~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.19-rc3 ] ~ [ linux-5.18.5 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.48 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.123 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.199 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.248 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.284 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.319 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/wait.h>
 16 #include <linux/u64_stats_sync.h>
 17 
 18 struct bpf_verifier_env;
 19 struct perf_event;
 20 struct bpf_prog;
 21 struct bpf_map;
 22 struct sock;
 23 struct seq_file;
 24 struct btf;
 25 struct btf_type;
 26 
 27 /* map is generic key/value storage optionally accesible by eBPF programs */
 28 struct bpf_map_ops {
 29         /* funcs callable from userspace (via syscall) */
 30         int (*map_alloc_check)(union bpf_attr *attr);
 31         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
 32         void (*map_release)(struct bpf_map *map, struct file *map_file);
 33         void (*map_free)(struct bpf_map *map);
 34         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
 35         void (*map_release_uref)(struct bpf_map *map);
 36         void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
 37 
 38         /* funcs callable from userspace and from eBPF programs */
 39         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
 40         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
 41         int (*map_delete_elem)(struct bpf_map *map, void *key);
 42         int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
 43         int (*map_pop_elem)(struct bpf_map *map, void *value);
 44         int (*map_peek_elem)(struct bpf_map *map, void *value);
 45 
 46         /* funcs called by prog_array and perf_event_array map */
 47         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
 48                                 int fd);
 49         void (*map_fd_put_ptr)(void *ptr);
 50         u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
 51         u32 (*map_fd_sys_lookup_elem)(void *ptr);
 52         void (*map_seq_show_elem)(struct bpf_map *map, void *key,
 53                                   struct seq_file *m);
 54         int (*map_check_btf)(const struct bpf_map *map,
 55                              const struct btf *btf,
 56                              const struct btf_type *key_type,
 57                              const struct btf_type *value_type);
 58 
 59         /* Direct value access helpers. */
 60         int (*map_direct_value_addr)(const struct bpf_map *map,
 61                                      u64 *imm, u32 off);
 62         int (*map_direct_value_meta)(const struct bpf_map *map,
 63                                      u64 imm, u32 *off);
 64 };
 65 
 66 struct bpf_map {
 67         /* The first two cachelines with read-mostly members of which some
 68          * are also accessed in fast-path (e.g. ops, max_entries).
 69          */
 70         const struct bpf_map_ops *ops ____cacheline_aligned;
 71         struct bpf_map *inner_map_meta;
 72 #ifdef CONFIG_SECURITY
 73         void *security;
 74 #endif
 75         enum bpf_map_type map_type;
 76         u32 key_size;
 77         u32 value_size;
 78         u32 max_entries;
 79         u32 map_flags;
 80         int spin_lock_off; /* >=0 valid offset, <0 error */
 81         u32 id;
 82         int numa_node;
 83         u32 btf_key_type_id;
 84         u32 btf_value_type_id;
 85         struct btf *btf;
 86         u32 pages;
 87         bool unpriv_array;
 88         bool frozen; /* write-once */
 89         /* 48 bytes hole */
 90 
 91         /* The 3rd and 4th cacheline with misc members to avoid false sharing
 92          * particularly with refcounting.
 93          */
 94         struct user_struct *user ____cacheline_aligned;
 95         atomic_t refcnt;
 96         atomic_t usercnt;
 97         struct work_struct work;
 98         char name[BPF_OBJ_NAME_LEN];
 99 };
100 
101 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
102 {
103         return map->spin_lock_off >= 0;
104 }
105 
106 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
107 {
108         if (likely(!map_value_has_spin_lock(map)))
109                 return;
110         *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
111                 (struct bpf_spin_lock){};
112 }
113 
114 /* copy everything but bpf_spin_lock */
115 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
116 {
117         if (unlikely(map_value_has_spin_lock(map))) {
118                 u32 off = map->spin_lock_off;
119 
120                 memcpy(dst, src, off);
121                 memcpy(dst + off + sizeof(struct bpf_spin_lock),
122                        src + off + sizeof(struct bpf_spin_lock),
123                        map->value_size - off - sizeof(struct bpf_spin_lock));
124         } else {
125                 memcpy(dst, src, map->value_size);
126         }
127 }
128 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
129                            bool lock_src);
130 
131 struct bpf_offload_dev;
132 struct bpf_offloaded_map;
133 
134 struct bpf_map_dev_ops {
135         int (*map_get_next_key)(struct bpf_offloaded_map *map,
136                                 void *key, void *next_key);
137         int (*map_lookup_elem)(struct bpf_offloaded_map *map,
138                                void *key, void *value);
139         int (*map_update_elem)(struct bpf_offloaded_map *map,
140                                void *key, void *value, u64 flags);
141         int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
142 };
143 
144 struct bpf_offloaded_map {
145         struct bpf_map map;
146         struct net_device *netdev;
147         const struct bpf_map_dev_ops *dev_ops;
148         void *dev_priv;
149         struct list_head offloads;
150 };
151 
152 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
153 {
154         return container_of(map, struct bpf_offloaded_map, map);
155 }
156 
157 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
158 {
159         return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
160 }
161 
162 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
163 {
164         return map->btf && map->ops->map_seq_show_elem;
165 }
166 
167 int map_check_no_btf(const struct bpf_map *map,
168                      const struct btf *btf,
169                      const struct btf_type *key_type,
170                      const struct btf_type *value_type);
171 
172 extern const struct bpf_map_ops bpf_map_offload_ops;
173 
174 /* function argument constraints */
175 enum bpf_arg_type {
176         ARG_DONTCARE = 0,       /* unused argument in helper function */
177 
178         /* the following constraints used to prototype
179          * bpf_map_lookup/update/delete_elem() functions
180          */
181         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
182         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
183         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
184         ARG_PTR_TO_UNINIT_MAP_VALUE,    /* pointer to valid memory used to store a map value */
185         ARG_PTR_TO_MAP_VALUE_OR_NULL,   /* pointer to stack used as map value or NULL */
186 
187         /* the following constraints used to prototype bpf_memcmp() and other
188          * functions that access data on eBPF program stack
189          */
190         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
191         ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
192         ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
193                                  * helper function must fill all bytes or clear
194                                  * them in error case.
195                                  */
196 
197         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
198         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
199 
200         ARG_PTR_TO_CTX,         /* pointer to context */
201         ARG_ANYTHING,           /* any (initialized) argument is ok */
202         ARG_PTR_TO_SPIN_LOCK,   /* pointer to bpf_spin_lock */
203         ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
204         ARG_PTR_TO_INT,         /* pointer to int */
205         ARG_PTR_TO_LONG,        /* pointer to long */
206         ARG_PTR_TO_SOCKET,      /* pointer to bpf_sock (fullsock) */
207 };
208 
209 /* type of values returned from helper functions */
210 enum bpf_return_type {
211         RET_INTEGER,                    /* function returns integer */
212         RET_VOID,                       /* function doesn't return anything */
213         RET_PTR_TO_MAP_VALUE,           /* returns a pointer to map elem value */
214         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
215         RET_PTR_TO_SOCKET_OR_NULL,      /* returns a pointer to a socket or NULL */
216         RET_PTR_TO_TCP_SOCK_OR_NULL,    /* returns a pointer to a tcp_sock or NULL */
217         RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
218 };
219 
220 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
221  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
222  * instructions after verifying
223  */
224 struct bpf_func_proto {
225         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
226         bool gpl_only;
227         bool pkt_access;
228         enum bpf_return_type ret_type;
229         enum bpf_arg_type arg1_type;
230         enum bpf_arg_type arg2_type;
231         enum bpf_arg_type arg3_type;
232         enum bpf_arg_type arg4_type;
233         enum bpf_arg_type arg5_type;
234 };
235 
236 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
237  * the first argument to eBPF programs.
238  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
239  */
240 struct bpf_context;
241 
242 enum bpf_access_type {
243         BPF_READ = 1,
244         BPF_WRITE = 2
245 };
246 
247 /* types of values stored in eBPF registers */
248 /* Pointer types represent:
249  * pointer
250  * pointer + imm
251  * pointer + (u16) var
252  * pointer + (u16) var + imm
253  * if (range > 0) then [ptr, ptr + range - off) is safe to access
254  * if (id > 0) means that some 'var' was added
255  * if (off > 0) means that 'imm' was added
256  */
257 enum bpf_reg_type {
258         NOT_INIT = 0,            /* nothing was written into register */
259         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
260         PTR_TO_CTX,              /* reg points to bpf_context */
261         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
262         PTR_TO_MAP_VALUE,        /* reg points to map element value */
263         PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
264         PTR_TO_STACK,            /* reg == frame_pointer + offset */
265         PTR_TO_PACKET_META,      /* skb->data - meta_len */
266         PTR_TO_PACKET,           /* reg points to skb->data */
267         PTR_TO_PACKET_END,       /* skb->data + headlen */
268         PTR_TO_FLOW_KEYS,        /* reg points to bpf_flow_keys */
269         PTR_TO_SOCKET,           /* reg points to struct bpf_sock */
270         PTR_TO_SOCKET_OR_NULL,   /* reg points to struct bpf_sock or NULL */
271         PTR_TO_SOCK_COMMON,      /* reg points to sock_common */
272         PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
273         PTR_TO_TCP_SOCK,         /* reg points to struct tcp_sock */
274         PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
275         PTR_TO_TP_BUFFER,        /* reg points to a writable raw tp's buffer */
276 };
277 
278 /* The information passed from prog-specific *_is_valid_access
279  * back to the verifier.
280  */
281 struct bpf_insn_access_aux {
282         enum bpf_reg_type reg_type;
283         int ctx_field_size;
284 };
285 
286 static inline void
287 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
288 {
289         aux->ctx_field_size = size;
290 }
291 
292 struct bpf_prog_ops {
293         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
294                         union bpf_attr __user *uattr);
295 };
296 
297 struct bpf_verifier_ops {
298         /* return eBPF function prototype for verification */
299         const struct bpf_func_proto *
300         (*get_func_proto)(enum bpf_func_id func_id,
301                           const struct bpf_prog *prog);
302 
303         /* return true if 'size' wide access at offset 'off' within bpf_context
304          * with 'type' (read or write) is allowed
305          */
306         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
307                                 const struct bpf_prog *prog,
308                                 struct bpf_insn_access_aux *info);
309         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
310                             const struct bpf_prog *prog);
311         int (*gen_ld_abs)(const struct bpf_insn *orig,
312                           struct bpf_insn *insn_buf);
313         u32 (*convert_ctx_access)(enum bpf_access_type type,
314                                   const struct bpf_insn *src,
315                                   struct bpf_insn *dst,
316                                   struct bpf_prog *prog, u32 *target_size);
317 };
318 
319 struct bpf_prog_offload_ops {
320         /* verifier basic callbacks */
321         int (*insn_hook)(struct bpf_verifier_env *env,
322                          int insn_idx, int prev_insn_idx);
323         int (*finalize)(struct bpf_verifier_env *env);
324         /* verifier optimization callbacks (called after .finalize) */
325         int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
326                             struct bpf_insn *insn);
327         int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
328         /* program management callbacks */
329         int (*prepare)(struct bpf_prog *prog);
330         int (*translate)(struct bpf_prog *prog);
331         void (*destroy)(struct bpf_prog *prog);
332 };
333 
334 struct bpf_prog_offload {
335         struct bpf_prog         *prog;
336         struct net_device       *netdev;
337         struct bpf_offload_dev  *offdev;
338         void                    *dev_priv;
339         struct list_head        offloads;
340         bool                    dev_state;
341         bool                    opt_failed;
342         void                    *jited_image;
343         u32                     jited_len;
344 };
345 
346 enum bpf_cgroup_storage_type {
347         BPF_CGROUP_STORAGE_SHARED,
348         BPF_CGROUP_STORAGE_PERCPU,
349         __BPF_CGROUP_STORAGE_MAX
350 };
351 
352 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
353 
354 struct bpf_prog_stats {
355         u64 cnt;
356         u64 nsecs;
357         struct u64_stats_sync syncp;
358 };
359 
360 struct bpf_prog_aux {
361         atomic_t refcnt;
362         u32 used_map_cnt;
363         u32 max_ctx_offset;
364         u32 max_pkt_offset;
365         u32 max_tp_access;
366         u32 stack_depth;
367         u32 id;
368         u32 func_cnt; /* used by non-func prog as the number of func progs */
369         u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
370         bool offload_requested;
371         struct bpf_prog **func;
372         void *jit_data; /* JIT specific data. arch dependent */
373         struct latch_tree_node ksym_tnode;
374         struct list_head ksym_lnode;
375         const struct bpf_prog_ops *ops;
376         struct bpf_map **used_maps;
377         struct bpf_prog *prog;
378         struct user_struct *user;
379         u64 load_time; /* ns since boottime */
380         struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
381         char name[BPF_OBJ_NAME_LEN];
382 #ifdef CONFIG_SECURITY
383         void *security;
384 #endif
385         struct bpf_prog_offload *offload;
386         struct btf *btf;
387         struct bpf_func_info *func_info;
388         /* bpf_line_info loaded from userspace.  linfo->insn_off
389          * has the xlated insn offset.
390          * Both the main and sub prog share the same linfo.
391          * The subprog can access its first linfo by
392          * using the linfo_idx.
393          */
394         struct bpf_line_info *linfo;
395         /* jited_linfo is the jited addr of the linfo.  It has a
396          * one to one mapping to linfo:
397          * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
398          * Both the main and sub prog share the same jited_linfo.
399          * The subprog can access its first jited_linfo by
400          * using the linfo_idx.
401          */
402         void **jited_linfo;
403         u32 func_info_cnt;
404         u32 nr_linfo;
405         /* subprog can use linfo_idx to access its first linfo and
406          * jited_linfo.
407          * main prog always has linfo_idx == 0
408          */
409         u32 linfo_idx;
410         struct bpf_prog_stats __percpu *stats;
411         union {
412                 struct work_struct work;
413                 struct rcu_head rcu;
414         };
415 };
416 
417 struct bpf_array {
418         struct bpf_map map;
419         u32 elem_size;
420         u32 index_mask;
421         /* 'ownership' of prog_array is claimed by the first program that
422          * is going to use this map or by the first program which FD is stored
423          * in the map to make sure that all callers and callees have the same
424          * prog_type and JITed flag
425          */
426         enum bpf_prog_type owner_prog_type;
427         bool owner_jited;
428         union {
429                 char value[0] __aligned(8);
430                 void *ptrs[0] __aligned(8);
431                 void __percpu *pptrs[0] __aligned(8);
432         };
433 };
434 
435 #define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
436 #define MAX_TAIL_CALL_CNT 32
437 
438 #define BPF_F_ACCESS_MASK       (BPF_F_RDONLY |         \
439                                  BPF_F_RDONLY_PROG |    \
440                                  BPF_F_WRONLY |         \
441                                  BPF_F_WRONLY_PROG)
442 
443 #define BPF_MAP_CAN_READ        BIT(0)
444 #define BPF_MAP_CAN_WRITE       BIT(1)
445 
446 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
447 {
448         u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
449 
450         /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
451          * not possible.
452          */
453         if (access_flags & BPF_F_RDONLY_PROG)
454                 return BPF_MAP_CAN_READ;
455         else if (access_flags & BPF_F_WRONLY_PROG)
456                 return BPF_MAP_CAN_WRITE;
457         else
458                 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
459 }
460 
461 static inline bool bpf_map_flags_access_ok(u32 access_flags)
462 {
463         return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
464                (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
465 }
466 
467 struct bpf_event_entry {
468         struct perf_event *event;
469         struct file *perf_file;
470         struct file *map_file;
471         struct rcu_head rcu;
472 };
473 
474 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
475 int bpf_prog_calc_tag(struct bpf_prog *fp);
476 
477 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
478 
479 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
480                                         unsigned long off, unsigned long len);
481 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
482                                         const struct bpf_insn *src,
483                                         struct bpf_insn *dst,
484                                         struct bpf_prog *prog,
485                                         u32 *target_size);
486 
487 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
488                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
489 
490 /* an array of programs to be executed under rcu_lock.
491  *
492  * Typical usage:
493  * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
494  *
495  * the structure returned by bpf_prog_array_alloc() should be populated
496  * with program pointers and the last pointer must be NULL.
497  * The user has to keep refcnt on the program and make sure the program
498  * is removed from the array before bpf_prog_put().
499  * The 'struct bpf_prog_array *' should only be replaced with xchg()
500  * since other cpus are walking the array of pointers in parallel.
501  */
502 struct bpf_prog_array_item {
503         struct bpf_prog *prog;
504         struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
505 };
506 
507 struct bpf_prog_array {
508         struct rcu_head rcu;
509         struct bpf_prog_array_item items[0];
510 };
511 
512 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
513 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs);
514 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs);
515 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
516                                 __u32 __user *prog_ids, u32 cnt);
517 
518 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs,
519                                 struct bpf_prog *old_prog);
520 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array,
521                              u32 *prog_ids, u32 request_cnt,
522                              u32 *prog_cnt);
523 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
524                         struct bpf_prog *exclude_prog,
525                         struct bpf_prog *include_prog,
526                         struct bpf_prog_array **new_array);
527 
528 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
529         ({                                              \
530                 struct bpf_prog_array_item *_item;      \
531                 struct bpf_prog *_prog;                 \
532                 struct bpf_prog_array *_array;          \
533                 u32 _ret = 1;                           \
534                 preempt_disable();                      \
535                 rcu_read_lock();                        \
536                 _array = rcu_dereference(array);        \
537                 if (unlikely(check_non_null && !_array))\
538                         goto _out;                      \
539                 _item = &_array->items[0];              \
540                 while ((_prog = READ_ONCE(_item->prog))) {              \
541                         bpf_cgroup_storage_set(_item->cgroup_storage);  \
542                         _ret &= func(_prog, ctx);       \
543                         _item++;                        \
544                 }                                       \
545 _out:                                                   \
546                 rcu_read_unlock();                      \
547                 preempt_enable();                       \
548                 _ret;                                   \
549          })
550 
551 #define BPF_PROG_RUN_ARRAY(array, ctx, func)            \
552         __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
553 
554 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)      \
555         __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
556 
557 #ifdef CONFIG_BPF_SYSCALL
558 DECLARE_PER_CPU(int, bpf_prog_active);
559 
560 extern const struct file_operations bpf_map_fops;
561 extern const struct file_operations bpf_prog_fops;
562 
563 #define BPF_PROG_TYPE(_id, _name) \
564         extern const struct bpf_prog_ops _name ## _prog_ops; \
565         extern const struct bpf_verifier_ops _name ## _verifier_ops;
566 #define BPF_MAP_TYPE(_id, _ops) \
567         extern const struct bpf_map_ops _ops;
568 #include <linux/bpf_types.h>
569 #undef BPF_PROG_TYPE
570 #undef BPF_MAP_TYPE
571 
572 extern const struct bpf_prog_ops bpf_offload_prog_ops;
573 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
574 extern const struct bpf_verifier_ops xdp_analyzer_ops;
575 
576 struct bpf_prog *bpf_prog_get(u32 ufd);
577 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
578                                        bool attach_drv);
579 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
580 void bpf_prog_sub(struct bpf_prog *prog, int i);
581 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
582 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
583 void bpf_prog_put(struct bpf_prog *prog);
584 int __bpf_prog_charge(struct user_struct *user, u32 pages);
585 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
586 
587 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
588 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
589 
590 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
591 struct bpf_map *__bpf_map_get(struct fd f);
592 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
593 void bpf_map_put_with_uref(struct bpf_map *map);
594 void bpf_map_put(struct bpf_map *map);
595 int bpf_map_precharge_memlock(u32 pages);
596 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
597 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
598 void *bpf_map_area_alloc(size_t size, int numa_node);
599 void bpf_map_area_free(void *base);
600 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
601 
602 extern int sysctl_unprivileged_bpf_disabled;
603 
604 int bpf_map_new_fd(struct bpf_map *map, int flags);
605 int bpf_prog_new_fd(struct bpf_prog *prog);
606 
607 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
608 int bpf_obj_get_user(const char __user *pathname, int flags);
609 
610 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
611 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
612 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
613                            u64 flags);
614 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
615                             u64 flags);
616 
617 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
618 
619 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
620                                  void *key, void *value, u64 map_flags);
621 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
622 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
623                                 void *key, void *value, u64 map_flags);
624 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
625 
626 int bpf_get_file_flag(int flags);
627 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
628                              size_t actual_size);
629 
630 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
631  * forced to use 'long' read/writes to try to atomically copy long counters.
632  * Best-effort only.  No barriers here, since it _will_ race with concurrent
633  * updates from BPF programs. Called from bpf syscall and mostly used with
634  * size 8 or 16 bytes, so ask compiler to inline it.
635  */
636 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
637 {
638         const long *lsrc = src;
639         long *ldst = dst;
640 
641         size /= sizeof(long);
642         while (size--)
643                 *ldst++ = *lsrc++;
644 }
645 
646 /* verify correctness of eBPF program */
647 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
648               union bpf_attr __user *uattr);
649 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
650 
651 /* Map specifics */
652 struct xdp_buff;
653 struct sk_buff;
654 
655 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
656 void __dev_map_insert_ctx(struct bpf_map *map, u32 index);
657 void __dev_map_flush(struct bpf_map *map);
658 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
659                     struct net_device *dev_rx);
660 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
661                              struct bpf_prog *xdp_prog);
662 
663 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
664 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);
665 void __cpu_map_flush(struct bpf_map *map);
666 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
667                     struct net_device *dev_rx);
668 
669 /* Return map's numa specified by userspace */
670 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
671 {
672         return (attr->map_flags & BPF_F_NUMA_NODE) ?
673                 attr->numa_node : NUMA_NO_NODE;
674 }
675 
676 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
677 int array_map_alloc_check(union bpf_attr *attr);
678 
679 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
680                           union bpf_attr __user *uattr);
681 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
682                           union bpf_attr __user *uattr);
683 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
684                                      const union bpf_attr *kattr,
685                                      union bpf_attr __user *uattr);
686 #else /* !CONFIG_BPF_SYSCALL */
687 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
688 {
689         return ERR_PTR(-EOPNOTSUPP);
690 }
691 
692 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
693                                                      enum bpf_prog_type type,
694                                                      bool attach_drv)
695 {
696         return ERR_PTR(-EOPNOTSUPP);
697 }
698 
699 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
700                                                           int i)
701 {
702         return ERR_PTR(-EOPNOTSUPP);
703 }
704 
705 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
706 {
707 }
708 
709 static inline void bpf_prog_put(struct bpf_prog *prog)
710 {
711 }
712 
713 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
714 {
715         return ERR_PTR(-EOPNOTSUPP);
716 }
717 
718 static inline struct bpf_prog *__must_check
719 bpf_prog_inc_not_zero(struct bpf_prog *prog)
720 {
721         return ERR_PTR(-EOPNOTSUPP);
722 }
723 
724 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
725 {
726         return 0;
727 }
728 
729 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
730 {
731 }
732 
733 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
734 {
735         return -EOPNOTSUPP;
736 }
737 
738 static inline struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
739                                                        u32 key)
740 {
741         return NULL;
742 }
743 
744 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index)
745 {
746 }
747 
748 static inline void __dev_map_flush(struct bpf_map *map)
749 {
750 }
751 
752 struct xdp_buff;
753 struct bpf_dtab_netdev;
754 
755 static inline
756 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
757                     struct net_device *dev_rx)
758 {
759         return 0;
760 }
761 
762 struct sk_buff;
763 
764 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
765                                            struct sk_buff *skb,
766                                            struct bpf_prog *xdp_prog)
767 {
768         return 0;
769 }
770 
771 static inline
772 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
773 {
774         return NULL;
775 }
776 
777 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index)
778 {
779 }
780 
781 static inline void __cpu_map_flush(struct bpf_map *map)
782 {
783 }
784 
785 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
786                                   struct xdp_buff *xdp,
787                                   struct net_device *dev_rx)
788 {
789         return 0;
790 }
791 
792 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
793                                 enum bpf_prog_type type)
794 {
795         return ERR_PTR(-EOPNOTSUPP);
796 }
797 
798 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
799                                         const union bpf_attr *kattr,
800                                         union bpf_attr __user *uattr)
801 {
802         return -ENOTSUPP;
803 }
804 
805 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
806                                         const union bpf_attr *kattr,
807                                         union bpf_attr __user *uattr)
808 {
809         return -ENOTSUPP;
810 }
811 
812 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
813                                                    const union bpf_attr *kattr,
814                                                    union bpf_attr __user *uattr)
815 {
816         return -ENOTSUPP;
817 }
818 #endif /* CONFIG_BPF_SYSCALL */
819 
820 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
821                                                  enum bpf_prog_type type)
822 {
823         return bpf_prog_get_type_dev(ufd, type, false);
824 }
825 
826 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
827 
828 int bpf_prog_offload_compile(struct bpf_prog *prog);
829 void bpf_prog_offload_destroy(struct bpf_prog *prog);
830 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
831                                struct bpf_prog *prog);
832 
833 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
834 
835 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
836 int bpf_map_offload_update_elem(struct bpf_map *map,
837                                 void *key, void *value, u64 flags);
838 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
839 int bpf_map_offload_get_next_key(struct bpf_map *map,
840                                  void *key, void *next_key);
841 
842 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
843 
844 struct bpf_offload_dev *
845 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
846 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
847 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
848 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
849                                     struct net_device *netdev);
850 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
851                                        struct net_device *netdev);
852 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
853 
854 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
855 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
856 
857 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
858 {
859         return aux->offload_requested;
860 }
861 
862 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
863 {
864         return unlikely(map->ops == &bpf_map_offload_ops);
865 }
866 
867 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
868 void bpf_map_offload_map_free(struct bpf_map *map);
869 #else
870 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
871                                         union bpf_attr *attr)
872 {
873         return -EOPNOTSUPP;
874 }
875 
876 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
877 {
878         return false;
879 }
880 
881 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
882 {
883         return false;
884 }
885 
886 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
887 {
888         return ERR_PTR(-EOPNOTSUPP);
889 }
890 
891 static inline void bpf_map_offload_map_free(struct bpf_map *map)
892 {
893 }
894 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
895 
896 #if defined(CONFIG_BPF_STREAM_PARSER)
897 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which);
898 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
899 #else
900 static inline int sock_map_prog_update(struct bpf_map *map,
901                                        struct bpf_prog *prog, u32 which)
902 {
903         return -EOPNOTSUPP;
904 }
905 
906 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
907                                        struct bpf_prog *prog)
908 {
909         return -EINVAL;
910 }
911 #endif
912 
913 #if defined(CONFIG_XDP_SOCKETS)
914 struct xdp_sock;
915 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key);
916 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
917                        struct xdp_sock *xs);
918 void __xsk_map_flush(struct bpf_map *map);
919 #else
920 struct xdp_sock;
921 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
922                                                      u32 key)
923 {
924         return NULL;
925 }
926 
927 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
928                                      struct xdp_sock *xs)
929 {
930         return -EOPNOTSUPP;
931 }
932 
933 static inline void __xsk_map_flush(struct bpf_map *map)
934 {
935 }
936 #endif
937 
938 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
939 void bpf_sk_reuseport_detach(struct sock *sk);
940 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
941                                        void *value);
942 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
943                                        void *value, u64 map_flags);
944 #else
945 static inline void bpf_sk_reuseport_detach(struct sock *sk)
946 {
947 }
948 
949 #ifdef CONFIG_BPF_SYSCALL
950 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
951                                                      void *key, void *value)
952 {
953         return -EOPNOTSUPP;
954 }
955 
956 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
957                                                      void *key, void *value,
958                                                      u64 map_flags)
959 {
960         return -EOPNOTSUPP;
961 }
962 #endif /* CONFIG_BPF_SYSCALL */
963 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
964 
965 /* verifier prototypes for helper functions called from eBPF programs */
966 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
967 extern const struct bpf_func_proto bpf_map_update_elem_proto;
968 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
969 extern const struct bpf_func_proto bpf_map_push_elem_proto;
970 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
971 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
972 
973 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
974 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
975 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
976 extern const struct bpf_func_proto bpf_tail_call_proto;
977 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
978 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
979 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
980 extern const struct bpf_func_proto bpf_get_current_comm_proto;
981 extern const struct bpf_func_proto bpf_get_stackid_proto;
982 extern const struct bpf_func_proto bpf_get_stack_proto;
983 extern const struct bpf_func_proto bpf_sock_map_update_proto;
984 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
985 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
986 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
987 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
988 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
989 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
990 extern const struct bpf_func_proto bpf_spin_lock_proto;
991 extern const struct bpf_func_proto bpf_spin_unlock_proto;
992 extern const struct bpf_func_proto bpf_get_local_storage_proto;
993 extern const struct bpf_func_proto bpf_strtol_proto;
994 extern const struct bpf_func_proto bpf_strtoul_proto;
995 
996 /* Shared helpers among cBPF and eBPF. */
997 void bpf_user_rnd_init_once(void);
998 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
999 
1000 #if defined(CONFIG_NET)
1001 bool bpf_sock_common_is_valid_access(int off, int size,
1002                                      enum bpf_access_type type,
1003                                      struct bpf_insn_access_aux *info);
1004 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1005                               struct bpf_insn_access_aux *info);
1006 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1007                                 const struct bpf_insn *si,
1008                                 struct bpf_insn *insn_buf,
1009                                 struct bpf_prog *prog,
1010                                 u32 *target_size);
1011 #else
1012 static inline bool bpf_sock_common_is_valid_access(int off, int size,
1013                                                    enum bpf_access_type type,
1014                                                    struct bpf_insn_access_aux *info)
1015 {
1016         return false;
1017 }
1018 static inline bool bpf_sock_is_valid_access(int off, int size,
1019                                             enum bpf_access_type type,
1020                                             struct bpf_insn_access_aux *info)
1021 {
1022         return false;
1023 }
1024 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1025                                               const struct bpf_insn *si,
1026                                               struct bpf_insn *insn_buf,
1027                                               struct bpf_prog *prog,
1028                                               u32 *target_size)
1029 {
1030         return 0;
1031 }
1032 #endif
1033 
1034 #ifdef CONFIG_INET
1035 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1036                                   struct bpf_insn_access_aux *info);
1037 
1038 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1039                                     const struct bpf_insn *si,
1040                                     struct bpf_insn *insn_buf,
1041                                     struct bpf_prog *prog,
1042                                     u32 *target_size);
1043 #else
1044 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
1045                                                 enum bpf_access_type type,
1046                                                 struct bpf_insn_access_aux *info)
1047 {
1048         return false;
1049 }
1050 
1051 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1052                                                   const struct bpf_insn *si,
1053                                                   struct bpf_insn *insn_buf,
1054                                                   struct bpf_prog *prog,
1055                                                   u32 *target_size)
1056 {
1057         return 0;
1058 }
1059 #endif /* CONFIG_INET */
1060 
1061 #endif /* _LINUX_BPF_H */
1062 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp