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/* $OpenBSD: lsreq.c,v 1.2 2005/01/28 17:53:33 norby 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"
extern struct imsgbuf *ibuf_rde;
/* 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;
char *buf = NULL;
char *ptr;
int ret = 0;
log_debug("send_ls_req: neighbor ID %s", inet_ntoa(nbr->id));
if (nbr->iface->passive)
return (0);
/* XXX use buffer API instead for better decoupling */
if ((ptr = buf = calloc(1, READ_BUF_SIZE)) == 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 */
gen_ospf_hdr(ptr, nbr->iface, PACKET_TYPE_LS_REQUEST);
ptr += sizeof(struct ospf_hdr);
/* LSA header(s) */
for (le = TAILQ_FIRST(&nbr->ls_req_list); le != NULL &&
(ptr - buf) < nbr->iface->mtu - PACKET_HDR; le = nle) {
nbr->ls_req = nle = TAILQ_NEXT(le, entry);
ls_req_hdr = (struct ls_req_hdr *)ptr;
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;
ptr += sizeof(*ls_req_hdr);
}
/* update authentication and calculate checksum */
auth_gen(buf, ptr - buf, nbr->iface);
if ((ret = send_packet(nbr->iface, buf, (ptr - buf), &dst)) == -1)
log_warnx("send_ls_req: error sending packet on "
"interface %s", nbr->iface->name);
free(buf);
return (ret);
}
void
recv_ls_req(struct nbr *nbr, char *buf, u_int16_t len)
{
log_debug("recv_ls_req: neighbor ID %s", inet_ntoa(nbr->id));
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", nbr_state_name(nbr->state),
inet_ntoa(nbr->id));
nbr_fsm(nbr, NBR_EVT_ADJ_OK);
break;
case NBR_STA_XCHNG:
case NBR_STA_LOAD:
case NBR_STA_FULL:
imsg_compose(ibuf_rde, IMSG_LS_REQ, nbr->peerid, 0, -1,
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);
}
if (ls_req_list_empty(nbr))
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;
}
bool
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;
log_debug("ls_req_tx_timer: neighbor ID %s", inet_ntoa(nbr->id));
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", inet_ntoa(nbr->id));
break;
}
/* reschedule lsreq_tx_timer */
if (nbr->state == NBR_STA_LOAD) {
timerclear(&tv);
tv.tv_sec = nbr->iface->rxmt_interval;
log_debug("ls_req_tx_timer: reschedule neighbor ID %s",
inet_ntoa(nbr->id));
evtimer_add(&nbr->lsreq_tx_timer, &tv);
}
}
int
start_ls_req_tx_timer(struct nbr *nbr)
{
struct timeval tv;
if (nbr == nbr->iface->self)
return (0);
log_debug("start_ls_req_tx_timer: neighbor ID %s", inet_ntoa(nbr->id));
timerclear(&tv);
return (evtimer_add(&nbr->lsreq_tx_timer, &tv));
}
int
stop_ls_req_tx_timer(struct nbr *nbr)
{
if (nbr == nbr->iface->self)
return (0);
log_debug("stop_ls_req_tx_timer: neighbor ID %s", inet_ntoa(nbr->id));
return (evtimer_del(&nbr->lsreq_tx_timer));
}
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