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Diffstat (limited to '')
-rw-r--r-- | bgpd/bgp_attr_evpn.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/bgpd/bgp_attr_evpn.c b/bgpd/bgp_attr_evpn.c new file mode 100644 index 0000000..d379f40 --- /dev/null +++ b/bgpd/bgp_attr_evpn.c @@ -0,0 +1,317 @@ +/* Ethernet-VPN Attribute handling file + * Copyright (C) 2016 6WIND + * + * This file is part of FRRouting. + * + * FRRouting is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2, or (at your option) any + * later version. + * + * FRRouting is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <zebra.h> + +#include "command.h" +#include "filter.h" +#include "prefix.h" +#include "log.h" +#include "memory.h" +#include "stream.h" +#include "vxlan.h" + +#include "bgpd/bgpd.h" +#include "bgpd/bgp_attr.h" +#include "bgpd/bgp_route.h" +#include "bgpd/bgp_attr_evpn.h" +#include "bgpd/bgp_ecommunity.h" +#include "bgpd/bgp_evpn.h" +#include "bgpd/bgp_evpn_private.h" + +bool bgp_route_evpn_same(const struct bgp_route_evpn *e1, + const struct bgp_route_evpn *e2) +{ + return (e1->type == e2->type && + !memcmp(&(e1->eth_s_id), &(e2->eth_s_id), sizeof(esi_t)) && + !ipaddr_cmp(&(e1->gw_ip), &(e2->gw_ip))); +} + +void bgp_add_routermac_ecom(struct attr *attr, struct ethaddr *routermac) +{ + struct ecommunity_val routermac_ecom; + struct ecommunity *ecomm = bgp_attr_get_ecommunity(attr); + + memset(&routermac_ecom, 0, sizeof(routermac_ecom)); + routermac_ecom.val[0] = ECOMMUNITY_ENCODE_EVPN; + routermac_ecom.val[1] = ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC; + memcpy(&routermac_ecom.val[2], routermac->octet, ETH_ALEN); + if (!ecomm) { + bgp_attr_set_ecommunity(attr, ecommunity_new()); + ecomm = bgp_attr_get_ecommunity(attr); + } + ecommunity_add_val(ecomm, &routermac_ecom, false, false); + ecommunity_str(ecomm); +} + +/* converts to an esi + * returns 1 on success, 0 otherwise + * format accepted: AA:BB:CC:DD:EE:FF:GG:HH:II:JJ + * if id is null, check only is done + */ +bool str2esi(const char *str, esi_t *id) +{ + unsigned int a[ESI_BYTES]; + int i; + + if (!str) + return false; + if (sscanf(str, "%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, + a + 2, a + 3, a + 4, a + 5, a + 6, a + 7, a + 8, a + 9) + != ESI_BYTES) { + /* error in incoming str length */ + return false; + } + /* valid mac address */ + if (!id) + return true; + for (i = 0; i < ESI_BYTES; ++i) + id->val[i] = a[i] & 0xff; + return true; +} + +char *ecom_mac2str(char *ecom_mac) +{ + char *en; + + en = ecom_mac; + en += 2; + + return prefix_mac2str((struct ethaddr *)en, NULL, 0); +} + +/* Fetch router-mac from extended community */ +bool bgp_attr_rmac(struct attr *attr, struct ethaddr *rmac) +{ + uint32_t i = 0; + struct ecommunity *ecom; + + ecom = bgp_attr_get_ecommunity(attr); + if (!ecom || !ecom->size) + return false; + + /* If there is a router mac extended community, set RMAC in attr */ + for (i = 0; i < ecom->size; i++) { + uint8_t *pnt = NULL; + uint8_t type = 0; + uint8_t sub_type = 0; + + pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); + type = *pnt++; + sub_type = *pnt++; + + if (!(type == ECOMMUNITY_ENCODE_EVPN + && sub_type == ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC)) + continue; + + memcpy(rmac, pnt, ETH_ALEN); + return true; + } + return false; +} + +/* + * return true if attr contains default gw extended community + */ +uint8_t bgp_attr_default_gw(struct attr *attr) +{ + struct ecommunity *ecom; + uint32_t i; + + ecom = bgp_attr_get_ecommunity(attr); + if (!ecom || !ecom->size) + return 0; + + /* If there is a default gw extendd community return true otherwise + * return 0 */ + for (i = 0; i < ecom->size; i++) { + uint8_t *pnt; + uint8_t type, sub_type; + + pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); + type = *pnt++; + sub_type = *pnt++; + + if ((type == ECOMMUNITY_ENCODE_OPAQUE + && sub_type == ECOMMUNITY_EVPN_SUBTYPE_DEF_GW)) + return 1; + } + + return 0; +} + +/* + * Fetch and return the DF preference and algorithm from + * DF election extended community, if present, else 0. + */ +uint16_t bgp_attr_df_pref_from_ec(struct attr *attr, uint8_t *alg) +{ + struct ecommunity *ecom; + uint32_t i; + uint16_t df_pref = 0; + + *alg = EVPN_MH_DF_ALG_SERVICE_CARVING; + ecom = bgp_attr_get_ecommunity(attr); + if (!ecom || !ecom->size) + return 0; + + for (i = 0; i < ecom->size; i++) { + uint8_t *pnt; + uint8_t type, sub_type; + + pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); + type = *pnt++; + sub_type = *pnt++; + if (!(type == ECOMMUNITY_ENCODE_EVPN + && sub_type == ECOMMUNITY_EVPN_SUBTYPE_DF_ELECTION)) + continue; + + *alg = (*pnt++) & ECOMMUNITY_EVPN_SUBTYPE_DF_ALG_BITS; + + pnt += 3; + pnt = ptr_get_be16(pnt, &df_pref); + (void)pnt; /* consume value */ + break; + } + + return df_pref; +} + +/* + * Fetch and return the sequence number from MAC Mobility extended + * community, if present, else 0. + */ +uint32_t bgp_attr_mac_mobility_seqnum(struct attr *attr, uint8_t *sticky) +{ + struct ecommunity *ecom; + uint32_t i; + uint8_t flags = 0; + + ecom = bgp_attr_get_ecommunity(attr); + if (!ecom || !ecom->size) + return 0; + + /* If there is a MAC Mobility extended community, return its + * sequence number. + * TODO: RFC is silent on handling of multiple MAC mobility extended + * communities for the same route. We will bail out upon the first + * one. + */ + for (i = 0; i < ecom->size; i++) { + const uint8_t *pnt; + uint8_t type, sub_type; + uint32_t seq_num; + + pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); + type = *pnt++; + sub_type = *pnt++; + if (!(type == ECOMMUNITY_ENCODE_EVPN + && sub_type == ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY)) + continue; + flags = *pnt++; + + if (flags & ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY_FLAG_STICKY) + *sticky = 1; + else + *sticky = 0; + + pnt++; + pnt = ptr_get_be32(pnt, &seq_num); + (void)pnt; /* consume value */ + return seq_num; + } + + return 0; +} + +/* + * return true if attr contains router flag extended community + */ +void bgp_attr_evpn_na_flag(struct attr *attr, + uint8_t *router_flag, bool *proxy) +{ + struct ecommunity *ecom; + uint32_t i; + uint8_t val; + + ecom = bgp_attr_get_ecommunity(attr); + if (!ecom || !ecom->size) + return; + + /* If there is a evpn na extendd community set router_flag */ + for (i = 0; i < ecom->size; i++) { + uint8_t *pnt; + uint8_t type, sub_type; + + pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); + type = *pnt++; + sub_type = *pnt++; + + if (type == ECOMMUNITY_ENCODE_EVPN && + sub_type == ECOMMUNITY_EVPN_SUBTYPE_ND) { + val = *pnt++; + + if (val & ECOMMUNITY_EVPN_SUBTYPE_ND_ROUTER_FLAG) + *router_flag = 1; + + if (val & ECOMMUNITY_EVPN_SUBTYPE_PROXY_FLAG) + *proxy = true; + + break; + } + } +} + +/* dst prefix must be AF_INET or AF_INET6 prefix, to forge EVPN prefix */ +extern int bgp_build_evpn_prefix(int evpn_type, uint32_t eth_tag, + struct prefix *dst) +{ + struct evpn_addr *p_evpn_p; + struct prefix p2; + struct prefix *src = &p2; + + if (!dst || dst->family == 0) + return -1; + /* store initial prefix in src */ + prefix_copy(src, dst); + memset(dst, 0, sizeof(struct prefix)); + p_evpn_p = &(dst->u.prefix_evpn); + dst->family = AF_EVPN; + p_evpn_p->route_type = evpn_type; + if (evpn_type == BGP_EVPN_IP_PREFIX_ROUTE) { + p_evpn_p->prefix_addr.eth_tag = eth_tag; + p_evpn_p->prefix_addr.ip_prefix_length = p2.prefixlen; + if (src->family == AF_INET) { + SET_IPADDR_V4(&p_evpn_p->prefix_addr.ip); + memcpy(&p_evpn_p->prefix_addr.ip.ipaddr_v4, + &src->u.prefix4, + sizeof(struct in_addr)); + dst->prefixlen = (uint16_t)PREFIX_LEN_ROUTE_TYPE_5_IPV4; + } else { + SET_IPADDR_V6(&p_evpn_p->prefix_addr.ip); + memcpy(&p_evpn_p->prefix_addr.ip.ipaddr_v6, + &src->u.prefix6, + sizeof(struct in6_addr)); + dst->prefixlen = (uint16_t)PREFIX_LEN_ROUTE_TYPE_5_IPV6; + } + } else + return -1; + return 0; +} |