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/* $OpenBSD: update.c,v 1.6 2016/09/02 16:46:29 renato Exp $ */
/*
* Copyright (c) 2015 Renato Westphal <renato@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <stdlib.h>
#include "eigrpd.h"
#include "eigrpe.h"
#include "log.h"
/* update packet handling */
void
send_update(struct eigrp_iface *ei, struct nbr *nbr, uint32_t flags,
struct rinfo_head *rinfo_list)
{
struct eigrp *eigrp = ei->eigrp;
struct ibuf *buf;
struct rinfo_entry *re;
int size;
int route_len;
do {
if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
IP_MAXPACKET - sizeof(struct ip))) == NULL)
fatal("send_update");
/* EIGRP header */
if (gen_eigrp_hdr(buf, EIGRP_OPC_UPDATE, flags,
eigrp->seq_num, eigrp->as))
goto fail;
if (rinfo_list == NULL)
break;
switch (eigrp->af) {
case AF_INET:
size = sizeof(struct ip);
break;
case AF_INET6:
size = sizeof(struct ip6_hdr);
break;
default:
fatalx("send_update: unknown af");
}
size += sizeof(struct eigrp_hdr);
while ((re = TAILQ_FIRST(rinfo_list)) != NULL) {
route_len = len_route_tlv(&re->rinfo);
/* don't exceed the MTU to avoid IP fragmentation */
if (size + route_len > ei->iface->mtu) {
rtp_send(ei, nbr, buf);
break;
}
size += route_len;
if (gen_route_tlv(buf, &re->rinfo))
goto fail;
TAILQ_REMOVE(rinfo_list, re, entry);
free(re);
}
} while (!TAILQ_EMPTY(rinfo_list));
rtp_send(ei, nbr, buf);
return;
fail:
log_warnx("%s: failed to send message", __func__);
if (rinfo_list)
message_list_clr(rinfo_list);
ibuf_free(buf);
return;
}
void
recv_update(struct nbr *nbr, struct rinfo_head *rinfo_list, uint32_t flags)
{
struct rinfo_entry *re;
rtp_ack_start_timer(nbr);
if (flags & EIGRP_HDR_FLAG_INIT) {
log_debug("%s: INIT flag is set", __func__);
if (nbr->flags & F_EIGRP_NBR_PENDING)
nbr_init(nbr);
/*
* The INIT flag instructs us to advertise all of our routes,
* even if the neighbor is not pending.
*/
eigrpe_imsg_compose_rde(IMSG_RECV_UPDATE_INIT, nbr->peerid,
0, NULL, 0);
return;
}
TAILQ_FOREACH(re, rinfo_list, entry)
eigrpe_imsg_compose_rde(IMSG_RECV_UPDATE, nbr->peerid,
0, &re->rinfo, sizeof(re->rinfo));
}
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