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/* $OpenBSD: probe.c,v 1.1 2006/06/01 14:12:20 norby Exp $ */
/*
* Copyright (c) 2005, 2006 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 <sys/time.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#include <event.h>
#include "igmp.h"
#include "dvmrpd.h"
#include "dvmrp.h"
#include "log.h"
#include "dvmrpe.h"
extern struct dvmrpd_conf *deconf;
/* DVMRP probe packet handling */
int
send_probe(struct iface *iface)
{
struct sockaddr_in dst;
struct buf *buf;
struct dvmrp_hdr *dvmrp_hdr;
struct nbr *nbr;
int ret = 0;
if (iface->passive)
return (0);
if ((buf = buf_open(iface->mtu - sizeof(struct ip))) == NULL)
fatal("send_probe");
/* DVMRP header */
if (gen_dvmrp_hdr(buf, iface, DVMRP_CODE_PROBE))
goto fail;
/* generation ID */
buf_add(buf, &iface->gen_id, sizeof(iface->gen_id));
/* generate neighbor list */
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr->state > NBR_STA_DOWN)
buf_add(buf, &nbr->id, sizeof(nbr->id));
}
/* set destination address */
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
inet_aton(AllDVMRPRouters, &dst.sin_addr);
/* update chksum */
dvmrp_hdr = buf_seek(buf, 0, sizeof(dvmrp_hdr));
dvmrp_hdr->chksum = in_cksum(buf->buf, buf->wpos);
ret = send_packet(iface, buf->buf, buf->wpos, &dst);
buf_free(buf);
return (ret);
fail:
log_warn("send_probe");
buf_free(buf);
return (-1);
}
void
recv_probe(struct iface *iface, struct in_addr src, u_int32_t src_ip,
u_int8_t capabilities, char *buf, u_int16_t len)
{
struct nbr *nbr = NULL;
u_int32_t gen_id;
u_int32_t nbr_id;
LIST_FOREACH(nbr, &iface->nbr_list, entry) {
if (nbr->id.s_addr == src_ip)
break;
}
memcpy(&gen_id, buf, sizeof(gen_id));
len -= sizeof(gen_id);
buf += sizeof(gen_id);
if (!nbr) {
nbr = nbr_new(src_ip, iface, 0);
nbr->gen_id = gen_id;
nbr->capabilities = capabilities;
nbr->addr = src;
}
nbr_fsm(nbr, NBR_EVT_PROBE_RCVD);
if ((nbr->gen_id != gen_id) || (nbr->capabilities != capabilities)) {
if (!nbr->compat)
nbr_fsm(nbr, NBR_EVT_1_WAY_RCVD);
nbr->gen_id = gen_id;
nbr->capabilities = capabilities;
/* XXX handle nbr change! */
}
while (len >= sizeof(nbr_id)) {
memcpy(&nbr_id, buf, sizeof(nbr_id));
if (nbr_id == iface->addr.s_addr) {
/* seen myself */
if (nbr->state < NBR_STA_2_WAY)
nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD);
break;
}
buf += sizeof(nbr_id);
len -= sizeof(nbr_id);
}
if (len == 0) {
nbr_fsm(nbr, NBR_EVT_1_WAY_RCVD);
return;
}
/* XXX len correct?? */
return;
}
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