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/* 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 "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"
void bgp_add_routermac_ecom(struct attr *attr, struct ethaddr *routermac)
{
struct ecommunity_val routermac_ecom;
memset(&routermac_ecom, 0, sizeof(struct ecommunity_val));
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 (!attr->ecommunity)
attr->ecommunity = ecommunity_new();
ecommunity_add_val(attr->ecommunity, &routermac_ecom);
ecommunity_str(attr->ecommunity);
}
/* 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
*/
int str2esi(const char *str, struct eth_segment_id *id)
{
unsigned int a[ESI_LEN];
int i;
if (!str)
return 0;
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_LEN) {
/* error in incoming str length */
return 0;
}
/* valid mac address */
if (!id)
return 1;
for (i = 0; i < ESI_LEN; ++i)
id->val[i] = a[i] & 0xff;
return 1;
}
char *esi2str(struct eth_segment_id *id)
{
char *ptr;
u_char *val;
if (!id)
return NULL;
val = id->val;
ptr = (char *)XMALLOC(MTYPE_TMP,
(ESI_LEN * 2 + ESI_LEN - 1 + 1) * sizeof(char));
snprintf(ptr, (ESI_LEN * 2 + ESI_LEN - 1 + 1),
"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x", val[0],
val[1], val[2], val[3], val[4], val[5], val[6], val[7], val[8],
val[9]);
return ptr;
}
char *ecom_mac2str(char *ecom_mac)
{
char *en;
en = ecom_mac;
en += 2;
return prefix_mac2str((struct ethaddr *)en, NULL, 0);
}
/*
* Fetch and return the sequence number from MAC Mobility extended
* community, if present, else 0.
*/
u_int32_t bgp_attr_mac_mobility_seqnum(struct attr *attr, u_char *sticky)
{
struct ecommunity *ecom;
int i;
u_char flags = 0;
ecom = attr->ecommunity;
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++) {
u_char *pnt;
u_char type, sub_type;
u_int32_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;
}
/* 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->eth_tag = eth_tag;
p_evpn_p->ip_prefix_length = p2.prefixlen;
if (src->family == AF_INET) {
SET_IPADDR_V4(&p_evpn_p->ip);
memcpy(&p_evpn_p->ip.ipaddr_v4, &src->u.prefix4,
sizeof(struct in_addr));
dst->prefixlen = (u_char)PREFIX_LEN_ROUTE_TYPE_5_IPV4;
} else {
SET_IPADDR_V6(&p_evpn_p->ip);
memcpy(&p_evpn_p->ip.ipaddr_v6, &src->u.prefix6,
sizeof(struct in6_addr));
dst->prefixlen = (u_char)PREFIX_LEN_ROUTE_TYPE_5_IPV6;
}
} else
return -1;
return 0;
}
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