bgpd/bgp_ecommunity.h

   1 /* BGP Extended Communities Attribute.
   2  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _QUAGGA_BGP_ECOMMUNITY_H
  22 #define _QUAGGA_BGP_ECOMMUNITY_H
  23
  24 /* High-order octet of the Extended Communities type field.  */
  25 #define ECOMMUNITY_ENCODE_AS                0x00
  26 #define ECOMMUNITY_ENCODE_IP                0x01
  27 #define ECOMMUNITY_ENCODE_AS4               0x02
  28 #define ECOMMUNITY_ENCODE_OPAQUE            0x03
  29 #define ECOMMUNITY_ENCODE_EVPN              0x06
  30 #define ECOMMUNITY_ENCODE_TRANS_EXP         0x80 /* Flow Spec */
  31 #define ECOMMUNITY_ENCODE_REDIRECT_IP_NH    0x08 /* Flow Spec */
  32 /* RFC7674 */
  33 #define ECOMMUNITY_EXTENDED_COMMUNITY_PART_2 0x81
  34 #define ECOMMUNITY_EXTENDED_COMMUNITY_PART_3 0x82
  35
  36 /* Low-order octet of the Extended Communities type field.  */
  37 #define ECOMMUNITY_ROUTE_TARGET             0x02
  38 #define ECOMMUNITY_SITE_ORIGIN              0x03
  39 #define ECOMMUNITY_TRAFFIC_RATE             0x06 /* Flow Spec */
  40 #define ECOMMUNITY_TRAFFIC_ACTION           0x07
  41 #define ECOMMUNITY_REDIRECT_VRF             0x08
  42 #define ECOMMUNITY_TRAFFIC_MARKING          0x09
  43 #define ECOMMUNITY_REDIRECT_IP_NH           0x00
  44 /* from IANA: bgp-extended-communities/bgp-extended-communities.xhtml
  45  * 0x0c Flow-spec Redirect to IPv4 - draft-ietf-idr-flowspec-redirect
  46  */
  47 #define ECOMMUNITY_FLOWSPEC_REDIRECT_IPV4   0x0c
  48
  49 /* Low-order octet of the Extended Communities type field for EVPN types */
  50 #define ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY  0x00
  51 #define ECOMMUNITY_EVPN_SUBTYPE_ESI_LABEL    0x01
  52 #define ECOMMUNITY_EVPN_SUBTYPE_ES_IMPORT_RT 0x02
  53 #define ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC    0x03
  54 #define ECOMMUNITY_EVPN_SUBTYPE_DEF_GW       0x0d
  55 #define ECOMMUNITY_EVPN_SUBTYPE_ND           0x08
  56
  57 #define ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY_FLAG_STICKY 0x01
  58 #define ECOMMUNITY_EVPN_SUBTYPE_ND_ROUTER_FLAG          0x01
  59 #define ECOMMUNITY_EVPN_SUBTYPE_ND_OVERRIDE_FLAG        0x02
  60
  61 /* Low-order octet of the Extended Communities type field for OPAQUE types */
  62 #define ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP     0x0c
  63
  64 /* Extended communities attribute string format.  */
  65 #define ECOMMUNITY_FORMAT_ROUTE_MAP            0
  66 #define ECOMMUNITY_FORMAT_COMMUNITY_LIST       1
  67 #define ECOMMUNITY_FORMAT_DISPLAY              2
  68
  69 /* Extended Communities value is eight octet long.  */
  70 #define ECOMMUNITY_SIZE                        8
  71
  72 /* Extended Communities type flag.  */
  73 #define ECOMMUNITY_FLAG_NON_TRANSITIVE      0x40
  74
  75 /* Extended Communities attribute.  */
  76 struct ecommunity {
  77         /* Reference counter.  */
  78         unsigned long refcnt;
  79
  80         /* Size of Extended Communities attribute.  */
  81         int size;
  82
  83         /* Extended Communities value.  */
  84         uint8_t *val;
  85
  86         /* Human readable format string.  */
  87         char *str;
  88 };
  89
  90 struct ecommunity_as {
  91         as_t as;
  92         uint32_t val;
  93 };
  94
  95 struct ecommunity_ip {
  96         struct in_addr ip;
  97         uint16_t val;
  98 };
  99
 100 /* Extended community value is eight octet.  */
 101 struct ecommunity_val {
 102         char val[ECOMMUNITY_SIZE];
 103 };
 104
 105 #define ecom_length(X)    ((X)->size * ECOMMUNITY_SIZE)
 106
 107 /*
 108  * Encode BGP Route Target AS:nn.
 109  */
 110 static inline void encode_route_target_as(as_t as, uint32_t val,
 111                                           struct ecommunity_val *eval)
 112 {
 113         eval->val[0] = ECOMMUNITY_ENCODE_AS;
 114         eval->val[1] = ECOMMUNITY_ROUTE_TARGET;
 115         eval->val[2] = (as >> 8) & 0xff;
 116         eval->val[3] = as & 0xff;
 117         eval->val[4] = (val >> 24) & 0xff;
 118         eval->val[5] = (val >> 16) & 0xff;
 119         eval->val[6] = (val >> 8) & 0xff;
 120         eval->val[7] = val & 0xff;
 121 }
 122
 123 /*
 124  * Encode BGP Route Target IP:nn.
 125  */
 126 static inline void encode_route_target_ip(struct in_addr ip, uint16_t val,
 127                                           struct ecommunity_val *eval)
 128 {
 129         eval->val[0] = ECOMMUNITY_ENCODE_IP;
 130         eval->val[1] = ECOMMUNITY_ROUTE_TARGET;
 131         memcpy(&eval->val[2], &ip, sizeof(struct in_addr));
 132         eval->val[6] = (val >> 8) & 0xff;
 133         eval->val[7] = val & 0xff;
 134 }
 135
 136 /*
 137  * Encode BGP Route Target AS4:nn.
 138  */
 139 static inline void encode_route_target_as4(as_t as, uint16_t val,
 140                                            struct ecommunity_val *eval)
 141 {
 142         eval->val[0] = ECOMMUNITY_ENCODE_AS4;
 143         eval->val[1] = ECOMMUNITY_ROUTE_TARGET;
 144         eval->val[2] = (as >> 24) & 0xff;
 145         eval->val[3] = (as >> 16) & 0xff;
 146         eval->val[4] = (as >> 8) & 0xff;
 147         eval->val[5] = as & 0xff;
 148         eval->val[6] = (val >> 8) & 0xff;
 149         eval->val[7] = val & 0xff;
 150 }
 151
 152 extern void ecommunity_init(void);
 153 extern void ecommunity_finish(void);
 154 extern void ecommunity_free(struct ecommunity **);
 155 extern struct ecommunity *ecommunity_parse(uint8_t *, unsigned short);
 156 extern struct ecommunity *ecommunity_dup(struct ecommunity *);
 157 extern struct ecommunity *ecommunity_merge(struct ecommunity *,
 158                                            struct ecommunity *);
 159 extern struct ecommunity *ecommunity_uniq_sort(struct ecommunity *);
 160 extern struct ecommunity *ecommunity_intern(struct ecommunity *);
 161 extern bool ecommunity_cmp(const void *arg1, const void *arg2);
 162 extern void ecommunity_unintern(struct ecommunity **);
 163 extern unsigned int ecommunity_hash_make(void *);
 164 extern struct ecommunity *ecommunity_str2com(const char *, int, int);
 165 extern char *ecommunity_ecom2str(struct ecommunity *, int, int);
 166 extern void ecommunity_strfree(char **s);
 167 extern int ecommunity_match(const struct ecommunity *,
 168                             const struct ecommunity *);
 169 extern char *ecommunity_str(struct ecommunity *);
 170 extern struct ecommunity_val *ecommunity_lookup(const struct ecommunity *,
 171                                                 uint8_t, uint8_t);
 172 extern int ecommunity_add_val(struct ecommunity *ecom,
 173                               struct ecommunity_val *eval);
 174
 175 /* for vpn */
 176 extern struct ecommunity *ecommunity_new(void);
 177 extern int ecommunity_add_val(struct ecommunity *, struct ecommunity_val *);
 178 extern int ecommunity_strip(struct ecommunity *ecom, uint8_t type,
 179                             uint8_t subtype);
 180 extern struct ecommunity *ecommunity_new(void);
 181 extern int ecommunity_del_val(struct ecommunity *ecom,
 182                               struct ecommunity_val *eval);
 183 struct bgp_pbr_entry_action;
 184 extern int ecommunity_fill_pbr_action(struct ecommunity_val *ecom_eval,
 185                                struct bgp_pbr_entry_action *api);
 186
 187 #endif /* _QUAGGA_BGP_ECOMMUNITY_H */