1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 */
4 #ifndef _LINUX_BPF_H
5 #define _LINUX_BPF_H 1
6
7 #include <uapi/linux/bpf.h>
8
9 #include <linux/workqueue.h>
10 #include <linux/file.h>
11 #include <linux/percpu.h>
12 #include <linux/err.h>
13 #include <linux/rbtree_latch.h>
14 #include <linux/numa.h>
15 #include <linux/mm_types.h>
16 #include <linux/wait.h>
17 #include <linux/refcount.h>
18 #include <linux/mutex.h>
19 #include <linux/module.h>
20 #include <linux/kallsyms.h>
21 #include <linux/capability.h>
22 #include <linux/sched/mm.h>
23 #include <linux/slab.h>
24 #include <linux/percpu-refcount.h>
25 #include <linux/bpfptr.h>
26 #include <linux/android_kabi.h>
27
28 struct bpf_verifier_env;
29 struct bpf_verifier_log;
30 struct perf_event;
31 struct bpf_prog;
32 struct bpf_prog_aux;
33 struct bpf_map;
34 struct sock;
35 struct seq_file;
36 struct btf;
37 struct btf_type;
38 struct exception_table_entry;
39 struct seq_operations;
40 struct bpf_iter_aux_info;
41 struct bpf_local_storage;
42 struct bpf_local_storage_map;
43 struct kobject;
44 struct mem_cgroup;
45 struct module;
46 struct bpf_func_state;
47
48 extern struct idr btf_idr;
49 extern spinlock_t btf_idr_lock;
50 extern struct kobject *btf_kobj;
51
52 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
53 struct bpf_iter_aux_info *aux);
54 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
55 struct bpf_iter_seq_info {
56 const struct seq_operations *seq_ops;
57 bpf_iter_init_seq_priv_t init_seq_private;
58 bpf_iter_fini_seq_priv_t fini_seq_private;
59 u32 seq_priv_size;
60 };
61
62 /* map is generic key/value storage optionally accessible by eBPF programs */
63 struct bpf_map_ops {
64 /* funcs callable from userspace (via syscall) */
65 int (*map_alloc_check)(union bpf_attr *attr);
66 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
67 void (*map_release)(struct bpf_map *map, struct file *map_file);
68 void (*map_free)(struct bpf_map *map);
69 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
70 void (*map_release_uref)(struct bpf_map *map);
71 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
72 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
73 union bpf_attr __user *uattr);
74 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
75 void *value, u64 flags);
76 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
77 const union bpf_attr *attr,
78 union bpf_attr __user *uattr);
79 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
80 union bpf_attr __user *uattr);
81 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
82 union bpf_attr __user *uattr);
83
84 /* funcs callable from userspace and from eBPF programs */
85 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
86 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
87 int (*map_delete_elem)(struct bpf_map *map, void *key);
88 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
89 int (*map_pop_elem)(struct bpf_map *map, void *value);
90 int (*map_peek_elem)(struct bpf_map *map, void *value);
91
92 /* funcs called by prog_array and perf_event_array map */
93 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
94 int fd);
95 void (*map_fd_put_ptr)(void *ptr);
96 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
97 u32 (*map_fd_sys_lookup_elem)(void *ptr);
98 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
99 struct seq_file *m);
100 int (*map_check_btf)(const struct bpf_map *map,
101 const struct btf *btf,
102 const struct btf_type *key_type,
103 const struct btf_type *value_type);
104
105 /* Prog poke tracking helpers. */
106 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
107 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
108 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
109 struct bpf_prog *new);
110
111 /* Direct value access helpers. */
112 int (*map_direct_value_addr)(const struct bpf_map *map,
113 u64 *imm, u32 off);
114 int (*map_direct_value_meta)(const struct bpf_map *map,
115 u64 imm, u32 *off);
116 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
117 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
118 struct poll_table_struct *pts);
119
120 /* Functions called by bpf_local_storage maps */
121 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
122 void *owner, u32 size);
123 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
124 void *owner, u32 size);
125 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
126
127 /* Misc helpers.*/
128 int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags);
129
130 /* map_meta_equal must be implemented for maps that can be
131 * used as an inner map. It is a runtime check to ensure
132 * an inner map can be inserted to an outer map.
133 *
134 * Some properties of the inner map has been used during the
135 * verification time. When inserting an inner map at the runtime,
136 * map_meta_equal has to ensure the inserting map has the same
137 * properties that the verifier has used earlier.
138 */
139 bool (*map_meta_equal)(const struct bpf_map *meta0,
140 const struct bpf_map *meta1);
141
142
143 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
144 struct bpf_func_state *caller,
145 struct bpf_func_state *callee);
146 int (*map_for_each_callback)(struct bpf_map *map, void *callback_fn,
147 void *callback_ctx, u64 flags);
148
149 /* BTF name and id of struct allocated by map_alloc */
150 const char * const map_btf_name;
151 int *map_btf_id;
152
153 /* bpf_iter info used to open a seq_file */
154 const struct bpf_iter_seq_info *iter_seq_info;
155
156 ANDROID_KABI_RESERVE(1);
157 ANDROID_KABI_RESERVE(2);
158 };
159
160 struct bpf_map {
161 /* The first two cachelines with read-mostly members of which some
162 * are also accessed in fast-path (e.g. ops, max_entries).
163 */
164 const struct bpf_map_ops *ops ____cacheline_aligned;
165 struct bpf_map *inner_map_meta;
166 #ifdef CONFIG_SECURITY
167 void *security;
168 #endif
169 enum bpf_map_type map_type;
170 u32 key_size;
171 u32 value_size;
172 u32 max_entries;
173 u32 map_flags;
174 int spin_lock_off; /* >=0 valid offset, <0 error */
175 int timer_off; /* >=0 valid offset, <0 error */
176 u32 id;
177 int numa_node;
178 u32 btf_key_type_id;
179 u32 btf_value_type_id;
180 struct btf *btf;
181 #ifdef CONFIG_MEMCG_KMEM
182 struct mem_cgroup *memcg;
183 #endif
184 char name[BPF_OBJ_NAME_LEN];
185 u32 btf_vmlinux_value_type_id;
186 bool bypass_spec_v1;
187 bool frozen; /* write-once; write-protected by freeze_mutex */
188 /* 22 bytes hole */
189
190 /* The 3rd and 4th cacheline with misc members to avoid false sharing
191 * particularly with refcounting.
192 */
193 atomic64_t refcnt ____cacheline_aligned;
194 atomic64_t usercnt;
195 struct work_struct work;
196 struct mutex freeze_mutex;
197 atomic64_t writecnt;
198 };
199
map_value_has_spin_lock(const struct bpf_map * map)200 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
201 {
202 return map->spin_lock_off >= 0;
203 }
204
map_value_has_timer(const struct bpf_map * map)205 static inline bool map_value_has_timer(const struct bpf_map *map)
206 {
207 return map->timer_off >= 0;
208 }
209
check_and_init_map_value(struct bpf_map * map,void * dst)210 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
211 {
212 if (unlikely(map_value_has_spin_lock(map)))
213 memset(dst + map->spin_lock_off, 0, sizeof(struct bpf_spin_lock));
214 if (unlikely(map_value_has_timer(map)))
215 memset(dst + map->timer_off, 0, sizeof(struct bpf_timer));
216 }
217
218 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */
copy_map_value(struct bpf_map * map,void * dst,void * src)219 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
220 {
221 u32 s_off = 0, s_sz = 0, t_off = 0, t_sz = 0;
222
223 if (unlikely(map_value_has_spin_lock(map))) {
224 s_off = map->spin_lock_off;
225 s_sz = sizeof(struct bpf_spin_lock);
226 }
227 if (unlikely(map_value_has_timer(map))) {
228 t_off = map->timer_off;
229 t_sz = sizeof(struct bpf_timer);
230 }
231
232 if (unlikely(s_sz || t_sz)) {
233 if (s_off < t_off || !s_sz) {
234 swap(s_off, t_off);
235 swap(s_sz, t_sz);
236 }
237 memcpy(dst, src, t_off);
238 memcpy(dst + t_off + t_sz,
239 src + t_off + t_sz,
240 s_off - t_off - t_sz);
241 memcpy(dst + s_off + s_sz,
242 src + s_off + s_sz,
243 map->value_size - s_off - s_sz);
244 } else {
245 memcpy(dst, src, map->value_size);
246 }
247 }
248 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
249 bool lock_src);
250 void bpf_timer_cancel_and_free(void *timer);
251 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
252
253 struct bpf_offload_dev;
254 struct bpf_offloaded_map;
255
256 struct bpf_map_dev_ops {
257 int (*map_get_next_key)(struct bpf_offloaded_map *map,
258 void *key, void *next_key);
259 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
260 void *key, void *value);
261 int (*map_update_elem)(struct bpf_offloaded_map *map,
262 void *key, void *value, u64 flags);
263 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
264
265 ANDROID_KABI_RESERVE(1);
266 };
267
268 struct bpf_offloaded_map {
269 struct bpf_map map;
270 struct net_device *netdev;
271 const struct bpf_map_dev_ops *dev_ops;
272 void *dev_priv;
273 struct list_head offloads;
274 };
275
map_to_offmap(struct bpf_map * map)276 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
277 {
278 return container_of(map, struct bpf_offloaded_map, map);
279 }
280
bpf_map_offload_neutral(const struct bpf_map * map)281 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
282 {
283 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
284 }
285
bpf_map_support_seq_show(const struct bpf_map * map)286 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
287 {
288 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
289 map->ops->map_seq_show_elem;
290 }
291
292 int map_check_no_btf(const struct bpf_map *map,
293 const struct btf *btf,
294 const struct btf_type *key_type,
295 const struct btf_type *value_type);
296
297 bool bpf_map_meta_equal(const struct bpf_map *meta0,
298 const struct bpf_map *meta1);
299
300 extern const struct bpf_map_ops bpf_map_offload_ops;
301
302 /* bpf_type_flag contains a set of flags that are applicable to the values of
303 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
304 * or a memory is read-only. We classify types into two categories: base types
305 * and extended types. Extended types are base types combined with a type flag.
306 *
307 * Currently there are no more than 32 base types in arg_type, ret_type and
308 * reg_types.
309 */
310 #define BPF_BASE_TYPE_BITS 8
311
312 enum bpf_type_flag {
313 /* PTR may be NULL. */
314 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
315
316 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
317 * compatible with both mutable and immutable memory.
318 */
319 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
320
321 __BPF_TYPE_LAST_FLAG = MEM_RDONLY,
322 };
323
324 /* Max number of base types. */
325 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
326
327 /* Max number of all types. */
328 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
329
330 /* function argument constraints */
331 enum bpf_arg_type {
332 ARG_DONTCARE = 0, /* unused argument in helper function */
333
334 /* the following constraints used to prototype
335 * bpf_map_lookup/update/delete_elem() functions
336 */
337 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
338 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
339 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
340 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
341
342 /* the following constraints used to prototype bpf_memcmp() and other
343 * functions that access data on eBPF program stack
344 */
345 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
346 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
347 * helper function must fill all bytes or clear
348 * them in error case.
349 */
350
351 ARG_CONST_SIZE, /* number of bytes accessed from memory */
352 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
353
354 ARG_PTR_TO_CTX, /* pointer to context */
355 ARG_ANYTHING, /* any (initialized) argument is ok */
356 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
357 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
358 ARG_PTR_TO_INT, /* pointer to int */
359 ARG_PTR_TO_LONG, /* pointer to long */
360 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
361 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
362 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
363 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
364 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
365 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
366 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
367 ARG_PTR_TO_STACK, /* pointer to stack */
368 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
369 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
370 __BPF_ARG_TYPE_MAX,
371
372 /* Extended arg_types. */
373 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
374 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
375 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
376 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
377 ARG_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM,
378 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
379
380 /* This must be the last entry. Its purpose is to ensure the enum is
381 * wide enough to hold the higher bits reserved for bpf_type_flag.
382 */
383 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
384 };
385 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
386
387 /* type of values returned from helper functions */
388 enum bpf_return_type {
389 RET_INTEGER, /* function returns integer */
390 RET_VOID, /* function doesn't return anything */
391 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
392 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
393 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
394 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
395 RET_PTR_TO_ALLOC_MEM, /* returns a pointer to dynamically allocated memory */
396 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
397 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
398 __BPF_RET_TYPE_MAX,
399
400 /* Extended ret_types. */
401 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
402 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
403 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
404 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
405 RET_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_ALLOC_MEM,
406 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
407
408 /* This must be the last entry. Its purpose is to ensure the enum is
409 * wide enough to hold the higher bits reserved for bpf_type_flag.
410 */
411 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
412 };
413 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
414
415 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
416 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
417 * instructions after verifying
418 */
419 struct bpf_func_proto {
420 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
421 bool gpl_only;
422 bool pkt_access;
423 enum bpf_return_type ret_type;
424 union {
425 struct {
426 enum bpf_arg_type arg1_type;
427 enum bpf_arg_type arg2_type;
428 enum bpf_arg_type arg3_type;
429 enum bpf_arg_type arg4_type;
430 enum bpf_arg_type arg5_type;
431 };
432 enum bpf_arg_type arg_type[5];
433 };
434 union {
435 struct {
436 u32 *arg1_btf_id;
437 u32 *arg2_btf_id;
438 u32 *arg3_btf_id;
439 u32 *arg4_btf_id;
440 u32 *arg5_btf_id;
441 };
442 u32 *arg_btf_id[5];
443 };
444 int *ret_btf_id; /* return value btf_id */
445 bool (*allowed)(const struct bpf_prog *prog);
446 };
447
448 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
449 * the first argument to eBPF programs.
450 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
451 */
452 struct bpf_context;
453
454 enum bpf_access_type {
455 BPF_READ = 1,
456 BPF_WRITE = 2
457 };
458
459 /* types of values stored in eBPF registers */
460 /* Pointer types represent:
461 * pointer
462 * pointer + imm
463 * pointer + (u16) var
464 * pointer + (u16) var + imm
465 * if (range > 0) then [ptr, ptr + range - off) is safe to access
466 * if (id > 0) means that some 'var' was added
467 * if (off > 0) means that 'imm' was added
468 */
469 enum bpf_reg_type {
470 NOT_INIT = 0, /* nothing was written into register */
471 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
472 PTR_TO_CTX, /* reg points to bpf_context */
473 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
474 PTR_TO_MAP_VALUE, /* reg points to map element value */
475 PTR_TO_MAP_KEY, /* reg points to a map element key */
476 PTR_TO_STACK, /* reg == frame_pointer + offset */
477 PTR_TO_PACKET_META, /* skb->data - meta_len */
478 PTR_TO_PACKET, /* reg points to skb->data */
479 PTR_TO_PACKET_END, /* skb->data + headlen */
480 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
481 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
482 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
483 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
484 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
485 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
486 /* PTR_TO_BTF_ID points to a kernel struct that does not need
487 * to be null checked by the BPF program. This does not imply the
488 * pointer is _not_ null and in practice this can easily be a null
489 * pointer when reading pointer chains. The assumption is program
490 * context will handle null pointer dereference typically via fault
491 * handling. The verifier must keep this in mind and can make no
492 * assumptions about null or non-null when doing branch analysis.
493 * Further, when passed into helpers the helpers can not, without
494 * additional context, assume the value is non-null.
495 */
496 PTR_TO_BTF_ID,
497 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
498 * been checked for null. Used primarily to inform the verifier
499 * an explicit null check is required for this struct.
500 */
501 PTR_TO_MEM, /* reg points to valid memory region */
502 PTR_TO_BUF, /* reg points to a read/write buffer */
503 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */
504 PTR_TO_FUNC, /* reg points to a bpf program function */
505 __BPF_REG_TYPE_MAX,
506
507 /* Extended reg_types. */
508 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
509 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
510 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
511 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
512 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
513
514 /* This must be the last entry. Its purpose is to ensure the enum is
515 * wide enough to hold the higher bits reserved for bpf_type_flag.
516 */
517 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
518 };
519 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
520
521 /* The information passed from prog-specific *_is_valid_access
522 * back to the verifier.
523 */
524 struct bpf_insn_access_aux {
525 enum bpf_reg_type reg_type;
526 union {
527 int ctx_field_size;
528 struct {
529 struct btf *btf;
530 u32 btf_id;
531 };
532 };
533 struct bpf_verifier_log *log; /* for verbose logs */
534 };
535
536 static inline void
bpf_ctx_record_field_size(struct bpf_insn_access_aux * aux,u32 size)537 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
538 {
539 aux->ctx_field_size = size;
540 }
541
bpf_pseudo_func(const struct bpf_insn * insn)542 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
543 {
544 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
545 insn->src_reg == BPF_PSEUDO_FUNC;
546 }
547
548 struct bpf_prog_ops {
549 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
550 union bpf_attr __user *uattr);
551 };
552
553 struct bpf_verifier_ops {
554 /* return eBPF function prototype for verification */
555 const struct bpf_func_proto *
556 (*get_func_proto)(enum bpf_func_id func_id,
557 const struct bpf_prog *prog);
558
559 /* return true if 'size' wide access at offset 'off' within bpf_context
560 * with 'type' (read or write) is allowed
561 */
562 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
563 const struct bpf_prog *prog,
564 struct bpf_insn_access_aux *info);
565 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
566 const struct bpf_prog *prog);
567 int (*gen_ld_abs)(const struct bpf_insn *orig,
568 struct bpf_insn *insn_buf);
569 u32 (*convert_ctx_access)(enum bpf_access_type type,
570 const struct bpf_insn *src,
571 struct bpf_insn *dst,
572 struct bpf_prog *prog, u32 *target_size);
573 int (*btf_struct_access)(struct bpf_verifier_log *log,
574 const struct btf *btf,
575 const struct btf_type *t, int off, int size,
576 enum bpf_access_type atype,
577 u32 *next_btf_id);
578 bool (*check_kfunc_call)(u32 kfunc_btf_id);
579 ANDROID_KABI_RESERVE(1);
580 };
581
582 struct bpf_prog_offload_ops {
583 /* verifier basic callbacks */
584 int (*insn_hook)(struct bpf_verifier_env *env,
585 int insn_idx, int prev_insn_idx);
586 int (*finalize)(struct bpf_verifier_env *env);
587 /* verifier optimization callbacks (called after .finalize) */
588 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
589 struct bpf_insn *insn);
590 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
591 /* program management callbacks */
592 int (*prepare)(struct bpf_prog *prog);
593 int (*translate)(struct bpf_prog *prog);
594 void (*destroy)(struct bpf_prog *prog);
595 ANDROID_KABI_RESERVE(1);
596 };
597
598 struct bpf_prog_offload {
599 struct bpf_prog *prog;
600 struct net_device *netdev;
601 struct bpf_offload_dev *offdev;
602 void *dev_priv;
603 struct list_head offloads;
604 bool dev_state;
605 bool opt_failed;
606 void *jited_image;
607 u32 jited_len;
608 ANDROID_KABI_RESERVE(1);
609 };
610
611 enum bpf_cgroup_storage_type {
612 BPF_CGROUP_STORAGE_SHARED,
613 BPF_CGROUP_STORAGE_PERCPU,
614 __BPF_CGROUP_STORAGE_MAX
615 };
616
617 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
618
619 /* The longest tracepoint has 12 args.
620 * See include/trace/bpf_probe.h
621 */
622 #define MAX_BPF_FUNC_ARGS 12
623
624 /* The maximum number of arguments passed through registers
625 * a single function may have.
626 */
627 #define MAX_BPF_FUNC_REG_ARGS 5
628
629 struct btf_func_model {
630 u8 ret_size;
631 u8 nr_args;
632 u8 arg_size[MAX_BPF_FUNC_ARGS];
633 };
634
635 /* Restore arguments before returning from trampoline to let original function
636 * continue executing. This flag is used for fentry progs when there are no
637 * fexit progs.
638 */
639 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
640 /* Call original function after fentry progs, but before fexit progs.
641 * Makes sense for fentry/fexit, normal calls and indirect calls.
642 */
643 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
644 /* Skip current frame and return to parent. Makes sense for fentry/fexit
645 * programs only. Should not be used with normal calls and indirect calls.
646 */
647 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
648 /* Store IP address of the caller on the trampoline stack,
649 * so it's available for trampoline's programs.
650 */
651 #define BPF_TRAMP_F_IP_ARG BIT(3)
652 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
653 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
654
655 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
656 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
657 */
658 #define BPF_MAX_TRAMP_PROGS 38
659
660 struct bpf_tramp_progs {
661 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
662 int nr_progs;
663 };
664
665 /* Different use cases for BPF trampoline:
666 * 1. replace nop at the function entry (kprobe equivalent)
667 * flags = BPF_TRAMP_F_RESTORE_REGS
668 * fentry = a set of programs to run before returning from trampoline
669 *
670 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
671 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
672 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
673 * fentry = a set of program to run before calling original function
674 * fexit = a set of program to run after original function
675 *
676 * 3. replace direct call instruction anywhere in the function body
677 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
678 * With flags = 0
679 * fentry = a set of programs to run before returning from trampoline
680 * With flags = BPF_TRAMP_F_CALL_ORIG
681 * orig_call = original callback addr or direct function addr
682 * fentry = a set of program to run before calling original function
683 * fexit = a set of program to run after original function
684 */
685 struct bpf_tramp_image;
686 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
687 const struct btf_func_model *m, u32 flags,
688 struct bpf_tramp_progs *tprogs,
689 void *orig_call);
690 /* these two functions are called from generated trampoline */
691 u64 notrace __bpf_prog_enter(struct bpf_prog *prog);
692 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
693 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog);
694 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start);
695 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
696 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
697
698 struct bpf_ksym {
699 unsigned long start;
700 unsigned long end;
701 char name[KSYM_NAME_LEN];
702 struct list_head lnode;
703 struct latch_tree_node tnode;
704 bool prog;
705 };
706
707 enum bpf_tramp_prog_type {
708 BPF_TRAMP_FENTRY,
709 BPF_TRAMP_FEXIT,
710 BPF_TRAMP_MODIFY_RETURN,
711 BPF_TRAMP_MAX,
712 BPF_TRAMP_REPLACE, /* more than MAX */
713 };
714
715 struct bpf_tramp_image {
716 void *image;
717 struct bpf_ksym ksym;
718 struct percpu_ref pcref;
719 void *ip_after_call;
720 void *ip_epilogue;
721 union {
722 struct rcu_head rcu;
723 struct work_struct work;
724 };
725 };
726
727 struct bpf_trampoline {
728 /* hlist for trampoline_table */
729 struct hlist_node hlist;
730 /* serializes access to fields of this trampoline */
731 struct mutex mutex;
732 refcount_t refcnt;
733 u64 key;
734 struct {
735 struct btf_func_model model;
736 void *addr;
737 bool ftrace_managed;
738 } func;
739 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
740 * program by replacing one of its functions. func.addr is the address
741 * of the function it replaced.
742 */
743 struct bpf_prog *extension_prog;
744 /* list of BPF programs using this trampoline */
745 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
746 /* Number of attached programs. A counter per kind. */
747 int progs_cnt[BPF_TRAMP_MAX];
748 /* Executable image of trampoline */
749 struct bpf_tramp_image *cur_image;
750 u64 selector;
751 struct module *mod;
752 };
753
754 struct bpf_attach_target_info {
755 struct btf_func_model fmodel;
756 long tgt_addr;
757 const char *tgt_name;
758 const struct btf_type *tgt_type;
759 };
760
761 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
762
763 struct bpf_dispatcher_prog {
764 struct bpf_prog *prog;
765 refcount_t users;
766 };
767
768 struct bpf_dispatcher {
769 /* dispatcher mutex */
770 struct mutex mutex;
771 void *func;
772 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
773 int num_progs;
774 void *image;
775 u32 image_off;
776 struct bpf_ksym ksym;
777 };
778
bpf_dispatcher_nop_func(const void * ctx,const struct bpf_insn * insnsi,unsigned int (* bpf_func)(const void *,const struct bpf_insn *))779 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
780 const void *ctx,
781 const struct bpf_insn *insnsi,
782 unsigned int (*bpf_func)(const void *,
783 const struct bpf_insn *))
784 {
785 return bpf_func(ctx, insnsi);
786 }
787 #ifdef CONFIG_BPF_JIT
788 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
789 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
790 struct bpf_trampoline *bpf_trampoline_get(u64 key,
791 struct bpf_attach_target_info *tgt_info);
792 void bpf_trampoline_put(struct bpf_trampoline *tr);
793 int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
794 #define BPF_DISPATCHER_INIT(_name) { \
795 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
796 .func = &_name##_func, \
797 .progs = {}, \
798 .num_progs = 0, \
799 .image = NULL, \
800 .image_off = 0, \
801 .ksym = { \
802 .name = #_name, \
803 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
804 }, \
805 }
806
807 #define DEFINE_BPF_DISPATCHER(name) \
808 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
809 const void *ctx, \
810 const struct bpf_insn *insnsi, \
811 unsigned int (*bpf_func)(const void *, \
812 const struct bpf_insn *)) \
813 { \
814 return bpf_func(ctx, insnsi); \
815 } \
816 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
817 struct bpf_dispatcher bpf_dispatcher_##name = \
818 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
819 #define DECLARE_BPF_DISPATCHER(name) \
820 unsigned int bpf_dispatcher_##name##_func( \
821 const void *ctx, \
822 const struct bpf_insn *insnsi, \
823 unsigned int (*bpf_func)(const void *, \
824 const struct bpf_insn *)); \
825 extern struct bpf_dispatcher bpf_dispatcher_##name;
826 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
827 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
828 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
829 struct bpf_prog *to);
830 /* Called only from JIT-enabled code, so there's no need for stubs. */
831 void *bpf_jit_alloc_exec_page(void);
832 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
833 void bpf_image_ksym_del(struct bpf_ksym *ksym);
834 void bpf_ksym_add(struct bpf_ksym *ksym);
835 void bpf_ksym_del(struct bpf_ksym *ksym);
836 int bpf_jit_charge_modmem(u32 pages);
837 void bpf_jit_uncharge_modmem(u32 pages);
838 #else
bpf_trampoline_link_prog(struct bpf_prog * prog,struct bpf_trampoline * tr)839 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
840 struct bpf_trampoline *tr)
841 {
842 return -ENOTSUPP;
843 }
bpf_trampoline_unlink_prog(struct bpf_prog * prog,struct bpf_trampoline * tr)844 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
845 struct bpf_trampoline *tr)
846 {
847 return -ENOTSUPP;
848 }
bpf_trampoline_get(u64 key,struct bpf_attach_target_info * tgt_info)849 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
850 struct bpf_attach_target_info *tgt_info)
851 {
852 return NULL;
853 }
bpf_trampoline_put(struct bpf_trampoline * tr)854 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
855 #define DEFINE_BPF_DISPATCHER(name)
856 #define DECLARE_BPF_DISPATCHER(name)
857 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
858 #define BPF_DISPATCHER_PTR(name) NULL
bpf_dispatcher_change_prog(struct bpf_dispatcher * d,struct bpf_prog * from,struct bpf_prog * to)859 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
860 struct bpf_prog *from,
861 struct bpf_prog *to) {}
is_bpf_image_address(unsigned long address)862 static inline bool is_bpf_image_address(unsigned long address)
863 {
864 return false;
865 }
866 #endif
867
868 struct bpf_func_info_aux {
869 u16 linkage;
870 bool unreliable;
871 };
872
873 enum bpf_jit_poke_reason {
874 BPF_POKE_REASON_TAIL_CALL,
875 };
876
877 /* Descriptor of pokes pointing /into/ the JITed image. */
878 struct bpf_jit_poke_descriptor {
879 void *tailcall_target;
880 void *tailcall_bypass;
881 void *bypass_addr;
882 void *aux;
883 union {
884 struct {
885 struct bpf_map *map;
886 u32 key;
887 } tail_call;
888 };
889 bool tailcall_target_stable;
890 u8 adj_off;
891 u16 reason;
892 u32 insn_idx;
893 };
894
895 /* reg_type info for ctx arguments */
896 struct bpf_ctx_arg_aux {
897 u32 offset;
898 enum bpf_reg_type reg_type;
899 u32 btf_id;
900 };
901
902 struct btf_mod_pair {
903 struct btf *btf;
904 struct module *module;
905 };
906
907 struct bpf_kfunc_desc_tab;
908
909 struct bpf_prog_aux {
910 atomic64_t refcnt;
911 u32 used_map_cnt;
912 u32 used_btf_cnt;
913 u32 max_ctx_offset;
914 u32 max_pkt_offset;
915 u32 max_tp_access;
916 u32 stack_depth;
917 u32 id;
918 u32 func_cnt; /* used by non-func prog as the number of func progs */
919 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
920 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
921 u32 ctx_arg_info_size;
922 u32 max_rdonly_access;
923 u32 max_rdwr_access;
924 struct btf *attach_btf;
925 const struct bpf_ctx_arg_aux *ctx_arg_info;
926 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
927 struct bpf_prog *dst_prog;
928 struct bpf_trampoline *dst_trampoline;
929 enum bpf_prog_type saved_dst_prog_type;
930 enum bpf_attach_type saved_dst_attach_type;
931 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
932 bool offload_requested;
933 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
934 bool func_proto_unreliable;
935 bool sleepable;
936 bool tail_call_reachable;
937 struct hlist_node tramp_hlist;
938 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
939 const struct btf_type *attach_func_proto;
940 /* function name for valid attach_btf_id */
941 const char *attach_func_name;
942 struct bpf_prog **func;
943 void *jit_data; /* JIT specific data. arch dependent */
944 struct bpf_jit_poke_descriptor *poke_tab;
945 struct bpf_kfunc_desc_tab *kfunc_tab;
946 u32 size_poke_tab;
947 struct bpf_ksym ksym;
948 const struct bpf_prog_ops *ops;
949 struct bpf_map **used_maps;
950 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
951 struct btf_mod_pair *used_btfs;
952 struct bpf_prog *prog;
953 struct user_struct *user;
954 u64 load_time; /* ns since boottime */
955 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
956 char name[BPF_OBJ_NAME_LEN];
957 #ifdef CONFIG_SECURITY
958 void *security;
959 #endif
960 struct bpf_prog_offload *offload;
961 struct btf *btf;
962 struct bpf_func_info *func_info;
963 struct bpf_func_info_aux *func_info_aux;
964 /* bpf_line_info loaded from userspace. linfo->insn_off
965 * has the xlated insn offset.
966 * Both the main and sub prog share the same linfo.
967 * The subprog can access its first linfo by
968 * using the linfo_idx.
969 */
970 struct bpf_line_info *linfo;
971 /* jited_linfo is the jited addr of the linfo. It has a
972 * one to one mapping to linfo:
973 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
974 * Both the main and sub prog share the same jited_linfo.
975 * The subprog can access its first jited_linfo by
976 * using the linfo_idx.
977 */
978 void **jited_linfo;
979 u32 func_info_cnt;
980 u32 nr_linfo;
981 /* subprog can use linfo_idx to access its first linfo and
982 * jited_linfo.
983 * main prog always has linfo_idx == 0
984 */
985 u32 linfo_idx;
986 u32 num_exentries;
987 struct exception_table_entry *extable;
988 union {
989 struct work_struct work;
990 struct rcu_head rcu;
991 };
992 ANDROID_KABI_RESERVE(1);
993 };
994
995 struct bpf_array_aux {
996 /* 'Ownership' of prog array is claimed by the first program that
997 * is going to use this map or by the first program which FD is
998 * stored in the map to make sure that all callers and callees have
999 * the same prog type and JITed flag.
1000 */
1001 struct {
1002 spinlock_t lock;
1003 enum bpf_prog_type type;
1004 bool jited;
1005 } owner;
1006 /* Programs with direct jumps into programs part of this array. */
1007 struct list_head poke_progs;
1008 struct bpf_map *map;
1009 struct mutex poke_mutex;
1010 struct work_struct work;
1011 };
1012
1013 struct bpf_link {
1014 atomic64_t refcnt;
1015 u32 id;
1016 enum bpf_link_type type;
1017 const struct bpf_link_ops *ops;
1018 struct bpf_prog *prog;
1019 struct work_struct work;
1020 };
1021
1022 struct bpf_link_ops {
1023 void (*release)(struct bpf_link *link);
1024 void (*dealloc)(struct bpf_link *link);
1025 int (*detach)(struct bpf_link *link);
1026 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1027 struct bpf_prog *old_prog);
1028 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1029 int (*fill_link_info)(const struct bpf_link *link,
1030 struct bpf_link_info *info);
1031 ANDROID_KABI_RESERVE(1);
1032 };
1033
1034 struct bpf_link_primer {
1035 struct bpf_link *link;
1036 struct file *file;
1037 int fd;
1038 u32 id;
1039 };
1040
1041 struct bpf_struct_ops_value;
1042 struct btf_member;
1043
1044 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1045 struct bpf_struct_ops {
1046 const struct bpf_verifier_ops *verifier_ops;
1047 int (*init)(struct btf *btf);
1048 int (*check_member)(const struct btf_type *t,
1049 const struct btf_member *member);
1050 int (*init_member)(const struct btf_type *t,
1051 const struct btf_member *member,
1052 void *kdata, const void *udata);
1053 int (*reg)(void *kdata);
1054 void (*unreg)(void *kdata);
1055 const struct btf_type *type;
1056 const struct btf_type *value_type;
1057 const char *name;
1058 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1059 u32 type_id;
1060 u32 value_id;
1061 ANDROID_KABI_RESERVE(1);
1062 };
1063
1064 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1065 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1066 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1067 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1068 bool bpf_struct_ops_get(const void *kdata);
1069 void bpf_struct_ops_put(const void *kdata);
1070 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1071 void *value);
bpf_try_module_get(const void * data,struct module * owner)1072 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1073 {
1074 if (owner == BPF_MODULE_OWNER)
1075 return bpf_struct_ops_get(data);
1076 else
1077 return try_module_get(owner);
1078 }
bpf_module_put(const void * data,struct module * owner)1079 static inline void bpf_module_put(const void *data, struct module *owner)
1080 {
1081 if (owner == BPF_MODULE_OWNER)
1082 bpf_struct_ops_put(data);
1083 else
1084 module_put(owner);
1085 }
1086 #else
bpf_struct_ops_find(u32 type_id)1087 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1088 {
1089 return NULL;
1090 }
bpf_struct_ops_init(struct btf * btf,struct bpf_verifier_log * log)1091 static inline void bpf_struct_ops_init(struct btf *btf,
1092 struct bpf_verifier_log *log)
1093 {
1094 }
bpf_try_module_get(const void * data,struct module * owner)1095 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1096 {
1097 return try_module_get(owner);
1098 }
bpf_module_put(const void * data,struct module * owner)1099 static inline void bpf_module_put(const void *data, struct module *owner)
1100 {
1101 module_put(owner);
1102 }
bpf_struct_ops_map_sys_lookup_elem(struct bpf_map * map,void * key,void * value)1103 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1104 void *key,
1105 void *value)
1106 {
1107 return -EINVAL;
1108 }
1109 #endif
1110
1111 struct bpf_array {
1112 struct bpf_map map;
1113 u32 elem_size;
1114 u32 index_mask;
1115 struct bpf_array_aux *aux;
1116 union {
1117 char value[0] __aligned(8);
1118 void *ptrs[0] __aligned(8);
1119 void __percpu *pptrs[0] __aligned(8);
1120 };
1121 };
1122
1123 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1124 #define MAX_TAIL_CALL_CNT 32
1125
1126 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1127 BPF_F_RDONLY_PROG | \
1128 BPF_F_WRONLY | \
1129 BPF_F_WRONLY_PROG)
1130
1131 #define BPF_MAP_CAN_READ BIT(0)
1132 #define BPF_MAP_CAN_WRITE BIT(1)
1133
bpf_map_flags_to_cap(struct bpf_map * map)1134 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1135 {
1136 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1137
1138 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1139 * not possible.
1140 */
1141 if (access_flags & BPF_F_RDONLY_PROG)
1142 return BPF_MAP_CAN_READ;
1143 else if (access_flags & BPF_F_WRONLY_PROG)
1144 return BPF_MAP_CAN_WRITE;
1145 else
1146 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1147 }
1148
bpf_map_flags_access_ok(u32 access_flags)1149 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1150 {
1151 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1152 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1153 }
1154
1155 struct bpf_event_entry {
1156 struct perf_event *event;
1157 struct file *perf_file;
1158 struct file *map_file;
1159 struct rcu_head rcu;
1160 };
1161
1162 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
1163 int bpf_prog_calc_tag(struct bpf_prog *fp);
1164
1165 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1166
1167 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1168 unsigned long off, unsigned long len);
1169 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1170 const struct bpf_insn *src,
1171 struct bpf_insn *dst,
1172 struct bpf_prog *prog,
1173 u32 *target_size);
1174
1175 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1176 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1177
1178 /* an array of programs to be executed under rcu_lock.
1179 *
1180 * Typical usage:
1181 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run);
1182 *
1183 * the structure returned by bpf_prog_array_alloc() should be populated
1184 * with program pointers and the last pointer must be NULL.
1185 * The user has to keep refcnt on the program and make sure the program
1186 * is removed from the array before bpf_prog_put().
1187 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1188 * since other cpus are walking the array of pointers in parallel.
1189 */
1190 struct bpf_prog_array_item {
1191 struct bpf_prog *prog;
1192 union {
1193 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1194 u64 bpf_cookie;
1195 };
1196 };
1197
1198 struct bpf_prog_array {
1199 struct rcu_head rcu;
1200 struct bpf_prog_array_item items[];
1201 };
1202
1203 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1204 void bpf_prog_array_free(struct bpf_prog_array *progs);
1205 int bpf_prog_array_length(struct bpf_prog_array *progs);
1206 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1207 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1208 __u32 __user *prog_ids, u32 cnt);
1209
1210 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1211 struct bpf_prog *old_prog);
1212 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1213 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1214 struct bpf_prog *prog);
1215 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1216 u32 *prog_ids, u32 request_cnt,
1217 u32 *prog_cnt);
1218 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1219 struct bpf_prog *exclude_prog,
1220 struct bpf_prog *include_prog,
1221 u64 bpf_cookie,
1222 struct bpf_prog_array **new_array);
1223
1224 struct bpf_run_ctx {};
1225
1226 struct bpf_cg_run_ctx {
1227 struct bpf_run_ctx run_ctx;
1228 const struct bpf_prog_array_item *prog_item;
1229 };
1230
1231 struct bpf_trace_run_ctx {
1232 struct bpf_run_ctx run_ctx;
1233 u64 bpf_cookie;
1234 };
1235
bpf_set_run_ctx(struct bpf_run_ctx * new_ctx)1236 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1237 {
1238 struct bpf_run_ctx *old_ctx = NULL;
1239
1240 #ifdef CONFIG_BPF_SYSCALL
1241 old_ctx = current->bpf_ctx;
1242 current->bpf_ctx = new_ctx;
1243 #endif
1244 return old_ctx;
1245 }
1246
bpf_reset_run_ctx(struct bpf_run_ctx * old_ctx)1247 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1248 {
1249 #ifdef CONFIG_BPF_SYSCALL
1250 current->bpf_ctx = old_ctx;
1251 #endif
1252 }
1253
1254 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1255 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1256 /* BPF program asks to set CN on the packet. */
1257 #define BPF_RET_SET_CN (1 << 0)
1258
1259 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1260
1261 static __always_inline u32
BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu * array_rcu,const void * ctx,bpf_prog_run_fn run_prog,u32 * ret_flags)1262 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu,
1263 const void *ctx, bpf_prog_run_fn run_prog,
1264 u32 *ret_flags)
1265 {
1266 const struct bpf_prog_array_item *item;
1267 const struct bpf_prog *prog;
1268 const struct bpf_prog_array *array;
1269 struct bpf_run_ctx *old_run_ctx;
1270 struct bpf_cg_run_ctx run_ctx;
1271 u32 ret = 1;
1272 u32 func_ret;
1273
1274 migrate_disable();
1275 rcu_read_lock();
1276 array = rcu_dereference(array_rcu);
1277 item = &array->items[0];
1278 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1279 while ((prog = READ_ONCE(item->prog))) {
1280 run_ctx.prog_item = item;
1281 func_ret = run_prog(prog, ctx);
1282 ret &= (func_ret & 1);
1283 *(ret_flags) |= (func_ret >> 1);
1284 item++;
1285 }
1286 bpf_reset_run_ctx(old_run_ctx);
1287 rcu_read_unlock();
1288 migrate_enable();
1289 return ret;
1290 }
1291
1292 static __always_inline u32
BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu * array_rcu,const void * ctx,bpf_prog_run_fn run_prog)1293 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu,
1294 const void *ctx, bpf_prog_run_fn run_prog)
1295 {
1296 const struct bpf_prog_array_item *item;
1297 const struct bpf_prog *prog;
1298 const struct bpf_prog_array *array;
1299 struct bpf_run_ctx *old_run_ctx;
1300 struct bpf_cg_run_ctx run_ctx;
1301 u32 ret = 1;
1302
1303 migrate_disable();
1304 rcu_read_lock();
1305 array = rcu_dereference(array_rcu);
1306 item = &array->items[0];
1307 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1308 while ((prog = READ_ONCE(item->prog))) {
1309 run_ctx.prog_item = item;
1310 ret &= run_prog(prog, ctx);
1311 item++;
1312 }
1313 bpf_reset_run_ctx(old_run_ctx);
1314 rcu_read_unlock();
1315 migrate_enable();
1316 return ret;
1317 }
1318
1319 static __always_inline u32
BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu * array_rcu,const void * ctx,bpf_prog_run_fn run_prog)1320 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu,
1321 const void *ctx, bpf_prog_run_fn run_prog)
1322 {
1323 const struct bpf_prog_array_item *item;
1324 const struct bpf_prog *prog;
1325 const struct bpf_prog_array *array;
1326 struct bpf_run_ctx *old_run_ctx;
1327 struct bpf_trace_run_ctx run_ctx;
1328 u32 ret = 1;
1329
1330 migrate_disable();
1331 rcu_read_lock();
1332 array = rcu_dereference(array_rcu);
1333 if (unlikely(!array))
1334 goto out;
1335 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1336 item = &array->items[0];
1337 while ((prog = READ_ONCE(item->prog))) {
1338 run_ctx.bpf_cookie = item->bpf_cookie;
1339 ret &= run_prog(prog, ctx);
1340 item++;
1341 }
1342 bpf_reset_run_ctx(old_run_ctx);
1343 out:
1344 rcu_read_unlock();
1345 migrate_enable();
1346 return ret;
1347 }
1348
1349 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1350 * so BPF programs can request cwr for TCP packets.
1351 *
1352 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1353 * packet. This macro changes the behavior so the low order bit
1354 * indicates whether the packet should be dropped (0) or not (1)
1355 * and the next bit is a congestion notification bit. This could be
1356 * used by TCP to call tcp_enter_cwr()
1357 *
1358 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1359 * 0: drop packet
1360 * 1: keep packet
1361 * 2: drop packet and cn
1362 * 3: keep packet and cn
1363 *
1364 * This macro then converts it to one of the NET_XMIT or an error
1365 * code that is then interpreted as drop packet (and no cn):
1366 * 0: NET_XMIT_SUCCESS skb should be transmitted
1367 * 1: NET_XMIT_DROP skb should be dropped and cn
1368 * 2: NET_XMIT_CN skb should be transmitted and cn
1369 * 3: -EPERM skb should be dropped
1370 */
1371 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1372 ({ \
1373 u32 _flags = 0; \
1374 bool _cn; \
1375 u32 _ret; \
1376 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, &_flags); \
1377 _cn = _flags & BPF_RET_SET_CN; \
1378 if (_ret) \
1379 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1380 else \
1381 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1382 _ret; \
1383 })
1384
1385 #ifdef CONFIG_BPF_SYSCALL
1386 DECLARE_PER_CPU(int, bpf_prog_active);
1387 extern struct mutex bpf_stats_enabled_mutex;
1388
1389 /*
1390 * Block execution of BPF programs attached to instrumentation (perf,
1391 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1392 * these events can happen inside a region which holds a map bucket lock
1393 * and can deadlock on it.
1394 */
bpf_disable_instrumentation(void)1395 static inline void bpf_disable_instrumentation(void)
1396 {
1397 migrate_disable();
1398 this_cpu_inc(bpf_prog_active);
1399 }
1400
bpf_enable_instrumentation(void)1401 static inline void bpf_enable_instrumentation(void)
1402 {
1403 this_cpu_dec(bpf_prog_active);
1404 migrate_enable();
1405 }
1406
1407 extern const struct file_operations bpf_map_fops;
1408 extern const struct file_operations bpf_prog_fops;
1409 extern const struct file_operations bpf_iter_fops;
1410
1411 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1412 extern const struct bpf_prog_ops _name ## _prog_ops; \
1413 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1414 #define BPF_MAP_TYPE(_id, _ops) \
1415 extern const struct bpf_map_ops _ops;
1416 #define BPF_LINK_TYPE(_id, _name)
1417 #include <linux/bpf_types.h>
1418 #undef BPF_PROG_TYPE
1419 #undef BPF_MAP_TYPE
1420 #undef BPF_LINK_TYPE
1421
1422 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1423 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1424 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1425
1426 struct bpf_prog *bpf_prog_get(u32 ufd);
1427 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1428 bool attach_drv);
1429 void bpf_prog_add(struct bpf_prog *prog, int i);
1430 void bpf_prog_sub(struct bpf_prog *prog, int i);
1431 void bpf_prog_inc(struct bpf_prog *prog);
1432 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1433 void bpf_prog_put(struct bpf_prog *prog);
1434
1435 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1436 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1437
1438 struct bpf_map *bpf_map_get(u32 ufd);
1439 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1440 struct bpf_map *__bpf_map_get(struct fd f);
1441 void bpf_map_inc(struct bpf_map *map);
1442 void bpf_map_inc_with_uref(struct bpf_map *map);
1443 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1444 void bpf_map_put_with_uref(struct bpf_map *map);
1445 void bpf_map_put(struct bpf_map *map);
1446 void *bpf_map_area_alloc(u64 size, int numa_node);
1447 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1448 void bpf_map_area_free(void *base);
1449 bool bpf_map_write_active(const struct bpf_map *map);
1450 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1451 int generic_map_lookup_batch(struct bpf_map *map,
1452 const union bpf_attr *attr,
1453 union bpf_attr __user *uattr);
1454 int generic_map_update_batch(struct bpf_map *map,
1455 const union bpf_attr *attr,
1456 union bpf_attr __user *uattr);
1457 int generic_map_delete_batch(struct bpf_map *map,
1458 const union bpf_attr *attr,
1459 union bpf_attr __user *uattr);
1460 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1461 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1462
1463 #ifdef CONFIG_MEMCG_KMEM
1464 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1465 int node);
1466 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1467 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1468 size_t align, gfp_t flags);
1469 #else
1470 static inline void *
bpf_map_kmalloc_node(const struct bpf_map * map,size_t size,gfp_t flags,int node)1471 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1472 int node)
1473 {
1474 return kmalloc_node(size, flags, node);
1475 }
1476
1477 static inline void *
bpf_map_kzalloc(const struct bpf_map * map,size_t size,gfp_t flags)1478 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1479 {
1480 return kzalloc(size, flags);
1481 }
1482
1483 static inline void __percpu *
bpf_map_alloc_percpu(const struct bpf_map * map,size_t size,size_t align,gfp_t flags)1484 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
1485 gfp_t flags)
1486 {
1487 return __alloc_percpu_gfp(size, align, flags);
1488 }
1489 #endif
1490
1491 extern int sysctl_unprivileged_bpf_disabled;
1492
bpf_allow_ptr_leaks(void)1493 static inline bool bpf_allow_ptr_leaks(void)
1494 {
1495 return perfmon_capable();
1496 }
1497
bpf_allow_uninit_stack(void)1498 static inline bool bpf_allow_uninit_stack(void)
1499 {
1500 return perfmon_capable();
1501 }
1502
bpf_allow_ptr_to_map_access(void)1503 static inline bool bpf_allow_ptr_to_map_access(void)
1504 {
1505 return perfmon_capable();
1506 }
1507
bpf_bypass_spec_v1(void)1508 static inline bool bpf_bypass_spec_v1(void)
1509 {
1510 return perfmon_capable();
1511 }
1512
bpf_bypass_spec_v4(void)1513 static inline bool bpf_bypass_spec_v4(void)
1514 {
1515 return perfmon_capable();
1516 }
1517
1518 int bpf_map_new_fd(struct bpf_map *map, int flags);
1519 int bpf_prog_new_fd(struct bpf_prog *prog);
1520
1521 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1522 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1523 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1524 int bpf_link_settle(struct bpf_link_primer *primer);
1525 void bpf_link_cleanup(struct bpf_link_primer *primer);
1526 void bpf_link_inc(struct bpf_link *link);
1527 void bpf_link_put(struct bpf_link *link);
1528 int bpf_link_new_fd(struct bpf_link *link);
1529 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1530 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1531
1532 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1533 int bpf_obj_get_user(const char __user *pathname, int flags);
1534
1535 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1536 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1537 extern int bpf_iter_ ## target(args); \
1538 int __init bpf_iter_ ## target(args) { return 0; }
1539
1540 struct bpf_iter_aux_info {
1541 struct bpf_map *map;
1542 };
1543
1544 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1545 union bpf_iter_link_info *linfo,
1546 struct bpf_iter_aux_info *aux);
1547 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1548 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1549 struct seq_file *seq);
1550 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1551 struct bpf_link_info *info);
1552 typedef const struct bpf_func_proto *
1553 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
1554 const struct bpf_prog *prog);
1555
1556 enum bpf_iter_feature {
1557 BPF_ITER_RESCHED = BIT(0),
1558 };
1559
1560 #define BPF_ITER_CTX_ARG_MAX 2
1561 struct bpf_iter_reg {
1562 const char *target;
1563 bpf_iter_attach_target_t attach_target;
1564 bpf_iter_detach_target_t detach_target;
1565 bpf_iter_show_fdinfo_t show_fdinfo;
1566 bpf_iter_fill_link_info_t fill_link_info;
1567 bpf_iter_get_func_proto_t get_func_proto;
1568 u32 ctx_arg_info_size;
1569 u32 feature;
1570 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1571 const struct bpf_iter_seq_info *seq_info;
1572 };
1573
1574 struct bpf_iter_meta {
1575 __bpf_md_ptr(struct seq_file *, seq);
1576 u64 session_id;
1577 u64 seq_num;
1578 };
1579
1580 struct bpf_iter__bpf_map_elem {
1581 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1582 __bpf_md_ptr(struct bpf_map *, map);
1583 __bpf_md_ptr(void *, key);
1584 __bpf_md_ptr(void *, value);
1585 };
1586
1587 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1588 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1589 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1590 const struct bpf_func_proto *
1591 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
1592 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
1593 int bpf_iter_new_fd(struct bpf_link *link);
1594 bool bpf_link_is_iter(struct bpf_link *link);
1595 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1596 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1597 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1598 struct seq_file *seq);
1599 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1600 struct bpf_link_info *info);
1601
1602 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
1603 struct bpf_func_state *caller,
1604 struct bpf_func_state *callee);
1605
1606 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1607 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1608 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1609 u64 flags);
1610 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1611 u64 flags);
1612
1613 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1614
1615 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1616 void *key, void *value, u64 map_flags);
1617 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1618 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1619 void *key, void *value, u64 map_flags);
1620 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1621
1622 int bpf_get_file_flag(int flags);
1623 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
1624 size_t actual_size);
1625
1626 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1627 * forced to use 'long' read/writes to try to atomically copy long counters.
1628 * Best-effort only. No barriers here, since it _will_ race with concurrent
1629 * updates from BPF programs. Called from bpf syscall and mostly used with
1630 * size 8 or 16 bytes, so ask compiler to inline it.
1631 */
bpf_long_memcpy(void * dst,const void * src,u32 size)1632 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1633 {
1634 const long *lsrc = src;
1635 long *ldst = dst;
1636
1637 size /= sizeof(long);
1638 while (size--)
1639 *ldst++ = *lsrc++;
1640 }
1641
1642 /* verify correctness of eBPF program */
1643 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
1644
1645 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1646 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1647 #endif
1648
1649 struct btf *bpf_get_btf_vmlinux(void);
1650
1651 /* Map specifics */
1652 struct xdp_buff;
1653 struct sk_buff;
1654 struct bpf_dtab_netdev;
1655 struct bpf_cpu_map_entry;
1656
1657 void __dev_flush(void);
1658 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1659 struct net_device *dev_rx);
1660 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1661 struct net_device *dev_rx);
1662 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1663 struct bpf_map *map, bool exclude_ingress);
1664 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1665 struct bpf_prog *xdp_prog);
1666 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1667 struct bpf_prog *xdp_prog, struct bpf_map *map,
1668 bool exclude_ingress);
1669
1670 void __cpu_map_flush(void);
1671 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1672 struct net_device *dev_rx);
1673 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1674 struct sk_buff *skb);
1675
1676 /* Return map's numa specified by userspace */
bpf_map_attr_numa_node(const union bpf_attr * attr)1677 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1678 {
1679 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1680 attr->numa_node : NUMA_NO_NODE;
1681 }
1682
1683 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1684 int array_map_alloc_check(union bpf_attr *attr);
1685
1686 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1687 union bpf_attr __user *uattr);
1688 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1689 union bpf_attr __user *uattr);
1690 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1691 const union bpf_attr *kattr,
1692 union bpf_attr __user *uattr);
1693 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1694 const union bpf_attr *kattr,
1695 union bpf_attr __user *uattr);
1696 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1697 const union bpf_attr *kattr,
1698 union bpf_attr __user *uattr);
1699 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1700 const union bpf_attr *kattr,
1701 union bpf_attr __user *uattr);
1702 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id);
1703 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1704 const struct bpf_prog *prog,
1705 struct bpf_insn_access_aux *info);
1706 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf,
1707 const struct btf_type *t, int off, int size,
1708 enum bpf_access_type atype,
1709 u32 *next_btf_id);
1710 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1711 const struct btf *btf, u32 id, int off,
1712 const struct btf *need_btf, u32 need_type_id);
1713
1714 int btf_distill_func_proto(struct bpf_verifier_log *log,
1715 struct btf *btf,
1716 const struct btf_type *func_proto,
1717 const char *func_name,
1718 struct btf_func_model *m);
1719
1720 struct bpf_reg_state;
1721 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
1722 struct bpf_reg_state *regs);
1723 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
1724 const struct btf *btf, u32 func_id,
1725 struct bpf_reg_state *regs);
1726 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1727 struct bpf_reg_state *reg);
1728 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1729 struct btf *btf, const struct btf_type *t);
1730
1731 struct bpf_prog *bpf_prog_by_id(u32 id);
1732 struct bpf_link *bpf_link_by_id(u32 id);
1733
1734 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1735 void bpf_task_storage_free(struct task_struct *task);
1736 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
1737 const struct btf_func_model *
1738 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1739 const struct bpf_insn *insn);
1740
unprivileged_ebpf_enabled(void)1741 static inline bool unprivileged_ebpf_enabled(void)
1742 {
1743 return !sysctl_unprivileged_bpf_disabled;
1744 }
1745
1746 #else /* !CONFIG_BPF_SYSCALL */
bpf_prog_get(u32 ufd)1747 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1748 {
1749 return ERR_PTR(-EOPNOTSUPP);
1750 }
1751
bpf_prog_get_type_dev(u32 ufd,enum bpf_prog_type type,bool attach_drv)1752 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1753 enum bpf_prog_type type,
1754 bool attach_drv)
1755 {
1756 return ERR_PTR(-EOPNOTSUPP);
1757 }
1758
bpf_prog_add(struct bpf_prog * prog,int i)1759 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1760 {
1761 }
1762
bpf_prog_sub(struct bpf_prog * prog,int i)1763 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1764 {
1765 }
1766
bpf_prog_put(struct bpf_prog * prog)1767 static inline void bpf_prog_put(struct bpf_prog *prog)
1768 {
1769 }
1770
bpf_prog_inc(struct bpf_prog * prog)1771 static inline void bpf_prog_inc(struct bpf_prog *prog)
1772 {
1773 }
1774
1775 static inline struct bpf_prog *__must_check
bpf_prog_inc_not_zero(struct bpf_prog * prog)1776 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1777 {
1778 return ERR_PTR(-EOPNOTSUPP);
1779 }
1780
bpf_link_init(struct bpf_link * link,enum bpf_link_type type,const struct bpf_link_ops * ops,struct bpf_prog * prog)1781 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1782 const struct bpf_link_ops *ops,
1783 struct bpf_prog *prog)
1784 {
1785 }
1786
bpf_link_prime(struct bpf_link * link,struct bpf_link_primer * primer)1787 static inline int bpf_link_prime(struct bpf_link *link,
1788 struct bpf_link_primer *primer)
1789 {
1790 return -EOPNOTSUPP;
1791 }
1792
bpf_link_settle(struct bpf_link_primer * primer)1793 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1794 {
1795 return -EOPNOTSUPP;
1796 }
1797
bpf_link_cleanup(struct bpf_link_primer * primer)1798 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1799 {
1800 }
1801
bpf_link_inc(struct bpf_link * link)1802 static inline void bpf_link_inc(struct bpf_link *link)
1803 {
1804 }
1805
bpf_link_put(struct bpf_link * link)1806 static inline void bpf_link_put(struct bpf_link *link)
1807 {
1808 }
1809
bpf_obj_get_user(const char __user * pathname,int flags)1810 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1811 {
1812 return -EOPNOTSUPP;
1813 }
1814
dev_map_can_have_prog(struct bpf_map * map)1815 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1816 {
1817 return false;
1818 }
1819
__dev_flush(void)1820 static inline void __dev_flush(void)
1821 {
1822 }
1823
1824 struct xdp_buff;
1825 struct bpf_dtab_netdev;
1826 struct bpf_cpu_map_entry;
1827
1828 static inline
dev_xdp_enqueue(struct net_device * dev,struct xdp_buff * xdp,struct net_device * dev_rx)1829 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1830 struct net_device *dev_rx)
1831 {
1832 return 0;
1833 }
1834
1835 static inline
dev_map_enqueue(struct bpf_dtab_netdev * dst,struct xdp_buff * xdp,struct net_device * dev_rx)1836 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1837 struct net_device *dev_rx)
1838 {
1839 return 0;
1840 }
1841
1842 static inline
dev_map_enqueue_multi(struct xdp_buff * xdp,struct net_device * dev_rx,struct bpf_map * map,bool exclude_ingress)1843 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1844 struct bpf_map *map, bool exclude_ingress)
1845 {
1846 return 0;
1847 }
1848
1849 struct sk_buff;
1850
dev_map_generic_redirect(struct bpf_dtab_netdev * dst,struct sk_buff * skb,struct bpf_prog * xdp_prog)1851 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1852 struct sk_buff *skb,
1853 struct bpf_prog *xdp_prog)
1854 {
1855 return 0;
1856 }
1857
1858 static inline
dev_map_redirect_multi(struct net_device * dev,struct sk_buff * skb,struct bpf_prog * xdp_prog,struct bpf_map * map,bool exclude_ingress)1859 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1860 struct bpf_prog *xdp_prog, struct bpf_map *map,
1861 bool exclude_ingress)
1862 {
1863 return 0;
1864 }
1865
__cpu_map_flush(void)1866 static inline void __cpu_map_flush(void)
1867 {
1868 }
1869
cpu_map_enqueue(struct bpf_cpu_map_entry * rcpu,struct xdp_buff * xdp,struct net_device * dev_rx)1870 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1871 struct xdp_buff *xdp,
1872 struct net_device *dev_rx)
1873 {
1874 return 0;
1875 }
1876
cpu_map_generic_redirect(struct bpf_cpu_map_entry * rcpu,struct sk_buff * skb)1877 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1878 struct sk_buff *skb)
1879 {
1880 return -EOPNOTSUPP;
1881 }
1882
cpu_map_prog_allowed(struct bpf_map * map)1883 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1884 {
1885 return false;
1886 }
1887
bpf_prog_get_type_path(const char * name,enum bpf_prog_type type)1888 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1889 enum bpf_prog_type type)
1890 {
1891 return ERR_PTR(-EOPNOTSUPP);
1892 }
1893
bpf_prog_test_run_xdp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1894 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1895 const union bpf_attr *kattr,
1896 union bpf_attr __user *uattr)
1897 {
1898 return -ENOTSUPP;
1899 }
1900
bpf_prog_test_run_skb(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1901 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1902 const union bpf_attr *kattr,
1903 union bpf_attr __user *uattr)
1904 {
1905 return -ENOTSUPP;
1906 }
1907
bpf_prog_test_run_tracing(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1908 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1909 const union bpf_attr *kattr,
1910 union bpf_attr __user *uattr)
1911 {
1912 return -ENOTSUPP;
1913 }
1914
bpf_prog_test_run_flow_dissector(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1915 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1916 const union bpf_attr *kattr,
1917 union bpf_attr __user *uattr)
1918 {
1919 return -ENOTSUPP;
1920 }
1921
bpf_prog_test_run_sk_lookup(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1922 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1923 const union bpf_attr *kattr,
1924 union bpf_attr __user *uattr)
1925 {
1926 return -ENOTSUPP;
1927 }
1928
bpf_prog_test_check_kfunc_call(u32 kfunc_id)1929 static inline bool bpf_prog_test_check_kfunc_call(u32 kfunc_id)
1930 {
1931 return false;
1932 }
1933
bpf_map_put(struct bpf_map * map)1934 static inline void bpf_map_put(struct bpf_map *map)
1935 {
1936 }
1937
bpf_prog_by_id(u32 id)1938 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1939 {
1940 return ERR_PTR(-ENOTSUPP);
1941 }
1942
1943 static inline const struct bpf_func_proto *
bpf_base_func_proto(enum bpf_func_id func_id)1944 bpf_base_func_proto(enum bpf_func_id func_id)
1945 {
1946 return NULL;
1947 }
1948
bpf_task_storage_free(struct task_struct * task)1949 static inline void bpf_task_storage_free(struct task_struct *task)
1950 {
1951 }
1952
bpf_prog_has_kfunc_call(const struct bpf_prog * prog)1953 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
1954 {
1955 return false;
1956 }
1957
1958 static inline const struct btf_func_model *
bpf_jit_find_kfunc_model(const struct bpf_prog * prog,const struct bpf_insn * insn)1959 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1960 const struct bpf_insn *insn)
1961 {
1962 return NULL;
1963 }
1964
unprivileged_ebpf_enabled(void)1965 static inline bool unprivileged_ebpf_enabled(void)
1966 {
1967 return false;
1968 }
1969
1970 #endif /* CONFIG_BPF_SYSCALL */
1971
1972 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
1973 struct btf_mod_pair *used_btfs, u32 len);
1974
bpf_prog_get_type(u32 ufd,enum bpf_prog_type type)1975 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1976 enum bpf_prog_type type)
1977 {
1978 return bpf_prog_get_type_dev(ufd, type, false);
1979 }
1980
1981 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1982 struct bpf_map **used_maps, u32 len);
1983
1984 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1985
1986 int bpf_prog_offload_compile(struct bpf_prog *prog);
1987 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1988 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1989 struct bpf_prog *prog);
1990
1991 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1992
1993 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1994 int bpf_map_offload_update_elem(struct bpf_map *map,
1995 void *key, void *value, u64 flags);
1996 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1997 int bpf_map_offload_get_next_key(struct bpf_map *map,
1998 void *key, void *next_key);
1999
2000 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2001
2002 struct bpf_offload_dev *
2003 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2004 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2005 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2006 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2007 struct net_device *netdev);
2008 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2009 struct net_device *netdev);
2010 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2011
2012 void unpriv_ebpf_notify(int new_state);
2013
2014 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2015 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
2016
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2017 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2018 {
2019 return aux->offload_requested;
2020 }
2021
bpf_map_is_dev_bound(struct bpf_map * map)2022 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2023 {
2024 return unlikely(map->ops == &bpf_map_offload_ops);
2025 }
2026
2027 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2028 void bpf_map_offload_map_free(struct bpf_map *map);
2029 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2030 const union bpf_attr *kattr,
2031 union bpf_attr __user *uattr);
2032
2033 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2034 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2035 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2036 void sock_map_unhash(struct sock *sk);
2037 void sock_map_close(struct sock *sk, long timeout);
2038 #else
bpf_prog_offload_init(struct bpf_prog * prog,union bpf_attr * attr)2039 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
2040 union bpf_attr *attr)
2041 {
2042 return -EOPNOTSUPP;
2043 }
2044
bpf_prog_is_dev_bound(struct bpf_prog_aux * aux)2045 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
2046 {
2047 return false;
2048 }
2049
bpf_map_is_dev_bound(struct bpf_map * map)2050 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2051 {
2052 return false;
2053 }
2054
bpf_map_offload_map_alloc(union bpf_attr * attr)2055 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2056 {
2057 return ERR_PTR(-EOPNOTSUPP);
2058 }
2059
bpf_map_offload_map_free(struct bpf_map * map)2060 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2061 {
2062 }
2063
bpf_prog_test_run_syscall(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2064 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2065 const union bpf_attr *kattr,
2066 union bpf_attr __user *uattr)
2067 {
2068 return -ENOTSUPP;
2069 }
2070
2071 #ifdef CONFIG_BPF_SYSCALL
sock_map_get_from_fd(const union bpf_attr * attr,struct bpf_prog * prog)2072 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2073 struct bpf_prog *prog)
2074 {
2075 return -EINVAL;
2076 }
2077
sock_map_prog_detach(const union bpf_attr * attr,enum bpf_prog_type ptype)2078 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2079 enum bpf_prog_type ptype)
2080 {
2081 return -EOPNOTSUPP;
2082 }
2083
sock_map_update_elem_sys(struct bpf_map * map,void * key,void * value,u64 flags)2084 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2085 u64 flags)
2086 {
2087 return -EOPNOTSUPP;
2088 }
2089 #endif /* CONFIG_BPF_SYSCALL */
2090 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2091
2092 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2093 void bpf_sk_reuseport_detach(struct sock *sk);
2094 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2095 void *value);
2096 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2097 void *value, u64 map_flags);
2098 #else
bpf_sk_reuseport_detach(struct sock * sk)2099 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2100 {
2101 }
2102
2103 #ifdef CONFIG_BPF_SYSCALL
bpf_fd_reuseport_array_lookup_elem(struct bpf_map * map,void * key,void * value)2104 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2105 void *key, void *value)
2106 {
2107 return -EOPNOTSUPP;
2108 }
2109
bpf_fd_reuseport_array_update_elem(struct bpf_map * map,void * key,void * value,u64 map_flags)2110 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2111 void *key, void *value,
2112 u64 map_flags)
2113 {
2114 return -EOPNOTSUPP;
2115 }
2116 #endif /* CONFIG_BPF_SYSCALL */
2117 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2118
2119 /* verifier prototypes for helper functions called from eBPF programs */
2120 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2121 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2122 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2123 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2124 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2125 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2126
2127 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2128 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2129 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2130 extern const struct bpf_func_proto bpf_tail_call_proto;
2131 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2132 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2133 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2134 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2135 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2136 extern const struct bpf_func_proto bpf_get_stackid_proto;
2137 extern const struct bpf_func_proto bpf_get_stack_proto;
2138 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2139 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2140 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2141 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2142 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2143 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2144 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2145 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2146 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2147 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2148 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2149 extern const struct bpf_func_proto bpf_spin_lock_proto;
2150 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2151 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2152 extern const struct bpf_func_proto bpf_strtol_proto;
2153 extern const struct bpf_func_proto bpf_strtoul_proto;
2154 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2155 extern const struct bpf_func_proto bpf_jiffies64_proto;
2156 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2157 extern const struct bpf_func_proto bpf_event_output_data_proto;
2158 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2159 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2160 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2161 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2162 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2163 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2164 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2165 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2166 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2167 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2168 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2169 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2170 extern const struct bpf_func_proto bpf_snprintf_proto;
2171 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2172 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2173 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2174 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2175 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2176 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2177 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2178 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2179 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2180 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2181 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2182
2183 const struct bpf_func_proto *tracing_prog_func_proto(
2184 enum bpf_func_id func_id, const struct bpf_prog *prog);
2185
2186 /* Shared helpers among cBPF and eBPF. */
2187 void bpf_user_rnd_init_once(void);
2188 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2189 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2190
2191 #if defined(CONFIG_NET)
2192 bool bpf_sock_common_is_valid_access(int off, int size,
2193 enum bpf_access_type type,
2194 struct bpf_insn_access_aux *info);
2195 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2196 struct bpf_insn_access_aux *info);
2197 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2198 const struct bpf_insn *si,
2199 struct bpf_insn *insn_buf,
2200 struct bpf_prog *prog,
2201 u32 *target_size);
2202 #else
bpf_sock_common_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)2203 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2204 enum bpf_access_type type,
2205 struct bpf_insn_access_aux *info)
2206 {
2207 return false;
2208 }
bpf_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)2209 static inline bool bpf_sock_is_valid_access(int off, int size,
2210 enum bpf_access_type type,
2211 struct bpf_insn_access_aux *info)
2212 {
2213 return false;
2214 }
bpf_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)2215 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2216 const struct bpf_insn *si,
2217 struct bpf_insn *insn_buf,
2218 struct bpf_prog *prog,
2219 u32 *target_size)
2220 {
2221 return 0;
2222 }
2223 #endif
2224
2225 #ifdef CONFIG_INET
2226 struct sk_reuseport_kern {
2227 struct sk_buff *skb;
2228 struct sock *sk;
2229 struct sock *selected_sk;
2230 struct sock *migrating_sk;
2231 void *data_end;
2232 u32 hash;
2233 u32 reuseport_id;
2234 bool bind_inany;
2235 };
2236 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2237 struct bpf_insn_access_aux *info);
2238
2239 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2240 const struct bpf_insn *si,
2241 struct bpf_insn *insn_buf,
2242 struct bpf_prog *prog,
2243 u32 *target_size);
2244
2245 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2246 struct bpf_insn_access_aux *info);
2247
2248 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2249 const struct bpf_insn *si,
2250 struct bpf_insn *insn_buf,
2251 struct bpf_prog *prog,
2252 u32 *target_size);
2253 #else
bpf_tcp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)2254 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2255 enum bpf_access_type type,
2256 struct bpf_insn_access_aux *info)
2257 {
2258 return false;
2259 }
2260
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)2261 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2262 const struct bpf_insn *si,
2263 struct bpf_insn *insn_buf,
2264 struct bpf_prog *prog,
2265 u32 *target_size)
2266 {
2267 return 0;
2268 }
bpf_xdp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)2269 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2270 enum bpf_access_type type,
2271 struct bpf_insn_access_aux *info)
2272 {
2273 return false;
2274 }
2275
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)2276 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2277 const struct bpf_insn *si,
2278 struct bpf_insn *insn_buf,
2279 struct bpf_prog *prog,
2280 u32 *target_size)
2281 {
2282 return 0;
2283 }
2284 #endif /* CONFIG_INET */
2285
2286 enum bpf_text_poke_type {
2287 BPF_MOD_CALL,
2288 BPF_MOD_JUMP,
2289 };
2290
2291 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2292 void *addr1, void *addr2);
2293
2294 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
2295 struct bpf_prog *new, struct bpf_prog *old);
2296
2297 struct btf_id_set;
2298 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2299
2300 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2301 u32 **bin_buf, u32 num_args);
2302 void bpf_bprintf_cleanup(void);
2303
2304 #endif /* _LINUX_BPF_H */
2305