bpf.h

   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 <crypto/sha2.h>
  11#include <linux/workqueue.h>
  12#include <linux/file.h>
  13#include <linux/percpu.h>
  14#include <linux/err.h>
  15#include <linux/rbtree_latch.h>
  16#include <linux/numa.h>
  17#include <linux/mm_types.h>
  18#include <linux/wait.h>
  19#include <linux/refcount.h>
  20#include <linux/mutex.h>
  21#include <linux/module.h>
  22#include <linux/kallsyms.h>
  23#include <linux/capability.h>
  24#include <linux/sched/mm.h>
  25#include <linux/slab.h>
  26#include <linux/percpu-refcount.h>
  27#include <linux/stddef.h>
  28#include <linux/bpfptr.h>
  29#include <linux/btf.h>
  30#include <linux/rcupdate_trace.h>
  31#include <linux/static_call.h>
  32#include <linux/memcontrol.h>
  33#include <linux/cfi.h>
  34#include <asm/rqspinlock.h>
  35
  36struct bpf_verifier_env;
  37struct bpf_verifier_log;
  38struct perf_event;
  39struct bpf_prog;
  40struct bpf_prog_aux;
  41struct bpf_map;
  42struct bpf_arena;
  43struct sock;
  44struct seq_file;
  45struct btf;
  46struct btf_type;
  47struct exception_table_entry;
  48struct seq_operations;
  49struct bpf_iter_aux_info;
  50struct bpf_local_storage;
  51struct bpf_local_storage_map;
  52struct kobject;
  53struct mem_cgroup;
  54struct module;
  55struct bpf_func_state;
  56struct ftrace_ops;
  57struct cgroup;
  58struct bpf_token;
  59struct user_namespace;
  60struct super_block;
  61struct inode;
  62
  63extern struct idr btf_idr;
  64extern spinlock_t btf_idr_lock;
  65extern struct kobject *btf_kobj;
  66extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
  67extern bool bpf_global_ma_set;
  68
  69typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
  70typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
  71					struct bpf_iter_aux_info *aux);
  72typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
  73typedef unsigned int (*bpf_func_t)(const void *,
  74				   const struct bpf_insn *);
  75struct bpf_iter_seq_info {
  76	const struct seq_operations *seq_ops;
  77	bpf_iter_init_seq_priv_t init_seq_private;
  78	bpf_iter_fini_seq_priv_t fini_seq_private;
  79	u32 seq_priv_size;
  80};
  81
  82/* map is generic key/value storage optionally accessible by eBPF programs */
  83struct bpf_map_ops {
  84	/* funcs callable from userspace (via syscall) */
  85	int (*map_alloc_check)(union bpf_attr *attr);
  86	struct bpf_map *(*map_alloc)(union bpf_attr *attr);
  87	void (*map_release)(struct bpf_map *map, struct file *map_file);
  88	void (*map_free)(struct bpf_map *map);
  89	int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
  90	void (*map_release_uref)(struct bpf_map *map);
  91	void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
  92	int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
  93				union bpf_attr __user *uattr);
  94	int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
  95					  void *value, u64 flags);
  96	int (*map_lookup_and_delete_batch)(struct bpf_map *map,
  97					   const union bpf_attr *attr,
  98					   union bpf_attr __user *uattr);
  99	int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
 100				const union bpf_attr *attr,
 101				union bpf_attr __user *uattr);
 102	int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
 103				union bpf_attr __user *uattr);
 104
 105	/* funcs callable from userspace and from eBPF programs */
 106	void *(*map_lookup_elem)(struct bpf_map *map, void *key);
 107	long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
 108	long (*map_delete_elem)(struct bpf_map *map, void *key);
 109	long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
 110	long (*map_pop_elem)(struct bpf_map *map, void *value);
 111	long (*map_peek_elem)(struct bpf_map *map, void *value);
 112	void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
 113	int (*map_get_hash)(struct bpf_map *map, u32 hash_buf_size, void *hash_buf);
 114
 115	/* funcs called by prog_array and perf_event_array map */
 116	void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
 117				int fd);
 118	/* If need_defer is true, the implementation should guarantee that
 119	 * the to-be-put element is still alive before the bpf program, which
 120	 * may manipulate it, exists.
 121	 */
 122	void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
 123	int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
 124	u32 (*map_fd_sys_lookup_elem)(void *ptr);
 125	void (*map_seq_show_elem)(struct bpf_map *map, void *key,
 126				  struct seq_file *m);
 127	int (*map_check_btf)(const struct bpf_map *map,
 128			     const struct btf *btf,
 129			     const struct btf_type *key_type,
 130			     const struct btf_type *value_type);
 131
 132	/* Prog poke tracking helpers. */
 133	int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
 134	void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
 135	void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
 136			     struct bpf_prog *new);
 137
 138	/* Direct value access helpers. */
 139	int (*map_direct_value_addr)(const struct bpf_map *map,
 140				     u64 *imm, u32 off);
 141	int (*map_direct_value_meta)(const struct bpf_map *map,
 142				     u64 imm, u32 *off);
 143	int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
 144	__poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
 145			     struct poll_table_struct *pts);
 146	unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr,
 147					       unsigned long len, unsigned long pgoff,
 148					       unsigned long flags);
 149
 150	/* Functions called by bpf_local_storage maps */
 151	int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
 152					void *owner, u32 size);
 153	void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
 154					   void *owner, u32 size);
 155	struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
 156
 157	/* Misc helpers.*/
 158	long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
 159
 160	/* map_meta_equal must be implemented for maps that can be
 161	 * used as an inner map.  It is a runtime check to ensure
 162	 * an inner map can be inserted to an outer map.
 163	 *
 164	 * Some properties of the inner map has been used during the
 165	 * verification time.  When inserting an inner map at the runtime,
 166	 * map_meta_equal has to ensure the inserting map has the same
 167	 * properties that the verifier has used earlier.
 168	 */
 169	bool (*map_meta_equal)(const struct bpf_map *meta0,
 170			       const struct bpf_map *meta1);
 171
 172
 173	int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
 174					      struct bpf_func_state *caller,
 175					      struct bpf_func_state *callee);
 176	long (*map_for_each_callback)(struct bpf_map *map,
 177				     bpf_callback_t callback_fn,
 178				     void *callback_ctx, u64 flags);
 179
 180	u64 (*map_mem_usage)(const struct bpf_map *map);
 181
 182	/* BTF id of struct allocated by map_alloc */
 183	int *map_btf_id;
 184
 185	/* bpf_iter info used to open a seq_file */
 186	const struct bpf_iter_seq_info *iter_seq_info;
 187};
 188
 189enum {
 190	/* Support at most 11 fields in a BTF type */
 191	BTF_FIELDS_MAX	   = 11,
 192};
 193
 194enum btf_field_type {
 195	BPF_SPIN_LOCK  = (1 << 0),
 196	BPF_TIMER      = (1 << 1),
 197	BPF_KPTR_UNREF = (1 << 2),
 198	BPF_KPTR_REF   = (1 << 3),
 199	BPF_KPTR_PERCPU = (1 << 4),
 200	BPF_KPTR       = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,
 201	BPF_LIST_HEAD  = (1 << 5),
 202	BPF_LIST_NODE  = (1 << 6),
 203	BPF_RB_ROOT    = (1 << 7),
 204	BPF_RB_NODE    = (1 << 8),
 205	BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE,
 206	BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD,
 207	BPF_REFCOUNT   = (1 << 9),
 208	BPF_WORKQUEUE  = (1 << 10),
 209	BPF_UPTR       = (1 << 11),
 210	BPF_RES_SPIN_LOCK = (1 << 12),
 211	BPF_TASK_WORK  = (1 << 13),
 212};
 213
 214enum bpf_cgroup_storage_type {
 215	BPF_CGROUP_STORAGE_SHARED,
 216	BPF_CGROUP_STORAGE_PERCPU,
 217	__BPF_CGROUP_STORAGE_MAX
 218#define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
 219};
 220
 221#ifdef CONFIG_CGROUP_BPF
 222# define for_each_cgroup_storage_type(stype) \
 223	for (stype = 0; stype < MAX_BPF_CGROUP_STORAGE_TYPE; stype++)
 224#else
 225# define for_each_cgroup_storage_type(stype) for (; false; )
 226#endif /* CONFIG_CGROUP_BPF */
 227
 228typedef void (*btf_dtor_kfunc_t)(void *);
 229
 230struct btf_field_kptr {
 231	struct btf *btf;
 232	struct module *module;
 233	/* dtor used if btf_is_kernel(btf), otherwise the type is
 234	 * program-allocated, dtor is NULL,  and __bpf_obj_drop_impl is used
 235	 */
 236	btf_dtor_kfunc_t dtor;
 237	u32 btf_id;
 238};
 239
 240struct btf_field_graph_root {
 241	struct btf *btf;
 242	u32 value_btf_id;
 243	u32 node_offset;
 244	struct btf_record *value_rec;
 245};
 246
 247struct btf_field {
 248	u32 offset;
 249	u32 size;
 250	enum btf_field_type type;
 251	union {
 252		struct btf_field_kptr kptr;
 253		struct btf_field_graph_root graph_root;
 254	};
 255};
 256
 257struct btf_record {
 258	u32 cnt;
 259	u32 field_mask;
 260	int spin_lock_off;
 261	int res_spin_lock_off;
 262	int timer_off;
 263	int wq_off;
 264	int refcount_off;
 265	int task_work_off;
 266	struct btf_field fields[];
 267};
 268
 269/* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
 270struct bpf_rb_node_kern {
 271	struct rb_node rb_node;
 272	void *owner;
 273} __attribute__((aligned(8)));
 274
 275/* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
 276struct bpf_list_node_kern {
 277	struct list_head list_head;
 278	void *owner;
 279} __attribute__((aligned(8)));
 280
 281/* 'Ownership' of program-containing map is claimed by the first program
 282 * that is going to use this map or by the first program which FD is
 283 * stored in the map to make sure that all callers and callees have the
 284 * same prog type, JITed flag and xdp_has_frags flag.
 285 */
 286struct bpf_map_owner {
 287	enum bpf_prog_type type;
 288	bool jited;
 289	bool xdp_has_frags;
 290	u64 storage_cookie[MAX_BPF_CGROUP_STORAGE_TYPE];
 291	const struct btf_type *attach_func_proto;
 292	enum bpf_attach_type expected_attach_type;
 293};
 294
 295struct bpf_map {
 296	u8 sha[SHA256_DIGEST_SIZE];
 297	const struct bpf_map_ops *ops;
 298	struct bpf_map *inner_map_meta;
 299#ifdef CONFIG_SECURITY
 300	void *security;
 301#endif
 302	enum bpf_map_type map_type;
 303	u32 key_size;
 304	u32 value_size;
 305	u32 max_entries;
 306	u64 map_extra; /* any per-map-type extra fields */
 307	u32 map_flags;
 308	u32 id;
 309	struct btf_record *record;
 310	int numa_node;
 311	u32 btf_key_type_id;
 312	u32 btf_value_type_id;
 313	u32 btf_vmlinux_value_type_id;
 314	struct btf *btf;
 315#ifdef CONFIG_MEMCG
 316	struct obj_cgroup *objcg;
 317#endif
 318	char name[BPF_OBJ_NAME_LEN];
 319	struct mutex freeze_mutex;
 320	atomic64_t refcnt;
 321	atomic64_t usercnt;
 322	/* rcu is used before freeing and work is only used during freeing */
 323	union {
 324		struct work_struct work;
 325		struct rcu_head rcu;
 326	};
 327	atomic64_t writecnt;
 328	spinlock_t owner_lock;
 329	struct bpf_map_owner *owner;
 330	bool bypass_spec_v1;
 331	bool frozen; /* write-once; write-protected by freeze_mutex */
 332	bool free_after_mult_rcu_gp;
 333	bool free_after_rcu_gp;
 334	atomic64_t sleepable_refcnt;
 335	s64 __percpu *elem_count;
 336	u64 cookie; /* write-once */
 337	char *excl_prog_sha;
 338};
 339
 340static inline const char *btf_field_type_name(enum btf_field_type type)
 341{
 342	switch (type) {
 343	case BPF_SPIN_LOCK:
 344		return "bpf_spin_lock";
 345	case BPF_RES_SPIN_LOCK:
 346		return "bpf_res_spin_lock";
 347	case BPF_TIMER:
 348		return "bpf_timer";
 349	case BPF_WORKQUEUE:
 350		return "bpf_wq";
 351	case BPF_KPTR_UNREF:
 352	case BPF_KPTR_REF:
 353		return "kptr";
 354	case BPF_KPTR_PERCPU:
 355		return "percpu_kptr";
 356	case BPF_UPTR:
 357		return "uptr";
 358	case BPF_LIST_HEAD:
 359		return "bpf_list_head";
 360	case BPF_LIST_NODE:
 361		return "bpf_list_node";
 362	case BPF_RB_ROOT:
 363		return "bpf_rb_root";
 364	case BPF_RB_NODE:
 365		return "bpf_rb_node";
 366	case BPF_REFCOUNT:
 367		return "bpf_refcount";
 368	case BPF_TASK_WORK:
 369		return "bpf_task_work";
 370	default:
 371		WARN_ON_ONCE(1);
 372		return "unknown";
 373	}
 374}
 375
 376#if IS_ENABLED(CONFIG_DEBUG_KERNEL)
 377#define BPF_WARN_ONCE(cond, format...) WARN_ONCE(cond, format)
 378#else
 379#define BPF_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
 380#endif
 381
 382static inline u32 btf_field_type_size(enum btf_field_type type)
 383{
 384	switch (type) {
 385	case BPF_SPIN_LOCK:
 386		return sizeof(struct bpf_spin_lock);
 387	case BPF_RES_SPIN_LOCK:
 388		return sizeof(struct bpf_res_spin_lock);
 389	case BPF_TIMER:
 390		return sizeof(struct bpf_timer);
 391	case BPF_WORKQUEUE:
 392		return sizeof(struct bpf_wq);
 393	case BPF_KPTR_UNREF:
 394	case BPF_KPTR_REF:
 395	case BPF_KPTR_PERCPU:
 396	case BPF_UPTR:
 397		return sizeof(u64);
 398	case BPF_LIST_HEAD:
 399		return sizeof(struct bpf_list_head);
 400	case BPF_LIST_NODE:
 401		return sizeof(struct bpf_list_node);
 402	case BPF_RB_ROOT:
 403		return sizeof(struct bpf_rb_root);
 404	case BPF_RB_NODE:
 405		return sizeof(struct bpf_rb_node);
 406	case BPF_REFCOUNT:
 407		return sizeof(struct bpf_refcount);
 408	case BPF_TASK_WORK:
 409		return sizeof(struct bpf_task_work);
 410	default:
 411		WARN_ON_ONCE(1);
 412		return 0;
 413	}
 414}
 415
 416static inline u32 btf_field_type_align(enum btf_field_type type)
 417{
 418	switch (type) {
 419	case BPF_SPIN_LOCK:
 420		return __alignof__(struct bpf_spin_lock);
 421	case BPF_RES_SPIN_LOCK:
 422		return __alignof__(struct bpf_res_spin_lock);
 423	case BPF_TIMER:
 424		return __alignof__(struct bpf_timer);
 425	case BPF_WORKQUEUE:
 426		return __alignof__(struct bpf_wq);
 427	case BPF_KPTR_UNREF:
 428	case BPF_KPTR_REF:
 429	case BPF_KPTR_PERCPU:
 430	case BPF_UPTR:
 431		return __alignof__(u64);
 432	case BPF_LIST_HEAD:
 433		return __alignof__(struct bpf_list_head);
 434	case BPF_LIST_NODE:
 435		return __alignof__(struct bpf_list_node);
 436	case BPF_RB_ROOT:
 437		return __alignof__(struct bpf_rb_root);
 438	case BPF_RB_NODE:
 439		return __alignof__(struct bpf_rb_node);
 440	case BPF_REFCOUNT:
 441		return __alignof__(struct bpf_refcount);
 442	case BPF_TASK_WORK:
 443		return __alignof__(struct bpf_task_work);
 444	default:
 445		WARN_ON_ONCE(1);
 446		return 0;
 447	}
 448}
 449
 450static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
 451{
 452	memset(addr, 0, field->size);
 453
 454	switch (field->type) {
 455	case BPF_REFCOUNT:
 456		refcount_set((refcount_t *)addr, 1);
 457		break;
 458	case BPF_RB_NODE:
 459		RB_CLEAR_NODE((struct rb_node *)addr);
 460		break;
 461	case BPF_LIST_HEAD:
 462	case BPF_LIST_NODE:
 463		INIT_LIST_HEAD((struct list_head *)addr);
 464		break;
 465	case BPF_RB_ROOT:
 466		/* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
 467	case BPF_SPIN_LOCK:
 468	case BPF_RES_SPIN_LOCK:
 469	case BPF_TIMER:
 470	case BPF_WORKQUEUE:
 471	case BPF_KPTR_UNREF:
 472	case BPF_KPTR_REF:
 473	case BPF_KPTR_PERCPU:
 474	case BPF_UPTR:
 475	case BPF_TASK_WORK:
 476		break;
 477	default:
 478		WARN_ON_ONCE(1);
 479		return;
 480	}
 481}
 482
 483static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
 484{
 485	if (IS_ERR_OR_NULL(rec))
 486		return false;
 487	return rec->field_mask & type;
 488}
 489
 490static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
 491{
 492	int i;
 493
 494	if (IS_ERR_OR_NULL(rec))
 495		return;
 496	for (i = 0; i < rec->cnt; i++)
 497		bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
 498}
 499
 500/* 'dst' must be a temporary buffer and should not point to memory that is being
 501 * used in parallel by a bpf program or bpf syscall, otherwise the access from
 502 * the bpf program or bpf syscall may be corrupted by the reinitialization,
 503 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
 504 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
 505 * program or bpf syscall.
 506 */
 507static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
 508{
 509	bpf_obj_init(map->record, dst);
 510}
 511
 512/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
 513 * forced to use 'long' read/writes to try to atomically copy long counters.
 514 * Best-effort only.  No barriers here, since it _will_ race with concurrent
 515 * updates from BPF programs. Called from bpf syscall and mostly used with
 516 * size 8 or 16 bytes, so ask compiler to inline it.
 517 */
 518static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
 519{
 520	const long *lsrc = src;
 521	long *ldst = dst;
 522
 523	size /= sizeof(long);
 524	while (size--)
 525		data_race(*ldst++ = *lsrc++);
 526}
 527
 528/* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
 529static inline void bpf_obj_memcpy(struct btf_record *rec,
 530				  void *dst, void *src, u32 size,
 531				  bool long_memcpy)
 532{
 533	u32 curr_off = 0;
 534	int i;
 535
 536	if (IS_ERR_OR_NULL(rec)) {
 537		if (long_memcpy)
 538			bpf_long_memcpy(dst, src, round_up(size, 8));
 539		else
 540			memcpy(dst, src, size);
 541		return;
 542	}
 543
 544	for (i = 0; i < rec->cnt; i++) {
 545		u32 next_off = rec->fields[i].offset;
 546		u32 sz = next_off - curr_off;
 547
 548		memcpy(dst + curr_off, src + curr_off, sz);
 549		curr_off += rec->fields[i].size + sz;
 550	}
 551	memcpy(dst + curr_off, src + curr_off, size - curr_off);
 552}
 553
 554static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
 555{
 556	bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
 557}
 558
 559static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
 560{
 561	bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
 562}
 563
 564static inline void bpf_obj_swap_uptrs(const struct btf_record *rec, void *dst, void *src)
 565{
 566	unsigned long *src_uptr, *dst_uptr;
 567	const struct btf_field *field;
 568	int i;
 569
 570	if (!btf_record_has_field(rec, BPF_UPTR))
 571		return;
 572
 573	for (i = 0, field = rec->fields; i < rec->cnt; i++, field++) {
 574		if (field->type != BPF_UPTR)
 575			continue;
 576
 577		src_uptr = src + field->offset;
 578		dst_uptr = dst + field->offset;
 579		swap(*src_uptr, *dst_uptr);
 580	}
 581}
 582
 583static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
 584{
 585	u32 curr_off = 0;
 586	int i;
 587
 588	if (IS_ERR_OR_NULL(rec)) {
 589		memset(dst, 0, size);
 590		return;
 591	}
 592
 593	for (i = 0; i < rec->cnt; i++) {
 594		u32 next_off = rec->fields[i].offset;
 595		u32 sz = next_off - curr_off;
 596
 597		memset(dst + curr_off, 0, sz);
 598		curr_off += rec->fields[i].size + sz;
 599	}
 600	memset(dst + curr_off, 0, size - curr_off);
 601}
 602
 603static inline void zero_map_value(struct bpf_map *map, void *dst)
 604{
 605	bpf_obj_memzero(map->record, dst, map->value_size);
 606}
 607
 608void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
 609			   bool lock_src);
 610void bpf_timer_cancel_and_free(void *timer);
 611void bpf_wq_cancel_and_free(void *timer);
 612void bpf_task_work_cancel_and_free(void *timer);
 613void bpf_list_head_free(const struct btf_field *field, void *list_head,
 614			struct bpf_spin_lock *spin_lock);
 615void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
 616		      struct bpf_spin_lock *spin_lock);
 617u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena);
 618u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena);
 619int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
 620
 621struct bpf_offload_dev;
 622struct bpf_offloaded_map;
 623
 624struct bpf_map_dev_ops {
 625	int (*map_get_next_key)(struct bpf_offloaded_map *map,
 626				void *key, void *next_key);
 627	int (*map_lookup_elem)(struct bpf_offloaded_map *map,
 628			       void *key, void *value);
 629	int (*map_update_elem)(struct bpf_offloaded_map *map,
 630			       void *key, void *value, u64 flags);
 631	int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
 632};
 633
 634struct bpf_offloaded_map {
 635	struct bpf_map map;
 636	struct net_device *netdev;
 637	const struct bpf_map_dev_ops *dev_ops;
 638	void *dev_priv;
 639	struct list_head offloads;
 640};
 641
 642static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
 643{
 644	return container_of(map, struct bpf_offloaded_map, map);
 645}
 646
 647static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
 648{
 649	return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
 650}
 651
 652static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
 653{
 654	return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
 655		map->ops->map_seq_show_elem;
 656}
 657
 658int map_check_no_btf(const struct bpf_map *map,
 659		     const struct btf *btf,
 660		     const struct btf_type *key_type,
 661		     const struct btf_type *value_type);
 662
 663bool bpf_map_meta_equal(const struct bpf_map *meta0,
 664			const struct bpf_map *meta1);
 665
 666static inline bool bpf_map_has_internal_structs(struct bpf_map *map)
 667{
 668	return btf_record_has_field(map->record, BPF_TIMER | BPF_WORKQUEUE | BPF_TASK_WORK);
 669}
 670
 671void bpf_map_free_internal_structs(struct bpf_map *map, void *obj);
 672
 673int bpf_dynptr_from_file_sleepable(struct file *file, u32 flags,
 674				   struct bpf_dynptr *ptr__uninit);
 675
 676extern const struct bpf_map_ops bpf_map_offload_ops;
 677
 678/* bpf_type_flag contains a set of flags that are applicable to the values of
 679 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
 680 * or a memory is read-only. We classify types into two categories: base types
 681 * and extended types. Extended types are base types combined with a type flag.
 682 *
 683 * Currently there are no more than 32 base types in arg_type, ret_type and
 684 * reg_types.
 685 */
 686#define BPF_BASE_TYPE_BITS	8
 687
 688enum bpf_type_flag {
 689	/* PTR may be NULL. */
 690	PTR_MAYBE_NULL		= BIT(0 + BPF_BASE_TYPE_BITS),
 691
 692	/* MEM is read-only. When applied on bpf_arg, it indicates the arg is
 693	 * compatible with both mutable and immutable memory.
 694	 */
 695	MEM_RDONLY		= BIT(1 + BPF_BASE_TYPE_BITS),
 696
 697	/* MEM points to BPF ring buffer reservation. */
 698	MEM_RINGBUF		= BIT(2 + BPF_BASE_TYPE_BITS),
 699
 700	/* MEM is in user address space. */
 701	MEM_USER		= BIT(3 + BPF_BASE_TYPE_BITS),
 702
 703	/* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
 704	 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
 705	 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
 706	 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
 707	 * to the specified cpu.
 708	 */
 709	MEM_PERCPU		= BIT(4 + BPF_BASE_TYPE_BITS),
 710
 711	/* Indicates that the argument will be released. */
 712	OBJ_RELEASE		= BIT(5 + BPF_BASE_TYPE_BITS),
 713
 714	/* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
 715	 * unreferenced and referenced kptr loaded from map value using a load
 716	 * instruction, so that they can only be dereferenced but not escape the
 717	 * BPF program into the kernel (i.e. cannot be passed as arguments to
 718	 * kfunc or bpf helpers).
 719	 */
 720	PTR_UNTRUSTED		= BIT(6 + BPF_BASE_TYPE_BITS),
 721
 722	/* MEM can be uninitialized. */
 723	MEM_UNINIT		= BIT(7 + BPF_BASE_TYPE_BITS),
 724
 725	/* DYNPTR points to memory local to the bpf program. */
 726	DYNPTR_TYPE_LOCAL	= BIT(8 + BPF_BASE_TYPE_BITS),
 727
 728	/* DYNPTR points to a kernel-produced ringbuf record. */
 729	DYNPTR_TYPE_RINGBUF	= BIT(9 + BPF_BASE_TYPE_BITS),
 730
 731	/* Size is known at compile time. */
 732	MEM_FIXED_SIZE		= BIT(10 + BPF_BASE_TYPE_BITS),
 733
 734	/* MEM is of an allocated object of type in program BTF. This is used to
 735	 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
 736	 */
 737	MEM_ALLOC		= BIT(11 + BPF_BASE_TYPE_BITS),
 738
 739	/* PTR was passed from the kernel in a trusted context, and may be
 740	 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
 741	 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
 742	 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
 743	 * without invoking bpf_kptr_xchg(). What we really need to know is
 744	 * whether a pointer is safe to pass to a kfunc or BPF helper function.
 745	 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
 746	 * helpers, they do not cover all possible instances of unsafe
 747	 * pointers. For example, a pointer that was obtained from walking a
 748	 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
 749	 * fact that it may be NULL, invalid, etc. This is due to backwards
 750	 * compatibility requirements, as this was the behavior that was first
 751	 * introduced when kptrs were added. The behavior is now considered
 752	 * deprecated, and PTR_UNTRUSTED will eventually be removed.
 753	 *
 754	 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
 755	 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
 756	 * For example, pointers passed to tracepoint arguments are considered
 757	 * PTR_TRUSTED, as are pointers that are passed to struct_ops
 758	 * callbacks. As alluded to above, pointers that are obtained from
 759	 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
 760	 * struct task_struct *task is PTR_TRUSTED, then accessing
 761	 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
 762	 * in a BPF register. Similarly, pointers passed to certain programs
 763	 * types such as kretprobes are not guaranteed to be valid, as they may
 764	 * for example contain an object that was recently freed.
 765	 */
 766	PTR_TRUSTED		= BIT(12 + BPF_BASE_TYPE_BITS),
 767
 768	/* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
 769	MEM_RCU			= BIT(13 + BPF_BASE_TYPE_BITS),
 770
 771	/* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
 772	 * Currently only valid for linked-list and rbtree nodes. If the nodes
 773	 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
 774	 */
 775	NON_OWN_REF		= BIT(14 + BPF_BASE_TYPE_BITS),
 776
 777	/* DYNPTR points to sk_buff */
 778	DYNPTR_TYPE_SKB		= BIT(15 + BPF_BASE_TYPE_BITS),
 779
 780	/* DYNPTR points to xdp_buff */
 781	DYNPTR_TYPE_XDP		= BIT(16 + BPF_BASE_TYPE_BITS),
 782
 783	/* Memory must be aligned on some architectures, used in combination with
 784	 * MEM_FIXED_SIZE.
 785	 */
 786	MEM_ALIGNED		= BIT(17 + BPF_BASE_TYPE_BITS),
 787
 788	/* MEM is being written to, often combined with MEM_UNINIT. Non-presence
 789	 * of MEM_WRITE means that MEM is only being read. MEM_WRITE without the
 790	 * MEM_UNINIT means that memory needs to be initialized since it is also
 791	 * read.
 792	 */
 793	MEM_WRITE		= BIT(18 + BPF_BASE_TYPE_BITS),
 794
 795	/* DYNPTR points to skb_metadata_end()-skb_metadata_len() */
 796	DYNPTR_TYPE_SKB_META	= BIT(19 + BPF_BASE_TYPE_BITS),
 797
 798	/* DYNPTR points to file */
 799	DYNPTR_TYPE_FILE	= BIT(20 + BPF_BASE_TYPE_BITS),
 800
 801	__BPF_TYPE_FLAG_MAX,
 802	__BPF_TYPE_LAST_FLAG	= __BPF_TYPE_FLAG_MAX - 1,
 803};
 804
 805#define DYNPTR_TYPE_FLAG_MASK	(DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
 806				 | DYNPTR_TYPE_XDP | DYNPTR_TYPE_SKB_META | DYNPTR_TYPE_FILE)
 807
 808/* Max number of base types. */
 809#define BPF_BASE_TYPE_LIMIT	(1UL << BPF_BASE_TYPE_BITS)
 810
 811/* Max number of all types. */
 812#define BPF_TYPE_LIMIT		(__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
 813
 814/* function argument constraints */
 815enum bpf_arg_type {
 816	ARG_DONTCARE = 0,	/* unused argument in helper function */
 817
 818	/* the following constraints used to prototype
 819	 * bpf_map_lookup/update/delete_elem() functions
 820	 */
 821	ARG_CONST_MAP_PTR,	/* const argument used as pointer to bpf_map */
 822	ARG_PTR_TO_MAP_KEY,	/* pointer to stack used as map key */
 823	ARG_PTR_TO_MAP_VALUE,	/* pointer to stack used as map value */
 824
 825	/* Used to prototype bpf_memcmp() and other functions that access data
 826	 * on eBPF program stack
 827	 */
 828	ARG_PTR_TO_MEM,		/* pointer to valid memory (stack, packet, map value) */
 829	ARG_PTR_TO_ARENA,
 830
 831	ARG_CONST_SIZE,		/* number of bytes accessed from memory */
 832	ARG_CONST_SIZE_OR_ZERO,	/* number of bytes accessed from memory or 0 */
 833
 834	ARG_PTR_TO_CTX,		/* pointer to context */
 835	ARG_ANYTHING,		/* any (initialized) argument is ok */
 836	ARG_PTR_TO_SPIN_LOCK,	/* pointer to bpf_spin_lock */
 837	ARG_PTR_TO_SOCK_COMMON,	/* pointer to sock_common */
 838	ARG_PTR_TO_SOCKET,	/* pointer to bpf_sock (fullsock) */
 839	ARG_PTR_TO_BTF_ID,	/* pointer to in-kernel struct */
 840	ARG_PTR_TO_RINGBUF_MEM,	/* pointer to dynamically reserved ringbuf memory */
 841	ARG_CONST_ALLOC_SIZE_OR_ZERO,	/* number of allocated bytes requested */
 842	ARG_PTR_TO_BTF_ID_SOCK_COMMON,	/* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
 843	ARG_PTR_TO_PERCPU_BTF_ID,	/* pointer to in-kernel percpu type */
 844	ARG_PTR_TO_FUNC,	/* pointer to a bpf program function */
 845	ARG_PTR_TO_STACK,	/* pointer to stack */
 846	ARG_PTR_TO_CONST_STR,	/* pointer to a null terminated read-only string */
 847	ARG_PTR_TO_TIMER,	/* pointer to bpf_timer */
 848	ARG_KPTR_XCHG_DEST,	/* pointer to destination that kptrs are bpf_kptr_xchg'd into */
 849	ARG_PTR_TO_DYNPTR,      /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
 850	__BPF_ARG_TYPE_MAX,
 851
 852	/* Extended arg_types. */
 853	ARG_PTR_TO_MAP_VALUE_OR_NULL	= PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
 854	ARG_PTR_TO_MEM_OR_NULL		= PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
 855	ARG_PTR_TO_CTX_OR_NULL		= PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
 856	ARG_PTR_TO_SOCKET_OR_NULL	= PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
 857	ARG_PTR_TO_STACK_OR_NULL	= PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
 858	ARG_PTR_TO_BTF_ID_OR_NULL	= PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
 859	/* Pointer to memory does not need to be initialized, since helper function
 860	 * fills all bytes or clears them in error case.
 861	 */
 862	ARG_PTR_TO_UNINIT_MEM		= MEM_UNINIT | MEM_WRITE | ARG_PTR_TO_MEM,
 863	/* Pointer to valid memory of size known at compile time. */
 864	ARG_PTR_TO_FIXED_SIZE_MEM	= MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
 865
 866	/* This must be the last entry. Its purpose is to ensure the enum is
 867	 * wide enough to hold the higher bits reserved for bpf_type_flag.
 868	 */
 869	__BPF_ARG_TYPE_LIMIT	= BPF_TYPE_LIMIT,
 870};
 871static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
 872
 873/* type of values returned from helper functions */
 874enum bpf_return_type {
 875	RET_INTEGER,			/* function returns integer */
 876	RET_VOID,			/* function doesn't return anything */
 877	RET_PTR_TO_MAP_VALUE,		/* returns a pointer to map elem value */
 878	RET_PTR_TO_SOCKET,		/* returns a pointer to a socket */
 879	RET_PTR_TO_TCP_SOCK,		/* returns a pointer to a tcp_sock */
 880	RET_PTR_TO_SOCK_COMMON,		/* returns a pointer to a sock_common */
 881	RET_PTR_TO_MEM,			/* returns a pointer to memory */
 882	RET_PTR_TO_MEM_OR_BTF_ID,	/* returns a pointer to a valid memory or a btf_id */
 883	RET_PTR_TO_BTF_ID,		/* returns a pointer to a btf_id */
 884	__BPF_RET_TYPE_MAX,
 885
 886	/* Extended ret_types. */
 887	RET_PTR_TO_MAP_VALUE_OR_NULL	= PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
 888	RET_PTR_TO_SOCKET_OR_NULL	= PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
 889	RET_PTR_TO_TCP_SOCK_OR_NULL	= PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
 890	RET_PTR_TO_SOCK_COMMON_OR_NULL	= PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
 891	RET_PTR_TO_RINGBUF_MEM_OR_NULL	= PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
 892	RET_PTR_TO_DYNPTR_MEM_OR_NULL	= PTR_MAYBE_NULL | RET_PTR_TO_MEM,
 893	RET_PTR_TO_BTF_ID_OR_NULL	= PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
 894	RET_PTR_TO_BTF_ID_TRUSTED	= PTR_TRUSTED	 | RET_PTR_TO_BTF_ID,
 895
 896	/* This must be the last entry. Its purpose is to ensure the enum is
 897	 * wide enough to hold the higher bits reserved for bpf_type_flag.
 898	 */
 899	__BPF_RET_TYPE_LIMIT	= BPF_TYPE_LIMIT,
 900};
 901static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
 902
 903/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 904 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 905 * instructions after verifying
 906 */
 907struct bpf_func_proto {
 908	u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 909	bool gpl_only;
 910	bool pkt_access;
 911	bool might_sleep;
 912	/* set to true if helper follows contract for llvm
 913	 * attribute bpf_fastcall:
 914	 * - void functions do not scratch r0
 915	 * - functions taking N arguments scratch only registers r1-rN
 916	 */
 917	bool allow_fastcall;
 918	enum bpf_return_type ret_type;
 919	union {
 920		struct {
 921			enum bpf_arg_type arg1_type;
 922			enum bpf_arg_type arg2_type;
 923			enum bpf_arg_type arg3_type;
 924			enum bpf_arg_type arg4_type;
 925			enum bpf_arg_type arg5_type;
 926		};
 927		enum bpf_arg_type arg_type[5];
 928	};
 929	union {
 930		struct {
 931			u32 *arg1_btf_id;
 932			u32 *arg2_btf_id;
 933			u32 *arg3_btf_id;
 934			u32 *arg4_btf_id;
 935			u32 *arg5_btf_id;
 936		};
 937		u32 *arg_btf_id[5];
 938		struct {
 939			size_t arg1_size;
 940			size_t arg2_size;
 941			size_t arg3_size;
 942			size_t arg4_size;
 943			size_t arg5_size;
 944		};
 945		size_t arg_size[5];
 946	};
 947	int *ret_btf_id; /* return value btf_id */
 948	bool (*allowed)(const struct bpf_prog *prog);
 949};
 950
 951/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 952 * the first argument to eBPF programs.
 953 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 954 */
 955struct bpf_context;
 956
 957enum bpf_access_type {
 958	BPF_READ = 1,
 959	BPF_WRITE = 2
 960};
 961
 962/* types of values stored in eBPF registers */
 963/* Pointer types represent:
 964 * pointer
 965 * pointer + imm
 966 * pointer + (u16) var
 967 * pointer + (u16) var + imm
 968 * if (range > 0) then [ptr, ptr + range - off) is safe to access
 969 * if (id > 0) means that some 'var' was added
 970 * if (off > 0) means that 'imm' was added
 971 */
 972enum bpf_reg_type {
 973	NOT_INIT = 0,		 /* nothing was written into register */
 974	SCALAR_VALUE,		 /* reg doesn't contain a valid pointer */
 975	PTR_TO_CTX,		 /* reg points to bpf_context */
 976	CONST_PTR_TO_MAP,	 /* reg points to struct bpf_map */
 977	PTR_TO_MAP_VALUE,	 /* reg points to map element value */
 978	PTR_TO_MAP_KEY,		 /* reg points to a map element key */
 979	PTR_TO_STACK,		 /* reg == frame_pointer + offset */
 980	PTR_TO_PACKET_META,	 /* skb->data - meta_len */
 981	PTR_TO_PACKET,		 /* reg points to skb->data */
 982	PTR_TO_PACKET_END,	 /* skb->data + headlen */
 983	PTR_TO_FLOW_KEYS,	 /* reg points to bpf_flow_keys */
 984	PTR_TO_SOCKET,		 /* reg points to struct bpf_sock */
 985	PTR_TO_SOCK_COMMON,	 /* reg points to sock_common */
 986	PTR_TO_TCP_SOCK,	 /* reg points to struct tcp_sock */
 987	PTR_TO_TP_BUFFER,	 /* reg points to a writable raw tp's buffer */
 988	PTR_TO_XDP_SOCK,	 /* reg points to struct xdp_sock */
 989	/* PTR_TO_BTF_ID points to a kernel struct that does not need
 990	 * to be null checked by the BPF program. This does not imply the
 991	 * pointer is _not_ null and in practice this can easily be a null
 992	 * pointer when reading pointer chains. The assumption is program
 993	 * context will handle null pointer dereference typically via fault
 994	 * handling. The verifier must keep this in mind and can make no
 995	 * assumptions about null or non-null when doing branch analysis.
 996	 * Further, when passed into helpers the helpers can not, without
 997	 * additional context, assume the value is non-null.
 998	 */
 999	PTR_TO_BTF_ID,
1000	PTR_TO_MEM,		 /* reg points to valid memory region */
1001	PTR_TO_ARENA,
1002	PTR_TO_BUF,		 /* reg points to a read/write buffer */
1003	PTR_TO_FUNC,		 /* reg points to a bpf program function */
1004	PTR_TO_INSN,		 /* reg points to a bpf program instruction */
1005	CONST_PTR_TO_DYNPTR,	 /* reg points to a const struct bpf_dynptr */
1006	__BPF_REG_TYPE_MAX,
1007
1008	/* Extended reg_types. */
1009	PTR_TO_MAP_VALUE_OR_NULL	= PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
1010	PTR_TO_SOCKET_OR_NULL		= PTR_MAYBE_NULL | PTR_TO_SOCKET,
1011	PTR_TO_SOCK_COMMON_OR_NULL	= PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
1012	PTR_TO_TCP_SOCK_OR_NULL		= PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
1013	/* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
1014	 * been checked for null. Used primarily to inform the verifier
1015	 * an explicit null check is required for this struct.
1016	 */
1017	PTR_TO_BTF_ID_OR_NULL		= PTR_MAYBE_NULL | PTR_TO_BTF_ID,
1018
1019	/* This must be the last entry. Its purpose is to ensure the enum is
1020	 * wide enough to hold the higher bits reserved for bpf_type_flag.
1021	 */
1022	__BPF_REG_TYPE_LIMIT	= BPF_TYPE_LIMIT,
1023};
1024static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
1025
1026/* The information passed from prog-specific *_is_valid_access
1027 * back to the verifier.
1028 */
1029struct bpf_insn_access_aux {
1030	enum bpf_reg_type reg_type;
1031	bool is_ldsx;
1032	union {
1033		int ctx_field_size;
1034		struct {
1035			struct btf *btf;
1036			u32 btf_id;
1037			u32 ref_obj_id;
1038		};
1039	};
1040	struct bpf_verifier_log *log; /* for verbose logs */
1041	bool is_retval; /* is accessing function return value ? */
1042};
1043
1044static inline void
1045bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
1046{
1047	aux->ctx_field_size = size;
1048}
1049
1050static bool bpf_is_ldimm64(const struct bpf_insn *insn)
1051{
1052	return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
1053}
1054
1055static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
1056{
1057	return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
1058}
1059
1060/* Given a BPF_ATOMIC instruction @atomic_insn, return true if it is an
1061 * atomic load or store, and false if it is a read-modify-write instruction.
1062 */
1063static inline bool
1064bpf_atomic_is_load_store(const struct bpf_insn *atomic_insn)
1065{
1066	switch (atomic_insn->imm) {
1067	case BPF_LOAD_ACQ:
1068	case BPF_STORE_REL:
1069		return true;
1070	default:
1071		return false;
1072	}
1073}
1074
1075struct bpf_prog_ops {
1076	int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
1077			union bpf_attr __user *uattr);
1078};
1079
1080struct bpf_reg_state;
1081struct bpf_verifier_ops {
1082	/* return eBPF function prototype for verification */
1083	const struct bpf_func_proto *
1084	(*get_func_proto)(enum bpf_func_id func_id,
1085			  const struct bpf_prog *prog);
1086
1087	/* return true if 'size' wide access at offset 'off' within bpf_context
1088	 * with 'type' (read or write) is allowed
1089	 */
1090	bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
1091				const struct bpf_prog *prog,
1092				struct bpf_insn_access_aux *info);
1093	int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
1094			    const struct bpf_prog *prog);
1095	int (*gen_epilogue)(struct bpf_insn *insn, const struct bpf_prog *prog,
1096			    s16 ctx_stack_off);
1097	int (*gen_ld_abs)(const struct bpf_insn *orig,
1098			  struct bpf_insn *insn_buf);
1099	u32 (*convert_ctx_access)(enum bpf_access_type type,
1100				  const struct bpf_insn *src,
1101				  struct bpf_insn *dst,
1102				  struct bpf_prog *prog, u32 *target_size);
1103	int (*btf_struct_access)(struct bpf_verifier_log *log,
1104				 const struct bpf_reg_state *reg,
1105				 int off, int size);
1106};
1107
1108struct bpf_prog_offload_ops {
1109	/* verifier basic callbacks */
1110	int (*insn_hook)(struct bpf_verifier_env *env,
1111			 int insn_idx, int prev_insn_idx);
1112	int (*finalize)(struct bpf_verifier_env *env);
1113	/* verifier optimization callbacks (called after .finalize) */
1114	int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
1115			    struct bpf_insn *insn);
1116	int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
1117	/* program management callbacks */
1118	int (*prepare)(struct bpf_prog *prog);
1119	int (*translate)(struct bpf_prog *prog);
1120	void (*destroy)(struct bpf_prog *prog);
1121};
1122
1123struct bpf_prog_offload {
1124	struct bpf_prog		*prog;
1125	struct net_device	*netdev;
1126	struct bpf_offload_dev	*offdev;
1127	void			*dev_priv;
1128	struct list_head	offloads;
1129	bool			dev_state;
1130	bool			opt_failed;
1131	void			*jited_image;
1132	u32			jited_len;
1133};
1134
1135/* The longest tracepoint has 12 args.
1136 * See include/trace/bpf_probe.h
1137 */
1138#define MAX_BPF_FUNC_ARGS 12
1139
1140/* The maximum number of arguments passed through registers
1141 * a single function may have.
1142 */
1143#define MAX_BPF_FUNC_REG_ARGS 5
1144
1145/* The argument is a structure or a union. */
1146#define BTF_FMODEL_STRUCT_ARG		BIT(0)
1147
1148/* The argument is signed. */
1149#define BTF_FMODEL_SIGNED_ARG		BIT(1)
1150
1151struct btf_func_model {
1152	u8 ret_size;
1153	u8 ret_flags;
1154	u8 nr_args;
1155	u8 arg_size[MAX_BPF_FUNC_ARGS];
1156	u8 arg_flags[MAX_BPF_FUNC_ARGS];
1157};
1158
1159/* Restore arguments before returning from trampoline to let original function
1160 * continue executing. This flag is used for fentry progs when there are no
1161 * fexit progs.
1162 */
1163#define BPF_TRAMP_F_RESTORE_REGS	BIT(0)
1164/* Call original function after fentry progs, but before fexit progs.
1165 * Makes sense for fentry/fexit, normal calls and indirect calls.
1166 */
1167#define BPF_TRAMP_F_CALL_ORIG		BIT(1)
1168/* Skip current frame and return to parent.  Makes sense for fentry/fexit
1169 * programs only. Should not be used with normal calls and indirect calls.
1170 */
1171#define BPF_TRAMP_F_SKIP_FRAME		BIT(2)
1172/* Store IP address of the caller on the trampoline stack,
1173 * so it's available for trampoline's programs.
1174 */
1175#define BPF_TRAMP_F_IP_ARG		BIT(3)
1176/* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1177#define BPF_TRAMP_F_RET_FENTRY_RET	BIT(4)
1178
1179/* Get original function from stack instead of from provided direct address.
1180 * Makes sense for trampolines with fexit or fmod_ret programs.
1181 */
1182#define BPF_TRAMP_F_ORIG_STACK		BIT(5)
1183
1184/* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1185 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1186 */
1187#define BPF_TRAMP_F_SHARE_IPMODIFY	BIT(6)
1188
1189/* Indicate that current trampoline is in a tail call context. Then, it has to
1190 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1191 */
1192#define BPF_TRAMP_F_TAIL_CALL_CTX	BIT(7)
1193
1194/*
1195 * Indicate the trampoline should be suitable to receive indirect calls;
1196 * without this indirectly calling the generated code can result in #UD/#CP,
1197 * depending on the CFI options.
1198 *
1199 * Used by bpf_struct_ops.
1200 *
1201 * Incompatible with FENTRY usage, overloads @func_addr argument.
1202 */
1203#define BPF_TRAMP_F_INDIRECT		BIT(8)
1204
1205/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1206 * bytes on x86.
1207 */
1208enum {
1209#if defined(__s390x__)
1210	BPF_MAX_TRAMP_LINKS = 27,
1211#else
1212	BPF_MAX_TRAMP_LINKS = 38,
1213#endif
1214};
1215
1216struct bpf_tramp_links {
1217	struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1218	int nr_links;
1219};
1220
1221struct bpf_tramp_run_ctx;
1222
1223/* Different use cases for BPF trampoline:
1224 * 1. replace nop at the function entry (kprobe equivalent)
1225 *    flags = BPF_TRAMP_F_RESTORE_REGS
1226 *    fentry = a set of programs to run before returning from trampoline
1227 *
1228 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1229 *    flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1230 *    orig_call = fentry_ip + MCOUNT_INSN_SIZE
1231 *    fentry = a set of program to run before calling original function
1232 *    fexit = a set of program to run after original function
1233 *
1234 * 3. replace direct call instruction anywhere in the function body
1235 *    or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1236 *    With flags = 0
1237 *      fentry = a set of programs to run before returning from trampoline
1238 *    With flags = BPF_TRAMP_F_CALL_ORIG
1239 *      orig_call = original callback addr or direct function addr
1240 *      fentry = a set of program to run before calling original function
1241 *      fexit = a set of program to run after original function
1242 */
1243struct bpf_tramp_image;
1244int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,
1245				const struct btf_func_model *m, u32 flags,
1246				struct bpf_tramp_links *tlinks,
1247				void *func_addr);
1248void *arch_alloc_bpf_trampoline(unsigned int size);
1249void arch_free_bpf_trampoline(void *image, unsigned int size);
1250int __must_check arch_protect_bpf_trampoline(void *image, unsigned int size);
1251int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
1252			     struct bpf_tramp_links *tlinks, void *func_addr);
1253
1254u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1255					     struct bpf_tramp_run_ctx *run_ctx);
1256void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1257					     struct bpf_tramp_run_ctx *run_ctx);
1258void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1259void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1260typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1261				      struct bpf_tramp_run_ctx *run_ctx);
1262typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1263				      struct bpf_tramp_run_ctx *run_ctx);
1264bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1265bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1266
1267#ifdef CONFIG_DYNAMIC_FTRACE_WITH_JMP
1268static inline bool bpf_trampoline_use_jmp(u64 flags)
1269{
1270	return flags & BPF_TRAMP_F_CALL_ORIG && !(flags & BPF_TRAMP_F_SKIP_FRAME);
1271}
1272#else
1273static inline bool bpf_trampoline_use_jmp(u64 flags)
1274{
1275	return false;
1276}
1277#endif
1278
1279struct bpf_ksym {
1280	unsigned long		 start;
1281	unsigned long		 end;
1282	char			 name[KSYM_NAME_LEN];
1283	struct list_head	 lnode;
1284	struct latch_tree_node	 tnode;
1285	bool			 prog;
1286	u32			 fp_start;
1287	u32			 fp_end;
1288};
1289
1290enum bpf_tramp_prog_type {
1291	BPF_TRAMP_FENTRY,
1292	BPF_TRAMP_FEXIT,
1293	BPF_TRAMP_MODIFY_RETURN,
1294	BPF_TRAMP_MAX,
1295	BPF_TRAMP_REPLACE, /* more than MAX */
1296};
1297
1298struct bpf_tramp_image {
1299	void *image;
1300	int size;
1301	struct bpf_ksym ksym;
1302	struct percpu_ref pcref;
1303	void *ip_after_call;
1304	void *ip_epilogue;
1305	union {
1306		struct rcu_head rcu;
1307		struct work_struct work;
1308	};
1309};
1310
1311struct bpf_trampoline {
1312	/* hlist for trampoline_table */
1313	struct hlist_node hlist;
1314	struct ftrace_ops *fops;
1315	/* serializes access to fields of this trampoline */
1316	struct mutex mutex;
1317	refcount_t refcnt;
1318	u32 flags;
1319	u64 key;
1320	struct {
1321		struct btf_func_model model;
1322		void *addr;
1323		bool ftrace_managed;
1324	} func;
1325	/* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1326	 * program by replacing one of its functions. func.addr is the address
1327	 * of the function it replaced.
1328	 */
1329	struct bpf_prog *extension_prog;
1330	/* list of BPF programs using this trampoline */
1331	struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1332	/* Number of attached programs. A counter per kind. */
1333	int progs_cnt[BPF_TRAMP_MAX];
1334	/* Executable image of trampoline */
1335	struct bpf_tramp_image *cur_image;
1336};
1337
1338struct bpf_attach_target_info {
1339	struct btf_func_model fmodel;
1340	long tgt_addr;
1341	struct module *tgt_mod;
1342	const char *tgt_name;
1343	const struct btf_type *tgt_type;
1344};
1345
1346#define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1347
1348struct bpf_dispatcher_prog {
1349	struct bpf_prog *prog;
1350	refcount_t users;
1351};
1352
1353struct bpf_dispatcher {
1354	/* dispatcher mutex */
1355	struct mutex mutex;
1356	void *func;
1357	struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1358	int num_progs;
1359	void *image;
1360	void *rw_image;
1361	u32 image_off;
1362	struct bpf_ksym ksym;
1363#ifdef CONFIG_HAVE_STATIC_CALL
1364	struct static_call_key *sc_key;
1365	void *sc_tramp;
1366#endif
1367};
1368
1369#ifndef __bpfcall
1370#define __bpfcall __nocfi
1371#endif
1372
1373static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func(
1374	const void *ctx,
1375	const struct bpf_insn *insnsi,
1376	bpf_func_t bpf_func)
1377{
1378	return bpf_func(ctx, insnsi);
1379}
1380
1381/* the implementation of the opaque uapi struct bpf_dynptr */
1382struct bpf_dynptr_kern {
1383	void *data;
1384	/* Size represents the number of usable bytes of dynptr data.
1385	 * If for example the offset is at 4 for a local dynptr whose data is
1386	 * of type u64, the number of usable bytes is 4.
1387	 *
1388	 * The upper 8 bits are reserved. It is as follows:
1389	 * Bits 0 - 23 = size
1390	 * Bits 24 - 30 = dynptr type
1391	 * Bit 31 = whether dynptr is read-only
1392	 */
1393	u32 size;
1394	u32 offset;
1395} __aligned(8);
1396
1397enum bpf_dynptr_type {
1398	BPF_DYNPTR_TYPE_INVALID,
1399	/* Points to memory that is local to the bpf program */
1400	BPF_DYNPTR_TYPE_LOCAL,
1401	/* Underlying data is a ringbuf record */
1402	BPF_DYNPTR_TYPE_RINGBUF,
1403	/* Underlying data is a sk_buff */
1404	BPF_DYNPTR_TYPE_SKB,
1405	/* Underlying data is a xdp_buff */
1406	BPF_DYNPTR_TYPE_XDP,
1407	/* Points to skb_metadata_end()-skb_metadata_len() */
1408	BPF_DYNPTR_TYPE_SKB_META,
1409	/* Underlying data is a file */
1410	BPF_DYNPTR_TYPE_FILE,
1411};
1412
1413int bpf_dynptr_check_size(u64 size);
1414u64 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1415const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u64 len);
1416void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u64 len);
1417bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
1418int __bpf_dynptr_write(const struct bpf_dynptr_kern *dst, u64 offset,
1419		       void *src, u64 len, u64 flags);
1420void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *p, u64 offset,
1421			    void *buffer__opt, u64 buffer__szk);
1422
1423static inline int bpf_dynptr_check_off_len(const struct bpf_dynptr_kern *ptr, u64 offset, u64 len)
1424{
1425	u64 size = __bpf_dynptr_size(ptr);
1426
1427	if (len > size || offset > size - len)
1428		return -E2BIG;
1429
1430	return 0;
1431}
1432
1433#ifdef CONFIG_BPF_JIT
1434int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1435			     struct bpf_trampoline *tr,
1436			     struct bpf_prog *tgt_prog);
1437int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1438			       struct bpf_trampoline *tr,
1439			       struct bpf_prog *tgt_prog);
1440struct bpf_trampoline *bpf_trampoline_get(u64 key,
1441					  struct bpf_attach_target_info *tgt_info);
1442void bpf_trampoline_put(struct bpf_trampoline *tr);
1443int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1444
1445/*
1446 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1447 * indirection with a direct call to the bpf program. If the architecture does
1448 * not have STATIC_CALL, avoid a double-indirection.
1449 */
1450#ifdef CONFIG_HAVE_STATIC_CALL
1451
1452#define __BPF_DISPATCHER_SC_INIT(_name)				\
1453	.sc_key = &STATIC_CALL_KEY(_name),			\
1454	.sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1455
1456#define __BPF_DISPATCHER_SC(name)				\
1457	DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1458
1459#define __BPF_DISPATCHER_CALL(name)				\
1460	static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1461
1462#define __BPF_DISPATCHER_UPDATE(_d, _new)			\
1463	__static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1464
1465#else
1466#define __BPF_DISPATCHER_SC_INIT(name)
1467#define __BPF_DISPATCHER_SC(name)
1468#define __BPF_DISPATCHER_CALL(name)		bpf_func(ctx, insnsi)
1469#define __BPF_DISPATCHER_UPDATE(_d, _new)
1470#endif
1471
1472#define BPF_DISPATCHER_INIT(_name) {				\
1473	.mutex = __MUTEX_INITIALIZER(_name.mutex),		\
1474	.func = &_name##_func,					\
1475	.progs = {},						\
1476	.num_progs = 0,						\
1477	.image = NULL,						\
1478	.image_off = 0,						\
1479	.ksym = {						\
1480		.name  = #_name,				\
1481		.lnode = LIST_HEAD_INIT(_name.ksym.lnode),	\
1482	},							\
1483	__BPF_DISPATCHER_SC_INIT(_name##_call)			\
1484}
1485
1486#define DEFINE_BPF_DISPATCHER(name)					\
1487	__BPF_DISPATCHER_SC(name);					\
1488	noinline __bpfcall unsigned int bpf_dispatcher_##name##_func(	\
1489		const void *ctx,					\
1490		const struct bpf_insn *insnsi,				\
1491		bpf_func_t bpf_func)					\
1492	{								\
1493		return __BPF_DISPATCHER_CALL(name);			\
1494	}								\
1495	EXPORT_SYMBOL(bpf_dispatcher_##name##_func);			\
1496	struct bpf_dispatcher bpf_dispatcher_##name =			\
1497		BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1498
1499#define DECLARE_BPF_DISPATCHER(name)					\
1500	unsigned int bpf_dispatcher_##name##_func(			\
1501		const void *ctx,					\
1502		const struct bpf_insn *insnsi,				\
1503		bpf_func_t bpf_func);					\
1504	extern struct bpf_dispatcher bpf_dispatcher_##name;
1505
1506#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1507#define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1508void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1509				struct bpf_prog *to);
1510/* Called only from JIT-enabled code, so there's no need for stubs. */
1511void bpf_image_ksym_init(void *data, unsigned int size, struct bpf_ksym *ksym);
1512void bpf_image_ksym_add(struct bpf_ksym *ksym);
1513void bpf_image_ksym_del(struct bpf_ksym *ksym);
1514void bpf_ksym_add(struct bpf_ksym *ksym);
1515void bpf_ksym_del(struct bpf_ksym *ksym);
1516bool bpf_has_frame_pointer(unsigned long ip);
1517int bpf_jit_charge_modmem(u32 size);
1518void bpf_jit_uncharge_modmem(u32 size);
1519bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1520#else
1521static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1522					   struct bpf_trampoline *tr,
1523					   struct bpf_prog *tgt_prog)
1524{
1525	return -ENOTSUPP;
1526}
1527static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1528					     struct bpf_trampoline *tr,
1529					     struct bpf_prog *tgt_prog)
1530{
1531	return -ENOTSUPP;
1532}
1533static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1534							struct bpf_attach_target_info *tgt_info)
1535{
1536	return NULL;
1537}
1538static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1539#define DEFINE_BPF_DISPATCHER(name)
1540#define DECLARE_BPF_DISPATCHER(name)
1541#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1542#define BPF_DISPATCHER_PTR(name) NULL
1543static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1544					      struct bpf_prog *from,
1545					      struct bpf_prog *to) {}
1546static inline bool is_bpf_image_address(unsigned long address)
1547{
1548	return false;
1549}
1550static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1551{
1552	return false;
1553}
1554#endif
1555
1556struct bpf_func_info_aux {
1557	u16 linkage;
1558	bool unreliable;
1559	bool called : 1;
1560	bool verified : 1;
1561};
1562
1563enum bpf_jit_poke_reason {
1564	BPF_POKE_REASON_TAIL_CALL,
1565};
1566
1567/* Descriptor of pokes pointing /into/ the JITed image. */
1568struct bpf_jit_poke_descriptor {
1569	void *tailcall_target;
1570	void *tailcall_bypass;
1571	void *bypass_addr;
1572	void *aux;
1573	union {
1574		struct {
1575			struct bpf_map *map;
1576			u32 key;
1577		} tail_call;
1578	};
1579	bool tailcall_target_stable;
1580	u8 adj_off;
1581	u16 reason;
1582	u32 insn_idx;
1583};
1584
1585/* reg_type info for ctx arguments */
1586struct bpf_ctx_arg_aux {
1587	u32 offset;
1588	enum bpf_reg_type reg_type;
1589	struct btf *btf;
1590	u32 btf_id;
1591	u32 ref_obj_id;
1592	bool refcounted;
1593};
1594
1595struct btf_mod_pair {
1596	struct btf *btf;
1597	struct module *module;
1598};
1599
1600struct bpf_kfunc_desc_tab;
1601
1602enum bpf_stream_id {
1603	BPF_STDOUT = 1,
1604	BPF_STDERR = 2,
1605};
1606
1607struct bpf_stream_elem {
1608	struct llist_node node;
1609	int total_len;
1610	int consumed_len;
1611	char str[];
1612};
1613
1614enum {
1615	/* 100k bytes */
1616	BPF_STREAM_MAX_CAPACITY = 100000ULL,
1617};
1618
1619struct bpf_stream {
1620	atomic_t capacity;
1621	struct llist_head log;	/* list of in-flight stream elements in LIFO order */
1622
1623	struct mutex lock;  /* lock protecting backlog_{head,tail} */
1624	struct llist_node *backlog_head; /* list of in-flight stream elements in FIFO order */
1625	struct llist_node *backlog_tail; /* tail of the list above */
1626};
1627
1628struct bpf_stream_stage {
1629	struct llist_head log;
1630	int len;
1631};
1632
1633struct bpf_prog_aux {
1634	atomic64_t refcnt;
1635	u32 used_map_cnt;
1636	u32 used_btf_cnt;
1637	u32 max_ctx_offset;
1638	u32 max_pkt_offset;
1639	u32 max_tp_access;
1640	u32 stack_depth;
1641	u32 id;
1642	u32 func_cnt; /* used by non-func prog as the number of func progs */
1643	u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */
1644	u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1645	u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1646	u32 attach_st_ops_member_off;
1647	u32 ctx_arg_info_size;
1648	u32 max_rdonly_access;
1649	u32 max_rdwr_access;
1650	u32 subprog_start;
1651	struct btf *attach_btf;
1652	struct bpf_ctx_arg_aux *ctx_arg_info;
1653	void __percpu *priv_stack_ptr;
1654	struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1655	struct bpf_prog *dst_prog;
1656	struct bpf_trampoline *dst_trampoline;
1657	enum bpf_prog_type saved_dst_prog_type;
1658	enum bpf_attach_type saved_dst_attach_type;
1659	bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1660	bool dev_bound; /* Program is bound to the netdev. */
1661	bool offload_requested; /* Program is bound and offloaded to the netdev. */
1662	bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1663	bool attach_tracing_prog; /* true if tracing another tracing program */
1664	bool func_proto_unreliable;
1665	bool tail_call_reachable;
1666	bool xdp_has_frags;
1667	bool exception_cb;
1668	bool exception_boundary;
1669	bool is_extended; /* true if extended by freplace program */
1670	bool jits_use_priv_stack;
1671	bool priv_stack_requested;
1672	bool changes_pkt_data;
1673	bool might_sleep;
1674	bool kprobe_write_ctx;
1675	u64 prog_array_member_cnt; /* counts how many times as member of prog_array */
1676	struct mutex ext_mutex; /* mutex for is_extended and prog_array_member_cnt */
1677	struct bpf_arena *arena;
1678	void (*recursion_detected)(struct bpf_prog *prog); /* callback if recursion is detected */
1679	/* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1680	const struct btf_type *attach_func_proto;
1681	/* function name for valid attach_btf_id */
1682	const char *attach_func_name;
1683	struct bpf_prog **func;
1684	struct bpf_prog_aux *main_prog_aux;
1685	void *jit_data; /* JIT specific data. arch dependent */
1686	struct bpf_jit_poke_descriptor *poke_tab;
1687	struct bpf_kfunc_desc_tab *kfunc_tab;
1688	struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1689	u32 size_poke_tab;
1690#ifdef CONFIG_FINEIBT
1691	struct bpf_ksym ksym_prefix;
1692#endif
1693	struct bpf_ksym ksym;
1694	const struct bpf_prog_ops *ops;
1695	const struct bpf_struct_ops *st_ops;
1696	struct bpf_map **used_maps;
1697	struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1698	struct btf_mod_pair *used_btfs;
1699	struct bpf_prog *prog;
1700	struct user_struct *user;
1701	u64 load_time; /* ns since boottime */
1702	u32 verified_insns;
1703	int cgroup_atype; /* enum cgroup_bpf_attach_type */
1704	struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1705	char name[BPF_OBJ_NAME_LEN];
1706	u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64);
1707#ifdef CONFIG_SECURITY
1708	void *security;
1709#endif
1710	struct bpf_token *token;
1711	struct bpf_prog_offload *offload;
1712	struct btf *btf;
1713	struct bpf_func_info *func_info;
1714	struct bpf_func_info_aux *func_info_aux;
1715	/* bpf_line_info loaded from userspace.  linfo->insn_off
1716	 * has the xlated insn offset.
1717	 * Both the main and sub prog share the same linfo.
1718	 * The subprog can access its first linfo by
1719	 * using the linfo_idx.
1720	 */
1721	struct bpf_line_info *linfo;
1722	/* jited_linfo is the jited addr of the linfo.  It has a
1723	 * one to one mapping to linfo:
1724	 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1725	 * Both the main and sub prog share the same jited_linfo.
1726	 * The subprog can access its first jited_linfo by
1727	 * using the linfo_idx.
1728	 */
1729	void **jited_linfo;
1730	u32 func_info_cnt;
1731	u32 nr_linfo;
1732	/* subprog can use linfo_idx to access its first linfo and
1733	 * jited_linfo.
1734	 * main prog always has linfo_idx == 0
1735	 */
1736	u32 linfo_idx;
1737	struct module *mod;
1738	u32 num_exentries;
1739	struct exception_table_entry *extable;
1740	union {
1741		struct work_struct work;
1742		struct rcu_head	rcu;
1743	};
1744	struct bpf_stream stream[2];
1745};
1746
1747struct bpf_prog {
1748	u16			pages;		/* Number of allocated pages */
1749	u16			jited:1,	/* Is our filter JIT'ed? */
1750				jit_requested:1,/* archs need to JIT the prog */
1751				gpl_compatible:1, /* Is filter GPL compatible? */
1752				cb_access:1,	/* Is control block accessed? */
1753				dst_needed:1,	/* Do we need dst entry? */
1754				blinding_requested:1, /* needs constant blinding */
1755				blinded:1,	/* Was blinded */
1756				is_func:1,	/* program is a bpf function */
1757				kprobe_override:1, /* Do we override a kprobe? */
1758				has_callchain_buf:1, /* callchain buffer allocated? */
1759				enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1760				call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1761				call_get_func_ip:1, /* Do we call get_func_ip() */
1762				tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */
1763				sleepable:1;	/* BPF program is sleepable */
1764	enum bpf_prog_type	type;		/* Type of BPF program */
1765	enum bpf_attach_type	expected_attach_type; /* For some prog types */
1766	u32			len;		/* Number of filter blocks */
1767	u32			jited_len;	/* Size of jited insns in bytes */
1768	union {
1769		u8 digest[SHA256_DIGEST_SIZE];
1770		u8 tag[BPF_TAG_SIZE];
1771	};
1772	struct bpf_prog_stats __percpu *stats;
1773	int __percpu		*active;
1774	unsigned int		(*bpf_func)(const void *ctx,
1775					    const struct bpf_insn *insn);
1776	struct bpf_prog_aux	*aux;		/* Auxiliary fields */
1777	struct sock_fprog_kern	*orig_prog;	/* Original BPF program */
1778	/* Instructions for interpreter */
1779	union {
1780		DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1781		DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1782	};
1783};
1784
1785struct bpf_array_aux {
1786	/* Programs with direct jumps into programs part of this array. */
1787	struct list_head poke_progs;
1788	struct bpf_map *map;
1789	struct mutex poke_mutex;
1790	struct work_struct work;
1791};
1792
1793struct bpf_link {
1794	atomic64_t refcnt;
1795	u32 id;
1796	enum bpf_link_type type;
1797	const struct bpf_link_ops *ops;
1798	struct bpf_prog *prog;
1799
1800	u32 flags;
1801	enum bpf_attach_type attach_type;
1802
1803	/* rcu is used before freeing, work can be used to schedule that
1804	 * RCU-based freeing before that, so they never overlap
1805	 */
1806	union {
1807		struct rcu_head rcu;
1808		struct work_struct work;
1809	};
1810	/* whether BPF link itself has "sleepable" semantics, which can differ
1811	 * from underlying BPF program having a "sleepable" semantics, as BPF
1812	 * link's semantics is determined by target attach hook
1813	 */
1814	bool sleepable;
1815};
1816
1817struct bpf_link_ops {
1818	void (*release)(struct bpf_link *link);
1819	/* deallocate link resources callback, called without RCU grace period
1820	 * waiting
1821	 */
1822	void (*dealloc)(struct bpf_link *link);
1823	/* deallocate link resources callback, called after RCU grace period;
1824	 * if either the underlying BPF program is sleepable or BPF link's
1825	 * target hook is sleepable, we'll go through tasks trace RCU GP and
1826	 * then "classic" RCU GP; this need for chaining tasks trace and
1827	 * classic RCU GPs is designated by setting bpf_link->sleepable flag
1828	 */
1829	void (*dealloc_deferred)(struct bpf_link *link);
1830	int (*detach)(struct bpf_link *link);
1831	int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1832			   struct bpf_prog *old_prog);
1833	void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1834	int (*fill_link_info)(const struct bpf_link *link,
1835			      struct bpf_link_info *info);
1836	int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1837			  struct bpf_map *old_map);
1838	__poll_t (*poll)(struct file *file, struct poll_table_struct *pts);
1839};
1840
1841struct bpf_tramp_link {
1842	struct bpf_link link;
1843	struct hlist_node tramp_hlist;
1844	u64 cookie;
1845};
1846
1847struct bpf_shim_tramp_link {
1848	struct bpf_tramp_link link;
1849	struct bpf_trampoline *trampoline;
1850};
1851
1852struct bpf_tracing_link {
1853	struct bpf_tramp_link link;
1854	struct bpf_trampoline *trampoline;
1855	struct bpf_prog *tgt_prog;
1856};
1857
1858struct bpf_raw_tp_link {
1859	struct bpf_link link;
1860	struct bpf_raw_event_map *btp;
1861	u64 cookie;
1862};
1863
1864struct bpf_link_primer {
1865	struct bpf_link *link;
1866	struct file *file;
1867	int fd;
1868	u32 id;
1869};
1870
1871struct bpf_mount_opts {
1872	kuid_t uid;
1873	kgid_t gid;
1874	umode_t mode;
1875
1876	/* BPF token-related delegation options */
1877	u64 delegate_cmds;
1878	u64 delegate_maps;
1879	u64 delegate_progs;
1880	u64 delegate_attachs;
1881};
1882
1883struct bpf_token {
1884	struct work_struct work;
1885	atomic64_t refcnt;
1886	struct user_namespace *userns;
1887	u64 allowed_cmds;
1888	u64 allowed_maps;
1889	u64 allowed_progs;
1890	u64 allowed_attachs;
1891#ifdef CONFIG_SECURITY
1892	void *security;
1893#endif
1894};
1895
1896struct bpf_struct_ops_value;
1897struct btf_member;
1898
1899#define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1900/**
1901 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1902 *			   define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1903 *			   of BPF_PROG_TYPE_STRUCT_OPS progs.
1904 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1905 *		  when determining whether the struct_ops progs in the
1906 *		  struct_ops map are valid.
1907 * @init: A callback that is invoked a single time, and before any other
1908 *	  callback, to initialize the structure. A nonzero return value means
1909 *	  the subsystem could not be initialized.
1910 * @check_member: When defined, a callback invoked by the verifier to allow
1911 *		  the subsystem to determine if an entry in the struct_ops map
1912 *		  is valid. A nonzero return value means that the map is
1913 *		  invalid and should be rejected by the verifier.
1914 * @init_member: A callback that is invoked for each member of the struct_ops
1915 *		 map to allow the subsystem to initialize the member. A nonzero
1916 *		 value means the member could not be initialized. This callback
1917 *		 is exclusive with the @type, @type_id, @value_type, and
1918 *		 @value_id fields.
1919 * @reg: A callback that is invoked when the struct_ops map has been
1920 *	 initialized and is being attached to. Zero means the struct_ops map
1921 *	 has been successfully registered and is live. A nonzero return value
1922 *	 means the struct_ops map could not be registered.
1923 * @unreg: A callback that is invoked when the struct_ops map should be
1924 *	   unregistered.
1925 * @update: A callback that is invoked when the live struct_ops map is being
1926 *	    updated to contain new values. This callback is only invoked when
1927 *	    the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1928 *	    it is assumed that the struct_ops map cannot be updated.
1929 * @validate: A callback that is invoked after all of the members have been
1930 *	      initialized. This callback should perform static checks on the
1931 *	      map, meaning that it should either fail or succeed
1932 *	      deterministically. A struct_ops map that has been validated may
1933 *	      not necessarily succeed in being registered if the call to @reg
1934 *	      fails. For example, a valid struct_ops map may be loaded, but
1935 *	      then fail to be registered due to there being another active
1936 *	      struct_ops map on the system in the subsystem already. For this
1937 *	      reason, if this callback is not defined, the check is skipped as
1938 *	      the struct_ops map will have final verification performed in
1939 *	      @reg.
1940 * @cfi_stubs: Pointer to a structure of stub functions for CFI. These stubs
1941 *	       provide the correct Control Flow Integrity hashes for the
1942 *	       trampolines generated by BPF struct_ops.
1943 * @owner: The module that owns this struct_ops. Used for module reference
1944 *	   counting to ensure the module providing the struct_ops cannot be
1945 *	   unloaded while in use.
1946 * @name: The name of the struct bpf_struct_ops object.
1947 * @func_models: Func models
1948 */
1949struct bpf_struct_ops {
1950	const struct bpf_verifier_ops *verifier_ops;
1951	int (*init)(struct btf *btf);
1952	int (*check_member)(const struct btf_type *t,
1953			    const struct btf_member *member,
1954			    const struct bpf_prog *prog);
1955	int (*init_member)(const struct btf_type *t,
1956			   const struct btf_member *member,
1957			   void *kdata, const void *udata);
1958	int (*reg)(void *kdata, struct bpf_link *link);
1959	void (*unreg)(void *kdata, struct bpf_link *link);
1960	int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);
1961	int (*validate)(void *kdata);
1962	void *cfi_stubs;
1963	struct module *owner;
1964	const char *name;
1965	struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1966};
1967
1968/* Every member of a struct_ops type has an instance even a member is not
1969 * an operator (function pointer). The "info" field will be assigned to
1970 * prog->aux->ctx_arg_info of BPF struct_ops programs to provide the
1971 * argument information required by the verifier to verify the program.
1972 *
1973 * btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the
1974 * corresponding entry for an given argument.
1975 */
1976struct bpf_struct_ops_arg_info {
1977	struct bpf_ctx_arg_aux *info;
1978	u32 cnt;
1979};
1980
1981struct bpf_struct_ops_desc {
1982	struct bpf_struct_ops *st_ops;
1983
1984	const struct btf_type *type;
1985	const struct btf_type *value_type;
1986	u32 type_id;
1987	u32 value_id;
1988
1989	/* Collection of argument information for each member */
1990	struct bpf_struct_ops_arg_info *arg_info;
1991};
1992
1993enum bpf_struct_ops_state {
1994	BPF_STRUCT_OPS_STATE_INIT,
1995	BPF_STRUCT_OPS_STATE_INUSE,
1996	BPF_STRUCT_OPS_STATE_TOBEFREE,
1997	BPF_STRUCT_OPS_STATE_READY,
1998};
1999
2000struct bpf_struct_ops_common_value {
2001	refcount_t refcnt;
2002	enum bpf_struct_ops_state state;
2003};
2004
2005#if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
2006/* This macro helps developer to register a struct_ops type and generate
2007 * type information correctly. Developers should use this macro to register
2008 * a struct_ops type instead of calling __register_bpf_struct_ops() directly.
2009 */
2010#define register_bpf_struct_ops(st_ops, type)				\
2011	({								\
2012		struct bpf_struct_ops_##type {				\
2013			struct bpf_struct_ops_common_value common;	\
2014			struct type data ____cacheline_aligned_in_smp;	\
2015		};							\
2016		BTF_TYPE_EMIT(struct bpf_struct_ops_##type);		\
2017		__register_bpf_struct_ops(st_ops);			\
2018	})
2019#define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
2020bool bpf_struct_ops_get(const void *kdata);
2021void bpf_struct_ops_put(const void *kdata);
2022int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff);
2023int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
2024				       void *value);
2025int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
2026				      struct bpf_tramp_link *link,
2027				      const struct btf_func_model *model,
2028				      void *stub_func,
2029				      void **image, u32 *image_off,
2030				      bool allow_alloc);
2031void bpf_struct_ops_image_free(void *image);
2032static inline bool bpf_try_module_get(const void *data, struct module *owner)
2033{
2034	if (owner == BPF_MODULE_OWNER)
2035		return bpf_struct_ops_get(data);
2036	else
2037		return try_module_get(owner);
2038}
2039static inline void bpf_module_put(const void *data, struct module *owner)
2040{
2041	if (owner == BPF_MODULE_OWNER)
2042		bpf_struct_ops_put(data);
2043	else
2044		module_put(owner);
2045}
2046int bpf_struct_ops_link_create(union bpf_attr *attr);
2047u32 bpf_struct_ops_id(const void *kdata);
2048
2049#ifdef CONFIG_NET
2050/* Define it here to avoid the use of forward declaration */
2051struct bpf_dummy_ops_state {
2052	int val;
2053};
2054
2055struct bpf_dummy_ops {
2056	int (*test_1)(struct bpf_dummy_ops_state *cb);
2057	int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
2058		      char a3, unsigned long a4);
2059	int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
2060};
2061
2062int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
2063			    union bpf_attr __user *uattr);
2064#endif
2065int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
2066			     struct btf *btf,
2067			     struct bpf_verifier_log *log);
2068void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2069void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc);
2070#else
2071#define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
2072static inline bool bpf_try_module_get(const void *data, struct module *owner)
2073{
2074	return try_module_get(owner);
2075}
2076static inline void bpf_module_put(const void *data, struct module *owner)
2077{
2078	module_put(owner);
2079}
2080static inline int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)
2081{
2082	return -ENOTSUPP;
2083}
2084static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
2085						     void *key,
2086						     void *value)
2087{
2088	return -EINVAL;
2089}
2090static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
2091{
2092	return -EOPNOTSUPP;
2093}
2094static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map)
2095{
2096}
2097
2098static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc)
2099{
2100}
2101
2102#endif
2103
2104int bpf_prog_ctx_arg_info_init(struct bpf_prog *prog,
2105			       const struct bpf_ctx_arg_aux *info, u32 cnt);
2106
2107#if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
2108int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
2109				    int cgroup_atype,
2110				    enum bpf_attach_type attach_type);
2111void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
2112#else
2113static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
2114						  int cgroup_atype,
2115						  enum bpf_attach_type attach_type)
2116{
2117	return -EOPNOTSUPP;
2118}
2119static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
2120{
2121}
2122#endif
2123
2124struct bpf_array {
2125	struct bpf_map map;
2126	u32 elem_size;
2127	u32 index_mask;
2128	struct bpf_array_aux *aux;
2129	union {
2130		DECLARE_FLEX_ARRAY(char, value) __aligned(8);
2131		DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
2132		DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
2133	};
2134};
2135
2136/*
2137 * The bpf_array_get_next_key() function may be used for all array-like
2138 * maps, i.e., maps with u32 keys with range [0 ,..., max_entries)
2139 */
2140int bpf_array_get_next_key(struct bpf_map *map, void *key, void *next_key);
2141
2142#define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
2143#define MAX_TAIL_CALL_CNT 33
2144
2145/* Maximum number of loops for bpf_loop and bpf_iter_num.
2146 * It's enum to expose it (and thus make it discoverable) through BTF.
2147 */
2148enum {
2149	BPF_MAX_LOOPS = 8 * 1024 * 1024,
2150	BPF_MAX_TIMED_LOOPS = 0xffff,
2151};
2152
2153#define BPF_F_ACCESS_MASK	(BPF_F_RDONLY |		\
2154				 BPF_F_RDONLY_PROG |	\
2155				 BPF_F_WRONLY |		\
2156				 BPF_F_WRONLY_PROG)
2157
2158#define BPF_MAP_CAN_READ	BIT(0)
2159#define BPF_MAP_CAN_WRITE	BIT(1)
2160
2161/* Maximum number of user-producer ring buffer samples that can be drained in
2162 * a call to bpf_user_ringbuf_drain().
2163 */
2164#define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
2165
2166static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
2167{
2168	u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2169
2170	/* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
2171	 * not possible.
2172	 */
2173	if (access_flags & BPF_F_RDONLY_PROG)
2174		return BPF_MAP_CAN_READ;
2175	else if (access_flags & BPF_F_WRONLY_PROG)
2176		return BPF_MAP_CAN_WRITE;
2177	else
2178		return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
2179}
2180
2181static inline bool bpf_map_flags_access_ok(u32 access_flags)
2182{
2183	return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
2184	       (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2185}
2186
2187static inline struct bpf_map_owner *bpf_map_owner_alloc(struct bpf_map *map)
2188{
2189	return kzalloc(sizeof(*map->owner), GFP_ATOMIC);
2190}
2191
2192static inline void bpf_map_owner_free(struct bpf_map *map)
2193{
2194	kfree(map->owner);
2195}
2196
2197struct bpf_event_entry {
2198	struct perf_event *event;
2199	struct file *perf_file;
2200	struct file *map_file;
2201	struct rcu_head rcu;
2202};
2203
2204static inline bool map_type_contains_progs(struct bpf_map *map)
2205{
2206	return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
2207	       map->map_type == BPF_MAP_TYPE_DEVMAP ||
2208	       map->map_type == BPF_MAP_TYPE_CPUMAP;
2209}
2210
2211bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
2212int bpf_prog_calc_tag(struct bpf_prog *fp);
2213
2214const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
2215const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
2216
2217const struct bpf_func_proto *bpf_get_perf_event_read_value_proto(void);
2218
2219typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
2220					unsigned long off, unsigned long len);
2221typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
2222					const struct bpf_insn *src,
2223					struct bpf_insn *dst,
2224					struct bpf_prog *prog,
2225					u32 *target_size);
2226
2227u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
2228		     void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
2229
2230/* an array of programs to be executed under rcu_lock.
2231 *
2232 * Typical usage:
2233 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
2234 *
2235 * the structure returned by bpf_prog_array_alloc() should be populated
2236 * with program pointers and the last pointer must be NULL.
2237 * The user has to keep refcnt on the program and make sure the program
2238 * is removed from the array before bpf_prog_put().
2239 * The 'struct bpf_prog_array *' should only be replaced with xchg()
2240 * since other cpus are walking the array of pointers in parallel.
2241 */
2242struct bpf_prog_array_item {
2243	struct bpf_prog *prog;
2244	union {
2245		struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
2246		u64 bpf_cookie;
2247	};
2248};
2249
2250struct bpf_prog_array {
2251	struct rcu_head rcu;
2252	struct bpf_prog_array_item items[];
2253};
2254
2255struct bpf_empty_prog_array {
2256	struct bpf_prog_array hdr;
2257	struct bpf_prog *null_prog;
2258};
2259
2260/* to avoid allocating empty bpf_prog_array for cgroups that
2261 * don't have bpf program attached use one global 'bpf_empty_prog_array'
2262 * It will not be modified the caller of bpf_prog_array_alloc()
2263 * (since caller requested prog_cnt == 0)
2264 * that pointer should be 'freed' by bpf_prog_array_free()
2265 */
2266extern struct bpf_empty_prog_array bpf_empty_prog_array;
2267
2268struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
2269void bpf_prog_array_free(struct bpf_prog_array *progs);
2270/* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
2271void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
2272int bpf_prog_array_length(struct bpf_prog_array *progs);
2273bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
2274int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
2275				__u32 __user *prog_ids, u32 cnt);
2276
2277void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
2278				struct bpf_prog *old_prog);
2279int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
2280int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
2281			     struct bpf_prog *prog);
2282int bpf_prog_array_copy_info(struct bpf_prog_array *array,
2283			     u32 *prog_ids, u32 request_cnt,
2284			     u32 *prog_cnt);
2285int bpf_prog_array_copy(struct bpf_prog_array *old_array,
2286			struct bpf_prog *exclude_prog,
2287			struct bpf_prog *include_prog,
2288			u64 bpf_cookie,
2289			struct bpf_prog_array **new_array);
2290
2291struct bpf_run_ctx {};
2292
2293struct bpf_cg_run_ctx {
2294	struct bpf_run_ctx run_ctx;
2295	const struct bpf_prog_array_item *prog_item;
2296	int retval;
2297};
2298
2299struct bpf_trace_run_ctx {
2300	struct bpf_run_ctx run_ctx;
2301	u64 bpf_cookie;
2302	bool is_uprobe;
2303};
2304
2305struct bpf_tramp_run_ctx {
2306	struct bpf_run_ctx run_ctx;
2307	u64 bpf_cookie;
2308	struct bpf_run_ctx *saved_run_ctx;
2309};
2310
2311static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
2312{
2313	struct bpf_run_ctx *old_ctx = NULL;
2314
2315#ifdef CONFIG_BPF_SYSCALL
2316	old_ctx = current->bpf_ctx;
2317	current->bpf_ctx = new_ctx;
2318#endif
2319	return old_ctx;
2320}
2321
2322static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
2323{
2324#ifdef CONFIG_BPF_SYSCALL
2325	current->bpf_ctx = old_ctx;
2326#endif
2327}
2328
2329/* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
2330#define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE			(1 << 0)
2331/* BPF program asks to set CN on the packet. */
2332#define BPF_RET_SET_CN						(1 << 0)
2333
2334typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
2335
2336static __always_inline u32
2337bpf_prog_run_array(const struct bpf_prog_array *array,
2338		   const void *ctx, bpf_prog_run_fn run_prog)
2339{
2340	const struct bpf_prog_array_item *item;
2341	const struct bpf_prog *prog;
2342	struct bpf_run_ctx *old_run_ctx;
2343	struct bpf_trace_run_ctx run_ctx;
2344	u32 ret = 1;
2345
2346	RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
2347
2348	if (unlikely(!array))
2349		return ret;
2350
2351	run_ctx.is_uprobe = false;
2352
2353	migrate_disable();
2354	old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2355	item = &array->items[0];
2356	while ((prog = READ_ONCE(item->prog))) {
2357		run_ctx.bpf_cookie = item->bpf_cookie;
2358		ret &= run_prog(prog, ctx);
2359		item++;
2360	}
2361	bpf_reset_run_ctx(old_run_ctx);
2362	migrate_enable();
2363	return ret;
2364}
2365
2366/* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
2367 *
2368 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
2369 * overall. As a result, we must use the bpf_prog_array_free_sleepable
2370 * in order to use the tasks_trace rcu grace period.
2371 *
2372 * When a non-sleepable program is inside the array, we take the rcu read
2373 * section and disable preemption for that program alone, so it can access
2374 * rcu-protected dynamically sized maps.
2375 */
2376static __always_inline u32
2377bpf_prog_run_array_uprobe(const struct bpf_prog_array *array,
2378			  const void *ctx, bpf_prog_run_fn run_prog)
2379{
2380	const struct bpf_prog_array_item *item;
2381	const struct bpf_prog *prog;
2382	struct bpf_run_ctx *old_run_ctx;
2383	struct bpf_trace_run_ctx run_ctx;
2384	u32 ret = 1;
2385
2386	might_fault();
2387	RCU_LOCKDEP_WARN(!rcu_read_lock_trace_held(), "no rcu lock held");
2388
2389	if (unlikely(!array))
2390		return ret;
2391
2392	migrate_disable();
2393
2394	run_ctx.is_uprobe = true;
2395
2396	old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2397	item = &array->items[0];
2398	while ((prog = READ_ONCE(item->prog))) {
2399		if (!prog->sleepable)
2400			rcu_read_lock();
2401
2402		run_ctx.bpf_cookie = item->bpf_cookie;
2403		ret &= run_prog(prog, ctx);
2404		item++;
2405
2406		if (!prog->sleepable)
2407			rcu_read_unlock();
2408	}
2409	bpf_reset_run_ctx(old_run_ctx);
2410	migrate_enable();
2411	return ret;
2412}
2413
2414bool bpf_jit_bypass_spec_v1(void);
2415bool bpf_jit_bypass_spec_v4(void);
2416
2417#define bpf_rcu_lock_held() \
2418	(rcu_read_lock_held() || rcu_read_lock_trace_held() || rcu_read_lock_bh_held())
2419
2420#ifdef CONFIG_BPF_SYSCALL
2421DECLARE_PER_CPU(int, bpf_prog_active);
2422extern struct mutex bpf_stats_enabled_mutex;
2423
2424/*
2425 * Block execution of BPF programs attached to instrumentation (perf,
2426 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2427 * these events can happen inside a region which holds a map bucket lock
2428 * and can deadlock on it.
2429 */
2430static inline void bpf_disable_instrumentation(void)
2431{
2432	migrate_disable();
2433	this_cpu_inc(bpf_prog_active);
2434}
2435
2436static inline void bpf_enable_instrumentation(void)
2437{
2438	this_cpu_dec(bpf_prog_active);
2439	migrate_enable();
2440}
2441
2442extern const struct super_operations bpf_super_ops;
2443extern const struct file_operations bpf_map_fops;
2444extern const struct file_operations bpf_prog_fops;
2445extern const struct file_operations bpf_iter_fops;
2446extern const struct file_operations bpf_token_fops;
2447
2448#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2449	extern const struct bpf_prog_ops _name ## _prog_ops; \
2450	extern const struct bpf_verifier_ops _name ## _verifier_ops;
2451#define BPF_MAP_TYPE(_id, _ops) \
2452	extern const struct bpf_map_ops _ops;
2453#define BPF_LINK_TYPE(_id, _name)
2454#include <linux/bpf_types.h>
2455#undef BPF_PROG_TYPE
2456#undef BPF_MAP_TYPE
2457#undef BPF_LINK_TYPE
2458
2459extern const struct bpf_prog_ops bpf_offload_prog_ops;
2460extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2461extern const struct bpf_verifier_ops xdp_analyzer_ops;
2462
2463struct bpf_prog *bpf_prog_get(u32 ufd);
2464struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2465				       bool attach_drv);
2466void bpf_prog_add(struct bpf_prog *prog, int i);
2467void bpf_prog_sub(struct bpf_prog *prog, int i);
2468void bpf_prog_inc(struct bpf_prog *prog);
2469struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2470void bpf_prog_put(struct bpf_prog *prog);
2471
2472void bpf_prog_free_id(struct bpf_prog *prog);
2473void bpf_map_free_id(struct bpf_map *map);
2474
2475struct btf_field *btf_record_find(const struct btf_record *rec,
2476				  u32 offset, u32 field_mask);
2477void btf_record_free(struct btf_record *rec);
2478void bpf_map_free_record(struct bpf_map *map);
2479struct btf_record *btf_record_dup(const struct btf_record *rec);
2480bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2481void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2482void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);
2483void bpf_obj_free_task_work(const struct btf_record *rec, void *obj);
2484void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2485void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);
2486
2487struct bpf_map *bpf_map_get(u32 ufd);
2488struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2489
2490/*
2491 * The __bpf_map_get() and __btf_get_by_fd() functions parse a file
2492 * descriptor and return a corresponding map or btf object.
2493 * Their names are double underscored to emphasize the fact that they
2494 * do not increase refcnt. To also increase refcnt use corresponding
2495 * bpf_map_get() and btf_get_by_fd() functions.
2496 */
2497
2498static inline struct bpf_map *__bpf_map_get(struct fd f)
2499{
2500	if (fd_empty(f))
2501		return ERR_PTR(-EBADF);
2502	if (unlikely(fd_file(f)->f_op != &bpf_map_fops))
2503		return ERR_PTR(-EINVAL);
2504	return fd_file(f)->private_data;
2505}
2506
2507static inline struct btf *__btf_get_by_fd(struct fd f)
2508{
2509	if (fd_empty(f))
2510		return ERR_PTR(-EBADF);
2511	if (unlikely(fd_file(f)->f_op != &btf_fops))
2512		return ERR_PTR(-EINVAL);
2513	return fd_file(f)->private_data;
2514}
2515
2516void bpf_map_inc(struct bpf_map *map);
2517void bpf_map_inc_with_uref(struct bpf_map *map);
2518struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2519struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2520void bpf_map_put_with_uref(struct bpf_map *map);
2521void bpf_map_put(struct bpf_map *map);
2522void *bpf_map_area_alloc(u64 size, int numa_node);
2523void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2524void bpf_map_area_free(void *base);
2525bool bpf_map_write_active(const struct bpf_map *map);
2526void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2527int  generic_map_lookup_batch(struct bpf_map *map,
2528			      const union bpf_attr *attr,
2529			      union bpf_attr __user *uattr);
2530int  generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2531			      const union bpf_attr *attr,
2532			      union bpf_attr __user *uattr);
2533int  generic_map_delete_batch(struct bpf_map *map,
2534			      const union bpf_attr *attr,
2535			      union bpf_attr __user *uattr);
2536struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2537struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2538
2539
2540int bpf_map_alloc_pages(const struct bpf_map *map, int nid,
2541			unsigned long nr_pages, struct page **page_array);
2542#ifdef CONFIG_MEMCG
2543void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2544			   int node);
2545void *bpf_map_kmalloc_nolock(const struct bpf_map *map, size_t size, gfp_t flags,
2546			     int node);
2547void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2548void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2549		       gfp_t flags);
2550void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2551				    size_t align, gfp_t flags);
2552#else
2553/*
2554 * These specialized allocators have to be macros for their allocations to be
2555 * accounted separately (to have separate alloc_tag).
2556 */
2557#define bpf_map_kmalloc_node(_map, _size, _flags, _node)	\
2558		kmalloc_node(_size, _flags, _node)
2559#define bpf_map_kmalloc_nolock(_map, _size, _flags, _node)	\
2560		kmalloc_nolock(_size, _flags, _node)
2561#define bpf_map_kzalloc(_map, _size, _flags)			\
2562		kzalloc(_size, _flags)
2563#define bpf_map_kvcalloc(_map, _n, _size, _flags)		\
2564		kvcalloc(_n, _size, _flags)
2565#define bpf_map_alloc_percpu(_map, _size, _align, _flags)	\
2566		__alloc_percpu_gfp(_size, _align, _flags)
2567#endif
2568
2569static inline int
2570bpf_map_init_elem_count(struct bpf_map *map)
2571{
2572	size_t size = sizeof(*map->elem_count), align = size;
2573	gfp_t flags = GFP_USER | __GFP_NOWARN;
2574
2575	map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2576	if (!map->elem_count)
2577		return -ENOMEM;
2578
2579	return 0;
2580}
2581
2582static inline void
2583bpf_map_free_elem_count(struct bpf_map *map)
2584{
2585	free_percpu(map->elem_count);
2586}
2587
2588static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2589{
2590	this_cpu_inc(*map->elem_count);
2591}
2592
2593static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2594{
2595	this_cpu_dec(*map->elem_count);
2596}
2597
2598extern int sysctl_unprivileged_bpf_disabled;
2599
2600bool bpf_token_capable(const struct bpf_token *token, int cap);
2601
2602static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token)
2603{
2604	return bpf_token_capable(token, CAP_PERFMON);
2605}
2606
2607static inline bool bpf_allow_uninit_stack(const struct bpf_token *token)
2608{
2609	return bpf_token_capable(token, CAP_PERFMON);
2610}
2611
2612static inline bool bpf_bypass_spec_v1(const struct bpf_token *token)
2613{
2614	return bpf_jit_bypass_spec_v1() ||
2615		cpu_mitigations_off() ||
2616		bpf_token_capable(token, CAP_PERFMON);
2617}
2618
2619static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)
2620{
2621	return bpf_jit_bypass_spec_v4() ||
2622		cpu_mitigations_off() ||
2623		bpf_token_capable(token, CAP_PERFMON);
2624}
2625
2626int bpf_map_new_fd(struct bpf_map *map, int flags);
2627int bpf_prog_new_fd(struct bpf_prog *prog);
2628
2629void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2630		   const struct bpf_link_ops *ops, struct bpf_prog *prog,
2631		   enum bpf_attach_type attach_type);
2632void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
2633			     const struct bpf_link_ops *ops, struct bpf_prog *prog,
2634			     enum bpf_attach_type attach_type, bool sleepable);
2635int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2636int bpf_link_settle(struct bpf_link_primer *primer);
2637void bpf_link_cleanup(struct bpf_link_primer *primer);
2638void bpf_link_inc(struct bpf_link *link);
2639struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
2640void bpf_link_put(struct bpf_link *link);
2641int bpf_link_new_fd(struct bpf_link *link);
2642struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2643struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2644
2645void bpf_token_inc(struct bpf_token *token);
2646void bpf_token_put(struct bpf_token *token);
2647int bpf_token_create(union bpf_attr *attr);
2648struct bpf_token *bpf_token_get_from_fd(u32 ufd);
2649int bpf_token_get_info_by_fd(struct bpf_token *token,
2650			     const union bpf_attr *attr,
2651			     union bpf_attr __user *uattr);
2652
2653bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
2654bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type);
2655bool bpf_token_allow_prog_type(const struct bpf_token *token,
2656			       enum bpf_prog_type prog_type,
2657			       enum bpf_attach_type attach_type);
2658
2659int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2660int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2661struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir,
2662			    umode_t mode);
2663
2664#define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2665#define DEFINE_BPF_ITER_FUNC(target, args...)			\
2666	extern int bpf_iter_ ## target(args);			\
2667	int __init bpf_iter_ ## target(args) { return 0; }
2668
2669/*
2670 * The task type of iterators.
2671 *
2672 * For BPF task iterators, they can be parameterized with various
2673 * parameters to visit only some of tasks.
2674 *
2675 * BPF_TASK_ITER_ALL (default)
2676 *	Iterate over resources of every task.
2677 *
2678 * BPF_TASK_ITER_TID
2679 *	Iterate over resources of a task/tid.
2680 *
2681 * BPF_TASK_ITER_TGID
2682 *	Iterate over resources of every task of a process / task group.
2683 */
2684enum bpf_iter_task_type {
2685	BPF_TASK_ITER_ALL = 0,
2686	BPF_TASK_ITER_TID,
2687	BPF_TASK_ITER_TGID,
2688};
2689
2690struct bpf_iter_aux_info {
2691	/* for map_elem iter */
2692	struct bpf_map *map;
2693
2694	/* for cgroup iter */
2695	struct {
2696		struct cgroup *start; /* starting cgroup */
2697		enum bpf_cgroup_iter_order order;
2698	} cgroup;
2699	struct {
2700		enum bpf_iter_task_type	type;
2701		u32 pid;
2702	} task;
2703};
2704
2705typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2706					union bpf_iter_link_info *linfo,
2707					struct bpf_iter_aux_info *aux);
2708typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2709typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2710					struct seq_file *seq);
2711typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2712					 struct bpf_link_info *info);
2713typedef const struct bpf_func_proto *
2714(*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2715			     const struct bpf_prog *prog);
2716
2717enum bpf_iter_feature {
2718	BPF_ITER_RESCHED	= BIT(0),
2719};
2720
2721#define BPF_ITER_CTX_ARG_MAX 2
2722struct bpf_iter_reg {
2723	const char *target;
2724	bpf_iter_attach_target_t attach_target;
2725	bpf_iter_detach_target_t detach_target;
2726	bpf_iter_show_fdinfo_t show_fdinfo;
2727	bpf_iter_fill_link_info_t fill_link_info;
2728	bpf_iter_get_func_proto_t get_func_proto;
2729	u32 ctx_arg_info_size;
2730	u32 feature;
2731	struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2732	const struct bpf_iter_seq_info *seq_info;
2733};
2734
2735struct bpf_iter_meta {
2736	__bpf_md_ptr(struct seq_file *, seq);
2737	u64 session_id;
2738	u64 seq_num;
2739};
2740
2741struct bpf_iter__bpf_map_elem {
2742	__bpf_md_ptr(struct bpf_iter_meta *, meta);
2743	__bpf_md_ptr(struct bpf_map *, map);
2744	__bpf_md_ptr(void *, key);
2745	__bpf_md_ptr(void *, value);
2746};
2747
2748int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2749void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2750int bpf_iter_prog_supported(struct bpf_prog *prog);
2751const struct bpf_func_proto *
2752bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2753int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2754int bpf_iter_new_fd(struct bpf_link *link);
2755bool bpf_link_is_iter(struct bpf_link *link);
2756struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2757int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2758void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2759			      struct seq_file *seq);
2760int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2761				struct bpf_link_info *info);
2762
2763int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2764				   struct bpf_func_state *caller,
2765				   struct bpf_func_state *callee);
2766
2767int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2768int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2769int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2770			   u64 flags);
2771int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2772			    u64 flags);
2773
2774int bpf_stackmap_extract(struct bpf_map *map, void *key, void *value, bool delete);
2775
2776int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2777				 void *key, void *value, u64 map_flags);
2778int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2779int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2780				void *key, void *value, u64 map_flags);
2781int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2782
2783int bpf_get_file_flag(int flags);
2784int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2785			     size_t actual_size);
2786
2787/* verify correctness of eBPF program */
2788int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2789
2790#ifndef CONFIG_BPF_JIT_ALWAYS_ON
2791void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2792#endif
2793
2794struct btf *bpf_get_btf_vmlinux(void);
2795
2796/* Map specifics */
2797struct xdp_frame;
2798struct sk_buff;
2799struct bpf_dtab_netdev;
2800struct bpf_cpu_map_entry;
2801
2802void __dev_flush(struct list_head *flush_list);
2803int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2804		    struct net_device *dev_rx);
2805int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2806		    struct net_device *dev_rx);
2807int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2808			  struct bpf_map *map, bool exclude_ingress);
2809int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2810			     const struct bpf_prog *xdp_prog);
2811int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2812			   const struct bpf_prog *xdp_prog,
2813			   struct bpf_map *map, bool exclude_ingress);
2814
2815void __cpu_map_flush(struct list_head *flush_list);
2816int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2817		    struct net_device *dev_rx);
2818int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2819			     struct sk_buff *skb);
2820
2821/* Return map's numa specified by userspace */
2822static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2823{
2824	return (attr->map_flags & BPF_F_NUMA_NODE) ?
2825		attr->numa_node : NUMA_NO_NODE;
2826}
2827
2828struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2829int array_map_alloc_check(union bpf_attr *attr);
2830
2831int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2832			  union bpf_attr __user *uattr);
2833int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2834			  union bpf_attr __user *uattr);
2835int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2836			      const union bpf_attr *kattr,
2837			      union bpf_attr __user *uattr);
2838int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2839				     const union bpf_attr *kattr,
2840				     union bpf_attr __user *uattr);
2841int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2842			     const union bpf_attr *kattr,
2843			     union bpf_attr __user *uattr);
2844int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2845				const union bpf_attr *kattr,
2846				union bpf_attr __user *uattr);
2847int bpf_prog_test_run_nf(struct bpf_prog *prog,
2848			 const union bpf_attr *kattr,
2849			 union bpf_attr __user *uattr);
2850bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2851		    const struct bpf_prog *prog,
2852		    struct bpf_insn_access_aux *info);
2853
2854static inline bool bpf_tracing_ctx_access(int off, int size,
2855					  enum bpf_access_type type)
2856{
2857	if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2858		return false;
2859	if (type != BPF_READ)
2860		return false;
2861	if (off % size != 0)
2862		return false;
2863	return true;
2864}
2865
2866static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2867					      enum bpf_access_type type,
2868					      const struct bpf_prog *prog,
2869					      struct bpf_insn_access_aux *info)
2870{
2871	if (!bpf_tracing_ctx_access(off, size, type))
2872		return false;
2873	return btf_ctx_access(off, size, type, prog, info);
2874}
2875
2876int btf_struct_access(struct bpf_verifier_log *log,
2877		      const struct bpf_reg_state *reg,
2878		      int off, int size, enum bpf_access_type atype,
2879		      u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2880bool btf_struct_ids_match(struct bpf_verifier_log *log,
2881			  const struct btf *btf, u32 id, int off,
2882			  const struct btf *need_btf, u32 need_type_id,
2883			  bool strict);
2884
2885int btf_distill_func_proto(struct bpf_verifier_log *log,
2886			   struct btf *btf,
2887			   const struct btf_type *func_proto,
2888			   const char *func_name,
2889			   struct btf_func_model *m);
2890
2891struct bpf_reg_state;
2892int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog);
2893int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2894			 struct btf *btf, const struct btf_type *t);
2895const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
2896				    int comp_idx, const char *tag_key);
2897int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,
2898			   int comp_idx, const char *tag_key, int last_id);
2899
2900struct bpf_prog *bpf_prog_by_id(u32 id);
2901struct bpf_link *bpf_link_by_id(u32 id);
2902
2903const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id,
2904						 const struct bpf_prog *prog);
2905void bpf_task_storage_free(struct task_struct *task);
2906void bpf_cgrp_storage_free(struct cgroup *cgroup);
2907bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2908const struct btf_func_model *
2909bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2910			 const struct bpf_insn *insn);
2911int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2912		       u16 btf_fd_idx, u8 **func_addr);
2913
2914struct bpf_core_ctx {
2915	struct bpf_verifier_log *log;
2916	const struct btf *btf;
2917};
2918
2919bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2920				const struct bpf_reg_state *reg,
2921				const char *field_name, u32 btf_id, const char *suffix);
2922
2923bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2924			       const struct btf *reg_btf, u32 reg_id,
2925			       const struct btf *arg_btf, u32 arg_id);
2926
2927int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2928		   int relo_idx, void *insn);
2929
2930static inline bool unprivileged_ebpf_enabled(void)
2931{
2932	return !sysctl_unprivileged_bpf_disabled;
2933}
2934
2935/* Not all bpf prog type has the bpf_ctx.
2936 * For the bpf prog type that has initialized the bpf_ctx,
2937 * this function can be used to decide if a kernel function
2938 * is called by a bpf program.
2939 */
2940static inline bool has_current_bpf_ctx(void)
2941{
2942	return !!current->bpf_ctx;
2943}
2944
2945void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2946
2947void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2948		     enum bpf_dynptr_type type, u32 offset, u32 size);
2949void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2950void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2951void bpf_prog_report_arena_violation(bool write, unsigned long addr, unsigned long fault_ip);
2952
2953#else /* !CONFIG_BPF_SYSCALL */
2954static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2955{
2956	return ERR_PTR(-EOPNOTSUPP);
2957}
2958
2959static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2960						     enum bpf_prog_type type,
2961						     bool attach_drv)
2962{
2963	return ERR_PTR(-EOPNOTSUPP);
2964}
2965
2966static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2967{
2968}
2969
2970static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2971{
2972}
2973
2974static inline void bpf_prog_put(struct bpf_prog *prog)
2975{
2976}
2977
2978static inline void bpf_prog_inc(struct bpf_prog *prog)
2979{
2980}
2981
2982static inline struct bpf_prog *__must_check
2983bpf_prog_inc_not_zero(struct bpf_prog *prog)
2984{
2985	return ERR_PTR(-EOPNOTSUPP);
2986}
2987
2988static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2989				 const struct bpf_link_ops *ops,
2990				 struct bpf_prog *prog, enum bpf_attach_type attach_type)
2991{
2992}
2993
2994static inline void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
2995					   const struct bpf_link_ops *ops, struct bpf_prog *prog,
2996					   enum bpf_attach_type attach_type, bool sleepable)
2997{
2998}
2999
3000static inline int bpf_link_prime(struct bpf_link *link,
3001				 struct bpf_link_primer *primer)
3002{
3003	return -EOPNOTSUPP;
3004}
3005
3006static inline int bpf_link_settle(struct bpf_link_primer *primer)
3007{
3008	return -EOPNOTSUPP;
3009}
3010
3011static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
3012{
3013}
3014
3015static inline void bpf_link_inc(struct bpf_link *link)
3016{
3017}
3018
3019static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
3020{
3021	return NULL;
3022}
3023
3024static inline void bpf_link_put(struct bpf_link *link)
3025{
3026}
3027
3028static inline int bpf_obj_get_user(const char __user *pathname, int flags)
3029{
3030	return -EOPNOTSUPP;
3031}
3032
3033static inline bool bpf_token_capable(const struct bpf_token *token, int cap)
3034{
3035	return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));
3036}
3037
3038static inline void bpf_token_inc(struct bpf_token *token)
3039{
3040}
3041
3042static inline void bpf_token_put(struct bpf_token *token)
3043{
3044}
3045
3046static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd)
3047{
3048	return ERR_PTR(-EOPNOTSUPP);
3049}
3050
3051static inline int bpf_token_get_info_by_fd(struct bpf_token *token,
3052					   const union bpf_attr *attr,
3053					   union bpf_attr __user *uattr)
3054{
3055	return -EOPNOTSUPP;
3056}
3057
3058static inline void __dev_flush(struct list_head *flush_list)
3059{
3060}
3061
3062struct xdp_frame;
3063struct bpf_dtab_netdev;
3064struct bpf_cpu_map_entry;
3065
3066static inline
3067int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
3068		    struct net_device *dev_rx)
3069{
3070	return 0;
3071}
3072
3073static inline
3074int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
3075		    struct net_device *dev_rx)
3076{
3077	return 0;
3078}
3079
3080static inline
3081int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
3082			  struct bpf_map *map, bool exclude_ingress)
3083{
3084	return 0;
3085}
3086
3087struct sk_buff;
3088
3089static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
3090					   struct sk_buff *skb,
3091					   const struct bpf_prog *xdp_prog)
3092{
3093	return 0;
3094}
3095
3096static inline
3097int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
3098			   const struct bpf_prog *xdp_prog,
3099			   struct bpf_map *map, bool exclude_ingress)
3100{
3101	return 0;
3102}
3103
3104static inline void __cpu_map_flush(struct list_head *flush_list)
3105{
3106}
3107
3108static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
3109				  struct xdp_frame *xdpf,
3110				  struct net_device *dev_rx)
3111{
3112	return 0;
3113}
3114
3115static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
3116					   struct sk_buff *skb)
3117{
3118	return -EOPNOTSUPP;
3119}
3120
3121static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
3122				enum bpf_prog_type type)
3123{
3124	return ERR_PTR(-EOPNOTSUPP);
3125}
3126
3127static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
3128					const union bpf_attr *kattr,
3129					union bpf_attr __user *uattr)
3130{
3131	return -ENOTSUPP;
3132}
3133
3134static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
3135					const union bpf_attr *kattr,
3136					union bpf_attr __user *uattr)
3137{
3138	return -ENOTSUPP;
3139}
3140
3141static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
3142					    const union bpf_attr *kattr,
3143					    union bpf_attr __user *uattr)
3144{
3145	return -ENOTSUPP;
3146}
3147
3148static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
3149						   const union bpf_attr *kattr,
3150						   union bpf_attr __user *uattr)
3151{
3152	return -ENOTSUPP;
3153}
3154
3155static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
3156					      const union bpf_attr *kattr,
3157					      union bpf_attr __user *uattr)
3158{
3159	return -ENOTSUPP;
3160}
3161
3162static inline void bpf_map_put(struct bpf_map *map)
3163{
3164}
3165
3166static inline struct bpf_prog *bpf_prog_by_id(u32 id)
3167{
3168	return ERR_PTR(-ENOTSUPP);
3169}
3170
3171static inline int btf_struct_access(struct bpf_verifier_log *log,
3172				    const struct bpf_reg_state *reg,
3173				    int off, int size, enum bpf_access_type atype,
3174				    u32 *next_btf_id, enum bpf_type_flag *flag,
3175				    const char **field_name)
3176{
3177	return -EACCES;
3178}
3179
3180static inline const struct bpf_func_proto *
3181bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
3182{
3183	return NULL;
3184}
3185
3186static inline void bpf_task_storage_free(struct task_struct *task)
3187{
3188}
3189
3190static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
3191{
3192	return false;
3193}
3194
3195static inline const struct btf_func_model *
3196bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
3197			 const struct bpf_insn *insn)
3198{
3199	return NULL;
3200}
3201
3202static inline int
3203bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
3204		   u16 btf_fd_idx, u8 **func_addr)
3205{
3206	return -ENOTSUPP;
3207}
3208
3209static inline bool unprivileged_ebpf_enabled(void)
3210{
3211	return false;
3212}
3213
3214static inline bool has_current_bpf_ctx(void)
3215{
3216	return false;
3217}
3218
3219static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
3220{
3221}
3222
3223static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
3224{
3225}
3226
3227static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
3228				   enum bpf_dynptr_type type, u32 offset, u32 size)
3229{
3230}
3231
3232static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
3233{
3234}
3235
3236static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
3237{
3238}
3239
3240static inline void bpf_prog_report_arena_violation(bool write, unsigned long addr,
3241						   unsigned long fault_ip)
3242{
3243}
3244#endif /* CONFIG_BPF_SYSCALL */
3245
3246static inline bool bpf_net_capable(void)
3247{
3248	return capable(CAP_NET_ADMIN) || capable(CAP_SYS_ADMIN);
3249}
3250
3251static __always_inline int
3252bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
3253{
3254	int ret = -EFAULT;
3255
3256	if (IS_ENABLED(CONFIG_BPF_EVENTS))
3257		ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
3258	if (unlikely(ret < 0))
3259		memset(dst, 0, size);
3260	return ret;
3261}
3262
3263void __bpf_free_used_btfs(struct btf_mod_pair *used_btfs, u32 len);
3264
3265static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
3266						 enum bpf_prog_type type)
3267{
3268	return bpf_prog_get_type_dev(ufd, type, false);
3269}
3270
3271void __bpf_free_used_maps(struct bpf_prog_aux *aux,
3272			  struct bpf_map **used_maps, u32 len);
3273
3274bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
3275
3276int bpf_prog_offload_compile(struct bpf_prog *prog);
3277void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
3278int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
3279			       struct bpf_prog *prog);
3280
3281int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
3282
3283int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
3284int bpf_map_offload_update_elem(struct bpf_map *map,
3285				void *key, void *value, u64 flags);
3286int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
3287int bpf_map_offload_get_next_key(struct bpf_map *map,
3288				 void *key, void *next_key);
3289
3290bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
3291
3292struct bpf_offload_dev *
3293bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
3294void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
3295void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
3296int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
3297				    struct net_device *netdev);
3298void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
3299				       struct net_device *netdev);
3300bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
3301
3302void unpriv_ebpf_notify(int new_state);
3303
3304#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
3305int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3306			      struct bpf_prog_aux *prog_aux);
3307void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
3308int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
3309int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
3310void bpf_dev_bound_netdev_unregister(struct net_device *dev);
3311
3312static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3313{
3314	return aux->dev_bound;
3315}
3316
3317static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
3318{
3319	return aux->offload_requested;
3320}
3321
3322bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
3323
3324static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3325{
3326	return unlikely(map->ops == &bpf_map_offload_ops);
3327}
3328
3329struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
3330void bpf_map_offload_map_free(struct bpf_map *map);
3331u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
3332int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3333			      const union bpf_attr *kattr,
3334			      union bpf_attr __user *uattr);
3335
3336int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
3337int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
3338int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
3339int sock_map_bpf_prog_query(const union bpf_attr *attr,
3340			    union bpf_attr __user *uattr);
3341int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog);
3342
3343void sock_map_unhash(struct sock *sk);
3344void sock_map_destroy(struct sock *sk);
3345void sock_map_close(struct sock *sk, long timeout);
3346#else
3347static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3348					    struct bpf_prog_aux *prog_aux)
3349{
3350	return -EOPNOTSUPP;
3351}
3352
3353static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
3354						u32 func_id)
3355{
3356	return NULL;
3357}
3358
3359static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
3360					  union bpf_attr *attr)
3361{
3362	return -EOPNOTSUPP;
3363}
3364
3365static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
3366					     struct bpf_prog *old_prog)
3367{
3368	return -EOPNOTSUPP;
3369}
3370
3371static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
3372{
3373}
3374
3375static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3376{
3377	return false;
3378}
3379
3380static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
3381{
3382	return false;
3383}
3384
3385static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
3386{
3387	return false;
3388}
3389
3390static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3391{
3392	return false;
3393}
3394
3395static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
3396{
3397	return ERR_PTR(-EOPNOTSUPP);
3398}
3399
3400static inline void bpf_map_offload_map_free(struct bpf_map *map)
3401{
3402}
3403
3404static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
3405{
3406	return 0;
3407}
3408
3409static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3410					    const union bpf_attr *kattr,
3411					    union bpf_attr __user *uattr)
3412{
3413	return -ENOTSUPP;
3414}
3415
3416#ifdef CONFIG_BPF_SYSCALL
3417static inline int sock_map_get_from_fd(const union bpf_attr *attr,
3418				       struct bpf_prog *prog)
3419{
3420	return -EINVAL;
3421}
3422
3423static inline int sock_map_prog_detach(const union bpf_attr *attr,
3424				       enum bpf_prog_type ptype)
3425{
3426	return -EOPNOTSUPP;
3427}
3428
3429static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
3430					   u64 flags)
3431{
3432	return -EOPNOTSUPP;
3433}
3434
3435static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
3436					  union bpf_attr __user *uattr)
3437{
3438	return -EINVAL;
3439}
3440
3441static inline int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
3442{
3443	return -EOPNOTSUPP;
3444}
3445#endif /* CONFIG_BPF_SYSCALL */
3446#endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
3447
3448static __always_inline void
3449bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
3450{
3451	const struct bpf_prog_array_item *item;
3452	struct bpf_prog *prog;
3453
3454	if (unlikely(!array))
3455		return;
3456
3457	item = &array->items[0];
3458	while ((prog = READ_ONCE(item->prog))) {
3459		bpf_prog_inc_misses_counter(prog);
3460		item++;
3461	}
3462}
3463
3464#if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
3465void bpf_sk_reuseport_detach(struct sock *sk);
3466int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
3467				       void *value);
3468int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
3469				       void *value, u64 map_flags);
3470#else
3471static inline void bpf_sk_reuseport_detach(struct sock *sk)
3472{
3473}
3474
3475#ifdef CONFIG_BPF_SYSCALL
3476static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
3477						     void *key, void *value)
3478{
3479	return -EOPNOTSUPP;
3480}
3481
3482static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
3483						     void *key, void *value,
3484						     u64 map_flags)
3485{
3486	return -EOPNOTSUPP;
3487}
3488#endif /* CONFIG_BPF_SYSCALL */
3489#endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
3490
3491#if defined(CONFIG_KEYS) && defined(CONFIG_BPF_SYSCALL)
3492
3493struct bpf_key *bpf_lookup_user_key(s32 serial, u64 flags);
3494struct bpf_key *bpf_lookup_system_key(u64 id);
3495void bpf_key_put(struct bpf_key *bkey);
3496int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
3497			       struct bpf_dynptr *sig_p,
3498			       struct bpf_key *trusted_keyring);
3499
3500#else
3501static inline struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags)
3502{
3503	return NULL;
3504}
3505
3506static inline struct bpf_key *bpf_lookup_system_key(u64 id)
3507{
3508	return NULL;
3509}
3510
3511static inline void bpf_key_put(struct bpf_key *bkey)
3512{
3513}
3514
3515static inline int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
3516					     struct bpf_dynptr *sig_p,
3517					     struct bpf_key *trusted_keyring)
3518{
3519	return -EOPNOTSUPP;
3520}
3521#endif /* defined(CONFIG_KEYS) && defined(CONFIG_BPF_SYSCALL) */
3522
3523/* verifier prototypes for helper functions called from eBPF programs */
3524extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
3525extern const struct bpf_func_proto bpf_map_update_elem_proto;
3526extern const struct bpf_func_proto bpf_map_delete_elem_proto;
3527extern const struct bpf_func_proto bpf_map_push_elem_proto;
3528extern const struct bpf_func_proto bpf_map_pop_elem_proto;
3529extern const struct bpf_func_proto bpf_map_peek_elem_proto;
3530extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
3531
3532extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
3533extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
3534extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
3535extern const struct bpf_func_proto bpf_tail_call_proto;
3536extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
3537extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
3538extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
3539extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
3540extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
3541extern const struct bpf_func_proto bpf_get_current_comm_proto;
3542extern const struct bpf_func_proto bpf_get_stackid_proto;
3543extern const struct bpf_func_proto bpf_get_stack_proto;
3544extern const struct bpf_func_proto bpf_get_stack_sleepable_proto;
3545extern const struct bpf_func_proto bpf_get_task_stack_proto;
3546extern const struct bpf_func_proto bpf_get_task_stack_sleepable_proto;
3547extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
3548extern const struct bpf_func_proto bpf_get_stack_proto_pe;
3549extern const struct bpf_func_proto bpf_sock_map_update_proto;
3550extern const struct bpf_func_proto bpf_sock_hash_update_proto;
3551extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
3552extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3553extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3554extern const struct bpf_func_proto bpf_current_task_under_cgroup_proto;
3555extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3556extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3557extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3558extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3559extern const struct bpf_func_proto bpf_spin_lock_proto;
3560extern const struct bpf_func_proto bpf_spin_unlock_proto;
3561extern const struct bpf_func_proto bpf_get_local_storage_proto;
3562extern const struct bpf_func_proto bpf_strtol_proto;
3563extern const struct bpf_func_proto bpf_strtoul_proto;
3564extern const struct bpf_func_proto bpf_tcp_sock_proto;
3565extern const struct bpf_func_proto bpf_jiffies64_proto;
3566extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3567extern const struct bpf_func_proto bpf_event_output_data_proto;
3568extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3569extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3570extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3571extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3572extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3573extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3574extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3575extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3576extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3577extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3578extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3579extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3580extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3581extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3582extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3583extern const struct bpf_func_proto bpf_copy_from_user_proto;
3584extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3585extern const struct bpf_func_proto bpf_snprintf_proto;
3586extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3587extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3588extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3589extern const struct bpf_func_proto bpf_sock_from_file_proto;
3590extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3591extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3592extern const struct bpf_func_proto bpf_task_storage_get_proto;
3593extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3594extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3595extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3596extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3597extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3598extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3599extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3600extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3601extern const struct bpf_func_proto bpf_find_vma_proto;
3602extern const struct bpf_func_proto bpf_loop_proto;
3603extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3604extern const struct bpf_func_proto bpf_set_retval_proto;
3605extern const struct bpf_func_proto bpf_get_retval_proto;
3606extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3607extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3608extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3609
3610const struct bpf_func_proto *tracing_prog_func_proto(
3611  enum bpf_func_id func_id, const struct bpf_prog *prog);
3612
3613/* Shared helpers among cBPF and eBPF. */
3614void bpf_user_rnd_init_once(void);
3615u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3616u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3617
3618#if defined(CONFIG_NET)
3619bool bpf_sock_common_is_valid_access(int off, int size,
3620				     enum bpf_access_type type,
3621				     struct bpf_insn_access_aux *info);
3622bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3623			      struct bpf_insn_access_aux *info);
3624u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3625				const struct bpf_insn *si,
3626				struct bpf_insn *insn_buf,
3627				struct bpf_prog *prog,
3628				u32 *target_size);
3629int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3630			       struct bpf_dynptr *ptr);
3631#else
3632static inline bool bpf_sock_common_is_valid_access(int off, int size,
3633						   enum bpf_access_type type,
3634						   struct bpf_insn_access_aux *info)
3635{
3636	return false;
3637}
3638static inline bool bpf_sock_is_valid_access(int off, int size,
3639					    enum bpf_access_type type,
3640					    struct bpf_insn_access_aux *info)
3641{
3642	return false;
3643}
3644static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3645					      const struct bpf_insn *si,
3646					      struct bpf_insn *insn_buf,
3647					      struct bpf_prog *prog,
3648					      u32 *target_size)
3649{
3650	return 0;
3651}
3652static inline int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3653					     struct bpf_dynptr *ptr)
3654{
3655	return -EOPNOTSUPP;
3656}
3657#endif
3658
3659#ifdef CONFIG_INET
3660struct sk_reuseport_kern {
3661	struct sk_buff *skb;
3662	struct sock *sk;
3663	struct sock *selected_sk;
3664	struct sock *migrating_sk;
3665	void *data_end;
3666	u32 hash;
3667	u32 reuseport_id;
3668	bool bind_inany;
3669};
3670bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3671				  struct bpf_insn_access_aux *info);
3672
3673u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3674				    const struct bpf_insn *si,
3675				    struct bpf_insn *insn_buf,
3676				    struct bpf_prog *prog,
3677				    u32 *target_size);
3678
3679bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3680				  struct bpf_insn_access_aux *info);
3681
3682u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3683				    const struct bpf_insn *si,
3684				    struct bpf_insn *insn_buf,
3685				    struct bpf_prog *prog,
3686				    u32 *target_size);
3687#else
3688static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3689						enum bpf_access_type type,
3690						struct bpf_insn_access_aux *info)
3691{
3692	return false;
3693}
3694
3695static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3696						  const struct bpf_insn *si,
3697						  struct bpf_insn *insn_buf,
3698						  struct bpf_prog *prog,
3699						  u32 *target_size)
3700{
3701	return 0;
3702}
3703static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3704						enum bpf_access_type type,
3705						struct bpf_insn_access_aux *info)
3706{
3707	return false;
3708}
3709
3710static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3711						  const struct bpf_insn *si,
3712						  struct bpf_insn *insn_buf,
3713						  struct bpf_prog *prog,
3714						  u32 *target_size)
3715{
3716	return 0;
3717}
3718#endif /* CONFIG_INET */
3719
3720enum bpf_text_poke_type {
3721	BPF_MOD_NOP,
3722	BPF_MOD_CALL,
3723	BPF_MOD_JUMP,
3724};
3725
3726int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type old_t,
3727		       enum bpf_text_poke_type new_t, void *old_addr,
3728		       void *new_addr);
3729
3730void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3731			       struct bpf_prog *new, struct bpf_prog *old);
3732
3733void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3734int bpf_arch_text_invalidate(void *dst, size_t len);
3735
3736struct btf_id_set;
3737bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3738
3739#define MAX_BPRINTF_VARARGS		12
3740#define MAX_BPRINTF_BUF			1024
3741
3742/* Per-cpu temp buffers used by printf-like helpers to store the bprintf binary
3743 * arguments representation.
3744 */
3745#define MAX_BPRINTF_BIN_ARGS	512
3746
3747struct bpf_bprintf_buffers {
3748	char bin_args[MAX_BPRINTF_BIN_ARGS];
3749	char buf[MAX_BPRINTF_BUF];
3750};
3751
3752struct bpf_bprintf_data {
3753	u32 *bin_args;
3754	char *buf;
3755	bool get_bin_args;
3756	bool get_buf;
3757};
3758
3759int bpf_bprintf_prepare(const char *fmt, u32 fmt_size, const u64 *raw_args,
3760			u32 num_args, struct bpf_bprintf_data *data);
3761void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3762int bpf_try_get_buffers(struct bpf_bprintf_buffers **bufs);
3763void bpf_put_buffers(void);
3764
3765void bpf_prog_stream_init(struct bpf_prog *prog);
3766void bpf_prog_stream_free(struct bpf_prog *prog);
3767int bpf_prog_stream_read(struct bpf_prog *prog, enum bpf_stream_id stream_id, void __user *buf, int len);
3768void bpf_stream_stage_init(struct bpf_stream_stage *ss);
3769void bpf_stream_stage_free(struct bpf_stream_stage *ss);
3770__printf(2, 3)
3771int bpf_stream_stage_printk(struct bpf_stream_stage *ss, const char *fmt, ...);
3772int bpf_stream_stage_commit(struct bpf_stream_stage *ss, struct bpf_prog *prog,
3773			    enum bpf_stream_id stream_id);
3774int bpf_stream_stage_dump_stack(struct bpf_stream_stage *ss);
3775
3776#define bpf_stream_printk(ss, ...) bpf_stream_stage_printk(&ss, __VA_ARGS__)
3777#define bpf_stream_dump_stack(ss) bpf_stream_stage_dump_stack(&ss)
3778
3779#define bpf_stream_stage(ss, prog, stream_id, expr)            \
3780	({                                                     \
3781		bpf_stream_stage_init(&ss);                    \
3782		(expr);                                        \
3783		bpf_stream_stage_commit(&ss, prog, stream_id); \
3784		bpf_stream_stage_free(&ss);                    \
3785	})
3786
3787#ifdef CONFIG_BPF_LSM
3788void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3789void bpf_cgroup_atype_put(int cgroup_atype);
3790#else
3791static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
3792static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3793#endif /* CONFIG_BPF_LSM */
3794
3795struct key;
3796
3797#ifdef CONFIG_KEYS
3798struct bpf_key {
3799	struct key *key;
3800	bool has_ref;
3801};
3802#endif /* CONFIG_KEYS */
3803
3804static inline bool type_is_alloc(u32 type)
3805{
3806	return type & MEM_ALLOC;
3807}
3808
3809static inline gfp_t bpf_memcg_flags(gfp_t flags)
3810{
3811	if (memcg_bpf_enabled())
3812		return flags | __GFP_ACCOUNT;
3813	return flags;
3814}
3815
3816static inline bool bpf_is_subprog(const struct bpf_prog *prog)
3817{
3818	return prog->aux->func_idx != 0;
3819}
3820
3821int bpf_prog_get_file_line(struct bpf_prog *prog, unsigned long ip, const char **filep,
3822			   const char **linep, int *nump);
3823struct bpf_prog *bpf_prog_find_from_stack(void);
3824
3825int bpf_insn_array_init(struct bpf_map *map, const struct bpf_prog *prog);
3826int bpf_insn_array_ready(struct bpf_map *map);
3827void bpf_insn_array_release(struct bpf_map *map);
3828void bpf_insn_array_adjust(struct bpf_map *map, u32 off, u32 len);
3829void bpf_insn_array_adjust_after_remove(struct bpf_map *map, u32 off, u32 len);
3830
3831#ifdef CONFIG_BPF_SYSCALL
3832void bpf_prog_update_insn_ptrs(struct bpf_prog *prog, u32 *offsets, void *image);
3833#else
3834static inline void
3835bpf_prog_update_insn_ptrs(struct bpf_prog *prog, u32 *offsets, void *image)
3836{
3837}
3838#endif
3839
3840static inline int bpf_map_check_op_flags(struct bpf_map *map, u64 flags, u64 allowed_flags)
3841{
3842	if (flags & ~allowed_flags)
3843		return -EINVAL;
3844
3845	if ((flags & BPF_F_LOCK) && !btf_record_has_field(map->record, BPF_SPIN_LOCK))
3846		return -EINVAL;
3847
3848	return 0;
3849}
3850
3851#endif /* _LINUX_BPF_H */