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