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 const struct btf_type *attach_func_proto;
292 spinlock_t lock;
293 enum bpf_prog_type type;
294 bool jited;
295 bool xdp_has_frags;
296 } owner;
297 bool bypass_spec_v1;
298 bool frozen; /* write-once; write-protected by freeze_mutex */
299 bool free_after_mult_rcu_gp;
300 bool free_after_rcu_gp;
301 atomic64_t sleepable_refcnt;
302 s64 __percpu *elem_count;
303 };
304
btf_field_type_name(enum btf_field_type type)305 static inline const char *btf_field_type_name(enum btf_field_type type)
306 {
307 switch (type) {
308 case BPF_SPIN_LOCK:
309 return "bpf_spin_lock";
310 case BPF_TIMER:
311 return "bpf_timer";
312 case BPF_KPTR_UNREF:
313 case BPF_KPTR_REF:
314 return "kptr";
315 case BPF_LIST_HEAD:
316 return "bpf_list_head";
317 case BPF_LIST_NODE:
318 return "bpf_list_node";
319 case BPF_RB_ROOT:
320 return "bpf_rb_root";
321 case BPF_RB_NODE:
322 return "bpf_rb_node";
323 case BPF_REFCOUNT:
324 return "bpf_refcount";
325 default:
326 WARN_ON_ONCE(1);
327 return "unknown";
328 }
329 }
330
btf_field_type_size(enum btf_field_type type)331 static inline u32 btf_field_type_size(enum btf_field_type type)
332 {
333 switch (type) {
334 case BPF_SPIN_LOCK:
335 return sizeof(struct bpf_spin_lock);
336 case BPF_TIMER:
337 return sizeof(struct bpf_timer);
338 case BPF_KPTR_UNREF:
339 case BPF_KPTR_REF:
340 return sizeof(u64);
341 case BPF_LIST_HEAD:
342 return sizeof(struct bpf_list_head);
343 case BPF_LIST_NODE:
344 return sizeof(struct bpf_list_node);
345 case BPF_RB_ROOT:
346 return sizeof(struct bpf_rb_root);
347 case BPF_RB_NODE:
348 return sizeof(struct bpf_rb_node);
349 case BPF_REFCOUNT:
350 return sizeof(struct bpf_refcount);
351 default:
352 WARN_ON_ONCE(1);
353 return 0;
354 }
355 }
356
btf_field_type_align(enum btf_field_type type)357 static inline u32 btf_field_type_align(enum btf_field_type type)
358 {
359 switch (type) {
360 case BPF_SPIN_LOCK:
361 return __alignof__(struct bpf_spin_lock);
362 case BPF_TIMER:
363 return __alignof__(struct bpf_timer);
364 case BPF_KPTR_UNREF:
365 case BPF_KPTR_REF:
366 return __alignof__(u64);
367 case BPF_LIST_HEAD:
368 return __alignof__(struct bpf_list_head);
369 case BPF_LIST_NODE:
370 return __alignof__(struct bpf_list_node);
371 case BPF_RB_ROOT:
372 return __alignof__(struct bpf_rb_root);
373 case BPF_RB_NODE:
374 return __alignof__(struct bpf_rb_node);
375 case BPF_REFCOUNT:
376 return __alignof__(struct bpf_refcount);
377 default:
378 WARN_ON_ONCE(1);
379 return 0;
380 }
381 }
382
bpf_obj_init_field(const struct btf_field * field,void * addr)383 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
384 {
385 memset(addr, 0, field->size);
386
387 switch (field->type) {
388 case BPF_REFCOUNT:
389 refcount_set((refcount_t *)addr, 1);
390 break;
391 case BPF_RB_NODE:
392 RB_CLEAR_NODE((struct rb_node *)addr);
393 break;
394 case BPF_LIST_HEAD:
395 case BPF_LIST_NODE:
396 INIT_LIST_HEAD((struct list_head *)addr);
397 break;
398 case BPF_RB_ROOT:
399 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
400 case BPF_SPIN_LOCK:
401 case BPF_TIMER:
402 case BPF_KPTR_UNREF:
403 case BPF_KPTR_REF:
404 break;
405 default:
406 WARN_ON_ONCE(1);
407 return;
408 }
409 }
410
btf_record_has_field(const struct btf_record * rec,enum btf_field_type type)411 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
412 {
413 if (IS_ERR_OR_NULL(rec))
414 return false;
415 return rec->field_mask & type;
416 }
417
bpf_obj_init(const struct btf_record * rec,void * obj)418 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
419 {
420 int i;
421
422 if (IS_ERR_OR_NULL(rec))
423 return;
424 for (i = 0; i < rec->cnt; i++)
425 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
426 }
427
428 /* 'dst' must be a temporary buffer and should not point to memory that is being
429 * used in parallel by a bpf program or bpf syscall, otherwise the access from
430 * the bpf program or bpf syscall may be corrupted by the reinitialization,
431 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
432 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
433 * program or bpf syscall.
434 */
check_and_init_map_value(struct bpf_map * map,void * dst)435 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
436 {
437 bpf_obj_init(map->record, dst);
438 }
439
440 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
441 * forced to use 'long' read/writes to try to atomically copy long counters.
442 * Best-effort only. No barriers here, since it _will_ race with concurrent
443 * updates from BPF programs. Called from bpf syscall and mostly used with
444 * size 8 or 16 bytes, so ask compiler to inline it.
445 */
bpf_long_memcpy(void * dst,const void * src,u32 size)446 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
447 {
448 const long *lsrc = src;
449 long *ldst = dst;
450
451 size /= sizeof(long);
452 while (size--)
453 data_race(*ldst++ = *lsrc++);
454 }
455
456 /* 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)457 static inline void bpf_obj_memcpy(struct btf_record *rec,
458 void *dst, void *src, u32 size,
459 bool long_memcpy)
460 {
461 u32 curr_off = 0;
462 int i;
463
464 if (IS_ERR_OR_NULL(rec)) {
465 if (long_memcpy)
466 bpf_long_memcpy(dst, src, round_up(size, 8));
467 else
468 memcpy(dst, src, size);
469 return;
470 }
471
472 for (i = 0; i < rec->cnt; i++) {
473 u32 next_off = rec->fields[i].offset;
474 u32 sz = next_off - curr_off;
475
476 memcpy(dst + curr_off, src + curr_off, sz);
477 curr_off += rec->fields[i].size + sz;
478 }
479 memcpy(dst + curr_off, src + curr_off, size - curr_off);
480 }
481
copy_map_value(struct bpf_map * map,void * dst,void * src)482 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
483 {
484 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
485 }
486
copy_map_value_long(struct bpf_map * map,void * dst,void * src)487 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
488 {
489 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
490 }
491
bpf_obj_memzero(struct btf_record * rec,void * dst,u32 size)492 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
493 {
494 u32 curr_off = 0;
495 int i;
496
497 if (IS_ERR_OR_NULL(rec)) {
498 memset(dst, 0, size);
499 return;
500 }
501
502 for (i = 0; i < rec->cnt; i++) {
503 u32 next_off = rec->fields[i].offset;
504 u32 sz = next_off - curr_off;
505
506 memset(dst + curr_off, 0, sz);
507 curr_off += rec->fields[i].size + sz;
508 }
509 memset(dst + curr_off, 0, size - curr_off);
510 }
511
zero_map_value(struct bpf_map * map,void * dst)512 static inline void zero_map_value(struct bpf_map *map, void *dst)
513 {
514 bpf_obj_memzero(map->record, dst, map->value_size);
515 }
516
517 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
518 bool lock_src);
519 void bpf_timer_cancel_and_free(void *timer);
520 void bpf_list_head_free(const struct btf_field *field, void *list_head,
521 struct bpf_spin_lock *spin_lock);
522 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
523 struct bpf_spin_lock *spin_lock);
524
525
526 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
527
528 struct bpf_offload_dev;
529 struct bpf_offloaded_map;
530
531 struct bpf_map_dev_ops {
532 int (*map_get_next_key)(struct bpf_offloaded_map *map,
533 void *key, void *next_key);
534 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
535 void *key, void *value);
536 int (*map_update_elem)(struct bpf_offloaded_map *map,
537 void *key, void *value, u64 flags);
538 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
539 };
540
541 struct bpf_offloaded_map {
542 struct bpf_map map;
543 struct net_device *netdev;
544 const struct bpf_map_dev_ops *dev_ops;
545 void *dev_priv;
546 struct list_head offloads;
547 };
548
map_to_offmap(struct bpf_map * map)549 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
550 {
551 return container_of(map, struct bpf_offloaded_map, map);
552 }
553
bpf_map_offload_neutral(const struct bpf_map * map)554 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
555 {
556 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
557 }
558
bpf_map_support_seq_show(const struct bpf_map * map)559 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
560 {
561 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
562 map->ops->map_seq_show_elem;
563 }
564
565 int map_check_no_btf(const struct bpf_map *map,
566 const struct btf *btf,
567 const struct btf_type *key_type,
568 const struct btf_type *value_type);
569
570 bool bpf_map_meta_equal(const struct bpf_map *meta0,
571 const struct bpf_map *meta1);
572
573 extern const struct bpf_map_ops bpf_map_offload_ops;
574
575 /* bpf_type_flag contains a set of flags that are applicable to the values of
576 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
577 * or a memory is read-only. We classify types into two categories: base types
578 * and extended types. Extended types are base types combined with a type flag.
579 *
580 * Currently there are no more than 32 base types in arg_type, ret_type and
581 * reg_types.
582 */
583 #define BPF_BASE_TYPE_BITS 8
584
585 enum bpf_type_flag {
586 /* PTR may be NULL. */
587 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
588
589 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
590 * compatible with both mutable and immutable memory.
591 */
592 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
593
594 /* MEM points to BPF ring buffer reservation. */
595 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
596
597 /* MEM is in user address space. */
598 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
599
600 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
601 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
602 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
603 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
604 * to the specified cpu.
605 */
606 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
607
608 /* Indicates that the argument will be released. */
609 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
610
611 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
612 * unreferenced and referenced kptr loaded from map value using a load
613 * instruction, so that they can only be dereferenced but not escape the
614 * BPF program into the kernel (i.e. cannot be passed as arguments to
615 * kfunc or bpf helpers).
616 */
617 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
618
619 /* MEM can be uninitialized. */
620 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
621
622 /* DYNPTR points to memory local to the bpf program. */
623 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
624
625 /* DYNPTR points to a kernel-produced ringbuf record. */
626 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
627
628 /* Size is known at compile time. */
629 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
630
631 /* MEM is of an allocated object of type in program BTF. This is used to
632 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
633 */
634 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
635
636 /* PTR was passed from the kernel in a trusted context, and may be
637 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
638 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
639 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
640 * without invoking bpf_kptr_xchg(). What we really need to know is
641 * whether a pointer is safe to pass to a kfunc or BPF helper function.
642 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
643 * helpers, they do not cover all possible instances of unsafe
644 * pointers. For example, a pointer that was obtained from walking a
645 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
646 * fact that it may be NULL, invalid, etc. This is due to backwards
647 * compatibility requirements, as this was the behavior that was first
648 * introduced when kptrs were added. The behavior is now considered
649 * deprecated, and PTR_UNTRUSTED will eventually be removed.
650 *
651 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
652 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
653 * For example, pointers passed to tracepoint arguments are considered
654 * PTR_TRUSTED, as are pointers that are passed to struct_ops
655 * callbacks. As alluded to above, pointers that are obtained from
656 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
657 * struct task_struct *task is PTR_TRUSTED, then accessing
658 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
659 * in a BPF register. Similarly, pointers passed to certain programs
660 * types such as kretprobes are not guaranteed to be valid, as they may
661 * for example contain an object that was recently freed.
662 */
663 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
664
665 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
666 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
667
668 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
669 * Currently only valid for linked-list and rbtree nodes. If the nodes
670 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
671 */
672 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
673
674 /* DYNPTR points to sk_buff */
675 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
676
677 /* DYNPTR points to xdp_buff */
678 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
679
680 /* Memory must be aligned on some architectures, used in combination with
681 * MEM_FIXED_SIZE.
682 */
683 MEM_ALIGNED = BIT(17 + BPF_BASE_TYPE_BITS),
684
685 /* MEM is being written to, often combined with MEM_UNINIT. Non-presence
686 * of MEM_WRITE means that MEM is only being read. MEM_WRITE without the
687 * MEM_UNINIT means that memory needs to be initialized since it is also
688 * read.
689 */
690 MEM_WRITE = BIT(18 + BPF_BASE_TYPE_BITS),
691
692 __BPF_TYPE_FLAG_MAX,
693 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
694 };
695
696 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
697 | DYNPTR_TYPE_XDP)
698
699 /* Max number of base types. */
700 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
701
702 /* Max number of all types. */
703 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
704
705 /* function argument constraints */
706 enum bpf_arg_type {
707 ARG_DONTCARE = 0, /* unused argument in helper function */
708
709 /* the following constraints used to prototype
710 * bpf_map_lookup/update/delete_elem() functions
711 */
712 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
713 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
714 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
715
716 /* Used to prototype bpf_memcmp() and other functions that access data
717 * on eBPF program stack
718 */
719 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
720
721 ARG_CONST_SIZE, /* number of bytes accessed from memory */
722 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
723
724 ARG_PTR_TO_CTX, /* pointer to context */
725 ARG_ANYTHING, /* any (initialized) argument is ok */
726 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
727 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
728 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
729 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
730 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
731 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
732 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
733 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
734 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
735 ARG_PTR_TO_STACK, /* pointer to stack */
736 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
737 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
738 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */
739 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
740 __BPF_ARG_TYPE_MAX,
741
742 /* Extended arg_types. */
743 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
744 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
745 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
746 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
747 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
748 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
749 /* Pointer to memory does not need to be initialized, since helper function
750 * fills all bytes or clears them in error case.
751 */
752 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | MEM_WRITE | ARG_PTR_TO_MEM,
753 /* Pointer to valid memory of size known at compile time. */
754 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
755
756 /* This must be the last entry. Its purpose is to ensure the enum is
757 * wide enough to hold the higher bits reserved for bpf_type_flag.
758 */
759 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
760 };
761 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
762
763 /* type of values returned from helper functions */
764 enum bpf_return_type {
765 RET_INTEGER, /* function returns integer */
766 RET_VOID, /* function doesn't return anything */
767 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
768 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
769 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
770 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
771 RET_PTR_TO_MEM, /* returns a pointer to memory */
772 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
773 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
774 __BPF_RET_TYPE_MAX,
775
776 /* Extended ret_types. */
777 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
778 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
779 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
780 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
781 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
782 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
783 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
784 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
785
786 /* This must be the last entry. Its purpose is to ensure the enum is
787 * wide enough to hold the higher bits reserved for bpf_type_flag.
788 */
789 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
790 };
791 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
792
793 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
794 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
795 * instructions after verifying
796 */
797 struct bpf_func_proto {
798 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
799 bool gpl_only;
800 bool pkt_access;
801 bool might_sleep;
802 enum bpf_return_type ret_type;
803 union {
804 struct {
805 enum bpf_arg_type arg1_type;
806 enum bpf_arg_type arg2_type;
807 enum bpf_arg_type arg3_type;
808 enum bpf_arg_type arg4_type;
809 enum bpf_arg_type arg5_type;
810 };
811 enum bpf_arg_type arg_type[5];
812 };
813 union {
814 struct {
815 u32 *arg1_btf_id;
816 u32 *arg2_btf_id;
817 u32 *arg3_btf_id;
818 u32 *arg4_btf_id;
819 u32 *arg5_btf_id;
820 };
821 u32 *arg_btf_id[5];
822 struct {
823 size_t arg1_size;
824 size_t arg2_size;
825 size_t arg3_size;
826 size_t arg4_size;
827 size_t arg5_size;
828 };
829 size_t arg_size[5];
830 };
831 int *ret_btf_id; /* return value btf_id */
832 bool (*allowed)(const struct bpf_prog *prog);
833 };
834
835 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
836 * the first argument to eBPF programs.
837 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
838 */
839 struct bpf_context;
840
841 enum bpf_access_type {
842 BPF_READ = 1,
843 BPF_WRITE = 2
844 };
845
846 /* types of values stored in eBPF registers */
847 /* Pointer types represent:
848 * pointer
849 * pointer + imm
850 * pointer + (u16) var
851 * pointer + (u16) var + imm
852 * if (range > 0) then [ptr, ptr + range - off) is safe to access
853 * if (id > 0) means that some 'var' was added
854 * if (off > 0) means that 'imm' was added
855 */
856 enum bpf_reg_type {
857 NOT_INIT = 0, /* nothing was written into register */
858 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
859 PTR_TO_CTX, /* reg points to bpf_context */
860 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
861 PTR_TO_MAP_VALUE, /* reg points to map element value */
862 PTR_TO_MAP_KEY, /* reg points to a map element key */
863 PTR_TO_STACK, /* reg == frame_pointer + offset */
864 PTR_TO_PACKET_META, /* skb->data - meta_len */
865 PTR_TO_PACKET, /* reg points to skb->data */
866 PTR_TO_PACKET_END, /* skb->data + headlen */
867 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
868 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
869 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
870 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
871 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
872 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
873 /* PTR_TO_BTF_ID points to a kernel struct that does not need
874 * to be null checked by the BPF program. This does not imply the
875 * pointer is _not_ null and in practice this can easily be a null
876 * pointer when reading pointer chains. The assumption is program
877 * context will handle null pointer dereference typically via fault
878 * handling. The verifier must keep this in mind and can make no
879 * assumptions about null or non-null when doing branch analysis.
880 * Further, when passed into helpers the helpers can not, without
881 * additional context, assume the value is non-null.
882 */
883 PTR_TO_BTF_ID,
884 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
885 * been checked for null. Used primarily to inform the verifier
886 * an explicit null check is required for this struct.
887 */
888 PTR_TO_MEM, /* reg points to valid memory region */
889 PTR_TO_BUF, /* reg points to a read/write buffer */
890 PTR_TO_FUNC, /* reg points to a bpf program function */
891 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
892 __BPF_REG_TYPE_MAX,
893
894 /* Extended reg_types. */
895 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
896 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
897 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
898 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
899 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
900
901 /* This must be the last entry. Its purpose is to ensure the enum is
902 * wide enough to hold the higher bits reserved for bpf_type_flag.
903 */
904 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
905 };
906 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
907
908 /* The information passed from prog-specific *_is_valid_access
909 * back to the verifier.
910 */
911 struct bpf_insn_access_aux {
912 enum bpf_reg_type reg_type;
913 union {
914 int ctx_field_size;
915 struct {
916 struct btf *btf;
917 u32 btf_id;
918 };
919 };
920 struct bpf_verifier_log *log; /* for verbose logs */
921 };
922
923 static inline void
bpf_ctx_record_field_size(struct bpf_insn_access_aux * aux,u32 size)924 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
925 {
926 aux->ctx_field_size = size;
927 }
928
bpf_is_ldimm64(const struct bpf_insn * insn)929 static bool bpf_is_ldimm64(const struct bpf_insn *insn)
930 {
931 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
932 }
933
bpf_pseudo_func(const struct bpf_insn * insn)934 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
935 {
936 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
937 }
938
939 struct bpf_prog_ops {
940 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
941 union bpf_attr __user *uattr);
942 };
943
944 struct bpf_reg_state;
945 struct bpf_verifier_ops {
946 /* return eBPF function prototype for verification */
947 const struct bpf_func_proto *
948 (*get_func_proto)(enum bpf_func_id func_id,
949 const struct bpf_prog *prog);
950
951 /* return true if 'size' wide access at offset 'off' within bpf_context
952 * with 'type' (read or write) is allowed
953 */
954 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
955 const struct bpf_prog *prog,
956 struct bpf_insn_access_aux *info);
957 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
958 const struct bpf_prog *prog);
959 int (*gen_ld_abs)(const struct bpf_insn *orig,
960 struct bpf_insn *insn_buf);
961 u32 (*convert_ctx_access)(enum bpf_access_type type,
962 const struct bpf_insn *src,
963 struct bpf_insn *dst,
964 struct bpf_prog *prog, u32 *target_size);
965 int (*btf_struct_access)(struct bpf_verifier_log *log,
966 const struct bpf_reg_state *reg,
967 int off, int size);
968 };
969
970 struct bpf_prog_offload_ops {
971 /* verifier basic callbacks */
972 int (*insn_hook)(struct bpf_verifier_env *env,
973 int insn_idx, int prev_insn_idx);
974 int (*finalize)(struct bpf_verifier_env *env);
975 /* verifier optimization callbacks (called after .finalize) */
976 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
977 struct bpf_insn *insn);
978 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
979 /* program management callbacks */
980 int (*prepare)(struct bpf_prog *prog);
981 int (*translate)(struct bpf_prog *prog);
982 void (*destroy)(struct bpf_prog *prog);
983 };
984
985 struct bpf_prog_offload {
986 struct bpf_prog *prog;
987 struct net_device *netdev;
988 struct bpf_offload_dev *offdev;
989 void *dev_priv;
990 struct list_head offloads;
991 bool dev_state;
992 bool opt_failed;
993 void *jited_image;
994 u32 jited_len;
995 };
996
997 enum bpf_cgroup_storage_type {
998 BPF_CGROUP_STORAGE_SHARED,
999 BPF_CGROUP_STORAGE_PERCPU,
1000 __BPF_CGROUP_STORAGE_MAX
1001 };
1002
1003 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
1004
1005 /* The longest tracepoint has 12 args.
1006 * See include/trace/bpf_probe.h
1007 */
1008 #define MAX_BPF_FUNC_ARGS 12
1009
1010 /* The maximum number of arguments passed through registers
1011 * a single function may have.
1012 */
1013 #define MAX_BPF_FUNC_REG_ARGS 5
1014
1015 /* The argument is a structure. */
1016 #define BTF_FMODEL_STRUCT_ARG BIT(0)
1017
1018 /* The argument is signed. */
1019 #define BTF_FMODEL_SIGNED_ARG BIT(1)
1020
1021 struct btf_func_model {
1022 u8 ret_size;
1023 u8 ret_flags;
1024 u8 nr_args;
1025 u8 arg_size[MAX_BPF_FUNC_ARGS];
1026 u8 arg_flags[MAX_BPF_FUNC_ARGS];
1027 };
1028
1029 /* Restore arguments before returning from trampoline to let original function
1030 * continue executing. This flag is used for fentry progs when there are no
1031 * fexit progs.
1032 */
1033 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1034 /* Call original function after fentry progs, but before fexit progs.
1035 * Makes sense for fentry/fexit, normal calls and indirect calls.
1036 */
1037 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
1038 /* Skip current frame and return to parent. Makes sense for fentry/fexit
1039 * programs only. Should not be used with normal calls and indirect calls.
1040 */
1041 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1042 /* Store IP address of the caller on the trampoline stack,
1043 * so it's available for trampoline's programs.
1044 */
1045 #define BPF_TRAMP_F_IP_ARG BIT(3)
1046 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1047 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1048
1049 /* Get original function from stack instead of from provided direct address.
1050 * Makes sense for trampolines with fexit or fmod_ret programs.
1051 */
1052 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
1053
1054 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1055 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1056 */
1057 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1058
1059 /* Indicate that current trampoline is in a tail call context. Then, it has to
1060 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1061 */
1062 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1063
1064 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1065 * bytes on x86.
1066 */
1067 enum {
1068 #if defined(__s390x__)
1069 BPF_MAX_TRAMP_LINKS = 27,
1070 #else
1071 BPF_MAX_TRAMP_LINKS = 38,
1072 #endif
1073 };
1074
1075 struct bpf_tramp_links {
1076 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1077 int nr_links;
1078 };
1079
1080 struct bpf_tramp_run_ctx;
1081
1082 /* Different use cases for BPF trampoline:
1083 * 1. replace nop at the function entry (kprobe equivalent)
1084 * flags = BPF_TRAMP_F_RESTORE_REGS
1085 * fentry = a set of programs to run before returning from trampoline
1086 *
1087 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1088 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1089 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1090 * fentry = a set of program to run before calling original function
1091 * fexit = a set of program to run after original function
1092 *
1093 * 3. replace direct call instruction anywhere in the function body
1094 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1095 * With flags = 0
1096 * fentry = a set of programs to run before returning from trampoline
1097 * With flags = BPF_TRAMP_F_CALL_ORIG
1098 * orig_call = original callback addr or direct function addr
1099 * fentry = a set of program to run before calling original function
1100 * fexit = a set of program to run after original function
1101 */
1102 struct bpf_tramp_image;
1103 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
1104 const struct btf_func_model *m, u32 flags,
1105 struct bpf_tramp_links *tlinks,
1106 void *orig_call);
1107 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1108 struct bpf_tramp_run_ctx *run_ctx);
1109 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1110 struct bpf_tramp_run_ctx *run_ctx);
1111 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1112 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1113 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1114 struct bpf_tramp_run_ctx *run_ctx);
1115 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1116 struct bpf_tramp_run_ctx *run_ctx);
1117 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1118 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1119
1120 struct bpf_ksym {
1121 unsigned long start;
1122 unsigned long end;
1123 char name[KSYM_NAME_LEN];
1124 struct list_head lnode;
1125 struct latch_tree_node tnode;
1126 bool prog;
1127 };
1128
1129 enum bpf_tramp_prog_type {
1130 BPF_TRAMP_FENTRY,
1131 BPF_TRAMP_FEXIT,
1132 BPF_TRAMP_MODIFY_RETURN,
1133 BPF_TRAMP_MAX,
1134 BPF_TRAMP_REPLACE, /* more than MAX */
1135 };
1136
1137 struct bpf_tramp_image {
1138 void *image;
1139 struct bpf_ksym ksym;
1140 struct percpu_ref pcref;
1141 void *ip_after_call;
1142 void *ip_epilogue;
1143 union {
1144 struct rcu_head rcu;
1145 struct work_struct work;
1146 };
1147 };
1148
1149 struct bpf_trampoline {
1150 /* hlist for trampoline_table */
1151 struct hlist_node hlist;
1152 struct ftrace_ops *fops;
1153 /* serializes access to fields of this trampoline */
1154 struct mutex mutex;
1155 refcount_t refcnt;
1156 u32 flags;
1157 u64 key;
1158 struct {
1159 struct btf_func_model model;
1160 void *addr;
1161 bool ftrace_managed;
1162 } func;
1163 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1164 * program by replacing one of its functions. func.addr is the address
1165 * of the function it replaced.
1166 */
1167 struct bpf_prog *extension_prog;
1168 /* list of BPF programs using this trampoline */
1169 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1170 /* Number of attached programs. A counter per kind. */
1171 int progs_cnt[BPF_TRAMP_MAX];
1172 /* Executable image of trampoline */
1173 struct bpf_tramp_image *cur_image;
1174 struct module *mod;
1175 };
1176
1177 struct bpf_attach_target_info {
1178 struct btf_func_model fmodel;
1179 long tgt_addr;
1180 struct module *tgt_mod;
1181 const char *tgt_name;
1182 const struct btf_type *tgt_type;
1183 };
1184
1185 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1186
1187 struct bpf_dispatcher_prog {
1188 struct bpf_prog *prog;
1189 refcount_t users;
1190 };
1191
1192 struct bpf_dispatcher {
1193 /* dispatcher mutex */
1194 struct mutex mutex;
1195 void *func;
1196 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1197 int num_progs;
1198 void *image;
1199 void *rw_image;
1200 u32 image_off;
1201 struct bpf_ksym ksym;
1202 #ifdef CONFIG_HAVE_STATIC_CALL
1203 struct static_call_key *sc_key;
1204 void *sc_tramp;
1205 #endif
1206 };
1207
bpf_dispatcher_nop_func(const void * ctx,const struct bpf_insn * insnsi,bpf_func_t bpf_func)1208 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
1209 const void *ctx,
1210 const struct bpf_insn *insnsi,
1211 bpf_func_t bpf_func)
1212 {
1213 return bpf_func(ctx, insnsi);
1214 }
1215
1216 /* the implementation of the opaque uapi struct bpf_dynptr */
1217 struct bpf_dynptr_kern {
1218 void *data;
1219 /* Size represents the number of usable bytes of dynptr data.
1220 * If for example the offset is at 4 for a local dynptr whose data is
1221 * of type u64, the number of usable bytes is 4.
1222 *
1223 * The upper 8 bits are reserved. It is as follows:
1224 * Bits 0 - 23 = size
1225 * Bits 24 - 30 = dynptr type
1226 * Bit 31 = whether dynptr is read-only
1227 */
1228 u32 size;
1229 u32 offset;
1230 } __aligned(8);
1231
1232 enum bpf_dynptr_type {
1233 BPF_DYNPTR_TYPE_INVALID,
1234 /* Points to memory that is local to the bpf program */
1235 BPF_DYNPTR_TYPE_LOCAL,
1236 /* Underlying data is a ringbuf record */
1237 BPF_DYNPTR_TYPE_RINGBUF,
1238 /* Underlying data is a sk_buff */
1239 BPF_DYNPTR_TYPE_SKB,
1240 /* Underlying data is a xdp_buff */
1241 BPF_DYNPTR_TYPE_XDP,
1242 };
1243
1244 int bpf_dynptr_check_size(u32 size);
1245 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1246
1247 #ifdef CONFIG_BPF_JIT
1248 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1249 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1250 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1251 struct bpf_attach_target_info *tgt_info);
1252 void bpf_trampoline_put(struct bpf_trampoline *tr);
1253 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1254
1255 /*
1256 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1257 * indirection with a direct call to the bpf program. If the architecture does
1258 * not have STATIC_CALL, avoid a double-indirection.
1259 */
1260 #ifdef CONFIG_HAVE_STATIC_CALL
1261
1262 #define __BPF_DISPATCHER_SC_INIT(_name) \
1263 .sc_key = &STATIC_CALL_KEY(_name), \
1264 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1265
1266 #define __BPF_DISPATCHER_SC(name) \
1267 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1268
1269 #define __BPF_DISPATCHER_CALL(name) \
1270 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1271
1272 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1273 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1274
1275 #else
1276 #define __BPF_DISPATCHER_SC_INIT(name)
1277 #define __BPF_DISPATCHER_SC(name)
1278 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1279 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1280 #endif
1281
1282 #define BPF_DISPATCHER_INIT(_name) { \
1283 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1284 .func = &_name##_func, \
1285 .progs = {}, \
1286 .num_progs = 0, \
1287 .image = NULL, \
1288 .image_off = 0, \
1289 .ksym = { \
1290 .name = #_name, \
1291 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1292 }, \
1293 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1294 }
1295
1296 #define DEFINE_BPF_DISPATCHER(name) \
1297 __BPF_DISPATCHER_SC(name); \
1298 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
1299 const void *ctx, \
1300 const struct bpf_insn *insnsi, \
1301 bpf_func_t bpf_func) \
1302 { \
1303 return __BPF_DISPATCHER_CALL(name); \
1304 } \
1305 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1306 struct bpf_dispatcher bpf_dispatcher_##name = \
1307 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1308
1309 #define DECLARE_BPF_DISPATCHER(name) \
1310 unsigned int bpf_dispatcher_##name##_func( \
1311 const void *ctx, \
1312 const struct bpf_insn *insnsi, \
1313 bpf_func_t bpf_func); \
1314 extern struct bpf_dispatcher bpf_dispatcher_##name;
1315
1316 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1317 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1318 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1319 struct bpf_prog *to);
1320 /* Called only from JIT-enabled code, so there's no need for stubs. */
1321 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
1322 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1323 void bpf_ksym_add(struct bpf_ksym *ksym);
1324 void bpf_ksym_del(struct bpf_ksym *ksym);
1325 int bpf_jit_charge_modmem(u32 size);
1326 void bpf_jit_uncharge_modmem(u32 size);
1327 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1328 #else
bpf_trampoline_link_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1329 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1330 struct bpf_trampoline *tr)
1331 {
1332 return -ENOTSUPP;
1333 }
bpf_trampoline_unlink_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1334 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1335 struct bpf_trampoline *tr)
1336 {
1337 return -ENOTSUPP;
1338 }
bpf_trampoline_get(u64 key,struct bpf_attach_target_info * tgt_info)1339 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1340 struct bpf_attach_target_info *tgt_info)
1341 {
1342 return NULL;
1343 }
bpf_trampoline_put(struct bpf_trampoline * tr)1344 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1345 #define DEFINE_BPF_DISPATCHER(name)
1346 #define DECLARE_BPF_DISPATCHER(name)
1347 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1348 #define BPF_DISPATCHER_PTR(name) NULL
bpf_dispatcher_change_prog(struct bpf_dispatcher * d,struct bpf_prog * from,struct bpf_prog * to)1349 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1350 struct bpf_prog *from,
1351 struct bpf_prog *to) {}
is_bpf_image_address(unsigned long address)1352 static inline bool is_bpf_image_address(unsigned long address)
1353 {
1354 return false;
1355 }
bpf_prog_has_trampoline(const struct bpf_prog * prog)1356 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1357 {
1358 return false;
1359 }
1360 #endif
1361
1362 struct bpf_func_info_aux {
1363 u16 linkage;
1364 bool unreliable;
1365 };
1366
1367 enum bpf_jit_poke_reason {
1368 BPF_POKE_REASON_TAIL_CALL,
1369 };
1370
1371 /* Descriptor of pokes pointing /into/ the JITed image. */
1372 struct bpf_jit_poke_descriptor {
1373 void *tailcall_target;
1374 void *tailcall_bypass;
1375 void *bypass_addr;
1376 void *aux;
1377 union {
1378 struct {
1379 struct bpf_map *map;
1380 u32 key;
1381 } tail_call;
1382 };
1383 bool tailcall_target_stable;
1384 u8 adj_off;
1385 u16 reason;
1386 u32 insn_idx;
1387 };
1388
1389 /* reg_type info for ctx arguments */
1390 struct bpf_ctx_arg_aux {
1391 u32 offset;
1392 enum bpf_reg_type reg_type;
1393 u32 btf_id;
1394 };
1395
1396 struct btf_mod_pair {
1397 struct btf *btf;
1398 struct module *module;
1399 };
1400
1401 struct bpf_kfunc_desc_tab;
1402
1403 struct bpf_prog_aux {
1404 atomic64_t refcnt;
1405 u32 used_map_cnt;
1406 u32 used_btf_cnt;
1407 u32 max_ctx_offset;
1408 u32 max_pkt_offset;
1409 u32 max_tp_access;
1410 u32 stack_depth;
1411 u32 id;
1412 u32 func_cnt; /* used by non-func prog as the number of func progs */
1413 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1414 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1415 u32 ctx_arg_info_size;
1416 u32 max_rdonly_access;
1417 u32 max_rdwr_access;
1418 struct btf *attach_btf;
1419 const struct bpf_ctx_arg_aux *ctx_arg_info;
1420 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1421 struct bpf_prog *dst_prog;
1422 struct bpf_trampoline *dst_trampoline;
1423 enum bpf_prog_type saved_dst_prog_type;
1424 enum bpf_attach_type saved_dst_attach_type;
1425 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1426 bool dev_bound; /* Program is bound to the netdev. */
1427 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1428 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1429 bool func_proto_unreliable;
1430 bool sleepable;
1431 bool tail_call_reachable;
1432 bool xdp_has_frags;
1433 bool changes_pkt_data;
1434 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1435 const struct btf_type *attach_func_proto;
1436 /* function name for valid attach_btf_id */
1437 const char *attach_func_name;
1438 struct bpf_prog **func;
1439 void *jit_data; /* JIT specific data. arch dependent */
1440 struct bpf_jit_poke_descriptor *poke_tab;
1441 struct bpf_kfunc_desc_tab *kfunc_tab;
1442 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1443 u32 size_poke_tab;
1444 struct bpf_ksym ksym;
1445 const struct bpf_prog_ops *ops;
1446 struct bpf_map **used_maps;
1447 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1448 struct btf_mod_pair *used_btfs;
1449 struct bpf_prog *prog;
1450 struct user_struct *user;
1451 u64 load_time; /* ns since boottime */
1452 u32 verified_insns;
1453 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1454 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1455 char name[BPF_OBJ_NAME_LEN];
1456 #ifdef CONFIG_SECURITY
1457 void *security;
1458 #endif
1459 struct bpf_prog_offload *offload;
1460 struct btf *btf;
1461 struct bpf_func_info *func_info;
1462 struct bpf_func_info_aux *func_info_aux;
1463 /* bpf_line_info loaded from userspace. linfo->insn_off
1464 * has the xlated insn offset.
1465 * Both the main and sub prog share the same linfo.
1466 * The subprog can access its first linfo by
1467 * using the linfo_idx.
1468 */
1469 struct bpf_line_info *linfo;
1470 /* jited_linfo is the jited addr of the linfo. It has a
1471 * one to one mapping to linfo:
1472 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1473 * Both the main and sub prog share the same jited_linfo.
1474 * The subprog can access its first jited_linfo by
1475 * using the linfo_idx.
1476 */
1477 void **jited_linfo;
1478 u32 func_info_cnt;
1479 u32 nr_linfo;
1480 /* subprog can use linfo_idx to access its first linfo and
1481 * jited_linfo.
1482 * main prog always has linfo_idx == 0
1483 */
1484 u32 linfo_idx;
1485 struct module *mod;
1486 u32 num_exentries;
1487 struct exception_table_entry *extable;
1488 union {
1489 struct work_struct work;
1490 struct rcu_head rcu;
1491 };
1492 };
1493
1494 struct bpf_prog {
1495 u16 pages; /* Number of allocated pages */
1496 u16 jited:1, /* Is our filter JIT'ed? */
1497 jit_requested:1,/* archs need to JIT the prog */
1498 gpl_compatible:1, /* Is filter GPL compatible? */
1499 cb_access:1, /* Is control block accessed? */
1500 dst_needed:1, /* Do we need dst entry? */
1501 blinding_requested:1, /* needs constant blinding */
1502 blinded:1, /* Was blinded */
1503 is_func:1, /* program is a bpf function */
1504 kprobe_override:1, /* Do we override a kprobe? */
1505 has_callchain_buf:1, /* callchain buffer allocated? */
1506 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1507 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1508 call_get_func_ip:1, /* Do we call get_func_ip() */
1509 tstamp_type_access:1; /* Accessed __sk_buff->tstamp_type */
1510 enum bpf_prog_type type; /* Type of BPF program */
1511 enum bpf_attach_type expected_attach_type; /* For some prog types */
1512 u32 len; /* Number of filter blocks */
1513 u32 jited_len; /* Size of jited insns in bytes */
1514 u8 tag[BPF_TAG_SIZE];
1515 struct bpf_prog_stats __percpu *stats;
1516 int __percpu *active;
1517 unsigned int (*bpf_func)(const void *ctx,
1518 const struct bpf_insn *insn);
1519 struct bpf_prog_aux *aux; /* Auxiliary fields */
1520 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1521 /* Instructions for interpreter */
1522 union {
1523 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1524 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1525 };
1526 };
1527
1528 struct bpf_array_aux {
1529 /* Programs with direct jumps into programs part of this array. */
1530 struct list_head poke_progs;
1531 struct bpf_map *map;
1532 struct mutex poke_mutex;
1533 struct work_struct work;
1534 };
1535
1536 struct bpf_link {
1537 atomic64_t refcnt;
1538 u32 id;
1539 enum bpf_link_type type;
1540 const struct bpf_link_ops *ops;
1541 struct bpf_prog *prog;
1542 /* rcu is used before freeing, work can be used to schedule that
1543 * RCU-based freeing before that, so they never overlap
1544 */
1545 union {
1546 struct rcu_head rcu;
1547 struct work_struct work;
1548 };
1549 };
1550
1551 struct bpf_link_ops {
1552 void (*release)(struct bpf_link *link);
1553 /* deallocate link resources callback, called without RCU grace period
1554 * waiting
1555 */
1556 void (*dealloc)(struct bpf_link *link);
1557 /* deallocate link resources callback, called after RCU grace period;
1558 * if underlying BPF program is sleepable we go through tasks trace
1559 * RCU GP and then "classic" RCU GP
1560 */
1561 void (*dealloc_deferred)(struct bpf_link *link);
1562 int (*detach)(struct bpf_link *link);
1563 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1564 struct bpf_prog *old_prog);
1565 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1566 int (*fill_link_info)(const struct bpf_link *link,
1567 struct bpf_link_info *info);
1568 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1569 struct bpf_map *old_map);
1570 };
1571
1572 struct bpf_tramp_link {
1573 struct bpf_link link;
1574 struct hlist_node tramp_hlist;
1575 u64 cookie;
1576 };
1577
1578 struct bpf_shim_tramp_link {
1579 struct bpf_tramp_link link;
1580 struct bpf_trampoline *trampoline;
1581 };
1582
1583 struct bpf_tracing_link {
1584 struct bpf_tramp_link link;
1585 enum bpf_attach_type attach_type;
1586 struct bpf_trampoline *trampoline;
1587 struct bpf_prog *tgt_prog;
1588 };
1589
1590 struct bpf_link_primer {
1591 struct bpf_link *link;
1592 struct file *file;
1593 int fd;
1594 u32 id;
1595 };
1596
1597 struct bpf_struct_ops_value;
1598 struct btf_member;
1599
1600 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1601 /**
1602 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1603 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1604 * of BPF_PROG_TYPE_STRUCT_OPS progs.
1605 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1606 * when determining whether the struct_ops progs in the
1607 * struct_ops map are valid.
1608 * @init: A callback that is invoked a single time, and before any other
1609 * callback, to initialize the structure. A nonzero return value means
1610 * the subsystem could not be initialized.
1611 * @check_member: When defined, a callback invoked by the verifier to allow
1612 * the subsystem to determine if an entry in the struct_ops map
1613 * is valid. A nonzero return value means that the map is
1614 * invalid and should be rejected by the verifier.
1615 * @init_member: A callback that is invoked for each member of the struct_ops
1616 * map to allow the subsystem to initialize the member. A nonzero
1617 * value means the member could not be initialized. This callback
1618 * is exclusive with the @type, @type_id, @value_type, and
1619 * @value_id fields.
1620 * @reg: A callback that is invoked when the struct_ops map has been
1621 * initialized and is being attached to. Zero means the struct_ops map
1622 * has been successfully registered and is live. A nonzero return value
1623 * means the struct_ops map could not be registered.
1624 * @unreg: A callback that is invoked when the struct_ops map should be
1625 * unregistered.
1626 * @update: A callback that is invoked when the live struct_ops map is being
1627 * updated to contain new values. This callback is only invoked when
1628 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1629 * it is assumed that the struct_ops map cannot be updated.
1630 * @validate: A callback that is invoked after all of the members have been
1631 * initialized. This callback should perform static checks on the
1632 * map, meaning that it should either fail or succeed
1633 * deterministically. A struct_ops map that has been validated may
1634 * not necessarily succeed in being registered if the call to @reg
1635 * fails. For example, a valid struct_ops map may be loaded, but
1636 * then fail to be registered due to there being another active
1637 * struct_ops map on the system in the subsystem already. For this
1638 * reason, if this callback is not defined, the check is skipped as
1639 * the struct_ops map will have final verification performed in
1640 * @reg.
1641 * @type: BTF type.
1642 * @value_type: Value type.
1643 * @name: The name of the struct bpf_struct_ops object.
1644 * @func_models: Func models
1645 * @type_id: BTF type id.
1646 * @value_id: BTF value id.
1647 */
1648 struct bpf_struct_ops {
1649 const struct bpf_verifier_ops *verifier_ops;
1650 int (*init)(struct btf *btf);
1651 int (*check_member)(const struct btf_type *t,
1652 const struct btf_member *member,
1653 const struct bpf_prog *prog);
1654 int (*init_member)(const struct btf_type *t,
1655 const struct btf_member *member,
1656 void *kdata, const void *udata);
1657 int (*reg)(void *kdata);
1658 void (*unreg)(void *kdata);
1659 int (*update)(void *kdata, void *old_kdata);
1660 int (*validate)(void *kdata);
1661 const struct btf_type *type;
1662 const struct btf_type *value_type;
1663 const char *name;
1664 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1665 u32 type_id;
1666 u32 value_id;
1667 };
1668
1669 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1670 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1671 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1672 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1673 bool bpf_struct_ops_get(const void *kdata);
1674 void bpf_struct_ops_put(const void *kdata);
1675 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1676 void *value);
1677 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1678 struct bpf_tramp_link *link,
1679 const struct btf_func_model *model,
1680 void *image, void *image_end);
bpf_try_module_get(const void * data,struct module * owner)1681 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1682 {
1683 if (owner == BPF_MODULE_OWNER)
1684 return bpf_struct_ops_get(data);
1685 else
1686 return try_module_get(owner);
1687 }
bpf_module_put(const void * data,struct module * owner)1688 static inline void bpf_module_put(const void *data, struct module *owner)
1689 {
1690 if (owner == BPF_MODULE_OWNER)
1691 bpf_struct_ops_put(data);
1692 else
1693 module_put(owner);
1694 }
1695 int bpf_struct_ops_link_create(union bpf_attr *attr);
1696
1697 #ifdef CONFIG_NET
1698 /* Define it here to avoid the use of forward declaration */
1699 struct bpf_dummy_ops_state {
1700 int val;
1701 };
1702
1703 struct bpf_dummy_ops {
1704 int (*test_1)(struct bpf_dummy_ops_state *cb);
1705 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1706 char a3, unsigned long a4);
1707 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1708 };
1709
1710 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1711 union bpf_attr __user *uattr);
1712 #endif
1713 #else
bpf_struct_ops_find(u32 type_id)1714 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1715 {
1716 return NULL;
1717 }
bpf_struct_ops_init(struct btf * btf,struct bpf_verifier_log * log)1718 static inline void bpf_struct_ops_init(struct btf *btf,
1719 struct bpf_verifier_log *log)
1720 {
1721 }
bpf_try_module_get(const void * data,struct module * owner)1722 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1723 {
1724 return try_module_get(owner);
1725 }
bpf_module_put(const void * data,struct module * owner)1726 static inline void bpf_module_put(const void *data, struct module *owner)
1727 {
1728 module_put(owner);
1729 }
bpf_struct_ops_map_sys_lookup_elem(struct bpf_map * map,void * key,void * value)1730 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1731 void *key,
1732 void *value)
1733 {
1734 return -EINVAL;
1735 }
bpf_struct_ops_link_create(union bpf_attr * attr)1736 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1737 {
1738 return -EOPNOTSUPP;
1739 }
1740
1741 #endif
1742
1743 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1744 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1745 int cgroup_atype);
1746 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1747 #else
bpf_trampoline_link_cgroup_shim(struct bpf_prog * prog,int cgroup_atype)1748 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1749 int cgroup_atype)
1750 {
1751 return -EOPNOTSUPP;
1752 }
bpf_trampoline_unlink_cgroup_shim(struct bpf_prog * prog)1753 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1754 {
1755 }
1756 #endif
1757
1758 struct bpf_array {
1759 struct bpf_map map;
1760 u32 elem_size;
1761 u32 index_mask;
1762 struct bpf_array_aux *aux;
1763 union {
1764 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1765 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1766 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1767 };
1768 };
1769
1770 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1771 #define MAX_TAIL_CALL_CNT 33
1772
1773 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1774 * It's enum to expose it (and thus make it discoverable) through BTF.
1775 */
1776 enum {
1777 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1778 };
1779
1780 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1781 BPF_F_RDONLY_PROG | \
1782 BPF_F_WRONLY | \
1783 BPF_F_WRONLY_PROG)
1784
1785 #define BPF_MAP_CAN_READ BIT(0)
1786 #define BPF_MAP_CAN_WRITE BIT(1)
1787
1788 /* Maximum number of user-producer ring buffer samples that can be drained in
1789 * a call to bpf_user_ringbuf_drain().
1790 */
1791 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1792
bpf_map_flags_to_cap(struct bpf_map * map)1793 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1794 {
1795 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1796
1797 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1798 * not possible.
1799 */
1800 if (access_flags & BPF_F_RDONLY_PROG)
1801 return BPF_MAP_CAN_READ;
1802 else if (access_flags & BPF_F_WRONLY_PROG)
1803 return BPF_MAP_CAN_WRITE;
1804 else
1805 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1806 }
1807
bpf_map_flags_access_ok(u32 access_flags)1808 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1809 {
1810 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1811 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1812 }
1813
1814 struct bpf_event_entry {
1815 struct perf_event *event;
1816 struct file *perf_file;
1817 struct file *map_file;
1818 struct rcu_head rcu;
1819 };
1820
map_type_contains_progs(struct bpf_map * map)1821 static inline bool map_type_contains_progs(struct bpf_map *map)
1822 {
1823 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1824 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1825 map->map_type == BPF_MAP_TYPE_CPUMAP;
1826 }
1827
1828 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1829 int bpf_prog_calc_tag(struct bpf_prog *fp);
1830
1831 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1832 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1833
1834 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1835 unsigned long off, unsigned long len);
1836 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1837 const struct bpf_insn *src,
1838 struct bpf_insn *dst,
1839 struct bpf_prog *prog,
1840 u32 *target_size);
1841
1842 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1843 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1844
1845 /* an array of programs to be executed under rcu_lock.
1846 *
1847 * Typical usage:
1848 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
1849 *
1850 * the structure returned by bpf_prog_array_alloc() should be populated
1851 * with program pointers and the last pointer must be NULL.
1852 * The user has to keep refcnt on the program and make sure the program
1853 * is removed from the array before bpf_prog_put().
1854 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1855 * since other cpus are walking the array of pointers in parallel.
1856 */
1857 struct bpf_prog_array_item {
1858 struct bpf_prog *prog;
1859 union {
1860 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1861 u64 bpf_cookie;
1862 };
1863 };
1864
1865 struct bpf_prog_array {
1866 struct rcu_head rcu;
1867 struct bpf_prog_array_item items[];
1868 };
1869
1870 struct bpf_empty_prog_array {
1871 struct bpf_prog_array hdr;
1872 struct bpf_prog *null_prog;
1873 };
1874
1875 /* to avoid allocating empty bpf_prog_array for cgroups that
1876 * don't have bpf program attached use one global 'bpf_empty_prog_array'
1877 * It will not be modified the caller of bpf_prog_array_alloc()
1878 * (since caller requested prog_cnt == 0)
1879 * that pointer should be 'freed' by bpf_prog_array_free()
1880 */
1881 extern struct bpf_empty_prog_array bpf_empty_prog_array;
1882
1883 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1884 void bpf_prog_array_free(struct bpf_prog_array *progs);
1885 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
1886 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
1887 int bpf_prog_array_length(struct bpf_prog_array *progs);
1888 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1889 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1890 __u32 __user *prog_ids, u32 cnt);
1891
1892 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1893 struct bpf_prog *old_prog);
1894 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1895 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1896 struct bpf_prog *prog);
1897 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1898 u32 *prog_ids, u32 request_cnt,
1899 u32 *prog_cnt);
1900 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1901 struct bpf_prog *exclude_prog,
1902 struct bpf_prog *include_prog,
1903 u64 bpf_cookie,
1904 struct bpf_prog_array **new_array);
1905
1906 struct bpf_run_ctx {};
1907
1908 struct bpf_cg_run_ctx {
1909 struct bpf_run_ctx run_ctx;
1910 const struct bpf_prog_array_item *prog_item;
1911 int retval;
1912 };
1913
1914 struct bpf_trace_run_ctx {
1915 struct bpf_run_ctx run_ctx;
1916 u64 bpf_cookie;
1917 bool is_uprobe;
1918 };
1919
1920 struct bpf_tramp_run_ctx {
1921 struct bpf_run_ctx run_ctx;
1922 u64 bpf_cookie;
1923 struct bpf_run_ctx *saved_run_ctx;
1924 };
1925
bpf_set_run_ctx(struct bpf_run_ctx * new_ctx)1926 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1927 {
1928 struct bpf_run_ctx *old_ctx = NULL;
1929
1930 #ifdef CONFIG_BPF_SYSCALL
1931 old_ctx = current->bpf_ctx;
1932 current->bpf_ctx = new_ctx;
1933 #endif
1934 return old_ctx;
1935 }
1936
bpf_reset_run_ctx(struct bpf_run_ctx * old_ctx)1937 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1938 {
1939 #ifdef CONFIG_BPF_SYSCALL
1940 current->bpf_ctx = old_ctx;
1941 #endif
1942 }
1943
1944 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1945 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1946 /* BPF program asks to set CN on the packet. */
1947 #define BPF_RET_SET_CN (1 << 0)
1948
1949 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1950
1951 static __always_inline u32
bpf_prog_run_array(const struct bpf_prog_array * array,const void * ctx,bpf_prog_run_fn run_prog)1952 bpf_prog_run_array(const struct bpf_prog_array *array,
1953 const void *ctx, bpf_prog_run_fn run_prog)
1954 {
1955 const struct bpf_prog_array_item *item;
1956 const struct bpf_prog *prog;
1957 struct bpf_run_ctx *old_run_ctx;
1958 struct bpf_trace_run_ctx run_ctx;
1959 u32 ret = 1;
1960
1961 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
1962
1963 if (unlikely(!array))
1964 return ret;
1965
1966 run_ctx.is_uprobe = false;
1967
1968 migrate_disable();
1969 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1970 item = &array->items[0];
1971 while ((prog = READ_ONCE(item->prog))) {
1972 run_ctx.bpf_cookie = item->bpf_cookie;
1973 ret &= run_prog(prog, ctx);
1974 item++;
1975 }
1976 bpf_reset_run_ctx(old_run_ctx);
1977 migrate_enable();
1978 return ret;
1979 }
1980
1981 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
1982 *
1983 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
1984 * overall. As a result, we must use the bpf_prog_array_free_sleepable
1985 * in order to use the tasks_trace rcu grace period.
1986 *
1987 * When a non-sleepable program is inside the array, we take the rcu read
1988 * section and disable preemption for that program alone, so it can access
1989 * rcu-protected dynamically sized maps.
1990 */
1991 static __always_inline u32
bpf_prog_run_array_uprobe(const struct bpf_prog_array * array,const void * ctx,bpf_prog_run_fn run_prog)1992 bpf_prog_run_array_uprobe(const struct bpf_prog_array *array,
1993 const void *ctx, bpf_prog_run_fn run_prog)
1994 {
1995 const struct bpf_prog_array_item *item;
1996 const struct bpf_prog *prog;
1997 struct bpf_run_ctx *old_run_ctx;
1998 struct bpf_trace_run_ctx run_ctx;
1999 u32 ret = 1;
2000
2001 might_fault();
2002 RCU_LOCKDEP_WARN(!rcu_read_lock_trace_held(), "no rcu lock held");
2003
2004 if (unlikely(!array))
2005 return ret;
2006
2007 migrate_disable();
2008
2009 run_ctx.is_uprobe = true;
2010
2011 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2012 item = &array->items[0];
2013 while ((prog = READ_ONCE(item->prog))) {
2014 if (!prog->aux->sleepable)
2015 rcu_read_lock();
2016
2017 run_ctx.bpf_cookie = item->bpf_cookie;
2018 ret &= run_prog(prog, ctx);
2019 item++;
2020
2021 if (!prog->aux->sleepable)
2022 rcu_read_unlock();
2023 }
2024 bpf_reset_run_ctx(old_run_ctx);
2025 migrate_enable();
2026 return ret;
2027 }
2028
2029 #ifdef CONFIG_BPF_SYSCALL
2030 DECLARE_PER_CPU(int, bpf_prog_active);
2031 extern struct mutex bpf_stats_enabled_mutex;
2032
2033 /*
2034 * Block execution of BPF programs attached to instrumentation (perf,
2035 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2036 * these events can happen inside a region which holds a map bucket lock
2037 * and can deadlock on it.
2038 */
bpf_disable_instrumentation(void)2039 static inline void bpf_disable_instrumentation(void)
2040 {
2041 migrate_disable();
2042 this_cpu_inc(bpf_prog_active);
2043 }
2044
bpf_enable_instrumentation(void)2045 static inline void bpf_enable_instrumentation(void)
2046 {
2047 this_cpu_dec(bpf_prog_active);
2048 migrate_enable();
2049 }
2050
2051 extern const struct file_operations bpf_map_fops;
2052 extern const struct file_operations bpf_prog_fops;
2053 extern const struct file_operations bpf_iter_fops;
2054
2055 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2056 extern const struct bpf_prog_ops _name ## _prog_ops; \
2057 extern const struct bpf_verifier_ops _name ## _verifier_ops;
2058 #define BPF_MAP_TYPE(_id, _ops) \
2059 extern const struct bpf_map_ops _ops;
2060 #define BPF_LINK_TYPE(_id, _name)
2061 #include <linux/bpf_types.h>
2062 #undef BPF_PROG_TYPE
2063 #undef BPF_MAP_TYPE
2064 #undef BPF_LINK_TYPE
2065
2066 extern const struct bpf_prog_ops bpf_offload_prog_ops;
2067 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2068 extern const struct bpf_verifier_ops xdp_analyzer_ops;
2069
2070 struct bpf_prog *bpf_prog_get(u32 ufd);
2071 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2072 bool attach_drv);
2073 void bpf_prog_add(struct bpf_prog *prog, int i);
2074 void bpf_prog_sub(struct bpf_prog *prog, int i);
2075 void bpf_prog_inc(struct bpf_prog *prog);
2076 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2077 void bpf_prog_put(struct bpf_prog *prog);
2078
2079 void bpf_prog_free_id(struct bpf_prog *prog);
2080 void bpf_map_free_id(struct bpf_map *map);
2081
2082 struct btf_field *btf_record_find(const struct btf_record *rec,
2083 u32 offset, u32 field_mask);
2084 void btf_record_free(struct btf_record *rec);
2085 void bpf_map_free_record(struct bpf_map *map);
2086 struct btf_record *btf_record_dup(const struct btf_record *rec);
2087 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2088 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2089 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2090
2091 struct bpf_map *bpf_map_get(u32 ufd);
2092 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2093 struct bpf_map *__bpf_map_get(struct fd f);
2094 void bpf_map_inc(struct bpf_map *map);
2095 void bpf_map_inc_with_uref(struct bpf_map *map);
2096 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2097 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2098 void bpf_map_put_with_uref(struct bpf_map *map);
2099 void bpf_map_put(struct bpf_map *map);
2100 void *bpf_map_area_alloc(u64 size, int numa_node);
2101 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2102 void bpf_map_area_free(void *base);
2103 bool bpf_map_write_active(const struct bpf_map *map);
2104 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2105 int generic_map_lookup_batch(struct bpf_map *map,
2106 const union bpf_attr *attr,
2107 union bpf_attr __user *uattr);
2108 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2109 const union bpf_attr *attr,
2110 union bpf_attr __user *uattr);
2111 int generic_map_delete_batch(struct bpf_map *map,
2112 const union bpf_attr *attr,
2113 union bpf_attr __user *uattr);
2114 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2115 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2116
2117 #ifdef CONFIG_MEMCG_KMEM
2118 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2119 int node);
2120 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2121 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2122 gfp_t flags);
2123 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2124 size_t align, gfp_t flags);
2125 #else
2126 static inline void *
bpf_map_kmalloc_node(const struct bpf_map * map,size_t size,gfp_t flags,int node)2127 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2128 int node)
2129 {
2130 return kmalloc_node(size, flags, node);
2131 }
2132
2133 static inline void *
bpf_map_kzalloc(const struct bpf_map * map,size_t size,gfp_t flags)2134 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
2135 {
2136 return kzalloc(size, flags);
2137 }
2138
2139 static inline void *
bpf_map_kvcalloc(struct bpf_map * map,size_t n,size_t size,gfp_t flags)2140 bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
2141 {
2142 return kvcalloc(n, size, flags);
2143 }
2144
2145 static inline void __percpu *
bpf_map_alloc_percpu(const struct bpf_map * map,size_t size,size_t align,gfp_t flags)2146 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
2147 gfp_t flags)
2148 {
2149 return __alloc_percpu_gfp(size, align, flags);
2150 }
2151 #endif
2152
2153 static inline int
bpf_map_init_elem_count(struct bpf_map * map)2154 bpf_map_init_elem_count(struct bpf_map *map)
2155 {
2156 size_t size = sizeof(*map->elem_count), align = size;
2157 gfp_t flags = GFP_USER | __GFP_NOWARN;
2158
2159 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2160 if (!map->elem_count)
2161 return -ENOMEM;
2162
2163 return 0;
2164 }
2165
2166 static inline void
bpf_map_free_elem_count(struct bpf_map * map)2167 bpf_map_free_elem_count(struct bpf_map *map)
2168 {
2169 free_percpu(map->elem_count);
2170 }
2171
bpf_map_inc_elem_count(struct bpf_map * map)2172 static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2173 {
2174 this_cpu_inc(*map->elem_count);
2175 }
2176
bpf_map_dec_elem_count(struct bpf_map * map)2177 static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2178 {
2179 this_cpu_dec(*map->elem_count);
2180 }
2181
2182 extern int sysctl_unprivileged_bpf_disabled;
2183
bpf_allow_ptr_leaks(void)2184 static inline bool bpf_allow_ptr_leaks(void)
2185 {
2186 return perfmon_capable();
2187 }
2188
bpf_allow_uninit_stack(void)2189 static inline bool bpf_allow_uninit_stack(void)
2190 {
2191 return perfmon_capable();
2192 }
2193
bpf_bypass_spec_v1(void)2194 static inline bool bpf_bypass_spec_v1(void)
2195 {
2196 return perfmon_capable();
2197 }
2198
bpf_bypass_spec_v4(void)2199 static inline bool bpf_bypass_spec_v4(void)
2200 {
2201 return perfmon_capable();
2202 }
2203
2204 int bpf_map_new_fd(struct bpf_map *map, int flags);
2205 int bpf_prog_new_fd(struct bpf_prog *prog);
2206
2207 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2208 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2209 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2210 int bpf_link_settle(struct bpf_link_primer *primer);
2211 void bpf_link_cleanup(struct bpf_link_primer *primer);
2212 void bpf_link_inc(struct bpf_link *link);
2213 void bpf_link_put(struct bpf_link *link);
2214 int bpf_link_new_fd(struct bpf_link *link);
2215 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2216 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2217
2218 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2219 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2220
2221 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2222 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2223 extern int bpf_iter_ ## target(args); \
2224 int __init bpf_iter_ ## target(args) { return 0; }
2225
2226 /*
2227 * The task type of iterators.
2228 *
2229 * For BPF task iterators, they can be parameterized with various
2230 * parameters to visit only some of tasks.
2231 *
2232 * BPF_TASK_ITER_ALL (default)
2233 * Iterate over resources of every task.
2234 *
2235 * BPF_TASK_ITER_TID
2236 * Iterate over resources of a task/tid.
2237 *
2238 * BPF_TASK_ITER_TGID
2239 * Iterate over resources of every task of a process / task group.
2240 */
2241 enum bpf_iter_task_type {
2242 BPF_TASK_ITER_ALL = 0,
2243 BPF_TASK_ITER_TID,
2244 BPF_TASK_ITER_TGID,
2245 };
2246
2247 struct bpf_iter_aux_info {
2248 /* for map_elem iter */
2249 struct bpf_map *map;
2250
2251 /* for cgroup iter */
2252 struct {
2253 struct cgroup *start; /* starting cgroup */
2254 enum bpf_cgroup_iter_order order;
2255 } cgroup;
2256 struct {
2257 enum bpf_iter_task_type type;
2258 u32 pid;
2259 } task;
2260 };
2261
2262 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2263 union bpf_iter_link_info *linfo,
2264 struct bpf_iter_aux_info *aux);
2265 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2266 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2267 struct seq_file *seq);
2268 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2269 struct bpf_link_info *info);
2270 typedef const struct bpf_func_proto *
2271 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2272 const struct bpf_prog *prog);
2273
2274 enum bpf_iter_feature {
2275 BPF_ITER_RESCHED = BIT(0),
2276 };
2277
2278 #define BPF_ITER_CTX_ARG_MAX 2
2279 struct bpf_iter_reg {
2280 const char *target;
2281 bpf_iter_attach_target_t attach_target;
2282 bpf_iter_detach_target_t detach_target;
2283 bpf_iter_show_fdinfo_t show_fdinfo;
2284 bpf_iter_fill_link_info_t fill_link_info;
2285 bpf_iter_get_func_proto_t get_func_proto;
2286 u32 ctx_arg_info_size;
2287 u32 feature;
2288 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2289 const struct bpf_iter_seq_info *seq_info;
2290 };
2291
2292 struct bpf_iter_meta {
2293 __bpf_md_ptr(struct seq_file *, seq);
2294 u64 session_id;
2295 u64 seq_num;
2296 };
2297
2298 struct bpf_iter__bpf_map_elem {
2299 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2300 __bpf_md_ptr(struct bpf_map *, map);
2301 __bpf_md_ptr(void *, key);
2302 __bpf_md_ptr(void *, value);
2303 };
2304
2305 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2306 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2307 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2308 const struct bpf_func_proto *
2309 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2310 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2311 int bpf_iter_new_fd(struct bpf_link *link);
2312 bool bpf_link_is_iter(struct bpf_link *link);
2313 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2314 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2315 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2316 struct seq_file *seq);
2317 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2318 struct bpf_link_info *info);
2319
2320 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2321 struct bpf_func_state *caller,
2322 struct bpf_func_state *callee);
2323
2324 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2325 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2326 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2327 u64 flags);
2328 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2329 u64 flags);
2330
2331 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2332
2333 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2334 void *key, void *value, u64 map_flags);
2335 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2336 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2337 void *key, void *value, u64 map_flags);
2338 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2339
2340 int bpf_get_file_flag(int flags);
2341 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2342 size_t actual_size);
2343
2344 /* verify correctness of eBPF program */
2345 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2346
2347 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2348 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2349 #endif
2350
2351 struct btf *bpf_get_btf_vmlinux(void);
2352
2353 /* Map specifics */
2354 struct xdp_frame;
2355 struct sk_buff;
2356 struct bpf_dtab_netdev;
2357 struct bpf_cpu_map_entry;
2358
2359 void __dev_flush(void);
2360 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2361 struct net_device *dev_rx);
2362 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2363 struct net_device *dev_rx);
2364 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2365 struct bpf_map *map, bool exclude_ingress);
2366 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2367 struct bpf_prog *xdp_prog);
2368 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2369 struct bpf_prog *xdp_prog, struct bpf_map *map,
2370 bool exclude_ingress);
2371
2372 void __cpu_map_flush(void);
2373 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2374 struct net_device *dev_rx);
2375 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2376 struct sk_buff *skb);
2377
2378 /* Return map's numa specified by userspace */
bpf_map_attr_numa_node(const union bpf_attr * attr)2379 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2380 {
2381 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2382 attr->numa_node : NUMA_NO_NODE;
2383 }
2384
2385 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2386 int array_map_alloc_check(union bpf_attr *attr);
2387
2388 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2389 union bpf_attr __user *uattr);
2390 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2391 union bpf_attr __user *uattr);
2392 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2393 const union bpf_attr *kattr,
2394 union bpf_attr __user *uattr);
2395 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2396 const union bpf_attr *kattr,
2397 union bpf_attr __user *uattr);
2398 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2399 const union bpf_attr *kattr,
2400 union bpf_attr __user *uattr);
2401 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2402 const union bpf_attr *kattr,
2403 union bpf_attr __user *uattr);
2404 int bpf_prog_test_run_nf(struct bpf_prog *prog,
2405 const union bpf_attr *kattr,
2406 union bpf_attr __user *uattr);
2407 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2408 const struct bpf_prog *prog,
2409 struct bpf_insn_access_aux *info);
2410
bpf_tracing_ctx_access(int off,int size,enum bpf_access_type type)2411 static inline bool bpf_tracing_ctx_access(int off, int size,
2412 enum bpf_access_type type)
2413 {
2414 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2415 return false;
2416 if (type != BPF_READ)
2417 return false;
2418 if (off % size != 0)
2419 return false;
2420 return true;
2421 }
2422
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)2423 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2424 enum bpf_access_type type,
2425 const struct bpf_prog *prog,
2426 struct bpf_insn_access_aux *info)
2427 {
2428 if (!bpf_tracing_ctx_access(off, size, type))
2429 return false;
2430 return btf_ctx_access(off, size, type, prog, info);
2431 }
2432
2433 int btf_struct_access(struct bpf_verifier_log *log,
2434 const struct bpf_reg_state *reg,
2435 int off, int size, enum bpf_access_type atype,
2436 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2437 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2438 const struct btf *btf, u32 id, int off,
2439 const struct btf *need_btf, u32 need_type_id,
2440 bool strict);
2441
2442 int btf_distill_func_proto(struct bpf_verifier_log *log,
2443 struct btf *btf,
2444 const struct btf_type *func_proto,
2445 const char *func_name,
2446 struct btf_func_model *m);
2447
2448 struct bpf_reg_state;
2449 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
2450 struct bpf_reg_state *regs);
2451 int btf_check_subprog_call(struct bpf_verifier_env *env, int subprog,
2452 struct bpf_reg_state *regs);
2453 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
2454 struct bpf_reg_state *reg);
2455 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2456 struct btf *btf, const struct btf_type *t);
2457
2458 struct bpf_prog *bpf_prog_by_id(u32 id);
2459 struct bpf_link *bpf_link_by_id(u32 id);
2460
2461 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
2462 void bpf_task_storage_free(struct task_struct *task);
2463 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2464 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2465 const struct btf_func_model *
2466 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2467 const struct bpf_insn *insn);
2468 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2469 u16 btf_fd_idx, u8 **func_addr);
2470
2471 struct bpf_core_ctx {
2472 struct bpf_verifier_log *log;
2473 const struct btf *btf;
2474 };
2475
2476 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2477 const struct bpf_reg_state *reg,
2478 const char *field_name, u32 btf_id, const char *suffix);
2479
2480 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2481 const struct btf *reg_btf, u32 reg_id,
2482 const struct btf *arg_btf, u32 arg_id);
2483
2484 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2485 int relo_idx, void *insn);
2486
unprivileged_ebpf_enabled(void)2487 static inline bool unprivileged_ebpf_enabled(void)
2488 {
2489 return !sysctl_unprivileged_bpf_disabled;
2490 }
2491
2492 /* Not all bpf prog type has the bpf_ctx.
2493 * For the bpf prog type that has initialized the bpf_ctx,
2494 * this function can be used to decide if a kernel function
2495 * is called by a bpf program.
2496 */
has_current_bpf_ctx(void)2497 static inline bool has_current_bpf_ctx(void)
2498 {
2499 return !!current->bpf_ctx;
2500 }
2501
2502 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2503
2504 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2505 enum bpf_dynptr_type type, u32 offset, u32 size);
2506 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2507 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2508 #else /* !CONFIG_BPF_SYSCALL */
bpf_prog_get(u32 ufd)2509 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2510 {
2511 return ERR_PTR(-EOPNOTSUPP);
2512 }
2513
bpf_prog_get_type_dev(u32 ufd,enum bpf_prog_type type,bool attach_drv)2514 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2515 enum bpf_prog_type type,
2516 bool attach_drv)
2517 {
2518 return ERR_PTR(-EOPNOTSUPP);
2519 }
2520
bpf_prog_add(struct bpf_prog * prog,int i)2521 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2522 {
2523 }
2524
bpf_prog_sub(struct bpf_prog * prog,int i)2525 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2526 {
2527 }
2528
bpf_prog_put(struct bpf_prog * prog)2529 static inline void bpf_prog_put(struct bpf_prog *prog)
2530 {
2531 }
2532
bpf_prog_inc(struct bpf_prog * prog)2533 static inline void bpf_prog_inc(struct bpf_prog *prog)
2534 {
2535 }
2536
2537 static inline struct bpf_prog *__must_check
bpf_prog_inc_not_zero(struct bpf_prog * prog)2538 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2539 {
2540 return ERR_PTR(-EOPNOTSUPP);
2541 }
2542
bpf_link_init(struct bpf_link * link,enum bpf_link_type type,const struct bpf_link_ops * ops,struct bpf_prog * prog)2543 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2544 const struct bpf_link_ops *ops,
2545 struct bpf_prog *prog)
2546 {
2547 }
2548
bpf_link_prime(struct bpf_link * link,struct bpf_link_primer * primer)2549 static inline int bpf_link_prime(struct bpf_link *link,
2550 struct bpf_link_primer *primer)
2551 {
2552 return -EOPNOTSUPP;
2553 }
2554
bpf_link_settle(struct bpf_link_primer * primer)2555 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2556 {
2557 return -EOPNOTSUPP;
2558 }
2559
bpf_link_cleanup(struct bpf_link_primer * primer)2560 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2561 {
2562 }
2563
bpf_link_inc(struct bpf_link * link)2564 static inline void bpf_link_inc(struct bpf_link *link)
2565 {
2566 }
2567
bpf_link_put(struct bpf_link * link)2568 static inline void bpf_link_put(struct bpf_link *link)
2569 {
2570 }
2571
bpf_obj_get_user(const char __user * pathname,int flags)2572 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2573 {
2574 return -EOPNOTSUPP;
2575 }
2576
__dev_flush(void)2577 static inline void __dev_flush(void)
2578 {
2579 }
2580
2581 struct xdp_frame;
2582 struct bpf_dtab_netdev;
2583 struct bpf_cpu_map_entry;
2584
2585 static inline
dev_xdp_enqueue(struct net_device * dev,struct xdp_frame * xdpf,struct net_device * dev_rx)2586 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2587 struct net_device *dev_rx)
2588 {
2589 return 0;
2590 }
2591
2592 static inline
dev_map_enqueue(struct bpf_dtab_netdev * dst,struct xdp_frame * xdpf,struct net_device * dev_rx)2593 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2594 struct net_device *dev_rx)
2595 {
2596 return 0;
2597 }
2598
2599 static inline
dev_map_enqueue_multi(struct xdp_frame * xdpf,struct net_device * dev_rx,struct bpf_map * map,bool exclude_ingress)2600 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2601 struct bpf_map *map, bool exclude_ingress)
2602 {
2603 return 0;
2604 }
2605
2606 struct sk_buff;
2607
dev_map_generic_redirect(struct bpf_dtab_netdev * dst,struct sk_buff * skb,struct bpf_prog * xdp_prog)2608 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2609 struct sk_buff *skb,
2610 struct bpf_prog *xdp_prog)
2611 {
2612 return 0;
2613 }
2614
2615 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)2616 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2617 struct bpf_prog *xdp_prog, struct bpf_map *map,
2618 bool exclude_ingress)
2619 {
2620 return 0;
2621 }
2622
__cpu_map_flush(void)2623 static inline void __cpu_map_flush(void)
2624 {
2625 }
2626
cpu_map_enqueue(struct bpf_cpu_map_entry * rcpu,struct xdp_frame * xdpf,struct net_device * dev_rx)2627 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2628 struct xdp_frame *xdpf,
2629 struct net_device *dev_rx)
2630 {
2631 return 0;
2632 }
2633
cpu_map_generic_redirect(struct bpf_cpu_map_entry * rcpu,struct sk_buff * skb)2634 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2635 struct sk_buff *skb)
2636 {
2637 return -EOPNOTSUPP;
2638 }
2639
bpf_prog_get_type_path(const char * name,enum bpf_prog_type type)2640 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2641 enum bpf_prog_type type)
2642 {
2643 return ERR_PTR(-EOPNOTSUPP);
2644 }
2645
bpf_prog_test_run_xdp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2646 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2647 const union bpf_attr *kattr,
2648 union bpf_attr __user *uattr)
2649 {
2650 return -ENOTSUPP;
2651 }
2652
bpf_prog_test_run_skb(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2653 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2654 const union bpf_attr *kattr,
2655 union bpf_attr __user *uattr)
2656 {
2657 return -ENOTSUPP;
2658 }
2659
bpf_prog_test_run_tracing(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2660 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2661 const union bpf_attr *kattr,
2662 union bpf_attr __user *uattr)
2663 {
2664 return -ENOTSUPP;
2665 }
2666
bpf_prog_test_run_flow_dissector(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2667 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2668 const union bpf_attr *kattr,
2669 union bpf_attr __user *uattr)
2670 {
2671 return -ENOTSUPP;
2672 }
2673
bpf_prog_test_run_sk_lookup(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2674 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2675 const union bpf_attr *kattr,
2676 union bpf_attr __user *uattr)
2677 {
2678 return -ENOTSUPP;
2679 }
2680
bpf_map_put(struct bpf_map * map)2681 static inline void bpf_map_put(struct bpf_map *map)
2682 {
2683 }
2684
bpf_prog_by_id(u32 id)2685 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2686 {
2687 return ERR_PTR(-ENOTSUPP);
2688 }
2689
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)2690 static inline int btf_struct_access(struct bpf_verifier_log *log,
2691 const struct bpf_reg_state *reg,
2692 int off, int size, enum bpf_access_type atype,
2693 u32 *next_btf_id, enum bpf_type_flag *flag,
2694 const char **field_name)
2695 {
2696 return -EACCES;
2697 }
2698
2699 static inline const struct bpf_func_proto *
bpf_base_func_proto(enum bpf_func_id func_id)2700 bpf_base_func_proto(enum bpf_func_id func_id)
2701 {
2702 return NULL;
2703 }
2704
bpf_task_storage_free(struct task_struct * task)2705 static inline void bpf_task_storage_free(struct task_struct *task)
2706 {
2707 }
2708
bpf_prog_has_kfunc_call(const struct bpf_prog * prog)2709 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2710 {
2711 return false;
2712 }
2713
2714 static inline const struct btf_func_model *
bpf_jit_find_kfunc_model(const struct bpf_prog * prog,const struct bpf_insn * insn)2715 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2716 const struct bpf_insn *insn)
2717 {
2718 return NULL;
2719 }
2720
2721 static inline int
bpf_get_kfunc_addr(const struct bpf_prog * prog,u32 func_id,u16 btf_fd_idx,u8 ** func_addr)2722 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2723 u16 btf_fd_idx, u8 **func_addr)
2724 {
2725 return -ENOTSUPP;
2726 }
2727
unprivileged_ebpf_enabled(void)2728 static inline bool unprivileged_ebpf_enabled(void)
2729 {
2730 return false;
2731 }
2732
has_current_bpf_ctx(void)2733 static inline bool has_current_bpf_ctx(void)
2734 {
2735 return false;
2736 }
2737
bpf_prog_inc_misses_counter(struct bpf_prog * prog)2738 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2739 {
2740 }
2741
bpf_cgrp_storage_free(struct cgroup * cgroup)2742 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
2743 {
2744 }
2745
bpf_dynptr_init(struct bpf_dynptr_kern * ptr,void * data,enum bpf_dynptr_type type,u32 offset,u32 size)2746 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2747 enum bpf_dynptr_type type, u32 offset, u32 size)
2748 {
2749 }
2750
bpf_dynptr_set_null(struct bpf_dynptr_kern * ptr)2751 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
2752 {
2753 }
2754
bpf_dynptr_set_rdonly(struct bpf_dynptr_kern * ptr)2755 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
2756 {
2757 }
2758 #endif /* CONFIG_BPF_SYSCALL */
2759
2760 static __always_inline int
bpf_probe_read_kernel_common(void * dst,u32 size,const void * unsafe_ptr)2761 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
2762 {
2763 int ret = -EFAULT;
2764
2765 if (IS_ENABLED(CONFIG_BPF_EVENTS))
2766 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
2767 if (unlikely(ret < 0))
2768 memset(dst, 0, size);
2769 return ret;
2770 }
2771
2772 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2773 struct btf_mod_pair *used_btfs, u32 len);
2774
bpf_prog_get_type(u32 ufd,enum bpf_prog_type type)2775 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2776 enum bpf_prog_type type)
2777 {
2778 return bpf_prog_get_type_dev(ufd, type, false);
2779 }
2780
2781 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2782 struct bpf_map **used_maps, u32 len);
2783
2784 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2785
2786 int bpf_prog_offload_compile(struct bpf_prog *prog);
2787 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
2788 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2789 struct bpf_prog *prog);
2790
2791 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2792
2793 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2794 int bpf_map_offload_update_elem(struct bpf_map *map,
2795 void *key, void *value, u64 flags);
2796 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2797 int bpf_map_offload_get_next_key(struct bpf_map *map,
2798 void *key, void *next_key);
2799
2800 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2801
2802 struct bpf_offload_dev *
2803 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2804 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2805 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2806 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2807 struct net_device *netdev);
2808 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2809 struct net_device *netdev);
2810 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2811
2812 void unpriv_ebpf_notify(int new_state);
2813
2814 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2815 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2816 struct bpf_prog_aux *prog_aux);
2817 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
2818 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
2819 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
2820 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
2821
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2822 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2823 {
2824 return aux->dev_bound;
2825 }
2826
bpf_prog_is_offloaded(const struct bpf_prog_aux * aux)2827 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
2828 {
2829 return aux->offload_requested;
2830 }
2831
2832 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
2833
bpf_map_is_offloaded(struct bpf_map * map)2834 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2835 {
2836 return unlikely(map->ops == &bpf_map_offload_ops);
2837 }
2838
2839 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2840 void bpf_map_offload_map_free(struct bpf_map *map);
2841 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
2842 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2843 const union bpf_attr *kattr,
2844 union bpf_attr __user *uattr);
2845
2846 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2847 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2848 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2849 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2850 union bpf_attr __user *uattr);
2851
2852 void sock_map_unhash(struct sock *sk);
2853 void sock_map_destroy(struct sock *sk);
2854 void sock_map_close(struct sock *sk, long timeout);
2855 #else
bpf_dev_bound_kfunc_check(struct bpf_verifier_log * log,struct bpf_prog_aux * prog_aux)2856 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2857 struct bpf_prog_aux *prog_aux)
2858 {
2859 return -EOPNOTSUPP;
2860 }
2861
bpf_dev_bound_resolve_kfunc(struct bpf_prog * prog,u32 func_id)2862 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
2863 u32 func_id)
2864 {
2865 return NULL;
2866 }
2867
bpf_prog_dev_bound_init(struct bpf_prog * prog,union bpf_attr * attr)2868 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
2869 union bpf_attr *attr)
2870 {
2871 return -EOPNOTSUPP;
2872 }
2873
bpf_prog_dev_bound_inherit(struct bpf_prog * new_prog,struct bpf_prog * old_prog)2874 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
2875 struct bpf_prog *old_prog)
2876 {
2877 return -EOPNOTSUPP;
2878 }
2879
bpf_dev_bound_netdev_unregister(struct net_device * dev)2880 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
2881 {
2882 }
2883
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2884 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2885 {
2886 return false;
2887 }
2888
bpf_prog_is_offloaded(struct bpf_prog_aux * aux)2889 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
2890 {
2891 return false;
2892 }
2893
bpf_prog_dev_bound_match(const struct bpf_prog * lhs,const struct bpf_prog * rhs)2894 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
2895 {
2896 return false;
2897 }
2898
bpf_map_is_offloaded(struct bpf_map * map)2899 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2900 {
2901 return false;
2902 }
2903
bpf_map_offload_map_alloc(union bpf_attr * attr)2904 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2905 {
2906 return ERR_PTR(-EOPNOTSUPP);
2907 }
2908
bpf_map_offload_map_free(struct bpf_map * map)2909 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2910 {
2911 }
2912
bpf_map_offload_map_mem_usage(const struct bpf_map * map)2913 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
2914 {
2915 return 0;
2916 }
2917
bpf_prog_test_run_syscall(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2918 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2919 const union bpf_attr *kattr,
2920 union bpf_attr __user *uattr)
2921 {
2922 return -ENOTSUPP;
2923 }
2924
2925 #ifdef CONFIG_BPF_SYSCALL
sock_map_get_from_fd(const union bpf_attr * attr,struct bpf_prog * prog)2926 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2927 struct bpf_prog *prog)
2928 {
2929 return -EINVAL;
2930 }
2931
sock_map_prog_detach(const union bpf_attr * attr,enum bpf_prog_type ptype)2932 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2933 enum bpf_prog_type ptype)
2934 {
2935 return -EOPNOTSUPP;
2936 }
2937
sock_map_update_elem_sys(struct bpf_map * map,void * key,void * value,u64 flags)2938 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2939 u64 flags)
2940 {
2941 return -EOPNOTSUPP;
2942 }
2943
sock_map_bpf_prog_query(const union bpf_attr * attr,union bpf_attr __user * uattr)2944 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2945 union bpf_attr __user *uattr)
2946 {
2947 return -EINVAL;
2948 }
2949 #endif /* CONFIG_BPF_SYSCALL */
2950 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2951
2952 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2953 void bpf_sk_reuseport_detach(struct sock *sk);
2954 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2955 void *value);
2956 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2957 void *value, u64 map_flags);
2958 #else
bpf_sk_reuseport_detach(struct sock * sk)2959 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2960 {
2961 }
2962
2963 #ifdef CONFIG_BPF_SYSCALL
bpf_fd_reuseport_array_lookup_elem(struct bpf_map * map,void * key,void * value)2964 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2965 void *key, void *value)
2966 {
2967 return -EOPNOTSUPP;
2968 }
2969
bpf_fd_reuseport_array_update_elem(struct bpf_map * map,void * key,void * value,u64 map_flags)2970 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2971 void *key, void *value,
2972 u64 map_flags)
2973 {
2974 return -EOPNOTSUPP;
2975 }
2976 #endif /* CONFIG_BPF_SYSCALL */
2977 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2978
2979 /* verifier prototypes for helper functions called from eBPF programs */
2980 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2981 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2982 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2983 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2984 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2985 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2986 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
2987
2988 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2989 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2990 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2991 extern const struct bpf_func_proto bpf_tail_call_proto;
2992 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2993 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2994 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
2995 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2996 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2997 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2998 extern const struct bpf_func_proto bpf_get_stackid_proto;
2999 extern const struct bpf_func_proto bpf_get_stack_proto;
3000 extern const struct bpf_func_proto bpf_get_task_stack_proto;
3001 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
3002 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
3003 extern const struct bpf_func_proto bpf_sock_map_update_proto;
3004 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
3005 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
3006 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3007 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3008 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3009 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3010 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3011 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3012 extern const struct bpf_func_proto bpf_spin_lock_proto;
3013 extern const struct bpf_func_proto bpf_spin_unlock_proto;
3014 extern const struct bpf_func_proto bpf_get_local_storage_proto;
3015 extern const struct bpf_func_proto bpf_strtol_proto;
3016 extern const struct bpf_func_proto bpf_strtoul_proto;
3017 extern const struct bpf_func_proto bpf_tcp_sock_proto;
3018 extern const struct bpf_func_proto bpf_jiffies64_proto;
3019 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3020 extern const struct bpf_func_proto bpf_event_output_data_proto;
3021 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3022 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3023 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3024 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3025 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3026 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3027 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3028 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3029 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3030 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3031 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3032 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3033 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3034 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3035 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3036 extern const struct bpf_func_proto bpf_copy_from_user_proto;
3037 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3038 extern const struct bpf_func_proto bpf_snprintf_proto;
3039 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3040 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3041 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3042 extern const struct bpf_func_proto bpf_sock_from_file_proto;
3043 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3044 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3045 extern const struct bpf_func_proto bpf_task_storage_get_proto;
3046 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3047 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3048 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3049 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3050 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3051 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3052 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3053 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3054 extern const struct bpf_func_proto bpf_find_vma_proto;
3055 extern const struct bpf_func_proto bpf_loop_proto;
3056 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3057 extern const struct bpf_func_proto bpf_set_retval_proto;
3058 extern const struct bpf_func_proto bpf_get_retval_proto;
3059 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3060 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3061 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3062
3063 const struct bpf_func_proto *tracing_prog_func_proto(
3064 enum bpf_func_id func_id, const struct bpf_prog *prog);
3065
3066 /* Shared helpers among cBPF and eBPF. */
3067 void bpf_user_rnd_init_once(void);
3068 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3069 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3070
3071 #if defined(CONFIG_NET)
3072 bool bpf_sock_common_is_valid_access(int off, int size,
3073 enum bpf_access_type type,
3074 struct bpf_insn_access_aux *info);
3075 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3076 struct bpf_insn_access_aux *info);
3077 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3078 const struct bpf_insn *si,
3079 struct bpf_insn *insn_buf,
3080 struct bpf_prog *prog,
3081 u32 *target_size);
3082 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3083 struct bpf_dynptr_kern *ptr);
3084 #else
bpf_sock_common_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3085 static inline bool bpf_sock_common_is_valid_access(int off, int size,
3086 enum bpf_access_type type,
3087 struct bpf_insn_access_aux *info)
3088 {
3089 return false;
3090 }
bpf_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3091 static inline bool bpf_sock_is_valid_access(int off, int size,
3092 enum bpf_access_type type,
3093 struct bpf_insn_access_aux *info)
3094 {
3095 return false;
3096 }
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)3097 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3098 const struct bpf_insn *si,
3099 struct bpf_insn *insn_buf,
3100 struct bpf_prog *prog,
3101 u32 *target_size)
3102 {
3103 return 0;
3104 }
bpf_dynptr_from_skb_rdonly(struct sk_buff * skb,u64 flags,struct bpf_dynptr_kern * ptr)3105 static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3106 struct bpf_dynptr_kern *ptr)
3107 {
3108 return -EOPNOTSUPP;
3109 }
3110 #endif
3111
3112 #ifdef CONFIG_INET
3113 struct sk_reuseport_kern {
3114 struct sk_buff *skb;
3115 struct sock *sk;
3116 struct sock *selected_sk;
3117 struct sock *migrating_sk;
3118 void *data_end;
3119 u32 hash;
3120 u32 reuseport_id;
3121 bool bind_inany;
3122 };
3123 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3124 struct bpf_insn_access_aux *info);
3125
3126 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3127 const struct bpf_insn *si,
3128 struct bpf_insn *insn_buf,
3129 struct bpf_prog *prog,
3130 u32 *target_size);
3131
3132 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3133 struct bpf_insn_access_aux *info);
3134
3135 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3136 const struct bpf_insn *si,
3137 struct bpf_insn *insn_buf,
3138 struct bpf_prog *prog,
3139 u32 *target_size);
3140 #else
bpf_tcp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3141 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3142 enum bpf_access_type type,
3143 struct bpf_insn_access_aux *info)
3144 {
3145 return false;
3146 }
3147
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)3148 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3149 const struct bpf_insn *si,
3150 struct bpf_insn *insn_buf,
3151 struct bpf_prog *prog,
3152 u32 *target_size)
3153 {
3154 return 0;
3155 }
bpf_xdp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3156 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3157 enum bpf_access_type type,
3158 struct bpf_insn_access_aux *info)
3159 {
3160 return false;
3161 }
3162
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)3163 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3164 const struct bpf_insn *si,
3165 struct bpf_insn *insn_buf,
3166 struct bpf_prog *prog,
3167 u32 *target_size)
3168 {
3169 return 0;
3170 }
3171 #endif /* CONFIG_INET */
3172
3173 enum bpf_text_poke_type {
3174 BPF_MOD_CALL,
3175 BPF_MOD_JUMP,
3176 };
3177
3178 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3179 void *addr1, void *addr2);
3180
3181 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3182 struct bpf_prog *new, struct bpf_prog *old);
3183
3184 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3185 int bpf_arch_text_invalidate(void *dst, size_t len);
3186
3187 struct btf_id_set;
3188 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3189
3190 #define MAX_BPRINTF_VARARGS 12
3191 #define MAX_BPRINTF_BUF 1024
3192
3193 struct bpf_bprintf_data {
3194 u32 *bin_args;
3195 char *buf;
3196 bool get_bin_args;
3197 bool get_buf;
3198 };
3199
3200 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3201 u32 num_args, struct bpf_bprintf_data *data);
3202 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3203
3204 #ifdef CONFIG_BPF_LSM
3205 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3206 void bpf_cgroup_atype_put(int cgroup_atype);
3207 #else
bpf_cgroup_atype_get(u32 attach_btf_id,int cgroup_atype)3208 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
bpf_cgroup_atype_put(int cgroup_atype)3209 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3210 #endif /* CONFIG_BPF_LSM */
3211
3212 struct key;
3213
3214 #ifdef CONFIG_KEYS
3215 struct bpf_key {
3216 struct key *key;
3217 bool has_ref;
3218 };
3219 #endif /* CONFIG_KEYS */
3220
type_is_alloc(u32 type)3221 static inline bool type_is_alloc(u32 type)
3222 {
3223 return type & MEM_ALLOC;
3224 }
3225
bpf_memcg_flags(gfp_t flags)3226 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3227 {
3228 if (memcg_bpf_enabled())
3229 return flags | __GFP_ACCOUNT;
3230 return flags;
3231 }
3232
3233 #endif /* _LINUX_BPF_H */
3234