git.ipfire.org Git - thirdparty/linux.git/blob

1 /* SPDX-License-Identifier: GPL-2.0-only */

3 */

4 #ifndef _LINUX_BPF_H

5 #define _LINUX_BPF_H 1

7 #include <uapi/linux/bpf.h>

8 #include <uapi/linux/filter.h>

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 #include <linux/cfi.h>

34 struct bpf_verifier_env;

35 struct bpf_verifier_log;

36 struct perf_event;

37 struct bpf_prog;

38 struct bpf_prog_aux;

39 struct bpf_map;

40 struct bpf_arena;

41 struct sock;

42 struct seq_file;

43 struct btf;

44 struct btf_type;

45 struct exception_table_entry;

46 struct seq_operations;

47 struct bpf_iter_aux_info;

48 struct bpf_local_storage;

49 struct bpf_local_storage_map;

50 struct kobject;

51 struct mem_cgroup;

52 struct module;

53 struct bpf_func_state;

54 struct ftrace_ops;

55 struct cgroup;

56 struct bpf_token;

57 struct user_namespace;

58 struct super_block;

59 struct inode;

61 extern struct idr btf_idr;

62 extern spinlock_t btf_idr_lock;

63 extern struct kobject *btf_kobj;

64 extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;

65 extern bool bpf_global_ma_set;

67 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);

68 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,

69 struct bpf_iter_aux_info *aux);

70 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);

71 typedef unsigned int (*bpf_func_t)(const void *,

72 const struct bpf_insn *);

73 struct bpf_iter_seq_info {

74 const struct seq_operations *seq_ops;

75 bpf_iter_init_seq_priv_t init_seq_private;

76 bpf_iter_fini_seq_priv_t fini_seq_private;

77 u32 seq_priv_size;

78 };

80 /* map is generic key/value storage optionally accessible by eBPF programs */

81 struct bpf_map_ops {

82 /* funcs callable from userspace (via syscall) */

83 int (*map_alloc_check)(union bpf_attr *attr);

84 struct bpf_map *(*map_alloc)(union bpf_attr *attr);

85 void (*map_release)(struct bpf_map *map, struct file *map_file);

86 void (*map_free)(struct bpf_map *map);

87 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);

88 void (*map_release_uref)(struct bpf_map *map);

89 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);

90 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,

91 union bpf_attr __user *uattr);

92 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,

93 void *value, u64 flags);

94 int (*map_lookup_and_delete_batch)(struct bpf_map *map,

95 const union bpf_attr *attr,

96 union bpf_attr __user *uattr);

97 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,

98 const union bpf_attr *attr,

99 union bpf_attr __user *uattr);

100 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,

101 union bpf_attr __user *uattr);

102

103 /* funcs callable from userspace and from eBPF programs */

104 void *(*map_lookup_elem)(struct bpf_map *map, void *key);

105 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);

106 long (*map_delete_elem)(struct bpf_map *map, void *key);

107 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);

108 long (*map_pop_elem)(struct bpf_map *map, void *value);

109 long (*map_peek_elem)(struct bpf_map *map, void *value);

110 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);

111

112 /* funcs called by prog_array and perf_event_array map */

113 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,

114 int fd);

115 /* If need_defer is true, the implementation should guarantee that

116 * the to-be-put element is still alive before the bpf program, which

117 * may manipulate it, exists.

118 */

119 void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);

120 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);

121 u32 (*map_fd_sys_lookup_elem)(void *ptr);

122 void (*map_seq_show_elem)(struct bpf_map *map, void *key,

123 struct seq_file *m);

124 int (*map_check_btf)(const struct bpf_map *map,

125 const struct btf *btf,

126 const struct btf_type *key_type,

127 const struct btf_type *value_type);

128

129 /* Prog poke tracking helpers. */

130 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);

131 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);

132 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,

133 struct bpf_prog *new);

134

135 /* Direct value access helpers. */

136 int (*map_direct_value_addr)(const struct bpf_map *map,

137 u64 *imm, u32 off);

138 int (*map_direct_value_meta)(const struct bpf_map *map,

139 u64 imm, u32 *off);

140 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);

141 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,

142 struct poll_table_struct *pts);

143 unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr,

144 unsigned long len, unsigned long pgoff,

145 unsigned long flags);

146

147 /* Functions called by bpf_local_storage maps */

148 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,

149 void *owner, u32 size);

150 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,

151 void *owner, u32 size);

152 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);

153

154 /* Misc helpers.*/

155 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);

156

157 /* map_meta_equal must be implemented for maps that can be

158 * used as an inner map. It is a runtime check to ensure

159 * an inner map can be inserted to an outer map.

160 *

161 * Some properties of the inner map has been used during the

162 * verification time. When inserting an inner map at the runtime,

163 * map_meta_equal has to ensure the inserting map has the same

164 * properties that the verifier has used earlier.

165 */

166 bool (*map_meta_equal)(const struct bpf_map *meta0,

167 const struct bpf_map *meta1);

168

169

170 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,

171 struct bpf_func_state *caller,

172 struct bpf_func_state *callee);

173 long (*map_for_each_callback)(struct bpf_map *map,

174 bpf_callback_t callback_fn,

175 void *callback_ctx, u64 flags);

176

177 u64 (*map_mem_usage)(const struct bpf_map *map);

178

179 /* BTF id of struct allocated by map_alloc */

180 int *map_btf_id;

181

182 /* bpf_iter info used to open a seq_file */

183 const struct bpf_iter_seq_info *iter_seq_info;

184 };

185

186 enum {

187 /* Support at most 11 fields in a BTF type */

188 BTF_FIELDS_MAX = 11,

189 };

190

191 enum btf_field_type {

192 BPF_SPIN_LOCK = (1 << 0),

193 BPF_TIMER = (1 << 1),

194 BPF_KPTR_UNREF = (1 << 2),

195 BPF_KPTR_REF = (1 << 3),

196 BPF_KPTR_PERCPU = (1 << 4),

197 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,

198 BPF_LIST_HEAD = (1 << 5),

199 BPF_LIST_NODE = (1 << 6),

200 BPF_RB_ROOT = (1 << 7),

201 BPF_RB_NODE = (1 << 8),

202 BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE,

203 BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD,

204 BPF_REFCOUNT = (1 << 9),

205 BPF_WORKQUEUE = (1 << 10),

206 };

207

208 typedef void (*btf_dtor_kfunc_t)(void *);

209

210 struct btf_field_kptr {

211 struct btf *btf;

212 struct module *module;

213 /* dtor used if btf_is_kernel(btf), otherwise the type is

214 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used

215 */

216 btf_dtor_kfunc_t dtor;

217 u32 btf_id;

218 };

219

220 struct btf_field_graph_root {

221 struct btf *btf;

222 u32 value_btf_id;

223 u32 node_offset;

224 struct btf_record *value_rec;

225 };

226

227 struct btf_field {

228 u32 offset;

229 u32 size;

230 enum btf_field_type type;

231 union {

232 struct btf_field_kptr kptr;

233 struct btf_field_graph_root graph_root;

234 };

235 };

236

237 struct btf_record {

238 u32 cnt;

239 u32 field_mask;

240 int spin_lock_off;

241 int timer_off;

242 int wq_off;

243 int refcount_off;

244 struct btf_field fields[];

245 };

246

247 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */

248 struct bpf_rb_node_kern {

249 struct rb_node rb_node;

250 void *owner;

251 } __attribute__((aligned(8)));

252

253 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */

254 struct bpf_list_node_kern {

255 struct list_head list_head;

256 void *owner;

257 } __attribute__((aligned(8)));

258

259 struct bpf_map {

260 const struct bpf_map_ops *ops;

261 struct bpf_map *inner_map_meta;

262 #ifdef CONFIG_SECURITY

263 void *security;

264 #endif

265 enum bpf_map_type map_type;

266 u32 key_size;

267 u32 value_size;

268 u32 max_entries;

269 u64 map_extra; /* any per-map-type extra fields */

270 u32 map_flags;

271 u32 id;

272 struct btf_record *record;

273 int numa_node;

274 u32 btf_key_type_id;

275 u32 btf_value_type_id;

276 u32 btf_vmlinux_value_type_id;

277 struct btf *btf;

278 #ifdef CONFIG_MEMCG

279 struct obj_cgroup *objcg;

280 #endif

281 char name[BPF_OBJ_NAME_LEN];

282 struct mutex freeze_mutex;

283 atomic64_t refcnt;

284 atomic64_t usercnt;

285 /* rcu is used before freeing and work is only used during freeing */

286 union {

287 struct work_struct work;

288 struct rcu_head rcu;

289 };

290 atomic64_t writecnt;

291 /* 'Ownership' of program-containing map is claimed by the first program

292 * that is going to use this map or by the first program which FD is

293 * stored in the map to make sure that all callers and callees have the

294 * same prog type, JITed flag and xdp_has_frags flag.

295 */

296 struct {

297 const struct btf_type *attach_func_proto;

298 spinlock_t lock;

299 enum bpf_prog_type type;

300 bool jited;

301 bool xdp_has_frags;

302 } owner;

303 bool bypass_spec_v1;

304 bool frozen; /* write-once; write-protected by freeze_mutex */

305 bool free_after_mult_rcu_gp;

306 bool free_after_rcu_gp;

307 atomic64_t sleepable_refcnt;

308 s64 __percpu *elem_count;

309 };

310

311 static inline const char *btf_field_type_name(enum btf_field_type type)

312 {

313 switch (type) {

314 case BPF_SPIN_LOCK:

315 return "bpf_spin_lock";

316 case BPF_TIMER:

317 return "bpf_timer";

318 case BPF_WORKQUEUE:

319 return "bpf_wq";

320 case BPF_KPTR_UNREF:

321 case BPF_KPTR_REF:

322 return "kptr";

323 case BPF_KPTR_PERCPU:

324 return "percpu_kptr";

325 case BPF_LIST_HEAD:

326 return "bpf_list_head";

327 case BPF_LIST_NODE:

328 return "bpf_list_node";

329 case BPF_RB_ROOT:

330 return "bpf_rb_root";

331 case BPF_RB_NODE:

332 return "bpf_rb_node";

333 case BPF_REFCOUNT:

334 return "bpf_refcount";

335 default:

336 WARN_ON_ONCE(1);

337 return "unknown";

338 }

339 }

340

341 static inline u32 btf_field_type_size(enum btf_field_type type)

342 {

343 switch (type) {

344 case BPF_SPIN_LOCK:

345 return sizeof(struct bpf_spin_lock);

346 case BPF_TIMER:

347 return sizeof(struct bpf_timer);

348 case BPF_WORKQUEUE:

349 return sizeof(struct bpf_wq);

350 case BPF_KPTR_UNREF:

351 case BPF_KPTR_REF:

352 case BPF_KPTR_PERCPU:

353 return sizeof(u64);

354 case BPF_LIST_HEAD:

355 return sizeof(struct bpf_list_head);

356 case BPF_LIST_NODE:

357 return sizeof(struct bpf_list_node);

358 case BPF_RB_ROOT:

359 return sizeof(struct bpf_rb_root);

360 case BPF_RB_NODE:

361 return sizeof(struct bpf_rb_node);

362 case BPF_REFCOUNT:

363 return sizeof(struct bpf_refcount);

364 default:

365 WARN_ON_ONCE(1);

366 return 0;

367 }

368 }

369

370 static inline u32 btf_field_type_align(enum btf_field_type type)

371 {

372 switch (type) {

373 case BPF_SPIN_LOCK:

374 return __alignof__(struct bpf_spin_lock);

375 case BPF_TIMER:

376 return __alignof__(struct bpf_timer);

377 case BPF_WORKQUEUE:

378 return __alignof__(struct bpf_wq);

379 case BPF_KPTR_UNREF:

380 case BPF_KPTR_REF:

381 case BPF_KPTR_PERCPU:

382 return __alignof__(u64);

383 case BPF_LIST_HEAD:

384 return __alignof__(struct bpf_list_head);

385 case BPF_LIST_NODE:

386 return __alignof__(struct bpf_list_node);

387 case BPF_RB_ROOT:

388 return __alignof__(struct bpf_rb_root);

389 case BPF_RB_NODE:

390 return __alignof__(struct bpf_rb_node);

391 case BPF_REFCOUNT:

392 return __alignof__(struct bpf_refcount);

393 default:

394 WARN_ON_ONCE(1);

395 return 0;

396 }

397 }

398

399 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)

400 {

401 memset(addr, 0, field->size);

402

403 switch (field->type) {

404 case BPF_REFCOUNT:

405 refcount_set((refcount_t *)addr, 1);

406 break;

407 case BPF_RB_NODE:

408 RB_CLEAR_NODE((struct rb_node *)addr);

409 break;

410 case BPF_LIST_HEAD:

411 case BPF_LIST_NODE:

412 INIT_LIST_HEAD((struct list_head *)addr);

413 break;

414 case BPF_RB_ROOT:

415 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */

416 case BPF_SPIN_LOCK:

417 case BPF_TIMER:

418 case BPF_WORKQUEUE:

419 case BPF_KPTR_UNREF:

420 case BPF_KPTR_REF:

421 case BPF_KPTR_PERCPU:

422 break;

423 default:

424 WARN_ON_ONCE(1);

425 return;

426 }

427 }

428

429 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)

430 {

431 if (IS_ERR_OR_NULL(rec))

432 return false;

433 return rec->field_mask & type;

434 }

435

436 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)

437 {

438 int i;

439

440 if (IS_ERR_OR_NULL(rec))

441 return;

442 for (i = 0; i < rec->cnt; i++)

443 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);

444 }

445

446 /* 'dst' must be a temporary buffer and should not point to memory that is being

447 * used in parallel by a bpf program or bpf syscall, otherwise the access from

448 * the bpf program or bpf syscall may be corrupted by the reinitialization,

449 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory

450 * allocator, it is still possible for 'dst' to be used in parallel by a bpf

451 * program or bpf syscall.

452 */

453 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)

454 {

455 bpf_obj_init(map->record, dst);

456 }

457

458 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and

459 * forced to use 'long' read/writes to try to atomically copy long counters.

460 * Best-effort only. No barriers here, since it _will_ race with concurrent

461 * updates from BPF programs. Called from bpf syscall and mostly used with

462 * size 8 or 16 bytes, so ask compiler to inline it.

463 */

464 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)

465 {

466 const long *lsrc = src;

467 long *ldst = dst;

468

469 size /= sizeof(long);

470 while (size--)

471 data_race(*ldst++ = *lsrc++);

472 }

473

474 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */

475 static inline void bpf_obj_memcpy(struct btf_record *rec,

476 void *dst, void *src, u32 size,

477 bool long_memcpy)

478 {

479 u32 curr_off = 0;

480 int i;

481

482 if (IS_ERR_OR_NULL(rec)) {

483 if (long_memcpy)

484 bpf_long_memcpy(dst, src, round_up(size, 8));

485 else

486 memcpy(dst, src, size);

487 return;

488 }

489

490 for (i = 0; i < rec->cnt; i++) {

491 u32 next_off = rec->fields[i].offset;

492 u32 sz = next_off - curr_off;

493

494 memcpy(dst + curr_off, src + curr_off, sz);

495 curr_off += rec->fields[i].size + sz;

496 }

497 memcpy(dst + curr_off, src + curr_off, size - curr_off);

498 }

499

500 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)

501 {

502 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);

503 }

504

505 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)

506 {

507 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);

508 }

509

510 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)

511 {

512 u32 curr_off = 0;

513 int i;

514

515 if (IS_ERR_OR_NULL(rec)) {

516 memset(dst, 0, size);

517 return;

518 }

519

520 for (i = 0; i < rec->cnt; i++) {

521 u32 next_off = rec->fields[i].offset;

522 u32 sz = next_off - curr_off;

523

524 memset(dst + curr_off, 0, sz);

525 curr_off += rec->fields[i].size + sz;

526 }

527 memset(dst + curr_off, 0, size - curr_off);

528 }

529

530 static inline void zero_map_value(struct bpf_map *map, void *dst)

531 {

532 bpf_obj_memzero(map->record, dst, map->value_size);

533 }

534

535 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,

536 bool lock_src);

537 void bpf_timer_cancel_and_free(void *timer);

538 void bpf_wq_cancel_and_free(void *timer);

539 void bpf_list_head_free(const struct btf_field *field, void *list_head,

540 struct bpf_spin_lock *spin_lock);

541 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,

542 struct bpf_spin_lock *spin_lock);

543 u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena);

544 u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena);

545 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);

546

547 struct bpf_offload_dev;

548 struct bpf_offloaded_map;

549

550 struct bpf_map_dev_ops {

551 int (*map_get_next_key)(struct bpf_offloaded_map *map,

552 void *key, void *next_key);

553 int (*map_lookup_elem)(struct bpf_offloaded_map *map,

554 void *key, void *value);

555 int (*map_update_elem)(struct bpf_offloaded_map *map,

556 void *key, void *value, u64 flags);

557 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);

558 };

559

560 struct bpf_offloaded_map {

561 struct bpf_map map;

562 struct net_device *netdev;

563 const struct bpf_map_dev_ops *dev_ops;

564 void *dev_priv;

565 struct list_head offloads;

566 };

567

568 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)

569 {

570 return container_of(map, struct bpf_offloaded_map, map);

571 }

572

573 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)

574 {

575 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;

576 }

577

578 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)

579 {

580 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&

581 map->ops->map_seq_show_elem;

582 }

583

584 int map_check_no_btf(const struct bpf_map *map,

585 const struct btf *btf,

586 const struct btf_type *key_type,

587 const struct btf_type *value_type);

588

589 bool bpf_map_meta_equal(const struct bpf_map *meta0,

590 const struct bpf_map *meta1);

591

592 extern const struct bpf_map_ops bpf_map_offload_ops;

593

594 /* bpf_type_flag contains a set of flags that are applicable to the values of

595 * arg_type, ret_type and reg_type. For example, a pointer value may be null,

596 * or a memory is read-only. We classify types into two categories: base types

597 * and extended types. Extended types are base types combined with a type flag.

598 *

599 * Currently there are no more than 32 base types in arg_type, ret_type and

600 * reg_types.

601 */

602 #define BPF_BASE_TYPE_BITS 8

603

604 enum bpf_type_flag {

605 /* PTR may be NULL. */

606 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),

607

608 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is

609 * compatible with both mutable and immutable memory.

610 */

611 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),

612

613 /* MEM points to BPF ring buffer reservation. */

614 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),

615

616 /* MEM is in user address space. */

617 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),

618

619 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged

620 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In

621 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()

622 * or bpf_this_cpu_ptr(), which will return the pointer corresponding

623 * to the specified cpu.

624 */

625 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),

626

627 /* Indicates that the argument will be released. */

628 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),

629

630 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark

631 * unreferenced and referenced kptr loaded from map value using a load

632 * instruction, so that they can only be dereferenced but not escape the

633 * BPF program into the kernel (i.e. cannot be passed as arguments to

634 * kfunc or bpf helpers).

635 */

636 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),

637

638 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),

639

640 /* DYNPTR points to memory local to the bpf program. */

641 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),

642

643 /* DYNPTR points to a kernel-produced ringbuf record. */

644 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),

645

646 /* Size is known at compile time. */

647 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),

648

649 /* MEM is of an allocated object of type in program BTF. This is used to

650 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.

651 */

652 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),

653

654 /* PTR was passed from the kernel in a trusted context, and may be

655 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.

656 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.

657 * PTR_UNTRUSTED refers to a kptr that was read directly from a map

658 * without invoking bpf_kptr_xchg(). What we really need to know is

659 * whether a pointer is safe to pass to a kfunc or BPF helper function.

660 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF

661 * helpers, they do not cover all possible instances of unsafe

662 * pointers. For example, a pointer that was obtained from walking a

663 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the

664 * fact that it may be NULL, invalid, etc. This is due to backwards

665 * compatibility requirements, as this was the behavior that was first

666 * introduced when kptrs were added. The behavior is now considered

667 * deprecated, and PTR_UNTRUSTED will eventually be removed.

668 *

669 * PTR_TRUSTED, on the other hand, is a pointer that the kernel

670 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.

671 * For example, pointers passed to tracepoint arguments are considered

672 * PTR_TRUSTED, as are pointers that are passed to struct_ops

673 * callbacks. As alluded to above, pointers that are obtained from

674 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a

675 * struct task_struct *task is PTR_TRUSTED, then accessing

676 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored

677 * in a BPF register. Similarly, pointers passed to certain programs

678 * types such as kretprobes are not guaranteed to be valid, as they may

679 * for example contain an object that was recently freed.

680 */

681 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),

682

683 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */

684 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),

685

686 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.

687 * Currently only valid for linked-list and rbtree nodes. If the nodes

688 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.

689 */

690 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),

691

692 /* DYNPTR points to sk_buff */

693 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),

694

695 /* DYNPTR points to xdp_buff */

696 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),

697

698 /* Memory must be aligned on some architectures, used in combination with

699 * MEM_FIXED_SIZE.

700 */

701 MEM_ALIGNED = BIT(17 + BPF_BASE_TYPE_BITS),

702

703 __BPF_TYPE_FLAG_MAX,

704 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,

705 };

706

707 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \

708 | DYNPTR_TYPE_XDP)

709

710 /* Max number of base types. */

711 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)

712

713 /* Max number of all types. */

714 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))

715

716 /* function argument constraints */

717 enum bpf_arg_type {

718 ARG_DONTCARE = 0, /* unused argument in helper function */

719

720 /* the following constraints used to prototype

721 * bpf_map_lookup/update/delete_elem() functions

722 */

723 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */

724 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */

725 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */

726

727 /* Used to prototype bpf_memcmp() and other functions that access data

728 * on eBPF program stack

729 */

730 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */

731 ARG_PTR_TO_ARENA,

732

733 ARG_CONST_SIZE, /* number of bytes accessed from memory */

734 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */

735

736 ARG_PTR_TO_CTX, /* pointer to context */

737 ARG_ANYTHING, /* any (initialized) argument is ok */

738 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */

739 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */

740 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */

741 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */

742 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */

743 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */

744 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */

745 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */

746 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */

747 ARG_PTR_TO_STACK, /* pointer to stack */

748 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */

749 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */

750 ARG_KPTR_XCHG_DEST, /* pointer to destination that kptrs are bpf_kptr_xchg'd into */

751 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */

752 __BPF_ARG_TYPE_MAX,

753

754 /* Extended arg_types. */

755 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,

756 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,

757 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,

758 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,

759 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,

760 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,

761 /* pointer to memory does not need to be initialized, helper function must fill

762 * all bytes or clear them in error case.

763 */

764 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM,

765 /* Pointer to valid memory of size known at compile time. */

766 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,

767

768 /* This must be the last entry. Its purpose is to ensure the enum is

769 * wide enough to hold the higher bits reserved for bpf_type_flag.

770 */

771 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,

772 };

773 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);

774

775 /* type of values returned from helper functions */

776 enum bpf_return_type {

777 RET_INTEGER, /* function returns integer */

778 RET_VOID, /* function doesn't return anything */

779 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */

780 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */

781 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */

782 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */

783 RET_PTR_TO_MEM, /* returns a pointer to memory */

784 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */

785 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */

786 __BPF_RET_TYPE_MAX,

787

788 /* Extended ret_types. */

789 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,

790 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,

791 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,

792 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,

793 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,

794 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,

795 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,

796 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,

797

798 /* This must be the last entry. Its purpose is to ensure the enum is

799 * wide enough to hold the higher bits reserved for bpf_type_flag.

800 */

801 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,

802 };

803 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);

804

805 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs

806 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL

807 * instructions after verifying

808 */

809 struct bpf_func_proto {

810 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);

811 bool gpl_only;

812 bool pkt_access;

813 bool might_sleep;

814 /* set to true if helper follows contract for llvm

815 * attribute bpf_fastcall:

816 * - void functions do not scratch r0

817 * - functions taking N arguments scratch only registers r1-rN

818 */

819 bool allow_fastcall;

820 enum bpf_return_type ret_type;

821 union {

822 struct {

823 enum bpf_arg_type arg1_type;

824 enum bpf_arg_type arg2_type;

825 enum bpf_arg_type arg3_type;

826 enum bpf_arg_type arg4_type;

827 enum bpf_arg_type arg5_type;

828 };

829 enum bpf_arg_type arg_type[5];

830 };

831 union {

832 struct {

833 u32 *arg1_btf_id;

834 u32 *arg2_btf_id;

835 u32 *arg3_btf_id;

836 u32 *arg4_btf_id;

837 u32 *arg5_btf_id;

838 };

839 u32 *arg_btf_id[5];

840 struct {

841 size_t arg1_size;

842 size_t arg2_size;

843 size_t arg3_size;

844 size_t arg4_size;

845 size_t arg5_size;

846 };

847 size_t arg_size[5];

848 };

849 int *ret_btf_id; /* return value btf_id */

850 bool (*allowed)(const struct bpf_prog *prog);

851 };

852

853 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is

854 * the first argument to eBPF programs.

855 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'

856 */

857 struct bpf_context;

858

859 enum bpf_access_type {

860 BPF_READ = 1,

861 BPF_WRITE = 2

862 };

863

864 /* types of values stored in eBPF registers */

865 /* Pointer types represent:

866 * pointer

867 * pointer + imm

868 * pointer + (u16) var

869 * pointer + (u16) var + imm

870 * if (range > 0) then [ptr, ptr + range - off) is safe to access

871 * if (id > 0) means that some 'var' was added

872 * if (off > 0) means that 'imm' was added

873 */

874 enum bpf_reg_type {

875 NOT_INIT = 0, /* nothing was written into register */

876 SCALAR_VALUE, /* reg doesn't contain a valid pointer */

877 PTR_TO_CTX, /* reg points to bpf_context */

878 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */

879 PTR_TO_MAP_VALUE, /* reg points to map element value */

880 PTR_TO_MAP_KEY, /* reg points to a map element key */

881 PTR_TO_STACK, /* reg == frame_pointer + offset */

882 PTR_TO_PACKET_META, /* skb->data - meta_len */

883 PTR_TO_PACKET, /* reg points to skb->data */

884 PTR_TO_PACKET_END, /* skb->data + headlen */

885 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */

886 PTR_TO_SOCKET, /* reg points to struct bpf_sock */

887 PTR_TO_SOCK_COMMON, /* reg points to sock_common */

888 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */

889 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */

890 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */

891 /* PTR_TO_BTF_ID points to a kernel struct that does not need

892 * to be null checked by the BPF program. This does not imply the

893 * pointer is _not_ null and in practice this can easily be a null

894 * pointer when reading pointer chains. The assumption is program

895 * context will handle null pointer dereference typically via fault

896 * handling. The verifier must keep this in mind and can make no

897 * assumptions about null or non-null when doing branch analysis.

898 * Further, when passed into helpers the helpers can not, without

899 * additional context, assume the value is non-null.

900 */

901 PTR_TO_BTF_ID,

902 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not

903 * been checked for null. Used primarily to inform the verifier

904 * an explicit null check is required for this struct.

905 */

906 PTR_TO_MEM, /* reg points to valid memory region */

907 PTR_TO_ARENA,

908 PTR_TO_BUF, /* reg points to a read/write buffer */

909 PTR_TO_FUNC, /* reg points to a bpf program function */

910 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */

911 __BPF_REG_TYPE_MAX,

912

913 /* Extended reg_types. */

914 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,

915 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,

916 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,

917 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,

918 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,

919

920 /* This must be the last entry. Its purpose is to ensure the enum is

921 * wide enough to hold the higher bits reserved for bpf_type_flag.

922 */

923 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,

924 };

925 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);

926

927 /* The information passed from prog-specific *_is_valid_access

928 * back to the verifier.

929 */

930 struct bpf_insn_access_aux {

931 enum bpf_reg_type reg_type;

932 bool is_ldsx;

933 union {

934 int ctx_field_size;

935 struct {

936 struct btf *btf;

937 u32 btf_id;

938 };

939 };

940 struct bpf_verifier_log *log; /* for verbose logs */

941 bool is_retval; /* is accessing function return value ? */

942 };

943

944 static inline void

945 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)

946 {

947 aux->ctx_field_size = size;

948 }

949

950 static bool bpf_is_ldimm64(const struct bpf_insn *insn)

951 {

952 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);

953 }

954

955 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)

956 {

957 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;

958 }

959

960 struct bpf_prog_ops {

961 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,

962 union bpf_attr __user *uattr);

963 };

964

965 struct bpf_reg_state;

966 struct bpf_verifier_ops {

967 /* return eBPF function prototype for verification */

968 const struct bpf_func_proto *

969 (*get_func_proto)(enum bpf_func_id func_id,

970 const struct bpf_prog *prog);

971

972 /* return true if 'size' wide access at offset 'off' within bpf_context

973 * with 'type' (read or write) is allowed

974 */

975 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,

976 const struct bpf_prog *prog,

977 struct bpf_insn_access_aux *info);

978 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,

979 const struct bpf_prog *prog);

980 int (*gen_epilogue)(struct bpf_insn *insn, const struct bpf_prog *prog,

981 s16 ctx_stack_off);

982 int (*gen_ld_abs)(const struct bpf_insn *orig,

983 struct bpf_insn *insn_buf);

984 u32 (*convert_ctx_access)(enum bpf_access_type type,

985 const struct bpf_insn *src,

986 struct bpf_insn *dst,

987 struct bpf_prog *prog, u32 *target_size);

988 int (*btf_struct_access)(struct bpf_verifier_log *log,

989 const struct bpf_reg_state *reg,

990 int off, int size);

991 };

992

993 struct bpf_prog_offload_ops {

994 /* verifier basic callbacks */

995 int (*insn_hook)(struct bpf_verifier_env *env,

996 int insn_idx, int prev_insn_idx);

997 int (*finalize)(struct bpf_verifier_env *env);

998 /* verifier optimization callbacks (called after .finalize) */

999 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,

1000 struct bpf_insn *insn);

1001 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);

1002 /* program management callbacks */

1003 int (*prepare)(struct bpf_prog *prog);

1004 int (*translate)(struct bpf_prog *prog);

1005 void (*destroy)(struct bpf_prog *prog);

1006 };

1007

1008 struct bpf_prog_offload {

1009 struct bpf_prog *prog;

1010 struct net_device *netdev;

1011 struct bpf_offload_dev *offdev;

1012 void *dev_priv;

1013 struct list_head offloads;

1014 bool dev_state;

1015 bool opt_failed;

1016 void *jited_image;

1017 u32 jited_len;

1018 };

1019

1020 enum bpf_cgroup_storage_type {

1021 BPF_CGROUP_STORAGE_SHARED,

1022 BPF_CGROUP_STORAGE_PERCPU,

1023 __BPF_CGROUP_STORAGE_MAX

1024 };

1025

1026 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX

1027

1028 /* The longest tracepoint has 12 args.

1029 * See include/trace/bpf_probe.h

1030 */

1031 #define MAX_BPF_FUNC_ARGS 12

1032

1033 /* The maximum number of arguments passed through registers

1034 * a single function may have.

1035 */

1036 #define MAX_BPF_FUNC_REG_ARGS 5

1037

1038 /* The argument is a structure. */

1039 #define BTF_FMODEL_STRUCT_ARG BIT(0)

1040

1041 /* The argument is signed. */

1042 #define BTF_FMODEL_SIGNED_ARG BIT(1)

1043

1044 struct btf_func_model {

1045 u8 ret_size;

1046 u8 ret_flags;

1047 u8 nr_args;

1048 u8 arg_size[MAX_BPF_FUNC_ARGS];

1049 u8 arg_flags[MAX_BPF_FUNC_ARGS];

1050 };

1051

1052 /* Restore arguments before returning from trampoline to let original function

1053 * continue executing. This flag is used for fentry progs when there are no

1054 * fexit progs.

1055 */

1056 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)

1057 /* Call original function after fentry progs, but before fexit progs.

1058 * Makes sense for fentry/fexit, normal calls and indirect calls.

1059 */

1060 #define BPF_TRAMP_F_CALL_ORIG BIT(1)

1061 /* Skip current frame and return to parent. Makes sense for fentry/fexit

1062 * programs only. Should not be used with normal calls and indirect calls.

1063 */

1064 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)

1065 /* Store IP address of the caller on the trampoline stack,

1066 * so it's available for trampoline's programs.

1067 */

1068 #define BPF_TRAMP_F_IP_ARG BIT(3)

1069 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */

1070 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)

1071

1072 /* Get original function from stack instead of from provided direct address.

1073 * Makes sense for trampolines with fexit or fmod_ret programs.

1074 */

1075 #define BPF_TRAMP_F_ORIG_STACK BIT(5)

1076

1077 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,

1078 * e.g., a live patch. This flag is set and cleared by ftrace call backs,

1079 */

1080 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)

1081

1082 /* Indicate that current trampoline is in a tail call context. Then, it has to

1083 * cache and restore tail_call_cnt to avoid infinite tail call loop.

1084 */

1085 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)

1086

1087 /*

1088 * Indicate the trampoline should be suitable to receive indirect calls;

1089 * without this indirectly calling the generated code can result in #UD/#CP,

1090 * depending on the CFI options.

1091 *

1092 * Used by bpf_struct_ops.

1093 *

1094 * Incompatible with FENTRY usage, overloads @func_addr argument.

1095 */

1096 #define BPF_TRAMP_F_INDIRECT BIT(8)

1097

1098 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50

1099 * bytes on x86.

1100 */

1101 enum {

1102 #if defined(__s390x__)

1103 BPF_MAX_TRAMP_LINKS = 27,

1104 #else

1105 BPF_MAX_TRAMP_LINKS = 38,

1106 #endif

1107 };

1108

1109 struct bpf_tramp_links {

1110 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];

1111 int nr_links;

1112 };

1113

1114 struct bpf_tramp_run_ctx;

1115

1116 /* Different use cases for BPF trampoline:

1117 * 1. replace nop at the function entry (kprobe equivalent)

1118 * flags = BPF_TRAMP_F_RESTORE_REGS

1119 * fentry = a set of programs to run before returning from trampoline

1120 *

1121 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)

1122 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME

1123 * orig_call = fentry_ip + MCOUNT_INSN_SIZE

1124 * fentry = a set of program to run before calling original function

1125 * fexit = a set of program to run after original function

1126 *

1127 * 3. replace direct call instruction anywhere in the function body

1128 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)

1129 * With flags = 0

1130 * fentry = a set of programs to run before returning from trampoline

1131 * With flags = BPF_TRAMP_F_CALL_ORIG

1132 * orig_call = original callback addr or direct function addr

1133 * fentry = a set of program to run before calling original function

1134 * fexit = a set of program to run after original function

1135 */

1136 struct bpf_tramp_image;

1137 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,

1138 const struct btf_func_model *m, u32 flags,

1139 struct bpf_tramp_links *tlinks,

1140 void *func_addr);

1141 void *arch_alloc_bpf_trampoline(unsigned int size);

1142 void arch_free_bpf_trampoline(void *image, unsigned int size);

1143 int __must_check arch_protect_bpf_trampoline(void *image, unsigned int size);

1144 int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,

1145 struct bpf_tramp_links *tlinks, void *func_addr);

1146

1147 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,

1148 struct bpf_tramp_run_ctx *run_ctx);

1149 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,

1150 struct bpf_tramp_run_ctx *run_ctx);

1151 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);

1152 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);

1153 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,

1154 struct bpf_tramp_run_ctx *run_ctx);

1155 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,

1156 struct bpf_tramp_run_ctx *run_ctx);

1157 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);

1158 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);

1159

1160 struct bpf_ksym {

1161 unsigned long start;

1162 unsigned long end;

1163 char name[KSYM_NAME_LEN];

1164 struct list_head lnode;

1165 struct latch_tree_node tnode;

1166 bool prog;

1167 };

1168

1169 enum bpf_tramp_prog_type {

1170 BPF_TRAMP_FENTRY,

1171 BPF_TRAMP_FEXIT,

1172 BPF_TRAMP_MODIFY_RETURN,

1173 BPF_TRAMP_MAX,

1174 BPF_TRAMP_REPLACE, /* more than MAX */

1175 };

1176

1177 struct bpf_tramp_image {

1178 void *image;

1179 int size;

1180 struct bpf_ksym ksym;

1181 struct percpu_ref pcref;

1182 void *ip_after_call;

1183 void *ip_epilogue;

1184 union {

1185 struct rcu_head rcu;

1186 struct work_struct work;

1187 };

1188 };

1189

1190 struct bpf_trampoline {

1191 /* hlist for trampoline_table */

1192 struct hlist_node hlist;

1193 struct ftrace_ops *fops;

1194 /* serializes access to fields of this trampoline */

1195 struct mutex mutex;

1196 refcount_t refcnt;

1197 u32 flags;

1198 u64 key;

1199 struct {

1200 struct btf_func_model model;

1201 void *addr;

1202 bool ftrace_managed;

1203 } func;

1204 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF

1205 * program by replacing one of its functions. func.addr is the address

1206 * of the function it replaced.

1207 */

1208 struct bpf_prog *extension_prog;

1209 /* list of BPF programs using this trampoline */

1210 struct hlist_head progs_hlist[BPF_TRAMP_MAX];

1211 /* Number of attached programs. A counter per kind. */

1212 int progs_cnt[BPF_TRAMP_MAX];

1213 /* Executable image of trampoline */

1214 struct bpf_tramp_image *cur_image;

1215 };

1216

1217 struct bpf_attach_target_info {

1218 struct btf_func_model fmodel;

1219 long tgt_addr;

1220 struct module *tgt_mod;

1221 const char *tgt_name;

1222 const struct btf_type *tgt_type;

1223 };

1224

1225 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */

1226

1227 struct bpf_dispatcher_prog {

1228 struct bpf_prog *prog;

1229 refcount_t users;

1230 };

1231

1232 struct bpf_dispatcher {

1233 /* dispatcher mutex */

1234 struct mutex mutex;

1235 void *func;

1236 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];

1237 int num_progs;

1238 void *image;

1239 void *rw_image;

1240 u32 image_off;

1241 struct bpf_ksym ksym;

1242 #ifdef CONFIG_HAVE_STATIC_CALL

1243 struct static_call_key *sc_key;

1244 void *sc_tramp;

1245 #endif

1246 };

1247

1248 #ifndef __bpfcall

1249 #define __bpfcall __nocfi

1250 #endif

1251

1252 static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func(

1253 const void *ctx,

1254 const struct bpf_insn *insnsi,

1255 bpf_func_t bpf_func)

1256 {

1257 return bpf_func(ctx, insnsi);

1258 }

1259

1260 /* the implementation of the opaque uapi struct bpf_dynptr */

1261 struct bpf_dynptr_kern {

1262 void *data;

1263 /* Size represents the number of usable bytes of dynptr data.

1264 * If for example the offset is at 4 for a local dynptr whose data is

1265 * of type u64, the number of usable bytes is 4.

1266 *

1267 * The upper 8 bits are reserved. It is as follows:

1268 * Bits 0 - 23 = size

1269 * Bits 24 - 30 = dynptr type

1270 * Bit 31 = whether dynptr is read-only

1271 */

1272 u32 size;

1273 u32 offset;

1274 } __aligned(8);

1275

1276 enum bpf_dynptr_type {

1277 BPF_DYNPTR_TYPE_INVALID,

1278 /* Points to memory that is local to the bpf program */

1279 BPF_DYNPTR_TYPE_LOCAL,

1280 /* Underlying data is a ringbuf record */

1281 BPF_DYNPTR_TYPE_RINGBUF,

1282 /* Underlying data is a sk_buff */

1283 BPF_DYNPTR_TYPE_SKB,

1284 /* Underlying data is a xdp_buff */

1285 BPF_DYNPTR_TYPE_XDP,

1286 };

1287

1288 int bpf_dynptr_check_size(u32 size);

1289 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);

1290 const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);

1291 void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);

1292 bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);

1293

1294 #ifdef CONFIG_BPF_JIT

1295 int bpf_trampoline_link_prog(struct bpf_tramp_link *link,

1296 struct bpf_trampoline *tr,

1297 struct bpf_prog *tgt_prog);

1298 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,

1299 struct bpf_trampoline *tr,

1300 struct bpf_prog *tgt_prog);

1301 struct bpf_trampoline *bpf_trampoline_get(u64 key,

1302 struct bpf_attach_target_info *tgt_info);

1303 void bpf_trampoline_put(struct bpf_trampoline *tr);

1304 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);

1305

1306 /*

1307 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn

1308 * indirection with a direct call to the bpf program. If the architecture does

1309 * not have STATIC_CALL, avoid a double-indirection.

1310 */

1311 #ifdef CONFIG_HAVE_STATIC_CALL

1312

1313 #define __BPF_DISPATCHER_SC_INIT(_name) \

1314 .sc_key = &STATIC_CALL_KEY(_name), \

1315 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),

1316

1317 #define __BPF_DISPATCHER_SC(name) \

1318 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)

1319

1320 #define __BPF_DISPATCHER_CALL(name) \

1321 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)

1322

1323 #define __BPF_DISPATCHER_UPDATE(_d, _new) \

1324 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))

1325

1326 #else

1327 #define __BPF_DISPATCHER_SC_INIT(name)

1328 #define __BPF_DISPATCHER_SC(name)

1329 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)

1330 #define __BPF_DISPATCHER_UPDATE(_d, _new)

1331 #endif

1332

1333 #define BPF_DISPATCHER_INIT(_name) { \

1334 .mutex = __MUTEX_INITIALIZER(_name.mutex), \

1335 .func = &_name##_func, \

1336 .progs = {}, \

1337 .num_progs = 0, \

1338 .image = NULL, \

1339 .image_off = 0, \

1340 .ksym = { \

1341 .name = #_name, \

1342 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \

1343 }, \

1344 __BPF_DISPATCHER_SC_INIT(_name##_call) \

1345 }

1346

1347 #define DEFINE_BPF_DISPATCHER(name) \

1348 __BPF_DISPATCHER_SC(name); \

1349 noinline __bpfcall unsigned int bpf_dispatcher_##name##_func( \

1350 const void *ctx, \

1351 const struct bpf_insn *insnsi, \

1352 bpf_func_t bpf_func) \

1353 { \

1354 return __BPF_DISPATCHER_CALL(name); \

1355 } \

1356 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \

1357 struct bpf_dispatcher bpf_dispatcher_##name = \

1358 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);

1359

1360 #define DECLARE_BPF_DISPATCHER(name) \

1361 unsigned int bpf_dispatcher_##name##_func( \

1362 const void *ctx, \

1363 const struct bpf_insn *insnsi, \

1364 bpf_func_t bpf_func); \

1365 extern struct bpf_dispatcher bpf_dispatcher_##name;

1366

1367 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func

1368 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)

1369 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,

1370 struct bpf_prog *to);

1371 /* Called only from JIT-enabled code, so there's no need for stubs. */

1372 void bpf_image_ksym_add(void *data, unsigned int size, struct bpf_ksym *ksym);

1373 void bpf_image_ksym_del(struct bpf_ksym *ksym);

1374 void bpf_ksym_add(struct bpf_ksym *ksym);

1375 void bpf_ksym_del(struct bpf_ksym *ksym);

1376 int bpf_jit_charge_modmem(u32 size);

1377 void bpf_jit_uncharge_modmem(u32 size);

1378 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);

1379 #else

1380 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,

1381 struct bpf_trampoline *tr,

1382 struct bpf_prog *tgt_prog)

1383 {

1384 return -ENOTSUPP;

1385 }

1386 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,

1387 struct bpf_trampoline *tr,

1388 struct bpf_prog *tgt_prog)

1389 {

1390 return -ENOTSUPP;

1391 }

1392 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,

1393 struct bpf_attach_target_info *tgt_info)

1394 {

1395 return NULL;

1396 }

1397 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}

1398 #define DEFINE_BPF_DISPATCHER(name)

1399 #define DECLARE_BPF_DISPATCHER(name)

1400 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func

1401 #define BPF_DISPATCHER_PTR(name) NULL

1402 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,

1403 struct bpf_prog *from,

1404 struct bpf_prog *to) {}

1405 static inline bool is_bpf_image_address(unsigned long address)

1406 {

1407 return false;

1408 }

1409 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)

1410 {

1411 return false;

1412 }

1413 #endif

1414

1415 struct bpf_func_info_aux {

1416 u16 linkage;

1417 bool unreliable;

1418 bool called : 1;

1419 bool verified : 1;

1420 };

1421

1422 enum bpf_jit_poke_reason {

1423 BPF_POKE_REASON_TAIL_CALL,

1424 };

1425

1426 /* Descriptor of pokes pointing /into/ the JITed image. */

1427 struct bpf_jit_poke_descriptor {

1428 void *tailcall_target;

1429 void *tailcall_bypass;

1430 void *bypass_addr;

1431 void *aux;

1432 union {

1433 struct {

1434 struct bpf_map *map;

1435 u32 key;

1436 } tail_call;

1437 };

1438 bool tailcall_target_stable;

1439 u8 adj_off;

1440 u16 reason;

1441 u32 insn_idx;

1442 };

1443

1444 /* reg_type info for ctx arguments */

1445 struct bpf_ctx_arg_aux {

1446 u32 offset;

1447 enum bpf_reg_type reg_type;

1448 struct btf *btf;

1449 u32 btf_id;

1450 };

1451

1452 struct btf_mod_pair {

1453 struct btf *btf;

1454 struct module *module;

1455 };

1456

1457 struct bpf_kfunc_desc_tab;

1458

1459 struct bpf_prog_aux {

1460 atomic64_t refcnt;

1461 u32 used_map_cnt;

1462 u32 used_btf_cnt;

1463 u32 max_ctx_offset;

1464 u32 max_pkt_offset;

1465 u32 max_tp_access;

1466 u32 stack_depth;

1467 u32 id;

1468 u32 func_cnt; /* used by non-func prog as the number of func progs */

1469 u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */

1470 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */

1471 u32 attach_btf_id; /* in-kernel BTF type id to attach to */

1472 u32 ctx_arg_info_size;

1473 u32 max_rdonly_access;

1474 u32 max_rdwr_access;

1475 struct btf *attach_btf;

1476 const struct bpf_ctx_arg_aux *ctx_arg_info;

1477 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */

1478 struct bpf_prog *dst_prog;

1479 struct bpf_trampoline *dst_trampoline;

1480 enum bpf_prog_type saved_dst_prog_type;

1481 enum bpf_attach_type saved_dst_attach_type;

1482 bool verifier_zext; /* Zero extensions has been inserted by verifier. */

1483 bool dev_bound; /* Program is bound to the netdev. */

1484 bool offload_requested; /* Program is bound and offloaded to the netdev. */

1485 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */

1486 bool attach_tracing_prog; /* true if tracing another tracing program */

1487 bool func_proto_unreliable;

1488 bool tail_call_reachable;

1489 bool xdp_has_frags;

1490 bool exception_cb;

1491 bool exception_boundary;

1492 bool is_extended; /* true if extended by freplace program */

1493 u64 prog_array_member_cnt; /* counts how many times as member of prog_array */

1494 struct mutex ext_mutex; /* mutex for is_extended and prog_array_member_cnt */

1495 struct bpf_arena *arena;

1496 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */

1497 const struct btf_type *attach_func_proto;

1498 /* function name for valid attach_btf_id */

1499 const char *attach_func_name;

1500 struct bpf_prog **func;

1501 void *jit_data; /* JIT specific data. arch dependent */

1502 struct bpf_jit_poke_descriptor *poke_tab;

1503 struct bpf_kfunc_desc_tab *kfunc_tab;

1504 struct bpf_kfunc_btf_tab *kfunc_btf_tab;

1505 u32 size_poke_tab;

1506 #ifdef CONFIG_FINEIBT

1507 struct bpf_ksym ksym_prefix;

1508 #endif

1509 struct bpf_ksym ksym;

1510 const struct bpf_prog_ops *ops;

1511 struct bpf_map **used_maps;

1512 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */

1513 struct btf_mod_pair *used_btfs;

1514 struct bpf_prog *prog;

1515 struct user_struct *user;

1516 u64 load_time; /* ns since boottime */

1517 u32 verified_insns;

1518 int cgroup_atype; /* enum cgroup_bpf_attach_type */

1519 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];

1520 char name[BPF_OBJ_NAME_LEN];

1521 u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64);

1522 #ifdef CONFIG_SECURITY

1523 void *security;

1524 #endif

1525 struct bpf_token *token;

1526 struct bpf_prog_offload *offload;

1527 struct btf *btf;

1528 struct bpf_func_info *func_info;

1529 struct bpf_func_info_aux *func_info_aux;

1530 /* bpf_line_info loaded from userspace. linfo->insn_off

1531 * has the xlated insn offset.

1532 * Both the main and sub prog share the same linfo.

1533 * The subprog can access its first linfo by

1534 * using the linfo_idx.

1535 */

1536 struct bpf_line_info *linfo;

1537 /* jited_linfo is the jited addr of the linfo. It has a

1538 * one to one mapping to linfo:

1539 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.

1540 * Both the main and sub prog share the same jited_linfo.

1541 * The subprog can access its first jited_linfo by

1542 * using the linfo_idx.

1543 */

1544 void **jited_linfo;

1545 u32 func_info_cnt;

1546 u32 nr_linfo;

1547 /* subprog can use linfo_idx to access its first linfo and

1548 * jited_linfo.

1549 * main prog always has linfo_idx == 0

1550 */

1551 u32 linfo_idx;

1552 struct module *mod;

1553 u32 num_exentries;

1554 struct exception_table_entry *extable;

1555 union {

1556 struct work_struct work;

1557 struct rcu_head rcu;

1558 };

1559 };

1560

1561 struct bpf_prog {

1562 u16 pages; /* Number of allocated pages */

1563 u16 jited:1, /* Is our filter JIT'ed? */

1564 jit_requested:1,/* archs need to JIT the prog */

1565 gpl_compatible:1, /* Is filter GPL compatible? */

1566 cb_access:1, /* Is control block accessed? */

1567 dst_needed:1, /* Do we need dst entry? */

1568 blinding_requested:1, /* needs constant blinding */

1569 blinded:1, /* Was blinded */

1570 is_func:1, /* program is a bpf function */

1571 kprobe_override:1, /* Do we override a kprobe? */

1572 has_callchain_buf:1, /* callchain buffer allocated? */

1573 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */

1574 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */

1575 call_get_func_ip:1, /* Do we call get_func_ip() */

1576 tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */

1577 sleepable:1; /* BPF program is sleepable */

1578 enum bpf_prog_type type; /* Type of BPF program */

1579 enum bpf_attach_type expected_attach_type; /* For some prog types */

1580 u32 len; /* Number of filter blocks */

1581 u32 jited_len; /* Size of jited insns in bytes */

1582 u8 tag[BPF_TAG_SIZE];

1583 struct bpf_prog_stats __percpu *stats;

1584 int __percpu *active;

1585 unsigned int (*bpf_func)(const void *ctx,

1586 const struct bpf_insn *insn);

1587 struct bpf_prog_aux *aux; /* Auxiliary fields */

1588 struct sock_fprog_kern *orig_prog; /* Original BPF program */

1589 /* Instructions for interpreter */

1590 union {

1591 DECLARE_FLEX_ARRAY(struct sock_filter, insns);

1592 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);

1593 };

1594 };

1595

1596 struct bpf_array_aux {

1597 /* Programs with direct jumps into programs part of this array. */

1598 struct list_head poke_progs;

1599 struct bpf_map *map;

1600 struct mutex poke_mutex;

1601 struct work_struct work;

1602 };

1603

1604 struct bpf_link {

1605 atomic64_t refcnt;

1606 u32 id;

1607 enum bpf_link_type type;

1608 const struct bpf_link_ops *ops;

1609 struct bpf_prog *prog;

1610 /* rcu is used before freeing, work can be used to schedule that

1611 * RCU-based freeing before that, so they never overlap

1612 */

1613 union {

1614 struct rcu_head rcu;

1615 struct work_struct work;

1616 };

1617 };

1618

1619 struct bpf_link_ops {

1620 void (*release)(struct bpf_link *link);

1621 /* deallocate link resources callback, called without RCU grace period

1622 * waiting

1623 */

1624 void (*dealloc)(struct bpf_link *link);

1625 /* deallocate link resources callback, called after RCU grace period;

1626 * if underlying BPF program is sleepable we go through tasks trace

1627 * RCU GP and then "classic" RCU GP

1628 */

1629 void (*dealloc_deferred)(struct bpf_link *link);

1630 int (*detach)(struct bpf_link *link);

1631 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,

1632 struct bpf_prog *old_prog);

1633 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);

1634 int (*fill_link_info)(const struct bpf_link *link,

1635 struct bpf_link_info *info);

1636 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,

1637 struct bpf_map *old_map);

1638 __poll_t (*poll)(struct file *file, struct poll_table_struct *pts);

1639 };

1640

1641 struct bpf_tramp_link {

1642 struct bpf_link link;

1643 struct hlist_node tramp_hlist;

1644 u64 cookie;

1645 };

1646

1647 struct bpf_shim_tramp_link {

1648 struct bpf_tramp_link link;

1649 struct bpf_trampoline *trampoline;

1650 };

1651

1652 struct bpf_tracing_link {

1653 struct bpf_tramp_link link;

1654 enum bpf_attach_type attach_type;

1655 struct bpf_trampoline *trampoline;

1656 struct bpf_prog *tgt_prog;

1657 };

1658

1659 struct bpf_raw_tp_link {

1660 struct bpf_link link;

1661 struct bpf_raw_event_map *btp;

1662 u64 cookie;

1663 };

1664

1665 struct bpf_link_primer {

1666 struct bpf_link *link;

1667 struct file *file;

1668 int fd;

1669 u32 id;

1670 };

1671

1672 struct bpf_mount_opts {

1673 kuid_t uid;

1674 kgid_t gid;

1675 umode_t mode;

1676

1677 /* BPF token-related delegation options */

1678 u64 delegate_cmds;

1679 u64 delegate_maps;

1680 u64 delegate_progs;

1681 u64 delegate_attachs;

1682 };

1683

1684 struct bpf_token {

1685 struct work_struct work;

1686 atomic64_t refcnt;

1687 struct user_namespace *userns;

1688 u64 allowed_cmds;

1689 u64 allowed_maps;

1690 u64 allowed_progs;

1691 u64 allowed_attachs;

1692 #ifdef CONFIG_SECURITY

1693 void *security;

1694 #endif

1695 };

1696

1697 struct bpf_struct_ops_value;

1698 struct btf_member;

1699

1700 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64

1701 /**

1702 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to

1703 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed

1704 * of BPF_PROG_TYPE_STRUCT_OPS progs.

1705 * @verifier_ops: A structure of callbacks that are invoked by the verifier

1706 * when determining whether the struct_ops progs in the

1707 * struct_ops map are valid.

1708 * @init: A callback that is invoked a single time, and before any other

1709 * callback, to initialize the structure. A nonzero return value means

1710 * the subsystem could not be initialized.

1711 * @check_member: When defined, a callback invoked by the verifier to allow

1712 * the subsystem to determine if an entry in the struct_ops map

1713 * is valid. A nonzero return value means that the map is

1714 * invalid and should be rejected by the verifier.

1715 * @init_member: A callback that is invoked for each member of the struct_ops

1716 * map to allow the subsystem to initialize the member. A nonzero

1717 * value means the member could not be initialized. This callback

1718 * is exclusive with the @type, @type_id, @value_type, and

1719 * @value_id fields.

1720 * @reg: A callback that is invoked when the struct_ops map has been

1721 * initialized and is being attached to. Zero means the struct_ops map

1722 * has been successfully registered and is live. A nonzero return value

1723 * means the struct_ops map could not be registered.

1724 * @unreg: A callback that is invoked when the struct_ops map should be

1725 * unregistered.

1726 * @update: A callback that is invoked when the live struct_ops map is being

1727 * updated to contain new values. This callback is only invoked when

1728 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the

1729 * it is assumed that the struct_ops map cannot be updated.

1730 * @validate: A callback that is invoked after all of the members have been

1731 * initialized. This callback should perform static checks on the

1732 * map, meaning that it should either fail or succeed

1733 * deterministically. A struct_ops map that has been validated may

1734 * not necessarily succeed in being registered if the call to @reg

1735 * fails. For example, a valid struct_ops map may be loaded, but

1736 * then fail to be registered due to there being another active

1737 * struct_ops map on the system in the subsystem already. For this

1738 * reason, if this callback is not defined, the check is skipped as

1739 * the struct_ops map will have final verification performed in

1740 * @reg.

1741 * @type: BTF type.

1742 * @value_type: Value type.

1743 * @name: The name of the struct bpf_struct_ops object.

1744 * @func_models: Func models

1745 * @type_id: BTF type id.

1746 * @value_id: BTF value id.

1747 */

1748 struct bpf_struct_ops {

1749 const struct bpf_verifier_ops *verifier_ops;

1750 int (*init)(struct btf *btf);

1751 int (*check_member)(const struct btf_type *t,

1752 const struct btf_member *member,

1753 const struct bpf_prog *prog);

1754 int (*init_member)(const struct btf_type *t,

1755 const struct btf_member *member,

1756 void *kdata, const void *udata);

1757 int (*reg)(void *kdata, struct bpf_link *link);

1758 void (*unreg)(void *kdata, struct bpf_link *link);

1759 int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);

1760 int (*validate)(void *kdata);

1761 void *cfi_stubs;

1762 struct module *owner;

1763 const char *name;

1764 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];

1765 };

1766

1767 /* Every member of a struct_ops type has an instance even a member is not

1768 * an operator (function pointer). The "info" field will be assigned to

1769 * prog->aux->ctx_arg_info of BPF struct_ops programs to provide the

1770 * argument information required by the verifier to verify the program.

1771 *

1772 * btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the

1773 * corresponding entry for an given argument.

1774 */

1775 struct bpf_struct_ops_arg_info {

1776 struct bpf_ctx_arg_aux *info;

1777 u32 cnt;

1778 };

1779

1780 struct bpf_struct_ops_desc {

1781 struct bpf_struct_ops *st_ops;

1782

1783 const struct btf_type *type;

1784 const struct btf_type *value_type;

1785 u32 type_id;

1786 u32 value_id;

1787

1788 /* Collection of argument information for each member */

1789 struct bpf_struct_ops_arg_info *arg_info;

1790 };

1791

1792 enum bpf_struct_ops_state {

1793 BPF_STRUCT_OPS_STATE_INIT,

1794 BPF_STRUCT_OPS_STATE_INUSE,

1795 BPF_STRUCT_OPS_STATE_TOBEFREE,

1796 BPF_STRUCT_OPS_STATE_READY,

1797 };

1798

1799 struct bpf_struct_ops_common_value {

1800 refcount_t refcnt;

1801 enum bpf_struct_ops_state state;

1802 };

1803

1804 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)

1805 /* This macro helps developer to register a struct_ops type and generate

1806 * type information correctly. Developers should use this macro to register

1807 * a struct_ops type instead of calling __register_bpf_struct_ops() directly.

1808 */

1809 #define register_bpf_struct_ops(st_ops, type) \

1810 ({ \

1811 struct bpf_struct_ops_##type { \

1812 struct bpf_struct_ops_common_value common; \

1813 struct type data ____cacheline_aligned_in_smp; \

1814 }; \

1815 BTF_TYPE_EMIT(struct bpf_struct_ops_##type); \

1816 __register_bpf_struct_ops(st_ops); \

1817 })

1818 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))

1819 bool bpf_struct_ops_get(const void *kdata);

1820 void bpf_struct_ops_put(const void *kdata);

1821 int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff);

1822 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,

1823 void *value);

1824 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,

1825 struct bpf_tramp_link *link,

1826 const struct btf_func_model *model,

1827 void *stub_func,

1828 void **image, u32 *image_off,

1829 bool allow_alloc);

1830 void bpf_struct_ops_image_free(void *image);

1831 static inline bool bpf_try_module_get(const void *data, struct module *owner)

1832 {

1833 if (owner == BPF_MODULE_OWNER)

1834 return bpf_struct_ops_get(data);

1835 else

1836 return try_module_get(owner);

1837 }

1838 static inline void bpf_module_put(const void *data, struct module *owner)

1839 {

1840 if (owner == BPF_MODULE_OWNER)

1841 bpf_struct_ops_put(data);

1842 else

1843 module_put(owner);

1844 }

1845 int bpf_struct_ops_link_create(union bpf_attr *attr);

1846

1847 #ifdef CONFIG_NET

1848 /* Define it here to avoid the use of forward declaration */

1849 struct bpf_dummy_ops_state {

1850 int val;

1851 };

1852

1853 struct bpf_dummy_ops {

1854 int (*test_1)(struct bpf_dummy_ops_state *cb);

1855 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,

1856 char a3, unsigned long a4);

1857 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);

1858 };

1859

1860 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,

1861 union bpf_attr __user *uattr);

1862 #endif

1863 int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,

1864 struct btf *btf,

1865 struct bpf_verifier_log *log);

1866 void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map);

1867 void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc);

1868 #else

1869 #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })

1870 static inline bool bpf_try_module_get(const void *data, struct module *owner)

1871 {

1872 return try_module_get(owner);

1873 }

1874 static inline void bpf_module_put(const void *data, struct module *owner)

1875 {

1876 module_put(owner);

1877 }

1878 static inline int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)

1879 {

1880 return -ENOTSUPP;

1881 }

1882 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,

1883 void *key,

1884 void *value)

1885 {

1886 return -EINVAL;

1887 }

1888 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)

1889 {

1890 return -EOPNOTSUPP;

1891 }

1892 static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map)

1893 {

1894 }

1895

1896 static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc)

1897 {

1898 }

1899

1900 #endif

1901

1902 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)

1903 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,

1904 int cgroup_atype);

1905 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);

1906 #else

1907 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,

1908 int cgroup_atype)

1909 {

1910 return -EOPNOTSUPP;

1911 }

1912 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)

1913 {

1914 }

1915 #endif

1916

1917 struct bpf_array {

1918 struct bpf_map map;

1919 u32 elem_size;

1920 u32 index_mask;

1921 struct bpf_array_aux *aux;

1922 union {

1923 DECLARE_FLEX_ARRAY(char, value) __aligned(8);

1924 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);

1925 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);

1926 };

1927 };

1928

1929 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */

1930 #define MAX_TAIL_CALL_CNT 33

1931

1932 /* Maximum number of loops for bpf_loop and bpf_iter_num.

1933 * It's enum to expose it (and thus make it discoverable) through BTF.

1934 */

1935 enum {

1936 BPF_MAX_LOOPS = 8 * 1024 * 1024,

1937 };

1938

1939 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \

1940 BPF_F_RDONLY_PROG | \

1941 BPF_F_WRONLY | \

1942 BPF_F_WRONLY_PROG)

1943

1944 #define BPF_MAP_CAN_READ BIT(0)

1945 #define BPF_MAP_CAN_WRITE BIT(1)

1946

1947 /* Maximum number of user-producer ring buffer samples that can be drained in

1948 * a call to bpf_user_ringbuf_drain().

1949 */

1950 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)

1951

1952 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)

1953 {

1954 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);

1955

1956 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is

1957 * not possible.

1958 */

1959 if (access_flags & BPF_F_RDONLY_PROG)

1960 return BPF_MAP_CAN_READ;

1961 else if (access_flags & BPF_F_WRONLY_PROG)

1962 return BPF_MAP_CAN_WRITE;

1963 else

1964 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;

1965 }

1966

1967 static inline bool bpf_map_flags_access_ok(u32 access_flags)

1968 {

1969 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=

1970 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);

1971 }

1972

1973 struct bpf_event_entry {

1974 struct perf_event *event;

1975 struct file *perf_file;

1976 struct file *map_file;

1977 struct rcu_head rcu;

1978 };

1979

1980 static inline bool map_type_contains_progs(struct bpf_map *map)

1981 {

1982 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||

1983 map->map_type == BPF_MAP_TYPE_DEVMAP ||

1984 map->map_type == BPF_MAP_TYPE_CPUMAP;

1985 }

1986

1987 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);

1988 int bpf_prog_calc_tag(struct bpf_prog *fp);

1989

1990 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);

1991 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);

1992

1993 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,

1994 unsigned long off, unsigned long len);

1995 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,

1996 const struct bpf_insn *src,

1997 struct bpf_insn *dst,

1998 struct bpf_prog *prog,

1999 u32 *target_size);

2000

2001 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,

2002 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);

2003

2004 /* an array of programs to be executed under rcu_lock.

2005 *

2006 * Typical usage:

2007 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);

2008 *

2009 * the structure returned by bpf_prog_array_alloc() should be populated

2010 * with program pointers and the last pointer must be NULL.

2011 * The user has to keep refcnt on the program and make sure the program

2012 * is removed from the array before bpf_prog_put().

2013 * The 'struct bpf_prog_array *' should only be replaced with xchg()

2014 * since other cpus are walking the array of pointers in parallel.

2015 */

2016 struct bpf_prog_array_item {

2017 struct bpf_prog *prog;

2018 union {

2019 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];

2020 u64 bpf_cookie;

2021 };

2022 };

2023

2024 struct bpf_prog_array {

2025 struct rcu_head rcu;

2026 struct bpf_prog_array_item items[];

2027 };

2028

2029 struct bpf_empty_prog_array {

2030 struct bpf_prog_array hdr;

2031 struct bpf_prog *null_prog;

2032 };

2033

2034 /* to avoid allocating empty bpf_prog_array for cgroups that

2035 * don't have bpf program attached use one global 'bpf_empty_prog_array'

2036 * It will not be modified the caller of bpf_prog_array_alloc()

2037 * (since caller requested prog_cnt == 0)

2038 * that pointer should be 'freed' by bpf_prog_array_free()

2039 */

2040 extern struct bpf_empty_prog_array bpf_empty_prog_array;

2041

2042 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);

2043 void bpf_prog_array_free(struct bpf_prog_array *progs);

2044 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */

2045 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);

2046 int bpf_prog_array_length(struct bpf_prog_array *progs);

2047 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);

2048 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,

2049 __u32 __user *prog_ids, u32 cnt);

2050

2051 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,

2052 struct bpf_prog *old_prog);

2053 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);

2054 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,

2055 struct bpf_prog *prog);

2056 int bpf_prog_array_copy_info(struct bpf_prog_array *array,

2057 u32 *prog_ids, u32 request_cnt,

2058 u32 *prog_cnt);

2059 int bpf_prog_array_copy(struct bpf_prog_array *old_array,

2060 struct bpf_prog *exclude_prog,

2061 struct bpf_prog *include_prog,

2062 u64 bpf_cookie,

2063 struct bpf_prog_array **new_array);

2064

2065 struct bpf_run_ctx {};

2066

2067 struct bpf_cg_run_ctx {

2068 struct bpf_run_ctx run_ctx;

2069 const struct bpf_prog_array_item *prog_item;

2070 int retval;

2071 };

2072

2073 struct bpf_trace_run_ctx {

2074 struct bpf_run_ctx run_ctx;

2075 u64 bpf_cookie;

2076 bool is_uprobe;

2077 };

2078

2079 struct bpf_tramp_run_ctx {

2080 struct bpf_run_ctx run_ctx;

2081 u64 bpf_cookie;

2082 struct bpf_run_ctx *saved_run_ctx;

2083 };

2084

2085 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)

2086 {

2087 struct bpf_run_ctx *old_ctx = NULL;

2088

2089 #ifdef CONFIG_BPF_SYSCALL

2090 old_ctx = current->bpf_ctx;

2091 current->bpf_ctx = new_ctx;

2092 #endif

2093 return old_ctx;

2094 }

2095

2096 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)

2097 {

2098 #ifdef CONFIG_BPF_SYSCALL

2099 current->bpf_ctx = old_ctx;

2100 #endif

2101 }

2102

2103 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */

2104 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)

2105 /* BPF program asks to set CN on the packet. */

2106 #define BPF_RET_SET_CN (1 << 0)

2107

2108 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);

2109

2110 static __always_inline u32

2111 bpf_prog_run_array(const struct bpf_prog_array *array,

2112 const void *ctx, bpf_prog_run_fn run_prog)

2113 {

2114 const struct bpf_prog_array_item *item;

2115 const struct bpf_prog *prog;

2116 struct bpf_run_ctx *old_run_ctx;

2117 struct bpf_trace_run_ctx run_ctx;

2118 u32 ret = 1;

2119

2120 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");

2121

2122 if (unlikely(!array))

2123 return ret;

2124

2125 run_ctx.is_uprobe = false;

2126

2127 migrate_disable();

2128 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);

2129 item = &array->items[0];

2130 while ((prog = READ_ONCE(item->prog))) {

2131 run_ctx.bpf_cookie = item->bpf_cookie;

2132 ret &= run_prog(prog, ctx);

2133 item++;

2134 }

2135 bpf_reset_run_ctx(old_run_ctx);

2136 migrate_enable();

2137 return ret;

2138 }

2139

2140 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:

2141 *

2142 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array

2143 * overall. As a result, we must use the bpf_prog_array_free_sleepable

2144 * in order to use the tasks_trace rcu grace period.

2145 *

2146 * When a non-sleepable program is inside the array, we take the rcu read

2147 * section and disable preemption for that program alone, so it can access

2148 * rcu-protected dynamically sized maps.

2149 */

2150 static __always_inline u32

2151 bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu *array_rcu,

2152 const void *ctx, bpf_prog_run_fn run_prog)

2153 {

2154 const struct bpf_prog_array_item *item;

2155 const struct bpf_prog *prog;

2156 const struct bpf_prog_array *array;

2157 struct bpf_run_ctx *old_run_ctx;

2158 struct bpf_trace_run_ctx run_ctx;

2159 u32 ret = 1;

2160

2161 might_fault();

2162

2163 rcu_read_lock_trace();

2164 migrate_disable();

2165

2166 run_ctx.is_uprobe = true;

2167

2168 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());

2169 if (unlikely(!array))

2170 goto out;

2171 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);

2172 item = &array->items[0];

2173 while ((prog = READ_ONCE(item->prog))) {

2174 if (!prog->sleepable)

2175 rcu_read_lock();

2176

2177 run_ctx.bpf_cookie = item->bpf_cookie;

2178 ret &= run_prog(prog, ctx);

2179 item++;

2180

2181 if (!prog->sleepable)

2182 rcu_read_unlock();

2183 }

2184 bpf_reset_run_ctx(old_run_ctx);

2185 out:

2186 migrate_enable();

2187 rcu_read_unlock_trace();

2188 return ret;

2189 }

2190

2191 #ifdef CONFIG_BPF_SYSCALL

2192 DECLARE_PER_CPU(int, bpf_prog_active);

2193 extern struct mutex bpf_stats_enabled_mutex;

2194

2195 /*

2196 * Block execution of BPF programs attached to instrumentation (perf,

2197 * kprobes, tracepoints) to prevent deadlocks on map operations as any of

2198 * these events can happen inside a region which holds a map bucket lock

2199 * and can deadlock on it.

2200 */

2201 static inline void bpf_disable_instrumentation(void)

2202 {

2203 migrate_disable();

2204 this_cpu_inc(bpf_prog_active);

2205 }

2206

2207 static inline void bpf_enable_instrumentation(void)

2208 {

2209 this_cpu_dec(bpf_prog_active);

2210 migrate_enable();

2211 }

2212

2213 extern const struct super_operations bpf_super_ops;

2214 extern const struct file_operations bpf_map_fops;

2215 extern const struct file_operations bpf_prog_fops;

2216 extern const struct file_operations bpf_iter_fops;

2217

2218 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \

2219 extern const struct bpf_prog_ops _name ## _prog_ops; \

2220 extern const struct bpf_verifier_ops _name ## _verifier_ops;

2221 #define BPF_MAP_TYPE(_id, _ops) \

2222 extern const struct bpf_map_ops _ops;

2223 #define BPF_LINK_TYPE(_id, _name)

2224 #include <linux/bpf_types.h>

2225 #undef BPF_PROG_TYPE

2226 #undef BPF_MAP_TYPE

2227 #undef BPF_LINK_TYPE

2228

2229 extern const struct bpf_prog_ops bpf_offload_prog_ops;

2230 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;

2231 extern const struct bpf_verifier_ops xdp_analyzer_ops;

2232

2233 struct bpf_prog *bpf_prog_get(u32 ufd);

2234 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,

2235 bool attach_drv);

2236 void bpf_prog_add(struct bpf_prog *prog, int i);

2237 void bpf_prog_sub(struct bpf_prog *prog, int i);

2238 void bpf_prog_inc(struct bpf_prog *prog);

2239 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);

2240 void bpf_prog_put(struct bpf_prog *prog);

2241

2242 void bpf_prog_free_id(struct bpf_prog *prog);

2243 void bpf_map_free_id(struct bpf_map *map);

2244

2245 struct btf_field *btf_record_find(const struct btf_record *rec,

2246 u32 offset, u32 field_mask);

2247 void btf_record_free(struct btf_record *rec);

2248 void bpf_map_free_record(struct bpf_map *map);

2249 struct btf_record *btf_record_dup(const struct btf_record *rec);

2250 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);

2251 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);

2252 void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);

2253 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);

2254 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);

2255

2256 struct bpf_map *bpf_map_get(u32 ufd);

2257 struct bpf_map *bpf_map_get_with_uref(u32 ufd);

2258

2259 static inline struct bpf_map *__bpf_map_get(struct fd f)

2260 {

2261 if (fd_empty(f))

2262 return ERR_PTR(-EBADF);

2263 if (unlikely(fd_file(f)->f_op != &bpf_map_fops))

2264 return ERR_PTR(-EINVAL);

2265 return fd_file(f)->private_data;

2266 }

2267

2268 void bpf_map_inc(struct bpf_map *map);

2269 void bpf_map_inc_with_uref(struct bpf_map *map);

2270 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);

2271 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);

2272 void bpf_map_put_with_uref(struct bpf_map *map);

2273 void bpf_map_put(struct bpf_map *map);

2274 void *bpf_map_area_alloc(u64 size, int numa_node);

2275 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);

2276 void bpf_map_area_free(void *base);

2277 bool bpf_map_write_active(const struct bpf_map *map);

2278 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);

2279 int generic_map_lookup_batch(struct bpf_map *map,

2280 const union bpf_attr *attr,

2281 union bpf_attr __user *uattr);

2282 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,

2283 const union bpf_attr *attr,

2284 union bpf_attr __user *uattr);

2285 int generic_map_delete_batch(struct bpf_map *map,

2286 const union bpf_attr *attr,

2287 union bpf_attr __user *uattr);

2288 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);

2289 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);

2290

2291 int bpf_map_alloc_pages(const struct bpf_map *map, gfp_t gfp, int nid,

2292 unsigned long nr_pages, struct page **page_array);

2293 #ifdef CONFIG_MEMCG

2294 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,

2295 int node);

2296 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);

2297 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,

2298 gfp_t flags);

2299 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,

2300 size_t align, gfp_t flags);

2301 #else

2302 /*

2303 * These specialized allocators have to be macros for their allocations to be

2304 * accounted separately (to have separate alloc_tag).

2305 */

2306 #define bpf_map_kmalloc_node(_map, _size, _flags, _node) \

2307 kmalloc_node(_size, _flags, _node)

2308 #define bpf_map_kzalloc(_map, _size, _flags) \

2309 kzalloc(_size, _flags)

2310 #define bpf_map_kvcalloc(_map, _n, _size, _flags) \

2311 kvcalloc(_n, _size, _flags)

2312 #define bpf_map_alloc_percpu(_map, _size, _align, _flags) \

2313 __alloc_percpu_gfp(_size, _align, _flags)

2314 #endif

2315

2316 static inline int

2317 bpf_map_init_elem_count(struct bpf_map *map)

2318 {

2319 size_t size = sizeof(*map->elem_count), align = size;

2320 gfp_t flags = GFP_USER | __GFP_NOWARN;

2321

2322 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);

2323 if (!map->elem_count)

2324 return -ENOMEM;

2325

2326 return 0;

2327 }

2328

2329 static inline void

2330 bpf_map_free_elem_count(struct bpf_map *map)

2331 {

2332 free_percpu(map->elem_count);

2333 }

2334

2335 static inline void bpf_map_inc_elem_count(struct bpf_map *map)

2336 {

2337 this_cpu_inc(*map->elem_count);

2338 }

2339

2340 static inline void bpf_map_dec_elem_count(struct bpf_map *map)

2341 {

2342 this_cpu_dec(*map->elem_count);

2343 }

2344

2345 extern int sysctl_unprivileged_bpf_disabled;

2346

2347 bool bpf_token_capable(const struct bpf_token *token, int cap);

2348

2349 static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token)

2350 {

2351 return bpf_token_capable(token, CAP_PERFMON);

2352 }

2353

2354 static inline bool bpf_allow_uninit_stack(const struct bpf_token *token)

2355 {

2356 return bpf_token_capable(token, CAP_PERFMON);

2357 }

2358

2359 static inline bool bpf_bypass_spec_v1(const struct bpf_token *token)

2360 {

2361 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);

2362 }

2363

2364 static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)

2365 {

2366 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);

2367 }

2368

2369 int bpf_map_new_fd(struct bpf_map *map, int flags);

2370 int bpf_prog_new_fd(struct bpf_prog *prog);

2371

2372 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,

2373 const struct bpf_link_ops *ops, struct bpf_prog *prog);

2374 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);

2375 int bpf_link_settle(struct bpf_link_primer *primer);

2376 void bpf_link_cleanup(struct bpf_link_primer *primer);

2377 void bpf_link_inc(struct bpf_link *link);

2378 struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);

2379 void bpf_link_put(struct bpf_link *link);

2380 int bpf_link_new_fd(struct bpf_link *link);

2381 struct bpf_link *bpf_link_get_from_fd(u32 ufd);

2382 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);

2383

2384 void bpf_token_inc(struct bpf_token *token);

2385 void bpf_token_put(struct bpf_token *token);

2386 int bpf_token_create(union bpf_attr *attr);

2387 struct bpf_token *bpf_token_get_from_fd(u32 ufd);

2388

2389 bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd);

2390 bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type);

2391 bool bpf_token_allow_prog_type(const struct bpf_token *token,

2392 enum bpf_prog_type prog_type,

2393 enum bpf_attach_type attach_type);

2394

2395 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);

2396 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);

2397 struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir,

2398 umode_t mode);

2399

2400 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"

2401 #define DEFINE_BPF_ITER_FUNC(target, args...) \

2402 extern int bpf_iter_ ## target(args); \

2403 int __init bpf_iter_ ## target(args) { return 0; }

2404

2405 /*

2406 * The task type of iterators.

2407 *

2408 * For BPF task iterators, they can be parameterized with various

2409 * parameters to visit only some of tasks.

2410 *

2411 * BPF_TASK_ITER_ALL (default)

2412 * Iterate over resources of every task.

2413 *

2414 * BPF_TASK_ITER_TID

2415 * Iterate over resources of a task/tid.

2416 *

2417 * BPF_TASK_ITER_TGID

2418 * Iterate over resources of every task of a process / task group.

2419 */

2420 enum bpf_iter_task_type {

2421 BPF_TASK_ITER_ALL = 0,

2422 BPF_TASK_ITER_TID,

2423 BPF_TASK_ITER_TGID,

2424 };

2425

2426 struct bpf_iter_aux_info {

2427 /* for map_elem iter */

2428 struct bpf_map *map;

2429

2430 /* for cgroup iter */

2431 struct {

2432 struct cgroup *start; /* starting cgroup */

2433 enum bpf_cgroup_iter_order order;

2434 } cgroup;

2435 struct {

2436 enum bpf_iter_task_type type;

2437 u32 pid;

2438 } task;

2439 };

2440

2441 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,

2442 union bpf_iter_link_info *linfo,

2443 struct bpf_iter_aux_info *aux);

2444 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);

2445 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,

2446 struct seq_file *seq);

2447 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,

2448 struct bpf_link_info *info);

2449 typedef const struct bpf_func_proto *

2450 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,

2451 const struct bpf_prog *prog);

2452

2453 enum bpf_iter_feature {

2454 BPF_ITER_RESCHED = BIT(0),

2455 };

2456

2457 #define BPF_ITER_CTX_ARG_MAX 2

2458 struct bpf_iter_reg {

2459 const char *target;

2460 bpf_iter_attach_target_t attach_target;

2461 bpf_iter_detach_target_t detach_target;

2462 bpf_iter_show_fdinfo_t show_fdinfo;

2463 bpf_iter_fill_link_info_t fill_link_info;

2464 bpf_iter_get_func_proto_t get_func_proto;

2465 u32 ctx_arg_info_size;

2466 u32 feature;

2467 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];

2468 const struct bpf_iter_seq_info *seq_info;

2469 };

2470

2471 struct bpf_iter_meta {

2472 __bpf_md_ptr(struct seq_file *, seq);

2473 u64 session_id;

2474 u64 seq_num;

2475 };

2476

2477 struct bpf_iter__bpf_map_elem {

2478 __bpf_md_ptr(struct bpf_iter_meta *, meta);

2479 __bpf_md_ptr(struct bpf_map *, map);

2480 __bpf_md_ptr(void *, key);

2481 __bpf_md_ptr(void *, value);

2482 };

2483

2484 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);

2485 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);

2486 bool bpf_iter_prog_supported(struct bpf_prog *prog);

2487 const struct bpf_func_proto *

2488 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);

2489 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);

2490 int bpf_iter_new_fd(struct bpf_link *link);

2491 bool bpf_link_is_iter(struct bpf_link *link);

2492 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);

2493 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);

2494 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,

2495 struct seq_file *seq);

2496 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,

2497 struct bpf_link_info *info);

2498

2499 int map_set_for_each_callback_args(struct bpf_verifier_env *env,

2500 struct bpf_func_state *caller,

2501 struct bpf_func_state *callee);

2502

2503 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);

2504 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);

2505 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,

2506 u64 flags);

2507 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,

2508 u64 flags);

2509

2510 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);

2511

2512 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,

2513 void *key, void *value, u64 map_flags);

2514 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);

2515 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,

2516 void *key, void *value, u64 map_flags);

2517 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);

2518

2519 int bpf_get_file_flag(int flags);

2520 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,

2521 size_t actual_size);

2522

2523 /* verify correctness of eBPF program */

2524 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);

2525

2526 #ifndef CONFIG_BPF_JIT_ALWAYS_ON

2527 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);

2528 #endif

2529

2530 struct btf *bpf_get_btf_vmlinux(void);

2531

2532 /* Map specifics */

2533 struct xdp_frame;

2534 struct sk_buff;

2535 struct bpf_dtab_netdev;

2536 struct bpf_cpu_map_entry;

2537

2538 void __dev_flush(struct list_head *flush_list);

2539 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,

2540 struct net_device *dev_rx);

2541 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,

2542 struct net_device *dev_rx);

2543 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,

2544 struct bpf_map *map, bool exclude_ingress);

2545 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,

2546 struct bpf_prog *xdp_prog);

2547 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,

2548 struct bpf_prog *xdp_prog, struct bpf_map *map,

2549 bool exclude_ingress);

2550

2551 void __cpu_map_flush(struct list_head *flush_list);

2552 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,

2553 struct net_device *dev_rx);

2554 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,

2555 struct sk_buff *skb);

2556

2557 /* Return map's numa specified by userspace */

2558 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)

2559 {

2560 return (attr->map_flags & BPF_F_NUMA_NODE) ?

2561 attr->numa_node : NUMA_NO_NODE;

2562 }

2563

2564 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);

2565 int array_map_alloc_check(union bpf_attr *attr);

2566

2567 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,

2568 union bpf_attr __user *uattr);

2569 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,

2570 union bpf_attr __user *uattr);

2571 int bpf_prog_test_run_tracing(struct bpf_prog *prog,

2572 const union bpf_attr *kattr,

2573 union bpf_attr __user *uattr);

2574 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,

2575 const union bpf_attr *kattr,

2576 union bpf_attr __user *uattr);

2577 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,

2578 const union bpf_attr *kattr,

2579 union bpf_attr __user *uattr);

2580 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,

2581 const union bpf_attr *kattr,

2582 union bpf_attr __user *uattr);

2583 int bpf_prog_test_run_nf(struct bpf_prog *prog,

2584 const union bpf_attr *kattr,

2585 union bpf_attr __user *uattr);

2586 bool btf_ctx_access(int off, int size, enum bpf_access_type type,

2587 const struct bpf_prog *prog,

2588 struct bpf_insn_access_aux *info);

2589

2590 static inline bool bpf_tracing_ctx_access(int off, int size,

2591 enum bpf_access_type type)

2592 {

2593 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)

2594 return false;

2595 if (type != BPF_READ)

2596 return false;

2597 if (off % size != 0)

2598 return false;

2599 return true;

2600 }

2601

2602 static inline bool bpf_tracing_btf_ctx_access(int off, int size,

2603 enum bpf_access_type type,

2604 const struct bpf_prog *prog,

2605 struct bpf_insn_access_aux *info)

2606 {

2607 if (!bpf_tracing_ctx_access(off, size, type))

2608 return false;

2609 return btf_ctx_access(off, size, type, prog, info);

2610 }

2611

2612 int btf_struct_access(struct bpf_verifier_log *log,

2613 const struct bpf_reg_state *reg,

2614 int off, int size, enum bpf_access_type atype,

2615 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);

2616 bool btf_struct_ids_match(struct bpf_verifier_log *log,

2617 const struct btf *btf, u32 id, int off,

2618 const struct btf *need_btf, u32 need_type_id,

2619 bool strict);

2620

2621 int btf_distill_func_proto(struct bpf_verifier_log *log,

2622 struct btf *btf,

2623 const struct btf_type *func_proto,

2624 const char *func_name,

2625 struct btf_func_model *m);

2626

2627 struct bpf_reg_state;

2628 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog);

2629 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,

2630 struct btf *btf, const struct btf_type *t);

2631 const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,

2632 int comp_idx, const char *tag_key);

2633 int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,

2634 int comp_idx, const char *tag_key, int last_id);

2635

2636 struct bpf_prog *bpf_prog_by_id(u32 id);

2637 struct bpf_link *bpf_link_by_id(u32 id);

2638

2639 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id,

2640 const struct bpf_prog *prog);

2641 void bpf_task_storage_free(struct task_struct *task);

2642 void bpf_cgrp_storage_free(struct cgroup *cgroup);

2643 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);

2644 const struct btf_func_model *

2645 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,

2646 const struct bpf_insn *insn);

2647 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,

2648 u16 btf_fd_idx, u8 **func_addr);

2649

2650 struct bpf_core_ctx {

2651 struct bpf_verifier_log *log;

2652 const struct btf *btf;

2653 };

2654

2655 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,

2656 const struct bpf_reg_state *reg,

2657 const char *field_name, u32 btf_id, const char *suffix);

2658

2659 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,

2660 const struct btf *reg_btf, u32 reg_id,

2661 const struct btf *arg_btf, u32 arg_id);

2662

2663 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,

2664 int relo_idx, void *insn);

2665

2666 static inline bool unprivileged_ebpf_enabled(void)

2667 {

2668 return !sysctl_unprivileged_bpf_disabled;

2669 }

2670

2671 /* Not all bpf prog type has the bpf_ctx.

2672 * For the bpf prog type that has initialized the bpf_ctx,

2673 * this function can be used to decide if a kernel function

2674 * is called by a bpf program.

2675 */

2676 static inline bool has_current_bpf_ctx(void)

2677 {

2678 return !!current->bpf_ctx;

2679 }

2680

2681 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);

2682

2683 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,

2684 enum bpf_dynptr_type type, u32 offset, u32 size);

2685 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);

2686 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);

2687

2688 #else /* !CONFIG_BPF_SYSCALL */

2689 static inline struct bpf_prog *bpf_prog_get(u32 ufd)

2690 {

2691 return ERR_PTR(-EOPNOTSUPP);

2692 }

2693

2694 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,

2695 enum bpf_prog_type type,

2696 bool attach_drv)

2697 {

2698 return ERR_PTR(-EOPNOTSUPP);

2699 }

2700

2701 static inline void bpf_prog_add(struct bpf_prog *prog, int i)

2702 {

2703 }

2704

2705 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)

2706 {

2707 }

2708

2709 static inline void bpf_prog_put(struct bpf_prog *prog)

2710 {

2711 }

2712

2713 static inline void bpf_prog_inc(struct bpf_prog *prog)

2714 {

2715 }

2716

2717 static inline struct bpf_prog *__must_check

2718 bpf_prog_inc_not_zero(struct bpf_prog *prog)

2719 {

2720 return ERR_PTR(-EOPNOTSUPP);

2721 }

2722

2723 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,

2724 const struct bpf_link_ops *ops,

2725 struct bpf_prog *prog)

2726 {

2727 }

2728

2729 static inline int bpf_link_prime(struct bpf_link *link,

2730 struct bpf_link_primer *primer)

2731 {

2732 return -EOPNOTSUPP;

2733 }

2734

2735 static inline int bpf_link_settle(struct bpf_link_primer *primer)

2736 {

2737 return -EOPNOTSUPP;

2738 }

2739

2740 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)

2741 {

2742 }

2743

2744 static inline void bpf_link_inc(struct bpf_link *link)

2745 {

2746 }

2747

2748 static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)

2749 {

2750 return NULL;

2751 }

2752

2753 static inline void bpf_link_put(struct bpf_link *link)

2754 {

2755 }

2756

2757 static inline int bpf_obj_get_user(const char __user *pathname, int flags)

2758 {

2759 return -EOPNOTSUPP;

2760 }

2761

2762 static inline bool bpf_token_capable(const struct bpf_token *token, int cap)

2763 {

2764 return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));

2765 }

2766

2767 static inline void bpf_token_inc(struct bpf_token *token)

2768 {

2769 }

2770

2771 static inline void bpf_token_put(struct bpf_token *token)

2772 {

2773 }

2774

2775 static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd)

2776 {

2777 return ERR_PTR(-EOPNOTSUPP);

2778 }

2779

2780 static inline void __dev_flush(struct list_head *flush_list)

2781 {

2782 }

2783

2784 struct xdp_frame;

2785 struct bpf_dtab_netdev;

2786 struct bpf_cpu_map_entry;

2787

2788 static inline

2789 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,

2790 struct net_device *dev_rx)

2791 {

2792 return 0;

2793 }

2794

2795 static inline

2796 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,

2797 struct net_device *dev_rx)

2798 {

2799 return 0;

2800 }

2801

2802 static inline

2803 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,

2804 struct bpf_map *map, bool exclude_ingress)

2805 {

2806 return 0;

2807 }

2808

2809 struct sk_buff;

2810

2811 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,

2812 struct sk_buff *skb,

2813 struct bpf_prog *xdp_prog)

2814 {

2815 return 0;

2816 }

2817

2818 static inline

2819 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,

2820 struct bpf_prog *xdp_prog, struct bpf_map *map,

2821 bool exclude_ingress)

2822 {

2823 return 0;

2824 }

2825

2826 static inline void __cpu_map_flush(struct list_head *flush_list)

2827 {

2828 }

2829

2830 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,

2831 struct xdp_frame *xdpf,

2832 struct net_device *dev_rx)

2833 {

2834 return 0;

2835 }

2836

2837 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,

2838 struct sk_buff *skb)

2839 {

2840 return -EOPNOTSUPP;

2841 }

2842

2843 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,

2844 enum bpf_prog_type type)

2845 {

2846 return ERR_PTR(-EOPNOTSUPP);

2847 }

2848

2849 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,

2850 const union bpf_attr *kattr,

2851 union bpf_attr __user *uattr)

2852 {

2853 return -ENOTSUPP;

2854 }

2855

2856 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,

2857 const union bpf_attr *kattr,

2858 union bpf_attr __user *uattr)

2859 {

2860 return -ENOTSUPP;

2861 }

2862

2863 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,

2864 const union bpf_attr *kattr,

2865 union bpf_attr __user *uattr)

2866 {

2867 return -ENOTSUPP;

2868 }

2869

2870 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,

2871 const union bpf_attr *kattr,

2872 union bpf_attr __user *uattr)

2873 {

2874 return -ENOTSUPP;

2875 }

2876

2877 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,

2878 const union bpf_attr *kattr,

2879 union bpf_attr __user *uattr)

2880 {

2881 return -ENOTSUPP;

2882 }

2883

2884 static inline void bpf_map_put(struct bpf_map *map)

2885 {

2886 }

2887

2888 static inline struct bpf_prog *bpf_prog_by_id(u32 id)

2889 {

2890 return ERR_PTR(-ENOTSUPP);

2891 }

2892

2893 static inline int btf_struct_access(struct bpf_verifier_log *log,

2894 const struct bpf_reg_state *reg,

2895 int off, int size, enum bpf_access_type atype,

2896 u32 *next_btf_id, enum bpf_type_flag *flag,

2897 const char **field_name)

2898 {

2899 return -EACCES;

2900 }

2901

2902 static inline const struct bpf_func_proto *

2903 bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)

2904 {

2905 return NULL;

2906 }

2907

2908 static inline void bpf_task_storage_free(struct task_struct *task)

2909 {

2910 }

2911

2912 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)

2913 {

2914 return false;

2915 }

2916

2917 static inline const struct btf_func_model *

2918 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,

2919 const struct bpf_insn *insn)

2920 {

2921 return NULL;

2922 }

2923

2924 static inline int

2925 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,

2926 u16 btf_fd_idx, u8 **func_addr)

2927 {

2928 return -ENOTSUPP;

2929 }

2930

2931 static inline bool unprivileged_ebpf_enabled(void)

2932 {

2933 return false;

2934 }

2935

2936 static inline bool has_current_bpf_ctx(void)

2937 {

2938 return false;

2939 }

2940

2941 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)

2942 {

2943 }

2944

2945 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)

2946 {

2947 }

2948

2949 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,

2950 enum bpf_dynptr_type type, u32 offset, u32 size)

2951 {

2952 }

2953

2954 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)

2955 {

2956 }

2957

2958 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)

2959 {

2960 }

2961 #endif /* CONFIG_BPF_SYSCALL */

2962

2963 static __always_inline int

2964 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)

2965 {

2966 int ret = -EFAULT;

2967

2968 if (IS_ENABLED(CONFIG_BPF_EVENTS))

2969 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);

2970 if (unlikely(ret < 0))

2971 memset(dst, 0, size);

2972 return ret;

2973 }

2974

2975 void __bpf_free_used_btfs(struct btf_mod_pair *used_btfs, u32 len);

2976

2977 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,

2978 enum bpf_prog_type type)

2979 {

2980 return bpf_prog_get_type_dev(ufd, type, false);

2981 }

2982

2983 void __bpf_free_used_maps(struct bpf_prog_aux *aux,

2984 struct bpf_map **used_maps, u32 len);

2985

2986 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);

2987

2988 int bpf_prog_offload_compile(struct bpf_prog *prog);

2989 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);

2990 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,

2991 struct bpf_prog *prog);

2992

2993 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);

2994

2995 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);

2996 int bpf_map_offload_update_elem(struct bpf_map *map,

2997 void *key, void *value, u64 flags);

2998 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);

2999 int bpf_map_offload_get_next_key(struct bpf_map *map,

3000 void *key, void *next_key);

3001

3002 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);

3003

3004 struct bpf_offload_dev *

3005 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);

3006 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);

3007 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);

3008 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,

3009 struct net_device *netdev);

3010 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,

3011 struct net_device *netdev);

3012 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);

3013

3014 void unpriv_ebpf_notify(int new_state);

3015

3016 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)

3017 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,

3018 struct bpf_prog_aux *prog_aux);

3019 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);

3020 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);

3021 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);

3022 void bpf_dev_bound_netdev_unregister(struct net_device *dev);

3023

3024 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)

3025 {

3026 return aux->dev_bound;

3027 }

3028

3029 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)

3030 {

3031 return aux->offload_requested;

3032 }

3033

3034 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);

3035

3036 static inline bool bpf_map_is_offloaded(struct bpf_map *map)

3037 {

3038 return unlikely(map->ops == &bpf_map_offload_ops);

3039 }

3040

3041 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);

3042 void bpf_map_offload_map_free(struct bpf_map *map);

3043 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);

3044 int bpf_prog_test_run_syscall(struct bpf_prog *prog,

3045 const union bpf_attr *kattr,

3046 union bpf_attr __user *uattr);

3047

3048 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);

3049 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);

3050 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);

3051 int sock_map_bpf_prog_query(const union bpf_attr *attr,

3052 union bpf_attr __user *uattr);

3053 int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog);

3054

3055 void sock_map_unhash(struct sock *sk);

3056 void sock_map_destroy(struct sock *sk);

3057 void sock_map_close(struct sock *sk, long timeout);

3058 #else

3059 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,

3060 struct bpf_prog_aux *prog_aux)

3061 {

3062 return -EOPNOTSUPP;

3063 }

3064

3065 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,

3066 u32 func_id)

3067 {

3068 return NULL;

3069 }

3070

3071 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,

3072 union bpf_attr *attr)

3073 {

3074 return -EOPNOTSUPP;

3075 }

3076

3077 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,

3078 struct bpf_prog *old_prog)

3079 {

3080 return -EOPNOTSUPP;

3081 }

3082

3083 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)

3084 {

3085 }

3086

3087 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)

3088 {

3089 return false;

3090 }

3091

3092 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)

3093 {

3094 return false;

3095 }

3096

3097 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)

3098 {

3099 return false;

3100 }

3101

3102 static inline bool bpf_map_is_offloaded(struct bpf_map *map)

3103 {

3104 return false;

3105 }

3106

3107 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)

3108 {

3109 return ERR_PTR(-EOPNOTSUPP);

3110 }

3111

3112 static inline void bpf_map_offload_map_free(struct bpf_map *map)

3113 {

3114 }

3115

3116 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)

3117 {

3118 return 0;

3119 }

3120

3121 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,

3122 const union bpf_attr *kattr,

3123 union bpf_attr __user *uattr)

3124 {

3125 return -ENOTSUPP;

3126 }

3127

3128 #ifdef CONFIG_BPF_SYSCALL

3129 static inline int sock_map_get_from_fd(const union bpf_attr *attr,

3130 struct bpf_prog *prog)

3131 {

3132 return -EINVAL;

3133 }

3134

3135 static inline int sock_map_prog_detach(const union bpf_attr *attr,

3136 enum bpf_prog_type ptype)

3137 {

3138 return -EOPNOTSUPP;

3139 }

3140

3141 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,

3142 u64 flags)

3143 {

3144 return -EOPNOTSUPP;

3145 }

3146

3147 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,

3148 union bpf_attr __user *uattr)

3149 {

3150 return -EINVAL;

3151 }

3152

3153 static inline int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)

3154 {

3155 return -EOPNOTSUPP;

3156 }

3157 #endif /* CONFIG_BPF_SYSCALL */

3158 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */

3159

3160 static __always_inline void

3161 bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)

3162 {

3163 const struct bpf_prog_array_item *item;

3164 struct bpf_prog *prog;

3165

3166 if (unlikely(!array))

3167 return;

3168

3169 item = &array->items[0];

3170 while ((prog = READ_ONCE(item->prog))) {

3171 bpf_prog_inc_misses_counter(prog);

3172 item++;

3173 }

3174 }

3175

3176 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)

3177 void bpf_sk_reuseport_detach(struct sock *sk);

3178 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,

3179 void *value);

3180 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,

3181 void *value, u64 map_flags);

3182 #else

3183 static inline void bpf_sk_reuseport_detach(struct sock *sk)

3184 {

3185 }

3186

3187 #ifdef CONFIG_BPF_SYSCALL

3188 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,

3189 void *key, void *value)

3190 {

3191 return -EOPNOTSUPP;

3192 }

3193

3194 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,

3195 void *key, void *value,

3196 u64 map_flags)

3197 {

3198 return -EOPNOTSUPP;

3199 }

3200 #endif /* CONFIG_BPF_SYSCALL */

3201 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */

3202

3203 /* verifier prototypes for helper functions called from eBPF programs */

3204 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;

3205 extern const struct bpf_func_proto bpf_map_update_elem_proto;

3206 extern const struct bpf_func_proto bpf_map_delete_elem_proto;

3207 extern const struct bpf_func_proto bpf_map_push_elem_proto;

3208 extern const struct bpf_func_proto bpf_map_pop_elem_proto;

3209 extern const struct bpf_func_proto bpf_map_peek_elem_proto;

3210 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;

3211

3212 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;

3213 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;

3214 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;

3215 extern const struct bpf_func_proto bpf_tail_call_proto;

3216 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;

3217 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;

3218 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;

3219 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;

3220 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;

3221 extern const struct bpf_func_proto bpf_get_current_comm_proto;

3222 extern const struct bpf_func_proto bpf_get_stackid_proto;

3223 extern const struct bpf_func_proto bpf_get_stack_proto;

3224 extern const struct bpf_func_proto bpf_get_stack_sleepable_proto;

3225 extern const struct bpf_func_proto bpf_get_task_stack_proto;

3226 extern const struct bpf_func_proto bpf_get_task_stack_sleepable_proto;

3227 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;

3228 extern const struct bpf_func_proto bpf_get_stack_proto_pe;

3229 extern const struct bpf_func_proto bpf_sock_map_update_proto;

3230 extern const struct bpf_func_proto bpf_sock_hash_update_proto;

3231 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;

3232 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;

3233 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;

3234 extern const struct bpf_func_proto bpf_current_task_under_cgroup_proto;

3235 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;

3236 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;

3237 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;

3238 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;

3239 extern const struct bpf_func_proto bpf_spin_lock_proto;

3240 extern const struct bpf_func_proto bpf_spin_unlock_proto;

3241 extern const struct bpf_func_proto bpf_get_local_storage_proto;

3242 extern const struct bpf_func_proto bpf_strtol_proto;

3243 extern const struct bpf_func_proto bpf_strtoul_proto;

3244 extern const struct bpf_func_proto bpf_tcp_sock_proto;

3245 extern const struct bpf_func_proto bpf_jiffies64_proto;

3246 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;

3247 extern const struct bpf_func_proto bpf_event_output_data_proto;

3248 extern const struct bpf_func_proto bpf_ringbuf_output_proto;

3249 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;

3250 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;

3251 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;

3252 extern const struct bpf_func_proto bpf_ringbuf_query_proto;

3253 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;

3254 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;

3255 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;

3256 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;

3257 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;

3258 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;

3259 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;

3260 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;

3261 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;

3262 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;

3263 extern const struct bpf_func_proto bpf_copy_from_user_proto;

3264 extern const struct bpf_func_proto bpf_snprintf_btf_proto;

3265 extern const struct bpf_func_proto bpf_snprintf_proto;

3266 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;

3267 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;

3268 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;

3269 extern const struct bpf_func_proto bpf_sock_from_file_proto;

3270 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;

3271 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;

3272 extern const struct bpf_func_proto bpf_task_storage_get_proto;

3273 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;

3274 extern const struct bpf_func_proto bpf_task_storage_delete_proto;

3275 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;

3276 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;

3277 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;

3278 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;

3279 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;

3280 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;

3281 extern const struct bpf_func_proto bpf_find_vma_proto;

3282 extern const struct bpf_func_proto bpf_loop_proto;

3283 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;

3284 extern const struct bpf_func_proto bpf_set_retval_proto;

3285 extern const struct bpf_func_proto bpf_get_retval_proto;

3286 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;

3287 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;

3288 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;

3289

3290 const struct bpf_func_proto *tracing_prog_func_proto(

3291 enum bpf_func_id func_id, const struct bpf_prog *prog);

3292

3293 /* Shared helpers among cBPF and eBPF. */

3294 void bpf_user_rnd_init_once(void);

3295 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);

3296 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);

3297

3298 #if defined(CONFIG_NET)

3299 bool bpf_sock_common_is_valid_access(int off, int size,

3300 enum bpf_access_type type,

3301 struct bpf_insn_access_aux *info);

3302 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,

3303 struct bpf_insn_access_aux *info);

3304 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,

3305 const struct bpf_insn *si,

3306 struct bpf_insn *insn_buf,

3307 struct bpf_prog *prog,

3308 u32 *target_size);

3309 int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,

3310 struct bpf_dynptr *ptr);

3311 #else

3312 static inline bool bpf_sock_common_is_valid_access(int off, int size,

3313 enum bpf_access_type type,

3314 struct bpf_insn_access_aux *info)

3315 {

3316 return false;

3317 }

3318 static inline bool bpf_sock_is_valid_access(int off, int size,

3319 enum bpf_access_type type,

3320 struct bpf_insn_access_aux *info)

3321 {

3322 return false;

3323 }

3324 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,

3325 const struct bpf_insn *si,

3326 struct bpf_insn *insn_buf,

3327 struct bpf_prog *prog,

3328 u32 *target_size)

3329 {

3330 return 0;

3331 }

3332 static inline int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,

3333 struct bpf_dynptr *ptr)

3334 {

3335 return -EOPNOTSUPP;

3336 }

3337 #endif

3338

3339 #ifdef CONFIG_INET

3340 struct sk_reuseport_kern {

3341 struct sk_buff *skb;

3342 struct sock *sk;

3343 struct sock *selected_sk;

3344 struct sock *migrating_sk;

3345 void *data_end;

3346 u32 hash;

3347 u32 reuseport_id;

3348 bool bind_inany;

3349 };

3350 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,

3351 struct bpf_insn_access_aux *info);

3352

3353 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,

3354 const struct bpf_insn *si,

3355 struct bpf_insn *insn_buf,

3356 struct bpf_prog *prog,

3357 u32 *target_size);

3358

3359 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,

3360 struct bpf_insn_access_aux *info);

3361

3362 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,

3363 const struct bpf_insn *si,

3364 struct bpf_insn *insn_buf,

3365 struct bpf_prog *prog,

3366 u32 *target_size);

3367 #else

3368 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,

3369 enum bpf_access_type type,

3370 struct bpf_insn_access_aux *info)

3371 {

3372 return false;

3373 }

3374

3375 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,

3376 const struct bpf_insn *si,

3377 struct bpf_insn *insn_buf,

3378 struct bpf_prog *prog,

3379 u32 *target_size)

3380 {

3381 return 0;

3382 }

3383 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,

3384 enum bpf_access_type type,

3385 struct bpf_insn_access_aux *info)

3386 {

3387 return false;

3388 }

3389

3390 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,

3391 const struct bpf_insn *si,

3392 struct bpf_insn *insn_buf,

3393 struct bpf_prog *prog,

3394 u32 *target_size)

3395 {

3396 return 0;

3397 }

3398 #endif /* CONFIG_INET */

3399

3400 enum bpf_text_poke_type {

3401 BPF_MOD_CALL,

3402 BPF_MOD_JUMP,

3403 };

3404

3405 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,

3406 void *addr1, void *addr2);

3407

3408 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,

3409 struct bpf_prog *new, struct bpf_prog *old);

3410

3411 void *bpf_arch_text_copy(void *dst, void *src, size_t len);

3412 int bpf_arch_text_invalidate(void *dst, size_t len);

3413

3414 struct btf_id_set;

3415 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);

3416

3417 #define MAX_BPRINTF_VARARGS 12

3418 #define MAX_BPRINTF_BUF 1024

3419

3420 struct bpf_bprintf_data {

3421 u32 *bin_args;

3422 char *buf;

3423 bool get_bin_args;

3424 bool get_buf;

3425 };

3426

3427 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,

3428 u32 num_args, struct bpf_bprintf_data *data);

3429 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);

3430

3431 #ifdef CONFIG_BPF_LSM

3432 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);

3433 void bpf_cgroup_atype_put(int cgroup_atype);

3434 #else

3435 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}

3436 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}

3437 #endif /* CONFIG_BPF_LSM */

3438

3439 struct key;

3440

3441 #ifdef CONFIG_KEYS

3442 struct bpf_key {

3443 struct key *key;

3444 bool has_ref;

3445 };

3446 #endif /* CONFIG_KEYS */

3447

3448 static inline bool type_is_alloc(u32 type)

3449 {

3450 return type & MEM_ALLOC;

3451 }

3452

3453 static inline gfp_t bpf_memcg_flags(gfp_t flags)

3454 {

3455 if (memcg_bpf_enabled())

3456 return flags | __GFP_ACCOUNT;

3457 return flags;

3458 }

3459

3460 static inline bool bpf_is_subprog(const struct bpf_prog *prog)

3461 {

3462 return prog->aux->func_idx != 0;

3463 }

3464

3465 #endif /* _LINUX_BPF_H */