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

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
  3  */
  4 #ifndef _LINUX_BPF_H
  5 #define _LINUX_BPF_H 1
  6 
  7 #include <uapi/linux/bpf.h>
  8 
  9 #include <linux/workqueue.h>
 10 #include <linux/file.h>
 11 #include <linux/percpu.h>
 12 #include <linux/err.h>
 13 #include <linux/rbtree_latch.h>
 14 #include <linux/numa.h>
 15 #include <linux/mm_types.h>
 16 #include <linux/wait.h>
 17 #include <linux/u64_stats_sync.h>
 18 #include <linux/refcount.h>
 19 #include <linux/mutex.h>
 20 #include <linux/module.h>
 21 #include <linux/kallsyms.h>
 22 #include <linux/capability.h>
 23 
 24 struct bpf_verifier_env;
 25 struct bpf_verifier_log;
 26 struct perf_event;
 27 struct bpf_prog;
 28 struct bpf_prog_aux;
 29 struct bpf_map;
 30 struct sock;
 31 struct seq_file;
 32 struct btf;
 33 struct btf_type;
 34 struct exception_table_entry;
 35 struct seq_operations;
 36 struct bpf_iter_aux_info;
 37 
 38 extern struct idr btf_idr;
 39 extern spinlock_t btf_idr_lock;
 40 
 41 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
 42                                         struct bpf_iter_aux_info *aux);
 43 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
 44 struct bpf_iter_seq_info {
 45         const struct seq_operations *seq_ops;
 46         bpf_iter_init_seq_priv_t init_seq_private;
 47         bpf_iter_fini_seq_priv_t fini_seq_private;
 48         u32 seq_priv_size;
 49 };
 50 
 51 /* map is generic key/value storage optionally accesible by eBPF programs */
 52 struct bpf_map_ops {
 53         /* funcs callable from userspace (via syscall) */
 54         int (*map_alloc_check)(union bpf_attr *attr);
 55         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
 56         void (*map_release)(struct bpf_map *map, struct file *map_file);
 57         void (*map_free)(struct bpf_map *map);
 58         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
 59         void (*map_release_uref)(struct bpf_map *map);
 60         void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
 61         int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
 62                                 union bpf_attr __user *uattr);
 63         int (*map_lookup_and_delete_batch)(struct bpf_map *map,
 64                                            const union bpf_attr *attr,
 65                                            union bpf_attr __user *uattr);
 66         int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
 67                                 union bpf_attr __user *uattr);
 68         int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
 69                                 union bpf_attr __user *uattr);
 70 
 71         /* funcs callable from userspace and from eBPF programs */
 72         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
 73         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
 74         int (*map_delete_elem)(struct bpf_map *map, void *key);
 75         int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
 76         int (*map_pop_elem)(struct bpf_map *map, void *value);
 77         int (*map_peek_elem)(struct bpf_map *map, void *value);
 78 
 79         /* funcs called by prog_array and perf_event_array map */
 80         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
 81                                 int fd);
 82         void (*map_fd_put_ptr)(void *ptr);
 83         u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
 84         u32 (*map_fd_sys_lookup_elem)(void *ptr);
 85         void (*map_seq_show_elem)(struct bpf_map *map, void *key,
 86                                   struct seq_file *m);
 87         int (*map_check_btf)(const struct bpf_map *map,
 88                              const struct btf *btf,
 89                              const struct btf_type *key_type,
 90                              const struct btf_type *value_type);
 91 
 92         /* Prog poke tracking helpers. */
 93         int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
 94         void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
 95         void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
 96                              struct bpf_prog *new);
 97 
 98         /* Direct value access helpers. */
 99         int (*map_direct_value_addr)(const struct bpf_map *map,
100                                      u64 *imm, u32 off);
101         int (*map_direct_value_meta)(const struct bpf_map *map,
102                                      u64 imm, u32 *off);
103         int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
104         __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
105                              struct poll_table_struct *pts);
106 
107         /* BTF name and id of struct allocated by map_alloc */
108         const char * const map_btf_name;
109         int *map_btf_id;
110 
111         /* bpf_iter info used to open a seq_file */
112         const struct bpf_iter_seq_info *iter_seq_info;
113 };
114 
115 struct bpf_map_memory {
116         u32 pages;
117         struct user_struct *user;
118 };
119 
120 struct bpf_map {
121         /* The first two cachelines with read-mostly members of which some
122          * are also accessed in fast-path (e.g. ops, max_entries).
123          */
124         const struct bpf_map_ops *ops ____cacheline_aligned;
125         struct bpf_map *inner_map_meta;
126 #ifdef CONFIG_SECURITY
127         void *security;
128 #endif
129         enum bpf_map_type map_type;
130         u32 key_size;
131         u32 value_size;
132         u32 max_entries;
133         u32 map_flags;
134         int spin_lock_off; /* >=0 valid offset, <0 error */
135         u32 id;
136         int numa_node;
137         u32 btf_key_type_id;
138         u32 btf_value_type_id;
139         struct btf *btf;
140         struct bpf_map_memory memory;
141         char name[BPF_OBJ_NAME_LEN];
142         u32 btf_vmlinux_value_type_id;
143         bool bypass_spec_v1;
144         bool frozen; /* write-once; write-protected by freeze_mutex */
145         /* 22 bytes hole */
146 
147         /* The 3rd and 4th cacheline with misc members to avoid false sharing
148          * particularly with refcounting.
149          */
150         atomic64_t refcnt ____cacheline_aligned;
151         atomic64_t usercnt;
152         struct work_struct work;
153         struct mutex freeze_mutex;
154         u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
155 };
156 
157 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
158 {
159         return map->spin_lock_off >= 0;
160 }
161 
162 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
163 {
164         if (likely(!map_value_has_spin_lock(map)))
165                 return;
166         *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
167                 (struct bpf_spin_lock){};
168 }
169 
170 /* copy everything but bpf_spin_lock */
171 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
172 {
173         if (unlikely(map_value_has_spin_lock(map))) {
174                 u32 off = map->spin_lock_off;
175 
176                 memcpy(dst, src, off);
177                 memcpy(dst + off + sizeof(struct bpf_spin_lock),
178                        src + off + sizeof(struct bpf_spin_lock),
179                        map->value_size - off - sizeof(struct bpf_spin_lock));
180         } else {
181                 memcpy(dst, src, map->value_size);
182         }
183 }
184 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
185                            bool lock_src);
186 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
187 
188 struct bpf_offload_dev;
189 struct bpf_offloaded_map;
190 
191 struct bpf_map_dev_ops {
192         int (*map_get_next_key)(struct bpf_offloaded_map *map,
193                                 void *key, void *next_key);
194         int (*map_lookup_elem)(struct bpf_offloaded_map *map,
195                                void *key, void *value);
196         int (*map_update_elem)(struct bpf_offloaded_map *map,
197                                void *key, void *value, u64 flags);
198         int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
199 };
200 
201 struct bpf_offloaded_map {
202         struct bpf_map map;
203         struct net_device *netdev;
204         const struct bpf_map_dev_ops *dev_ops;
205         void *dev_priv;
206         struct list_head offloads;
207 };
208 
209 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
210 {
211         return container_of(map, struct bpf_offloaded_map, map);
212 }
213 
214 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
215 {
216         return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
217 }
218 
219 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
220 {
221         return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
222                 map->ops->map_seq_show_elem;
223 }
224 
225 int map_check_no_btf(const struct bpf_map *map,
226                      const struct btf *btf,
227                      const struct btf_type *key_type,
228                      const struct btf_type *value_type);
229 
230 extern const struct bpf_map_ops bpf_map_offload_ops;
231 
232 /* function argument constraints */
233 enum bpf_arg_type {
234         ARG_DONTCARE = 0,       /* unused argument in helper function */
235 
236         /* the following constraints used to prototype
237          * bpf_map_lookup/update/delete_elem() functions
238          */
239         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
240         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
241         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
242         ARG_PTR_TO_UNINIT_MAP_VALUE,    /* pointer to valid memory used to store a map value */
243         ARG_PTR_TO_MAP_VALUE_OR_NULL,   /* pointer to stack used as map value or NULL */
244 
245         /* the following constraints used to prototype bpf_memcmp() and other
246          * functions that access data on eBPF program stack
247          */
248         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
249         ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
250         ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
251                                  * helper function must fill all bytes or clear
252                                  * them in error case.
253                                  */
254 
255         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
256         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
257 
258         ARG_PTR_TO_CTX,         /* pointer to context */
259         ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
260         ARG_ANYTHING,           /* any (initialized) argument is ok */
261         ARG_PTR_TO_SPIN_LOCK,   /* pointer to bpf_spin_lock */
262         ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
263         ARG_PTR_TO_INT,         /* pointer to int */
264         ARG_PTR_TO_LONG,        /* pointer to long */
265         ARG_PTR_TO_SOCKET,      /* pointer to bpf_sock (fullsock) */
266         ARG_PTR_TO_SOCKET_OR_NULL,      /* pointer to bpf_sock (fullsock) or NULL */
267         ARG_PTR_TO_BTF_ID,      /* pointer to in-kernel struct */
268         ARG_PTR_TO_ALLOC_MEM,   /* pointer to dynamically allocated memory */
269         ARG_PTR_TO_ALLOC_MEM_OR_NULL,   /* pointer to dynamically allocated memory or NULL */
270         ARG_CONST_ALLOC_SIZE_OR_ZERO,   /* number of allocated bytes requested */
271 };
272 
273 /* type of values returned from helper functions */
274 enum bpf_return_type {
275         RET_INTEGER,                    /* function returns integer */
276         RET_VOID,                       /* function doesn't return anything */
277         RET_PTR_TO_MAP_VALUE,           /* returns a pointer to map elem value */
278         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
279         RET_PTR_TO_SOCKET_OR_NULL,      /* returns a pointer to a socket or NULL */
280         RET_PTR_TO_TCP_SOCK_OR_NULL,    /* returns a pointer to a tcp_sock or NULL */
281         RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
282         RET_PTR_TO_ALLOC_MEM_OR_NULL,   /* returns a pointer to dynamically allocated memory or NULL */
283         RET_PTR_TO_BTF_ID_OR_NULL,      /* returns a pointer to a btf_id or NULL */
284 };
285 
286 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
287  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
288  * instructions after verifying
289  */
290 struct bpf_func_proto {
291         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
292         bool gpl_only;
293         bool pkt_access;
294         enum bpf_return_type ret_type;
295         union {
296                 struct {
297                         enum bpf_arg_type arg1_type;
298                         enum bpf_arg_type arg2_type;
299                         enum bpf_arg_type arg3_type;
300                         enum bpf_arg_type arg4_type;
301                         enum bpf_arg_type arg5_type;
302                 };
303                 enum bpf_arg_type arg_type[5];
304         };
305         int *btf_id; /* BTF ids of arguments */
306         bool (*check_btf_id)(u32 btf_id, u32 arg); /* if the argument btf_id is
307                                                     * valid. Often used if more
308                                                     * than one btf id is permitted
309                                                     * for this argument.
310                                                     */
311         int *ret_btf_id; /* return value btf_id */
312 };
313 
314 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
315  * the first argument to eBPF programs.
316  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
317  */
318 struct bpf_context;
319 
320 enum bpf_access_type {
321         BPF_READ = 1,
322         BPF_WRITE = 2
323 };
324 
325 /* types of values stored in eBPF registers */
326 /* Pointer types represent:
327  * pointer
328  * pointer + imm
329  * pointer + (u16) var
330  * pointer + (u16) var + imm
331  * if (range > 0) then [ptr, ptr + range - off) is safe to access
332  * if (id > 0) means that some 'var' was added
333  * if (off > 0) means that 'imm' was added
334  */
335 enum bpf_reg_type {
336         NOT_INIT = 0,            /* nothing was written into register */
337         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
338         PTR_TO_CTX,              /* reg points to bpf_context */
339         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
340         PTR_TO_MAP_VALUE,        /* reg points to map element value */
341         PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
342         PTR_TO_STACK,            /* reg == frame_pointer + offset */
343         PTR_TO_PACKET_META,      /* skb->data - meta_len */
344         PTR_TO_PACKET,           /* reg points to skb->data */
345         PTR_TO_PACKET_END,       /* skb->data + headlen */
346         PTR_TO_FLOW_KEYS,        /* reg points to bpf_flow_keys */
347         PTR_TO_SOCKET,           /* reg points to struct bpf_sock */
348         PTR_TO_SOCKET_OR_NULL,   /* reg points to struct bpf_sock or NULL */
349         PTR_TO_SOCK_COMMON,      /* reg points to sock_common */
350         PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
351         PTR_TO_TCP_SOCK,         /* reg points to struct tcp_sock */
352         PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
353         PTR_TO_TP_BUFFER,        /* reg points to a writable raw tp's buffer */
354         PTR_TO_XDP_SOCK,         /* reg points to struct xdp_sock */
355         PTR_TO_BTF_ID,           /* reg points to kernel struct */
356         PTR_TO_BTF_ID_OR_NULL,   /* reg points to kernel struct or NULL */
357         PTR_TO_MEM,              /* reg points to valid memory region */
358         PTR_TO_MEM_OR_NULL,      /* reg points to valid memory region or NULL */
359         PTR_TO_RDONLY_BUF,       /* reg points to a readonly buffer */
360         PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */
361         PTR_TO_RDWR_BUF,         /* reg points to a read/write buffer */
362         PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */
363 };
364 
365 /* The information passed from prog-specific *_is_valid_access
366  * back to the verifier.
367  */
368 struct bpf_insn_access_aux {
369         enum bpf_reg_type reg_type;
370         union {
371                 int ctx_field_size;
372                 u32 btf_id;
373         };
374         struct bpf_verifier_log *log; /* for verbose logs */
375 };
376 
377 static inline void
378 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
379 {
380         aux->ctx_field_size = size;
381 }
382 
383 struct bpf_prog_ops {
384         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
385                         union bpf_attr __user *uattr);
386 };
387 
388 struct bpf_verifier_ops {
389         /* return eBPF function prototype for verification */
390         const struct bpf_func_proto *
391         (*get_func_proto)(enum bpf_func_id func_id,
392                           const struct bpf_prog *prog);
393 
394         /* return true if 'size' wide access at offset 'off' within bpf_context
395          * with 'type' (read or write) is allowed
396          */
397         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
398                                 const struct bpf_prog *prog,
399                                 struct bpf_insn_access_aux *info);
400         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
401                             const struct bpf_prog *prog);
402         int (*gen_ld_abs)(const struct bpf_insn *orig,
403                           struct bpf_insn *insn_buf);
404         u32 (*convert_ctx_access)(enum bpf_access_type type,
405                                   const struct bpf_insn *src,
406                                   struct bpf_insn *dst,
407                                   struct bpf_prog *prog, u32 *target_size);
408         int (*btf_struct_access)(struct bpf_verifier_log *log,
409                                  const struct btf_type *t, int off, int size,
410                                  enum bpf_access_type atype,
411                                  u32 *next_btf_id);
412 };
413 
414 struct bpf_prog_offload_ops {
415         /* verifier basic callbacks */
416         int (*insn_hook)(struct bpf_verifier_env *env,
417                          int insn_idx, int prev_insn_idx);
418         int (*finalize)(struct bpf_verifier_env *env);
419         /* verifier optimization callbacks (called after .finalize) */
420         int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
421                             struct bpf_insn *insn);
422         int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
423         /* program management callbacks */
424         int (*prepare)(struct bpf_prog *prog);
425         int (*translate)(struct bpf_prog *prog);
426         void (*destroy)(struct bpf_prog *prog);
427 };
428 
429 struct bpf_prog_offload {
430         struct bpf_prog         *prog;
431         struct net_device       *netdev;
432         struct bpf_offload_dev  *offdev;
433         void                    *dev_priv;
434         struct list_head        offloads;
435         bool                    dev_state;
436         bool                    opt_failed;
437         void                    *jited_image;
438         u32                     jited_len;
439 };
440 
441 enum bpf_cgroup_storage_type {
442         BPF_CGROUP_STORAGE_SHARED,
443         BPF_CGROUP_STORAGE_PERCPU,
444         __BPF_CGROUP_STORAGE_MAX
445 };
446 
447 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
448 
449 /* The longest tracepoint has 12 args.
450  * See include/trace/bpf_probe.h
451  */
452 #define MAX_BPF_FUNC_ARGS 12
453 
454 struct bpf_prog_stats {
455         u64 cnt;
456         u64 nsecs;
457         struct u64_stats_sync syncp;
458 } __aligned(2 * sizeof(u64));
459 
460 struct btf_func_model {
461         u8 ret_size;
462         u8 nr_args;
463         u8 arg_size[MAX_BPF_FUNC_ARGS];
464 };
465 
466 /* Restore arguments before returning from trampoline to let original function
467  * continue executing. This flag is used for fentry progs when there are no
468  * fexit progs.
469  */
470 #define BPF_TRAMP_F_RESTORE_REGS        BIT(0)
471 /* Call original function after fentry progs, but before fexit progs.
472  * Makes sense for fentry/fexit, normal calls and indirect calls.
473  */
474 #define BPF_TRAMP_F_CALL_ORIG           BIT(1)
475 /* Skip current frame and return to parent.  Makes sense for fentry/fexit
476  * programs only. Should not be used with normal calls and indirect calls.
477  */
478 #define BPF_TRAMP_F_SKIP_FRAME          BIT(2)
479 
480 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
481  * bytes on x86.  Pick a number to fit into BPF_IMAGE_SIZE / 2
482  */
483 #define BPF_MAX_TRAMP_PROGS 40
484 
485 struct bpf_tramp_progs {
486         struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
487         int nr_progs;
488 };
489 
490 /* Different use cases for BPF trampoline:
491  * 1. replace nop at the function entry (kprobe equivalent)
492  *    flags = BPF_TRAMP_F_RESTORE_REGS
493  *    fentry = a set of programs to run before returning from trampoline
494  *
495  * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
496  *    flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
497  *    orig_call = fentry_ip + MCOUNT_INSN_SIZE
498  *    fentry = a set of program to run before calling original function
499  *    fexit = a set of program to run after original function
500  *
501  * 3. replace direct call instruction anywhere in the function body
502  *    or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
503  *    With flags = 0
504  *      fentry = a set of programs to run before returning from trampoline
505  *    With flags = BPF_TRAMP_F_CALL_ORIG
506  *      orig_call = original callback addr or direct function addr
507  *      fentry = a set of program to run before calling original function
508  *      fexit = a set of program to run after original function
509  */
510 int arch_prepare_bpf_trampoline(void *image, void *image_end,
511                                 const struct btf_func_model *m, u32 flags,
512                                 struct bpf_tramp_progs *tprogs,
513                                 void *orig_call);
514 /* these two functions are called from generated trampoline */
515 u64 notrace __bpf_prog_enter(void);
516 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
517 
518 struct bpf_ksym {
519         unsigned long            start;
520         unsigned long            end;
521         char                     name[KSYM_NAME_LEN];
522         struct list_head         lnode;
523         struct latch_tree_node   tnode;
524         bool                     prog;
525 };
526 
527 enum bpf_tramp_prog_type {
528         BPF_TRAMP_FENTRY,
529         BPF_TRAMP_FEXIT,
530         BPF_TRAMP_MODIFY_RETURN,
531         BPF_TRAMP_MAX,
532         BPF_TRAMP_REPLACE, /* more than MAX */
533 };
534 
535 struct bpf_trampoline {
536         /* hlist for trampoline_table */
537         struct hlist_node hlist;
538         /* serializes access to fields of this trampoline */
539         struct mutex mutex;
540         refcount_t refcnt;
541         u64 key;
542         struct {
543                 struct btf_func_model model;
544                 void *addr;
545                 bool ftrace_managed;
546         } func;
547         /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
548          * program by replacing one of its functions. func.addr is the address
549          * of the function it replaced.
550          */
551         struct bpf_prog *extension_prog;
552         /* list of BPF programs using this trampoline */
553         struct hlist_head progs_hlist[BPF_TRAMP_MAX];
554         /* Number of attached programs. A counter per kind. */
555         int progs_cnt[BPF_TRAMP_MAX];
556         /* Executable image of trampoline */
557         void *image;
558         u64 selector;
559         struct bpf_ksym ksym;
560 };
561 
562 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
563 
564 struct bpf_dispatcher_prog {
565         struct bpf_prog *prog;
566         refcount_t users;
567 };
568 
569 struct bpf_dispatcher {
570         /* dispatcher mutex */
571         struct mutex mutex;
572         void *func;
573         struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
574         int num_progs;
575         void *image;
576         u32 image_off;
577         struct bpf_ksym ksym;
578 };
579 
580 static __always_inline unsigned int bpf_dispatcher_nop_func(
581         const void *ctx,
582         const struct bpf_insn *insnsi,
583         unsigned int (*bpf_func)(const void *,
584                                  const struct bpf_insn *))
585 {
586         return bpf_func(ctx, insnsi);
587 }
588 #ifdef CONFIG_BPF_JIT
589 struct bpf_trampoline *bpf_trampoline_lookup(u64 key);
590 int bpf_trampoline_link_prog(struct bpf_prog *prog);
591 int bpf_trampoline_unlink_prog(struct bpf_prog *prog);
592 void bpf_trampoline_put(struct bpf_trampoline *tr);
593 #define BPF_DISPATCHER_INIT(_name) {                            \
594         .mutex = __MUTEX_INITIALIZER(_name.mutex),              \
595         .func = &_name##_func,                                  \
596         .progs = {},                                            \
597         .num_progs = 0,                                         \
598         .image = NULL,                                          \
599         .image_off = 0,                                         \
600         .ksym = {                                               \
601                 .name  = #_name,                                \
602                 .lnode = LIST_HEAD_INIT(_name.ksym.lnode),      \
603         },                                                      \
604 }
605 
606 #define DEFINE_BPF_DISPATCHER(name)                                     \
607         noinline unsigned int bpf_dispatcher_##name##_func(             \
608                 const void *ctx,                                        \
609                 const struct bpf_insn *insnsi,                          \
610                 unsigned int (*bpf_func)(const void *,                  \
611                                          const struct bpf_insn *))      \
612         {                                                               \
613                 return bpf_func(ctx, insnsi);                           \
614         }                                                               \
615         EXPORT_SYMBOL(bpf_dispatcher_##name##_func);                    \
616         struct bpf_dispatcher bpf_dispatcher_##name =                   \
617                 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
618 #define DECLARE_BPF_DISPATCHER(name)                                    \
619         unsigned int bpf_dispatcher_##name##_func(                      \
620                 const void *ctx,                                        \
621                 const struct bpf_insn *insnsi,                          \
622                 unsigned int (*bpf_func)(const void *,                  \
623                                          const struct bpf_insn *));     \
624         extern struct bpf_dispatcher bpf_dispatcher_##name;
625 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
626 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
627 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
628                                 struct bpf_prog *to);
629 /* Called only from JIT-enabled code, so there's no need for stubs. */
630 void *bpf_jit_alloc_exec_page(void);
631 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
632 void bpf_image_ksym_del(struct bpf_ksym *ksym);
633 void bpf_ksym_add(struct bpf_ksym *ksym);
634 void bpf_ksym_del(struct bpf_ksym *ksym);
635 #else
636 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
637 {
638         return NULL;
639 }
640 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog)
641 {
642         return -ENOTSUPP;
643 }
644 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
645 {
646         return -ENOTSUPP;
647 }
648 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
649 #define DEFINE_BPF_DISPATCHER(name)
650 #define DECLARE_BPF_DISPATCHER(name)
651 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
652 #define BPF_DISPATCHER_PTR(name) NULL
653 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
654                                               struct bpf_prog *from,
655                                               struct bpf_prog *to) {}
656 static inline bool is_bpf_image_address(unsigned long address)
657 {
658         return false;
659 }
660 #endif
661 
662 struct bpf_func_info_aux {
663         u16 linkage;
664         bool unreliable;
665 };
666 
667 enum bpf_jit_poke_reason {
668         BPF_POKE_REASON_TAIL_CALL,
669 };
670 
671 /* Descriptor of pokes pointing /into/ the JITed image. */
672 struct bpf_jit_poke_descriptor {
673         void *ip;
674         union {
675                 struct {
676                         struct bpf_map *map;
677                         u32 key;
678                 } tail_call;
679         };
680         bool ip_stable;
681         u8 adj_off;
682         u16 reason;
683 };
684 
685 /* reg_type info for ctx arguments */
686 struct bpf_ctx_arg_aux {
687         u32 offset;
688         enum bpf_reg_type reg_type;
689         u32 btf_id;
690 };
691 
692 struct bpf_prog_aux {
693         atomic64_t refcnt;
694         u32 used_map_cnt;
695         u32 max_ctx_offset;
696         u32 max_pkt_offset;
697         u32 max_tp_access;
698         u32 stack_depth;
699         u32 id;
700         u32 func_cnt; /* used by non-func prog as the number of func progs */
701         u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
702         u32 attach_btf_id; /* in-kernel BTF type id to attach to */
703         u32 ctx_arg_info_size;
704         u32 max_rdonly_access;
705         u32 max_rdwr_access;
706         const struct bpf_ctx_arg_aux *ctx_arg_info;
707         struct bpf_prog *linked_prog;
708         bool verifier_zext; /* Zero extensions has been inserted by verifier. */
709         bool offload_requested;
710         bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
711         bool func_proto_unreliable;
712         enum bpf_tramp_prog_type trampoline_prog_type;
713         struct bpf_trampoline *trampoline;
714         struct hlist_node tramp_hlist;
715         /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
716         const struct btf_type *attach_func_proto;
717         /* function name for valid attach_btf_id */
718         const char *attach_func_name;
719         struct bpf_prog **func;
720         void *jit_data; /* JIT specific data. arch dependent */
721         struct bpf_jit_poke_descriptor *poke_tab;
722         u32 size_poke_tab;
723         struct bpf_ksym ksym;
724         const struct bpf_prog_ops *ops;
725         struct bpf_map **used_maps;
726         struct bpf_prog *prog;
727         struct user_struct *user;
728         u64 load_time; /* ns since boottime */
729         struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
730         char name[BPF_OBJ_NAME_LEN];
731 #ifdef CONFIG_SECURITY
732         void *security;
733 #endif
734         struct bpf_prog_offload *offload;
735         struct btf *btf;
736         struct bpf_func_info *func_info;
737         struct bpf_func_info_aux *func_info_aux;
738         /* bpf_line_info loaded from userspace.  linfo->insn_off
739          * has the xlated insn offset.
740          * Both the main and sub prog share the same linfo.
741          * The subprog can access its first linfo by
742          * using the linfo_idx.
743          */
744         struct bpf_line_info *linfo;
745         /* jited_linfo is the jited addr of the linfo.  It has a
746          * one to one mapping to linfo:
747          * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
748          * Both the main and sub prog share the same jited_linfo.
749          * The subprog can access its first jited_linfo by
750          * using the linfo_idx.
751          */
752         void **jited_linfo;
753         u32 func_info_cnt;
754         u32 nr_linfo;
755         /* subprog can use linfo_idx to access its first linfo and
756          * jited_linfo.
757          * main prog always has linfo_idx == 0
758          */
759         u32 linfo_idx;
760         u32 num_exentries;
761         struct exception_table_entry *extable;
762         struct bpf_prog_stats __percpu *stats;
763         union {
764                 struct work_struct work;
765                 struct rcu_head rcu;
766         };
767 };
768 
769 struct bpf_array_aux {
770         /* 'Ownership' of prog array is claimed by the first program that
771          * is going to use this map or by the first program which FD is
772          * stored in the map to make sure that all callers and callees have
773          * the same prog type and JITed flag.
774          */
775         enum bpf_prog_type type;
776         bool jited;
777         /* Programs with direct jumps into programs part of this array. */
778         struct list_head poke_progs;
779         struct bpf_map *map;
780         struct mutex poke_mutex;
781         struct work_struct work;
782 };
783 
784 struct bpf_link {
785         atomic64_t refcnt;
786         u32 id;
787         enum bpf_link_type type;
788         const struct bpf_link_ops *ops;
789         struct bpf_prog *prog;
790         struct work_struct work;
791 };
792 
793 struct bpf_link_ops {
794         void (*release)(struct bpf_link *link);
795         void (*dealloc)(struct bpf_link *link);
796         int (*detach)(struct bpf_link *link);
797         int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
798                            struct bpf_prog *old_prog);
799         void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
800         int (*fill_link_info)(const struct bpf_link *link,
801                               struct bpf_link_info *info);
802 };
803 
804 struct bpf_link_primer {
805         struct bpf_link *link;
806         struct file *file;
807         int fd;
808         u32 id;
809 };
810 
811 struct bpf_struct_ops_value;
812 struct btf_type;
813 struct btf_member;
814 
815 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
816 struct bpf_struct_ops {
817         const struct bpf_verifier_ops *verifier_ops;
818         int (*init)(struct btf *btf);
819         int (*check_member)(const struct btf_type *t,
820                             const struct btf_member *member);
821         int (*init_member)(const struct btf_type *t,
822                            const struct btf_member *member,
823                            void *kdata, const void *udata);
824         int (*reg)(void *kdata);
825         void (*unreg)(void *kdata);
826         const struct btf_type *type;
827         const struct btf_type *value_type;
828         const char *name;
829         struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
830         u32 type_id;
831         u32 value_id;
832 };
833 
834 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
835 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
836 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
837 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
838 bool bpf_struct_ops_get(const void *kdata);
839 void bpf_struct_ops_put(const void *kdata);
840 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
841                                        void *value);
842 static inline bool bpf_try_module_get(const void *data, struct module *owner)
843 {
844         if (owner == BPF_MODULE_OWNER)
845                 return bpf_struct_ops_get(data);
846         else
847                 return try_module_get(owner);
848 }
849 static inline void bpf_module_put(const void *data, struct module *owner)
850 {
851         if (owner == BPF_MODULE_OWNER)
852                 bpf_struct_ops_put(data);
853         else
854                 module_put(owner);
855 }
856 #else
857 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
858 {
859         return NULL;
860 }
861 static inline void bpf_struct_ops_init(struct btf *btf,
862                                        struct bpf_verifier_log *log)
863 {
864 }
865 static inline bool bpf_try_module_get(const void *data, struct module *owner)
866 {
867         return try_module_get(owner);
868 }
869 static inline void bpf_module_put(const void *data, struct module *owner)
870 {
871         module_put(owner);
872 }
873 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
874                                                      void *key,
875                                                      void *value)
876 {
877         return -EINVAL;
878 }
879 #endif
880 
881 struct bpf_array {
882         struct bpf_map map;
883         u32 elem_size;
884         u32 index_mask;
885         struct bpf_array_aux *aux;
886         union {
887                 char value[0] __aligned(8);
888                 void *ptrs[0] __aligned(8);
889                 void __percpu *pptrs[0] __aligned(8);
890         };
891 };
892 
893 #define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
894 #define MAX_TAIL_CALL_CNT 32
895 
896 #define BPF_F_ACCESS_MASK       (BPF_F_RDONLY |         \
897                                  BPF_F_RDONLY_PROG |    \
898                                  BPF_F_WRONLY |         \
899                                  BPF_F_WRONLY_PROG)
900 
901 #define BPF_MAP_CAN_READ        BIT(0)
902 #define BPF_MAP_CAN_WRITE       BIT(1)
903 
904 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
905 {
906         u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
907 
908         /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
909          * not possible.
910          */
911         if (access_flags & BPF_F_RDONLY_PROG)
912                 return BPF_MAP_CAN_READ;
913         else if (access_flags & BPF_F_WRONLY_PROG)
914                 return BPF_MAP_CAN_WRITE;
915         else
916                 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
917 }
918 
919 static inline bool bpf_map_flags_access_ok(u32 access_flags)
920 {
921         return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
922                (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
923 }
924 
925 struct bpf_event_entry {
926         struct perf_event *event;
927         struct file *perf_file;
928         struct file *map_file;
929         struct rcu_head rcu;
930 };
931 
932 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
933 int bpf_prog_calc_tag(struct bpf_prog *fp);
934 const char *kernel_type_name(u32 btf_type_id);
935 
936 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
937 
938 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
939                                         unsigned long off, unsigned long len);
940 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
941                                         const struct bpf_insn *src,
942                                         struct bpf_insn *dst,
943                                         struct bpf_prog *prog,
944                                         u32 *target_size);
945 
946 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
947                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
948 
949 /* an array of programs to be executed under rcu_lock.
950  *
951  * Typical usage:
952  * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
953  *
954  * the structure returned by bpf_prog_array_alloc() should be populated
955  * with program pointers and the last pointer must be NULL.
956  * The user has to keep refcnt on the program and make sure the program
957  * is removed from the array before bpf_prog_put().
958  * The 'struct bpf_prog_array *' should only be replaced with xchg()
959  * since other cpus are walking the array of pointers in parallel.
960  */
961 struct bpf_prog_array_item {
962         struct bpf_prog *prog;
963         struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
964 };
965 
966 struct bpf_prog_array {
967         struct rcu_head rcu;
968         struct bpf_prog_array_item items[];
969 };
970 
971 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
972 void bpf_prog_array_free(struct bpf_prog_array *progs);
973 int bpf_prog_array_length(struct bpf_prog_array *progs);
974 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
975 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
976                                 __u32 __user *prog_ids, u32 cnt);
977 
978 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
979                                 struct bpf_prog *old_prog);
980 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
981 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
982                              struct bpf_prog *prog);
983 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
984                              u32 *prog_ids, u32 request_cnt,
985                              u32 *prog_cnt);
986 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
987                         struct bpf_prog *exclude_prog,
988                         struct bpf_prog *include_prog,
989                         struct bpf_prog_array **new_array);
990 
991 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
992         ({                                              \
993                 struct bpf_prog_array_item *_item;      \
994                 struct bpf_prog *_prog;                 \
995                 struct bpf_prog_array *_array;          \
996                 u32 _ret = 1;                           \
997                 migrate_disable();                      \
998                 rcu_read_lock();                        \
999                 _array = rcu_dereference(array);        \
1000                 if (unlikely(check_non_null && !_array))\
1001                         goto _out;                      \
1002                 _item = &_array->items[0];              \
1003                 while ((_prog = READ_ONCE(_item->prog))) {              \
1004                         bpf_cgroup_storage_set(_item->cgroup_storage);  \
1005                         _ret &= func(_prog, ctx);       \
1006                         _item++;                        \
1007                 }                                       \
1008 _out:                                                   \
1009                 rcu_read_unlock();                      \
1010                 migrate_enable();                       \
1011                 _ret;                                   \
1012          })
1013 
1014 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1015  * so BPF programs can request cwr for TCP packets.
1016  *
1017  * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1018  * packet. This macro changes the behavior so the low order bit
1019  * indicates whether the packet should be dropped (0) or not (1)
1020  * and the next bit is a congestion notification bit. This could be
1021  * used by TCP to call tcp_enter_cwr()
1022  *
1023  * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1024  *   0: drop packet
1025  *   1: keep packet
1026  *   2: drop packet and cn
1027  *   3: keep packet and cn
1028  *
1029  * This macro then converts it to one of the NET_XMIT or an error
1030  * code that is then interpreted as drop packet (and no cn):
1031  *   0: NET_XMIT_SUCCESS  skb should be transmitted
1032  *   1: NET_XMIT_DROP     skb should be dropped and cn
1033  *   2: NET_XMIT_CN       skb should be transmitted and cn
1034  *   3: -EPERM            skb should be dropped
1035  */
1036 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func)         \
1037         ({                                              \
1038                 struct bpf_prog_array_item *_item;      \
1039                 struct bpf_prog *_prog;                 \
1040                 struct bpf_prog_array *_array;          \
1041                 u32 ret;                                \
1042                 u32 _ret = 1;                           \
1043                 u32 _cn = 0;                            \
1044                 migrate_disable();                      \
1045                 rcu_read_lock();                        \
1046                 _array = rcu_dereference(array);        \
1047                 _item = &_array->items[0];              \
1048                 while ((_prog = READ_ONCE(_item->prog))) {              \
1049                         bpf_cgroup_storage_set(_item->cgroup_storage);  \
1050                         ret = func(_prog, ctx);         \
1051                         _ret &= (ret & 1);              \
1052                         _cn |= (ret & 2);               \
1053                         _item++;                        \
1054                 }                                       \
1055                 rcu_read_unlock();                      \
1056                 migrate_enable();                       \
1057                 if (_ret)                               \
1058                         _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS);  \
1059                 else                                    \
1060                         _ret = (_cn ? NET_XMIT_DROP : -EPERM);          \
1061                 _ret;                                   \
1062         })
1063 
1064 #define BPF_PROG_RUN_ARRAY(array, ctx, func)            \
1065         __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
1066 
1067 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)      \
1068         __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
1069 
1070 #ifdef CONFIG_BPF_SYSCALL
1071 DECLARE_PER_CPU(int, bpf_prog_active);
1072 extern struct mutex bpf_stats_enabled_mutex;
1073 
1074 /*
1075  * Block execution of BPF programs attached to instrumentation (perf,
1076  * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1077  * these events can happen inside a region which holds a map bucket lock
1078  * and can deadlock on it.
1079  *
1080  * Use the preemption safe inc/dec variants on RT because migrate disable
1081  * is preemptible on RT and preemption in the middle of the RMW operation
1082  * might lead to inconsistent state. Use the raw variants for non RT
1083  * kernels as migrate_disable() maps to preempt_disable() so the slightly
1084  * more expensive save operation can be avoided.
1085  */
1086 static inline void bpf_disable_instrumentation(void)
1087 {
1088         migrate_disable();
1089         if (IS_ENABLED(CONFIG_PREEMPT_RT))
1090                 this_cpu_inc(bpf_prog_active);
1091         else
1092                 __this_cpu_inc(bpf_prog_active);
1093 }
1094 
1095 static inline void bpf_enable_instrumentation(void)
1096 {
1097         if (IS_ENABLED(CONFIG_PREEMPT_RT))
1098                 this_cpu_dec(bpf_prog_active);
1099         else
1100                 __this_cpu_dec(bpf_prog_active);
1101         migrate_enable();
1102 }
1103 
1104 extern const struct file_operations bpf_map_fops;
1105 extern const struct file_operations bpf_prog_fops;
1106 extern const struct file_operations bpf_iter_fops;
1107 
1108 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1109         extern const struct bpf_prog_ops _name ## _prog_ops; \
1110         extern const struct bpf_verifier_ops _name ## _verifier_ops;
1111 #define BPF_MAP_TYPE(_id, _ops) \
1112         extern const struct bpf_map_ops _ops;
1113 #define BPF_LINK_TYPE(_id, _name)
1114 #include <linux/bpf_types.h>
1115 #undef BPF_PROG_TYPE
1116 #undef BPF_MAP_TYPE
1117 #undef BPF_LINK_TYPE
1118 
1119 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1120 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1121 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1122 
1123 struct bpf_prog *bpf_prog_get(u32 ufd);
1124 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1125                                        bool attach_drv);
1126 void bpf_prog_add(struct bpf_prog *prog, int i);
1127 void bpf_prog_sub(struct bpf_prog *prog, int i);
1128 void bpf_prog_inc(struct bpf_prog *prog);
1129 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1130 void bpf_prog_put(struct bpf_prog *prog);
1131 int __bpf_prog_charge(struct user_struct *user, u32 pages);
1132 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
1133 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1134                           struct bpf_map **used_maps, u32 len);
1135 
1136 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1137 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1138 
1139 struct bpf_map *bpf_map_get(u32 ufd);
1140 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1141 struct bpf_map *__bpf_map_get(struct fd f);
1142 void bpf_map_inc(struct bpf_map *map);
1143 void bpf_map_inc_with_uref(struct bpf_map *map);
1144 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1145 void bpf_map_put_with_uref(struct bpf_map *map);
1146 void bpf_map_put(struct bpf_map *map);
1147 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
1148 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
1149 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
1150 void bpf_map_charge_finish(struct bpf_map_memory *mem);
1151 void bpf_map_charge_move(struct bpf_map_memory *dst,
1152                          struct bpf_map_memory *src);
1153 void *bpf_map_area_alloc(u64 size, int numa_node);
1154 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1155 void bpf_map_area_free(void *base);
1156 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1157 int  generic_map_lookup_batch(struct bpf_map *map,
1158                               const union bpf_attr *attr,
1159                               union bpf_attr __user *uattr);
1160 int  generic_map_update_batch(struct bpf_map *map,
1161                               const union bpf_attr *attr,
1162                               union bpf_attr __user *uattr);
1163 int  generic_map_delete_batch(struct bpf_map *map,
1164                               const union bpf_attr *attr,
1165                               union bpf_attr __user *uattr);
1166 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1167 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1168 
1169 extern int sysctl_unprivileged_bpf_disabled;
1170 
1171 static inline bool bpf_allow_ptr_leaks(void)
1172 {
1173         return perfmon_capable();
1174 }
1175 
1176 static inline bool bpf_allow_ptr_to_map_access(void)
1177 {
1178         return perfmon_capable();
1179 }
1180 
1181 static inline bool bpf_bypass_spec_v1(void)
1182 {
1183         return perfmon_capable();
1184 }
1185 
1186 static inline bool bpf_bypass_spec_v4(void)
1187 {
1188         return perfmon_capable();
1189 }
1190 
1191 int bpf_map_new_fd(struct bpf_map *map, int flags);
1192 int bpf_prog_new_fd(struct bpf_prog *prog);
1193 
1194 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1195                    const struct bpf_link_ops *ops, struct bpf_prog *prog);
1196 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1197 int bpf_link_settle(struct bpf_link_primer *primer);
1198 void bpf_link_cleanup(struct bpf_link_primer *primer);
1199 void bpf_link_inc(struct bpf_link *link);
1200 void bpf_link_put(struct bpf_link *link);
1201 int bpf_link_new_fd(struct bpf_link *link);
1202 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1203 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1204 
1205 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1206 int bpf_obj_get_user(const char __user *pathname, int flags);
1207 
1208 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1209 #define DEFINE_BPF_ITER_FUNC(target, args...)                   \
1210         extern int bpf_iter_ ## target(args);                   \
1211         int __init bpf_iter_ ## target(args) { return 0; }
1212 
1213 struct bpf_iter_aux_info {
1214         struct bpf_map *map;
1215 };
1216 
1217 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1218                                         union bpf_iter_link_info *linfo,
1219                                         struct bpf_iter_aux_info *aux);
1220 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1221 
1222 #define BPF_ITER_CTX_ARG_MAX 2
1223 struct bpf_iter_reg {
1224         const char *target;
1225         bpf_iter_attach_target_t attach_target;
1226         bpf_iter_detach_target_t detach_target;
1227         u32 ctx_arg_info_size;
1228         struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1229         const struct bpf_iter_seq_info *seq_info;
1230 };
1231 
1232 struct bpf_iter_meta {
1233         __bpf_md_ptr(struct seq_file *, seq);
1234         u64 session_id;
1235         u64 seq_num;
1236 };
1237 
1238 struct bpf_iter__bpf_map_elem {
1239         __bpf_md_ptr(struct bpf_iter_meta *, meta);
1240         __bpf_md_ptr(struct bpf_map *, map);
1241         __bpf_md_ptr(void *, key);
1242         __bpf_md_ptr(void *, value);
1243 };
1244 
1245 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1246 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1247 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1248 int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
1249 int bpf_iter_new_fd(struct bpf_link *link);
1250 bool bpf_link_is_iter(struct bpf_link *link);
1251 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1252 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1253 
1254 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1255 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1256 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1257                            u64 flags);
1258 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1259                             u64 flags);
1260 
1261 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1262 
1263 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1264                                  void *key, void *value, u64 map_flags);
1265 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1266 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1267                                 void *key, void *value, u64 map_flags);
1268 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1269 
1270 int bpf_get_file_flag(int flags);
1271 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
1272                              size_t actual_size);
1273 
1274 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1275  * forced to use 'long' read/writes to try to atomically copy long counters.
1276  * Best-effort only.  No barriers here, since it _will_ race with concurrent
1277  * updates from BPF programs. Called from bpf syscall and mostly used with
1278  * size 8 or 16 bytes, so ask compiler to inline it.
1279  */
1280 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1281 {
1282         const long *lsrc = src;
1283         long *ldst = dst;
1284 
1285         size /= sizeof(long);
1286         while (size--)
1287                 *ldst++ = *lsrc++;
1288 }
1289 
1290 /* verify correctness of eBPF program */
1291 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
1292               union bpf_attr __user *uattr);
1293 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1294 
1295 /* Map specifics */
1296 struct xdp_buff;
1297 struct sk_buff;
1298 
1299 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
1300 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
1301 void __dev_flush(void);
1302 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1303                     struct net_device *dev_rx);
1304 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1305                     struct net_device *dev_rx);
1306 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1307                              struct bpf_prog *xdp_prog);
1308 bool dev_map_can_have_prog(struct bpf_map *map);
1309 
1310 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
1311 void __cpu_map_flush(void);
1312 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1313                     struct net_device *dev_rx);
1314 bool cpu_map_prog_allowed(struct bpf_map *map);
1315 
1316 /* Return map's numa specified by userspace */
1317 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1318 {
1319         return (attr->map_flags & BPF_F_NUMA_NODE) ?
1320                 attr->numa_node : NUMA_NO_NODE;
1321 }
1322 
1323 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1324 int array_map_alloc_check(union bpf_attr *attr);
1325 
1326 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1327                           union bpf_attr __user *uattr);
1328 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1329                           union bpf_attr __user *uattr);
1330 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1331                               const union bpf_attr *kattr,
1332                               union bpf_attr __user *uattr);
1333 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1334                                      const union bpf_attr *kattr,
1335                                      union bpf_attr __user *uattr);
1336 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1337                     const struct bpf_prog *prog,
1338                     struct bpf_insn_access_aux *info);
1339 int btf_struct_access(struct bpf_verifier_log *log,
1340                       const struct btf_type *t, int off, int size,
1341                       enum bpf_access_type atype,
1342                       u32 *next_btf_id);
1343 int btf_resolve_helper_id(struct bpf_verifier_log *log,
1344                           const struct bpf_func_proto *fn, int);
1345 
1346 int btf_distill_func_proto(struct bpf_verifier_log *log,
1347                            struct btf *btf,
1348                            const struct btf_type *func_proto,
1349                            const char *func_name,
1350                            struct btf_func_model *m);
1351 
1352 struct bpf_reg_state;
1353 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
1354                              struct bpf_reg_state *regs);
1355 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1356                           struct bpf_reg_state *reg);
1357 int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
1358                          struct btf *btf, const struct btf_type *t);
1359 
1360 struct bpf_prog *bpf_prog_by_id(u32 id);
1361 
1362 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1363 #else /* !CONFIG_BPF_SYSCALL */
1364 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1365 {
1366         return ERR_PTR(-EOPNOTSUPP);
1367 }
1368 
1369 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1370                                                      enum bpf_prog_type type,
1371                                                      bool attach_drv)
1372 {
1373         return ERR_PTR(-EOPNOTSUPP);
1374 }
1375 
1376 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1377 {
1378 }
1379 
1380 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1381 {
1382 }
1383 
1384 static inline void bpf_prog_put(struct bpf_prog *prog)
1385 {
1386 }
1387 
1388 static inline void bpf_prog_inc(struct bpf_prog *prog)
1389 {
1390 }
1391 
1392 static inline struct bpf_prog *__must_check
1393 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1394 {
1395         return ERR_PTR(-EOPNOTSUPP);
1396 }
1397 
1398 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
1399 {
1400         return 0;
1401 }
1402 
1403 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1404 {
1405 }
1406 
1407 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1408                                  const struct bpf_link_ops *ops,
1409                                  struct bpf_prog *prog)
1410 {
1411 }
1412 
1413 static inline int bpf_link_prime(struct bpf_link *link,
1414                                  struct bpf_link_primer *primer)
1415 {
1416         return -EOPNOTSUPP;
1417 }
1418 
1419 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1420 {
1421         return -EOPNOTSUPP;
1422 }
1423 
1424 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1425 {
1426 }
1427 
1428 static inline void bpf_link_inc(struct bpf_link *link)
1429 {
1430 }
1431 
1432 static inline void bpf_link_put(struct bpf_link *link)
1433 {
1434 }
1435 
1436 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1437 {
1438         return -EOPNOTSUPP;
1439 }
1440 
1441 static inline struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
1442                                                        u32 key)
1443 {
1444         return NULL;
1445 }
1446 
1447 static inline struct net_device  *__dev_map_hash_lookup_elem(struct bpf_map *map,
1448                                                              u32 key)
1449 {
1450         return NULL;
1451 }
1452 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1453 {
1454         return false;
1455 }
1456 
1457 static inline void __dev_flush(void)
1458 {
1459 }
1460 
1461 struct xdp_buff;
1462 struct bpf_dtab_netdev;
1463 
1464 static inline
1465 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1466                     struct net_device *dev_rx)
1467 {
1468         return 0;
1469 }
1470 
1471 static inline
1472 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1473                     struct net_device *dev_rx)
1474 {
1475         return 0;
1476 }
1477 
1478 struct sk_buff;
1479 
1480 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1481                                            struct sk_buff *skb,
1482                                            struct bpf_prog *xdp_prog)
1483 {
1484         return 0;
1485 }
1486 
1487 static inline
1488 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
1489 {
1490         return NULL;
1491 }
1492 
1493 static inline void __cpu_map_flush(void)
1494 {
1495 }
1496 
1497 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1498                                   struct xdp_buff *xdp,
1499                                   struct net_device *dev_rx)
1500 {
1501         return 0;
1502 }
1503 
1504 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1505 {
1506         return false;
1507 }
1508 
1509 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1510                                 enum bpf_prog_type type)
1511 {
1512         return ERR_PTR(-EOPNOTSUPP);
1513 }
1514 
1515 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1516                                         const union bpf_attr *kattr,
1517                                         union bpf_attr __user *uattr)
1518 {
1519         return -ENOTSUPP;
1520 }
1521 
1522 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1523                                         const union bpf_attr *kattr,
1524                                         union bpf_attr __user *uattr)
1525 {
1526         return -ENOTSUPP;
1527 }
1528 
1529 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1530                                             const union bpf_attr *kattr,
1531                                             union bpf_attr __user *uattr)
1532 {
1533         return -ENOTSUPP;
1534 }
1535 
1536 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1537                                                    const union bpf_attr *kattr,
1538                                                    union bpf_attr __user *uattr)
1539 {
1540         return -ENOTSUPP;
1541 }
1542 
1543 static inline void bpf_map_put(struct bpf_map *map)
1544 {
1545 }
1546 
1547 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1548 {
1549         return ERR_PTR(-ENOTSUPP);
1550 }
1551 
1552 static inline const struct bpf_func_proto *
1553 bpf_base_func_proto(enum bpf_func_id func_id)
1554 {
1555         return NULL;
1556 }
1557 #endif /* CONFIG_BPF_SYSCALL */
1558 
1559 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1560                                                  enum bpf_prog_type type)
1561 {
1562         return bpf_prog_get_type_dev(ufd, type, false);
1563 }
1564 
1565 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1566 
1567 int bpf_prog_offload_compile(struct bpf_prog *prog);
1568 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1569 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1570                                struct bpf_prog *prog);
1571 
1572 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1573 
1574 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1575 int bpf_map_offload_update_elem(struct bpf_map *map,
1576                                 void *key, void *value, u64 flags);
1577 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1578 int bpf_map_offload_get_next_key(struct bpf_map *map,
1579                                  void *key, void *next_key);
1580 
1581 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1582 
1583 struct bpf_offload_dev *
1584 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1585 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1586 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1587 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1588                                     struct net_device *netdev);
1589 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1590                                        struct net_device *netdev);
1591 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
1592 
1593 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
1594 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
1595 
1596 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
1597 {
1598         return aux->offload_requested;
1599 }
1600 
1601 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1602 {
1603         return unlikely(map->ops == &bpf_map_offload_ops);
1604 }
1605 
1606 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
1607 void bpf_map_offload_map_free(struct bpf_map *map);
1608 #else
1609 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
1610                                         union bpf_attr *attr)
1611 {
1612         return -EOPNOTSUPP;
1613 }
1614 
1615 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
1616 {
1617         return false;
1618 }
1619 
1620 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1621 {
1622         return false;
1623 }
1624 
1625 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
1626 {
1627         return ERR_PTR(-EOPNOTSUPP);
1628 }
1629 
1630 static inline void bpf_map_offload_map_free(struct bpf_map *map)
1631 {
1632 }
1633 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
1634 
1635 #if defined(CONFIG_BPF_STREAM_PARSER)
1636 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog,
1637                          struct bpf_prog *old, u32 which);
1638 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
1639 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
1640 void sock_map_unhash(struct sock *sk);
1641 void sock_map_close(struct sock *sk, long timeout);
1642 #else
1643 static inline int sock_map_prog_update(struct bpf_map *map,
1644                                        struct bpf_prog *prog,
1645                                        struct bpf_prog *old, u32 which)
1646 {
1647         return -EOPNOTSUPP;
1648 }
1649 
1650 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
1651                                        struct bpf_prog *prog)
1652 {
1653         return -EINVAL;
1654 }
1655 
1656 static inline int sock_map_prog_detach(const union bpf_attr *attr,
1657                                        enum bpf_prog_type ptype)
1658 {
1659         return -EOPNOTSUPP;
1660 }
1661 #endif /* CONFIG_BPF_STREAM_PARSER */
1662 
1663 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
1664 void bpf_sk_reuseport_detach(struct sock *sk);
1665 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
1666                                        void *value);
1667 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
1668                                        void *value, u64 map_flags);
1669 #else
1670 static inline void bpf_sk_reuseport_detach(struct sock *sk)
1671 {
1672 }
1673 
1674 #ifdef CONFIG_BPF_SYSCALL
1675 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
1676                                                      void *key, void *value)
1677 {
1678         return -EOPNOTSUPP;
1679 }
1680 
1681 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
1682                                                      void *key, void *value,
1683                                                      u64 map_flags)
1684 {
1685         return -EOPNOTSUPP;
1686 }
1687 #endif /* CONFIG_BPF_SYSCALL */
1688 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
1689 
1690 /* verifier prototypes for helper functions called from eBPF programs */
1691 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
1692 extern const struct bpf_func_proto bpf_map_update_elem_proto;
1693 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
1694 extern const struct bpf_func_proto bpf_map_push_elem_proto;
1695 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
1696 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
1697 
1698 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
1699 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
1700 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
1701 extern const struct bpf_func_proto bpf_tail_call_proto;
1702 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
1703 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
1704 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
1705 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
1706 extern const struct bpf_func_proto bpf_get_current_comm_proto;
1707 extern const struct bpf_func_proto bpf_get_stackid_proto;
1708 extern const struct bpf_func_proto bpf_get_stack_proto;
1709 extern const struct bpf_func_proto bpf_get_task_stack_proto;
1710 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
1711 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
1712 extern const struct bpf_func_proto bpf_sock_map_update_proto;
1713 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
1714 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
1715 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
1716 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
1717 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
1718 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
1719 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
1720 extern const struct bpf_func_proto bpf_spin_lock_proto;
1721 extern const struct bpf_func_proto bpf_spin_unlock_proto;
1722 extern const struct bpf_func_proto bpf_get_local_storage_proto;
1723 extern const struct bpf_func_proto bpf_strtol_proto;
1724 extern const struct bpf_func_proto bpf_strtoul_proto;
1725 extern const struct bpf_func_proto bpf_tcp_sock_proto;
1726 extern const struct bpf_func_proto bpf_jiffies64_proto;
1727 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
1728 extern const struct bpf_func_proto bpf_event_output_data_proto;
1729 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
1730 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
1731 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
1732 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
1733 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
1734 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
1735 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
1736 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
1737 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
1738 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
1739 
1740 const struct bpf_func_proto *bpf_tracing_func_proto(
1741         enum bpf_func_id func_id, const struct bpf_prog *prog);
1742 
1743 const struct bpf_func_proto *tracing_prog_func_proto(
1744   enum bpf_func_id func_id, const struct bpf_prog *prog);
1745 
1746 /* Shared helpers among cBPF and eBPF. */
1747 void bpf_user_rnd_init_once(void);
1748 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1749 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1750 
1751 #if defined(CONFIG_NET)
1752 bool bpf_sock_common_is_valid_access(int off, int size,
1753                                      enum bpf_access_type type,
1754                                      struct bpf_insn_access_aux *info);
1755 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1756                               struct bpf_insn_access_aux *info);
1757 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1758                                 const struct bpf_insn *si,
1759                                 struct bpf_insn *insn_buf,
1760                                 struct bpf_prog *prog,
1761                                 u32 *target_size);
1762 #else
1763 static inline bool bpf_sock_common_is_valid_access(int off, int size,
1764                                                    enum bpf_access_type type,
1765                                                    struct bpf_insn_access_aux *info)
1766 {
1767         return false;
1768 }
1769 static inline bool bpf_sock_is_valid_access(int off, int size,
1770                                             enum bpf_access_type type,
1771                                             struct bpf_insn_access_aux *info)
1772 {
1773         return false;
1774 }
1775 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1776                                               const struct bpf_insn *si,
1777                                               struct bpf_insn *insn_buf,
1778                                               struct bpf_prog *prog,
1779                                               u32 *target_size)
1780 {
1781         return 0;
1782 }
1783 #endif
1784 
1785 #ifdef CONFIG_INET
1786 struct sk_reuseport_kern {
1787         struct sk_buff *skb;
1788         struct sock *sk;
1789         struct sock *selected_sk;
1790         void *data_end;
1791         u32 hash;
1792         u32 reuseport_id;
1793         bool bind_inany;
1794 };
1795 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1796                                   struct bpf_insn_access_aux *info);
1797 
1798 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1799                                     const struct bpf_insn *si,
1800                                     struct bpf_insn *insn_buf,
1801                                     struct bpf_prog *prog,
1802                                     u32 *target_size);
1803 
1804 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1805                                   struct bpf_insn_access_aux *info);
1806 
1807 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1808                                     const struct bpf_insn *si,
1809                                     struct bpf_insn *insn_buf,
1810                                     struct bpf_prog *prog,
1811                                     u32 *target_size);
1812 #else
1813 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
1814                                                 enum bpf_access_type type,
1815                                                 struct bpf_insn_access_aux *info)
1816 {
1817         return false;
1818 }
1819 
1820 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1821                                                   const struct bpf_insn *si,
1822                                                   struct bpf_insn *insn_buf,
1823                                                   struct bpf_prog *prog,
1824                                                   u32 *target_size)
1825 {
1826         return 0;
1827 }
1828 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
1829                                                 enum bpf_access_type type,
1830                                                 struct bpf_insn_access_aux *info)
1831 {
1832         return false;
1833 }
1834 
1835 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1836                                                   const struct bpf_insn *si,
1837                                                   struct bpf_insn *insn_buf,
1838                                                   struct bpf_prog *prog,
1839                                                   u32 *target_size)
1840 {
1841         return 0;
1842 }
1843 #endif /* CONFIG_INET */
1844 
1845 enum bpf_text_poke_type {
1846         BPF_MOD_CALL,
1847         BPF_MOD_JUMP,
1848 };
1849 
1850 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
1851                        void *addr1, void *addr2);
1852 
1853 #endif /* _LINUX_BPF_H */
1854 

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