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 int (*bpf_iter_init_seq_priv_t)(void *private_data,
52 struct bpf_iter_aux_info *aux);
53 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
54 struct bpf_iter_seq_info {
55 const struct seq_operations *seq_ops;
56 bpf_iter_init_seq_priv_t init_seq_private;
57 bpf_iter_fini_seq_priv_t fini_seq_private;
61 /* map is generic key/value storage optionally accessible by eBPF programs */
63 /* funcs callable from userspace (via syscall) */
64 int (*map_alloc_check)(union bpf_attr *attr);
65 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
66 void (*map_release)(struct bpf_map *map, struct file *map_file);
67 void (*map_free)(struct bpf_map *map);
68 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
69 void (*map_release_uref)(struct bpf_map *map);
70 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
71 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
72 union bpf_attr __user *uattr);
73 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
74 void *value, u64 flags);
75 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
76 const union bpf_attr *attr,
77 union bpf_attr __user *uattr);
78 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
79 union bpf_attr __user *uattr);
80 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
81 union bpf_attr __user *uattr);
83 /* funcs callable from userspace and from eBPF programs */
84 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
85 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
86 int (*map_delete_elem)(struct bpf_map *map, void *key);
87 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
88 int (*map_pop_elem)(struct bpf_map *map, void *value);
89 int (*map_peek_elem)(struct bpf_map *map, void *value);
91 /* funcs called by prog_array and perf_event_array map */
92 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
94 void (*map_fd_put_ptr)(void *ptr);
95 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
96 u32 (*map_fd_sys_lookup_elem)(void *ptr);
97 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
99 int (*map_check_btf)(const struct bpf_map *map,
100 const struct btf *btf,
101 const struct btf_type *key_type,
102 const struct btf_type *value_type);
104 /* Prog poke tracking helpers. */
105 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
106 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
107 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
108 struct bpf_prog *new);
110 /* Direct value access helpers. */
111 int (*map_direct_value_addr)(const struct bpf_map *map,
113 int (*map_direct_value_meta)(const struct bpf_map *map,
115 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
116 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
117 struct poll_table_struct *pts);
119 /* Functions called by bpf_local_storage maps */
120 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
121 void *owner, u32 size);
122 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
123 void *owner, u32 size);
124 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
127 int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags);
129 /* map_meta_equal must be implemented for maps that can be
130 * used as an inner map. It is a runtime check to ensure
131 * an inner map can be inserted to an outer map.
133 * Some properties of the inner map has been used during the
134 * verification time. When inserting an inner map at the runtime,
135 * map_meta_equal has to ensure the inserting map has the same
136 * properties that the verifier has used earlier.
138 bool (*map_meta_equal)(const struct bpf_map *meta0,
139 const struct bpf_map *meta1);
142 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
143 struct bpf_func_state *caller,
144 struct bpf_func_state *callee);
145 int (*map_for_each_callback)(struct bpf_map *map, void *callback_fn,
146 void *callback_ctx, u64 flags);
148 /* BTF name and id of struct allocated by map_alloc */
149 const char * const map_btf_name;
152 /* bpf_iter info used to open a seq_file */
153 const struct bpf_iter_seq_info *iter_seq_info;
157 /* The first two cachelines with read-mostly members of which some
158 * are also accessed in fast-path (e.g. ops, max_entries).
160 const struct bpf_map_ops *ops ____cacheline_aligned;
161 struct bpf_map *inner_map_meta;
162 #ifdef CONFIG_SECURITY
165 enum bpf_map_type map_type;
170 int spin_lock_off; /* >=0 valid offset, <0 error */
171 int timer_off; /* >=0 valid offset, <0 error */
175 u32 btf_value_type_id;
177 #ifdef CONFIG_MEMCG_KMEM
178 struct mem_cgroup *memcg;
180 char name[BPF_OBJ_NAME_LEN];
181 u32 btf_vmlinux_value_type_id;
183 bool frozen; /* write-once; write-protected by freeze_mutex */
186 /* The 3rd and 4th cacheline with misc members to avoid false sharing
187 * particularly with refcounting.
189 atomic64_t refcnt ____cacheline_aligned;
191 struct work_struct work;
192 struct mutex freeze_mutex;
193 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
196 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
198 return map->spin_lock_off >= 0;
201 static inline bool map_value_has_timer(const struct bpf_map *map)
203 return map->timer_off >= 0;
206 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
208 if (unlikely(map_value_has_spin_lock(map)))
209 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
210 (struct bpf_spin_lock){};
211 if (unlikely(map_value_has_timer(map)))
212 *(struct bpf_timer *)(dst + map->timer_off) =
213 (struct bpf_timer){};
216 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */
217 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
219 u32 s_off = 0, s_sz = 0, t_off = 0, t_sz = 0;
221 if (unlikely(map_value_has_spin_lock(map))) {
222 s_off = map->spin_lock_off;
223 s_sz = sizeof(struct bpf_spin_lock);
224 } else if (unlikely(map_value_has_timer(map))) {
225 t_off = map->timer_off;
226 t_sz = sizeof(struct bpf_timer);
229 if (unlikely(s_sz || t_sz)) {
230 if (s_off < t_off || !s_sz) {
234 memcpy(dst, src, t_off);
235 memcpy(dst + t_off + t_sz,
237 s_off - t_off - t_sz);
238 memcpy(dst + s_off + s_sz,
240 map->value_size - s_off - s_sz);
242 memcpy(dst, src, map->value_size);
245 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
247 void bpf_timer_cancel_and_free(void *timer);
248 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
250 struct bpf_offload_dev;
251 struct bpf_offloaded_map;
253 struct bpf_map_dev_ops {
254 int (*map_get_next_key)(struct bpf_offloaded_map *map,
255 void *key, void *next_key);
256 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
257 void *key, void *value);
258 int (*map_update_elem)(struct bpf_offloaded_map *map,
259 void *key, void *value, u64 flags);
260 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
263 struct bpf_offloaded_map {
265 struct net_device *netdev;
266 const struct bpf_map_dev_ops *dev_ops;
268 struct list_head offloads;
271 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
273 return container_of(map, struct bpf_offloaded_map, map);
276 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
278 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
281 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
283 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
284 map->ops->map_seq_show_elem;
287 int map_check_no_btf(const struct bpf_map *map,
288 const struct btf *btf,
289 const struct btf_type *key_type,
290 const struct btf_type *value_type);
292 bool bpf_map_meta_equal(const struct bpf_map *meta0,
293 const struct bpf_map *meta1);
295 extern const struct bpf_map_ops bpf_map_offload_ops;
297 /* function argument constraints */
299 ARG_DONTCARE = 0, /* unused argument in helper function */
301 /* the following constraints used to prototype
302 * bpf_map_lookup/update/delete_elem() functions
304 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
305 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
306 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
307 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
308 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */
310 /* the following constraints used to prototype bpf_memcmp() and other
311 * functions that access data on eBPF program stack
313 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
314 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
315 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
316 * helper function must fill all bytes or clear
317 * them in error case.
320 ARG_CONST_SIZE, /* number of bytes accessed from memory */
321 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
323 ARG_PTR_TO_CTX, /* pointer to context */
324 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
325 ARG_ANYTHING, /* any (initialized) argument is ok */
326 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
327 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
328 ARG_PTR_TO_INT, /* pointer to int */
329 ARG_PTR_TO_LONG, /* pointer to long */
330 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
331 ARG_PTR_TO_SOCKET_OR_NULL, /* pointer to bpf_sock (fullsock) or NULL */
332 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
333 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
334 ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */
335 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
336 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
337 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
338 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
339 ARG_PTR_TO_STACK_OR_NULL, /* pointer to stack or NULL */
340 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
341 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
345 /* type of values returned from helper functions */
346 enum bpf_return_type {
347 RET_INTEGER, /* function returns integer */
348 RET_VOID, /* function doesn't return anything */
349 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
350 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
351 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */
352 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */
353 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
354 RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */
355 RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */
356 RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, /* returns a pointer to a valid memory or a btf_id or NULL */
357 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
358 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
361 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
362 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
363 * instructions after verifying
365 struct bpf_func_proto {
366 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
369 enum bpf_return_type ret_type;
372 enum bpf_arg_type arg1_type;
373 enum bpf_arg_type arg2_type;
374 enum bpf_arg_type arg3_type;
375 enum bpf_arg_type arg4_type;
376 enum bpf_arg_type arg5_type;
378 enum bpf_arg_type arg_type[5];
390 int *ret_btf_id; /* return value btf_id */
391 bool (*allowed)(const struct bpf_prog *prog);
394 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
395 * the first argument to eBPF programs.
396 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
400 enum bpf_access_type {
405 /* types of values stored in eBPF registers */
406 /* Pointer types represent:
409 * pointer + (u16) var
410 * pointer + (u16) var + imm
411 * if (range > 0) then [ptr, ptr + range - off) is safe to access
412 * if (id > 0) means that some 'var' was added
413 * if (off > 0) means that 'imm' was added
416 NOT_INIT = 0, /* nothing was written into register */
417 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
418 PTR_TO_CTX, /* reg points to bpf_context */
419 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
420 PTR_TO_MAP_VALUE, /* reg points to map element value */
421 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
422 PTR_TO_STACK, /* reg == frame_pointer + offset */
423 PTR_TO_PACKET_META, /* skb->data - meta_len */
424 PTR_TO_PACKET, /* reg points to skb->data */
425 PTR_TO_PACKET_END, /* skb->data + headlen */
426 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
427 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
428 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */
429 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
430 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
431 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
432 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
433 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
434 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
435 /* PTR_TO_BTF_ID points to a kernel struct that does not need
436 * to be null checked by the BPF program. This does not imply the
437 * pointer is _not_ null and in practice this can easily be a null
438 * pointer when reading pointer chains. The assumption is program
439 * context will handle null pointer dereference typically via fault
440 * handling. The verifier must keep this in mind and can make no
441 * assumptions about null or non-null when doing branch analysis.
442 * Further, when passed into helpers the helpers can not, without
443 * additional context, assume the value is non-null.
446 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
447 * been checked for null. Used primarily to inform the verifier
448 * an explicit null check is required for this struct.
450 PTR_TO_BTF_ID_OR_NULL,
451 PTR_TO_MEM, /* reg points to valid memory region */
452 PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */
453 PTR_TO_RDONLY_BUF, /* reg points to a readonly buffer */
454 PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */
455 PTR_TO_RDWR_BUF, /* reg points to a read/write buffer */
456 PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */
457 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */
458 PTR_TO_FUNC, /* reg points to a bpf program function */
459 PTR_TO_MAP_KEY, /* reg points to a map element key */
463 /* The information passed from prog-specific *_is_valid_access
464 * back to the verifier.
466 struct bpf_insn_access_aux {
467 enum bpf_reg_type reg_type;
475 struct bpf_verifier_log *log; /* for verbose logs */
479 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
481 aux->ctx_field_size = size;
484 struct bpf_prog_ops {
485 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
486 union bpf_attr __user *uattr);
489 struct bpf_verifier_ops {
490 /* return eBPF function prototype for verification */
491 const struct bpf_func_proto *
492 (*get_func_proto)(enum bpf_func_id func_id,
493 const struct bpf_prog *prog);
495 /* return true if 'size' wide access at offset 'off' within bpf_context
496 * with 'type' (read or write) is allowed
498 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
499 const struct bpf_prog *prog,
500 struct bpf_insn_access_aux *info);
501 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
502 const struct bpf_prog *prog);
503 int (*gen_ld_abs)(const struct bpf_insn *orig,
504 struct bpf_insn *insn_buf);
505 u32 (*convert_ctx_access)(enum bpf_access_type type,
506 const struct bpf_insn *src,
507 struct bpf_insn *dst,
508 struct bpf_prog *prog, u32 *target_size);
509 int (*btf_struct_access)(struct bpf_verifier_log *log,
510 const struct btf *btf,
511 const struct btf_type *t, int off, int size,
512 enum bpf_access_type atype,
514 bool (*check_kfunc_call)(u32 kfunc_btf_id);
517 struct bpf_prog_offload_ops {
518 /* verifier basic callbacks */
519 int (*insn_hook)(struct bpf_verifier_env *env,
520 int insn_idx, int prev_insn_idx);
521 int (*finalize)(struct bpf_verifier_env *env);
522 /* verifier optimization callbacks (called after .finalize) */
523 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
524 struct bpf_insn *insn);
525 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
526 /* program management callbacks */
527 int (*prepare)(struct bpf_prog *prog);
528 int (*translate)(struct bpf_prog *prog);
529 void (*destroy)(struct bpf_prog *prog);
532 struct bpf_prog_offload {
533 struct bpf_prog *prog;
534 struct net_device *netdev;
535 struct bpf_offload_dev *offdev;
537 struct list_head offloads;
544 enum bpf_cgroup_storage_type {
545 BPF_CGROUP_STORAGE_SHARED,
546 BPF_CGROUP_STORAGE_PERCPU,
547 __BPF_CGROUP_STORAGE_MAX
550 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
552 /* The longest tracepoint has 12 args.
553 * See include/trace/bpf_probe.h
555 #define MAX_BPF_FUNC_ARGS 12
557 /* The maximum number of arguments passed through registers
558 * a single function may have.
560 #define MAX_BPF_FUNC_REG_ARGS 5
562 struct btf_func_model {
565 u8 arg_size[MAX_BPF_FUNC_ARGS];
568 /* Restore arguments before returning from trampoline to let original function
569 * continue executing. This flag is used for fentry progs when there are no
572 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
573 /* Call original function after fentry progs, but before fexit progs.
574 * Makes sense for fentry/fexit, normal calls and indirect calls.
576 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
577 /* Skip current frame and return to parent. Makes sense for fentry/fexit
578 * programs only. Should not be used with normal calls and indirect calls.
580 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
581 /* Store IP address of the caller on the trampoline stack,
582 * so it's available for trampoline's programs.
584 #define BPF_TRAMP_F_IP_ARG BIT(3)
585 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
586 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
588 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
589 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
591 #define BPF_MAX_TRAMP_PROGS 38
593 struct bpf_tramp_progs {
594 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
598 /* Different use cases for BPF trampoline:
599 * 1. replace nop at the function entry (kprobe equivalent)
600 * flags = BPF_TRAMP_F_RESTORE_REGS
601 * fentry = a set of programs to run before returning from trampoline
603 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
604 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
605 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
606 * fentry = a set of program to run before calling original function
607 * fexit = a set of program to run after original function
609 * 3. replace direct call instruction anywhere in the function body
610 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
612 * fentry = a set of programs to run before returning from trampoline
613 * With flags = BPF_TRAMP_F_CALL_ORIG
614 * orig_call = original callback addr or direct function addr
615 * fentry = a set of program to run before calling original function
616 * fexit = a set of program to run after original function
618 struct bpf_tramp_image;
619 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
620 const struct btf_func_model *m, u32 flags,
621 struct bpf_tramp_progs *tprogs,
623 /* these two functions are called from generated trampoline */
624 u64 notrace __bpf_prog_enter(struct bpf_prog *prog);
625 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
626 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog);
627 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start);
628 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
629 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
634 char name[KSYM_NAME_LEN];
635 struct list_head lnode;
636 struct latch_tree_node tnode;
640 enum bpf_tramp_prog_type {
643 BPF_TRAMP_MODIFY_RETURN,
645 BPF_TRAMP_REPLACE, /* more than MAX */
648 struct bpf_tramp_image {
650 struct bpf_ksym ksym;
651 struct percpu_ref pcref;
656 struct work_struct work;
660 struct bpf_trampoline {
661 /* hlist for trampoline_table */
662 struct hlist_node hlist;
663 /* serializes access to fields of this trampoline */
668 struct btf_func_model model;
672 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
673 * program by replacing one of its functions. func.addr is the address
674 * of the function it replaced.
676 struct bpf_prog *extension_prog;
677 /* list of BPF programs using this trampoline */
678 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
679 /* Number of attached programs. A counter per kind. */
680 int progs_cnt[BPF_TRAMP_MAX];
681 /* Executable image of trampoline */
682 struct bpf_tramp_image *cur_image;
687 struct bpf_attach_target_info {
688 struct btf_func_model fmodel;
690 const char *tgt_name;
691 const struct btf_type *tgt_type;
694 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
696 struct bpf_dispatcher_prog {
697 struct bpf_prog *prog;
701 struct bpf_dispatcher {
702 /* dispatcher mutex */
705 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
709 struct bpf_ksym ksym;
712 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
714 const struct bpf_insn *insnsi,
715 unsigned int (*bpf_func)(const void *,
716 const struct bpf_insn *))
718 return bpf_func(ctx, insnsi);
720 #ifdef CONFIG_BPF_JIT
721 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
722 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
723 struct bpf_trampoline *bpf_trampoline_get(u64 key,
724 struct bpf_attach_target_info *tgt_info);
725 void bpf_trampoline_put(struct bpf_trampoline *tr);
726 #define BPF_DISPATCHER_INIT(_name) { \
727 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
728 .func = &_name##_func, \
735 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
739 #define DEFINE_BPF_DISPATCHER(name) \
740 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
742 const struct bpf_insn *insnsi, \
743 unsigned int (*bpf_func)(const void *, \
744 const struct bpf_insn *)) \
746 return bpf_func(ctx, insnsi); \
748 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
749 struct bpf_dispatcher bpf_dispatcher_##name = \
750 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
751 #define DECLARE_BPF_DISPATCHER(name) \
752 unsigned int bpf_dispatcher_##name##_func( \
754 const struct bpf_insn *insnsi, \
755 unsigned int (*bpf_func)(const void *, \
756 const struct bpf_insn *)); \
757 extern struct bpf_dispatcher bpf_dispatcher_##name;
758 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
759 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
760 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
761 struct bpf_prog *to);
762 /* Called only from JIT-enabled code, so there's no need for stubs. */
763 void *bpf_jit_alloc_exec_page(void);
764 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
765 void bpf_image_ksym_del(struct bpf_ksym *ksym);
766 void bpf_ksym_add(struct bpf_ksym *ksym);
767 void bpf_ksym_del(struct bpf_ksym *ksym);
768 int bpf_jit_charge_modmem(u32 pages);
769 void bpf_jit_uncharge_modmem(u32 pages);
771 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
772 struct bpf_trampoline *tr)
776 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
777 struct bpf_trampoline *tr)
781 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
782 struct bpf_attach_target_info *tgt_info)
784 return ERR_PTR(-EOPNOTSUPP);
786 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
787 #define DEFINE_BPF_DISPATCHER(name)
788 #define DECLARE_BPF_DISPATCHER(name)
789 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
790 #define BPF_DISPATCHER_PTR(name) NULL
791 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
792 struct bpf_prog *from,
793 struct bpf_prog *to) {}
794 static inline bool is_bpf_image_address(unsigned long address)
800 struct bpf_func_info_aux {
805 enum bpf_jit_poke_reason {
806 BPF_POKE_REASON_TAIL_CALL,
809 /* Descriptor of pokes pointing /into/ the JITed image. */
810 struct bpf_jit_poke_descriptor {
811 void *tailcall_target;
812 void *tailcall_bypass;
821 bool tailcall_target_stable;
827 /* reg_type info for ctx arguments */
828 struct bpf_ctx_arg_aux {
830 enum bpf_reg_type reg_type;
834 struct btf_mod_pair {
836 struct module *module;
839 struct bpf_kfunc_desc_tab;
841 struct bpf_prog_aux {
850 u32 func_cnt; /* used by non-func prog as the number of func progs */
851 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
852 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
853 u32 ctx_arg_info_size;
854 u32 max_rdonly_access;
856 struct btf *attach_btf;
857 const struct bpf_ctx_arg_aux *ctx_arg_info;
858 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
859 struct bpf_prog *dst_prog;
860 struct bpf_trampoline *dst_trampoline;
861 enum bpf_prog_type saved_dst_prog_type;
862 enum bpf_attach_type saved_dst_attach_type;
863 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
864 bool offload_requested;
865 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
866 bool func_proto_unreliable;
868 bool tail_call_reachable;
869 struct hlist_node tramp_hlist;
870 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
871 const struct btf_type *attach_func_proto;
872 /* function name for valid attach_btf_id */
873 const char *attach_func_name;
874 struct bpf_prog **func;
875 void *jit_data; /* JIT specific data. arch dependent */
876 struct bpf_jit_poke_descriptor *poke_tab;
877 struct bpf_kfunc_desc_tab *kfunc_tab;
879 struct bpf_ksym ksym;
880 const struct bpf_prog_ops *ops;
881 struct bpf_map **used_maps;
882 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
883 struct btf_mod_pair *used_btfs;
884 struct bpf_prog *prog;
885 struct user_struct *user;
886 u64 load_time; /* ns since boottime */
887 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
888 char name[BPF_OBJ_NAME_LEN];
889 #ifdef CONFIG_SECURITY
892 struct bpf_prog_offload *offload;
894 struct bpf_func_info *func_info;
895 struct bpf_func_info_aux *func_info_aux;
896 /* bpf_line_info loaded from userspace. linfo->insn_off
897 * has the xlated insn offset.
898 * Both the main and sub prog share the same linfo.
899 * The subprog can access its first linfo by
900 * using the linfo_idx.
902 struct bpf_line_info *linfo;
903 /* jited_linfo is the jited addr of the linfo. It has a
904 * one to one mapping to linfo:
905 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
906 * Both the main and sub prog share the same jited_linfo.
907 * The subprog can access its first jited_linfo by
908 * using the linfo_idx.
913 /* subprog can use linfo_idx to access its first linfo and
915 * main prog always has linfo_idx == 0
919 struct exception_table_entry *extable;
921 struct work_struct work;
926 struct bpf_array_aux {
927 /* 'Ownership' of prog array is claimed by the first program that
928 * is going to use this map or by the first program which FD is
929 * stored in the map to make sure that all callers and callees have
930 * the same prog type and JITed flag.
934 enum bpf_prog_type type;
937 /* Programs with direct jumps into programs part of this array. */
938 struct list_head poke_progs;
940 struct mutex poke_mutex;
941 struct work_struct work;
947 enum bpf_link_type type;
948 const struct bpf_link_ops *ops;
949 struct bpf_prog *prog;
950 struct work_struct work;
953 struct bpf_link_ops {
954 void (*release)(struct bpf_link *link);
955 void (*dealloc)(struct bpf_link *link);
956 int (*detach)(struct bpf_link *link);
957 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
958 struct bpf_prog *old_prog);
959 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
960 int (*fill_link_info)(const struct bpf_link *link,
961 struct bpf_link_info *info);
964 struct bpf_link_primer {
965 struct bpf_link *link;
971 struct bpf_struct_ops_value;
974 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
975 struct bpf_struct_ops {
976 const struct bpf_verifier_ops *verifier_ops;
977 int (*init)(struct btf *btf);
978 int (*check_member)(const struct btf_type *t,
979 const struct btf_member *member);
980 int (*init_member)(const struct btf_type *t,
981 const struct btf_member *member,
982 void *kdata, const void *udata);
983 int (*reg)(void *kdata);
984 void (*unreg)(void *kdata);
985 const struct btf_type *type;
986 const struct btf_type *value_type;
988 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
993 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
994 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
995 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
996 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
997 bool bpf_struct_ops_get(const void *kdata);
998 void bpf_struct_ops_put(const void *kdata);
999 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1001 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1003 if (owner == BPF_MODULE_OWNER)
1004 return bpf_struct_ops_get(data);
1006 return try_module_get(owner);
1008 static inline void bpf_module_put(const void *data, struct module *owner)
1010 if (owner == BPF_MODULE_OWNER)
1011 bpf_struct_ops_put(data);
1016 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1020 static inline void bpf_struct_ops_init(struct btf *btf,
1021 struct bpf_verifier_log *log)
1024 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1026 return try_module_get(owner);
1028 static inline void bpf_module_put(const void *data, struct module *owner)
1032 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1044 struct bpf_array_aux *aux;
1046 char value[0] __aligned(8);
1047 void *ptrs[0] __aligned(8);
1048 void __percpu *pptrs[0] __aligned(8);
1052 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1053 #define MAX_TAIL_CALL_CNT 32
1055 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1056 BPF_F_RDONLY_PROG | \
1060 #define BPF_MAP_CAN_READ BIT(0)
1061 #define BPF_MAP_CAN_WRITE BIT(1)
1063 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1065 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1067 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1070 if (access_flags & BPF_F_RDONLY_PROG)
1071 return BPF_MAP_CAN_READ;
1072 else if (access_flags & BPF_F_WRONLY_PROG)
1073 return BPF_MAP_CAN_WRITE;
1075 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1078 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1080 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1081 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1084 struct bpf_event_entry {
1085 struct perf_event *event;
1086 struct file *perf_file;
1087 struct file *map_file;
1088 struct rcu_head rcu;
1091 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
1092 int bpf_prog_calc_tag(struct bpf_prog *fp);
1094 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1096 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1097 unsigned long off, unsigned long len);
1098 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1099 const struct bpf_insn *src,
1100 struct bpf_insn *dst,
1101 struct bpf_prog *prog,
1104 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1105 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1107 /* an array of programs to be executed under rcu_lock.
1110 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run);
1112 * the structure returned by bpf_prog_array_alloc() should be populated
1113 * with program pointers and the last pointer must be NULL.
1114 * The user has to keep refcnt on the program and make sure the program
1115 * is removed from the array before bpf_prog_put().
1116 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1117 * since other cpus are walking the array of pointers in parallel.
1119 struct bpf_prog_array_item {
1120 struct bpf_prog *prog;
1122 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1127 struct bpf_prog_array {
1128 struct rcu_head rcu;
1129 struct bpf_prog_array_item items[];
1132 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1133 void bpf_prog_array_free(struct bpf_prog_array *progs);
1134 int bpf_prog_array_length(struct bpf_prog_array *progs);
1135 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1136 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1137 __u32 __user *prog_ids, u32 cnt);
1139 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1140 struct bpf_prog *old_prog);
1141 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1142 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1143 struct bpf_prog *prog);
1144 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1145 u32 *prog_ids, u32 request_cnt,
1147 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1148 struct bpf_prog *exclude_prog,
1149 struct bpf_prog *include_prog,
1151 struct bpf_prog_array **new_array);
1153 struct bpf_run_ctx {};
1155 struct bpf_cg_run_ctx {
1156 struct bpf_run_ctx run_ctx;
1157 const struct bpf_prog_array_item *prog_item;
1160 struct bpf_trace_run_ctx {
1161 struct bpf_run_ctx run_ctx;
1165 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1167 struct bpf_run_ctx *old_ctx = NULL;
1169 #ifdef CONFIG_BPF_SYSCALL
1170 old_ctx = current->bpf_ctx;
1171 current->bpf_ctx = new_ctx;
1176 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1178 #ifdef CONFIG_BPF_SYSCALL
1179 current->bpf_ctx = old_ctx;
1183 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1184 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1185 /* BPF program asks to set CN on the packet. */
1186 #define BPF_RET_SET_CN (1 << 0)
1188 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1190 static __always_inline u32
1191 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu,
1192 const void *ctx, bpf_prog_run_fn run_prog,
1195 const struct bpf_prog_array_item *item;
1196 const struct bpf_prog *prog;
1197 const struct bpf_prog_array *array;
1198 struct bpf_run_ctx *old_run_ctx;
1199 struct bpf_cg_run_ctx run_ctx;
1205 array = rcu_dereference(array_rcu);
1206 item = &array->items[0];
1207 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1208 while ((prog = READ_ONCE(item->prog))) {
1209 run_ctx.prog_item = item;
1210 func_ret = run_prog(prog, ctx);
1211 ret &= (func_ret & 1);
1212 *(ret_flags) |= (func_ret >> 1);
1215 bpf_reset_run_ctx(old_run_ctx);
1221 static __always_inline u32
1222 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu,
1223 const void *ctx, bpf_prog_run_fn run_prog)
1225 const struct bpf_prog_array_item *item;
1226 const struct bpf_prog *prog;
1227 const struct bpf_prog_array *array;
1228 struct bpf_run_ctx *old_run_ctx;
1229 struct bpf_cg_run_ctx run_ctx;
1234 array = rcu_dereference(array_rcu);
1235 item = &array->items[0];
1236 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1237 while ((prog = READ_ONCE(item->prog))) {
1238 run_ctx.prog_item = item;
1239 ret &= run_prog(prog, ctx);
1242 bpf_reset_run_ctx(old_run_ctx);
1248 static __always_inline u32
1249 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu,
1250 const void *ctx, bpf_prog_run_fn run_prog)
1252 const struct bpf_prog_array_item *item;
1253 const struct bpf_prog *prog;
1254 const struct bpf_prog_array *array;
1255 struct bpf_run_ctx *old_run_ctx;
1256 struct bpf_trace_run_ctx run_ctx;
1261 array = rcu_dereference(array_rcu);
1262 if (unlikely(!array))
1264 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1265 item = &array->items[0];
1266 while ((prog = READ_ONCE(item->prog))) {
1267 run_ctx.bpf_cookie = item->bpf_cookie;
1268 ret &= run_prog(prog, ctx);
1271 bpf_reset_run_ctx(old_run_ctx);
1278 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1279 * so BPF programs can request cwr for TCP packets.
1281 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1282 * packet. This macro changes the behavior so the low order bit
1283 * indicates whether the packet should be dropped (0) or not (1)
1284 * and the next bit is a congestion notification bit. This could be
1285 * used by TCP to call tcp_enter_cwr()
1287 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1290 * 2: drop packet and cn
1291 * 3: keep packet and cn
1293 * This macro then converts it to one of the NET_XMIT or an error
1294 * code that is then interpreted as drop packet (and no cn):
1295 * 0: NET_XMIT_SUCCESS skb should be transmitted
1296 * 1: NET_XMIT_DROP skb should be dropped and cn
1297 * 2: NET_XMIT_CN skb should be transmitted and cn
1298 * 3: -EPERM skb should be dropped
1300 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1305 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, &_flags); \
1306 _cn = _flags & BPF_RET_SET_CN; \
1308 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1310 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1314 #ifdef CONFIG_BPF_SYSCALL
1315 DECLARE_PER_CPU(int, bpf_prog_active);
1316 extern struct mutex bpf_stats_enabled_mutex;
1319 * Block execution of BPF programs attached to instrumentation (perf,
1320 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1321 * these events can happen inside a region which holds a map bucket lock
1322 * and can deadlock on it.
1324 * Use the preemption safe inc/dec variants on RT because migrate disable
1325 * is preemptible on RT and preemption in the middle of the RMW operation
1326 * might lead to inconsistent state. Use the raw variants for non RT
1327 * kernels as migrate_disable() maps to preempt_disable() so the slightly
1328 * more expensive save operation can be avoided.
1330 static inline void bpf_disable_instrumentation(void)
1333 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1334 this_cpu_inc(bpf_prog_active);
1336 __this_cpu_inc(bpf_prog_active);
1339 static inline void bpf_enable_instrumentation(void)
1341 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1342 this_cpu_dec(bpf_prog_active);
1344 __this_cpu_dec(bpf_prog_active);
1348 extern const struct file_operations bpf_map_fops;
1349 extern const struct file_operations bpf_prog_fops;
1350 extern const struct file_operations bpf_iter_fops;
1352 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1353 extern const struct bpf_prog_ops _name ## _prog_ops; \
1354 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1355 #define BPF_MAP_TYPE(_id, _ops) \
1356 extern const struct bpf_map_ops _ops;
1357 #define BPF_LINK_TYPE(_id, _name)
1358 #include <linux/bpf_types.h>
1359 #undef BPF_PROG_TYPE
1361 #undef BPF_LINK_TYPE
1363 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1364 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1365 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1367 struct bpf_prog *bpf_prog_get(u32 ufd);
1368 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1370 void bpf_prog_add(struct bpf_prog *prog, int i);
1371 void bpf_prog_sub(struct bpf_prog *prog, int i);
1372 void bpf_prog_inc(struct bpf_prog *prog);
1373 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1374 void bpf_prog_put(struct bpf_prog *prog);
1376 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1377 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1379 struct bpf_map *bpf_map_get(u32 ufd);
1380 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1381 struct bpf_map *__bpf_map_get(struct fd f);
1382 void bpf_map_inc(struct bpf_map *map);
1383 void bpf_map_inc_with_uref(struct bpf_map *map);
1384 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1385 void bpf_map_put_with_uref(struct bpf_map *map);
1386 void bpf_map_put(struct bpf_map *map);
1387 void *bpf_map_area_alloc(u64 size, int numa_node);
1388 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1389 void bpf_map_area_free(void *base);
1390 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1391 int generic_map_lookup_batch(struct bpf_map *map,
1392 const union bpf_attr *attr,
1393 union bpf_attr __user *uattr);
1394 int generic_map_update_batch(struct bpf_map *map,
1395 const union bpf_attr *attr,
1396 union bpf_attr __user *uattr);
1397 int generic_map_delete_batch(struct bpf_map *map,
1398 const union bpf_attr *attr,
1399 union bpf_attr __user *uattr);
1400 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1401 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1403 #ifdef CONFIG_MEMCG_KMEM
1404 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1406 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1407 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1408 size_t align, gfp_t flags);
1410 static inline void *
1411 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1414 return kmalloc_node(size, flags, node);
1417 static inline void *
1418 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1420 return kzalloc(size, flags);
1423 static inline void __percpu *
1424 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
1427 return __alloc_percpu_gfp(size, align, flags);
1431 extern int sysctl_unprivileged_bpf_disabled;
1433 static inline bool bpf_allow_ptr_leaks(void)
1435 return perfmon_capable();
1438 static inline bool bpf_allow_uninit_stack(void)
1440 return perfmon_capable();
1443 static inline bool bpf_allow_ptr_to_map_access(void)
1445 return perfmon_capable();
1448 static inline bool bpf_bypass_spec_v1(void)
1450 return perfmon_capable();
1453 static inline bool bpf_bypass_spec_v4(void)
1455 return perfmon_capable();
1458 int bpf_map_new_fd(struct bpf_map *map, int flags);
1459 int bpf_prog_new_fd(struct bpf_prog *prog);
1461 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1462 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1463 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1464 int bpf_link_settle(struct bpf_link_primer *primer);
1465 void bpf_link_cleanup(struct bpf_link_primer *primer);
1466 void bpf_link_inc(struct bpf_link *link);
1467 void bpf_link_put(struct bpf_link *link);
1468 int bpf_link_new_fd(struct bpf_link *link);
1469 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1470 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1472 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1473 int bpf_obj_get_user(const char __user *pathname, int flags);
1475 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1476 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1477 extern int bpf_iter_ ## target(args); \
1478 int __init bpf_iter_ ## target(args) { return 0; }
1480 struct bpf_iter_aux_info {
1481 struct bpf_map *map;
1484 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1485 union bpf_iter_link_info *linfo,
1486 struct bpf_iter_aux_info *aux);
1487 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1488 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1489 struct seq_file *seq);
1490 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1491 struct bpf_link_info *info);
1492 typedef const struct bpf_func_proto *
1493 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
1494 const struct bpf_prog *prog);
1496 enum bpf_iter_feature {
1497 BPF_ITER_RESCHED = BIT(0),
1500 #define BPF_ITER_CTX_ARG_MAX 2
1501 struct bpf_iter_reg {
1503 bpf_iter_attach_target_t attach_target;
1504 bpf_iter_detach_target_t detach_target;
1505 bpf_iter_show_fdinfo_t show_fdinfo;
1506 bpf_iter_fill_link_info_t fill_link_info;
1507 bpf_iter_get_func_proto_t get_func_proto;
1508 u32 ctx_arg_info_size;
1510 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1511 const struct bpf_iter_seq_info *seq_info;
1514 struct bpf_iter_meta {
1515 __bpf_md_ptr(struct seq_file *, seq);
1520 struct bpf_iter__bpf_map_elem {
1521 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1522 __bpf_md_ptr(struct bpf_map *, map);
1523 __bpf_md_ptr(void *, key);
1524 __bpf_md_ptr(void *, value);
1527 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1528 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1529 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1530 const struct bpf_func_proto *
1531 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
1532 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
1533 int bpf_iter_new_fd(struct bpf_link *link);
1534 bool bpf_link_is_iter(struct bpf_link *link);
1535 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1536 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1537 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1538 struct seq_file *seq);
1539 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1540 struct bpf_link_info *info);
1542 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
1543 struct bpf_func_state *caller,
1544 struct bpf_func_state *callee);
1546 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1547 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1548 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1550 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1553 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1555 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1556 void *key, void *value, u64 map_flags);
1557 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1558 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1559 void *key, void *value, u64 map_flags);
1560 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1562 int bpf_get_file_flag(int flags);
1563 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
1564 size_t actual_size);
1566 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1567 * forced to use 'long' read/writes to try to atomically copy long counters.
1568 * Best-effort only. No barriers here, since it _will_ race with concurrent
1569 * updates from BPF programs. Called from bpf syscall and mostly used with
1570 * size 8 or 16 bytes, so ask compiler to inline it.
1572 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1574 const long *lsrc = src;
1577 size /= sizeof(long);
1582 /* verify correctness of eBPF program */
1583 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
1585 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1586 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1589 struct btf *bpf_get_btf_vmlinux(void);
1594 struct bpf_dtab_netdev;
1595 struct bpf_cpu_map_entry;
1597 void __dev_flush(void);
1598 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1599 struct net_device *dev_rx);
1600 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1601 struct net_device *dev_rx);
1602 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1603 struct bpf_map *map, bool exclude_ingress);
1604 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1605 struct bpf_prog *xdp_prog);
1606 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1607 struct bpf_prog *xdp_prog, struct bpf_map *map,
1608 bool exclude_ingress);
1610 void __cpu_map_flush(void);
1611 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1612 struct net_device *dev_rx);
1613 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1614 struct sk_buff *skb);
1616 /* Return map's numa specified by userspace */
1617 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1619 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1620 attr->numa_node : NUMA_NO_NODE;
1623 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1624 int array_map_alloc_check(union bpf_attr *attr);
1626 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1627 union bpf_attr __user *uattr);
1628 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1629 union bpf_attr __user *uattr);
1630 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1631 const union bpf_attr *kattr,
1632 union bpf_attr __user *uattr);
1633 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1634 const union bpf_attr *kattr,
1635 union bpf_attr __user *uattr);
1636 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1637 const union bpf_attr *kattr,
1638 union bpf_attr __user *uattr);
1639 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1640 const union bpf_attr *kattr,
1641 union bpf_attr __user *uattr);
1642 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id);
1643 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1644 const struct bpf_prog *prog,
1645 struct bpf_insn_access_aux *info);
1646 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf,
1647 const struct btf_type *t, int off, int size,
1648 enum bpf_access_type atype,
1650 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1651 const struct btf *btf, u32 id, int off,
1652 const struct btf *need_btf, u32 need_type_id);
1654 int btf_distill_func_proto(struct bpf_verifier_log *log,
1656 const struct btf_type *func_proto,
1657 const char *func_name,
1658 struct btf_func_model *m);
1660 struct bpf_reg_state;
1661 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
1662 struct bpf_reg_state *regs);
1663 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
1664 const struct btf *btf, u32 func_id,
1665 struct bpf_reg_state *regs);
1666 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1667 struct bpf_reg_state *reg);
1668 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1669 struct btf *btf, const struct btf_type *t);
1671 struct bpf_prog *bpf_prog_by_id(u32 id);
1672 struct bpf_link *bpf_link_by_id(u32 id);
1674 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1675 void bpf_task_storage_free(struct task_struct *task);
1676 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
1677 const struct btf_func_model *
1678 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1679 const struct bpf_insn *insn);
1680 #else /* !CONFIG_BPF_SYSCALL */
1681 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1683 return ERR_PTR(-EOPNOTSUPP);
1686 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1687 enum bpf_prog_type type,
1690 return ERR_PTR(-EOPNOTSUPP);
1693 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1697 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1701 static inline void bpf_prog_put(struct bpf_prog *prog)
1705 static inline void bpf_prog_inc(struct bpf_prog *prog)
1709 static inline struct bpf_prog *__must_check
1710 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1712 return ERR_PTR(-EOPNOTSUPP);
1715 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1716 const struct bpf_link_ops *ops,
1717 struct bpf_prog *prog)
1721 static inline int bpf_link_prime(struct bpf_link *link,
1722 struct bpf_link_primer *primer)
1727 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1732 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1736 static inline void bpf_link_inc(struct bpf_link *link)
1740 static inline void bpf_link_put(struct bpf_link *link)
1744 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1749 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1754 static inline void __dev_flush(void)
1759 struct bpf_dtab_netdev;
1760 struct bpf_cpu_map_entry;
1763 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1764 struct net_device *dev_rx)
1770 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1771 struct net_device *dev_rx)
1777 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1778 struct bpf_map *map, bool exclude_ingress)
1785 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1786 struct sk_buff *skb,
1787 struct bpf_prog *xdp_prog)
1793 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1794 struct bpf_prog *xdp_prog, struct bpf_map *map,
1795 bool exclude_ingress)
1800 static inline void __cpu_map_flush(void)
1804 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1805 struct xdp_buff *xdp,
1806 struct net_device *dev_rx)
1811 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1812 struct sk_buff *skb)
1817 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1822 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1823 enum bpf_prog_type type)
1825 return ERR_PTR(-EOPNOTSUPP);
1828 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1829 const union bpf_attr *kattr,
1830 union bpf_attr __user *uattr)
1835 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1836 const union bpf_attr *kattr,
1837 union bpf_attr __user *uattr)
1842 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1843 const union bpf_attr *kattr,
1844 union bpf_attr __user *uattr)
1849 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1850 const union bpf_attr *kattr,
1851 union bpf_attr __user *uattr)
1856 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1857 const union bpf_attr *kattr,
1858 union bpf_attr __user *uattr)
1863 static inline bool bpf_prog_test_check_kfunc_call(u32 kfunc_id)
1868 static inline void bpf_map_put(struct bpf_map *map)
1872 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1874 return ERR_PTR(-ENOTSUPP);
1877 static inline const struct bpf_func_proto *
1878 bpf_base_func_proto(enum bpf_func_id func_id)
1883 static inline void bpf_task_storage_free(struct task_struct *task)
1887 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
1892 static inline const struct btf_func_model *
1893 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1894 const struct bpf_insn *insn)
1898 #endif /* CONFIG_BPF_SYSCALL */
1900 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
1901 struct btf_mod_pair *used_btfs, u32 len);
1903 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1904 enum bpf_prog_type type)
1906 return bpf_prog_get_type_dev(ufd, type, false);
1909 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1910 struct bpf_map **used_maps, u32 len);
1912 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1914 int bpf_prog_offload_compile(struct bpf_prog *prog);
1915 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1916 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1917 struct bpf_prog *prog);
1919 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1921 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1922 int bpf_map_offload_update_elem(struct bpf_map *map,
1923 void *key, void *value, u64 flags);
1924 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1925 int bpf_map_offload_get_next_key(struct bpf_map *map,
1926 void *key, void *next_key);
1928 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1930 struct bpf_offload_dev *
1931 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1932 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1933 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1934 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1935 struct net_device *netdev);
1936 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1937 struct net_device *netdev);
1938 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
1940 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
1941 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
1943 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
1945 return aux->offload_requested;
1948 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1950 return unlikely(map->ops == &bpf_map_offload_ops);
1953 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
1954 void bpf_map_offload_map_free(struct bpf_map *map);
1955 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
1956 const union bpf_attr *kattr,
1957 union bpf_attr __user *uattr);
1959 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
1960 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
1961 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
1962 void sock_map_unhash(struct sock *sk);
1963 void sock_map_close(struct sock *sk, long timeout);
1965 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
1966 union bpf_attr *attr)
1971 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
1976 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1981 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
1983 return ERR_PTR(-EOPNOTSUPP);
1986 static inline void bpf_map_offload_map_free(struct bpf_map *map)
1990 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
1991 const union bpf_attr *kattr,
1992 union bpf_attr __user *uattr)
1997 #ifdef CONFIG_BPF_SYSCALL
1998 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
1999 struct bpf_prog *prog)
2004 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2005 enum bpf_prog_type ptype)
2010 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2015 #endif /* CONFIG_BPF_SYSCALL */
2016 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2018 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2019 void bpf_sk_reuseport_detach(struct sock *sk);
2020 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2022 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2023 void *value, u64 map_flags);
2025 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2029 #ifdef CONFIG_BPF_SYSCALL
2030 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2031 void *key, void *value)
2036 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2037 void *key, void *value,
2042 #endif /* CONFIG_BPF_SYSCALL */
2043 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2045 /* verifier prototypes for helper functions called from eBPF programs */
2046 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2047 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2048 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2049 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2050 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2051 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2053 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2054 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2055 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2056 extern const struct bpf_func_proto bpf_tail_call_proto;
2057 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2058 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2059 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2060 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2061 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2062 extern const struct bpf_func_proto bpf_get_stackid_proto;
2063 extern const struct bpf_func_proto bpf_get_stack_proto;
2064 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2065 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2066 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2067 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2068 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2069 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2070 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2071 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2072 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2073 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2074 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2075 extern const struct bpf_func_proto bpf_spin_lock_proto;
2076 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2077 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2078 extern const struct bpf_func_proto bpf_strtol_proto;
2079 extern const struct bpf_func_proto bpf_strtoul_proto;
2080 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2081 extern const struct bpf_func_proto bpf_jiffies64_proto;
2082 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2083 extern const struct bpf_func_proto bpf_event_output_data_proto;
2084 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2085 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2086 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2087 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2088 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2089 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2090 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2091 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2092 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2093 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2094 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2095 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2096 extern const struct bpf_func_proto bpf_snprintf_proto;
2097 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2098 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2099 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2100 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2101 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2102 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2103 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2104 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2105 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2106 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2107 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2109 const struct bpf_func_proto *tracing_prog_func_proto(
2110 enum bpf_func_id func_id, const struct bpf_prog *prog);
2112 /* Shared helpers among cBPF and eBPF. */
2113 void bpf_user_rnd_init_once(void);
2114 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2115 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2117 #if defined(CONFIG_NET)
2118 bool bpf_sock_common_is_valid_access(int off, int size,
2119 enum bpf_access_type type,
2120 struct bpf_insn_access_aux *info);
2121 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2122 struct bpf_insn_access_aux *info);
2123 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2124 const struct bpf_insn *si,
2125 struct bpf_insn *insn_buf,
2126 struct bpf_prog *prog,
2129 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2130 enum bpf_access_type type,
2131 struct bpf_insn_access_aux *info)
2135 static inline bool bpf_sock_is_valid_access(int off, int size,
2136 enum bpf_access_type type,
2137 struct bpf_insn_access_aux *info)
2141 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2142 const struct bpf_insn *si,
2143 struct bpf_insn *insn_buf,
2144 struct bpf_prog *prog,
2152 struct sk_reuseport_kern {
2153 struct sk_buff *skb;
2155 struct sock *selected_sk;
2156 struct sock *migrating_sk;
2162 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2163 struct bpf_insn_access_aux *info);
2165 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2166 const struct bpf_insn *si,
2167 struct bpf_insn *insn_buf,
2168 struct bpf_prog *prog,
2171 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2172 struct bpf_insn_access_aux *info);
2174 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2175 const struct bpf_insn *si,
2176 struct bpf_insn *insn_buf,
2177 struct bpf_prog *prog,
2180 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2181 enum bpf_access_type type,
2182 struct bpf_insn_access_aux *info)
2187 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2188 const struct bpf_insn *si,
2189 struct bpf_insn *insn_buf,
2190 struct bpf_prog *prog,
2195 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2196 enum bpf_access_type type,
2197 struct bpf_insn_access_aux *info)
2202 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2203 const struct bpf_insn *si,
2204 struct bpf_insn *insn_buf,
2205 struct bpf_prog *prog,
2210 #endif /* CONFIG_INET */
2212 enum bpf_text_poke_type {
2217 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2218 void *addr1, void *addr2);
2221 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2223 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2224 u32 **bin_buf, u32 num_args);
2225 void bpf_bprintf_cleanup(void);
2227 #endif /* _LINUX_BPF_H */