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/* $OpenBSD: lsack.c,v 1.19 2010/05/26 13:56:08 nicm Exp $ */
/*
* Copyright (c) 2004, 2005 Esben Norby <norby@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 <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include "ospfd.h"
#include "ospf.h"
#include "log.h"
#include "ospfe.h"
void start_ls_ack_tx_timer_now(struct iface *);
/* link state acknowledgement packet handling */
int
send_ls_ack(struct iface *iface, struct in_addr addr, void *data, size_t len)
{
struct sockaddr_in dst;
struct ibuf *buf;
int ret;
/* XXX IBUF_READ_SIZE */
if ((buf = ibuf_dynamic(PKG_DEF_SIZE, READ_BUF_SIZE)) == NULL)
fatal("send_ls_ack");
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
dst.sin_addr.s_addr = addr.s_addr;
/* OSPF header */
if (gen_ospf_hdr(buf, iface, PACKET_TYPE_LS_ACK))
goto fail;
/* LS ack(s) */
if (ibuf_add(buf, data, len))
goto fail;
/* update authentication and calculate checksum */
if (auth_gen(buf, iface))
goto fail;
ret = send_packet(iface, buf, &dst);
ibuf_free(buf);
return (ret);
fail:
log_warn("send_ls_ack");
ibuf_free(buf);
return (-1);
}
void
recv_ls_ack(struct nbr *nbr, char *buf, u_int16_t len)
{
struct lsa_hdr lsa_hdr;
switch (nbr->state) {
case NBR_STA_DOWN:
case NBR_STA_ATTEMPT:
case NBR_STA_INIT:
case NBR_STA_2_WAY:
case NBR_STA_XSTRT:
case NBR_STA_SNAP:
log_debug("recv_ls_ack: packet ignored in state %s, "
"neighbor ID %s", nbr_state_name(nbr->state),
inet_ntoa(nbr->id));
break;
case NBR_STA_XCHNG:
case NBR_STA_LOAD:
case NBR_STA_FULL:
while (len >= sizeof(lsa_hdr)) {
memcpy(&lsa_hdr, buf, sizeof(lsa_hdr));
if (lsa_hdr_check(nbr, &lsa_hdr)) {
/* try both list in case of DROTHER */
if (nbr->iface->state & IF_STA_DROTHER)
(void)ls_retrans_list_del(
nbr->iface->self, &lsa_hdr);
(void)ls_retrans_list_del(nbr, &lsa_hdr);
}
buf += sizeof(lsa_hdr);
len -= sizeof(lsa_hdr);
}
if (len > 0) {
log_warnx("recv_ls_ack: bad packet size, "
"neighbor ID %s", inet_ntoa(nbr->id));
return;
}
break;
default:
fatalx("recv_ls_ack: unknown neighbor state");
}
}
int
lsa_hdr_check(struct nbr *nbr, struct lsa_hdr *lsa_hdr)
{
/* invalid age */
if ((ntohs(lsa_hdr->age) < 1) || (ntohs(lsa_hdr->age) > MAX_AGE)) {
log_debug("lsa_hdr_check: invalid age, neighbor ID %s",
inet_ntoa(nbr->id));
return (0);
}
/* invalid type */
switch (lsa_hdr->type) {
case LSA_TYPE_ROUTER:
case LSA_TYPE_NETWORK:
case LSA_TYPE_SUM_NETWORK:
case LSA_TYPE_SUM_ROUTER:
case LSA_TYPE_EXTERNAL:
break;
default:
log_debug("lsa_hdr_check: invalid LSA type %d, neighbor ID %s",
lsa_hdr->type, inet_ntoa(nbr->id));
return (0);
}
/* invalid sequence number */
if (ntohl(lsa_hdr->seq_num) == RESV_SEQ_NUM) {
log_debug("ls_hdr_check: invalid seq num, neighbor ID %s",
inet_ntoa(nbr->id));
return (0);
}
return (1);
}
/* link state ack list */
void
ls_ack_list_add(struct iface *iface, struct lsa_hdr *lsa)
{
struct lsa_entry *le;
if (lsa == NULL)
fatalx("ls_ack_list_add: no LSA header");
if ((le = calloc(1, sizeof(*le))) == NULL)
fatal("ls_ack_list_add");
if (ls_ack_list_empty(iface))
start_ls_ack_tx_timer(iface);
TAILQ_INSERT_TAIL(&iface->ls_ack_list, le, entry);
le->le_lsa = lsa;
iface->ls_ack_cnt++;
/* reschedule now if we have enough for a full packet */
if (iface->ls_ack_cnt >
((iface->mtu - PACKET_HDR) / sizeof(struct lsa_hdr))) {
start_ls_ack_tx_timer_now(iface);
}
}
void
ls_ack_list_free(struct iface *iface, struct lsa_entry *le)
{
TAILQ_REMOVE(&iface->ls_ack_list, le, entry);
free(le->le_lsa);
free(le);
iface->ls_ack_cnt--;
}
void
ls_ack_list_clr(struct iface *iface)
{
struct lsa_entry *le;
while ((le = TAILQ_FIRST(&iface->ls_ack_list)) != NULL) {
TAILQ_REMOVE(&iface->ls_ack_list, le, entry);
free(le->le_lsa);
free(le);
}
iface->ls_ack_cnt = 0;
}
int
ls_ack_list_empty(struct iface *iface)
{
return (TAILQ_EMPTY(&iface->ls_ack_list));
}
/* timers */
/* ARGSUSED */
void
ls_ack_tx_timer(int fd, short event, void *arg)
{
struct in_addr addr;
struct iface *iface = arg;
struct lsa_hdr *lsa_hdr;
struct lsa_entry *le, *nle;
struct nbr *nbr;
char *buf;
char *ptr;
int cnt = 0;
if ((buf = calloc(1, READ_BUF_SIZE)) == NULL)
fatal("ls_ack_tx_timer");
while (!ls_ack_list_empty(iface)) {
ptr = buf;
cnt = 0;
for (le = TAILQ_FIRST(&iface->ls_ack_list); le != NULL &&
(ptr - buf < iface->mtu - PACKET_HDR); le = nle) {
nle = TAILQ_NEXT(le, entry);
memcpy(ptr, le->le_lsa, sizeof(struct lsa_hdr));
ptr += sizeof(*lsa_hdr);
ls_ack_list_free(iface, le);
cnt++;
}
/* send LS ack(s) but first set correct destination */
switch (iface->type) {
case IF_TYPE_POINTOPOINT:
inet_aton(AllSPFRouters, &addr);
send_ls_ack(iface, addr, buf, ptr - buf);
break;
case IF_TYPE_BROADCAST:
if (iface->state & IF_STA_DRORBDR)
inet_aton(AllSPFRouters, &addr);
else
inet_aton(AllDRouters, &addr);
send_ls_ack(iface, addr, buf, ptr - buf);
break;
case IF_TYPE_NBMA:
case IF_TYPE_POINTOMULTIPOINT:
case IF_TYPE_VIRTUALLINK:
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr == iface->self)
continue;
if (!(nbr->state & NBR_STA_FLOOD))
continue;
send_ls_ack(iface, nbr->addr, buf, ptr - buf);
}
break;
default:
fatalx("lsa_ack_tx_timer: unknown interface type");
}
}
free(buf);
}
void
start_ls_ack_tx_timer(struct iface *iface)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = iface->rxmt_interval / 2;
if (evtimer_add(&iface->lsack_tx_timer, &tv) == -1)
fatal("start_ls_ack_tx_timer");
}
void
start_ls_ack_tx_timer_now(struct iface *iface)
{
struct timeval tv;
timerclear(&tv);
if (evtimer_add(&iface->lsack_tx_timer, &tv) == -1)
fatal("start_ls_ack_tx_timer_now");
}
void
stop_ls_ack_tx_timer(struct iface *iface)
{
if (evtimer_del(&iface->lsack_tx_timer) == -1)
fatal("stop_ls_ack_tx_timer");
}
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