bgpd/bgp_attr_evpn.c

   1 /* Ethernet-VPN Attribute handling file
   2  * Copyright (C) 2016 6WIND
   3  *
   4  * This file is part of FRRouting.
   5  *
   6  * FRRouting 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  * FRRouting 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 #include <zebra.h>
  22
  23 #include "command.h"
  24 #include "filter.h"
  25 #include "prefix.h"
  26 #include "log.h"
  27 #include "memory.h"
  28 #include "stream.h"
  29
  30 #include "bgpd/bgpd.h"
  31 #include "bgpd/bgp_attr.h"
  32 #include "bgpd/bgp_route.h"
  33 #include "bgpd/bgp_attr_evpn.h"
  34 #include "bgpd/bgp_ecommunity.h"
  35 #include "bgpd/bgp_evpn.h"
  36
  37 void bgp_add_routermac_ecom(struct attr *attr, struct ethaddr *routermac)
  38 {
  39         struct ecommunity_val routermac_ecom;
  40
  41         if (attr->extra) {
  42                 memset(&routermac_ecom, 0, sizeof(struct ecommunity_val));
  43                 routermac_ecom.val[0] = ECOMMUNITY_ENCODE_EVPN;
  44                 routermac_ecom.val[1] = ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC;
  45                 memcpy(&routermac_ecom.val[2], routermac->octet, ETHER_ADDR_LEN);
  46                 if (!attr->extra->ecommunity)
  47                         attr->extra->ecommunity = ecommunity_new();
  48                 ecommunity_add_val(attr->extra->ecommunity, &routermac_ecom);
  49                 ecommunity_str (attr->extra->ecommunity);
  50         }
  51 }
  52
  53 /* converts to an esi
  54  * returns 1 on success, 0 otherwise
  55  * format accepted: AA:BB:CC:DD:EE:FF:GG:HH:II:JJ
  56  * if id is null, check only is done
  57  */
  58 int str2esi(const char *str, struct eth_segment_id *id)
  59 {
  60         unsigned int a[ESI_LEN];
  61         int i;
  62
  63         if (!str)
  64                 return 0;
  65         if (sscanf (str, "%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x",
  66                     a + 0, a + 1, a + 2, a + 3, a + 4, a + 5,
  67                     a + 6, a + 7, a + 8, a + 9) != ESI_LEN)
  68         {
  69                 /* error in incoming str length */
  70                 return 0;
  71         }
  72         /* valid mac address */
  73         if (!id)
  74                 return 1;
  75         for (i = 0; i < ESI_LEN; ++i)
  76                 id->val[i] = a[i] & 0xff;
  77         return 1;
  78 }
  79
  80 char *esi2str(struct eth_segment_id *id)
  81 {
  82         char *ptr;
  83         u_char *val;
  84
  85         if (!id)
  86                 return NULL;
  87
  88         val = id->val;
  89         ptr = (char *)XMALLOC(MTYPE_TMP, (ESI_LEN * 2 + ESI_LEN - 1 + 1) * sizeof(char));
  90
  91         snprintf(ptr, (ESI_LEN * 2 + ESI_LEN - 1 + 1),
  92                  "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
  93                  val[0], val[1], val[2], val[3], val[4],
  94                  val[5], val[6], val[7], val[8], val[9]);
  95
  96         return ptr;
  97 }
  98
  99 char *ecom_mac2str(char *ecom_mac)
 100 {
 101         char *en;
 102
 103         en = ecom_mac;
 104         en += 2;
 105         return prefix_mac2str((struct ethaddr *)en, NULL, 0);
 106 }
 107
 108 /* dst prefix must be AF_INET or AF_INET6 prefix, to forge EVPN prefix */
 109 extern int
 110 bgp_build_evpn_prefix(int evpn_type, uint32_t eth_tag, struct prefix *dst)
 111 {
 112         struct evpn_addr *p_evpn_p;
 113         struct prefix p2;
 114         struct prefix *src = &p2;
 115
 116         if (!dst || dst->family == 0)
 117                 return -1;
 118         /* store initial prefix in src */
 119         prefix_copy(src, dst);
 120         memset(dst, 0, sizeof(struct prefix));
 121         p_evpn_p = &(dst->u.prefix_evpn);
 122         dst->family = AF_ETHERNET;
 123         p_evpn_p->route_type = evpn_type;
 124         if (evpn_type == EVPN_IP_PREFIX) {
 125                 p_evpn_p->eth_tag = eth_tag;
 126                 p_evpn_p->ip_prefix_length = p2.prefixlen;
 127                 if (src->family == AF_INET) {
 128                         p_evpn_p->flags = IP_PREFIX_V4;
 129                         memcpy(&p_evpn_p->ip.v4_addr, &src->u.prefix4,
 130                                sizeof(struct in_addr));
 131                         dst->prefixlen = (u_char) PREFIX_LEN_ROUTE_TYPE_5_IPV4;
 132                 } else {
 133                         p_evpn_p->flags = IP_PREFIX_V6;
 134                         memcpy(&p_evpn_p->ip.v6_addr, &src->u.prefix6,
 135                                sizeof(struct in6_addr));
 136                         dst->prefixlen = (u_char) PREFIX_LEN_ROUTE_TYPE_5_IPV6;
 137                 }
 138         } else
 139                 return -1;
 140         return 0;
 141 }