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TOMOYO Linux Cross Reference
Linux/include/linux/bpf.h

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  1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
  2  *
  3  * This program is free software; you can redistribute it and/or
  4  * modify it under the terms of version 2 of the GNU General Public
  5  * License as published by the Free Software Foundation.
  6  */
  7 #ifndef _LINUX_BPF_H
  8 #define _LINUX_BPF_H 1
  9 
 10 #include <uapi/linux/bpf.h>
 11 
 12 #include <linux/workqueue.h>
 13 #include <linux/file.h>
 14 #include <linux/percpu.h>
 15 #include <linux/err.h>
 16 #include <linux/rbtree_latch.h>
 17 #include <linux/numa.h>
 18 #include <linux/wait.h>
 19 
 20 struct bpf_verifier_env;
 21 struct perf_event;
 22 struct bpf_prog;
 23 struct bpf_map;
 24 struct sock;
 25 
 26 /* map is generic key/value storage optionally accesible by eBPF programs */
 27 struct bpf_map_ops {
 28         /* funcs callable from userspace (via syscall) */
 29         int (*map_alloc_check)(union bpf_attr *attr);
 30         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
 31         void (*map_release)(struct bpf_map *map, struct file *map_file);
 32         void (*map_free)(struct bpf_map *map);
 33         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
 34         void (*map_release_uref)(struct bpf_map *map);
 35 
 36         /* funcs callable from userspace and from eBPF programs */
 37         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
 38         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
 39         int (*map_delete_elem)(struct bpf_map *map, void *key);
 40 
 41         /* funcs called by prog_array and perf_event_array map */
 42         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
 43                                 int fd);
 44         void (*map_fd_put_ptr)(void *ptr);
 45         u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
 46         u32 (*map_fd_sys_lookup_elem)(void *ptr);
 47 };
 48 
 49 struct bpf_map {
 50         /* 1st cacheline with read-mostly members of which some
 51          * are also accessed in fast-path (e.g. ops, max_entries).
 52          */
 53         const struct bpf_map_ops *ops ____cacheline_aligned;
 54         struct bpf_map *inner_map_meta;
 55 #ifdef CONFIG_SECURITY
 56         void *security;
 57 #endif
 58         enum bpf_map_type map_type;
 59         u32 key_size;
 60         u32 value_size;
 61         u32 max_entries;
 62         u32 map_flags;
 63         u32 pages;
 64         u32 id;
 65         int numa_node;
 66         bool unpriv_array;
 67         /* 7 bytes hole */
 68 
 69         /* 2nd cacheline with misc members to avoid false sharing
 70          * particularly with refcounting.
 71          */
 72         struct user_struct *user ____cacheline_aligned;
 73         atomic_t refcnt;
 74         atomic_t usercnt;
 75         struct work_struct work;
 76         char name[BPF_OBJ_NAME_LEN];
 77 };
 78 
 79 struct bpf_offloaded_map;
 80 
 81 struct bpf_map_dev_ops {
 82         int (*map_get_next_key)(struct bpf_offloaded_map *map,
 83                                 void *key, void *next_key);
 84         int (*map_lookup_elem)(struct bpf_offloaded_map *map,
 85                                void *key, void *value);
 86         int (*map_update_elem)(struct bpf_offloaded_map *map,
 87                                void *key, void *value, u64 flags);
 88         int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
 89 };
 90 
 91 struct bpf_offloaded_map {
 92         struct bpf_map map;
 93         struct net_device *netdev;
 94         const struct bpf_map_dev_ops *dev_ops;
 95         void *dev_priv;
 96         struct list_head offloads;
 97 };
 98 
 99 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
100 {
101         return container_of(map, struct bpf_offloaded_map, map);
102 }
103 
104 extern const struct bpf_map_ops bpf_map_offload_ops;
105 
106 /* function argument constraints */
107 enum bpf_arg_type {
108         ARG_DONTCARE = 0,       /* unused argument in helper function */
109 
110         /* the following constraints used to prototype
111          * bpf_map_lookup/update/delete_elem() functions
112          */
113         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
114         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
115         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
116 
117         /* the following constraints used to prototype bpf_memcmp() and other
118          * functions that access data on eBPF program stack
119          */
120         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
121         ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
122         ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
123                                  * helper function must fill all bytes or clear
124                                  * them in error case.
125                                  */
126 
127         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
128         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
129 
130         ARG_PTR_TO_CTX,         /* pointer to context */
131         ARG_ANYTHING,           /* any (initialized) argument is ok */
132 };
133 
134 /* type of values returned from helper functions */
135 enum bpf_return_type {
136         RET_INTEGER,                    /* function returns integer */
137         RET_VOID,                       /* function doesn't return anything */
138         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
139 };
140 
141 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
142  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
143  * instructions after verifying
144  */
145 struct bpf_func_proto {
146         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
147         bool gpl_only;
148         bool pkt_access;
149         enum bpf_return_type ret_type;
150         enum bpf_arg_type arg1_type;
151         enum bpf_arg_type arg2_type;
152         enum bpf_arg_type arg3_type;
153         enum bpf_arg_type arg4_type;
154         enum bpf_arg_type arg5_type;
155 };
156 
157 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
158  * the first argument to eBPF programs.
159  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
160  */
161 struct bpf_context;
162 
163 enum bpf_access_type {
164         BPF_READ = 1,
165         BPF_WRITE = 2
166 };
167 
168 /* types of values stored in eBPF registers */
169 /* Pointer types represent:
170  * pointer
171  * pointer + imm
172  * pointer + (u16) var
173  * pointer + (u16) var + imm
174  * if (range > 0) then [ptr, ptr + range - off) is safe to access
175  * if (id > 0) means that some 'var' was added
176  * if (off > 0) means that 'imm' was added
177  */
178 enum bpf_reg_type {
179         NOT_INIT = 0,            /* nothing was written into register */
180         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
181         PTR_TO_CTX,              /* reg points to bpf_context */
182         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
183         PTR_TO_MAP_VALUE,        /* reg points to map element value */
184         PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
185         PTR_TO_STACK,            /* reg == frame_pointer + offset */
186         PTR_TO_PACKET_META,      /* skb->data - meta_len */
187         PTR_TO_PACKET,           /* reg points to skb->data */
188         PTR_TO_PACKET_END,       /* skb->data + headlen */
189 };
190 
191 /* The information passed from prog-specific *_is_valid_access
192  * back to the verifier.
193  */
194 struct bpf_insn_access_aux {
195         enum bpf_reg_type reg_type;
196         int ctx_field_size;
197 };
198 
199 static inline void
200 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
201 {
202         aux->ctx_field_size = size;
203 }
204 
205 struct bpf_prog_ops {
206         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
207                         union bpf_attr __user *uattr);
208 };
209 
210 struct bpf_verifier_ops {
211         /* return eBPF function prototype for verification */
212         const struct bpf_func_proto *
213         (*get_func_proto)(enum bpf_func_id func_id,
214                           const struct bpf_prog *prog);
215 
216         /* return true if 'size' wide access at offset 'off' within bpf_context
217          * with 'type' (read or write) is allowed
218          */
219         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
220                                 const struct bpf_prog *prog,
221                                 struct bpf_insn_access_aux *info);
222         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
223                             const struct bpf_prog *prog);
224         u32 (*convert_ctx_access)(enum bpf_access_type type,
225                                   const struct bpf_insn *src,
226                                   struct bpf_insn *dst,
227                                   struct bpf_prog *prog, u32 *target_size);
228 };
229 
230 struct bpf_prog_offload_ops {
231         int (*insn_hook)(struct bpf_verifier_env *env,
232                          int insn_idx, int prev_insn_idx);
233 };
234 
235 struct bpf_prog_offload {
236         struct bpf_prog         *prog;
237         struct net_device       *netdev;
238         void                    *dev_priv;
239         struct list_head        offloads;
240         bool                    dev_state;
241         const struct bpf_prog_offload_ops *dev_ops;
242         void                    *jited_image;
243         u32                     jited_len;
244 };
245 
246 struct bpf_prog_aux {
247         atomic_t refcnt;
248         u32 used_map_cnt;
249         u32 max_ctx_offset;
250         u32 stack_depth;
251         u32 id;
252         u32 func_cnt;
253         bool offload_requested;
254         struct bpf_prog **func;
255         void *jit_data; /* JIT specific data. arch dependent */
256         struct latch_tree_node ksym_tnode;
257         struct list_head ksym_lnode;
258         const struct bpf_prog_ops *ops;
259         struct bpf_map **used_maps;
260         struct bpf_prog *prog;
261         struct user_struct *user;
262         u64 load_time; /* ns since boottime */
263         char name[BPF_OBJ_NAME_LEN];
264 #ifdef CONFIG_SECURITY
265         void *security;
266 #endif
267         struct bpf_prog_offload *offload;
268         union {
269                 struct work_struct work;
270                 struct rcu_head rcu;
271         };
272 };
273 
274 struct bpf_array {
275         struct bpf_map map;
276         u32 elem_size;
277         u32 index_mask;
278         /* 'ownership' of prog_array is claimed by the first program that
279          * is going to use this map or by the first program which FD is stored
280          * in the map to make sure that all callers and callees have the same
281          * prog_type and JITed flag
282          */
283         enum bpf_prog_type owner_prog_type;
284         bool owner_jited;
285         union {
286                 char value[0] __aligned(8);
287                 void *ptrs[0] __aligned(8);
288                 void __percpu *pptrs[0] __aligned(8);
289         };
290 };
291 
292 #define MAX_TAIL_CALL_CNT 32
293 
294 struct bpf_event_entry {
295         struct perf_event *event;
296         struct file *perf_file;
297         struct file *map_file;
298         struct rcu_head rcu;
299 };
300 
301 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
302 int bpf_prog_calc_tag(struct bpf_prog *fp);
303 
304 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
305 
306 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
307                                         unsigned long off, unsigned long len);
308 
309 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
310                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
311 
312 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
313                           union bpf_attr __user *uattr);
314 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
315                           union bpf_attr __user *uattr);
316 
317 /* an array of programs to be executed under rcu_lock.
318  *
319  * Typical usage:
320  * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
321  *
322  * the structure returned by bpf_prog_array_alloc() should be populated
323  * with program pointers and the last pointer must be NULL.
324  * The user has to keep refcnt on the program and make sure the program
325  * is removed from the array before bpf_prog_put().
326  * The 'struct bpf_prog_array *' should only be replaced with xchg()
327  * since other cpus are walking the array of pointers in parallel.
328  */
329 struct bpf_prog_array {
330         struct rcu_head rcu;
331         struct bpf_prog *progs[0];
332 };
333 
334 struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
335 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs);
336 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs);
337 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
338                                 __u32 __user *prog_ids, u32 cnt);
339 
340 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs,
341                                 struct bpf_prog *old_prog);
342 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array,
343                              u32 *prog_ids, u32 request_cnt,
344                              u32 *prog_cnt);
345 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
346                         struct bpf_prog *exclude_prog,
347                         struct bpf_prog *include_prog,
348                         struct bpf_prog_array **new_array);
349 
350 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
351         ({                                              \
352                 struct bpf_prog **_prog, *__prog;       \
353                 struct bpf_prog_array *_array;          \
354                 u32 _ret = 1;                           \
355                 preempt_disable();                      \
356                 rcu_read_lock();                        \
357                 _array = rcu_dereference(array);        \
358                 if (unlikely(check_non_null && !_array))\
359                         goto _out;                      \
360                 _prog = _array->progs;                  \
361                 while ((__prog = READ_ONCE(*_prog))) {  \
362                         _ret &= func(__prog, ctx);      \
363                         _prog++;                        \
364                 }                                       \
365 _out:                                                   \
366                 rcu_read_unlock();                      \
367                 preempt_enable_no_resched();            \
368                 _ret;                                   \
369          })
370 
371 #define BPF_PROG_RUN_ARRAY(array, ctx, func)            \
372         __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
373 
374 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)      \
375         __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
376 
377 #ifdef CONFIG_BPF_SYSCALL
378 DECLARE_PER_CPU(int, bpf_prog_active);
379 
380 extern const struct file_operations bpf_map_fops;
381 extern const struct file_operations bpf_prog_fops;
382 
383 #define BPF_PROG_TYPE(_id, _name) \
384         extern const struct bpf_prog_ops _name ## _prog_ops; \
385         extern const struct bpf_verifier_ops _name ## _verifier_ops;
386 #define BPF_MAP_TYPE(_id, _ops) \
387         extern const struct bpf_map_ops _ops;
388 #include <linux/bpf_types.h>
389 #undef BPF_PROG_TYPE
390 #undef BPF_MAP_TYPE
391 
392 extern const struct bpf_prog_ops bpf_offload_prog_ops;
393 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
394 extern const struct bpf_verifier_ops xdp_analyzer_ops;
395 
396 struct bpf_prog *bpf_prog_get(u32 ufd);
397 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
398                                        bool attach_drv);
399 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
400 void bpf_prog_sub(struct bpf_prog *prog, int i);
401 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
402 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
403 void bpf_prog_put(struct bpf_prog *prog);
404 int __bpf_prog_charge(struct user_struct *user, u32 pages);
405 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
406 
407 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
408 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
409 
410 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
411 struct bpf_map *__bpf_map_get(struct fd f);
412 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
413 void bpf_map_put_with_uref(struct bpf_map *map);
414 void bpf_map_put(struct bpf_map *map);
415 int bpf_map_precharge_memlock(u32 pages);
416 void *bpf_map_area_alloc(size_t size, int numa_node);
417 void bpf_map_area_free(void *base);
418 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
419 
420 extern int sysctl_unprivileged_bpf_disabled;
421 
422 int bpf_map_new_fd(struct bpf_map *map, int flags);
423 int bpf_prog_new_fd(struct bpf_prog *prog);
424 
425 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
426 int bpf_obj_get_user(const char __user *pathname, int flags);
427 
428 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
429 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
430 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
431                            u64 flags);
432 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
433                             u64 flags);
434 
435 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
436 
437 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
438                                  void *key, void *value, u64 map_flags);
439 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
440 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
441                                 void *key, void *value, u64 map_flags);
442 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
443 
444 int bpf_get_file_flag(int flags);
445 
446 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
447  * forced to use 'long' read/writes to try to atomically copy long counters.
448  * Best-effort only.  No barriers here, since it _will_ race with concurrent
449  * updates from BPF programs. Called from bpf syscall and mostly used with
450  * size 8 or 16 bytes, so ask compiler to inline it.
451  */
452 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
453 {
454         const long *lsrc = src;
455         long *ldst = dst;
456 
457         size /= sizeof(long);
458         while (size--)
459                 *ldst++ = *lsrc++;
460 }
461 
462 /* verify correctness of eBPF program */
463 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
464 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
465 
466 /* Map specifics */
467 struct net_device  *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
468 void __dev_map_insert_ctx(struct bpf_map *map, u32 index);
469 void __dev_map_flush(struct bpf_map *map);
470 
471 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
472 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);
473 void __cpu_map_flush(struct bpf_map *map);
474 struct xdp_buff;
475 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
476                     struct net_device *dev_rx);
477 
478 /* Return map's numa specified by userspace */
479 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
480 {
481         return (attr->map_flags & BPF_F_NUMA_NODE) ?
482                 attr->numa_node : NUMA_NO_NODE;
483 }
484 
485 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
486 
487 #else /* !CONFIG_BPF_SYSCALL */
488 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
489 {
490         return ERR_PTR(-EOPNOTSUPP);
491 }
492 
493 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
494                                                      enum bpf_prog_type type,
495                                                      bool attach_drv)
496 {
497         return ERR_PTR(-EOPNOTSUPP);
498 }
499 
500 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
501                                                           int i)
502 {
503         return ERR_PTR(-EOPNOTSUPP);
504 }
505 
506 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
507 {
508 }
509 
510 static inline void bpf_prog_put(struct bpf_prog *prog)
511 {
512 }
513 
514 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
515 {
516         return ERR_PTR(-EOPNOTSUPP);
517 }
518 
519 static inline struct bpf_prog *__must_check
520 bpf_prog_inc_not_zero(struct bpf_prog *prog)
521 {
522         return ERR_PTR(-EOPNOTSUPP);
523 }
524 
525 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
526 {
527         return 0;
528 }
529 
530 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
531 {
532 }
533 
534 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
535 {
536         return -EOPNOTSUPP;
537 }
538 
539 static inline struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
540                                                        u32 key)
541 {
542         return NULL;
543 }
544 
545 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index)
546 {
547 }
548 
549 static inline void __dev_map_flush(struct bpf_map *map)
550 {
551 }
552 
553 static inline
554 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
555 {
556         return NULL;
557 }
558 
559 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index)
560 {
561 }
562 
563 static inline void __cpu_map_flush(struct bpf_map *map)
564 {
565 }
566 
567 struct xdp_buff;
568 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
569                                   struct xdp_buff *xdp,
570                                   struct net_device *dev_rx)
571 {
572         return 0;
573 }
574 
575 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
576                                 enum bpf_prog_type type)
577 {
578         return ERR_PTR(-EOPNOTSUPP);
579 }
580 #endif /* CONFIG_BPF_SYSCALL */
581 
582 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
583                                                  enum bpf_prog_type type)
584 {
585         return bpf_prog_get_type_dev(ufd, type, false);
586 }
587 
588 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
589 
590 int bpf_prog_offload_compile(struct bpf_prog *prog);
591 void bpf_prog_offload_destroy(struct bpf_prog *prog);
592 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
593                                struct bpf_prog *prog);
594 
595 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
596 
597 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
598 int bpf_map_offload_update_elem(struct bpf_map *map,
599                                 void *key, void *value, u64 flags);
600 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
601 int bpf_map_offload_get_next_key(struct bpf_map *map,
602                                  void *key, void *next_key);
603 
604 bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map);
605 
606 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
607 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
608 
609 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
610 {
611         return aux->offload_requested;
612 }
613 
614 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
615 {
616         return unlikely(map->ops == &bpf_map_offload_ops);
617 }
618 
619 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
620 void bpf_map_offload_map_free(struct bpf_map *map);
621 #else
622 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
623                                         union bpf_attr *attr)
624 {
625         return -EOPNOTSUPP;
626 }
627 
628 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
629 {
630         return false;
631 }
632 
633 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
634 {
635         return false;
636 }
637 
638 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
639 {
640         return ERR_PTR(-EOPNOTSUPP);
641 }
642 
643 static inline void bpf_map_offload_map_free(struct bpf_map *map)
644 {
645 }
646 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
647 
648 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET)
649 struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
650 int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type);
651 #else
652 static inline struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
653 {
654         return NULL;
655 }
656 
657 static inline int sock_map_prog(struct bpf_map *map,
658                                 struct bpf_prog *prog,
659                                 u32 type)
660 {
661         return -EOPNOTSUPP;
662 }
663 #endif
664 
665 /* verifier prototypes for helper functions called from eBPF programs */
666 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
667 extern const struct bpf_func_proto bpf_map_update_elem_proto;
668 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
669 
670 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
671 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
672 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
673 extern const struct bpf_func_proto bpf_tail_call_proto;
674 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
675 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
676 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
677 extern const struct bpf_func_proto bpf_get_current_comm_proto;
678 extern const struct bpf_func_proto bpf_skb_vlan_push_proto;
679 extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
680 extern const struct bpf_func_proto bpf_get_stackid_proto;
681 extern const struct bpf_func_proto bpf_sock_map_update_proto;
682 
683 /* Shared helpers among cBPF and eBPF. */
684 void bpf_user_rnd_init_once(void);
685 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
686 
687 #endif /* _LINUX_BPF_H */
688 

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