1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
7 #include <uapi/linux/bpf.h>
8 #include <uapi/linux/filter.h>
10 #include <linux/workqueue.h>
11 #include <linux/file.h>
12 #include <linux/percpu.h>
13 #include <linux/err.h>
14 #include <linux/rbtree_latch.h>
15 #include <linux/numa.h>
16 #include <linux/mm_types.h>
17 #include <linux/wait.h>
18 #include <linux/refcount.h>
19 #include <linux/mutex.h>
20 #include <linux/module.h>
21 #include <linux/kallsyms.h>
22 #include <linux/capability.h>
23 #include <linux/sched/mm.h>
24 #include <linux/slab.h>
25 #include <linux/percpu-refcount.h>
26 #include <linux/stddef.h>
27 #include <linux/bpfptr.h>
28 #include <linux/btf.h>
29 #include <linux/rcupdate_trace.h>
30 #include <linux/static_call.h>
31 #include <linux/memcontrol.h>
33 struct bpf_verifier_env;
34 struct bpf_verifier_log;
43 struct exception_table_entry;
44 struct seq_operations;
45 struct bpf_iter_aux_info;
46 struct bpf_local_storage;
47 struct bpf_local_storage_map;
51 struct bpf_func_state;
55 extern struct idr btf_idr;
56 extern spinlock_t btf_idr_lock;
57 extern struct kobject *btf_kobj;
58 extern struct bpf_mem_alloc bpf_global_ma;
59 extern bool bpf_global_ma_set;
61 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
62 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
63 struct bpf_iter_aux_info *aux);
64 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
65 typedef unsigned int (*bpf_func_t)(const void *,
66 const struct bpf_insn *);
67 struct bpf_iter_seq_info {
68 const struct seq_operations *seq_ops;
69 bpf_iter_init_seq_priv_t init_seq_private;
70 bpf_iter_fini_seq_priv_t fini_seq_private;
74 /* map is generic key/value storage optionally accessible by eBPF programs */
76 /* funcs callable from userspace (via syscall) */
77 int (*map_alloc_check)(union bpf_attr *attr);
78 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
79 void (*map_release)(struct bpf_map *map, struct file *map_file);
80 void (*map_free)(struct bpf_map *map);
81 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
82 void (*map_release_uref)(struct bpf_map *map);
83 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
84 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
85 union bpf_attr __user *uattr);
86 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
87 void *value, u64 flags);
88 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
89 const union bpf_attr *attr,
90 union bpf_attr __user *uattr);
91 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
92 const union bpf_attr *attr,
93 union bpf_attr __user *uattr);
94 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
95 union bpf_attr __user *uattr);
97 /* funcs callable from userspace and from eBPF programs */
98 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
99 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
100 long (*map_delete_elem)(struct bpf_map *map, void *key);
101 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
102 long (*map_pop_elem)(struct bpf_map *map, void *value);
103 long (*map_peek_elem)(struct bpf_map *map, void *value);
104 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
106 /* funcs called by prog_array and perf_event_array map */
107 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
109 void (*map_fd_put_ptr)(void *ptr);
110 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
111 u32 (*map_fd_sys_lookup_elem)(void *ptr);
112 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
114 int (*map_check_btf)(const struct bpf_map *map,
115 const struct btf *btf,
116 const struct btf_type *key_type,
117 const struct btf_type *value_type);
119 /* Prog poke tracking helpers. */
120 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
121 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
122 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
123 struct bpf_prog *new);
125 /* Direct value access helpers. */
126 int (*map_direct_value_addr)(const struct bpf_map *map,
128 int (*map_direct_value_meta)(const struct bpf_map *map,
130 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
131 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
132 struct poll_table_struct *pts);
134 /* Functions called by bpf_local_storage maps */
135 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
136 void *owner, u32 size);
137 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
138 void *owner, u32 size);
139 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
142 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
144 /* map_meta_equal must be implemented for maps that can be
145 * used as an inner map. It is a runtime check to ensure
146 * an inner map can be inserted to an outer map.
148 * Some properties of the inner map has been used during the
149 * verification time. When inserting an inner map at the runtime,
150 * map_meta_equal has to ensure the inserting map has the same
151 * properties that the verifier has used earlier.
153 bool (*map_meta_equal)(const struct bpf_map *meta0,
154 const struct bpf_map *meta1);
157 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
158 struct bpf_func_state *caller,
159 struct bpf_func_state *callee);
160 long (*map_for_each_callback)(struct bpf_map *map,
161 bpf_callback_t callback_fn,
162 void *callback_ctx, u64 flags);
164 u64 (*map_mem_usage)(const struct bpf_map *map);
166 /* BTF id of struct allocated by map_alloc */
169 /* bpf_iter info used to open a seq_file */
170 const struct bpf_iter_seq_info *iter_seq_info;
174 /* Support at most 10 fields in a BTF type */
178 enum btf_field_type {
179 BPF_SPIN_LOCK = (1 << 0),
180 BPF_TIMER = (1 << 1),
181 BPF_KPTR_UNREF = (1 << 2),
182 BPF_KPTR_REF = (1 << 3),
183 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF,
184 BPF_LIST_HEAD = (1 << 4),
185 BPF_LIST_NODE = (1 << 5),
186 BPF_RB_ROOT = (1 << 6),
187 BPF_RB_NODE = (1 << 7),
188 BPF_GRAPH_NODE_OR_ROOT = BPF_LIST_NODE | BPF_LIST_HEAD |
189 BPF_RB_NODE | BPF_RB_ROOT,
190 BPF_REFCOUNT = (1 << 8),
193 typedef void (*btf_dtor_kfunc_t)(void *);
195 struct btf_field_kptr {
197 struct module *module;
198 /* dtor used if btf_is_kernel(btf), otherwise the type is
199 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
201 btf_dtor_kfunc_t dtor;
205 struct btf_field_graph_root {
209 struct btf_record *value_rec;
215 enum btf_field_type type;
217 struct btf_field_kptr kptr;
218 struct btf_field_graph_root graph_root;
228 struct btf_field fields[];
232 /* The first two cachelines with read-mostly members of which some
233 * are also accessed in fast-path (e.g. ops, max_entries).
235 const struct bpf_map_ops *ops ____cacheline_aligned;
236 struct bpf_map *inner_map_meta;
237 #ifdef CONFIG_SECURITY
240 enum bpf_map_type map_type;
244 u64 map_extra; /* any per-map-type extra fields */
247 struct btf_record *record;
250 u32 btf_value_type_id;
251 u32 btf_vmlinux_value_type_id;
253 #ifdef CONFIG_MEMCG_KMEM
254 struct obj_cgroup *objcg;
256 char name[BPF_OBJ_NAME_LEN];
257 /* The 3rd and 4th cacheline with misc members to avoid false sharing
258 * particularly with refcounting.
260 atomic64_t refcnt ____cacheline_aligned;
262 struct work_struct work;
263 struct mutex freeze_mutex;
265 /* 'Ownership' of program-containing map is claimed by the first program
266 * that is going to use this map or by the first program which FD is
267 * stored in the map to make sure that all callers and callees have the
268 * same prog type, JITed flag and xdp_has_frags flag.
272 enum bpf_prog_type type;
277 bool frozen; /* write-once; write-protected by freeze_mutex */
280 static inline const char *btf_field_type_name(enum btf_field_type type)
284 return "bpf_spin_lock";
291 return "bpf_list_head";
293 return "bpf_list_node";
295 return "bpf_rb_root";
297 return "bpf_rb_node";
299 return "bpf_refcount";
306 static inline u32 btf_field_type_size(enum btf_field_type type)
310 return sizeof(struct bpf_spin_lock);
312 return sizeof(struct bpf_timer);
317 return sizeof(struct bpf_list_head);
319 return sizeof(struct bpf_list_node);
321 return sizeof(struct bpf_rb_root);
323 return sizeof(struct bpf_rb_node);
325 return sizeof(struct bpf_refcount);
332 static inline u32 btf_field_type_align(enum btf_field_type type)
336 return __alignof__(struct bpf_spin_lock);
338 return __alignof__(struct bpf_timer);
341 return __alignof__(u64);
343 return __alignof__(struct bpf_list_head);
345 return __alignof__(struct bpf_list_node);
347 return __alignof__(struct bpf_rb_root);
349 return __alignof__(struct bpf_rb_node);
351 return __alignof__(struct bpf_refcount);
358 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
360 memset(addr, 0, field->size);
362 switch (field->type) {
364 refcount_set((refcount_t *)addr, 1);
367 RB_CLEAR_NODE((struct rb_node *)addr);
371 INIT_LIST_HEAD((struct list_head *)addr);
374 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
386 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
388 if (IS_ERR_OR_NULL(rec))
390 return rec->field_mask & type;
393 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
397 if (IS_ERR_OR_NULL(rec))
399 for (i = 0; i < rec->cnt; i++)
400 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
403 /* 'dst' must be a temporary buffer and should not point to memory that is being
404 * used in parallel by a bpf program or bpf syscall, otherwise the access from
405 * the bpf program or bpf syscall may be corrupted by the reinitialization,
406 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
407 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
408 * program or bpf syscall.
410 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
412 bpf_obj_init(map->record, dst);
415 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
416 * forced to use 'long' read/writes to try to atomically copy long counters.
417 * Best-effort only. No barriers here, since it _will_ race with concurrent
418 * updates from BPF programs. Called from bpf syscall and mostly used with
419 * size 8 or 16 bytes, so ask compiler to inline it.
421 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
423 const long *lsrc = src;
426 size /= sizeof(long);
431 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
432 static inline void bpf_obj_memcpy(struct btf_record *rec,
433 void *dst, void *src, u32 size,
439 if (IS_ERR_OR_NULL(rec)) {
441 bpf_long_memcpy(dst, src, round_up(size, 8));
443 memcpy(dst, src, size);
447 for (i = 0; i < rec->cnt; i++) {
448 u32 next_off = rec->fields[i].offset;
449 u32 sz = next_off - curr_off;
451 memcpy(dst + curr_off, src + curr_off, sz);
452 curr_off += rec->fields[i].size + sz;
454 memcpy(dst + curr_off, src + curr_off, size - curr_off);
457 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
459 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
462 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
464 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
467 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
472 if (IS_ERR_OR_NULL(rec)) {
473 memset(dst, 0, size);
477 for (i = 0; i < rec->cnt; i++) {
478 u32 next_off = rec->fields[i].offset;
479 u32 sz = next_off - curr_off;
481 memset(dst + curr_off, 0, sz);
482 curr_off += rec->fields[i].size + sz;
484 memset(dst + curr_off, 0, size - curr_off);
487 static inline void zero_map_value(struct bpf_map *map, void *dst)
489 bpf_obj_memzero(map->record, dst, map->value_size);
492 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
494 void bpf_timer_cancel_and_free(void *timer);
495 void bpf_list_head_free(const struct btf_field *field, void *list_head,
496 struct bpf_spin_lock *spin_lock);
497 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
498 struct bpf_spin_lock *spin_lock);
501 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
503 struct bpf_offload_dev;
504 struct bpf_offloaded_map;
506 struct bpf_map_dev_ops {
507 int (*map_get_next_key)(struct bpf_offloaded_map *map,
508 void *key, void *next_key);
509 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
510 void *key, void *value);
511 int (*map_update_elem)(struct bpf_offloaded_map *map,
512 void *key, void *value, u64 flags);
513 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
516 struct bpf_offloaded_map {
518 struct net_device *netdev;
519 const struct bpf_map_dev_ops *dev_ops;
521 struct list_head offloads;
524 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
526 return container_of(map, struct bpf_offloaded_map, map);
529 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
531 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
534 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
536 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
537 map->ops->map_seq_show_elem;
540 int map_check_no_btf(const struct bpf_map *map,
541 const struct btf *btf,
542 const struct btf_type *key_type,
543 const struct btf_type *value_type);
545 bool bpf_map_meta_equal(const struct bpf_map *meta0,
546 const struct bpf_map *meta1);
548 extern const struct bpf_map_ops bpf_map_offload_ops;
550 /* bpf_type_flag contains a set of flags that are applicable to the values of
551 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
552 * or a memory is read-only. We classify types into two categories: base types
553 * and extended types. Extended types are base types combined with a type flag.
555 * Currently there are no more than 32 base types in arg_type, ret_type and
558 #define BPF_BASE_TYPE_BITS 8
561 /* PTR may be NULL. */
562 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
564 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
565 * compatible with both mutable and immutable memory.
567 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
569 /* MEM points to BPF ring buffer reservation. */
570 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
572 /* MEM is in user address space. */
573 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
575 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
576 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
577 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
578 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
579 * to the specified cpu.
581 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
583 /* Indicates that the argument will be released. */
584 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
586 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
587 * unreferenced and referenced kptr loaded from map value using a load
588 * instruction, so that they can only be dereferenced but not escape the
589 * BPF program into the kernel (i.e. cannot be passed as arguments to
590 * kfunc or bpf helpers).
592 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
594 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
596 /* DYNPTR points to memory local to the bpf program. */
597 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
599 /* DYNPTR points to a kernel-produced ringbuf record. */
600 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
602 /* Size is known at compile time. */
603 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
605 /* MEM is of an allocated object of type in program BTF. This is used to
606 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
608 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
610 /* PTR was passed from the kernel in a trusted context, and may be
611 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
612 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
613 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
614 * without invoking bpf_kptr_xchg(). What we really need to know is
615 * whether a pointer is safe to pass to a kfunc or BPF helper function.
616 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
617 * helpers, they do not cover all possible instances of unsafe
618 * pointers. For example, a pointer that was obtained from walking a
619 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
620 * fact that it may be NULL, invalid, etc. This is due to backwards
621 * compatibility requirements, as this was the behavior that was first
622 * introduced when kptrs were added. The behavior is now considered
623 * deprecated, and PTR_UNTRUSTED will eventually be removed.
625 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
626 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
627 * For example, pointers passed to tracepoint arguments are considered
628 * PTR_TRUSTED, as are pointers that are passed to struct_ops
629 * callbacks. As alluded to above, pointers that are obtained from
630 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
631 * struct task_struct *task is PTR_TRUSTED, then accessing
632 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
633 * in a BPF register. Similarly, pointers passed to certain programs
634 * types such as kretprobes are not guaranteed to be valid, as they may
635 * for example contain an object that was recently freed.
637 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
639 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
640 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
642 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
643 * Currently only valid for linked-list and rbtree nodes.
645 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
647 /* DYNPTR points to sk_buff */
648 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
650 /* DYNPTR points to xdp_buff */
651 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
654 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
657 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
660 /* Max number of base types. */
661 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
663 /* Max number of all types. */
664 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
666 /* function argument constraints */
668 ARG_DONTCARE = 0, /* unused argument in helper function */
670 /* the following constraints used to prototype
671 * bpf_map_lookup/update/delete_elem() functions
673 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
674 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
675 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
677 /* Used to prototype bpf_memcmp() and other functions that access data
678 * on eBPF program stack
680 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
682 ARG_CONST_SIZE, /* number of bytes accessed from memory */
683 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
685 ARG_PTR_TO_CTX, /* pointer to context */
686 ARG_ANYTHING, /* any (initialized) argument is ok */
687 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
688 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
689 ARG_PTR_TO_INT, /* pointer to int */
690 ARG_PTR_TO_LONG, /* pointer to long */
691 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
692 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
693 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
694 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
695 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
696 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
697 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
698 ARG_PTR_TO_STACK, /* pointer to stack */
699 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
700 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
701 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */
702 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
705 /* Extended arg_types. */
706 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
707 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
708 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
709 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
710 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
711 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
712 /* pointer to memory does not need to be initialized, helper function must fill
713 * all bytes or clear them in error case.
715 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM,
716 /* Pointer to valid memory of size known at compile time. */
717 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
719 /* This must be the last entry. Its purpose is to ensure the enum is
720 * wide enough to hold the higher bits reserved for bpf_type_flag.
722 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
724 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
726 /* type of values returned from helper functions */
727 enum bpf_return_type {
728 RET_INTEGER, /* function returns integer */
729 RET_VOID, /* function doesn't return anything */
730 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
731 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
732 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
733 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
734 RET_PTR_TO_MEM, /* returns a pointer to memory */
735 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
736 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
739 /* Extended ret_types. */
740 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
741 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
742 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
743 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
744 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
745 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
746 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
747 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
749 /* This must be the last entry. Its purpose is to ensure the enum is
750 * wide enough to hold the higher bits reserved for bpf_type_flag.
752 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
754 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
756 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
757 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
758 * instructions after verifying
760 struct bpf_func_proto {
761 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
765 enum bpf_return_type ret_type;
768 enum bpf_arg_type arg1_type;
769 enum bpf_arg_type arg2_type;
770 enum bpf_arg_type arg3_type;
771 enum bpf_arg_type arg4_type;
772 enum bpf_arg_type arg5_type;
774 enum bpf_arg_type arg_type[5];
794 int *ret_btf_id; /* return value btf_id */
795 bool (*allowed)(const struct bpf_prog *prog);
798 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
799 * the first argument to eBPF programs.
800 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
804 enum bpf_access_type {
809 /* types of values stored in eBPF registers */
810 /* Pointer types represent:
813 * pointer + (u16) var
814 * pointer + (u16) var + imm
815 * if (range > 0) then [ptr, ptr + range - off) is safe to access
816 * if (id > 0) means that some 'var' was added
817 * if (off > 0) means that 'imm' was added
820 NOT_INIT = 0, /* nothing was written into register */
821 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
822 PTR_TO_CTX, /* reg points to bpf_context */
823 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
824 PTR_TO_MAP_VALUE, /* reg points to map element value */
825 PTR_TO_MAP_KEY, /* reg points to a map element key */
826 PTR_TO_STACK, /* reg == frame_pointer + offset */
827 PTR_TO_PACKET_META, /* skb->data - meta_len */
828 PTR_TO_PACKET, /* reg points to skb->data */
829 PTR_TO_PACKET_END, /* skb->data + headlen */
830 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
831 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
832 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
833 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
834 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
835 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
836 /* PTR_TO_BTF_ID points to a kernel struct that does not need
837 * to be null checked by the BPF program. This does not imply the
838 * pointer is _not_ null and in practice this can easily be a null
839 * pointer when reading pointer chains. The assumption is program
840 * context will handle null pointer dereference typically via fault
841 * handling. The verifier must keep this in mind and can make no
842 * assumptions about null or non-null when doing branch analysis.
843 * Further, when passed into helpers the helpers can not, without
844 * additional context, assume the value is non-null.
847 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
848 * been checked for null. Used primarily to inform the verifier
849 * an explicit null check is required for this struct.
851 PTR_TO_MEM, /* reg points to valid memory region */
852 PTR_TO_BUF, /* reg points to a read/write buffer */
853 PTR_TO_FUNC, /* reg points to a bpf program function */
854 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
857 /* Extended reg_types. */
858 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
859 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
860 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
861 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
862 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
864 /* This must be the last entry. Its purpose is to ensure the enum is
865 * wide enough to hold the higher bits reserved for bpf_type_flag.
867 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
869 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
871 /* The information passed from prog-specific *_is_valid_access
872 * back to the verifier.
874 struct bpf_insn_access_aux {
875 enum bpf_reg_type reg_type;
883 struct bpf_verifier_log *log; /* for verbose logs */
887 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
889 aux->ctx_field_size = size;
892 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
894 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
895 insn->src_reg == BPF_PSEUDO_FUNC;
898 struct bpf_prog_ops {
899 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
900 union bpf_attr __user *uattr);
903 struct bpf_reg_state;
904 struct bpf_verifier_ops {
905 /* return eBPF function prototype for verification */
906 const struct bpf_func_proto *
907 (*get_func_proto)(enum bpf_func_id func_id,
908 const struct bpf_prog *prog);
910 /* return true if 'size' wide access at offset 'off' within bpf_context
911 * with 'type' (read or write) is allowed
913 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
914 const struct bpf_prog *prog,
915 struct bpf_insn_access_aux *info);
916 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
917 const struct bpf_prog *prog);
918 int (*gen_ld_abs)(const struct bpf_insn *orig,
919 struct bpf_insn *insn_buf);
920 u32 (*convert_ctx_access)(enum bpf_access_type type,
921 const struct bpf_insn *src,
922 struct bpf_insn *dst,
923 struct bpf_prog *prog, u32 *target_size);
924 int (*btf_struct_access)(struct bpf_verifier_log *log,
925 const struct bpf_reg_state *reg,
929 struct bpf_prog_offload_ops {
930 /* verifier basic callbacks */
931 int (*insn_hook)(struct bpf_verifier_env *env,
932 int insn_idx, int prev_insn_idx);
933 int (*finalize)(struct bpf_verifier_env *env);
934 /* verifier optimization callbacks (called after .finalize) */
935 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
936 struct bpf_insn *insn);
937 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
938 /* program management callbacks */
939 int (*prepare)(struct bpf_prog *prog);
940 int (*translate)(struct bpf_prog *prog);
941 void (*destroy)(struct bpf_prog *prog);
944 struct bpf_prog_offload {
945 struct bpf_prog *prog;
946 struct net_device *netdev;
947 struct bpf_offload_dev *offdev;
949 struct list_head offloads;
956 enum bpf_cgroup_storage_type {
957 BPF_CGROUP_STORAGE_SHARED,
958 BPF_CGROUP_STORAGE_PERCPU,
959 __BPF_CGROUP_STORAGE_MAX
962 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
964 /* The longest tracepoint has 12 args.
965 * See include/trace/bpf_probe.h
967 #define MAX_BPF_FUNC_ARGS 12
969 /* The maximum number of arguments passed through registers
970 * a single function may have.
972 #define MAX_BPF_FUNC_REG_ARGS 5
974 /* The argument is a structure. */
975 #define BTF_FMODEL_STRUCT_ARG BIT(0)
977 /* The argument is signed. */
978 #define BTF_FMODEL_SIGNED_ARG BIT(1)
980 struct btf_func_model {
984 u8 arg_size[MAX_BPF_FUNC_ARGS];
985 u8 arg_flags[MAX_BPF_FUNC_ARGS];
988 /* Restore arguments before returning from trampoline to let original function
989 * continue executing. This flag is used for fentry progs when there are no
992 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
993 /* Call original function after fentry progs, but before fexit progs.
994 * Makes sense for fentry/fexit, normal calls and indirect calls.
996 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
997 /* Skip current frame and return to parent. Makes sense for fentry/fexit
998 * programs only. Should not be used with normal calls and indirect calls.
1000 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1001 /* Store IP address of the caller on the trampoline stack,
1002 * so it's available for trampoline's programs.
1004 #define BPF_TRAMP_F_IP_ARG BIT(3)
1005 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1006 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1008 /* Get original function from stack instead of from provided direct address.
1009 * Makes sense for trampolines with fexit or fmod_ret programs.
1011 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
1013 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1014 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1016 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1018 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1022 #if defined(__s390x__)
1023 BPF_MAX_TRAMP_LINKS = 27,
1025 BPF_MAX_TRAMP_LINKS = 38,
1029 struct bpf_tramp_links {
1030 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1034 struct bpf_tramp_run_ctx;
1036 /* Different use cases for BPF trampoline:
1037 * 1. replace nop at the function entry (kprobe equivalent)
1038 * flags = BPF_TRAMP_F_RESTORE_REGS
1039 * fentry = a set of programs to run before returning from trampoline
1041 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1042 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1043 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1044 * fentry = a set of program to run before calling original function
1045 * fexit = a set of program to run after original function
1047 * 3. replace direct call instruction anywhere in the function body
1048 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1050 * fentry = a set of programs to run before returning from trampoline
1051 * With flags = BPF_TRAMP_F_CALL_ORIG
1052 * orig_call = original callback addr or direct function addr
1053 * fentry = a set of program to run before calling original function
1054 * fexit = a set of program to run after original function
1056 struct bpf_tramp_image;
1057 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
1058 const struct btf_func_model *m, u32 flags,
1059 struct bpf_tramp_links *tlinks,
1061 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1062 struct bpf_tramp_run_ctx *run_ctx);
1063 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1064 struct bpf_tramp_run_ctx *run_ctx);
1065 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1066 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1067 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1068 struct bpf_tramp_run_ctx *run_ctx);
1069 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1070 struct bpf_tramp_run_ctx *run_ctx);
1071 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1072 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1075 unsigned long start;
1077 char name[KSYM_NAME_LEN];
1078 struct list_head lnode;
1079 struct latch_tree_node tnode;
1083 enum bpf_tramp_prog_type {
1086 BPF_TRAMP_MODIFY_RETURN,
1088 BPF_TRAMP_REPLACE, /* more than MAX */
1091 struct bpf_tramp_image {
1093 struct bpf_ksym ksym;
1094 struct percpu_ref pcref;
1095 void *ip_after_call;
1098 struct rcu_head rcu;
1099 struct work_struct work;
1103 struct bpf_trampoline {
1104 /* hlist for trampoline_table */
1105 struct hlist_node hlist;
1106 struct ftrace_ops *fops;
1107 /* serializes access to fields of this trampoline */
1113 struct btf_func_model model;
1115 bool ftrace_managed;
1117 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1118 * program by replacing one of its functions. func.addr is the address
1119 * of the function it replaced.
1121 struct bpf_prog *extension_prog;
1122 /* list of BPF programs using this trampoline */
1123 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1124 /* Number of attached programs. A counter per kind. */
1125 int progs_cnt[BPF_TRAMP_MAX];
1126 /* Executable image of trampoline */
1127 struct bpf_tramp_image *cur_image;
1132 struct bpf_attach_target_info {
1133 struct btf_func_model fmodel;
1135 struct module *tgt_mod;
1136 const char *tgt_name;
1137 const struct btf_type *tgt_type;
1140 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1142 struct bpf_dispatcher_prog {
1143 struct bpf_prog *prog;
1147 struct bpf_dispatcher {
1148 /* dispatcher mutex */
1151 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1156 struct bpf_ksym ksym;
1157 #ifdef CONFIG_HAVE_STATIC_CALL
1158 struct static_call_key *sc_key;
1163 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
1165 const struct bpf_insn *insnsi,
1166 bpf_func_t bpf_func)
1168 return bpf_func(ctx, insnsi);
1171 /* the implementation of the opaque uapi struct bpf_dynptr */
1172 struct bpf_dynptr_kern {
1174 /* Size represents the number of usable bytes of dynptr data.
1175 * If for example the offset is at 4 for a local dynptr whose data is
1176 * of type u64, the number of usable bytes is 4.
1178 * The upper 8 bits are reserved. It is as follows:
1179 * Bits 0 - 23 = size
1180 * Bits 24 - 30 = dynptr type
1181 * Bit 31 = whether dynptr is read-only
1187 enum bpf_dynptr_type {
1188 BPF_DYNPTR_TYPE_INVALID,
1189 /* Points to memory that is local to the bpf program */
1190 BPF_DYNPTR_TYPE_LOCAL,
1191 /* Underlying data is a ringbuf record */
1192 BPF_DYNPTR_TYPE_RINGBUF,
1193 /* Underlying data is a sk_buff */
1194 BPF_DYNPTR_TYPE_SKB,
1195 /* Underlying data is a xdp_buff */
1196 BPF_DYNPTR_TYPE_XDP,
1199 int bpf_dynptr_check_size(u32 size);
1200 u32 bpf_dynptr_get_size(const struct bpf_dynptr_kern *ptr);
1202 #ifdef CONFIG_BPF_JIT
1203 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1204 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1205 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1206 struct bpf_attach_target_info *tgt_info);
1207 void bpf_trampoline_put(struct bpf_trampoline *tr);
1208 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1211 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1212 * indirection with a direct call to the bpf program. If the architecture does
1213 * not have STATIC_CALL, avoid a double-indirection.
1215 #ifdef CONFIG_HAVE_STATIC_CALL
1217 #define __BPF_DISPATCHER_SC_INIT(_name) \
1218 .sc_key = &STATIC_CALL_KEY(_name), \
1219 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1221 #define __BPF_DISPATCHER_SC(name) \
1222 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1224 #define __BPF_DISPATCHER_CALL(name) \
1225 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1227 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1228 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1231 #define __BPF_DISPATCHER_SC_INIT(name)
1232 #define __BPF_DISPATCHER_SC(name)
1233 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1234 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1237 #define BPF_DISPATCHER_INIT(_name) { \
1238 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1239 .func = &_name##_func, \
1246 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1248 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1251 #define DEFINE_BPF_DISPATCHER(name) \
1252 __BPF_DISPATCHER_SC(name); \
1253 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
1255 const struct bpf_insn *insnsi, \
1256 bpf_func_t bpf_func) \
1258 return __BPF_DISPATCHER_CALL(name); \
1260 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1261 struct bpf_dispatcher bpf_dispatcher_##name = \
1262 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1264 #define DECLARE_BPF_DISPATCHER(name) \
1265 unsigned int bpf_dispatcher_##name##_func( \
1267 const struct bpf_insn *insnsi, \
1268 bpf_func_t bpf_func); \
1269 extern struct bpf_dispatcher bpf_dispatcher_##name;
1271 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1272 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1273 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1274 struct bpf_prog *to);
1275 /* Called only from JIT-enabled code, so there's no need for stubs. */
1276 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
1277 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1278 void bpf_ksym_add(struct bpf_ksym *ksym);
1279 void bpf_ksym_del(struct bpf_ksym *ksym);
1280 int bpf_jit_charge_modmem(u32 size);
1281 void bpf_jit_uncharge_modmem(u32 size);
1282 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1284 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1285 struct bpf_trampoline *tr)
1289 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1290 struct bpf_trampoline *tr)
1294 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1295 struct bpf_attach_target_info *tgt_info)
1297 return ERR_PTR(-EOPNOTSUPP);
1299 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1300 #define DEFINE_BPF_DISPATCHER(name)
1301 #define DECLARE_BPF_DISPATCHER(name)
1302 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1303 #define BPF_DISPATCHER_PTR(name) NULL
1304 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1305 struct bpf_prog *from,
1306 struct bpf_prog *to) {}
1307 static inline bool is_bpf_image_address(unsigned long address)
1311 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1317 struct bpf_func_info_aux {
1322 enum bpf_jit_poke_reason {
1323 BPF_POKE_REASON_TAIL_CALL,
1326 /* Descriptor of pokes pointing /into/ the JITed image. */
1327 struct bpf_jit_poke_descriptor {
1328 void *tailcall_target;
1329 void *tailcall_bypass;
1334 struct bpf_map *map;
1338 bool tailcall_target_stable;
1344 /* reg_type info for ctx arguments */
1345 struct bpf_ctx_arg_aux {
1347 enum bpf_reg_type reg_type;
1351 struct btf_mod_pair {
1353 struct module *module;
1356 struct bpf_kfunc_desc_tab;
1358 struct bpf_prog_aux {
1367 u32 func_cnt; /* used by non-func prog as the number of func progs */
1368 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1369 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1370 u32 ctx_arg_info_size;
1371 u32 max_rdonly_access;
1372 u32 max_rdwr_access;
1373 struct btf *attach_btf;
1374 const struct bpf_ctx_arg_aux *ctx_arg_info;
1375 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1376 struct bpf_prog *dst_prog;
1377 struct bpf_trampoline *dst_trampoline;
1378 enum bpf_prog_type saved_dst_prog_type;
1379 enum bpf_attach_type saved_dst_attach_type;
1380 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1381 bool dev_bound; /* Program is bound to the netdev. */
1382 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1383 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1384 bool func_proto_unreliable;
1386 bool tail_call_reachable;
1388 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1389 const struct btf_type *attach_func_proto;
1390 /* function name for valid attach_btf_id */
1391 const char *attach_func_name;
1392 struct bpf_prog **func;
1393 void *jit_data; /* JIT specific data. arch dependent */
1394 struct bpf_jit_poke_descriptor *poke_tab;
1395 struct bpf_kfunc_desc_tab *kfunc_tab;
1396 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1398 struct bpf_ksym ksym;
1399 const struct bpf_prog_ops *ops;
1400 struct bpf_map **used_maps;
1401 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1402 struct btf_mod_pair *used_btfs;
1403 struct bpf_prog *prog;
1404 struct user_struct *user;
1405 u64 load_time; /* ns since boottime */
1407 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1408 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1409 char name[BPF_OBJ_NAME_LEN];
1410 #ifdef CONFIG_SECURITY
1413 struct bpf_prog_offload *offload;
1415 struct bpf_func_info *func_info;
1416 struct bpf_func_info_aux *func_info_aux;
1417 /* bpf_line_info loaded from userspace. linfo->insn_off
1418 * has the xlated insn offset.
1419 * Both the main and sub prog share the same linfo.
1420 * The subprog can access its first linfo by
1421 * using the linfo_idx.
1423 struct bpf_line_info *linfo;
1424 /* jited_linfo is the jited addr of the linfo. It has a
1425 * one to one mapping to linfo:
1426 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1427 * Both the main and sub prog share the same jited_linfo.
1428 * The subprog can access its first jited_linfo by
1429 * using the linfo_idx.
1434 /* subprog can use linfo_idx to access its first linfo and
1436 * main prog always has linfo_idx == 0
1441 struct exception_table_entry *extable;
1443 struct work_struct work;
1444 struct rcu_head rcu;
1449 u16 pages; /* Number of allocated pages */
1450 u16 jited:1, /* Is our filter JIT'ed? */
1451 jit_requested:1,/* archs need to JIT the prog */
1452 gpl_compatible:1, /* Is filter GPL compatible? */
1453 cb_access:1, /* Is control block accessed? */
1454 dst_needed:1, /* Do we need dst entry? */
1455 blinding_requested:1, /* needs constant blinding */
1456 blinded:1, /* Was blinded */
1457 is_func:1, /* program is a bpf function */
1458 kprobe_override:1, /* Do we override a kprobe? */
1459 has_callchain_buf:1, /* callchain buffer allocated? */
1460 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1461 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1462 call_get_func_ip:1, /* Do we call get_func_ip() */
1463 tstamp_type_access:1; /* Accessed __sk_buff->tstamp_type */
1464 enum bpf_prog_type type; /* Type of BPF program */
1465 enum bpf_attach_type expected_attach_type; /* For some prog types */
1466 u32 len; /* Number of filter blocks */
1467 u32 jited_len; /* Size of jited insns in bytes */
1468 u8 tag[BPF_TAG_SIZE];
1469 struct bpf_prog_stats __percpu *stats;
1470 int __percpu *active;
1471 unsigned int (*bpf_func)(const void *ctx,
1472 const struct bpf_insn *insn);
1473 struct bpf_prog_aux *aux; /* Auxiliary fields */
1474 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1475 /* Instructions for interpreter */
1477 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1478 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1482 struct bpf_array_aux {
1483 /* Programs with direct jumps into programs part of this array. */
1484 struct list_head poke_progs;
1485 struct bpf_map *map;
1486 struct mutex poke_mutex;
1487 struct work_struct work;
1493 enum bpf_link_type type;
1494 const struct bpf_link_ops *ops;
1495 struct bpf_prog *prog;
1496 struct work_struct work;
1499 struct bpf_link_ops {
1500 void (*release)(struct bpf_link *link);
1501 void (*dealloc)(struct bpf_link *link);
1502 int (*detach)(struct bpf_link *link);
1503 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1504 struct bpf_prog *old_prog);
1505 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1506 int (*fill_link_info)(const struct bpf_link *link,
1507 struct bpf_link_info *info);
1508 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1509 struct bpf_map *old_map);
1512 struct bpf_tramp_link {
1513 struct bpf_link link;
1514 struct hlist_node tramp_hlist;
1518 struct bpf_shim_tramp_link {
1519 struct bpf_tramp_link link;
1520 struct bpf_trampoline *trampoline;
1523 struct bpf_tracing_link {
1524 struct bpf_tramp_link link;
1525 enum bpf_attach_type attach_type;
1526 struct bpf_trampoline *trampoline;
1527 struct bpf_prog *tgt_prog;
1530 struct bpf_link_primer {
1531 struct bpf_link *link;
1537 struct bpf_struct_ops_value;
1540 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1541 struct bpf_struct_ops {
1542 const struct bpf_verifier_ops *verifier_ops;
1543 int (*init)(struct btf *btf);
1544 int (*check_member)(const struct btf_type *t,
1545 const struct btf_member *member,
1546 const struct bpf_prog *prog);
1547 int (*init_member)(const struct btf_type *t,
1548 const struct btf_member *member,
1549 void *kdata, const void *udata);
1550 int (*reg)(void *kdata);
1551 void (*unreg)(void *kdata);
1552 int (*update)(void *kdata, void *old_kdata);
1553 int (*validate)(void *kdata);
1554 const struct btf_type *type;
1555 const struct btf_type *value_type;
1557 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1562 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1563 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1564 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1565 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1566 bool bpf_struct_ops_get(const void *kdata);
1567 void bpf_struct_ops_put(const void *kdata);
1568 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1570 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1571 struct bpf_tramp_link *link,
1572 const struct btf_func_model *model,
1573 void *image, void *image_end);
1574 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1576 if (owner == BPF_MODULE_OWNER)
1577 return bpf_struct_ops_get(data);
1579 return try_module_get(owner);
1581 static inline void bpf_module_put(const void *data, struct module *owner)
1583 if (owner == BPF_MODULE_OWNER)
1584 bpf_struct_ops_put(data);
1588 int bpf_struct_ops_link_create(union bpf_attr *attr);
1591 /* Define it here to avoid the use of forward declaration */
1592 struct bpf_dummy_ops_state {
1596 struct bpf_dummy_ops {
1597 int (*test_1)(struct bpf_dummy_ops_state *cb);
1598 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1599 char a3, unsigned long a4);
1600 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1603 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1604 union bpf_attr __user *uattr);
1607 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1611 static inline void bpf_struct_ops_init(struct btf *btf,
1612 struct bpf_verifier_log *log)
1615 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1617 return try_module_get(owner);
1619 static inline void bpf_module_put(const void *data, struct module *owner)
1623 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1629 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1636 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1637 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1639 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1641 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1646 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1655 struct bpf_array_aux *aux;
1657 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1658 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1659 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1663 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1664 #define MAX_TAIL_CALL_CNT 33
1666 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1667 * It's enum to expose it (and thus make it discoverable) through BTF.
1670 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1673 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1674 BPF_F_RDONLY_PROG | \
1678 #define BPF_MAP_CAN_READ BIT(0)
1679 #define BPF_MAP_CAN_WRITE BIT(1)
1681 /* Maximum number of user-producer ring buffer samples that can be drained in
1682 * a call to bpf_user_ringbuf_drain().
1684 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1686 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1688 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1690 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1693 if (access_flags & BPF_F_RDONLY_PROG)
1694 return BPF_MAP_CAN_READ;
1695 else if (access_flags & BPF_F_WRONLY_PROG)
1696 return BPF_MAP_CAN_WRITE;
1698 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1701 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1703 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1704 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1707 struct bpf_event_entry {
1708 struct perf_event *event;
1709 struct file *perf_file;
1710 struct file *map_file;
1711 struct rcu_head rcu;
1714 static inline bool map_type_contains_progs(struct bpf_map *map)
1716 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1717 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1718 map->map_type == BPF_MAP_TYPE_CPUMAP;
1721 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1722 int bpf_prog_calc_tag(struct bpf_prog *fp);
1724 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1725 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1727 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1728 unsigned long off, unsigned long len);
1729 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1730 const struct bpf_insn *src,
1731 struct bpf_insn *dst,
1732 struct bpf_prog *prog,
1735 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1736 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1738 /* an array of programs to be executed under rcu_lock.
1741 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
1743 * the structure returned by bpf_prog_array_alloc() should be populated
1744 * with program pointers and the last pointer must be NULL.
1745 * The user has to keep refcnt on the program and make sure the program
1746 * is removed from the array before bpf_prog_put().
1747 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1748 * since other cpus are walking the array of pointers in parallel.
1750 struct bpf_prog_array_item {
1751 struct bpf_prog *prog;
1753 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1758 struct bpf_prog_array {
1759 struct rcu_head rcu;
1760 struct bpf_prog_array_item items[];
1763 struct bpf_empty_prog_array {
1764 struct bpf_prog_array hdr;
1765 struct bpf_prog *null_prog;
1768 /* to avoid allocating empty bpf_prog_array for cgroups that
1769 * don't have bpf program attached use one global 'bpf_empty_prog_array'
1770 * It will not be modified the caller of bpf_prog_array_alloc()
1771 * (since caller requested prog_cnt == 0)
1772 * that pointer should be 'freed' by bpf_prog_array_free()
1774 extern struct bpf_empty_prog_array bpf_empty_prog_array;
1776 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1777 void bpf_prog_array_free(struct bpf_prog_array *progs);
1778 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
1779 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
1780 int bpf_prog_array_length(struct bpf_prog_array *progs);
1781 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1782 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1783 __u32 __user *prog_ids, u32 cnt);
1785 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1786 struct bpf_prog *old_prog);
1787 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1788 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1789 struct bpf_prog *prog);
1790 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1791 u32 *prog_ids, u32 request_cnt,
1793 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1794 struct bpf_prog *exclude_prog,
1795 struct bpf_prog *include_prog,
1797 struct bpf_prog_array **new_array);
1799 struct bpf_run_ctx {};
1801 struct bpf_cg_run_ctx {
1802 struct bpf_run_ctx run_ctx;
1803 const struct bpf_prog_array_item *prog_item;
1807 struct bpf_trace_run_ctx {
1808 struct bpf_run_ctx run_ctx;
1812 struct bpf_tramp_run_ctx {
1813 struct bpf_run_ctx run_ctx;
1815 struct bpf_run_ctx *saved_run_ctx;
1818 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1820 struct bpf_run_ctx *old_ctx = NULL;
1822 #ifdef CONFIG_BPF_SYSCALL
1823 old_ctx = current->bpf_ctx;
1824 current->bpf_ctx = new_ctx;
1829 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1831 #ifdef CONFIG_BPF_SYSCALL
1832 current->bpf_ctx = old_ctx;
1836 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1837 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1838 /* BPF program asks to set CN on the packet. */
1839 #define BPF_RET_SET_CN (1 << 0)
1841 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1843 static __always_inline u32
1844 bpf_prog_run_array(const struct bpf_prog_array *array,
1845 const void *ctx, bpf_prog_run_fn run_prog)
1847 const struct bpf_prog_array_item *item;
1848 const struct bpf_prog *prog;
1849 struct bpf_run_ctx *old_run_ctx;
1850 struct bpf_trace_run_ctx run_ctx;
1853 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
1855 if (unlikely(!array))
1859 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1860 item = &array->items[0];
1861 while ((prog = READ_ONCE(item->prog))) {
1862 run_ctx.bpf_cookie = item->bpf_cookie;
1863 ret &= run_prog(prog, ctx);
1866 bpf_reset_run_ctx(old_run_ctx);
1871 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
1873 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
1874 * overall. As a result, we must use the bpf_prog_array_free_sleepable
1875 * in order to use the tasks_trace rcu grace period.
1877 * When a non-sleepable program is inside the array, we take the rcu read
1878 * section and disable preemption for that program alone, so it can access
1879 * rcu-protected dynamically sized maps.
1881 static __always_inline u32
1882 bpf_prog_run_array_sleepable(const struct bpf_prog_array __rcu *array_rcu,
1883 const void *ctx, bpf_prog_run_fn run_prog)
1885 const struct bpf_prog_array_item *item;
1886 const struct bpf_prog *prog;
1887 const struct bpf_prog_array *array;
1888 struct bpf_run_ctx *old_run_ctx;
1889 struct bpf_trace_run_ctx run_ctx;
1894 rcu_read_lock_trace();
1897 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());
1898 if (unlikely(!array))
1900 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1901 item = &array->items[0];
1902 while ((prog = READ_ONCE(item->prog))) {
1903 if (!prog->aux->sleepable)
1906 run_ctx.bpf_cookie = item->bpf_cookie;
1907 ret &= run_prog(prog, ctx);
1910 if (!prog->aux->sleepable)
1913 bpf_reset_run_ctx(old_run_ctx);
1916 rcu_read_unlock_trace();
1920 #ifdef CONFIG_BPF_SYSCALL
1921 DECLARE_PER_CPU(int, bpf_prog_active);
1922 extern struct mutex bpf_stats_enabled_mutex;
1925 * Block execution of BPF programs attached to instrumentation (perf,
1926 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1927 * these events can happen inside a region which holds a map bucket lock
1928 * and can deadlock on it.
1930 static inline void bpf_disable_instrumentation(void)
1933 this_cpu_inc(bpf_prog_active);
1936 static inline void bpf_enable_instrumentation(void)
1938 this_cpu_dec(bpf_prog_active);
1942 extern const struct file_operations bpf_map_fops;
1943 extern const struct file_operations bpf_prog_fops;
1944 extern const struct file_operations bpf_iter_fops;
1946 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1947 extern const struct bpf_prog_ops _name ## _prog_ops; \
1948 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1949 #define BPF_MAP_TYPE(_id, _ops) \
1950 extern const struct bpf_map_ops _ops;
1951 #define BPF_LINK_TYPE(_id, _name)
1952 #include <linux/bpf_types.h>
1953 #undef BPF_PROG_TYPE
1955 #undef BPF_LINK_TYPE
1957 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1958 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1959 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1961 struct bpf_prog *bpf_prog_get(u32 ufd);
1962 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1964 void bpf_prog_add(struct bpf_prog *prog, int i);
1965 void bpf_prog_sub(struct bpf_prog *prog, int i);
1966 void bpf_prog_inc(struct bpf_prog *prog);
1967 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1968 void bpf_prog_put(struct bpf_prog *prog);
1970 void bpf_prog_free_id(struct bpf_prog *prog);
1971 void bpf_map_free_id(struct bpf_map *map);
1973 struct btf_field *btf_record_find(const struct btf_record *rec,
1974 u32 offset, u32 field_mask);
1975 void btf_record_free(struct btf_record *rec);
1976 void bpf_map_free_record(struct bpf_map *map);
1977 struct btf_record *btf_record_dup(const struct btf_record *rec);
1978 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
1979 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
1980 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
1982 struct bpf_map *bpf_map_get(u32 ufd);
1983 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1984 struct bpf_map *__bpf_map_get(struct fd f);
1985 void bpf_map_inc(struct bpf_map *map);
1986 void bpf_map_inc_with_uref(struct bpf_map *map);
1987 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
1988 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1989 void bpf_map_put_with_uref(struct bpf_map *map);
1990 void bpf_map_put(struct bpf_map *map);
1991 void *bpf_map_area_alloc(u64 size, int numa_node);
1992 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1993 void bpf_map_area_free(void *base);
1994 bool bpf_map_write_active(const struct bpf_map *map);
1995 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1996 int generic_map_lookup_batch(struct bpf_map *map,
1997 const union bpf_attr *attr,
1998 union bpf_attr __user *uattr);
1999 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2000 const union bpf_attr *attr,
2001 union bpf_attr __user *uattr);
2002 int generic_map_delete_batch(struct bpf_map *map,
2003 const union bpf_attr *attr,
2004 union bpf_attr __user *uattr);
2005 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2006 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2008 #ifdef CONFIG_MEMCG_KMEM
2009 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2011 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2012 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2014 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2015 size_t align, gfp_t flags);
2017 static inline void *
2018 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2021 return kmalloc_node(size, flags, node);
2024 static inline void *
2025 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
2027 return kzalloc(size, flags);
2030 static inline void *
2031 bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
2033 return kvcalloc(n, size, flags);
2036 static inline void __percpu *
2037 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
2040 return __alloc_percpu_gfp(size, align, flags);
2044 extern int sysctl_unprivileged_bpf_disabled;
2046 static inline bool bpf_allow_ptr_leaks(void)
2048 return perfmon_capable();
2051 static inline bool bpf_allow_uninit_stack(void)
2053 return perfmon_capable();
2056 static inline bool bpf_bypass_spec_v1(void)
2058 return perfmon_capable();
2061 static inline bool bpf_bypass_spec_v4(void)
2063 return perfmon_capable();
2066 int bpf_map_new_fd(struct bpf_map *map, int flags);
2067 int bpf_prog_new_fd(struct bpf_prog *prog);
2069 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2070 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2071 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2072 int bpf_link_settle(struct bpf_link_primer *primer);
2073 void bpf_link_cleanup(struct bpf_link_primer *primer);
2074 void bpf_link_inc(struct bpf_link *link);
2075 void bpf_link_put(struct bpf_link *link);
2076 int bpf_link_new_fd(struct bpf_link *link);
2077 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
2078 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2079 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2081 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
2082 int bpf_obj_get_user(const char __user *pathname, int flags);
2084 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2085 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2086 extern int bpf_iter_ ## target(args); \
2087 int __init bpf_iter_ ## target(args) { return 0; }
2090 * The task type of iterators.
2092 * For BPF task iterators, they can be parameterized with various
2093 * parameters to visit only some of tasks.
2095 * BPF_TASK_ITER_ALL (default)
2096 * Iterate over resources of every task.
2099 * Iterate over resources of a task/tid.
2101 * BPF_TASK_ITER_TGID
2102 * Iterate over resources of every task of a process / task group.
2104 enum bpf_iter_task_type {
2105 BPF_TASK_ITER_ALL = 0,
2110 struct bpf_iter_aux_info {
2111 /* for map_elem iter */
2112 struct bpf_map *map;
2114 /* for cgroup iter */
2116 struct cgroup *start; /* starting cgroup */
2117 enum bpf_cgroup_iter_order order;
2120 enum bpf_iter_task_type type;
2125 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2126 union bpf_iter_link_info *linfo,
2127 struct bpf_iter_aux_info *aux);
2128 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2129 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2130 struct seq_file *seq);
2131 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2132 struct bpf_link_info *info);
2133 typedef const struct bpf_func_proto *
2134 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2135 const struct bpf_prog *prog);
2137 enum bpf_iter_feature {
2138 BPF_ITER_RESCHED = BIT(0),
2141 #define BPF_ITER_CTX_ARG_MAX 2
2142 struct bpf_iter_reg {
2144 bpf_iter_attach_target_t attach_target;
2145 bpf_iter_detach_target_t detach_target;
2146 bpf_iter_show_fdinfo_t show_fdinfo;
2147 bpf_iter_fill_link_info_t fill_link_info;
2148 bpf_iter_get_func_proto_t get_func_proto;
2149 u32 ctx_arg_info_size;
2151 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2152 const struct bpf_iter_seq_info *seq_info;
2155 struct bpf_iter_meta {
2156 __bpf_md_ptr(struct seq_file *, seq);
2161 struct bpf_iter__bpf_map_elem {
2162 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2163 __bpf_md_ptr(struct bpf_map *, map);
2164 __bpf_md_ptr(void *, key);
2165 __bpf_md_ptr(void *, value);
2168 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2169 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2170 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2171 const struct bpf_func_proto *
2172 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2173 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2174 int bpf_iter_new_fd(struct bpf_link *link);
2175 bool bpf_link_is_iter(struct bpf_link *link);
2176 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2177 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2178 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2179 struct seq_file *seq);
2180 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2181 struct bpf_link_info *info);
2183 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2184 struct bpf_func_state *caller,
2185 struct bpf_func_state *callee);
2187 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2188 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2189 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2191 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2194 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2196 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2197 void *key, void *value, u64 map_flags);
2198 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2199 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2200 void *key, void *value, u64 map_flags);
2201 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2203 int bpf_get_file_flag(int flags);
2204 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2205 size_t actual_size);
2207 /* verify correctness of eBPF program */
2208 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2210 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2211 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2214 struct btf *bpf_get_btf_vmlinux(void);
2219 struct bpf_dtab_netdev;
2220 struct bpf_cpu_map_entry;
2222 void __dev_flush(void);
2223 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2224 struct net_device *dev_rx);
2225 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2226 struct net_device *dev_rx);
2227 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2228 struct bpf_map *map, bool exclude_ingress);
2229 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2230 struct bpf_prog *xdp_prog);
2231 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2232 struct bpf_prog *xdp_prog, struct bpf_map *map,
2233 bool exclude_ingress);
2235 void __cpu_map_flush(void);
2236 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2237 struct net_device *dev_rx);
2238 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2239 struct sk_buff *skb);
2241 /* Return map's numa specified by userspace */
2242 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2244 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2245 attr->numa_node : NUMA_NO_NODE;
2248 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2249 int array_map_alloc_check(union bpf_attr *attr);
2251 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2252 union bpf_attr __user *uattr);
2253 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2254 union bpf_attr __user *uattr);
2255 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2256 const union bpf_attr *kattr,
2257 union bpf_attr __user *uattr);
2258 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2259 const union bpf_attr *kattr,
2260 union bpf_attr __user *uattr);
2261 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2262 const union bpf_attr *kattr,
2263 union bpf_attr __user *uattr);
2264 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2265 const union bpf_attr *kattr,
2266 union bpf_attr __user *uattr);
2267 int bpf_prog_test_run_nf(struct bpf_prog *prog,
2268 const union bpf_attr *kattr,
2269 union bpf_attr __user *uattr);
2270 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2271 const struct bpf_prog *prog,
2272 struct bpf_insn_access_aux *info);
2274 static inline bool bpf_tracing_ctx_access(int off, int size,
2275 enum bpf_access_type type)
2277 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2279 if (type != BPF_READ)
2281 if (off % size != 0)
2286 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2287 enum bpf_access_type type,
2288 const struct bpf_prog *prog,
2289 struct bpf_insn_access_aux *info)
2291 if (!bpf_tracing_ctx_access(off, size, type))
2293 return btf_ctx_access(off, size, type, prog, info);
2296 int btf_struct_access(struct bpf_verifier_log *log,
2297 const struct bpf_reg_state *reg,
2298 int off, int size, enum bpf_access_type atype,
2299 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2300 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2301 const struct btf *btf, u32 id, int off,
2302 const struct btf *need_btf, u32 need_type_id,
2305 int btf_distill_func_proto(struct bpf_verifier_log *log,
2307 const struct btf_type *func_proto,
2308 const char *func_name,
2309 struct btf_func_model *m);
2311 struct bpf_reg_state;
2312 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
2313 struct bpf_reg_state *regs);
2314 int btf_check_subprog_call(struct bpf_verifier_env *env, int subprog,
2315 struct bpf_reg_state *regs);
2316 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
2317 struct bpf_reg_state *reg);
2318 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2319 struct btf *btf, const struct btf_type *t);
2321 struct bpf_prog *bpf_prog_by_id(u32 id);
2322 struct bpf_link *bpf_link_by_id(u32 id);
2324 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
2325 void bpf_task_storage_free(struct task_struct *task);
2326 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2327 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2328 const struct btf_func_model *
2329 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2330 const struct bpf_insn *insn);
2331 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2332 u16 btf_fd_idx, u8 **func_addr);
2334 struct bpf_core_ctx {
2335 struct bpf_verifier_log *log;
2336 const struct btf *btf;
2339 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2340 const struct bpf_reg_state *reg,
2341 const char *field_name, u32 btf_id, const char *suffix);
2343 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2344 const struct btf *reg_btf, u32 reg_id,
2345 const struct btf *arg_btf, u32 arg_id);
2347 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2348 int relo_idx, void *insn);
2350 static inline bool unprivileged_ebpf_enabled(void)
2352 return !sysctl_unprivileged_bpf_disabled;
2355 /* Not all bpf prog type has the bpf_ctx.
2356 * For the bpf prog type that has initialized the bpf_ctx,
2357 * this function can be used to decide if a kernel function
2358 * is called by a bpf program.
2360 static inline bool has_current_bpf_ctx(void)
2362 return !!current->bpf_ctx;
2365 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2367 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2368 enum bpf_dynptr_type type, u32 offset, u32 size);
2369 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2370 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2371 #else /* !CONFIG_BPF_SYSCALL */
2372 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2374 return ERR_PTR(-EOPNOTSUPP);
2377 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2378 enum bpf_prog_type type,
2381 return ERR_PTR(-EOPNOTSUPP);
2384 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2388 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2392 static inline void bpf_prog_put(struct bpf_prog *prog)
2396 static inline void bpf_prog_inc(struct bpf_prog *prog)
2400 static inline struct bpf_prog *__must_check
2401 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2403 return ERR_PTR(-EOPNOTSUPP);
2406 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2407 const struct bpf_link_ops *ops,
2408 struct bpf_prog *prog)
2412 static inline int bpf_link_prime(struct bpf_link *link,
2413 struct bpf_link_primer *primer)
2418 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2423 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2427 static inline void bpf_link_inc(struct bpf_link *link)
2431 static inline void bpf_link_put(struct bpf_link *link)
2435 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2440 static inline void __dev_flush(void)
2445 struct bpf_dtab_netdev;
2446 struct bpf_cpu_map_entry;
2449 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2450 struct net_device *dev_rx)
2456 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2457 struct net_device *dev_rx)
2463 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2464 struct bpf_map *map, bool exclude_ingress)
2471 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2472 struct sk_buff *skb,
2473 struct bpf_prog *xdp_prog)
2479 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2480 struct bpf_prog *xdp_prog, struct bpf_map *map,
2481 bool exclude_ingress)
2486 static inline void __cpu_map_flush(void)
2490 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2491 struct xdp_frame *xdpf,
2492 struct net_device *dev_rx)
2497 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2498 struct sk_buff *skb)
2503 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2504 enum bpf_prog_type type)
2506 return ERR_PTR(-EOPNOTSUPP);
2509 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2510 const union bpf_attr *kattr,
2511 union bpf_attr __user *uattr)
2516 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2517 const union bpf_attr *kattr,
2518 union bpf_attr __user *uattr)
2523 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2524 const union bpf_attr *kattr,
2525 union bpf_attr __user *uattr)
2530 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2531 const union bpf_attr *kattr,
2532 union bpf_attr __user *uattr)
2537 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2538 const union bpf_attr *kattr,
2539 union bpf_attr __user *uattr)
2544 static inline void bpf_map_put(struct bpf_map *map)
2548 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2550 return ERR_PTR(-ENOTSUPP);
2553 static inline int btf_struct_access(struct bpf_verifier_log *log,
2554 const struct bpf_reg_state *reg,
2555 int off, int size, enum bpf_access_type atype,
2556 u32 *next_btf_id, enum bpf_type_flag *flag,
2557 const char **field_name)
2562 static inline const struct bpf_func_proto *
2563 bpf_base_func_proto(enum bpf_func_id func_id)
2568 static inline void bpf_task_storage_free(struct task_struct *task)
2572 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2577 static inline const struct btf_func_model *
2578 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2579 const struct bpf_insn *insn)
2585 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2586 u16 btf_fd_idx, u8 **func_addr)
2591 static inline bool unprivileged_ebpf_enabled(void)
2596 static inline bool has_current_bpf_ctx(void)
2601 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2605 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
2609 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2610 enum bpf_dynptr_type type, u32 offset, u32 size)
2614 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
2618 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
2621 #endif /* CONFIG_BPF_SYSCALL */
2623 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2624 struct btf_mod_pair *used_btfs, u32 len);
2626 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2627 enum bpf_prog_type type)
2629 return bpf_prog_get_type_dev(ufd, type, false);
2632 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2633 struct bpf_map **used_maps, u32 len);
2635 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2637 int bpf_prog_offload_compile(struct bpf_prog *prog);
2638 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
2639 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2640 struct bpf_prog *prog);
2642 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2644 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2645 int bpf_map_offload_update_elem(struct bpf_map *map,
2646 void *key, void *value, u64 flags);
2647 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2648 int bpf_map_offload_get_next_key(struct bpf_map *map,
2649 void *key, void *next_key);
2651 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2653 struct bpf_offload_dev *
2654 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2655 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2656 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2657 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2658 struct net_device *netdev);
2659 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2660 struct net_device *netdev);
2661 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2663 void unpriv_ebpf_notify(int new_state);
2665 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2666 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2667 struct bpf_prog_aux *prog_aux);
2668 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
2669 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
2670 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
2671 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
2673 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2675 return aux->dev_bound;
2678 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
2680 return aux->offload_requested;
2683 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
2685 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2687 return unlikely(map->ops == &bpf_map_offload_ops);
2690 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2691 void bpf_map_offload_map_free(struct bpf_map *map);
2692 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
2693 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2694 const union bpf_attr *kattr,
2695 union bpf_attr __user *uattr);
2697 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2698 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2699 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2700 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2701 union bpf_attr __user *uattr);
2703 void sock_map_unhash(struct sock *sk);
2704 void sock_map_destroy(struct sock *sk);
2705 void sock_map_close(struct sock *sk, long timeout);
2707 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2708 struct bpf_prog_aux *prog_aux)
2713 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
2719 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
2720 union bpf_attr *attr)
2725 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
2726 struct bpf_prog *old_prog)
2731 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
2735 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2740 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
2745 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
2750 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2755 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2757 return ERR_PTR(-EOPNOTSUPP);
2760 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2764 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
2769 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2770 const union bpf_attr *kattr,
2771 union bpf_attr __user *uattr)
2776 #ifdef CONFIG_BPF_SYSCALL
2777 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2778 struct bpf_prog *prog)
2783 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2784 enum bpf_prog_type ptype)
2789 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2795 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2796 union bpf_attr __user *uattr)
2800 #endif /* CONFIG_BPF_SYSCALL */
2801 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2803 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2804 void bpf_sk_reuseport_detach(struct sock *sk);
2805 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2807 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2808 void *value, u64 map_flags);
2810 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2814 #ifdef CONFIG_BPF_SYSCALL
2815 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2816 void *key, void *value)
2821 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2822 void *key, void *value,
2827 #endif /* CONFIG_BPF_SYSCALL */
2828 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2830 /* verifier prototypes for helper functions called from eBPF programs */
2831 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2832 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2833 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2834 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2835 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2836 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2837 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
2839 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2840 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2841 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2842 extern const struct bpf_func_proto bpf_tail_call_proto;
2843 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2844 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2845 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
2846 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2847 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2848 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2849 extern const struct bpf_func_proto bpf_get_stackid_proto;
2850 extern const struct bpf_func_proto bpf_get_stack_proto;
2851 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2852 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2853 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2854 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2855 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2856 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2857 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2858 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
2859 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2860 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2861 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2862 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2863 extern const struct bpf_func_proto bpf_spin_lock_proto;
2864 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2865 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2866 extern const struct bpf_func_proto bpf_strtol_proto;
2867 extern const struct bpf_func_proto bpf_strtoul_proto;
2868 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2869 extern const struct bpf_func_proto bpf_jiffies64_proto;
2870 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2871 extern const struct bpf_func_proto bpf_event_output_data_proto;
2872 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2873 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2874 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2875 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2876 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2877 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
2878 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
2879 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
2880 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2881 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2882 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2883 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2884 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2885 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
2886 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
2887 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2888 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2889 extern const struct bpf_func_proto bpf_snprintf_proto;
2890 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2891 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2892 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2893 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2894 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2895 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
2896 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2897 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
2898 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2899 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2900 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2901 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2902 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2903 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
2904 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
2905 extern const struct bpf_func_proto bpf_find_vma_proto;
2906 extern const struct bpf_func_proto bpf_loop_proto;
2907 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
2908 extern const struct bpf_func_proto bpf_set_retval_proto;
2909 extern const struct bpf_func_proto bpf_get_retval_proto;
2910 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
2911 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
2912 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
2914 const struct bpf_func_proto *tracing_prog_func_proto(
2915 enum bpf_func_id func_id, const struct bpf_prog *prog);
2917 /* Shared helpers among cBPF and eBPF. */
2918 void bpf_user_rnd_init_once(void);
2919 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2920 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2922 #if defined(CONFIG_NET)
2923 bool bpf_sock_common_is_valid_access(int off, int size,
2924 enum bpf_access_type type,
2925 struct bpf_insn_access_aux *info);
2926 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2927 struct bpf_insn_access_aux *info);
2928 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2929 const struct bpf_insn *si,
2930 struct bpf_insn *insn_buf,
2931 struct bpf_prog *prog,
2933 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
2934 struct bpf_dynptr_kern *ptr);
2936 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2937 enum bpf_access_type type,
2938 struct bpf_insn_access_aux *info)
2942 static inline bool bpf_sock_is_valid_access(int off, int size,
2943 enum bpf_access_type type,
2944 struct bpf_insn_access_aux *info)
2948 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2949 const struct bpf_insn *si,
2950 struct bpf_insn *insn_buf,
2951 struct bpf_prog *prog,
2956 static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
2957 struct bpf_dynptr_kern *ptr)
2964 struct sk_reuseport_kern {
2965 struct sk_buff *skb;
2967 struct sock *selected_sk;
2968 struct sock *migrating_sk;
2974 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2975 struct bpf_insn_access_aux *info);
2977 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2978 const struct bpf_insn *si,
2979 struct bpf_insn *insn_buf,
2980 struct bpf_prog *prog,
2983 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2984 struct bpf_insn_access_aux *info);
2986 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2987 const struct bpf_insn *si,
2988 struct bpf_insn *insn_buf,
2989 struct bpf_prog *prog,
2992 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2993 enum bpf_access_type type,
2994 struct bpf_insn_access_aux *info)
2999 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3000 const struct bpf_insn *si,
3001 struct bpf_insn *insn_buf,
3002 struct bpf_prog *prog,
3007 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3008 enum bpf_access_type type,
3009 struct bpf_insn_access_aux *info)
3014 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3015 const struct bpf_insn *si,
3016 struct bpf_insn *insn_buf,
3017 struct bpf_prog *prog,
3022 #endif /* CONFIG_INET */
3024 enum bpf_text_poke_type {
3029 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3030 void *addr1, void *addr2);
3032 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3033 int bpf_arch_text_invalidate(void *dst, size_t len);
3036 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3038 #define MAX_BPRINTF_VARARGS 12
3039 #define MAX_BPRINTF_BUF 1024
3041 struct bpf_bprintf_data {
3048 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3049 u32 num_args, struct bpf_bprintf_data *data);
3050 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3052 #ifdef CONFIG_BPF_LSM
3053 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3054 void bpf_cgroup_atype_put(int cgroup_atype);
3056 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
3057 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3058 #endif /* CONFIG_BPF_LSM */
3067 #endif /* CONFIG_KEYS */
3069 static inline bool type_is_alloc(u32 type)
3071 return type & MEM_ALLOC;
3074 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3076 if (memcg_bpf_enabled())
3077 return flags | __GFP_ACCOUNT;
3081 #endif /* _LINUX_BPF_H */