1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
7 #include <uapi/linux/bpf.h>
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>
24 struct bpf_verifier_env;
25 struct bpf_verifier_log;
34 struct exception_table_entry;
35 struct seq_operations;
36 struct bpf_iter_aux_info;
38 extern struct idr btf_idr;
39 extern spinlock_t btf_idr_lock;
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;
51 /* map is generic key/value storage optionally accesible by eBPF programs */
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);
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);
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,
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,
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);
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);
98 /* Direct value access helpers. */
99 int (*map_direct_value_addr)(const struct bpf_map *map,
101 int (*map_direct_value_meta)(const struct bpf_map *map,
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);
107 /* BTF name and id of struct allocated by map_alloc */
108 const char * const map_btf_name;
111 /* bpf_iter info used to open a seq_file */
112 const struct bpf_iter_seq_info *iter_seq_info;
115 struct bpf_map_memory {
117 struct user_struct *user;
121 /* The first two cachelines with read-mostly members of which some
122 * are also accessed in fast-path (e.g. ops, max_entries).
124 const struct bpf_map_ops *ops ____cacheline_aligned;
125 struct bpf_map *inner_map_meta;
126 #ifdef CONFIG_SECURITY
129 enum bpf_map_type map_type;
134 int spin_lock_off; /* >=0 valid offset, <0 error */
138 u32 btf_value_type_id;
140 struct bpf_map_memory memory;
141 char name[BPF_OBJ_NAME_LEN];
142 u32 btf_vmlinux_value_type_id;
144 bool frozen; /* write-once; write-protected by freeze_mutex */
147 /* The 3rd and 4th cacheline with misc members to avoid false sharing
148 * particularly with refcounting.
150 atomic64_t refcnt ____cacheline_aligned;
152 struct work_struct work;
153 struct mutex freeze_mutex;
154 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
157 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
159 return map->spin_lock_off >= 0;
162 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
164 if (likely(!map_value_has_spin_lock(map)))
166 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
167 (struct bpf_spin_lock){};
170 /* copy everything but bpf_spin_lock */
171 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
173 if (unlikely(map_value_has_spin_lock(map))) {
174 u32 off = map->spin_lock_off;
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));
181 memcpy(dst, src, map->value_size);
184 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
186 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
188 struct bpf_offload_dev;
189 struct bpf_offloaded_map;
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);
201 struct bpf_offloaded_map {
203 struct net_device *netdev;
204 const struct bpf_map_dev_ops *dev_ops;
206 struct list_head offloads;
209 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
211 return container_of(map, struct bpf_offloaded_map, map);
214 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
216 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
219 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
221 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
222 map->ops->map_seq_show_elem;
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);
230 extern const struct bpf_map_ops bpf_map_offload_ops;
232 /* function argument constraints */
234 ARG_DONTCARE = 0, /* unused argument in helper function */
236 /* the following constraints used to prototype
237 * bpf_map_lookup/update/delete_elem() functions
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 */
245 /* the following constraints used to prototype bpf_memcmp() and other
246 * functions that access data on eBPF program stack
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.
255 ARG_CONST_SIZE, /* number of bytes accessed from memory */
256 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
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 */
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 */
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
290 struct bpf_func_proto {
291 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
294 enum bpf_return_type ret_type;
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;
303 enum bpf_arg_type arg_type[5];
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
311 int *ret_btf_id; /* return value btf_id */
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 *'
320 enum bpf_access_type {
325 /* types of values stored in eBPF registers */
326 /* Pointer types represent:
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
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 */
365 /* The information passed from prog-specific *_is_valid_access
366 * back to the verifier.
368 struct bpf_insn_access_aux {
369 enum bpf_reg_type reg_type;
374 struct bpf_verifier_log *log; /* for verbose logs */
378 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
380 aux->ctx_field_size = size;
383 struct bpf_prog_ops {
384 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
385 union bpf_attr __user *uattr);
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);
394 /* return true if 'size' wide access at offset 'off' within bpf_context
395 * with 'type' (read or write) is allowed
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,
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);
429 struct bpf_prog_offload {
430 struct bpf_prog *prog;
431 struct net_device *netdev;
432 struct bpf_offload_dev *offdev;
434 struct list_head offloads;
441 enum bpf_cgroup_storage_type {
442 BPF_CGROUP_STORAGE_SHARED,
443 BPF_CGROUP_STORAGE_PERCPU,
444 __BPF_CGROUP_STORAGE_MAX
447 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
449 /* The longest tracepoint has 12 args.
450 * See include/trace/bpf_probe.h
452 #define MAX_BPF_FUNC_ARGS 12
454 struct bpf_prog_stats {
457 struct u64_stats_sync syncp;
458 } __aligned(2 * sizeof(u64));
460 struct btf_func_model {
463 u8 arg_size[MAX_BPF_FUNC_ARGS];
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
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.
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.
478 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
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
483 #define BPF_MAX_TRAMP_PROGS 40
485 struct bpf_tramp_progs {
486 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
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
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
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)
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
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,
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);
521 char name[KSYM_NAME_LEN];
522 struct list_head lnode;
523 struct latch_tree_node tnode;
527 enum bpf_tramp_prog_type {
530 BPF_TRAMP_MODIFY_RETURN,
532 BPF_TRAMP_REPLACE, /* more than MAX */
535 struct bpf_trampoline {
536 /* hlist for trampoline_table */
537 struct hlist_node hlist;
538 /* serializes access to fields of this trampoline */
543 struct btf_func_model model;
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.
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 */
559 struct bpf_ksym ksym;
562 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
564 struct bpf_dispatcher_prog {
565 struct bpf_prog *prog;
569 struct bpf_dispatcher {
570 /* dispatcher mutex */
573 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
577 struct bpf_ksym ksym;
580 static __always_inline unsigned int bpf_dispatcher_nop_func(
582 const struct bpf_insn *insnsi,
583 unsigned int (*bpf_func)(const void *,
584 const struct bpf_insn *))
586 return bpf_func(ctx, insnsi);
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, \
602 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
606 #define DEFINE_BPF_DISPATCHER(name) \
607 noinline unsigned int bpf_dispatcher_##name##_func( \
609 const struct bpf_insn *insnsi, \
610 unsigned int (*bpf_func)(const void *, \
611 const struct bpf_insn *)) \
613 return bpf_func(ctx, insnsi); \
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( \
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);
636 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
640 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog)
644 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
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)
662 struct bpf_func_info_aux {
667 enum bpf_jit_poke_reason {
668 BPF_POKE_REASON_TAIL_CALL,
671 /* Descriptor of pokes pointing /into/ the JITed image. */
672 struct bpf_jit_poke_descriptor {
685 /* reg_type info for ctx arguments */
686 struct bpf_ctx_arg_aux {
688 enum bpf_reg_type reg_type;
692 struct bpf_prog_aux {
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;
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;
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
734 struct bpf_prog_offload *offload;
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.
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.
755 /* subprog can use linfo_idx to access its first linfo and
757 * main prog always has linfo_idx == 0
761 struct exception_table_entry *extable;
762 struct bpf_prog_stats __percpu *stats;
764 struct work_struct work;
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.
775 enum bpf_prog_type type;
777 /* Programs with direct jumps into programs part of this array. */
778 struct list_head poke_progs;
780 struct mutex poke_mutex;
781 struct work_struct work;
784 struct bpf_struct_ops_value;
788 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
789 struct bpf_struct_ops {
790 const struct bpf_verifier_ops *verifier_ops;
791 int (*init)(struct btf *btf);
792 int (*check_member)(const struct btf_type *t,
793 const struct btf_member *member);
794 int (*init_member)(const struct btf_type *t,
795 const struct btf_member *member,
796 void *kdata, const void *udata);
797 int (*reg)(void *kdata);
798 void (*unreg)(void *kdata);
799 const struct btf_type *type;
800 const struct btf_type *value_type;
802 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
807 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
808 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
809 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
810 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
811 bool bpf_struct_ops_get(const void *kdata);
812 void bpf_struct_ops_put(const void *kdata);
813 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
815 static inline bool bpf_try_module_get(const void *data, struct module *owner)
817 if (owner == BPF_MODULE_OWNER)
818 return bpf_struct_ops_get(data);
820 return try_module_get(owner);
822 static inline void bpf_module_put(const void *data, struct module *owner)
824 if (owner == BPF_MODULE_OWNER)
825 bpf_struct_ops_put(data);
830 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
834 static inline void bpf_struct_ops_init(struct btf *btf,
835 struct bpf_verifier_log *log)
838 static inline bool bpf_try_module_get(const void *data, struct module *owner)
840 return try_module_get(owner);
842 static inline void bpf_module_put(const void *data, struct module *owner)
846 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
858 struct bpf_array_aux *aux;
860 char value[0] __aligned(8);
861 void *ptrs[0] __aligned(8);
862 void __percpu *pptrs[0] __aligned(8);
866 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
867 #define MAX_TAIL_CALL_CNT 32
869 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
870 BPF_F_RDONLY_PROG | \
874 #define BPF_MAP_CAN_READ BIT(0)
875 #define BPF_MAP_CAN_WRITE BIT(1)
877 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
879 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
881 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
884 if (access_flags & BPF_F_RDONLY_PROG)
885 return BPF_MAP_CAN_READ;
886 else if (access_flags & BPF_F_WRONLY_PROG)
887 return BPF_MAP_CAN_WRITE;
889 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
892 static inline bool bpf_map_flags_access_ok(u32 access_flags)
894 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
895 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
898 struct bpf_event_entry {
899 struct perf_event *event;
900 struct file *perf_file;
901 struct file *map_file;
905 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
906 int bpf_prog_calc_tag(struct bpf_prog *fp);
907 const char *kernel_type_name(u32 btf_type_id);
909 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
911 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
912 unsigned long off, unsigned long len);
913 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
914 const struct bpf_insn *src,
915 struct bpf_insn *dst,
916 struct bpf_prog *prog,
919 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
920 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
922 /* an array of programs to be executed under rcu_lock.
925 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
927 * the structure returned by bpf_prog_array_alloc() should be populated
928 * with program pointers and the last pointer must be NULL.
929 * The user has to keep refcnt on the program and make sure the program
930 * is removed from the array before bpf_prog_put().
931 * The 'struct bpf_prog_array *' should only be replaced with xchg()
932 * since other cpus are walking the array of pointers in parallel.
934 struct bpf_prog_array_item {
935 struct bpf_prog *prog;
936 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
939 struct bpf_prog_array {
941 struct bpf_prog_array_item items[];
944 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
945 void bpf_prog_array_free(struct bpf_prog_array *progs);
946 int bpf_prog_array_length(struct bpf_prog_array *progs);
947 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
948 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
949 __u32 __user *prog_ids, u32 cnt);
951 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
952 struct bpf_prog *old_prog);
953 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
954 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
955 struct bpf_prog *prog);
956 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
957 u32 *prog_ids, u32 request_cnt,
959 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
960 struct bpf_prog *exclude_prog,
961 struct bpf_prog *include_prog,
962 struct bpf_prog_array **new_array);
964 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \
966 struct bpf_prog_array_item *_item; \
967 struct bpf_prog *_prog; \
968 struct bpf_prog_array *_array; \
972 _array = rcu_dereference(array); \
973 if (unlikely(check_non_null && !_array))\
975 _item = &_array->items[0]; \
976 while ((_prog = READ_ONCE(_item->prog))) { \
977 bpf_cgroup_storage_set(_item->cgroup_storage); \
978 _ret &= func(_prog, ctx); \
987 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
988 * so BPF programs can request cwr for TCP packets.
990 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
991 * packet. This macro changes the behavior so the low order bit
992 * indicates whether the packet should be dropped (0) or not (1)
993 * and the next bit is a congestion notification bit. This could be
994 * used by TCP to call tcp_enter_cwr()
996 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
999 * 2: drop packet and cn
1000 * 3: keep packet and cn
1002 * This macro then converts it to one of the NET_XMIT or an error
1003 * code that is then interpreted as drop packet (and no cn):
1004 * 0: NET_XMIT_SUCCESS skb should be transmitted
1005 * 1: NET_XMIT_DROP skb should be dropped and cn
1006 * 2: NET_XMIT_CN skb should be transmitted and cn
1007 * 3: -EPERM skb should be dropped
1009 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1011 struct bpf_prog_array_item *_item; \
1012 struct bpf_prog *_prog; \
1013 struct bpf_prog_array *_array; \
1017 migrate_disable(); \
1019 _array = rcu_dereference(array); \
1020 _item = &_array->items[0]; \
1021 while ((_prog = READ_ONCE(_item->prog))) { \
1022 bpf_cgroup_storage_set(_item->cgroup_storage); \
1023 ret = func(_prog, ctx); \
1024 _ret &= (ret & 1); \
1028 rcu_read_unlock(); \
1031 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1033 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1037 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \
1038 __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
1040 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
1041 __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
1043 #ifdef CONFIG_BPF_SYSCALL
1044 DECLARE_PER_CPU(int, bpf_prog_active);
1045 extern struct mutex bpf_stats_enabled_mutex;
1048 * Block execution of BPF programs attached to instrumentation (perf,
1049 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1050 * these events can happen inside a region which holds a map bucket lock
1051 * and can deadlock on it.
1053 * Use the preemption safe inc/dec variants on RT because migrate disable
1054 * is preemptible on RT and preemption in the middle of the RMW operation
1055 * might lead to inconsistent state. Use the raw variants for non RT
1056 * kernels as migrate_disable() maps to preempt_disable() so the slightly
1057 * more expensive save operation can be avoided.
1059 static inline void bpf_disable_instrumentation(void)
1062 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1063 this_cpu_inc(bpf_prog_active);
1065 __this_cpu_inc(bpf_prog_active);
1068 static inline void bpf_enable_instrumentation(void)
1070 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1071 this_cpu_dec(bpf_prog_active);
1073 __this_cpu_dec(bpf_prog_active);
1077 extern const struct file_operations bpf_map_fops;
1078 extern const struct file_operations bpf_prog_fops;
1079 extern const struct file_operations bpf_iter_fops;
1081 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1082 extern const struct bpf_prog_ops _name ## _prog_ops; \
1083 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1084 #define BPF_MAP_TYPE(_id, _ops) \
1085 extern const struct bpf_map_ops _ops;
1086 #define BPF_LINK_TYPE(_id, _name)
1087 #include <linux/bpf_types.h>
1088 #undef BPF_PROG_TYPE
1090 #undef BPF_LINK_TYPE
1092 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1093 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1094 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1096 struct bpf_prog *bpf_prog_get(u32 ufd);
1097 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1099 void bpf_prog_add(struct bpf_prog *prog, int i);
1100 void bpf_prog_sub(struct bpf_prog *prog, int i);
1101 void bpf_prog_inc(struct bpf_prog *prog);
1102 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1103 void bpf_prog_put(struct bpf_prog *prog);
1104 int __bpf_prog_charge(struct user_struct *user, u32 pages);
1105 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
1106 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1107 struct bpf_map **used_maps, u32 len);
1109 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1110 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1112 struct bpf_map *bpf_map_get(u32 ufd);
1113 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1114 struct bpf_map *__bpf_map_get(struct fd f);
1115 void bpf_map_inc(struct bpf_map *map);
1116 void bpf_map_inc_with_uref(struct bpf_map *map);
1117 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1118 void bpf_map_put_with_uref(struct bpf_map *map);
1119 void bpf_map_put(struct bpf_map *map);
1120 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
1121 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
1122 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
1123 void bpf_map_charge_finish(struct bpf_map_memory *mem);
1124 void bpf_map_charge_move(struct bpf_map_memory *dst,
1125 struct bpf_map_memory *src);
1126 void *bpf_map_area_alloc(u64 size, int numa_node);
1127 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1128 void bpf_map_area_free(void *base);
1129 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1130 int generic_map_lookup_batch(struct bpf_map *map,
1131 const union bpf_attr *attr,
1132 union bpf_attr __user *uattr);
1133 int generic_map_update_batch(struct bpf_map *map,
1134 const union bpf_attr *attr,
1135 union bpf_attr __user *uattr);
1136 int generic_map_delete_batch(struct bpf_map *map,
1137 const union bpf_attr *attr,
1138 union bpf_attr __user *uattr);
1139 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1140 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1142 extern int sysctl_unprivileged_bpf_disabled;
1144 static inline bool bpf_allow_ptr_leaks(void)
1146 return perfmon_capable();
1149 static inline bool bpf_allow_ptr_to_map_access(void)
1151 return perfmon_capable();
1154 static inline bool bpf_bypass_spec_v1(void)
1156 return perfmon_capable();
1159 static inline bool bpf_bypass_spec_v4(void)
1161 return perfmon_capable();
1164 int bpf_map_new_fd(struct bpf_map *map, int flags);
1165 int bpf_prog_new_fd(struct bpf_prog *prog);
1170 enum bpf_link_type type;
1171 const struct bpf_link_ops *ops;
1172 struct bpf_prog *prog;
1173 struct work_struct work;
1176 struct bpf_link_primer {
1177 struct bpf_link *link;
1183 struct bpf_link_ops {
1184 void (*release)(struct bpf_link *link);
1185 void (*dealloc)(struct bpf_link *link);
1186 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1187 struct bpf_prog *old_prog);
1188 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1189 int (*fill_link_info)(const struct bpf_link *link,
1190 struct bpf_link_info *info);
1193 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1194 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1195 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1196 int bpf_link_settle(struct bpf_link_primer *primer);
1197 void bpf_link_cleanup(struct bpf_link_primer *primer);
1198 void bpf_link_inc(struct bpf_link *link);
1199 void bpf_link_put(struct bpf_link *link);
1200 int bpf_link_new_fd(struct bpf_link *link);
1201 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1202 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1204 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1205 int bpf_obj_get_user(const char __user *pathname, int flags);
1207 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1208 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1209 extern int bpf_iter_ ## target(args); \
1210 int __init bpf_iter_ ## target(args) { return 0; }
1212 struct bpf_iter_aux_info {
1213 struct bpf_map *map;
1216 typedef int (*bpf_iter_check_target_t)(struct bpf_prog *prog,
1217 struct bpf_iter_aux_info *aux);
1219 #define BPF_ITER_CTX_ARG_MAX 2
1220 struct bpf_iter_reg {
1222 bpf_iter_check_target_t check_target;
1223 u32 ctx_arg_info_size;
1224 enum bpf_iter_link_info req_linfo;
1225 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1226 const struct bpf_iter_seq_info *seq_info;
1229 struct bpf_iter_meta {
1230 __bpf_md_ptr(struct seq_file *, seq);
1235 struct bpf_iter__bpf_map_elem {
1236 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1237 __bpf_md_ptr(struct bpf_map *, map);
1238 __bpf_md_ptr(void *, key);
1239 __bpf_md_ptr(void *, value);
1242 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1243 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1244 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1245 int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
1246 int bpf_iter_new_fd(struct bpf_link *link);
1247 bool bpf_link_is_iter(struct bpf_link *link);
1248 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1249 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1251 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1252 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1253 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1255 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1258 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1260 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1261 void *key, void *value, u64 map_flags);
1262 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1263 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1264 void *key, void *value, u64 map_flags);
1265 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1267 int bpf_get_file_flag(int flags);
1268 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
1269 size_t actual_size);
1271 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1272 * forced to use 'long' read/writes to try to atomically copy long counters.
1273 * Best-effort only. No barriers here, since it _will_ race with concurrent
1274 * updates from BPF programs. Called from bpf syscall and mostly used with
1275 * size 8 or 16 bytes, so ask compiler to inline it.
1277 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1279 const long *lsrc = src;
1282 size /= sizeof(long);
1287 /* verify correctness of eBPF program */
1288 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
1289 union bpf_attr __user *uattr);
1290 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1296 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
1297 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
1298 void __dev_flush(void);
1299 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1300 struct net_device *dev_rx);
1301 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1302 struct net_device *dev_rx);
1303 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1304 struct bpf_prog *xdp_prog);
1305 bool dev_map_can_have_prog(struct bpf_map *map);
1307 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
1308 void __cpu_map_flush(void);
1309 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1310 struct net_device *dev_rx);
1311 bool cpu_map_prog_allowed(struct bpf_map *map);
1313 /* Return map's numa specified by userspace */
1314 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1316 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1317 attr->numa_node : NUMA_NO_NODE;
1320 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1321 int array_map_alloc_check(union bpf_attr *attr);
1323 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1324 union bpf_attr __user *uattr);
1325 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1326 union bpf_attr __user *uattr);
1327 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1328 const union bpf_attr *kattr,
1329 union bpf_attr __user *uattr);
1330 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1331 const union bpf_attr *kattr,
1332 union bpf_attr __user *uattr);
1333 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1334 const struct bpf_prog *prog,
1335 struct bpf_insn_access_aux *info);
1336 int btf_struct_access(struct bpf_verifier_log *log,
1337 const struct btf_type *t, int off, int size,
1338 enum bpf_access_type atype,
1340 int btf_resolve_helper_id(struct bpf_verifier_log *log,
1341 const struct bpf_func_proto *fn, int);
1343 int btf_distill_func_proto(struct bpf_verifier_log *log,
1345 const struct btf_type *func_proto,
1346 const char *func_name,
1347 struct btf_func_model *m);
1349 struct bpf_reg_state;
1350 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
1351 struct bpf_reg_state *regs);
1352 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1353 struct bpf_reg_state *reg);
1354 int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
1355 struct btf *btf, const struct btf_type *t);
1357 struct bpf_prog *bpf_prog_by_id(u32 id);
1359 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1360 #else /* !CONFIG_BPF_SYSCALL */
1361 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1363 return ERR_PTR(-EOPNOTSUPP);
1366 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1367 enum bpf_prog_type type,
1370 return ERR_PTR(-EOPNOTSUPP);
1373 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1377 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1381 static inline void bpf_prog_put(struct bpf_prog *prog)
1385 static inline void bpf_prog_inc(struct bpf_prog *prog)
1389 static inline struct bpf_prog *__must_check
1390 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1392 return ERR_PTR(-EOPNOTSUPP);
1395 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
1400 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1404 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1409 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map,
1415 static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map,
1420 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1425 static inline void __dev_flush(void)
1430 struct bpf_dtab_netdev;
1433 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1434 struct net_device *dev_rx)
1440 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1441 struct net_device *dev_rx)
1448 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1449 struct sk_buff *skb,
1450 struct bpf_prog *xdp_prog)
1456 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
1461 static inline void __cpu_map_flush(void)
1465 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1466 struct xdp_buff *xdp,
1467 struct net_device *dev_rx)
1472 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1477 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1478 enum bpf_prog_type type)
1480 return ERR_PTR(-EOPNOTSUPP);
1483 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1484 const union bpf_attr *kattr,
1485 union bpf_attr __user *uattr)
1490 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1491 const union bpf_attr *kattr,
1492 union bpf_attr __user *uattr)
1497 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1498 const union bpf_attr *kattr,
1499 union bpf_attr __user *uattr)
1504 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1505 const union bpf_attr *kattr,
1506 union bpf_attr __user *uattr)
1511 static inline void bpf_map_put(struct bpf_map *map)
1515 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1517 return ERR_PTR(-ENOTSUPP);
1520 static inline const struct bpf_func_proto *
1521 bpf_base_func_proto(enum bpf_func_id func_id)
1525 #endif /* CONFIG_BPF_SYSCALL */
1527 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1528 enum bpf_prog_type type)
1530 return bpf_prog_get_type_dev(ufd, type, false);
1533 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1535 int bpf_prog_offload_compile(struct bpf_prog *prog);
1536 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1537 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1538 struct bpf_prog *prog);
1540 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1542 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1543 int bpf_map_offload_update_elem(struct bpf_map *map,
1544 void *key, void *value, u64 flags);
1545 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1546 int bpf_map_offload_get_next_key(struct bpf_map *map,
1547 void *key, void *next_key);
1549 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1551 struct bpf_offload_dev *
1552 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1553 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1554 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1555 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1556 struct net_device *netdev);
1557 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1558 struct net_device *netdev);
1559 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
1561 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
1562 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
1564 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
1566 return aux->offload_requested;
1569 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1571 return unlikely(map->ops == &bpf_map_offload_ops);
1574 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
1575 void bpf_map_offload_map_free(struct bpf_map *map);
1577 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
1578 union bpf_attr *attr)
1583 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
1588 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1593 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
1595 return ERR_PTR(-EOPNOTSUPP);
1598 static inline void bpf_map_offload_map_free(struct bpf_map *map)
1601 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
1603 #if defined(CONFIG_BPF_STREAM_PARSER)
1604 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog,
1605 struct bpf_prog *old, u32 which);
1606 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
1607 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
1608 void sock_map_unhash(struct sock *sk);
1609 void sock_map_close(struct sock *sk, long timeout);
1611 static inline int sock_map_prog_update(struct bpf_map *map,
1612 struct bpf_prog *prog,
1613 struct bpf_prog *old, u32 which)
1618 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
1619 struct bpf_prog *prog)
1624 static inline int sock_map_prog_detach(const union bpf_attr *attr,
1625 enum bpf_prog_type ptype)
1629 #endif /* CONFIG_BPF_STREAM_PARSER */
1631 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
1632 void bpf_sk_reuseport_detach(struct sock *sk);
1633 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
1635 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
1636 void *value, u64 map_flags);
1638 static inline void bpf_sk_reuseport_detach(struct sock *sk)
1642 #ifdef CONFIG_BPF_SYSCALL
1643 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
1644 void *key, void *value)
1649 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
1650 void *key, void *value,
1655 #endif /* CONFIG_BPF_SYSCALL */
1656 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
1658 /* verifier prototypes for helper functions called from eBPF programs */
1659 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
1660 extern const struct bpf_func_proto bpf_map_update_elem_proto;
1661 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
1662 extern const struct bpf_func_proto bpf_map_push_elem_proto;
1663 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
1664 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
1666 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
1667 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
1668 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
1669 extern const struct bpf_func_proto bpf_tail_call_proto;
1670 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
1671 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
1672 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
1673 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
1674 extern const struct bpf_func_proto bpf_get_current_comm_proto;
1675 extern const struct bpf_func_proto bpf_get_stackid_proto;
1676 extern const struct bpf_func_proto bpf_get_stack_proto;
1677 extern const struct bpf_func_proto bpf_get_task_stack_proto;
1678 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
1679 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
1680 extern const struct bpf_func_proto bpf_sock_map_update_proto;
1681 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
1682 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
1683 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
1684 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
1685 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
1686 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
1687 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
1688 extern const struct bpf_func_proto bpf_spin_lock_proto;
1689 extern const struct bpf_func_proto bpf_spin_unlock_proto;
1690 extern const struct bpf_func_proto bpf_get_local_storage_proto;
1691 extern const struct bpf_func_proto bpf_strtol_proto;
1692 extern const struct bpf_func_proto bpf_strtoul_proto;
1693 extern const struct bpf_func_proto bpf_tcp_sock_proto;
1694 extern const struct bpf_func_proto bpf_jiffies64_proto;
1695 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
1696 extern const struct bpf_func_proto bpf_event_output_data_proto;
1697 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
1698 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
1699 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
1700 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
1701 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
1702 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
1703 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
1704 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
1705 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
1706 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
1708 const struct bpf_func_proto *bpf_tracing_func_proto(
1709 enum bpf_func_id func_id, const struct bpf_prog *prog);
1711 const struct bpf_func_proto *tracing_prog_func_proto(
1712 enum bpf_func_id func_id, const struct bpf_prog *prog);
1714 /* Shared helpers among cBPF and eBPF. */
1715 void bpf_user_rnd_init_once(void);
1716 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1717 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1719 #if defined(CONFIG_NET)
1720 bool bpf_sock_common_is_valid_access(int off, int size,
1721 enum bpf_access_type type,
1722 struct bpf_insn_access_aux *info);
1723 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1724 struct bpf_insn_access_aux *info);
1725 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1726 const struct bpf_insn *si,
1727 struct bpf_insn *insn_buf,
1728 struct bpf_prog *prog,
1731 static inline bool bpf_sock_common_is_valid_access(int off, int size,
1732 enum bpf_access_type type,
1733 struct bpf_insn_access_aux *info)
1737 static inline bool bpf_sock_is_valid_access(int off, int size,
1738 enum bpf_access_type type,
1739 struct bpf_insn_access_aux *info)
1743 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1744 const struct bpf_insn *si,
1745 struct bpf_insn *insn_buf,
1746 struct bpf_prog *prog,
1754 struct sk_reuseport_kern {
1755 struct sk_buff *skb;
1757 struct sock *selected_sk;
1763 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1764 struct bpf_insn_access_aux *info);
1766 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1767 const struct bpf_insn *si,
1768 struct bpf_insn *insn_buf,
1769 struct bpf_prog *prog,
1772 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1773 struct bpf_insn_access_aux *info);
1775 u32 bpf_xdp_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,
1781 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
1782 enum bpf_access_type type,
1783 struct bpf_insn_access_aux *info)
1788 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1789 const struct bpf_insn *si,
1790 struct bpf_insn *insn_buf,
1791 struct bpf_prog *prog,
1796 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
1797 enum bpf_access_type type,
1798 struct bpf_insn_access_aux *info)
1803 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1804 const struct bpf_insn *si,
1805 struct bpf_insn *insn_buf,
1806 struct bpf_prog *prog,
1811 #endif /* CONFIG_INET */
1813 enum bpf_text_poke_type {
1818 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
1819 void *addr1, void *addr2);
1821 #endif /* _LINUX_BPF_H */