1	/* SPDX-License-Identifier: GPL-2.0-only */
2	/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3	*/
4	#ifndef _LINUX_BPF_H
5	#define _LINUX_BPF_H 1
6
7	#include <uapi/linux/bpf.h>
8	#include <uapi/linux/filter.h>
9
10	#include <linux/workqueue.h>
11	#include <linux/file.h>
12	#include <linux/percpu.h>
13	#include <linux/err.h>
14	#include <linux/rbtree_latch.h>
15	#include <linux/numa.h>
16	#include <linux/mm_types.h>
17	#include <linux/wait.h>
18	#include <linux/refcount.h>
19	#include <linux/mutex.h>
20	#include <linux/module.h>
21	#include <linux/kallsyms.h>
22	#include <linux/capability.h>
23	#include <linux/sched/mm.h>
24	#include <linux/slab.h>
25	#include <linux/percpu-refcount.h>
26	#include <linux/stddef.h>
27	#include <linux/bpfptr.h>
28	#include <linux/btf.h>
29	#include <linux/rcupdate_trace.h>
30	#include <linux/static_call.h>
31	#include <linux/memcontrol.h>
32	#include <linux/cfi.h>
33	#include <asm/rqspinlock.h>
34
35	struct bpf_verifier_env;
36	struct bpf_verifier_log;
37	struct perf_event;
38	struct bpf_prog;
39	struct bpf_prog_aux;
40	struct bpf_map;
41	struct bpf_arena;
42	struct sock;
43	struct seq_file;
44	struct btf;
45	struct btf_type;
46	struct exception_table_entry;
47	struct seq_operations;
48	struct bpf_iter_aux_info;
49	struct bpf_local_storage;
50	struct bpf_local_storage_map;
51	struct kobject;
52	struct mem_cgroup;
53	struct module;
54	struct bpf_func_state;
55	struct ftrace_ops;
56	struct cgroup;
57	struct bpf_token;
58	struct user_namespace;
59	struct super_block;
60	struct inode;
61
62	extern struct idr btf_idr;
63	extern spinlock_t btf_idr_lock;
64	extern struct kobject *btf_kobj;
65	extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
66	extern bool bpf_global_ma_set;
67
68	typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
69	typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
70	struct bpf_iter_aux_info *aux);
71	typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
72	typedef unsigned int (*bpf_func_t)(const void *,
73	const struct bpf_insn *);
74	struct bpf_iter_seq_info {
75	const struct seq_operations *seq_ops;
76	bpf_iter_init_seq_priv_t init_seq_private;
77	bpf_iter_fini_seq_priv_t fini_seq_private;
78	u32 seq_priv_size;
79	};
80
81	/* map is generic key/value storage optionally accessible by eBPF programs */
82	struct bpf_map_ops {
83	/* funcs callable from userspace (via syscall) */
84	int (*map_alloc_check)(union bpf_attr *attr);
85	struct bpf_map *(*map_alloc)(union bpf_attr *attr);
86	void (*map_release)(struct bpf_map *map, struct file *map_file);
87	void (*map_free)(struct bpf_map *map);
88	int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
89	void (*map_release_uref)(struct bpf_map *map);
90	void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
91	int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
92	union bpf_attr __user *uattr);
93	int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
94	void *value, u64 flags);
95	int (*map_lookup_and_delete_batch)(struct bpf_map *map,
96	const union bpf_attr *attr,
97	union bpf_attr __user *uattr);
98	int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
99	const union bpf_attr *attr,
100	union bpf_attr __user *uattr);
101	int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
102	union bpf_attr __user *uattr);
103
104	/* funcs callable from userspace and from eBPF programs */
105	void *(*map_lookup_elem)(struct bpf_map *map, void *key);
106	long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
107	long (*map_delete_elem)(struct bpf_map *map, void *key);
108	long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
109	long (*map_pop_elem)(struct bpf_map *map, void *value);
110	long (*map_peek_elem)(struct bpf_map *map, void *value);
111	void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
112
113	/* funcs called by prog_array and perf_event_array map */
114	void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
115	int fd);
116	/* If need_defer is true, the implementation should guarantee that
117	* the to-be-put element is still alive before the bpf program, which
118	* may manipulate it, exists.
119	*/
120	void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
121	int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
122	u32 (*map_fd_sys_lookup_elem)(void *ptr);
123	void (*map_seq_show_elem)(struct bpf_map *map, void *key,
124	struct seq_file *m);
125	int (*map_check_btf)(const struct bpf_map *map,
126	const struct btf *btf,
127	const struct btf_type *key_type,
128	const struct btf_type *value_type);
129
130	/* Prog poke tracking helpers. */
131	int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
132	void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
133	void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
134	struct bpf_prog *new);
135
136	/* Direct value access helpers. */
137	int (*map_direct_value_addr)(const struct bpf_map *map,
138	u64 *imm, u32 off);
139	int (*map_direct_value_meta)(const struct bpf_map *map,
140	u64 imm, u32 *off);
141	int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
142	__poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
143	struct poll_table_struct *pts);
144	unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr,
145	unsigned long len, unsigned long pgoff,
146	unsigned long flags);
147
148	/* Functions called by bpf_local_storage maps */
149	int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
150	void *owner, u32 size);
151	void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
152	void *owner, u32 size);
153	struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
154
155	/* Misc helpers.*/
156	long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
157
158	/* map_meta_equal must be implemented for maps that can be
159	* used as an inner map. It is a runtime check to ensure
160	* an inner map can be inserted to an outer map.
161	*
162	* Some properties of the inner map has been used during the
163	* verification time. When inserting an inner map at the runtime,
164	* map_meta_equal has to ensure the inserting map has the same
165	* properties that the verifier has used earlier.
166	*/
167	bool (*map_meta_equal)(const struct bpf_map *meta0,
168	const struct bpf_map *meta1);
169
170
171	int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
172	struct bpf_func_state *caller,
173	struct bpf_func_state *callee);
174	long (*map_for_each_callback)(struct bpf_map *map,
175	bpf_callback_t callback_fn,
176	void *callback_ctx, u64 flags);
177
178	u64 (*map_mem_usage)(const struct bpf_map *map);
179
180	/* BTF id of struct allocated by map_alloc */
181	int *map_btf_id;
182
183	/* bpf_iter info used to open a seq_file */
184	const struct bpf_iter_seq_info *iter_seq_info;
185	};
186
187	enum {
188	/* Support at most 11 fields in a BTF type */
189	BTF_FIELDS_MAX = 11,
190	};
191
192	enum btf_field_type {
193	BPF_SPIN_LOCK = (1 << 0),
194	BPF_TIMER = (1 << 1),
195	BPF_KPTR_UNREF = (1 << 2),
196	BPF_KPTR_REF = (1 << 3),
197	BPF_KPTR_PERCPU = (1 << 4),
198	BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,
199	BPF_LIST_HEAD = (1 << 5),
200	BPF_LIST_NODE = (1 << 6),
201	BPF_RB_ROOT = (1 << 7),
202	BPF_RB_NODE = (1 << 8),
203	BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE,
204	BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD,
205	BPF_REFCOUNT = (1 << 9),
206	BPF_WORKQUEUE = (1 << 10),
207	BPF_UPTR = (1 << 11),
208	BPF_RES_SPIN_LOCK = (1 << 12),
209	};
210
211	typedef void (*btf_dtor_kfunc_t)(void *);
212
213	struct btf_field_kptr {
214	struct btf *btf;
215	struct module *module;
216	/* dtor used if btf_is_kernel(btf), otherwise the type is
217	* program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
218	*/
219	btf_dtor_kfunc_t dtor;
220	u32 btf_id;
221	};
222
223	struct btf_field_graph_root {
224	struct btf *btf;
225	u32 value_btf_id;
226	u32 node_offset;
227	struct btf_record *value_rec;
228	};
229
230	struct btf_field {
231	u32 offset;
232	u32 size;
233	enum btf_field_type type;
234	union {
235	struct btf_field_kptr kptr;
236	struct btf_field_graph_root graph_root;
237	};
238	};
239
240	struct btf_record {
241	u32 cnt;
242	u32 field_mask;
243	int spin_lock_off;
244	int res_spin_lock_off;
245	int timer_off;
246	int wq_off;
247	int refcount_off;
248	struct btf_field fields[];
249	};
250
251	/* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
252	struct bpf_rb_node_kern {
253	struct rb_node rb_node;
254	void *owner;
255	} __attribute__((aligned(8)));
256
257	/* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
258	struct bpf_list_node_kern {
259	struct list_head list_head;
260	void *owner;
261	} __attribute__((aligned(8)));
262
263	struct bpf_map {
264	const struct bpf_map_ops *ops;
265	struct bpf_map *inner_map_meta;
266	#ifdef CONFIG_SECURITY
267	void *security;
268	#endif
269	enum bpf_map_type map_type;
270	u32 key_size;
271	u32 value_size;
272	u32 max_entries;
273	u64 map_extra; /* any per-map-type extra fields */
274	u32 map_flags;
275	u32 id;
276	struct btf_record *record;
277	int numa_node;
278	u32 btf_key_type_id;
279	u32 btf_value_type_id;
280	u32 btf_vmlinux_value_type_id;
281	struct btf *btf;
282	#ifdef CONFIG_MEMCG
283	struct obj_cgroup *objcg;
284	#endif
285	char name[BPF_OBJ_NAME_LEN];
286	struct mutex freeze_mutex;
287	atomic64_t refcnt;
288	atomic64_t usercnt;
289	/* rcu is used before freeing and work is only used during freeing */
290	union {
291	struct work_struct work;
292	struct rcu_head rcu;
293	};
294	atomic64_t writecnt;
295	/* 'Ownership' of program-containing map is claimed by the first program
296	* that is going to use this map or by the first program which FD is
297	* stored in the map to make sure that all callers and callees have the
298	* same prog type, JITed flag and xdp_has_frags flag.
299	*/
300	struct {
301	const struct btf_type *attach_func_proto;
302	spinlock_t lock;
303	enum bpf_prog_type type;
304	bool jited;
305	bool xdp_has_frags;
306	} owner;
307	bool bypass_spec_v1;
308	bool frozen; /* write-once; write-protected by freeze_mutex */
309	bool free_after_mult_rcu_gp;
310	bool free_after_rcu_gp;
311	atomic64_t sleepable_refcnt;
312	s64 __percpu *elem_count;
313	};
314
315	static inline const char *btf_field_type_name(enum btf_field_type type)
316	{
317	switch (type) {
318	case BPF_SPIN_LOCK:
319	return "bpf_spin_lock";
320	case BPF_RES_SPIN_LOCK:
321	return "bpf_res_spin_lock";
322	case BPF_TIMER:
323	return "bpf_timer";
324	case BPF_WORKQUEUE:
325	return "bpf_wq";
326	case BPF_KPTR_UNREF:
327	case BPF_KPTR_REF:
328	return "kptr";
329	case BPF_KPTR_PERCPU:
330	return "percpu_kptr";
331	case BPF_UPTR:
332	return "uptr";
333	case BPF_LIST_HEAD:
334	return "bpf_list_head";
335	case BPF_LIST_NODE:
336	return "bpf_list_node";
337	case BPF_RB_ROOT:
338	return "bpf_rb_root";
339	case BPF_RB_NODE:
340	return "bpf_rb_node";
341	case BPF_REFCOUNT:
342	return "bpf_refcount";
343	default:
344	WARN_ON_ONCE(1);
345	return "unknown";
346	}
347	}
348
349	#if IS_ENABLED(CONFIG_DEBUG_KERNEL)
350	#define BPF_WARN_ONCE(cond, format...) WARN_ONCE(cond, format)
351	#else
352	#define BPF_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
353	#endif
354
355	static inline u32 btf_field_type_size(enum btf_field_type type)
356	{
357	switch (type) {
358	case BPF_SPIN_LOCK:
359	return sizeof(struct bpf_spin_lock);
360	case BPF_RES_SPIN_LOCK:
361	return sizeof(struct bpf_res_spin_lock);
362	case BPF_TIMER:
363	return sizeof(struct bpf_timer);
364	case BPF_WORKQUEUE:
365	return sizeof(struct bpf_wq);
366	case BPF_KPTR_UNREF:
367	case BPF_KPTR_REF:
368	case BPF_KPTR_PERCPU:
369	case BPF_UPTR:
370	return sizeof(u64);
371	case BPF_LIST_HEAD:
372	return sizeof(struct bpf_list_head);
373	case BPF_LIST_NODE:
374	return sizeof(struct bpf_list_node);
375	case BPF_RB_ROOT:
376	return sizeof(struct bpf_rb_root);
377	case BPF_RB_NODE:
378	return sizeof(struct bpf_rb_node);
379	case BPF_REFCOUNT:
380	return sizeof(struct bpf_refcount);
381	default:
382	WARN_ON_ONCE(1);
383	return 0;
384	}
385	}
386
387	static inline u32 btf_field_type_align(enum btf_field_type type)
388	{
389	switch (type) {
390	case BPF_SPIN_LOCK:
391	return __alignof__(struct bpf_spin_lock);
392	case BPF_RES_SPIN_LOCK:
393	return __alignof__(struct bpf_res_spin_lock);
394	case BPF_TIMER:
395	return __alignof__(struct bpf_timer);
396	case BPF_WORKQUEUE:
397	return __alignof__(struct bpf_wq);
398	case BPF_KPTR_UNREF:
399	case BPF_KPTR_REF:
400	case BPF_KPTR_PERCPU:
401	case BPF_UPTR:
402	return __alignof__(u64);
403	case BPF_LIST_HEAD:
404	return __alignof__(struct bpf_list_head);
405	case BPF_LIST_NODE:
406	return __alignof__(struct bpf_list_node);
407	case BPF_RB_ROOT:
408	return __alignof__(struct bpf_rb_root);
409	case BPF_RB_NODE:
410	return __alignof__(struct bpf_rb_node);
411	case BPF_REFCOUNT:
412	return __alignof__(struct bpf_refcount);
413	default:
414	WARN_ON_ONCE(1);
415	return 0;
416	}
417	}
418
419	static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
420	{
421	memset(addr, 0, field->size);
422
423	switch (field->type) {
424	case BPF_REFCOUNT:
425	refcount_set(r: (refcount_t *)addr, n: 1);
426	break;
427	case BPF_RB_NODE:
428	RB_CLEAR_NODE((struct rb_node *)addr);
429	break;
430	case BPF_LIST_HEAD:
431	case BPF_LIST_NODE:
432	INIT_LIST_HEAD(list: (struct list_head *)addr);
433	break;
434	case BPF_RB_ROOT:
435	/* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
436	case BPF_SPIN_LOCK:
437	case BPF_RES_SPIN_LOCK:
438	case BPF_TIMER:
439	case BPF_WORKQUEUE:
440	case BPF_KPTR_UNREF:
441	case BPF_KPTR_REF:
442	case BPF_KPTR_PERCPU:
443	case BPF_UPTR:
444	break;
445	default:
446	WARN_ON_ONCE(1);
447	return;
448	}
449	}
450
451	static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
452	{
453	if (IS_ERR_OR_NULL(ptr: rec))
454	return false;
455	return rec->field_mask & type;
456	}
457
458	static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
459	{
460	int i;
461
462	if (IS_ERR_OR_NULL(ptr: rec))
463	return;
464	for (i = 0; i < rec->cnt; i++)
465	bpf_obj_init_field(field: &rec->fields[i], addr: obj + rec->fields[i].offset);
466	}
467
468	/* 'dst' must be a temporary buffer and should not point to memory that is being
469	* used in parallel by a bpf program or bpf syscall, otherwise the access from
470	* the bpf program or bpf syscall may be corrupted by the reinitialization,
471	* leading to weird problems. Even 'dst' is newly-allocated from bpf memory
472	* allocator, it is still possible for 'dst' to be used in parallel by a bpf
473	* program or bpf syscall.
474	*/
475	static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
476	{
477	bpf_obj_init(rec: map->record, obj: dst);
478	}
479
480	/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
481	* forced to use 'long' read/writes to try to atomically copy long counters.
482	* Best-effort only. No barriers here, since it _will_ race with concurrent
483	* updates from BPF programs. Called from bpf syscall and mostly used with
484	* size 8 or 16 bytes, so ask compiler to inline it.
485	*/
486	static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
487	{
488	const long *lsrc = src;
489	long *ldst = dst;
490
491	size /= sizeof(long);
492	while (size--)
493	data_race(*ldst++ = *lsrc++);
494	}
495
496	/* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
497	static inline void bpf_obj_memcpy(struct btf_record *rec,
498	void *dst, void *src, u32 size,
499	bool long_memcpy)
500	{
501	u32 curr_off = 0;
502	int i;
503
504	if (IS_ERR_OR_NULL(ptr: rec)) {
505	if (long_memcpy)
506	bpf_long_memcpy(dst, src, round_up(size, 8));
507	else
508	memcpy(dst, src, size);
509	return;
510	}
511
512	for (i = 0; i < rec->cnt; i++) {
513	u32 next_off = rec->fields[i].offset;
514	u32 sz = next_off - curr_off;
515
516	memcpy(dst + curr_off, src + curr_off, sz);
517	curr_off += rec->fields[i].size + sz;
518	}
519	memcpy(dst + curr_off, src + curr_off, size - curr_off);
520	}
521
522	static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
523	{
524	bpf_obj_memcpy(rec: map->record, dst, src, size: map->value_size, long_memcpy: false);
525	}
526
527	static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
528	{
529	bpf_obj_memcpy(rec: map->record, dst, src, size: map->value_size, long_memcpy: true);
530	}
531
532	static inline void bpf_obj_swap_uptrs(const struct btf_record *rec, void *dst, void *src)
533	{
534	unsigned long *src_uptr, *dst_uptr;
535	const struct btf_field *field;
536	int i;
537
538	if (!btf_record_has_field(rec, type: BPF_UPTR))
539	return;
540
541	for (i = 0, field = rec->fields; i < rec->cnt; i++, field++) {
542	if (field->type != BPF_UPTR)
543	continue;
544
545	src_uptr = src + field->offset;
546	dst_uptr = dst + field->offset;
547	swap(*src_uptr, *dst_uptr);
548	}
549	}
550
551	static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
552	{
553	u32 curr_off = 0;
554	int i;
555
556	if (IS_ERR_OR_NULL(ptr: rec)) {
557	memset(dst, 0, size);
558	return;
559	}
560
561	for (i = 0; i < rec->cnt; i++) {
562	u32 next_off = rec->fields[i].offset;
563	u32 sz = next_off - curr_off;
564
565	memset(dst + curr_off, 0, sz);
566	curr_off += rec->fields[i].size + sz;
567	}
568	memset(dst + curr_off, 0, size - curr_off);
569	}
570
571	static inline void zero_map_value(struct bpf_map *map, void *dst)
572	{
573	bpf_obj_memzero(rec: map->record, dst, size: map->value_size);
574	}
575
576	void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
577	bool lock_src);
578	void bpf_timer_cancel_and_free(void *timer);
579	void bpf_wq_cancel_and_free(void *timer);
580	void bpf_list_head_free(const struct btf_field *field, void *list_head,
581	struct bpf_spin_lock *spin_lock);
582	void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
583	struct bpf_spin_lock *spin_lock);
584	u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena);
585	u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena);
586	int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
587
588	struct bpf_offload_dev;
589	struct bpf_offloaded_map;
590
591	struct bpf_map_dev_ops {
592	int (*map_get_next_key)(struct bpf_offloaded_map *map,
593	void *key, void *next_key);
594	int (*map_lookup_elem)(struct bpf_offloaded_map *map,
595	void *key, void *value);
596	int (*map_update_elem)(struct bpf_offloaded_map *map,
597	void *key, void *value, u64 flags);
598	int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
599	};
600
601	struct bpf_offloaded_map {
602	struct bpf_map map;
603	struct net_device *netdev;
604	const struct bpf_map_dev_ops *dev_ops;
605	void *dev_priv;
606	struct list_head offloads;
607	};
608
609	static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
610	{
611	return container_of(map, struct bpf_offloaded_map, map);
612	}
613
614	static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
615	{
616	return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
617	}
618
619	static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
620	{
621	return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
622	map->ops->map_seq_show_elem;
623	}
624
625	int map_check_no_btf(const struct bpf_map *map,
626	const struct btf *btf,
627	const struct btf_type *key_type,
628	const struct btf_type *value_type);
629
630	bool bpf_map_meta_equal(const struct bpf_map *meta0,
631	const struct bpf_map *meta1);
632
633	extern const struct bpf_map_ops bpf_map_offload_ops;
634
635	/* bpf_type_flag contains a set of flags that are applicable to the values of
636	* arg_type, ret_type and reg_type. For example, a pointer value may be null,
637	* or a memory is read-only. We classify types into two categories: base types
638	* and extended types. Extended types are base types combined with a type flag.
639	*
640	* Currently there are no more than 32 base types in arg_type, ret_type and
641	* reg_types.
642	*/
643	#define BPF_BASE_TYPE_BITS 8
644
645	enum bpf_type_flag {
646	/* PTR may be NULL. */
647	PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
648
649	/* MEM is read-only. When applied on bpf_arg, it indicates the arg is
650	* compatible with both mutable and immutable memory.
651	*/
652	MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
653
654	/* MEM points to BPF ring buffer reservation. */
655	MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
656
657	/* MEM is in user address space. */
658	MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
659
660	/* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
661	* with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
662	* order to drop this tag, it must be passed into bpf_per_cpu_ptr()
663	* or bpf_this_cpu_ptr(), which will return the pointer corresponding
664	* to the specified cpu.
665	*/
666	MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
667
668	/* Indicates that the argument will be released. */
669	OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
670
671	/* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
672	* unreferenced and referenced kptr loaded from map value using a load
673	* instruction, so that they can only be dereferenced but not escape the
674	* BPF program into the kernel (i.e. cannot be passed as arguments to
675	* kfunc or bpf helpers).
676	*/
677	PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
678
679	/* MEM can be uninitialized. */
680	MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
681
682	/* DYNPTR points to memory local to the bpf program. */
683	DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
684
685	/* DYNPTR points to a kernel-produced ringbuf record. */
686	DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
687
688	/* Size is known at compile time. */
689	MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
690
691	/* MEM is of an allocated object of type in program BTF. This is used to
692	* tag PTR_TO_BTF_ID allocated using bpf_obj_new.
693	*/
694	MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
695
696	/* PTR was passed from the kernel in a trusted context, and may be
697	* passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
698	* Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
699	* PTR_UNTRUSTED refers to a kptr that was read directly from a map
700	* without invoking bpf_kptr_xchg(). What we really need to know is
701	* whether a pointer is safe to pass to a kfunc or BPF helper function.
702	* While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
703	* helpers, they do not cover all possible instances of unsafe
704	* pointers. For example, a pointer that was obtained from walking a
705	* struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
706	* fact that it may be NULL, invalid, etc. This is due to backwards
707	* compatibility requirements, as this was the behavior that was first
708	* introduced when kptrs were added. The behavior is now considered
709	* deprecated, and PTR_UNTRUSTED will eventually be removed.
710	*
711	* PTR_TRUSTED, on the other hand, is a pointer that the kernel
712	* guarantees to be valid and safe to pass to kfuncs and BPF helpers.
713	* For example, pointers passed to tracepoint arguments are considered
714	* PTR_TRUSTED, as are pointers that are passed to struct_ops
715	* callbacks. As alluded to above, pointers that are obtained from
716	* walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
717	* struct task_struct *task is PTR_TRUSTED, then accessing
718	* task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
719	* in a BPF register. Similarly, pointers passed to certain programs
720	* types such as kretprobes are not guaranteed to be valid, as they may
721	* for example contain an object that was recently freed.
722	*/
723	PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
724
725	/* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
726	MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
727
728	/* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
729	* Currently only valid for linked-list and rbtree nodes. If the nodes
730	* have a bpf_refcount_field, they must be tagged MEM_RCU as well.
731	*/
732	NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
733
734	/* DYNPTR points to sk_buff */
735	DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
736
737	/* DYNPTR points to xdp_buff */
738	DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
739
740	/* Memory must be aligned on some architectures, used in combination with
741	* MEM_FIXED_SIZE.
742	*/
743	MEM_ALIGNED = BIT(17 + BPF_BASE_TYPE_BITS),
744
745	/* MEM is being written to, often combined with MEM_UNINIT. Non-presence
746	* of MEM_WRITE means that MEM is only being read. MEM_WRITE without the
747	* MEM_UNINIT means that memory needs to be initialized since it is also
748	* read.
749	*/
750	MEM_WRITE = BIT(18 + BPF_BASE_TYPE_BITS),
751
752	__BPF_TYPE_FLAG_MAX,
753	__BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
754	};
755
756	#define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
757	| DYNPTR_TYPE_XDP)
758
759	/* Max number of base types. */
760	#define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
761
762	/* Max number of all types. */
763	#define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
764
765	/* function argument constraints */
766	enum bpf_arg_type {
767	ARG_DONTCARE = 0, /* unused argument in helper function */
768
769	/* the following constraints used to prototype
770	* bpf_map_lookup/update/delete_elem() functions
771	*/
772	ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
773	ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
774	ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
775
776	/* Used to prototype bpf_memcmp() and other functions that access data
777	* on eBPF program stack
778	*/
779	ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
780	ARG_PTR_TO_ARENA,
781
782	ARG_CONST_SIZE, /* number of bytes accessed from memory */
783	ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
784
785	ARG_PTR_TO_CTX, /* pointer to context */
786	ARG_ANYTHING, /* any (initialized) argument is ok */
787	ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
788	ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
789	ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
790	ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
791	ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
792	ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
793	ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
794	ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
795	ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
796	ARG_PTR_TO_STACK, /* pointer to stack */
797	ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
798	ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
799	ARG_KPTR_XCHG_DEST, /* pointer to destination that kptrs are bpf_kptr_xchg'd into */
800	ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
801	__BPF_ARG_TYPE_MAX,
802
803	/* Extended arg_types. */
804	ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
805	ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
806	ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
807	ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
808	ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
809	ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
810	/* Pointer to memory does not need to be initialized, since helper function
811	* fills all bytes or clears them in error case.
812	*/
813	ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | MEM_WRITE | ARG_PTR_TO_MEM,
814	/* Pointer to valid memory of size known at compile time. */
815	ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
816
817	/* This must be the last entry. Its purpose is to ensure the enum is
818	* wide enough to hold the higher bits reserved for bpf_type_flag.
819	*/
820	__BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
821	};
822	static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
823
824	/* type of values returned from helper functions */
825	enum bpf_return_type {
826	RET_INTEGER, /* function returns integer */
827	RET_VOID, /* function doesn't return anything */
828	RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
829	RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
830	RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
831	RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
832	RET_PTR_TO_MEM, /* returns a pointer to memory */
833	RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
834	RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
835	__BPF_RET_TYPE_MAX,
836
837	/* Extended ret_types. */
838	RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
839	RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
840	RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
841	RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
842	RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
843	RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
844	RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
845	RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
846
847	/* This must be the last entry. Its purpose is to ensure the enum is
848	* wide enough to hold the higher bits reserved for bpf_type_flag.
849	*/
850	__BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
851	};
852	static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
853
854	/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
855	* to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
856	* instructions after verifying
857	*/
858	struct bpf_func_proto {
859	u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
860	bool gpl_only;
861	bool pkt_access;
862	bool might_sleep;
863	/* set to true if helper follows contract for llvm
864	* attribute bpf_fastcall:
865	* - void functions do not scratch r0
866	* - functions taking N arguments scratch only registers r1-rN
867	*/
868	bool allow_fastcall;
869	enum bpf_return_type ret_type;
870	union {
871	struct {
872	enum bpf_arg_type arg1_type;
873	enum bpf_arg_type arg2_type;
874	enum bpf_arg_type arg3_type;
875	enum bpf_arg_type arg4_type;
876	enum bpf_arg_type arg5_type;
877	};
878	enum bpf_arg_type arg_type[5];
879	};
880	union {
881	struct {
882	u32 *arg1_btf_id;
883	u32 *arg2_btf_id;
884	u32 *arg3_btf_id;
885	u32 *arg4_btf_id;
886	u32 *arg5_btf_id;
887	};
888	u32 *arg_btf_id[5];
889	struct {
890	size_t arg1_size;
891	size_t arg2_size;
892	size_t arg3_size;
893	size_t arg4_size;
894	size_t arg5_size;
895	};
896	size_t arg_size[5];
897	};
898	int *ret_btf_id; /* return value btf_id */
899	bool (*allowed)(const struct bpf_prog *prog);
900	};
901
902	/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
903	* the first argument to eBPF programs.
904	* For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
905	*/
906	struct bpf_context;
907
908	enum bpf_access_type {
909	BPF_READ = 1,
910	BPF_WRITE = 2
911	};
912
913	/* types of values stored in eBPF registers */
914	/* Pointer types represent:
915	* pointer
916	* pointer + imm
917	* pointer + (u16) var
918	* pointer + (u16) var + imm
919	* if (range > 0) then [ptr, ptr + range - off) is safe to access
920	* if (id > 0) means that some 'var' was added
921	* if (off > 0) means that 'imm' was added
922	*/
923	enum bpf_reg_type {
924	NOT_INIT = 0, /* nothing was written into register */
925	SCALAR_VALUE, /* reg doesn't contain a valid pointer */
926	PTR_TO_CTX, /* reg points to bpf_context */
927	CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
928	PTR_TO_MAP_VALUE, /* reg points to map element value */
929	PTR_TO_MAP_KEY, /* reg points to a map element key */
930	PTR_TO_STACK, /* reg == frame_pointer + offset */
931	PTR_TO_PACKET_META, /* skb->data - meta_len */
932	PTR_TO_PACKET, /* reg points to skb->data */
933	PTR_TO_PACKET_END, /* skb->data + headlen */
934	PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
935	PTR_TO_SOCKET, /* reg points to struct bpf_sock */
936	PTR_TO_SOCK_COMMON, /* reg points to sock_common */
937	PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
938	PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
939	PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
940	/* PTR_TO_BTF_ID points to a kernel struct that does not need
941	* to be null checked by the BPF program. This does not imply the
942	* pointer is _not_ null and in practice this can easily be a null
943	* pointer when reading pointer chains. The assumption is program
944	* context will handle null pointer dereference typically via fault
945	* handling. The verifier must keep this in mind and can make no
946	* assumptions about null or non-null when doing branch analysis.
947	* Further, when passed into helpers the helpers can not, without
948	* additional context, assume the value is non-null.
949	*/
950	PTR_TO_BTF_ID,
951	PTR_TO_MEM, /* reg points to valid memory region */
952	PTR_TO_ARENA,
953	PTR_TO_BUF, /* reg points to a read/write buffer */
954	PTR_TO_FUNC, /* reg points to a bpf program function */
955	CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
956	__BPF_REG_TYPE_MAX,
957
958	/* Extended reg_types. */
959	PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
960	PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
961	PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
962	PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
963	/* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
964	* been checked for null. Used primarily to inform the verifier
965	* an explicit null check is required for this struct.
966	*/
967	PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
968
969	/* This must be the last entry. Its purpose is to ensure the enum is
970	* wide enough to hold the higher bits reserved for bpf_type_flag.
971	*/
972	__BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
973	};
974	static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
975
976	/* The information passed from prog-specific *_is_valid_access
977	* back to the verifier.
978	*/
979	struct bpf_insn_access_aux {
980	enum bpf_reg_type reg_type;
981	bool is_ldsx;
982	union {
983	int ctx_field_size;
984	struct {
985	struct btf *btf;
986	u32 btf_id;
987	u32 ref_obj_id;
988	};
989	};
990	struct bpf_verifier_log *log; /* for verbose logs */
991	bool is_retval; /* is accessing function return value ? */
992	};
993
994	static inline void
995	bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
996	{
997	aux->ctx_field_size = size;
998	}
999
1000	static bool bpf_is_ldimm64(const struct bpf_insn *insn)
1001	{
1002	return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
1003	}
1004
1005	static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
1006	{
1007	return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
1008	}
1009
1010	/* Given a BPF_ATOMIC instruction @atomic_insn, return true if it is an
1011	* atomic load or store, and false if it is a read-modify-write instruction.
1012	*/
1013	static inline bool
1014	bpf_atomic_is_load_store(const struct bpf_insn *atomic_insn)
1015	{
1016	switch (atomic_insn->imm) {
1017	case BPF_LOAD_ACQ:
1018	case BPF_STORE_REL:
1019	return true;
1020	default:
1021	return false;
1022	}
1023	}
1024
1025	struct bpf_prog_ops {
1026	int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
1027	union bpf_attr __user *uattr);
1028	};
1029
1030	struct bpf_reg_state;
1031	struct bpf_verifier_ops {
1032	/* return eBPF function prototype for verification */
1033	const struct bpf_func_proto *
1034	(*get_func_proto)(enum bpf_func_id func_id,
1035	const struct bpf_prog *prog);
1036
1037	/* return true if 'size' wide access at offset 'off' within bpf_context
1038	* with 'type' (read or write) is allowed
1039	*/
1040	bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
1041	const struct bpf_prog *prog,
1042	struct bpf_insn_access_aux *info);
1043	int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
1044	const struct bpf_prog *prog);
1045	int (*gen_epilogue)(struct bpf_insn *insn, const struct bpf_prog *prog,
1046	s16 ctx_stack_off);
1047	int (*gen_ld_abs)(const struct bpf_insn *orig,
1048	struct bpf_insn *insn_buf);
1049	u32 (*convert_ctx_access)(enum bpf_access_type type,
1050	const struct bpf_insn *src,
1051	struct bpf_insn *dst,
1052	struct bpf_prog *prog, u32 *target_size);
1053	int (*btf_struct_access)(struct bpf_verifier_log *log,
1054	const struct bpf_reg_state *reg,
1055	int off, int size);
1056	};
1057
1058	struct bpf_prog_offload_ops {
1059	/* verifier basic callbacks */
1060	int (*insn_hook)(struct bpf_verifier_env *env,
1061	int insn_idx, int prev_insn_idx);
1062	int (*finalize)(struct bpf_verifier_env *env);
1063	/* verifier optimization callbacks (called after .finalize) */
1064	int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
1065	struct bpf_insn *insn);
1066	int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
1067	/* program management callbacks */
1068	int (*prepare)(struct bpf_prog *prog);
1069	int (*translate)(struct bpf_prog *prog);
1070	void (*destroy)(struct bpf_prog *prog);
1071	};
1072
1073	struct bpf_prog_offload {
1074	struct bpf_prog *prog;
1075	struct net_device *netdev;
1076	struct bpf_offload_dev *offdev;
1077	void *dev_priv;
1078	struct list_head offloads;
1079	bool dev_state;
1080	bool opt_failed;
1081	void *jited_image;
1082	u32 jited_len;
1083	};
1084
1085	enum bpf_cgroup_storage_type {
1086	BPF_CGROUP_STORAGE_SHARED,
1087	BPF_CGROUP_STORAGE_PERCPU,
1088	__BPF_CGROUP_STORAGE_MAX
1089	};
1090
1091	#define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
1092
1093	/* The longest tracepoint has 12 args.
1094	* See include/trace/bpf_probe.h
1095	*/
1096	#define MAX_BPF_FUNC_ARGS 12
1097
1098	/* The maximum number of arguments passed through registers
1099	* a single function may have.
1100	*/
1101	#define MAX_BPF_FUNC_REG_ARGS 5
1102
1103	/* The argument is a structure. */
1104	#define BTF_FMODEL_STRUCT_ARG BIT(0)
1105
1106	/* The argument is signed. */
1107	#define BTF_FMODEL_SIGNED_ARG BIT(1)
1108
1109	struct btf_func_model {
1110	u8 ret_size;
1111	u8 ret_flags;
1112	u8 nr_args;
1113	u8 arg_size[MAX_BPF_FUNC_ARGS];
1114	u8 arg_flags[MAX_BPF_FUNC_ARGS];
1115	};
1116
1117	/* Restore arguments before returning from trampoline to let original function
1118	* continue executing. This flag is used for fentry progs when there are no
1119	* fexit progs.
1120	*/
1121	#define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1122	/* Call original function after fentry progs, but before fexit progs.
1123	* Makes sense for fentry/fexit, normal calls and indirect calls.
1124	*/
1125	#define BPF_TRAMP_F_CALL_ORIG BIT(1)
1126	/* Skip current frame and return to parent. Makes sense for fentry/fexit
1127	* programs only. Should not be used with normal calls and indirect calls.
1128	*/
1129	#define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1130	/* Store IP address of the caller on the trampoline stack,
1131	* so it's available for trampoline's programs.
1132	*/
1133	#define BPF_TRAMP_F_IP_ARG BIT(3)
1134	/* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1135	#define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1136
1137	/* Get original function from stack instead of from provided direct address.
1138	* Makes sense for trampolines with fexit or fmod_ret programs.
1139	*/
1140	#define BPF_TRAMP_F_ORIG_STACK BIT(5)
1141
1142	/* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1143	* e.g., a live patch. This flag is set and cleared by ftrace call backs,
1144	*/
1145	#define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1146
1147	/* Indicate that current trampoline is in a tail call context. Then, it has to
1148	* cache and restore tail_call_cnt to avoid infinite tail call loop.
1149	*/
1150	#define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1151
1152	/*
1153	* Indicate the trampoline should be suitable to receive indirect calls;
1154	* without this indirectly calling the generated code can result in #UD/#CP,
1155	* depending on the CFI options.
1156	*
1157	* Used by bpf_struct_ops.
1158	*
1159	* Incompatible with FENTRY usage, overloads @func_addr argument.
1160	*/
1161	#define BPF_TRAMP_F_INDIRECT BIT(8)
1162
1163	/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1164	* bytes on x86.
1165	*/
1166	enum {
1167	#if defined(__s390x__)
1168	BPF_MAX_TRAMP_LINKS = 27,
1169	#else
1170	BPF_MAX_TRAMP_LINKS = 38,
1171	#endif
1172	};
1173
1174	struct bpf_tramp_links {
1175	struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1176	int nr_links;
1177	};
1178
1179	struct bpf_tramp_run_ctx;
1180
1181	/* Different use cases for BPF trampoline:
1182	* 1. replace nop at the function entry (kprobe equivalent)
1183	* flags = BPF_TRAMP_F_RESTORE_REGS
1184	* fentry = a set of programs to run before returning from trampoline
1185	*
1186	* 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1187	* flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1188	* orig_call = fentry_ip + MCOUNT_INSN_SIZE
1189	* fentry = a set of program to run before calling original function
1190	* fexit = a set of program to run after original function
1191	*
1192	* 3. replace direct call instruction anywhere in the function body
1193	* or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1194	* With flags = 0
1195	* fentry = a set of programs to run before returning from trampoline
1196	* With flags = BPF_TRAMP_F_CALL_ORIG
1197	* orig_call = original callback addr or direct function addr
1198	* fentry = a set of program to run before calling original function
1199	* fexit = a set of program to run after original function
1200	*/
1201	struct bpf_tramp_image;
1202	int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,
1203	const struct btf_func_model *m, u32 flags,
1204	struct bpf_tramp_links *tlinks,
1205	void *func_addr);
1206	void *arch_alloc_bpf_trampoline(unsigned int size);
1207	void arch_free_bpf_trampoline(void *image, unsigned int size);
1208	int __must_check arch_protect_bpf_trampoline(void *image, unsigned int size);
1209	int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
1210	struct bpf_tramp_links *tlinks, void *func_addr);
1211
1212	u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1213	struct bpf_tramp_run_ctx *run_ctx);
1214	void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1215	struct bpf_tramp_run_ctx *run_ctx);
1216	void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1217	void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1218	typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1219	struct bpf_tramp_run_ctx *run_ctx);
1220	typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1221	struct bpf_tramp_run_ctx *run_ctx);
1222	bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1223	bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1224
1225	struct bpf_ksym {
1226	unsigned long start;
1227	unsigned long end;
1228	char name[KSYM_NAME_LEN];
1229	struct list_head lnode;
1230	struct latch_tree_node tnode;
1231	bool prog;
1232	};
1233
1234	enum bpf_tramp_prog_type {
1235	BPF_TRAMP_FENTRY,
1236	BPF_TRAMP_FEXIT,
1237	BPF_TRAMP_MODIFY_RETURN,
1238	BPF_TRAMP_MAX,
1239	BPF_TRAMP_REPLACE, /* more than MAX */
1240	};
1241
1242	struct bpf_tramp_image {
1243	void *image;
1244	int size;
1245	struct bpf_ksym ksym;
1246	struct percpu_ref pcref;
1247	void *ip_after_call;
1248	void *ip_epilogue;
1249	union {
1250	struct rcu_head rcu;
1251	struct work_struct work;
1252	};
1253	};
1254
1255	struct bpf_trampoline {
1256	/* hlist for trampoline_table */
1257	struct hlist_node hlist;
1258	struct ftrace_ops *fops;
1259	/* serializes access to fields of this trampoline */
1260	struct mutex mutex;
1261	refcount_t refcnt;
1262	u32 flags;
1263	u64 key;
1264	struct {
1265	struct btf_func_model model;
1266	void *addr;
1267	bool ftrace_managed;
1268	} func;
1269	/* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1270	* program by replacing one of its functions. func.addr is the address
1271	* of the function it replaced.
1272	*/
1273	struct bpf_prog *extension_prog;
1274	/* list of BPF programs using this trampoline */
1275	struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1276	/* Number of attached programs. A counter per kind. */
1277	int progs_cnt[BPF_TRAMP_MAX];
1278	/* Executable image of trampoline */
1279	struct bpf_tramp_image *cur_image;
1280	};
1281
1282	struct bpf_attach_target_info {
1283	struct btf_func_model fmodel;
1284	long tgt_addr;
1285	struct module *tgt_mod;
1286	const char *tgt_name;
1287	const struct btf_type *tgt_type;
1288	};
1289
1290	#define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1291
1292	struct bpf_dispatcher_prog {
1293	struct bpf_prog *prog;
1294	refcount_t users;
1295	};
1296
1297	struct bpf_dispatcher {
1298	/* dispatcher mutex */
1299	struct mutex mutex;
1300	void *func;
1301	struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1302	int num_progs;
1303	void *image;
1304	void *rw_image;
1305	u32 image_off;
1306	struct bpf_ksym ksym;
1307	#ifdef CONFIG_HAVE_STATIC_CALL
1308	struct static_call_key *sc_key;
1309	void *sc_tramp;
1310	#endif
1311	};
1312
1313	#ifndef __bpfcall
1314	#define __bpfcall __nocfi
1315	#endif
1316
1317	static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func(
1318	const void *ctx,
1319	const struct bpf_insn *insnsi,
1320	bpf_func_t bpf_func)
1321	{
1322	return bpf_func(ctx, insnsi);
1323	}
1324
1325	/* the implementation of the opaque uapi struct bpf_dynptr */
1326	struct bpf_dynptr_kern {
1327	void *data;
1328	/* Size represents the number of usable bytes of dynptr data.
1329	* If for example the offset is at 4 for a local dynptr whose data is
1330	* of type u64, the number of usable bytes is 4.
1331	*
1332	* The upper 8 bits are reserved. It is as follows:
1333	* Bits 0 - 23 = size
1334	* Bits 24 - 30 = dynptr type
1335	* Bit 31 = whether dynptr is read-only
1336	*/
1337	u32 size;
1338	u32 offset;
1339	} __aligned(8);
1340
1341	enum bpf_dynptr_type {
1342	BPF_DYNPTR_TYPE_INVALID,
1343	/* Points to memory that is local to the bpf program */
1344	BPF_DYNPTR_TYPE_LOCAL,
1345	/* Underlying data is a ringbuf record */
1346	BPF_DYNPTR_TYPE_RINGBUF,
1347	/* Underlying data is a sk_buff */
1348	BPF_DYNPTR_TYPE_SKB,
1349	/* Underlying data is a xdp_buff */
1350	BPF_DYNPTR_TYPE_XDP,
1351	};
1352
1353	int bpf_dynptr_check_size(u32 size);
1354	u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1355	const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
1356	void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
1357	bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
1358	int __bpf_dynptr_write(const struct bpf_dynptr_kern *dst, u32 offset,
1359	void *src, u32 len, u64 flags);
1360	void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *p, u32 offset,
1361	void *buffer__opt, u32 buffer__szk);
1362
1363	static inline int bpf_dynptr_check_off_len(const struct bpf_dynptr_kern *ptr, u32 offset, u32 len)
1364	{
1365	u32 size = __bpf_dynptr_size(ptr);
1366
1367	if (len > size || offset > size - len)
1368	return -E2BIG;
1369
1370	return 0;
1371	}
1372
1373	#ifdef CONFIG_BPF_JIT
1374	int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1375	struct bpf_trampoline *tr,
1376	struct bpf_prog *tgt_prog);
1377	int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1378	struct bpf_trampoline *tr,
1379	struct bpf_prog *tgt_prog);
1380	struct bpf_trampoline *bpf_trampoline_get(u64 key,
1381	struct bpf_attach_target_info *tgt_info);
1382	void bpf_trampoline_put(struct bpf_trampoline *tr);
1383	int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1384
1385	/*
1386	* When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1387	* indirection with a direct call to the bpf program. If the architecture does
1388	* not have STATIC_CALL, avoid a double-indirection.
1389	*/
1390	#ifdef CONFIG_HAVE_STATIC_CALL
1391
1392	#define __BPF_DISPATCHER_SC_INIT(_name) \
1393	.sc_key = &STATIC_CALL_KEY(_name), \
1394	.sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1395
1396	#define __BPF_DISPATCHER_SC(name) \
1397	DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1398
1399	#define __BPF_DISPATCHER_CALL(name) \
1400	static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1401
1402	#define __BPF_DISPATCHER_UPDATE(_d, _new) \
1403	__static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1404
1405	#else
1406	#define __BPF_DISPATCHER_SC_INIT(name)
1407	#define __BPF_DISPATCHER_SC(name)
1408	#define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1409	#define __BPF_DISPATCHER_UPDATE(_d, _new)
1410	#endif
1411
1412	#define BPF_DISPATCHER_INIT(_name) { \
1413	.mutex = __MUTEX_INITIALIZER(_name.mutex), \
1414	.func = &_name##_func, \
1415	.progs = {}, \
1416	.num_progs = 0, \
1417	.image = NULL, \
1418	.image_off = 0, \
1419	.ksym = { \
1420	.name = #_name, \
1421	.lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1422	}, \
1423	__BPF_DISPATCHER_SC_INIT(_name##_call) \
1424	}
1425
1426	#define DEFINE_BPF_DISPATCHER(name) \
1427	__BPF_DISPATCHER_SC(name); \
1428	noinline __bpfcall unsigned int bpf_dispatcher_##name##_func( \
1429	const void *ctx, \
1430	const struct bpf_insn *insnsi, \
1431	bpf_func_t bpf_func) \
1432	{ \
1433	return __BPF_DISPATCHER_CALL(name); \
1434	} \
1435	EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1436	struct bpf_dispatcher bpf_dispatcher_##name = \
1437	BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1438
1439	#define DECLARE_BPF_DISPATCHER(name) \
1440	unsigned int bpf_dispatcher_##name##_func( \
1441	const void *ctx, \
1442	const struct bpf_insn *insnsi, \
1443	bpf_func_t bpf_func); \
1444	extern struct bpf_dispatcher bpf_dispatcher_##name;
1445
1446	#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1447	#define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1448	void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1449	struct bpf_prog *to);
1450	/* Called only from JIT-enabled code, so there's no need for stubs. */
1451	void bpf_image_ksym_init(void *data, unsigned int size, struct bpf_ksym *ksym);
1452	void bpf_image_ksym_add(struct bpf_ksym *ksym);
1453	void bpf_image_ksym_del(struct bpf_ksym *ksym);
1454	void bpf_ksym_add(struct bpf_ksym *ksym);
1455	void bpf_ksym_del(struct bpf_ksym *ksym);
1456	int bpf_jit_charge_modmem(u32 size);
1457	void bpf_jit_uncharge_modmem(u32 size);
1458	bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1459	#else
1460	static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1461	struct bpf_trampoline *tr,
1462	struct bpf_prog *tgt_prog)
1463	{
1464	return -ENOTSUPP;
1465	}
1466	static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1467	struct bpf_trampoline *tr,
1468	struct bpf_prog *tgt_prog)
1469	{
1470	return -ENOTSUPP;
1471	}
1472	static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1473	struct bpf_attach_target_info *tgt_info)
1474	{
1475	return NULL;
1476	}
1477	static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1478	#define DEFINE_BPF_DISPATCHER(name)
1479	#define DECLARE_BPF_DISPATCHER(name)
1480	#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1481	#define BPF_DISPATCHER_PTR(name) NULL
1482	static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1483	struct bpf_prog *from,
1484	struct bpf_prog *to) {}
1485	static inline bool is_bpf_image_address(unsigned long address)
1486	{
1487	return false;
1488	}
1489	static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1490	{
1491	return false;
1492	}
1493	#endif
1494
1495	struct bpf_func_info_aux {
1496	u16 linkage;
1497	bool unreliable;
1498	bool called : 1;
1499	bool verified : 1;
1500	};
1501
1502	enum bpf_jit_poke_reason {
1503	BPF_POKE_REASON_TAIL_CALL,
1504	};
1505
1506	/* Descriptor of pokes pointing /into/ the JITed image. */
1507	struct bpf_jit_poke_descriptor {
1508	void *tailcall_target;
1509	void *tailcall_bypass;
1510	void *bypass_addr;
1511	void *aux;
1512	union {
1513	struct {
1514	struct bpf_map *map;
1515	u32 key;
1516	} tail_call;
1517	};
1518	bool tailcall_target_stable;
1519	u8 adj_off;
1520	u16 reason;
1521	u32 insn_idx;
1522	};
1523
1524	/* reg_type info for ctx arguments */
1525	struct bpf_ctx_arg_aux {
1526	u32 offset;
1527	enum bpf_reg_type reg_type;
1528	struct btf *btf;
1529	u32 btf_id;
1530	u32 ref_obj_id;
1531	bool refcounted;
1532	};
1533
1534	struct btf_mod_pair {
1535	struct btf *btf;
1536	struct module *module;
1537	};
1538
1539	struct bpf_kfunc_desc_tab;
1540
1541	struct bpf_prog_aux {
1542	atomic64_t refcnt;
1543	u32 used_map_cnt;
1544	u32 used_btf_cnt;
1545	u32 max_ctx_offset;
1546	u32 max_pkt_offset;
1547	u32 max_tp_access;
1548	u32 stack_depth;
1549	u32 id;
1550	u32 func_cnt; /* used by non-func prog as the number of func progs */
1551	u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */
1552	u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1553	u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1554	u32 attach_st_ops_member_off;
1555	u32 ctx_arg_info_size;
1556	u32 max_rdonly_access;
1557	u32 max_rdwr_access;
1558	struct btf *attach_btf;
1559	struct bpf_ctx_arg_aux *ctx_arg_info;
1560	void __percpu *priv_stack_ptr;
1561	struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1562	struct bpf_prog *dst_prog;
1563	struct bpf_trampoline *dst_trampoline;
1564	enum bpf_prog_type saved_dst_prog_type;
1565	enum bpf_attach_type saved_dst_attach_type;
1566	bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1567	bool dev_bound; /* Program is bound to the netdev. */
1568	bool offload_requested; /* Program is bound and offloaded to the netdev. */
1569	bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1570	bool attach_tracing_prog; /* true if tracing another tracing program */
1571	bool func_proto_unreliable;
1572	bool tail_call_reachable;
1573	bool xdp_has_frags;
1574	bool exception_cb;
1575	bool exception_boundary;
1576	bool is_extended; /* true if extended by freplace program */
1577	bool jits_use_priv_stack;
1578	bool priv_stack_requested;
1579	bool changes_pkt_data;
1580	bool might_sleep;
1581	u64 prog_array_member_cnt; /* counts how many times as member of prog_array */
1582	struct mutex ext_mutex; /* mutex for is_extended and prog_array_member_cnt */
1583	struct bpf_arena *arena;
1584	void (*recursion_detected)(struct bpf_prog *prog); /* callback if recursion is detected */
1585	/* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1586	const struct btf_type *attach_func_proto;
1587	/* function name for valid attach_btf_id */
1588	const char *attach_func_name;
1589	struct bpf_prog **func;
1590	void *jit_data; /* JIT specific data. arch dependent */
1591	struct bpf_jit_poke_descriptor *poke_tab;
1592	struct bpf_kfunc_desc_tab *kfunc_tab;
1593	struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1594	u32 size_poke_tab;
1595	#ifdef CONFIG_FINEIBT
1596	struct bpf_ksym ksym_prefix;
1597	#endif
1598	struct bpf_ksym ksym;
1599	const struct bpf_prog_ops *ops;
1600	const struct bpf_struct_ops *st_ops;
1601	struct bpf_map **used_maps;
1602	struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1603	struct btf_mod_pair *used_btfs;
1604	struct bpf_prog *prog;
1605	struct user_struct *user;
1606	u64 load_time; /* ns since boottime */
1607	u32 verified_insns;
1608	int cgroup_atype; /* enum cgroup_bpf_attach_type */
1609	struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1610	char name[BPF_OBJ_NAME_LEN];
1611	u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64);
1612	#ifdef CONFIG_SECURITY
1613	void *security;
1614	#endif
1615	struct bpf_token *token;
1616	struct bpf_prog_offload *offload;
1617	struct btf *btf;
1618	struct bpf_func_info *func_info;
1619	struct bpf_func_info_aux *func_info_aux;
1620	/* bpf_line_info loaded from userspace. linfo->insn_off
1621	* has the xlated insn offset.
1622	* Both the main and sub prog share the same linfo.
1623	* The subprog can access its first linfo by
1624	* using the linfo_idx.
1625	*/
1626	struct bpf_line_info *linfo;
1627	/* jited_linfo is the jited addr of the linfo. It has a
1628	* one to one mapping to linfo:
1629	* jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1630	* Both the main and sub prog share the same jited_linfo.
1631	* The subprog can access its first jited_linfo by
1632	* using the linfo_idx.
1633	*/
1634	void **jited_linfo;
1635	u32 func_info_cnt;
1636	u32 nr_linfo;
1637	/* subprog can use linfo_idx to access its first linfo and
1638	* jited_linfo.
1639	* main prog always has linfo_idx == 0
1640	*/
1641	u32 linfo_idx;
1642	struct module *mod;
1643	u32 num_exentries;
1644	struct exception_table_entry *extable;
1645	union {
1646	struct work_struct work;
1647	struct rcu_head rcu;
1648	};
1649	};
1650
1651	struct bpf_prog {
1652	u16 pages; /* Number of allocated pages */
1653	u16 jited:1, /* Is our filter JIT'ed? */
1654	jit_requested:1,/* archs need to JIT the prog */
1655	gpl_compatible:1, /* Is filter GPL compatible? */
1656	cb_access:1, /* Is control block accessed? */
1657	dst_needed:1, /* Do we need dst entry? */
1658	blinding_requested:1, /* needs constant blinding */
1659	blinded:1, /* Was blinded */
1660	is_func:1, /* program is a bpf function */
1661	kprobe_override:1, /* Do we override a kprobe? */
1662	has_callchain_buf:1, /* callchain buffer allocated? */
1663	enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1664	call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1665	call_get_func_ip:1, /* Do we call get_func_ip() */
1666	tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */
1667	sleepable:1; /* BPF program is sleepable */
1668	enum bpf_prog_type type; /* Type of BPF program */
1669	enum bpf_attach_type expected_attach_type; /* For some prog types */
1670	u32 len; /* Number of filter blocks */
1671	u32 jited_len; /* Size of jited insns in bytes */
1672	u8 tag[BPF_TAG_SIZE];
1673	struct bpf_prog_stats __percpu *stats;
1674	int __percpu *active;
1675	unsigned int (*bpf_func)(const void *ctx,
1676	const struct bpf_insn *insn);
1677	struct bpf_prog_aux *aux; /* Auxiliary fields */
1678	struct sock_fprog_kern *orig_prog; /* Original BPF program */
1679	/* Instructions for interpreter */
1680	union {
1681	DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1682	DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1683	};
1684	};
1685
1686	struct bpf_array_aux {
1687	/* Programs with direct jumps into programs part of this array. */
1688	struct list_head poke_progs;
1689	struct bpf_map *map;
1690	struct mutex poke_mutex;
1691	struct work_struct work;
1692	};
1693
1694	struct bpf_link {
1695	atomic64_t refcnt;
1696	u32 id;
1697	enum bpf_link_type type;
1698	const struct bpf_link_ops *ops;
1699	struct bpf_prog *prog;
1700	/* whether BPF link itself has "sleepable" semantics, which can differ
1701	* from underlying BPF program having a "sleepable" semantics, as BPF
1702	* link's semantics is determined by target attach hook
1703	*/
1704	bool sleepable;
1705	/* rcu is used before freeing, work can be used to schedule that
1706	* RCU-based freeing before that, so they never overlap
1707	*/
1708	union {
1709	struct rcu_head rcu;
1710	struct work_struct work;
1711	};
1712	};
1713
1714	struct bpf_link_ops {
1715	void (*release)(struct bpf_link *link);
1716	/* deallocate link resources callback, called without RCU grace period
1717	* waiting
1718	*/
1719	void (*dealloc)(struct bpf_link *link);
1720	/* deallocate link resources callback, called after RCU grace period;
1721	* if either the underlying BPF program is sleepable or BPF link's
1722	* target hook is sleepable, we'll go through tasks trace RCU GP and
1723	* then "classic" RCU GP; this need for chaining tasks trace and
1724	* classic RCU GPs is designated by setting bpf_link->sleepable flag
1725	*/
1726	void (*dealloc_deferred)(struct bpf_link *link);
1727	int (*detach)(struct bpf_link *link);
1728	int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1729	struct bpf_prog *old_prog);
1730	void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1731	int (*fill_link_info)(const struct bpf_link *link,
1732	struct bpf_link_info *info);
1733	int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1734	struct bpf_map *old_map);
1735	__poll_t (*poll)(struct file *file, struct poll_table_struct *pts);
1736	};
1737
1738	struct bpf_tramp_link {
1739	struct bpf_link link;
1740	struct hlist_node tramp_hlist;
1741	u64 cookie;
1742	};
1743
1744	struct bpf_shim_tramp_link {
1745	struct bpf_tramp_link link;
1746	struct bpf_trampoline *trampoline;
1747	};
1748
1749	struct bpf_tracing_link {
1750	struct bpf_tramp_link link;
1751	enum bpf_attach_type attach_type;
1752	struct bpf_trampoline *trampoline;
1753	struct bpf_prog *tgt_prog;
1754	};
1755
1756	struct bpf_raw_tp_link {
1757	struct bpf_link link;
1758	struct bpf_raw_event_map *btp;
1759	u64 cookie;
1760	};
1761
1762	struct bpf_link_primer {
1763	struct bpf_link *link;
1764	struct file *file;
1765	int fd;
1766	u32 id;
1767	};
1768
1769	struct bpf_mount_opts {
1770	kuid_t uid;
1771	kgid_t gid;
1772	umode_t mode;
1773
1774	/* BPF token-related delegation options */
1775	u64 delegate_cmds;
1776	u64 delegate_maps;
1777	u64 delegate_progs;
1778	u64 delegate_attachs;
1779	};
1780
1781	struct bpf_token {
1782	struct work_struct work;
1783	atomic64_t refcnt;
1784	struct user_namespace *userns;
1785	u64 allowed_cmds;
1786	u64 allowed_maps;
1787	u64 allowed_progs;
1788	u64 allowed_attachs;
1789	#ifdef CONFIG_SECURITY
1790	void *security;
1791	#endif
1792	};
1793
1794	struct bpf_struct_ops_value;
1795	struct btf_member;
1796
1797	#define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1798	/**
1799	* struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1800	* define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1801	* of BPF_PROG_TYPE_STRUCT_OPS progs.
1802	* @verifier_ops: A structure of callbacks that are invoked by the verifier
1803	* when determining whether the struct_ops progs in the
1804	* struct_ops map are valid.
1805	* @init: A callback that is invoked a single time, and before any other
1806	* callback, to initialize the structure. A nonzero return value means
1807	* the subsystem could not be initialized.
1808	* @check_member: When defined, a callback invoked by the verifier to allow
1809	* the subsystem to determine if an entry in the struct_ops map
1810	* is valid. A nonzero return value means that the map is
1811	* invalid and should be rejected by the verifier.
1812	* @init_member: A callback that is invoked for each member of the struct_ops
1813	* map to allow the subsystem to initialize the member. A nonzero
1814	* value means the member could not be initialized. This callback
1815	* is exclusive with the @type, @type_id, @value_type, and
1816	* @value_id fields.
1817	* @reg: A callback that is invoked when the struct_ops map has been
1818	* initialized and is being attached to. Zero means the struct_ops map
1819	* has been successfully registered and is live. A nonzero return value
1820	* means the struct_ops map could not be registered.
1821	* @unreg: A callback that is invoked when the struct_ops map should be
1822	* unregistered.
1823	* @update: A callback that is invoked when the live struct_ops map is being
1824	* updated to contain new values. This callback is only invoked when
1825	* the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1826	* it is assumed that the struct_ops map cannot be updated.
1827	* @validate: A callback that is invoked after all of the members have been
1828	* initialized. This callback should perform static checks on the
1829	* map, meaning that it should either fail or succeed
1830	* deterministically. A struct_ops map that has been validated may
1831	* not necessarily succeed in being registered if the call to @reg
1832	* fails. For example, a valid struct_ops map may be loaded, but
1833	* then fail to be registered due to there being another active
1834	* struct_ops map on the system in the subsystem already. For this
1835	* reason, if this callback is not defined, the check is skipped as
1836	* the struct_ops map will have final verification performed in
1837	* @reg.
1838	* @type: BTF type.
1839	* @value_type: Value type.
1840	* @name: The name of the struct bpf_struct_ops object.
1841	* @func_models: Func models
1842	* @type_id: BTF type id.
1843	* @value_id: BTF value id.
1844	*/
1845	struct bpf_struct_ops {
1846	const struct bpf_verifier_ops *verifier_ops;
1847	int (*init)(struct btf *btf);
1848	int (*check_member)(const struct btf_type *t,
1849	const struct btf_member *member,
1850	const struct bpf_prog *prog);
1851	int (*init_member)(const struct btf_type *t,
1852	const struct btf_member *member,
1853	void *kdata, const void *udata);
1854	int (*reg)(void *kdata, struct bpf_link *link);
1855	void (*unreg)(void *kdata, struct bpf_link *link);
1856	int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);
1857	int (*validate)(void *kdata);
1858	void *cfi_stubs;
1859	struct module *owner;
1860	const char *name;
1861	struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1862	};
1863
1864	/* Every member of a struct_ops type has an instance even a member is not
1865	* an operator (function pointer). The "info" field will be assigned to
1866	* prog->aux->ctx_arg_info of BPF struct_ops programs to provide the
1867	* argument information required by the verifier to verify the program.
1868	*
1869	* btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the
1870	* corresponding entry for an given argument.
1871	*/
1872	struct bpf_struct_ops_arg_info {
1873	struct bpf_ctx_arg_aux *info;
1874	u32 cnt;
1875	};
1876
1877	struct bpf_struct_ops_desc {
1878	struct bpf_struct_ops *st_ops;
1879
1880	const struct btf_type *type;
1881	const struct btf_type *value_type;
1882	u32 type_id;
1883	u32 value_id;
1884
1885	/* Collection of argument information for each member */
1886	struct bpf_struct_ops_arg_info *arg_info;
1887	};
1888
1889	enum bpf_struct_ops_state {
1890	BPF_STRUCT_OPS_STATE_INIT,
1891	BPF_STRUCT_OPS_STATE_INUSE,
1892	BPF_STRUCT_OPS_STATE_TOBEFREE,
1893	BPF_STRUCT_OPS_STATE_READY,
1894	};
1895
1896	struct bpf_struct_ops_common_value {
1897	refcount_t refcnt;
1898	enum bpf_struct_ops_state state;
1899	};
1900
1901	#if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1902	/* This macro helps developer to register a struct_ops type and generate
1903	* type information correctly. Developers should use this macro to register
1904	* a struct_ops type instead of calling __register_bpf_struct_ops() directly.
1905	*/
1906	#define register_bpf_struct_ops(st_ops, type) \
1907	({ \
1908	struct bpf_struct_ops_##type { \
1909	struct bpf_struct_ops_common_value common; \
1910	struct type data ____cacheline_aligned_in_smp; \
1911	}; \
1912	BTF_TYPE_EMIT(struct bpf_struct_ops_##type); \
1913	__register_bpf_struct_ops(st_ops); \
1914	})
1915	#define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1916	bool bpf_struct_ops_get(const void *kdata);
1917	void bpf_struct_ops_put(const void *kdata);
1918	int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff);
1919	int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1920	void *value);
1921	int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1922	struct bpf_tramp_link *link,
1923	const struct btf_func_model *model,
1924	void *stub_func,
1925	void **image, u32 *image_off,
1926	bool allow_alloc);
1927	void bpf_struct_ops_image_free(void *image);
1928	static inline bool bpf_try_module_get(const void *data, struct module *owner)
1929	{
1930	if (owner == BPF_MODULE_OWNER)
1931	return bpf_struct_ops_get(kdata: data);
1932	else
1933	return try_module_get(module: owner);
1934	}
1935	static inline void bpf_module_put(const void *data, struct module *owner)
1936	{
1937	if (owner == BPF_MODULE_OWNER)
1938	bpf_struct_ops_put(kdata: data);
1939	else
1940	module_put(module: owner);
1941	}
1942	int bpf_struct_ops_link_create(union bpf_attr *attr);
1943
1944	#ifdef CONFIG_NET
1945	/* Define it here to avoid the use of forward declaration */
1946	struct bpf_dummy_ops_state {
1947	int val;
1948	};
1949
1950	struct bpf_dummy_ops {
1951	int (*test_1)(struct bpf_dummy_ops_state *cb);
1952	int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1953	char a3, unsigned long a4);
1954	int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1955	};
1956
1957	int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1958	union bpf_attr __user *uattr);
1959	#endif
1960	int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
1961	struct btf *btf,
1962	struct bpf_verifier_log *log);
1963	void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1964	void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc);
1965	#else
1966	#define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
1967	static inline bool bpf_try_module_get(const void *data, struct module *owner)
1968	{
1969	return try_module_get(owner);
1970	}
1971	static inline void bpf_module_put(const void *data, struct module *owner)
1972	{
1973	module_put(owner);
1974	}
1975	static inline int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)
1976	{
1977	return -ENOTSUPP;
1978	}
1979	static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1980	void *key,
1981	void *value)
1982	{
1983	return -EINVAL;
1984	}
1985	static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1986	{
1987	return -EOPNOTSUPP;
1988	}
1989	static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map)
1990	{
1991	}
1992
1993	static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc)
1994	{
1995	}
1996
1997	#endif
1998
1999	int bpf_prog_ctx_arg_info_init(struct bpf_prog *prog,
2000	const struct bpf_ctx_arg_aux *info, u32 cnt);
2001
2002	#if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
2003	int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
2004	int cgroup_atype);
2005	void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
2006	#else
2007	static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
2008	int cgroup_atype)
2009	{
2010	return -EOPNOTSUPP;
2011	}
2012	static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
2013	{
2014	}
2015	#endif
2016
2017	struct bpf_array {
2018	struct bpf_map map;
2019	u32 elem_size;
2020	u32 index_mask;
2021	struct bpf_array_aux *aux;
2022	union {
2023	DECLARE_FLEX_ARRAY(char, value) __aligned(8);
2024	DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
2025	DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
2026	};
2027	};
2028
2029	#define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
2030	#define MAX_TAIL_CALL_CNT 33
2031
2032	/* Maximum number of loops for bpf_loop and bpf_iter_num.
2033	* It's enum to expose it (and thus make it discoverable) through BTF.
2034	*/
2035	enum {
2036	BPF_MAX_LOOPS = 8 * 1024 * 1024,
2037	BPF_MAX_TIMED_LOOPS = 0xffff,
2038	};
2039
2040	#define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
2041	BPF_F_RDONLY_PROG | \
2042	BPF_F_WRONLY | \
2043	BPF_F_WRONLY_PROG)
2044
2045	#define BPF_MAP_CAN_READ BIT(0)
2046	#define BPF_MAP_CAN_WRITE BIT(1)
2047
2048	/* Maximum number of user-producer ring buffer samples that can be drained in
2049	* a call to bpf_user_ringbuf_drain().
2050	*/
2051	#define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
2052
2053	static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
2054	{
2055	u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2056
2057	/* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
2058	* not possible.
2059	*/
2060	if (access_flags & BPF_F_RDONLY_PROG)
2061	return BPF_MAP_CAN_READ;
2062	else if (access_flags & BPF_F_WRONLY_PROG)
2063	return BPF_MAP_CAN_WRITE;
2064	else
2065	return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
2066	}
2067
2068	static inline bool bpf_map_flags_access_ok(u32 access_flags)
2069	{
2070	return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
2071	(BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2072	}
2073
2074	struct bpf_event_entry {
2075	struct perf_event *event;
2076	struct file *perf_file;
2077	struct file *map_file;
2078	struct rcu_head rcu;
2079	};
2080
2081	static inline bool map_type_contains_progs(struct bpf_map *map)
2082	{
2083	return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
2084	map->map_type == BPF_MAP_TYPE_DEVMAP ||
2085	map->map_type == BPF_MAP_TYPE_CPUMAP;
2086	}
2087
2088	bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
2089	int bpf_prog_calc_tag(struct bpf_prog *fp);
2090
2091	const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
2092	const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
2093
2094	const struct bpf_func_proto *bpf_get_perf_event_read_value_proto(void);
2095
2096	typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
2097	unsigned long off, unsigned long len);
2098	typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
2099	const struct bpf_insn *src,
2100	struct bpf_insn *dst,
2101	struct bpf_prog *prog,
2102	u32 *target_size);
2103
2104	u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
2105	void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
2106
2107	/* an array of programs to be executed under rcu_lock.
2108	*
2109	* Typical usage:
2110	* ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
2111	*
2112	* the structure returned by bpf_prog_array_alloc() should be populated
2113	* with program pointers and the last pointer must be NULL.
2114	* The user has to keep refcnt on the program and make sure the program
2115	* is removed from the array before bpf_prog_put().
2116	* The 'struct bpf_prog_array *' should only be replaced with xchg()
2117	* since other cpus are walking the array of pointers in parallel.
2118	*/
2119	struct bpf_prog_array_item {
2120	struct bpf_prog *prog;
2121	union {
2122	struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
2123	u64 bpf_cookie;
2124	};
2125	};
2126
2127	struct bpf_prog_array {
2128	struct rcu_head rcu;
2129	struct bpf_prog_array_item items[];
2130	};
2131
2132	struct bpf_empty_prog_array {
2133	struct bpf_prog_array hdr;
2134	struct bpf_prog *null_prog;
2135	};
2136
2137	/* to avoid allocating empty bpf_prog_array for cgroups that
2138	* don't have bpf program attached use one global 'bpf_empty_prog_array'
2139	* It will not be modified the caller of bpf_prog_array_alloc()
2140	* (since caller requested prog_cnt == 0)
2141	* that pointer should be 'freed' by bpf_prog_array_free()
2142	*/
2143	extern struct bpf_empty_prog_array bpf_empty_prog_array;
2144
2145	struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
2146	void bpf_prog_array_free(struct bpf_prog_array *progs);
2147	/* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
2148	void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
2149	int bpf_prog_array_length(struct bpf_prog_array *progs);
2150	bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
2151	int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
2152	__u32 __user *prog_ids, u32 cnt);
2153
2154	void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
2155	struct bpf_prog *old_prog);
2156	int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
2157	int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
2158	struct bpf_prog *prog);
2159	int bpf_prog_array_copy_info(struct bpf_prog_array *array,
2160	u32 *prog_ids, u32 request_cnt,
2161	u32 *prog_cnt);
2162	int bpf_prog_array_copy(struct bpf_prog_array *old_array,
2163	struct bpf_prog *exclude_prog,
2164	struct bpf_prog *include_prog,
2165	u64 bpf_cookie,
2166	struct bpf_prog_array **new_array);
2167
2168	struct bpf_run_ctx {};
2169
2170	struct bpf_cg_run_ctx {
2171	struct bpf_run_ctx run_ctx;
2172	const struct bpf_prog_array_item *prog_item;
2173	int retval;
2174	};
2175
2176	struct bpf_trace_run_ctx {
2177	struct bpf_run_ctx run_ctx;
2178	u64 bpf_cookie;
2179	bool is_uprobe;
2180	};
2181
2182	struct bpf_tramp_run_ctx {
2183	struct bpf_run_ctx run_ctx;
2184	u64 bpf_cookie;
2185	struct bpf_run_ctx *saved_run_ctx;
2186	};
2187
2188	static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
2189	{
2190	struct bpf_run_ctx *old_ctx = NULL;
2191
2192	#ifdef CONFIG_BPF_SYSCALL
2193	old_ctx = current->bpf_ctx;
2194	current->bpf_ctx = new_ctx;
2195	#endif
2196	return old_ctx;
2197	}
2198
2199	static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
2200	{
2201	#ifdef CONFIG_BPF_SYSCALL
2202	current->bpf_ctx = old_ctx;
2203	#endif
2204	}
2205
2206	/* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
2207	#define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
2208	/* BPF program asks to set CN on the packet. */
2209	#define BPF_RET_SET_CN (1 << 0)
2210
2211	typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
2212
2213	static __always_inline u32
2214	bpf_prog_run_array(const struct bpf_prog_array *array,
2215	const void *ctx, bpf_prog_run_fn run_prog)
2216	{
2217	const struct bpf_prog_array_item *item;
2218	const struct bpf_prog *prog;
2219	struct bpf_run_ctx *old_run_ctx;
2220	struct bpf_trace_run_ctx run_ctx;
2221	u32 ret = 1;
2222
2223	RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
2224
2225	if (unlikely(!array))
2226	return ret;
2227
2228	run_ctx.is_uprobe = false;
2229
2230	migrate_disable();
2231	old_run_ctx = bpf_set_run_ctx(new_ctx: &run_ctx.run_ctx);
2232	item = &array->items[0];
2233	while ((prog = READ_ONCE(item->prog))) {
2234	run_ctx.bpf_cookie = item->bpf_cookie;
2235	ret &= run_prog(prog, ctx);
2236	item++;
2237	}
2238	bpf_reset_run_ctx(old_ctx: old_run_ctx);
2239	migrate_enable();
2240	return ret;
2241	}
2242
2243	/* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
2244	*
2245	* We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
2246	* overall. As a result, we must use the bpf_prog_array_free_sleepable
2247	* in order to use the tasks_trace rcu grace period.
2248	*
2249	* When a non-sleepable program is inside the array, we take the rcu read
2250	* section and disable preemption for that program alone, so it can access
2251	* rcu-protected dynamically sized maps.
2252	*/
2253	static __always_inline u32
2254	bpf_prog_run_array_uprobe(const struct bpf_prog_array *array,
2255	const void *ctx, bpf_prog_run_fn run_prog)
2256	{
2257	const struct bpf_prog_array_item *item;
2258	const struct bpf_prog *prog;
2259	struct bpf_run_ctx *old_run_ctx;
2260	struct bpf_trace_run_ctx run_ctx;
2261	u32 ret = 1;
2262
2263	might_fault();
2264	RCU_LOCKDEP_WARN(!rcu_read_lock_trace_held(), "no rcu lock held");
2265
2266	if (unlikely(!array))
2267	return ret;
2268
2269	migrate_disable();
2270
2271	run_ctx.is_uprobe = true;
2272
2273	old_run_ctx = bpf_set_run_ctx(new_ctx: &run_ctx.run_ctx);
2274	item = &array->items[0];
2275	while ((prog = READ_ONCE(item->prog))) {
2276	if (!prog->sleepable)
2277	rcu_read_lock();
2278
2279	run_ctx.bpf_cookie = item->bpf_cookie;
2280	ret &= run_prog(prog, ctx);
2281	item++;
2282
2283	if (!prog->sleepable)
2284	rcu_read_unlock();
2285	}
2286	bpf_reset_run_ctx(old_ctx: old_run_ctx);
2287	migrate_enable();
2288	return ret;
2289	}
2290
2291	#ifdef CONFIG_BPF_SYSCALL
2292	DECLARE_PER_CPU(int, bpf_prog_active);
2293	extern struct mutex bpf_stats_enabled_mutex;
2294
2295	/*
2296	* Block execution of BPF programs attached to instrumentation (perf,
2297	* kprobes, tracepoints) to prevent deadlocks on map operations as any of
2298	* these events can happen inside a region which holds a map bucket lock
2299	* and can deadlock on it.
2300	*/
2301	static inline void bpf_disable_instrumentation(void)
2302	{
2303	migrate_disable();
2304	this_cpu_inc(bpf_prog_active);
2305	}
2306
2307	static inline void bpf_enable_instrumentation(void)
2308	{
2309	this_cpu_dec(bpf_prog_active);
2310	migrate_enable();
2311	}
2312
2313	extern const struct super_operations bpf_super_ops;
2314	extern const struct file_operations bpf_map_fops;
2315	extern const struct file_operations bpf_prog_fops;
2316	extern const struct file_operations bpf_iter_fops;
2317
2318	#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2319	extern const struct bpf_prog_ops _name ## _prog_ops; \
2320	extern const struct bpf_verifier_ops _name ## _verifier_ops;
2321	#define BPF_MAP_TYPE(_id, _ops) \
2322	extern const struct bpf_map_ops _ops;
2323	#define BPF_LINK_TYPE(_id, _name)
2324	#include <linux/bpf_types.h>
2325	#undef BPF_PROG_TYPE
2326	#undef BPF_MAP_TYPE
2327	#undef BPF_LINK_TYPE
2328
2329	extern const struct bpf_prog_ops bpf_offload_prog_ops;
2330	extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2331	extern const struct bpf_verifier_ops xdp_analyzer_ops;
2332
2333	struct bpf_prog *bpf_prog_get(u32 ufd);
2334	struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2335	bool attach_drv);
2336	void bpf_prog_add(struct bpf_prog *prog, int i);
2337	void bpf_prog_sub(struct bpf_prog *prog, int i);
2338	void bpf_prog_inc(struct bpf_prog *prog);
2339	struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2340	void bpf_prog_put(struct bpf_prog *prog);
2341
2342	void bpf_prog_free_id(struct bpf_prog *prog);
2343	void bpf_map_free_id(struct bpf_map *map);
2344
2345	struct btf_field *btf_record_find(const struct btf_record *rec,
2346	u32 offset, u32 field_mask);
2347	void btf_record_free(struct btf_record *rec);
2348	void bpf_map_free_record(struct bpf_map *map);
2349	struct btf_record *btf_record_dup(const struct btf_record *rec);
2350	bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2351	void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2352	void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);
2353	void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2354	void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);
2355
2356	struct bpf_map *bpf_map_get(u32 ufd);
2357	struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2358
2359	/*
2360	* The __bpf_map_get() and __btf_get_by_fd() functions parse a file
2361	* descriptor and return a corresponding map or btf object.
2362	* Their names are double underscored to emphasize the fact that they
2363	* do not increase refcnt. To also increase refcnt use corresponding
2364	* bpf_map_get() and btf_get_by_fd() functions.
2365	*/
2366
2367	static inline struct bpf_map *__bpf_map_get(struct fd f)
2368	{
2369	if (fd_empty(f))
2370	return ERR_PTR(error: -EBADF);
2371	if (unlikely(fd_file(f)->f_op != &bpf_map_fops))
2372	return ERR_PTR(error: -EINVAL);
2373	return fd_file(f)->private_data;
2374	}
2375
2376	static inline struct btf *__btf_get_by_fd(struct fd f)
2377	{
2378	if (fd_empty(f))
2379	return ERR_PTR(error: -EBADF);
2380	if (unlikely(fd_file(f)->f_op != &btf_fops))
2381	return ERR_PTR(error: -EINVAL);
2382	return fd_file(f)->private_data;
2383	}
2384
2385	void bpf_map_inc(struct bpf_map *map);
2386	void bpf_map_inc_with_uref(struct bpf_map *map);
2387	struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2388	struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2389	void bpf_map_put_with_uref(struct bpf_map *map);
2390	void bpf_map_put(struct bpf_map *map);
2391	void *bpf_map_area_alloc(u64 size, int numa_node);
2392	void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2393	void bpf_map_area_free(void *base);
2394	bool bpf_map_write_active(const struct bpf_map *map);
2395	void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2396	int generic_map_lookup_batch(struct bpf_map *map,
2397	const union bpf_attr *attr,
2398	union bpf_attr __user *uattr);
2399	int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2400	const union bpf_attr *attr,
2401	union bpf_attr __user *uattr);
2402	int generic_map_delete_batch(struct bpf_map *map,
2403	const union bpf_attr *attr,
2404	union bpf_attr __user *uattr);
2405	struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2406	struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2407
2408	int bpf_map_alloc_pages(const struct bpf_map *map, int nid,
2409	unsigned long nr_pages, struct page **page_array);
2410	#ifdef CONFIG_MEMCG
2411	void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2412	int node);
2413	void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2414	void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2415	gfp_t flags);
2416	void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2417	size_t align, gfp_t flags);
2418	#else
2419	/*
2420	* These specialized allocators have to be macros for their allocations to be
2421	* accounted separately (to have separate alloc_tag).
2422	*/
2423	#define bpf_map_kmalloc_node(_map, _size, _flags, _node) \
2424	kmalloc_node(_size, _flags, _node)
2425	#define bpf_map_kzalloc(_map, _size, _flags) \
2426	kzalloc(_size, _flags)
2427	#define bpf_map_kvcalloc(_map, _n, _size, _flags) \
2428	kvcalloc(_n, _size, _flags)
2429	#define bpf_map_alloc_percpu(_map, _size, _align, _flags) \
2430	__alloc_percpu_gfp(_size, _align, _flags)
2431	#endif
2432
2433	static inline int
2434	bpf_map_init_elem_count(struct bpf_map *map)
2435	{
2436	size_t size = sizeof(*map->elem_count), align = size;
2437	gfp_t flags = GFP_USER | __GFP_NOWARN;
2438
2439	map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2440	if (!map->elem_count)
2441	return -ENOMEM;
2442
2443	return 0;
2444	}
2445
2446	static inline void
2447	bpf_map_free_elem_count(struct bpf_map *map)
2448	{
2449	free_percpu(pdata: map->elem_count);
2450	}
2451
2452	static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2453	{
2454	this_cpu_inc(*map->elem_count);
2455	}
2456
2457	static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2458	{
2459	this_cpu_dec(*map->elem_count);
2460	}
2461
2462	extern int sysctl_unprivileged_bpf_disabled;
2463
2464	bool bpf_token_capable(const struct bpf_token *token, int cap);
2465
2466	static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token)
2467	{
2468	return bpf_token_capable(token, CAP_PERFMON);
2469	}
2470
2471	static inline bool bpf_allow_uninit_stack(const struct bpf_token *token)
2472	{
2473	return bpf_token_capable(token, CAP_PERFMON);
2474	}
2475
2476	static inline bool bpf_bypass_spec_v1(const struct bpf_token *token)
2477	{
2478	return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
2479	}
2480
2481	static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)
2482	{
2483	return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
2484	}
2485
2486	int bpf_map_new_fd(struct bpf_map *map, int flags);
2487	int bpf_prog_new_fd(struct bpf_prog *prog);
2488
2489	void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2490	const struct bpf_link_ops *ops, struct bpf_prog *prog);
2491	void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
2492	const struct bpf_link_ops *ops, struct bpf_prog *prog,
2493	bool sleepable);
2494	int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2495	int bpf_link_settle(struct bpf_link_primer *primer);
2496	void bpf_link_cleanup(struct bpf_link_primer *primer);
2497	void bpf_link_inc(struct bpf_link *link);
2498	struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
2499	void bpf_link_put(struct bpf_link *link);
2500	int bpf_link_new_fd(struct bpf_link *link);
2501	struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2502	struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2503
2504	void bpf_token_inc(struct bpf_token *token);
2505	void bpf_token_put(struct bpf_token *token);
2506	int bpf_token_create(union bpf_attr *attr);
2507	struct bpf_token *bpf_token_get_from_fd(u32 ufd);
2508
2509	bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
2510	bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type);
2511	bool bpf_token_allow_prog_type(const struct bpf_token *token,
2512	enum bpf_prog_type prog_type,
2513	enum bpf_attach_type attach_type);
2514
2515	int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2516	int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2517	struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir,
2518	umode_t mode);
2519
2520	#define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2521	#define DEFINE_BPF_ITER_FUNC(target, args...) \
2522	extern int bpf_iter_ ## target(args); \
2523	int __init bpf_iter_ ## target(args) { return 0; }
2524
2525	/*
2526	* The task type of iterators.
2527	*
2528	* For BPF task iterators, they can be parameterized with various
2529	* parameters to visit only some of tasks.
2530	*
2531	* BPF_TASK_ITER_ALL (default)
2532	* Iterate over resources of every task.
2533	*
2534	* BPF_TASK_ITER_TID
2535	* Iterate over resources of a task/tid.
2536	*
2537	* BPF_TASK_ITER_TGID
2538	* Iterate over resources of every task of a process / task group.
2539	*/
2540	enum bpf_iter_task_type {
2541	BPF_TASK_ITER_ALL = 0,
2542	BPF_TASK_ITER_TID,
2543	BPF_TASK_ITER_TGID,
2544	};
2545
2546	struct bpf_iter_aux_info {
2547	/* for map_elem iter */
2548	struct bpf_map *map;
2549
2550	/* for cgroup iter */
2551	struct {
2552	struct cgroup *start; /* starting cgroup */
2553	enum bpf_cgroup_iter_order order;
2554	} cgroup;
2555	struct {
2556	enum bpf_iter_task_type type;
2557	u32 pid;
2558	} task;
2559	};
2560
2561	typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2562	union bpf_iter_link_info *linfo,
2563	struct bpf_iter_aux_info *aux);
2564	typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2565	typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2566	struct seq_file *seq);
2567	typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2568	struct bpf_link_info *info);
2569	typedef const struct bpf_func_proto *
2570	(*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2571	const struct bpf_prog *prog);
2572
2573	enum bpf_iter_feature {
2574	BPF_ITER_RESCHED = BIT(0),
2575	};
2576
2577	#define BPF_ITER_CTX_ARG_MAX 2
2578	struct bpf_iter_reg {
2579	const char *target;
2580	bpf_iter_attach_target_t attach_target;
2581	bpf_iter_detach_target_t detach_target;
2582	bpf_iter_show_fdinfo_t show_fdinfo;
2583	bpf_iter_fill_link_info_t fill_link_info;
2584	bpf_iter_get_func_proto_t get_func_proto;
2585	u32 ctx_arg_info_size;
2586	u32 feature;
2587	struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2588	const struct bpf_iter_seq_info *seq_info;
2589	};
2590
2591	struct bpf_iter_meta {
2592	__bpf_md_ptr(struct seq_file *, seq);
2593	u64 session_id;
2594	u64 seq_num;
2595	};
2596
2597	struct bpf_iter__bpf_map_elem {
2598	__bpf_md_ptr(struct bpf_iter_meta *, meta);
2599	__bpf_md_ptr(struct bpf_map *, map);
2600	__bpf_md_ptr(void *, key);
2601	__bpf_md_ptr(void *, value);
2602	};
2603
2604	int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2605	void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2606	int bpf_iter_prog_supported(struct bpf_prog *prog);
2607	const struct bpf_func_proto *
2608	bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2609	int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2610	int bpf_iter_new_fd(struct bpf_link *link);
2611	bool bpf_link_is_iter(struct bpf_link *link);
2612	struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2613	int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2614	void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2615	struct seq_file *seq);
2616	int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2617	struct bpf_link_info *info);
2618
2619	int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2620	struct bpf_func_state *caller,
2621	struct bpf_func_state *callee);
2622
2623	int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2624	int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2625	int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2626	u64 flags);
2627	int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2628	u64 flags);
2629
2630	int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2631
2632	int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2633	void *key, void *value, u64 map_flags);
2634	int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2635	int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2636	void *key, void *value, u64 map_flags);
2637	int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2638
2639	int bpf_get_file_flag(int flags);
2640	int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2641	size_t actual_size);
2642
2643	/* verify correctness of eBPF program */
2644	int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2645
2646	#ifndef CONFIG_BPF_JIT_ALWAYS_ON
2647	void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2648	#endif
2649
2650	struct btf *bpf_get_btf_vmlinux(void);
2651
2652	/* Map specifics */
2653	struct xdp_frame;
2654	struct sk_buff;
2655	struct bpf_dtab_netdev;
2656	struct bpf_cpu_map_entry;
2657
2658	void __dev_flush(struct list_head *flush_list);
2659	int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2660	struct net_device *dev_rx);
2661	int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2662	struct net_device *dev_rx);
2663	int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2664	struct bpf_map *map, bool exclude_ingress);
2665	int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2666	const struct bpf_prog *xdp_prog);
2667	int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2668	const struct bpf_prog *xdp_prog,
2669	struct bpf_map *map, bool exclude_ingress);
2670
2671	void __cpu_map_flush(struct list_head *flush_list);
2672	int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2673	struct net_device *dev_rx);
2674	int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2675	struct sk_buff *skb);
2676
2677	/* Return map's numa specified by userspace */
2678	static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2679	{
2680	return (attr->map_flags & BPF_F_NUMA_NODE) ?
2681	attr->numa_node : NUMA_NO_NODE;
2682	}
2683
2684	struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2685	int array_map_alloc_check(union bpf_attr *attr);
2686
2687	int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2688	union bpf_attr __user *uattr);
2689	int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2690	union bpf_attr __user *uattr);
2691	int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2692	const union bpf_attr *kattr,
2693	union bpf_attr __user *uattr);
2694	int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2695	const union bpf_attr *kattr,
2696	union bpf_attr __user *uattr);
2697	int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2698	const union bpf_attr *kattr,
2699	union bpf_attr __user *uattr);
2700	int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2701	const union bpf_attr *kattr,
2702	union bpf_attr __user *uattr);
2703	int bpf_prog_test_run_nf(struct bpf_prog *prog,
2704	const union bpf_attr *kattr,
2705	union bpf_attr __user *uattr);
2706	bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2707	const struct bpf_prog *prog,
2708	struct bpf_insn_access_aux *info);
2709
2710	static inline bool bpf_tracing_ctx_access(int off, int size,
2711	enum bpf_access_type type)
2712	{
2713	if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2714	return false;
2715	if (type != BPF_READ)
2716	return false;
2717	if (off % size != 0)
2718	return false;
2719	return true;
2720	}
2721
2722	static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2723	enum bpf_access_type type,
2724	const struct bpf_prog *prog,
2725	struct bpf_insn_access_aux *info)
2726	{
2727	if (!bpf_tracing_ctx_access(off, size, type))
2728	return false;
2729	return btf_ctx_access(off, size, type, prog, info);
2730	}
2731
2732	int btf_struct_access(struct bpf_verifier_log *log,
2733	const struct bpf_reg_state *reg,
2734	int off, int size, enum bpf_access_type atype,
2735	u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2736	bool btf_struct_ids_match(struct bpf_verifier_log *log,
2737	const struct btf *btf, u32 id, int off,
2738	const struct btf *need_btf, u32 need_type_id,
2739	bool strict);
2740
2741	int btf_distill_func_proto(struct bpf_verifier_log *log,
2742	struct btf *btf,
2743	const struct btf_type *func_proto,
2744	const char *func_name,
2745	struct btf_func_model *m);
2746
2747	struct bpf_reg_state;
2748	int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog);
2749	int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2750	struct btf *btf, const struct btf_type *t);
2751	const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
2752	int comp_idx, const char *tag_key);
2753	int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,
2754	int comp_idx, const char *tag_key, int last_id);
2755
2756	struct bpf_prog *bpf_prog_by_id(u32 id);
2757	struct bpf_link *bpf_link_by_id(u32 id);
2758
2759	const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id,
2760	const struct bpf_prog *prog);
2761	void bpf_task_storage_free(struct task_struct *task);
2762	void bpf_cgrp_storage_free(struct cgroup *cgroup);
2763	bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2764	const struct btf_func_model *
2765	bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2766	const struct bpf_insn *insn);
2767	int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2768	u16 btf_fd_idx, u8 **func_addr);
2769
2770	struct bpf_core_ctx {
2771	struct bpf_verifier_log *log;
2772	const struct btf *btf;
2773	};
2774
2775	bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2776	const struct bpf_reg_state *reg,
2777	const char *field_name, u32 btf_id, const char *suffix);
2778
2779	bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2780	const struct btf *reg_btf, u32 reg_id,
2781	const struct btf *arg_btf, u32 arg_id);
2782
2783	int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2784	int relo_idx, void *insn);
2785
2786	static inline bool unprivileged_ebpf_enabled(void)
2787	{
2788	return !sysctl_unprivileged_bpf_disabled;
2789	}
2790
2791	/* Not all bpf prog type has the bpf_ctx.
2792	* For the bpf prog type that has initialized the bpf_ctx,
2793	* this function can be used to decide if a kernel function
2794	* is called by a bpf program.
2795	*/
2796	static inline bool has_current_bpf_ctx(void)
2797	{
2798	return !!current->bpf_ctx;
2799	}
2800
2801	void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2802
2803	void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2804	enum bpf_dynptr_type type, u32 offset, u32 size);
2805	void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2806	void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2807
2808	#else /* !CONFIG_BPF_SYSCALL */
2809	static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2810	{
2811	return ERR_PTR(-EOPNOTSUPP);
2812	}
2813
2814	static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2815	enum bpf_prog_type type,
2816	bool attach_drv)
2817	{
2818	return ERR_PTR(-EOPNOTSUPP);
2819	}
2820
2821	static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2822	{
2823	}
2824
2825	static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2826	{
2827	}
2828
2829	static inline void bpf_prog_put(struct bpf_prog *prog)
2830	{
2831	}
2832
2833	static inline void bpf_prog_inc(struct bpf_prog *prog)
2834	{
2835	}
2836
2837	static inline struct bpf_prog *__must_check
2838	bpf_prog_inc_not_zero(struct bpf_prog *prog)
2839	{
2840	return ERR_PTR(-EOPNOTSUPP);
2841	}
2842
2843	static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2844	const struct bpf_link_ops *ops,
2845	struct bpf_prog *prog)
2846	{
2847	}
2848
2849	static inline void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
2850	const struct bpf_link_ops *ops, struct bpf_prog *prog,
2851	bool sleepable)
2852	{
2853	}
2854
2855	static inline int bpf_link_prime(struct bpf_link *link,
2856	struct bpf_link_primer *primer)
2857	{
2858	return -EOPNOTSUPP;
2859	}
2860
2861	static inline int bpf_link_settle(struct bpf_link_primer *primer)
2862	{
2863	return -EOPNOTSUPP;
2864	}
2865
2866	static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2867	{
2868	}
2869
2870	static inline void bpf_link_inc(struct bpf_link *link)
2871	{
2872	}
2873
2874	static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
2875	{
2876	return NULL;
2877	}
2878
2879	static inline void bpf_link_put(struct bpf_link *link)
2880	{
2881	}
2882
2883	static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2884	{
2885	return -EOPNOTSUPP;
2886	}
2887
2888	static inline bool bpf_token_capable(const struct bpf_token *token, int cap)
2889	{
2890	return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));
2891	}
2892
2893	static inline void bpf_token_inc(struct bpf_token *token)
2894	{
2895	}
2896
2897	static inline void bpf_token_put(struct bpf_token *token)
2898	{
2899	}
2900
2901	static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd)
2902	{
2903	return ERR_PTR(-EOPNOTSUPP);
2904	}
2905
2906	static inline void __dev_flush(struct list_head *flush_list)
2907	{
2908	}
2909
2910	struct xdp_frame;
2911	struct bpf_dtab_netdev;
2912	struct bpf_cpu_map_entry;
2913
2914	static inline
2915	int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2916	struct net_device *dev_rx)
2917	{
2918	return 0;
2919	}
2920
2921	static inline
2922	int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2923	struct net_device *dev_rx)
2924	{
2925	return 0;
2926	}
2927
2928	static inline
2929	int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2930	struct bpf_map *map, bool exclude_ingress)
2931	{
2932	return 0;
2933	}
2934
2935	struct sk_buff;
2936
2937	static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2938	struct sk_buff *skb,
2939	const struct bpf_prog *xdp_prog)
2940	{
2941	return 0;
2942	}
2943
2944	static inline
2945	int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2946	const struct bpf_prog *xdp_prog,
2947	struct bpf_map *map, bool exclude_ingress)
2948	{
2949	return 0;
2950	}
2951
2952	static inline void __cpu_map_flush(struct list_head *flush_list)
2953	{
2954	}
2955
2956	static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2957	struct xdp_frame *xdpf,
2958	struct net_device *dev_rx)
2959	{
2960	return 0;
2961	}
2962
2963	static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2964	struct sk_buff *skb)
2965	{
2966	return -EOPNOTSUPP;
2967	}
2968
2969	static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2970	enum bpf_prog_type type)
2971	{
2972	return ERR_PTR(-EOPNOTSUPP);
2973	}
2974
2975	static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2976	const union bpf_attr *kattr,
2977	union bpf_attr __user *uattr)
2978	{
2979	return -ENOTSUPP;
2980	}
2981
2982	static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2983	const union bpf_attr *kattr,
2984	union bpf_attr __user *uattr)
2985	{
2986	return -ENOTSUPP;
2987	}
2988
2989	static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2990	const union bpf_attr *kattr,
2991	union bpf_attr __user *uattr)
2992	{
2993	return -ENOTSUPP;
2994	}
2995
2996	static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2997	const union bpf_attr *kattr,
2998	union bpf_attr __user *uattr)
2999	{
3000	return -ENOTSUPP;
3001	}
3002
3003	static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
3004	const union bpf_attr *kattr,
3005	union bpf_attr __user *uattr)
3006	{
3007	return -ENOTSUPP;
3008	}
3009
3010	static inline void bpf_map_put(struct bpf_map *map)
3011	{
3012	}
3013
3014	static inline struct bpf_prog *bpf_prog_by_id(u32 id)
3015	{
3016	return ERR_PTR(-ENOTSUPP);
3017	}
3018
3019	static inline int btf_struct_access(struct bpf_verifier_log *log,
3020	const struct bpf_reg_state *reg,
3021	int off, int size, enum bpf_access_type atype,
3022	u32 *next_btf_id, enum bpf_type_flag *flag,
3023	const char **field_name)
3024	{
3025	return -EACCES;
3026	}
3027
3028	static inline const struct bpf_func_proto *
3029	bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
3030	{
3031	return NULL;
3032	}
3033
3034	static inline void bpf_task_storage_free(struct task_struct *task)
3035	{
3036	}
3037
3038	static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
3039	{
3040	return false;
3041	}
3042
3043	static inline const struct btf_func_model *
3044	bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
3045	const struct bpf_insn *insn)
3046	{
3047	return NULL;
3048	}
3049
3050	static inline int
3051	bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
3052	u16 btf_fd_idx, u8 **func_addr)
3053	{
3054	return -ENOTSUPP;
3055	}
3056
3057	static inline bool unprivileged_ebpf_enabled(void)
3058	{
3059	return false;
3060	}
3061
3062	static inline bool has_current_bpf_ctx(void)
3063	{
3064	return false;
3065	}
3066
3067	static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
3068	{
3069	}
3070
3071	static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
3072	{
3073	}
3074
3075	static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
3076	enum bpf_dynptr_type type, u32 offset, u32 size)
3077	{
3078	}
3079
3080	static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
3081	{
3082	}
3083
3084	static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
3085	{
3086	}
3087	#endif /* CONFIG_BPF_SYSCALL */
3088
3089	static __always_inline int
3090	bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
3091	{
3092	int ret = -EFAULT;
3093
3094	if (IS_ENABLED(CONFIG_BPF_EVENTS))
3095	ret = copy_from_kernel_nofault(dst, src: unsafe_ptr, size);
3096	if (unlikely(ret < 0))
3097	memset(dst, 0, size);
3098	return ret;
3099	}
3100
3101	void __bpf_free_used_btfs(struct btf_mod_pair *used_btfs, u32 len);
3102
3103	static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
3104	enum bpf_prog_type type)
3105	{
3106	return bpf_prog_get_type_dev(ufd, type, attach_drv: false);
3107	}
3108
3109	void __bpf_free_used_maps(struct bpf_prog_aux *aux,
3110	struct bpf_map **used_maps, u32 len);
3111
3112	bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
3113
3114	int bpf_prog_offload_compile(struct bpf_prog *prog);
3115	void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
3116	int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
3117	struct bpf_prog *prog);
3118
3119	int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
3120
3121	int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
3122	int bpf_map_offload_update_elem(struct bpf_map *map,
3123	void *key, void *value, u64 flags);
3124	int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
3125	int bpf_map_offload_get_next_key(struct bpf_map *map,
3126	void *key, void *next_key);
3127
3128	bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
3129
3130	struct bpf_offload_dev *
3131	bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
3132	void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
3133	void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
3134	int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
3135	struct net_device *netdev);
3136	void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
3137	struct net_device *netdev);
3138	bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
3139
3140	void unpriv_ebpf_notify(int new_state);
3141
3142	#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
3143	int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3144	struct bpf_prog_aux *prog_aux);
3145	void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
3146	int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
3147	int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
3148	void bpf_dev_bound_netdev_unregister(struct net_device *dev);
3149
3150	static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3151	{
3152	return aux->dev_bound;
3153	}
3154
3155	static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
3156	{
3157	return aux->offload_requested;
3158	}
3159
3160	bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
3161
3162	static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3163	{
3164	return unlikely(map->ops == &bpf_map_offload_ops);
3165	}
3166
3167	struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
3168	void bpf_map_offload_map_free(struct bpf_map *map);
3169	u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
3170	int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3171	const union bpf_attr *kattr,
3172	union bpf_attr __user *uattr);
3173
3174	int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
3175	int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
3176	int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
3177	int sock_map_bpf_prog_query(const union bpf_attr *attr,
3178	union bpf_attr __user *uattr);
3179	int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog);
3180
3181	void sock_map_unhash(struct sock *sk);
3182	void sock_map_destroy(struct sock *sk);
3183	void sock_map_close(struct sock *sk, long timeout);
3184	#else
3185	static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3186	struct bpf_prog_aux *prog_aux)
3187	{
3188	return -EOPNOTSUPP;
3189	}
3190
3191	static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
3192	u32 func_id)
3193	{
3194	return NULL;
3195	}
3196
3197	static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
3198	union bpf_attr *attr)
3199	{
3200	return -EOPNOTSUPP;
3201	}
3202
3203	static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
3204	struct bpf_prog *old_prog)
3205	{
3206	return -EOPNOTSUPP;
3207	}
3208
3209	static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
3210	{
3211	}
3212
3213	static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3214	{
3215	return false;
3216	}
3217
3218	static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
3219	{
3220	return false;
3221	}
3222
3223	static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
3224	{
3225	return false;
3226	}
3227
3228	static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3229	{
3230	return false;
3231	}
3232
3233	static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
3234	{
3235	return ERR_PTR(-EOPNOTSUPP);
3236	}
3237
3238	static inline void bpf_map_offload_map_free(struct bpf_map *map)
3239	{
3240	}
3241
3242	static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
3243	{
3244	return 0;
3245	}
3246
3247	static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3248	const union bpf_attr *kattr,
3249	union bpf_attr __user *uattr)
3250	{
3251	return -ENOTSUPP;
3252	}
3253
3254	#ifdef CONFIG_BPF_SYSCALL
3255	static inline int sock_map_get_from_fd(const union bpf_attr *attr,
3256	struct bpf_prog *prog)
3257	{
3258	return -EINVAL;
3259	}
3260
3261	static inline int sock_map_prog_detach(const union bpf_attr *attr,
3262	enum bpf_prog_type ptype)
3263	{
3264	return -EOPNOTSUPP;
3265	}
3266
3267	static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
3268	u64 flags)
3269	{
3270	return -EOPNOTSUPP;
3271	}
3272
3273	static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
3274	union bpf_attr __user *uattr)
3275	{
3276	return -EINVAL;
3277	}
3278
3279	static inline int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
3280	{
3281	return -EOPNOTSUPP;
3282	}
3283	#endif /* CONFIG_BPF_SYSCALL */
3284	#endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
3285
3286	static __always_inline void
3287	bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
3288	{
3289	const struct bpf_prog_array_item *item;
3290	struct bpf_prog *prog;
3291
3292	if (unlikely(!array))
3293	return;
3294
3295	item = &array->items[0];
3296	while ((prog = READ_ONCE(item->prog))) {
3297	bpf_prog_inc_misses_counter(prog);
3298	item++;
3299	}
3300	}
3301
3302	#if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
3303	void bpf_sk_reuseport_detach(struct sock *sk);
3304	int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
3305	void *value);
3306	int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
3307	void *value, u64 map_flags);
3308	#else
3309	static inline void bpf_sk_reuseport_detach(struct sock *sk)
3310	{
3311	}
3312
3313	#ifdef CONFIG_BPF_SYSCALL
3314	static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
3315	void *key, void *value)
3316	{
3317	return -EOPNOTSUPP;
3318	}
3319
3320	static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
3321	void *key, void *value,
3322	u64 map_flags)
3323	{
3324	return -EOPNOTSUPP;
3325	}
3326	#endif /* CONFIG_BPF_SYSCALL */
3327	#endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
3328
3329	/* verifier prototypes for helper functions called from eBPF programs */
3330	extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
3331	extern const struct bpf_func_proto bpf_map_update_elem_proto;
3332	extern const struct bpf_func_proto bpf_map_delete_elem_proto;
3333	extern const struct bpf_func_proto bpf_map_push_elem_proto;
3334	extern const struct bpf_func_proto bpf_map_pop_elem_proto;
3335	extern const struct bpf_func_proto bpf_map_peek_elem_proto;
3336	extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
3337
3338	extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
3339	extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
3340	extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
3341	extern const struct bpf_func_proto bpf_tail_call_proto;
3342	extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
3343	extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
3344	extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
3345	extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
3346	extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
3347	extern const struct bpf_func_proto bpf_get_current_comm_proto;
3348	extern const struct bpf_func_proto bpf_get_stackid_proto;
3349	extern const struct bpf_func_proto bpf_get_stack_proto;
3350	extern const struct bpf_func_proto bpf_get_stack_sleepable_proto;
3351	extern const struct bpf_func_proto bpf_get_task_stack_proto;
3352	extern const struct bpf_func_proto bpf_get_task_stack_sleepable_proto;
3353	extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
3354	extern const struct bpf_func_proto bpf_get_stack_proto_pe;
3355	extern const struct bpf_func_proto bpf_sock_map_update_proto;
3356	extern const struct bpf_func_proto bpf_sock_hash_update_proto;
3357	extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
3358	extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3359	extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3360	extern const struct bpf_func_proto bpf_current_task_under_cgroup_proto;
3361	extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3362	extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3363	extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3364	extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3365	extern const struct bpf_func_proto bpf_spin_lock_proto;
3366	extern const struct bpf_func_proto bpf_spin_unlock_proto;
3367	extern const struct bpf_func_proto bpf_get_local_storage_proto;
3368	extern const struct bpf_func_proto bpf_strtol_proto;
3369	extern const struct bpf_func_proto bpf_strtoul_proto;
3370	extern const struct bpf_func_proto bpf_tcp_sock_proto;
3371	extern const struct bpf_func_proto bpf_jiffies64_proto;
3372	extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3373	extern const struct bpf_func_proto bpf_event_output_data_proto;
3374	extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3375	extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3376	extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3377	extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3378	extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3379	extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3380	extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3381	extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3382	extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3383	extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3384	extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3385	extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3386	extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3387	extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3388	extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3389	extern const struct bpf_func_proto bpf_copy_from_user_proto;
3390	extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3391	extern const struct bpf_func_proto bpf_snprintf_proto;
3392	extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3393	extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3394	extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3395	extern const struct bpf_func_proto bpf_sock_from_file_proto;
3396	extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3397	extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3398	extern const struct bpf_func_proto bpf_task_storage_get_proto;
3399	extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3400	extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3401	extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3402	extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3403	extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3404	extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3405	extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3406	extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3407	extern const struct bpf_func_proto bpf_find_vma_proto;
3408	extern const struct bpf_func_proto bpf_loop_proto;
3409	extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3410	extern const struct bpf_func_proto bpf_set_retval_proto;
3411	extern const struct bpf_func_proto bpf_get_retval_proto;
3412	extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3413	extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3414	extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3415
3416	const struct bpf_func_proto *tracing_prog_func_proto(
3417	enum bpf_func_id func_id, const struct bpf_prog *prog);
3418
3419	/* Shared helpers among cBPF and eBPF. */
3420	void bpf_user_rnd_init_once(void);
3421	u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3422	u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3423
3424	#if defined(CONFIG_NET)
3425	bool bpf_sock_common_is_valid_access(int off, int size,
3426	enum bpf_access_type type,
3427	struct bpf_insn_access_aux *info);
3428	bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3429	struct bpf_insn_access_aux *info);
3430	u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3431	const struct bpf_insn *si,
3432	struct bpf_insn *insn_buf,
3433	struct bpf_prog *prog,
3434	u32 *target_size);
3435	int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3436	struct bpf_dynptr *ptr);
3437	#else
3438	static inline bool bpf_sock_common_is_valid_access(int off, int size,
3439	enum bpf_access_type type,
3440	struct bpf_insn_access_aux *info)
3441	{
3442	return false;
3443	}
3444	static inline bool bpf_sock_is_valid_access(int off, int size,
3445	enum bpf_access_type type,
3446	struct bpf_insn_access_aux *info)
3447	{
3448	return false;
3449	}
3450	static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3451	const struct bpf_insn *si,
3452	struct bpf_insn *insn_buf,
3453	struct bpf_prog *prog,
3454	u32 *target_size)
3455	{
3456	return 0;
3457	}
3458	static inline int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3459	struct bpf_dynptr *ptr)
3460	{
3461	return -EOPNOTSUPP;
3462	}
3463	#endif
3464
3465	#ifdef CONFIG_INET
3466	struct sk_reuseport_kern {
3467	struct sk_buff *skb;
3468	struct sock *sk;
3469	struct sock *selected_sk;
3470	struct sock *migrating_sk;
3471	void *data_end;
3472	u32 hash;
3473	u32 reuseport_id;
3474	bool bind_inany;
3475	};
3476	bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3477	struct bpf_insn_access_aux *info);
3478
3479	u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3480	const struct bpf_insn *si,
3481	struct bpf_insn *insn_buf,
3482	struct bpf_prog *prog,
3483	u32 *target_size);
3484
3485	bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3486	struct bpf_insn_access_aux *info);
3487
3488	u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3489	const struct bpf_insn *si,
3490	struct bpf_insn *insn_buf,
3491	struct bpf_prog *prog,
3492	u32 *target_size);
3493	#else
3494	static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3495	enum bpf_access_type type,
3496	struct bpf_insn_access_aux *info)
3497	{
3498	return false;
3499	}
3500
3501	static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3502	const struct bpf_insn *si,
3503	struct bpf_insn *insn_buf,
3504	struct bpf_prog *prog,
3505	u32 *target_size)
3506	{
3507	return 0;
3508	}
3509	static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3510	enum bpf_access_type type,
3511	struct bpf_insn_access_aux *info)
3512	{
3513	return false;
3514	}
3515
3516	static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3517	const struct bpf_insn *si,
3518	struct bpf_insn *insn_buf,
3519	struct bpf_prog *prog,
3520	u32 *target_size)
3521	{
3522	return 0;
3523	}
3524	#endif /* CONFIG_INET */
3525
3526	enum bpf_text_poke_type {
3527	BPF_MOD_CALL,
3528	BPF_MOD_JUMP,
3529	};
3530
3531	int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3532	void *addr1, void *addr2);
3533
3534	void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3535	struct bpf_prog *new, struct bpf_prog *old);
3536
3537	void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3538	int bpf_arch_text_invalidate(void *dst, size_t len);
3539
3540	struct btf_id_set;
3541	bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3542
3543	#define MAX_BPRINTF_VARARGS 12
3544	#define MAX_BPRINTF_BUF 1024
3545
3546	struct bpf_bprintf_data {
3547	u32 *bin_args;
3548	char *buf;
3549	bool get_bin_args;
3550	bool get_buf;
3551	};
3552
3553	int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3554	u32 num_args, struct bpf_bprintf_data *data);
3555	void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3556
3557	#ifdef CONFIG_BPF_LSM
3558	void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3559	void bpf_cgroup_atype_put(int cgroup_atype);
3560	#else
3561	static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
3562	static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3563	#endif /* CONFIG_BPF_LSM */
3564
3565	struct key;
3566
3567	#ifdef CONFIG_KEYS
3568	struct bpf_key {
3569	struct key *key;
3570	bool has_ref;
3571	};
3572	#endif /* CONFIG_KEYS */
3573
3574	static inline bool type_is_alloc(u32 type)
3575	{
3576	return type & MEM_ALLOC;
3577	}
3578
3579	static inline gfp_t bpf_memcg_flags(gfp_t flags)
3580	{
3581	if (memcg_bpf_enabled())
3582	return flags | __GFP_ACCOUNT;
3583	return flags;
3584	}
3585
3586	static inline bool bpf_is_subprog(const struct bpf_prog *prog)
3587	{
3588	return prog->aux->func_idx != 0;
3589	}
3590
3591	#endif /* _LINUX_BPF_H */
3592