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;
196 u64 writecnt; /* writable mmap cnt; protected by 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 /* function argument constraints */
302 ARG_DONTCARE = 0, /* unused argument in helper function */
304 /* the following constraints used to prototype
305 * bpf_map_lookup/update/delete_elem() functions
307 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
308 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
309 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
310 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
311 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */
313 /* the following constraints used to prototype bpf_memcmp() and other
314 * functions that access data on eBPF program stack
316 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
317 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
318 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
319 * helper function must fill all bytes or clear
320 * them in error case.
323 ARG_CONST_SIZE, /* number of bytes accessed from memory */
324 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
326 ARG_PTR_TO_CTX, /* pointer to context */
327 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
328 ARG_ANYTHING, /* any (initialized) argument is ok */
329 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
330 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
331 ARG_PTR_TO_INT, /* pointer to int */
332 ARG_PTR_TO_LONG, /* pointer to long */
333 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
334 ARG_PTR_TO_SOCKET_OR_NULL, /* pointer to bpf_sock (fullsock) or NULL */
335 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
336 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
337 ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */
338 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
339 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
340 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
341 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
342 ARG_PTR_TO_STACK_OR_NULL, /* pointer to stack or NULL */
343 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
344 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
348 /* type of values returned from helper functions */
349 enum bpf_return_type {
350 RET_INTEGER, /* function returns integer */
351 RET_VOID, /* function doesn't return anything */
352 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
353 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
354 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */
355 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */
356 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
357 RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */
358 RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */
359 RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, /* returns a pointer to a valid memory or a btf_id or NULL */
360 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
361 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
364 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
365 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
366 * instructions after verifying
368 struct bpf_func_proto {
369 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
372 enum bpf_return_type ret_type;
375 enum bpf_arg_type arg1_type;
376 enum bpf_arg_type arg2_type;
377 enum bpf_arg_type arg3_type;
378 enum bpf_arg_type arg4_type;
379 enum bpf_arg_type arg5_type;
381 enum bpf_arg_type arg_type[5];
393 int *ret_btf_id; /* return value btf_id */
394 bool (*allowed)(const struct bpf_prog *prog);
397 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
398 * the first argument to eBPF programs.
399 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
403 enum bpf_access_type {
408 /* types of values stored in eBPF registers */
409 /* Pointer types represent:
412 * pointer + (u16) var
413 * pointer + (u16) var + imm
414 * if (range > 0) then [ptr, ptr + range - off) is safe to access
415 * if (id > 0) means that some 'var' was added
416 * if (off > 0) means that 'imm' was added
419 NOT_INIT = 0, /* nothing was written into register */
420 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
421 PTR_TO_CTX, /* reg points to bpf_context */
422 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
423 PTR_TO_MAP_VALUE, /* reg points to map element value */
424 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
425 PTR_TO_STACK, /* reg == frame_pointer + offset */
426 PTR_TO_PACKET_META, /* skb->data - meta_len */
427 PTR_TO_PACKET, /* reg points to skb->data */
428 PTR_TO_PACKET_END, /* skb->data + headlen */
429 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
430 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
431 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */
432 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
433 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
434 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
435 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
436 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
437 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
438 /* PTR_TO_BTF_ID points to a kernel struct that does not need
439 * to be null checked by the BPF program. This does not imply the
440 * pointer is _not_ null and in practice this can easily be a null
441 * pointer when reading pointer chains. The assumption is program
442 * context will handle null pointer dereference typically via fault
443 * handling. The verifier must keep this in mind and can make no
444 * assumptions about null or non-null when doing branch analysis.
445 * Further, when passed into helpers the helpers can not, without
446 * additional context, assume the value is non-null.
449 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
450 * been checked for null. Used primarily to inform the verifier
451 * an explicit null check is required for this struct.
453 PTR_TO_BTF_ID_OR_NULL,
454 PTR_TO_MEM, /* reg points to valid memory region */
455 PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */
456 PTR_TO_RDONLY_BUF, /* reg points to a readonly buffer */
457 PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */
458 PTR_TO_RDWR_BUF, /* reg points to a read/write buffer */
459 PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */
460 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */
461 PTR_TO_FUNC, /* reg points to a bpf program function */
462 PTR_TO_MAP_KEY, /* reg points to a map element key */
466 /* The information passed from prog-specific *_is_valid_access
467 * back to the verifier.
469 struct bpf_insn_access_aux {
470 enum bpf_reg_type reg_type;
478 struct bpf_verifier_log *log; /* for verbose logs */
482 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
484 aux->ctx_field_size = size;
487 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
489 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
490 insn->src_reg == BPF_PSEUDO_FUNC;
493 struct bpf_prog_ops {
494 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
495 union bpf_attr __user *uattr);
498 struct bpf_verifier_ops {
499 /* return eBPF function prototype for verification */
500 const struct bpf_func_proto *
501 (*get_func_proto)(enum bpf_func_id func_id,
502 const struct bpf_prog *prog);
504 /* return true if 'size' wide access at offset 'off' within bpf_context
505 * with 'type' (read or write) is allowed
507 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
508 const struct bpf_prog *prog,
509 struct bpf_insn_access_aux *info);
510 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
511 const struct bpf_prog *prog);
512 int (*gen_ld_abs)(const struct bpf_insn *orig,
513 struct bpf_insn *insn_buf);
514 u32 (*convert_ctx_access)(enum bpf_access_type type,
515 const struct bpf_insn *src,
516 struct bpf_insn *dst,
517 struct bpf_prog *prog, u32 *target_size);
518 int (*btf_struct_access)(struct bpf_verifier_log *log,
519 const struct btf *btf,
520 const struct btf_type *t, int off, int size,
521 enum bpf_access_type atype,
523 bool (*check_kfunc_call)(u32 kfunc_btf_id, struct module *owner);
526 struct bpf_prog_offload_ops {
527 /* verifier basic callbacks */
528 int (*insn_hook)(struct bpf_verifier_env *env,
529 int insn_idx, int prev_insn_idx);
530 int (*finalize)(struct bpf_verifier_env *env);
531 /* verifier optimization callbacks (called after .finalize) */
532 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
533 struct bpf_insn *insn);
534 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
535 /* program management callbacks */
536 int (*prepare)(struct bpf_prog *prog);
537 int (*translate)(struct bpf_prog *prog);
538 void (*destroy)(struct bpf_prog *prog);
541 struct bpf_prog_offload {
542 struct bpf_prog *prog;
543 struct net_device *netdev;
544 struct bpf_offload_dev *offdev;
546 struct list_head offloads;
553 enum bpf_cgroup_storage_type {
554 BPF_CGROUP_STORAGE_SHARED,
555 BPF_CGROUP_STORAGE_PERCPU,
556 __BPF_CGROUP_STORAGE_MAX
559 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
561 /* The longest tracepoint has 12 args.
562 * See include/trace/bpf_probe.h
564 #define MAX_BPF_FUNC_ARGS 12
566 /* The maximum number of arguments passed through registers
567 * a single function may have.
569 #define MAX_BPF_FUNC_REG_ARGS 5
571 struct btf_func_model {
574 u8 arg_size[MAX_BPF_FUNC_ARGS];
577 /* Restore arguments before returning from trampoline to let original function
578 * continue executing. This flag is used for fentry progs when there are no
581 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
582 /* Call original function after fentry progs, but before fexit progs.
583 * Makes sense for fentry/fexit, normal calls and indirect calls.
585 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
586 /* Skip current frame and return to parent. Makes sense for fentry/fexit
587 * programs only. Should not be used with normal calls and indirect calls.
589 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
590 /* Store IP address of the caller on the trampoline stack,
591 * so it's available for trampoline's programs.
593 #define BPF_TRAMP_F_IP_ARG BIT(3)
594 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
595 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
597 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
598 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
600 #define BPF_MAX_TRAMP_PROGS 38
602 struct bpf_tramp_progs {
603 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
607 /* Different use cases for BPF trampoline:
608 * 1. replace nop at the function entry (kprobe equivalent)
609 * flags = BPF_TRAMP_F_RESTORE_REGS
610 * fentry = a set of programs to run before returning from trampoline
612 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
613 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
614 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
615 * fentry = a set of program to run before calling original function
616 * fexit = a set of program to run after original function
618 * 3. replace direct call instruction anywhere in the function body
619 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
621 * fentry = a set of programs to run before returning from trampoline
622 * With flags = BPF_TRAMP_F_CALL_ORIG
623 * orig_call = original callback addr or direct function addr
624 * fentry = a set of program to run before calling original function
625 * fexit = a set of program to run after original function
627 struct bpf_tramp_image;
628 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
629 const struct btf_func_model *m, u32 flags,
630 struct bpf_tramp_progs *tprogs,
632 /* these two functions are called from generated trampoline */
633 u64 notrace __bpf_prog_enter(struct bpf_prog *prog);
634 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
635 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog);
636 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start);
637 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
638 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
643 char name[KSYM_NAME_LEN];
644 struct list_head lnode;
645 struct latch_tree_node tnode;
649 enum bpf_tramp_prog_type {
652 BPF_TRAMP_MODIFY_RETURN,
654 BPF_TRAMP_REPLACE, /* more than MAX */
657 struct bpf_tramp_image {
659 struct bpf_ksym ksym;
660 struct percpu_ref pcref;
665 struct work_struct work;
669 struct bpf_trampoline {
670 /* hlist for trampoline_table */
671 struct hlist_node hlist;
672 /* serializes access to fields of this trampoline */
677 struct btf_func_model model;
681 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
682 * program by replacing one of its functions. func.addr is the address
683 * of the function it replaced.
685 struct bpf_prog *extension_prog;
686 /* list of BPF programs using this trampoline */
687 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
688 /* Number of attached programs. A counter per kind. */
689 int progs_cnt[BPF_TRAMP_MAX];
690 /* Executable image of trampoline */
691 struct bpf_tramp_image *cur_image;
696 struct bpf_attach_target_info {
697 struct btf_func_model fmodel;
699 const char *tgt_name;
700 const struct btf_type *tgt_type;
703 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
705 struct bpf_dispatcher_prog {
706 struct bpf_prog *prog;
710 struct bpf_dispatcher {
711 /* dispatcher mutex */
714 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
718 struct bpf_ksym ksym;
721 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
723 const struct bpf_insn *insnsi,
724 unsigned int (*bpf_func)(const void *,
725 const struct bpf_insn *))
727 return bpf_func(ctx, insnsi);
729 #ifdef CONFIG_BPF_JIT
730 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
731 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
732 struct bpf_trampoline *bpf_trampoline_get(u64 key,
733 struct bpf_attach_target_info *tgt_info);
734 void bpf_trampoline_put(struct bpf_trampoline *tr);
735 #define BPF_DISPATCHER_INIT(_name) { \
736 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
737 .func = &_name##_func, \
744 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
748 #define DEFINE_BPF_DISPATCHER(name) \
749 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
751 const struct bpf_insn *insnsi, \
752 unsigned int (*bpf_func)(const void *, \
753 const struct bpf_insn *)) \
755 return bpf_func(ctx, insnsi); \
757 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
758 struct bpf_dispatcher bpf_dispatcher_##name = \
759 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
760 #define DECLARE_BPF_DISPATCHER(name) \
761 unsigned int bpf_dispatcher_##name##_func( \
763 const struct bpf_insn *insnsi, \
764 unsigned int (*bpf_func)(const void *, \
765 const struct bpf_insn *)); \
766 extern struct bpf_dispatcher bpf_dispatcher_##name;
767 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
768 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
769 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
770 struct bpf_prog *to);
771 /* Called only from JIT-enabled code, so there's no need for stubs. */
772 void *bpf_jit_alloc_exec_page(void);
773 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
774 void bpf_image_ksym_del(struct bpf_ksym *ksym);
775 void bpf_ksym_add(struct bpf_ksym *ksym);
776 void bpf_ksym_del(struct bpf_ksym *ksym);
777 int bpf_jit_charge_modmem(u32 pages);
778 void bpf_jit_uncharge_modmem(u32 pages);
780 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
781 struct bpf_trampoline *tr)
785 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
786 struct bpf_trampoline *tr)
790 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
791 struct bpf_attach_target_info *tgt_info)
793 return ERR_PTR(-EOPNOTSUPP);
795 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
796 #define DEFINE_BPF_DISPATCHER(name)
797 #define DECLARE_BPF_DISPATCHER(name)
798 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
799 #define BPF_DISPATCHER_PTR(name) NULL
800 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
801 struct bpf_prog *from,
802 struct bpf_prog *to) {}
803 static inline bool is_bpf_image_address(unsigned long address)
809 struct bpf_func_info_aux {
814 enum bpf_jit_poke_reason {
815 BPF_POKE_REASON_TAIL_CALL,
818 /* Descriptor of pokes pointing /into/ the JITed image. */
819 struct bpf_jit_poke_descriptor {
820 void *tailcall_target;
821 void *tailcall_bypass;
830 bool tailcall_target_stable;
836 /* reg_type info for ctx arguments */
837 struct bpf_ctx_arg_aux {
839 enum bpf_reg_type reg_type;
843 struct btf_mod_pair {
845 struct module *module;
848 struct bpf_kfunc_desc_tab;
850 struct bpf_prog_aux {
859 u32 func_cnt; /* used by non-func prog as the number of func progs */
860 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
861 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
862 u32 ctx_arg_info_size;
863 u32 max_rdonly_access;
865 struct btf *attach_btf;
866 const struct bpf_ctx_arg_aux *ctx_arg_info;
867 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
868 struct bpf_prog *dst_prog;
869 struct bpf_trampoline *dst_trampoline;
870 enum bpf_prog_type saved_dst_prog_type;
871 enum bpf_attach_type saved_dst_attach_type;
872 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
873 bool offload_requested;
874 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
875 bool func_proto_unreliable;
877 bool tail_call_reachable;
878 struct hlist_node tramp_hlist;
879 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
880 const struct btf_type *attach_func_proto;
881 /* function name for valid attach_btf_id */
882 const char *attach_func_name;
883 struct bpf_prog **func;
884 void *jit_data; /* JIT specific data. arch dependent */
885 struct bpf_jit_poke_descriptor *poke_tab;
886 struct bpf_kfunc_desc_tab *kfunc_tab;
887 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
889 struct bpf_ksym ksym;
890 const struct bpf_prog_ops *ops;
891 struct bpf_map **used_maps;
892 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
893 struct btf_mod_pair *used_btfs;
894 struct bpf_prog *prog;
895 struct user_struct *user;
896 u64 load_time; /* ns since boottime */
898 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
899 char name[BPF_OBJ_NAME_LEN];
900 #ifdef CONFIG_SECURITY
903 struct bpf_prog_offload *offload;
905 struct bpf_func_info *func_info;
906 struct bpf_func_info_aux *func_info_aux;
907 /* bpf_line_info loaded from userspace. linfo->insn_off
908 * has the xlated insn offset.
909 * Both the main and sub prog share the same linfo.
910 * The subprog can access its first linfo by
911 * using the linfo_idx.
913 struct bpf_line_info *linfo;
914 /* jited_linfo is the jited addr of the linfo. It has a
915 * one to one mapping to linfo:
916 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
917 * Both the main and sub prog share the same jited_linfo.
918 * The subprog can access its first jited_linfo by
919 * using the linfo_idx.
924 /* subprog can use linfo_idx to access its first linfo and
926 * main prog always has linfo_idx == 0
930 struct exception_table_entry *extable;
932 struct work_struct work;
937 struct bpf_array_aux {
938 /* 'Ownership' of prog array is claimed by the first program that
939 * is going to use this map or by the first program which FD is
940 * stored in the map to make sure that all callers and callees have
941 * the same prog type and JITed flag.
945 enum bpf_prog_type type;
948 /* Programs with direct jumps into programs part of this array. */
949 struct list_head poke_progs;
951 struct mutex poke_mutex;
952 struct work_struct work;
958 enum bpf_link_type type;
959 const struct bpf_link_ops *ops;
960 struct bpf_prog *prog;
961 struct work_struct work;
964 struct bpf_link_ops {
965 void (*release)(struct bpf_link *link);
966 void (*dealloc)(struct bpf_link *link);
967 int (*detach)(struct bpf_link *link);
968 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
969 struct bpf_prog *old_prog);
970 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
971 int (*fill_link_info)(const struct bpf_link *link,
972 struct bpf_link_info *info);
975 struct bpf_link_primer {
976 struct bpf_link *link;
982 struct bpf_struct_ops_value;
985 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
986 struct bpf_struct_ops {
987 const struct bpf_verifier_ops *verifier_ops;
988 int (*init)(struct btf *btf);
989 int (*check_member)(const struct btf_type *t,
990 const struct btf_member *member);
991 int (*init_member)(const struct btf_type *t,
992 const struct btf_member *member,
993 void *kdata, const void *udata);
994 int (*reg)(void *kdata);
995 void (*unreg)(void *kdata);
996 const struct btf_type *type;
997 const struct btf_type *value_type;
999 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1004 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1005 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1006 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1007 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1008 bool bpf_struct_ops_get(const void *kdata);
1009 void bpf_struct_ops_put(const void *kdata);
1010 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1012 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs,
1013 struct bpf_prog *prog,
1014 const struct btf_func_model *model,
1015 void *image, void *image_end);
1016 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1018 if (owner == BPF_MODULE_OWNER)
1019 return bpf_struct_ops_get(data);
1021 return try_module_get(owner);
1023 static inline void bpf_module_put(const void *data, struct module *owner)
1025 if (owner == BPF_MODULE_OWNER)
1026 bpf_struct_ops_put(data);
1032 /* Define it here to avoid the use of forward declaration */
1033 struct bpf_dummy_ops_state {
1037 struct bpf_dummy_ops {
1038 int (*test_1)(struct bpf_dummy_ops_state *cb);
1039 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1040 char a3, unsigned long a4);
1043 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1044 union bpf_attr __user *uattr);
1047 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1051 static inline void bpf_struct_ops_init(struct btf *btf,
1052 struct bpf_verifier_log *log)
1055 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1057 return try_module_get(owner);
1059 static inline void bpf_module_put(const void *data, struct module *owner)
1063 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1075 struct bpf_array_aux *aux;
1077 char value[0] __aligned(8);
1078 void *ptrs[0] __aligned(8);
1079 void __percpu *pptrs[0] __aligned(8);
1083 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1084 #define MAX_TAIL_CALL_CNT 32
1086 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1087 BPF_F_RDONLY_PROG | \
1091 #define BPF_MAP_CAN_READ BIT(0)
1092 #define BPF_MAP_CAN_WRITE BIT(1)
1094 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1096 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1098 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1101 if (access_flags & BPF_F_RDONLY_PROG)
1102 return BPF_MAP_CAN_READ;
1103 else if (access_flags & BPF_F_WRONLY_PROG)
1104 return BPF_MAP_CAN_WRITE;
1106 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1109 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1111 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1112 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1115 struct bpf_event_entry {
1116 struct perf_event *event;
1117 struct file *perf_file;
1118 struct file *map_file;
1119 struct rcu_head rcu;
1122 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
1123 int bpf_prog_calc_tag(struct bpf_prog *fp);
1125 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1126 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1128 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1129 unsigned long off, unsigned long len);
1130 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1131 const struct bpf_insn *src,
1132 struct bpf_insn *dst,
1133 struct bpf_prog *prog,
1136 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1137 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1139 /* an array of programs to be executed under rcu_lock.
1142 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run);
1144 * the structure returned by bpf_prog_array_alloc() should be populated
1145 * with program pointers and the last pointer must be NULL.
1146 * The user has to keep refcnt on the program and make sure the program
1147 * is removed from the array before bpf_prog_put().
1148 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1149 * since other cpus are walking the array of pointers in parallel.
1151 struct bpf_prog_array_item {
1152 struct bpf_prog *prog;
1154 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1159 struct bpf_prog_array {
1160 struct rcu_head rcu;
1161 struct bpf_prog_array_item items[];
1164 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1165 void bpf_prog_array_free(struct bpf_prog_array *progs);
1166 int bpf_prog_array_length(struct bpf_prog_array *progs);
1167 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1168 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1169 __u32 __user *prog_ids, u32 cnt);
1171 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1172 struct bpf_prog *old_prog);
1173 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1174 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1175 struct bpf_prog *prog);
1176 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1177 u32 *prog_ids, u32 request_cnt,
1179 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1180 struct bpf_prog *exclude_prog,
1181 struct bpf_prog *include_prog,
1183 struct bpf_prog_array **new_array);
1185 struct bpf_run_ctx {};
1187 struct bpf_cg_run_ctx {
1188 struct bpf_run_ctx run_ctx;
1189 const struct bpf_prog_array_item *prog_item;
1192 struct bpf_trace_run_ctx {
1193 struct bpf_run_ctx run_ctx;
1197 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1199 struct bpf_run_ctx *old_ctx = NULL;
1201 #ifdef CONFIG_BPF_SYSCALL
1202 old_ctx = current->bpf_ctx;
1203 current->bpf_ctx = new_ctx;
1208 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1210 #ifdef CONFIG_BPF_SYSCALL
1211 current->bpf_ctx = old_ctx;
1215 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1216 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1217 /* BPF program asks to set CN on the packet. */
1218 #define BPF_RET_SET_CN (1 << 0)
1220 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1222 static __always_inline u32
1223 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu,
1224 const void *ctx, bpf_prog_run_fn run_prog,
1227 const struct bpf_prog_array_item *item;
1228 const struct bpf_prog *prog;
1229 const struct bpf_prog_array *array;
1230 struct bpf_run_ctx *old_run_ctx;
1231 struct bpf_cg_run_ctx run_ctx;
1237 array = rcu_dereference(array_rcu);
1238 item = &array->items[0];
1239 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1240 while ((prog = READ_ONCE(item->prog))) {
1241 run_ctx.prog_item = item;
1242 func_ret = run_prog(prog, ctx);
1243 ret &= (func_ret & 1);
1244 *(ret_flags) |= (func_ret >> 1);
1247 bpf_reset_run_ctx(old_run_ctx);
1253 static __always_inline u32
1254 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu,
1255 const void *ctx, bpf_prog_run_fn run_prog)
1257 const struct bpf_prog_array_item *item;
1258 const struct bpf_prog *prog;
1259 const struct bpf_prog_array *array;
1260 struct bpf_run_ctx *old_run_ctx;
1261 struct bpf_cg_run_ctx run_ctx;
1266 array = rcu_dereference(array_rcu);
1267 item = &array->items[0];
1268 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1269 while ((prog = READ_ONCE(item->prog))) {
1270 run_ctx.prog_item = item;
1271 ret &= run_prog(prog, ctx);
1274 bpf_reset_run_ctx(old_run_ctx);
1280 static __always_inline u32
1281 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu,
1282 const void *ctx, bpf_prog_run_fn run_prog)
1284 const struct bpf_prog_array_item *item;
1285 const struct bpf_prog *prog;
1286 const struct bpf_prog_array *array;
1287 struct bpf_run_ctx *old_run_ctx;
1288 struct bpf_trace_run_ctx run_ctx;
1293 array = rcu_dereference(array_rcu);
1294 if (unlikely(!array))
1296 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1297 item = &array->items[0];
1298 while ((prog = READ_ONCE(item->prog))) {
1299 run_ctx.bpf_cookie = item->bpf_cookie;
1300 ret &= run_prog(prog, ctx);
1303 bpf_reset_run_ctx(old_run_ctx);
1310 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1311 * so BPF programs can request cwr for TCP packets.
1313 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1314 * packet. This macro changes the behavior so the low order bit
1315 * indicates whether the packet should be dropped (0) or not (1)
1316 * and the next bit is a congestion notification bit. This could be
1317 * used by TCP to call tcp_enter_cwr()
1319 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1322 * 2: drop packet and cn
1323 * 3: keep packet and cn
1325 * This macro then converts it to one of the NET_XMIT or an error
1326 * code that is then interpreted as drop packet (and no cn):
1327 * 0: NET_XMIT_SUCCESS skb should be transmitted
1328 * 1: NET_XMIT_DROP skb should be dropped and cn
1329 * 2: NET_XMIT_CN skb should be transmitted and cn
1330 * 3: -EPERM skb should be dropped
1332 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1337 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, &_flags); \
1338 _cn = _flags & BPF_RET_SET_CN; \
1340 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1342 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1346 #ifdef CONFIG_BPF_SYSCALL
1347 DECLARE_PER_CPU(int, bpf_prog_active);
1348 extern struct mutex bpf_stats_enabled_mutex;
1351 * Block execution of BPF programs attached to instrumentation (perf,
1352 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1353 * these events can happen inside a region which holds a map bucket lock
1354 * and can deadlock on it.
1356 * Use the preemption safe inc/dec variants on RT because migrate disable
1357 * is preemptible on RT and preemption in the middle of the RMW operation
1358 * might lead to inconsistent state. Use the raw variants for non RT
1359 * kernels as migrate_disable() maps to preempt_disable() so the slightly
1360 * more expensive save operation can be avoided.
1362 static inline void bpf_disable_instrumentation(void)
1365 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1366 this_cpu_inc(bpf_prog_active);
1368 __this_cpu_inc(bpf_prog_active);
1371 static inline void bpf_enable_instrumentation(void)
1373 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1374 this_cpu_dec(bpf_prog_active);
1376 __this_cpu_dec(bpf_prog_active);
1380 extern const struct file_operations bpf_map_fops;
1381 extern const struct file_operations bpf_prog_fops;
1382 extern const struct file_operations bpf_iter_fops;
1384 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1385 extern const struct bpf_prog_ops _name ## _prog_ops; \
1386 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1387 #define BPF_MAP_TYPE(_id, _ops) \
1388 extern const struct bpf_map_ops _ops;
1389 #define BPF_LINK_TYPE(_id, _name)
1390 #include <linux/bpf_types.h>
1391 #undef BPF_PROG_TYPE
1393 #undef BPF_LINK_TYPE
1395 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1396 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1397 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1399 struct bpf_prog *bpf_prog_get(u32 ufd);
1400 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1402 void bpf_prog_add(struct bpf_prog *prog, int i);
1403 void bpf_prog_sub(struct bpf_prog *prog, int i);
1404 void bpf_prog_inc(struct bpf_prog *prog);
1405 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1406 void bpf_prog_put(struct bpf_prog *prog);
1408 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1409 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1411 struct bpf_map *bpf_map_get(u32 ufd);
1412 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1413 struct bpf_map *__bpf_map_get(struct fd f);
1414 void bpf_map_inc(struct bpf_map *map);
1415 void bpf_map_inc_with_uref(struct bpf_map *map);
1416 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1417 void bpf_map_put_with_uref(struct bpf_map *map);
1418 void bpf_map_put(struct bpf_map *map);
1419 void *bpf_map_area_alloc(u64 size, int numa_node);
1420 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1421 void bpf_map_area_free(void *base);
1422 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1423 int generic_map_lookup_batch(struct bpf_map *map,
1424 const union bpf_attr *attr,
1425 union bpf_attr __user *uattr);
1426 int generic_map_update_batch(struct bpf_map *map,
1427 const union bpf_attr *attr,
1428 union bpf_attr __user *uattr);
1429 int generic_map_delete_batch(struct bpf_map *map,
1430 const union bpf_attr *attr,
1431 union bpf_attr __user *uattr);
1432 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1433 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1435 #ifdef CONFIG_MEMCG_KMEM
1436 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1438 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1439 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1440 size_t align, gfp_t flags);
1442 static inline void *
1443 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1446 return kmalloc_node(size, flags, node);
1449 static inline void *
1450 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1452 return kzalloc(size, flags);
1455 static inline void __percpu *
1456 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
1459 return __alloc_percpu_gfp(size, align, flags);
1463 extern int sysctl_unprivileged_bpf_disabled;
1465 static inline bool bpf_allow_ptr_leaks(void)
1467 return perfmon_capable();
1470 static inline bool bpf_allow_uninit_stack(void)
1472 return perfmon_capable();
1475 static inline bool bpf_allow_ptr_to_map_access(void)
1477 return perfmon_capable();
1480 static inline bool bpf_bypass_spec_v1(void)
1482 return perfmon_capable();
1485 static inline bool bpf_bypass_spec_v4(void)
1487 return perfmon_capable();
1490 int bpf_map_new_fd(struct bpf_map *map, int flags);
1491 int bpf_prog_new_fd(struct bpf_prog *prog);
1493 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1494 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1495 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1496 int bpf_link_settle(struct bpf_link_primer *primer);
1497 void bpf_link_cleanup(struct bpf_link_primer *primer);
1498 void bpf_link_inc(struct bpf_link *link);
1499 void bpf_link_put(struct bpf_link *link);
1500 int bpf_link_new_fd(struct bpf_link *link);
1501 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1502 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1504 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1505 int bpf_obj_get_user(const char __user *pathname, int flags);
1507 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1508 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1509 extern int bpf_iter_ ## target(args); \
1510 int __init bpf_iter_ ## target(args) { return 0; }
1512 struct bpf_iter_aux_info {
1513 struct bpf_map *map;
1516 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1517 union bpf_iter_link_info *linfo,
1518 struct bpf_iter_aux_info *aux);
1519 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1520 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1521 struct seq_file *seq);
1522 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1523 struct bpf_link_info *info);
1524 typedef const struct bpf_func_proto *
1525 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
1526 const struct bpf_prog *prog);
1528 enum bpf_iter_feature {
1529 BPF_ITER_RESCHED = BIT(0),
1532 #define BPF_ITER_CTX_ARG_MAX 2
1533 struct bpf_iter_reg {
1535 bpf_iter_attach_target_t attach_target;
1536 bpf_iter_detach_target_t detach_target;
1537 bpf_iter_show_fdinfo_t show_fdinfo;
1538 bpf_iter_fill_link_info_t fill_link_info;
1539 bpf_iter_get_func_proto_t get_func_proto;
1540 u32 ctx_arg_info_size;
1542 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1543 const struct bpf_iter_seq_info *seq_info;
1546 struct bpf_iter_meta {
1547 __bpf_md_ptr(struct seq_file *, seq);
1552 struct bpf_iter__bpf_map_elem {
1553 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1554 __bpf_md_ptr(struct bpf_map *, map);
1555 __bpf_md_ptr(void *, key);
1556 __bpf_md_ptr(void *, value);
1559 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1560 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1561 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1562 const struct bpf_func_proto *
1563 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
1564 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
1565 int bpf_iter_new_fd(struct bpf_link *link);
1566 bool bpf_link_is_iter(struct bpf_link *link);
1567 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1568 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1569 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1570 struct seq_file *seq);
1571 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1572 struct bpf_link_info *info);
1574 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
1575 struct bpf_func_state *caller,
1576 struct bpf_func_state *callee);
1578 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1579 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1580 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1582 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1585 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1587 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1588 void *key, void *value, u64 map_flags);
1589 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1590 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1591 void *key, void *value, u64 map_flags);
1592 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1594 int bpf_get_file_flag(int flags);
1595 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
1596 size_t actual_size);
1598 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1599 * forced to use 'long' read/writes to try to atomically copy long counters.
1600 * Best-effort only. No barriers here, since it _will_ race with concurrent
1601 * updates from BPF programs. Called from bpf syscall and mostly used with
1602 * size 8 or 16 bytes, so ask compiler to inline it.
1604 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1606 const long *lsrc = src;
1609 size /= sizeof(long);
1614 /* verify correctness of eBPF program */
1615 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
1617 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1618 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1621 struct btf *bpf_get_btf_vmlinux(void);
1626 struct bpf_dtab_netdev;
1627 struct bpf_cpu_map_entry;
1629 void __dev_flush(void);
1630 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1631 struct net_device *dev_rx);
1632 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1633 struct net_device *dev_rx);
1634 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1635 struct bpf_map *map, bool exclude_ingress);
1636 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1637 struct bpf_prog *xdp_prog);
1638 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1639 struct bpf_prog *xdp_prog, struct bpf_map *map,
1640 bool exclude_ingress);
1642 void __cpu_map_flush(void);
1643 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1644 struct net_device *dev_rx);
1645 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1646 struct sk_buff *skb);
1648 /* Return map's numa specified by userspace */
1649 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1651 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1652 attr->numa_node : NUMA_NO_NODE;
1655 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1656 int array_map_alloc_check(union bpf_attr *attr);
1658 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1659 union bpf_attr __user *uattr);
1660 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1661 union bpf_attr __user *uattr);
1662 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1663 const union bpf_attr *kattr,
1664 union bpf_attr __user *uattr);
1665 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1666 const union bpf_attr *kattr,
1667 union bpf_attr __user *uattr);
1668 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1669 const union bpf_attr *kattr,
1670 union bpf_attr __user *uattr);
1671 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1672 const union bpf_attr *kattr,
1673 union bpf_attr __user *uattr);
1674 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id, struct module *owner);
1675 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1676 const struct bpf_prog *prog,
1677 struct bpf_insn_access_aux *info);
1679 static inline bool bpf_tracing_ctx_access(int off, int size,
1680 enum bpf_access_type type)
1682 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
1684 if (type != BPF_READ)
1686 if (off % size != 0)
1691 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
1692 enum bpf_access_type type,
1693 const struct bpf_prog *prog,
1694 struct bpf_insn_access_aux *info)
1696 if (!bpf_tracing_ctx_access(off, size, type))
1698 return btf_ctx_access(off, size, type, prog, info);
1701 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf,
1702 const struct btf_type *t, int off, int size,
1703 enum bpf_access_type atype,
1705 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1706 const struct btf *btf, u32 id, int off,
1707 const struct btf *need_btf, u32 need_type_id);
1709 int btf_distill_func_proto(struct bpf_verifier_log *log,
1711 const struct btf_type *func_proto,
1712 const char *func_name,
1713 struct btf_func_model *m);
1715 struct bpf_reg_state;
1716 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
1717 struct bpf_reg_state *regs);
1718 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
1719 const struct btf *btf, u32 func_id,
1720 struct bpf_reg_state *regs);
1721 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1722 struct bpf_reg_state *reg);
1723 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1724 struct btf *btf, const struct btf_type *t);
1726 struct bpf_prog *bpf_prog_by_id(u32 id);
1727 struct bpf_link *bpf_link_by_id(u32 id);
1729 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1730 void bpf_task_storage_free(struct task_struct *task);
1731 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
1732 const struct btf_func_model *
1733 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1734 const struct bpf_insn *insn);
1735 #else /* !CONFIG_BPF_SYSCALL */
1736 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1738 return ERR_PTR(-EOPNOTSUPP);
1741 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1742 enum bpf_prog_type type,
1745 return ERR_PTR(-EOPNOTSUPP);
1748 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1752 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1756 static inline void bpf_prog_put(struct bpf_prog *prog)
1760 static inline void bpf_prog_inc(struct bpf_prog *prog)
1764 static inline struct bpf_prog *__must_check
1765 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1767 return ERR_PTR(-EOPNOTSUPP);
1770 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1771 const struct bpf_link_ops *ops,
1772 struct bpf_prog *prog)
1776 static inline int bpf_link_prime(struct bpf_link *link,
1777 struct bpf_link_primer *primer)
1782 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1787 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1791 static inline void bpf_link_inc(struct bpf_link *link)
1795 static inline void bpf_link_put(struct bpf_link *link)
1799 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1804 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1809 static inline void __dev_flush(void)
1814 struct bpf_dtab_netdev;
1815 struct bpf_cpu_map_entry;
1818 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1819 struct net_device *dev_rx)
1825 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1826 struct net_device *dev_rx)
1832 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1833 struct bpf_map *map, bool exclude_ingress)
1840 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1841 struct sk_buff *skb,
1842 struct bpf_prog *xdp_prog)
1848 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1849 struct bpf_prog *xdp_prog, struct bpf_map *map,
1850 bool exclude_ingress)
1855 static inline void __cpu_map_flush(void)
1859 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1860 struct xdp_buff *xdp,
1861 struct net_device *dev_rx)
1866 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1867 struct sk_buff *skb)
1872 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1877 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1878 enum bpf_prog_type type)
1880 return ERR_PTR(-EOPNOTSUPP);
1883 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1884 const union bpf_attr *kattr,
1885 union bpf_attr __user *uattr)
1890 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1891 const union bpf_attr *kattr,
1892 union bpf_attr __user *uattr)
1897 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1898 const union bpf_attr *kattr,
1899 union bpf_attr __user *uattr)
1904 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1905 const union bpf_attr *kattr,
1906 union bpf_attr __user *uattr)
1911 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1912 const union bpf_attr *kattr,
1913 union bpf_attr __user *uattr)
1918 static inline bool bpf_prog_test_check_kfunc_call(u32 kfunc_id,
1919 struct module *owner)
1924 static inline void bpf_map_put(struct bpf_map *map)
1928 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1930 return ERR_PTR(-ENOTSUPP);
1933 static inline const struct bpf_func_proto *
1934 bpf_base_func_proto(enum bpf_func_id func_id)
1939 static inline void bpf_task_storage_free(struct task_struct *task)
1943 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
1948 static inline const struct btf_func_model *
1949 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1950 const struct bpf_insn *insn)
1954 #endif /* CONFIG_BPF_SYSCALL */
1956 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
1957 struct btf_mod_pair *used_btfs, u32 len);
1959 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1960 enum bpf_prog_type type)
1962 return bpf_prog_get_type_dev(ufd, type, false);
1965 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1966 struct bpf_map **used_maps, u32 len);
1968 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1970 int bpf_prog_offload_compile(struct bpf_prog *prog);
1971 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1972 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1973 struct bpf_prog *prog);
1975 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1977 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1978 int bpf_map_offload_update_elem(struct bpf_map *map,
1979 void *key, void *value, u64 flags);
1980 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1981 int bpf_map_offload_get_next_key(struct bpf_map *map,
1982 void *key, void *next_key);
1984 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1986 struct bpf_offload_dev *
1987 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1988 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1989 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1990 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1991 struct net_device *netdev);
1992 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1993 struct net_device *netdev);
1994 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
1996 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
1997 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
1999 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2001 return aux->offload_requested;
2004 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2006 return unlikely(map->ops == &bpf_map_offload_ops);
2009 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2010 void bpf_map_offload_map_free(struct bpf_map *map);
2011 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2012 const union bpf_attr *kattr,
2013 union bpf_attr __user *uattr);
2015 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2016 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2017 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2018 void sock_map_unhash(struct sock *sk);
2019 void sock_map_close(struct sock *sk, long timeout);
2021 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
2022 union bpf_attr *attr)
2027 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
2032 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2037 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2039 return ERR_PTR(-EOPNOTSUPP);
2042 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2046 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2047 const union bpf_attr *kattr,
2048 union bpf_attr __user *uattr)
2053 #ifdef CONFIG_BPF_SYSCALL
2054 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2055 struct bpf_prog *prog)
2060 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2061 enum bpf_prog_type ptype)
2066 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2071 #endif /* CONFIG_BPF_SYSCALL */
2072 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2074 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2075 void bpf_sk_reuseport_detach(struct sock *sk);
2076 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2078 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2079 void *value, u64 map_flags);
2081 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2085 #ifdef CONFIG_BPF_SYSCALL
2086 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2087 void *key, void *value)
2092 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2093 void *key, void *value,
2098 #endif /* CONFIG_BPF_SYSCALL */
2099 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2101 /* verifier prototypes for helper functions called from eBPF programs */
2102 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2103 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2104 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2105 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2106 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2107 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2109 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2110 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2111 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2112 extern const struct bpf_func_proto bpf_tail_call_proto;
2113 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2114 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2115 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2116 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2117 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2118 extern const struct bpf_func_proto bpf_get_stackid_proto;
2119 extern const struct bpf_func_proto bpf_get_stack_proto;
2120 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2121 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2122 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2123 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2124 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2125 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2126 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2127 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2128 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2129 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2130 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2131 extern const struct bpf_func_proto bpf_spin_lock_proto;
2132 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2133 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2134 extern const struct bpf_func_proto bpf_strtol_proto;
2135 extern const struct bpf_func_proto bpf_strtoul_proto;
2136 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2137 extern const struct bpf_func_proto bpf_jiffies64_proto;
2138 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2139 extern const struct bpf_func_proto bpf_event_output_data_proto;
2140 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2141 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2142 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2143 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2144 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2145 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2146 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2147 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2148 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2149 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2150 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
2151 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2152 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2153 extern const struct bpf_func_proto bpf_snprintf_proto;
2154 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2155 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2156 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2157 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2158 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2159 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2160 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2161 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2162 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2163 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2164 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2165 extern const struct bpf_func_proto bpf_kallsyms_lookup_name_proto;
2166 extern const struct bpf_func_proto bpf_find_vma_proto;
2168 const struct bpf_func_proto *tracing_prog_func_proto(
2169 enum bpf_func_id func_id, const struct bpf_prog *prog);
2171 /* Shared helpers among cBPF and eBPF. */
2172 void bpf_user_rnd_init_once(void);
2173 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2174 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2176 #if defined(CONFIG_NET)
2177 bool bpf_sock_common_is_valid_access(int off, int size,
2178 enum bpf_access_type type,
2179 struct bpf_insn_access_aux *info);
2180 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2181 struct bpf_insn_access_aux *info);
2182 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2183 const struct bpf_insn *si,
2184 struct bpf_insn *insn_buf,
2185 struct bpf_prog *prog,
2188 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2189 enum bpf_access_type type,
2190 struct bpf_insn_access_aux *info)
2194 static inline bool bpf_sock_is_valid_access(int off, int size,
2195 enum bpf_access_type type,
2196 struct bpf_insn_access_aux *info)
2200 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2201 const struct bpf_insn *si,
2202 struct bpf_insn *insn_buf,
2203 struct bpf_prog *prog,
2211 struct sk_reuseport_kern {
2212 struct sk_buff *skb;
2214 struct sock *selected_sk;
2215 struct sock *migrating_sk;
2221 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2222 struct bpf_insn_access_aux *info);
2224 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2225 const struct bpf_insn *si,
2226 struct bpf_insn *insn_buf,
2227 struct bpf_prog *prog,
2230 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2231 struct bpf_insn_access_aux *info);
2233 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2234 const struct bpf_insn *si,
2235 struct bpf_insn *insn_buf,
2236 struct bpf_prog *prog,
2239 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2240 enum bpf_access_type type,
2241 struct bpf_insn_access_aux *info)
2246 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2247 const struct bpf_insn *si,
2248 struct bpf_insn *insn_buf,
2249 struct bpf_prog *prog,
2254 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2255 enum bpf_access_type type,
2256 struct bpf_insn_access_aux *info)
2261 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2262 const struct bpf_insn *si,
2263 struct bpf_insn *insn_buf,
2264 struct bpf_prog *prog,
2269 #endif /* CONFIG_INET */
2271 enum bpf_text_poke_type {
2276 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2277 void *addr1, void *addr2);
2280 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2282 #define MAX_BPRINTF_VARARGS 12
2284 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2285 u32 **bin_buf, u32 num_args);
2286 void bpf_bprintf_cleanup(void);
2288 #endif /* _LINUX_BPF_H */