1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 */
4 #ifndef _LINUX_BPF_H
5 #define _LINUX_BPF_H 1
6
7 #include <uapi/linux/bpf.h>
8 #include <uapi/linux/filter.h>
9
10 #include <linux/workqueue.h>
11 #include <linux/file.h>
12 #include <linux/percpu.h>
13 #include <linux/err.h>
14 #include <linux/rbtree_latch.h>
15 #include <linux/numa.h>
16 #include <linux/mm_types.h>
17 #include <linux/wait.h>
18 #include <linux/refcount.h>
19 #include <linux/mutex.h>
20 #include <linux/module.h>
21 #include <linux/kallsyms.h>
22 #include <linux/capability.h>
23 #include <linux/sched/mm.h>
24 #include <linux/slab.h>
25 #include <linux/percpu-refcount.h>
26 #include <linux/stddef.h>
27 #include <linux/bpfptr.h>
28 #include <linux/btf.h>
29 #include <linux/rcupdate_trace.h>
30 #include <linux/static_call.h>
31 #include <linux/memcontrol.h>
32
33 struct bpf_verifier_env;
34 struct bpf_verifier_log;
35 struct perf_event;
36 struct bpf_prog;
37 struct bpf_prog_aux;
38 struct bpf_map;
39 struct sock;
40 struct seq_file;
41 struct btf;
42 struct btf_type;
43 struct exception_table_entry;
44 struct seq_operations;
45 struct bpf_iter_aux_info;
46 struct bpf_local_storage;
47 struct bpf_local_storage_map;
48 struct kobject;
49 struct mem_cgroup;
50 struct module;
51 struct bpf_func_state;
52 struct ftrace_ops;
53 struct cgroup;
54
55 extern struct idr btf_idr;
56 extern spinlock_t btf_idr_lock;
57 extern struct kobject *btf_kobj;
58 extern struct bpf_mem_alloc bpf_global_ma;
59 extern bool bpf_global_ma_set;
60
61 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
62 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
63 struct bpf_iter_aux_info *aux);
64 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
65 typedef unsigned int (*bpf_func_t)(const void *,
66 const struct bpf_insn *);
67 struct bpf_iter_seq_info {
68 const struct seq_operations *seq_ops;
69 bpf_iter_init_seq_priv_t init_seq_private;
70 bpf_iter_fini_seq_priv_t fini_seq_private;
71 u32 seq_priv_size;
72 };
73
74 /* map is generic key/value storage optionally accessible by eBPF programs */
75 struct bpf_map_ops {
76 /* funcs callable from userspace (via syscall) */
77 int (*map_alloc_check)(union bpf_attr *attr);
78 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
79 void (*map_release)(struct bpf_map *map, struct file *map_file);
80 void (*map_free)(struct bpf_map *map);
81 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
82 void (*map_release_uref)(struct bpf_map *map);
83 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
84 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
85 union bpf_attr __user *uattr);
86 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
87 void *value, u64 flags);
88 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
89 const union bpf_attr *attr,
90 union bpf_attr __user *uattr);
91 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
92 const union bpf_attr *attr,
93 union bpf_attr __user *uattr);
94 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
95 union bpf_attr __user *uattr);
96
97 /* funcs callable from userspace and from eBPF programs */
98 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
99 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
100 long (*map_delete_elem)(struct bpf_map *map, void *key);
101 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
102 long (*map_pop_elem)(struct bpf_map *map, void *value);
103 long (*map_peek_elem)(struct bpf_map *map, void *value);
104 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
105
106 /* funcs called by prog_array and perf_event_array map */
107 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
108 int fd);
109 /* If need_defer is true, the implementation should guarantee that
110 * the to-be-put element is still alive before the bpf program, which
111 * may manipulate it, exists.
112 */
113 void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
114 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
115 u32 (*map_fd_sys_lookup_elem)(void *ptr);
116 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
117 struct seq_file *m);
118 int (*map_check_btf)(const struct bpf_map *map,
119 const struct btf *btf,
120 const struct btf_type *key_type,
121 const struct btf_type *value_type);
122
123 /* Prog poke tracking helpers. */
124 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
125 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
126 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
127 struct bpf_prog *new);
128
129 /* Direct value access helpers. */
130 int (*map_direct_value_addr)(const struct bpf_map *map,
131 u64 *imm, u32 off);
132 int (*map_direct_value_meta)(const struct bpf_map *map,
133 u64 imm, u32 *off);
134 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
135 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
136 struct poll_table_struct *pts);
137
138 /* Functions called by bpf_local_storage maps */
139 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
140 void *owner, u32 size);
141 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
142 void *owner, u32 size);
143 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
144
145 /* Misc helpers.*/
146 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
147
148 /* map_meta_equal must be implemented for maps that can be
149 * used as an inner map. It is a runtime check to ensure
150 * an inner map can be inserted to an outer map.
151 *
152 * Some properties of the inner map has been used during the
153 * verification time. When inserting an inner map at the runtime,
154 * map_meta_equal has to ensure the inserting map has the same
155 * properties that the verifier has used earlier.
156 */
157 bool (*map_meta_equal)(const struct bpf_map *meta0,
158 const struct bpf_map *meta1);
159
160
161 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
162 struct bpf_func_state *caller,
163 struct bpf_func_state *callee);
164 long (*map_for_each_callback)(struct bpf_map *map,
165 bpf_callback_t callback_fn,
166 void *callback_ctx, u64 flags);
167
168 u64 (*map_mem_usage)(const struct bpf_map *map);
169
170 /* BTF id of struct allocated by map_alloc */
171 int *map_btf_id;
172
173 /* bpf_iter info used to open a seq_file */
174 const struct bpf_iter_seq_info *iter_seq_info;
175 };
176
177 enum {
178 /* Support at most 10 fields in a BTF type */
179 BTF_FIELDS_MAX = 10,
180 };
181
182 enum btf_field_type {
183 BPF_SPIN_LOCK = (1 << 0),
184 BPF_TIMER = (1 << 1),
185 BPF_KPTR_UNREF = (1 << 2),
186 BPF_KPTR_REF = (1 << 3),
187 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF,
188 BPF_LIST_HEAD = (1 << 4),
189 BPF_LIST_NODE = (1 << 5),
190 BPF_RB_ROOT = (1 << 6),
191 BPF_RB_NODE = (1 << 7),
192 BPF_GRAPH_NODE_OR_ROOT = BPF_LIST_NODE | BPF_LIST_HEAD |
193 BPF_RB_NODE | BPF_RB_ROOT,
194 BPF_REFCOUNT = (1 << 8),
195 };
196
197 typedef void (*btf_dtor_kfunc_t)(void *);
198
199 struct btf_field_kptr {
200 struct btf *btf;
201 struct module *module;
202 /* dtor used if btf_is_kernel(btf), otherwise the type is
203 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
204 */
205 btf_dtor_kfunc_t dtor;
206 u32 btf_id;
207 };
208
209 struct btf_field_graph_root {
210 struct btf *btf;
211 u32 value_btf_id;
212 u32 node_offset;
213 struct btf_record *value_rec;
214 };
215
216 struct btf_field {
217 u32 offset;
218 u32 size;
219 enum btf_field_type type;
220 union {
221 struct btf_field_kptr kptr;
222 struct btf_field_graph_root graph_root;
223 };
224 };
225
226 struct btf_record {
227 u32 cnt;
228 u32 field_mask;
229 int spin_lock_off;
230 int timer_off;
231 int refcount_off;
232 struct btf_field fields[];
233 };
234
235 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
236 struct bpf_rb_node_kern {
237 struct rb_node rb_node;
238 void *owner;
239 } __attribute__((aligned(8)));
240
241 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
242 struct bpf_list_node_kern {
243 struct list_head list_head;
244 void *owner;
245 } __attribute__((aligned(8)));
246
247 struct bpf_map {
248 /* The first two cachelines with read-mostly members of which some
249 * are also accessed in fast-path (e.g. ops, max_entries).
250 */
251 const struct bpf_map_ops *ops ____cacheline_aligned;
252 struct bpf_map *inner_map_meta;
253 #ifdef CONFIG_SECURITY
254 void *security;
255 #endif
256 enum bpf_map_type map_type;
257 u32 key_size;
258 u32 value_size;
259 u32 max_entries;
260 u64 map_extra; /* any per-map-type extra fields */
261 u32 map_flags;
262 u32 id;
263 struct btf_record *record;
264 int numa_node;
265 u32 btf_key_type_id;
266 u32 btf_value_type_id;
267 u32 btf_vmlinux_value_type_id;
268 struct btf *btf;
269 #ifdef CONFIG_MEMCG_KMEM
270 struct obj_cgroup *objcg;
271 #endif
272 char name[BPF_OBJ_NAME_LEN];
273 /* The 3rd and 4th cacheline with misc members to avoid false sharing
274 * particularly with refcounting.
275 */
276 atomic64_t refcnt ____cacheline_aligned;
277 atomic64_t usercnt;
278 /* rcu is used before freeing and work is only used during freeing */
279 union {
280 struct work_struct work;
281 struct rcu_head rcu;
282 };
283 struct mutex freeze_mutex;
284 atomic64_t writecnt;
285 /* 'Ownership' of program-containing map is claimed by the first program
286 * that is going to use this map or by the first program which FD is
287 * stored in the map to make sure that all callers and callees have the
288 * same prog type, JITed flag and xdp_has_frags flag.
289 */
290 struct {
291 spinlock_t lock;
292 enum bpf_prog_type type;
293 bool jited;
294 bool xdp_has_frags;
295 } owner;
296 bool bypass_spec_v1;
297 bool frozen; /* write-once; write-protected by freeze_mutex */
298 bool free_after_mult_rcu_gp;
299 bool free_after_rcu_gp;
300 atomic64_t sleepable_refcnt;
301 s64 __percpu *elem_count;
302 };
303
btf_field_type_name(enum btf_field_type type)304 static inline const char *btf_field_type_name(enum btf_field_type type)
305 {
306 switch (type) {
307 case BPF_SPIN_LOCK:
308 return "bpf_spin_lock";
309 case BPF_TIMER:
310 return "bpf_timer";
311 case BPF_KPTR_UNREF:
312 case BPF_KPTR_REF:
313 return "kptr";
314 case BPF_LIST_HEAD:
315 return "bpf_list_head";
316 case BPF_LIST_NODE:
317 return "bpf_list_node";
318 case BPF_RB_ROOT:
319 return "bpf_rb_root";
320 case BPF_RB_NODE:
321 return "bpf_rb_node";
322 case BPF_REFCOUNT:
323 return "bpf_refcount";
324 default:
325 WARN_ON_ONCE(1);
326 return "unknown";
327 }
328 }
329
btf_field_type_size(enum btf_field_type type)330 static inline u32 btf_field_type_size(enum btf_field_type type)
331 {
332 switch (type) {
333 case BPF_SPIN_LOCK:
334 return sizeof(struct bpf_spin_lock);
335 case BPF_TIMER:
336 return sizeof(struct bpf_timer);
337 case BPF_KPTR_UNREF:
338 case BPF_KPTR_REF:
339 return sizeof(u64);
340 case BPF_LIST_HEAD:
341 return sizeof(struct bpf_list_head);
342 case BPF_LIST_NODE:
343 return sizeof(struct bpf_list_node);
344 case BPF_RB_ROOT:
345 return sizeof(struct bpf_rb_root);
346 case BPF_RB_NODE:
347 return sizeof(struct bpf_rb_node);
348 case BPF_REFCOUNT:
349 return sizeof(struct bpf_refcount);
350 default:
351 WARN_ON_ONCE(1);
352 return 0;
353 }
354 }
355
btf_field_type_align(enum btf_field_type type)356 static inline u32 btf_field_type_align(enum btf_field_type type)
357 {
358 switch (type) {
359 case BPF_SPIN_LOCK:
360 return __alignof__(struct bpf_spin_lock);
361 case BPF_TIMER:
362 return __alignof__(struct bpf_timer);
363 case BPF_KPTR_UNREF:
364 case BPF_KPTR_REF:
365 return __alignof__(u64);
366 case BPF_LIST_HEAD:
367 return __alignof__(struct bpf_list_head);
368 case BPF_LIST_NODE:
369 return __alignof__(struct bpf_list_node);
370 case BPF_RB_ROOT:
371 return __alignof__(struct bpf_rb_root);
372 case BPF_RB_NODE:
373 return __alignof__(struct bpf_rb_node);
374 case BPF_REFCOUNT:
375 return __alignof__(struct bpf_refcount);
376 default:
377 WARN_ON_ONCE(1);
378 return 0;
379 }
380 }
381
bpf_obj_init_field(const struct btf_field * field,void * addr)382 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
383 {
384 memset(addr, 0, field->size);
385
386 switch (field->type) {
387 case BPF_REFCOUNT:
388 refcount_set((refcount_t *)addr, 1);
389 break;
390 case BPF_RB_NODE:
391 RB_CLEAR_NODE((struct rb_node *)addr);
392 break;
393 case BPF_LIST_HEAD:
394 case BPF_LIST_NODE:
395 INIT_LIST_HEAD((struct list_head *)addr);
396 break;
397 case BPF_RB_ROOT:
398 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
399 case BPF_SPIN_LOCK:
400 case BPF_TIMER:
401 case BPF_KPTR_UNREF:
402 case BPF_KPTR_REF:
403 break;
404 default:
405 WARN_ON_ONCE(1);
406 return;
407 }
408 }
409
btf_record_has_field(const struct btf_record * rec,enum btf_field_type type)410 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
411 {
412 if (IS_ERR_OR_NULL(rec))
413 return false;
414 return rec->field_mask & type;
415 }
416
bpf_obj_init(const struct btf_record * rec,void * obj)417 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
418 {
419 int i;
420
421 if (IS_ERR_OR_NULL(rec))
422 return;
423 for (i = 0; i < rec->cnt; i++)
424 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
425 }
426
427 /* 'dst' must be a temporary buffer and should not point to memory that is being
428 * used in parallel by a bpf program or bpf syscall, otherwise the access from
429 * the bpf program or bpf syscall may be corrupted by the reinitialization,
430 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
431 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
432 * program or bpf syscall.
433 */
check_and_init_map_value(struct bpf_map * map,void * dst)434 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
435 {
436 bpf_obj_init(map->record, dst);
437 }
438
439 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
440 * forced to use 'long' read/writes to try to atomically copy long counters.
441 * Best-effort only. No barriers here, since it _will_ race with concurrent
442 * updates from BPF programs. Called from bpf syscall and mostly used with
443 * size 8 or 16 bytes, so ask compiler to inline it.
444 */
bpf_long_memcpy(void * dst,const void * src,u32 size)445 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
446 {
447 const long *lsrc = src;
448 long *ldst = dst;
449
450 size /= sizeof(long);
451 while (size--)
452 data_race(*ldst++ = *lsrc++);
453 }
454
455 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
bpf_obj_memcpy(struct btf_record * rec,void * dst,void * src,u32 size,bool long_memcpy)456 static inline void bpf_obj_memcpy(struct btf_record *rec,
457 void *dst, void *src, u32 size,
458 bool long_memcpy)
459 {
460 u32 curr_off = 0;
461 int i;
462
463 if (IS_ERR_OR_NULL(rec)) {
464 if (long_memcpy)
465 bpf_long_memcpy(dst, src, round_up(size, 8));
466 else
467 memcpy(dst, src, size);
468 return;
469 }
470
471 for (i = 0; i < rec->cnt; i++) {
472 u32 next_off = rec->fields[i].offset;
473 u32 sz = next_off - curr_off;
474
475 memcpy(dst + curr_off, src + curr_off, sz);
476 curr_off += rec->fields[i].size + sz;
477 }
478 memcpy(dst + curr_off, src + curr_off, size - curr_off);
479 }
480
copy_map_value(struct bpf_map * map,void * dst,void * src)481 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
482 {
483 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
484 }
485
copy_map_value_long(struct bpf_map * map,void * dst,void * src)486 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
487 {
488 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
489 }
490
bpf_obj_memzero(struct btf_record * rec,void * dst,u32 size)491 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
492 {
493 u32 curr_off = 0;
494 int i;
495
496 if (IS_ERR_OR_NULL(rec)) {
497 memset(dst, 0, size);
498 return;
499 }
500
501 for (i = 0; i < rec->cnt; i++) {
502 u32 next_off = rec->fields[i].offset;
503 u32 sz = next_off - curr_off;
504
505 memset(dst + curr_off, 0, sz);
506 curr_off += rec->fields[i].size + sz;
507 }
508 memset(dst + curr_off, 0, size - curr_off);
509 }
510
zero_map_value(struct bpf_map * map,void * dst)511 static inline void zero_map_value(struct bpf_map *map, void *dst)
512 {
513 bpf_obj_memzero(map->record, dst, map->value_size);
514 }
515
516 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
517 bool lock_src);
518 void bpf_timer_cancel_and_free(void *timer);
519 void bpf_list_head_free(const struct btf_field *field, void *list_head,
520 struct bpf_spin_lock *spin_lock);
521 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
522 struct bpf_spin_lock *spin_lock);
523
524
525 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
526
527 struct bpf_offload_dev;
528 struct bpf_offloaded_map;
529
530 struct bpf_map_dev_ops {
531 int (*map_get_next_key)(struct bpf_offloaded_map *map,
532 void *key, void *next_key);
533 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
534 void *key, void *value);
535 int (*map_update_elem)(struct bpf_offloaded_map *map,
536 void *key, void *value, u64 flags);
537 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
538 };
539
540 struct bpf_offloaded_map {
541 struct bpf_map map;
542 struct net_device *netdev;
543 const struct bpf_map_dev_ops *dev_ops;
544 void *dev_priv;
545 struct list_head offloads;
546 };
547
map_to_offmap(struct bpf_map * map)548 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
549 {
550 return container_of(map, struct bpf_offloaded_map, map);
551 }
552
bpf_map_offload_neutral(const struct bpf_map * map)553 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
554 {
555 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
556 }
557
bpf_map_support_seq_show(const struct bpf_map * map)558 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
559 {
560 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
561 map->ops->map_seq_show_elem;
562 }
563
564 int map_check_no_btf(const struct bpf_map *map,
565 const struct btf *btf,
566 const struct btf_type *key_type,
567 const struct btf_type *value_type);
568
569 bool bpf_map_meta_equal(const struct bpf_map *meta0,
570 const struct bpf_map *meta1);
571
572 extern const struct bpf_map_ops bpf_map_offload_ops;
573
574 /* bpf_type_flag contains a set of flags that are applicable to the values of
575 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
576 * or a memory is read-only. We classify types into two categories: base types
577 * and extended types. Extended types are base types combined with a type flag.
578 *
579 * Currently there are no more than 32 base types in arg_type, ret_type and
580 * reg_types.
581 */
582 #define BPF_BASE_TYPE_BITS 8
583
584 enum bpf_type_flag {
585 /* PTR may be NULL. */
586 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
587
588 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
589 * compatible with both mutable and immutable memory.
590 */
591 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
592
593 /* MEM points to BPF ring buffer reservation. */
594 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
595
596 /* MEM is in user address space. */
597 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
598
599 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
600 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
601 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
602 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
603 * to the specified cpu.
604 */
605 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
606
607 /* Indicates that the argument will be released. */
608 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
609
610 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
611 * unreferenced and referenced kptr loaded from map value using a load
612 * instruction, so that they can only be dereferenced but not escape the
613 * BPF program into the kernel (i.e. cannot be passed as arguments to
614 * kfunc or bpf helpers).
615 */
616 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
617
618 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
619
620 /* DYNPTR points to memory local to the bpf program. */
621 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
622
623 /* DYNPTR points to a kernel-produced ringbuf record. */
624 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
625
626 /* Size is known at compile time. */
627 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
628
629 /* MEM is of an allocated object of type in program BTF. This is used to
630 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
631 */
632 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
633
634 /* PTR was passed from the kernel in a trusted context, and may be
635 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
636 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
637 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
638 * without invoking bpf_kptr_xchg(). What we really need to know is
639 * whether a pointer is safe to pass to a kfunc or BPF helper function.
640 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
641 * helpers, they do not cover all possible instances of unsafe
642 * pointers. For example, a pointer that was obtained from walking a
643 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
644 * fact that it may be NULL, invalid, etc. This is due to backwards
645 * compatibility requirements, as this was the behavior that was first
646 * introduced when kptrs were added. The behavior is now considered
647 * deprecated, and PTR_UNTRUSTED will eventually be removed.
648 *
649 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
650 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
651 * For example, pointers passed to tracepoint arguments are considered
652 * PTR_TRUSTED, as are pointers that are passed to struct_ops
653 * callbacks. As alluded to above, pointers that are obtained from
654 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
655 * struct task_struct *task is PTR_TRUSTED, then accessing
656 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
657 * in a BPF register. Similarly, pointers passed to certain programs
658 * types such as kretprobes are not guaranteed to be valid, as they may
659 * for example contain an object that was recently freed.
660 */
661 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
662
663 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
664 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
665
666 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
667 * Currently only valid for linked-list and rbtree nodes. If the nodes
668 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
669 */
670 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
671
672 /* DYNPTR points to sk_buff */
673 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
674
675 /* DYNPTR points to xdp_buff */
676 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
677
678 __BPF_TYPE_FLAG_MAX,
679 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
680 };
681
682 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
683 | DYNPTR_TYPE_XDP)
684
685 /* Max number of base types. */
686 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
687
688 /* Max number of all types. */
689 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
690
691 /* function argument constraints */
692 enum bpf_arg_type {
693 ARG_DONTCARE = 0, /* unused argument in helper function */
694
695 /* the following constraints used to prototype
696 * bpf_map_lookup/update/delete_elem() functions
697 */
698 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
699 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
700 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
701
702 /* Used to prototype bpf_memcmp() and other functions that access data
703 * on eBPF program stack
704 */
705 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
706
707 ARG_CONST_SIZE, /* number of bytes accessed from memory */
708 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
709
710 ARG_PTR_TO_CTX, /* pointer to context */
711 ARG_ANYTHING, /* any (initialized) argument is ok */
712 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
713 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
714 ARG_PTR_TO_INT, /* pointer to int */
715 ARG_PTR_TO_LONG, /* pointer to long */
716 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
717 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
718 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
719 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
720 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
721 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
722 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
723 ARG_PTR_TO_STACK, /* pointer to stack */
724 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
725 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
726 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */
727 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
728 __BPF_ARG_TYPE_MAX,
729
730 /* Extended arg_types. */
731 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
732 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
733 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
734 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
735 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
736 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
737 /* pointer to memory does not need to be initialized, helper function must fill
738 * all bytes or clear them in error case.
739 */
740 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM,
741 /* Pointer to valid memory of size known at compile time. */
742 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
743
744 /* This must be the last entry. Its purpose is to ensure the enum is
745 * wide enough to hold the higher bits reserved for bpf_type_flag.
746 */
747 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
748 };
749 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
750
751 /* type of values returned from helper functions */
752 enum bpf_return_type {
753 RET_INTEGER, /* function returns integer */
754 RET_VOID, /* function doesn't return anything */
755 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
756 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
757 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
758 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
759 RET_PTR_TO_MEM, /* returns a pointer to memory */
760 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
761 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
762 __BPF_RET_TYPE_MAX,
763
764 /* Extended ret_types. */
765 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
766 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
767 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
768 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
769 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
770 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
771 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
772 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
773
774 /* This must be the last entry. Its purpose is to ensure the enum is
775 * wide enough to hold the higher bits reserved for bpf_type_flag.
776 */
777 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
778 };
779 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
780
781 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
782 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
783 * instructions after verifying
784 */
785 struct bpf_func_proto {
786 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
787 bool gpl_only;
788 bool pkt_access;
789 bool might_sleep;
790 enum bpf_return_type ret_type;
791 union {
792 struct {
793 enum bpf_arg_type arg1_type;
794 enum bpf_arg_type arg2_type;
795 enum bpf_arg_type arg3_type;
796 enum bpf_arg_type arg4_type;
797 enum bpf_arg_type arg5_type;
798 };
799 enum bpf_arg_type arg_type[5];
800 };
801 union {
802 struct {
803 u32 *arg1_btf_id;
804 u32 *arg2_btf_id;
805 u32 *arg3_btf_id;
806 u32 *arg4_btf_id;
807 u32 *arg5_btf_id;
808 };
809 u32 *arg_btf_id[5];
810 struct {
811 size_t arg1_size;
812 size_t arg2_size;
813 size_t arg3_size;
814 size_t arg4_size;
815 size_t arg5_size;
816 };
817 size_t arg_size[5];
818 };
819 int *ret_btf_id; /* return value btf_id */
820 bool (*allowed)(const struct bpf_prog *prog);
821 };
822
823 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
824 * the first argument to eBPF programs.
825 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
826 */
827 struct bpf_context;
828
829 enum bpf_access_type {
830 BPF_READ = 1,
831 BPF_WRITE = 2
832 };
833
834 /* types of values stored in eBPF registers */
835 /* Pointer types represent:
836 * pointer
837 * pointer + imm
838 * pointer + (u16) var
839 * pointer + (u16) var + imm
840 * if (range > 0) then [ptr, ptr + range - off) is safe to access
841 * if (id > 0) means that some 'var' was added
842 * if (off > 0) means that 'imm' was added
843 */
844 enum bpf_reg_type {
845 NOT_INIT = 0, /* nothing was written into register */
846 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
847 PTR_TO_CTX, /* reg points to bpf_context */
848 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
849 PTR_TO_MAP_VALUE, /* reg points to map element value */
850 PTR_TO_MAP_KEY, /* reg points to a map element key */
851 PTR_TO_STACK, /* reg == frame_pointer + offset */
852 PTR_TO_PACKET_META, /* skb->data - meta_len */
853 PTR_TO_PACKET, /* reg points to skb->data */
854 PTR_TO_PACKET_END, /* skb->data + headlen */
855 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
856 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
857 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
858 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
859 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
860 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
861 /* PTR_TO_BTF_ID points to a kernel struct that does not need
862 * to be null checked by the BPF program. This does not imply the
863 * pointer is _not_ null and in practice this can easily be a null
864 * pointer when reading pointer chains. The assumption is program
865 * context will handle null pointer dereference typically via fault
866 * handling. The verifier must keep this in mind and can make no
867 * assumptions about null or non-null when doing branch analysis.
868 * Further, when passed into helpers the helpers can not, without
869 * additional context, assume the value is non-null.
870 */
871 PTR_TO_BTF_ID,
872 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
873 * been checked for null. Used primarily to inform the verifier
874 * an explicit null check is required for this struct.
875 */
876 PTR_TO_MEM, /* reg points to valid memory region */
877 PTR_TO_BUF, /* reg points to a read/write buffer */
878 PTR_TO_FUNC, /* reg points to a bpf program function */
879 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
880 __BPF_REG_TYPE_MAX,
881
882 /* Extended reg_types. */
883 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
884 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
885 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
886 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
887 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
888
889 /* This must be the last entry. Its purpose is to ensure the enum is
890 * wide enough to hold the higher bits reserved for bpf_type_flag.
891 */
892 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
893 };
894 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
895
896 /* The information passed from prog-specific *_is_valid_access
897 * back to the verifier.
898 */
899 struct bpf_insn_access_aux {
900 enum bpf_reg_type reg_type;
901 union {
902 int ctx_field_size;
903 struct {
904 struct btf *btf;
905 u32 btf_id;
906 };
907 };
908 struct bpf_verifier_log *log; /* for verbose logs */
909 };
910
911 static inline void
bpf_ctx_record_field_size(struct bpf_insn_access_aux * aux,u32 size)912 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
913 {
914 aux->ctx_field_size = size;
915 }
916
bpf_is_ldimm64(const struct bpf_insn * insn)917 static bool bpf_is_ldimm64(const struct bpf_insn *insn)
918 {
919 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
920 }
921
bpf_pseudo_func(const struct bpf_insn * insn)922 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
923 {
924 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
925 }
926
927 struct bpf_prog_ops {
928 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
929 union bpf_attr __user *uattr);
930 };
931
932 struct bpf_reg_state;
933 struct bpf_verifier_ops {
934 /* return eBPF function prototype for verification */
935 const struct bpf_func_proto *
936 (*get_func_proto)(enum bpf_func_id func_id,
937 const struct bpf_prog *prog);
938
939 /* return true if 'size' wide access at offset 'off' within bpf_context
940 * with 'type' (read or write) is allowed
941 */
942 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
943 const struct bpf_prog *prog,
944 struct bpf_insn_access_aux *info);
945 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
946 const struct bpf_prog *prog);
947 int (*gen_ld_abs)(const struct bpf_insn *orig,
948 struct bpf_insn *insn_buf);
949 u32 (*convert_ctx_access)(enum bpf_access_type type,
950 const struct bpf_insn *src,
951 struct bpf_insn *dst,
952 struct bpf_prog *prog, u32 *target_size);
953 int (*btf_struct_access)(struct bpf_verifier_log *log,
954 const struct bpf_reg_state *reg,
955 int off, int size);
956 };
957
958 struct bpf_prog_offload_ops {
959 /* verifier basic callbacks */
960 int (*insn_hook)(struct bpf_verifier_env *env,
961 int insn_idx, int prev_insn_idx);
962 int (*finalize)(struct bpf_verifier_env *env);
963 /* verifier optimization callbacks (called after .finalize) */
964 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
965 struct bpf_insn *insn);
966 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
967 /* program management callbacks */
968 int (*prepare)(struct bpf_prog *prog);
969 int (*translate)(struct bpf_prog *prog);
970 void (*destroy)(struct bpf_prog *prog);
971 };
972
973 struct bpf_prog_offload {
974 struct bpf_prog *prog;
975 struct net_device *netdev;
976 struct bpf_offload_dev *offdev;
977 void *dev_priv;
978 struct list_head offloads;
979 bool dev_state;
980 bool opt_failed;
981 void *jited_image;
982 u32 jited_len;
983 };
984
985 enum bpf_cgroup_storage_type {
986 BPF_CGROUP_STORAGE_SHARED,
987 BPF_CGROUP_STORAGE_PERCPU,
988 __BPF_CGROUP_STORAGE_MAX
989 };
990
991 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
992
993 /* The longest tracepoint has 12 args.
994 * See include/trace/bpf_probe.h
995 */
996 #define MAX_BPF_FUNC_ARGS 12
997
998 /* The maximum number of arguments passed through registers
999 * a single function may have.
1000 */
1001 #define MAX_BPF_FUNC_REG_ARGS 5
1002
1003 /* The argument is a structure. */
1004 #define BTF_FMODEL_STRUCT_ARG BIT(0)
1005
1006 /* The argument is signed. */
1007 #define BTF_FMODEL_SIGNED_ARG BIT(1)
1008
1009 struct btf_func_model {
1010 u8 ret_size;
1011 u8 ret_flags;
1012 u8 nr_args;
1013 u8 arg_size[MAX_BPF_FUNC_ARGS];
1014 u8 arg_flags[MAX_BPF_FUNC_ARGS];
1015 };
1016
1017 /* Restore arguments before returning from trampoline to let original function
1018 * continue executing. This flag is used for fentry progs when there are no
1019 * fexit progs.
1020 */
1021 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1022 /* Call original function after fentry progs, but before fexit progs.
1023 * Makes sense for fentry/fexit, normal calls and indirect calls.
1024 */
1025 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
1026 /* Skip current frame and return to parent. Makes sense for fentry/fexit
1027 * programs only. Should not be used with normal calls and indirect calls.
1028 */
1029 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1030 /* Store IP address of the caller on the trampoline stack,
1031 * so it's available for trampoline's programs.
1032 */
1033 #define BPF_TRAMP_F_IP_ARG BIT(3)
1034 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1035 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1036
1037 /* Get original function from stack instead of from provided direct address.
1038 * Makes sense for trampolines with fexit or fmod_ret programs.
1039 */
1040 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
1041
1042 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1043 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1044 */
1045 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1046
1047 /* Indicate that current trampoline is in a tail call context. Then, it has to
1048 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1049 */
1050 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1051
1052 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1053 * bytes on x86.
1054 */
1055 enum {
1056 #if defined(__s390x__)
1057 BPF_MAX_TRAMP_LINKS = 27,
1058 #else
1059 BPF_MAX_TRAMP_LINKS = 38,
1060 #endif
1061 };
1062
1063 struct bpf_tramp_links {
1064 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1065 int nr_links;
1066 };
1067
1068 struct bpf_tramp_run_ctx;
1069
1070 /* Different use cases for BPF trampoline:
1071 * 1. replace nop at the function entry (kprobe equivalent)
1072 * flags = BPF_TRAMP_F_RESTORE_REGS
1073 * fentry = a set of programs to run before returning from trampoline
1074 *
1075 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1076 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1077 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1078 * fentry = a set of program to run before calling original function
1079 * fexit = a set of program to run after original function
1080 *
1081 * 3. replace direct call instruction anywhere in the function body
1082 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1083 * With flags = 0
1084 * fentry = a set of programs to run before returning from trampoline
1085 * With flags = BPF_TRAMP_F_CALL_ORIG
1086 * orig_call = original callback addr or direct function addr
1087 * fentry = a set of program to run before calling original function
1088 * fexit = a set of program to run after original function
1089 */
1090 struct bpf_tramp_image;
1091 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
1092 const struct btf_func_model *m, u32 flags,
1093 struct bpf_tramp_links *tlinks,
1094 void *orig_call);
1095 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1096 struct bpf_tramp_run_ctx *run_ctx);
1097 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1098 struct bpf_tramp_run_ctx *run_ctx);
1099 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1100 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1101 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1102 struct bpf_tramp_run_ctx *run_ctx);
1103 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1104 struct bpf_tramp_run_ctx *run_ctx);
1105 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1106 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1107
1108 struct bpf_ksym {
1109 unsigned long start;
1110 unsigned long end;
1111 char name[KSYM_NAME_LEN];
1112 struct list_head lnode;
1113 struct latch_tree_node tnode;
1114 bool prog;
1115 };
1116
1117 enum bpf_tramp_prog_type {
1118 BPF_TRAMP_FENTRY,
1119 BPF_TRAMP_FEXIT,
1120 BPF_TRAMP_MODIFY_RETURN,
1121 BPF_TRAMP_MAX,
1122 BPF_TRAMP_REPLACE, /* more than MAX */
1123 };
1124
1125 struct bpf_tramp_image {
1126 void *image;
1127 struct bpf_ksym ksym;
1128 struct percpu_ref pcref;
1129 void *ip_after_call;
1130 void *ip_epilogue;
1131 union {
1132 struct rcu_head rcu;
1133 struct work_struct work;
1134 };
1135 };
1136
1137 struct bpf_trampoline {
1138 /* hlist for trampoline_table */
1139 struct hlist_node hlist;
1140 struct ftrace_ops *fops;
1141 /* serializes access to fields of this trampoline */
1142 struct mutex mutex;
1143 refcount_t refcnt;
1144 u32 flags;
1145 u64 key;
1146 struct {
1147 struct btf_func_model model;
1148 void *addr;
1149 bool ftrace_managed;
1150 } func;
1151 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1152 * program by replacing one of its functions. func.addr is the address
1153 * of the function it replaced.
1154 */
1155 struct bpf_prog *extension_prog;
1156 /* list of BPF programs using this trampoline */
1157 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1158 /* Number of attached programs. A counter per kind. */
1159 int progs_cnt[BPF_TRAMP_MAX];
1160 /* Executable image of trampoline */
1161 struct bpf_tramp_image *cur_image;
1162 struct module *mod;
1163 };
1164
1165 struct bpf_attach_target_info {
1166 struct btf_func_model fmodel;
1167 long tgt_addr;
1168 struct module *tgt_mod;
1169 const char *tgt_name;
1170 const struct btf_type *tgt_type;
1171 };
1172
1173 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1174
1175 struct bpf_dispatcher_prog {
1176 struct bpf_prog *prog;
1177 refcount_t users;
1178 };
1179
1180 struct bpf_dispatcher {
1181 /* dispatcher mutex */
1182 struct mutex mutex;
1183 void *func;
1184 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1185 int num_progs;
1186 void *image;
1187 void *rw_image;
1188 u32 image_off;
1189 struct bpf_ksym ksym;
1190 #ifdef CONFIG_HAVE_STATIC_CALL
1191 struct static_call_key *sc_key;
1192 void *sc_tramp;
1193 #endif
1194 };
1195
bpf_dispatcher_nop_func(const void * ctx,const struct bpf_insn * insnsi,bpf_func_t bpf_func)1196 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
1197 const void *ctx,
1198 const struct bpf_insn *insnsi,
1199 bpf_func_t bpf_func)
1200 {
1201 return bpf_func(ctx, insnsi);
1202 }
1203
1204 /* the implementation of the opaque uapi struct bpf_dynptr */
1205 struct bpf_dynptr_kern {
1206 void *data;
1207 /* Size represents the number of usable bytes of dynptr data.
1208 * If for example the offset is at 4 for a local dynptr whose data is
1209 * of type u64, the number of usable bytes is 4.
1210 *
1211 * The upper 8 bits are reserved. It is as follows:
1212 * Bits 0 - 23 = size
1213 * Bits 24 - 30 = dynptr type
1214 * Bit 31 = whether dynptr is read-only
1215 */
1216 u32 size;
1217 u32 offset;
1218 } __aligned(8);
1219
1220 enum bpf_dynptr_type {
1221 BPF_DYNPTR_TYPE_INVALID,
1222 /* Points to memory that is local to the bpf program */
1223 BPF_DYNPTR_TYPE_LOCAL,
1224 /* Underlying data is a ringbuf record */
1225 BPF_DYNPTR_TYPE_RINGBUF,
1226 /* Underlying data is a sk_buff */
1227 BPF_DYNPTR_TYPE_SKB,
1228 /* Underlying data is a xdp_buff */
1229 BPF_DYNPTR_TYPE_XDP,
1230 };
1231
1232 int bpf_dynptr_check_size(u32 size);
1233 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1234
1235 #ifdef CONFIG_BPF_JIT
1236 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1237 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1238 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1239 struct bpf_attach_target_info *tgt_info);
1240 void bpf_trampoline_put(struct bpf_trampoline *tr);
1241 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1242
1243 /*
1244 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1245 * indirection with a direct call to the bpf program. If the architecture does
1246 * not have STATIC_CALL, avoid a double-indirection.
1247 */
1248 #ifdef CONFIG_HAVE_STATIC_CALL
1249
1250 #define __BPF_DISPATCHER_SC_INIT(_name) \
1251 .sc_key = &STATIC_CALL_KEY(_name), \
1252 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1253
1254 #define __BPF_DISPATCHER_SC(name) \
1255 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1256
1257 #define __BPF_DISPATCHER_CALL(name) \
1258 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1259
1260 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1261 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1262
1263 #else
1264 #define __BPF_DISPATCHER_SC_INIT(name)
1265 #define __BPF_DISPATCHER_SC(name)
1266 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1267 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1268 #endif
1269
1270 #define BPF_DISPATCHER_INIT(_name) { \
1271 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1272 .func = &_name##_func, \
1273 .progs = {}, \
1274 .num_progs = 0, \
1275 .image = NULL, \
1276 .image_off = 0, \
1277 .ksym = { \
1278 .name = #_name, \
1279 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1280 }, \
1281 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1282 }
1283
1284 #define DEFINE_BPF_DISPATCHER(name) \
1285 __BPF_DISPATCHER_SC(name); \
1286 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
1287 const void *ctx, \
1288 const struct bpf_insn *insnsi, \
1289 bpf_func_t bpf_func) \
1290 { \
1291 return __BPF_DISPATCHER_CALL(name); \
1292 } \
1293 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1294 struct bpf_dispatcher bpf_dispatcher_##name = \
1295 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1296
1297 #define DECLARE_BPF_DISPATCHER(name) \
1298 unsigned int bpf_dispatcher_##name##_func( \
1299 const void *ctx, \
1300 const struct bpf_insn *insnsi, \
1301 bpf_func_t bpf_func); \
1302 extern struct bpf_dispatcher bpf_dispatcher_##name;
1303
1304 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1305 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1306 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1307 struct bpf_prog *to);
1308 /* Called only from JIT-enabled code, so there's no need for stubs. */
1309 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
1310 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1311 void bpf_ksym_add(struct bpf_ksym *ksym);
1312 void bpf_ksym_del(struct bpf_ksym *ksym);
1313 int bpf_jit_charge_modmem(u32 size);
1314 void bpf_jit_uncharge_modmem(u32 size);
1315 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1316 #else
bpf_trampoline_link_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1317 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1318 struct bpf_trampoline *tr)
1319 {
1320 return -ENOTSUPP;
1321 }
bpf_trampoline_unlink_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1322 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1323 struct bpf_trampoline *tr)
1324 {
1325 return -ENOTSUPP;
1326 }
bpf_trampoline_get(u64 key,struct bpf_attach_target_info * tgt_info)1327 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1328 struct bpf_attach_target_info *tgt_info)
1329 {
1330 return NULL;
1331 }
bpf_trampoline_put(struct bpf_trampoline * tr)1332 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1333 #define DEFINE_BPF_DISPATCHER(name)
1334 #define DECLARE_BPF_DISPATCHER(name)
1335 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1336 #define BPF_DISPATCHER_PTR(name) NULL
bpf_dispatcher_change_prog(struct bpf_dispatcher * d,struct bpf_prog * from,struct bpf_prog * to)1337 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1338 struct bpf_prog *from,
1339 struct bpf_prog *to) {}
is_bpf_image_address(unsigned long address)1340 static inline bool is_bpf_image_address(unsigned long address)
1341 {
1342 return false;
1343 }
bpf_prog_has_trampoline(const struct bpf_prog * prog)1344 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1345 {
1346 return false;
1347 }
1348 #endif
1349
1350 struct bpf_func_info_aux {
1351 u16 linkage;
1352 bool unreliable;
1353 };
1354
1355 enum bpf_jit_poke_reason {
1356 BPF_POKE_REASON_TAIL_CALL,
1357 };
1358
1359 /* Descriptor of pokes pointing /into/ the JITed image. */
1360 struct bpf_jit_poke_descriptor {
1361 void *tailcall_target;
1362 void *tailcall_bypass;
1363 void *bypass_addr;
1364 void *aux;
1365 union {
1366 struct {
1367 struct bpf_map *map;
1368 u32 key;
1369 } tail_call;
1370 };
1371 bool tailcall_target_stable;
1372 u8 adj_off;
1373 u16 reason;
1374 u32 insn_idx;
1375 };
1376
1377 /* reg_type info for ctx arguments */
1378 struct bpf_ctx_arg_aux {
1379 u32 offset;
1380 enum bpf_reg_type reg_type;
1381 u32 btf_id;
1382 };
1383
1384 struct btf_mod_pair {
1385 struct btf *btf;
1386 struct module *module;
1387 };
1388
1389 struct bpf_kfunc_desc_tab;
1390
1391 struct bpf_prog_aux {
1392 atomic64_t refcnt;
1393 u32 used_map_cnt;
1394 u32 used_btf_cnt;
1395 u32 max_ctx_offset;
1396 u32 max_pkt_offset;
1397 u32 max_tp_access;
1398 u32 stack_depth;
1399 u32 id;
1400 u32 func_cnt; /* used by non-func prog as the number of func progs */
1401 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1402 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1403 u32 ctx_arg_info_size;
1404 u32 max_rdonly_access;
1405 u32 max_rdwr_access;
1406 struct btf *attach_btf;
1407 const struct bpf_ctx_arg_aux *ctx_arg_info;
1408 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1409 struct bpf_prog *dst_prog;
1410 struct bpf_trampoline *dst_trampoline;
1411 enum bpf_prog_type saved_dst_prog_type;
1412 enum bpf_attach_type saved_dst_attach_type;
1413 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1414 bool dev_bound; /* Program is bound to the netdev. */
1415 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1416 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1417 bool func_proto_unreliable;
1418 bool sleepable;
1419 bool tail_call_reachable;
1420 bool xdp_has_frags;
1421 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1422 const struct btf_type *attach_func_proto;
1423 /* function name for valid attach_btf_id */
1424 const char *attach_func_name;
1425 struct bpf_prog **func;
1426 void *jit_data; /* JIT specific data. arch dependent */
1427 struct bpf_jit_poke_descriptor *poke_tab;
1428 struct bpf_kfunc_desc_tab *kfunc_tab;
1429 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1430 u32 size_poke_tab;
1431 struct bpf_ksym ksym;
1432 const struct bpf_prog_ops *ops;
1433 struct bpf_map **used_maps;
1434 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1435 struct btf_mod_pair *used_btfs;
1436 struct bpf_prog *prog;
1437 struct user_struct *user;
1438 u64 load_time; /* ns since boottime */
1439 u32 verified_insns;
1440 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1441 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1442 char name[BPF_OBJ_NAME_LEN];
1443 #ifdef CONFIG_SECURITY
1444 void *security;
1445 #endif
1446 struct bpf_prog_offload *offload;
1447 struct btf *btf;
1448 struct bpf_func_info *func_info;
1449 struct bpf_func_info_aux *func_info_aux;
1450 /* bpf_line_info loaded from userspace. linfo->insn_off
1451 * has the xlated insn offset.
1452 * Both the main and sub prog share the same linfo.
1453 * The subprog can access its first linfo by
1454 * using the linfo_idx.
1455 */
1456 struct bpf_line_info *linfo;
1457 /* jited_linfo is the jited addr of the linfo. It has a
1458 * one to one mapping to linfo:
1459 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1460 * Both the main and sub prog share the same jited_linfo.
1461 * The subprog can access its first jited_linfo by
1462 * using the linfo_idx.
1463 */
1464 void **jited_linfo;
1465 u32 func_info_cnt;
1466 u32 nr_linfo;
1467 /* subprog can use linfo_idx to access its first linfo and
1468 * jited_linfo.
1469 * main prog always has linfo_idx == 0
1470 */
1471 u32 linfo_idx;
1472 struct module *mod;
1473 u32 num_exentries;
1474 struct exception_table_entry *extable;
1475 union {
1476 struct work_struct work;
1477 struct rcu_head rcu;
1478 };
1479 };
1480
1481 struct bpf_prog {
1482 u16 pages; /* Number of allocated pages */
1483 u16 jited:1, /* Is our filter JIT'ed? */
1484 jit_requested:1,/* archs need to JIT the prog */
1485 gpl_compatible:1, /* Is filter GPL compatible? */
1486 cb_access:1, /* Is control block accessed? */
1487 dst_needed:1, /* Do we need dst entry? */
1488 blinding_requested:1, /* needs constant blinding */
1489 blinded:1, /* Was blinded */
1490 is_func:1, /* program is a bpf function */
1491 kprobe_override:1, /* Do we override a kprobe? */
1492 has_callchain_buf:1, /* callchain buffer allocated? */
1493 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1494 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1495 call_get_func_ip:1, /* Do we call get_func_ip() */
1496 tstamp_type_access:1; /* Accessed __sk_buff->tstamp_type */
1497 enum bpf_prog_type type; /* Type of BPF program */
1498 enum bpf_attach_type expected_attach_type; /* For some prog types */
1499 u32 len; /* Number of filter blocks */
1500 u32 jited_len; /* Size of jited insns in bytes */
1501 u8 tag[BPF_TAG_SIZE];
1502 struct bpf_prog_stats __percpu *stats;
1503 int __percpu *active;
1504 unsigned int (*bpf_func)(const void *ctx,
1505 const struct bpf_insn *insn);
1506 struct bpf_prog_aux *aux; /* Auxiliary fields */
1507 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1508 /* Instructions for interpreter */
1509 union {
1510 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1511 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1512 };
1513 };
1514
1515 struct bpf_array_aux {
1516 /* Programs with direct jumps into programs part of this array. */
1517 struct list_head poke_progs;
1518 struct bpf_map *map;
1519 struct mutex poke_mutex;
1520 struct work_struct work;
1521 };
1522
1523 struct bpf_link {
1524 atomic64_t refcnt;
1525 u32 id;
1526 enum bpf_link_type type;
1527 const struct bpf_link_ops *ops;
1528 struct bpf_prog *prog;
1529 /* rcu is used before freeing, work can be used to schedule that
1530 * RCU-based freeing before that, so they never overlap
1531 */
1532 union {
1533 struct rcu_head rcu;
1534 struct work_struct work;
1535 };
1536 };
1537
1538 struct bpf_link_ops {
1539 void (*release)(struct bpf_link *link);
1540 /* deallocate link resources callback, called without RCU grace period
1541 * waiting
1542 */
1543 void (*dealloc)(struct bpf_link *link);
1544 /* deallocate link resources callback, called after RCU grace period;
1545 * if underlying BPF program is sleepable we go through tasks trace
1546 * RCU GP and then "classic" RCU GP
1547 */
1548 void (*dealloc_deferred)(struct bpf_link *link);
1549 int (*detach)(struct bpf_link *link);
1550 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1551 struct bpf_prog *old_prog);
1552 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1553 int (*fill_link_info)(const struct bpf_link *link,
1554 struct bpf_link_info *info);
1555 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1556 struct bpf_map *old_map);
1557 };
1558
1559 struct bpf_tramp_link {
1560 struct bpf_link link;
1561 struct hlist_node tramp_hlist;
1562 u64 cookie;
1563 };
1564
1565 struct bpf_shim_tramp_link {
1566 struct bpf_tramp_link link;
1567 struct bpf_trampoline *trampoline;
1568 };
1569
1570 struct bpf_tracing_link {
1571 struct bpf_tramp_link link;
1572 enum bpf_attach_type attach_type;
1573 struct bpf_trampoline *trampoline;
1574 struct bpf_prog *tgt_prog;
1575 };
1576
1577 struct bpf_link_primer {
1578 struct bpf_link *link;
1579 struct file *file;
1580 int fd;
1581 u32 id;
1582 };
1583
1584 struct bpf_struct_ops_value;
1585 struct btf_member;
1586
1587 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1588 /**
1589 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1590 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1591 * of BPF_PROG_TYPE_STRUCT_OPS progs.
1592 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1593 * when determining whether the struct_ops progs in the
1594 * struct_ops map are valid.
1595 * @init: A callback that is invoked a single time, and before any other
1596 * callback, to initialize the structure. A nonzero return value means
1597 * the subsystem could not be initialized.
1598 * @check_member: When defined, a callback invoked by the verifier to allow
1599 * the subsystem to determine if an entry in the struct_ops map
1600 * is valid. A nonzero return value means that the map is
1601 * invalid and should be rejected by the verifier.
1602 * @init_member: A callback that is invoked for each member of the struct_ops
1603 * map to allow the subsystem to initialize the member. A nonzero
1604 * value means the member could not be initialized. This callback
1605 * is exclusive with the @type, @type_id, @value_type, and
1606 * @value_id fields.
1607 * @reg: A callback that is invoked when the struct_ops map has been
1608 * initialized and is being attached to. Zero means the struct_ops map
1609 * has been successfully registered and is live. A nonzero return value
1610 * means the struct_ops map could not be registered.
1611 * @unreg: A callback that is invoked when the struct_ops map should be
1612 * unregistered.
1613 * @update: A callback that is invoked when the live struct_ops map is being
1614 * updated to contain new values. This callback is only invoked when
1615 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1616 * it is assumed that the struct_ops map cannot be updated.
1617 * @validate: A callback that is invoked after all of the members have been
1618 * initialized. This callback should perform static checks on the
1619 * map, meaning that it should either fail or succeed
1620 * deterministically. A struct_ops map that has been validated may
1621 * not necessarily succeed in being registered if the call to @reg
1622 * fails. For example, a valid struct_ops map may be loaded, but
1623 * then fail to be registered due to there being another active
1624 * struct_ops map on the system in the subsystem already. For this
1625 * reason, if this callback is not defined, the check is skipped as
1626 * the struct_ops map will have final verification performed in
1627 * @reg.
1628 * @type: BTF type.
1629 * @value_type: Value type.
1630 * @name: The name of the struct bpf_struct_ops object.
1631 * @func_models: Func models
1632 * @type_id: BTF type id.
1633 * @value_id: BTF value id.
1634 */
1635 struct bpf_struct_ops {
1636 const struct bpf_verifier_ops *verifier_ops;
1637 int (*init)(struct btf *btf);
1638 int (*check_member)(const struct btf_type *t,
1639 const struct btf_member *member,
1640 const struct bpf_prog *prog);
1641 int (*init_member)(const struct btf_type *t,
1642 const struct btf_member *member,
1643 void *kdata, const void *udata);
1644 int (*reg)(void *kdata);
1645 void (*unreg)(void *kdata);
1646 int (*update)(void *kdata, void *old_kdata);
1647 int (*validate)(void *kdata);
1648 const struct btf_type *type;
1649 const struct btf_type *value_type;
1650 const char *name;
1651 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1652 u32 type_id;
1653 u32 value_id;
1654 };
1655
1656 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1657 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1658 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1659 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1660 bool bpf_struct_ops_get(const void *kdata);
1661 void bpf_struct_ops_put(const void *kdata);
1662 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1663 void *value);
1664 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1665 struct bpf_tramp_link *link,
1666 const struct btf_func_model *model,
1667 void *image, void *image_end);
bpf_try_module_get(const void * data,struct module * owner)1668 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1669 {
1670 if (owner == BPF_MODULE_OWNER)
1671 return bpf_struct_ops_get(data);
1672 else
1673 return try_module_get(owner);
1674 }
bpf_module_put(const void * data,struct module * owner)1675 static inline void bpf_module_put(const void *data, struct module *owner)
1676 {
1677 if (owner == BPF_MODULE_OWNER)
1678 bpf_struct_ops_put(data);
1679 else
1680 module_put(owner);
1681 }
1682 int bpf_struct_ops_link_create(union bpf_attr *attr);
1683
1684 #ifdef CONFIG_NET
1685 /* Define it here to avoid the use of forward declaration */
1686 struct bpf_dummy_ops_state {
1687 int val;
1688 };
1689
1690 struct bpf_dummy_ops {
1691 int (*test_1)(struct bpf_dummy_ops_state *cb);
1692 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1693 char a3, unsigned long a4);
1694 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1695 };
1696
1697 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1698 union bpf_attr __user *uattr);
1699 #endif
1700 #else
bpf_struct_ops_find(u32 type_id)1701 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1702 {
1703 return NULL;
1704 }
bpf_struct_ops_init(struct btf * btf,struct bpf_verifier_log * log)1705 static inline void bpf_struct_ops_init(struct btf *btf,
1706 struct bpf_verifier_log *log)
1707 {
1708 }
bpf_try_module_get(const void * data,struct module * owner)1709 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1710 {
1711 return try_module_get(owner);
1712 }
bpf_module_put(const void * data,struct module * owner)1713 static inline void bpf_module_put(const void *data, struct module *owner)
1714 {
1715 module_put(owner);
1716 }
bpf_struct_ops_map_sys_lookup_elem(struct bpf_map * map,void * key,void * value)1717 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1718 void *key,
1719 void *value)
1720 {
1721 return -EINVAL;
1722 }
bpf_struct_ops_link_create(union bpf_attr * attr)1723 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1724 {
1725 return -EOPNOTSUPP;
1726 }
1727
1728 #endif
1729
1730 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1731 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1732 int cgroup_atype);
1733 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1734 #else
bpf_trampoline_link_cgroup_shim(struct bpf_prog * prog,int cgroup_atype)1735 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1736 int cgroup_atype)
1737 {
1738 return -EOPNOTSUPP;
1739 }
bpf_trampoline_unlink_cgroup_shim(struct bpf_prog * prog)1740 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1741 {
1742 }
1743 #endif
1744
1745 struct bpf_array {
1746 struct bpf_map map;
1747 u32 elem_size;
1748 u32 index_mask;
1749 struct bpf_array_aux *aux;
1750 union {
1751 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1752 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1753 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1754 };
1755 };
1756
1757 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1758 #define MAX_TAIL_CALL_CNT 33
1759
1760 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1761 * It's enum to expose it (and thus make it discoverable) through BTF.
1762 */
1763 enum {
1764 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1765 };
1766
1767 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1768 BPF_F_RDONLY_PROG | \
1769 BPF_F_WRONLY | \
1770 BPF_F_WRONLY_PROG)
1771
1772 #define BPF_MAP_CAN_READ BIT(0)
1773 #define BPF_MAP_CAN_WRITE BIT(1)
1774
1775 /* Maximum number of user-producer ring buffer samples that can be drained in
1776 * a call to bpf_user_ringbuf_drain().
1777 */
1778 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1779
bpf_map_flags_to_cap(struct bpf_map * map)1780 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1781 {
1782 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1783
1784 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1785 * not possible.
1786 */
1787 if (access_flags & BPF_F_RDONLY_PROG)
1788 return BPF_MAP_CAN_READ;
1789 else if (access_flags & BPF_F_WRONLY_PROG)
1790 return BPF_MAP_CAN_WRITE;
1791 else
1792 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1793 }
1794
bpf_map_flags_access_ok(u32 access_flags)1795 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1796 {
1797 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1798 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1799 }
1800
1801 struct bpf_event_entry {
1802 struct perf_event *event;
1803 struct file *perf_file;
1804 struct file *map_file;
1805 struct rcu_head rcu;
1806 };
1807
map_type_contains_progs(struct bpf_map * map)1808 static inline bool map_type_contains_progs(struct bpf_map *map)
1809 {
1810 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1811 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1812 map->map_type == BPF_MAP_TYPE_CPUMAP;
1813 }
1814
1815 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1816 int bpf_prog_calc_tag(struct bpf_prog *fp);
1817
1818 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1819 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1820
1821 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1822 unsigned long off, unsigned long len);
1823 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1824 const struct bpf_insn *src,
1825 struct bpf_insn *dst,
1826 struct bpf_prog *prog,
1827 u32 *target_size);
1828
1829 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1830 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1831
1832 /* an array of programs to be executed under rcu_lock.
1833 *
1834 * Typical usage:
1835 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
1836 *
1837 * the structure returned by bpf_prog_array_alloc() should be populated
1838 * with program pointers and the last pointer must be NULL.
1839 * The user has to keep refcnt on the program and make sure the program
1840 * is removed from the array before bpf_prog_put().
1841 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1842 * since other cpus are walking the array of pointers in parallel.
1843 */
1844 struct bpf_prog_array_item {
1845 struct bpf_prog *prog;
1846 union {
1847 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1848 u64 bpf_cookie;
1849 };
1850 };
1851
1852 struct bpf_prog_array {
1853 struct rcu_head rcu;
1854 struct bpf_prog_array_item items[];
1855 };
1856
1857 struct bpf_empty_prog_array {
1858 struct bpf_prog_array hdr;
1859 struct bpf_prog *null_prog;
1860 };
1861
1862 /* to avoid allocating empty bpf_prog_array for cgroups that
1863 * don't have bpf program attached use one global 'bpf_empty_prog_array'
1864 * It will not be modified the caller of bpf_prog_array_alloc()
1865 * (since caller requested prog_cnt == 0)
1866 * that pointer should be 'freed' by bpf_prog_array_free()
1867 */
1868 extern struct bpf_empty_prog_array bpf_empty_prog_array;
1869
1870 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1871 void bpf_prog_array_free(struct bpf_prog_array *progs);
1872 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
1873 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
1874 int bpf_prog_array_length(struct bpf_prog_array *progs);
1875 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1876 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1877 __u32 __user *prog_ids, u32 cnt);
1878
1879 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1880 struct bpf_prog *old_prog);
1881 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1882 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1883 struct bpf_prog *prog);
1884 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1885 u32 *prog_ids, u32 request_cnt,
1886 u32 *prog_cnt);
1887 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1888 struct bpf_prog *exclude_prog,
1889 struct bpf_prog *include_prog,
1890 u64 bpf_cookie,
1891 struct bpf_prog_array **new_array);
1892
1893 struct bpf_run_ctx {};
1894
1895 struct bpf_cg_run_ctx {
1896 struct bpf_run_ctx run_ctx;
1897 const struct bpf_prog_array_item *prog_item;
1898 int retval;
1899 };
1900
1901 struct bpf_trace_run_ctx {
1902 struct bpf_run_ctx run_ctx;
1903 u64 bpf_cookie;
1904 bool is_uprobe;
1905 };
1906
1907 struct bpf_tramp_run_ctx {
1908 struct bpf_run_ctx run_ctx;
1909 u64 bpf_cookie;
1910 struct bpf_run_ctx *saved_run_ctx;
1911 };
1912
bpf_set_run_ctx(struct bpf_run_ctx * new_ctx)1913 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1914 {
1915 struct bpf_run_ctx *old_ctx = NULL;
1916
1917 #ifdef CONFIG_BPF_SYSCALL
1918 old_ctx = current->bpf_ctx;
1919 current->bpf_ctx = new_ctx;
1920 #endif
1921 return old_ctx;
1922 }
1923
bpf_reset_run_ctx(struct bpf_run_ctx * old_ctx)1924 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1925 {
1926 #ifdef CONFIG_BPF_SYSCALL
1927 current->bpf_ctx = old_ctx;
1928 #endif
1929 }
1930
1931 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1932 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1933 /* BPF program asks to set CN on the packet. */
1934 #define BPF_RET_SET_CN (1 << 0)
1935
1936 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1937
1938 static __always_inline u32
bpf_prog_run_array(const struct bpf_prog_array * array,const void * ctx,bpf_prog_run_fn run_prog)1939 bpf_prog_run_array(const struct bpf_prog_array *array,
1940 const void *ctx, bpf_prog_run_fn run_prog)
1941 {
1942 const struct bpf_prog_array_item *item;
1943 const struct bpf_prog *prog;
1944 struct bpf_run_ctx *old_run_ctx;
1945 struct bpf_trace_run_ctx run_ctx;
1946 u32 ret = 1;
1947
1948 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
1949
1950 if (unlikely(!array))
1951 return ret;
1952
1953 run_ctx.is_uprobe = false;
1954
1955 migrate_disable();
1956 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1957 item = &array->items[0];
1958 while ((prog = READ_ONCE(item->prog))) {
1959 run_ctx.bpf_cookie = item->bpf_cookie;
1960 ret &= run_prog(prog, ctx);
1961 item++;
1962 }
1963 bpf_reset_run_ctx(old_run_ctx);
1964 migrate_enable();
1965 return ret;
1966 }
1967
1968 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
1969 *
1970 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
1971 * overall. As a result, we must use the bpf_prog_array_free_sleepable
1972 * in order to use the tasks_trace rcu grace period.
1973 *
1974 * When a non-sleepable program is inside the array, we take the rcu read
1975 * section and disable preemption for that program alone, so it can access
1976 * rcu-protected dynamically sized maps.
1977 */
1978 static __always_inline u32
bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu * array_rcu,const void * ctx,bpf_prog_run_fn run_prog)1979 bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu *array_rcu,
1980 const void *ctx, bpf_prog_run_fn run_prog)
1981 {
1982 const struct bpf_prog_array_item *item;
1983 const struct bpf_prog *prog;
1984 const struct bpf_prog_array *array;
1985 struct bpf_run_ctx *old_run_ctx;
1986 struct bpf_trace_run_ctx run_ctx;
1987 u32 ret = 1;
1988
1989 might_fault();
1990
1991 rcu_read_lock_trace();
1992 migrate_disable();
1993
1994 run_ctx.is_uprobe = true;
1995
1996 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());
1997 if (unlikely(!array))
1998 goto out;
1999 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2000 item = &array->items[0];
2001 while ((prog = READ_ONCE(item->prog))) {
2002 if (!prog->aux->sleepable)
2003 rcu_read_lock();
2004
2005 run_ctx.bpf_cookie = item->bpf_cookie;
2006 ret &= run_prog(prog, ctx);
2007 item++;
2008
2009 if (!prog->aux->sleepable)
2010 rcu_read_unlock();
2011 }
2012 bpf_reset_run_ctx(old_run_ctx);
2013 out:
2014 migrate_enable();
2015 rcu_read_unlock_trace();
2016 return ret;
2017 }
2018
2019 #ifdef CONFIG_BPF_SYSCALL
2020 DECLARE_PER_CPU(int, bpf_prog_active);
2021 extern struct mutex bpf_stats_enabled_mutex;
2022
2023 /*
2024 * Block execution of BPF programs attached to instrumentation (perf,
2025 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2026 * these events can happen inside a region which holds a map bucket lock
2027 * and can deadlock on it.
2028 */
bpf_disable_instrumentation(void)2029 static inline void bpf_disable_instrumentation(void)
2030 {
2031 migrate_disable();
2032 this_cpu_inc(bpf_prog_active);
2033 }
2034
bpf_enable_instrumentation(void)2035 static inline void bpf_enable_instrumentation(void)
2036 {
2037 this_cpu_dec(bpf_prog_active);
2038 migrate_enable();
2039 }
2040
2041 extern const struct file_operations bpf_map_fops;
2042 extern const struct file_operations bpf_prog_fops;
2043 extern const struct file_operations bpf_iter_fops;
2044
2045 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2046 extern const struct bpf_prog_ops _name ## _prog_ops; \
2047 extern const struct bpf_verifier_ops _name ## _verifier_ops;
2048 #define BPF_MAP_TYPE(_id, _ops) \
2049 extern const struct bpf_map_ops _ops;
2050 #define BPF_LINK_TYPE(_id, _name)
2051 #include <linux/bpf_types.h>
2052 #undef BPF_PROG_TYPE
2053 #undef BPF_MAP_TYPE
2054 #undef BPF_LINK_TYPE
2055
2056 extern const struct bpf_prog_ops bpf_offload_prog_ops;
2057 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2058 extern const struct bpf_verifier_ops xdp_analyzer_ops;
2059
2060 struct bpf_prog *bpf_prog_get(u32 ufd);
2061 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2062 bool attach_drv);
2063 void bpf_prog_add(struct bpf_prog *prog, int i);
2064 void bpf_prog_sub(struct bpf_prog *prog, int i);
2065 void bpf_prog_inc(struct bpf_prog *prog);
2066 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2067 void bpf_prog_put(struct bpf_prog *prog);
2068
2069 void bpf_prog_free_id(struct bpf_prog *prog);
2070 void bpf_map_free_id(struct bpf_map *map);
2071
2072 struct btf_field *btf_record_find(const struct btf_record *rec,
2073 u32 offset, u32 field_mask);
2074 void btf_record_free(struct btf_record *rec);
2075 void bpf_map_free_record(struct bpf_map *map);
2076 struct btf_record *btf_record_dup(const struct btf_record *rec);
2077 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2078 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2079 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2080
2081 struct bpf_map *bpf_map_get(u32 ufd);
2082 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2083 struct bpf_map *__bpf_map_get(struct fd f);
2084 void bpf_map_inc(struct bpf_map *map);
2085 void bpf_map_inc_with_uref(struct bpf_map *map);
2086 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2087 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2088 void bpf_map_put_with_uref(struct bpf_map *map);
2089 void bpf_map_put(struct bpf_map *map);
2090 void *bpf_map_area_alloc(u64 size, int numa_node);
2091 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2092 void bpf_map_area_free(void *base);
2093 bool bpf_map_write_active(const struct bpf_map *map);
2094 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2095 int generic_map_lookup_batch(struct bpf_map *map,
2096 const union bpf_attr *attr,
2097 union bpf_attr __user *uattr);
2098 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2099 const union bpf_attr *attr,
2100 union bpf_attr __user *uattr);
2101 int generic_map_delete_batch(struct bpf_map *map,
2102 const union bpf_attr *attr,
2103 union bpf_attr __user *uattr);
2104 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2105 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2106
2107 #ifdef CONFIG_MEMCG_KMEM
2108 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2109 int node);
2110 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2111 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2112 gfp_t flags);
2113 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2114 size_t align, gfp_t flags);
2115 #else
2116 static inline void *
bpf_map_kmalloc_node(const struct bpf_map * map,size_t size,gfp_t flags,int node)2117 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2118 int node)
2119 {
2120 return kmalloc_node(size, flags, node);
2121 }
2122
2123 static inline void *
bpf_map_kzalloc(const struct bpf_map * map,size_t size,gfp_t flags)2124 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
2125 {
2126 return kzalloc(size, flags);
2127 }
2128
2129 static inline void *
bpf_map_kvcalloc(struct bpf_map * map,size_t n,size_t size,gfp_t flags)2130 bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
2131 {
2132 return kvcalloc(n, size, flags);
2133 }
2134
2135 static inline void __percpu *
bpf_map_alloc_percpu(const struct bpf_map * map,size_t size,size_t align,gfp_t flags)2136 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
2137 gfp_t flags)
2138 {
2139 return __alloc_percpu_gfp(size, align, flags);
2140 }
2141 #endif
2142
2143 static inline int
bpf_map_init_elem_count(struct bpf_map * map)2144 bpf_map_init_elem_count(struct bpf_map *map)
2145 {
2146 size_t size = sizeof(*map->elem_count), align = size;
2147 gfp_t flags = GFP_USER | __GFP_NOWARN;
2148
2149 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2150 if (!map->elem_count)
2151 return -ENOMEM;
2152
2153 return 0;
2154 }
2155
2156 static inline void
bpf_map_free_elem_count(struct bpf_map * map)2157 bpf_map_free_elem_count(struct bpf_map *map)
2158 {
2159 free_percpu(map->elem_count);
2160 }
2161
bpf_map_inc_elem_count(struct bpf_map * map)2162 static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2163 {
2164 this_cpu_inc(*map->elem_count);
2165 }
2166
bpf_map_dec_elem_count(struct bpf_map * map)2167 static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2168 {
2169 this_cpu_dec(*map->elem_count);
2170 }
2171
2172 extern int sysctl_unprivileged_bpf_disabled;
2173
bpf_allow_ptr_leaks(void)2174 static inline bool bpf_allow_ptr_leaks(void)
2175 {
2176 return perfmon_capable();
2177 }
2178
bpf_allow_uninit_stack(void)2179 static inline bool bpf_allow_uninit_stack(void)
2180 {
2181 return perfmon_capable();
2182 }
2183
bpf_bypass_spec_v1(void)2184 static inline bool bpf_bypass_spec_v1(void)
2185 {
2186 return perfmon_capable();
2187 }
2188
bpf_bypass_spec_v4(void)2189 static inline bool bpf_bypass_spec_v4(void)
2190 {
2191 return perfmon_capable();
2192 }
2193
2194 int bpf_map_new_fd(struct bpf_map *map, int flags);
2195 int bpf_prog_new_fd(struct bpf_prog *prog);
2196
2197 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2198 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2199 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2200 int bpf_link_settle(struct bpf_link_primer *primer);
2201 void bpf_link_cleanup(struct bpf_link_primer *primer);
2202 void bpf_link_inc(struct bpf_link *link);
2203 void bpf_link_put(struct bpf_link *link);
2204 int bpf_link_new_fd(struct bpf_link *link);
2205 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2206 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2207
2208 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2209 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2210
2211 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2212 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2213 extern int bpf_iter_ ## target(args); \
2214 int __init bpf_iter_ ## target(args) { return 0; }
2215
2216 /*
2217 * The task type of iterators.
2218 *
2219 * For BPF task iterators, they can be parameterized with various
2220 * parameters to visit only some of tasks.
2221 *
2222 * BPF_TASK_ITER_ALL (default)
2223 * Iterate over resources of every task.
2224 *
2225 * BPF_TASK_ITER_TID
2226 * Iterate over resources of a task/tid.
2227 *
2228 * BPF_TASK_ITER_TGID
2229 * Iterate over resources of every task of a process / task group.
2230 */
2231 enum bpf_iter_task_type {
2232 BPF_TASK_ITER_ALL = 0,
2233 BPF_TASK_ITER_TID,
2234 BPF_TASK_ITER_TGID,
2235 };
2236
2237 struct bpf_iter_aux_info {
2238 /* for map_elem iter */
2239 struct bpf_map *map;
2240
2241 /* for cgroup iter */
2242 struct {
2243 struct cgroup *start; /* starting cgroup */
2244 enum bpf_cgroup_iter_order order;
2245 } cgroup;
2246 struct {
2247 enum bpf_iter_task_type type;
2248 u32 pid;
2249 } task;
2250 };
2251
2252 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2253 union bpf_iter_link_info *linfo,
2254 struct bpf_iter_aux_info *aux);
2255 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2256 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2257 struct seq_file *seq);
2258 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2259 struct bpf_link_info *info);
2260 typedef const struct bpf_func_proto *
2261 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2262 const struct bpf_prog *prog);
2263
2264 enum bpf_iter_feature {
2265 BPF_ITER_RESCHED = BIT(0),
2266 };
2267
2268 #define BPF_ITER_CTX_ARG_MAX 2
2269 struct bpf_iter_reg {
2270 const char *target;
2271 bpf_iter_attach_target_t attach_target;
2272 bpf_iter_detach_target_t detach_target;
2273 bpf_iter_show_fdinfo_t show_fdinfo;
2274 bpf_iter_fill_link_info_t fill_link_info;
2275 bpf_iter_get_func_proto_t get_func_proto;
2276 u32 ctx_arg_info_size;
2277 u32 feature;
2278 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2279 const struct bpf_iter_seq_info *seq_info;
2280 };
2281
2282 struct bpf_iter_meta {
2283 __bpf_md_ptr(struct seq_file *, seq);
2284 u64 session_id;
2285 u64 seq_num;
2286 };
2287
2288 struct bpf_iter__bpf_map_elem {
2289 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2290 __bpf_md_ptr(struct bpf_map *, map);
2291 __bpf_md_ptr(void *, key);
2292 __bpf_md_ptr(void *, value);
2293 };
2294
2295 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2296 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2297 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2298 const struct bpf_func_proto *
2299 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2300 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2301 int bpf_iter_new_fd(struct bpf_link *link);
2302 bool bpf_link_is_iter(struct bpf_link *link);
2303 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2304 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2305 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2306 struct seq_file *seq);
2307 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2308 struct bpf_link_info *info);
2309
2310 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2311 struct bpf_func_state *caller,
2312 struct bpf_func_state *callee);
2313
2314 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2315 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2316 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2317 u64 flags);
2318 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2319 u64 flags);
2320
2321 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2322
2323 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2324 void *key, void *value, u64 map_flags);
2325 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2326 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2327 void *key, void *value, u64 map_flags);
2328 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2329
2330 int bpf_get_file_flag(int flags);
2331 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2332 size_t actual_size);
2333
2334 /* verify correctness of eBPF program */
2335 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2336
2337 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2338 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2339 #endif
2340
2341 struct btf *bpf_get_btf_vmlinux(void);
2342
2343 /* Map specifics */
2344 struct xdp_frame;
2345 struct sk_buff;
2346 struct bpf_dtab_netdev;
2347 struct bpf_cpu_map_entry;
2348
2349 void __dev_flush(void);
2350 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2351 struct net_device *dev_rx);
2352 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2353 struct net_device *dev_rx);
2354 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2355 struct bpf_map *map, bool exclude_ingress);
2356 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2357 struct bpf_prog *xdp_prog);
2358 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2359 struct bpf_prog *xdp_prog, struct bpf_map *map,
2360 bool exclude_ingress);
2361
2362 void __cpu_map_flush(void);
2363 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2364 struct net_device *dev_rx);
2365 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2366 struct sk_buff *skb);
2367
2368 /* Return map's numa specified by userspace */
bpf_map_attr_numa_node(const union bpf_attr * attr)2369 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2370 {
2371 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2372 attr->numa_node : NUMA_NO_NODE;
2373 }
2374
2375 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2376 int array_map_alloc_check(union bpf_attr *attr);
2377
2378 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2379 union bpf_attr __user *uattr);
2380 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2381 union bpf_attr __user *uattr);
2382 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2383 const union bpf_attr *kattr,
2384 union bpf_attr __user *uattr);
2385 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2386 const union bpf_attr *kattr,
2387 union bpf_attr __user *uattr);
2388 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2389 const union bpf_attr *kattr,
2390 union bpf_attr __user *uattr);
2391 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2392 const union bpf_attr *kattr,
2393 union bpf_attr __user *uattr);
2394 int bpf_prog_test_run_nf(struct bpf_prog *prog,
2395 const union bpf_attr *kattr,
2396 union bpf_attr __user *uattr);
2397 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2398 const struct bpf_prog *prog,
2399 struct bpf_insn_access_aux *info);
2400
bpf_tracing_ctx_access(int off,int size,enum bpf_access_type type)2401 static inline bool bpf_tracing_ctx_access(int off, int size,
2402 enum bpf_access_type type)
2403 {
2404 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2405 return false;
2406 if (type != BPF_READ)
2407 return false;
2408 if (off % size != 0)
2409 return false;
2410 return true;
2411 }
2412
bpf_tracing_btf_ctx_access(int off,int size,enum bpf_access_type type,const struct bpf_prog * prog,struct bpf_insn_access_aux * info)2413 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2414 enum bpf_access_type type,
2415 const struct bpf_prog *prog,
2416 struct bpf_insn_access_aux *info)
2417 {
2418 if (!bpf_tracing_ctx_access(off, size, type))
2419 return false;
2420 return btf_ctx_access(off, size, type, prog, info);
2421 }
2422
2423 int btf_struct_access(struct bpf_verifier_log *log,
2424 const struct bpf_reg_state *reg,
2425 int off, int size, enum bpf_access_type atype,
2426 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2427 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2428 const struct btf *btf, u32 id, int off,
2429 const struct btf *need_btf, u32 need_type_id,
2430 bool strict);
2431
2432 int btf_distill_func_proto(struct bpf_verifier_log *log,
2433 struct btf *btf,
2434 const struct btf_type *func_proto,
2435 const char *func_name,
2436 struct btf_func_model *m);
2437
2438 struct bpf_reg_state;
2439 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
2440 struct bpf_reg_state *regs);
2441 int btf_check_subprog_call(struct bpf_verifier_env *env, int subprog,
2442 struct bpf_reg_state *regs);
2443 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
2444 struct bpf_reg_state *reg);
2445 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2446 struct btf *btf, const struct btf_type *t);
2447
2448 struct bpf_prog *bpf_prog_by_id(u32 id);
2449 struct bpf_link *bpf_link_by_id(u32 id);
2450
2451 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
2452 void bpf_task_storage_free(struct task_struct *task);
2453 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2454 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2455 const struct btf_func_model *
2456 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2457 const struct bpf_insn *insn);
2458 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2459 u16 btf_fd_idx, u8 **func_addr);
2460
2461 struct bpf_core_ctx {
2462 struct bpf_verifier_log *log;
2463 const struct btf *btf;
2464 };
2465
2466 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2467 const struct bpf_reg_state *reg,
2468 const char *field_name, u32 btf_id, const char *suffix);
2469
2470 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2471 const struct btf *reg_btf, u32 reg_id,
2472 const struct btf *arg_btf, u32 arg_id);
2473
2474 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2475 int relo_idx, void *insn);
2476
unprivileged_ebpf_enabled(void)2477 static inline bool unprivileged_ebpf_enabled(void)
2478 {
2479 return !sysctl_unprivileged_bpf_disabled;
2480 }
2481
2482 /* Not all bpf prog type has the bpf_ctx.
2483 * For the bpf prog type that has initialized the bpf_ctx,
2484 * this function can be used to decide if a kernel function
2485 * is called by a bpf program.
2486 */
has_current_bpf_ctx(void)2487 static inline bool has_current_bpf_ctx(void)
2488 {
2489 return !!current->bpf_ctx;
2490 }
2491
2492 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2493
2494 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2495 enum bpf_dynptr_type type, u32 offset, u32 size);
2496 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2497 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2498 #else /* !CONFIG_BPF_SYSCALL */
bpf_prog_get(u32 ufd)2499 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2500 {
2501 return ERR_PTR(-EOPNOTSUPP);
2502 }
2503
bpf_prog_get_type_dev(u32 ufd,enum bpf_prog_type type,bool attach_drv)2504 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2505 enum bpf_prog_type type,
2506 bool attach_drv)
2507 {
2508 return ERR_PTR(-EOPNOTSUPP);
2509 }
2510
bpf_prog_add(struct bpf_prog * prog,int i)2511 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2512 {
2513 }
2514
bpf_prog_sub(struct bpf_prog * prog,int i)2515 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2516 {
2517 }
2518
bpf_prog_put(struct bpf_prog * prog)2519 static inline void bpf_prog_put(struct bpf_prog *prog)
2520 {
2521 }
2522
bpf_prog_inc(struct bpf_prog * prog)2523 static inline void bpf_prog_inc(struct bpf_prog *prog)
2524 {
2525 }
2526
2527 static inline struct bpf_prog *__must_check
bpf_prog_inc_not_zero(struct bpf_prog * prog)2528 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2529 {
2530 return ERR_PTR(-EOPNOTSUPP);
2531 }
2532
bpf_link_init(struct bpf_link * link,enum bpf_link_type type,const struct bpf_link_ops * ops,struct bpf_prog * prog)2533 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2534 const struct bpf_link_ops *ops,
2535 struct bpf_prog *prog)
2536 {
2537 }
2538
bpf_link_prime(struct bpf_link * link,struct bpf_link_primer * primer)2539 static inline int bpf_link_prime(struct bpf_link *link,
2540 struct bpf_link_primer *primer)
2541 {
2542 return -EOPNOTSUPP;
2543 }
2544
bpf_link_settle(struct bpf_link_primer * primer)2545 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2546 {
2547 return -EOPNOTSUPP;
2548 }
2549
bpf_link_cleanup(struct bpf_link_primer * primer)2550 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2551 {
2552 }
2553
bpf_link_inc(struct bpf_link * link)2554 static inline void bpf_link_inc(struct bpf_link *link)
2555 {
2556 }
2557
bpf_link_put(struct bpf_link * link)2558 static inline void bpf_link_put(struct bpf_link *link)
2559 {
2560 }
2561
bpf_obj_get_user(const char __user * pathname,int flags)2562 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2563 {
2564 return -EOPNOTSUPP;
2565 }
2566
__dev_flush(void)2567 static inline void __dev_flush(void)
2568 {
2569 }
2570
2571 struct xdp_frame;
2572 struct bpf_dtab_netdev;
2573 struct bpf_cpu_map_entry;
2574
2575 static inline
dev_xdp_enqueue(struct net_device * dev,struct xdp_frame * xdpf,struct net_device * dev_rx)2576 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2577 struct net_device *dev_rx)
2578 {
2579 return 0;
2580 }
2581
2582 static inline
dev_map_enqueue(struct bpf_dtab_netdev * dst,struct xdp_frame * xdpf,struct net_device * dev_rx)2583 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2584 struct net_device *dev_rx)
2585 {
2586 return 0;
2587 }
2588
2589 static inline
dev_map_enqueue_multi(struct xdp_frame * xdpf,struct net_device * dev_rx,struct bpf_map * map,bool exclude_ingress)2590 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2591 struct bpf_map *map, bool exclude_ingress)
2592 {
2593 return 0;
2594 }
2595
2596 struct sk_buff;
2597
dev_map_generic_redirect(struct bpf_dtab_netdev * dst,struct sk_buff * skb,struct bpf_prog * xdp_prog)2598 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2599 struct sk_buff *skb,
2600 struct bpf_prog *xdp_prog)
2601 {
2602 return 0;
2603 }
2604
2605 static inline
dev_map_redirect_multi(struct net_device * dev,struct sk_buff * skb,struct bpf_prog * xdp_prog,struct bpf_map * map,bool exclude_ingress)2606 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2607 struct bpf_prog *xdp_prog, struct bpf_map *map,
2608 bool exclude_ingress)
2609 {
2610 return 0;
2611 }
2612
__cpu_map_flush(void)2613 static inline void __cpu_map_flush(void)
2614 {
2615 }
2616
cpu_map_enqueue(struct bpf_cpu_map_entry * rcpu,struct xdp_frame * xdpf,struct net_device * dev_rx)2617 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2618 struct xdp_frame *xdpf,
2619 struct net_device *dev_rx)
2620 {
2621 return 0;
2622 }
2623
cpu_map_generic_redirect(struct bpf_cpu_map_entry * rcpu,struct sk_buff * skb)2624 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2625 struct sk_buff *skb)
2626 {
2627 return -EOPNOTSUPP;
2628 }
2629
bpf_prog_get_type_path(const char * name,enum bpf_prog_type type)2630 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2631 enum bpf_prog_type type)
2632 {
2633 return ERR_PTR(-EOPNOTSUPP);
2634 }
2635
bpf_prog_test_run_xdp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2636 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2637 const union bpf_attr *kattr,
2638 union bpf_attr __user *uattr)
2639 {
2640 return -ENOTSUPP;
2641 }
2642
bpf_prog_test_run_skb(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2643 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2644 const union bpf_attr *kattr,
2645 union bpf_attr __user *uattr)
2646 {
2647 return -ENOTSUPP;
2648 }
2649
bpf_prog_test_run_tracing(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2650 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2651 const union bpf_attr *kattr,
2652 union bpf_attr __user *uattr)
2653 {
2654 return -ENOTSUPP;
2655 }
2656
bpf_prog_test_run_flow_dissector(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2657 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2658 const union bpf_attr *kattr,
2659 union bpf_attr __user *uattr)
2660 {
2661 return -ENOTSUPP;
2662 }
2663
bpf_prog_test_run_sk_lookup(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2664 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2665 const union bpf_attr *kattr,
2666 union bpf_attr __user *uattr)
2667 {
2668 return -ENOTSUPP;
2669 }
2670
bpf_map_put(struct bpf_map * map)2671 static inline void bpf_map_put(struct bpf_map *map)
2672 {
2673 }
2674
bpf_prog_by_id(u32 id)2675 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2676 {
2677 return ERR_PTR(-ENOTSUPP);
2678 }
2679
btf_struct_access(struct bpf_verifier_log * log,const struct bpf_reg_state * reg,int off,int size,enum bpf_access_type atype,u32 * next_btf_id,enum bpf_type_flag * flag,const char ** field_name)2680 static inline int btf_struct_access(struct bpf_verifier_log *log,
2681 const struct bpf_reg_state *reg,
2682 int off, int size, enum bpf_access_type atype,
2683 u32 *next_btf_id, enum bpf_type_flag *flag,
2684 const char **field_name)
2685 {
2686 return -EACCES;
2687 }
2688
2689 static inline const struct bpf_func_proto *
bpf_base_func_proto(enum bpf_func_id func_id)2690 bpf_base_func_proto(enum bpf_func_id func_id)
2691 {
2692 return NULL;
2693 }
2694
bpf_task_storage_free(struct task_struct * task)2695 static inline void bpf_task_storage_free(struct task_struct *task)
2696 {
2697 }
2698
bpf_prog_has_kfunc_call(const struct bpf_prog * prog)2699 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2700 {
2701 return false;
2702 }
2703
2704 static inline const struct btf_func_model *
bpf_jit_find_kfunc_model(const struct bpf_prog * prog,const struct bpf_insn * insn)2705 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2706 const struct bpf_insn *insn)
2707 {
2708 return NULL;
2709 }
2710
2711 static inline int
bpf_get_kfunc_addr(const struct bpf_prog * prog,u32 func_id,u16 btf_fd_idx,u8 ** func_addr)2712 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2713 u16 btf_fd_idx, u8 **func_addr)
2714 {
2715 return -ENOTSUPP;
2716 }
2717
unprivileged_ebpf_enabled(void)2718 static inline bool unprivileged_ebpf_enabled(void)
2719 {
2720 return false;
2721 }
2722
has_current_bpf_ctx(void)2723 static inline bool has_current_bpf_ctx(void)
2724 {
2725 return false;
2726 }
2727
bpf_prog_inc_misses_counter(struct bpf_prog * prog)2728 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2729 {
2730 }
2731
bpf_cgrp_storage_free(struct cgroup * cgroup)2732 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
2733 {
2734 }
2735
bpf_dynptr_init(struct bpf_dynptr_kern * ptr,void * data,enum bpf_dynptr_type type,u32 offset,u32 size)2736 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2737 enum bpf_dynptr_type type, u32 offset, u32 size)
2738 {
2739 }
2740
bpf_dynptr_set_null(struct bpf_dynptr_kern * ptr)2741 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
2742 {
2743 }
2744
bpf_dynptr_set_rdonly(struct bpf_dynptr_kern * ptr)2745 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
2746 {
2747 }
2748 #endif /* CONFIG_BPF_SYSCALL */
2749
2750 static __always_inline int
bpf_probe_read_kernel_common(void * dst,u32 size,const void * unsafe_ptr)2751 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
2752 {
2753 int ret = -EFAULT;
2754
2755 if (IS_ENABLED(CONFIG_BPF_EVENTS))
2756 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
2757 if (unlikely(ret < 0))
2758 memset(dst, 0, size);
2759 return ret;
2760 }
2761
2762 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2763 struct btf_mod_pair *used_btfs, u32 len);
2764
bpf_prog_get_type(u32 ufd,enum bpf_prog_type type)2765 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2766 enum bpf_prog_type type)
2767 {
2768 return bpf_prog_get_type_dev(ufd, type, false);
2769 }
2770
2771 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2772 struct bpf_map **used_maps, u32 len);
2773
2774 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2775
2776 int bpf_prog_offload_compile(struct bpf_prog *prog);
2777 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
2778 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2779 struct bpf_prog *prog);
2780
2781 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2782
2783 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2784 int bpf_map_offload_update_elem(struct bpf_map *map,
2785 void *key, void *value, u64 flags);
2786 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2787 int bpf_map_offload_get_next_key(struct bpf_map *map,
2788 void *key, void *next_key);
2789
2790 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2791
2792 struct bpf_offload_dev *
2793 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2794 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2795 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2796 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2797 struct net_device *netdev);
2798 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2799 struct net_device *netdev);
2800 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2801
2802 void unpriv_ebpf_notify(int new_state);
2803
2804 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2805 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2806 struct bpf_prog_aux *prog_aux);
2807 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
2808 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
2809 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
2810 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
2811
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2812 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2813 {
2814 return aux->dev_bound;
2815 }
2816
bpf_prog_is_offloaded(const struct bpf_prog_aux * aux)2817 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
2818 {
2819 return aux->offload_requested;
2820 }
2821
2822 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
2823
bpf_map_is_offloaded(struct bpf_map * map)2824 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2825 {
2826 return unlikely(map->ops == &bpf_map_offload_ops);
2827 }
2828
2829 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2830 void bpf_map_offload_map_free(struct bpf_map *map);
2831 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
2832 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2833 const union bpf_attr *kattr,
2834 union bpf_attr __user *uattr);
2835
2836 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2837 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2838 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2839 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2840 union bpf_attr __user *uattr);
2841
2842 void sock_map_unhash(struct sock *sk);
2843 void sock_map_destroy(struct sock *sk);
2844 void sock_map_close(struct sock *sk, long timeout);
2845 #else
bpf_dev_bound_kfunc_check(struct bpf_verifier_log * log,struct bpf_prog_aux * prog_aux)2846 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2847 struct bpf_prog_aux *prog_aux)
2848 {
2849 return -EOPNOTSUPP;
2850 }
2851
bpf_dev_bound_resolve_kfunc(struct bpf_prog * prog,u32 func_id)2852 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
2853 u32 func_id)
2854 {
2855 return NULL;
2856 }
2857
bpf_prog_dev_bound_init(struct bpf_prog * prog,union bpf_attr * attr)2858 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
2859 union bpf_attr *attr)
2860 {
2861 return -EOPNOTSUPP;
2862 }
2863
bpf_prog_dev_bound_inherit(struct bpf_prog * new_prog,struct bpf_prog * old_prog)2864 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
2865 struct bpf_prog *old_prog)
2866 {
2867 return -EOPNOTSUPP;
2868 }
2869
bpf_dev_bound_netdev_unregister(struct net_device * dev)2870 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
2871 {
2872 }
2873
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2874 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2875 {
2876 return false;
2877 }
2878
bpf_prog_is_offloaded(struct bpf_prog_aux * aux)2879 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
2880 {
2881 return false;
2882 }
2883
bpf_prog_dev_bound_match(const struct bpf_prog * lhs,const struct bpf_prog * rhs)2884 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
2885 {
2886 return false;
2887 }
2888
bpf_map_is_offloaded(struct bpf_map * map)2889 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2890 {
2891 return false;
2892 }
2893
bpf_map_offload_map_alloc(union bpf_attr * attr)2894 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2895 {
2896 return ERR_PTR(-EOPNOTSUPP);
2897 }
2898
bpf_map_offload_map_free(struct bpf_map * map)2899 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2900 {
2901 }
2902
bpf_map_offload_map_mem_usage(const struct bpf_map * map)2903 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
2904 {
2905 return 0;
2906 }
2907
bpf_prog_test_run_syscall(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2908 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2909 const union bpf_attr *kattr,
2910 union bpf_attr __user *uattr)
2911 {
2912 return -ENOTSUPP;
2913 }
2914
2915 #ifdef CONFIG_BPF_SYSCALL
sock_map_get_from_fd(const union bpf_attr * attr,struct bpf_prog * prog)2916 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2917 struct bpf_prog *prog)
2918 {
2919 return -EINVAL;
2920 }
2921
sock_map_prog_detach(const union bpf_attr * attr,enum bpf_prog_type ptype)2922 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2923 enum bpf_prog_type ptype)
2924 {
2925 return -EOPNOTSUPP;
2926 }
2927
sock_map_update_elem_sys(struct bpf_map * map,void * key,void * value,u64 flags)2928 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2929 u64 flags)
2930 {
2931 return -EOPNOTSUPP;
2932 }
2933
sock_map_bpf_prog_query(const union bpf_attr * attr,union bpf_attr __user * uattr)2934 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2935 union bpf_attr __user *uattr)
2936 {
2937 return -EINVAL;
2938 }
2939 #endif /* CONFIG_BPF_SYSCALL */
2940 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2941
2942 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2943 void bpf_sk_reuseport_detach(struct sock *sk);
2944 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2945 void *value);
2946 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2947 void *value, u64 map_flags);
2948 #else
bpf_sk_reuseport_detach(struct sock * sk)2949 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2950 {
2951 }
2952
2953 #ifdef CONFIG_BPF_SYSCALL
bpf_fd_reuseport_array_lookup_elem(struct bpf_map * map,void * key,void * value)2954 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2955 void *key, void *value)
2956 {
2957 return -EOPNOTSUPP;
2958 }
2959
bpf_fd_reuseport_array_update_elem(struct bpf_map * map,void * key,void * value,u64 map_flags)2960 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2961 void *key, void *value,
2962 u64 map_flags)
2963 {
2964 return -EOPNOTSUPP;
2965 }
2966 #endif /* CONFIG_BPF_SYSCALL */
2967 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2968
2969 /* verifier prototypes for helper functions called from eBPF programs */
2970 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2971 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2972 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2973 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2974 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2975 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2976 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
2977
2978 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2979 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2980 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2981 extern const struct bpf_func_proto bpf_tail_call_proto;
2982 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2983 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2984 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
2985 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2986 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2987 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2988 extern const struct bpf_func_proto bpf_get_stackid_proto;
2989 extern const struct bpf_func_proto bpf_get_stack_proto;
2990 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2991 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2992 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2993 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2994 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2995 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2996 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2997 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
2998 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2999 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3000 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3001 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3002 extern const struct bpf_func_proto bpf_spin_lock_proto;
3003 extern const struct bpf_func_proto bpf_spin_unlock_proto;
3004 extern const struct bpf_func_proto bpf_get_local_storage_proto;
3005 extern const struct bpf_func_proto bpf_strtol_proto;
3006 extern const struct bpf_func_proto bpf_strtoul_proto;
3007 extern const struct bpf_func_proto bpf_tcp_sock_proto;
3008 extern const struct bpf_func_proto bpf_jiffies64_proto;
3009 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3010 extern const struct bpf_func_proto bpf_event_output_data_proto;
3011 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3012 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3013 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3014 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3015 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3016 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3017 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3018 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3019 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3020 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3021 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3022 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3023 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3024 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3025 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3026 extern const struct bpf_func_proto bpf_copy_from_user_proto;
3027 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3028 extern const struct bpf_func_proto bpf_snprintf_proto;
3029 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3030 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3031 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3032 extern const struct bpf_func_proto bpf_sock_from_file_proto;
3033 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3034 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3035 extern const struct bpf_func_proto bpf_task_storage_get_proto;
3036 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3037 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3038 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3039 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3040 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3041 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3042 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3043 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3044 extern const struct bpf_func_proto bpf_find_vma_proto;
3045 extern const struct bpf_func_proto bpf_loop_proto;
3046 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3047 extern const struct bpf_func_proto bpf_set_retval_proto;
3048 extern const struct bpf_func_proto bpf_get_retval_proto;
3049 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3050 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3051 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3052
3053 const struct bpf_func_proto *tracing_prog_func_proto(
3054 enum bpf_func_id func_id, const struct bpf_prog *prog);
3055
3056 /* Shared helpers among cBPF and eBPF. */
3057 void bpf_user_rnd_init_once(void);
3058 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3059 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3060
3061 #if defined(CONFIG_NET)
3062 bool bpf_sock_common_is_valid_access(int off, int size,
3063 enum bpf_access_type type,
3064 struct bpf_insn_access_aux *info);
3065 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3066 struct bpf_insn_access_aux *info);
3067 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3068 const struct bpf_insn *si,
3069 struct bpf_insn *insn_buf,
3070 struct bpf_prog *prog,
3071 u32 *target_size);
3072 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3073 struct bpf_dynptr_kern *ptr);
3074 #else
bpf_sock_common_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3075 static inline bool bpf_sock_common_is_valid_access(int off, int size,
3076 enum bpf_access_type type,
3077 struct bpf_insn_access_aux *info)
3078 {
3079 return false;
3080 }
bpf_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3081 static inline bool bpf_sock_is_valid_access(int off, int size,
3082 enum bpf_access_type type,
3083 struct bpf_insn_access_aux *info)
3084 {
3085 return false;
3086 }
bpf_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3087 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3088 const struct bpf_insn *si,
3089 struct bpf_insn *insn_buf,
3090 struct bpf_prog *prog,
3091 u32 *target_size)
3092 {
3093 return 0;
3094 }
bpf_dynptr_from_skb_rdonly(struct sk_buff * skb,u64 flags,struct bpf_dynptr_kern * ptr)3095 static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3096 struct bpf_dynptr_kern *ptr)
3097 {
3098 return -EOPNOTSUPP;
3099 }
3100 #endif
3101
3102 #ifdef CONFIG_INET
3103 struct sk_reuseport_kern {
3104 struct sk_buff *skb;
3105 struct sock *sk;
3106 struct sock *selected_sk;
3107 struct sock *migrating_sk;
3108 void *data_end;
3109 u32 hash;
3110 u32 reuseport_id;
3111 bool bind_inany;
3112 };
3113 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3114 struct bpf_insn_access_aux *info);
3115
3116 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3117 const struct bpf_insn *si,
3118 struct bpf_insn *insn_buf,
3119 struct bpf_prog *prog,
3120 u32 *target_size);
3121
3122 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3123 struct bpf_insn_access_aux *info);
3124
3125 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3126 const struct bpf_insn *si,
3127 struct bpf_insn *insn_buf,
3128 struct bpf_prog *prog,
3129 u32 *target_size);
3130 #else
bpf_tcp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3131 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3132 enum bpf_access_type type,
3133 struct bpf_insn_access_aux *info)
3134 {
3135 return false;
3136 }
3137
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3138 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3139 const struct bpf_insn *si,
3140 struct bpf_insn *insn_buf,
3141 struct bpf_prog *prog,
3142 u32 *target_size)
3143 {
3144 return 0;
3145 }
bpf_xdp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3146 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3147 enum bpf_access_type type,
3148 struct bpf_insn_access_aux *info)
3149 {
3150 return false;
3151 }
3152
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3153 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3154 const struct bpf_insn *si,
3155 struct bpf_insn *insn_buf,
3156 struct bpf_prog *prog,
3157 u32 *target_size)
3158 {
3159 return 0;
3160 }
3161 #endif /* CONFIG_INET */
3162
3163 enum bpf_text_poke_type {
3164 BPF_MOD_CALL,
3165 BPF_MOD_JUMP,
3166 };
3167
3168 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3169 void *addr1, void *addr2);
3170
3171 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3172 struct bpf_prog *new, struct bpf_prog *old);
3173
3174 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3175 int bpf_arch_text_invalidate(void *dst, size_t len);
3176
3177 struct btf_id_set;
3178 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3179
3180 #define MAX_BPRINTF_VARARGS 12
3181 #define MAX_BPRINTF_BUF 1024
3182
3183 struct bpf_bprintf_data {
3184 u32 *bin_args;
3185 char *buf;
3186 bool get_bin_args;
3187 bool get_buf;
3188 };
3189
3190 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3191 u32 num_args, struct bpf_bprintf_data *data);
3192 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3193
3194 #ifdef CONFIG_BPF_LSM
3195 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3196 void bpf_cgroup_atype_put(int cgroup_atype);
3197 #else
bpf_cgroup_atype_get(u32 attach_btf_id,int cgroup_atype)3198 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
bpf_cgroup_atype_put(int cgroup_atype)3199 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3200 #endif /* CONFIG_BPF_LSM */
3201
3202 struct key;
3203
3204 #ifdef CONFIG_KEYS
3205 struct bpf_key {
3206 struct key *key;
3207 bool has_ref;
3208 };
3209 #endif /* CONFIG_KEYS */
3210
type_is_alloc(u32 type)3211 static inline bool type_is_alloc(u32 type)
3212 {
3213 return type & MEM_ALLOC;
3214 }
3215
bpf_memcg_flags(gfp_t flags)3216 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3217 {
3218 if (memcg_bpf_enabled())
3219 return flags | __GFP_ACCOUNT;
3220 return flags;
3221 }
3222
3223 #endif /* _LINUX_BPF_H */
3224