16837d2d21
destination. (Currently lack of their specification does not lead to any problem, because kernel does not check the consistency between actual address and its address family / length on raw socket. However kernel should always check their consistency and stop sending packets if there is a contradiction. Considering backward compatibility of programs, I just fixed rtsol now; I'd like to fix the kernel behavior later.) Reviewed by: ume MFC after: 3 days
346 lines
9.7 KiB
C
346 lines
9.7 KiB
C
/* $KAME: rtsol.c,v 1.12 2001/11/12 11:47:11 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <arpa/inet.h>
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#include <time.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include "rtsold.h"
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#define ALLROUTER "ff02::2"
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static struct msghdr rcvmhdr;
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static struct msghdr sndmhdr;
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static struct iovec rcviov[2];
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static struct iovec sndiov[2];
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static struct sockaddr_in6 from;
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int rssock;
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static struct sockaddr_in6 sin6_allrouters = {sizeof(sin6_allrouters), AF_INET6};
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int
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sockopen()
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{
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int on;
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struct icmp6_filter filt;
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static u_char answer[1500];
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int rcvcmsglen, sndcmsglen;
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static u_char *rcvcmsgbuf = NULL, *sndcmsgbuf = NULL;
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sndcmsglen = rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
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CMSG_SPACE(sizeof(int));
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if (rcvcmsgbuf == NULL && (rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
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warnmsg(LOG_ERR, __FUNCTION__,
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"malloc for receive msghdr failed");
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return(-1);
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}
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if (sndcmsgbuf == NULL && (sndcmsgbuf = malloc(sndcmsglen)) == NULL) {
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warnmsg(LOG_ERR, __FUNCTION__,
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"malloc for send msghdr failed");
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return(-1);
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}
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memset(&sin6_allrouters, 0, sizeof(struct sockaddr_in6));
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sin6_allrouters.sin6_family = AF_INET6;
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sin6_allrouters.sin6_len = sizeof(sin6_allrouters);
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if (inet_pton(AF_INET6, ALLROUTER,
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&sin6_allrouters.sin6_addr.s6_addr) != 1) {
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warnmsg(LOG_ERR, __FUNCTION__, "inet_pton failed for %s",
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ALLROUTER);
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return(-1);
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}
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if ((rssock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
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warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
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return(-1);
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}
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/* specify to tell receiving interface */
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on = 1;
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#ifdef IPV6_RECVPKTINFO
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if (setsockopt(rssock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
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sizeof(on)) < 0) {
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warnmsg(LOG_ERR, __FUNCTION__, "IPV6_RECVPKTINFO: %s",
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strerror(errno));
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exit(1);
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}
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#else /* old adv. API */
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if (setsockopt(rssock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
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sizeof(on)) < 0) {
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warnmsg(LOG_ERR, __FUNCTION__, "IPV6_PKTINFO: %s",
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strerror(errno));
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exit(1);
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}
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#endif
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on = 1;
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/* specify to tell value of hoplimit field of received IP6 hdr */
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#ifdef IPV6_RECVHOPLIMIT
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if (setsockopt(rssock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
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sizeof(on)) < 0) {
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warnmsg(LOG_ERR, __FUNCTION__, "IPV6_RECVHOPLIMIT: %s",
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strerror(errno));
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exit(1);
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}
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#else /* old adv. API */
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if (setsockopt(rssock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
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sizeof(on)) < 0) {
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warnmsg(LOG_ERR, __FUNCTION__, "IPV6_HOPLIMIT: %s",
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strerror(errno));
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exit(1);
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}
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#endif
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/* specfiy to accept only router advertisements on the socket */
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ICMP6_FILTER_SETBLOCKALL(&filt);
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ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
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if (setsockopt(rssock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
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sizeof(filt)) == -1) {
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warnmsg(LOG_ERR, __FUNCTION__, "setsockopt(ICMP6_FILTER): %s",
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strerror(errno));
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return(-1);
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}
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/* initialize msghdr for receiving packets */
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rcviov[0].iov_base = (caddr_t)answer;
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rcviov[0].iov_len = sizeof(answer);
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rcvmhdr.msg_name = (caddr_t)&from;
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rcvmhdr.msg_namelen = sizeof(from);
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rcvmhdr.msg_iov = rcviov;
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rcvmhdr.msg_iovlen = 1;
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rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
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rcvmhdr.msg_controllen = rcvcmsglen;
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/* initialize msghdr for sending packets */
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sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
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sndmhdr.msg_iov = sndiov;
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sndmhdr.msg_iovlen = 1;
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sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
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sndmhdr.msg_controllen = sndcmsglen;
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return(rssock);
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}
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void
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sendpacket(struct ifinfo *ifinfo)
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{
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int i;
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struct cmsghdr *cm;
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struct in6_pktinfo *pi;
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sndmhdr.msg_name = (caddr_t)&sin6_allrouters;
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sndmhdr.msg_iov[0].iov_base = (caddr_t)ifinfo->rs_data;
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sndmhdr.msg_iov[0].iov_len = ifinfo->rs_datalen;
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cm = CMSG_FIRSTHDR(&sndmhdr);
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/* specify the outgoing interface */
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cm->cmsg_level = IPPROTO_IPV6;
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cm->cmsg_type = IPV6_PKTINFO;
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cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
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pi = (struct in6_pktinfo *)CMSG_DATA(cm);
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memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
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pi->ipi6_ifindex = ifinfo->sdl->sdl_index;
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/* specify the hop limit of the packet */
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{
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int hoplimit = 255;
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cm = CMSG_NXTHDR(&sndmhdr, cm);
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cm->cmsg_level = IPPROTO_IPV6;
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cm->cmsg_type = IPV6_HOPLIMIT;
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cm->cmsg_len = CMSG_LEN(sizeof(int));
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memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
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}
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warnmsg(LOG_DEBUG,
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__FUNCTION__, "send RS on %s, whose state is %d",
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ifinfo->ifname, ifinfo->state);
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i = sendmsg(rssock, &sndmhdr, 0);
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if (i < 0 || i != ifinfo->rs_datalen) {
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/*
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* ENETDOWN is not so serious, especially when using several
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* network cards on a mobile node. We ignore it.
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*/
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if (errno != ENETDOWN || dflag > 0)
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warnmsg(LOG_ERR, __FUNCTION__, "sendmsg on %s: %s",
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ifinfo->ifname, strerror(errno));
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}
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/* update counter */
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ifinfo->probes++;
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}
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void
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rtsol_input(int s)
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{
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int i;
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int *hlimp = NULL;
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struct icmp6_hdr *icp;
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int ifindex = 0;
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struct cmsghdr *cm;
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struct in6_pktinfo *pi = NULL;
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struct ifinfo *ifi = NULL;
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u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
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/* get message */
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if ((i = recvmsg(s, &rcvmhdr, 0)) < 0) {
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warnmsg(LOG_ERR, __FUNCTION__, "recvmsg: %s", strerror(errno));
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return;
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}
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/* extract optional information via Advanced API */
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for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
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cm;
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cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
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if (cm->cmsg_level == IPPROTO_IPV6 &&
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cm->cmsg_type == IPV6_PKTINFO &&
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cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
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pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
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ifindex = pi->ipi6_ifindex;
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}
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if (cm->cmsg_level == IPPROTO_IPV6 &&
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cm->cmsg_type == IPV6_HOPLIMIT &&
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cm->cmsg_len == CMSG_LEN(sizeof(int)))
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hlimp = (int *)CMSG_DATA(cm);
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}
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if (ifindex == 0) {
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warnmsg(LOG_ERR,
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__FUNCTION__, "failed to get receiving interface");
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return;
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}
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if (hlimp == NULL) {
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warnmsg(LOG_ERR,
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__FUNCTION__, "failed to get receiving hop limit");
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return;
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}
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if (i < sizeof(struct nd_router_advert)) {
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warnmsg(LOG_ERR,
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__FUNCTION__, "packet size(%d) is too short", i);
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return;
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}
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icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
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if (icp->icmp6_type != ND_ROUTER_ADVERT) {
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warnmsg(LOG_ERR, __FUNCTION__,
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"invalid icmp type(%d) from %s on %s", icp->icmp6_type,
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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if (icp->icmp6_code != 0) {
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warnmsg(LOG_ERR, __FUNCTION__,
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"invalid icmp code(%d) from %s on %s", icp->icmp6_code,
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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if (*hlimp != 255) {
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warnmsg(LOG_NOTICE, __FUNCTION__,
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"invalid RA with hop limit(%d) from %s on %s",
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*hlimp,
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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if (pi && !IN6_IS_ADDR_LINKLOCAL(&from.sin6_addr)) {
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warnmsg(LOG_NOTICE, __FUNCTION__,
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"invalid RA with non link-local source from %s on %s",
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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/* xxx: more validation? */
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if ((ifi = find_ifinfo(pi->ipi6_ifindex)) == NULL) {
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warnmsg(LOG_NOTICE, __FUNCTION__,
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"received RA from %s on an unexpeced IF(%s)",
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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if_indextoname(pi->ipi6_ifindex, ifnamebuf));
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return;
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}
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warnmsg(LOG_DEBUG, __FUNCTION__,
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"received RA from %s on %s, state is %d",
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inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN),
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ifi->ifname, ifi->state);
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ifi->racnt++;
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switch(ifi->state) {
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case IFS_IDLE: /* should be ignored */
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case IFS_DELAY: /* right? */
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break;
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case IFS_PROBE:
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ifi->state = IFS_IDLE;
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ifi->probes = 0;
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rtsol_timer_update(ifi);
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break;
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}
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}
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