1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
7 #include <uapi/linux/bpf.h>
8 #include <uapi/linux/filter.h>
10 #include <linux/workqueue.h>
11 #include <linux/file.h>
12 #include <linux/percpu.h>
13 #include <linux/err.h>
14 #include <linux/rbtree_latch.h>
15 #include <linux/numa.h>
16 #include <linux/mm_types.h>
17 #include <linux/wait.h>
18 #include <linux/refcount.h>
19 #include <linux/mutex.h>
20 #include <linux/module.h>
21 #include <linux/kallsyms.h>
22 #include <linux/capability.h>
23 #include <linux/sched/mm.h>
24 #include <linux/slab.h>
25 #include <linux/percpu-refcount.h>
26 #include <linux/stddef.h>
27 #include <linux/bpfptr.h>
28 #include <linux/btf.h>
29 #include <linux/rcupdate_trace.h>
30 #include <linux/static_call.h>
31 #include <linux/memcontrol.h>
33 struct bpf_verifier_env;
34 struct bpf_verifier_log;
43 struct exception_table_entry;
44 struct seq_operations;
45 struct bpf_iter_aux_info;
46 struct bpf_local_storage;
47 struct bpf_local_storage_map;
51 struct bpf_func_state;
55 extern struct idr btf_idr;
56 extern spinlock_t btf_idr_lock;
57 extern struct kobject *btf_kobj;
58 extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
59 extern bool bpf_global_ma_set, bpf_global_percpu_ma_set;
61 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
62 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
63 struct bpf_iter_aux_info *aux);
64 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
65 typedef unsigned int (*bpf_func_t)(const void *,
66 const struct bpf_insn *);
67 struct bpf_iter_seq_info {
68 const struct seq_operations *seq_ops;
69 bpf_iter_init_seq_priv_t init_seq_private;
70 bpf_iter_fini_seq_priv_t fini_seq_private;
74 /* map is generic key/value storage optionally accessible by eBPF programs */
76 /* funcs callable from userspace (via syscall) */
77 int (*map_alloc_check)(union bpf_attr *attr);
78 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
79 void (*map_release)(struct bpf_map *map, struct file *map_file);
80 void (*map_free)(struct bpf_map *map);
81 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
82 void (*map_release_uref)(struct bpf_map *map);
83 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
84 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
85 union bpf_attr __user *uattr);
86 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
87 void *value, u64 flags);
88 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
89 const union bpf_attr *attr,
90 union bpf_attr __user *uattr);
91 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
92 const union bpf_attr *attr,
93 union bpf_attr __user *uattr);
94 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
95 union bpf_attr __user *uattr);
97 /* funcs callable from userspace and from eBPF programs */
98 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
99 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
100 long (*map_delete_elem)(struct bpf_map *map, void *key);
101 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
102 long (*map_pop_elem)(struct bpf_map *map, void *value);
103 long (*map_peek_elem)(struct bpf_map *map, void *value);
104 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
106 /* funcs called by prog_array and perf_event_array map */
107 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
109 void (*map_fd_put_ptr)(void *ptr);
110 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
111 u32 (*map_fd_sys_lookup_elem)(void *ptr);
112 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
114 int (*map_check_btf)(const struct bpf_map *map,
115 const struct btf *btf,
116 const struct btf_type *key_type,
117 const struct btf_type *value_type);
119 /* Prog poke tracking helpers. */
120 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
121 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
122 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
123 struct bpf_prog *new);
125 /* Direct value access helpers. */
126 int (*map_direct_value_addr)(const struct bpf_map *map,
128 int (*map_direct_value_meta)(const struct bpf_map *map,
130 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
131 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
132 struct poll_table_struct *pts);
134 /* Functions called by bpf_local_storage maps */
135 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
136 void *owner, u32 size);
137 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
138 void *owner, u32 size);
139 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
142 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
144 /* map_meta_equal must be implemented for maps that can be
145 * used as an inner map. It is a runtime check to ensure
146 * an inner map can be inserted to an outer map.
148 * Some properties of the inner map has been used during the
149 * verification time. When inserting an inner map at the runtime,
150 * map_meta_equal has to ensure the inserting map has the same
151 * properties that the verifier has used earlier.
153 bool (*map_meta_equal)(const struct bpf_map *meta0,
154 const struct bpf_map *meta1);
157 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
158 struct bpf_func_state *caller,
159 struct bpf_func_state *callee);
160 long (*map_for_each_callback)(struct bpf_map *map,
161 bpf_callback_t callback_fn,
162 void *callback_ctx, u64 flags);
164 u64 (*map_mem_usage)(const struct bpf_map *map);
166 /* BTF id of struct allocated by map_alloc */
169 /* bpf_iter info used to open a seq_file */
170 const struct bpf_iter_seq_info *iter_seq_info;
174 /* Support at most 10 fields in a BTF type */
178 enum btf_field_type {
179 BPF_SPIN_LOCK = (1 << 0),
180 BPF_TIMER = (1 << 1),
181 BPF_KPTR_UNREF = (1 << 2),
182 BPF_KPTR_REF = (1 << 3),
183 BPF_KPTR_PERCPU = (1 << 4),
184 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,
185 BPF_LIST_HEAD = (1 << 5),
186 BPF_LIST_NODE = (1 << 6),
187 BPF_RB_ROOT = (1 << 7),
188 BPF_RB_NODE = (1 << 8),
189 BPF_GRAPH_NODE_OR_ROOT = BPF_LIST_NODE | BPF_LIST_HEAD |
190 BPF_RB_NODE | BPF_RB_ROOT,
191 BPF_REFCOUNT = (1 << 9),
194 typedef void (*btf_dtor_kfunc_t)(void *);
196 struct btf_field_kptr {
198 struct module *module;
199 /* dtor used if btf_is_kernel(btf), otherwise the type is
200 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
202 btf_dtor_kfunc_t dtor;
206 struct btf_field_graph_root {
210 struct btf_record *value_rec;
216 enum btf_field_type type;
218 struct btf_field_kptr kptr;
219 struct btf_field_graph_root graph_root;
229 struct btf_field fields[];
232 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
233 struct bpf_rb_node_kern {
234 struct rb_node rb_node;
236 } __attribute__((aligned(8)));
238 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
239 struct bpf_list_node_kern {
240 struct list_head list_head;
242 } __attribute__((aligned(8)));
245 /* The first two cachelines with read-mostly members of which some
246 * are also accessed in fast-path (e.g. ops, max_entries).
248 const struct bpf_map_ops *ops ____cacheline_aligned;
249 struct bpf_map *inner_map_meta;
250 #ifdef CONFIG_SECURITY
253 enum bpf_map_type map_type;
257 u64 map_extra; /* any per-map-type extra fields */
260 struct btf_record *record;
263 u32 btf_value_type_id;
264 u32 btf_vmlinux_value_type_id;
266 #ifdef CONFIG_MEMCG_KMEM
267 struct obj_cgroup *objcg;
269 char name[BPF_OBJ_NAME_LEN];
270 /* The 3rd and 4th cacheline with misc members to avoid false sharing
271 * particularly with refcounting.
273 atomic64_t refcnt ____cacheline_aligned;
275 struct work_struct work;
276 struct mutex freeze_mutex;
278 /* 'Ownership' of program-containing map is claimed by the first program
279 * that is going to use this map or by the first program which FD is
280 * stored in the map to make sure that all callers and callees have the
281 * same prog type, JITed flag and xdp_has_frags flag.
285 enum bpf_prog_type type;
290 bool frozen; /* write-once; write-protected by freeze_mutex */
291 s64 __percpu *elem_count;
294 static inline const char *btf_field_type_name(enum btf_field_type type)
298 return "bpf_spin_lock";
304 case BPF_KPTR_PERCPU:
305 return "percpu_kptr";
307 return "bpf_list_head";
309 return "bpf_list_node";
311 return "bpf_rb_root";
313 return "bpf_rb_node";
315 return "bpf_refcount";
322 static inline u32 btf_field_type_size(enum btf_field_type type)
326 return sizeof(struct bpf_spin_lock);
328 return sizeof(struct bpf_timer);
331 case BPF_KPTR_PERCPU:
334 return sizeof(struct bpf_list_head);
336 return sizeof(struct bpf_list_node);
338 return sizeof(struct bpf_rb_root);
340 return sizeof(struct bpf_rb_node);
342 return sizeof(struct bpf_refcount);
349 static inline u32 btf_field_type_align(enum btf_field_type type)
353 return __alignof__(struct bpf_spin_lock);
355 return __alignof__(struct bpf_timer);
358 case BPF_KPTR_PERCPU:
359 return __alignof__(u64);
361 return __alignof__(struct bpf_list_head);
363 return __alignof__(struct bpf_list_node);
365 return __alignof__(struct bpf_rb_root);
367 return __alignof__(struct bpf_rb_node);
369 return __alignof__(struct bpf_refcount);
376 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
378 memset(addr, 0, field->size);
380 switch (field->type) {
382 refcount_set((refcount_t *)addr, 1);
385 RB_CLEAR_NODE((struct rb_node *)addr);
389 INIT_LIST_HEAD((struct list_head *)addr);
392 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
397 case BPF_KPTR_PERCPU:
405 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
407 if (IS_ERR_OR_NULL(rec))
409 return rec->field_mask & type;
412 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
416 if (IS_ERR_OR_NULL(rec))
418 for (i = 0; i < rec->cnt; i++)
419 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
422 /* 'dst' must be a temporary buffer and should not point to memory that is being
423 * used in parallel by a bpf program or bpf syscall, otherwise the access from
424 * the bpf program or bpf syscall may be corrupted by the reinitialization,
425 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
426 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
427 * program or bpf syscall.
429 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
431 bpf_obj_init(map->record, dst);
434 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
435 * forced to use 'long' read/writes to try to atomically copy long counters.
436 * Best-effort only. No barriers here, since it _will_ race with concurrent
437 * updates from BPF programs. Called from bpf syscall and mostly used with
438 * size 8 or 16 bytes, so ask compiler to inline it.
440 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
442 const long *lsrc = src;
445 size /= sizeof(long);
447 data_race(*ldst++ = *lsrc++);
450 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
451 static inline void bpf_obj_memcpy(struct btf_record *rec,
452 void *dst, void *src, u32 size,
458 if (IS_ERR_OR_NULL(rec)) {
460 bpf_long_memcpy(dst, src, round_up(size, 8));
462 memcpy(dst, src, size);
466 for (i = 0; i < rec->cnt; i++) {
467 u32 next_off = rec->fields[i].offset;
468 u32 sz = next_off - curr_off;
470 memcpy(dst + curr_off, src + curr_off, sz);
471 curr_off += rec->fields[i].size + sz;
473 memcpy(dst + curr_off, src + curr_off, size - curr_off);
476 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
478 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
481 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
483 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
486 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
491 if (IS_ERR_OR_NULL(rec)) {
492 memset(dst, 0, size);
496 for (i = 0; i < rec->cnt; i++) {
497 u32 next_off = rec->fields[i].offset;
498 u32 sz = next_off - curr_off;
500 memset(dst + curr_off, 0, sz);
501 curr_off += rec->fields[i].size + sz;
503 memset(dst + curr_off, 0, size - curr_off);
506 static inline void zero_map_value(struct bpf_map *map, void *dst)
508 bpf_obj_memzero(map->record, dst, map->value_size);
511 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
513 void bpf_timer_cancel_and_free(void *timer);
514 void bpf_list_head_free(const struct btf_field *field, void *list_head,
515 struct bpf_spin_lock *spin_lock);
516 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
517 struct bpf_spin_lock *spin_lock);
520 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
522 struct bpf_offload_dev;
523 struct bpf_offloaded_map;
525 struct bpf_map_dev_ops {
526 int (*map_get_next_key)(struct bpf_offloaded_map *map,
527 void *key, void *next_key);
528 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
529 void *key, void *value);
530 int (*map_update_elem)(struct bpf_offloaded_map *map,
531 void *key, void *value, u64 flags);
532 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
535 struct bpf_offloaded_map {
537 struct net_device *netdev;
538 const struct bpf_map_dev_ops *dev_ops;
540 struct list_head offloads;
543 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
545 return container_of(map, struct bpf_offloaded_map, map);
548 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
550 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
553 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
555 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
556 map->ops->map_seq_show_elem;
559 int map_check_no_btf(const struct bpf_map *map,
560 const struct btf *btf,
561 const struct btf_type *key_type,
562 const struct btf_type *value_type);
564 bool bpf_map_meta_equal(const struct bpf_map *meta0,
565 const struct bpf_map *meta1);
567 extern const struct bpf_map_ops bpf_map_offload_ops;
569 /* bpf_type_flag contains a set of flags that are applicable to the values of
570 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
571 * or a memory is read-only. We classify types into two categories: base types
572 * and extended types. Extended types are base types combined with a type flag.
574 * Currently there are no more than 32 base types in arg_type, ret_type and
577 #define BPF_BASE_TYPE_BITS 8
580 /* PTR may be NULL. */
581 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
583 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
584 * compatible with both mutable and immutable memory.
586 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
588 /* MEM points to BPF ring buffer reservation. */
589 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
591 /* MEM is in user address space. */
592 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
594 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
595 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
596 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
597 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
598 * to the specified cpu.
600 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
602 /* Indicates that the argument will be released. */
603 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
605 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
606 * unreferenced and referenced kptr loaded from map value using a load
607 * instruction, so that they can only be dereferenced but not escape the
608 * BPF program into the kernel (i.e. cannot be passed as arguments to
609 * kfunc or bpf helpers).
611 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
613 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
615 /* DYNPTR points to memory local to the bpf program. */
616 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
618 /* DYNPTR points to a kernel-produced ringbuf record. */
619 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
621 /* Size is known at compile time. */
622 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
624 /* MEM is of an allocated object of type in program BTF. This is used to
625 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
627 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
629 /* PTR was passed from the kernel in a trusted context, and may be
630 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
631 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
632 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
633 * without invoking bpf_kptr_xchg(). What we really need to know is
634 * whether a pointer is safe to pass to a kfunc or BPF helper function.
635 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
636 * helpers, they do not cover all possible instances of unsafe
637 * pointers. For example, a pointer that was obtained from walking a
638 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
639 * fact that it may be NULL, invalid, etc. This is due to backwards
640 * compatibility requirements, as this was the behavior that was first
641 * introduced when kptrs were added. The behavior is now considered
642 * deprecated, and PTR_UNTRUSTED will eventually be removed.
644 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
645 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
646 * For example, pointers passed to tracepoint arguments are considered
647 * PTR_TRUSTED, as are pointers that are passed to struct_ops
648 * callbacks. As alluded to above, pointers that are obtained from
649 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
650 * struct task_struct *task is PTR_TRUSTED, then accessing
651 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
652 * in a BPF register. Similarly, pointers passed to certain programs
653 * types such as kretprobes are not guaranteed to be valid, as they may
654 * for example contain an object that was recently freed.
656 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
658 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
659 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
661 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
662 * Currently only valid for linked-list and rbtree nodes. If the nodes
663 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
665 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
667 /* DYNPTR points to sk_buff */
668 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
670 /* DYNPTR points to xdp_buff */
671 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
674 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
677 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
680 /* Max number of base types. */
681 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
683 /* Max number of all types. */
684 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
686 /* function argument constraints */
688 ARG_DONTCARE = 0, /* unused argument in helper function */
690 /* the following constraints used to prototype
691 * bpf_map_lookup/update/delete_elem() functions
693 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
694 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
695 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
697 /* Used to prototype bpf_memcmp() and other functions that access data
698 * on eBPF program stack
700 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
702 ARG_CONST_SIZE, /* number of bytes accessed from memory */
703 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
705 ARG_PTR_TO_CTX, /* pointer to context */
706 ARG_ANYTHING, /* any (initialized) argument is ok */
707 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
708 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
709 ARG_PTR_TO_INT, /* pointer to int */
710 ARG_PTR_TO_LONG, /* pointer to long */
711 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
712 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
713 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
714 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
715 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
716 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
717 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
718 ARG_PTR_TO_STACK, /* pointer to stack */
719 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
720 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
721 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */
722 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
725 /* Extended arg_types. */
726 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
727 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
728 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
729 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
730 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
731 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
732 /* pointer to memory does not need to be initialized, helper function must fill
733 * all bytes or clear them in error case.
735 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM,
736 /* Pointer to valid memory of size known at compile time. */
737 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
739 /* This must be the last entry. Its purpose is to ensure the enum is
740 * wide enough to hold the higher bits reserved for bpf_type_flag.
742 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
744 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
746 /* type of values returned from helper functions */
747 enum bpf_return_type {
748 RET_INTEGER, /* function returns integer */
749 RET_VOID, /* function doesn't return anything */
750 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
751 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
752 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
753 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
754 RET_PTR_TO_MEM, /* returns a pointer to memory */
755 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
756 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
759 /* Extended ret_types. */
760 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
761 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
762 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
763 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
764 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
765 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
766 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
767 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
769 /* This must be the last entry. Its purpose is to ensure the enum is
770 * wide enough to hold the higher bits reserved for bpf_type_flag.
772 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
774 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
776 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
777 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
778 * instructions after verifying
780 struct bpf_func_proto {
781 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
785 enum bpf_return_type ret_type;
788 enum bpf_arg_type arg1_type;
789 enum bpf_arg_type arg2_type;
790 enum bpf_arg_type arg3_type;
791 enum bpf_arg_type arg4_type;
792 enum bpf_arg_type arg5_type;
794 enum bpf_arg_type arg_type[5];
814 int *ret_btf_id; /* return value btf_id */
815 bool (*allowed)(const struct bpf_prog *prog);
818 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
819 * the first argument to eBPF programs.
820 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
824 enum bpf_access_type {
829 /* types of values stored in eBPF registers */
830 /* Pointer types represent:
833 * pointer + (u16) var
834 * pointer + (u16) var + imm
835 * if (range > 0) then [ptr, ptr + range - off) is safe to access
836 * if (id > 0) means that some 'var' was added
837 * if (off > 0) means that 'imm' was added
840 NOT_INIT = 0, /* nothing was written into register */
841 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
842 PTR_TO_CTX, /* reg points to bpf_context */
843 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
844 PTR_TO_MAP_VALUE, /* reg points to map element value */
845 PTR_TO_MAP_KEY, /* reg points to a map element key */
846 PTR_TO_STACK, /* reg == frame_pointer + offset */
847 PTR_TO_PACKET_META, /* skb->data - meta_len */
848 PTR_TO_PACKET, /* reg points to skb->data */
849 PTR_TO_PACKET_END, /* skb->data + headlen */
850 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
851 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
852 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
853 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
854 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
855 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
856 /* PTR_TO_BTF_ID points to a kernel struct that does not need
857 * to be null checked by the BPF program. This does not imply the
858 * pointer is _not_ null and in practice this can easily be a null
859 * pointer when reading pointer chains. The assumption is program
860 * context will handle null pointer dereference typically via fault
861 * handling. The verifier must keep this in mind and can make no
862 * assumptions about null or non-null when doing branch analysis.
863 * Further, when passed into helpers the helpers can not, without
864 * additional context, assume the value is non-null.
867 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
868 * been checked for null. Used primarily to inform the verifier
869 * an explicit null check is required for this struct.
871 PTR_TO_MEM, /* reg points to valid memory region */
872 PTR_TO_BUF, /* reg points to a read/write buffer */
873 PTR_TO_FUNC, /* reg points to a bpf program function */
874 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
877 /* Extended reg_types. */
878 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
879 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
880 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
881 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
882 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
884 /* This must be the last entry. Its purpose is to ensure the enum is
885 * wide enough to hold the higher bits reserved for bpf_type_flag.
887 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
889 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
891 /* The information passed from prog-specific *_is_valid_access
892 * back to the verifier.
894 struct bpf_insn_access_aux {
895 enum bpf_reg_type reg_type;
903 struct bpf_verifier_log *log; /* for verbose logs */
907 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
909 aux->ctx_field_size = size;
912 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
914 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
915 insn->src_reg == BPF_PSEUDO_FUNC;
918 struct bpf_prog_ops {
919 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
920 union bpf_attr __user *uattr);
923 struct bpf_reg_state;
924 struct bpf_verifier_ops {
925 /* return eBPF function prototype for verification */
926 const struct bpf_func_proto *
927 (*get_func_proto)(enum bpf_func_id func_id,
928 const struct bpf_prog *prog);
930 /* return true if 'size' wide access at offset 'off' within bpf_context
931 * with 'type' (read or write) is allowed
933 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
934 const struct bpf_prog *prog,
935 struct bpf_insn_access_aux *info);
936 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
937 const struct bpf_prog *prog);
938 int (*gen_ld_abs)(const struct bpf_insn *orig,
939 struct bpf_insn *insn_buf);
940 u32 (*convert_ctx_access)(enum bpf_access_type type,
941 const struct bpf_insn *src,
942 struct bpf_insn *dst,
943 struct bpf_prog *prog, u32 *target_size);
944 int (*btf_struct_access)(struct bpf_verifier_log *log,
945 const struct bpf_reg_state *reg,
949 struct bpf_prog_offload_ops {
950 /* verifier basic callbacks */
951 int (*insn_hook)(struct bpf_verifier_env *env,
952 int insn_idx, int prev_insn_idx);
953 int (*finalize)(struct bpf_verifier_env *env);
954 /* verifier optimization callbacks (called after .finalize) */
955 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
956 struct bpf_insn *insn);
957 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
958 /* program management callbacks */
959 int (*prepare)(struct bpf_prog *prog);
960 int (*translate)(struct bpf_prog *prog);
961 void (*destroy)(struct bpf_prog *prog);
964 struct bpf_prog_offload {
965 struct bpf_prog *prog;
966 struct net_device *netdev;
967 struct bpf_offload_dev *offdev;
969 struct list_head offloads;
976 enum bpf_cgroup_storage_type {
977 BPF_CGROUP_STORAGE_SHARED,
978 BPF_CGROUP_STORAGE_PERCPU,
979 __BPF_CGROUP_STORAGE_MAX
982 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
984 /* The longest tracepoint has 12 args.
985 * See include/trace/bpf_probe.h
987 #define MAX_BPF_FUNC_ARGS 12
989 /* The maximum number of arguments passed through registers
990 * a single function may have.
992 #define MAX_BPF_FUNC_REG_ARGS 5
994 /* The argument is a structure. */
995 #define BTF_FMODEL_STRUCT_ARG BIT(0)
997 /* The argument is signed. */
998 #define BTF_FMODEL_SIGNED_ARG BIT(1)
1000 struct btf_func_model {
1004 u8 arg_size[MAX_BPF_FUNC_ARGS];
1005 u8 arg_flags[MAX_BPF_FUNC_ARGS];
1008 /* Restore arguments before returning from trampoline to let original function
1009 * continue executing. This flag is used for fentry progs when there are no
1012 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1013 /* Call original function after fentry progs, but before fexit progs.
1014 * Makes sense for fentry/fexit, normal calls and indirect calls.
1016 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
1017 /* Skip current frame and return to parent. Makes sense for fentry/fexit
1018 * programs only. Should not be used with normal calls and indirect calls.
1020 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1021 /* Store IP address of the caller on the trampoline stack,
1022 * so it's available for trampoline's programs.
1024 #define BPF_TRAMP_F_IP_ARG BIT(3)
1025 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1026 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1028 /* Get original function from stack instead of from provided direct address.
1029 * Makes sense for trampolines with fexit or fmod_ret programs.
1031 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
1033 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1034 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1036 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1038 /* Indicate that current trampoline is in a tail call context. Then, it has to
1039 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1041 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1043 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1047 #if defined(__s390x__)
1048 BPF_MAX_TRAMP_LINKS = 27,
1050 BPF_MAX_TRAMP_LINKS = 38,
1054 struct bpf_tramp_links {
1055 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1059 struct bpf_tramp_run_ctx;
1061 /* Different use cases for BPF trampoline:
1062 * 1. replace nop at the function entry (kprobe equivalent)
1063 * flags = BPF_TRAMP_F_RESTORE_REGS
1064 * fentry = a set of programs to run before returning from trampoline
1066 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1067 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1068 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1069 * fentry = a set of program to run before calling original function
1070 * fexit = a set of program to run after original function
1072 * 3. replace direct call instruction anywhere in the function body
1073 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1075 * fentry = a set of programs to run before returning from trampoline
1076 * With flags = BPF_TRAMP_F_CALL_ORIG
1077 * orig_call = original callback addr or direct function addr
1078 * fentry = a set of program to run before calling original function
1079 * fexit = a set of program to run after original function
1081 struct bpf_tramp_image;
1082 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
1083 const struct btf_func_model *m, u32 flags,
1084 struct bpf_tramp_links *tlinks,
1086 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1087 struct bpf_tramp_run_ctx *run_ctx);
1088 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1089 struct bpf_tramp_run_ctx *run_ctx);
1090 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1091 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1092 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1093 struct bpf_tramp_run_ctx *run_ctx);
1094 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1095 struct bpf_tramp_run_ctx *run_ctx);
1096 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1097 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1100 unsigned long start;
1102 char name[KSYM_NAME_LEN];
1103 struct list_head lnode;
1104 struct latch_tree_node tnode;
1108 enum bpf_tramp_prog_type {
1111 BPF_TRAMP_MODIFY_RETURN,
1113 BPF_TRAMP_REPLACE, /* more than MAX */
1116 struct bpf_tramp_image {
1118 struct bpf_ksym ksym;
1119 struct percpu_ref pcref;
1120 void *ip_after_call;
1123 struct rcu_head rcu;
1124 struct work_struct work;
1128 struct bpf_trampoline {
1129 /* hlist for trampoline_table */
1130 struct hlist_node hlist;
1131 struct ftrace_ops *fops;
1132 /* serializes access to fields of this trampoline */
1138 struct btf_func_model model;
1140 bool ftrace_managed;
1142 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1143 * program by replacing one of its functions. func.addr is the address
1144 * of the function it replaced.
1146 struct bpf_prog *extension_prog;
1147 /* list of BPF programs using this trampoline */
1148 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1149 /* Number of attached programs. A counter per kind. */
1150 int progs_cnt[BPF_TRAMP_MAX];
1151 /* Executable image of trampoline */
1152 struct bpf_tramp_image *cur_image;
1156 struct bpf_attach_target_info {
1157 struct btf_func_model fmodel;
1159 struct module *tgt_mod;
1160 const char *tgt_name;
1161 const struct btf_type *tgt_type;
1164 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1166 struct bpf_dispatcher_prog {
1167 struct bpf_prog *prog;
1171 struct bpf_dispatcher {
1172 /* dispatcher mutex */
1175 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1180 struct bpf_ksym ksym;
1181 #ifdef CONFIG_HAVE_STATIC_CALL
1182 struct static_call_key *sc_key;
1187 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
1189 const struct bpf_insn *insnsi,
1190 bpf_func_t bpf_func)
1192 return bpf_func(ctx, insnsi);
1195 /* the implementation of the opaque uapi struct bpf_dynptr */
1196 struct bpf_dynptr_kern {
1198 /* Size represents the number of usable bytes of dynptr data.
1199 * If for example the offset is at 4 for a local dynptr whose data is
1200 * of type u64, the number of usable bytes is 4.
1202 * The upper 8 bits are reserved. It is as follows:
1203 * Bits 0 - 23 = size
1204 * Bits 24 - 30 = dynptr type
1205 * Bit 31 = whether dynptr is read-only
1211 enum bpf_dynptr_type {
1212 BPF_DYNPTR_TYPE_INVALID,
1213 /* Points to memory that is local to the bpf program */
1214 BPF_DYNPTR_TYPE_LOCAL,
1215 /* Underlying data is a ringbuf record */
1216 BPF_DYNPTR_TYPE_RINGBUF,
1217 /* Underlying data is a sk_buff */
1218 BPF_DYNPTR_TYPE_SKB,
1219 /* Underlying data is a xdp_buff */
1220 BPF_DYNPTR_TYPE_XDP,
1223 int bpf_dynptr_check_size(u32 size);
1224 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1226 #ifdef CONFIG_BPF_JIT
1227 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1228 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1229 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1230 struct bpf_attach_target_info *tgt_info);
1231 void bpf_trampoline_put(struct bpf_trampoline *tr);
1232 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1235 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1236 * indirection with a direct call to the bpf program. If the architecture does
1237 * not have STATIC_CALL, avoid a double-indirection.
1239 #ifdef CONFIG_HAVE_STATIC_CALL
1241 #define __BPF_DISPATCHER_SC_INIT(_name) \
1242 .sc_key = &STATIC_CALL_KEY(_name), \
1243 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1245 #define __BPF_DISPATCHER_SC(name) \
1246 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1248 #define __BPF_DISPATCHER_CALL(name) \
1249 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1251 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1252 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1255 #define __BPF_DISPATCHER_SC_INIT(name)
1256 #define __BPF_DISPATCHER_SC(name)
1257 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1258 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1261 #define BPF_DISPATCHER_INIT(_name) { \
1262 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1263 .func = &_name##_func, \
1270 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1272 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1275 #define DEFINE_BPF_DISPATCHER(name) \
1276 __BPF_DISPATCHER_SC(name); \
1277 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
1279 const struct bpf_insn *insnsi, \
1280 bpf_func_t bpf_func) \
1282 return __BPF_DISPATCHER_CALL(name); \
1284 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1285 struct bpf_dispatcher bpf_dispatcher_##name = \
1286 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1288 #define DECLARE_BPF_DISPATCHER(name) \
1289 unsigned int bpf_dispatcher_##name##_func( \
1291 const struct bpf_insn *insnsi, \
1292 bpf_func_t bpf_func); \
1293 extern struct bpf_dispatcher bpf_dispatcher_##name;
1295 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1296 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1297 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1298 struct bpf_prog *to);
1299 /* Called only from JIT-enabled code, so there's no need for stubs. */
1300 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
1301 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1302 void bpf_ksym_add(struct bpf_ksym *ksym);
1303 void bpf_ksym_del(struct bpf_ksym *ksym);
1304 int bpf_jit_charge_modmem(u32 size);
1305 void bpf_jit_uncharge_modmem(u32 size);
1306 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1308 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1309 struct bpf_trampoline *tr)
1313 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1314 struct bpf_trampoline *tr)
1318 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1319 struct bpf_attach_target_info *tgt_info)
1323 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1324 #define DEFINE_BPF_DISPATCHER(name)
1325 #define DECLARE_BPF_DISPATCHER(name)
1326 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1327 #define BPF_DISPATCHER_PTR(name) NULL
1328 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1329 struct bpf_prog *from,
1330 struct bpf_prog *to) {}
1331 static inline bool is_bpf_image_address(unsigned long address)
1335 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1341 struct bpf_func_info_aux {
1346 enum bpf_jit_poke_reason {
1347 BPF_POKE_REASON_TAIL_CALL,
1350 /* Descriptor of pokes pointing /into/ the JITed image. */
1351 struct bpf_jit_poke_descriptor {
1352 void *tailcall_target;
1353 void *tailcall_bypass;
1358 struct bpf_map *map;
1362 bool tailcall_target_stable;
1368 /* reg_type info for ctx arguments */
1369 struct bpf_ctx_arg_aux {
1371 enum bpf_reg_type reg_type;
1375 struct btf_mod_pair {
1377 struct module *module;
1380 struct bpf_kfunc_desc_tab;
1382 struct bpf_prog_aux {
1391 u32 func_cnt; /* used by non-func prog as the number of func progs */
1392 u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */
1393 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1394 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1395 u32 ctx_arg_info_size;
1396 u32 max_rdonly_access;
1397 u32 max_rdwr_access;
1398 struct btf *attach_btf;
1399 const struct bpf_ctx_arg_aux *ctx_arg_info;
1400 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1401 struct bpf_prog *dst_prog;
1402 struct bpf_trampoline *dst_trampoline;
1403 enum bpf_prog_type saved_dst_prog_type;
1404 enum bpf_attach_type saved_dst_attach_type;
1405 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1406 bool dev_bound; /* Program is bound to the netdev. */
1407 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1408 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1409 bool func_proto_unreliable;
1411 bool tail_call_reachable;
1414 bool exception_boundary;
1415 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1416 const struct btf_type *attach_func_proto;
1417 /* function name for valid attach_btf_id */
1418 const char *attach_func_name;
1419 struct bpf_prog **func;
1420 void *jit_data; /* JIT specific data. arch dependent */
1421 struct bpf_jit_poke_descriptor *poke_tab;
1422 struct bpf_kfunc_desc_tab *kfunc_tab;
1423 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1425 struct bpf_ksym ksym;
1426 const struct bpf_prog_ops *ops;
1427 struct bpf_map **used_maps;
1428 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1429 struct btf_mod_pair *used_btfs;
1430 struct bpf_prog *prog;
1431 struct user_struct *user;
1432 u64 load_time; /* ns since boottime */
1434 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1435 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1436 char name[BPF_OBJ_NAME_LEN];
1437 unsigned int (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp);
1438 #ifdef CONFIG_SECURITY
1441 struct bpf_prog_offload *offload;
1443 struct bpf_func_info *func_info;
1444 struct bpf_func_info_aux *func_info_aux;
1445 /* bpf_line_info loaded from userspace. linfo->insn_off
1446 * has the xlated insn offset.
1447 * Both the main and sub prog share the same linfo.
1448 * The subprog can access its first linfo by
1449 * using the linfo_idx.
1451 struct bpf_line_info *linfo;
1452 /* jited_linfo is the jited addr of the linfo. It has a
1453 * one to one mapping to linfo:
1454 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1455 * Both the main and sub prog share the same jited_linfo.
1456 * The subprog can access its first jited_linfo by
1457 * using the linfo_idx.
1462 /* subprog can use linfo_idx to access its first linfo and
1464 * main prog always has linfo_idx == 0
1469 struct exception_table_entry *extable;
1471 struct work_struct work;
1472 struct rcu_head rcu;
1477 u16 pages; /* Number of allocated pages */
1478 u16 jited:1, /* Is our filter JIT'ed? */
1479 jit_requested:1,/* archs need to JIT the prog */
1480 gpl_compatible:1, /* Is filter GPL compatible? */
1481 cb_access:1, /* Is control block accessed? */
1482 dst_needed:1, /* Do we need dst entry? */
1483 blinding_requested:1, /* needs constant blinding */
1484 blinded:1, /* Was blinded */
1485 is_func:1, /* program is a bpf function */
1486 kprobe_override:1, /* Do we override a kprobe? */
1487 has_callchain_buf:1, /* callchain buffer allocated? */
1488 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1489 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1490 call_get_func_ip:1, /* Do we call get_func_ip() */
1491 tstamp_type_access:1; /* Accessed __sk_buff->tstamp_type */
1492 enum bpf_prog_type type; /* Type of BPF program */
1493 enum bpf_attach_type expected_attach_type; /* For some prog types */
1494 u32 len; /* Number of filter blocks */
1495 u32 jited_len; /* Size of jited insns in bytes */
1496 u8 tag[BPF_TAG_SIZE];
1497 struct bpf_prog_stats __percpu *stats;
1498 int __percpu *active;
1499 unsigned int (*bpf_func)(const void *ctx,
1500 const struct bpf_insn *insn);
1501 struct bpf_prog_aux *aux; /* Auxiliary fields */
1502 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1503 /* Instructions for interpreter */
1505 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1506 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1510 struct bpf_array_aux {
1511 /* Programs with direct jumps into programs part of this array. */
1512 struct list_head poke_progs;
1513 struct bpf_map *map;
1514 struct mutex poke_mutex;
1515 struct work_struct work;
1521 enum bpf_link_type type;
1522 const struct bpf_link_ops *ops;
1523 struct bpf_prog *prog;
1524 struct work_struct work;
1527 struct bpf_link_ops {
1528 void (*release)(struct bpf_link *link);
1529 void (*dealloc)(struct bpf_link *link);
1530 int (*detach)(struct bpf_link *link);
1531 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1532 struct bpf_prog *old_prog);
1533 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1534 int (*fill_link_info)(const struct bpf_link *link,
1535 struct bpf_link_info *info);
1536 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1537 struct bpf_map *old_map);
1540 struct bpf_tramp_link {
1541 struct bpf_link link;
1542 struct hlist_node tramp_hlist;
1546 struct bpf_shim_tramp_link {
1547 struct bpf_tramp_link link;
1548 struct bpf_trampoline *trampoline;
1551 struct bpf_tracing_link {
1552 struct bpf_tramp_link link;
1553 enum bpf_attach_type attach_type;
1554 struct bpf_trampoline *trampoline;
1555 struct bpf_prog *tgt_prog;
1558 struct bpf_link_primer {
1559 struct bpf_link *link;
1565 struct bpf_struct_ops_value;
1568 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1570 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1571 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1572 * of BPF_PROG_TYPE_STRUCT_OPS progs.
1573 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1574 * when determining whether the struct_ops progs in the
1575 * struct_ops map are valid.
1576 * @init: A callback that is invoked a single time, and before any other
1577 * callback, to initialize the structure. A nonzero return value means
1578 * the subsystem could not be initialized.
1579 * @check_member: When defined, a callback invoked by the verifier to allow
1580 * the subsystem to determine if an entry in the struct_ops map
1581 * is valid. A nonzero return value means that the map is
1582 * invalid and should be rejected by the verifier.
1583 * @init_member: A callback that is invoked for each member of the struct_ops
1584 * map to allow the subsystem to initialize the member. A nonzero
1585 * value means the member could not be initialized. This callback
1586 * is exclusive with the @type, @type_id, @value_type, and
1588 * @reg: A callback that is invoked when the struct_ops map has been
1589 * initialized and is being attached to. Zero means the struct_ops map
1590 * has been successfully registered and is live. A nonzero return value
1591 * means the struct_ops map could not be registered.
1592 * @unreg: A callback that is invoked when the struct_ops map should be
1594 * @update: A callback that is invoked when the live struct_ops map is being
1595 * updated to contain new values. This callback is only invoked when
1596 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1597 * it is assumed that the struct_ops map cannot be updated.
1598 * @validate: A callback that is invoked after all of the members have been
1599 * initialized. This callback should perform static checks on the
1600 * map, meaning that it should either fail or succeed
1601 * deterministically. A struct_ops map that has been validated may
1602 * not necessarily succeed in being registered if the call to @reg
1603 * fails. For example, a valid struct_ops map may be loaded, but
1604 * then fail to be registered due to there being another active
1605 * struct_ops map on the system in the subsystem already. For this
1606 * reason, if this callback is not defined, the check is skipped as
1607 * the struct_ops map will have final verification performed in
1610 * @value_type: Value type.
1611 * @name: The name of the struct bpf_struct_ops object.
1612 * @func_models: Func models
1613 * @type_id: BTF type id.
1614 * @value_id: BTF value id.
1616 struct bpf_struct_ops {
1617 const struct bpf_verifier_ops *verifier_ops;
1618 int (*init)(struct btf *btf);
1619 int (*check_member)(const struct btf_type *t,
1620 const struct btf_member *member,
1621 const struct bpf_prog *prog);
1622 int (*init_member)(const struct btf_type *t,
1623 const struct btf_member *member,
1624 void *kdata, const void *udata);
1625 int (*reg)(void *kdata);
1626 void (*unreg)(void *kdata);
1627 int (*update)(void *kdata, void *old_kdata);
1628 int (*validate)(void *kdata);
1629 const struct btf_type *type;
1630 const struct btf_type *value_type;
1632 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1637 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1638 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1639 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1640 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1641 bool bpf_struct_ops_get(const void *kdata);
1642 void bpf_struct_ops_put(const void *kdata);
1643 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1645 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1646 struct bpf_tramp_link *link,
1647 const struct btf_func_model *model,
1648 void *image, void *image_end);
1649 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1651 if (owner == BPF_MODULE_OWNER)
1652 return bpf_struct_ops_get(data);
1654 return try_module_get(owner);
1656 static inline void bpf_module_put(const void *data, struct module *owner)
1658 if (owner == BPF_MODULE_OWNER)
1659 bpf_struct_ops_put(data);
1663 int bpf_struct_ops_link_create(union bpf_attr *attr);
1666 /* Define it here to avoid the use of forward declaration */
1667 struct bpf_dummy_ops_state {
1671 struct bpf_dummy_ops {
1672 int (*test_1)(struct bpf_dummy_ops_state *cb);
1673 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1674 char a3, unsigned long a4);
1675 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1678 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1679 union bpf_attr __user *uattr);
1682 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1686 static inline void bpf_struct_ops_init(struct btf *btf,
1687 struct bpf_verifier_log *log)
1690 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1692 return try_module_get(owner);
1694 static inline void bpf_module_put(const void *data, struct module *owner)
1698 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1704 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1711 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1712 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1714 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1716 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1721 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1730 struct bpf_array_aux *aux;
1732 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1733 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1734 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1738 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1739 #define MAX_TAIL_CALL_CNT 33
1741 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1742 * It's enum to expose it (and thus make it discoverable) through BTF.
1745 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1748 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1749 BPF_F_RDONLY_PROG | \
1753 #define BPF_MAP_CAN_READ BIT(0)
1754 #define BPF_MAP_CAN_WRITE BIT(1)
1756 /* Maximum number of user-producer ring buffer samples that can be drained in
1757 * a call to bpf_user_ringbuf_drain().
1759 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1761 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1763 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1765 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1768 if (access_flags & BPF_F_RDONLY_PROG)
1769 return BPF_MAP_CAN_READ;
1770 else if (access_flags & BPF_F_WRONLY_PROG)
1771 return BPF_MAP_CAN_WRITE;
1773 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1776 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1778 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1779 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1782 struct bpf_event_entry {
1783 struct perf_event *event;
1784 struct file *perf_file;
1785 struct file *map_file;
1786 struct rcu_head rcu;
1789 static inline bool map_type_contains_progs(struct bpf_map *map)
1791 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1792 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1793 map->map_type == BPF_MAP_TYPE_CPUMAP;
1796 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1797 int bpf_prog_calc_tag(struct bpf_prog *fp);
1799 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1800 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1802 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1803 unsigned long off, unsigned long len);
1804 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1805 const struct bpf_insn *src,
1806 struct bpf_insn *dst,
1807 struct bpf_prog *prog,
1810 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1811 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1813 /* an array of programs to be executed under rcu_lock.
1816 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
1818 * the structure returned by bpf_prog_array_alloc() should be populated
1819 * with program pointers and the last pointer must be NULL.
1820 * The user has to keep refcnt on the program and make sure the program
1821 * is removed from the array before bpf_prog_put().
1822 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1823 * since other cpus are walking the array of pointers in parallel.
1825 struct bpf_prog_array_item {
1826 struct bpf_prog *prog;
1828 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1833 struct bpf_prog_array {
1834 struct rcu_head rcu;
1835 struct bpf_prog_array_item items[];
1838 struct bpf_empty_prog_array {
1839 struct bpf_prog_array hdr;
1840 struct bpf_prog *null_prog;
1843 /* to avoid allocating empty bpf_prog_array for cgroups that
1844 * don't have bpf program attached use one global 'bpf_empty_prog_array'
1845 * It will not be modified the caller of bpf_prog_array_alloc()
1846 * (since caller requested prog_cnt == 0)
1847 * that pointer should be 'freed' by bpf_prog_array_free()
1849 extern struct bpf_empty_prog_array bpf_empty_prog_array;
1851 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1852 void bpf_prog_array_free(struct bpf_prog_array *progs);
1853 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
1854 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
1855 int bpf_prog_array_length(struct bpf_prog_array *progs);
1856 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1857 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1858 __u32 __user *prog_ids, u32 cnt);
1860 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1861 struct bpf_prog *old_prog);
1862 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1863 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1864 struct bpf_prog *prog);
1865 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1866 u32 *prog_ids, u32 request_cnt,
1868 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1869 struct bpf_prog *exclude_prog,
1870 struct bpf_prog *include_prog,
1872 struct bpf_prog_array **new_array);
1874 struct bpf_run_ctx {};
1876 struct bpf_cg_run_ctx {
1877 struct bpf_run_ctx run_ctx;
1878 const struct bpf_prog_array_item *prog_item;
1882 struct bpf_trace_run_ctx {
1883 struct bpf_run_ctx run_ctx;
1888 struct bpf_tramp_run_ctx {
1889 struct bpf_run_ctx run_ctx;
1891 struct bpf_run_ctx *saved_run_ctx;
1894 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1896 struct bpf_run_ctx *old_ctx = NULL;
1898 #ifdef CONFIG_BPF_SYSCALL
1899 old_ctx = current->bpf_ctx;
1900 current->bpf_ctx = new_ctx;
1905 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1907 #ifdef CONFIG_BPF_SYSCALL
1908 current->bpf_ctx = old_ctx;
1912 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1913 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1914 /* BPF program asks to set CN on the packet. */
1915 #define BPF_RET_SET_CN (1 << 0)
1917 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1919 static __always_inline u32
1920 bpf_prog_run_array(const struct bpf_prog_array *array,
1921 const void *ctx, bpf_prog_run_fn run_prog)
1923 const struct bpf_prog_array_item *item;
1924 const struct bpf_prog *prog;
1925 struct bpf_run_ctx *old_run_ctx;
1926 struct bpf_trace_run_ctx run_ctx;
1929 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
1931 if (unlikely(!array))
1934 run_ctx.is_uprobe = false;
1937 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1938 item = &array->items[0];
1939 while ((prog = READ_ONCE(item->prog))) {
1940 run_ctx.bpf_cookie = item->bpf_cookie;
1941 ret &= run_prog(prog, ctx);
1944 bpf_reset_run_ctx(old_run_ctx);
1949 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
1951 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
1952 * overall. As a result, we must use the bpf_prog_array_free_sleepable
1953 * in order to use the tasks_trace rcu grace period.
1955 * When a non-sleepable program is inside the array, we take the rcu read
1956 * section and disable preemption for that program alone, so it can access
1957 * rcu-protected dynamically sized maps.
1959 static __always_inline u32
1960 bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu *array_rcu,
1961 const void *ctx, bpf_prog_run_fn run_prog)
1963 const struct bpf_prog_array_item *item;
1964 const struct bpf_prog *prog;
1965 const struct bpf_prog_array *array;
1966 struct bpf_run_ctx *old_run_ctx;
1967 struct bpf_trace_run_ctx run_ctx;
1972 rcu_read_lock_trace();
1975 run_ctx.is_uprobe = true;
1977 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());
1978 if (unlikely(!array))
1980 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1981 item = &array->items[0];
1982 while ((prog = READ_ONCE(item->prog))) {
1983 if (!prog->aux->sleepable)
1986 run_ctx.bpf_cookie = item->bpf_cookie;
1987 ret &= run_prog(prog, ctx);
1990 if (!prog->aux->sleepable)
1993 bpf_reset_run_ctx(old_run_ctx);
1996 rcu_read_unlock_trace();
2000 #ifdef CONFIG_BPF_SYSCALL
2001 DECLARE_PER_CPU(int, bpf_prog_active);
2002 extern struct mutex bpf_stats_enabled_mutex;
2005 * Block execution of BPF programs attached to instrumentation (perf,
2006 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2007 * these events can happen inside a region which holds a map bucket lock
2008 * and can deadlock on it.
2010 static inline void bpf_disable_instrumentation(void)
2013 this_cpu_inc(bpf_prog_active);
2016 static inline void bpf_enable_instrumentation(void)
2018 this_cpu_dec(bpf_prog_active);
2022 extern const struct file_operations bpf_map_fops;
2023 extern const struct file_operations bpf_prog_fops;
2024 extern const struct file_operations bpf_iter_fops;
2026 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2027 extern const struct bpf_prog_ops _name ## _prog_ops; \
2028 extern const struct bpf_verifier_ops _name ## _verifier_ops;
2029 #define BPF_MAP_TYPE(_id, _ops) \
2030 extern const struct bpf_map_ops _ops;
2031 #define BPF_LINK_TYPE(_id, _name)
2032 #include <linux/bpf_types.h>
2033 #undef BPF_PROG_TYPE
2035 #undef BPF_LINK_TYPE
2037 extern const struct bpf_prog_ops bpf_offload_prog_ops;
2038 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2039 extern const struct bpf_verifier_ops xdp_analyzer_ops;
2041 struct bpf_prog *bpf_prog_get(u32 ufd);
2042 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2044 void bpf_prog_add(struct bpf_prog *prog, int i);
2045 void bpf_prog_sub(struct bpf_prog *prog, int i);
2046 void bpf_prog_inc(struct bpf_prog *prog);
2047 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2048 void bpf_prog_put(struct bpf_prog *prog);
2050 void bpf_prog_free_id(struct bpf_prog *prog);
2051 void bpf_map_free_id(struct bpf_map *map);
2053 struct btf_field *btf_record_find(const struct btf_record *rec,
2054 u32 offset, u32 field_mask);
2055 void btf_record_free(struct btf_record *rec);
2056 void bpf_map_free_record(struct bpf_map *map);
2057 struct btf_record *btf_record_dup(const struct btf_record *rec);
2058 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2059 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2060 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2061 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);
2063 struct bpf_map *bpf_map_get(u32 ufd);
2064 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2065 struct bpf_map *__bpf_map_get(struct fd f);
2066 void bpf_map_inc(struct bpf_map *map);
2067 void bpf_map_inc_with_uref(struct bpf_map *map);
2068 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2069 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2070 void bpf_map_put_with_uref(struct bpf_map *map);
2071 void bpf_map_put(struct bpf_map *map);
2072 void *bpf_map_area_alloc(u64 size, int numa_node);
2073 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2074 void bpf_map_area_free(void *base);
2075 bool bpf_map_write_active(const struct bpf_map *map);
2076 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2077 int generic_map_lookup_batch(struct bpf_map *map,
2078 const union bpf_attr *attr,
2079 union bpf_attr __user *uattr);
2080 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2081 const union bpf_attr *attr,
2082 union bpf_attr __user *uattr);
2083 int generic_map_delete_batch(struct bpf_map *map,
2084 const union bpf_attr *attr,
2085 union bpf_attr __user *uattr);
2086 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2087 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2089 #ifdef CONFIG_MEMCG_KMEM
2090 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2092 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2093 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2095 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2096 size_t align, gfp_t flags);
2098 static inline void *
2099 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2102 return kmalloc_node(size, flags, node);
2105 static inline void *
2106 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
2108 return kzalloc(size, flags);
2111 static inline void *
2112 bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
2114 return kvcalloc(n, size, flags);
2117 static inline void __percpu *
2118 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
2121 return __alloc_percpu_gfp(size, align, flags);
2126 bpf_map_init_elem_count(struct bpf_map *map)
2128 size_t size = sizeof(*map->elem_count), align = size;
2129 gfp_t flags = GFP_USER | __GFP_NOWARN;
2131 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2132 if (!map->elem_count)
2139 bpf_map_free_elem_count(struct bpf_map *map)
2141 free_percpu(map->elem_count);
2144 static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2146 this_cpu_inc(*map->elem_count);
2149 static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2151 this_cpu_dec(*map->elem_count);
2154 extern int sysctl_unprivileged_bpf_disabled;
2156 static inline bool bpf_allow_ptr_leaks(void)
2158 return perfmon_capable();
2161 static inline bool bpf_allow_uninit_stack(void)
2163 return perfmon_capable();
2166 static inline bool bpf_bypass_spec_v1(void)
2168 return cpu_mitigations_off() || perfmon_capable();
2171 static inline bool bpf_bypass_spec_v4(void)
2173 return cpu_mitigations_off() || perfmon_capable();
2176 int bpf_map_new_fd(struct bpf_map *map, int flags);
2177 int bpf_prog_new_fd(struct bpf_prog *prog);
2179 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2180 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2181 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2182 int bpf_link_settle(struct bpf_link_primer *primer);
2183 void bpf_link_cleanup(struct bpf_link_primer *primer);
2184 void bpf_link_inc(struct bpf_link *link);
2185 void bpf_link_put(struct bpf_link *link);
2186 int bpf_link_new_fd(struct bpf_link *link);
2187 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2188 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2190 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2191 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2193 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2194 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2195 extern int bpf_iter_ ## target(args); \
2196 int __init bpf_iter_ ## target(args) { return 0; }
2199 * The task type of iterators.
2201 * For BPF task iterators, they can be parameterized with various
2202 * parameters to visit only some of tasks.
2204 * BPF_TASK_ITER_ALL (default)
2205 * Iterate over resources of every task.
2208 * Iterate over resources of a task/tid.
2210 * BPF_TASK_ITER_TGID
2211 * Iterate over resources of every task of a process / task group.
2213 enum bpf_iter_task_type {
2214 BPF_TASK_ITER_ALL = 0,
2219 struct bpf_iter_aux_info {
2220 /* for map_elem iter */
2221 struct bpf_map *map;
2223 /* for cgroup iter */
2225 struct cgroup *start; /* starting cgroup */
2226 enum bpf_cgroup_iter_order order;
2229 enum bpf_iter_task_type type;
2234 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2235 union bpf_iter_link_info *linfo,
2236 struct bpf_iter_aux_info *aux);
2237 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2238 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2239 struct seq_file *seq);
2240 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2241 struct bpf_link_info *info);
2242 typedef const struct bpf_func_proto *
2243 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2244 const struct bpf_prog *prog);
2246 enum bpf_iter_feature {
2247 BPF_ITER_RESCHED = BIT(0),
2250 #define BPF_ITER_CTX_ARG_MAX 2
2251 struct bpf_iter_reg {
2253 bpf_iter_attach_target_t attach_target;
2254 bpf_iter_detach_target_t detach_target;
2255 bpf_iter_show_fdinfo_t show_fdinfo;
2256 bpf_iter_fill_link_info_t fill_link_info;
2257 bpf_iter_get_func_proto_t get_func_proto;
2258 u32 ctx_arg_info_size;
2260 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2261 const struct bpf_iter_seq_info *seq_info;
2264 struct bpf_iter_meta {
2265 __bpf_md_ptr(struct seq_file *, seq);
2270 struct bpf_iter__bpf_map_elem {
2271 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2272 __bpf_md_ptr(struct bpf_map *, map);
2273 __bpf_md_ptr(void *, key);
2274 __bpf_md_ptr(void *, value);
2277 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2278 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2279 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2280 const struct bpf_func_proto *
2281 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2282 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2283 int bpf_iter_new_fd(struct bpf_link *link);
2284 bool bpf_link_is_iter(struct bpf_link *link);
2285 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2286 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2287 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2288 struct seq_file *seq);
2289 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2290 struct bpf_link_info *info);
2292 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2293 struct bpf_func_state *caller,
2294 struct bpf_func_state *callee);
2296 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2297 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2298 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2300 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2303 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2305 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2306 void *key, void *value, u64 map_flags);
2307 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2308 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2309 void *key, void *value, u64 map_flags);
2310 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2312 int bpf_get_file_flag(int flags);
2313 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2314 size_t actual_size);
2316 /* verify correctness of eBPF program */
2317 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2319 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2320 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2323 struct btf *bpf_get_btf_vmlinux(void);
2328 struct bpf_dtab_netdev;
2329 struct bpf_cpu_map_entry;
2331 void __dev_flush(void);
2332 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2333 struct net_device *dev_rx);
2334 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2335 struct net_device *dev_rx);
2336 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2337 struct bpf_map *map, bool exclude_ingress);
2338 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2339 struct bpf_prog *xdp_prog);
2340 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2341 struct bpf_prog *xdp_prog, struct bpf_map *map,
2342 bool exclude_ingress);
2344 void __cpu_map_flush(void);
2345 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2346 struct net_device *dev_rx);
2347 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2348 struct sk_buff *skb);
2350 /* Return map's numa specified by userspace */
2351 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2353 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2354 attr->numa_node : NUMA_NO_NODE;
2357 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2358 int array_map_alloc_check(union bpf_attr *attr);
2360 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2361 union bpf_attr __user *uattr);
2362 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2363 union bpf_attr __user *uattr);
2364 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2365 const union bpf_attr *kattr,
2366 union bpf_attr __user *uattr);
2367 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2368 const union bpf_attr *kattr,
2369 union bpf_attr __user *uattr);
2370 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2371 const union bpf_attr *kattr,
2372 union bpf_attr __user *uattr);
2373 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2374 const union bpf_attr *kattr,
2375 union bpf_attr __user *uattr);
2376 int bpf_prog_test_run_nf(struct bpf_prog *prog,
2377 const union bpf_attr *kattr,
2378 union bpf_attr __user *uattr);
2379 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2380 const struct bpf_prog *prog,
2381 struct bpf_insn_access_aux *info);
2383 static inline bool bpf_tracing_ctx_access(int off, int size,
2384 enum bpf_access_type type)
2386 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2388 if (type != BPF_READ)
2390 if (off % size != 0)
2395 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2396 enum bpf_access_type type,
2397 const struct bpf_prog *prog,
2398 struct bpf_insn_access_aux *info)
2400 if (!bpf_tracing_ctx_access(off, size, type))
2402 return btf_ctx_access(off, size, type, prog, info);
2405 int btf_struct_access(struct bpf_verifier_log *log,
2406 const struct bpf_reg_state *reg,
2407 int off, int size, enum bpf_access_type atype,
2408 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2409 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2410 const struct btf *btf, u32 id, int off,
2411 const struct btf *need_btf, u32 need_type_id,
2414 int btf_distill_func_proto(struct bpf_verifier_log *log,
2416 const struct btf_type *func_proto,
2417 const char *func_name,
2418 struct btf_func_model *m);
2420 struct bpf_reg_state;
2421 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
2422 struct bpf_reg_state *regs);
2423 int btf_check_subprog_call(struct bpf_verifier_env *env, int subprog,
2424 struct bpf_reg_state *regs);
2425 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
2426 struct bpf_reg_state *reg, bool is_ex_cb);
2427 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2428 struct btf *btf, const struct btf_type *t);
2429 const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
2430 int comp_idx, const char *tag_key);
2432 struct bpf_prog *bpf_prog_by_id(u32 id);
2433 struct bpf_link *bpf_link_by_id(u32 id);
2435 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
2436 void bpf_task_storage_free(struct task_struct *task);
2437 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2438 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2439 const struct btf_func_model *
2440 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2441 const struct bpf_insn *insn);
2442 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2443 u16 btf_fd_idx, u8 **func_addr);
2445 struct bpf_core_ctx {
2446 struct bpf_verifier_log *log;
2447 const struct btf *btf;
2450 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2451 const struct bpf_reg_state *reg,
2452 const char *field_name, u32 btf_id, const char *suffix);
2454 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2455 const struct btf *reg_btf, u32 reg_id,
2456 const struct btf *arg_btf, u32 arg_id);
2458 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2459 int relo_idx, void *insn);
2461 static inline bool unprivileged_ebpf_enabled(void)
2463 return !sysctl_unprivileged_bpf_disabled;
2466 /* Not all bpf prog type has the bpf_ctx.
2467 * For the bpf prog type that has initialized the bpf_ctx,
2468 * this function can be used to decide if a kernel function
2469 * is called by a bpf program.
2471 static inline bool has_current_bpf_ctx(void)
2473 return !!current->bpf_ctx;
2476 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2478 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2479 enum bpf_dynptr_type type, u32 offset, u32 size);
2480 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2481 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2483 bool dev_check_flush(void);
2484 bool cpu_map_check_flush(void);
2485 #else /* !CONFIG_BPF_SYSCALL */
2486 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2488 return ERR_PTR(-EOPNOTSUPP);
2491 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2492 enum bpf_prog_type type,
2495 return ERR_PTR(-EOPNOTSUPP);
2498 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2502 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2506 static inline void bpf_prog_put(struct bpf_prog *prog)
2510 static inline void bpf_prog_inc(struct bpf_prog *prog)
2514 static inline struct bpf_prog *__must_check
2515 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2517 return ERR_PTR(-EOPNOTSUPP);
2520 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2521 const struct bpf_link_ops *ops,
2522 struct bpf_prog *prog)
2526 static inline int bpf_link_prime(struct bpf_link *link,
2527 struct bpf_link_primer *primer)
2532 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2537 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2541 static inline void bpf_link_inc(struct bpf_link *link)
2545 static inline void bpf_link_put(struct bpf_link *link)
2549 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2554 static inline void __dev_flush(void)
2559 struct bpf_dtab_netdev;
2560 struct bpf_cpu_map_entry;
2563 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2564 struct net_device *dev_rx)
2570 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2571 struct net_device *dev_rx)
2577 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2578 struct bpf_map *map, bool exclude_ingress)
2585 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2586 struct sk_buff *skb,
2587 struct bpf_prog *xdp_prog)
2593 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2594 struct bpf_prog *xdp_prog, struct bpf_map *map,
2595 bool exclude_ingress)
2600 static inline void __cpu_map_flush(void)
2604 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2605 struct xdp_frame *xdpf,
2606 struct net_device *dev_rx)
2611 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2612 struct sk_buff *skb)
2617 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2618 enum bpf_prog_type type)
2620 return ERR_PTR(-EOPNOTSUPP);
2623 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2624 const union bpf_attr *kattr,
2625 union bpf_attr __user *uattr)
2630 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2631 const union bpf_attr *kattr,
2632 union bpf_attr __user *uattr)
2637 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2638 const union bpf_attr *kattr,
2639 union bpf_attr __user *uattr)
2644 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2645 const union bpf_attr *kattr,
2646 union bpf_attr __user *uattr)
2651 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2652 const union bpf_attr *kattr,
2653 union bpf_attr __user *uattr)
2658 static inline void bpf_map_put(struct bpf_map *map)
2662 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2664 return ERR_PTR(-ENOTSUPP);
2667 static inline int btf_struct_access(struct bpf_verifier_log *log,
2668 const struct bpf_reg_state *reg,
2669 int off, int size, enum bpf_access_type atype,
2670 u32 *next_btf_id, enum bpf_type_flag *flag,
2671 const char **field_name)
2676 static inline const struct bpf_func_proto *
2677 bpf_base_func_proto(enum bpf_func_id func_id)
2682 static inline void bpf_task_storage_free(struct task_struct *task)
2686 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2691 static inline const struct btf_func_model *
2692 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2693 const struct bpf_insn *insn)
2699 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2700 u16 btf_fd_idx, u8 **func_addr)
2705 static inline bool unprivileged_ebpf_enabled(void)
2710 static inline bool has_current_bpf_ctx(void)
2715 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2719 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
2723 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2724 enum bpf_dynptr_type type, u32 offset, u32 size)
2728 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
2732 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
2735 #endif /* CONFIG_BPF_SYSCALL */
2737 static __always_inline int
2738 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
2742 if (IS_ENABLED(CONFIG_BPF_EVENTS))
2743 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
2744 if (unlikely(ret < 0))
2745 memset(dst, 0, size);
2749 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2750 struct btf_mod_pair *used_btfs, u32 len);
2752 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2753 enum bpf_prog_type type)
2755 return bpf_prog_get_type_dev(ufd, type, false);
2758 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2759 struct bpf_map **used_maps, u32 len);
2761 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2763 int bpf_prog_offload_compile(struct bpf_prog *prog);
2764 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
2765 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2766 struct bpf_prog *prog);
2768 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2770 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2771 int bpf_map_offload_update_elem(struct bpf_map *map,
2772 void *key, void *value, u64 flags);
2773 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2774 int bpf_map_offload_get_next_key(struct bpf_map *map,
2775 void *key, void *next_key);
2777 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2779 struct bpf_offload_dev *
2780 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2781 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2782 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2783 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2784 struct net_device *netdev);
2785 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2786 struct net_device *netdev);
2787 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2789 void unpriv_ebpf_notify(int new_state);
2791 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2792 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2793 struct bpf_prog_aux *prog_aux);
2794 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
2795 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
2796 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
2797 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
2799 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2801 return aux->dev_bound;
2804 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
2806 return aux->offload_requested;
2809 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
2811 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2813 return unlikely(map->ops == &bpf_map_offload_ops);
2816 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2817 void bpf_map_offload_map_free(struct bpf_map *map);
2818 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
2819 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2820 const union bpf_attr *kattr,
2821 union bpf_attr __user *uattr);
2823 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2824 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2825 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2826 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2827 union bpf_attr __user *uattr);
2829 void sock_map_unhash(struct sock *sk);
2830 void sock_map_destroy(struct sock *sk);
2831 void sock_map_close(struct sock *sk, long timeout);
2833 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2834 struct bpf_prog_aux *prog_aux)
2839 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
2845 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
2846 union bpf_attr *attr)
2851 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
2852 struct bpf_prog *old_prog)
2857 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
2861 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2866 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
2871 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
2876 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2881 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2883 return ERR_PTR(-EOPNOTSUPP);
2886 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2890 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
2895 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2896 const union bpf_attr *kattr,
2897 union bpf_attr __user *uattr)
2902 #ifdef CONFIG_BPF_SYSCALL
2903 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2904 struct bpf_prog *prog)
2909 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2910 enum bpf_prog_type ptype)
2915 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2921 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2922 union bpf_attr __user *uattr)
2926 #endif /* CONFIG_BPF_SYSCALL */
2927 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2929 static __always_inline void
2930 bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
2932 const struct bpf_prog_array_item *item;
2933 struct bpf_prog *prog;
2935 if (unlikely(!array))
2938 item = &array->items[0];
2939 while ((prog = READ_ONCE(item->prog))) {
2940 bpf_prog_inc_misses_counter(prog);
2945 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2946 void bpf_sk_reuseport_detach(struct sock *sk);
2947 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2949 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2950 void *value, u64 map_flags);
2952 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2956 #ifdef CONFIG_BPF_SYSCALL
2957 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2958 void *key, void *value)
2963 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2964 void *key, void *value,
2969 #endif /* CONFIG_BPF_SYSCALL */
2970 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2972 /* verifier prototypes for helper functions called from eBPF programs */
2973 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2974 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2975 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2976 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2977 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2978 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2979 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
2981 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2982 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2983 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2984 extern const struct bpf_func_proto bpf_tail_call_proto;
2985 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2986 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2987 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
2988 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2989 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2990 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2991 extern const struct bpf_func_proto bpf_get_stackid_proto;
2992 extern const struct bpf_func_proto bpf_get_stack_proto;
2993 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2994 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2995 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2996 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2997 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2998 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2999 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3000 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3001 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3002 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3003 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3004 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3005 extern const struct bpf_func_proto bpf_spin_lock_proto;
3006 extern const struct bpf_func_proto bpf_spin_unlock_proto;
3007 extern const struct bpf_func_proto bpf_get_local_storage_proto;
3008 extern const struct bpf_func_proto bpf_strtol_proto;
3009 extern const struct bpf_func_proto bpf_strtoul_proto;
3010 extern const struct bpf_func_proto bpf_tcp_sock_proto;
3011 extern const struct bpf_func_proto bpf_jiffies64_proto;
3012 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3013 extern const struct bpf_func_proto bpf_event_output_data_proto;
3014 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3015 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3016 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3017 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3018 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3019 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3020 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3021 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3022 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3023 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3024 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3025 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3026 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3027 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3028 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3029 extern const struct bpf_func_proto bpf_copy_from_user_proto;
3030 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3031 extern const struct bpf_func_proto bpf_snprintf_proto;
3032 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3033 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3034 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3035 extern const struct bpf_func_proto bpf_sock_from_file_proto;
3036 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3037 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3038 extern const struct bpf_func_proto bpf_task_storage_get_proto;
3039 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3040 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3041 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3042 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3043 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3044 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3045 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3046 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3047 extern const struct bpf_func_proto bpf_find_vma_proto;
3048 extern const struct bpf_func_proto bpf_loop_proto;
3049 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3050 extern const struct bpf_func_proto bpf_set_retval_proto;
3051 extern const struct bpf_func_proto bpf_get_retval_proto;
3052 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3053 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3054 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3056 const struct bpf_func_proto *tracing_prog_func_proto(
3057 enum bpf_func_id func_id, const struct bpf_prog *prog);
3059 /* Shared helpers among cBPF and eBPF. */
3060 void bpf_user_rnd_init_once(void);
3061 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3062 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3064 #if defined(CONFIG_NET)
3065 bool bpf_sock_common_is_valid_access(int off, int size,
3066 enum bpf_access_type type,
3067 struct bpf_insn_access_aux *info);
3068 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3069 struct bpf_insn_access_aux *info);
3070 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3071 const struct bpf_insn *si,
3072 struct bpf_insn *insn_buf,
3073 struct bpf_prog *prog,
3075 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3076 struct bpf_dynptr_kern *ptr);
3078 static inline bool bpf_sock_common_is_valid_access(int off, int size,
3079 enum bpf_access_type type,
3080 struct bpf_insn_access_aux *info)
3084 static inline bool bpf_sock_is_valid_access(int off, int size,
3085 enum bpf_access_type type,
3086 struct bpf_insn_access_aux *info)
3090 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3091 const struct bpf_insn *si,
3092 struct bpf_insn *insn_buf,
3093 struct bpf_prog *prog,
3098 static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3099 struct bpf_dynptr_kern *ptr)
3106 struct sk_reuseport_kern {
3107 struct sk_buff *skb;
3109 struct sock *selected_sk;
3110 struct sock *migrating_sk;
3116 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3117 struct bpf_insn_access_aux *info);
3119 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3120 const struct bpf_insn *si,
3121 struct bpf_insn *insn_buf,
3122 struct bpf_prog *prog,
3125 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3126 struct bpf_insn_access_aux *info);
3128 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3129 const struct bpf_insn *si,
3130 struct bpf_insn *insn_buf,
3131 struct bpf_prog *prog,
3134 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3135 enum bpf_access_type type,
3136 struct bpf_insn_access_aux *info)
3141 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3142 const struct bpf_insn *si,
3143 struct bpf_insn *insn_buf,
3144 struct bpf_prog *prog,
3149 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3150 enum bpf_access_type type,
3151 struct bpf_insn_access_aux *info)
3156 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3157 const struct bpf_insn *si,
3158 struct bpf_insn *insn_buf,
3159 struct bpf_prog *prog,
3164 #endif /* CONFIG_INET */
3166 enum bpf_text_poke_type {
3171 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3172 void *addr1, void *addr2);
3174 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3175 int bpf_arch_text_invalidate(void *dst, size_t len);
3178 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3180 #define MAX_BPRINTF_VARARGS 12
3181 #define MAX_BPRINTF_BUF 1024
3183 struct bpf_bprintf_data {
3190 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3191 u32 num_args, struct bpf_bprintf_data *data);
3192 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3194 #ifdef CONFIG_BPF_LSM
3195 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3196 void bpf_cgroup_atype_put(int cgroup_atype);
3198 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
3199 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3200 #endif /* CONFIG_BPF_LSM */
3209 #endif /* CONFIG_KEYS */
3211 static inline bool type_is_alloc(u32 type)
3213 return type & MEM_ALLOC;
3216 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3218 if (memcg_bpf_enabled())
3219 return flags | __GFP_ACCOUNT;
3223 static inline bool bpf_is_subprog(const struct bpf_prog *prog)
3225 return prog->aux->func_idx != 0;
3228 #endif /* _LINUX_BPF_H */