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