1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of version 2 of the GNU General Public
5 * License as published by the Free Software Foundation.
6 */
7 #ifndef _LINUX_BPF_H
8 #define _LINUX_BPF_H 1
9
10 #include <uapi/linux/bpf.h>
11
12 #include <linux/workqueue.h>
13 #include <linux/file.h>
14 #include <linux/percpu.h>
15 #include <linux/err.h>
16 #include <linux/rbtree_latch.h>
17 #include <linux/numa.h>
18 #include <linux/wait.h>
19
20 struct bpf_verifier_env;
21 struct perf_event;
22 struct bpf_prog;
23 struct bpf_map;
24 struct sock;
25 struct seq_file;
26 struct btf_type;
27
28 /* map is generic key/value storage optionally accesible by eBPF programs */
29 struct bpf_map_ops {
30 /* funcs callable from userspace (via syscall) */
31 int (*map_alloc_check)(union bpf_attr *attr);
32 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
33 void (*map_release)(struct bpf_map *map, struct file *map_file);
34 void (*map_free)(struct bpf_map *map);
35 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
36 void (*map_release_uref)(struct bpf_map *map);
37 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
38
39 /* funcs callable from userspace and from eBPF programs */
40 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
41 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
42 int (*map_delete_elem)(struct bpf_map *map, void *key);
43
44 /* funcs called by prog_array and perf_event_array map */
45 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
46 int fd);
47 void (*map_fd_put_ptr)(void *ptr);
48 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
49 u32 (*map_fd_sys_lookup_elem)(void *ptr);
50 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
51 struct seq_file *m);
52 int (*map_check_btf)(const struct bpf_map *map,
53 const struct btf_type *key_type,
54 const struct btf_type *value_type);
55 };
56
57 struct bpf_map {
58 /* The first two cachelines with read-mostly members of which some
59 * are also accessed in fast-path (e.g. ops, max_entries).
60 */
61 const struct bpf_map_ops *ops ____cacheline_aligned;
62 struct bpf_map *inner_map_meta;
63 #ifdef CONFIG_SECURITY
64 void *security;
65 #endif
66 enum bpf_map_type map_type;
67 u32 key_size;
68 u32 value_size;
69 u32 max_entries;
70 u32 map_flags;
71 u32 pages;
72 u32 id;
73 int numa_node;
74 u32 btf_key_type_id;
75 u32 btf_value_type_id;
76 struct btf *btf;
77 bool unpriv_array;
78 /* 55 bytes hole */
79
80 /* The 3rd and 4th cacheline with misc members to avoid false sharing
81 * particularly with refcounting.
82 */
83 struct user_struct *user ____cacheline_aligned;
84 atomic_t refcnt;
85 atomic_t usercnt;
86 struct work_struct work;
87 char name[BPF_OBJ_NAME_LEN];
88 };
89
90 struct bpf_offload_dev;
91 struct bpf_offloaded_map;
92
93 struct bpf_map_dev_ops {
94 int (*map_get_next_key)(struct bpf_offloaded_map *map,
95 void *key, void *next_key);
96 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
97 void *key, void *value);
98 int (*map_update_elem)(struct bpf_offloaded_map *map,
99 void *key, void *value, u64 flags);
100 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
101 };
102
103 struct bpf_offloaded_map {
104 struct bpf_map map;
105 struct net_device *netdev;
106 const struct bpf_map_dev_ops *dev_ops;
107 void *dev_priv;
108 struct list_head offloads;
109 };
110
map_to_offmap(struct bpf_map * map)111 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
112 {
113 return container_of(map, struct bpf_offloaded_map, map);
114 }
115
bpf_map_offload_neutral(const struct bpf_map * map)116 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
117 {
118 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
119 }
120
bpf_map_support_seq_show(const struct bpf_map * map)121 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
122 {
123 return map->btf && map->ops->map_seq_show_elem;
124 }
125
126 int map_check_no_btf(const struct bpf_map *map,
127 const struct btf_type *key_type,
128 const struct btf_type *value_type);
129
130 extern const struct bpf_map_ops bpf_map_offload_ops;
131
132 /* function argument constraints */
133 enum bpf_arg_type {
134 ARG_DONTCARE = 0, /* unused argument in helper function */
135
136 /* the following constraints used to prototype
137 * bpf_map_lookup/update/delete_elem() functions
138 */
139 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
140 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
141 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
142
143 /* the following constraints used to prototype bpf_memcmp() and other
144 * functions that access data on eBPF program stack
145 */
146 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
147 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
148 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
149 * helper function must fill all bytes or clear
150 * them in error case.
151 */
152
153 ARG_CONST_SIZE, /* number of bytes accessed from memory */
154 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
155
156 ARG_PTR_TO_CTX, /* pointer to context */
157 ARG_ANYTHING, /* any (initialized) argument is ok */
158 };
159
160 /* type of values returned from helper functions */
161 enum bpf_return_type {
162 RET_INTEGER, /* function returns integer */
163 RET_VOID, /* function doesn't return anything */
164 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
165 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
166 };
167
168 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
169 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
170 * instructions after verifying
171 */
172 struct bpf_func_proto {
173 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
174 bool gpl_only;
175 bool pkt_access;
176 enum bpf_return_type ret_type;
177 enum bpf_arg_type arg1_type;
178 enum bpf_arg_type arg2_type;
179 enum bpf_arg_type arg3_type;
180 enum bpf_arg_type arg4_type;
181 enum bpf_arg_type arg5_type;
182 };
183
184 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
185 * the first argument to eBPF programs.
186 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
187 */
188 struct bpf_context;
189
190 enum bpf_access_type {
191 BPF_READ = 1,
192 BPF_WRITE = 2
193 };
194
195 /* types of values stored in eBPF registers */
196 /* Pointer types represent:
197 * pointer
198 * pointer + imm
199 * pointer + (u16) var
200 * pointer + (u16) var + imm
201 * if (range > 0) then [ptr, ptr + range - off) is safe to access
202 * if (id > 0) means that some 'var' was added
203 * if (off > 0) means that 'imm' was added
204 */
205 enum bpf_reg_type {
206 NOT_INIT = 0, /* nothing was written into register */
207 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
208 PTR_TO_CTX, /* reg points to bpf_context */
209 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
210 PTR_TO_MAP_VALUE, /* reg points to map element value */
211 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
212 PTR_TO_STACK, /* reg == frame_pointer + offset */
213 PTR_TO_PACKET_META, /* skb->data - meta_len */
214 PTR_TO_PACKET, /* reg points to skb->data */
215 PTR_TO_PACKET_END, /* skb->data + headlen */
216 };
217
218 /* The information passed from prog-specific *_is_valid_access
219 * back to the verifier.
220 */
221 struct bpf_insn_access_aux {
222 enum bpf_reg_type reg_type;
223 int ctx_field_size;
224 };
225
226 static inline void
bpf_ctx_record_field_size(struct bpf_insn_access_aux * aux,u32 size)227 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
228 {
229 aux->ctx_field_size = size;
230 }
231
232 struct bpf_prog_ops {
233 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
234 union bpf_attr __user *uattr);
235 };
236
237 struct bpf_verifier_ops {
238 /* return eBPF function prototype for verification */
239 const struct bpf_func_proto *
240 (*get_func_proto)(enum bpf_func_id func_id,
241 const struct bpf_prog *prog);
242
243 /* return true if 'size' wide access at offset 'off' within bpf_context
244 * with 'type' (read or write) is allowed
245 */
246 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
247 const struct bpf_prog *prog,
248 struct bpf_insn_access_aux *info);
249 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
250 const struct bpf_prog *prog);
251 int (*gen_ld_abs)(const struct bpf_insn *orig,
252 struct bpf_insn *insn_buf);
253 u32 (*convert_ctx_access)(enum bpf_access_type type,
254 const struct bpf_insn *src,
255 struct bpf_insn *dst,
256 struct bpf_prog *prog, u32 *target_size);
257 };
258
259 struct bpf_prog_offload_ops {
260 int (*insn_hook)(struct bpf_verifier_env *env,
261 int insn_idx, int prev_insn_idx);
262 };
263
264 struct bpf_prog_offload {
265 struct bpf_prog *prog;
266 struct net_device *netdev;
267 void *dev_priv;
268 struct list_head offloads;
269 bool dev_state;
270 const struct bpf_prog_offload_ops *dev_ops;
271 void *jited_image;
272 u32 jited_len;
273 };
274
275 struct bpf_prog_aux {
276 atomic_t refcnt;
277 u32 used_map_cnt;
278 u32 max_ctx_offset;
279 u32 stack_depth;
280 u32 id;
281 u32 func_cnt;
282 bool offload_requested;
283 struct bpf_prog **func;
284 void *jit_data; /* JIT specific data. arch dependent */
285 struct latch_tree_node ksym_tnode;
286 struct list_head ksym_lnode;
287 const struct bpf_prog_ops *ops;
288 struct bpf_map **used_maps;
289 struct bpf_prog *prog;
290 struct user_struct *user;
291 u64 load_time; /* ns since boottime */
292 struct bpf_map *cgroup_storage;
293 char name[BPF_OBJ_NAME_LEN];
294 #ifdef CONFIG_SECURITY
295 void *security;
296 #endif
297 struct bpf_prog_offload *offload;
298 union {
299 struct work_struct work;
300 struct rcu_head rcu;
301 };
302 };
303
304 struct bpf_array {
305 struct bpf_map map;
306 u32 elem_size;
307 u32 index_mask;
308 /* 'ownership' of prog_array is claimed by the first program that
309 * is going to use this map or by the first program which FD is stored
310 * in the map to make sure that all callers and callees have the same
311 * prog_type and JITed flag
312 */
313 enum bpf_prog_type owner_prog_type;
314 bool owner_jited;
315 union {
316 char value[0] __aligned(8);
317 void *ptrs[0] __aligned(8);
318 void __percpu *pptrs[0] __aligned(8);
319 };
320 };
321
322 #define MAX_TAIL_CALL_CNT 32
323
324 struct bpf_event_entry {
325 struct perf_event *event;
326 struct file *perf_file;
327 struct file *map_file;
328 struct rcu_head rcu;
329 };
330
331 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
332 int bpf_prog_calc_tag(struct bpf_prog *fp);
333
334 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
335
336 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
337 unsigned long off, unsigned long len);
338
339 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
340 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
341
342 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
343 union bpf_attr __user *uattr);
344 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
345 union bpf_attr __user *uattr);
346
347 /* an array of programs to be executed under rcu_lock.
348 *
349 * Typical usage:
350 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
351 *
352 * the structure returned by bpf_prog_array_alloc() should be populated
353 * with program pointers and the last pointer must be NULL.
354 * The user has to keep refcnt on the program and make sure the program
355 * is removed from the array before bpf_prog_put().
356 * The 'struct bpf_prog_array *' should only be replaced with xchg()
357 * since other cpus are walking the array of pointers in parallel.
358 */
359 struct bpf_prog_array_item {
360 struct bpf_prog *prog;
361 struct bpf_cgroup_storage *cgroup_storage;
362 };
363
364 struct bpf_prog_array {
365 struct rcu_head rcu;
366 struct bpf_prog_array_item items[0];
367 };
368
369 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
370 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs);
371 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs);
372 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
373 __u32 __user *prog_ids, u32 cnt);
374
375 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs,
376 struct bpf_prog *old_prog);
377 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array,
378 u32 *prog_ids, u32 request_cnt,
379 u32 *prog_cnt);
380 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
381 struct bpf_prog *exclude_prog,
382 struct bpf_prog *include_prog,
383 struct bpf_prog_array **new_array);
384
385 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \
386 ({ \
387 struct bpf_prog_array_item *_item; \
388 struct bpf_prog *_prog; \
389 struct bpf_prog_array *_array; \
390 u32 _ret = 1; \
391 preempt_disable(); \
392 rcu_read_lock(); \
393 _array = rcu_dereference(array); \
394 if (unlikely(check_non_null && !_array))\
395 goto _out; \
396 _item = &_array->items[0]; \
397 while ((_prog = READ_ONCE(_item->prog))) { \
398 bpf_cgroup_storage_set(_item->cgroup_storage); \
399 _ret &= func(_prog, ctx); \
400 _item++; \
401 } \
402 _out: \
403 rcu_read_unlock(); \
404 preempt_enable(); \
405 _ret; \
406 })
407
408 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \
409 __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
410
411 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
412 __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
413
414 #ifdef CONFIG_BPF_SYSCALL
415 DECLARE_PER_CPU(int, bpf_prog_active);
416
417 extern const struct file_operations bpf_map_fops;
418 extern const struct file_operations bpf_prog_fops;
419
420 #define BPF_PROG_TYPE(_id, _name) \
421 extern const struct bpf_prog_ops _name ## _prog_ops; \
422 extern const struct bpf_verifier_ops _name ## _verifier_ops;
423 #define BPF_MAP_TYPE(_id, _ops) \
424 extern const struct bpf_map_ops _ops;
425 #include <linux/bpf_types.h>
426 #undef BPF_PROG_TYPE
427 #undef BPF_MAP_TYPE
428
429 extern const struct bpf_prog_ops bpf_offload_prog_ops;
430 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
431 extern const struct bpf_verifier_ops xdp_analyzer_ops;
432
433 struct bpf_prog *bpf_prog_get(u32 ufd);
434 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
435 bool attach_drv);
436 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
437 void bpf_prog_sub(struct bpf_prog *prog, int i);
438 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
439 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
440 void bpf_prog_put(struct bpf_prog *prog);
441 int __bpf_prog_charge(struct user_struct *user, u32 pages);
442 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
443
444 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
445 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
446
447 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
448 struct bpf_map *__bpf_map_get(struct fd f);
449 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
450 void bpf_map_put_with_uref(struct bpf_map *map);
451 void bpf_map_put(struct bpf_map *map);
452 int bpf_map_precharge_memlock(u32 pages);
453 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
454 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
455 void *bpf_map_area_alloc(size_t size, int numa_node);
456 void bpf_map_area_free(void *base);
457 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
458
459 extern int sysctl_unprivileged_bpf_disabled;
460
461 int bpf_map_new_fd(struct bpf_map *map, int flags);
462 int bpf_prog_new_fd(struct bpf_prog *prog);
463
464 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
465 int bpf_obj_get_user(const char __user *pathname, int flags);
466
467 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
468 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
469 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
470 u64 flags);
471 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
472 u64 flags);
473
474 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
475
476 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
477 void *key, void *value, u64 map_flags);
478 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
479 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
480 void *key, void *value, u64 map_flags);
481 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
482
483 int bpf_get_file_flag(int flags);
484 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
485 size_t actual_size);
486
487 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
488 * forced to use 'long' read/writes to try to atomically copy long counters.
489 * Best-effort only. No barriers here, since it _will_ race with concurrent
490 * updates from BPF programs. Called from bpf syscall and mostly used with
491 * size 8 or 16 bytes, so ask compiler to inline it.
492 */
bpf_long_memcpy(void * dst,const void * src,u32 size)493 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
494 {
495 const long *lsrc = src;
496 long *ldst = dst;
497
498 size /= sizeof(long);
499 while (size--)
500 *ldst++ = *lsrc++;
501 }
502
503 /* verify correctness of eBPF program */
504 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
505 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
506
507 /* Map specifics */
508 struct xdp_buff;
509 struct sk_buff;
510
511 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
512 void __dev_map_insert_ctx(struct bpf_map *map, u32 index);
513 void __dev_map_flush(struct bpf_map *map);
514 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
515 struct net_device *dev_rx);
516 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
517 struct bpf_prog *xdp_prog);
518
519 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
520 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);
521 void __cpu_map_flush(struct bpf_map *map);
522 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
523 struct net_device *dev_rx);
524
525 /* Return map's numa specified by userspace */
bpf_map_attr_numa_node(const union bpf_attr * attr)526 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
527 {
528 return (attr->map_flags & BPF_F_NUMA_NODE) ?
529 attr->numa_node : NUMA_NO_NODE;
530 }
531
532 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
533 int array_map_alloc_check(union bpf_attr *attr);
534
535 #else /* !CONFIG_BPF_SYSCALL */
bpf_prog_get(u32 ufd)536 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
537 {
538 return ERR_PTR(-EOPNOTSUPP);
539 }
540
bpf_prog_get_type_dev(u32 ufd,enum bpf_prog_type type,bool attach_drv)541 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
542 enum bpf_prog_type type,
543 bool attach_drv)
544 {
545 return ERR_PTR(-EOPNOTSUPP);
546 }
547
bpf_prog_add(struct bpf_prog * prog,int i)548 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
549 int i)
550 {
551 return ERR_PTR(-EOPNOTSUPP);
552 }
553
bpf_prog_sub(struct bpf_prog * prog,int i)554 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
555 {
556 }
557
bpf_prog_put(struct bpf_prog * prog)558 static inline void bpf_prog_put(struct bpf_prog *prog)
559 {
560 }
561
bpf_prog_inc(struct bpf_prog * prog)562 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
563 {
564 return ERR_PTR(-EOPNOTSUPP);
565 }
566
567 static inline struct bpf_prog *__must_check
bpf_prog_inc_not_zero(struct bpf_prog * prog)568 bpf_prog_inc_not_zero(struct bpf_prog *prog)
569 {
570 return ERR_PTR(-EOPNOTSUPP);
571 }
572
__bpf_prog_charge(struct user_struct * user,u32 pages)573 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
574 {
575 return 0;
576 }
577
__bpf_prog_uncharge(struct user_struct * user,u32 pages)578 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
579 {
580 }
581
bpf_obj_get_user(const char __user * pathname,int flags)582 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
583 {
584 return -EOPNOTSUPP;
585 }
586
__dev_map_lookup_elem(struct bpf_map * map,u32 key)587 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map,
588 u32 key)
589 {
590 return NULL;
591 }
592
__dev_map_insert_ctx(struct bpf_map * map,u32 index)593 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index)
594 {
595 }
596
__dev_map_flush(struct bpf_map * map)597 static inline void __dev_map_flush(struct bpf_map *map)
598 {
599 }
600
601 struct xdp_buff;
602 struct bpf_dtab_netdev;
603
604 static inline
dev_map_enqueue(struct bpf_dtab_netdev * dst,struct xdp_buff * xdp,struct net_device * dev_rx)605 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
606 struct net_device *dev_rx)
607 {
608 return 0;
609 }
610
611 struct sk_buff;
612
dev_map_generic_redirect(struct bpf_dtab_netdev * dst,struct sk_buff * skb,struct bpf_prog * xdp_prog)613 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
614 struct sk_buff *skb,
615 struct bpf_prog *xdp_prog)
616 {
617 return 0;
618 }
619
620 static inline
__cpu_map_lookup_elem(struct bpf_map * map,u32 key)621 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
622 {
623 return NULL;
624 }
625
__cpu_map_insert_ctx(struct bpf_map * map,u32 index)626 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index)
627 {
628 }
629
__cpu_map_flush(struct bpf_map * map)630 static inline void __cpu_map_flush(struct bpf_map *map)
631 {
632 }
633
cpu_map_enqueue(struct bpf_cpu_map_entry * rcpu,struct xdp_buff * xdp,struct net_device * dev_rx)634 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
635 struct xdp_buff *xdp,
636 struct net_device *dev_rx)
637 {
638 return 0;
639 }
640
bpf_prog_get_type_path(const char * name,enum bpf_prog_type type)641 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
642 enum bpf_prog_type type)
643 {
644 return ERR_PTR(-EOPNOTSUPP);
645 }
646 #endif /* CONFIG_BPF_SYSCALL */
647
bpf_prog_get_type(u32 ufd,enum bpf_prog_type type)648 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
649 enum bpf_prog_type type)
650 {
651 return bpf_prog_get_type_dev(ufd, type, false);
652 }
653
654 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
655
656 int bpf_prog_offload_compile(struct bpf_prog *prog);
657 void bpf_prog_offload_destroy(struct bpf_prog *prog);
658 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
659 struct bpf_prog *prog);
660
661 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
662
663 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
664 int bpf_map_offload_update_elem(struct bpf_map *map,
665 void *key, void *value, u64 flags);
666 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
667 int bpf_map_offload_get_next_key(struct bpf_map *map,
668 void *key, void *next_key);
669
670 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
671
672 struct bpf_offload_dev *bpf_offload_dev_create(void);
673 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
674 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
675 struct net_device *netdev);
676 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
677 struct net_device *netdev);
678 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
679
680 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
681 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
682
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)683 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
684 {
685 return aux->offload_requested;
686 }
687
bpf_map_is_dev_bound(struct bpf_map * map)688 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
689 {
690 return unlikely(map->ops == &bpf_map_offload_ops);
691 }
692
693 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
694 void bpf_map_offload_map_free(struct bpf_map *map);
695 #else
bpf_prog_offload_init(struct bpf_prog * prog,union bpf_attr * attr)696 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
697 union bpf_attr *attr)
698 {
699 return -EOPNOTSUPP;
700 }
701
bpf_prog_is_dev_bound(struct bpf_prog_aux * aux)702 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
703 {
704 return false;
705 }
706
bpf_map_is_dev_bound(struct bpf_map * map)707 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
708 {
709 return false;
710 }
711
bpf_map_offload_map_alloc(union bpf_attr * attr)712 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
713 {
714 return ERR_PTR(-EOPNOTSUPP);
715 }
716
bpf_map_offload_map_free(struct bpf_map * map)717 static inline void bpf_map_offload_map_free(struct bpf_map *map)
718 {
719 }
720 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
721
722 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET)
723 struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
724 struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key);
725 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type);
726 int sockmap_get_from_fd(const union bpf_attr *attr, int type,
727 struct bpf_prog *prog);
728 #else
__sock_map_lookup_elem(struct bpf_map * map,u32 key)729 static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
730 {
731 return NULL;
732 }
733
__sock_hash_lookup_elem(struct bpf_map * map,void * key)734 static inline struct sock *__sock_hash_lookup_elem(struct bpf_map *map,
735 void *key)
736 {
737 return NULL;
738 }
739
sock_map_prog(struct bpf_map * map,struct bpf_prog * prog,u32 type)740 static inline int sock_map_prog(struct bpf_map *map,
741 struct bpf_prog *prog,
742 u32 type)
743 {
744 return -EOPNOTSUPP;
745 }
746
sockmap_get_from_fd(const union bpf_attr * attr,int type,struct bpf_prog * prog)747 static inline int sockmap_get_from_fd(const union bpf_attr *attr, int type,
748 struct bpf_prog *prog)
749 {
750 return -EINVAL;
751 }
752 #endif
753
754 #if defined(CONFIG_XDP_SOCKETS)
755 struct xdp_sock;
756 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key);
757 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
758 struct xdp_sock *xs);
759 void __xsk_map_flush(struct bpf_map *map);
760 #else
761 struct xdp_sock;
__xsk_map_lookup_elem(struct bpf_map * map,u32 key)762 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
763 u32 key)
764 {
765 return NULL;
766 }
767
__xsk_map_redirect(struct bpf_map * map,struct xdp_buff * xdp,struct xdp_sock * xs)768 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
769 struct xdp_sock *xs)
770 {
771 return -EOPNOTSUPP;
772 }
773
__xsk_map_flush(struct bpf_map * map)774 static inline void __xsk_map_flush(struct bpf_map *map)
775 {
776 }
777 #endif
778
779 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
780 void bpf_sk_reuseport_detach(struct sock *sk);
781 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
782 void *value);
783 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
784 void *value, u64 map_flags);
785 #else
bpf_sk_reuseport_detach(struct sock * sk)786 static inline void bpf_sk_reuseport_detach(struct sock *sk)
787 {
788 }
789
790 #ifdef CONFIG_BPF_SYSCALL
bpf_fd_reuseport_array_lookup_elem(struct bpf_map * map,void * key,void * value)791 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
792 void *key, void *value)
793 {
794 return -EOPNOTSUPP;
795 }
796
bpf_fd_reuseport_array_update_elem(struct bpf_map * map,void * key,void * value,u64 map_flags)797 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
798 void *key, void *value,
799 u64 map_flags)
800 {
801 return -EOPNOTSUPP;
802 }
803 #endif /* CONFIG_BPF_SYSCALL */
804 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
805
806 /* verifier prototypes for helper functions called from eBPF programs */
807 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
808 extern const struct bpf_func_proto bpf_map_update_elem_proto;
809 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
810
811 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
812 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
813 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
814 extern const struct bpf_func_proto bpf_tail_call_proto;
815 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
816 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
817 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
818 extern const struct bpf_func_proto bpf_get_current_comm_proto;
819 extern const struct bpf_func_proto bpf_get_stackid_proto;
820 extern const struct bpf_func_proto bpf_get_stack_proto;
821 extern const struct bpf_func_proto bpf_sock_map_update_proto;
822 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
823 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
824
825 extern const struct bpf_func_proto bpf_get_local_storage_proto;
826
827 /* Shared helpers among cBPF and eBPF. */
828 void bpf_user_rnd_init_once(void);
829 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
830
831 #endif /* _LINUX_BPF_H */
832