bpf_insn *si,
2288 struct bpf_insn *insn_buf,
2289 struct bpf_prog *prog,
2292 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2293 enum bpf_access_type type,
2294 struct bpf_insn_access_aux *info)
2298 static inline bool bpf_sock_is_valid_access(int off, int size,
2299 enum bpf_access_type type,
2300 struct bpf_insn_access_aux *info)
2304 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2305 const struct bpf_insn *si,
2306 struct bpf_insn *insn_buf,
2307 struct bpf_prog *prog,
2315 struct sk_reuseport_kern {
2316 struct sk_buff *skb;
2318 struct sock *selected_sk;
2319 struct sock *migrating_sk;
2325 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2326 struct bpf_insn_access_aux *info);
2328 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2329 const struct bpf_insn *si,
2330 struct bpf_insn *insn_buf,
2331 struct bpf_prog *prog,
2334 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2335 struct bpf_insn_access_aux *info);
2337 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2338 const struct bpf_insn *si,
2339 struct bpf_insn *insn_buf,
2340 struct bpf_prog *prog,
2343 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2344 enum bpf_access_type type,
2345 struct bpf_insn_access_aux *info)
2350 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2351 const struct bpf_insn *si,
2352 struct bpf_insn *insn_buf,
2353 struct bpf_prog *prog,
2358 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2359 enum bpf_access_type type,
2360 struct bpf_insn_access_aux *info)
2365 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2366 const struct bpf_insn *si,
2367 struct bpf_insn *insn_buf,
2368 struct bpf_prog *prog,
2373 #endif /* CONFIG_INET */
2375 enum bpf_text_poke_type {
2380 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2381 void *addr1, void *addr2);
2383 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
2386 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2388 #define MAX_BPRINTF_VARARGS 12
2390 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2391 u32 **bin_buf, u32 num_args);
2392 void bpf_bprintf_cleanup(void);
2394 #endif /* _LINUX_BPF_H */