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 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
224 (struct bpf_spin_lock){};
225 if (unlikely(map_value_has_timer(map)))
226 *(struct bpf_timer *)(dst + map->timer_off) =
227 (struct bpf_timer){};
230 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */
231 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
233 u32 s_off = 0, s_sz = 0, t_off = 0, t_sz = 0;
235 if (unlikely(map_value_has_spin_lock(map))) {
236 s_off = map->spin_lock_off;
237 s_sz = sizeof(struct bpf_spin_lock);
238 } else if (unlikely(map_value_has_timer(map))) {
239 t_off = map->timer_off;
240 t_sz = sizeof(struct bpf_timer);
243 if (unlikely(s_sz || t_sz)) {
244 if (s_off < t_off || !s_sz) {
248 memcpy(dst, src, t_off);
249 memcpy(dst + t_off + t_sz,
251 s_off - t_off - t_sz);
252 memcpy(dst + s_off + s_sz,
254 map->value_size - s_off - s_sz);
256 memcpy(dst, src, map->value_size);
259 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
261 void bpf_timer_cancel_and_free(void *timer);
262 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
264 struct bpf_offload_dev;
265 struct bpf_offloaded_map;
267 struct bpf_map_dev_ops {
268 int (*map_get_next_key)(struct bpf_offloaded_map *map,
269 void *key, void *next_key);
270 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
271 void *key, void *value);
272 int (*map_update_elem)(struct bpf_offloaded_map *map,
273 void *key, void *value, u64 flags);
274 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
277 struct bpf_offloaded_map {
279 struct net_device *netdev;
280 const struct bpf_map_dev_ops *dev_ops;
282 struct list_head offloads;
285 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
287 return container_of(map, struct bpf_offloaded_map, map);
290 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
292 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
295 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
297 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
298 map->ops->map_seq_show_elem;
301 int map_check_no_btf(const struct bpf_map *map,
302 const struct btf *btf,
303 const struct btf_type *key_type,
304 const struct btf_type *value_type);
306 bool bpf_map_meta_equal(const struct bpf_map *meta0,
307 const struct bpf_map *meta1);
309 extern const struct bpf_map_ops bpf_map_offload_ops;
311 /* bpf_type_flag contains a set of flags that are applicable to the values of
312 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
313 * or a memory is read-only. We classify types into two categories: base types
314 * and extended types. Extended types are base types combined with a type flag.
316 * Currently there are no more than 32 base types in arg_type, ret_type and
319 #define BPF_BASE_TYPE_BITS 8
322 /* PTR may be NULL. */
323 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
325 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
326 * compatible with both mutable and immutable memory.
328 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
330 /* MEM was "allocated" from a different helper, and cannot be mixed
331 * with regular non-MEM_ALLOC'ed MEM types.
333 MEM_ALLOC = BIT(2 + BPF_BASE_TYPE_BITS),
335 __BPF_TYPE_LAST_FLAG = MEM_ALLOC,
338 /* Max number of base types. */
339 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
341 /* Max number of all types. */
342 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
344 /* function argument constraints */
346 ARG_DONTCARE = 0, /* unused argument in helper function */
348 /* the following constraints used to prototype
349 * bpf_map_lookup/update/delete_elem() functions
351 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
352 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
353 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
354 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
356 /* the following constraints used to prototype bpf_memcmp() and other
357 * functions that access data on eBPF program stack
359 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
360 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
361 * helper function must fill all bytes or clear
362 * them in error case.
365 ARG_CONST_SIZE, /* number of bytes accessed from memory */
366 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
368 ARG_PTR_TO_CTX, /* pointer to context */
369 ARG_ANYTHING, /* any (initialized) argument is ok */
370 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
371 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
372 ARG_PTR_TO_INT, /* pointer to int */
373 ARG_PTR_TO_LONG, /* pointer to long */
374 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
375 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
376 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
377 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
378 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
379 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
380 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
381 ARG_PTR_TO_STACK, /* pointer to stack */
382 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
383 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
386 /* Extended arg_types. */
387 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
388 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
389 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
390 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
391 ARG_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM,
392 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
394 /* This must be the last entry. Its purpose is to ensure the enum is
395 * wide enough to hold the higher bits reserved for bpf_type_flag.
397 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
399 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
401 /* type of values returned from helper functions */
402 enum bpf_return_type {
403 RET_INTEGER, /* function returns integer */
404 RET_VOID, /* function doesn't return anything */
405 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
406 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
407 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
408 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
409 RET_PTR_TO_ALLOC_MEM, /* returns a pointer to dynamically allocated memory */
410 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
411 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
414 /* Extended ret_types. */
415 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
416 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
417 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
418 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
419 RET_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_ALLOC | RET_PTR_TO_ALLOC_MEM,
420 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
422 /* This must be the last entry. Its purpose is to ensure the enum is
423 * wide enough to hold the higher bits reserved for bpf_type_flag.
425 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
427 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
429 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
430 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
431 * instructions after verifying
433 struct bpf_func_proto {
434 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
437 enum bpf_return_type ret_type;
440 enum bpf_arg_type arg1_type;
441 enum bpf_arg_type arg2_type;
442 enum bpf_arg_type arg3_type;
443 enum bpf_arg_type arg4_type;
444 enum bpf_arg_type arg5_type;
446 enum bpf_arg_type arg_type[5];
458 int *ret_btf_id; /* return value btf_id */
459 bool (*allowed)(const struct bpf_prog *prog);
462 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
463 * the first argument to eBPF programs.
464 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
468 enum bpf_access_type {
473 /* types of values stored in eBPF registers */
474 /* Pointer types represent:
477 * pointer + (u16) var
478 * pointer + (u16) var + imm
479 * if (range > 0) then [ptr, ptr + range - off) is safe to access
480 * if (id > 0) means that some 'var' was added
481 * if (off > 0) means that 'imm' was added
484 NOT_INIT = 0, /* nothing was written into register */
485 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
486 PTR_TO_CTX, /* reg points to bpf_context */
487 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
488 PTR_TO_MAP_VALUE, /* reg points to map element value */
489 PTR_TO_MAP_KEY, /* reg points to a map element key */
490 PTR_TO_STACK, /* reg == frame_pointer + offset */
491 PTR_TO_PACKET_META, /* skb->data - meta_len */
492 PTR_TO_PACKET, /* reg points to skb->data */
493 PTR_TO_PACKET_END, /* skb->data + headlen */
494 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
495 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
496 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
497 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
498 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
499 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
500 /* PTR_TO_BTF_ID points to a kernel struct that does not need
501 * to be null checked by the BPF program. This does not imply the
502 * pointer is _not_ null and in practice this can easily be a null
503 * pointer when reading pointer chains. The assumption is program
504 * context will handle null pointer dereference typically via fault
505 * handling. The verifier must keep this in mind and can make no
506 * assumptions about null or non-null when doing branch analysis.
507 * Further, when passed into helpers the helpers can not, without
508 * additional context, assume the value is non-null.
511 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
512 * been checked for null. Used primarily to inform the verifier
513 * an explicit null check is required for this struct.
515 PTR_TO_MEM, /* reg points to valid memory region */
516 PTR_TO_BUF, /* reg points to a read/write buffer */
517 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */
518 PTR_TO_FUNC, /* reg points to a bpf program function */
521 /* Extended reg_types. */
522 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
523 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
524 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
525 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
526 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
528 /* This must be the last entry. Its purpose is to ensure the enum is
529 * wide enough to hold the higher bits reserved for bpf_type_flag.
531 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
533 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
535 /* The information passed from prog-specific *_is_valid_access
536 * back to the verifier.
538 struct bpf_insn_access_aux {
539 enum bpf_reg_type reg_type;
547 struct bpf_verifier_log *log; /* for verbose logs */
551 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
553 aux->ctx_field_size = size;
556 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
558 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
559 insn->src_reg == BPF_PSEUDO_FUNC;
562 struct bpf_prog_ops {
563 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
564 union bpf_attr __user *uattr);
567 struct bpf_verifier_ops {
568 /* return eBPF function prototype for verification */
569 const struct bpf_func_proto *
570 (*get_func_proto)(enum bpf_func_id func_id,
571 const struct bpf_prog *prog);
573 /* return true if 'size' wide access at offset 'off' within bpf_context
574 * with 'type' (read or write) is allowed
576 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
577 const struct bpf_prog *prog,
578 struct bpf_insn_access_aux *info);
579 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
580 const struct bpf_prog *prog);
581 int (*gen_ld_abs)(const struct bpf_insn *orig,
582 struct bpf_insn *insn_buf);
583 u32 (*convert_ctx_access)(enum bpf_access_type type,
584 const struct bpf_insn *src,
585 struct bpf_insn *dst,
586 struct bpf_prog *prog, u32 *target_size);
587 int (*btf_struct_access)(struct bpf_verifier_log *log,
588 const struct btf *btf,
589 const struct btf_type *t, int off, int size,
590 enum bpf_access_type atype,
594 struct bpf_prog_offload_ops {
595 /* verifier basic callbacks */
596 int (*insn_hook)(struct bpf_verifier_env *env,
597 int insn_idx, int prev_insn_idx);
598 int (*finalize)(struct bpf_verifier_env *env);
599 /* verifier optimization callbacks (called after .finalize) */
600 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
601 struct bpf_insn *insn);
602 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
603 /* program management callbacks */
604 int (*prepare)(struct bpf_prog *prog);
605 int (*translate)(struct bpf_prog *prog);
606 void (*destroy)(struct bpf_prog *prog);
609 struct bpf_prog_offload {
610 struct bpf_prog *prog;
611 struct net_device *netdev;
612 struct bpf_offload_dev *offdev;
614 struct list_head offloads;
621 enum bpf_cgroup_storage_type {
622 BPF_CGROUP_STORAGE_SHARED,
623 BPF_CGROUP_STORAGE_PERCPU,
624 __BPF_CGROUP_STORAGE_MAX
627 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
629 /* The longest tracepoint has 12 args.
630 * See include/trace/bpf_probe.h
632 #define MAX_BPF_FUNC_ARGS 12
634 /* The maximum number of arguments passed through registers
635 * a single function may have.
637 #define MAX_BPF_FUNC_REG_ARGS 5
639 struct btf_func_model {
642 u8 arg_size[MAX_BPF_FUNC_ARGS];
645 /* Restore arguments before returning from trampoline to let original function
646 * continue executing. This flag is used for fentry progs when there are no
649 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
650 /* Call original function after fentry progs, but before fexit progs.
651 * Makes sense for fentry/fexit, normal calls and indirect calls.
653 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
654 /* Skip current frame and return to parent. Makes sense for fentry/fexit
655 * programs only. Should not be used with normal calls and indirect calls.
657 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
658 /* Store IP address of the caller on the trampoline stack,
659 * so it's available for trampoline's programs.
661 #define BPF_TRAMP_F_IP_ARG BIT(3)
662 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
663 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
665 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
666 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
668 #define BPF_MAX_TRAMP_PROGS 38
670 struct bpf_tramp_progs {
671 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
675 /* Different use cases for BPF trampoline:
676 * 1. replace nop at the function entry (kprobe equivalent)
677 * flags = BPF_TRAMP_F_RESTORE_REGS
678 * fentry = a set of programs to run before returning from trampoline
680 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
681 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
682 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
683 * fentry = a set of program to run before calling original function
684 * fexit = a set of program to run after original function
686 * 3. replace direct call instruction anywhere in the function body
687 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
689 * fentry = a set of programs to run before returning from trampoline
690 * With flags = BPF_TRAMP_F_CALL_ORIG
691 * orig_call = original callback addr or direct function addr
692 * fentry = a set of program to run before calling original function
693 * fexit = a set of program to run after original function
695 struct bpf_tramp_image;
696 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
697 const struct btf_func_model *m, u32 flags,
698 struct bpf_tramp_progs *tprogs,
700 /* these two functions are called from generated trampoline */
701 u64 notrace __bpf_prog_enter(struct bpf_prog *prog);
702 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
703 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog);
704 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start);
705 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
706 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
711 char name[KSYM_NAME_LEN];
712 struct list_head lnode;
713 struct latch_tree_node tnode;
717 enum bpf_tramp_prog_type {
720 BPF_TRAMP_MODIFY_RETURN,
722 BPF_TRAMP_REPLACE, /* more than MAX */
725 struct bpf_tramp_image {
727 struct bpf_ksym ksym;
728 struct percpu_ref pcref;
733 struct work_struct work;
737 struct bpf_trampoline {
738 /* hlist for trampoline_table */
739 struct hlist_node hlist;
740 /* serializes access to fields of this trampoline */
745 struct btf_func_model model;
749 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
750 * program by replacing one of its functions. func.addr is the address
751 * of the function it replaced.
753 struct bpf_prog *extension_prog;
754 /* list of BPF programs using this trampoline */
755 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
756 /* Number of attached programs. A counter per kind. */
757 int progs_cnt[BPF_TRAMP_MAX];
758 /* Executable image of trampoline */
759 struct bpf_tramp_image *cur_image;
764 struct bpf_attach_target_info {
765 struct btf_func_model fmodel;
767 const char *tgt_name;
768 const struct btf_type *tgt_type;
771 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
773 struct bpf_dispatcher_prog {
774 struct bpf_prog *prog;
778 struct bpf_dispatcher {
779 /* dispatcher mutex */
782 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
786 struct bpf_ksym ksym;
789 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
791 const struct bpf_insn *insnsi,
792 unsigned int (*bpf_func)(const void *,
793 const struct bpf_insn *))
795 return bpf_func(ctx, insnsi);
797 #ifdef CONFIG_BPF_JIT
798 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
799 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
800 struct bpf_trampoline *bpf_trampoline_get(u64 key,
801 struct bpf_attach_target_info *tgt_info);
802 void bpf_trampoline_put(struct bpf_trampoline *tr);
803 int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
804 #define BPF_DISPATCHER_INIT(_name) { \
805 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
806 .func = &_name##_func, \
813 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
817 #define DEFINE_BPF_DISPATCHER(name) \
818 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
820 const struct bpf_insn *insnsi, \
821 unsigned int (*bpf_func)(const void *, \
822 const struct bpf_insn *)) \
824 return bpf_func(ctx, insnsi); \
826 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
827 struct bpf_dispatcher bpf_dispatcher_##name = \
828 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
829 #define DECLARE_BPF_DISPATCHER(name) \
830 unsigned int bpf_dispatcher_##name##_func( \
832 const struct bpf_insn *insnsi, \
833 unsigned int (*bpf_func)(const void *, \
834 const struct bpf_insn *)); \
835 extern struct bpf_dispatcher bpf_dispatcher_##name;
836 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
837 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
838 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
839 struct bpf_prog *to);
840 /* Called only from JIT-enabled code, so there's no need for stubs. */
841 void *bpf_jit_alloc_exec_page(void);
842 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
843 void bpf_image_ksym_del(struct bpf_ksym *ksym);
844 void bpf_ksym_add(struct bpf_ksym *ksym);
845 void bpf_ksym_del(struct bpf_ksym *ksym);
846 int bpf_jit_charge_modmem(u32 pages);
847 void bpf_jit_uncharge_modmem(u32 pages);
848 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
850 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
851 struct bpf_trampoline *tr)
855 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
856 struct bpf_trampoline *tr)
860 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
861 struct bpf_attach_target_info *tgt_info)
863 return ERR_PTR(-EOPNOTSUPP);
865 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
866 #define DEFINE_BPF_DISPATCHER(name)
867 #define DECLARE_BPF_DISPATCHER(name)
868 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
869 #define BPF_DISPATCHER_PTR(name) NULL
870 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
871 struct bpf_prog *from,
872 struct bpf_prog *to) {}
873 static inline bool is_bpf_image_address(unsigned long address)
877 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
883 struct bpf_func_info_aux {
888 enum bpf_jit_poke_reason {
889 BPF_POKE_REASON_TAIL_CALL,
892 /* Descriptor of pokes pointing /into/ the JITed image. */
893 struct bpf_jit_poke_descriptor {
894 void *tailcall_target;
895 void *tailcall_bypass;
904 bool tailcall_target_stable;
910 /* reg_type info for ctx arguments */
911 struct bpf_ctx_arg_aux {
913 enum bpf_reg_type reg_type;
917 struct btf_mod_pair {
919 struct module *module;
922 struct bpf_kfunc_desc_tab;
924 struct bpf_prog_aux {
933 u32 func_cnt; /* used by non-func prog as the number of func progs */
934 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
935 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
936 u32 ctx_arg_info_size;
937 u32 max_rdonly_access;
939 struct btf *attach_btf;
940 const struct bpf_ctx_arg_aux *ctx_arg_info;
941 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
942 struct bpf_prog *dst_prog;
943 struct bpf_trampoline *dst_trampoline;
944 enum bpf_prog_type saved_dst_prog_type;
945 enum bpf_attach_type saved_dst_attach_type;
946 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
947 bool offload_requested;
948 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
949 bool func_proto_unreliable;
951 bool tail_call_reachable;
953 struct hlist_node tramp_hlist;
954 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
955 const struct btf_type *attach_func_proto;
956 /* function name for valid attach_btf_id */
957 const char *attach_func_name;
958 struct bpf_prog **func;
959 void *jit_data; /* JIT specific data. arch dependent */
960 struct bpf_jit_poke_descriptor *poke_tab;
961 struct bpf_kfunc_desc_tab *kfunc_tab;
962 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
964 struct bpf_ksym ksym;
965 const struct bpf_prog_ops *ops;
966 struct bpf_map **used_maps;
967 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
968 struct btf_mod_pair *used_btfs;
969 struct bpf_prog *prog;
970 struct user_struct *user;
971 u64 load_time; /* ns since boottime */
973 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
974 char name[BPF_OBJ_NAME_LEN];
975 #ifdef CONFIG_SECURITY
978 struct bpf_prog_offload *offload;
980 struct bpf_func_info *func_info;
981 struct bpf_func_info_aux *func_info_aux;
982 /* bpf_line_info loaded from userspace. linfo->insn_off
983 * has the xlated insn offset.
984 * Both the main and sub prog share the same linfo.
985 * The subprog can access its first linfo by
986 * using the linfo_idx.
988 struct bpf_line_info *linfo;
989 /* jited_linfo is the jited addr of the linfo. It has a
990 * one to one mapping to linfo:
991 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
992 * Both the main and sub prog share the same jited_linfo.
993 * The subprog can access its first jited_linfo by
994 * using the linfo_idx.
999 /* subprog can use linfo_idx to access its first linfo and
1001 * main prog always has linfo_idx == 0
1005 struct exception_table_entry *extable;
1007 struct work_struct work;
1008 struct rcu_head rcu;
1012 struct bpf_array_aux {
1013 /* Programs with direct jumps into programs part of this array. */
1014 struct list_head poke_progs;
1015 struct bpf_map *map;
1016 struct mutex poke_mutex;
1017 struct work_struct work;
1023 enum bpf_link_type type;
1024 const struct bpf_link_ops *ops;
1025 struct bpf_prog *prog;
1026 struct work_struct work;
1029 struct bpf_link_ops {
1030 void (*release)(struct bpf_link *link);
1031 void (*dealloc)(struct bpf_link *link);
1032 int (*detach)(struct bpf_link *link);
1033 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1034 struct bpf_prog *old_prog);
1035 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1036 int (*fill_link_info)(const struct bpf_link *link,
1037 struct bpf_link_info *info);
1040 struct bpf_link_primer {
1041 struct bpf_link *link;
1047 struct bpf_struct_ops_value;
1050 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1051 struct bpf_struct_ops {
1052 const struct bpf_verifier_ops *verifier_ops;
1053 int (*init)(struct btf *btf);
1054 int (*check_member)(const struct btf_type *t,
1055 const struct btf_member *member);
1056 int (*init_member)(const struct btf_type *t,
1057 const struct btf_member *member,
1058 void *kdata, const void *udata);
1059 int (*reg)(void *kdata);
1060 void (*unreg)(void *kdata);
1061 const struct btf_type *type;
1062 const struct btf_type *value_type;
1064 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1069 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1070 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1071 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1072 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1073 bool bpf_struct_ops_get(const void *kdata);
1074 void bpf_struct_ops_put(const void *kdata);
1075 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1077 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs,
1078 struct bpf_prog *prog,
1079 const struct btf_func_model *model,
1080 void *image, void *image_end);
1081 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1083 if (owner == BPF_MODULE_OWNER)
1084 return bpf_struct_ops_get(data);
1086 return try_module_get(owner);
1088 static inline void bpf_module_put(const void *data, struct module *owner)
1090 if (owner == BPF_MODULE_OWNER)
1091 bpf_struct_ops_put(data);
1097 /* Define it here to avoid the use of forward declaration */
1098 struct bpf_dummy_ops_state {
1102 struct bpf_dummy_ops {
1103 int (*test_1)(struct bpf_dummy_ops_state *cb);
1104 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1105 char a3, unsigned long a4);
1108 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1109 union bpf_attr __user *uattr);
1112 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1116 static inline void bpf_struct_ops_init(struct btf *btf,
1117 struct bpf_verifier_log *log)
1120 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1122 return try_module_get(owner);
1124 static inline void bpf_module_put(const void *data, struct module *owner)
1128 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1140 struct bpf_array_aux *aux;
1142 char value[0] __aligned(8);
1143 void *ptrs[0] __aligned(8);
1144 void __percpu *pptrs[0] __aligned(8);
1148 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1149 #define MAX_TAIL_CALL_CNT 33
1151 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1152 BPF_F_RDONLY_PROG | \
1156 #define BPF_MAP_CAN_READ BIT(0)
1157 #define BPF_MAP_CAN_WRITE BIT(1)
1159 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1161 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1163 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1166 if (access_flags & BPF_F_RDONLY_PROG)
1167 return BPF_MAP_CAN_READ;
1168 else if (access_flags & BPF_F_WRONLY_PROG)
1169 return BPF_MAP_CAN_WRITE;
1171 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1174 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1176 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1177 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1180 struct bpf_event_entry {
1181 struct perf_event *event;
1182 struct file *perf_file;
1183 struct file *map_file;
1184 struct rcu_head rcu;
1187 static inline bool map_type_contains_progs(struct bpf_map *map)
1189 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1190 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1191 map->map_type == BPF_MAP_TYPE_CPUMAP;
1194 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1195 int bpf_prog_calc_tag(struct bpf_prog *fp);
1197 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1198 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1200 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1201 unsigned long off, unsigned long len);
1202 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1203 const struct bpf_insn *src,
1204 struct bpf_insn *dst,
1205 struct bpf_prog *prog,
1208 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1209 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1211 /* an array of programs to be executed under rcu_lock.
1214 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run);
1216 * the structure returned by bpf_prog_array_alloc() should be populated
1217 * with program pointers and the last pointer must be NULL.
1218 * The user has to keep refcnt on the program and make sure the program
1219 * is removed from the array before bpf_prog_put().
1220 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1221 * since other cpus are walking the array of pointers in parallel.
1223 struct bpf_prog_array_item {
1224 struct bpf_prog *prog;
1226 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1231 struct bpf_prog_array {
1232 struct rcu_head rcu;
1233 struct bpf_prog_array_item items[];
1236 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1237 void bpf_prog_array_free(struct bpf_prog_array *progs);
1238 int bpf_prog_array_length(struct bpf_prog_array *progs);
1239 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1240 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1241 __u32 __user *prog_ids, u32 cnt);
1243 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1244 struct bpf_prog *old_prog);
1245 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1246 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1247 struct bpf_prog *prog);
1248 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1249 u32 *prog_ids, u32 request_cnt,
1251 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1252 struct bpf_prog *exclude_prog,
1253 struct bpf_prog *include_prog,
1255 struct bpf_prog_array **new_array);
1257 struct bpf_run_ctx {};
1259 struct bpf_cg_run_ctx {
1260 struct bpf_run_ctx run_ctx;
1261 const struct bpf_prog_array_item *prog_item;
1265 struct bpf_trace_run_ctx {
1266 struct bpf_run_ctx run_ctx;
1270 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1272 struct bpf_run_ctx *old_ctx = NULL;
1274 #ifdef CONFIG_BPF_SYSCALL
1275 old_ctx = current->bpf_ctx;
1276 current->bpf_ctx = new_ctx;
1281 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1283 #ifdef CONFIG_BPF_SYSCALL
1284 current->bpf_ctx = old_ctx;
1288 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1289 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1290 /* BPF program asks to set CN on the packet. */
1291 #define BPF_RET_SET_CN (1 << 0)
1293 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1295 static __always_inline int
1296 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu,
1297 const void *ctx, bpf_prog_run_fn run_prog,
1298 int retval, u32 *ret_flags)
1300 const struct bpf_prog_array_item *item;
1301 const struct bpf_prog *prog;
1302 const struct bpf_prog_array *array;
1303 struct bpf_run_ctx *old_run_ctx;
1304 struct bpf_cg_run_ctx run_ctx;
1307 run_ctx.retval = retval;
1310 array = rcu_dereference(array_rcu);
1311 item = &array->items[0];
1312 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1313 while ((prog = READ_ONCE(item->prog))) {
1314 run_ctx.prog_item = item;
1315 func_ret = run_prog(prog, ctx);
1316 if (!(func_ret & 1) && !IS_ERR_VALUE((long)run_ctx.retval))
1317 run_ctx.retval = -EPERM;
1318 *(ret_flags) |= (func_ret >> 1);
1321 bpf_reset_run_ctx(old_run_ctx);
1324 return run_ctx.retval;
1327 static __always_inline int
1328 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu,
1329 const void *ctx, bpf_prog_run_fn run_prog,
1332 const struct bpf_prog_array_item *item;
1333 const struct bpf_prog *prog;
1334 const struct bpf_prog_array *array;
1335 struct bpf_run_ctx *old_run_ctx;
1336 struct bpf_cg_run_ctx run_ctx;
1338 run_ctx.retval = retval;
1341 array = rcu_dereference(array_rcu);
1342 item = &array->items[0];
1343 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1344 while ((prog = READ_ONCE(item->prog))) {
1345 run_ctx.prog_item = item;
1346 if (!run_prog(prog, ctx) && !IS_ERR_VALUE((long)run_ctx.retval))
1347 run_ctx.retval = -EPERM;
1350 bpf_reset_run_ctx(old_run_ctx);
1353 return run_ctx.retval;
1356 static __always_inline u32
1357 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu,
1358 const void *ctx, bpf_prog_run_fn run_prog)
1360 const struct bpf_prog_array_item *item;
1361 const struct bpf_prog *prog;
1362 const struct bpf_prog_array *array;
1363 struct bpf_run_ctx *old_run_ctx;
1364 struct bpf_trace_run_ctx run_ctx;
1369 array = rcu_dereference(array_rcu);
1370 if (unlikely(!array))
1372 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1373 item = &array->items[0];
1374 while ((prog = READ_ONCE(item->prog))) {
1375 run_ctx.bpf_cookie = item->bpf_cookie;
1376 ret &= run_prog(prog, ctx);
1379 bpf_reset_run_ctx(old_run_ctx);
1386 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1387 * so BPF programs can request cwr for TCP packets.
1389 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1390 * packet. This macro changes the behavior so the low order bit
1391 * indicates whether the packet should be dropped (0) or not (1)
1392 * and the next bit is a congestion notification bit. This could be
1393 * used by TCP to call tcp_enter_cwr()
1395 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1398 * 2: drop packet and cn
1399 * 3: keep packet and cn
1401 * This macro then converts it to one of the NET_XMIT or an error
1402 * code that is then interpreted as drop packet (and no cn):
1403 * 0: NET_XMIT_SUCCESS skb should be transmitted
1404 * 1: NET_XMIT_DROP skb should be dropped and cn
1405 * 2: NET_XMIT_CN skb should be transmitted and cn
1406 * 3: -err skb should be dropped
1408 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1413 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, 0, &_flags); \
1414 _cn = _flags & BPF_RET_SET_CN; \
1415 if (_ret && !IS_ERR_VALUE((long)_ret)) \
1418 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1420 _ret = (_cn ? NET_XMIT_DROP : _ret); \
1424 #ifdef CONFIG_BPF_SYSCALL
1425 DECLARE_PER_CPU(int, bpf_prog_active);
1426 extern struct mutex bpf_stats_enabled_mutex;
1429 * Block execution of BPF programs attached to instrumentation (perf,
1430 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1431 * these events can happen inside a region which holds a map bucket lock
1432 * and can deadlock on it.
1434 static inline void bpf_disable_instrumentation(void)
1437 this_cpu_inc(bpf_prog_active);
1440 static inline void bpf_enable_instrumentation(void)
1442 this_cpu_dec(bpf_prog_active);
1446 extern const struct file_operations bpf_map_fops;
1447 extern const struct file_operations bpf_prog_fops;
1448 extern const struct file_operations bpf_iter_fops;
1450 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1451 extern const struct bpf_prog_ops _name ## _prog_ops; \
1452 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1453 #define BPF_MAP_TYPE(_id, _ops) \
1454 extern const struct bpf_map_ops _ops;
1455 #define BPF_LINK_TYPE(_id, _name)
1456 #include <linux/bpf_types.h>
1457 #undef BPF_PROG_TYPE
1459 #undef BPF_LINK_TYPE
1461 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1462 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1463 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1465 struct bpf_prog *bpf_prog_get(u32 ufd);
1466 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1468 void bpf_prog_add(struct bpf_prog *prog, int i);
1469 void bpf_prog_sub(struct bpf_prog *prog, int i);
1470 void bpf_prog_inc(struct bpf_prog *prog);
1471 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1472 void bpf_prog_put(struct bpf_prog *prog);
1474 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1475 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1477 struct bpf_map *bpf_map_get(u32 ufd);
1478 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1479 struct bpf_map *__bpf_map_get(struct fd f);
1480 void bpf_map_inc(struct bpf_map *map);
1481 void bpf_map_inc_with_uref(struct bpf_map *map);
1482 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1483 void bpf_map_put_with_uref(struct bpf_map *map);
1484 void bpf_map_put(struct bpf_map *map);
1485 void *bpf_map_area_alloc(u64 size, int numa_node);
1486 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1487 void bpf_map_area_free(void *base);
1488 bool bpf_map_write_active(const struct bpf_map *map);
1489 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1490 int generic_map_lookup_batch(struct bpf_map *map,
1491 const union bpf_attr *attr,
1492 union bpf_attr __user *uattr);
1493 int generic_map_update_batch(struct bpf_map *map,
1494 const union bpf_attr *attr,
1495 union bpf_attr __user *uattr);
1496 int generic_map_delete_batch(struct bpf_map *map,
1497 const union bpf_attr *attr,
1498 union bpf_attr __user *uattr);
1499 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1500 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1502 #ifdef CONFIG_MEMCG_KMEM
1503 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1505 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1506 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1507 size_t align, gfp_t flags);
1509 static inline void *
1510 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1513 return kmalloc_node(size, flags, node);
1516 static inline void *
1517 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1519 return kzalloc(size, flags);
1522 static inline void __percpu *
1523 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
1526 return __alloc_percpu_gfp(size, align, flags);
1530 extern int sysctl_unprivileged_bpf_disabled;
1532 static inline bool bpf_allow_ptr_leaks(void)
1534 return perfmon_capable();
1537 static inline bool bpf_allow_uninit_stack(void)
1539 return perfmon_capable();
1542 static inline bool bpf_allow_ptr_to_map_access(void)
1544 return perfmon_capable();
1547 static inline bool bpf_bypass_spec_v1(void)
1549 return perfmon_capable();
1552 static inline bool bpf_bypass_spec_v4(void)
1554 return perfmon_capable();
1557 int bpf_map_new_fd(struct bpf_map *map, int flags);
1558 int bpf_prog_new_fd(struct bpf_prog *prog);
1560 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1561 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1562 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1563 int bpf_link_settle(struct bpf_link_primer *primer);
1564 void bpf_link_cleanup(struct bpf_link_primer *primer);
1565 void bpf_link_inc(struct bpf_link *link);
1566 void bpf_link_put(struct bpf_link *link);
1567 int bpf_link_new_fd(struct bpf_link *link);
1568 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1569 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1571 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1572 int bpf_obj_get_user(const char __user *pathname, int flags);
1574 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1575 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1576 extern int bpf_iter_ ## target(args); \
1577 int __init bpf_iter_ ## target(args) { return 0; }
1579 struct bpf_iter_aux_info {
1580 struct bpf_map *map;
1583 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1584 union bpf_iter_link_info *linfo,
1585 struct bpf_iter_aux_info *aux);
1586 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1587 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1588 struct seq_file *seq);
1589 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1590 struct bpf_link_info *info);
1591 typedef const struct bpf_func_proto *
1592 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
1593 const struct bpf_prog *prog);
1595 enum bpf_iter_feature {
1596 BPF_ITER_RESCHED = BIT(0),
1599 #define BPF_ITER_CTX_ARG_MAX 2
1600 struct bpf_iter_reg {
1602 bpf_iter_attach_target_t attach_target;
1603 bpf_iter_detach_target_t detach_target;
1604 bpf_iter_show_fdinfo_t show_fdinfo;
1605 bpf_iter_fill_link_info_t fill_link_info;
1606 bpf_iter_get_func_proto_t get_func_proto;
1607 u32 ctx_arg_info_size;
1609 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1610 const struct bpf_iter_seq_info *seq_info;
1613 struct bpf_iter_meta {
1614 __bpf_md_ptr(struct seq_file *, seq);
1619 struct bpf_iter__bpf_map_elem {
1620 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1621 __bpf_md_ptr(struct bpf_map *, map);
1622 __bpf_md_ptr(void *, key);
1623 __bpf_md_ptr(void *, value);
1626 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1627 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1628 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1629 const struct bpf_func_proto *
1630 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
1631 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
1632 int bpf_iter_new_fd(struct bpf_link *link);
1633 bool bpf_link_is_iter(struct bpf_link *link);
1634 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1635 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1636 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1637 struct seq_file *seq);
1638 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1639 struct bpf_link_info *info);
1641 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
1642 struct bpf_func_state *caller,
1643 struct bpf_func_state *callee);
1645 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1646 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1647 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1649 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1652 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1654 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1655 void *key, void *value, u64 map_flags);
1656 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1657 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1658 void *key, void *value, u64 map_flags);
1659 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1661 int bpf_get_file_flag(int flags);
1662 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
1663 size_t actual_size);
1665 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1666 * forced to use 'long' read/writes to try to atomically copy long counters.
1667 * Best-effort only. No barriers here, since it _will_ race with concurrent
1668 * updates from BPF programs. Called from bpf syscall and mostly used with
1669 * size 8 or 16 bytes, so ask compiler to inline it.
1671 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1673 const long *lsrc = src;
1676 size /= sizeof(long);
1681 /* verify correctness of eBPF program */
1682 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
1684 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1685 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1688 struct btf *bpf_get_btf_vmlinux(void);
1693 struct bpf_dtab_netdev;
1694 struct bpf_cpu_map_entry;
1696 void __dev_flush(void);
1697 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
1698 struct net_device *dev_rx);
1699 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
1700 struct net_device *dev_rx);
1701 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
1702 struct bpf_map *map, bool exclude_ingress);
1703 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1704 struct bpf_prog *xdp_prog);
1705 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1706 struct bpf_prog *xdp_prog, struct bpf_map *map,
1707 bool exclude_ingress);
1709 void __cpu_map_flush(void);
1710 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
1711 struct net_device *dev_rx);
1712 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1713 struct sk_buff *skb);
1715 /* Return map's numa specified by userspace */
1716 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1718 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1719 attr->numa_node : NUMA_NO_NODE;
1722 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1723 int array_map_alloc_check(union bpf_attr *attr);
1725 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1726 union bpf_attr __user *uattr);
1727 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1728 union bpf_attr __user *uattr);
1729 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1730 const union bpf_attr *kattr,
1731 union bpf_attr __user *uattr);
1732 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1733 const union bpf_attr *kattr,
1734 union bpf_attr __user *uattr);
1735 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1736 const union bpf_attr *kattr,
1737 union bpf_attr __user *uattr);
1738 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1739 const union bpf_attr *kattr,
1740 union bpf_attr __user *uattr);
1741 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1742 const struct bpf_prog *prog,
1743 struct bpf_insn_access_aux *info);
1745 static inline bool bpf_tracing_ctx_access(int off, int size,
1746 enum bpf_access_type type)
1748 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
1750 if (type != BPF_READ)
1752 if (off % size != 0)
1757 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
1758 enum bpf_access_type type,
1759 const struct bpf_prog *prog,
1760 struct bpf_insn_access_aux *info)
1762 if (!bpf_tracing_ctx_access(off, size, type))
1764 return btf_ctx_access(off, size, type, prog, info);
1767 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf,
1768 const struct btf_type *t, int off, int size,
1769 enum bpf_access_type atype,
1771 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1772 const struct btf *btf, u32 id, int off,
1773 const struct btf *need_btf, u32 need_type_id);
1775 int btf_distill_func_proto(struct bpf_verifier_log *log,
1777 const struct btf_type *func_proto,
1778 const char *func_name,
1779 struct btf_func_model *m);
1781 struct bpf_reg_state;
1782 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
1783 struct bpf_reg_state *regs);
1784 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
1785 const struct btf *btf, u32 func_id,
1786 struct bpf_reg_state *regs);
1787 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1788 struct bpf_reg_state *reg);
1789 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1790 struct btf *btf, const struct btf_type *t);
1792 struct bpf_prog *bpf_prog_by_id(u32 id);
1793 struct bpf_link *bpf_link_by_id(u32 id);
1795 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1796 void bpf_task_storage_free(struct task_struct *task);
1797 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
1798 const struct btf_func_model *
1799 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1800 const struct bpf_insn *insn);
1801 struct bpf_core_ctx {
1802 struct bpf_verifier_log *log;
1803 const struct btf *btf;
1806 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
1807 int relo_idx, void *insn);
1809 #else /* !CONFIG_BPF_SYSCALL */
1810 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1812 return ERR_PTR(-EOPNOTSUPP);
1815 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1816 enum bpf_prog_type type,
1819 return ERR_PTR(-EOPNOTSUPP);
1822 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1826 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1830 static inline void bpf_prog_put(struct bpf_prog *prog)
1834 static inline void bpf_prog_inc(struct bpf_prog *prog)
1838 static inline struct bpf_prog *__must_check
1839 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1841 return ERR_PTR(-EOPNOTSUPP);
1844 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1845 const struct bpf_link_ops *ops,
1846 struct bpf_prog *prog)
1850 static inline int bpf_link_prime(struct bpf_link *link,
1851 struct bpf_link_primer *primer)
1856 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1861 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1865 static inline void bpf_link_inc(struct bpf_link *link)
1869 static inline void bpf_link_put(struct bpf_link *link)
1873 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1878 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1883 static inline void __dev_flush(void)
1888 struct bpf_dtab_netdev;
1889 struct bpf_cpu_map_entry;
1892 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
1893 struct net_device *dev_rx)
1899 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
1900 struct net_device *dev_rx)
1906 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
1907 struct bpf_map *map, bool exclude_ingress)
1914 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1915 struct sk_buff *skb,
1916 struct bpf_prog *xdp_prog)
1922 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1923 struct bpf_prog *xdp_prog, struct bpf_map *map,
1924 bool exclude_ingress)
1929 static inline void __cpu_map_flush(void)
1933 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1934 struct xdp_frame *xdpf,
1935 struct net_device *dev_rx)
1940 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1941 struct sk_buff *skb)
1946 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1951 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1952 enum bpf_prog_type type)
1954 return ERR_PTR(-EOPNOTSUPP);
1957 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1958 const union bpf_attr *kattr,
1959 union bpf_attr __user *uattr)
1964 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1965 const union bpf_attr *kattr,
1966 union bpf_attr __user *uattr)
1971 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1972 const union bpf_attr *kattr,
1973 union bpf_attr __user *uattr)
1978 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1979 const union bpf_attr *kattr,
1980 union bpf_attr __user *uattr)
1985 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1986 const union bpf_attr *kattr,
1987 union bpf_attr __user *uattr)
1992 static inline void bpf_map_put(struct bpf_map *map)
1996 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1998 return ERR_PTR(-ENOTSUPP);
2001 static inline const struct bpf_func_proto *
2002 bpf_base_func_proto(enum bpf_func_id func_id)
2007 static inline void bpf_task_storage_free(struct task_struct *task)
2011 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2016 static inline const struct btf_func_model *
2017 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2018 const struct bpf_insn *insn)
2022 #endif /* CONFIG_BPF_SYSCALL */
2024 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2025 struct btf_mod_pair *used_btfs, u32 len);
2027 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2028 enum bpf_prog_type type)
2030 return bpf_prog_get_type_dev(ufd, type, false);
2033 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2034 struct bpf_map **used_maps, u32 len);
2036 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2038 int bpf_prog_offload_compile(struct bpf_prog *prog);
2039 void bpf_prog_offload_destroy(struct bpf_prog *prog);
2040 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2041 struct bpf_prog *prog);
2043 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2045 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2046 int bpf_map_offload_update_elem(struct bpf_map *map,
2047 void *key, void *value, u64 flags);
2048 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2049 int bpf_map_offload_get_next_key(struct bpf_map *map,
2050 void *key, void *next_key);
2052 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2054 struct bpf_offload_dev *
2055 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2056 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2057 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2058 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2059 struct net_device *netdev);
2060 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2061 struct net_device *netdev);
2062 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2064 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2065 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
2067 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2069 return aux->offload_requested;
2072 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2074 return unlikely(map->ops == &bpf_map_offload_ops);
2077 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2078 void bpf_map_offload_map_free(struct bpf_map *map);
2079 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2080 const union bpf_attr *kattr,
2081 union bpf_attr __user *uattr);
2083 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2084 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2085 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2086 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2087 union bpf_attr __user *uattr);
2089 void sock_map_unhash(struct sock *sk);
2090 void sock_map_close(struct sock *sk, long timeout);
2092 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
2093 union bpf_attr *attr)
2098 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
2103 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2108 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2110 return ERR_PTR(-EOPNOTSUPP);
2113 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2117 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2118 const union bpf_attr *kattr,
2119 union bpf_attr __user *uattr)
2124 #ifdef CONFIG_BPF_SYSCALL
2125 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2126 struct bpf_prog *prog)
2131 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2132 enum bpf_prog_type ptype)
2137 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2143 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2144 union bpf_attr __user *uattr)
2148 #endif /* CONFIG_BPF_SYSCALL */
2149 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2151 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2152 void bpf_sk_reuseport_detach(struct sock *sk);
2153 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2155 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2156 void *value, u64 map_flags);
2158 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2162 #ifdef CONFIG_BPF_SYSCALL
2163 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2164 void *key, void *value)
2169 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2170 void *key, void *value,
2175 #endif /* CONFIG_BPF_SYSCALL */
2176 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2178 /* verifier prototypes for helper functions called from eBPF programs */
2179 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2180 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2181 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2182 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2183 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2184 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2186 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2187 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2188 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2189 extern const struct bpf_func_proto bpf_tail_call_proto;
2190 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2191 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2192 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2193 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2194 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2195 extern const struct bpf_func_proto bpf_get_stackid_proto;
2196 extern const struct bpf_func_proto bpf_get_stack_proto;
2197 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2198 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2199 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2200 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2201 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2202 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2203 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2204 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2205 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2206 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2207 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2208 extern const struct bpf_func_proto bpf_spin_lock_proto;
2209 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2210 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2211 extern const struct bpf_func_proto bpf_strtol_proto;
2212 extern const struct bpf_func_proto bpf_strtoul_proto;
2213 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2214 extern const struct bpf_func_proto bpf_jiffies64_proto;
2215 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2216 extern const struct bpf_func_proto bpf_event_output_data_proto;
2217 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2218 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2219 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2220 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2221 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2222 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2223 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2224 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2225 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2226 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2227 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
2228 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2229 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2230 extern const struct bpf_func_proto bpf_snprintf_proto;
2231 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2232 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2233 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2234 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2235 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2236 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2237 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2238 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2239 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2240 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2241 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2242 extern const struct bpf_func_proto bpf_kallsyms_lookup_name_proto;
2243 extern const struct bpf_func_proto bpf_find_vma_proto;
2244 extern const struct bpf_func_proto bpf_loop_proto;
2245 extern const struct bpf_func_proto bpf_strncmp_proto;
2247 const struct bpf_func_proto *tracing_prog_func_proto(
2248 enum bpf_func_id func_id, const struct bpf_prog *prog);
2250 /* Shared helpers among cBPF and eBPF. */
2251 void bpf_user_rnd_init_once(void);
2252 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2253 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2255 #if defined(CONFIG_NET)
2256 bool bpf_sock_common_is_valid_access(int off, int size,
2257 enum bpf_access_type type,
2258 struct bpf_insn_access_aux *info);
2259 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2260 struct bpf_insn_access_aux *info);
2261 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2262 const struct bpf_insn *si,
2263 struct bpf_insn *insn_buf,
2264 struct bpf_prog *prog,
2267 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2268 enum bpf_access_type type,
2269 struct bpf_insn_access_aux *info)
2273 static inline bool bpf_sock_is_valid_access(int off, int size,
2274 enum bpf_access_type type,
2275 struct bpf_insn_access_aux *info)
2279 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2280 const struct bpf_insn *si,
2281 struct bpf_insn *insn_buf,
2282 struct bpf_prog *prog,
2290 struct sk_reuseport_kern {
2291 struct sk_buff *skb;
2293 struct sock *selected_sk;
2294 struct sock *migrating_sk;
2300 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2301 struct bpf_insn_access_aux *info);
2303 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2304 const struct bpf_insn *si,
2305 struct bpf_insn *insn_buf,
2306 struct bpf_prog *prog,
2309 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2310 struct bpf_insn_access_aux *info);
2312 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2313 const struct bpf_insn *si,
2314 struct bpf_insn *insn_buf,
2315 struct bpf_prog *prog,
2318 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2319 enum bpf_access_type type,
2320 struct bpf_insn_access_aux *info)
2325 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2326 const struct bpf_insn *si,
2327 struct bpf_insn *insn_buf,
2328 struct bpf_prog *prog,
2333 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2334 enum bpf_access_type type,
2335 struct bpf_insn_access_aux *info)
2340 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2341 const struct bpf_insn *si,
2342 struct bpf_insn *insn_buf,
2343 struct bpf_prog *prog,
2348 #endif /* CONFIG_INET */
2350 enum bpf_text_poke_type {
2355 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2356 void *addr1, void *addr2);
2359 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2361 #define MAX_BPRINTF_VARARGS 12
2363 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2364 u32 **bin_buf, u32 num_args);
2365 void bpf_bprintf_cleanup(void);
2367 #endif /* _LINUX_BPF_H */