1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
7 #include <uapi/linux/bpf.h>
9 #include <linux/workqueue.h>
10 #include <linux/file.h>
11 #include <linux/percpu.h>
12 #include <linux/err.h>
13 #include <linux/rbtree_latch.h>
14 #include <linux/numa.h>
15 #include <linux/mm_types.h>
16 #include <linux/wait.h>
17 #include <linux/refcount.h>
18 #include <linux/mutex.h>
19 #include <linux/module.h>
20 #include <linux/kallsyms.h>
21 #include <linux/capability.h>
22 #include <linux/sched/mm.h>
23 #include <linux/slab.h>
24 #include <linux/percpu-refcount.h>
25 #include <linux/bpfptr.h>
27 struct bpf_verifier_env;
28 struct bpf_verifier_log;
37 struct exception_table_entry;
38 struct seq_operations;
39 struct bpf_iter_aux_info;
40 struct bpf_local_storage;
41 struct bpf_local_storage_map;
45 struct bpf_func_state;
47 extern struct idr btf_idr;
48 extern spinlock_t btf_idr_lock;
49 extern struct kobject *btf_kobj;
51 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
52 struct bpf_iter_aux_info *aux);
53 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
54 struct bpf_iter_seq_info {
55 const struct seq_operations *seq_ops;
56 bpf_iter_init_seq_priv_t init_seq_private;
57 bpf_iter_fini_seq_priv_t fini_seq_private;
61 /* map is generic key/value storage optionally accessible by eBPF programs */
63 /* funcs callable from userspace (via syscall) */
64 int (*map_alloc_check)(union bpf_attr *attr);
65 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
66 void (*map_release)(struct bpf_map *map, struct file *map_file);
67 void (*map_free)(struct bpf_map *map);
68 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
69 void (*map_release_uref)(struct bpf_map *map);
70 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
71 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
72 union bpf_attr __user *uattr);
73 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
74 void *value, u64 flags);
75 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
76 const union bpf_attr *attr,
77 union bpf_attr __user *uattr);
78 int (*map_update_batch)(struct bpf_map *map, const union bpf_attr *attr,
79 union bpf_attr __user *uattr);
80 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
81 union bpf_attr __user *uattr);
83 /* funcs callable from userspace and from eBPF programs */
84 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
85 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
86 int (*map_delete_elem)(struct bpf_map *map, void *key);
87 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
88 int (*map_pop_elem)(struct bpf_map *map, void *value);
89 int (*map_peek_elem)(struct bpf_map *map, void *value);
91 /* funcs called by prog_array and perf_event_array map */
92 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
94 void (*map_fd_put_ptr)(void *ptr);
95 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
96 u32 (*map_fd_sys_lookup_elem)(void *ptr);
97 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
99 int (*map_check_btf)(const struct bpf_map *map,
100 const struct btf *btf,
101 const struct btf_type *key_type,
102 const struct btf_type *value_type);
104 /* Prog poke tracking helpers. */
105 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
106 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
107 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
108 struct bpf_prog *new);
110 /* Direct value access helpers. */
111 int (*map_direct_value_addr)(const struct bpf_map *map,
113 int (*map_direct_value_meta)(const struct bpf_map *map,
115 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
116 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
117 struct poll_table_struct *pts);
119 /* Functions called by bpf_local_storage maps */
120 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
121 void *owner, u32 size);
122 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
123 void *owner, u32 size);
124 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
127 int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags);
129 /* map_meta_equal must be implemented for maps that can be
130 * used as an inner map. It is a runtime check to ensure
131 * an inner map can be inserted to an outer map.
133 * Some properties of the inner map has been used during the
134 * verification time. When inserting an inner map at the runtime,
135 * map_meta_equal has to ensure the inserting map has the same
136 * properties that the verifier has used earlier.
138 bool (*map_meta_equal)(const struct bpf_map *meta0,
139 const struct bpf_map *meta1);
142 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
143 struct bpf_func_state *caller,
144 struct bpf_func_state *callee);
145 int (*map_for_each_callback)(struct bpf_map *map, void *callback_fn,
146 void *callback_ctx, u64 flags);
148 /* BTF name and id of struct allocated by map_alloc */
149 const char * const map_btf_name;
152 /* bpf_iter info used to open a seq_file */
153 const struct bpf_iter_seq_info *iter_seq_info;
157 /* The first two cachelines with read-mostly members of which some
158 * are also accessed in fast-path (e.g. ops, max_entries).
160 const struct bpf_map_ops *ops ____cacheline_aligned;
161 struct bpf_map *inner_map_meta;
162 #ifdef CONFIG_SECURITY
165 enum bpf_map_type map_type;
170 int spin_lock_off; /* >=0 valid offset, <0 error */
171 int timer_off; /* >=0 valid offset, <0 error */
175 u32 btf_value_type_id;
177 #ifdef CONFIG_MEMCG_KMEM
178 struct mem_cgroup *memcg;
180 char name[BPF_OBJ_NAME_LEN];
181 u32 btf_vmlinux_value_type_id;
183 bool frozen; /* write-once; write-protected by freeze_mutex */
186 /* The 3rd and 4th cacheline with misc members to avoid false sharing
187 * particularly with refcounting.
189 atomic64_t refcnt ____cacheline_aligned;
191 struct work_struct work;
192 struct mutex freeze_mutex;
196 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
198 return map->spin_lock_off >= 0;
201 static inline bool map_value_has_timer(const struct bpf_map *map)
203 return map->timer_off >= 0;
206 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
208 if (unlikely(map_value_has_spin_lock(map)))
209 memset(dst + map->spin_lock_off, 0, sizeof(struct bpf_spin_lock));
210 if (unlikely(map_value_has_timer(map)))
211 memset(dst + map->timer_off, 0, sizeof(struct bpf_timer));
214 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */
215 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
217 u32 s_off = 0, s_sz = 0, t_off = 0, t_sz = 0;
219 if (unlikely(map_value_has_spin_lock(map))) {
220 s_off = map->spin_lock_off;
221 s_sz = sizeof(struct bpf_spin_lock);
223 if (unlikely(map_value_has_timer(map))) {
224 t_off = map->timer_off;
225 t_sz = sizeof(struct bpf_timer);
228 if (unlikely(s_sz || t_sz)) {
229 if (s_off < t_off || !s_sz) {
233 memcpy(dst, src, t_off);
234 memcpy(dst + t_off + t_sz,
236 s_off - t_off - t_sz);
237 memcpy(dst + s_off + s_sz,
239 map->value_size - s_off - s_sz);
241 memcpy(dst, src, map->value_size);
244 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
246 void bpf_timer_cancel_and_free(void *timer);
247 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
249 struct bpf_offload_dev;
250 struct bpf_offloaded_map;
252 struct bpf_map_dev_ops {
253 int (*map_get_next_key)(struct bpf_offloaded_map *map,
254 void *key, void *next_key);
255 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
256 void *key, void *value);
257 int (*map_update_elem)(struct bpf_offloaded_map *map,
258 void *key, void *value, u64 flags);
259 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
262 struct bpf_offloaded_map {
264 struct net_device *netdev;
265 const struct bpf_map_dev_ops *dev_ops;
267 struct list_head offloads;
270 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
272 return container_of(map, struct bpf_offloaded_map, map);
275 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
277 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
280 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
282 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
283 map->ops->map_seq_show_elem;
286 int map_check_no_btf(const struct bpf_map *map,
287 const struct btf *btf,
288 const struct btf_type *key_type,
289 const struct btf_type *value_type);
291 bool bpf_map_meta_equal(const struct bpf_map *meta0,
292 const struct bpf_map *meta1);
294 extern const struct bpf_map_ops bpf_map_offload_ops;
296 /* bpf_type_flag contains a set of flags that are applicable to the values of
297 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
298 * or a memory is read-only. We classify types into two categories: base types
299 * and extended types. Extended types are base types combined with a type flag.
301 * Currently there are no more than 32 base types in arg_type, ret_type and
304 #define BPF_BASE_TYPE_BITS 8
307 /* PTR may be NULL. */
308 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
310 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
311 * compatible with both mutable and immutable memory.
313 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
315 __BPF_TYPE_LAST_FLAG = MEM_RDONLY,
318 /* Max number of base types. */
319 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
321 /* Max number of all types. */
322 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
324 /* function argument constraints */
326 ARG_DONTCARE = 0, /* unused argument in helper function */
328 /* the following constraints used to prototype
329 * bpf_map_lookup/update/delete_elem() functions
331 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
332 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
333 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
334 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */
336 /* the following constraints used to prototype bpf_memcmp() and other
337 * functions that access data on eBPF program stack
339 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
340 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized,
341 * helper function must fill all bytes or clear
342 * them in error case.
345 ARG_CONST_SIZE, /* number of bytes accessed from memory */
346 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
348 ARG_PTR_TO_CTX, /* pointer to context */
349 ARG_ANYTHING, /* any (initialized) argument is ok */
350 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
351 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
352 ARG_PTR_TO_INT, /* pointer to int */
353 ARG_PTR_TO_LONG, /* pointer to long */
354 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
355 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
356 ARG_PTR_TO_ALLOC_MEM, /* pointer to dynamically allocated memory */
357 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
358 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
359 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
360 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
361 ARG_PTR_TO_STACK, /* pointer to stack */
362 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
363 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
366 /* Extended arg_types. */
367 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
368 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
369 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
370 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
371 ARG_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM,
372 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
374 /* This must be the last entry. Its purpose is to ensure the enum is
375 * wide enough to hold the higher bits reserved for bpf_type_flag.
377 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
379 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
381 /* type of values returned from helper functions */
382 enum bpf_return_type {
383 RET_INTEGER, /* function returns integer */
384 RET_VOID, /* function doesn't return anything */
385 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
386 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
387 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
388 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
389 RET_PTR_TO_ALLOC_MEM, /* returns a pointer to dynamically allocated memory */
390 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
391 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
394 /* Extended ret_types. */
395 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
396 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
397 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
398 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
399 RET_PTR_TO_ALLOC_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_ALLOC_MEM,
400 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
402 /* This must be the last entry. Its purpose is to ensure the enum is
403 * wide enough to hold the higher bits reserved for bpf_type_flag.
405 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
407 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
409 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
410 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
411 * instructions after verifying
413 struct bpf_func_proto {
414 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
417 enum bpf_return_type ret_type;
420 enum bpf_arg_type arg1_type;
421 enum bpf_arg_type arg2_type;
422 enum bpf_arg_type arg3_type;
423 enum bpf_arg_type arg4_type;
424 enum bpf_arg_type arg5_type;
426 enum bpf_arg_type arg_type[5];
438 int *ret_btf_id; /* return value btf_id */
439 bool (*allowed)(const struct bpf_prog *prog);
442 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
443 * the first argument to eBPF programs.
444 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
448 enum bpf_access_type {
453 /* types of values stored in eBPF registers */
454 /* Pointer types represent:
457 * pointer + (u16) var
458 * pointer + (u16) var + imm
459 * if (range > 0) then [ptr, ptr + range - off) is safe to access
460 * if (id > 0) means that some 'var' was added
461 * if (off > 0) means that 'imm' was added
464 NOT_INIT = 0, /* nothing was written into register */
465 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
466 PTR_TO_CTX, /* reg points to bpf_context */
467 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
468 PTR_TO_MAP_VALUE, /* reg points to map element value */
469 PTR_TO_MAP_KEY, /* reg points to a map element key */
470 PTR_TO_STACK, /* reg == frame_pointer + offset */
471 PTR_TO_PACKET_META, /* skb->data - meta_len */
472 PTR_TO_PACKET, /* reg points to skb->data */
473 PTR_TO_PACKET_END, /* skb->data + headlen */
474 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
475 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
476 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
477 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
478 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
479 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
480 /* PTR_TO_BTF_ID points to a kernel struct that does not need
481 * to be null checked by the BPF program. This does not imply the
482 * pointer is _not_ null and in practice this can easily be a null
483 * pointer when reading pointer chains. The assumption is program
484 * context will handle null pointer dereference typically via fault
485 * handling. The verifier must keep this in mind and can make no
486 * assumptions about null or non-null when doing branch analysis.
487 * Further, when passed into helpers the helpers can not, without
488 * additional context, assume the value is non-null.
491 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
492 * been checked for null. Used primarily to inform the verifier
493 * an explicit null check is required for this struct.
495 PTR_TO_MEM, /* reg points to valid memory region */
496 PTR_TO_BUF, /* reg points to a read/write buffer */
497 PTR_TO_PERCPU_BTF_ID, /* reg points to a percpu kernel variable */
498 PTR_TO_FUNC, /* reg points to a bpf program function */
501 /* Extended reg_types. */
502 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
503 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
504 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
505 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
506 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
508 /* This must be the last entry. Its purpose is to ensure the enum is
509 * wide enough to hold the higher bits reserved for bpf_type_flag.
511 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
513 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
515 /* The information passed from prog-specific *_is_valid_access
516 * back to the verifier.
518 struct bpf_insn_access_aux {
519 enum bpf_reg_type reg_type;
527 struct bpf_verifier_log *log; /* for verbose logs */
531 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
533 aux->ctx_field_size = size;
536 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
538 return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
539 insn->src_reg == BPF_PSEUDO_FUNC;
542 struct bpf_prog_ops {
543 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
544 union bpf_attr __user *uattr);
547 struct bpf_verifier_ops {
548 /* return eBPF function prototype for verification */
549 const struct bpf_func_proto *
550 (*get_func_proto)(enum bpf_func_id func_id,
551 const struct bpf_prog *prog);
553 /* return true if 'size' wide access at offset 'off' within bpf_context
554 * with 'type' (read or write) is allowed
556 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
557 const struct bpf_prog *prog,
558 struct bpf_insn_access_aux *info);
559 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
560 const struct bpf_prog *prog);
561 int (*gen_ld_abs)(const struct bpf_insn *orig,
562 struct bpf_insn *insn_buf);
563 u32 (*convert_ctx_access)(enum bpf_access_type type,
564 const struct bpf_insn *src,
565 struct bpf_insn *dst,
566 struct bpf_prog *prog, u32 *target_size);
567 int (*btf_struct_access)(struct bpf_verifier_log *log,
568 const struct btf *btf,
569 const struct btf_type *t, int off, int size,
570 enum bpf_access_type atype,
572 bool (*check_kfunc_call)(u32 kfunc_btf_id);
575 struct bpf_prog_offload_ops {
576 /* verifier basic callbacks */
577 int (*insn_hook)(struct bpf_verifier_env *env,
578 int insn_idx, int prev_insn_idx);
579 int (*finalize)(struct bpf_verifier_env *env);
580 /* verifier optimization callbacks (called after .finalize) */
581 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
582 struct bpf_insn *insn);
583 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
584 /* program management callbacks */
585 int (*prepare)(struct bpf_prog *prog);
586 int (*translate)(struct bpf_prog *prog);
587 void (*destroy)(struct bpf_prog *prog);
590 struct bpf_prog_offload {
591 struct bpf_prog *prog;
592 struct net_device *netdev;
593 struct bpf_offload_dev *offdev;
595 struct list_head offloads;
602 enum bpf_cgroup_storage_type {
603 BPF_CGROUP_STORAGE_SHARED,
604 BPF_CGROUP_STORAGE_PERCPU,
605 __BPF_CGROUP_STORAGE_MAX
608 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
610 /* The longest tracepoint has 12 args.
611 * See include/trace/bpf_probe.h
613 #define MAX_BPF_FUNC_ARGS 12
615 /* The maximum number of arguments passed through registers
616 * a single function may have.
618 #define MAX_BPF_FUNC_REG_ARGS 5
620 struct btf_func_model {
623 u8 arg_size[MAX_BPF_FUNC_ARGS];
626 /* Restore arguments before returning from trampoline to let original function
627 * continue executing. This flag is used for fentry progs when there are no
630 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
631 /* Call original function after fentry progs, but before fexit progs.
632 * Makes sense for fentry/fexit, normal calls and indirect calls.
634 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
635 /* Skip current frame and return to parent. Makes sense for fentry/fexit
636 * programs only. Should not be used with normal calls and indirect calls.
638 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
639 /* Store IP address of the caller on the trampoline stack,
640 * so it's available for trampoline's programs.
642 #define BPF_TRAMP_F_IP_ARG BIT(3)
643 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
644 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
646 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
647 * bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
649 #define BPF_MAX_TRAMP_PROGS 38
651 struct bpf_tramp_progs {
652 struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
656 /* Different use cases for BPF trampoline:
657 * 1. replace nop at the function entry (kprobe equivalent)
658 * flags = BPF_TRAMP_F_RESTORE_REGS
659 * fentry = a set of programs to run before returning from trampoline
661 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
662 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
663 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
664 * fentry = a set of program to run before calling original function
665 * fexit = a set of program to run after original function
667 * 3. replace direct call instruction anywhere in the function body
668 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
670 * fentry = a set of programs to run before returning from trampoline
671 * With flags = BPF_TRAMP_F_CALL_ORIG
672 * orig_call = original callback addr or direct function addr
673 * fentry = a set of program to run before calling original function
674 * fexit = a set of program to run after original function
676 struct bpf_tramp_image;
677 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
678 const struct btf_func_model *m, u32 flags,
679 struct bpf_tramp_progs *tprogs,
681 /* these two functions are called from generated trampoline */
682 u64 notrace __bpf_prog_enter(struct bpf_prog *prog);
683 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);
684 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog);
685 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start);
686 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
687 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
692 char name[KSYM_NAME_LEN];
693 struct list_head lnode;
694 struct latch_tree_node tnode;
698 enum bpf_tramp_prog_type {
701 BPF_TRAMP_MODIFY_RETURN,
703 BPF_TRAMP_REPLACE, /* more than MAX */
706 struct bpf_tramp_image {
708 struct bpf_ksym ksym;
709 struct percpu_ref pcref;
714 struct work_struct work;
718 struct bpf_trampoline {
719 /* hlist for trampoline_table */
720 struct hlist_node hlist;
721 /* serializes access to fields of this trampoline */
726 struct btf_func_model model;
730 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
731 * program by replacing one of its functions. func.addr is the address
732 * of the function it replaced.
734 struct bpf_prog *extension_prog;
735 /* list of BPF programs using this trampoline */
736 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
737 /* Number of attached programs. A counter per kind. */
738 int progs_cnt[BPF_TRAMP_MAX];
739 /* Executable image of trampoline */
740 struct bpf_tramp_image *cur_image;
745 struct bpf_attach_target_info {
746 struct btf_func_model fmodel;
748 const char *tgt_name;
749 const struct btf_type *tgt_type;
752 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
754 struct bpf_dispatcher_prog {
755 struct bpf_prog *prog;
759 struct bpf_dispatcher {
760 /* dispatcher mutex */
763 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
767 struct bpf_ksym ksym;
770 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
772 const struct bpf_insn *insnsi,
773 unsigned int (*bpf_func)(const void *,
774 const struct bpf_insn *))
776 return bpf_func(ctx, insnsi);
778 #ifdef CONFIG_BPF_JIT
779 int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
780 int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
781 struct bpf_trampoline *bpf_trampoline_get(u64 key,
782 struct bpf_attach_target_info *tgt_info);
783 void bpf_trampoline_put(struct bpf_trampoline *tr);
784 int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
785 #define BPF_DISPATCHER_INIT(_name) { \
786 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
787 .func = &_name##_func, \
794 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
798 #define DEFINE_BPF_DISPATCHER(name) \
799 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
801 const struct bpf_insn *insnsi, \
802 unsigned int (*bpf_func)(const void *, \
803 const struct bpf_insn *)) \
805 return bpf_func(ctx, insnsi); \
807 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
808 struct bpf_dispatcher bpf_dispatcher_##name = \
809 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
810 #define DECLARE_BPF_DISPATCHER(name) \
811 unsigned int bpf_dispatcher_##name##_func( \
813 const struct bpf_insn *insnsi, \
814 unsigned int (*bpf_func)(const void *, \
815 const struct bpf_insn *)); \
816 extern struct bpf_dispatcher bpf_dispatcher_##name;
817 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
818 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
819 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
820 struct bpf_prog *to);
821 /* Called only from JIT-enabled code, so there's no need for stubs. */
822 void *bpf_jit_alloc_exec_page(void);
823 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
824 void bpf_image_ksym_del(struct bpf_ksym *ksym);
825 void bpf_ksym_add(struct bpf_ksym *ksym);
826 void bpf_ksym_del(struct bpf_ksym *ksym);
827 int bpf_jit_charge_modmem(u32 pages);
828 void bpf_jit_uncharge_modmem(u32 pages);
830 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
831 struct bpf_trampoline *tr)
835 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
836 struct bpf_trampoline *tr)
840 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
841 struct bpf_attach_target_info *tgt_info)
843 return ERR_PTR(-EOPNOTSUPP);
845 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
846 #define DEFINE_BPF_DISPATCHER(name)
847 #define DECLARE_BPF_DISPATCHER(name)
848 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
849 #define BPF_DISPATCHER_PTR(name) NULL
850 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
851 struct bpf_prog *from,
852 struct bpf_prog *to) {}
853 static inline bool is_bpf_image_address(unsigned long address)
859 struct bpf_func_info_aux {
864 enum bpf_jit_poke_reason {
865 BPF_POKE_REASON_TAIL_CALL,
868 /* Descriptor of pokes pointing /into/ the JITed image. */
869 struct bpf_jit_poke_descriptor {
870 void *tailcall_target;
871 void *tailcall_bypass;
880 bool tailcall_target_stable;
886 /* reg_type info for ctx arguments */
887 struct bpf_ctx_arg_aux {
889 enum bpf_reg_type reg_type;
893 struct btf_mod_pair {
895 struct module *module;
898 struct bpf_kfunc_desc_tab;
900 struct bpf_prog_aux {
909 u32 func_cnt; /* used by non-func prog as the number of func progs */
910 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
911 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
912 u32 ctx_arg_info_size;
913 u32 max_rdonly_access;
915 struct btf *attach_btf;
916 const struct bpf_ctx_arg_aux *ctx_arg_info;
917 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
918 struct bpf_prog *dst_prog;
919 struct bpf_trampoline *dst_trampoline;
920 enum bpf_prog_type saved_dst_prog_type;
921 enum bpf_attach_type saved_dst_attach_type;
922 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
923 bool offload_requested;
924 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
925 bool func_proto_unreliable;
927 bool tail_call_reachable;
928 struct hlist_node tramp_hlist;
929 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
930 const struct btf_type *attach_func_proto;
931 /* function name for valid attach_btf_id */
932 const char *attach_func_name;
933 struct bpf_prog **func;
934 void *jit_data; /* JIT specific data. arch dependent */
935 struct bpf_jit_poke_descriptor *poke_tab;
936 struct bpf_kfunc_desc_tab *kfunc_tab;
938 struct bpf_ksym ksym;
939 const struct bpf_prog_ops *ops;
940 struct bpf_map **used_maps;
941 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
942 struct btf_mod_pair *used_btfs;
943 struct bpf_prog *prog;
944 struct user_struct *user;
945 u64 load_time; /* ns since boottime */
946 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
947 char name[BPF_OBJ_NAME_LEN];
948 #ifdef CONFIG_SECURITY
951 struct bpf_prog_offload *offload;
953 struct bpf_func_info *func_info;
954 struct bpf_func_info_aux *func_info_aux;
955 /* bpf_line_info loaded from userspace. linfo->insn_off
956 * has the xlated insn offset.
957 * Both the main and sub prog share the same linfo.
958 * The subprog can access its first linfo by
959 * using the linfo_idx.
961 struct bpf_line_info *linfo;
962 /* jited_linfo is the jited addr of the linfo. It has a
963 * one to one mapping to linfo:
964 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
965 * Both the main and sub prog share the same jited_linfo.
966 * The subprog can access its first jited_linfo by
967 * using the linfo_idx.
972 /* subprog can use linfo_idx to access its first linfo and
974 * main prog always has linfo_idx == 0
978 struct exception_table_entry *extable;
980 struct work_struct work;
985 struct bpf_array_aux {
986 /* 'Ownership' of prog array is claimed by the first program that
987 * is going to use this map or by the first program which FD is
988 * stored in the map to make sure that all callers and callees have
989 * the same prog type and JITed flag.
993 enum bpf_prog_type type;
996 /* Programs with direct jumps into programs part of this array. */
997 struct list_head poke_progs;
999 struct mutex poke_mutex;
1000 struct work_struct work;
1006 enum bpf_link_type type;
1007 const struct bpf_link_ops *ops;
1008 struct bpf_prog *prog;
1009 struct work_struct work;
1012 struct bpf_link_ops {
1013 void (*release)(struct bpf_link *link);
1014 void (*dealloc)(struct bpf_link *link);
1015 int (*detach)(struct bpf_link *link);
1016 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1017 struct bpf_prog *old_prog);
1018 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1019 int (*fill_link_info)(const struct bpf_link *link,
1020 struct bpf_link_info *info);
1023 struct bpf_link_primer {
1024 struct bpf_link *link;
1030 struct bpf_struct_ops_value;
1033 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1034 struct bpf_struct_ops {
1035 const struct bpf_verifier_ops *verifier_ops;
1036 int (*init)(struct btf *btf);
1037 int (*check_member)(const struct btf_type *t,
1038 const struct btf_member *member);
1039 int (*init_member)(const struct btf_type *t,
1040 const struct btf_member *member,
1041 void *kdata, const void *udata);
1042 int (*reg)(void *kdata);
1043 void (*unreg)(void *kdata);
1044 const struct btf_type *type;
1045 const struct btf_type *value_type;
1047 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1052 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1053 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1054 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1055 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1056 bool bpf_struct_ops_get(const void *kdata);
1057 void bpf_struct_ops_put(const void *kdata);
1058 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1060 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1062 if (owner == BPF_MODULE_OWNER)
1063 return bpf_struct_ops_get(data);
1065 return try_module_get(owner);
1067 static inline void bpf_module_put(const void *data, struct module *owner)
1069 if (owner == BPF_MODULE_OWNER)
1070 bpf_struct_ops_put(data);
1075 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1079 static inline void bpf_struct_ops_init(struct btf *btf,
1080 struct bpf_verifier_log *log)
1083 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1085 return try_module_get(owner);
1087 static inline void bpf_module_put(const void *data, struct module *owner)
1091 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1103 struct bpf_array_aux *aux;
1105 char value[0] __aligned(8);
1106 void *ptrs[0] __aligned(8);
1107 void __percpu *pptrs[0] __aligned(8);
1111 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1112 #define MAX_TAIL_CALL_CNT 32
1114 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1115 BPF_F_RDONLY_PROG | \
1119 #define BPF_MAP_CAN_READ BIT(0)
1120 #define BPF_MAP_CAN_WRITE BIT(1)
1122 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1124 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1126 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1129 if (access_flags & BPF_F_RDONLY_PROG)
1130 return BPF_MAP_CAN_READ;
1131 else if (access_flags & BPF_F_WRONLY_PROG)
1132 return BPF_MAP_CAN_WRITE;
1134 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1137 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1139 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1140 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1143 struct bpf_event_entry {
1144 struct perf_event *event;
1145 struct file *perf_file;
1146 struct file *map_file;
1147 struct rcu_head rcu;
1150 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
1151 int bpf_prog_calc_tag(struct bpf_prog *fp);
1153 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1155 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1156 unsigned long off, unsigned long len);
1157 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1158 const struct bpf_insn *src,
1159 struct bpf_insn *dst,
1160 struct bpf_prog *prog,
1163 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1164 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1166 /* an array of programs to be executed under rcu_lock.
1169 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, bpf_prog_run);
1171 * the structure returned by bpf_prog_array_alloc() should be populated
1172 * with program pointers and the last pointer must be NULL.
1173 * The user has to keep refcnt on the program and make sure the program
1174 * is removed from the array before bpf_prog_put().
1175 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1176 * since other cpus are walking the array of pointers in parallel.
1178 struct bpf_prog_array_item {
1179 struct bpf_prog *prog;
1181 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1186 struct bpf_prog_array {
1187 struct rcu_head rcu;
1188 struct bpf_prog_array_item items[];
1191 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1192 void bpf_prog_array_free(struct bpf_prog_array *progs);
1193 int bpf_prog_array_length(struct bpf_prog_array *progs);
1194 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1195 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1196 __u32 __user *prog_ids, u32 cnt);
1198 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1199 struct bpf_prog *old_prog);
1200 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1201 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1202 struct bpf_prog *prog);
1203 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1204 u32 *prog_ids, u32 request_cnt,
1206 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1207 struct bpf_prog *exclude_prog,
1208 struct bpf_prog *include_prog,
1210 struct bpf_prog_array **new_array);
1212 struct bpf_run_ctx {};
1214 struct bpf_cg_run_ctx {
1215 struct bpf_run_ctx run_ctx;
1216 const struct bpf_prog_array_item *prog_item;
1219 struct bpf_trace_run_ctx {
1220 struct bpf_run_ctx run_ctx;
1224 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1226 struct bpf_run_ctx *old_ctx = NULL;
1228 #ifdef CONFIG_BPF_SYSCALL
1229 old_ctx = current->bpf_ctx;
1230 current->bpf_ctx = new_ctx;
1235 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1237 #ifdef CONFIG_BPF_SYSCALL
1238 current->bpf_ctx = old_ctx;
1242 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1243 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1244 /* BPF program asks to set CN on the packet. */
1245 #define BPF_RET_SET_CN (1 << 0)
1247 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1249 static __always_inline u32
1250 BPF_PROG_RUN_ARRAY_CG_FLAGS(const struct bpf_prog_array __rcu *array_rcu,
1251 const void *ctx, bpf_prog_run_fn run_prog,
1254 const struct bpf_prog_array_item *item;
1255 const struct bpf_prog *prog;
1256 const struct bpf_prog_array *array;
1257 struct bpf_run_ctx *old_run_ctx;
1258 struct bpf_cg_run_ctx run_ctx;
1264 array = rcu_dereference(array_rcu);
1265 item = &array->items[0];
1266 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1267 while ((prog = READ_ONCE(item->prog))) {
1268 run_ctx.prog_item = item;
1269 func_ret = run_prog(prog, ctx);
1270 ret &= (func_ret & 1);
1271 *(ret_flags) |= (func_ret >> 1);
1274 bpf_reset_run_ctx(old_run_ctx);
1280 static __always_inline u32
1281 BPF_PROG_RUN_ARRAY_CG(const struct bpf_prog_array __rcu *array_rcu,
1282 const void *ctx, bpf_prog_run_fn run_prog)
1284 const struct bpf_prog_array_item *item;
1285 const struct bpf_prog *prog;
1286 const struct bpf_prog_array *array;
1287 struct bpf_run_ctx *old_run_ctx;
1288 struct bpf_cg_run_ctx run_ctx;
1293 array = rcu_dereference(array_rcu);
1294 item = &array->items[0];
1295 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1296 while ((prog = READ_ONCE(item->prog))) {
1297 run_ctx.prog_item = item;
1298 ret &= run_prog(prog, ctx);
1301 bpf_reset_run_ctx(old_run_ctx);
1307 static __always_inline u32
1308 BPF_PROG_RUN_ARRAY(const struct bpf_prog_array __rcu *array_rcu,
1309 const void *ctx, bpf_prog_run_fn run_prog)
1311 const struct bpf_prog_array_item *item;
1312 const struct bpf_prog *prog;
1313 const struct bpf_prog_array *array;
1314 struct bpf_run_ctx *old_run_ctx;
1315 struct bpf_trace_run_ctx run_ctx;
1320 array = rcu_dereference(array_rcu);
1321 if (unlikely(!array))
1323 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1324 item = &array->items[0];
1325 while ((prog = READ_ONCE(item->prog))) {
1326 run_ctx.bpf_cookie = item->bpf_cookie;
1327 ret &= run_prog(prog, ctx);
1330 bpf_reset_run_ctx(old_run_ctx);
1337 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
1338 * so BPF programs can request cwr for TCP packets.
1340 * Current cgroup skb programs can only return 0 or 1 (0 to drop the
1341 * packet. This macro changes the behavior so the low order bit
1342 * indicates whether the packet should be dropped (0) or not (1)
1343 * and the next bit is a congestion notification bit. This could be
1344 * used by TCP to call tcp_enter_cwr()
1346 * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
1349 * 2: drop packet and cn
1350 * 3: keep packet and cn
1352 * This macro then converts it to one of the NET_XMIT or an error
1353 * code that is then interpreted as drop packet (and no cn):
1354 * 0: NET_XMIT_SUCCESS skb should be transmitted
1355 * 1: NET_XMIT_DROP skb should be dropped and cn
1356 * 2: NET_XMIT_CN skb should be transmitted and cn
1357 * 3: -EPERM skb should be dropped
1359 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func) \
1364 _ret = BPF_PROG_RUN_ARRAY_CG_FLAGS(array, ctx, func, &_flags); \
1365 _cn = _flags & BPF_RET_SET_CN; \
1367 _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
1369 _ret = (_cn ? NET_XMIT_DROP : -EPERM); \
1373 #ifdef CONFIG_BPF_SYSCALL
1374 DECLARE_PER_CPU(int, bpf_prog_active);
1375 extern struct mutex bpf_stats_enabled_mutex;
1378 * Block execution of BPF programs attached to instrumentation (perf,
1379 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
1380 * these events can happen inside a region which holds a map bucket lock
1381 * and can deadlock on it.
1383 static inline void bpf_disable_instrumentation(void)
1386 this_cpu_inc(bpf_prog_active);
1389 static inline void bpf_enable_instrumentation(void)
1391 this_cpu_dec(bpf_prog_active);
1395 extern const struct file_operations bpf_map_fops;
1396 extern const struct file_operations bpf_prog_fops;
1397 extern const struct file_operations bpf_iter_fops;
1399 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1400 extern const struct bpf_prog_ops _name ## _prog_ops; \
1401 extern const struct bpf_verifier_ops _name ## _verifier_ops;
1402 #define BPF_MAP_TYPE(_id, _ops) \
1403 extern const struct bpf_map_ops _ops;
1404 #define BPF_LINK_TYPE(_id, _name)
1405 #include <linux/bpf_types.h>
1406 #undef BPF_PROG_TYPE
1408 #undef BPF_LINK_TYPE
1410 extern const struct bpf_prog_ops bpf_offload_prog_ops;
1411 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
1412 extern const struct bpf_verifier_ops xdp_analyzer_ops;
1414 struct bpf_prog *bpf_prog_get(u32 ufd);
1415 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1417 void bpf_prog_add(struct bpf_prog *prog, int i);
1418 void bpf_prog_sub(struct bpf_prog *prog, int i);
1419 void bpf_prog_inc(struct bpf_prog *prog);
1420 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
1421 void bpf_prog_put(struct bpf_prog *prog);
1423 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
1424 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
1426 struct bpf_map *bpf_map_get(u32 ufd);
1427 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
1428 struct bpf_map *__bpf_map_get(struct fd f);
1429 void bpf_map_inc(struct bpf_map *map);
1430 void bpf_map_inc_with_uref(struct bpf_map *map);
1431 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
1432 void bpf_map_put_with_uref(struct bpf_map *map);
1433 void bpf_map_put(struct bpf_map *map);
1434 void *bpf_map_area_alloc(u64 size, int numa_node);
1435 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
1436 void bpf_map_area_free(void *base);
1437 bool bpf_map_write_active(const struct bpf_map *map);
1438 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
1439 int generic_map_lookup_batch(struct bpf_map *map,
1440 const union bpf_attr *attr,
1441 union bpf_attr __user *uattr);
1442 int generic_map_update_batch(struct bpf_map *map,
1443 const union bpf_attr *attr,
1444 union bpf_attr __user *uattr);
1445 int generic_map_delete_batch(struct bpf_map *map,
1446 const union bpf_attr *attr,
1447 union bpf_attr __user *uattr);
1448 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
1449 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
1451 #ifdef CONFIG_MEMCG_KMEM
1452 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1454 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
1455 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
1456 size_t align, gfp_t flags);
1458 static inline void *
1459 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
1462 return kmalloc_node(size, flags, node);
1465 static inline void *
1466 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
1468 return kzalloc(size, flags);
1471 static inline void __percpu *
1472 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
1475 return __alloc_percpu_gfp(size, align, flags);
1479 extern int sysctl_unprivileged_bpf_disabled;
1481 static inline bool bpf_allow_ptr_leaks(void)
1483 return perfmon_capable();
1486 static inline bool bpf_allow_uninit_stack(void)
1488 return perfmon_capable();
1491 static inline bool bpf_allow_ptr_to_map_access(void)
1493 return perfmon_capable();
1496 static inline bool bpf_bypass_spec_v1(void)
1498 return perfmon_capable();
1501 static inline bool bpf_bypass_spec_v4(void)
1503 return perfmon_capable();
1506 int bpf_map_new_fd(struct bpf_map *map, int flags);
1507 int bpf_prog_new_fd(struct bpf_prog *prog);
1509 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1510 const struct bpf_link_ops *ops, struct bpf_prog *prog);
1511 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
1512 int bpf_link_settle(struct bpf_link_primer *primer);
1513 void bpf_link_cleanup(struct bpf_link_primer *primer);
1514 void bpf_link_inc(struct bpf_link *link);
1515 void bpf_link_put(struct bpf_link *link);
1516 int bpf_link_new_fd(struct bpf_link *link);
1517 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
1518 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
1520 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
1521 int bpf_obj_get_user(const char __user *pathname, int flags);
1523 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
1524 #define DEFINE_BPF_ITER_FUNC(target, args...) \
1525 extern int bpf_iter_ ## target(args); \
1526 int __init bpf_iter_ ## target(args) { return 0; }
1528 struct bpf_iter_aux_info {
1529 struct bpf_map *map;
1532 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
1533 union bpf_iter_link_info *linfo,
1534 struct bpf_iter_aux_info *aux);
1535 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
1536 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
1537 struct seq_file *seq);
1538 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
1539 struct bpf_link_info *info);
1540 typedef const struct bpf_func_proto *
1541 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
1542 const struct bpf_prog *prog);
1544 enum bpf_iter_feature {
1545 BPF_ITER_RESCHED = BIT(0),
1548 #define BPF_ITER_CTX_ARG_MAX 2
1549 struct bpf_iter_reg {
1551 bpf_iter_attach_target_t attach_target;
1552 bpf_iter_detach_target_t detach_target;
1553 bpf_iter_show_fdinfo_t show_fdinfo;
1554 bpf_iter_fill_link_info_t fill_link_info;
1555 bpf_iter_get_func_proto_t get_func_proto;
1556 u32 ctx_arg_info_size;
1558 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
1559 const struct bpf_iter_seq_info *seq_info;
1562 struct bpf_iter_meta {
1563 __bpf_md_ptr(struct seq_file *, seq);
1568 struct bpf_iter__bpf_map_elem {
1569 __bpf_md_ptr(struct bpf_iter_meta *, meta);
1570 __bpf_md_ptr(struct bpf_map *, map);
1571 __bpf_md_ptr(void *, key);
1572 __bpf_md_ptr(void *, value);
1575 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
1576 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
1577 bool bpf_iter_prog_supported(struct bpf_prog *prog);
1578 const struct bpf_func_proto *
1579 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
1580 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
1581 int bpf_iter_new_fd(struct bpf_link *link);
1582 bool bpf_link_is_iter(struct bpf_link *link);
1583 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
1584 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
1585 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
1586 struct seq_file *seq);
1587 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
1588 struct bpf_link_info *info);
1590 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
1591 struct bpf_func_state *caller,
1592 struct bpf_func_state *callee);
1594 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
1595 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
1596 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
1598 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
1601 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
1603 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
1604 void *key, void *value, u64 map_flags);
1605 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1606 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
1607 void *key, void *value, u64 map_flags);
1608 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
1610 int bpf_get_file_flag(int flags);
1611 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
1612 size_t actual_size);
1614 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
1615 * forced to use 'long' read/writes to try to atomically copy long counters.
1616 * Best-effort only. No barriers here, since it _will_ race with concurrent
1617 * updates from BPF programs. Called from bpf syscall and mostly used with
1618 * size 8 or 16 bytes, so ask compiler to inline it.
1620 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
1622 const long *lsrc = src;
1625 size /= sizeof(long);
1630 /* verify correctness of eBPF program */
1631 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
1633 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1634 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
1637 struct btf *bpf_get_btf_vmlinux(void);
1642 struct bpf_dtab_netdev;
1643 struct bpf_cpu_map_entry;
1645 void __dev_flush(void);
1646 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1647 struct net_device *dev_rx);
1648 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1649 struct net_device *dev_rx);
1650 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1651 struct bpf_map *map, bool exclude_ingress);
1652 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
1653 struct bpf_prog *xdp_prog);
1654 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1655 struct bpf_prog *xdp_prog, struct bpf_map *map,
1656 bool exclude_ingress);
1658 void __cpu_map_flush(void);
1659 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
1660 struct net_device *dev_rx);
1661 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1662 struct sk_buff *skb);
1664 /* Return map's numa specified by userspace */
1665 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
1667 return (attr->map_flags & BPF_F_NUMA_NODE) ?
1668 attr->numa_node : NUMA_NO_NODE;
1671 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
1672 int array_map_alloc_check(union bpf_attr *attr);
1674 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1675 union bpf_attr __user *uattr);
1676 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1677 union bpf_attr __user *uattr);
1678 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1679 const union bpf_attr *kattr,
1680 union bpf_attr __user *uattr);
1681 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1682 const union bpf_attr *kattr,
1683 union bpf_attr __user *uattr);
1684 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
1685 const union bpf_attr *kattr,
1686 union bpf_attr __user *uattr);
1687 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1688 const union bpf_attr *kattr,
1689 union bpf_attr __user *uattr);
1690 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id);
1691 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
1692 const struct bpf_prog *prog,
1693 struct bpf_insn_access_aux *info);
1694 int btf_struct_access(struct bpf_verifier_log *log, const struct btf *btf,
1695 const struct btf_type *t, int off, int size,
1696 enum bpf_access_type atype,
1698 bool btf_struct_ids_match(struct bpf_verifier_log *log,
1699 const struct btf *btf, u32 id, int off,
1700 const struct btf *need_btf, u32 need_type_id);
1702 int btf_distill_func_proto(struct bpf_verifier_log *log,
1704 const struct btf_type *func_proto,
1705 const char *func_name,
1706 struct btf_func_model *m);
1708 struct bpf_reg_state;
1709 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
1710 struct bpf_reg_state *regs);
1711 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
1712 const struct btf *btf, u32 func_id,
1713 struct bpf_reg_state *regs);
1714 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
1715 struct bpf_reg_state *reg);
1716 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
1717 struct btf *btf, const struct btf_type *t);
1719 struct bpf_prog *bpf_prog_by_id(u32 id);
1720 struct bpf_link *bpf_link_by_id(u32 id);
1722 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
1723 void bpf_task_storage_free(struct task_struct *task);
1724 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
1725 const struct btf_func_model *
1726 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1727 const struct bpf_insn *insn);
1729 static inline bool unprivileged_ebpf_enabled(void)
1731 return !sysctl_unprivileged_bpf_disabled;
1734 #else /* !CONFIG_BPF_SYSCALL */
1735 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
1737 return ERR_PTR(-EOPNOTSUPP);
1740 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
1741 enum bpf_prog_type type,
1744 return ERR_PTR(-EOPNOTSUPP);
1747 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
1751 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
1755 static inline void bpf_prog_put(struct bpf_prog *prog)
1759 static inline void bpf_prog_inc(struct bpf_prog *prog)
1763 static inline struct bpf_prog *__must_check
1764 bpf_prog_inc_not_zero(struct bpf_prog *prog)
1766 return ERR_PTR(-EOPNOTSUPP);
1769 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
1770 const struct bpf_link_ops *ops,
1771 struct bpf_prog *prog)
1775 static inline int bpf_link_prime(struct bpf_link *link,
1776 struct bpf_link_primer *primer)
1781 static inline int bpf_link_settle(struct bpf_link_primer *primer)
1786 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
1790 static inline void bpf_link_inc(struct bpf_link *link)
1794 static inline void bpf_link_put(struct bpf_link *link)
1798 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
1803 static inline bool dev_map_can_have_prog(struct bpf_map *map)
1808 static inline void __dev_flush(void)
1813 struct bpf_dtab_netdev;
1814 struct bpf_cpu_map_entry;
1817 int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
1818 struct net_device *dev_rx)
1824 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
1825 struct net_device *dev_rx)
1831 int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
1832 struct bpf_map *map, bool exclude_ingress)
1839 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
1840 struct sk_buff *skb,
1841 struct bpf_prog *xdp_prog)
1847 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
1848 struct bpf_prog *xdp_prog, struct bpf_map *map,
1849 bool exclude_ingress)
1854 static inline void __cpu_map_flush(void)
1858 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
1859 struct xdp_buff *xdp,
1860 struct net_device *dev_rx)
1865 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
1866 struct sk_buff *skb)
1871 static inline bool cpu_map_prog_allowed(struct bpf_map *map)
1876 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
1877 enum bpf_prog_type type)
1879 return ERR_PTR(-EOPNOTSUPP);
1882 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
1883 const union bpf_attr *kattr,
1884 union bpf_attr __user *uattr)
1889 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
1890 const union bpf_attr *kattr,
1891 union bpf_attr __user *uattr)
1896 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
1897 const union bpf_attr *kattr,
1898 union bpf_attr __user *uattr)
1903 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1904 const union bpf_attr *kattr,
1905 union bpf_attr __user *uattr)
1910 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
1911 const union bpf_attr *kattr,
1912 union bpf_attr __user *uattr)
1917 static inline bool bpf_prog_test_check_kfunc_call(u32 kfunc_id)
1922 static inline void bpf_map_put(struct bpf_map *map)
1926 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
1928 return ERR_PTR(-ENOTSUPP);
1931 static inline const struct bpf_func_proto *
1932 bpf_base_func_proto(enum bpf_func_id func_id)
1937 static inline void bpf_task_storage_free(struct task_struct *task)
1941 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
1946 static inline const struct btf_func_model *
1947 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
1948 const struct bpf_insn *insn)
1953 static inline bool unprivileged_ebpf_enabled(void)
1958 #endif /* CONFIG_BPF_SYSCALL */
1960 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
1961 struct btf_mod_pair *used_btfs, u32 len);
1963 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
1964 enum bpf_prog_type type)
1966 return bpf_prog_get_type_dev(ufd, type, false);
1969 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
1970 struct bpf_map **used_maps, u32 len);
1972 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
1974 int bpf_prog_offload_compile(struct bpf_prog *prog);
1975 void bpf_prog_offload_destroy(struct bpf_prog *prog);
1976 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
1977 struct bpf_prog *prog);
1979 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1981 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
1982 int bpf_map_offload_update_elem(struct bpf_map *map,
1983 void *key, void *value, u64 flags);
1984 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
1985 int bpf_map_offload_get_next_key(struct bpf_map *map,
1986 void *key, void *next_key);
1988 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
1990 struct bpf_offload_dev *
1991 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
1992 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
1993 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
1994 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
1995 struct net_device *netdev);
1996 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
1997 struct net_device *netdev);
1998 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2000 void unpriv_ebpf_notify(int new_state);
2002 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2003 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
2005 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2007 return aux->offload_requested;
2010 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2012 return unlikely(map->ops == &bpf_map_offload_ops);
2015 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2016 void bpf_map_offload_map_free(struct bpf_map *map);
2017 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2018 const union bpf_attr *kattr,
2019 union bpf_attr __user *uattr);
2021 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2022 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2023 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2024 void sock_map_unhash(struct sock *sk);
2025 void sock_map_close(struct sock *sk, long timeout);
2027 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
2028 union bpf_attr *attr)
2033 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
2038 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
2043 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2045 return ERR_PTR(-EOPNOTSUPP);
2048 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2052 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2053 const union bpf_attr *kattr,
2054 union bpf_attr __user *uattr)
2059 #ifdef CONFIG_BPF_SYSCALL
2060 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2061 struct bpf_prog *prog)
2066 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2067 enum bpf_prog_type ptype)
2072 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2077 #endif /* CONFIG_BPF_SYSCALL */
2078 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2080 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2081 void bpf_sk_reuseport_detach(struct sock *sk);
2082 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2084 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2085 void *value, u64 map_flags);
2087 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2091 #ifdef CONFIG_BPF_SYSCALL
2092 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2093 void *key, void *value)
2098 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2099 void *key, void *value,
2104 #endif /* CONFIG_BPF_SYSCALL */
2105 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2107 /* verifier prototypes for helper functions called from eBPF programs */
2108 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2109 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2110 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2111 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2112 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2113 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2115 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2116 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2117 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2118 extern const struct bpf_func_proto bpf_tail_call_proto;
2119 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2120 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2121 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2122 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2123 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2124 extern const struct bpf_func_proto bpf_get_stackid_proto;
2125 extern const struct bpf_func_proto bpf_get_stack_proto;
2126 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2127 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2128 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2129 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2130 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2131 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
2132 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
2133 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
2134 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
2135 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
2136 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
2137 extern const struct bpf_func_proto bpf_spin_lock_proto;
2138 extern const struct bpf_func_proto bpf_spin_unlock_proto;
2139 extern const struct bpf_func_proto bpf_get_local_storage_proto;
2140 extern const struct bpf_func_proto bpf_strtol_proto;
2141 extern const struct bpf_func_proto bpf_strtoul_proto;
2142 extern const struct bpf_func_proto bpf_tcp_sock_proto;
2143 extern const struct bpf_func_proto bpf_jiffies64_proto;
2144 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
2145 extern const struct bpf_func_proto bpf_event_output_data_proto;
2146 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
2147 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
2148 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
2149 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
2150 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
2151 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
2152 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
2153 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
2154 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
2155 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
2156 extern const struct bpf_func_proto bpf_copy_from_user_proto;
2157 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
2158 extern const struct bpf_func_proto bpf_snprintf_proto;
2159 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
2160 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
2161 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
2162 extern const struct bpf_func_proto bpf_sock_from_file_proto;
2163 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
2164 extern const struct bpf_func_proto bpf_task_storage_get_proto;
2165 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
2166 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
2167 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
2168 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
2169 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
2171 const struct bpf_func_proto *tracing_prog_func_proto(
2172 enum bpf_func_id func_id, const struct bpf_prog *prog);
2174 /* Shared helpers among cBPF and eBPF. */
2175 void bpf_user_rnd_init_once(void);
2176 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2177 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
2179 #if defined(CONFIG_NET)
2180 bool bpf_sock_common_is_valid_access(int off, int size,
2181 enum bpf_access_type type,
2182 struct bpf_insn_access_aux *info);
2183 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2184 struct bpf_insn_access_aux *info);
2185 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2186 const struct bpf_insn *si,
2187 struct bpf_insn *insn_buf,
2188 struct bpf_prog *prog,
2191 static inline bool bpf_sock_common_is_valid_access(int off, int size,
2192 enum bpf_access_type type,
2193 struct bpf_insn_access_aux *info)
2197 static inline bool bpf_sock_is_valid_access(int off, int size,
2198 enum bpf_access_type type,
2199 struct bpf_insn_access_aux *info)
2203 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
2204 const struct bpf_insn *si,
2205 struct bpf_insn *insn_buf,
2206 struct bpf_prog *prog,
2214 struct sk_reuseport_kern {
2215 struct sk_buff *skb;
2217 struct sock *selected_sk;
2218 struct sock *migrating_sk;
2224 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2225 struct bpf_insn_access_aux *info);
2227 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2228 const struct bpf_insn *si,
2229 struct bpf_insn *insn_buf,
2230 struct bpf_prog *prog,
2233 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
2234 struct bpf_insn_access_aux *info);
2236 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2237 const struct bpf_insn *si,
2238 struct bpf_insn *insn_buf,
2239 struct bpf_prog *prog,
2242 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
2243 enum bpf_access_type type,
2244 struct bpf_insn_access_aux *info)
2249 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
2250 const struct bpf_insn *si,
2251 struct bpf_insn *insn_buf,
2252 struct bpf_prog *prog,
2257 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
2258 enum bpf_access_type type,
2259 struct bpf_insn_access_aux *info)
2264 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
2265 const struct bpf_insn *si,
2266 struct bpf_insn *insn_buf,
2267 struct bpf_prog *prog,
2272 #endif /* CONFIG_INET */
2274 enum bpf_text_poke_type {
2279 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
2280 void *addr1, void *addr2);
2283 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
2285 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
2286 u32 **bin_buf, u32 num_args);
2287 void bpf_bprintf_cleanup(void);
2289 #endif /* _LINUX_BPF_H */