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/* $OpenBSD: reply.c,v 1.5 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"
/* reply packet handling */
void
send_reply(struct nbr *nbr, struct rinfo_head *rinfo_list, int siareply)
{
struct eigrp *eigrp = nbr->ei->eigrp;
struct ibuf *buf;
uint16_t opcode;
struct rinfo_entry *re;
int size;
int route_len;
if (rinfo_list == NULL || TAILQ_EMPTY(rinfo_list))
return;
do {
if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
IP_MAXPACKET - sizeof(struct ip))) == NULL)
fatal("send_reply");
if (!siareply)
opcode = EIGRP_OPC_REPLY;
else
opcode = EIGRP_OPC_SIAREPLY;
/* EIGRP header */
if (gen_eigrp_hdr(buf, opcode, 0, eigrp->seq_num, eigrp->as))
goto fail;
switch (eigrp->af) {
case AF_INET:
size = sizeof(struct ip);
break;
case AF_INET6:
size = sizeof(struct ip6_hdr);
break;
default:
fatalx("send_reply: 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 > nbr->ei->iface->mtu) {
rtp_send_ucast(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));
/* reply packets are always unicast */
rtp_send_ucast(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_reply(struct nbr *nbr, struct rinfo_head *rinfo_list, int siareply)
{
int type;
struct rinfo_entry *re;
/*
* draft-savage-eigrp-02 - Section 4.3:
* "When a REPLY packet is received, there is no reason to process
* the packet before an acknowledgment is sent. Therefore, an Ack
* packet is sent immediately and then the packet is processed."
*/
rtp_send_ack(nbr);
if (!siareply)
type = IMSG_RECV_REPLY;
else
type = IMSG_RECV_SIAREPLY;
TAILQ_FOREACH(re, rinfo_list, entry)
eigrpe_imsg_compose_rde(type, nbr->peerid, 0, &re->rinfo,
sizeof(re->rinfo));
}
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