lib/srv6.h

   1 /*
   2  * SRv6 definitions
   3  * Copyright (C) 2020  Hiroki Shirokura, LINE Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the Free
   7  * Software Foundation; either version 2 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; see the file COPYING; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #ifndef _FRR_SRV6_H
  21 #define _FRR_SRV6_H
  22
  23 #include <zebra.h>
  24 #include <arpa/inet.h>
  25 #include <netinet/in.h>
  26
  27 #define SRV6_MAX_SIDS 16
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 #define sid2str(sid, str, size) \
  34         inet_ntop(AF_INET6, sid, str, size)
  35
  36 enum seg6_mode_t {
  37         INLINE,
  38         ENCAP,
  39         L2ENCAP,
  40 };
  41
  42 enum seg6local_action_t {
  43         ZEBRA_SEG6_LOCAL_ACTION_UNSPEC       = 0,
  44         ZEBRA_SEG6_LOCAL_ACTION_END          = 1,
  45         ZEBRA_SEG6_LOCAL_ACTION_END_X        = 2,
  46         ZEBRA_SEG6_LOCAL_ACTION_END_T        = 3,
  47         ZEBRA_SEG6_LOCAL_ACTION_END_DX2      = 4,
  48         ZEBRA_SEG6_LOCAL_ACTION_END_DX6      = 5,
  49         ZEBRA_SEG6_LOCAL_ACTION_END_DX4      = 6,
  50         ZEBRA_SEG6_LOCAL_ACTION_END_DT6      = 7,
  51         ZEBRA_SEG6_LOCAL_ACTION_END_DT4      = 8,
  52         ZEBRA_SEG6_LOCAL_ACTION_END_B6       = 9,
  53         ZEBRA_SEG6_LOCAL_ACTION_END_B6_ENCAP = 10,
  54         ZEBRA_SEG6_LOCAL_ACTION_END_BM       = 11,
  55         ZEBRA_SEG6_LOCAL_ACTION_END_S        = 12,
  56         ZEBRA_SEG6_LOCAL_ACTION_END_AS       = 13,
  57         ZEBRA_SEG6_LOCAL_ACTION_END_AM       = 14,
  58         ZEBRA_SEG6_LOCAL_ACTION_END_BPF      = 15,
  59 };
  60
  61 struct seg6_segs {
  62         size_t num_segs;
  63         struct in6_addr segs[256];
  64 };
  65
  66 struct seg6local_context {
  67         struct in_addr nh4;
  68         struct in6_addr nh6;
  69         uint32_t table;
  70 };
  71
  72 static inline const char *seg6_mode2str(enum seg6_mode_t mode)
  73 {
  74         switch (mode) {
  75         case INLINE:
  76                 return "INLINE";
  77         case ENCAP:
  78                 return "ENCAP";
  79         case L2ENCAP:
  80                 return "L2ENCAP";
  81         default:
  82                 return "unknown";
  83         }
  84 }
  85
  86 static inline bool sid_same(
  87                 const struct in6_addr *a,
  88                 const struct in6_addr *b)
  89 {
  90         if (!a && !b)
  91                 return true;
  92         else if (!(a && b))
  93                 return false;
  94         else
  95                 return memcmp(a, b, sizeof(struct in6_addr)) == 0;
  96 }
  97
  98 static inline bool sid_diff(
  99                 const struct in6_addr *a,
 100                 const struct in6_addr *b)
 101 {
 102         return !sid_same(a, b);
 103 }
 104
 105 static inline bool sid_zero(
 106                 const struct in6_addr *a)
 107 {
 108         struct in6_addr zero = {};
 109
 110         return sid_same(a, &zero);
 111 }
 112
 113 static inline void *sid_copy(struct in6_addr *dst,
 114                 const struct in6_addr *src)
 115 {
 116         return memcpy(dst, src, sizeof(struct in6_addr));
 117 }
 118
 119 const char *
 120 seg6local_action2str(uint32_t action);
 121
 122 const char *
 123 seg6local_context2str(char *str, size_t size,
 124                 struct seg6local_context *ctx, uint32_t action);
 125
 126 int snprintf_seg6_segs(char *str,
 127                 size_t size, const struct seg6_segs *segs);
 128
 129 #ifdef __cplusplus
 130 }
 131 #endif
 132
 133 #endif