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;
37 struct bpf_local_storage;
38 struct bpf_local_storage_map;
40 extern struct idr btf_idr;
41 extern spinlock_t btf_idr_lock;
43 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
44 struct bpf_iter_aux_info *aux);
45 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
46 struct bpf_iter_seq_info {
47 const struct seq_operations *seq_ops;
48 bpf_iter_init_seq_priv_t init_seq_private;
49 bpf_iter_fini_seq_priv_t fini_seq_private;
53 /* map is generic key/value storage optionally accesible by eBPF programs */
55 /* funcs callable from userspace (via syscall) */
56 int (*map_alloc_check)(union bpf_attr *attr);
57 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
58 void (*map_release)(struct bpf_map *map, struct file *map_file);
59 void (*map_free)(struct bpf_map *map);
60 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
61 void (*map_release_uref)(struct bpf_map *map);
62 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
63 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
64 union bpf_attr __user *uattr);
65 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
66 const union bpf_attr *attr,
67 union bpf_attr __user *uattr);
68 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
69 union bpf_attr __user *uattr);
70 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
71 union bpf_attr __user *uattr);
73 /* funcs callable from userspace and from eBPF programs */
74 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
75 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
76 int (*map_delete_elem)(struct bpf_map *map, void *key);
77 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
78 int (*map_pop_elem)(struct bpf_map *map, void *value);
79 int (*map_peek_elem)(struct bpf_map *map, void *value);
81 /* funcs called by prog_array and perf_event_array map */
82 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
84 void (*map_fd_put_ptr)(void *ptr);
85 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
86 u32 (*map_fd_sys_lookup_elem)(void *ptr);
87 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
89 int (*map_check_btf)(const struct bpf_map *map,
90 const struct btf *btf,
91 const struct btf_type *key_type,
92 const struct btf_type *value_type);
94 /* Prog poke tracking helpers. */
95 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
96 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
97 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
98 struct bpf_prog *new);
100 /* Direct value access helpers. */
101 int (*map_direct_value_addr)(const struct bpf_map *map,
103 int (*map_direct_value_meta)(const struct bpf_map *map,
105 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
106 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
107 struct poll_table_struct *pts);
109 /* Functions called by bpf_local_storage maps */
110 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
111 void *owner, u32 size);
112 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
113 void *owner, u32 size);
114 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
116 /* map_meta_equal must be implemented for maps that can be
117 * used as an inner map. It is a runtime check to ensure
118 * an inner map can be inserted to an outer map.
120 * Some properties of the inner map has been used during the
121 * verification time. When inserting an inner map at the runtime,
122 * map_meta_equal has to ensure the inserting map has the same
123 * properties that the verifier has used earlier.
125 bool (*map_meta_equal)(const struct bpf_map *meta0,
126 const struct bpf_map *meta1);
128 /* BTF name and id of struct allocated by map_alloc */
129 const char * const map_btf_name;
132 /* bpf_iter info used to open a seq_file */
133 const struct bpf_iter_seq_info *iter_seq_info;
136 struct bpf_map_memory {
138 struct user_struct *user;
142 /* The first two cachelines with read-mostly members of which some
143 * are also accessed in fast-path (e.g. ops, max_entries).
145 const struct bpf_map_ops *ops ____cacheline_aligned;
146 struct bpf_map *inner_map_meta;
147 #ifdef CONFIG_SECURITY
150 enum bpf_map_type map_type;
155 int spin_lock_off; /* >=0 valid offset, <0 error */
159 u32 btf_value_type_id;
161 struct bpf_map_memory memory;
162 char name[BPF_OBJ_NAME_LEN];
163 u32 btf_vmlinux_value_type_id;
165 bool frozen; /* write-once; write-protected by freeze_mutex */
168 /* The 3rd and 4th cacheline with misc members to avoid false sharing
169 * particularly with refcounting.
171 atomic64_t refcnt ____cacheline_aligned;
173 struct work_struct work;
174 struct mutex freeze_mutex;
175 u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
178 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
180 return map->spin_lock_off >= 0;
183 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
185 if (likely(!map_value_has_spin_lock(map)))
187 *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
188 (struct bpf_spin_lock){};
191 /* copy everything but bpf_spin_lock */
192 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
194 if (unlikely(map_value_has_spin_lock(map))) {
195 u32 off = map->spin_lock_off;
197 memcpy(dst, src, off);
198 memcpy(dst + off + sizeof(struct bpf_spin_lock),
199 src + off + sizeof(struct bpf_spin_lock),
200 map->value_size - off - sizeof(struct bpf_spin_lock));
202 memcpy(dst, src, map->value_size);
205 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
207 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
209 struct bpf_offload_dev;
210 struct bpf_offloaded_map;
212 struct bpf_map_dev_ops {
213 int (*map_get_next_key)(struct bpf_offloaded_map *map,
214 void *key, void *next_key);
215 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
216 void *key, void *value);
217 int (*map_update_elem)(struct bpf_offloaded_map *map,
218 void *key, void *value, u64 flags);
219 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
222 struct bpf_offloaded_map {
224 struct net_device *netdev;
225 const struct bpf_map_dev_ops *dev_ops;
227 struct list_head offloads;
230 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
232 return container_of(map, struct bpf_offloaded_map, map);
235 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
237 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
240 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
242 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
243 map->ops->map_seq_show_elem;
246 int map_check_no_btf(const struct bpf_map *map,
247 const struct btf *btf,
248 const struct btf_type *key_type,
249 const struct btf_type *value_type);
251 bool bpf_map_meta_equal(const struct bpf_map *meta0,
252 const struct bpf_map *meta1);
254 extern const struct bpf_map_ops bpf_map_offload_ops;
256 /* function argument constraints */
258 ARG_DONTCARE = 0, /* unused argument in helper function */
260 /* the following constraints used to prototype
261 * bpf_map_lookup/update/delete_elem() functions
263 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
264 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
265 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
266 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
267 ARG_PTR_TO_MAP_VALUE_OR_NULL, /* pointer to stack used as map value or NULL */
269 /* the following constraints used to prototype bpf_memcmp() and other
270 * functions that access data on eBPF program stack
272 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
273 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
274 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
275 * helper function must fill all bytes or clear
276 * them in error case.
279 ARG_CONST_SIZE, /* number of bytes accessed from memory */
280 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
282 ARG_PTR_TO_CTX, /* pointer to context */
283 ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
284 ARG_ANYTHING, /* any (initialized) argument is ok */
285 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
286 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
287 ARG_PTR_TO_INT, /* pointer to int */
288 ARG_PTR_TO_LONG, /* pointer to long */
289 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
290 ARG_PTR_TO_SOCKET_OR_NULL, /* pointer to bpf_sock (fullsock) or NULL */
291 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
292 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
293 ARG_PTR_TO_ALLOC_MEM_OR_NULL, /* pointer to dynamically allocated memory or NULL */
294 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
295 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
299 /* type of values returned from helper functions */
300 enum bpf_return_type {
301 RET_INTEGER, /* function returns integer */
302 RET_VOID, /* function doesn't return anything */
303 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
304 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
305 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */
306 RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */
307 RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
308 RET_PTR_TO_ALLOC_MEM_OR_NULL, /* returns a pointer to dynamically allocated memory or NULL */
309 RET_PTR_TO_BTF_ID_OR_NULL, /* returns a pointer to a btf_id or NULL */
312 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
313 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
314 * instructions after verifying
316 struct bpf_func_proto {
317 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
320 enum bpf_return_type ret_type;
323 enum bpf_arg_type arg1_type;
324 enum bpf_arg_type arg2_type;
325 enum bpf_arg_type arg3_type;
326 enum bpf_arg_type arg4_type;
327 enum bpf_arg_type arg5_type;
329 enum bpf_arg_type arg_type[5];
341 int *ret_btf_id; /* return value btf_id */
342 bool (*allowed)(const struct bpf_prog *prog);
345 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
346 * the first argument to eBPF programs.
347 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
351 enum bpf_access_type {
356 /* types of values stored in eBPF registers */
357 /* Pointer types represent:
360 * pointer + (u16) var
361 * pointer + (u16) var + imm
362 * if (range > 0) then [ptr, ptr + range - off) is safe to access
363 * if (id > 0) means that some 'var' was added
364 * if (off > 0) means that 'imm' was added
367 NOT_INIT = 0, /* nothing was written into register */
368 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
369 PTR_TO_CTX, /* reg points to bpf_context */
370 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
371 PTR_TO_MAP_VALUE, /* reg points to map element value */
372 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
373 PTR_TO_STACK, /* reg == frame_pointer + offset */
374 PTR_TO_PACKET_META, /* skb->data - meta_len */
375 PTR_TO_PACKET, /* reg points to skb->data */
376 PTR_TO_PACKET_END, /* skb->data + headlen */
377 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
378 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
379 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */
380 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
381 PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
382 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
383 PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
384 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
385 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
386 /* PTR_TO_BTF_ID points to a kernel struct that does not need
387 * to be null checked by the BPF program. This does not imply the
388 * pointer is _not_ null and in practice this can easily be a null
389 * pointer when reading pointer chains. The assumption is program
390 * context will handle null pointer dereference typically via fault
391 * handling. The verifier must keep this in mind and can make no
392 * assumptions about null or non-null when doing branch analysis.
393 * Further, when passed into helpers the helpers can not, without
394 * additional context, assume the value is non-null.
397 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
398 * been checked for null. Used primarily to inform the verifier
399 * an explicit null check is required for this struct.
401 PTR_TO_BTF_ID_OR_NULL,
402 PTR_TO_MEM, /* reg points to valid memory region */
403 PTR_TO_MEM_OR_NULL, /* reg points to valid memory region or NULL */
404 PTR_TO_RDONLY_BUF, /* reg points to a readonly buffer */
405 PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */
406 PTR_TO_RDWR_BUF, /* reg points to a read/write buffer */
407 PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */
410 /* The information passed from prog-specific *_is_valid_access
411 * back to the verifier.
413 struct bpf_insn_access_aux {
414 enum bpf_reg_type reg_type;
419 struct bpf_verifier_log *log; /* for verbose logs */
423 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
425 aux->ctx_field_size = size;
428 struct bpf_prog_ops {
429 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
430 union bpf_attr __user *uattr);
433 struct bpf_verifier_ops {
434 /* return eBPF function prototype for verification */
435 const struct bpf_func_proto *
436 (*get_func_proto)(enum bpf_func_id func_id,
437 const struct bpf_prog *prog);
439 /* return true if 'size' wide access at offset 'off' within bpf_context
440 * with 'type' (read or write) is allowed
442 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
443 const struct bpf_prog *prog,
444 struct bpf_insn_access_aux *info);
445 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
446 const struct bpf_prog *prog);
447 int (*gen_ld_abs)(const struct bpf_insn *orig,
448 struct bpf_insn *insn_buf);
449 u32 (*convert_ctx_access)(enum bpf_access_type type,
450 const struct bpf_insn *src,
451 struct bpf_insn *dst,
452 struct bpf_prog *prog, u32 *target_size);
453 int (*btf_struct_access)(struct bpf_verifier_log *log,
454 const struct btf_type *t, int off, int size,
455 enum bpf_access_type atype,
459 struct bpf_prog_offload_ops {
460 /* verifier basic callbacks */
461 int (*insn_hook)(struct bpf_verifier_env *env,
462 int insn_idx, int prev_insn_idx);
463 int (*finalize)(struct bpf_verifier_env *env);
464 /* verifier optimization callbacks (called after .finalize) */
465 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
466 struct bpf_insn *insn);
467 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
468 /* program management callbacks */
469 int (*prepare)(struct bpf_prog *prog);
470 int (*translate)(struct bpf_prog *prog);
471 void (*destroy)(struct bpf_prog *prog);
474 struct bpf_prog_offload {
475 struct bpf_prog *prog;
476 struct net_device *netdev;
477 struct bpf_offload_dev *offdev;
479 struct list_head offloads;
486 enum bpf_cgroup_storage_type {
487 BPF_CGROUP_STORAGE_SHARED,
488 BPF_CGROUP_STORAGE_PERCPU,
489 __BPF_CGROUP_STORAGE_MAX
492 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
494 /* The longest tracepoint has 12 args.
495 * See include/trace/bpf_probe.h
497 #define MAX_BPF_FUNC_ARGS 12
499 struct bpf_prog_stats {
502 struct u64_stats_sync syncp;
503 } __aligned(2 * sizeof(u64));
505 struct btf_func_model {
508 u8 arg_size[MAX_BPF_FUNC_ARGS];
511 /* Restore arguments before returning from trampoline to let original function
512 * continue executing. This flag is used for fentry progs when there are no
515 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
516 /* Call original function after fentry progs, but before fexit progs.
517 * Makes sense for fentry/fexit, normal calls and indirect calls.
519 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
520 /* Skip current frame and return to parent. Makes sense for fentry/fexit
521 * programs only. Should not be used with normal calls and indirect calls.
523 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
525 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
526 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
528 #define BPF_MAX_TRAMP_PROGS 40
530 struct bpf_tramp_progs {
531 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
535 /* Different use cases for BPF trampoline:
536 * 1. replace nop at the function entry (kprobe equivalent)
537 * flags = BPF_TRAMP_F_RESTORE_REGS
538 * fentry = a set of programs to run before returning from trampoline
540 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
541 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
542 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
543 * fentry = a set of program to run before calling original function
544 * fexit = a set of program to run after original function
546 * 3. replace direct call instruction anywhere in the function body
547 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
549 * fentry = a set of programs to run before returning from trampoline
550 * With flags = BPF_TRAMP_F_CALL_ORIG
551 * orig_call = original callback addr or direct function addr
552 * fentry = a set of program to run before calling original function
553 * fexit = a set of program to run after original function
555 int arch_prepare_bpf_trampoline(void *image, void *image_end,
556 const struct btf_func_model *m, u32 flags,
557 struct bpf_tramp_progs *tprogs,
559 /* these two functions are called from generated trampoline */
560 u64 notrace __bpf_prog_enter(void);
561 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
562 void notrace __bpf_prog_enter_sleepable(void);
563 void notrace __bpf_prog_exit_sleepable(void);
568 char name[KSYM_NAME_LEN];
569 struct list_head lnode;
570 struct latch_tree_node tnode;
574 enum bpf_tramp_prog_type {
577 BPF_TRAMP_MODIFY_RETURN,
579 BPF_TRAMP_REPLACE, /* more than MAX */
582 struct bpf_trampoline {
583 /* hlist for trampoline_table */
584 struct hlist_node hlist;
585 /* serializes access to fields of this trampoline */
590 struct btf_func_model model;
594 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
595 * program by replacing one of its functions. func.addr is the address
596 * of the function it replaced.
598 struct bpf_prog *extension_prog;
599 /* list of BPF programs using this trampoline */
600 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
601 /* Number of attached programs. A counter per kind. */
602 int progs_cnt[BPF_TRAMP_MAX];
603 /* Executable image of trampoline */
606 struct bpf_ksym ksym;
609 struct bpf_attach_target_info {
610 struct btf_func_model fmodel;
612 const char *tgt_name;
613 const struct btf_type *tgt_type;
616 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
618 struct bpf_dispatcher_prog {
619 struct bpf_prog *prog;
623 struct bpf_dispatcher {
624 /* dispatcher mutex */
627 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
631 struct bpf_ksym ksym;
634 static __always_inline unsigned int bpf_dispatcher_nop_func(
636 const struct bpf_insn *insnsi,
637 unsigned int (*bpf_func)(const void *,
638 const struct bpf_insn *))
640 return bpf_func(ctx, insnsi);
642 #ifdef CONFIG_BPF_JIT
643 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
644 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
645 struct bpf_trampoline *bpf_trampoline_get(u64 key,
646 struct bpf_attach_target_info *tgt_info);
647 void bpf_trampoline_put(struct bpf_trampoline *tr);
648 #define BPF_DISPATCHER_INIT(_name) { \
649 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
650 .func = &_name##_func, \
657 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
661 #define DEFINE_BPF_DISPATCHER(name) \
662 noinline unsigned int bpf_dispatcher_##name##_func( \
664 const struct bpf_insn *insnsi, \
665 unsigned int (*bpf_func)(const void *, \
666 const struct bpf_insn *)) \
668 return bpf_func(ctx, insnsi); \
670 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
671 struct bpf_dispatcher bpf_dispatcher_##name = \
672 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
673 #define DECLARE_BPF_DISPATCHER(name) \
674 unsigned int bpf_dispatcher_##name##_func( \
676 const struct bpf_insn *insnsi, \
677 unsigned int (*bpf_func)(const void *, \
678 const struct bpf_insn *)); \
679 extern struct bpf_dispatcher bpf_dispatcher_##name;
680 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
681 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
682 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
683 struct bpf_prog *to);
684 /* Called only from JIT-enabled code, so there's no need for stubs. */
685 void *bpf_jit_alloc_exec_page(void);
686 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
687 void bpf_image_ksym_del(struct bpf_ksym *ksym);
688 void bpf_ksym_add(struct bpf_ksym *ksym);
689 void bpf_ksym_del(struct bpf_ksym *ksym);
691 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
692 struct bpf_trampoline *tr)
696 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
697 struct bpf_trampoline *tr)
701 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
702 struct bpf_attach_target_info *tgt_info)
704 return ERR_PTR(-EOPNOTSUPP);
706 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
707 #define DEFINE_BPF_DISPATCHER(name)
708 #define DECLARE_BPF_DISPATCHER(name)
709 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
710 #define BPF_DISPATCHER_PTR(name) NULL
711 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
712 struct bpf_prog *from,
713 struct bpf_prog *to) {}
714 static inline bool is_bpf_image_address(unsigned long address)
720 struct bpf_func_info_aux {
725 enum bpf_jit_poke_reason {
726 BPF_POKE_REASON_TAIL_CALL,
729 /* Descriptor of pokes pointing /into/ the JITed image. */
730 struct bpf_jit_poke_descriptor {
731 void *tailcall_target;
732 void *tailcall_bypass;
740 bool tailcall_target_stable;
746 /* reg_type info for ctx arguments */
747 struct bpf_ctx_arg_aux {
749 enum bpf_reg_type reg_type;
753 struct bpf_prog_aux {
761 u32 func_cnt; /* used by non-func prog as the number of func progs */
762 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
763 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
764 u32 ctx_arg_info_size;
765 u32 max_rdonly_access;
767 const struct bpf_ctx_arg_aux *ctx_arg_info;
768 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
769 struct bpf_prog *dst_prog;
770 struct bpf_trampoline *dst_trampoline;
771 enum bpf_prog_type saved_dst_prog_type;
772 enum bpf_attach_type saved_dst_attach_type;
773 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
774 bool offload_requested;
775 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
776 bool func_proto_unreliable;
778 bool tail_call_reachable;
779 enum bpf_tramp_prog_type trampoline_prog_type;
780 struct hlist_node tramp_hlist;
781 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
782 const struct btf_type *attach_func_proto;
783 /* function name for valid attach_btf_id */
784 const char *attach_func_name;
785 struct bpf_prog **func;
786 void *jit_data; /* JIT specific data. arch dependent */
787 struct bpf_jit_poke_descriptor *poke_tab;
789 struct bpf_ksym ksym;
790 const struct bpf_prog_ops *ops;
791 struct bpf_map **used_maps;
792 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
793 struct bpf_prog *prog;
794 struct user_struct *user;
795 u64 load_time; /* ns since boottime */
796 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
797 char name[BPF_OBJ_NAME_LEN];
798 #ifdef CONFIG_SECURITY
801 struct bpf_prog_offload *offload;
803 struct bpf_func_info *func_info;
804 struct bpf_func_info_aux *func_info_aux;
805 /* bpf_line_info loaded from userspace. linfo->insn_off
806 * has the xlated insn offset.
807 * Both the main and sub prog share the same linfo.
808 * The subprog can access its first linfo by
809 * using the linfo_idx.
811 struct bpf_line_info *linfo;
812 /* jited_linfo is the jited addr of the linfo. It has a
813 * one to one mapping to linfo:
814 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
815 * Both the main and sub prog share the same jited_linfo.
816 * The subprog can access its first jited_linfo by
817 * using the linfo_idx.
822 /* subprog can use linfo_idx to access its first linfo and
824 * main prog always has linfo_idx == 0
828 struct exception_table_entry *extable;
829 struct bpf_prog_stats __percpu *stats;
831 struct work_struct work;
836 struct bpf_array_aux {
837 /* 'Ownership' of prog array is claimed by the first program that
838 * is going to use this map or by the first program which FD is
839 * stored in the map to make sure that all callers and callees have
840 * the same prog type and JITed flag.
842 enum bpf_prog_type type;
844 /* Programs with direct jumps into programs part of this array. */
845 struct list_head poke_progs;
847 struct mutex poke_mutex;
848 struct work_struct work;
854 enum bpf_link_type type;
855 const struct bpf_link_ops *ops;
856 struct bpf_prog *prog;
857 struct work_struct work;
860 struct bpf_link_ops {
861 void (*release)(struct bpf_link *link);
862 void (*dealloc)(struct bpf_link *link);
863 int (*detach)(struct bpf_link *link);
864 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
865 struct bpf_prog *old_prog);
866 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
867 int (*fill_link_info)(const struct bpf_link *link,
868 struct bpf_link_info *info);
871 struct bpf_link_primer {
872 struct bpf_link *link;
878 struct bpf_struct_ops_value;
882 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
883 struct bpf_struct_ops {
884 const struct bpf_verifier_ops *verifier_ops;
885 int (*init)(struct btf *btf);
886 int (*check_member)(const struct btf_type *t,
887 const struct btf_member *member);
888 int (*init_member)(const struct btf_type *t,
889 const struct btf_member *member,
890 void *kdata, const void *udata);
891 int (*reg)(void *kdata);
892 void (*unreg)(void *kdata);
893 const struct btf_type *type;
894 const struct btf_type *value_type;
896 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
901 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
902 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
903 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
904 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
905 bool bpf_struct_ops_get(const void *kdata);
906 void bpf_struct_ops_put(const void *kdata);
907 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
909 static inline bool bpf_try_module_get(const void *data, struct module *owner)
911 if (owner == BPF_MODULE_OWNER)
912 return bpf_struct_ops_get(data);
914 return try_module_get(owner);
916 static inline void bpf_module_put(const void *data, struct module *owner)
918 if (owner == BPF_MODULE_OWNER)
919 bpf_struct_ops_put(data);
924 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
928 static inline void bpf_struct_ops_init(struct btf *btf,
929 struct bpf_verifier_log *log)
932 static inline bool bpf_try_module_get(const void *data, struct module *owner)
934 return try_module_get(owner);
936 static inline void bpf_module_put(const void *data, struct module *owner)
940 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
952 struct bpf_array_aux *aux;
954 char value[0] __aligned(8);
955 void *ptrs[0] __aligned(8);
956 void __percpu *pptrs[0] __aligned(8);
960 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
961 #define MAX_TAIL_CALL_CNT 32
963 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
964 BPF_F_RDONLY_PROG | \
968 #define BPF_MAP_CAN_READ BIT(0)
969 #define BPF_MAP_CAN_WRITE BIT(1)
971 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
973 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
975 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
978 if (access_flags & BPF_F_RDONLY_PROG)
979 return BPF_MAP_CAN_READ;
980 else if (access_flags & BPF_F_WRONLY_PROG)
981 return BPF_MAP_CAN_WRITE;
983 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
986 static inline bool bpf_map_flags_access_ok(u32 access_flags)
988 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
989 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
992 struct bpf_event_entry {
993 struct perf_event *event;
994 struct file *perf_file;
995 struct file *map_file;
999 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
1000 int bpf_prog_calc_tag(struct bpf_prog *fp);
1001 const char *kernel_type_name(u32 btf_type_id);
1003 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1005 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1006 unsigned long off, unsigned long len);
1007 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1008 const struct bpf_insn *src,
1009 struct bpf_insn *dst,
1010 struct bpf_prog *prog,
1013 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1014 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1016 /* an array of programs to be executed under rcu_lock.
1019 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
1021 * the structure returned by bpf_prog_array_alloc() should be populated
1022 * with program pointers and the last pointer must be NULL.
1023 * The user has to keep refcnt on the program and make sure the program
1024 * is removed from the array before bpf_prog_put().
1025 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1026 * since other cpus are walking the array of pointers in parallel.
1028 struct bpf_prog_array_item {
1029 struct bpf_prog *prog;
1030 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1033 struct bpf_prog_array {
1034 struct rcu_head rcu;
1035 struct bpf_prog_array_item items[];
1038 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1039 void bpf_prog_array_free(struct bpf_prog_array *progs);
1040 int bpf_prog_array_length(struct bpf_prog_array *progs);
1041 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1042 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1043 __u32 __user *prog_ids, u32 cnt);
1045 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1046 struct bpf_prog *old_prog);
1047 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1048 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1049 struct bpf_prog *prog);
1050 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1051 u32 *prog_ids, u32 request_cnt,
1053 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1054 struct bpf_prog *exclude_prog,
1055 struct bpf_prog *include_prog,
1056 struct bpf_prog_array **new_array);
1058 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \
1060 struct bpf_prog_array_item *_item; \
1061 struct bpf_prog *_prog; \
1062 struct bpf_prog_array *_array; \
1064 migrate_disable(); \
1066 _array = rcu_dereference(array); \
1067 if (unlikely(check_non_null && !_array))\
1069 _item = &_array->items[0]; \
1070 while ((_prog = READ_ONCE(_item->prog))) { \
1071 bpf_cgroup_storage_set(_item->cgroup_storage); \
1072 _ret &= func(_prog, ctx); \
1076 rcu_read_unlock(); \
1081 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1082 * so BPF programs can request cwr for TCP packets.
1084 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1085 * packet. This macro changes the behavior so the low order bit
1086 * indicates whether the packet should be dropped (0) or not (1)
1087 * and the next bit is a congestion notification bit. This could be
1088 * used by TCP to call tcp_enter_cwr()
1090 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1093 * 2: drop packet and cn
1094 * 3: keep packet and cn
1096 * This macro then converts it to one of the NET_XMIT or an error
1097 * code that is then interpreted as drop packet (and no cn):
1098 * 0: NET_XMIT_SUCCESS skb should be transmitted
1099 * 1: NET_XMIT_DROP skb should be dropped and cn
1100 * 2: NET_XMIT_CN skb should be transmitted and cn
1101 * 3: -EPERM skb should be dropped
1103 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1105 struct bpf_prog_array_item *_item; \
1106 struct bpf_prog *_prog; \
1107 struct bpf_prog_array *_array; \
1111 migrate_disable(); \
1113 _array = rcu_dereference(array); \
1114 _item = &_array->items[0]; \
1115 while ((_prog = READ_ONCE(_item->prog))) { \
1116 bpf_cgroup_storage_set(_item->cgroup_storage); \
1117 ret = func(_prog, ctx); \
1118 _ret &= (ret & 1); \
1122 rcu_read_unlock(); \
1125 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1127 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1131 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \
1132 __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
1134 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
1135 __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
1137 #ifdef CONFIG_BPF_SYSCALL
1138 DECLARE_PER_CPU(int, bpf_prog_active);
1139 extern struct mutex bpf_stats_enabled_mutex;
1142 * Block execution of BPF programs attached to instrumentation (perf,
1143 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1144 * these events can happen inside a region which holds a map bucket lock
1145 * and can deadlock on it.
1147 * Use the preemption safe inc/dec variants on RT because migrate disable
1148 * is preemptible on RT and preemption in the middle of the RMW operation
1149 * might lead to inconsistent state. Use the raw variants for non RT
1150 * kernels as migrate_disable() maps to preempt_disable() so the slightly
1151 * more expensive save operation can be avoided.
1153 static inline void bpf_disable_instrumentation(void)
1156 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1157 this_cpu_inc(bpf_prog_active);
1159 __this_cpu_inc(bpf_prog_active);
1162 static inline void bpf_enable_instrumentation(void)
1164 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1165 this_cpu_dec(bpf_prog_active);
1167 __this_cpu_dec(bpf_prog_active);
1171 extern const struct file_operations bpf_map_fops;
1172 extern const struct file_operations bpf_prog_fops;
1173 extern const struct file_operations bpf_iter_fops;
1175 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1176 extern const struct bpf_prog_ops _name ## _prog_ops; \
1177 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1178 #define BPF_MAP_TYPE(_id, _ops) \
1179 extern const struct bpf_map_ops _ops;
1180 #define BPF_LINK_TYPE(_id, _name)
1181 #include <linux/bpf_types.h>
1182 #undef BPF_PROG_TYPE
1184 #undef BPF_LINK_TYPE
1186 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1187 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1188 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1190 struct bpf_prog *bpf_prog_get(u32 ufd);
1191 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1193 void bpf_prog_add(struct bpf_prog *prog, int i);
1194 void bpf_prog_sub(struct bpf_prog *prog, int i);
1195 void bpf_prog_inc(struct bpf_prog *prog);
1196 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1197 void bpf_prog_put(struct bpf_prog *prog);
1198 int __bpf_prog_charge(struct user_struct *user, u32 pages);
1199 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
1200 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1201 struct bpf_map **used_maps, u32 len);
1203 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1204 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1206 struct bpf_map *bpf_map_get(u32 ufd);
1207 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1208 struct bpf_map *__bpf_map_get(struct fd f);
1209 void bpf_map_inc(struct bpf_map *map);
1210 void bpf_map_inc_with_uref(struct bpf_map *map);
1211 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1212 void bpf_map_put_with_uref(struct bpf_map *map);
1213 void bpf_map_put(struct bpf_map *map);
1214 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
1215 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
1216 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
1217 void bpf_map_charge_finish(struct bpf_map_memory *mem);
1218 void bpf_map_charge_move(struct bpf_map_memory *dst,
1219 struct bpf_map_memory *src);
1220 void *bpf_map_area_alloc(u64 size, int numa_node);
1221 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1222 void bpf_map_area_free(void *base);
1223 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1224 int generic_map_lookup_batch(struct bpf_map *map,
1225 const union bpf_attr *attr,
1226 union bpf_attr __user *uattr);
1227 int generic_map_update_batch(struct bpf_map *map,
1228 const union bpf_attr *attr,
1229 union bpf_attr __user *uattr);
1230 int generic_map_delete_batch(struct bpf_map *map,
1231 const union bpf_attr *attr,
1232 union bpf_attr __user *uattr);
1233 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1234 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1236 extern int sysctl_unprivileged_bpf_disabled;
1238 static inline bool bpf_allow_ptr_leaks(void)
1240 return perfmon_capable();
1243 static inline bool bpf_allow_ptr_to_map_access(void)
1245 return perfmon_capable();
1248 static inline bool bpf_bypass_spec_v1(void)
1250 return perfmon_capable();
1253 static inline bool bpf_bypass_spec_v4(void)
1255 return perfmon_capable();
1258 int bpf_map_new_fd(struct bpf_map *map, int flags);
1259 int bpf_prog_new_fd(struct bpf_prog *prog);
1261 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1262 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1263 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1264 int bpf_link_settle(struct bpf_link_primer *primer);
1265 void bpf_link_cleanup(struct bpf_link_primer *primer);
1266 void bpf_link_inc(struct bpf_link *link);
1267 void bpf_link_put(struct bpf_link *link);
1268 int bpf_link_new_fd(struct bpf_link *link);
1269 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1270 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1272 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1273 int bpf_obj_get_user(const char __user *pathname, int flags);
1275 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1276 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1277 extern int bpf_iter_ ## target(args); \
1278 int __init bpf_iter_ ## target(args) { return 0; }
1280 struct bpf_iter_aux_info {
1281 struct bpf_map *map;
1284 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1285 union bpf_iter_link_info *linfo,
1286 struct bpf_iter_aux_info *aux);
1287 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1288 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1289 struct seq_file *seq);
1290 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1291 struct bpf_link_info *info);
1293 #define BPF_ITER_CTX_ARG_MAX 2
1294 struct bpf_iter_reg {
1296 bpf_iter_attach_target_t attach_target;
1297 bpf_iter_detach_target_t detach_target;
1298 bpf_iter_show_fdinfo_t show_fdinfo;
1299 bpf_iter_fill_link_info_t fill_link_info;
1300 u32 ctx_arg_info_size;
1301 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1302 const struct bpf_iter_seq_info *seq_info;
1305 struct bpf_iter_meta {
1306 __bpf_md_ptr(struct seq_file *, seq);
1311 struct bpf_iter__bpf_map_elem {
1312 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1313 __bpf_md_ptr(struct bpf_map *, map);
1314 __bpf_md_ptr(void *, key);
1315 __bpf_md_ptr(void *, value);
1318 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1319 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1320 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1321 int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
1322 int bpf_iter_new_fd(struct bpf_link *link);
1323 bool bpf_link_is_iter(struct bpf_link *link);
1324 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1325 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1326 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1327 struct seq_file *seq);
1328 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1329 struct bpf_link_info *info);
1331 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1332 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1333 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1335 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1338 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1340 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1341 void *key, void *value, u64 map_flags);
1342 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1343 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1344 void *key, void *value, u64 map_flags);
1345 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1347 int bpf_get_file_flag(int flags);
1348 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
1349 size_t actual_size);
1351 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1352 * forced to use 'long' read/writes to try to atomically copy long counters.
1353 * Best-effort only. No barriers here, since it _will_ race with concurrent
1354 * updates from BPF programs. Called from bpf syscall and mostly used with
1355 * size 8 or 16 bytes, so ask compiler to inline it.
1357 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1359 const long *lsrc = src;
1362 size /= sizeof(long);
1367 /* verify correctness of eBPF program */
1368 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
1369 union bpf_attr __user *uattr);
1370 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1372 struct btf *bpf_get_btf_vmlinux(void);
1378 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
1379 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
1380 void __dev_flush(void);
1381 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1382 struct net_device *dev_rx);
1383 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1384 struct net_device *dev_rx);
1385 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1386 struct bpf_prog *xdp_prog);
1387 bool dev_map_can_have_prog(struct bpf_map *map);
1389 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
1390 void __cpu_map_flush(void);
1391 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1392 struct net_device *dev_rx);
1393 bool cpu_map_prog_allowed(struct bpf_map *map);
1395 /* Return map's numa specified by userspace */
1396 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1398 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1399 attr->numa_node : NUMA_NO_NODE;
1402 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1403 int array_map_alloc_check(union bpf_attr *attr);
1405 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1406 union bpf_attr __user *uattr);
1407 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1408 union bpf_attr __user *uattr);
1409 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1410 const union bpf_attr *kattr,
1411 union bpf_attr __user *uattr);
1412 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1413 const union bpf_attr *kattr,
1414 union bpf_attr __user *uattr);
1415 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1416 const union bpf_attr *kattr,
1417 union bpf_attr __user *uattr);
1418 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1419 const struct bpf_prog *prog,
1420 struct bpf_insn_access_aux *info);
1421 int btf_struct_access(struct bpf_verifier_log *log,
1422 const struct btf_type *t, int off, int size,
1423 enum bpf_access_type atype,
1425 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1426 int off, u32 id, u32 need_type_id);
1428 int btf_distill_func_proto(struct bpf_verifier_log *log,
1430 const struct btf_type *func_proto,
1431 const char *func_name,
1432 struct btf_func_model *m);
1434 struct bpf_reg_state;
1435 int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
1436 struct bpf_reg_state *regs);
1437 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1438 struct bpf_reg_state *reg);
1439 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1440 struct btf *btf, const struct btf_type *t);
1442 struct bpf_prog *bpf_prog_by_id(u32 id);
1443 struct bpf_link *bpf_link_by_id(u32 id);
1445 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1446 #else /* !CONFIG_BPF_SYSCALL */
1447 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1449 return ERR_PTR(-EOPNOTSUPP);
1452 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1453 enum bpf_prog_type type,
1456 return ERR_PTR(-EOPNOTSUPP);
1459 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1463 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1467 static inline void bpf_prog_put(struct bpf_prog *prog)
1471 static inline void bpf_prog_inc(struct bpf_prog *prog)
1475 static inline struct bpf_prog *__must_check
1476 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1478 return ERR_PTR(-EOPNOTSUPP);
1481 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
1486 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1490 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1491 const struct bpf_link_ops *ops,
1492 struct bpf_prog *prog)
1496 static inline int bpf_link_prime(struct bpf_link *link,
1497 struct bpf_link_primer *primer)
1502 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1507 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1511 static inline void bpf_link_inc(struct bpf_link *link)
1515 static inline void bpf_link_put(struct bpf_link *link)
1519 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1524 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map,
1530 static inline struct net_device *__dev_map_hash_lookup_elem(struct bpf_map *map,
1535 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1540 static inline void __dev_flush(void)
1545 struct bpf_dtab_netdev;
1548 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1549 struct net_device *dev_rx)
1555 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1556 struct net_device *dev_rx)
1563 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1564 struct sk_buff *skb,
1565 struct bpf_prog *xdp_prog)
1571 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
1576 static inline void __cpu_map_flush(void)
1580 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1581 struct xdp_buff *xdp,
1582 struct net_device *dev_rx)
1587 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1592 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1593 enum bpf_prog_type type)
1595 return ERR_PTR(-EOPNOTSUPP);
1598 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1599 const union bpf_attr *kattr,
1600 union bpf_attr __user *uattr)
1605 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1606 const union bpf_attr *kattr,
1607 union bpf_attr __user *uattr)
1612 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1613 const union bpf_attr *kattr,
1614 union bpf_attr __user *uattr)
1619 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1620 const union bpf_attr *kattr,
1621 union bpf_attr __user *uattr)
1626 static inline void bpf_map_put(struct bpf_map *map)
1630 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1632 return ERR_PTR(-ENOTSUPP);
1635 static inline const struct bpf_func_proto *
1636 bpf_base_func_proto(enum bpf_func_id func_id)
1640 #endif /* CONFIG_BPF_SYSCALL */
1642 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1643 enum bpf_prog_type type)
1645 return bpf_prog_get_type_dev(ufd, type, false);
1648 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1650 int bpf_prog_offload_compile(struct bpf_prog *prog);
1651 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1652 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1653 struct bpf_prog *prog);
1655 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1657 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1658 int bpf_map_offload_update_elem(struct bpf_map *map,
1659 void *key, void *value, u64 flags);
1660 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1661 int bpf_map_offload_get_next_key(struct bpf_map *map,
1662 void *key, void *next_key);
1664 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1666 struct bpf_offload_dev *
1667 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1668 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1669 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1670 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1671 struct net_device *netdev);
1672 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1673 struct net_device *netdev);
1674 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
1676 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
1677 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
1679 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
1681 return aux->offload_requested;
1684 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1686 return unlikely(map->ops == &bpf_map_offload_ops);
1689 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
1690 void bpf_map_offload_map_free(struct bpf_map *map);
1692 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
1693 union bpf_attr *attr)
1698 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
1703 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
1708 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
1710 return ERR_PTR(-EOPNOTSUPP);
1713 static inline void bpf_map_offload_map_free(struct bpf_map *map)
1716 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
1718 #if defined(CONFIG_BPF_STREAM_PARSER)
1719 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog,
1720 struct bpf_prog *old, u32 which);
1721 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
1722 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
1723 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
1724 void sock_map_unhash(struct sock *sk);
1725 void sock_map_close(struct sock *sk, long timeout);
1727 static inline int sock_map_prog_update(struct bpf_map *map,
1728 struct bpf_prog *prog,
1729 struct bpf_prog *old, u32 which)
1734 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
1735 struct bpf_prog *prog)
1740 static inline int sock_map_prog_detach(const union bpf_attr *attr,
1741 enum bpf_prog_type ptype)
1746 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
1751 #endif /* CONFIG_BPF_STREAM_PARSER */
1753 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
1754 void bpf_sk_reuseport_detach(struct sock *sk);
1755 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
1757 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
1758 void *value, u64 map_flags);
1760 static inline void bpf_sk_reuseport_detach(struct sock *sk)
1764 #ifdef CONFIG_BPF_SYSCALL
1765 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
1766 void *key, void *value)
1771 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
1772 void *key, void *value,
1777 #endif /* CONFIG_BPF_SYSCALL */
1778 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
1780 /* verifier prototypes for helper functions called from eBPF programs */
1781 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
1782 extern const struct bpf_func_proto bpf_map_update_elem_proto;
1783 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
1784 extern const struct bpf_func_proto bpf_map_push_elem_proto;
1785 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
1786 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
1788 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
1789 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
1790 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
1791 extern const struct bpf_func_proto bpf_tail_call_proto;
1792 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
1793 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
1794 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
1795 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
1796 extern const struct bpf_func_proto bpf_get_current_comm_proto;
1797 extern const struct bpf_func_proto bpf_get_stackid_proto;
1798 extern const struct bpf_func_proto bpf_get_stack_proto;
1799 extern const struct bpf_func_proto bpf_get_task_stack_proto;
1800 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
1801 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
1802 extern const struct bpf_func_proto bpf_sock_map_update_proto;
1803 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
1804 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
1805 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
1806 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
1807 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
1808 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
1809 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
1810 extern const struct bpf_func_proto bpf_spin_lock_proto;
1811 extern const struct bpf_func_proto bpf_spin_unlock_proto;
1812 extern const struct bpf_func_proto bpf_get_local_storage_proto;
1813 extern const struct bpf_func_proto bpf_strtol_proto;
1814 extern const struct bpf_func_proto bpf_strtoul_proto;
1815 extern const struct bpf_func_proto bpf_tcp_sock_proto;
1816 extern const struct bpf_func_proto bpf_jiffies64_proto;
1817 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
1818 extern const struct bpf_func_proto bpf_event_output_data_proto;
1819 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
1820 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
1821 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
1822 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
1823 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
1824 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
1825 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
1826 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
1827 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
1828 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
1829 extern const struct bpf_func_proto bpf_copy_from_user_proto;
1830 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
1832 const struct bpf_func_proto *bpf_tracing_func_proto(
1833 enum bpf_func_id func_id, const struct bpf_prog *prog);
1835 const struct bpf_func_proto *tracing_prog_func_proto(
1836 enum bpf_func_id func_id, const struct bpf_prog *prog);
1838 /* Shared helpers among cBPF and eBPF. */
1839 void bpf_user_rnd_init_once(void);
1840 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1841 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1843 #if defined(CONFIG_NET)
1844 bool bpf_sock_common_is_valid_access(int off, int size,
1845 enum bpf_access_type type,
1846 struct bpf_insn_access_aux *info);
1847 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1848 struct bpf_insn_access_aux *info);
1849 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1850 const struct bpf_insn *si,
1851 struct bpf_insn *insn_buf,
1852 struct bpf_prog *prog,
1855 static inline bool bpf_sock_common_is_valid_access(int off, int size,
1856 enum bpf_access_type type,
1857 struct bpf_insn_access_aux *info)
1861 static inline bool bpf_sock_is_valid_access(int off, int size,
1862 enum bpf_access_type type,
1863 struct bpf_insn_access_aux *info)
1867 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1868 const struct bpf_insn *si,
1869 struct bpf_insn *insn_buf,
1870 struct bpf_prog *prog,
1878 struct sk_reuseport_kern {
1879 struct sk_buff *skb;
1881 struct sock *selected_sk;
1887 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1888 struct bpf_insn_access_aux *info);
1890 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1891 const struct bpf_insn *si,
1892 struct bpf_insn *insn_buf,
1893 struct bpf_prog *prog,
1896 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1897 struct bpf_insn_access_aux *info);
1899 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1900 const struct bpf_insn *si,
1901 struct bpf_insn *insn_buf,
1902 struct bpf_prog *prog,
1905 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
1906 enum bpf_access_type type,
1907 struct bpf_insn_access_aux *info)
1912 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1913 const struct bpf_insn *si,
1914 struct bpf_insn *insn_buf,
1915 struct bpf_prog *prog,
1920 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
1921 enum bpf_access_type type,
1922 struct bpf_insn_access_aux *info)
1927 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1928 const struct bpf_insn *si,
1929 struct bpf_insn *insn_buf,
1930 struct bpf_prog *prog,
1935 #endif /* CONFIG_INET */
1937 enum bpf_text_poke_type {
1942 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
1943 void *addr1, void *addr2);
1946 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
1948 #endif /* _LINUX_BPF_H */