134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/* $OpenBSD: probe.c,v 1.6 2024/04/23 13:34:51 jsg Exp $ */
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/*
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* Copyright (c) 2005, 2006 Esben Norby <norby@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include <string.h>
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#include <event.h>
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#include "igmp.h"
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#include "dvmrpd.h"
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#include "dvmrp.h"
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#include "log.h"
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#include "dvmrpe.h"
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extern struct dvmrpd_conf *deconf;
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/* DVMRP probe packet handling */
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int
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send_probe(struct iface *iface)
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{
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struct sockaddr_in dst;
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struct ibuf *buf;
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struct nbr *nbr;
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int ret = 0;
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if (iface->passive)
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return (0);
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if ((buf = ibuf_open(iface->mtu - sizeof(struct ip))) == NULL)
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fatal("send_probe");
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/* DVMRP header */
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if (gen_dvmrp_hdr(buf, iface, DVMRP_CODE_PROBE))
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goto fail;
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/* generation ID */
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ibuf_add(buf, &iface->gen_id, sizeof(iface->gen_id));
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/* generate neighbor list */
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LIST_FOREACH(nbr, &iface->nbr_list, entry) {
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if (nbr->state > NBR_STA_DOWN)
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ibuf_add(buf, &nbr->id, sizeof(nbr->id));
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}
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/* set destination address */
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dst.sin_family = AF_INET;
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dst.sin_len = sizeof(struct sockaddr_in);
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inet_aton(AllDVMRPRouters, &dst.sin_addr);
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ret = send_packet(iface, buf, &dst);
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ibuf_free(buf);
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return (ret);
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fail:
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log_warn("send_probe");
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ibuf_free(buf);
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return (-1);
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}
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void
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recv_probe(struct iface *iface, struct in_addr src, u_int32_t src_ip,
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u_int8_t capabilities, char *buf, u_int16_t len)
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{
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struct nbr *nbr = NULL;
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u_int32_t gen_id;
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u_int32_t nbr_id;
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LIST_FOREACH(nbr, &iface->nbr_list, entry) {
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if (nbr->id.s_addr == src_ip)
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break;
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}
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memcpy(&gen_id, buf, sizeof(gen_id));
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len -= sizeof(gen_id);
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buf += sizeof(gen_id);
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if (!nbr) {
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nbr = nbr_new(src_ip, iface, 0);
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nbr->gen_id = gen_id;
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nbr->capabilities = capabilities;
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nbr->addr = src;
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}
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nbr_fsm(nbr, NBR_EVT_PROBE_RCVD);
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if ((nbr->gen_id != gen_id) || (nbr->capabilities != capabilities)) {
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if (!nbr->compat)
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nbr_fsm(nbr, NBR_EVT_1_WAY_RCVD);
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nbr->gen_id = gen_id;
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nbr->capabilities = capabilities;
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/* XXX handle nbr change! */
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}
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while (len >= sizeof(nbr_id)) {
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memcpy(&nbr_id, buf, sizeof(nbr_id));
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if (nbr_id == iface->addr.s_addr) {
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/* seen myself */
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if (nbr->state < NBR_STA_2_WAY)
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nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD);
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break;
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}
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buf += sizeof(nbr_id);
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len -= sizeof(nbr_id);
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}
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if (len == 0) {
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nbr_fsm(nbr, NBR_EVT_1_WAY_RCVD);
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return;
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}
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/* XXX len correct?? */
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return;
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}
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