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
  45 /* Low-order octet of the Extended Communities type field for EVPN types */
  46 #define ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY  0x00
  47 #define ECOMMUNITY_EVPN_SUBTYPE_ESI_LABEL    0x01
  48 #define ECOMMUNITY_EVPN_SUBTYPE_ES_IMPORT_RT 0x02
  49 #define ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC    0x03
  50 #define ECOMMUNITY_EVPN_SUBTYPE_DEF_GW       0x0d
  51
  52 #define ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY_FLAG_STICKY 0x01
  53
  54 /* Low-order octet of the Extended Communities type field for OPAQUE types */
  55 #define ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP     0x0c
  56
  57 /* Extended communities attribute string format.  */
  58 #define ECOMMUNITY_FORMAT_ROUTE_MAP            0
  59 #define ECOMMUNITY_FORMAT_COMMUNITY_LIST       1
  60 #define ECOMMUNITY_FORMAT_DISPLAY              2
  61
  62 /* Extended Communities value is eight octet long.  */
  63 #define ECOMMUNITY_SIZE                        8
  64
  65 /* Extended Communities type flag.  */
  66 #define ECOMMUNITY_FLAG_NON_TRANSITIVE      0x40
  67
  68 /* Extended Communities attribute.  */
  69 struct ecommunity {
  70         /* Reference counter.  */
  71         unsigned long refcnt;
  72
  73         /* Size of Extended Communities attribute.  */
  74         int size;
  75
  76         /* Extended Communities value.  */
  77         uint8_t *val;
  78
  79         /* Human readable format string.  */
  80         char *str;
  81 };
  82
  83 struct ecommunity_as {
  84         as_t as;
  85         uint32_t val;
  86 };
  87
  88 struct ecommunity_ip {
  89         struct in_addr ip;
  90         uint16_t val;
  91 };
  92
  93 /* Extended community value is eight octet.  */
  94 struct ecommunity_val {
  95         char val[ECOMMUNITY_SIZE];
  96 };
  97
  98 #define ecom_length(X)    ((X)->size * ECOMMUNITY_SIZE)
  99
 100 /*
 101  * Encode BGP Route Target AS:nn.
 102  */
 103 static inline void encode_route_target_as(as_t as, uint32_t val,
 104                                           struct ecommunity_val *eval)
 105 {
 106         eval->val[0] = ECOMMUNITY_ENCODE_AS;
 107         eval->val[1] = ECOMMUNITY_ROUTE_TARGET;
 108         eval->val[2] = (as >> 8) & 0xff;
 109         eval->val[3] = as & 0xff;
 110         eval->val[4] = (val >> 24) & 0xff;
 111         eval->val[5] = (val >> 16) & 0xff;
 112         eval->val[6] = (val >> 8) & 0xff;
 113         eval->val[7] = val & 0xff;
 114 }
 115
 116 /*
 117  * Encode BGP Route Target IP:nn.
 118  */
 119 static inline void encode_route_target_ip(struct in_addr ip, uint16_t val,
 120                                           struct ecommunity_val *eval)
 121 {
 122         eval->val[0] = ECOMMUNITY_ENCODE_IP;
 123         eval->val[1] = ECOMMUNITY_ROUTE_TARGET;
 124         memcpy(&eval->val[2], &ip, sizeof(struct in_addr));
 125         eval->val[6] = (val >> 8) & 0xff;
 126         eval->val[7] = val & 0xff;
 127 }
 128
 129 /*
 130  * Encode BGP Route Target AS4:nn.
 131  */
 132 static inline void encode_route_target_as4(as_t as, uint16_t val,
 133                                            struct ecommunity_val *eval)
 134 {
 135         eval->val[0] = ECOMMUNITY_ENCODE_AS4;
 136         eval->val[1] = ECOMMUNITY_ROUTE_TARGET;
 137         eval->val[2] = (as >> 24) & 0xff;
 138         eval->val[3] = (as >> 16) & 0xff;
 139         eval->val[4] = (as >> 8) & 0xff;
 140         eval->val[5] = as & 0xff;
 141         eval->val[6] = (val >> 8) & 0xff;
 142         eval->val[7] = val & 0xff;
 143 }
 144
 145 extern void ecommunity_init(void);
 146 extern void ecommunity_finish(void);
 147 extern void ecommunity_free(struct ecommunity **);
 148 extern struct ecommunity *ecommunity_parse(uint8_t *, unsigned short);
 149 extern struct ecommunity *ecommunity_dup(struct ecommunity *);
 150 extern struct ecommunity *ecommunity_merge(struct ecommunity *,
 151                                            struct ecommunity *);
 152 extern struct ecommunity *ecommunity_uniq_sort(struct ecommunity *);
 153 extern struct ecommunity *ecommunity_intern(struct ecommunity *);
 154 extern int ecommunity_cmp(const void *, const void *);
 155 extern void ecommunity_unintern(struct ecommunity **);
 156 extern unsigned int ecommunity_hash_make(void *);
 157 extern struct ecommunity *ecommunity_str2com(const char *, int, int);
 158 extern char *ecommunity_ecom2str(struct ecommunity *, int, int);
 159 extern void ecommunity_strfree(char **s);
 160 extern int ecommunity_match(const struct ecommunity *,
 161                             const struct ecommunity *);
 162 extern char *ecommunity_str(struct ecommunity *);
 163 extern struct ecommunity_val *ecommunity_lookup(const struct ecommunity *,
 164                                                 uint8_t, uint8_t);
 165 extern int ecommunity_add_val(struct ecommunity *ecom,
 166                               struct ecommunity_val *eval);
 167
 168 /* for vpn */
 169 extern struct ecommunity *ecommunity_new(void);
 170 extern int ecommunity_add_val(struct ecommunity *, struct ecommunity_val *);
 171 extern int ecommunity_strip(struct ecommunity *ecom, uint8_t type,
 172                             uint8_t subtype);
 173 extern struct ecommunity *ecommunity_new(void);
 174 extern int ecommunity_del_val(struct ecommunity *ecom,
 175                               struct ecommunity_val *eval);
 176 struct bgp_pbr_entry_action;
 177 extern int ecommunity_fill_pbr_action(struct ecommunity_val *ecom_eval,
 178                                struct bgp_pbr_entry_action *api);
 179
 180 #endif /* _QUAGGA_BGP_ECOMMUNITY_H */