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/* $OpenBSD: lsreq.c,v 1.24 2023/03/08 04:43:14 guenther 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 <arpa/inet.h>
#include <stdlib.h>
#include "ospfd.h"
#include "ospf.h"
#include "log.h"
#include "ospfe.h"
/* link state request packet handling */
int
send_ls_req(struct nbr *nbr)
{
struct sockaddr_in dst;
struct ls_req_hdr ls_req_hdr;
struct lsa_entry *le, *nle;
struct ibuf *buf;
if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip))) == NULL)
fatal("send_ls_req");
/* set destination */
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
switch (nbr->iface->type) {
case IF_TYPE_POINTOPOINT:
inet_aton(AllSPFRouters, &dst.sin_addr);
break;
case IF_TYPE_BROADCAST:
case IF_TYPE_NBMA:
case IF_TYPE_POINTOMULTIPOINT:
case IF_TYPE_VIRTUALLINK:
dst.sin_addr.s_addr = nbr->addr.s_addr;
break;
default:
fatalx("send_ls_req: unknown interface type");
}
/* OSPF header */
if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_LS_REQUEST))
goto fail;
/* LSA header(s), keep space for a possible md5 sum */
for (le = TAILQ_FIRST(&nbr->ls_req_list); le != NULL &&
ibuf_left(buf) >= sizeof(struct ls_req_hdr) + MD5_DIGEST_LENGTH;
le = nle) {
nbr->ls_req = nle = TAILQ_NEXT(le, entry);
ls_req_hdr.type = htonl(le->le_lsa->type);
ls_req_hdr.ls_id = le->le_lsa->ls_id;
ls_req_hdr.adv_rtr = le->le_lsa->adv_rtr;
if (ibuf_add(buf, &ls_req_hdr, sizeof(ls_req_hdr)))
goto fail;
}
/* update authentication and calculate checksum */
if (auth_gen(buf, nbr->iface))
goto fail;
if (send_packet(nbr->iface, buf, &dst) == -1)
goto fail;
ibuf_free(buf);
return (0);
fail:
log_warn("%s", __func__);
ibuf_free(buf);
return (-1);
}
void
recv_ls_req(struct nbr *nbr, char *buf, u_int16_t len)
{
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_req: packet ignored in state %s, "
"neighbor ID %s (%s)", nbr_state_name(nbr->state),
inet_ntoa(nbr->id), nbr->iface->name);
break;
case NBR_STA_XCHNG:
case NBR_STA_LOAD:
case NBR_STA_FULL:
ospfe_imsg_compose_rde(IMSG_LS_REQ, nbr->peerid, 0, buf, len);
break;
default:
fatalx("recv_ls_req: unknown neighbor state");
}
}
/* link state request list */
void
ls_req_list_add(struct nbr *nbr, struct lsa_hdr *lsa)
{
struct lsa_entry *le;
if (lsa == NULL)
fatalx("ls_req_list_add: no LSA header");
if ((le = calloc(1, sizeof(*le))) == NULL)
fatal("ls_req_list_add");
TAILQ_INSERT_TAIL(&nbr->ls_req_list, le, entry);
le->le_lsa = lsa;
nbr->ls_req_cnt++;
}
struct lsa_entry *
ls_req_list_get(struct nbr *nbr, struct lsa_hdr *lsa_hdr)
{
struct lsa_entry *le;
TAILQ_FOREACH(le, &nbr->ls_req_list, entry) {
if ((lsa_hdr->type == le->le_lsa->type) &&
(lsa_hdr->ls_id == le->le_lsa->ls_id) &&
(lsa_hdr->adv_rtr == le->le_lsa->adv_rtr))
return (le);
}
return (NULL);
}
void
ls_req_list_free(struct nbr *nbr, struct lsa_entry *le)
{
if (nbr->ls_req == le) {
nbr->ls_req = TAILQ_NEXT(le, entry);
}
TAILQ_REMOVE(&nbr->ls_req_list, le, entry);
free(le->le_lsa);
free(le);
nbr->ls_req_cnt--;
/* received all requested LSA(s), send a new LS req */
if (nbr->ls_req != NULL &&
nbr->ls_req == TAILQ_FIRST(&nbr->ls_req_list)) {
start_ls_req_tx_timer(nbr);
}
/* we might not have received all DDs and are still in XCHNG */
if (ls_req_list_empty(nbr) && nbr->dd_pending == 0 &&
nbr->state != NBR_STA_XCHNG)
nbr_fsm(nbr, NBR_EVT_LOAD_DONE);
}
void
ls_req_list_clr(struct nbr *nbr)
{
struct lsa_entry *le;
while ((le = TAILQ_FIRST(&nbr->ls_req_list)) != NULL) {
TAILQ_REMOVE(&nbr->ls_req_list, le, entry);
free(le->le_lsa);
free(le);
}
nbr->ls_req_cnt = 0;
nbr->ls_req = NULL;
}
int
ls_req_list_empty(struct nbr *nbr)
{
return (TAILQ_EMPTY(&nbr->ls_req_list));
}
/* timers */
void
ls_req_tx_timer(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
struct timeval tv;
switch (nbr->state) {
case NBR_STA_DOWN:
case NBR_STA_ATTEMPT:
case NBR_STA_INIT:
case NBR_STA_2_WAY:
case NBR_STA_SNAP:
case NBR_STA_XSTRT:
case NBR_STA_XCHNG:
return;
case NBR_STA_LOAD:
send_ls_req(nbr);
break;
case NBR_STA_FULL:
return;
default:
log_debug("ls_req_tx_timer: unknown neighbor state, "
"neighbor ID %s (%s)", inet_ntoa(nbr->id),
nbr->iface->name);
break;
}
/* reschedule lsreq_tx_timer */
if (nbr->state == NBR_STA_LOAD) {
timerclear(&tv);
tv.tv_sec = nbr->iface->rxmt_interval;
if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1)
fatal("ls_req_tx_timer");
}
}
void
start_ls_req_tx_timer(struct nbr *nbr)
{
struct timeval tv;
if (nbr == nbr->iface->self)
return;
timerclear(&tv);
if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1)
fatal("start_ls_req_tx_timer");
}
void
stop_ls_req_tx_timer(struct nbr *nbr)
{
if (nbr == nbr->iface->self)
return;
if (evtimer_del(&nbr->lsreq_tx_timer) == -1)
fatal("stop_ls_req_tx_timer");
}
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