include/linux/bpf.h

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This source file includes following definitions.
map_value_has_spin_lock
check_and_init_map_lock
copy_map_value
map_to_offmap
bpf_map_offload_neutral
bpf_map_support_seq_show
bpf_ctx_record_field_size
bpf_map_flags_to_cap
bpf_map_flags_access_ok
bpf_long_memcpy
bpf_map_attr_numa_node
bpf_prog_get
bpf_prog_get_type_dev
bpf_prog_add
bpf_prog_sub
bpf_prog_put
bpf_prog_inc
bpf_prog_inc_not_zero
__bpf_prog_charge
__bpf_prog_uncharge
bpf_obj_get_user
__dev_map_lookup_elem
__dev_map_hash_lookup_elem
__dev_map_flush
dev_map_enqueue
dev_map_generic_redirect
__cpu_map_lookup_elem
__cpu_map_flush
cpu_map_enqueue
bpf_prog_get_type_path
bpf_prog_test_run_xdp
bpf_prog_test_run_skb
bpf_prog_test_run_flow_dissector
bpf_prog_get_type
bpf_prog_is_dev_bound
bpf_map_is_dev_bound
bpf_prog_offload_init
bpf_prog_is_dev_bound
bpf_map_is_dev_bound
bpf_map_offload_map_alloc
bpf_map_offload_map_free
sock_map_prog_update
sock_map_get_from_fd
__xsk_map_lookup_elem
__xsk_map_redirect
__xsk_map_flush
bpf_sk_reuseport_detach
bpf_fd_reuseport_array_lookup_elem
bpf_fd_reuseport_array_update_elem
bpf_sock_common_is_valid_access
bpf_sock_is_valid_access
bpf_sock_convert_ctx_access
bpf_tcp_sock_is_valid_access
bpf_tcp_sock_convert_ctx_access
bpf_xdp_sock_is_valid_access
bpf_xdp_sock_convert_ctx_access
   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 
   9 #include <linux/workqueue.h>
  10 #include <linux/file.h>
  11 #include <linux/percpu.h>
  12 #include <linux/err.h>
  13 #include <linux/rbtree_latch.h>
  14 #include <linux/numa.h>
  15 #include <linux/wait.h>
  16 #include <linux/u64_stats_sync.h>
  17 
  18 struct bpf_verifier_env;
  19 struct perf_event;
  20 struct bpf_prog;
  21 struct bpf_map;
  22 struct sock;
  23 struct seq_file;
  24 struct btf;
  25 struct btf_type;
  26 
  27 extern struct idr btf_idr;
  28 extern spinlock_t btf_idr_lock;
  29 
  30 /* map is generic key/value storage optionally accesible by eBPF programs */
  31 struct bpf_map_ops {
  32         /* funcs callable from userspace (via syscall) */
  33         int (*map_alloc_check)(union bpf_attr *attr);
  34         struct bpf_map *(*map_alloc)(union bpf_attr *attr);
  35         void (*map_release)(struct bpf_map *map, struct file *map_file);
  36         void (*map_free)(struct bpf_map *map);
  37         int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
  38         void (*map_release_uref)(struct bpf_map *map);
  39         void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
  40 
  41         /* funcs callable from userspace and from eBPF programs */
  42         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
  43         int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
  44         int (*map_delete_elem)(struct bpf_map *map, void *key);
  45         int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
  46         int (*map_pop_elem)(struct bpf_map *map, void *value);
  47         int (*map_peek_elem)(struct bpf_map *map, void *value);
  48 
  49         /* funcs called by prog_array and perf_event_array map */
  50         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
  51                                 int fd);
  52         void (*map_fd_put_ptr)(void *ptr);
  53         u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
  54         u32 (*map_fd_sys_lookup_elem)(void *ptr);
  55         void (*map_seq_show_elem)(struct bpf_map *map, void *key,
  56                                   struct seq_file *m);
  57         int (*map_check_btf)(const struct bpf_map *map,
  58                              const struct btf *btf,
  59                              const struct btf_type *key_type,
  60                              const struct btf_type *value_type);
  61 
  62         /* Direct value access helpers. */
  63         int (*map_direct_value_addr)(const struct bpf_map *map,
  64                                      u64 *imm, u32 off);
  65         int (*map_direct_value_meta)(const struct bpf_map *map,
  66                                      u64 imm, u32 *off);
  67 };
  68 
  69 struct bpf_map_memory {
  70         u32 pages;
  71         struct user_struct *user;
  72 };
  73 
  74 struct bpf_map {
  75         /* The first two cachelines with read-mostly members of which some
  76          * are also accessed in fast-path (e.g. ops, max_entries).
  77          */
  78         const struct bpf_map_ops *ops ____cacheline_aligned;
  79         struct bpf_map *inner_map_meta;
  80 #ifdef CONFIG_SECURITY
  81         void *security;
  82 #endif
  83         enum bpf_map_type map_type;
  84         u32 key_size;
  85         u32 value_size;
  86         u32 max_entries;
  87         u32 map_flags;
  88         int spin_lock_off; /* >=0 valid offset, <0 error */
  89         u32 id;
  90         int numa_node;
  91         u32 btf_key_type_id;
  92         u32 btf_value_type_id;
  93         struct btf *btf;
  94         struct bpf_map_memory memory;
  95         bool unpriv_array;
  96         bool frozen; /* write-once */
  97         /* 48 bytes hole */
  98 
  99         /* The 3rd and 4th cacheline with misc members to avoid false sharing
 100          * particularly with refcounting.
 101          */
 102         atomic_t refcnt ____cacheline_aligned;
 103         atomic_t usercnt;
 104         struct work_struct work;
 105         char name[BPF_OBJ_NAME_LEN];
 106 };
 107 
 108 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
 109 {
 110         return map->spin_lock_off >= 0;
 111 }
 112 
 113 static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
 114 {
 115         if (likely(!map_value_has_spin_lock(map)))
 116                 return;
 117         *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
 118                 (struct bpf_spin_lock){};
 119 }
 120 
 121 /* copy everything but bpf_spin_lock */
 122 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
 123 {
 124         if (unlikely(map_value_has_spin_lock(map))) {
 125                 u32 off = map->spin_lock_off;
 126 
 127                 memcpy(dst, src, off);
 128                 memcpy(dst + off + sizeof(struct bpf_spin_lock),
 129                        src + off + sizeof(struct bpf_spin_lock),
 130                        map->value_size - off - sizeof(struct bpf_spin_lock));
 131         } else {
 132                 memcpy(dst, src, map->value_size);
 133         }
 134 }
 135 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
 136                            bool lock_src);
 137 
 138 struct bpf_offload_dev;
 139 struct bpf_offloaded_map;
 140 
 141 struct bpf_map_dev_ops {
 142         int (*map_get_next_key)(struct bpf_offloaded_map *map,
 143                                 void *key, void *next_key);
 144         int (*map_lookup_elem)(struct bpf_offloaded_map *map,
 145                                void *key, void *value);
 146         int (*map_update_elem)(struct bpf_offloaded_map *map,
 147                                void *key, void *value, u64 flags);
 148         int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
 149 };
 150 
 151 struct bpf_offloaded_map {
 152         struct bpf_map map;
 153         struct net_device *netdev;
 154         const struct bpf_map_dev_ops *dev_ops;
 155         void *dev_priv;
 156         struct list_head offloads;
 157 };
 158 
 159 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
 160 {
 161         return container_of(map, struct bpf_offloaded_map, map);
 162 }
 163 
 164 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
 165 {
 166         return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
 167 }
 168 
 169 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
 170 {
 171         return map->btf && map->ops->map_seq_show_elem;
 172 }
 173 
 174 int map_check_no_btf(const struct bpf_map *map,
 175                      const struct btf *btf,
 176                      const struct btf_type *key_type,
 177                      const struct btf_type *value_type);
 178 
 179 extern const struct bpf_map_ops bpf_map_offload_ops;
 180 
 181 /* function argument constraints */
 182 enum bpf_arg_type {
 183         ARG_DONTCARE = 0,       /* unused argument in helper function */
 184 
 185         /* the following constraints used to prototype
 186          * bpf_map_lookup/update/delete_elem() functions
 187          */
 188         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
 189         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
 190         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
 191         ARG_PTR_TO_UNINIT_MAP_VALUE,    /* pointer to valid memory used to store a map value */
 192         ARG_PTR_TO_MAP_VALUE_OR_NULL,   /* pointer to stack used as map value or NULL */
 193 
 194         /* the following constraints used to prototype bpf_memcmp() and other
 195          * functions that access data on eBPF program stack
 196          */
 197         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
 198         ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
 199         ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
 200                                  * helper function must fill all bytes or clear
 201                                  * them in error case.
 202                                  */
 203 
 204         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
 205         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
 206 
 207         ARG_PTR_TO_CTX,         /* pointer to context */
 208         ARG_ANYTHING,           /* any (initialized) argument is ok */
 209         ARG_PTR_TO_SPIN_LOCK,   /* pointer to bpf_spin_lock */
 210         ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
 211         ARG_PTR_TO_INT,         /* pointer to int */
 212         ARG_PTR_TO_LONG,        /* pointer to long */
 213         ARG_PTR_TO_SOCKET,      /* pointer to bpf_sock (fullsock) */
 214 };
 215 
 216 /* type of values returned from helper functions */
 217 enum bpf_return_type {
 218         RET_INTEGER,                    /* function returns integer */
 219         RET_VOID,                       /* function doesn't return anything */
 220         RET_PTR_TO_MAP_VALUE,           /* returns a pointer to map elem value */
 221         RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
 222         RET_PTR_TO_SOCKET_OR_NULL,      /* returns a pointer to a socket or NULL */
 223         RET_PTR_TO_TCP_SOCK_OR_NULL,    /* returns a pointer to a tcp_sock or NULL */
 224         RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
 225 };
 226 
 227 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 228  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 229  * instructions after verifying
 230  */
 231 struct bpf_func_proto {
 232         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 233         bool gpl_only;
 234         bool pkt_access;
 235         enum bpf_return_type ret_type;
 236         enum bpf_arg_type arg1_type;
 237         enum bpf_arg_type arg2_type;
 238         enum bpf_arg_type arg3_type;
 239         enum bpf_arg_type arg4_type;
 240         enum bpf_arg_type arg5_type;
 241 };
 242 
 243 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 244  * the first argument to eBPF programs.
 245  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 246  */
 247 struct bpf_context;
 248 
 249 enum bpf_access_type {
 250         BPF_READ = 1,
 251         BPF_WRITE = 2
 252 };
 253 
 254 /* types of values stored in eBPF registers */
 255 /* Pointer types represent:
 256  * pointer
 257  * pointer + imm
 258  * pointer + (u16) var
 259  * pointer + (u16) var + imm
 260  * if (range > 0) then [ptr, ptr + range - off) is safe to access
 261  * if (id > 0) means that some 'var' was added
 262  * if (off > 0) means that 'imm' was added
 263  */
 264 enum bpf_reg_type {
 265         NOT_INIT = 0,            /* nothing was written into register */
 266         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
 267         PTR_TO_CTX,              /* reg points to bpf_context */
 268         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
 269         PTR_TO_MAP_VALUE,        /* reg points to map element value */
 270         PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
 271         PTR_TO_STACK,            /* reg == frame_pointer + offset */
 272         PTR_TO_PACKET_META,      /* skb->data - meta_len */
 273         PTR_TO_PACKET,           /* reg points to skb->data */
 274         PTR_TO_PACKET_END,       /* skb->data + headlen */
 275         PTR_TO_FLOW_KEYS,        /* reg points to bpf_flow_keys */
 276         PTR_TO_SOCKET,           /* reg points to struct bpf_sock */
 277         PTR_TO_SOCKET_OR_NULL,   /* reg points to struct bpf_sock or NULL */
 278         PTR_TO_SOCK_COMMON,      /* reg points to sock_common */
 279         PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
 280         PTR_TO_TCP_SOCK,         /* reg points to struct tcp_sock */
 281         PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
 282         PTR_TO_TP_BUFFER,        /* reg points to a writable raw tp's buffer */
 283         PTR_TO_XDP_SOCK,         /* reg points to struct xdp_sock */
 284 };
 285 
 286 /* The information passed from prog-specific *_is_valid_access
 287  * back to the verifier.
 288  */
 289 struct bpf_insn_access_aux {
 290         enum bpf_reg_type reg_type;
 291         int ctx_field_size;
 292 };
 293 
 294 static inline void
 295 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
 296 {
 297         aux->ctx_field_size = size;
 298 }
 299 
 300 struct bpf_prog_ops {
 301         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
 302                         union bpf_attr __user *uattr);
 303 };
 304 
 305 struct bpf_verifier_ops {
 306         /* return eBPF function prototype for verification */
 307         const struct bpf_func_proto *
 308         (*get_func_proto)(enum bpf_func_id func_id,
 309                           const struct bpf_prog *prog);
 310 
 311         /* return true if 'size' wide access at offset 'off' within bpf_context
 312          * with 'type' (read or write) is allowed
 313          */
 314         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
 315                                 const struct bpf_prog *prog,
 316                                 struct bpf_insn_access_aux *info);
 317         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
 318                             const struct bpf_prog *prog);
 319         int (*gen_ld_abs)(const struct bpf_insn *orig,
 320                           struct bpf_insn *insn_buf);
 321         u32 (*convert_ctx_access)(enum bpf_access_type type,
 322                                   const struct bpf_insn *src,
 323                                   struct bpf_insn *dst,
 324                                   struct bpf_prog *prog, u32 *target_size);
 325 };
 326 
 327 struct bpf_prog_offload_ops {
 328         /* verifier basic callbacks */
 329         int (*insn_hook)(struct bpf_verifier_env *env,
 330                          int insn_idx, int prev_insn_idx);
 331         int (*finalize)(struct bpf_verifier_env *env);
 332         /* verifier optimization callbacks (called after .finalize) */
 333         int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
 334                             struct bpf_insn *insn);
 335         int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
 336         /* program management callbacks */
 337         int (*prepare)(struct bpf_prog *prog);
 338         int (*translate)(struct bpf_prog *prog);
 339         void (*destroy)(struct bpf_prog *prog);
 340 };
 341 
 342 struct bpf_prog_offload {
 343         struct bpf_prog         *prog;
 344         struct net_device       *netdev;
 345         struct bpf_offload_dev  *offdev;
 346         void                    *dev_priv;
 347         struct list_head        offloads;
 348         bool                    dev_state;
 349         bool                    opt_failed;
 350         void                    *jited_image;
 351         u32                     jited_len;
 352 };
 353 
 354 enum bpf_cgroup_storage_type {
 355         BPF_CGROUP_STORAGE_SHARED,
 356         BPF_CGROUP_STORAGE_PERCPU,
 357         __BPF_CGROUP_STORAGE_MAX
 358 };
 359 
 360 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
 361 
 362 struct bpf_prog_stats {
 363         u64 cnt;
 364         u64 nsecs;
 365         struct u64_stats_sync syncp;
 366 };
 367 
 368 struct bpf_prog_aux {
 369         atomic_t refcnt;
 370         u32 used_map_cnt;
 371         u32 max_ctx_offset;
 372         u32 max_pkt_offset;
 373         u32 max_tp_access;
 374         u32 stack_depth;
 375         u32 id;
 376         u32 func_cnt; /* used by non-func prog as the number of func progs */
 377         u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
 378         bool verifier_zext; /* Zero extensions has been inserted by verifier. */
 379         bool offload_requested;
 380         struct bpf_prog **func;
 381         void *jit_data; /* JIT specific data. arch dependent */
 382         struct latch_tree_node ksym_tnode;
 383         struct list_head ksym_lnode;
 384         const struct bpf_prog_ops *ops;
 385         struct bpf_map **used_maps;
 386         struct bpf_prog *prog;
 387         struct user_struct *user;
 388         u64 load_time; /* ns since boottime */
 389         struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
 390         char name[BPF_OBJ_NAME_LEN];
 391 #ifdef CONFIG_SECURITY
 392         void *security;
 393 #endif
 394         struct bpf_prog_offload *offload;
 395         struct btf *btf;
 396         struct bpf_func_info *func_info;
 397         /* bpf_line_info loaded from userspace.  linfo->insn_off
 398          * has the xlated insn offset.
 399          * Both the main and sub prog share the same linfo.
 400          * The subprog can access its first linfo by
 401          * using the linfo_idx.
 402          */
 403         struct bpf_line_info *linfo;
 404         /* jited_linfo is the jited addr of the linfo.  It has a
 405          * one to one mapping to linfo:
 406          * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
 407          * Both the main and sub prog share the same jited_linfo.
 408          * The subprog can access its first jited_linfo by
 409          * using the linfo_idx.
 410          */
 411         void **jited_linfo;
 412         u32 func_info_cnt;
 413         u32 nr_linfo;
 414         /* subprog can use linfo_idx to access its first linfo and
 415          * jited_linfo.
 416          * main prog always has linfo_idx == 0
 417          */
 418         u32 linfo_idx;
 419         struct bpf_prog_stats __percpu *stats;
 420         union {
 421                 struct work_struct work;
 422                 struct rcu_head rcu;
 423         };
 424 };
 425 
 426 struct bpf_array {
 427         struct bpf_map map;
 428         u32 elem_size;
 429         u32 index_mask;
 430         /* 'ownership' of prog_array is claimed by the first program that
 431          * is going to use this map or by the first program which FD is stored
 432          * in the map to make sure that all callers and callees have the same
 433          * prog_type and JITed flag
 434          */
 435         enum bpf_prog_type owner_prog_type;
 436         bool owner_jited;
 437         union {
 438                 char value[0] __aligned(8);
 439                 void *ptrs[0] __aligned(8);
 440                 void __percpu *pptrs[0] __aligned(8);
 441         };
 442 };
 443 
 444 #define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
 445 #define MAX_TAIL_CALL_CNT 32
 446 
 447 #define BPF_F_ACCESS_MASK       (BPF_F_RDONLY |         \
 448                                  BPF_F_RDONLY_PROG |    \
 449                                  BPF_F_WRONLY |         \
 450                                  BPF_F_WRONLY_PROG)
 451 
 452 #define BPF_MAP_CAN_READ        BIT(0)
 453 #define BPF_MAP_CAN_WRITE       BIT(1)
 454 
 455 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
 456 {
 457         u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
 458 
 459         /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
 460          * not possible.
 461          */
 462         if (access_flags & BPF_F_RDONLY_PROG)
 463                 return BPF_MAP_CAN_READ;
 464         else if (access_flags & BPF_F_WRONLY_PROG)
 465                 return BPF_MAP_CAN_WRITE;
 466         else
 467                 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
 468 }
 469 
 470 static inline bool bpf_map_flags_access_ok(u32 access_flags)
 471 {
 472         return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
 473                (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
 474 }
 475 
 476 struct bpf_event_entry {
 477         struct perf_event *event;
 478         struct file *perf_file;
 479         struct file *map_file;
 480         struct rcu_head rcu;
 481 };
 482 
 483 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
 484 int bpf_prog_calc_tag(struct bpf_prog *fp);
 485 
 486 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
 487 
 488 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
 489                                         unsigned long off, unsigned long len);
 490 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
 491                                         const struct bpf_insn *src,
 492                                         struct bpf_insn *dst,
 493                                         struct bpf_prog *prog,
 494                                         u32 *target_size);
 495 
 496 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
 497                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
 498 
 499 /* an array of programs to be executed under rcu_lock.
 500  *
 501  * Typical usage:
 502  * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN);
 503  *
 504  * the structure returned by bpf_prog_array_alloc() should be populated
 505  * with program pointers and the last pointer must be NULL.
 506  * The user has to keep refcnt on the program and make sure the program
 507  * is removed from the array before bpf_prog_put().
 508  * The 'struct bpf_prog_array *' should only be replaced with xchg()
 509  * since other cpus are walking the array of pointers in parallel.
 510  */
 511 struct bpf_prog_array_item {
 512         struct bpf_prog *prog;
 513         struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
 514 };
 515 
 516 struct bpf_prog_array {
 517         struct rcu_head rcu;
 518         struct bpf_prog_array_item items[0];
 519 };
 520 
 521 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
 522 void bpf_prog_array_free(struct bpf_prog_array *progs);
 523 int bpf_prog_array_length(struct bpf_prog_array *progs);
 524 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
 525 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
 526                                 __u32 __user *prog_ids, u32 cnt);
 527 
 528 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
 529                                 struct bpf_prog *old_prog);
 530 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
 531                              u32 *prog_ids, u32 request_cnt,
 532                              u32 *prog_cnt);
 533 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
 534                         struct bpf_prog *exclude_prog,
 535                         struct bpf_prog *include_prog,
 536                         struct bpf_prog_array **new_array);
 537 
 538 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
 539         ({                                              \
 540                 struct bpf_prog_array_item *_item;      \
 541                 struct bpf_prog *_prog;                 \
 542                 struct bpf_prog_array *_array;          \
 543                 u32 _ret = 1;                           \
 544                 preempt_disable();                      \
 545                 rcu_read_lock();                        \
 546                 _array = rcu_dereference(array);        \
 547                 if (unlikely(check_non_null && !_array))\
 548                         goto _out;                      \
 549                 _item = &_array->items[0];              \
 550                 while ((_prog = READ_ONCE(_item->prog))) {              \
 551                         bpf_cgroup_storage_set(_item->cgroup_storage);  \
 552                         _ret &= func(_prog, ctx);       \
 553                         _item++;                        \
 554                 }                                       \
 555 _out:                                                   \
 556                 rcu_read_unlock();                      \
 557                 preempt_enable();                       \
 558                 _ret;                                   \
 559          })
 560 
 561 /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
 562  * so BPF programs can request cwr for TCP packets.
 563  *
 564  * Current cgroup skb programs can only return 0 or 1 (0 to drop the
 565  * packet. This macro changes the behavior so the low order bit
 566  * indicates whether the packet should be dropped (0) or not (1)
 567  * and the next bit is a congestion notification bit. This could be
 568  * used by TCP to call tcp_enter_cwr()
 569  *
 570  * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
 571  *   0: drop packet
 572  *   1: keep packet
 573  *   2: drop packet and cn
 574  *   3: keep packet and cn
 575  *
 576  * This macro then converts it to one of the NET_XMIT or an error
 577  * code that is then interpreted as drop packet (and no cn):
 578  *   0: NET_XMIT_SUCCESS  skb should be transmitted
 579  *   1: NET_XMIT_DROP     skb should be dropped and cn
 580  *   2: NET_XMIT_CN       skb should be transmitted and cn
 581  *   3: -EPERM            skb should be dropped
 582  */
 583 #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func)         \
 584         ({                                              \
 585                 struct bpf_prog_array_item *_item;      \
 586                 struct bpf_prog *_prog;                 \
 587                 struct bpf_prog_array *_array;          \
 588                 u32 ret;                                \
 589                 u32 _ret = 1;                           \
 590                 u32 _cn = 0;                            \
 591                 preempt_disable();                      \
 592                 rcu_read_lock();                        \
 593                 _array = rcu_dereference(array);        \
 594                 _item = &_array->items[0];              \
 595                 while ((_prog = READ_ONCE(_item->prog))) {              \
 596                         bpf_cgroup_storage_set(_item->cgroup_storage);  \
 597                         ret = func(_prog, ctx);         \
 598                         _ret &= (ret & 1);              \
 599                         _cn |= (ret & 2);               \
 600                         _item++;                        \
 601                 }                                       \
 602                 rcu_read_unlock();                      \
 603                 preempt_enable();                       \
 604                 if (_ret)                               \
 605                         _ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS);  \
 606                 else                                    \
 607                         _ret = (_cn ? NET_XMIT_DROP : -EPERM);          \
 608                 _ret;                                   \
 609         })
 610 
 611 #define BPF_PROG_RUN_ARRAY(array, ctx, func)            \
 612         __BPF_PROG_RUN_ARRAY(array, ctx, func, false)
 613 
 614 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)      \
 615         __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
 616 
 617 #ifdef CONFIG_BPF_SYSCALL
 618 DECLARE_PER_CPU(int, bpf_prog_active);
 619 
 620 extern const struct file_operations bpf_map_fops;
 621 extern const struct file_operations bpf_prog_fops;
 622 
 623 #define BPF_PROG_TYPE(_id, _name) \
 624         extern const struct bpf_prog_ops _name ## _prog_ops; \
 625         extern const struct bpf_verifier_ops _name ## _verifier_ops;
 626 #define BPF_MAP_TYPE(_id, _ops) \
 627         extern const struct bpf_map_ops _ops;
 628 #include <linux/bpf_types.h>
 629 #undef BPF_PROG_TYPE
 630 #undef BPF_MAP_TYPE
 631 
 632 extern const struct bpf_prog_ops bpf_offload_prog_ops;
 633 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
 634 extern const struct bpf_verifier_ops xdp_analyzer_ops;
 635 
 636 struct bpf_prog *bpf_prog_get(u32 ufd);
 637 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
 638                                        bool attach_drv);
 639 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
 640 void bpf_prog_sub(struct bpf_prog *prog, int i);
 641 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
 642 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
 643 void bpf_prog_put(struct bpf_prog *prog);
 644 int __bpf_prog_charge(struct user_struct *user, u32 pages);
 645 void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
 646 
 647 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
 648 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
 649 
 650 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
 651 struct bpf_map *__bpf_map_get(struct fd f);
 652 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref);
 653 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map,
 654                                                    bool uref);
 655 void bpf_map_put_with_uref(struct bpf_map *map);
 656 void bpf_map_put(struct bpf_map *map);
 657 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
 658 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
 659 int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
 660 void bpf_map_charge_finish(struct bpf_map_memory *mem);
 661 void bpf_map_charge_move(struct bpf_map_memory *dst,
 662                          struct bpf_map_memory *src);
 663 void *bpf_map_area_alloc(u64 size, int numa_node);
 664 void bpf_map_area_free(void *base);
 665 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
 666 
 667 extern int sysctl_unprivileged_bpf_disabled;
 668 
 669 int bpf_map_new_fd(struct bpf_map *map, int flags);
 670 int bpf_prog_new_fd(struct bpf_prog *prog);
 671 
 672 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
 673 int bpf_obj_get_user(const char __user *pathname, int flags);
 674 
 675 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
 676 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
 677 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
 678                            u64 flags);
 679 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
 680                             u64 flags);
 681 
 682 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
 683 
 684 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
 685                                  void *key, void *value, u64 map_flags);
 686 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 687 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
 688                                 void *key, void *value, u64 map_flags);
 689 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 690 
 691 int bpf_get_file_flag(int flags);
 692 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
 693                              size_t actual_size);
 694 
 695 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
 696  * forced to use 'long' read/writes to try to atomically copy long counters.
 697  * Best-effort only.  No barriers here, since it _will_ race with concurrent
 698  * updates from BPF programs. Called from bpf syscall and mostly used with
 699  * size 8 or 16 bytes, so ask compiler to inline it.
 700  */
 701 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
 702 {
 703         const long *lsrc = src;
 704         long *ldst = dst;
 705 
 706         size /= sizeof(long);
 707         while (size--)
 708                 *ldst++ = *lsrc++;
 709 }
 710 
 711 /* verify correctness of eBPF program */
 712 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
 713               union bpf_attr __user *uattr);
 714 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
 715 
 716 /* Map specifics */
 717 struct xdp_buff;
 718 struct sk_buff;
 719 
 720 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
 721 struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
 722 void __dev_map_flush(struct bpf_map *map);
 723 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
 724                     struct net_device *dev_rx);
 725 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
 726                              struct bpf_prog *xdp_prog);
 727 
 728 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
 729 void __cpu_map_flush(struct bpf_map *map);
 730 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
 731                     struct net_device *dev_rx);
 732 
 733 /* Return map's numa specified by userspace */
 734 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
 735 {
 736         return (attr->map_flags & BPF_F_NUMA_NODE) ?
 737                 attr->numa_node : NUMA_NO_NODE;
 738 }
 739 
 740 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
 741 int array_map_alloc_check(union bpf_attr *attr);
 742 
 743 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
 744                           union bpf_attr __user *uattr);
 745 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 746                           union bpf_attr __user *uattr);
 747 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
 748                                      const union bpf_attr *kattr,
 749                                      union bpf_attr __user *uattr);
 750 #else /* !CONFIG_BPF_SYSCALL */
 751 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
 752 {
 753         return ERR_PTR(-EOPNOTSUPP);
 754 }
 755 
 756 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
 757                                                      enum bpf_prog_type type,
 758                                                      bool attach_drv)
 759 {
 760         return ERR_PTR(-EOPNOTSUPP);
 761 }
 762 
 763 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
 764                                                           int i)
 765 {
 766         return ERR_PTR(-EOPNOTSUPP);
 767 }
 768 
 769 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
 770 {
 771 }
 772 
 773 static inline void bpf_prog_put(struct bpf_prog *prog)
 774 {
 775 }
 776 
 777 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog)
 778 {
 779         return ERR_PTR(-EOPNOTSUPP);
 780 }
 781 
 782 static inline struct bpf_prog *__must_check
 783 bpf_prog_inc_not_zero(struct bpf_prog *prog)
 784 {
 785         return ERR_PTR(-EOPNOTSUPP);
 786 }
 787 
 788 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages)
 789 {
 790         return 0;
 791 }
 792 
 793 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
 794 {
 795 }
 796 
 797 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
 798 {
 799         return -EOPNOTSUPP;
 800 }
 801 
 802 static inline struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
 803                                                        u32 key)
 804 {
 805         return NULL;
 806 }
 807 
 808 static inline struct net_device  *__dev_map_hash_lookup_elem(struct bpf_map *map,
 809                                                              u32 key)
 810 {
 811         return NULL;
 812 }
 813 
 814 static inline void __dev_map_flush(struct bpf_map *map)
 815 {
 816 }
 817 
 818 struct xdp_buff;
 819 struct bpf_dtab_netdev;
 820 
 821 static inline
 822 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
 823                     struct net_device *dev_rx)
 824 {
 825         return 0;
 826 }
 827 
 828 struct sk_buff;
 829 
 830 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
 831                                            struct sk_buff *skb,
 832                                            struct bpf_prog *xdp_prog)
 833 {
 834         return 0;
 835 }
 836 
 837 static inline
 838 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
 839 {
 840         return NULL;
 841 }
 842 
 843 static inline void __cpu_map_flush(struct bpf_map *map)
 844 {
 845 }
 846 
 847 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
 848                                   struct xdp_buff *xdp,
 849                                   struct net_device *dev_rx)
 850 {
 851         return 0;
 852 }
 853 
 854 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
 855                                 enum bpf_prog_type type)
 856 {
 857         return ERR_PTR(-EOPNOTSUPP);
 858 }
 859 
 860 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
 861                                         const union bpf_attr *kattr,
 862                                         union bpf_attr __user *uattr)
 863 {
 864         return -ENOTSUPP;
 865 }
 866 
 867 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
 868                                         const union bpf_attr *kattr,
 869                                         union bpf_attr __user *uattr)
 870 {
 871         return -ENOTSUPP;
 872 }
 873 
 874 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
 875                                                    const union bpf_attr *kattr,
 876                                                    union bpf_attr __user *uattr)
 877 {
 878         return -ENOTSUPP;
 879 }
 880 #endif /* CONFIG_BPF_SYSCALL */
 881 
 882 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
 883                                                  enum bpf_prog_type type)
 884 {
 885         return bpf_prog_get_type_dev(ufd, type, false);
 886 }
 887 
 888 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
 889 
 890 int bpf_prog_offload_compile(struct bpf_prog *prog);
 891 void bpf_prog_offload_destroy(struct bpf_prog *prog);
 892 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
 893                                struct bpf_prog *prog);
 894 
 895 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
 896 
 897 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
 898 int bpf_map_offload_update_elem(struct bpf_map *map,
 899                                 void *key, void *value, u64 flags);
 900 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
 901 int bpf_map_offload_get_next_key(struct bpf_map *map,
 902                                  void *key, void *next_key);
 903 
 904 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
 905 
 906 struct bpf_offload_dev *
 907 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
 908 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
 909 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
 910 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
 911                                     struct net_device *netdev);
 912 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
 913                                        struct net_device *netdev);
 914 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
 915 
 916 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
 917 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
 918 
 919 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
 920 {
 921         return aux->offload_requested;
 922 }
 923 
 924 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
 925 {
 926         return unlikely(map->ops == &bpf_map_offload_ops);
 927 }
 928 
 929 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
 930 void bpf_map_offload_map_free(struct bpf_map *map);
 931 #else
 932 static inline int bpf_prog_offload_init(struct bpf_prog *prog,
 933                                         union bpf_attr *attr)
 934 {
 935         return -EOPNOTSUPP;
 936 }
 937 
 938 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
 939 {
 940         return false;
 941 }
 942 
 943 static inline bool bpf_map_is_dev_bound(struct bpf_map *map)
 944 {
 945         return false;
 946 }
 947 
 948 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
 949 {
 950         return ERR_PTR(-EOPNOTSUPP);
 951 }
 952 
 953 static inline void bpf_map_offload_map_free(struct bpf_map *map)
 954 {
 955 }
 956 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
 957 
 958 #if defined(CONFIG_BPF_STREAM_PARSER)
 959 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which);
 960 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
 961 #else
 962 static inline int sock_map_prog_update(struct bpf_map *map,
 963                                        struct bpf_prog *prog, u32 which)
 964 {
 965         return -EOPNOTSUPP;
 966 }
 967 
 968 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
 969                                        struct bpf_prog *prog)
 970 {
 971         return -EINVAL;
 972 }
 973 #endif
 974 
 975 #if defined(CONFIG_XDP_SOCKETS)
 976 struct xdp_sock;
 977 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key);
 978 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
 979                        struct xdp_sock *xs);
 980 void __xsk_map_flush(struct bpf_map *map);
 981 #else
 982 struct xdp_sock;
 983 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
 984                                                      u32 key)
 985 {
 986         return NULL;
 987 }
 988 
 989 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
 990                                      struct xdp_sock *xs)
 991 {
 992         return -EOPNOTSUPP;
 993 }
 994 
 995 static inline void __xsk_map_flush(struct bpf_map *map)
 996 {
 997 }
 998 #endif
 999 
1000 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
1001 void bpf_sk_reuseport_detach(struct sock *sk);
1002 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
1003                                        void *value);
1004 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
1005                                        void *value, u64 map_flags);
1006 #else
1007 static inline void bpf_sk_reuseport_detach(struct sock *sk)
1008 {
1009 }
1010 
1011 #ifdef CONFIG_BPF_SYSCALL
1012 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
1013                                                      void *key, void *value)
1014 {
1015         return -EOPNOTSUPP;
1016 }
1017 
1018 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
1019                                                      void *key, void *value,
1020                                                      u64 map_flags)
1021 {
1022         return -EOPNOTSUPP;
1023 }
1024 #endif /* CONFIG_BPF_SYSCALL */
1025 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
1026 
1027 /* verifier prototypes for helper functions called from eBPF programs */
1028 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
1029 extern const struct bpf_func_proto bpf_map_update_elem_proto;
1030 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
1031 extern const struct bpf_func_proto bpf_map_push_elem_proto;
1032 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
1033 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
1034 
1035 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
1036 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
1037 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
1038 extern const struct bpf_func_proto bpf_tail_call_proto;
1039 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
1040 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
1041 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
1042 extern const struct bpf_func_proto bpf_get_current_comm_proto;
1043 extern const struct bpf_func_proto bpf_get_stackid_proto;
1044 extern const struct bpf_func_proto bpf_get_stack_proto;
1045 extern const struct bpf_func_proto bpf_sock_map_update_proto;
1046 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
1047 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
1048 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
1049 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
1050 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
1051 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
1052 extern const struct bpf_func_proto bpf_spin_lock_proto;
1053 extern const struct bpf_func_proto bpf_spin_unlock_proto;
1054 extern const struct bpf_func_proto bpf_get_local_storage_proto;
1055 extern const struct bpf_func_proto bpf_strtol_proto;
1056 extern const struct bpf_func_proto bpf_strtoul_proto;
1057 extern const struct bpf_func_proto bpf_tcp_sock_proto;
1058 
1059 /* Shared helpers among cBPF and eBPF. */
1060 void bpf_user_rnd_init_once(void);
1061 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1062 
1063 #if defined(CONFIG_NET)
1064 bool bpf_sock_common_is_valid_access(int off, int size,
1065                                      enum bpf_access_type type,
1066                                      struct bpf_insn_access_aux *info);
1067 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1068                               struct bpf_insn_access_aux *info);
1069 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1070                                 const struct bpf_insn *si,
1071                                 struct bpf_insn *insn_buf,
1072                                 struct bpf_prog *prog,
1073                                 u32 *target_size);
1074 #else
1075 static inline bool bpf_sock_common_is_valid_access(int off, int size,
1076                                                    enum bpf_access_type type,
1077                                                    struct bpf_insn_access_aux *info)
1078 {
1079         return false;
1080 }
1081 static inline bool bpf_sock_is_valid_access(int off, int size,
1082                                             enum bpf_access_type type,
1083                                             struct bpf_insn_access_aux *info)
1084 {
1085         return false;
1086 }
1087 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
1088                                               const struct bpf_insn *si,
1089                                               struct bpf_insn *insn_buf,
1090                                               struct bpf_prog *prog,
1091                                               u32 *target_size)
1092 {
1093         return 0;
1094 }
1095 #endif
1096 
1097 #ifdef CONFIG_INET
1098 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1099                                   struct bpf_insn_access_aux *info);
1100 
1101 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1102                                     const struct bpf_insn *si,
1103                                     struct bpf_insn *insn_buf,
1104                                     struct bpf_prog *prog,
1105                                     u32 *target_size);
1106 
1107 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
1108                                   struct bpf_insn_access_aux *info);
1109 
1110 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1111                                     const struct bpf_insn *si,
1112                                     struct bpf_insn *insn_buf,
1113                                     struct bpf_prog *prog,
1114                                     u32 *target_size);
1115 #else
1116 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
1117                                                 enum bpf_access_type type,
1118                                                 struct bpf_insn_access_aux *info)
1119 {
1120         return false;
1121 }
1122 
1123 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
1124                                                   const struct bpf_insn *si,
1125                                                   struct bpf_insn *insn_buf,
1126                                                   struct bpf_prog *prog,
1127                                                   u32 *target_size)
1128 {
1129         return 0;
1130 }
1131 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
1132                                                 enum bpf_access_type type,
1133                                                 struct bpf_insn_access_aux *info)
1134 {
1135         return false;
1136 }
1137 
1138 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
1139                                                   const struct bpf_insn *si,
1140                                                   struct bpf_insn *insn_buf,
1141                                                   struct bpf_prog *prog,
1142                                                   u32 *target_size)
1143 {
1144         return 0;
1145 }
1146 #endif /* CONFIG_INET */
1147 
1148 #endif /* _LINUX_BPF_H */
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root/include/linux/bpf.h

INCLUDED FROM

DEFINITIONS
