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>
23 struct bpf_verifier_env;
24 struct bpf_verifier_log;
33 struct exception_table_entry;
35 extern struct idr btf_idr;
36 extern spinlock_t btf_idr_lock;
38 /* map is generic key/value storage optionally accesible by eBPF programs */
40 /* funcs callable from userspace (via syscall) */
41 int (*map_alloc_check)(union bpf_attr *attr);
42 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
43 void (*map_release)(struct bpf_map *map, struct file *map_file);
44 void (*map_free)(struct bpf_map *map);
45 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
46 void (*map_release_uref)(struct bpf_map *map);
47 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
48 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
49 union bpf_attr __user *uattr);
50 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
51 const union bpf_attr *attr,
52 union bpf_attr __user *uattr);
53 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
54 union bpf_attr __user *uattr);
55 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
56 union bpf_attr __user *uattr);
58 /* funcs callable from userspace and from eBPF programs */
59 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
60 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
61 int (*map_delete_elem)(struct bpf_map *map, void *key);
62 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
63 int (*map_pop_elem)(struct bpf_map *map, void *value);
64 int (*map_peek_elem)(struct bpf_map *map, void *value);
66 /* funcs called by prog_array and perf_event_array map */
67 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
69 void (*map_fd_put_ptr)(void *ptr);
70 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
71 u32 (*map_fd_sys_lookup_elem)(void *ptr);
72 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
74 int (*map_check_btf)(const struct bpf_map *map,
75 const struct btf *btf,
76 const struct btf_type *key_type,
77 const struct btf_type *value_type);
79 /* Prog poke tracking helpers. */
80 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
81 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
82 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
83 struct bpf_prog *new);
85 /* Direct value access helpers. */
86 int (*map_direct_value_addr)(const struct bpf_map *map,
88 int (*map_direct_value_meta)(const struct bpf_map *map,
90 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
93 struct bpf_map_memory {
95 struct user_struct *user;
99 /* The first two cachelines with read-mostly members of which some
100 * are also accessed in fast-path (e.g. ops, max_entries).
102 const struct bpf_map_ops *ops ____cacheline_aligned;
103 struct bpf_map *inner_map_meta;
104 #ifdef CONFIG_SECURITY
107 enum bpf_map_type map_type;
112 int spin_lock_off; /* >=0 valid offset, <0 error */
116 u32 btf_value_type_id;
118 struct bpf_map_memory memory;
119 char name[BPF_OBJ_NAME_LEN];
120 u32 btf_vmlinux_value_type_id;
122 bool frozen; /* write-once; write-protected by freeze_mutex */
125 /* The 3rd and 4th cacheline with misc members to avoid false sharing
126 * particularly with refcounting.
128 atomic64_t refcnt ____cacheline_aligned;
130 struct work_struct work;
131 struct mutex freeze_mutex;
132 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
135 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
137 return map->spin_lock_off >= 0;
140 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
142 if (likely(!map_value_has_spin_lock(map)))
144 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
145 (struct bpf_spin_lock){};
148 /* copy everything but bpf_spin_lock */
149 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
151 if (unlikely(map_value_has_spin_lock(map))) {
152 u32 off = map->spin_lock_off;
154 memcpy(dst, src, off);
155 memcpy(dst + off + sizeof(struct bpf_spin_lock),
156 src + off + sizeof(struct bpf_spin_lock),
157 map->value_size - off - sizeof(struct bpf_spin_lock));
159 memcpy(dst, src, map->value_size);
162 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
165 struct bpf_offload_dev;
166 struct bpf_offloaded_map;
168 struct bpf_map_dev_ops {
169 int (*map_get_next_key)(struct bpf_offloaded_map *map,
170 void *key, void *next_key);
171 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
172 void *key, void *value);
173 int (*map_update_elem)(struct bpf_offloaded_map *map,
174 void *key, void *value, u64 flags);
175 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
178 struct bpf_offloaded_map {
180 struct net_device *netdev;
181 const struct bpf_map_dev_ops *dev_ops;
183 struct list_head offloads;
186 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
188 return container_of(map, struct bpf_offloaded_map, map);
191 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
193 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
196 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
198 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
199 map->ops->map_seq_show_elem;
202 int map_check_no_btf(const struct bpf_map *map,
203 const struct btf *btf,
204 const struct btf_type *key_type,
205 const struct btf_type *value_type);
207 extern const struct bpf_map_ops bpf_map_offload_ops;
209 /* function argument constraints */
211 ARG_DONTCARE = 0, /* unused argument in helper function */
213 /* the following constraints used to prototype
214 * bpf_map_lookup/update/delete_elem() functions
216 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
217 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
218 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
219 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
220 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */
222 /* the following constraints used to prototype bpf_memcmp() and other
223 * functions that access data on eBPF program stack
225 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
226 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
227 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
228 * helper function must fill all bytes or clear
229 * them in error case.
232 ARG_CONST_SIZE, /* number of bytes accessed from memory */
233 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
235 ARG_PTR_TO_CTX, /* pointer to context */
236 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
237 ARG_ANYTHING, /* any (initialized) argument is ok */
238 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
239 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
240 ARG_PTR_TO_INT, /* pointer to int */
241 ARG_PTR_TO_LONG, /* pointer to long */
242 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
243 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
246 /* type of values returned from helper functions */
247 enum bpf_return_type {
248 RET_INTEGER, /* function returns integer */
249 RET_VOID, /* function doesn't return anything */
250 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
251 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
252 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */
253 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */
254 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
257 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
258 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
259 * instructions after verifying
261 struct bpf_func_proto {
262 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
265 enum bpf_return_type ret_type;
268 enum bpf_arg_type arg1_type;
269 enum bpf_arg_type arg2_type;
270 enum bpf_arg_type arg3_type;
271 enum bpf_arg_type arg4_type;
272 enum bpf_arg_type arg5_type;
274 enum bpf_arg_type arg_type[5];
276 int *btf_id; /* BTF ids of arguments */
279 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
280 * the first argument to eBPF programs.
281 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
285 enum bpf_access_type {
290 /* types of values stored in eBPF registers */
291 /* Pointer types represent:
294 * pointer + (u16) var
295 * pointer + (u16) var + imm
296 * if (range > 0) then [ptr, ptr + range - off) is safe to access
297 * if (id > 0) means that some 'var' was added
298 * if (off > 0) means that 'imm' was added
301 NOT_INIT = 0, /* nothing was written into register */
302 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
303 PTR_TO_CTX, /* reg points to bpf_context */
304 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
305 PTR_TO_MAP_VALUE, /* reg points to map element value */
306 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
307 PTR_TO_STACK, /* reg == frame_pointer + offset */
308 PTR_TO_PACKET_META, /* skb->data - meta_len */
309 PTR_TO_PACKET, /* reg points to skb->data */
310 PTR_TO_PACKET_END, /* skb->data + headlen */
311 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
312 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
313 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */
314 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
315 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
316 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
317 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
318 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
319 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
320 PTR_TO_BTF_ID, /* reg points to kernel struct */
323 /* The information passed from prog-specific *_is_valid_access
324 * back to the verifier.
326 struct bpf_insn_access_aux {
327 enum bpf_reg_type reg_type;
332 struct bpf_verifier_log *log; /* for verbose logs */
336 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
338 aux->ctx_field_size = size;
341 struct bpf_prog_ops {
342 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
343 union bpf_attr __user *uattr);
346 struct bpf_verifier_ops {
347 /* return eBPF function prototype for verification */
348 const struct bpf_func_proto *
349 (*get_func_proto)(enum bpf_func_id func_id,
350 const struct bpf_prog *prog);
352 /* return true if 'size' wide access at offset 'off' within bpf_context
353 * with 'type' (read or write) is allowed
355 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
356 const struct bpf_prog *prog,
357 struct bpf_insn_access_aux *info);
358 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
359 const struct bpf_prog *prog);
360 int (*gen_ld_abs)(const struct bpf_insn *orig,
361 struct bpf_insn *insn_buf);
362 u32 (*convert_ctx_access)(enum bpf_access_type type,
363 const struct bpf_insn *src,
364 struct bpf_insn *dst,
365 struct bpf_prog *prog, u32 *target_size);
366 int (*btf_struct_access)(struct bpf_verifier_log *log,
367 const struct btf_type *t, int off, int size,
368 enum bpf_access_type atype,
372 struct bpf_prog_offload_ops {
373 /* verifier basic callbacks */
374 int (*insn_hook)(struct bpf_verifier_env *env,
375 int insn_idx, int prev_insn_idx);
376 int (*finalize)(struct bpf_verifier_env *env);
377 /* verifier optimization callbacks (called after .finalize) */
378 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
379 struct bpf_insn *insn);
380 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
381 /* program management callbacks */
382 int (*prepare)(struct bpf_prog *prog);
383 int (*translate)(struct bpf_prog *prog);
384 void (*destroy)(struct bpf_prog *prog);
387 struct bpf_prog_offload {
388 struct bpf_prog *prog;
389 struct net_device *netdev;
390 struct bpf_offload_dev *offdev;
392 struct list_head offloads;
399 enum bpf_cgroup_storage_type {
400 BPF_CGROUP_STORAGE_SHARED,
401 BPF_CGROUP_STORAGE_PERCPU,
402 __BPF_CGROUP_STORAGE_MAX
405 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
407 /* The longest tracepoint has 12 args.
408 * See include/trace/bpf_probe.h
410 #define MAX_BPF_FUNC_ARGS 12
412 struct bpf_prog_stats {
415 struct u64_stats_sync syncp;
416 } __aligned(2 * sizeof(u64));
418 struct btf_func_model {
421 u8 arg_size[MAX_BPF_FUNC_ARGS];
424 /* Restore arguments before returning from trampoline to let original function
425 * continue executing. This flag is used for fentry progs when there are no
428 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
429 /* Call original function after fentry progs, but before fexit progs.
430 * Makes sense for fentry/fexit, normal calls and indirect calls.
432 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
433 /* Skip current frame and return to parent. Makes sense for fentry/fexit
434 * programs only. Should not be used with normal calls and indirect calls.
436 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
438 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
439 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
441 #define BPF_MAX_TRAMP_PROGS 40
443 struct bpf_tramp_progs {
444 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
448 /* Different use cases for BPF trampoline:
449 * 1. replace nop at the function entry (kprobe equivalent)
450 * flags = BPF_TRAMP_F_RESTORE_REGS
451 * fentry = a set of programs to run before returning from trampoline
453 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
454 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
455 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
456 * fentry = a set of program to run before calling original function
457 * fexit = a set of program to run after original function
459 * 3. replace direct call instruction anywhere in the function body
460 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
462 * fentry = a set of programs to run before returning from trampoline
463 * With flags = BPF_TRAMP_F_CALL_ORIG
464 * orig_call = original callback addr or direct function addr
465 * fentry = a set of program to run before calling original function
466 * fexit = a set of program to run after original function
468 int arch_prepare_bpf_trampoline(void *image, void *image_end,
469 const struct btf_func_model *m, u32 flags,
470 struct bpf_tramp_progs *tprogs,
472 /* these two functions are called from generated trampoline */
473 u64 notrace __bpf_prog_enter(void);
474 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
479 char name[KSYM_NAME_LEN];
480 struct list_head lnode;
481 struct latch_tree_node tnode;
485 enum bpf_tramp_prog_type {
488 BPF_TRAMP_MODIFY_RETURN,
490 BPF_TRAMP_REPLACE, /* more than MAX */
493 struct bpf_trampoline {
494 /* hlist for trampoline_table */
495 struct hlist_node hlist;
496 /* serializes access to fields of this trampoline */
501 struct btf_func_model model;
505 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
506 * program by replacing one of its functions. func.addr is the address
507 * of the function it replaced.
509 struct bpf_prog *extension_prog;
510 /* list of BPF programs using this trampoline */
511 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
512 /* Number of attached programs. A counter per kind. */
513 int progs_cnt[BPF_TRAMP_MAX];
514 /* Executable image of trampoline */
517 struct bpf_ksym ksym;
520 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
522 struct bpf_dispatcher_prog {
523 struct bpf_prog *prog;
527 struct bpf_dispatcher {
528 /* dispatcher mutex */
531 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
535 struct bpf_ksym ksym;
538 static __always_inline unsigned int bpf_dispatcher_nop_func(
540 const struct bpf_insn *insnsi,
541 unsigned int (*bpf_func)(const void *,
542 const struct bpf_insn *))
544 return bpf_func(ctx, insnsi);
546 #ifdef CONFIG_BPF_JIT
547 struct bpf_trampoline *bpf_trampoline_lookup(u64 key);
548 int bpf_trampoline_link_prog(struct bpf_prog *prog);
549 int bpf_trampoline_unlink_prog(struct bpf_prog *prog);
550 void bpf_trampoline_put(struct bpf_trampoline *tr);
551 #define BPF_DISPATCHER_INIT(_name) { \
552 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
553 .func = &_name##_func, \
560 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
564 #define DEFINE_BPF_DISPATCHER(name) \
565 noinline unsigned int bpf_dispatcher_##name##_func( \
567 const struct bpf_insn *insnsi, \
568 unsigned int (*bpf_func)(const void *, \
569 const struct bpf_insn *)) \
571 return bpf_func(ctx, insnsi); \
573 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
574 struct bpf_dispatcher bpf_dispatcher_##name = \
575 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
576 #define DECLARE_BPF_DISPATCHER(name) \
577 unsigned int bpf_dispatcher_##name##_func( \
579 const struct bpf_insn *insnsi, \
580 unsigned int (*bpf_func)(const void *, \
581 const struct bpf_insn *)); \
582 extern struct bpf_dispatcher bpf_dispatcher_##name;
583 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
584 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
585 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
586 struct bpf_prog *to);
587 /* Called only from JIT-enabled code, so there's no need for stubs. */
588 void *bpf_jit_alloc_exec_page(void);
589 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
590 void bpf_image_ksym_del(struct bpf_ksym *ksym);
591 void bpf_ksym_add(struct bpf_ksym *ksym);
592 void bpf_ksym_del(struct bpf_ksym *ksym);
594 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
598 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog)
602 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
606 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
607 #define DEFINE_BPF_DISPATCHER(name)
608 #define DECLARE_BPF_DISPATCHER(name)
609 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
610 #define BPF_DISPATCHER_PTR(name) NULL
611 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
612 struct bpf_prog *from,
613 struct bpf_prog *to) {}
614 static inline bool is_bpf_image_address(unsigned long address)
620 struct bpf_func_info_aux {
625 enum bpf_jit_poke_reason {
626 BPF_POKE_REASON_TAIL_CALL,
629 /* Descriptor of pokes pointing /into/ the JITed image. */
630 struct bpf_jit_poke_descriptor {
643 struct bpf_prog_aux {
651 u32 func_cnt; /* used by non-func prog as the number of func progs */
652 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
653 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
654 struct bpf_prog *linked_prog;
655 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
656 bool offload_requested;
657 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
658 bool func_proto_unreliable;
659 enum bpf_tramp_prog_type trampoline_prog_type;
660 struct bpf_trampoline *trampoline;
661 struct hlist_node tramp_hlist;
662 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
663 const struct btf_type *attach_func_proto;
664 /* function name for valid attach_btf_id */
665 const char *attach_func_name;
666 struct bpf_prog **func;
667 void *jit_data; /* JIT specific data. arch dependent */
668 struct bpf_jit_poke_descriptor *poke_tab;
670 struct bpf_ksym ksym;
671 const struct bpf_prog_ops *ops;
672 struct bpf_map **used_maps;
673 struct bpf_prog *prog;
674 struct user_struct *user;
675 u64 load_time; /* ns since boottime */
676 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
677 char name[BPF_OBJ_NAME_LEN];
678 #ifdef CONFIG_SECURITY
681 struct bpf_prog_offload *offload;
683 struct bpf_func_info *func_info;
684 struct bpf_func_info_aux *func_info_aux;
685 /* bpf_line_info loaded from userspace. linfo->insn_off
686 * has the xlated insn offset.
687 * Both the main and sub prog share the same linfo.
688 * The subprog can access its first linfo by
689 * using the linfo_idx.
691 struct bpf_line_info *linfo;
692 /* jited_linfo is the jited addr of the linfo. It has a
693 * one to one mapping to linfo:
694 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
695 * Both the main and sub prog share the same jited_linfo.
696 * The subprog can access its first jited_linfo by
697 * using the linfo_idx.
702 /* subprog can use linfo_idx to access its first linfo and
704 * main prog always has linfo_idx == 0
708 struct exception_table_entry *extable;
709 struct bpf_prog_stats __percpu *stats;
711 struct work_struct work;
716 struct bpf_array_aux {
717 /* 'Ownership' of prog array is claimed by the first program that
718 * is going to use this map or by the first program which FD is
719 * stored in the map to make sure that all callers and callees have
720 * the same prog type and JITed flag.
722 enum bpf_prog_type type;
724 /* Programs with direct jumps into programs part of this array. */
725 struct list_head poke_progs;
727 struct mutex poke_mutex;
728 struct work_struct work;
731 struct bpf_struct_ops_value;
735 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
736 struct bpf_struct_ops {
737 const struct bpf_verifier_ops *verifier_ops;
738 int (*init)(struct btf *btf);
739 int (*check_member)(const struct btf_type *t,
740 const struct btf_member *member);
741 int (*init_member)(const struct btf_type *t,
742 const struct btf_member *member,
743 void *kdata, const void *udata);
744 int (*reg)(void *kdata);
745 void (*unreg)(void *kdata);
746 const struct btf_type *type;
747 const struct btf_type *value_type;
749 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
754 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
755 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
756 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
757 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
758 bool bpf_struct_ops_get(const void *kdata);
759 void bpf_struct_ops_put(const void *kdata);
760 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
762 static inline bool bpf_try_module_get(const void *data, struct module *owner)
764 if (owner == BPF_MODULE_OWNER)
765 return bpf_struct_ops_get(data);
767 return try_module_get(owner);
769 static inline void bpf_module_put(const void *data, struct module *owner)
771 if (owner == BPF_MODULE_OWNER)
772 bpf_struct_ops_put(data);
777 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
781 static inline void bpf_struct_ops_init(struct btf *btf,
782 struct bpf_verifier_log *log)
785 static inline bool bpf_try_module_get(const void *data, struct module *owner)
787 return try_module_get(owner);
789 static inline void bpf_module_put(const void *data, struct module *owner)
793 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
805 struct bpf_array_aux *aux;
807 char value[0] __aligned(8);
808 void *ptrs[0] __aligned(8);
809 void __percpu *pptrs[0] __aligned(8);
813 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
814 #define MAX_TAIL_CALL_CNT 32
816 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
817 BPF_F_RDONLY_PROG | \
821 #define BPF_MAP_CAN_READ BIT(0)
822 #define BPF_MAP_CAN_WRITE BIT(1)
824 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
826 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
828 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
831 if (access_flags & BPF_F_RDONLY_PROG)
832 return BPF_MAP_CAN_READ;
833 else if (access_flags & BPF_F_WRONLY_PROG)
834 return BPF_MAP_CAN_WRITE;
836 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
839 static inline bool bpf_map_flags_access_ok(u32 access_flags)
841 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
842 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
845 struct bpf_event_entry {
846 struct perf_event *event;
847 struct file *perf_file;
848 struct file *map_file;
852 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
853 int bpf_prog_calc_tag(struct bpf_prog *fp);
854 const char *kernel_type_name(u32 btf_type_id);
856 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
858 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
859 unsigned long off, unsigned long len);
860 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
861 const struct bpf_insn *src,
862 struct bpf_insn *dst,
863 struct bpf_prog *prog,
866 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
867 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
869 /* an array of programs to be executed under rcu_lock.
872 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
874 * the structure returned by bpf_prog_array_alloc() should be populated
875 * with program pointers and the last pointer must be NULL.
876 * The user has to keep refcnt on the program and make sure the program
877 * is removed from the array before bpf_prog_put().
878 * The 'struct bpf_prog_array *' should only be replaced with xchg()
879 * since other cpus are walking the array of pointers in parallel.
881 struct bpf_prog_array_item {
882 struct bpf_prog *prog;
883 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
886 struct bpf_prog_array {
888 struct bpf_prog_array_item items[];
891 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
892 void bpf_prog_array_free(struct bpf_prog_array *progs);
893 int bpf_prog_array_length(struct bpf_prog_array *progs);
894 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
895 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
896 __u32 __user *prog_ids, u32 cnt);
898 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
899 struct bpf_prog *old_prog);
900 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
901 u32 *prog_ids, u32 request_cnt,
903 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
904 struct bpf_prog *exclude_prog,
905 struct bpf_prog *include_prog,
906 struct bpf_prog_array **new_array);
908 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \
910 struct bpf_prog_array_item *_item; \
911 struct bpf_prog *_prog; \
912 struct bpf_prog_array *_array; \
916 _array = rcu_dereference(array); \
917 if (unlikely(check_non_null && !_array))\
919 _item = &_array->items[0]; \
920 while ((_prog = READ_ONCE(_item->prog))) { \
921 bpf_cgroup_storage_set(_item->cgroup_storage); \
922 _ret &= func(_prog, ctx); \
931 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
932 * so BPF programs can request cwr for TCP packets.
934 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
935 * packet. This macro changes the behavior so the low order bit
936 * indicates whether the packet should be dropped (0) or not (1)
937 * and the next bit is a congestion notification bit. This could be
938 * used by TCP to call tcp_enter_cwr()
940 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
943 * 2: drop packet and cn
944 * 3: keep packet and cn
946 * This macro then converts it to one of the NET_XMIT or an error
947 * code that is then interpreted as drop packet (and no cn):
948 * 0: NET_XMIT_SUCCESS skb should be transmitted
949 * 1: NET_XMIT_DROP skb should be dropped and cn
950 * 2: NET_XMIT_CN skb should be transmitted and cn
951 * 3: -EPERM skb should be dropped
953 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
955 struct bpf_prog_array_item *_item; \
956 struct bpf_prog *_prog; \
957 struct bpf_prog_array *_array; \
963 _array = rcu_dereference(array); \
964 _item = &_array->items[0]; \
965 while ((_prog = READ_ONCE(_item->prog))) { \
966 bpf_cgroup_storage_set(_item->cgroup_storage); \
967 ret = func(_prog, ctx); \
975 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
977 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
981 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \
982 __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
984 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
985 __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
987 #ifdef CONFIG_BPF_SYSCALL
988 DECLARE_PER_CPU(int, bpf_prog_active);
991 * Block execution of BPF programs attached to instrumentation (perf,
992 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
993 * these events can happen inside a region which holds a map bucket lock
994 * and can deadlock on it.
996 * Use the preemption safe inc/dec variants on RT because migrate disable
997 * is preemptible on RT and preemption in the middle of the RMW operation
998 * might lead to inconsistent state. Use the raw variants for non RT
999 * kernels as migrate_disable() maps to preempt_disable() so the slightly
1000 * more expensive save operation can be avoided.
1002 static inline void bpf_disable_instrumentation(void)
1005 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1006 this_cpu_inc(bpf_prog_active);
1008 __this_cpu_inc(bpf_prog_active);
1011 static inline void bpf_enable_instrumentation(void)
1013 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1014 this_cpu_dec(bpf_prog_active);
1016 __this_cpu_dec(bpf_prog_active);
1020 extern const struct file_operations bpf_map_fops;
1021 extern const struct file_operations bpf_prog_fops;
1023 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1024 extern const struct bpf_prog_ops _name ## _prog_ops; \
1025 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1026 #define BPF_MAP_TYPE(_id, _ops) \
1027 extern const struct bpf_map_ops _ops;
1028 #include <linux/bpf_types.h>
1029 #undef BPF_PROG_TYPE
1032 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1033 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1034 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1036 struct bpf_prog *bpf_prog_get(u32 ufd);
1037 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1039 void bpf_prog_add(struct bpf_prog *prog, int i);
1040 void bpf_prog_sub(struct bpf_prog *prog, int i);
1041 void bpf_prog_inc(struct bpf_prog *prog);
1042 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1043 void bpf_prog_put(struct bpf_prog *prog);
1044 int __bpf_prog_charge(struct user_struct *user, u32 pages);
1045 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
1046 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1047 struct bpf_map **used_maps, u32 len);
1049 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1050 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1052 struct bpf_map *bpf_map_get(u32 ufd);
1053 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1054 struct bpf_map *__bpf_map_get(struct fd f);
1055 void bpf_map_inc(struct bpf_map *map);
1056 void bpf_map_inc_with_uref(struct bpf_map *map);
1057 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1058 void bpf_map_put_with_uref(struct bpf_map *map);
1059 void bpf_map_put(struct bpf_map *map);
1060 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
1061 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
1062 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
1063 void bpf_map_charge_finish(struct bpf_map_memory *mem);
1064 void bpf_map_charge_move(struct bpf_map_memory *dst,
1065 struct bpf_map_memory *src);
1066 void *bpf_map_area_alloc(u64 size, int numa_node);
1067 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1068 void bpf_map_area_free(void *base);
1069 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1070 int generic_map_lookup_batch(struct bpf_map *map,
1071 const union bpf_attr *attr,
1072 union bpf_attr __user *uattr);
1073 int generic_map_update_batch(struct bpf_map *map,
1074 const union bpf_attr *attr,
1075 union bpf_attr __user *uattr);
1076 int generic_map_delete_batch(struct bpf_map *map,
1077 const union bpf_attr *attr,
1078 union bpf_attr __user *uattr);
1080 extern int sysctl_unprivileged_bpf_disabled;
1082 int bpf_map_new_fd(struct bpf_map *map, int flags);
1083 int bpf_prog_new_fd(struct bpf_prog *prog);
1087 struct bpf_link_ops {
1088 void (*release)(struct bpf_link *link);
1089 void (*dealloc)(struct bpf_link *link);
1092 void bpf_link_init(struct bpf_link *link, const struct bpf_link_ops *ops,
1093 struct bpf_prog *prog);
1094 void bpf_link_inc(struct bpf_link *link);
1095 void bpf_link_put(struct bpf_link *link);
1096 int bpf_link_new_fd(struct bpf_link *link);
1097 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1098 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1100 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1101 int bpf_obj_get_user(const char __user *pathname, int flags);
1103 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1104 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1105 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1107 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1110 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1112 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1113 void *key, void *value, u64 map_flags);
1114 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1115 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1116 void *key, void *value, u64 map_flags);
1117 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1119 int bpf_get_file_flag(int flags);
1120 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
1121 size_t actual_size);
1123 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1124 * forced to use 'long' read/writes to try to atomically copy long counters.
1125 * Best-effort only. No barriers here, since it _will_ race with concurrent
1126 * updates from BPF programs. Called from bpf syscall and mostly used with
1127 * size 8 or 16 bytes, so ask compiler to inline it.
1129 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1131 const long *lsrc = src;
1134 size /= sizeof(long);
1139 /* verify correctness of eBPF program */
1140 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
1141 union bpf_attr __user *uattr);
1142 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1148 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
1149 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
1150 void __dev_flush(void);
1151 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1152 struct net_device *dev_rx);
1153 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1154 struct net_device *dev_rx);
1155 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1156 struct bpf_prog *xdp_prog);
1158 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
1159 void __cpu_map_flush(void);
1160 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1161 struct net_device *dev_rx);
1163 /* Return map's numa specified by userspace */
1164 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1166 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1167 attr->numa_node : NUMA_NO_NODE;
1170 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1171 int array_map_alloc_check(union bpf_attr *attr);
1173 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1174 union bpf_attr __user *uattr);
1175 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1176 union bpf_attr __user *uattr);
1177 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1178 const union bpf_attr *kattr,
1179 union bpf_attr __user *uattr);
1180 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1181 const union bpf_attr *kattr,
1182 union bpf_attr __user *uattr);
1183 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1184 const struct bpf_prog *prog,
1185 struct bpf_insn_access_aux *info);
1186 int btf_struct_access(struct bpf_verifier_log *log,
1187 const struct btf_type *t, int off, int size,
1188 enum bpf_access_type atype,
1190 int btf_resolve_helper_id(struct bpf_verifier_log *log,
1191 const struct bpf_func_proto *fn, int);
1193 int btf_distill_func_proto(struct bpf_verifier_log *log,
1195 const struct btf_type *func_proto,
1196 const char *func_name,
1197 struct btf_func_model *m);
1199 struct bpf_reg_state;
1200 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
1201 struct bpf_reg_state *regs);
1202 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1203 struct bpf_reg_state *reg);
1204 int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
1205 struct btf *btf, const struct btf_type *t);
1207 struct bpf_prog *bpf_prog_by_id(u32 id);
1209 #else /* !CONFIG_BPF_SYSCALL */
1210 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1212 return ERR_PTR(-EOPNOTSUPP);
1215 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1216 enum bpf_prog_type type,
1219 return ERR_PTR(-EOPNOTSUPP);
1222 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1226 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1230 static inline void bpf_prog_put(struct bpf_prog *prog)
1234 static inline void bpf_prog_inc(struct bpf_prog *prog)
1238 static inline struct bpf_prog *__must_check
1239 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1241 return ERR_PTR(-EOPNOTSUPP);
1244 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
1249 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1253 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1258 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map,
1264 static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map,
1270 static inline void __dev_flush(void)
1275 struct bpf_dtab_netdev;
1278 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1279 struct net_device *dev_rx)
1285 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1286 struct net_device *dev_rx)
1293 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1294 struct sk_buff *skb,
1295 struct bpf_prog *xdp_prog)
1301 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
1306 static inline void __cpu_map_flush(void)
1310 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1311 struct xdp_buff *xdp,
1312 struct net_device *dev_rx)
1317 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1318 enum bpf_prog_type type)
1320 return ERR_PTR(-EOPNOTSUPP);
1323 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1324 const union bpf_attr *kattr,
1325 union bpf_attr __user *uattr)
1330 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1331 const union bpf_attr *kattr,
1332 union bpf_attr __user *uattr)
1337 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1338 const union bpf_attr *kattr,
1339 union bpf_attr __user *uattr)
1344 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1345 const union bpf_attr *kattr,
1346 union bpf_attr __user *uattr)
1351 static inline void bpf_map_put(struct bpf_map *map)
1355 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1357 return ERR_PTR(-ENOTSUPP);
1359 #endif /* CONFIG_BPF_SYSCALL */
1361 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1362 enum bpf_prog_type type)
1364 return bpf_prog_get_type_dev(ufd, type, false);
1367 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1369 int bpf_prog_offload_compile(struct bpf_prog *prog);
1370 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1371 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1372 struct bpf_prog *prog);
1374 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1376 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1377 int bpf_map_offload_update_elem(struct bpf_map *map,
1378 void *key, void *value, u64 flags);
1379 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1380 int bpf_map_offload_get_next_key(struct bpf_map *map,
1381 void *key, void *next_key);
1383 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1385 struct bpf_offload_dev *
1386 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1387 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1388 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1389 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1390 struct net_device *netdev);
1391 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1392 struct net_device *netdev);
1393 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
1395 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
1396 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
1398 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
1400 return aux->offload_requested;
1403 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1405 return unlikely(map->ops == &bpf_map_offload_ops);
1408 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
1409 void bpf_map_offload_map_free(struct bpf_map *map);
1411 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
1412 union bpf_attr *attr)
1417 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
1422 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1427 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
1429 return ERR_PTR(-EOPNOTSUPP);
1432 static inline void bpf_map_offload_map_free(struct bpf_map *map)
1435 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
1437 #if defined(CONFIG_BPF_STREAM_PARSER)
1438 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which);
1439 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
1440 void sock_map_unhash(struct sock *sk);
1441 void sock_map_close(struct sock *sk, long timeout);
1443 static inline int sock_map_prog_update(struct bpf_map *map,
1444 struct bpf_prog *prog, u32 which)
1449 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
1450 struct bpf_prog *prog)
1454 #endif /* CONFIG_BPF_STREAM_PARSER */
1456 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
1457 void bpf_sk_reuseport_detach(struct sock *sk);
1458 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
1460 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
1461 void *value, u64 map_flags);
1463 static inline void bpf_sk_reuseport_detach(struct sock *sk)
1467 #ifdef CONFIG_BPF_SYSCALL
1468 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
1469 void *key, void *value)
1474 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
1475 void *key, void *value,
1480 #endif /* CONFIG_BPF_SYSCALL */
1481 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
1483 /* verifier prototypes for helper functions called from eBPF programs */
1484 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
1485 extern const struct bpf_func_proto bpf_map_update_elem_proto;
1486 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
1487 extern const struct bpf_func_proto bpf_map_push_elem_proto;
1488 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
1489 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
1491 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
1492 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
1493 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
1494 extern const struct bpf_func_proto bpf_tail_call_proto;
1495 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
1496 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
1497 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
1498 extern const struct bpf_func_proto bpf_get_current_comm_proto;
1499 extern const struct bpf_func_proto bpf_get_stackid_proto;
1500 extern const struct bpf_func_proto bpf_get_stack_proto;
1501 extern const struct bpf_func_proto bpf_sock_map_update_proto;
1502 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
1503 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
1504 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
1505 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
1506 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
1507 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
1508 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
1509 extern const struct bpf_func_proto bpf_spin_lock_proto;
1510 extern const struct bpf_func_proto bpf_spin_unlock_proto;
1511 extern const struct bpf_func_proto bpf_get_local_storage_proto;
1512 extern const struct bpf_func_proto bpf_strtol_proto;
1513 extern const struct bpf_func_proto bpf_strtoul_proto;
1514 extern const struct bpf_func_proto bpf_tcp_sock_proto;
1515 extern const struct bpf_func_proto bpf_jiffies64_proto;
1516 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
1518 const struct bpf_func_proto *bpf_tracing_func_proto(
1519 enum bpf_func_id func_id, const struct bpf_prog *prog);
1521 /* Shared helpers among cBPF and eBPF. */
1522 void bpf_user_rnd_init_once(void);
1523 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1525 #if defined(CONFIG_NET)
1526 bool bpf_sock_common_is_valid_access(int off, int size,
1527 enum bpf_access_type type,
1528 struct bpf_insn_access_aux *info);
1529 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1530 struct bpf_insn_access_aux *info);
1531 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1532 const struct bpf_insn *si,
1533 struct bpf_insn *insn_buf,
1534 struct bpf_prog *prog,
1537 static inline bool bpf_sock_common_is_valid_access(int off, int size,
1538 enum bpf_access_type type,
1539 struct bpf_insn_access_aux *info)
1543 static inline bool bpf_sock_is_valid_access(int off, int size,
1544 enum bpf_access_type type,
1545 struct bpf_insn_access_aux *info)
1549 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1550 const struct bpf_insn *si,
1551 struct bpf_insn *insn_buf,
1552 struct bpf_prog *prog,
1560 struct sk_reuseport_kern {
1561 struct sk_buff *skb;
1563 struct sock *selected_sk;
1569 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1570 struct bpf_insn_access_aux *info);
1572 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1573 const struct bpf_insn *si,
1574 struct bpf_insn *insn_buf,
1575 struct bpf_prog *prog,
1578 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1579 struct bpf_insn_access_aux *info);
1581 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1582 const struct bpf_insn *si,
1583 struct bpf_insn *insn_buf,
1584 struct bpf_prog *prog,
1587 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
1588 enum bpf_access_type type,
1589 struct bpf_insn_access_aux *info)
1594 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1595 const struct bpf_insn *si,
1596 struct bpf_insn *insn_buf,
1597 struct bpf_prog *prog,
1602 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
1603 enum bpf_access_type type,
1604 struct bpf_insn_access_aux *info)
1609 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1610 const struct bpf_insn *si,
1611 struct bpf_insn *insn_buf,
1612 struct bpf_prog *prog,
1617 #endif /* CONFIG_INET */
1619 enum bpf_text_poke_type {
1624 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
1625 void *addr1, void *addr2);
1627 #endif /* _LINUX_BPF_H */