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>
32 #include <linux/cfi.h>
34 struct bpf_verifier_env;
35 struct bpf_verifier_log;
45 struct exception_table_entry;
46 struct seq_operations;
47 struct bpf_iter_aux_info;
48 struct bpf_local_storage;
49 struct bpf_local_storage_map;
53 struct bpf_func_state;
57 struct user_namespace;
61 extern struct idr btf_idr;
62 extern spinlock_t btf_idr_lock;
63 extern struct kobject *btf_kobj;
64 extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
65 extern bool bpf_global_ma_set;
67 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
68 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
69 struct bpf_iter_aux_info *aux);
70 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
71 typedef unsigned int (*bpf_func_t)(const void *,
72 const struct bpf_insn *);
73 struct bpf_iter_seq_info {
74 const struct seq_operations *seq_ops;
75 bpf_iter_init_seq_priv_t init_seq_private;
76 bpf_iter_fini_seq_priv_t fini_seq_private;
80 /* map is generic key/value storage optionally accessible by eBPF programs */
82 /* funcs callable from userspace (via syscall) */
83 int (*map_alloc_check)(union bpf_attr *attr);
84 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
85 void (*map_release)(struct bpf_map *map, struct file *map_file);
86 void (*map_free)(struct bpf_map *map);
87 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
88 void (*map_release_uref)(struct bpf_map *map);
89 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
90 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
91 union bpf_attr __user *uattr);
92 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
93 void *value, u64 flags);
94 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
95 const union bpf_attr *attr,
96 union bpf_attr __user *uattr);
97 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
98 const union bpf_attr *attr,
99 union bpf_attr __user *uattr);
100 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
101 union bpf_attr __user *uattr);
103 /* funcs callable from userspace and from eBPF programs */
104 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
105 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
106 long (*map_delete_elem)(struct bpf_map *map, void *key);
107 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
108 long (*map_pop_elem)(struct bpf_map *map, void *value);
109 long (*map_peek_elem)(struct bpf_map *map, void *value);
110 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
112 /* funcs called by prog_array and perf_event_array map */
113 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
115 /* If need_defer is true, the implementation should guarantee that
116 * the to-be-put element is still alive before the bpf program, which
117 * may manipulate it, exists.
119 void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
120 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
121 u32 (*map_fd_sys_lookup_elem)(void *ptr);
122 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
124 int (*map_check_btf)(const struct bpf_map *map,
125 const struct btf *btf,
126 const struct btf_type *key_type,
127 const struct btf_type *value_type);
129 /* Prog poke tracking helpers. */
130 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
131 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
132 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
133 struct bpf_prog *new);
135 /* Direct value access helpers. */
136 int (*map_direct_value_addr)(const struct bpf_map *map,
138 int (*map_direct_value_meta)(const struct bpf_map *map,
140 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
141 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
142 struct poll_table_struct *pts);
143 unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr,
144 unsigned long len, unsigned long pgoff,
145 unsigned long flags);
147 /* Functions called by bpf_local_storage maps */
148 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
149 void *owner, u32 size);
150 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
151 void *owner, u32 size);
152 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
155 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
157 /* map_meta_equal must be implemented for maps that can be
158 * used as an inner map. It is a runtime check to ensure
159 * an inner map can be inserted to an outer map.
161 * Some properties of the inner map has been used during the
162 * verification time. When inserting an inner map at the runtime,
163 * map_meta_equal has to ensure the inserting map has the same
164 * properties that the verifier has used earlier.
166 bool (*map_meta_equal)(const struct bpf_map *meta0,
167 const struct bpf_map *meta1);
170 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
171 struct bpf_func_state *caller,
172 struct bpf_func_state *callee);
173 long (*map_for_each_callback)(struct bpf_map *map,
174 bpf_callback_t callback_fn,
175 void *callback_ctx, u64 flags);
177 u64 (*map_mem_usage)(const struct bpf_map *map);
179 /* BTF id of struct allocated by map_alloc */
182 /* bpf_iter info used to open a seq_file */
183 const struct bpf_iter_seq_info *iter_seq_info;
187 /* Support at most 11 fields in a BTF type */
191 enum btf_field_type {
192 BPF_SPIN_LOCK = (1 << 0),
193 BPF_TIMER = (1 << 1),
194 BPF_KPTR_UNREF = (1 << 2),
195 BPF_KPTR_REF = (1 << 3),
196 BPF_KPTR_PERCPU = (1 << 4),
197 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,
198 BPF_LIST_HEAD = (1 << 5),
199 BPF_LIST_NODE = (1 << 6),
200 BPF_RB_ROOT = (1 << 7),
201 BPF_RB_NODE = (1 << 8),
202 BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE,
203 BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD,
204 BPF_REFCOUNT = (1 << 9),
205 BPF_WORKQUEUE = (1 << 10),
206 BPF_UPTR = (1 << 11),
209 typedef void (*btf_dtor_kfunc_t)(void *);
211 struct btf_field_kptr {
213 struct module *module;
214 /* dtor used if btf_is_kernel(btf), otherwise the type is
215 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
217 btf_dtor_kfunc_t dtor;
221 struct btf_field_graph_root {
225 struct btf_record *value_rec;
231 enum btf_field_type type;
233 struct btf_field_kptr kptr;
234 struct btf_field_graph_root graph_root;
245 struct btf_field fields[];
248 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
249 struct bpf_rb_node_kern {
250 struct rb_node rb_node;
252 } __attribute__((aligned(8)));
254 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
255 struct bpf_list_node_kern {
256 struct list_head list_head;
258 } __attribute__((aligned(8)));
261 const struct bpf_map_ops *ops;
262 struct bpf_map *inner_map_meta;
263 #ifdef CONFIG_SECURITY
266 enum bpf_map_type map_type;
270 u64 map_extra; /* any per-map-type extra fields */
273 struct btf_record *record;
276 u32 btf_value_type_id;
277 u32 btf_vmlinux_value_type_id;
280 struct obj_cgroup *objcg;
282 char name[BPF_OBJ_NAME_LEN];
283 struct mutex freeze_mutex;
286 /* rcu is used before freeing and work is only used during freeing */
288 struct work_struct work;
292 /* 'Ownership' of program-containing map is claimed by the first program
293 * that is going to use this map or by the first program which FD is
294 * stored in the map to make sure that all callers and callees have the
295 * same prog type, JITed flag and xdp_has_frags flag.
298 const struct btf_type *attach_func_proto;
300 enum bpf_prog_type type;
305 bool frozen; /* write-once; write-protected by freeze_mutex */
306 bool free_after_mult_rcu_gp;
307 bool free_after_rcu_gp;
308 atomic64_t sleepable_refcnt;
309 s64 __percpu *elem_count;
312 static inline const char *btf_field_type_name(enum btf_field_type type)
316 return "bpf_spin_lock";
324 case BPF_KPTR_PERCPU:
325 return "percpu_kptr";
329 return "bpf_list_head";
331 return "bpf_list_node";
333 return "bpf_rb_root";
335 return "bpf_rb_node";
337 return "bpf_refcount";
344 static inline u32 btf_field_type_size(enum btf_field_type type)
348 return sizeof(struct bpf_spin_lock);
350 return sizeof(struct bpf_timer);
352 return sizeof(struct bpf_wq);
355 case BPF_KPTR_PERCPU:
359 return sizeof(struct bpf_list_head);
361 return sizeof(struct bpf_list_node);
363 return sizeof(struct bpf_rb_root);
365 return sizeof(struct bpf_rb_node);
367 return sizeof(struct bpf_refcount);
374 static inline u32 btf_field_type_align(enum btf_field_type type)
378 return __alignof__(struct bpf_spin_lock);
380 return __alignof__(struct bpf_timer);
382 return __alignof__(struct bpf_wq);
385 case BPF_KPTR_PERCPU:
387 return __alignof__(u64);
389 return __alignof__(struct bpf_list_head);
391 return __alignof__(struct bpf_list_node);
393 return __alignof__(struct bpf_rb_root);
395 return __alignof__(struct bpf_rb_node);
397 return __alignof__(struct bpf_refcount);
404 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
406 memset(addr, 0, field->size);
408 switch (field->type) {
410 refcount_set((refcount_t *)addr, 1);
413 RB_CLEAR_NODE((struct rb_node *)addr);
417 INIT_LIST_HEAD((struct list_head *)addr);
420 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
426 case BPF_KPTR_PERCPU:
435 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
437 if (IS_ERR_OR_NULL(rec))
439 return rec->field_mask & type;
442 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
446 if (IS_ERR_OR_NULL(rec))
448 for (i = 0; i < rec->cnt; i++)
449 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
452 /* 'dst' must be a temporary buffer and should not point to memory that is being
453 * used in parallel by a bpf program or bpf syscall, otherwise the access from
454 * the bpf program or bpf syscall may be corrupted by the reinitialization,
455 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
456 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
457 * program or bpf syscall.
459 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
461 bpf_obj_init(map->record, dst);
464 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
465 * forced to use 'long' read/writes to try to atomically copy long counters.
466 * Best-effort only. No barriers here, since it _will_ race with concurrent
467 * updates from BPF programs. Called from bpf syscall and mostly used with
468 * size 8 or 16 bytes, so ask compiler to inline it.
470 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
472 const long *lsrc = src;
475 size /= sizeof(long);
477 data_race(*ldst++ = *lsrc++);
480 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
481 static inline void bpf_obj_memcpy(struct btf_record *rec,
482 void *dst, void *src, u32 size,
488 if (IS_ERR_OR_NULL(rec)) {
490 bpf_long_memcpy(dst, src, round_up(size, 8));
492 memcpy(dst, src, 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 memcpy(dst + curr_off, src + curr_off, sz);
501 curr_off += rec->fields[i].size + sz;
503 memcpy(dst + curr_off, src + curr_off, size - curr_off);
506 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
508 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
511 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
513 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
516 static inline void bpf_obj_swap_uptrs(const struct btf_record *rec, void *dst, void *src)
518 unsigned long *src_uptr, *dst_uptr;
519 const struct btf_field *field;
522 if (!btf_record_has_field(rec, BPF_UPTR))
525 for (i = 0, field = rec->fields; i < rec->cnt; i++, field++) {
526 if (field->type != BPF_UPTR)
529 src_uptr = src + field->offset;
530 dst_uptr = dst + field->offset;
531 swap(*src_uptr, *dst_uptr);
535 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
540 if (IS_ERR_OR_NULL(rec)) {
541 memset(dst, 0, size);
545 for (i = 0; i < rec->cnt; i++) {
546 u32 next_off = rec->fields[i].offset;
547 u32 sz = next_off - curr_off;
549 memset(dst + curr_off, 0, sz);
550 curr_off += rec->fields[i].size + sz;
552 memset(dst + curr_off, 0, size - curr_off);
555 static inline void zero_map_value(struct bpf_map *map, void *dst)
557 bpf_obj_memzero(map->record, dst, map->value_size);
560 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
562 void bpf_timer_cancel_and_free(void *timer);
563 void bpf_wq_cancel_and_free(void *timer);
564 void bpf_list_head_free(const struct btf_field *field, void *list_head,
565 struct bpf_spin_lock *spin_lock);
566 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
567 struct bpf_spin_lock *spin_lock);
568 u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena);
569 u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena);
570 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
572 struct bpf_offload_dev;
573 struct bpf_offloaded_map;
575 struct bpf_map_dev_ops {
576 int (*map_get_next_key)(struct bpf_offloaded_map *map,
577 void *key, void *next_key);
578 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
579 void *key, void *value);
580 int (*map_update_elem)(struct bpf_offloaded_map *map,
581 void *key, void *value, u64 flags);
582 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
585 struct bpf_offloaded_map {
587 struct net_device *netdev;
588 const struct bpf_map_dev_ops *dev_ops;
590 struct list_head offloads;
593 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
595 return container_of(map, struct bpf_offloaded_map, map);
598 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
600 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
603 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
605 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
606 map->ops->map_seq_show_elem;
609 int map_check_no_btf(const struct bpf_map *map,
610 const struct btf *btf,
611 const struct btf_type *key_type,
612 const struct btf_type *value_type);
614 bool bpf_map_meta_equal(const struct bpf_map *meta0,
615 const struct bpf_map *meta1);
617 extern const struct bpf_map_ops bpf_map_offload_ops;
619 /* bpf_type_flag contains a set of flags that are applicable to the values of
620 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
621 * or a memory is read-only. We classify types into two categories: base types
622 * and extended types. Extended types are base types combined with a type flag.
624 * Currently there are no more than 32 base types in arg_type, ret_type and
627 #define BPF_BASE_TYPE_BITS 8
630 /* PTR may be NULL. */
631 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
633 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
634 * compatible with both mutable and immutable memory.
636 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
638 /* MEM points to BPF ring buffer reservation. */
639 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
641 /* MEM is in user address space. */
642 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
644 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
645 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
646 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
647 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
648 * to the specified cpu.
650 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
652 /* Indicates that the argument will be released. */
653 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
655 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
656 * unreferenced and referenced kptr loaded from map value using a load
657 * instruction, so that they can only be dereferenced but not escape the
658 * BPF program into the kernel (i.e. cannot be passed as arguments to
659 * kfunc or bpf helpers).
661 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
663 /* MEM can be uninitialized. */
664 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
666 /* DYNPTR points to memory local to the bpf program. */
667 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
669 /* DYNPTR points to a kernel-produced ringbuf record. */
670 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
672 /* Size is known at compile time. */
673 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
675 /* MEM is of an allocated object of type in program BTF. This is used to
676 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
678 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
680 /* PTR was passed from the kernel in a trusted context, and may be
681 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
682 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
683 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
684 * without invoking bpf_kptr_xchg(). What we really need to know is
685 * whether a pointer is safe to pass to a kfunc or BPF helper function.
686 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
687 * helpers, they do not cover all possible instances of unsafe
688 * pointers. For example, a pointer that was obtained from walking a
689 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
690 * fact that it may be NULL, invalid, etc. This is due to backwards
691 * compatibility requirements, as this was the behavior that was first
692 * introduced when kptrs were added. The behavior is now considered
693 * deprecated, and PTR_UNTRUSTED will eventually be removed.
695 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
696 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
697 * For example, pointers passed to tracepoint arguments are considered
698 * PTR_TRUSTED, as are pointers that are passed to struct_ops
699 * callbacks. As alluded to above, pointers that are obtained from
700 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
701 * struct task_struct *task is PTR_TRUSTED, then accessing
702 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
703 * in a BPF register. Similarly, pointers passed to certain programs
704 * types such as kretprobes are not guaranteed to be valid, as they may
705 * for example contain an object that was recently freed.
707 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
709 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
710 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
712 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
713 * Currently only valid for linked-list and rbtree nodes. If the nodes
714 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
716 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
718 /* DYNPTR points to sk_buff */
719 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
721 /* DYNPTR points to xdp_buff */
722 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
724 /* Memory must be aligned on some architectures, used in combination with
727 MEM_ALIGNED = BIT(17 + BPF_BASE_TYPE_BITS),
729 /* MEM is being written to, often combined with MEM_UNINIT. Non-presence
730 * of MEM_WRITE means that MEM is only being read. MEM_WRITE without the
731 * MEM_UNINIT means that memory needs to be initialized since it is also
734 MEM_WRITE = BIT(18 + BPF_BASE_TYPE_BITS),
737 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
740 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
743 /* Max number of base types. */
744 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
746 /* Max number of all types. */
747 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
749 /* function argument constraints */
751 ARG_DONTCARE = 0, /* unused argument in helper function */
753 /* the following constraints used to prototype
754 * bpf_map_lookup/update/delete_elem() functions
756 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
757 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
758 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
760 /* Used to prototype bpf_memcmp() and other functions that access data
761 * on eBPF program stack
763 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
766 ARG_CONST_SIZE, /* number of bytes accessed from memory */
767 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
769 ARG_PTR_TO_CTX, /* pointer to context */
770 ARG_ANYTHING, /* any (initialized) argument is ok */
771 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
772 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
773 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
774 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
775 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
776 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
777 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
778 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
779 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
780 ARG_PTR_TO_STACK, /* pointer to stack */
781 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
782 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
783 ARG_KPTR_XCHG_DEST, /* pointer to destination that kptrs are bpf_kptr_xchg'd into */
784 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
787 /* Extended arg_types. */
788 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
789 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
790 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
791 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
792 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
793 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
794 /* Pointer to memory does not need to be initialized, since helper function
795 * fills all bytes or clears them in error case.
797 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | MEM_WRITE | ARG_PTR_TO_MEM,
798 /* Pointer to valid memory of size known at compile time. */
799 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
801 /* This must be the last entry. Its purpose is to ensure the enum is
802 * wide enough to hold the higher bits reserved for bpf_type_flag.
804 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
806 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
808 /* type of values returned from helper functions */
809 enum bpf_return_type {
810 RET_INTEGER, /* function returns integer */
811 RET_VOID, /* function doesn't return anything */
812 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
813 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
814 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
815 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
816 RET_PTR_TO_MEM, /* returns a pointer to memory */
817 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
818 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
821 /* Extended ret_types. */
822 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
823 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
824 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
825 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
826 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
827 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
828 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
829 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
831 /* This must be the last entry. Its purpose is to ensure the enum is
832 * wide enough to hold the higher bits reserved for bpf_type_flag.
834 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
836 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
838 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
839 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
840 * instructions after verifying
842 struct bpf_func_proto {
843 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
847 /* set to true if helper follows contract for llvm
848 * attribute bpf_fastcall:
849 * - void functions do not scratch r0
850 * - functions taking N arguments scratch only registers r1-rN
853 enum bpf_return_type ret_type;
856 enum bpf_arg_type arg1_type;
857 enum bpf_arg_type arg2_type;
858 enum bpf_arg_type arg3_type;
859 enum bpf_arg_type arg4_type;
860 enum bpf_arg_type arg5_type;
862 enum bpf_arg_type arg_type[5];
882 int *ret_btf_id; /* return value btf_id */
883 bool (*allowed)(const struct bpf_prog *prog);
886 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
887 * the first argument to eBPF programs.
888 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
892 enum bpf_access_type {
897 /* types of values stored in eBPF registers */
898 /* Pointer types represent:
901 * pointer + (u16) var
902 * pointer + (u16) var + imm
903 * if (range > 0) then [ptr, ptr + range - off) is safe to access
904 * if (id > 0) means that some 'var' was added
905 * if (off > 0) means that 'imm' was added
908 NOT_INIT = 0, /* nothing was written into register */
909 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
910 PTR_TO_CTX, /* reg points to bpf_context */
911 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
912 PTR_TO_MAP_VALUE, /* reg points to map element value */
913 PTR_TO_MAP_KEY, /* reg points to a map element key */
914 PTR_TO_STACK, /* reg == frame_pointer + offset */
915 PTR_TO_PACKET_META, /* skb->data - meta_len */
916 PTR_TO_PACKET, /* reg points to skb->data */
917 PTR_TO_PACKET_END, /* skb->data + headlen */
918 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
919 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
920 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
921 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
922 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
923 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
924 /* PTR_TO_BTF_ID points to a kernel struct that does not need
925 * to be null checked by the BPF program. This does not imply the
926 * pointer is _not_ null and in practice this can easily be a null
927 * pointer when reading pointer chains. The assumption is program
928 * context will handle null pointer dereference typically via fault
929 * handling. The verifier must keep this in mind and can make no
930 * assumptions about null or non-null when doing branch analysis.
931 * Further, when passed into helpers the helpers can not, without
932 * additional context, assume the value is non-null.
935 PTR_TO_MEM, /* reg points to valid memory region */
937 PTR_TO_BUF, /* reg points to a read/write buffer */
938 PTR_TO_FUNC, /* reg points to a bpf program function */
939 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
942 /* Extended reg_types. */
943 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
944 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
945 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
946 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
947 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
948 * been checked for null. Used primarily to inform the verifier
949 * an explicit null check is required for this struct.
951 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
953 /* This must be the last entry. Its purpose is to ensure the enum is
954 * wide enough to hold the higher bits reserved for bpf_type_flag.
956 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
958 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
960 /* The information passed from prog-specific *_is_valid_access
961 * back to the verifier.
963 struct bpf_insn_access_aux {
964 enum bpf_reg_type reg_type;
973 struct bpf_verifier_log *log; /* for verbose logs */
974 bool is_retval; /* is accessing function return value ? */
978 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
980 aux->ctx_field_size = size;
983 static bool bpf_is_ldimm64(const struct bpf_insn *insn)
985 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
988 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
990 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
993 struct bpf_prog_ops {
994 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
995 union bpf_attr __user *uattr);
998 struct bpf_reg_state;
999 struct bpf_verifier_ops {
1000 /* return eBPF function prototype for verification */
1001 const struct bpf_func_proto *
1002 (*get_func_proto)(enum bpf_func_id func_id,
1003 const struct bpf_prog *prog);
1005 /* return true if 'size' wide access at offset 'off' within bpf_context
1006 * with 'type' (read or write) is allowed
1008 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
1009 const struct bpf_prog *prog,
1010 struct bpf_insn_access_aux *info);
1011 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
1012 const struct bpf_prog *prog);
1013 int (*gen_epilogue)(struct bpf_insn *insn, const struct bpf_prog *prog,
1015 int (*gen_ld_abs)(const struct bpf_insn *orig,
1016 struct bpf_insn *insn_buf);
1017 u32 (*convert_ctx_access)(enum bpf_access_type type,
1018 const struct bpf_insn *src,
1019 struct bpf_insn *dst,
1020 struct bpf_prog *prog, u32 *target_size);
1021 int (*btf_struct_access)(struct bpf_verifier_log *log,
1022 const struct bpf_reg_state *reg,
1026 struct bpf_prog_offload_ops {
1027 /* verifier basic callbacks */
1028 int (*insn_hook)(struct bpf_verifier_env *env,
1029 int insn_idx, int prev_insn_idx);
1030 int (*finalize)(struct bpf_verifier_env *env);
1031 /* verifier optimization callbacks (called after .finalize) */
1032 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
1033 struct bpf_insn *insn);
1034 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
1035 /* program management callbacks */
1036 int (*prepare)(struct bpf_prog *prog);
1037 int (*translate)(struct bpf_prog *prog);
1038 void (*destroy)(struct bpf_prog *prog);
1041 struct bpf_prog_offload {
1042 struct bpf_prog *prog;
1043 struct net_device *netdev;
1044 struct bpf_offload_dev *offdev;
1046 struct list_head offloads;
1053 enum bpf_cgroup_storage_type {
1054 BPF_CGROUP_STORAGE_SHARED,
1055 BPF_CGROUP_STORAGE_PERCPU,
1056 __BPF_CGROUP_STORAGE_MAX
1059 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
1061 /* The longest tracepoint has 12 args.
1062 * See include/trace/bpf_probe.h
1064 #define MAX_BPF_FUNC_ARGS 12
1066 /* The maximum number of arguments passed through registers
1067 * a single function may have.
1069 #define MAX_BPF_FUNC_REG_ARGS 5
1071 /* The argument is a structure. */
1072 #define BTF_FMODEL_STRUCT_ARG BIT(0)
1074 /* The argument is signed. */
1075 #define BTF_FMODEL_SIGNED_ARG BIT(1)
1077 struct btf_func_model {
1081 u8 arg_size[MAX_BPF_FUNC_ARGS];
1082 u8 arg_flags[MAX_BPF_FUNC_ARGS];
1085 /* Restore arguments before returning from trampoline to let original function
1086 * continue executing. This flag is used for fentry progs when there are no
1089 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1090 /* Call original function after fentry progs, but before fexit progs.
1091 * Makes sense for fentry/fexit, normal calls and indirect calls.
1093 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
1094 /* Skip current frame and return to parent. Makes sense for fentry/fexit
1095 * programs only. Should not be used with normal calls and indirect calls.
1097 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1098 /* Store IP address of the caller on the trampoline stack,
1099 * so it's available for trampoline's programs.
1101 #define BPF_TRAMP_F_IP_ARG BIT(3)
1102 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1103 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1105 /* Get original function from stack instead of from provided direct address.
1106 * Makes sense for trampolines with fexit or fmod_ret programs.
1108 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
1110 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1111 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1113 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1115 /* Indicate that current trampoline is in a tail call context. Then, it has to
1116 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1118 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1121 * Indicate the trampoline should be suitable to receive indirect calls;
1122 * without this indirectly calling the generated code can result in #UD/#CP,
1123 * depending on the CFI options.
1125 * Used by bpf_struct_ops.
1127 * Incompatible with FENTRY usage, overloads @func_addr argument.
1129 #define BPF_TRAMP_F_INDIRECT BIT(8)
1131 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1135 #if defined(__s390x__)
1136 BPF_MAX_TRAMP_LINKS = 27,
1138 BPF_MAX_TRAMP_LINKS = 38,
1142 struct bpf_tramp_links {
1143 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1147 struct bpf_tramp_run_ctx;
1149 /* Different use cases for BPF trampoline:
1150 * 1. replace nop at the function entry (kprobe equivalent)
1151 * flags = BPF_TRAMP_F_RESTORE_REGS
1152 * fentry = a set of programs to run before returning from trampoline
1154 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1155 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1156 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1157 * fentry = a set of program to run before calling original function
1158 * fexit = a set of program to run after original function
1160 * 3. replace direct call instruction anywhere in the function body
1161 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1163 * fentry = a set of programs to run before returning from trampoline
1164 * With flags = BPF_TRAMP_F_CALL_ORIG
1165 * orig_call = original callback addr or direct function addr
1166 * fentry = a set of program to run before calling original function
1167 * fexit = a set of program to run after original function
1169 struct bpf_tramp_image;
1170 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,
1171 const struct btf_func_model *m, u32 flags,
1172 struct bpf_tramp_links *tlinks,
1174 void *arch_alloc_bpf_trampoline(unsigned int size);
1175 void arch_free_bpf_trampoline(void *image, unsigned int size);
1176 int __must_check arch_protect_bpf_trampoline(void *image, unsigned int size);
1177 int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
1178 struct bpf_tramp_links *tlinks, void *func_addr);
1180 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1181 struct bpf_tramp_run_ctx *run_ctx);
1182 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1183 struct bpf_tramp_run_ctx *run_ctx);
1184 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1185 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1186 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1187 struct bpf_tramp_run_ctx *run_ctx);
1188 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1189 struct bpf_tramp_run_ctx *run_ctx);
1190 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1191 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1194 unsigned long start;
1196 char name[KSYM_NAME_LEN];
1197 struct list_head lnode;
1198 struct latch_tree_node tnode;
1202 enum bpf_tramp_prog_type {
1205 BPF_TRAMP_MODIFY_RETURN,
1207 BPF_TRAMP_REPLACE, /* more than MAX */
1210 struct bpf_tramp_image {
1213 struct bpf_ksym ksym;
1214 struct percpu_ref pcref;
1215 void *ip_after_call;
1218 struct rcu_head rcu;
1219 struct work_struct work;
1223 struct bpf_trampoline {
1224 /* hlist for trampoline_table */
1225 struct hlist_node hlist;
1226 struct ftrace_ops *fops;
1227 /* serializes access to fields of this trampoline */
1233 struct btf_func_model model;
1235 bool ftrace_managed;
1237 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1238 * program by replacing one of its functions. func.addr is the address
1239 * of the function it replaced.
1241 struct bpf_prog *extension_prog;
1242 /* list of BPF programs using this trampoline */
1243 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1244 /* Number of attached programs. A counter per kind. */
1245 int progs_cnt[BPF_TRAMP_MAX];
1246 /* Executable image of trampoline */
1247 struct bpf_tramp_image *cur_image;
1250 struct bpf_attach_target_info {
1251 struct btf_func_model fmodel;
1253 struct module *tgt_mod;
1254 const char *tgt_name;
1255 const struct btf_type *tgt_type;
1258 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1260 struct bpf_dispatcher_prog {
1261 struct bpf_prog *prog;
1265 struct bpf_dispatcher {
1266 /* dispatcher mutex */
1269 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1274 struct bpf_ksym ksym;
1275 #ifdef CONFIG_HAVE_STATIC_CALL
1276 struct static_call_key *sc_key;
1282 #define __bpfcall __nocfi
1285 static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func(
1287 const struct bpf_insn *insnsi,
1288 bpf_func_t bpf_func)
1290 return bpf_func(ctx, insnsi);
1293 /* the implementation of the opaque uapi struct bpf_dynptr */
1294 struct bpf_dynptr_kern {
1296 /* Size represents the number of usable bytes of dynptr data.
1297 * If for example the offset is at 4 for a local dynptr whose data is
1298 * of type u64, the number of usable bytes is 4.
1300 * The upper 8 bits are reserved. It is as follows:
1301 * Bits 0 - 23 = size
1302 * Bits 24 - 30 = dynptr type
1303 * Bit 31 = whether dynptr is read-only
1309 enum bpf_dynptr_type {
1310 BPF_DYNPTR_TYPE_INVALID,
1311 /* Points to memory that is local to the bpf program */
1312 BPF_DYNPTR_TYPE_LOCAL,
1313 /* Underlying data is a ringbuf record */
1314 BPF_DYNPTR_TYPE_RINGBUF,
1315 /* Underlying data is a sk_buff */
1316 BPF_DYNPTR_TYPE_SKB,
1317 /* Underlying data is a xdp_buff */
1318 BPF_DYNPTR_TYPE_XDP,
1321 int bpf_dynptr_check_size(u32 size);
1322 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1323 const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
1324 void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
1325 bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
1327 #ifdef CONFIG_BPF_JIT
1328 int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1329 struct bpf_trampoline *tr,
1330 struct bpf_prog *tgt_prog);
1331 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1332 struct bpf_trampoline *tr,
1333 struct bpf_prog *tgt_prog);
1334 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1335 struct bpf_attach_target_info *tgt_info);
1336 void bpf_trampoline_put(struct bpf_trampoline *tr);
1337 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1340 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1341 * indirection with a direct call to the bpf program. If the architecture does
1342 * not have STATIC_CALL, avoid a double-indirection.
1344 #ifdef CONFIG_HAVE_STATIC_CALL
1346 #define __BPF_DISPATCHER_SC_INIT(_name) \
1347 .sc_key = &STATIC_CALL_KEY(_name), \
1348 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1350 #define __BPF_DISPATCHER_SC(name) \
1351 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1353 #define __BPF_DISPATCHER_CALL(name) \
1354 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1356 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1357 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1360 #define __BPF_DISPATCHER_SC_INIT(name)
1361 #define __BPF_DISPATCHER_SC(name)
1362 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1363 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1366 #define BPF_DISPATCHER_INIT(_name) { \
1367 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1368 .func = &_name##_func, \
1375 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1377 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1380 #define DEFINE_BPF_DISPATCHER(name) \
1381 __BPF_DISPATCHER_SC(name); \
1382 noinline __bpfcall unsigned int bpf_dispatcher_##name##_func( \
1384 const struct bpf_insn *insnsi, \
1385 bpf_func_t bpf_func) \
1387 return __BPF_DISPATCHER_CALL(name); \
1389 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1390 struct bpf_dispatcher bpf_dispatcher_##name = \
1391 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1393 #define DECLARE_BPF_DISPATCHER(name) \
1394 unsigned int bpf_dispatcher_##name##_func( \
1396 const struct bpf_insn *insnsi, \
1397 bpf_func_t bpf_func); \
1398 extern struct bpf_dispatcher bpf_dispatcher_##name;
1400 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1401 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1402 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1403 struct bpf_prog *to);
1404 /* Called only from JIT-enabled code, so there's no need for stubs. */
1405 void bpf_image_ksym_init(void *data, unsigned int size, struct bpf_ksym *ksym);
1406 void bpf_image_ksym_add(struct bpf_ksym *ksym);
1407 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1408 void bpf_ksym_add(struct bpf_ksym *ksym);
1409 void bpf_ksym_del(struct bpf_ksym *ksym);
1410 int bpf_jit_charge_modmem(u32 size);
1411 void bpf_jit_uncharge_modmem(u32 size);
1412 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1414 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1415 struct bpf_trampoline *tr,
1416 struct bpf_prog *tgt_prog)
1420 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1421 struct bpf_trampoline *tr,
1422 struct bpf_prog *tgt_prog)
1426 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1427 struct bpf_attach_target_info *tgt_info)
1431 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1432 #define DEFINE_BPF_DISPATCHER(name)
1433 #define DECLARE_BPF_DISPATCHER(name)
1434 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1435 #define BPF_DISPATCHER_PTR(name) NULL
1436 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1437 struct bpf_prog *from,
1438 struct bpf_prog *to) {}
1439 static inline bool is_bpf_image_address(unsigned long address)
1443 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1449 struct bpf_func_info_aux {
1456 enum bpf_jit_poke_reason {
1457 BPF_POKE_REASON_TAIL_CALL,
1460 /* Descriptor of pokes pointing /into/ the JITed image. */
1461 struct bpf_jit_poke_descriptor {
1462 void *tailcall_target;
1463 void *tailcall_bypass;
1468 struct bpf_map *map;
1472 bool tailcall_target_stable;
1478 /* reg_type info for ctx arguments */
1479 struct bpf_ctx_arg_aux {
1481 enum bpf_reg_type reg_type;
1486 struct btf_mod_pair {
1488 struct module *module;
1491 struct bpf_kfunc_desc_tab;
1493 struct bpf_prog_aux {
1502 u32 func_cnt; /* used by non-func prog as the number of func progs */
1503 u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */
1504 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1505 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1506 u32 ctx_arg_info_size;
1507 u32 max_rdonly_access;
1508 u32 max_rdwr_access;
1509 struct btf *attach_btf;
1510 const struct bpf_ctx_arg_aux *ctx_arg_info;
1511 void __percpu *priv_stack_ptr;
1512 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1513 struct bpf_prog *dst_prog;
1514 struct bpf_trampoline *dst_trampoline;
1515 enum bpf_prog_type saved_dst_prog_type;
1516 enum bpf_attach_type saved_dst_attach_type;
1517 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1518 bool dev_bound; /* Program is bound to the netdev. */
1519 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1520 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1521 bool attach_tracing_prog; /* true if tracing another tracing program */
1522 bool func_proto_unreliable;
1523 bool tail_call_reachable;
1526 bool exception_boundary;
1527 bool is_extended; /* true if extended by freplace program */
1528 bool jits_use_priv_stack;
1529 bool priv_stack_requested;
1530 bool changes_pkt_data;
1531 u64 prog_array_member_cnt; /* counts how many times as member of prog_array */
1532 struct mutex ext_mutex; /* mutex for is_extended and prog_array_member_cnt */
1533 struct bpf_arena *arena;
1534 void (*recursion_detected)(struct bpf_prog *prog); /* callback if recursion is detected */
1535 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1536 const struct btf_type *attach_func_proto;
1537 /* function name for valid attach_btf_id */
1538 const char *attach_func_name;
1539 struct bpf_prog **func;
1540 void *jit_data; /* JIT specific data. arch dependent */
1541 struct bpf_jit_poke_descriptor *poke_tab;
1542 struct bpf_kfunc_desc_tab *kfunc_tab;
1543 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1545 #ifdef CONFIG_FINEIBT
1546 struct bpf_ksym ksym_prefix;
1548 struct bpf_ksym ksym;
1549 const struct bpf_prog_ops *ops;
1550 struct bpf_map **used_maps;
1551 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1552 struct btf_mod_pair *used_btfs;
1553 struct bpf_prog *prog;
1554 struct user_struct *user;
1555 u64 load_time; /* ns since boottime */
1557 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1558 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1559 char name[BPF_OBJ_NAME_LEN];
1560 u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64);
1561 #ifdef CONFIG_SECURITY
1564 struct bpf_token *token;
1565 struct bpf_prog_offload *offload;
1567 struct bpf_func_info *func_info;
1568 struct bpf_func_info_aux *func_info_aux;
1569 /* bpf_line_info loaded from userspace. linfo->insn_off
1570 * has the xlated insn offset.
1571 * Both the main and sub prog share the same linfo.
1572 * The subprog can access its first linfo by
1573 * using the linfo_idx.
1575 struct bpf_line_info *linfo;
1576 /* jited_linfo is the jited addr of the linfo. It has a
1577 * one to one mapping to linfo:
1578 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1579 * Both the main and sub prog share the same jited_linfo.
1580 * The subprog can access its first jited_linfo by
1581 * using the linfo_idx.
1586 /* subprog can use linfo_idx to access its first linfo and
1588 * main prog always has linfo_idx == 0
1593 struct exception_table_entry *extable;
1595 struct work_struct work;
1596 struct rcu_head rcu;
1601 u16 pages; /* Number of allocated pages */
1602 u16 jited:1, /* Is our filter JIT'ed? */
1603 jit_requested:1,/* archs need to JIT the prog */
1604 gpl_compatible:1, /* Is filter GPL compatible? */
1605 cb_access:1, /* Is control block accessed? */
1606 dst_needed:1, /* Do we need dst entry? */
1607 blinding_requested:1, /* needs constant blinding */
1608 blinded:1, /* Was blinded */
1609 is_func:1, /* program is a bpf function */
1610 kprobe_override:1, /* Do we override a kprobe? */
1611 has_callchain_buf:1, /* callchain buffer allocated? */
1612 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1613 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1614 call_get_func_ip:1, /* Do we call get_func_ip() */
1615 tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */
1616 sleepable:1; /* BPF program is sleepable */
1617 enum bpf_prog_type type; /* Type of BPF program */
1618 enum bpf_attach_type expected_attach_type; /* For some prog types */
1619 u32 len; /* Number of filter blocks */
1620 u32 jited_len; /* Size of jited insns in bytes */
1621 u8 tag[BPF_TAG_SIZE];
1622 struct bpf_prog_stats __percpu *stats;
1623 int __percpu *active;
1624 unsigned int (*bpf_func)(const void *ctx,
1625 const struct bpf_insn *insn);
1626 struct bpf_prog_aux *aux; /* Auxiliary fields */
1627 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1628 /* Instructions for interpreter */
1630 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1631 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1635 struct bpf_array_aux {
1636 /* Programs with direct jumps into programs part of this array. */
1637 struct list_head poke_progs;
1638 struct bpf_map *map;
1639 struct mutex poke_mutex;
1640 struct work_struct work;
1646 enum bpf_link_type type;
1647 const struct bpf_link_ops *ops;
1648 struct bpf_prog *prog;
1649 /* whether BPF link itself has "sleepable" semantics, which can differ
1650 * from underlying BPF program having a "sleepable" semantics, as BPF
1651 * link's semantics is determined by target attach hook
1654 /* rcu is used before freeing, work can be used to schedule that
1655 * RCU-based freeing before that, so they never overlap
1658 struct rcu_head rcu;
1659 struct work_struct work;
1663 struct bpf_link_ops {
1664 void (*release)(struct bpf_link *link);
1665 /* deallocate link resources callback, called without RCU grace period
1668 void (*dealloc)(struct bpf_link *link);
1669 /* deallocate link resources callback, called after RCU grace period;
1670 * if either the underlying BPF program is sleepable or BPF link's
1671 * target hook is sleepable, we'll go through tasks trace RCU GP and
1672 * then "classic" RCU GP; this need for chaining tasks trace and
1673 * classic RCU GPs is designated by setting bpf_link->sleepable flag
1675 void (*dealloc_deferred)(struct bpf_link *link);
1676 int (*detach)(struct bpf_link *link);
1677 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1678 struct bpf_prog *old_prog);
1679 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1680 int (*fill_link_info)(const struct bpf_link *link,
1681 struct bpf_link_info *info);
1682 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1683 struct bpf_map *old_map);
1684 __poll_t (*poll)(struct file *file, struct poll_table_struct *pts);
1687 struct bpf_tramp_link {
1688 struct bpf_link link;
1689 struct hlist_node tramp_hlist;
1693 struct bpf_shim_tramp_link {
1694 struct bpf_tramp_link link;
1695 struct bpf_trampoline *trampoline;
1698 struct bpf_tracing_link {
1699 struct bpf_tramp_link link;
1700 enum bpf_attach_type attach_type;
1701 struct bpf_trampoline *trampoline;
1702 struct bpf_prog *tgt_prog;
1705 struct bpf_raw_tp_link {
1706 struct bpf_link link;
1707 struct bpf_raw_event_map *btp;
1711 struct bpf_link_primer {
1712 struct bpf_link *link;
1718 struct bpf_mount_opts {
1723 /* BPF token-related delegation options */
1727 u64 delegate_attachs;
1731 struct work_struct work;
1733 struct user_namespace *userns;
1737 u64 allowed_attachs;
1738 #ifdef CONFIG_SECURITY
1743 struct bpf_struct_ops_value;
1746 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1748 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1749 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1750 * of BPF_PROG_TYPE_STRUCT_OPS progs.
1751 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1752 * when determining whether the struct_ops progs in the
1753 * struct_ops map are valid.
1754 * @init: A callback that is invoked a single time, and before any other
1755 * callback, to initialize the structure. A nonzero return value means
1756 * the subsystem could not be initialized.
1757 * @check_member: When defined, a callback invoked by the verifier to allow
1758 * the subsystem to determine if an entry in the struct_ops map
1759 * is valid. A nonzero return value means that the map is
1760 * invalid and should be rejected by the verifier.
1761 * @init_member: A callback that is invoked for each member of the struct_ops
1762 * map to allow the subsystem to initialize the member. A nonzero
1763 * value means the member could not be initialized. This callback
1764 * is exclusive with the @type, @type_id, @value_type, and
1766 * @reg: A callback that is invoked when the struct_ops map has been
1767 * initialized and is being attached to. Zero means the struct_ops map
1768 * has been successfully registered and is live. A nonzero return value
1769 * means the struct_ops map could not be registered.
1770 * @unreg: A callback that is invoked when the struct_ops map should be
1772 * @update: A callback that is invoked when the live struct_ops map is being
1773 * updated to contain new values. This callback is only invoked when
1774 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1775 * it is assumed that the struct_ops map cannot be updated.
1776 * @validate: A callback that is invoked after all of the members have been
1777 * initialized. This callback should perform static checks on the
1778 * map, meaning that it should either fail or succeed
1779 * deterministically. A struct_ops map that has been validated may
1780 * not necessarily succeed in being registered if the call to @reg
1781 * fails. For example, a valid struct_ops map may be loaded, but
1782 * then fail to be registered due to there being another active
1783 * struct_ops map on the system in the subsystem already. For this
1784 * reason, if this callback is not defined, the check is skipped as
1785 * the struct_ops map will have final verification performed in
1788 * @value_type: Value type.
1789 * @name: The name of the struct bpf_struct_ops object.
1790 * @func_models: Func models
1791 * @type_id: BTF type id.
1792 * @value_id: BTF value id.
1794 struct bpf_struct_ops {
1795 const struct bpf_verifier_ops *verifier_ops;
1796 int (*init)(struct btf *btf);
1797 int (*check_member)(const struct btf_type *t,
1798 const struct btf_member *member,
1799 const struct bpf_prog *prog);
1800 int (*init_member)(const struct btf_type *t,
1801 const struct btf_member *member,
1802 void *kdata, const void *udata);
1803 int (*reg)(void *kdata, struct bpf_link *link);
1804 void (*unreg)(void *kdata, struct bpf_link *link);
1805 int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);
1806 int (*validate)(void *kdata);
1808 struct module *owner;
1810 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1813 /* Every member of a struct_ops type has an instance even a member is not
1814 * an operator (function pointer). The "info" field will be assigned to
1815 * prog->aux->ctx_arg_info of BPF struct_ops programs to provide the
1816 * argument information required by the verifier to verify the program.
1818 * btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the
1819 * corresponding entry for an given argument.
1821 struct bpf_struct_ops_arg_info {
1822 struct bpf_ctx_arg_aux *info;
1826 struct bpf_struct_ops_desc {
1827 struct bpf_struct_ops *st_ops;
1829 const struct btf_type *type;
1830 const struct btf_type *value_type;
1834 /* Collection of argument information for each member */
1835 struct bpf_struct_ops_arg_info *arg_info;
1838 enum bpf_struct_ops_state {
1839 BPF_STRUCT_OPS_STATE_INIT,
1840 BPF_STRUCT_OPS_STATE_INUSE,
1841 BPF_STRUCT_OPS_STATE_TOBEFREE,
1842 BPF_STRUCT_OPS_STATE_READY,
1845 struct bpf_struct_ops_common_value {
1847 enum bpf_struct_ops_state state;
1850 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1851 /* This macro helps developer to register a struct_ops type and generate
1852 * type information correctly. Developers should use this macro to register
1853 * a struct_ops type instead of calling __register_bpf_struct_ops() directly.
1855 #define register_bpf_struct_ops(st_ops, type) \
1857 struct bpf_struct_ops_##type { \
1858 struct bpf_struct_ops_common_value common; \
1859 struct type data ____cacheline_aligned_in_smp; \
1861 BTF_TYPE_EMIT(struct bpf_struct_ops_##type); \
1862 __register_bpf_struct_ops(st_ops); \
1864 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1865 bool bpf_struct_ops_get(const void *kdata);
1866 void bpf_struct_ops_put(const void *kdata);
1867 int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff);
1868 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1870 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1871 struct bpf_tramp_link *link,
1872 const struct btf_func_model *model,
1874 void **image, u32 *image_off,
1876 void bpf_struct_ops_image_free(void *image);
1877 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1879 if (owner == BPF_MODULE_OWNER)
1880 return bpf_struct_ops_get(data);
1882 return try_module_get(owner);
1884 static inline void bpf_module_put(const void *data, struct module *owner)
1886 if (owner == BPF_MODULE_OWNER)
1887 bpf_struct_ops_put(data);
1891 int bpf_struct_ops_link_create(union bpf_attr *attr);
1894 /* Define it here to avoid the use of forward declaration */
1895 struct bpf_dummy_ops_state {
1899 struct bpf_dummy_ops {
1900 int (*test_1)(struct bpf_dummy_ops_state *cb);
1901 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1902 char a3, unsigned long a4);
1903 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1906 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1907 union bpf_attr __user *uattr);
1909 int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
1911 struct bpf_verifier_log *log);
1912 void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1913 void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc);
1915 #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
1916 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1918 return try_module_get(owner);
1920 static inline void bpf_module_put(const void *data, struct module *owner)
1924 static inline int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)
1928 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1934 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1938 static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map)
1942 static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc)
1948 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1949 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1951 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1953 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1958 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1967 struct bpf_array_aux *aux;
1969 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1970 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1971 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1975 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1976 #define MAX_TAIL_CALL_CNT 33
1978 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1979 * It's enum to expose it (and thus make it discoverable) through BTF.
1982 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1985 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1986 BPF_F_RDONLY_PROG | \
1990 #define BPF_MAP_CAN_READ BIT(0)
1991 #define BPF_MAP_CAN_WRITE BIT(1)
1993 /* Maximum number of user-producer ring buffer samples that can be drained in
1994 * a call to bpf_user_ringbuf_drain().
1996 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1998 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
2000 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2002 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
2005 if (access_flags & BPF_F_RDONLY_PROG)
2006 return BPF_MAP_CAN_READ;
2007 else if (access_flags & BPF_F_WRONLY_PROG)
2008 return BPF_MAP_CAN_WRITE;
2010 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
2013 static inline bool bpf_map_flags_access_ok(u32 access_flags)
2015 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
2016 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2019 struct bpf_event_entry {
2020 struct perf_event *event;
2021 struct file *perf_file;
2022 struct file *map_file;
2023 struct rcu_head rcu;
2026 static inline bool map_type_contains_progs(struct bpf_map *map)
2028 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
2029 map->map_type == BPF_MAP_TYPE_DEVMAP ||
2030 map->map_type == BPF_MAP_TYPE_CPUMAP;
2033 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
2034 int bpf_prog_calc_tag(struct bpf_prog *fp);
2036 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
2037 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
2039 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
2040 unsigned long off, unsigned long len);
2041 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
2042 const struct bpf_insn *src,
2043 struct bpf_insn *dst,
2044 struct bpf_prog *prog,
2047 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
2048 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
2050 /* an array of programs to be executed under rcu_lock.
2053 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
2055 * the structure returned by bpf_prog_array_alloc() should be populated
2056 * with program pointers and the last pointer must be NULL.
2057 * The user has to keep refcnt on the program and make sure the program
2058 * is removed from the array before bpf_prog_put().
2059 * The 'struct bpf_prog_array *' should only be replaced with xchg()
2060 * since other cpus are walking the array of pointers in parallel.
2062 struct bpf_prog_array_item {
2063 struct bpf_prog *prog;
2065 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
2070 struct bpf_prog_array {
2071 struct rcu_head rcu;
2072 struct bpf_prog_array_item items[];
2075 struct bpf_empty_prog_array {
2076 struct bpf_prog_array hdr;
2077 struct bpf_prog *null_prog;
2080 /* to avoid allocating empty bpf_prog_array for cgroups that
2081 * don't have bpf program attached use one global 'bpf_empty_prog_array'
2082 * It will not be modified the caller of bpf_prog_array_alloc()
2083 * (since caller requested prog_cnt == 0)
2084 * that pointer should be 'freed' by bpf_prog_array_free()
2086 extern struct bpf_empty_prog_array bpf_empty_prog_array;
2088 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
2089 void bpf_prog_array_free(struct bpf_prog_array *progs);
2090 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
2091 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
2092 int bpf_prog_array_length(struct bpf_prog_array *progs);
2093 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
2094 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
2095 __u32 __user *prog_ids, u32 cnt);
2097 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
2098 struct bpf_prog *old_prog);
2099 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
2100 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
2101 struct bpf_prog *prog);
2102 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
2103 u32 *prog_ids, u32 request_cnt,
2105 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
2106 struct bpf_prog *exclude_prog,
2107 struct bpf_prog *include_prog,
2109 struct bpf_prog_array **new_array);
2111 struct bpf_run_ctx {};
2113 struct bpf_cg_run_ctx {
2114 struct bpf_run_ctx run_ctx;
2115 const struct bpf_prog_array_item *prog_item;
2119 struct bpf_trace_run_ctx {
2120 struct bpf_run_ctx run_ctx;
2125 struct bpf_tramp_run_ctx {
2126 struct bpf_run_ctx run_ctx;
2128 struct bpf_run_ctx *saved_run_ctx;
2131 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
2133 struct bpf_run_ctx *old_ctx = NULL;
2135 #ifdef CONFIG_BPF_SYSCALL
2136 old_ctx = current->bpf_ctx;
2137 current->bpf_ctx = new_ctx;
2142 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
2144 #ifdef CONFIG_BPF_SYSCALL
2145 current->bpf_ctx = old_ctx;
2149 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
2150 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
2151 /* BPF program asks to set CN on the packet. */
2152 #define BPF_RET_SET_CN (1 << 0)
2154 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
2156 static __always_inline u32
2157 bpf_prog_run_array(const struct bpf_prog_array *array,
2158 const void *ctx, bpf_prog_run_fn run_prog)
2160 const struct bpf_prog_array_item *item;
2161 const struct bpf_prog *prog;
2162 struct bpf_run_ctx *old_run_ctx;
2163 struct bpf_trace_run_ctx run_ctx;
2166 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
2168 if (unlikely(!array))
2171 run_ctx.is_uprobe = false;
2174 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2175 item = &array->items[0];
2176 while ((prog = READ_ONCE(item->prog))) {
2177 run_ctx.bpf_cookie = item->bpf_cookie;
2178 ret &= run_prog(prog, ctx);
2181 bpf_reset_run_ctx(old_run_ctx);
2186 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
2188 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
2189 * overall. As a result, we must use the bpf_prog_array_free_sleepable
2190 * in order to use the tasks_trace rcu grace period.
2192 * When a non-sleepable program is inside the array, we take the rcu read
2193 * section and disable preemption for that program alone, so it can access
2194 * rcu-protected dynamically sized maps.
2196 static __always_inline u32
2197 bpf_prog_run_array_uprobe(const struct bpf_prog_array *array,
2198 const void *ctx, bpf_prog_run_fn run_prog)
2200 const struct bpf_prog_array_item *item;
2201 const struct bpf_prog *prog;
2202 struct bpf_run_ctx *old_run_ctx;
2203 struct bpf_trace_run_ctx run_ctx;
2207 RCU_LOCKDEP_WARN(!rcu_read_lock_trace_held(), "no rcu lock held");
2209 if (unlikely(!array))
2214 run_ctx.is_uprobe = true;
2216 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2217 item = &array->items[0];
2218 while ((prog = READ_ONCE(item->prog))) {
2219 if (!prog->sleepable)
2222 run_ctx.bpf_cookie = item->bpf_cookie;
2223 ret &= run_prog(prog, ctx);
2226 if (!prog->sleepable)
2229 bpf_reset_run_ctx(old_run_ctx);
2234 #ifdef CONFIG_BPF_SYSCALL
2235 DECLARE_PER_CPU(int, bpf_prog_active);
2236 extern struct mutex bpf_stats_enabled_mutex;
2239 * Block execution of BPF programs attached to instrumentation (perf,
2240 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2241 * these events can happen inside a region which holds a map bucket lock
2242 * and can deadlock on it.
2244 static inline void bpf_disable_instrumentation(void)
2247 this_cpu_inc(bpf_prog_active);
2250 static inline void bpf_enable_instrumentation(void)
2252 this_cpu_dec(bpf_prog_active);
2256 extern const struct super_operations bpf_super_ops;
2257 extern const struct file_operations bpf_map_fops;
2258 extern const struct file_operations bpf_prog_fops;
2259 extern const struct file_operations bpf_iter_fops;
2261 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2262 extern const struct bpf_prog_ops _name ## _prog_ops; \
2263 extern const struct bpf_verifier_ops _name ## _verifier_ops;
2264 #define BPF_MAP_TYPE(_id, _ops) \
2265 extern const struct bpf_map_ops _ops;
2266 #define BPF_LINK_TYPE(_id, _name)
2267 #include <linux/bpf_types.h>
2268 #undef BPF_PROG_TYPE
2270 #undef BPF_LINK_TYPE
2272 extern const struct bpf_prog_ops bpf_offload_prog_ops;
2273 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2274 extern const struct bpf_verifier_ops xdp_analyzer_ops;
2276 struct bpf_prog *bpf_prog_get(u32 ufd);
2277 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2279 void bpf_prog_add(struct bpf_prog *prog, int i);
2280 void bpf_prog_sub(struct bpf_prog *prog, int i);
2281 void bpf_prog_inc(struct bpf_prog *prog);
2282 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2283 void bpf_prog_put(struct bpf_prog *prog);
2285 void bpf_prog_free_id(struct bpf_prog *prog);
2286 void bpf_map_free_id(struct bpf_map *map);
2288 struct btf_field *btf_record_find(const struct btf_record *rec,
2289 u32 offset, u32 field_mask);
2290 void btf_record_free(struct btf_record *rec);
2291 void bpf_map_free_record(struct bpf_map *map);
2292 struct btf_record *btf_record_dup(const struct btf_record *rec);
2293 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2294 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2295 void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);
2296 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2297 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);
2299 struct bpf_map *bpf_map_get(u32 ufd);
2300 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2302 static inline struct bpf_map *__bpf_map_get(struct fd f)
2305 return ERR_PTR(-EBADF);
2306 if (unlikely(fd_file(f)->f_op != &bpf_map_fops))
2307 return ERR_PTR(-EINVAL);
2308 return fd_file(f)->private_data;
2311 void bpf_map_inc(struct bpf_map *map);
2312 void bpf_map_inc_with_uref(struct bpf_map *map);
2313 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2314 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2315 void bpf_map_put_with_uref(struct bpf_map *map);
2316 void bpf_map_put(struct bpf_map *map);
2317 void *bpf_map_area_alloc(u64 size, int numa_node);
2318 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2319 void bpf_map_area_free(void *base);
2320 bool bpf_map_write_active(const struct bpf_map *map);
2321 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2322 int generic_map_lookup_batch(struct bpf_map *map,
2323 const union bpf_attr *attr,
2324 union bpf_attr __user *uattr);
2325 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2326 const union bpf_attr *attr,
2327 union bpf_attr __user *uattr);
2328 int generic_map_delete_batch(struct bpf_map *map,
2329 const union bpf_attr *attr,
2330 union bpf_attr __user *uattr);
2331 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2332 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2334 int bpf_map_alloc_pages(const struct bpf_map *map, gfp_t gfp, int nid,
2335 unsigned long nr_pages, struct page **page_array);
2337 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2339 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2340 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2342 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2343 size_t align, gfp_t flags);
2346 * These specialized allocators have to be macros for their allocations to be
2347 * accounted separately (to have separate alloc_tag).
2349 #define bpf_map_kmalloc_node(_map, _size, _flags, _node) \
2350 kmalloc_node(_size, _flags, _node)
2351 #define bpf_map_kzalloc(_map, _size, _flags) \
2352 kzalloc(_size, _flags)
2353 #define bpf_map_kvcalloc(_map, _n, _size, _flags) \
2354 kvcalloc(_n, _size, _flags)
2355 #define bpf_map_alloc_percpu(_map, _size, _align, _flags) \
2356 __alloc_percpu_gfp(_size, _align, _flags)
2360 bpf_map_init_elem_count(struct bpf_map *map)
2362 size_t size = sizeof(*map->elem_count), align = size;
2363 gfp_t flags = GFP_USER | __GFP_NOWARN;
2365 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2366 if (!map->elem_count)
2373 bpf_map_free_elem_count(struct bpf_map *map)
2375 free_percpu(map->elem_count);
2378 static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2380 this_cpu_inc(*map->elem_count);
2383 static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2385 this_cpu_dec(*map->elem_count);
2388 extern int sysctl_unprivileged_bpf_disabled;
2390 bool bpf_token_capable(const struct bpf_token *token, int cap);
2392 static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token)
2394 return bpf_token_capable(token, CAP_PERFMON);
2397 static inline bool bpf_allow_uninit_stack(const struct bpf_token *token)
2399 return bpf_token_capable(token, CAP_PERFMON);
2402 static inline bool bpf_bypass_spec_v1(const struct bpf_token *token)
2404 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
2407 static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)
2409 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
2412 int bpf_map_new_fd(struct bpf_map *map, int flags);
2413 int bpf_prog_new_fd(struct bpf_prog *prog);
2415 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2416 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2417 void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
2418 const struct bpf_link_ops *ops, struct bpf_prog *prog,
2420 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2421 int bpf_link_settle(struct bpf_link_primer *primer);
2422 void bpf_link_cleanup(struct bpf_link_primer *primer);
2423 void bpf_link_inc(struct bpf_link *link);
2424 struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
2425 void bpf_link_put(struct bpf_link *link);
2426 int bpf_link_new_fd(struct bpf_link *link);
2427 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2428 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2430 void bpf_token_inc(struct bpf_token *token);
2431 void bpf_token_put(struct bpf_token *token);
2432 int bpf_token_create(union bpf_attr *attr);
2433 struct bpf_token *bpf_token_get_from_fd(u32 ufd);
2435 bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
2436 bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type);
2437 bool bpf_token_allow_prog_type(const struct bpf_token *token,
2438 enum bpf_prog_type prog_type,
2439 enum bpf_attach_type attach_type);
2441 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2442 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2443 struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir,
2446 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2447 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2448 extern int bpf_iter_ ## target(args); \
2449 int __init bpf_iter_ ## target(args) { return 0; }
2452 * The task type of iterators.
2454 * For BPF task iterators, they can be parameterized with various
2455 * parameters to visit only some of tasks.
2457 * BPF_TASK_ITER_ALL (default)
2458 * Iterate over resources of every task.
2461 * Iterate over resources of a task/tid.
2463 * BPF_TASK_ITER_TGID
2464 * Iterate over resources of every task of a process / task group.
2466 enum bpf_iter_task_type {
2467 BPF_TASK_ITER_ALL = 0,
2472 struct bpf_iter_aux_info {
2473 /* for map_elem iter */
2474 struct bpf_map *map;
2476 /* for cgroup iter */
2478 struct cgroup *start; /* starting cgroup */
2479 enum bpf_cgroup_iter_order order;
2482 enum bpf_iter_task_type type;
2487 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2488 union bpf_iter_link_info *linfo,
2489 struct bpf_iter_aux_info *aux);
2490 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2491 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2492 struct seq_file *seq);
2493 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2494 struct bpf_link_info *info);
2495 typedef const struct bpf_func_proto *
2496 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2497 const struct bpf_prog *prog);
2499 enum bpf_iter_feature {
2500 BPF_ITER_RESCHED = BIT(0),
2503 #define BPF_ITER_CTX_ARG_MAX 2
2504 struct bpf_iter_reg {
2506 bpf_iter_attach_target_t attach_target;
2507 bpf_iter_detach_target_t detach_target;
2508 bpf_iter_show_fdinfo_t show_fdinfo;
2509 bpf_iter_fill_link_info_t fill_link_info;
2510 bpf_iter_get_func_proto_t get_func_proto;
2511 u32 ctx_arg_info_size;
2513 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2514 const struct bpf_iter_seq_info *seq_info;
2517 struct bpf_iter_meta {
2518 __bpf_md_ptr(struct seq_file *, seq);
2523 struct bpf_iter__bpf_map_elem {
2524 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2525 __bpf_md_ptr(struct bpf_map *, map);
2526 __bpf_md_ptr(void *, key);
2527 __bpf_md_ptr(void *, value);
2530 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2531 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2532 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2533 const struct bpf_func_proto *
2534 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2535 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2536 int bpf_iter_new_fd(struct bpf_link *link);
2537 bool bpf_link_is_iter(struct bpf_link *link);
2538 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2539 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2540 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2541 struct seq_file *seq);
2542 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2543 struct bpf_link_info *info);
2545 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2546 struct bpf_func_state *caller,
2547 struct bpf_func_state *callee);
2549 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2550 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2551 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2553 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2556 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2558 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2559 void *key, void *value, u64 map_flags);
2560 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2561 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2562 void *key, void *value, u64 map_flags);
2563 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2565 int bpf_get_file_flag(int flags);
2566 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2567 size_t actual_size);
2569 /* verify correctness of eBPF program */
2570 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2572 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2573 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2576 struct btf *bpf_get_btf_vmlinux(void);
2581 struct bpf_dtab_netdev;
2582 struct bpf_cpu_map_entry;
2584 void __dev_flush(struct list_head *flush_list);
2585 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2586 struct net_device *dev_rx);
2587 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2588 struct net_device *dev_rx);
2589 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2590 struct bpf_map *map, bool exclude_ingress);
2591 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2592 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);
2597 void __cpu_map_flush(struct list_head *flush_list);
2598 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2599 struct net_device *dev_rx);
2600 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2601 struct sk_buff *skb);
2603 /* Return map's numa specified by userspace */
2604 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2606 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2607 attr->numa_node : NUMA_NO_NODE;
2610 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2611 int array_map_alloc_check(union bpf_attr *attr);
2613 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2614 union bpf_attr __user *uattr);
2615 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2616 union bpf_attr __user *uattr);
2617 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2618 const union bpf_attr *kattr,
2619 union bpf_attr __user *uattr);
2620 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2621 const union bpf_attr *kattr,
2622 union bpf_attr __user *uattr);
2623 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2624 const union bpf_attr *kattr,
2625 union bpf_attr __user *uattr);
2626 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2627 const union bpf_attr *kattr,
2628 union bpf_attr __user *uattr);
2629 int bpf_prog_test_run_nf(struct bpf_prog *prog,
2630 const union bpf_attr *kattr,
2631 union bpf_attr __user *uattr);
2632 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2633 const struct bpf_prog *prog,
2634 struct bpf_insn_access_aux *info);
2636 static inline bool bpf_tracing_ctx_access(int off, int size,
2637 enum bpf_access_type type)
2639 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2641 if (type != BPF_READ)
2643 if (off % size != 0)
2648 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2649 enum bpf_access_type type,
2650 const struct bpf_prog *prog,
2651 struct bpf_insn_access_aux *info)
2653 if (!bpf_tracing_ctx_access(off, size, type))
2655 return btf_ctx_access(off, size, type, prog, info);
2658 int btf_struct_access(struct bpf_verifier_log *log,
2659 const struct bpf_reg_state *reg,
2660 int off, int size, enum bpf_access_type atype,
2661 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2662 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2663 const struct btf *btf, u32 id, int off,
2664 const struct btf *need_btf, u32 need_type_id,
2667 int btf_distill_func_proto(struct bpf_verifier_log *log,
2669 const struct btf_type *func_proto,
2670 const char *func_name,
2671 struct btf_func_model *m);
2673 struct bpf_reg_state;
2674 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog);
2675 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2676 struct btf *btf, const struct btf_type *t);
2677 const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
2678 int comp_idx, const char *tag_key);
2679 int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,
2680 int comp_idx, const char *tag_key, int last_id);
2682 struct bpf_prog *bpf_prog_by_id(u32 id);
2683 struct bpf_link *bpf_link_by_id(u32 id);
2685 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id,
2686 const struct bpf_prog *prog);
2687 void bpf_task_storage_free(struct task_struct *task);
2688 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2689 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2690 const struct btf_func_model *
2691 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2692 const struct bpf_insn *insn);
2693 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2694 u16 btf_fd_idx, u8 **func_addr);
2696 struct bpf_core_ctx {
2697 struct bpf_verifier_log *log;
2698 const struct btf *btf;
2701 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2702 const struct bpf_reg_state *reg,
2703 const char *field_name, u32 btf_id, const char *suffix);
2705 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2706 const struct btf *reg_btf, u32 reg_id,
2707 const struct btf *arg_btf, u32 arg_id);
2709 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2710 int relo_idx, void *insn);
2712 static inline bool unprivileged_ebpf_enabled(void)
2714 return !sysctl_unprivileged_bpf_disabled;
2717 /* Not all bpf prog type has the bpf_ctx.
2718 * For the bpf prog type that has initialized the bpf_ctx,
2719 * this function can be used to decide if a kernel function
2720 * is called by a bpf program.
2722 static inline bool has_current_bpf_ctx(void)
2724 return !!current->bpf_ctx;
2727 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2729 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2730 enum bpf_dynptr_type type, u32 offset, u32 size);
2731 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2732 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2734 #else /* !CONFIG_BPF_SYSCALL */
2735 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2737 return ERR_PTR(-EOPNOTSUPP);
2740 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2741 enum bpf_prog_type type,
2744 return ERR_PTR(-EOPNOTSUPP);
2747 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2751 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2755 static inline void bpf_prog_put(struct bpf_prog *prog)
2759 static inline void bpf_prog_inc(struct bpf_prog *prog)
2763 static inline struct bpf_prog *__must_check
2764 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2766 return ERR_PTR(-EOPNOTSUPP);
2769 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2770 const struct bpf_link_ops *ops,
2771 struct bpf_prog *prog)
2775 static inline void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
2776 const struct bpf_link_ops *ops, struct bpf_prog *prog,
2781 static inline int bpf_link_prime(struct bpf_link *link,
2782 struct bpf_link_primer *primer)
2787 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2792 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2796 static inline void bpf_link_inc(struct bpf_link *link)
2800 static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
2805 static inline void bpf_link_put(struct bpf_link *link)
2809 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2814 static inline bool bpf_token_capable(const struct bpf_token *token, int cap)
2816 return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));
2819 static inline void bpf_token_inc(struct bpf_token *token)
2823 static inline void bpf_token_put(struct bpf_token *token)
2827 static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd)
2829 return ERR_PTR(-EOPNOTSUPP);
2832 static inline void __dev_flush(struct list_head *flush_list)
2837 struct bpf_dtab_netdev;
2838 struct bpf_cpu_map_entry;
2841 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2842 struct net_device *dev_rx)
2848 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2849 struct net_device *dev_rx)
2855 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2856 struct bpf_map *map, bool exclude_ingress)
2863 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2864 struct sk_buff *skb,
2865 struct bpf_prog *xdp_prog)
2871 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2872 struct bpf_prog *xdp_prog, struct bpf_map *map,
2873 bool exclude_ingress)
2878 static inline void __cpu_map_flush(struct list_head *flush_list)
2882 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2883 struct xdp_frame *xdpf,
2884 struct net_device *dev_rx)
2889 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2890 struct sk_buff *skb)
2895 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2896 enum bpf_prog_type type)
2898 return ERR_PTR(-EOPNOTSUPP);
2901 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2902 const union bpf_attr *kattr,
2903 union bpf_attr __user *uattr)
2908 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2909 const union bpf_attr *kattr,
2910 union bpf_attr __user *uattr)
2915 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2916 const union bpf_attr *kattr,
2917 union bpf_attr __user *uattr)
2922 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2923 const union bpf_attr *kattr,
2924 union bpf_attr __user *uattr)
2929 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2930 const union bpf_attr *kattr,
2931 union bpf_attr __user *uattr)
2936 static inline void bpf_map_put(struct bpf_map *map)
2940 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2942 return ERR_PTR(-ENOTSUPP);
2945 static inline int btf_struct_access(struct bpf_verifier_log *log,
2946 const struct bpf_reg_state *reg,
2947 int off, int size, enum bpf_access_type atype,
2948 u32 *next_btf_id, enum bpf_type_flag *flag,
2949 const char **field_name)
2954 static inline const struct bpf_func_proto *
2955 bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
2960 static inline void bpf_task_storage_free(struct task_struct *task)
2964 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2969 static inline const struct btf_func_model *
2970 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2971 const struct bpf_insn *insn)
2977 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2978 u16 btf_fd_idx, u8 **func_addr)
2983 static inline bool unprivileged_ebpf_enabled(void)
2988 static inline bool has_current_bpf_ctx(void)
2993 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2997 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
3001 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
3002 enum bpf_dynptr_type type, u32 offset, u32 size)
3006 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
3010 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
3013 #endif /* CONFIG_BPF_SYSCALL */
3015 static __always_inline int
3016 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
3020 if (IS_ENABLED(CONFIG_BPF_EVENTS))
3021 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
3022 if (unlikely(ret < 0))
3023 memset(dst, 0, size);
3027 void __bpf_free_used_btfs(struct btf_mod_pair *used_btfs, u32 len);
3029 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
3030 enum bpf_prog_type type)
3032 return bpf_prog_get_type_dev(ufd, type, false);
3035 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
3036 struct bpf_map **used_maps, u32 len);
3038 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
3040 int bpf_prog_offload_compile(struct bpf_prog *prog);
3041 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
3042 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
3043 struct bpf_prog *prog);
3045 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
3047 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
3048 int bpf_map_offload_update_elem(struct bpf_map *map,
3049 void *key, void *value, u64 flags);
3050 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
3051 int bpf_map_offload_get_next_key(struct bpf_map *map,
3052 void *key, void *next_key);
3054 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
3056 struct bpf_offload_dev *
3057 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
3058 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
3059 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
3060 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
3061 struct net_device *netdev);
3062 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
3063 struct net_device *netdev);
3064 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
3066 void unpriv_ebpf_notify(int new_state);
3068 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
3069 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3070 struct bpf_prog_aux *prog_aux);
3071 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
3072 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
3073 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
3074 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
3076 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3078 return aux->dev_bound;
3081 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
3083 return aux->offload_requested;
3086 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
3088 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3090 return unlikely(map->ops == &bpf_map_offload_ops);
3093 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
3094 void bpf_map_offload_map_free(struct bpf_map *map);
3095 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
3096 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3097 const union bpf_attr *kattr,
3098 union bpf_attr __user *uattr);
3100 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
3101 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
3102 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
3103 int sock_map_bpf_prog_query(const union bpf_attr *attr,
3104 union bpf_attr __user *uattr);
3105 int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog);
3107 void sock_map_unhash(struct sock *sk);
3108 void sock_map_destroy(struct sock *sk);
3109 void sock_map_close(struct sock *sk, long timeout);
3111 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3112 struct bpf_prog_aux *prog_aux)
3117 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
3123 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
3124 union bpf_attr *attr)
3129 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
3130 struct bpf_prog *old_prog)
3135 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
3139 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3144 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
3149 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
3154 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3159 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
3161 return ERR_PTR(-EOPNOTSUPP);
3164 static inline void bpf_map_offload_map_free(struct bpf_map *map)
3168 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
3173 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3174 const union bpf_attr *kattr,
3175 union bpf_attr __user *uattr)
3180 #ifdef CONFIG_BPF_SYSCALL
3181 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
3182 struct bpf_prog *prog)
3187 static inline int sock_map_prog_detach(const union bpf_attr *attr,
3188 enum bpf_prog_type ptype)
3193 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
3199 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
3200 union bpf_attr __user *uattr)
3205 static inline int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
3209 #endif /* CONFIG_BPF_SYSCALL */
3210 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
3212 static __always_inline void
3213 bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
3215 const struct bpf_prog_array_item *item;
3216 struct bpf_prog *prog;
3218 if (unlikely(!array))
3221 item = &array->items[0];
3222 while ((prog = READ_ONCE(item->prog))) {
3223 bpf_prog_inc_misses_counter(prog);
3228 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
3229 void bpf_sk_reuseport_detach(struct sock *sk);
3230 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
3232 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
3233 void *value, u64 map_flags);
3235 static inline void bpf_sk_reuseport_detach(struct sock *sk)
3239 #ifdef CONFIG_BPF_SYSCALL
3240 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
3241 void *key, void *value)
3246 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
3247 void *key, void *value,
3252 #endif /* CONFIG_BPF_SYSCALL */
3253 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
3255 /* verifier prototypes for helper functions called from eBPF programs */
3256 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
3257 extern const struct bpf_func_proto bpf_map_update_elem_proto;
3258 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
3259 extern const struct bpf_func_proto bpf_map_push_elem_proto;
3260 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
3261 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
3262 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
3264 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
3265 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
3266 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
3267 extern const struct bpf_func_proto bpf_tail_call_proto;
3268 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
3269 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
3270 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
3271 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
3272 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
3273 extern const struct bpf_func_proto bpf_get_current_comm_proto;
3274 extern const struct bpf_func_proto bpf_get_stackid_proto;
3275 extern const struct bpf_func_proto bpf_get_stack_proto;
3276 extern const struct bpf_func_proto bpf_get_stack_sleepable_proto;
3277 extern const struct bpf_func_proto bpf_get_task_stack_proto;
3278 extern const struct bpf_func_proto bpf_get_task_stack_sleepable_proto;
3279 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
3280 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
3281 extern const struct bpf_func_proto bpf_sock_map_update_proto;
3282 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
3283 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
3284 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3285 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3286 extern const struct bpf_func_proto bpf_current_task_under_cgroup_proto;
3287 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3288 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3289 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3290 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3291 extern const struct bpf_func_proto bpf_spin_lock_proto;
3292 extern const struct bpf_func_proto bpf_spin_unlock_proto;
3293 extern const struct bpf_func_proto bpf_get_local_storage_proto;
3294 extern const struct bpf_func_proto bpf_strtol_proto;
3295 extern const struct bpf_func_proto bpf_strtoul_proto;
3296 extern const struct bpf_func_proto bpf_tcp_sock_proto;
3297 extern const struct bpf_func_proto bpf_jiffies64_proto;
3298 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3299 extern const struct bpf_func_proto bpf_event_output_data_proto;
3300 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3301 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3302 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3303 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3304 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3305 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3306 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3307 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3308 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3309 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3310 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3311 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3312 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3313 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3314 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3315 extern const struct bpf_func_proto bpf_copy_from_user_proto;
3316 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3317 extern const struct bpf_func_proto bpf_snprintf_proto;
3318 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3319 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3320 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3321 extern const struct bpf_func_proto bpf_sock_from_file_proto;
3322 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3323 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3324 extern const struct bpf_func_proto bpf_task_storage_get_proto;
3325 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3326 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3327 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3328 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3329 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3330 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3331 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3332 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3333 extern const struct bpf_func_proto bpf_find_vma_proto;
3334 extern const struct bpf_func_proto bpf_loop_proto;
3335 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3336 extern const struct bpf_func_proto bpf_set_retval_proto;
3337 extern const struct bpf_func_proto bpf_get_retval_proto;
3338 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3339 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3340 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3342 const struct bpf_func_proto *tracing_prog_func_proto(
3343 enum bpf_func_id func_id, const struct bpf_prog *prog);
3345 /* Shared helpers among cBPF and eBPF. */
3346 void bpf_user_rnd_init_once(void);
3347 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3348 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3350 #if defined(CONFIG_NET)
3351 bool bpf_sock_common_is_valid_access(int off, int size,
3352 enum bpf_access_type type,
3353 struct bpf_insn_access_aux *info);
3354 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3355 struct bpf_insn_access_aux *info);
3356 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3357 const struct bpf_insn *si,
3358 struct bpf_insn *insn_buf,
3359 struct bpf_prog *prog,
3361 int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3362 struct bpf_dynptr *ptr);
3364 static inline bool bpf_sock_common_is_valid_access(int off, int size,
3365 enum bpf_access_type type,
3366 struct bpf_insn_access_aux *info)
3370 static inline bool bpf_sock_is_valid_access(int off, int size,
3371 enum bpf_access_type type,
3372 struct bpf_insn_access_aux *info)
3376 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3377 const struct bpf_insn *si,
3378 struct bpf_insn *insn_buf,
3379 struct bpf_prog *prog,
3384 static inline int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3385 struct bpf_dynptr *ptr)
3392 struct sk_reuseport_kern {
3393 struct sk_buff *skb;
3395 struct sock *selected_sk;
3396 struct sock *migrating_sk;
3402 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3403 struct bpf_insn_access_aux *info);
3405 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3406 const struct bpf_insn *si,
3407 struct bpf_insn *insn_buf,
3408 struct bpf_prog *prog,
3411 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3412 struct bpf_insn_access_aux *info);
3414 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3415 const struct bpf_insn *si,
3416 struct bpf_insn *insn_buf,
3417 struct bpf_prog *prog,
3420 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3421 enum bpf_access_type type,
3422 struct bpf_insn_access_aux *info)
3427 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3428 const struct bpf_insn *si,
3429 struct bpf_insn *insn_buf,
3430 struct bpf_prog *prog,
3435 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3436 enum bpf_access_type type,
3437 struct bpf_insn_access_aux *info)
3442 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3443 const struct bpf_insn *si,
3444 struct bpf_insn *insn_buf,
3445 struct bpf_prog *prog,
3450 #endif /* CONFIG_INET */
3452 enum bpf_text_poke_type {
3457 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3458 void *addr1, void *addr2);
3460 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3461 struct bpf_prog *new, struct bpf_prog *old);
3463 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3464 int bpf_arch_text_invalidate(void *dst, size_t len);
3467 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3469 #define MAX_BPRINTF_VARARGS 12
3470 #define MAX_BPRINTF_BUF 1024
3472 struct bpf_bprintf_data {
3479 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3480 u32 num_args, struct bpf_bprintf_data *data);
3481 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3483 #ifdef CONFIG_BPF_LSM
3484 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3485 void bpf_cgroup_atype_put(int cgroup_atype);
3487 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
3488 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3489 #endif /* CONFIG_BPF_LSM */
3498 #endif /* CONFIG_KEYS */
3500 static inline bool type_is_alloc(u32 type)
3502 return type & MEM_ALLOC;
3505 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3507 if (memcg_bpf_enabled())
3508 return flags | __GFP_ACCOUNT;
3512 static inline bool bpf_is_subprog(const struct bpf_prog *prog)
3514 return prog->aux->func_idx != 0;
3517 #endif /* _LINUX_BPF_H */