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;
199 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
201 return map->spin_lock_off >= 0;
204 static inline bool map_value_has_timer(const struct bpf_map *map)
206 return map->timer_off >= 0;
209 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
211 if (unlikely(map_value_has_spin_lock(map)))
212 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
213 (struct bpf_spin_lock){};
214 if (unlikely(map_value_has_timer(map)))
215 *(struct bpf_timer *)(dst + map->timer_off) =
216 (struct bpf_timer){};
219 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */
220 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
222 u32 s_off = 0, s_sz = 0, t_off = 0, t_sz = 0;
224 if (unlikely(map_value_has_spin_lock(map))) {
225 s_off = map->spin_lock_off;
226 s_sz = sizeof(struct bpf_spin_lock);
227 } else if (unlikely(map_value_has_timer(map))) {
228 t_off = map->timer_off;
229 t_sz = sizeof(struct bpf_timer);
232 if (unlikely(s_sz || t_sz)) {
233 if (s_off < t_off || !s_sz) {
237 memcpy(dst, src, t_off);
238 memcpy(dst + t_off + t_sz,
240 s_off - t_off - t_sz);
241 memcpy(dst + s_off + s_sz,
243 map->value_size - s_off - s_sz);
245 memcpy(dst, src, map->value_size);
248 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
250 void bpf_timer_cancel_and_free(void *timer);
251 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
253 struct bpf_offload_dev;
254 struct bpf_offloaded_map;
256 struct bpf_map_dev_ops {
257 int (*map_get_next_key)(struct bpf_offloaded_map *map,
258 void *key, void *next_key);
259 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
260 void *key, void *value);
261 int (*map_update_elem)(struct bpf_offloaded_map *map,
262 void *key, void *value, u64 flags);
263 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
266 struct bpf_offloaded_map {
268 struct net_device *netdev;
269 const struct bpf_map_dev_ops *dev_ops;
271 struct list_head offloads;
274 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
276 return container_of(map, struct bpf_offloaded_map, map);
279 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
281 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
284 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
286 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
287 map->ops->map_seq_show_elem;
290 int map_check_no_btf(const struct bpf_map *map,
291 const struct btf *btf,
292 const struct btf_type *key_type,
293 const struct btf_type *value_type);
295 bool bpf_map_meta_equal(const struct bpf_map *meta0,
296 const struct bpf_map *meta1);
298 extern const struct bpf_map_ops bpf_map_offload_ops;
300 /* bpf_type_flag contains a set of flags that are applicable to the values of
301 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
302 * or a memory is read-only. We classify types into two categories: base types
303 * and extended types. Extended types are base types combined with a type flag.
305 * Currently there are no more than 32 base types in arg_type, ret_type and
308 #define BPF_BASE_TYPE_BITS 8
311 /* PTR may be NULL. */
312 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
314 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
315 * compatible with both mutable and immutable memory.
317 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
319 /* MEM was "allocated" from a different helper, and cannot be mixed
320 * with regular non-MEM_ALLOC'ed MEM types.
322 MEM_ALLOC = BIT(2 + BPF_BASE_TYPE_BITS),
324 __BPF_TYPE_LAST_FLAG = MEM_ALLOC,
327 /* Max number of base types. */
328 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
330 /* Max number of all types. */
331 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
333 /* function argument constraints */
335 ARG_DONTCARE = 0, /* unused argument in helper function */
337 /* the following constraints used to prototype
338 * bpf_map_lookup/update/delete_elem() functions
340 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
341 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
342 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
343 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
345 /* the following constraints used to prototype bpf_memcmp() and other
346 * functions that access data on eBPF program stack
348 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
349 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
350 * helper function must fill all bytes or clear
351 * them in error case.
354 ARG_CONST_SIZE, /* number of bytes accessed from memory */
355 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
357 ARG_PTR_TO_CTX, /* pointer to context */
358 ARG_ANYTHING, /* any (initialized) argument is ok */
359 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
360 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
361 ARG_PTR_TO_INT, /* pointer to int */
362 ARG_PTR_TO_LONG, /* pointer to long */
363 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
364 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
365 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
366 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
367 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
368 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
369 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
370 ARG_PTR_TO_STACK, /* pointer to stack */
371 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
372 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
375 /* Extended arg_types. */
376 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
377 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
378 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
379 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
380 ARG_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM,
381 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
383 /* This must be the last entry. Its purpose is to ensure the enum is
384 * wide enough to hold the higher bits reserved for bpf_type_flag.
386 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
388 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
390 /* type of values returned from helper functions */
391 enum bpf_return_type {
392 RET_INTEGER, /* function returns integer */
393 RET_VOID, /* function doesn't return anything */
394 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
395 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
396 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
397 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
398 RET_PTR_TO_ALLOC_MEM, /* returns a pointer to dynamically allocated memory */
399 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
400 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
403 /* Extended ret_types. */
404 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
405 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
406 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
407 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
408 RET_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_ALLOC | RET_PTR_TO_ALLOC_MEM,
409 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
411 /* This must be the last entry. Its purpose is to ensure the enum is
412 * wide enough to hold the higher bits reserved for bpf_type_flag.
414 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
416 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
418 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
419 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
420 * instructions after verifying
422 struct bpf_func_proto {
423 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
426 enum bpf_return_type ret_type;
429 enum bpf_arg_type arg1_type;
430 enum bpf_arg_type arg2_type;
431 enum bpf_arg_type arg3_type;
432 enum bpf_arg_type arg4_type;
433 enum bpf_arg_type arg5_type;
435 enum bpf_arg_type arg_type[5];
447 int *ret_btf_id; /* return value btf_id */
448 bool (*allowed)(const struct bpf_prog *prog);
451 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
452 * the first argument to eBPF programs.
453 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
457 enum bpf_access_type {
462 /* types of values stored in eBPF registers */
463 /* Pointer types represent:
466 * pointer + (u16) var
467 * pointer + (u16) var + imm
468 * if (range > 0) then [ptr, ptr + range - off) is safe to access
469 * if (id > 0) means that some 'var' was added
470 * if (off > 0) means that 'imm' was added
473 NOT_INIT = 0, /* nothing was written into register */
474 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
475 PTR_TO_CTX, /* reg points to bpf_context */
476 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
477 PTR_TO_MAP_VALUE, /* reg points to map element value */
478 PTR_TO_MAP_KEY, /* reg points to a map element key */
479 PTR_TO_STACK, /* reg == frame_pointer + offset */
480 PTR_TO_PACKET_META, /* skb->data - meta_len */
481 PTR_TO_PACKET, /* reg points to skb->data */
482 PTR_TO_PACKET_END, /* skb->data + headlen */
483 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
484 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
485 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
486 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
487 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
488 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
489 /* PTR_TO_BTF_ID points to a kernel struct that does not need
490 * to be null checked by the BPF program. This does not imply the
491 * pointer is _not_ null and in practice this can easily be a null
492 * pointer when reading pointer chains. The assumption is program
493 * context will handle null pointer dereference typically via fault
494 * handling. The verifier must keep this in mind and can make no
495 * assumptions about null or non-null when doing branch analysis.
496 * Further, when passed into helpers the helpers can not, without
497 * additional context, assume the value is non-null.
500 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
501 * been checked for null. Used primarily to inform the verifier
502 * an explicit null check is required for this struct.
504 PTR_TO_MEM, /* reg points to valid memory region */
505 PTR_TO_BUF, /* reg points to a read/write buffer */
506 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */
507 PTR_TO_FUNC, /* reg points to a bpf program function */
510 /* Extended reg_types. */
511 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
512 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
513 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
514 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
515 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
517 /* This must be the last entry. Its purpose is to ensure the enum is
518 * wide enough to hold the higher bits reserved for bpf_type_flag.
520 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
522 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
524 /* The information passed from prog-specific *_is_valid_access
525 * back to the verifier.
527 struct bpf_insn_access_aux {
528 enum bpf_reg_type reg_type;
536 struct bpf_verifier_log *log; /* for verbose logs */
540 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
542 aux->ctx_field_size = size;
545 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
547 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
548 insn->src_reg == BPF_PSEUDO_FUNC;
551 struct bpf_prog_ops {
552 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
553 union bpf_attr __user *uattr);
556 struct bpf_verifier_ops {
557 /* return eBPF function prototype for verification */
558 const struct bpf_func_proto *
559 (*get_func_proto)(enum bpf_func_id func_id,
560 const struct bpf_prog *prog);
562 /* return true if 'size' wide access at offset 'off' within bpf_context
563 * with 'type' (read or write) is allowed
565 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
566 const struct bpf_prog *prog,
567 struct bpf_insn_access_aux *info);
568 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
569 const struct bpf_prog *prog);
570 int (*gen_ld_abs)(const struct bpf_insn *orig,
571 struct bpf_insn *insn_buf);
572 u32 (*convert_ctx_access)(enum bpf_access_type type,
573 const struct bpf_insn *src,
574 struct bpf_insn *dst,
575 struct bpf_prog *prog, u32 *target_size);
576 int (*btf_struct_access)(struct bpf_verifier_log *log,
577 const struct btf *btf,
578 const struct btf_type *t, int off, int size,
579 enum bpf_access_type atype,
581 bool (*check_kfunc_call)(u32 kfunc_btf_id, struct module *owner);
584 struct bpf_prog_offload_ops {
585 /* verifier basic callbacks */
586 int (*insn_hook)(struct bpf_verifier_env *env,
587 int insn_idx, int prev_insn_idx);
588 int (*finalize)(struct bpf_verifier_env *env);
589 /* verifier optimization callbacks (called after .finalize) */
590 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
591 struct bpf_insn *insn);
592 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
593 /* program management callbacks */
594 int (*prepare)(struct bpf_prog *prog);
595 int (*translate)(struct bpf_prog *prog);
596 void (*destroy)(struct bpf_prog *prog);
599 struct bpf_prog_offload {
600 struct bpf_prog *prog;
601 struct net_device *netdev;
602 struct bpf_offload_dev *offdev;
604 struct list_head offloads;
611 enum bpf_cgroup_storage_type {
612 BPF_CGROUP_STORAGE_SHARED,
613 BPF_CGROUP_STORAGE_PERCPU,
614 __BPF_CGROUP_STORAGE_MAX
617 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
619 /* The longest tracepoint has 12 args.
620 * See include/trace/bpf_probe.h
622 #define MAX_BPF_FUNC_ARGS 12
624 /* The maximum number of arguments passed through registers
625 * a single function may have.
627 #define MAX_BPF_FUNC_REG_ARGS 5
629 struct btf_func_model {
632 u8 arg_size[MAX_BPF_FUNC_ARGS];
635 /* Restore arguments before returning from trampoline to let original function
636 * continue executing. This flag is used for fentry progs when there are no
639 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
640 /* Call original function after fentry progs, but before fexit progs.
641 * Makes sense for fentry/fexit, normal calls and indirect calls.
643 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
644 /* Skip current frame and return to parent. Makes sense for fentry/fexit
645 * programs only. Should not be used with normal calls and indirect calls.
647 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
648 /* Store IP address of the caller on the trampoline stack,
649 * so it's available for trampoline's programs.
651 #define BPF_TRAMP_F_IP_ARG BIT(3)
652 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
653 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
655 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
656 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
658 #define BPF_MAX_TRAMP_PROGS 38
660 struct bpf_tramp_progs {
661 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
665 /* Different use cases for BPF trampoline:
666 * 1. replace nop at the function entry (kprobe equivalent)
667 * flags = BPF_TRAMP_F_RESTORE_REGS
668 * fentry = a set of programs to run before returning from trampoline
670 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
671 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
672 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
673 * fentry = a set of program to run before calling original function
674 * fexit = a set of program to run after original function
676 * 3. replace direct call instruction anywhere in the function body
677 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
679 * fentry = a set of programs to run before returning from trampoline
680 * With flags = BPF_TRAMP_F_CALL_ORIG
681 * orig_call = original callback addr or direct function addr
682 * fentry = a set of program to run before calling original function
683 * fexit = a set of program to run after original function
685 struct bpf_tramp_image;
686 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
687 const struct btf_func_model *m, u32 flags,
688 struct bpf_tramp_progs *tprogs,
690 /* these two functions are called from generated trampoline */
691 u64 notrace __bpf_prog_enter(struct bpf_prog *prog);
692 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
693 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog);
694 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start);
695 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
696 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
701 char name[KSYM_NAME_LEN];
702 struct list_head lnode;
703 struct latch_tree_node tnode;
707 enum bpf_tramp_prog_type {
710 BPF_TRAMP_MODIFY_RETURN,
712 BPF_TRAMP_REPLACE, /* more than MAX */
715 struct bpf_tramp_image {
717 struct bpf_ksym ksym;
718 struct percpu_ref pcref;
723 struct work_struct work;
727 struct bpf_trampoline {
728 /* hlist for trampoline_table */
729 struct hlist_node hlist;
730 /* serializes access to fields of this trampoline */
735 struct btf_func_model model;
739 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
740 * program by replacing one of its functions. func.addr is the address
741 * of the function it replaced.
743 struct bpf_prog *extension_prog;
744 /* list of BPF programs using this trampoline */
745 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
746 /* Number of attached programs. A counter per kind. */
747 int progs_cnt[BPF_TRAMP_MAX];
748 /* Executable image of trampoline */
749 struct bpf_tramp_image *cur_image;
754 struct bpf_attach_target_info {
755 struct btf_func_model fmodel;
757 const char *tgt_name;
758 const struct btf_type *tgt_type;
761 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
763 struct bpf_dispatcher_prog {
764 struct bpf_prog *prog;
768 struct bpf_dispatcher {
769 /* dispatcher mutex */
772 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
776 struct bpf_ksym ksym;
779 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
781 const struct bpf_insn *insnsi,
782 unsigned int (*bpf_func)(const void *,
783 const struct bpf_insn *))
785 return bpf_func(ctx, insnsi);
787 #ifdef CONFIG_BPF_JIT
788 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
789 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
790 struct bpf_trampoline *bpf_trampoline_get(u64 key,
791 struct bpf_attach_target_info *tgt_info);
792 void bpf_trampoline_put(struct bpf_trampoline *tr);
793 int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
794 #define BPF_DISPATCHER_INIT(_name) { \
795 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
796 .func = &_name##_func, \
803 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
807 #define DEFINE_BPF_DISPATCHER(name) \
808 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
810 const struct bpf_insn *insnsi, \
811 unsigned int (*bpf_func)(const void *, \
812 const struct bpf_insn *)) \
814 return bpf_func(ctx, insnsi); \
816 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
817 struct bpf_dispatcher bpf_dispatcher_##name = \
818 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
819 #define DECLARE_BPF_DISPATCHER(name) \
820 unsigned int bpf_dispatcher_##name##_func( \
822 const struct bpf_insn *insnsi, \
823 unsigned int (*bpf_func)(const void *, \
824 const struct bpf_insn *)); \
825 extern struct bpf_dispatcher bpf_dispatcher_##name;
826 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
827 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
828 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
829 struct bpf_prog *to);
830 /* Called only from JIT-enabled code, so there's no need for stubs. */
831 void *bpf_jit_alloc_exec_page(void);
832 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
833 void bpf_image_ksym_del(struct bpf_ksym *ksym);
834 void bpf_ksym_add(struct bpf_ksym *ksym);
835 void bpf_ksym_del(struct bpf_ksym *ksym);
836 int bpf_jit_charge_modmem(u32 pages);
837 void bpf_jit_uncharge_modmem(u32 pages);
838 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
840 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
841 struct bpf_trampoline *tr)
845 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
846 struct bpf_trampoline *tr)
850 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
851 struct bpf_attach_target_info *tgt_info)
853 return ERR_PTR(-EOPNOTSUPP);
855 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
856 #define DEFINE_BPF_DISPATCHER(name)
857 #define DECLARE_BPF_DISPATCHER(name)
858 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
859 #define BPF_DISPATCHER_PTR(name) NULL
860 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
861 struct bpf_prog *from,
862 struct bpf_prog *to) {}
863 static inline bool is_bpf_image_address(unsigned long address)
867 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
873 struct bpf_func_info_aux {
878 enum bpf_jit_poke_reason {
879 BPF_POKE_REASON_TAIL_CALL,
882 /* Descriptor of pokes pointing /into/ the JITed image. */
883 struct bpf_jit_poke_descriptor {
884 void *tailcall_target;
885 void *tailcall_bypass;
894 bool tailcall_target_stable;
900 /* reg_type info for ctx arguments */
901 struct bpf_ctx_arg_aux {
903 enum bpf_reg_type reg_type;
907 struct btf_mod_pair {
909 struct module *module;
912 struct bpf_kfunc_desc_tab;
914 struct bpf_prog_aux {
923 u32 func_cnt; /* used by non-func prog as the number of func progs */
924 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
925 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
926 u32 ctx_arg_info_size;
927 u32 max_rdonly_access;
929 struct btf *attach_btf;
930 const struct bpf_ctx_arg_aux *ctx_arg_info;
931 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
932 struct bpf_prog *dst_prog;
933 struct bpf_trampoline *dst_trampoline;
934 enum bpf_prog_type saved_dst_prog_type;
935 enum bpf_attach_type saved_dst_attach_type;
936 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
937 bool offload_requested;
938 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
939 bool func_proto_unreliable;
941 bool tail_call_reachable;
942 struct hlist_node tramp_hlist;
943 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
944 const struct btf_type *attach_func_proto;
945 /* function name for valid attach_btf_id */
946 const char *attach_func_name;
947 struct bpf_prog **func;
948 void *jit_data; /* JIT specific data. arch dependent */
949 struct bpf_jit_poke_descriptor *poke_tab;
950 struct bpf_kfunc_desc_tab *kfunc_tab;
951 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
953 struct bpf_ksym ksym;
954 const struct bpf_prog_ops *ops;
955 struct bpf_map **used_maps;
956 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
957 struct btf_mod_pair *used_btfs;
958 struct bpf_prog *prog;
959 struct user_struct *user;
960 u64 load_time; /* ns since boottime */
962 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
963 char name[BPF_OBJ_NAME_LEN];
964 #ifdef CONFIG_SECURITY
967 struct bpf_prog_offload *offload;
969 struct bpf_func_info *func_info;
970 struct bpf_func_info_aux *func_info_aux;
971 /* bpf_line_info loaded from userspace. linfo->insn_off
972 * has the xlated insn offset.
973 * Both the main and sub prog share the same linfo.
974 * The subprog can access its first linfo by
975 * using the linfo_idx.
977 struct bpf_line_info *linfo;
978 /* jited_linfo is the jited addr of the linfo. It has a
979 * one to one mapping to linfo:
980 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
981 * Both the main and sub prog share the same jited_linfo.
982 * The subprog can access its first jited_linfo by
983 * using the linfo_idx.
988 /* subprog can use linfo_idx to access its first linfo and
990 * main prog always has linfo_idx == 0
994 struct exception_table_entry *extable;
996 struct work_struct work;
1001 struct bpf_array_aux {
1002 /* 'Ownership' of prog array is claimed by the first program that
1003 * is going to use this map or by the first program which FD is
1004 * stored in the map to make sure that all callers and callees have
1005 * the same prog type and JITed flag.
1009 enum bpf_prog_type type;
1012 /* Programs with direct jumps into programs part of this array. */
1013 struct list_head poke_progs;
1014 struct bpf_map *map;
1015 struct mutex poke_mutex;
1016 struct work_struct work;
1022 enum bpf_link_type type;
1023 const struct bpf_link_ops *ops;
1024 struct bpf_prog *prog;
1025 struct work_struct work;
1028 struct bpf_link_ops {
1029 void (*release)(struct bpf_link *link);
1030 void (*dealloc)(struct bpf_link *link);
1031 int (*detach)(struct bpf_link *link);
1032 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1033 struct bpf_prog *old_prog);
1034 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1035 int (*fill_link_info)(const struct bpf_link *link,
1036 struct bpf_link_info *info);
1039 struct bpf_link_primer {
1040 struct bpf_link *link;
1046 struct bpf_struct_ops_value;
1049 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1050 struct bpf_struct_ops {
1051 const struct bpf_verifier_ops *verifier_ops;
1052 int (*init)(struct btf *btf);
1053 int (*check_member)(const struct btf_type *t,
1054 const struct btf_member *member);
1055 int (*init_member)(const struct btf_type *t,
1056 const struct btf_member *member,
1057 void *kdata, const void *udata);
1058 int (*reg)(void *kdata);
1059 void (*unreg)(void *kdata);
1060 const struct btf_type *type;
1061 const struct btf_type *value_type;
1063 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1068 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1069 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1070 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1071 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1072 bool bpf_struct_ops_get(const void *kdata);
1073 void bpf_struct_ops_put(const void *kdata);
1074 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1076 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs,
1077 struct bpf_prog *prog,
1078 const struct btf_func_model *model,
1079 void *image, void *image_end);
1080 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1082 if (owner == BPF_MODULE_OWNER)
1083 return bpf_struct_ops_get(data);
1085 return try_module_get(owner);
1087 static inline void bpf_module_put(const void *data, struct module *owner)
1089 if (owner == BPF_MODULE_OWNER)
1090 bpf_struct_ops_put(data);
1096 /* Define it here to avoid the use of forward declaration */
1097 struct bpf_dummy_ops_state {
1101 struct bpf_dummy_ops {
1102 int (*test_1)(struct bpf_dummy_ops_state *cb);
1103 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1104 char a3, unsigned long a4);
1107 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1108 union bpf_attr __user *uattr);
1111 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1115 static inline void bpf_struct_ops_init(struct btf *btf,
1116 struct bpf_verifier_log *log)
1119 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1121 return try_module_get(owner);
1123 static inline void bpf_module_put(const void *data, struct module *owner)
1127 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1139 struct bpf_array_aux *aux;
1141 char value[0] __aligned(8);
1142 void *ptrs[0] __aligned(8);
1143 void __percpu *pptrs[0] __aligned(8);
1147 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1148 #define MAX_TAIL_CALL_CNT 33
1150 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1151 BPF_F_RDONLY_PROG | \
1155 #define BPF_MAP_CAN_READ BIT(0)
1156 #define BPF_MAP_CAN_WRITE BIT(1)
1158 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1160 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1162 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1165 if (access_flags & BPF_F_RDONLY_PROG)
1166 return BPF_MAP_CAN_READ;
1167 else if (access_flags & BPF_F_WRONLY_PROG)
1168 return BPF_MAP_CAN_WRITE;
1170 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1173 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1175 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1176 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1179 struct bpf_event_entry {
1180 struct perf_event *event;
1181 struct file *perf_file;
1182 struct file *map_file;
1183 struct rcu_head rcu;
1186 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
1187 int bpf_prog_calc_tag(struct bpf_prog *fp);
1189 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1190 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1192 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1193 unsigned long off, unsigned long len);
1194 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1195 const struct bpf_insn *src,
1196 struct bpf_insn *dst,
1197 struct bpf_prog *prog,
1200 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1201 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1203 /* an array of programs to be executed under rcu_lock.
1206 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run);
1208 * the structure returned by bpf_prog_array_alloc() should be populated
1209 * with program pointers and the last pointer must be NULL.
1210 * The user has to keep refcnt on the program and make sure the program
1211 * is removed from the array before bpf_prog_put().
1212 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1213 * since other cpus are walking the array of pointers in parallel.
1215 struct bpf_prog_array_item {
1216 struct bpf_prog *prog;
1218 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1223 struct bpf_prog_array {
1224 struct rcu_head rcu;
1225 struct bpf_prog_array_item items[];
1228 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1229 void bpf_prog_array_free(struct bpf_prog_array *progs);
1230 int bpf_prog_array_length(struct bpf_prog_array *progs);
1231 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1232 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1233 __u32 __user *prog_ids, u32 cnt);
1235 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1236 struct bpf_prog *old_prog);
1237 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1238 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1239 struct bpf_prog *prog);
1240 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1241 u32 *prog_ids, u32 request_cnt,
1243 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1244 struct bpf_prog *exclude_prog,
1245 struct bpf_prog *include_prog,
1247 struct bpf_prog_array **new_array);
1249 struct bpf_run_ctx {};
1251 struct bpf_cg_run_ctx {
1252 struct bpf_run_ctx run_ctx;
1253 const struct bpf_prog_array_item *prog_item;
1256 struct bpf_trace_run_ctx {
1257 struct bpf_run_ctx run_ctx;
1261 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1263 struct bpf_run_ctx *old_ctx = NULL;
1265 #ifdef CONFIG_BPF_SYSCALL
1266 old_ctx = current->bpf_ctx;
1267 current->bpf_ctx = new_ctx;
1272 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1274 #ifdef CONFIG_BPF_SYSCALL
1275 current->bpf_ctx = old_ctx;
1279 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1280 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1281 /* BPF program asks to set CN on the packet. */
1282 #define BPF_RET_SET_CN (1 << 0)
1284 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1286 static __always_inline u32
1287 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu,
1288 const void *ctx, bpf_prog_run_fn run_prog,
1291 const struct bpf_prog_array_item *item;
1292 const struct bpf_prog *prog;
1293 const struct bpf_prog_array *array;
1294 struct bpf_run_ctx *old_run_ctx;
1295 struct bpf_cg_run_ctx run_ctx;
1301 array = rcu_dereference(array_rcu);
1302 item = &array->items[0];
1303 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1304 while ((prog = READ_ONCE(item->prog))) {
1305 run_ctx.prog_item = item;
1306 func_ret = run_prog(prog, ctx);
1307 ret &= (func_ret & 1);
1308 *(ret_flags) |= (func_ret >> 1);
1311 bpf_reset_run_ctx(old_run_ctx);
1317 static __always_inline u32
1318 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu,
1319 const void *ctx, bpf_prog_run_fn run_prog)
1321 const struct bpf_prog_array_item *item;
1322 const struct bpf_prog *prog;
1323 const struct bpf_prog_array *array;
1324 struct bpf_run_ctx *old_run_ctx;
1325 struct bpf_cg_run_ctx run_ctx;
1330 array = rcu_dereference(array_rcu);
1331 item = &array->items[0];
1332 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1333 while ((prog = READ_ONCE(item->prog))) {
1334 run_ctx.prog_item = item;
1335 ret &= run_prog(prog, ctx);
1338 bpf_reset_run_ctx(old_run_ctx);
1344 static __always_inline u32
1345 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu,
1346 const void *ctx, bpf_prog_run_fn run_prog)
1348 const struct bpf_prog_array_item *item;
1349 const struct bpf_prog *prog;
1350 const struct bpf_prog_array *array;
1351 struct bpf_run_ctx *old_run_ctx;
1352 struct bpf_trace_run_ctx run_ctx;
1357 array = rcu_dereference(array_rcu);
1358 if (unlikely(!array))
1360 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1361 item = &array->items[0];
1362 while ((prog = READ_ONCE(item->prog))) {
1363 run_ctx.bpf_cookie = item->bpf_cookie;
1364 ret &= run_prog(prog, ctx);
1367 bpf_reset_run_ctx(old_run_ctx);
1374 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1375 * so BPF programs can request cwr for TCP packets.
1377 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1378 * packet. This macro changes the behavior so the low order bit
1379 * indicates whether the packet should be dropped (0) or not (1)
1380 * and the next bit is a congestion notification bit. This could be
1381 * used by TCP to call tcp_enter_cwr()
1383 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1386 * 2: drop packet and cn
1387 * 3: keep packet and cn
1389 * This macro then converts it to one of the NET_XMIT or an error
1390 * code that is then interpreted as drop packet (and no cn):
1391 * 0: NET_XMIT_SUCCESS skb should be transmitted
1392 * 1: NET_XMIT_DROP skb should be dropped and cn
1393 * 2: NET_XMIT_CN skb should be transmitted and cn
1394 * 3: -EPERM skb should be dropped
1396 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1401 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, &_flags); \
1402 _cn = _flags & BPF_RET_SET_CN; \
1404 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1406 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1410 #ifdef CONFIG_BPF_SYSCALL
1411 DECLARE_PER_CPU(int, bpf_prog_active);
1412 extern struct mutex bpf_stats_enabled_mutex;
1415 * Block execution of BPF programs attached to instrumentation (perf,
1416 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1417 * these events can happen inside a region which holds a map bucket lock
1418 * and can deadlock on it.
1420 static inline void bpf_disable_instrumentation(void)
1423 this_cpu_inc(bpf_prog_active);
1426 static inline void bpf_enable_instrumentation(void)
1428 this_cpu_dec(bpf_prog_active);
1432 extern const struct file_operations bpf_map_fops;
1433 extern const struct file_operations bpf_prog_fops;
1434 extern const struct file_operations bpf_iter_fops;
1436 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1437 extern const struct bpf_prog_ops _name ## _prog_ops; \
1438 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1439 #define BPF_MAP_TYPE(_id, _ops) \
1440 extern const struct bpf_map_ops _ops;
1441 #define BPF_LINK_TYPE(_id, _name)
1442 #include <linux/bpf_types.h>
1443 #undef BPF_PROG_TYPE
1445 #undef BPF_LINK_TYPE
1447 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1448 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1449 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1451 struct bpf_prog *bpf_prog_get(u32 ufd);
1452 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1454 void bpf_prog_add(struct bpf_prog *prog, int i);
1455 void bpf_prog_sub(struct bpf_prog *prog, int i);
1456 void bpf_prog_inc(struct bpf_prog *prog);
1457 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1458 void bpf_prog_put(struct bpf_prog *prog);
1460 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1461 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1463 struct bpf_map *bpf_map_get(u32 ufd);
1464 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1465 struct bpf_map *__bpf_map_get(struct fd f);
1466 void bpf_map_inc(struct bpf_map *map);
1467 void bpf_map_inc_with_uref(struct bpf_map *map);
1468 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1469 void bpf_map_put_with_uref(struct bpf_map *map);
1470 void bpf_map_put(struct bpf_map *map);
1471 void *bpf_map_area_alloc(u64 size, int numa_node);
1472 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1473 void bpf_map_area_free(void *base);
1474 bool bpf_map_write_active(const struct bpf_map *map);
1475 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1476 int generic_map_lookup_batch(struct bpf_map *map,
1477 const union bpf_attr *attr,
1478 union bpf_attr __user *uattr);
1479 int generic_map_update_batch(struct bpf_map *map,
1480 const union bpf_attr *attr,
1481 union bpf_attr __user *uattr);
1482 int generic_map_delete_batch(struct bpf_map *map,
1483 const union bpf_attr *attr,
1484 union bpf_attr __user *uattr);
1485 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1486 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1488 #ifdef CONFIG_MEMCG_KMEM
1489 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1491 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1492 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1493 size_t align, gfp_t flags);
1495 static inline void *
1496 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1499 return kmalloc_node(size, flags, node);
1502 static inline void *
1503 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1505 return kzalloc(size, flags);
1508 static inline void __percpu *
1509 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
1512 return __alloc_percpu_gfp(size, align, flags);
1516 extern int sysctl_unprivileged_bpf_disabled;
1518 static inline bool bpf_allow_ptr_leaks(void)
1520 return perfmon_capable();
1523 static inline bool bpf_allow_uninit_stack(void)
1525 return perfmon_capable();
1528 static inline bool bpf_allow_ptr_to_map_access(void)
1530 return perfmon_capable();
1533 static inline bool bpf_bypass_spec_v1(void)
1535 return perfmon_capable();
1538 static inline bool bpf_bypass_spec_v4(void)
1540 return perfmon_capable();
1543 int bpf_map_new_fd(struct bpf_map *map, int flags);
1544 int bpf_prog_new_fd(struct bpf_prog *prog);
1546 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1547 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1548 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1549 int bpf_link_settle(struct bpf_link_primer *primer);
1550 void bpf_link_cleanup(struct bpf_link_primer *primer);
1551 void bpf_link_inc(struct bpf_link *link);
1552 void bpf_link_put(struct bpf_link *link);
1553 int bpf_link_new_fd(struct bpf_link *link);
1554 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1555 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1557 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1558 int bpf_obj_get_user(const char __user *pathname, int flags);
1560 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1561 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1562 extern int bpf_iter_ ## target(args); \
1563 int __init bpf_iter_ ## target(args) { return 0; }
1565 struct bpf_iter_aux_info {
1566 struct bpf_map *map;
1569 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1570 union bpf_iter_link_info *linfo,
1571 struct bpf_iter_aux_info *aux);
1572 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1573 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1574 struct seq_file *seq);
1575 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1576 struct bpf_link_info *info);
1577 typedef const struct bpf_func_proto *
1578 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
1579 const struct bpf_prog *prog);
1581 enum bpf_iter_feature {
1582 BPF_ITER_RESCHED = BIT(0),
1585 #define BPF_ITER_CTX_ARG_MAX 2
1586 struct bpf_iter_reg {
1588 bpf_iter_attach_target_t attach_target;
1589 bpf_iter_detach_target_t detach_target;
1590 bpf_iter_show_fdinfo_t show_fdinfo;
1591 bpf_iter_fill_link_info_t fill_link_info;
1592 bpf_iter_get_func_proto_t get_func_proto;
1593 u32 ctx_arg_info_size;
1595 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1596 const struct bpf_iter_seq_info *seq_info;
1599 struct bpf_iter_meta {
1600 __bpf_md_ptr(struct seq_file *, seq);
1605 struct bpf_iter__bpf_map_elem {
1606 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1607 __bpf_md_ptr(struct bpf_map *, map);
1608 __bpf_md_ptr(void *, key);
1609 __bpf_md_ptr(void *, value);
1612 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1613 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1614 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1615 const struct bpf_func_proto *
1616 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
1617 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
1618 int bpf_iter_new_fd(struct bpf_link *link);
1619 bool bpf_link_is_iter(struct bpf_link *link);
1620 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1621 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1622 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1623 struct seq_file *seq);
1624 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1625 struct bpf_link_info *info);
1627 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
1628 struct bpf_func_state *caller,
1629 struct bpf_func_state *callee);
1631 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1632 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1633 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1635 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1638 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1640 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1641 void *key, void *value, u64 map_flags);
1642 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1643 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1644 void *key, void *value, u64 map_flags);
1645 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1647 int bpf_get_file_flag(int flags);
1648 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
1649 size_t actual_size);
1651 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1652 * forced to use 'long' read/writes to try to atomically copy long counters.
1653 * Best-effort only. No barriers here, since it _will_ race with concurrent
1654 * updates from BPF programs. Called from bpf syscall and mostly used with
1655 * size 8 or 16 bytes, so ask compiler to inline it.
1657 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1659 const long *lsrc = src;
1662 size /= sizeof(long);
1667 /* verify correctness of eBPF program */
1668 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
1670 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1671 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1674 struct btf *bpf_get_btf_vmlinux(void);
1679 struct bpf_dtab_netdev;
1680 struct bpf_cpu_map_entry;
1682 void __dev_flush(void);
1683 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
1684 struct net_device *dev_rx);
1685 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
1686 struct net_device *dev_rx);
1687 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
1688 struct bpf_map *map, bool exclude_ingress);
1689 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1690 struct bpf_prog *xdp_prog);
1691 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1692 struct bpf_prog *xdp_prog, struct bpf_map *map,
1693 bool exclude_ingress);
1695 void __cpu_map_flush(void);
1696 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
1697 struct net_device *dev_rx);
1698 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1699 struct sk_buff *skb);
1701 /* Return map's numa specified by userspace */
1702 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1704 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1705 attr->numa_node : NUMA_NO_NODE;
1708 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1709 int array_map_alloc_check(union bpf_attr *attr);
1711 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1712 union bpf_attr __user *uattr);
1713 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1714 union bpf_attr __user *uattr);
1715 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1716 const union bpf_attr *kattr,
1717 union bpf_attr __user *uattr);
1718 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1719 const union bpf_attr *kattr,
1720 union bpf_attr __user *uattr);
1721 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1722 const union bpf_attr *kattr,
1723 union bpf_attr __user *uattr);
1724 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1725 const union bpf_attr *kattr,
1726 union bpf_attr __user *uattr);
1727 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id, struct module *owner);
1728 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1729 const struct bpf_prog *prog,
1730 struct bpf_insn_access_aux *info);
1732 static inline bool bpf_tracing_ctx_access(int off, int size,
1733 enum bpf_access_type type)
1735 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
1737 if (type != BPF_READ)
1739 if (off % size != 0)
1744 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
1745 enum bpf_access_type type,
1746 const struct bpf_prog *prog,
1747 struct bpf_insn_access_aux *info)
1749 if (!bpf_tracing_ctx_access(off, size, type))
1751 return btf_ctx_access(off, size, type, prog, info);
1754 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf,
1755 const struct btf_type *t, int off, int size,
1756 enum bpf_access_type atype,
1758 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1759 const struct btf *btf, u32 id, int off,
1760 const struct btf *need_btf, u32 need_type_id);
1762 int btf_distill_func_proto(struct bpf_verifier_log *log,
1764 const struct btf_type *func_proto,
1765 const char *func_name,
1766 struct btf_func_model *m);
1768 struct bpf_reg_state;
1769 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
1770 struct bpf_reg_state *regs);
1771 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
1772 const struct btf *btf, u32 func_id,
1773 struct bpf_reg_state *regs);
1774 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1775 struct bpf_reg_state *reg);
1776 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1777 struct btf *btf, const struct btf_type *t);
1779 struct bpf_prog *bpf_prog_by_id(u32 id);
1780 struct bpf_link *bpf_link_by_id(u32 id);
1782 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1783 void bpf_task_storage_free(struct task_struct *task);
1784 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
1785 const struct btf_func_model *
1786 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1787 const struct bpf_insn *insn);
1788 struct bpf_core_ctx {
1789 struct bpf_verifier_log *log;
1790 const struct btf *btf;
1793 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
1794 int relo_idx, void *insn);
1796 #else /* !CONFIG_BPF_SYSCALL */
1797 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1799 return ERR_PTR(-EOPNOTSUPP);
1802 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1803 enum bpf_prog_type type,
1806 return ERR_PTR(-EOPNOTSUPP);
1809 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1813 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1817 static inline void bpf_prog_put(struct bpf_prog *prog)
1821 static inline void bpf_prog_inc(struct bpf_prog *prog)
1825 static inline struct bpf_prog *__must_check
1826 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1828 return ERR_PTR(-EOPNOTSUPP);
1831 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1832 const struct bpf_link_ops *ops,
1833 struct bpf_prog *prog)
1837 static inline int bpf_link_prime(struct bpf_link *link,
1838 struct bpf_link_primer *primer)
1843 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1848 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1852 static inline void bpf_link_inc(struct bpf_link *link)
1856 static inline void bpf_link_put(struct bpf_link *link)
1860 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1865 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1870 static inline void __dev_flush(void)
1875 struct bpf_dtab_netdev;
1876 struct bpf_cpu_map_entry;
1879 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
1880 struct net_device *dev_rx)
1886 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
1887 struct net_device *dev_rx)
1893 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
1894 struct bpf_map *map, bool exclude_ingress)
1901 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1902 struct sk_buff *skb,
1903 struct bpf_prog *xdp_prog)
1909 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1910 struct bpf_prog *xdp_prog, struct bpf_map *map,
1911 bool exclude_ingress)
1916 static inline void __cpu_map_flush(void)
1920 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1921 struct xdp_frame *xdpf,
1922 struct net_device *dev_rx)
1927 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1928 struct sk_buff *skb)
1933 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1938 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1939 enum bpf_prog_type type)
1941 return ERR_PTR(-EOPNOTSUPP);
1944 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1945 const union bpf_attr *kattr,
1946 union bpf_attr __user *uattr)
1951 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1952 const union bpf_attr *kattr,
1953 union bpf_attr __user *uattr)
1958 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1959 const union bpf_attr *kattr,
1960 union bpf_attr __user *uattr)
1965 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1966 const union bpf_attr *kattr,
1967 union bpf_attr __user *uattr)
1972 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1973 const union bpf_attr *kattr,
1974 union bpf_attr __user *uattr)
1979 static inline bool bpf_prog_test_check_kfunc_call(u32 kfunc_id,
1980 struct module *owner)
1985 static inline void bpf_map_put(struct bpf_map *map)
1989 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1991 return ERR_PTR(-ENOTSUPP);
1994 static inline const struct bpf_func_proto *
1995 bpf_base_func_proto(enum bpf_func_id func_id)
2000 static inline void bpf_task_storage_free(struct task_struct *task)
2004 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2009 static inline const struct btf_func_model *
2010 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2011 const struct bpf_insn *insn)
2015 #endif /* CONFIG_BPF_SYSCALL */
2017 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2018 struct btf_mod_pair *used_btfs, u32 len);
2020 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2021 enum bpf_prog_type type)
2023 return bpf_prog_get_type_dev(ufd, type, false);
2026 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2027 struct bpf_map **used_maps, u32 len);
2029 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2031 int bpf_prog_offload_compile(struct bpf_prog *prog);
2032 void bpf_prog_offload_destroy(struct bpf_prog *prog);
2033 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2034 struct bpf_prog *prog);
2036 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2038 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2039 int bpf_map_offload_update_elem(struct bpf_map *map,
2040 void *key, void *value, u64 flags);
2041 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2042 int bpf_map_offload_get_next_key(struct bpf_map *map,
2043 void *key, void *next_key);
2045 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2047 struct bpf_offload_dev *
2048 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2049 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2050 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2051 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2052 struct net_device *netdev);
2053 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2054 struct net_device *netdev);
2055 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2057 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2058 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
2060 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2062 return aux->offload_requested;
2065 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2067 return unlikely(map->ops == &bpf_map_offload_ops);
2070 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2071 void bpf_map_offload_map_free(struct bpf_map *map);
2072 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2073 const union bpf_attr *kattr,
2074 union bpf_attr __user *uattr);
2076 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2077 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2078 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2079 void sock_map_unhash(struct sock *sk);
2080 void sock_map_close(struct sock *sk, long timeout);
2082 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
2083 union bpf_attr *attr)
2088 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
2093 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2098 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2100 return ERR_PTR(-EOPNOTSUPP);
2103 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2107 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2108 const union bpf_attr *kattr,
2109 union bpf_attr __user *uattr)
2114 #ifdef CONFIG_BPF_SYSCALL
2115 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2116 struct bpf_prog *prog)
2121 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2122 enum bpf_prog_type ptype)
2127 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2132 #endif /* CONFIG_BPF_SYSCALL */
2133 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2135 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2136 void bpf_sk_reuseport_detach(struct sock *sk);
2137 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2139 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2140 void *value, u64 map_flags);
2142 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2146 #ifdef CONFIG_BPF_SYSCALL
2147 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2148 void *key, void *value)
2153 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2154 void *key, void *value,
2159 #endif /* CONFIG_BPF_SYSCALL */
2160 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2162 /* verifier prototypes for helper functions called from eBPF programs */
2163 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2164 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2165 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2166 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2167 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2168 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2170 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2171 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2172 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2173 extern const struct bpf_func_proto bpf_tail_call_proto;
2174 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2175 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2176 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2177 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2178 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2179 extern const struct bpf_func_proto bpf_get_stackid_proto;
2180 extern const struct bpf_func_proto bpf_get_stack_proto;
2181 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2182 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2183 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2184 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2185 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2186 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2187 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2188 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2189 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2190 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2191 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2192 extern const struct bpf_func_proto bpf_spin_lock_proto;
2193 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2194 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2195 extern const struct bpf_func_proto bpf_strtol_proto;
2196 extern const struct bpf_func_proto bpf_strtoul_proto;
2197 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2198 extern const struct bpf_func_proto bpf_jiffies64_proto;
2199 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2200 extern const struct bpf_func_proto bpf_event_output_data_proto;
2201 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2202 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2203 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2204 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2205 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2206 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2207 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2208 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2209 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2210 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2211 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
2212 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2213 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2214 extern const struct bpf_func_proto bpf_snprintf_proto;
2215 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2216 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2217 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2218 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2219 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2220 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2221 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2222 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2223 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2224 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2225 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2226 extern const struct bpf_func_proto bpf_kallsyms_lookup_name_proto;
2227 extern const struct bpf_func_proto bpf_find_vma_proto;
2228 extern const struct bpf_func_proto bpf_loop_proto;
2229 extern const struct bpf_func_proto bpf_strncmp_proto;
2231 const struct bpf_func_proto *tracing_prog_func_proto(
2232 enum bpf_func_id func_id, const struct bpf_prog *prog);
2234 /* Shared helpers among cBPF and eBPF. */
2235 void bpf_user_rnd_init_once(void);
2236 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2237 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2239 #if defined(CONFIG_NET)
2240 bool bpf_sock_common_is_valid_access(int off, int size,
2241 enum bpf_access_type type,
2242 struct bpf_insn_access_aux *info);
2243 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2244 struct bpf_insn_access_aux *info);
2245 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2246 const struct bpf_insn *si,
2247 struct bpf_insn *insn_buf,
2248 struct bpf_prog *prog,
2251 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2252 enum bpf_access_type type,
2253 struct bpf_insn_access_aux *info)
2257 static inline bool bpf_sock_is_valid_access(int off, int size,
2258 enum bpf_access_type type,
2259 struct bpf_insn_access_aux *info)
2263 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2264 const struct bpf_insn *si,
2265 struct bpf_insn *insn_buf,
2266 struct bpf_prog *prog,
2274 struct sk_reuseport_kern {
2275 struct sk_buff *skb;
2277 struct sock *selected_sk;
2278 struct sock *migrating_sk;
2284 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2285 struct bpf_insn_access_aux *info);
2287 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2288 const struct bpf_insn *si,
2289 struct bpf_insn *insn_buf,
2290 struct bpf_prog *prog,
2293 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2294 struct bpf_insn_access_aux *info);
2296 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2297 const struct bpf_insn *si,
2298 struct bpf_insn *insn_buf,
2299 struct bpf_prog *prog,
2302 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2303 enum bpf_access_type type,
2304 struct bpf_insn_access_aux *info)
2309 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2310 const struct bpf_insn *si,
2311 struct bpf_insn *insn_buf,
2312 struct bpf_prog *prog,
2317 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2318 enum bpf_access_type type,
2319 struct bpf_insn_access_aux *info)
2324 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2325 const struct bpf_insn *si,
2326 struct bpf_insn *insn_buf,
2327 struct bpf_prog *prog,
2332 #endif /* CONFIG_INET */
2334 enum bpf_text_poke_type {
2339 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2340 void *addr1, void *addr2);
2343 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2345 #define MAX_BPRINTF_VARARGS 12
2347 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2348 u32 **bin_buf, u32 num_args);
2349 void bpf_bprintf_cleanup(void);
2351 #endif /* _LINUX_BPF_H */