drivers/net/tap/tap_bpf.h

   1 /* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2  * Copyright 2017 Mellanox Technologies, Ltd.
   3  */
   4
   5 #ifndef __TAP_BPF_H__
   6 #define __TAP_BPF_H__
   7
   8 #include <tap_autoconf.h>
   9
  10 #ifdef HAVE_BPF_PROG_LOAD
  11 #include <linux/bpf.h>
  12 #else
  13 /* BPF_MAP_UPDATE_ELEM command flags */
  14 #define BPF_ANY 0 /* create a new element or update an existing */
  15
  16 /* BPF architecture instruction struct */
  17 struct bpf_insn {
  18         __u8    code;
  19         __u8    dst_reg:4;
  20         __u8    src_reg:4;
  21         __s16   off;
  22         __s32   imm; /* immediate value */
  23 };
  24
  25 /* BPF program types */
  26 enum bpf_prog_type {
  27         BPF_PROG_TYPE_UNSPEC,
  28         BPF_PROG_TYPE_SOCKET_FILTER,
  29         BPF_PROG_TYPE_KPROBE,
  30         BPF_PROG_TYPE_SCHED_CLS,
  31         BPF_PROG_TYPE_SCHED_ACT,
  32 };
  33
  34 /* BPF commands types */
  35 enum bpf_cmd {
  36         BPF_MAP_CREATE,
  37         BPF_MAP_LOOKUP_ELEM,
  38         BPF_MAP_UPDATE_ELEM,
  39         BPF_MAP_DELETE_ELEM,
  40         BPF_MAP_GET_NEXT_KEY,
  41         BPF_PROG_LOAD,
  42 };
  43
  44 /* BPF maps types */
  45 enum bpf_map_type {
  46         BPF_MAP_TYPE_UNSPEC,
  47         BPF_MAP_TYPE_HASH,
  48 };
  49
  50 /* union of anonymous structs used with TAP BPF commands */
  51 union bpf_attr {
  52         /* BPF_MAP_CREATE command */
  53         struct {
  54                 __u32   map_type;
  55                 __u32   key_size;
  56                 __u32   value_size;
  57                 __u32   max_entries;
  58                 __u32   map_flags;
  59                 __u32   inner_map_fd;
  60         };
  61
  62         /* BPF_MAP_UPDATE_ELEM, BPF_MAP_DELETE_ELEM commands */
  63         struct {
  64                 __u32           map_fd;
  65                 __aligned_u64   key;
  66                 union {
  67                         __aligned_u64 value;
  68                         __aligned_u64 next_key;
  69                 };
  70                 __u64           flags;
  71         };
  72
  73         /* BPF_PROG_LOAD command */
  74         struct {
  75                 __u32           prog_type;
  76                 __u32           insn_cnt;
  77                 __aligned_u64   insns;
  78                 __aligned_u64   license;
  79                 __u32           log_level;
  80                 __u32           log_size;
  81                 __aligned_u64   log_buf;
  82                 __u32           kern_version;
  83                 __u32           prog_flags;
  84         };
  85 } __attribute__((aligned(8)));
  86 #endif
  87
  88 #ifndef __NR_bpf
  89 # if defined(__i386__)
  90 #  define __NR_bpf 357
  91 # elif defined(__x86_64__)
  92 #  define __NR_bpf 321
  93 # elif defined(__aarch64__)
  94 #  define __NR_bpf 280
  95 # elif defined(__sparc__)
  96 #  define __NR_bpf 349
  97 # elif defined(__s390__)
  98 #  define __NR_bpf 351
  99 # else
 100 #  error __NR_bpf not defined
 101 # endif
 102 #endif
 103
 104 enum {
 105         BPF_MAP_ID_KEY,
 106         BPF_MAP_ID_SIMPLE,
 107 };
 108
 109 static int bpf_load(enum bpf_prog_type type, const struct bpf_insn *insns,
 110                 size_t insns_cnt, const char *license);
 111
 112 #endif /* __TAP_BPF_H__ */