274 lines
7.3 KiB
C
274 lines
7.3 KiB
C
/* $OpenBSD: hello.c,v 1.26 2022/12/28 21:30:18 jmc Exp $ */
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/*
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* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
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* Copyright (c) 2004, 2005 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 "ospfd.h"
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#include "ospf.h"
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#include "log.h"
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#include "ospfe.h"
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extern struct ospfd_conf *oeconf;
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/* hello packet handling */
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int
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send_hello(struct iface *iface)
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{
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struct sockaddr_in dst;
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struct hello_hdr hello;
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struct nbr *nbr;
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struct ibuf *buf;
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dst.sin_family = AF_INET;
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dst.sin_len = sizeof(struct sockaddr_in);
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switch (iface->type) {
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case IF_TYPE_POINTOPOINT:
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case IF_TYPE_BROADCAST:
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inet_aton(AllSPFRouters, &dst.sin_addr);
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break;
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case IF_TYPE_NBMA:
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case IF_TYPE_POINTOMULTIPOINT:
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log_debug("send_hello: type %s not supported, interface %s",
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if_type_name(iface->type), iface->name);
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return (-1);
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case IF_TYPE_VIRTUALLINK:
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dst.sin_addr = iface->dst;
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break;
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default:
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fatalx("send_hello: unknown interface type");
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}
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if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
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IP_MAXPACKET - sizeof(struct ip))) == NULL)
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fatal("send_hello");
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/* OSPF header */
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if (gen_ospf_hdr(buf, iface, PACKET_TYPE_HELLO))
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goto fail;
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/* hello header */
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hello.mask = iface->mask.s_addr;
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hello.hello_interval = htons(iface->hello_interval);
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hello.opts = area_ospf_options(iface->area);
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hello.rtr_priority = iface->priority;
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hello.rtr_dead_interval = htonl(iface->dead_interval);
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if (iface->dr) {
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hello.d_rtr = iface->dr->addr.s_addr;
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iface->self->dr.s_addr = iface->dr->addr.s_addr;
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} else
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hello.d_rtr = 0;
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if (iface->bdr) {
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hello.bd_rtr = iface->bdr->addr.s_addr;
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iface->self->bdr.s_addr = iface->bdr->addr.s_addr;
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} else
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hello.bd_rtr = 0;
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if (ibuf_add(buf, &hello, sizeof(hello)))
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goto fail;
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/* active neighbor(s) */
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LIST_FOREACH(nbr, &iface->nbr_list, entry) {
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if ((nbr->state >= NBR_STA_INIT) && (nbr != iface->self))
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if (ibuf_add(buf, &nbr->id, sizeof(nbr->id)))
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goto fail;
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}
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/* update authentication and calculate checksum */
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if (auth_gen(buf, iface))
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goto fail;
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if (send_packet(iface, buf, &dst) == -1)
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goto fail;
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ibuf_free(buf);
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return (0);
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fail:
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log_warn("%s", __func__);
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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_hello(struct iface *iface, struct in_addr src, u_int32_t rtr_id, char *buf,
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u_int16_t len)
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{
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struct hello_hdr hello;
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struct nbr *nbr = NULL, *dr;
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u_int32_t nbr_id;
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int nbr_change = 0;
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if (len < sizeof(hello) || (len & 0x03)) {
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log_warnx("recv_hello: bad packet size, interface %s",
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iface->name);
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return;
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}
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memcpy(&hello, buf, sizeof(hello));
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buf += sizeof(hello);
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len -= sizeof(hello);
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if (iface->type != IF_TYPE_POINTOPOINT &&
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iface->type != IF_TYPE_VIRTUALLINK)
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if (hello.mask != iface->mask.s_addr) {
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log_warnx("recv_hello: invalid netmask, interface %s",
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iface->name);
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return;
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}
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if (ntohs(hello.hello_interval) != iface->hello_interval) {
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log_warnx("recv_hello: invalid hello-interval %d, "
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"interface %s", ntohs(hello.hello_interval),
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iface->name);
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return;
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}
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if (ntohl(hello.rtr_dead_interval) != iface->dead_interval) {
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log_warnx("recv_hello: invalid router-dead-interval %d, "
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"interface %s", ntohl(hello.rtr_dead_interval),
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iface->name);
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return;
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}
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if ((hello.opts & OSPF_OPTION_E && iface->area->stub) ||
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((hello.opts & OSPF_OPTION_E) == 0 && !iface->area->stub)) {
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log_warnx("recv_hello: ExternalRoutingCapability mismatch, "
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"interface %s", iface->name);
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return;
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}
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/*
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* Match router-id, in case of conflict moan and ignore hello.
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* Only the router-id is compared since the source IP on NBMA,
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* broadcast and point-to-multipoint interfaces was already
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* compared in find_iface() and only IPs in the same subnet
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* are accepted. This is not exactly what the RFC specifies
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* but works far better.
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*/
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LIST_FOREACH(nbr, &iface->nbr_list, entry) {
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if (nbr == iface->self) {
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if (nbr->id.s_addr == rtr_id) {
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log_warnx("recv_hello: Router-ID collision on "
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"interface %s neighbor IP %s", iface->name,
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inet_ntoa(src));
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return;
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}
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continue;
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}
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if (nbr->id.s_addr == rtr_id)
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break;
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}
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if (!nbr) {
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nbr = nbr_new(rtr_id, iface, 0);
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/* set neighbor parameters */
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nbr->dr.s_addr = hello.d_rtr;
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nbr->bdr.s_addr = hello.bd_rtr;
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nbr->priority = hello.rtr_priority;
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/* XXX neighbor address shouldn't be stored on virtual links */
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nbr->addr.s_addr = src.s_addr;
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ospfe_imsg_compose_rde(IMSG_NEIGHBOR_ADDR, nbr->peerid, 0,
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&src, sizeof(src));
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}
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if (nbr->addr.s_addr != src.s_addr) {
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log_warnx("%s: neighbor ID %s changed its IP address",
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__func__, inet_ntoa(nbr->id));
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nbr->addr.s_addr = src.s_addr;
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ospfe_imsg_compose_rde(IMSG_NEIGHBOR_ADDR, nbr->peerid, 0,
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&src, sizeof(src));
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}
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nbr->options = hello.opts;
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nbr_fsm(nbr, NBR_EVT_HELLO_RCVD);
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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 == ospfe_router_id()) {
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/* seen myself */
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if (nbr->state & NBR_STA_PRELIM) {
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nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD);
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nbr_change = 1;
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}
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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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/* set neighbor parameters */
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nbr->dr.s_addr = hello.d_rtr;
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nbr->bdr.s_addr = hello.bd_rtr;
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nbr->priority = hello.rtr_priority;
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return;
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}
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if (nbr->priority != hello.rtr_priority) {
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nbr->priority = hello.rtr_priority;
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nbr_change = 1;
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}
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if (iface->state & IF_STA_WAITING &&
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hello.d_rtr == nbr->addr.s_addr && hello.bd_rtr == 0)
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if_fsm(iface, IF_EVT_BACKUP_SEEN);
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if (iface->state & IF_STA_WAITING && hello.bd_rtr == nbr->addr.s_addr) {
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/*
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* In case we see the BDR make sure that the DR is around
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* with a bidirectional (2_WAY or better) connection
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*/
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LIST_FOREACH(dr, &iface->nbr_list, entry)
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if (hello.d_rtr == dr->addr.s_addr &&
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dr->state & NBR_STA_BIDIR)
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if_fsm(iface, IF_EVT_BACKUP_SEEN);
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}
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if ((nbr->addr.s_addr == nbr->dr.s_addr &&
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nbr->addr.s_addr != hello.d_rtr) ||
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(nbr->addr.s_addr != nbr->dr.s_addr &&
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nbr->addr.s_addr == hello.d_rtr))
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/* neighbor changed from or to DR */
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nbr_change = 1;
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if ((nbr->addr.s_addr == nbr->bdr.s_addr &&
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nbr->addr.s_addr != hello.bd_rtr) ||
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(nbr->addr.s_addr != nbr->bdr.s_addr &&
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nbr->addr.s_addr == hello.bd_rtr))
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/* neighbor changed from or to BDR */
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nbr_change = 1;
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nbr->dr.s_addr = hello.d_rtr;
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nbr->bdr.s_addr = hello.bd_rtr;
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if (nbr_change)
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if_fsm(iface, IF_EVT_NBR_CHNG);
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/* TODO NBMA needs some special handling */
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}
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