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 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
100 int (*map_delete_elem)(struct bpf_map *map, void *key);
101 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
102 int (*map_pop_elem)(struct bpf_map *map, void *value);
103 int (*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 int (*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 int (*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,
192 typedef void (*btf_dtor_kfunc_t)(void *);
194 struct btf_field_kptr {
196 struct module *module;
197 /* dtor used if btf_is_kernel(btf), otherwise the type is
198 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
200 btf_dtor_kfunc_t dtor;
204 struct btf_field_graph_root {
208 struct btf_record *value_rec;
213 enum btf_field_type type;
215 struct btf_field_kptr kptr;
216 struct btf_field_graph_root graph_root;
225 struct btf_field fields[];
228 struct btf_field_offs {
230 u32 field_off[BTF_FIELDS_MAX];
231 u8 field_sz[BTF_FIELDS_MAX];
235 /* The first two cachelines with read-mostly members of which some
236 * are also accessed in fast-path (e.g. ops, max_entries).
238 const struct bpf_map_ops *ops ____cacheline_aligned;
239 struct bpf_map *inner_map_meta;
240 #ifdef CONFIG_SECURITY
243 enum bpf_map_type map_type;
247 u64 map_extra; /* any per-map-type extra fields */
250 struct btf_record *record;
253 u32 btf_value_type_id;
254 u32 btf_vmlinux_value_type_id;
256 #ifdef CONFIG_MEMCG_KMEM
257 struct obj_cgroup *objcg;
259 char name[BPF_OBJ_NAME_LEN];
260 struct btf_field_offs *field_offs;
261 /* The 3rd and 4th cacheline with misc members to avoid false sharing
262 * particularly with refcounting.
264 atomic64_t refcnt ____cacheline_aligned;
266 struct work_struct work;
267 struct mutex freeze_mutex;
269 /* 'Ownership' of program-containing map is claimed by the first program
270 * that is going to use this map or by the first program which FD is
271 * stored in the map to make sure that all callers and callees have the
272 * same prog type, JITed flag and xdp_has_frags flag.
276 enum bpf_prog_type type;
281 bool frozen; /* write-once; write-protected by freeze_mutex */
284 static inline const char *btf_field_type_name(enum btf_field_type type)
288 return "bpf_spin_lock";
295 return "bpf_list_head";
297 return "bpf_list_node";
299 return "bpf_rb_root";
301 return "bpf_rb_node";
308 static inline u32 btf_field_type_size(enum btf_field_type type)
312 return sizeof(struct bpf_spin_lock);
314 return sizeof(struct bpf_timer);
319 return sizeof(struct bpf_list_head);
321 return sizeof(struct bpf_list_node);
323 return sizeof(struct bpf_rb_root);
325 return sizeof(struct bpf_rb_node);
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);
356 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
358 if (IS_ERR_OR_NULL(rec))
360 return rec->field_mask & type;
363 static inline void bpf_obj_init(const struct btf_field_offs *foffs, void *obj)
369 for (i = 0; i < foffs->cnt; i++)
370 memset(obj + foffs->field_off[i], 0, foffs->field_sz[i]);
373 /* 'dst' must be a temporary buffer and should not point to memory that is being
374 * used in parallel by a bpf program or bpf syscall, otherwise the access from
375 * the bpf program or bpf syscall may be corrupted by the reinitialization,
376 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
377 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
378 * program or bpf syscall.
380 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
382 bpf_obj_init(map->field_offs, dst);
385 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
386 * forced to use 'long' read/writes to try to atomically copy long counters.
387 * Best-effort only. No barriers here, since it _will_ race with concurrent
388 * updates from BPF programs. Called from bpf syscall and mostly used with
389 * size 8 or 16 bytes, so ask compiler to inline it.
391 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
393 const long *lsrc = src;
396 size /= sizeof(long);
401 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
402 static inline void bpf_obj_memcpy(struct btf_field_offs *foffs,
403 void *dst, void *src, u32 size,
409 if (likely(!foffs)) {
411 bpf_long_memcpy(dst, src, round_up(size, 8));
413 memcpy(dst, src, size);
417 for (i = 0; i < foffs->cnt; i++) {
418 u32 next_off = foffs->field_off[i];
419 u32 sz = next_off - curr_off;
421 memcpy(dst + curr_off, src + curr_off, sz);
422 curr_off += foffs->field_sz[i] + sz;
424 memcpy(dst + curr_off, src + curr_off, size - curr_off);
427 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
429 bpf_obj_memcpy(map->field_offs, dst, src, map->value_size, false);
432 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
434 bpf_obj_memcpy(map->field_offs, dst, src, map->value_size, true);
437 static inline void bpf_obj_memzero(struct btf_field_offs *foffs, void *dst, u32 size)
442 if (likely(!foffs)) {
443 memset(dst, 0, size);
447 for (i = 0; i < foffs->cnt; i++) {
448 u32 next_off = foffs->field_off[i];
449 u32 sz = next_off - curr_off;
451 memset(dst + curr_off, 0, sz);
452 curr_off += foffs->field_sz[i] + sz;
454 memset(dst + curr_off, 0, size - curr_off);
457 static inline void zero_map_value(struct bpf_map *map, void *dst)
459 bpf_obj_memzero(map->field_offs, dst, map->value_size);
462 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
464 void bpf_timer_cancel_and_free(void *timer);
465 void bpf_list_head_free(const struct btf_field *field, void *list_head,
466 struct bpf_spin_lock *spin_lock);
467 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
468 struct bpf_spin_lock *spin_lock);
471 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
473 struct bpf_offload_dev;
474 struct bpf_offloaded_map;
476 struct bpf_map_dev_ops {
477 int (*map_get_next_key)(struct bpf_offloaded_map *map,
478 void *key, void *next_key);
479 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
480 void *key, void *value);
481 int (*map_update_elem)(struct bpf_offloaded_map *map,
482 void *key, void *value, u64 flags);
483 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
486 struct bpf_offloaded_map {
488 struct net_device *netdev;
489 const struct bpf_map_dev_ops *dev_ops;
491 struct list_head offloads;
494 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
496 return container_of(map, struct bpf_offloaded_map, map);
499 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
501 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
504 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
506 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
507 map->ops->map_seq_show_elem;
510 int map_check_no_btf(const struct bpf_map *map,
511 const struct btf *btf,
512 const struct btf_type *key_type,
513 const struct btf_type *value_type);
515 bool bpf_map_meta_equal(const struct bpf_map *meta0,
516 const struct bpf_map *meta1);
518 extern const struct bpf_map_ops bpf_map_offload_ops;
520 /* bpf_type_flag contains a set of flags that are applicable to the values of
521 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
522 * or a memory is read-only. We classify types into two categories: base types
523 * and extended types. Extended types are base types combined with a type flag.
525 * Currently there are no more than 32 base types in arg_type, ret_type and
528 #define BPF_BASE_TYPE_BITS 8
531 /* PTR may be NULL. */
532 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
534 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
535 * compatible with both mutable and immutable memory.
537 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
539 /* MEM points to BPF ring buffer reservation. */
540 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
542 /* MEM is in user address space. */
543 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
545 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
546 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
547 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
548 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
549 * to the specified cpu.
551 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
553 /* Indicates that the argument will be released. */
554 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
556 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
557 * unreferenced and referenced kptr loaded from map value using a load
558 * instruction, so that they can only be dereferenced but not escape the
559 * BPF program into the kernel (i.e. cannot be passed as arguments to
560 * kfunc or bpf helpers).
562 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
564 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
566 /* DYNPTR points to memory local to the bpf program. */
567 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
569 /* DYNPTR points to a kernel-produced ringbuf record. */
570 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
572 /* Size is known at compile time. */
573 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
575 /* MEM is of an allocated object of type in program BTF. This is used to
576 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
578 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
580 /* PTR was passed from the kernel in a trusted context, and may be
581 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
582 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
583 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
584 * without invoking bpf_kptr_xchg(). What we really need to know is
585 * whether a pointer is safe to pass to a kfunc or BPF helper function.
586 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
587 * helpers, they do not cover all possible instances of unsafe
588 * pointers. For example, a pointer that was obtained from walking a
589 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
590 * fact that it may be NULL, invalid, etc. This is due to backwards
591 * compatibility requirements, as this was the behavior that was first
592 * introduced when kptrs were added. The behavior is now considered
593 * deprecated, and PTR_UNTRUSTED will eventually be removed.
595 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
596 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
597 * For example, pointers passed to tracepoint arguments are considered
598 * PTR_TRUSTED, as are pointers that are passed to struct_ops
599 * callbacks. As alluded to above, pointers that are obtained from
600 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
601 * struct task_struct *task is PTR_TRUSTED, then accessing
602 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
603 * in a BPF register. Similarly, pointers passed to certain programs
604 * types such as kretprobes are not guaranteed to be valid, as they may
605 * for example contain an object that was recently freed.
607 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
609 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
610 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
612 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
613 * Currently only valid for linked-list and rbtree nodes.
615 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
617 /* DYNPTR points to sk_buff */
618 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
620 /* DYNPTR points to xdp_buff */
621 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
624 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
627 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
630 /* Max number of base types. */
631 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
633 /* Max number of all types. */
634 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
636 /* function argument constraints */
638 ARG_DONTCARE = 0, /* unused argument in helper function */
640 /* the following constraints used to prototype
641 * bpf_map_lookup/update/delete_elem() functions
643 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
644 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
645 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
647 /* Used to prototype bpf_memcmp() and other functions that access data
648 * on eBPF program stack
650 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
652 ARG_CONST_SIZE, /* number of bytes accessed from memory */
653 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
655 ARG_PTR_TO_CTX, /* pointer to context */
656 ARG_ANYTHING, /* any (initialized) argument is ok */
657 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
658 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
659 ARG_PTR_TO_INT, /* pointer to int */
660 ARG_PTR_TO_LONG, /* pointer to long */
661 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
662 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
663 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
664 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
665 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
666 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
667 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
668 ARG_PTR_TO_STACK, /* pointer to stack */
669 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
670 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
671 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */
672 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
675 /* Extended arg_types. */
676 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
677 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
678 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
679 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
680 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
681 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
682 /* pointer to memory does not need to be initialized, helper function must fill
683 * all bytes or clear them in error case.
685 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM,
686 /* Pointer to valid memory of size known at compile time. */
687 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
689 /* This must be the last entry. Its purpose is to ensure the enum is
690 * wide enough to hold the higher bits reserved for bpf_type_flag.
692 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
694 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
696 /* type of values returned from helper functions */
697 enum bpf_return_type {
698 RET_INTEGER, /* function returns integer */
699 RET_VOID, /* function doesn't return anything */
700 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
701 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
702 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
703 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
704 RET_PTR_TO_MEM, /* returns a pointer to memory */
705 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
706 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
709 /* Extended ret_types. */
710 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
711 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
712 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
713 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
714 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
715 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
716 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
717 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
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_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
724 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
726 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
727 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
728 * instructions after verifying
730 struct bpf_func_proto {
731 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
735 enum bpf_return_type ret_type;
738 enum bpf_arg_type arg1_type;
739 enum bpf_arg_type arg2_type;
740 enum bpf_arg_type arg3_type;
741 enum bpf_arg_type arg4_type;
742 enum bpf_arg_type arg5_type;
744 enum bpf_arg_type arg_type[5];
764 int *ret_btf_id; /* return value btf_id */
765 bool (*allowed)(const struct bpf_prog *prog);
768 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
769 * the first argument to eBPF programs.
770 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
774 enum bpf_access_type {
779 /* types of values stored in eBPF registers */
780 /* Pointer types represent:
783 * pointer + (u16) var
784 * pointer + (u16) var + imm
785 * if (range > 0) then [ptr, ptr + range - off) is safe to access
786 * if (id > 0) means that some 'var' was added
787 * if (off > 0) means that 'imm' was added
790 NOT_INIT = 0, /* nothing was written into register */
791 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
792 PTR_TO_CTX, /* reg points to bpf_context */
793 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
794 PTR_TO_MAP_VALUE, /* reg points to map element value */
795 PTR_TO_MAP_KEY, /* reg points to a map element key */
796 PTR_TO_STACK, /* reg == frame_pointer + offset */
797 PTR_TO_PACKET_META, /* skb->data - meta_len */
798 PTR_TO_PACKET, /* reg points to skb->data */
799 PTR_TO_PACKET_END, /* skb->data + headlen */
800 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
801 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
802 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
803 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
804 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
805 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
806 /* PTR_TO_BTF_ID points to a kernel struct that does not need
807 * to be null checked by the BPF program. This does not imply the
808 * pointer is _not_ null and in practice this can easily be a null
809 * pointer when reading pointer chains. The assumption is program
810 * context will handle null pointer dereference typically via fault
811 * handling. The verifier must keep this in mind and can make no
812 * assumptions about null or non-null when doing branch analysis.
813 * Further, when passed into helpers the helpers can not, without
814 * additional context, assume the value is non-null.
817 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
818 * been checked for null. Used primarily to inform the verifier
819 * an explicit null check is required for this struct.
821 PTR_TO_MEM, /* reg points to valid memory region */
822 PTR_TO_BUF, /* reg points to a read/write buffer */
823 PTR_TO_FUNC, /* reg points to a bpf program function */
824 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
827 /* Extended reg_types. */
828 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
829 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
830 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
831 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
832 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
834 /* This must be the last entry. Its purpose is to ensure the enum is
835 * wide enough to hold the higher bits reserved for bpf_type_flag.
837 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
839 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
841 /* The information passed from prog-specific *_is_valid_access
842 * back to the verifier.
844 struct bpf_insn_access_aux {
845 enum bpf_reg_type reg_type;
853 struct bpf_verifier_log *log; /* for verbose logs */
857 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
859 aux->ctx_field_size = size;
862 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
864 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
865 insn->src_reg == BPF_PSEUDO_FUNC;
868 struct bpf_prog_ops {
869 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
870 union bpf_attr __user *uattr);
873 struct bpf_reg_state;
874 struct bpf_verifier_ops {
875 /* return eBPF function prototype for verification */
876 const struct bpf_func_proto *
877 (*get_func_proto)(enum bpf_func_id func_id,
878 const struct bpf_prog *prog);
880 /* return true if 'size' wide access at offset 'off' within bpf_context
881 * with 'type' (read or write) is allowed
883 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
884 const struct bpf_prog *prog,
885 struct bpf_insn_access_aux *info);
886 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
887 const struct bpf_prog *prog);
888 int (*gen_ld_abs)(const struct bpf_insn *orig,
889 struct bpf_insn *insn_buf);
890 u32 (*convert_ctx_access)(enum bpf_access_type type,
891 const struct bpf_insn *src,
892 struct bpf_insn *dst,
893 struct bpf_prog *prog, u32 *target_size);
894 int (*btf_struct_access)(struct bpf_verifier_log *log,
895 const struct bpf_reg_state *reg,
896 int off, int size, enum bpf_access_type atype,
897 u32 *next_btf_id, enum bpf_type_flag *flag);
900 struct bpf_prog_offload_ops {
901 /* verifier basic callbacks */
902 int (*insn_hook)(struct bpf_verifier_env *env,
903 int insn_idx, int prev_insn_idx);
904 int (*finalize)(struct bpf_verifier_env *env);
905 /* verifier optimization callbacks (called after .finalize) */
906 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
907 struct bpf_insn *insn);
908 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
909 /* program management callbacks */
910 int (*prepare)(struct bpf_prog *prog);
911 int (*translate)(struct bpf_prog *prog);
912 void (*destroy)(struct bpf_prog *prog);
915 struct bpf_prog_offload {
916 struct bpf_prog *prog;
917 struct net_device *netdev;
918 struct bpf_offload_dev *offdev;
920 struct list_head offloads;
927 enum bpf_cgroup_storage_type {
928 BPF_CGROUP_STORAGE_SHARED,
929 BPF_CGROUP_STORAGE_PERCPU,
930 __BPF_CGROUP_STORAGE_MAX
933 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
935 /* The longest tracepoint has 12 args.
936 * See include/trace/bpf_probe.h
938 #define MAX_BPF_FUNC_ARGS 12
940 /* The maximum number of arguments passed through registers
941 * a single function may have.
943 #define MAX_BPF_FUNC_REG_ARGS 5
945 /* The argument is a structure. */
946 #define BTF_FMODEL_STRUCT_ARG BIT(0)
948 /* The argument is signed. */
949 #define BTF_FMODEL_SIGNED_ARG BIT(1)
951 struct btf_func_model {
955 u8 arg_size[MAX_BPF_FUNC_ARGS];
956 u8 arg_flags[MAX_BPF_FUNC_ARGS];
959 /* Restore arguments before returning from trampoline to let original function
960 * continue executing. This flag is used for fentry progs when there are no
963 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
964 /* Call original function after fentry progs, but before fexit progs.
965 * Makes sense for fentry/fexit, normal calls and indirect calls.
967 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
968 /* Skip current frame and return to parent. Makes sense for fentry/fexit
969 * programs only. Should not be used with normal calls and indirect calls.
971 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
972 /* Store IP address of the caller on the trampoline stack,
973 * so it's available for trampoline's programs.
975 #define BPF_TRAMP_F_IP_ARG BIT(3)
976 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
977 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
979 /* Get original function from stack instead of from provided direct address.
980 * Makes sense for trampolines with fexit or fmod_ret programs.
982 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
984 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
985 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
987 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
989 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
993 #if defined(__s390x__)
994 BPF_MAX_TRAMP_LINKS = 27,
996 BPF_MAX_TRAMP_LINKS = 38,
1000 struct bpf_tramp_links {
1001 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1005 struct bpf_tramp_run_ctx;
1007 /* Different use cases for BPF trampoline:
1008 * 1. replace nop at the function entry (kprobe equivalent)
1009 * flags = BPF_TRAMP_F_RESTORE_REGS
1010 * fentry = a set of programs to run before returning from trampoline
1012 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1013 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1014 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1015 * fentry = a set of program to run before calling original function
1016 * fexit = a set of program to run after original function
1018 * 3. replace direct call instruction anywhere in the function body
1019 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1021 * fentry = a set of programs to run before returning from trampoline
1022 * With flags = BPF_TRAMP_F_CALL_ORIG
1023 * orig_call = original callback addr or direct function addr
1024 * fentry = a set of program to run before calling original function
1025 * fexit = a set of program to run after original function
1027 struct bpf_tramp_image;
1028 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
1029 const struct btf_func_model *m, u32 flags,
1030 struct bpf_tramp_links *tlinks,
1032 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1033 struct bpf_tramp_run_ctx *run_ctx);
1034 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1035 struct bpf_tramp_run_ctx *run_ctx);
1036 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1037 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1038 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1039 struct bpf_tramp_run_ctx *run_ctx);
1040 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1041 struct bpf_tramp_run_ctx *run_ctx);
1042 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1043 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1046 unsigned long start;
1048 char name[KSYM_NAME_LEN];
1049 struct list_head lnode;
1050 struct latch_tree_node tnode;
1054 enum bpf_tramp_prog_type {
1057 BPF_TRAMP_MODIFY_RETURN,
1059 BPF_TRAMP_REPLACE, /* more than MAX */
1062 struct bpf_tramp_image {
1064 struct bpf_ksym ksym;
1065 struct percpu_ref pcref;
1066 void *ip_after_call;
1069 struct rcu_head rcu;
1070 struct work_struct work;
1074 struct bpf_trampoline {
1075 /* hlist for trampoline_table */
1076 struct hlist_node hlist;
1077 struct ftrace_ops *fops;
1078 /* serializes access to fields of this trampoline */
1084 struct btf_func_model model;
1086 bool ftrace_managed;
1088 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1089 * program by replacing one of its functions. func.addr is the address
1090 * of the function it replaced.
1092 struct bpf_prog *extension_prog;
1093 /* list of BPF programs using this trampoline */
1094 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1095 /* Number of attached programs. A counter per kind. */
1096 int progs_cnt[BPF_TRAMP_MAX];
1097 /* Executable image of trampoline */
1098 struct bpf_tramp_image *cur_image;
1103 struct bpf_attach_target_info {
1104 struct btf_func_model fmodel;
1106 struct module *tgt_mod;
1107 const char *tgt_name;
1108 const struct btf_type *tgt_type;
1111 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1113 struct bpf_dispatcher_prog {
1114 struct bpf_prog *prog;
1118 struct bpf_dispatcher {
1119 /* dispatcher mutex */
1122 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1127 struct bpf_ksym ksym;
1128 #ifdef CONFIG_HAVE_STATIC_CALL
1129 struct static_call_key *sc_key;
1134 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
1136 const struct bpf_insn *insnsi,
1137 bpf_func_t bpf_func)
1139 return bpf_func(ctx, insnsi);
1142 /* the implementation of the opaque uapi struct bpf_dynptr */
1143 struct bpf_dynptr_kern {
1145 /* Size represents the number of usable bytes of dynptr data.
1146 * If for example the offset is at 4 for a local dynptr whose data is
1147 * of type u64, the number of usable bytes is 4.
1149 * The upper 8 bits are reserved. It is as follows:
1150 * Bits 0 - 23 = size
1151 * Bits 24 - 30 = dynptr type
1152 * Bit 31 = whether dynptr is read-only
1158 enum bpf_dynptr_type {
1159 BPF_DYNPTR_TYPE_INVALID,
1160 /* Points to memory that is local to the bpf program */
1161 BPF_DYNPTR_TYPE_LOCAL,
1162 /* Underlying data is a ringbuf record */
1163 BPF_DYNPTR_TYPE_RINGBUF,
1164 /* Underlying data is a sk_buff */
1165 BPF_DYNPTR_TYPE_SKB,
1166 /* Underlying data is a xdp_buff */
1167 BPF_DYNPTR_TYPE_XDP,
1170 int bpf_dynptr_check_size(u32 size);
1171 u32 bpf_dynptr_get_size(const struct bpf_dynptr_kern *ptr);
1173 #ifdef CONFIG_BPF_JIT
1174 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1175 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1176 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1177 struct bpf_attach_target_info *tgt_info);
1178 void bpf_trampoline_put(struct bpf_trampoline *tr);
1179 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1182 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1183 * indirection with a direct call to the bpf program. If the architecture does
1184 * not have STATIC_CALL, avoid a double-indirection.
1186 #ifdef CONFIG_HAVE_STATIC_CALL
1188 #define __BPF_DISPATCHER_SC_INIT(_name) \
1189 .sc_key = &STATIC_CALL_KEY(_name), \
1190 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1192 #define __BPF_DISPATCHER_SC(name) \
1193 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1195 #define __BPF_DISPATCHER_CALL(name) \
1196 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1198 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1199 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1202 #define __BPF_DISPATCHER_SC_INIT(name)
1203 #define __BPF_DISPATCHER_SC(name)
1204 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1205 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1208 #define BPF_DISPATCHER_INIT(_name) { \
1209 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1210 .func = &_name##_func, \
1217 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1219 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1222 #define DEFINE_BPF_DISPATCHER(name) \
1223 __BPF_DISPATCHER_SC(name); \
1224 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
1226 const struct bpf_insn *insnsi, \
1227 bpf_func_t bpf_func) \
1229 return __BPF_DISPATCHER_CALL(name); \
1231 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1232 struct bpf_dispatcher bpf_dispatcher_##name = \
1233 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1235 #define DECLARE_BPF_DISPATCHER(name) \
1236 unsigned int bpf_dispatcher_##name##_func( \
1238 const struct bpf_insn *insnsi, \
1239 bpf_func_t bpf_func); \
1240 extern struct bpf_dispatcher bpf_dispatcher_##name;
1242 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1243 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1244 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1245 struct bpf_prog *to);
1246 /* Called only from JIT-enabled code, so there's no need for stubs. */
1247 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
1248 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1249 void bpf_ksym_add(struct bpf_ksym *ksym);
1250 void bpf_ksym_del(struct bpf_ksym *ksym);
1251 int bpf_jit_charge_modmem(u32 size);
1252 void bpf_jit_uncharge_modmem(u32 size);
1253 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1255 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1256 struct bpf_trampoline *tr)
1260 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1261 struct bpf_trampoline *tr)
1265 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1266 struct bpf_attach_target_info *tgt_info)
1268 return ERR_PTR(-EOPNOTSUPP);
1270 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1271 #define DEFINE_BPF_DISPATCHER(name)
1272 #define DECLARE_BPF_DISPATCHER(name)
1273 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1274 #define BPF_DISPATCHER_PTR(name) NULL
1275 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1276 struct bpf_prog *from,
1277 struct bpf_prog *to) {}
1278 static inline bool is_bpf_image_address(unsigned long address)
1282 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1288 struct bpf_func_info_aux {
1293 enum bpf_jit_poke_reason {
1294 BPF_POKE_REASON_TAIL_CALL,
1297 /* Descriptor of pokes pointing /into/ the JITed image. */
1298 struct bpf_jit_poke_descriptor {
1299 void *tailcall_target;
1300 void *tailcall_bypass;
1305 struct bpf_map *map;
1309 bool tailcall_target_stable;
1315 /* reg_type info for ctx arguments */
1316 struct bpf_ctx_arg_aux {
1318 enum bpf_reg_type reg_type;
1322 struct btf_mod_pair {
1324 struct module *module;
1327 struct bpf_kfunc_desc_tab;
1329 struct bpf_prog_aux {
1338 u32 func_cnt; /* used by non-func prog as the number of func progs */
1339 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1340 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1341 u32 ctx_arg_info_size;
1342 u32 max_rdonly_access;
1343 u32 max_rdwr_access;
1344 struct btf *attach_btf;
1345 const struct bpf_ctx_arg_aux *ctx_arg_info;
1346 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1347 struct bpf_prog *dst_prog;
1348 struct bpf_trampoline *dst_trampoline;
1349 enum bpf_prog_type saved_dst_prog_type;
1350 enum bpf_attach_type saved_dst_attach_type;
1351 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1352 bool dev_bound; /* Program is bound to the netdev. */
1353 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1354 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1355 bool func_proto_unreliable;
1357 bool tail_call_reachable;
1359 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1360 const struct btf_type *attach_func_proto;
1361 /* function name for valid attach_btf_id */
1362 const char *attach_func_name;
1363 struct bpf_prog **func;
1364 void *jit_data; /* JIT specific data. arch dependent */
1365 struct bpf_jit_poke_descriptor *poke_tab;
1366 struct bpf_kfunc_desc_tab *kfunc_tab;
1367 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1369 struct bpf_ksym ksym;
1370 const struct bpf_prog_ops *ops;
1371 struct bpf_map **used_maps;
1372 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1373 struct btf_mod_pair *used_btfs;
1374 struct bpf_prog *prog;
1375 struct user_struct *user;
1376 u64 load_time; /* ns since boottime */
1378 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1379 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1380 char name[BPF_OBJ_NAME_LEN];
1381 #ifdef CONFIG_SECURITY
1384 struct bpf_prog_offload *offload;
1386 struct bpf_func_info *func_info;
1387 struct bpf_func_info_aux *func_info_aux;
1388 /* bpf_line_info loaded from userspace. linfo->insn_off
1389 * has the xlated insn offset.
1390 * Both the main and sub prog share the same linfo.
1391 * The subprog can access its first linfo by
1392 * using the linfo_idx.
1394 struct bpf_line_info *linfo;
1395 /* jited_linfo is the jited addr of the linfo. It has a
1396 * one to one mapping to linfo:
1397 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1398 * Both the main and sub prog share the same jited_linfo.
1399 * The subprog can access its first jited_linfo by
1400 * using the linfo_idx.
1405 /* subprog can use linfo_idx to access its first linfo and
1407 * main prog always has linfo_idx == 0
1412 struct exception_table_entry *extable;
1414 struct work_struct work;
1415 struct rcu_head rcu;
1420 u16 pages; /* Number of allocated pages */
1421 u16 jited:1, /* Is our filter JIT'ed? */
1422 jit_requested:1,/* archs need to JIT the prog */
1423 gpl_compatible:1, /* Is filter GPL compatible? */
1424 cb_access:1, /* Is control block accessed? */
1425 dst_needed:1, /* Do we need dst entry? */
1426 blinding_requested:1, /* needs constant blinding */
1427 blinded:1, /* Was blinded */
1428 is_func:1, /* program is a bpf function */
1429 kprobe_override:1, /* Do we override a kprobe? */
1430 has_callchain_buf:1, /* callchain buffer allocated? */
1431 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1432 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1433 call_get_func_ip:1, /* Do we call get_func_ip() */
1434 tstamp_type_access:1; /* Accessed __sk_buff->tstamp_type */
1435 enum bpf_prog_type type; /* Type of BPF program */
1436 enum bpf_attach_type expected_attach_type; /* For some prog types */
1437 u32 len; /* Number of filter blocks */
1438 u32 jited_len; /* Size of jited insns in bytes */
1439 u8 tag[BPF_TAG_SIZE];
1440 struct bpf_prog_stats __percpu *stats;
1441 int __percpu *active;
1442 unsigned int (*bpf_func)(const void *ctx,
1443 const struct bpf_insn *insn);
1444 struct bpf_prog_aux *aux; /* Auxiliary fields */
1445 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1446 /* Instructions for interpreter */
1448 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1449 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1453 struct bpf_array_aux {
1454 /* Programs with direct jumps into programs part of this array. */
1455 struct list_head poke_progs;
1456 struct bpf_map *map;
1457 struct mutex poke_mutex;
1458 struct work_struct work;
1464 enum bpf_link_type type;
1465 const struct bpf_link_ops *ops;
1466 struct bpf_prog *prog;
1467 struct work_struct work;
1470 struct bpf_link_ops {
1471 void (*release)(struct bpf_link *link);
1472 void (*dealloc)(struct bpf_link *link);
1473 int (*detach)(struct bpf_link *link);
1474 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1475 struct bpf_prog *old_prog);
1476 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1477 int (*fill_link_info)(const struct bpf_link *link,
1478 struct bpf_link_info *info);
1481 struct bpf_tramp_link {
1482 struct bpf_link link;
1483 struct hlist_node tramp_hlist;
1487 struct bpf_shim_tramp_link {
1488 struct bpf_tramp_link link;
1489 struct bpf_trampoline *trampoline;
1492 struct bpf_tracing_link {
1493 struct bpf_tramp_link link;
1494 enum bpf_attach_type attach_type;
1495 struct bpf_trampoline *trampoline;
1496 struct bpf_prog *tgt_prog;
1499 struct bpf_link_primer {
1500 struct bpf_link *link;
1506 struct bpf_struct_ops_value;
1509 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1510 struct bpf_struct_ops {
1511 const struct bpf_verifier_ops *verifier_ops;
1512 int (*init)(struct btf *btf);
1513 int (*check_member)(const struct btf_type *t,
1514 const struct btf_member *member,
1515 const struct bpf_prog *prog);
1516 int (*init_member)(const struct btf_type *t,
1517 const struct btf_member *member,
1518 void *kdata, const void *udata);
1519 int (*reg)(void *kdata);
1520 void (*unreg)(void *kdata);
1521 const struct btf_type *type;
1522 const struct btf_type *value_type;
1524 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1529 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1530 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1531 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1532 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1533 bool bpf_struct_ops_get(const void *kdata);
1534 void bpf_struct_ops_put(const void *kdata);
1535 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1537 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1538 struct bpf_tramp_link *link,
1539 const struct btf_func_model *model,
1540 void *image, void *image_end);
1541 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1543 if (owner == BPF_MODULE_OWNER)
1544 return bpf_struct_ops_get(data);
1546 return try_module_get(owner);
1548 static inline void bpf_module_put(const void *data, struct module *owner)
1550 if (owner == BPF_MODULE_OWNER)
1551 bpf_struct_ops_put(data);
1557 /* Define it here to avoid the use of forward declaration */
1558 struct bpf_dummy_ops_state {
1562 struct bpf_dummy_ops {
1563 int (*test_1)(struct bpf_dummy_ops_state *cb);
1564 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1565 char a3, unsigned long a4);
1566 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1569 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1570 union bpf_attr __user *uattr);
1573 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1577 static inline void bpf_struct_ops_init(struct btf *btf,
1578 struct bpf_verifier_log *log)
1581 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1583 return try_module_get(owner);
1585 static inline void bpf_module_put(const void *data, struct module *owner)
1589 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1597 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1598 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1600 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1602 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1607 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1616 struct bpf_array_aux *aux;
1618 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1619 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1620 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1624 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1625 #define MAX_TAIL_CALL_CNT 33
1627 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1628 * It's enum to expose it (and thus make it discoverable) through BTF.
1631 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1634 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1635 BPF_F_RDONLY_PROG | \
1639 #define BPF_MAP_CAN_READ BIT(0)
1640 #define BPF_MAP_CAN_WRITE BIT(1)
1642 /* Maximum number of user-producer ring buffer samples that can be drained in
1643 * a call to bpf_user_ringbuf_drain().
1645 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1647 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1649 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1651 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1654 if (access_flags & BPF_F_RDONLY_PROG)
1655 return BPF_MAP_CAN_READ;
1656 else if (access_flags & BPF_F_WRONLY_PROG)
1657 return BPF_MAP_CAN_WRITE;
1659 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1662 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1664 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1665 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1668 struct bpf_event_entry {
1669 struct perf_event *event;
1670 struct file *perf_file;
1671 struct file *map_file;
1672 struct rcu_head rcu;
1675 static inline bool map_type_contains_progs(struct bpf_map *map)
1677 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1678 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1679 map->map_type == BPF_MAP_TYPE_CPUMAP;
1682 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1683 int bpf_prog_calc_tag(struct bpf_prog *fp);
1685 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1686 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1688 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1689 unsigned long off, unsigned long len);
1690 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1691 const struct bpf_insn *src,
1692 struct bpf_insn *dst,
1693 struct bpf_prog *prog,
1696 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1697 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1699 /* an array of programs to be executed under rcu_lock.
1702 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
1704 * the structure returned by bpf_prog_array_alloc() should be populated
1705 * with program pointers and the last pointer must be NULL.
1706 * The user has to keep refcnt on the program and make sure the program
1707 * is removed from the array before bpf_prog_put().
1708 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1709 * since other cpus are walking the array of pointers in parallel.
1711 struct bpf_prog_array_item {
1712 struct bpf_prog *prog;
1714 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1719 struct bpf_prog_array {
1720 struct rcu_head rcu;
1721 struct bpf_prog_array_item items[];
1724 struct bpf_empty_prog_array {
1725 struct bpf_prog_array hdr;
1726 struct bpf_prog *null_prog;
1729 /* to avoid allocating empty bpf_prog_array for cgroups that
1730 * don't have bpf program attached use one global 'bpf_empty_prog_array'
1731 * It will not be modified the caller of bpf_prog_array_alloc()
1732 * (since caller requested prog_cnt == 0)
1733 * that pointer should be 'freed' by bpf_prog_array_free()
1735 extern struct bpf_empty_prog_array bpf_empty_prog_array;
1737 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1738 void bpf_prog_array_free(struct bpf_prog_array *progs);
1739 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
1740 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
1741 int bpf_prog_array_length(struct bpf_prog_array *progs);
1742 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1743 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1744 __u32 __user *prog_ids, u32 cnt);
1746 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1747 struct bpf_prog *old_prog);
1748 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1749 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1750 struct bpf_prog *prog);
1751 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1752 u32 *prog_ids, u32 request_cnt,
1754 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1755 struct bpf_prog *exclude_prog,
1756 struct bpf_prog *include_prog,
1758 struct bpf_prog_array **new_array);
1760 struct bpf_run_ctx {};
1762 struct bpf_cg_run_ctx {
1763 struct bpf_run_ctx run_ctx;
1764 const struct bpf_prog_array_item *prog_item;
1768 struct bpf_trace_run_ctx {
1769 struct bpf_run_ctx run_ctx;
1773 struct bpf_tramp_run_ctx {
1774 struct bpf_run_ctx run_ctx;
1776 struct bpf_run_ctx *saved_run_ctx;
1779 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1781 struct bpf_run_ctx *old_ctx = NULL;
1783 #ifdef CONFIG_BPF_SYSCALL
1784 old_ctx = current->bpf_ctx;
1785 current->bpf_ctx = new_ctx;
1790 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1792 #ifdef CONFIG_BPF_SYSCALL
1793 current->bpf_ctx = old_ctx;
1797 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1798 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1799 /* BPF program asks to set CN on the packet. */
1800 #define BPF_RET_SET_CN (1 << 0)
1802 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1804 static __always_inline u32
1805 bpf_prog_run_array(const struct bpf_prog_array *array,
1806 const void *ctx, bpf_prog_run_fn run_prog)
1808 const struct bpf_prog_array_item *item;
1809 const struct bpf_prog *prog;
1810 struct bpf_run_ctx *old_run_ctx;
1811 struct bpf_trace_run_ctx run_ctx;
1814 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
1816 if (unlikely(!array))
1820 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1821 item = &array->items[0];
1822 while ((prog = READ_ONCE(item->prog))) {
1823 run_ctx.bpf_cookie = item->bpf_cookie;
1824 ret &= run_prog(prog, ctx);
1827 bpf_reset_run_ctx(old_run_ctx);
1832 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
1834 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
1835 * overall. As a result, we must use the bpf_prog_array_free_sleepable
1836 * in order to use the tasks_trace rcu grace period.
1838 * When a non-sleepable program is inside the array, we take the rcu read
1839 * section and disable preemption for that program alone, so it can access
1840 * rcu-protected dynamically sized maps.
1842 static __always_inline u32
1843 bpf_prog_run_array_sleepable(const struct bpf_prog_array __rcu *array_rcu,
1844 const void *ctx, bpf_prog_run_fn run_prog)
1846 const struct bpf_prog_array_item *item;
1847 const struct bpf_prog *prog;
1848 const struct bpf_prog_array *array;
1849 struct bpf_run_ctx *old_run_ctx;
1850 struct bpf_trace_run_ctx run_ctx;
1855 rcu_read_lock_trace();
1858 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());
1859 if (unlikely(!array))
1861 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1862 item = &array->items[0];
1863 while ((prog = READ_ONCE(item->prog))) {
1864 if (!prog->aux->sleepable)
1867 run_ctx.bpf_cookie = item->bpf_cookie;
1868 ret &= run_prog(prog, ctx);
1871 if (!prog->aux->sleepable)
1874 bpf_reset_run_ctx(old_run_ctx);
1877 rcu_read_unlock_trace();
1881 #ifdef CONFIG_BPF_SYSCALL
1882 DECLARE_PER_CPU(int, bpf_prog_active);
1883 extern struct mutex bpf_stats_enabled_mutex;
1886 * Block execution of BPF programs attached to instrumentation (perf,
1887 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1888 * these events can happen inside a region which holds a map bucket lock
1889 * and can deadlock on it.
1891 static inline void bpf_disable_instrumentation(void)
1894 this_cpu_inc(bpf_prog_active);
1897 static inline void bpf_enable_instrumentation(void)
1899 this_cpu_dec(bpf_prog_active);
1903 extern const struct file_operations bpf_map_fops;
1904 extern const struct file_operations bpf_prog_fops;
1905 extern const struct file_operations bpf_iter_fops;
1907 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1908 extern const struct bpf_prog_ops _name ## _prog_ops; \
1909 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1910 #define BPF_MAP_TYPE(_id, _ops) \
1911 extern const struct bpf_map_ops _ops;
1912 #define BPF_LINK_TYPE(_id, _name)
1913 #include <linux/bpf_types.h>
1914 #undef BPF_PROG_TYPE
1916 #undef BPF_LINK_TYPE
1918 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1919 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1920 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1922 struct bpf_prog *bpf_prog_get(u32 ufd);
1923 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1925 void bpf_prog_add(struct bpf_prog *prog, int i);
1926 void bpf_prog_sub(struct bpf_prog *prog, int i);
1927 void bpf_prog_inc(struct bpf_prog *prog);
1928 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1929 void bpf_prog_put(struct bpf_prog *prog);
1931 void bpf_prog_free_id(struct bpf_prog *prog);
1932 void bpf_map_free_id(struct bpf_map *map);
1934 struct btf_field *btf_record_find(const struct btf_record *rec,
1935 u32 offset, u32 field_mask);
1936 void btf_record_free(struct btf_record *rec);
1937 void bpf_map_free_record(struct bpf_map *map);
1938 struct btf_record *btf_record_dup(const struct btf_record *rec);
1939 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
1940 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
1941 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
1943 struct bpf_map *bpf_map_get(u32 ufd);
1944 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1945 struct bpf_map *__bpf_map_get(struct fd f);
1946 void bpf_map_inc(struct bpf_map *map);
1947 void bpf_map_inc_with_uref(struct bpf_map *map);
1948 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1949 void bpf_map_put_with_uref(struct bpf_map *map);
1950 void bpf_map_put(struct bpf_map *map);
1951 void *bpf_map_area_alloc(u64 size, int numa_node);
1952 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1953 void bpf_map_area_free(void *base);
1954 bool bpf_map_write_active(const struct bpf_map *map);
1955 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1956 int generic_map_lookup_batch(struct bpf_map *map,
1957 const union bpf_attr *attr,
1958 union bpf_attr __user *uattr);
1959 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
1960 const union bpf_attr *attr,
1961 union bpf_attr __user *uattr);
1962 int generic_map_delete_batch(struct bpf_map *map,
1963 const union bpf_attr *attr,
1964 union bpf_attr __user *uattr);
1965 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1966 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1968 #ifdef CONFIG_MEMCG_KMEM
1969 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1971 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1972 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
1974 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1975 size_t align, gfp_t flags);
1977 static inline void *
1978 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1981 return kmalloc_node(size, flags, node);
1984 static inline void *
1985 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1987 return kzalloc(size, flags);
1990 static inline void *
1991 bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
1993 return kvcalloc(n, size, flags);
1996 static inline void __percpu *
1997 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
2000 return __alloc_percpu_gfp(size, align, flags);
2004 extern int sysctl_unprivileged_bpf_disabled;
2006 static inline bool bpf_allow_ptr_leaks(void)
2008 return perfmon_capable();
2011 static inline bool bpf_allow_uninit_stack(void)
2013 return perfmon_capable();
2016 static inline bool bpf_bypass_spec_v1(void)
2018 return perfmon_capable();
2021 static inline bool bpf_bypass_spec_v4(void)
2023 return perfmon_capable();
2026 int bpf_map_new_fd(struct bpf_map *map, int flags);
2027 int bpf_prog_new_fd(struct bpf_prog *prog);
2029 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2030 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2031 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2032 int bpf_link_settle(struct bpf_link_primer *primer);
2033 void bpf_link_cleanup(struct bpf_link_primer *primer);
2034 void bpf_link_inc(struct bpf_link *link);
2035 void bpf_link_put(struct bpf_link *link);
2036 int bpf_link_new_fd(struct bpf_link *link);
2037 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
2038 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2039 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2041 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
2042 int bpf_obj_get_user(const char __user *pathname, int flags);
2044 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2045 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2046 extern int bpf_iter_ ## target(args); \
2047 int __init bpf_iter_ ## target(args) { return 0; }
2050 * The task type of iterators.
2052 * For BPF task iterators, they can be parameterized with various
2053 * parameters to visit only some of tasks.
2055 * BPF_TASK_ITER_ALL (default)
2056 * Iterate over resources of every task.
2059 * Iterate over resources of a task/tid.
2061 * BPF_TASK_ITER_TGID
2062 * Iterate over resources of every task of a process / task group.
2064 enum bpf_iter_task_type {
2065 BPF_TASK_ITER_ALL = 0,
2070 struct bpf_iter_aux_info {
2071 /* for map_elem iter */
2072 struct bpf_map *map;
2074 /* for cgroup iter */
2076 struct cgroup *start; /* starting cgroup */
2077 enum bpf_cgroup_iter_order order;
2080 enum bpf_iter_task_type type;
2085 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2086 union bpf_iter_link_info *linfo,
2087 struct bpf_iter_aux_info *aux);
2088 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2089 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2090 struct seq_file *seq);
2091 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2092 struct bpf_link_info *info);
2093 typedef const struct bpf_func_proto *
2094 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2095 const struct bpf_prog *prog);
2097 enum bpf_iter_feature {
2098 BPF_ITER_RESCHED = BIT(0),
2101 #define BPF_ITER_CTX_ARG_MAX 2
2102 struct bpf_iter_reg {
2104 bpf_iter_attach_target_t attach_target;
2105 bpf_iter_detach_target_t detach_target;
2106 bpf_iter_show_fdinfo_t show_fdinfo;
2107 bpf_iter_fill_link_info_t fill_link_info;
2108 bpf_iter_get_func_proto_t get_func_proto;
2109 u32 ctx_arg_info_size;
2111 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2112 const struct bpf_iter_seq_info *seq_info;
2115 struct bpf_iter_meta {
2116 __bpf_md_ptr(struct seq_file *, seq);
2121 struct bpf_iter__bpf_map_elem {
2122 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2123 __bpf_md_ptr(struct bpf_map *, map);
2124 __bpf_md_ptr(void *, key);
2125 __bpf_md_ptr(void *, value);
2128 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2129 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2130 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2131 const struct bpf_func_proto *
2132 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2133 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2134 int bpf_iter_new_fd(struct bpf_link *link);
2135 bool bpf_link_is_iter(struct bpf_link *link);
2136 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2137 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2138 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2139 struct seq_file *seq);
2140 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2141 struct bpf_link_info *info);
2143 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2144 struct bpf_func_state *caller,
2145 struct bpf_func_state *callee);
2147 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2148 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2149 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2151 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2154 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2156 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2157 void *key, void *value, u64 map_flags);
2158 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2159 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2160 void *key, void *value, u64 map_flags);
2161 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2163 int bpf_get_file_flag(int flags);
2164 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2165 size_t actual_size);
2167 /* verify correctness of eBPF program */
2168 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
2170 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2171 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2174 struct btf *bpf_get_btf_vmlinux(void);
2179 struct bpf_dtab_netdev;
2180 struct bpf_cpu_map_entry;
2182 void __dev_flush(void);
2183 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2184 struct net_device *dev_rx);
2185 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2186 struct net_device *dev_rx);
2187 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2188 struct bpf_map *map, bool exclude_ingress);
2189 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2190 struct bpf_prog *xdp_prog);
2191 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2192 struct bpf_prog *xdp_prog, struct bpf_map *map,
2193 bool exclude_ingress);
2195 void __cpu_map_flush(void);
2196 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2197 struct net_device *dev_rx);
2198 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2199 struct sk_buff *skb);
2201 /* Return map's numa specified by userspace */
2202 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2204 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2205 attr->numa_node : NUMA_NO_NODE;
2208 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2209 int array_map_alloc_check(union bpf_attr *attr);
2211 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2212 union bpf_attr __user *uattr);
2213 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2214 union bpf_attr __user *uattr);
2215 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2216 const union bpf_attr *kattr,
2217 union bpf_attr __user *uattr);
2218 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2219 const union bpf_attr *kattr,
2220 union bpf_attr __user *uattr);
2221 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2222 const union bpf_attr *kattr,
2223 union bpf_attr __user *uattr);
2224 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2225 const union bpf_attr *kattr,
2226 union bpf_attr __user *uattr);
2227 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2228 const struct bpf_prog *prog,
2229 struct bpf_insn_access_aux *info);
2231 static inline bool bpf_tracing_ctx_access(int off, int size,
2232 enum bpf_access_type type)
2234 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2236 if (type != BPF_READ)
2238 if (off % size != 0)
2243 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2244 enum bpf_access_type type,
2245 const struct bpf_prog *prog,
2246 struct bpf_insn_access_aux *info)
2248 if (!bpf_tracing_ctx_access(off, size, type))
2250 return btf_ctx_access(off, size, type, prog, info);
2253 int btf_struct_access(struct bpf_verifier_log *log,
2254 const struct bpf_reg_state *reg,
2255 int off, int size, enum bpf_access_type atype,
2256 u32 *next_btf_id, enum bpf_type_flag *flag);
2257 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2258 const struct btf *btf, u32 id, int off,
2259 const struct btf *need_btf, u32 need_type_id,
2262 int btf_distill_func_proto(struct bpf_verifier_log *log,
2264 const struct btf_type *func_proto,
2265 const char *func_name,
2266 struct btf_func_model *m);
2268 struct bpf_reg_state;
2269 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
2270 struct bpf_reg_state *regs);
2271 int btf_check_subprog_call(struct bpf_verifier_env *env, int subprog,
2272 struct bpf_reg_state *regs);
2273 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
2274 struct bpf_reg_state *reg);
2275 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2276 struct btf *btf, const struct btf_type *t);
2278 struct bpf_prog *bpf_prog_by_id(u32 id);
2279 struct bpf_link *bpf_link_by_id(u32 id);
2281 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
2282 void bpf_task_storage_free(struct task_struct *task);
2283 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2284 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2285 const struct btf_func_model *
2286 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2287 const struct bpf_insn *insn);
2288 struct bpf_core_ctx {
2289 struct bpf_verifier_log *log;
2290 const struct btf *btf;
2293 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2294 const struct bpf_reg_state *reg,
2295 int off, const char *suffix);
2297 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2298 const struct btf *reg_btf, u32 reg_id,
2299 const struct btf *arg_btf, u32 arg_id);
2301 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2302 int relo_idx, void *insn);
2304 static inline bool unprivileged_ebpf_enabled(void)
2306 return !sysctl_unprivileged_bpf_disabled;
2309 /* Not all bpf prog type has the bpf_ctx.
2310 * For the bpf prog type that has initialized the bpf_ctx,
2311 * this function can be used to decide if a kernel function
2312 * is called by a bpf program.
2314 static inline bool has_current_bpf_ctx(void)
2316 return !!current->bpf_ctx;
2319 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2321 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2322 enum bpf_dynptr_type type, u32 offset, u32 size);
2323 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2324 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2325 #else /* !CONFIG_BPF_SYSCALL */
2326 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2328 return ERR_PTR(-EOPNOTSUPP);
2331 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2332 enum bpf_prog_type type,
2335 return ERR_PTR(-EOPNOTSUPP);
2338 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2342 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2346 static inline void bpf_prog_put(struct bpf_prog *prog)
2350 static inline void bpf_prog_inc(struct bpf_prog *prog)
2354 static inline struct bpf_prog *__must_check
2355 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2357 return ERR_PTR(-EOPNOTSUPP);
2360 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2361 const struct bpf_link_ops *ops,
2362 struct bpf_prog *prog)
2366 static inline int bpf_link_prime(struct bpf_link *link,
2367 struct bpf_link_primer *primer)
2372 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2377 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2381 static inline void bpf_link_inc(struct bpf_link *link)
2385 static inline void bpf_link_put(struct bpf_link *link)
2389 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2394 static inline void __dev_flush(void)
2399 struct bpf_dtab_netdev;
2400 struct bpf_cpu_map_entry;
2403 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2404 struct net_device *dev_rx)
2410 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2411 struct net_device *dev_rx)
2417 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2418 struct bpf_map *map, bool exclude_ingress)
2425 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2426 struct sk_buff *skb,
2427 struct bpf_prog *xdp_prog)
2433 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2434 struct bpf_prog *xdp_prog, struct bpf_map *map,
2435 bool exclude_ingress)
2440 static inline void __cpu_map_flush(void)
2444 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2445 struct xdp_frame *xdpf,
2446 struct net_device *dev_rx)
2451 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2452 struct sk_buff *skb)
2457 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2458 enum bpf_prog_type type)
2460 return ERR_PTR(-EOPNOTSUPP);
2463 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2464 const union bpf_attr *kattr,
2465 union bpf_attr __user *uattr)
2470 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2471 const union bpf_attr *kattr,
2472 union bpf_attr __user *uattr)
2477 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2478 const union bpf_attr *kattr,
2479 union bpf_attr __user *uattr)
2484 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2485 const union bpf_attr *kattr,
2486 union bpf_attr __user *uattr)
2491 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2492 const union bpf_attr *kattr,
2493 union bpf_attr __user *uattr)
2498 static inline void bpf_map_put(struct bpf_map *map)
2502 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2504 return ERR_PTR(-ENOTSUPP);
2507 static inline int btf_struct_access(struct bpf_verifier_log *log,
2508 const struct bpf_reg_state *reg,
2509 int off, int size, enum bpf_access_type atype,
2510 u32 *next_btf_id, enum bpf_type_flag *flag)
2515 static inline const struct bpf_func_proto *
2516 bpf_base_func_proto(enum bpf_func_id func_id)
2521 static inline void bpf_task_storage_free(struct task_struct *task)
2525 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2530 static inline const struct btf_func_model *
2531 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2532 const struct bpf_insn *insn)
2537 static inline bool unprivileged_ebpf_enabled(void)
2542 static inline bool has_current_bpf_ctx(void)
2547 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2551 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
2555 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2556 enum bpf_dynptr_type type, u32 offset, u32 size)
2560 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
2564 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
2567 #endif /* CONFIG_BPF_SYSCALL */
2569 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2570 struct btf_mod_pair *used_btfs, u32 len);
2572 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2573 enum bpf_prog_type type)
2575 return bpf_prog_get_type_dev(ufd, type, false);
2578 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2579 struct bpf_map **used_maps, u32 len);
2581 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2583 int bpf_prog_offload_compile(struct bpf_prog *prog);
2584 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
2585 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2586 struct bpf_prog *prog);
2588 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2590 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2591 int bpf_map_offload_update_elem(struct bpf_map *map,
2592 void *key, void *value, u64 flags);
2593 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2594 int bpf_map_offload_get_next_key(struct bpf_map *map,
2595 void *key, void *next_key);
2597 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2599 struct bpf_offload_dev *
2600 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2601 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2602 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2603 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2604 struct net_device *netdev);
2605 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2606 struct net_device *netdev);
2607 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2609 void unpriv_ebpf_notify(int new_state);
2611 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2612 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2613 struct bpf_prog_aux *prog_aux);
2614 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
2615 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
2616 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
2617 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
2619 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2621 return aux->dev_bound;
2624 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
2626 return aux->offload_requested;
2629 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
2631 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2633 return unlikely(map->ops == &bpf_map_offload_ops);
2636 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2637 void bpf_map_offload_map_free(struct bpf_map *map);
2638 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
2639 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2640 const union bpf_attr *kattr,
2641 union bpf_attr __user *uattr);
2643 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2644 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2645 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2646 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2647 union bpf_attr __user *uattr);
2649 void sock_map_unhash(struct sock *sk);
2650 void sock_map_destroy(struct sock *sk);
2651 void sock_map_close(struct sock *sk, long timeout);
2653 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2654 struct bpf_prog_aux *prog_aux)
2659 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
2665 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
2666 union bpf_attr *attr)
2671 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
2672 struct bpf_prog *old_prog)
2677 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
2681 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2686 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
2691 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
2696 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2701 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2703 return ERR_PTR(-EOPNOTSUPP);
2706 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2710 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
2715 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2716 const union bpf_attr *kattr,
2717 union bpf_attr __user *uattr)
2722 #ifdef CONFIG_BPF_SYSCALL
2723 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2724 struct bpf_prog *prog)
2729 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2730 enum bpf_prog_type ptype)
2735 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2741 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2742 union bpf_attr __user *uattr)
2746 #endif /* CONFIG_BPF_SYSCALL */
2747 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2749 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2750 void bpf_sk_reuseport_detach(struct sock *sk);
2751 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2753 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2754 void *value, u64 map_flags);
2756 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2760 #ifdef CONFIG_BPF_SYSCALL
2761 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2762 void *key, void *value)
2767 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2768 void *key, void *value,
2773 #endif /* CONFIG_BPF_SYSCALL */
2774 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2776 /* verifier prototypes for helper functions called from eBPF programs */
2777 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2778 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2779 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2780 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2781 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2782 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2783 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
2785 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2786 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2787 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2788 extern const struct bpf_func_proto bpf_tail_call_proto;
2789 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2790 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2791 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
2792 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2793 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2794 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2795 extern const struct bpf_func_proto bpf_get_stackid_proto;
2796 extern const struct bpf_func_proto bpf_get_stack_proto;
2797 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2798 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2799 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2800 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2801 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2802 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2803 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2804 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
2805 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2806 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2807 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2808 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2809 extern const struct bpf_func_proto bpf_spin_lock_proto;
2810 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2811 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2812 extern const struct bpf_func_proto bpf_strtol_proto;
2813 extern const struct bpf_func_proto bpf_strtoul_proto;
2814 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2815 extern const struct bpf_func_proto bpf_jiffies64_proto;
2816 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2817 extern const struct bpf_func_proto bpf_event_output_data_proto;
2818 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2819 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2820 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2821 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2822 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2823 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
2824 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
2825 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
2826 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2827 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2828 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2829 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2830 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2831 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
2832 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
2833 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2834 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2835 extern const struct bpf_func_proto bpf_snprintf_proto;
2836 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2837 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2838 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2839 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2840 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2841 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
2842 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2843 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
2844 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2845 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2846 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2847 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2848 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2849 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
2850 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
2851 extern const struct bpf_func_proto bpf_find_vma_proto;
2852 extern const struct bpf_func_proto bpf_loop_proto;
2853 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
2854 extern const struct bpf_func_proto bpf_set_retval_proto;
2855 extern const struct bpf_func_proto bpf_get_retval_proto;
2856 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
2857 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
2858 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
2860 const struct bpf_func_proto *tracing_prog_func_proto(
2861 enum bpf_func_id func_id, const struct bpf_prog *prog);
2863 /* Shared helpers among cBPF and eBPF. */
2864 void bpf_user_rnd_init_once(void);
2865 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2866 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2868 #if defined(CONFIG_NET)
2869 bool bpf_sock_common_is_valid_access(int off, int size,
2870 enum bpf_access_type type,
2871 struct bpf_insn_access_aux *info);
2872 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2873 struct bpf_insn_access_aux *info);
2874 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2875 const struct bpf_insn *si,
2876 struct bpf_insn *insn_buf,
2877 struct bpf_prog *prog,
2879 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
2880 struct bpf_dynptr_kern *ptr);
2882 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2883 enum bpf_access_type type,
2884 struct bpf_insn_access_aux *info)
2888 static inline bool bpf_sock_is_valid_access(int off, int size,
2889 enum bpf_access_type type,
2890 struct bpf_insn_access_aux *info)
2894 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2895 const struct bpf_insn *si,
2896 struct bpf_insn *insn_buf,
2897 struct bpf_prog *prog,
2902 static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
2903 struct bpf_dynptr_kern *ptr)
2910 struct sk_reuseport_kern {
2911 struct sk_buff *skb;
2913 struct sock *selected_sk;
2914 struct sock *migrating_sk;
2920 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2921 struct bpf_insn_access_aux *info);
2923 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2924 const struct bpf_insn *si,
2925 struct bpf_insn *insn_buf,
2926 struct bpf_prog *prog,
2929 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2930 struct bpf_insn_access_aux *info);
2932 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2933 const struct bpf_insn *si,
2934 struct bpf_insn *insn_buf,
2935 struct bpf_prog *prog,
2938 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2939 enum bpf_access_type type,
2940 struct bpf_insn_access_aux *info)
2945 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2946 const struct bpf_insn *si,
2947 struct bpf_insn *insn_buf,
2948 struct bpf_prog *prog,
2953 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2954 enum bpf_access_type type,
2955 struct bpf_insn_access_aux *info)
2960 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2961 const struct bpf_insn *si,
2962 struct bpf_insn *insn_buf,
2963 struct bpf_prog *prog,
2968 #endif /* CONFIG_INET */
2970 enum bpf_text_poke_type {
2975 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2976 void *addr1, void *addr2);
2978 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
2979 int bpf_arch_text_invalidate(void *dst, size_t len);
2982 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2984 #define MAX_BPRINTF_VARARGS 12
2985 #define MAX_BPRINTF_BUF 1024
2987 struct bpf_bprintf_data {
2994 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2995 u32 num_args, struct bpf_bprintf_data *data);
2996 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
2998 #ifdef CONFIG_BPF_LSM
2999 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3000 void bpf_cgroup_atype_put(int cgroup_atype);
3002 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
3003 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3004 #endif /* CONFIG_BPF_LSM */
3013 #endif /* CONFIG_KEYS */
3015 static inline bool type_is_alloc(u32 type)
3017 return type & MEM_ALLOC;
3020 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3022 if (memcg_bpf_enabled())
3023 return flags | __GFP_ACCOUNT;
3027 #endif /* _LINUX_BPF_H */