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