mirror of
https://git.FreeBSD.org/src.git
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197 lines
5.8 KiB
C
197 lines
5.8 KiB
C
/* $KAME: probe.c,v 1.17 2003/10/05 00:09:36 itojun Exp $ */
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/*
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* Copyright (C) 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/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/uio.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/nd6.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <syslog.h>
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#include <stdlib.h>
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#include "rtsold.h"
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static struct msghdr sndmhdr;
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static struct iovec sndiov[2];
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static int probesock;
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static void sendprobe(struct in6_addr *, struct ifinfo *);
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int
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probe_init(void)
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{
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int scmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
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CMSG_SPACE(sizeof(int));
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static u_char *sndcmsgbuf = NULL;
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if (sndcmsgbuf == NULL &&
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(sndcmsgbuf = (u_char *)malloc(scmsglen)) == NULL) {
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warnmsg(LOG_ERR, __func__, "malloc failed");
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return (-1);
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}
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if ((probesock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) {
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warnmsg(LOG_ERR, __func__, "socket: %s", strerror(errno));
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return (-1);
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}
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/* make the socket send-only */
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if (shutdown(probesock, 0)) {
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warnmsg(LOG_ERR, __func__, "shutdown: %s", strerror(errno));
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return (-1);
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}
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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 = scmsglen;
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return (0);
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}
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/*
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* Probe if each router in the default router list is still alive.
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*/
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void
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defrouter_probe(struct ifinfo *ifinfo)
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{
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struct in6_defrouter *p, *ep;
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int ifindex, mib[4];
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char *buf, ntopbuf[INET6_ADDRSTRLEN];
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size_t l;
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ifindex = ifinfo->sdl->sdl_index;
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if (ifindex == 0)
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return;
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mib[0] = CTL_NET;
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mib[1] = PF_INET6;
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mib[2] = IPPROTO_ICMPV6;
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mib[3] = ICMPV6CTL_ND6_DRLIST;
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if (sysctl(mib, nitems(mib), NULL, &l, NULL, 0) < 0) {
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warnmsg(LOG_ERR, __func__, "sysctl(ICMPV6CTL_ND6_DRLIST): %s",
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strerror(errno));
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return;
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}
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if (l == 0)
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return;
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buf = malloc(l);
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if (buf == NULL) {
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warnmsg(LOG_ERR, __func__, "malloc(): %s", strerror(errno));
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return;
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}
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if (sysctl(mib, nitems(mib), buf, &l, NULL, 0) < 0) {
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warnmsg(LOG_ERR, __func__, "sysctl(ICMPV6CTL_ND6_DRLIST): %s",
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strerror(errno));
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free(buf);
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return;
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}
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ep = (struct in6_defrouter *)(void *)(buf + l);
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for (p = (struct in6_defrouter *)(void *)buf; p < ep; p++) {
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if (ifindex != p->if_index)
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continue;
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if (!IN6_IS_ADDR_LINKLOCAL(&p->rtaddr.sin6_addr)) {
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warnmsg(LOG_ERR, __func__,
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"default router list contains a "
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"non-link-local address(%s)",
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inet_ntop(AF_INET6, &p->rtaddr.sin6_addr, ntopbuf,
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INET6_ADDRSTRLEN));
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continue; /* ignore the address */
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}
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sendprobe(&p->rtaddr.sin6_addr, ifinfo);
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}
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free(buf);
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}
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static void
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sendprobe(struct in6_addr *addr, struct ifinfo *ifinfo)
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{
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u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
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struct sockaddr_in6 sa6_probe;
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struct in6_pktinfo *pi;
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struct cmsghdr *cm;
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u_int32_t ifindex = ifinfo->sdl->sdl_index;
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int hoplimit = 1;
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memset(&sa6_probe, 0, sizeof(sa6_probe));
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sa6_probe.sin6_family = AF_INET6;
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sa6_probe.sin6_len = sizeof(sa6_probe);
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sa6_probe.sin6_addr = *addr;
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sa6_probe.sin6_scope_id = ifinfo->linkid;
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sndmhdr.msg_name = (caddr_t)&sa6_probe;
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sndmhdr.msg_iov[0].iov_base = NULL;
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sndmhdr.msg_iov[0].iov_len = 0;
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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 *)(void *)CMSG_DATA(cm);
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memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
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pi->ipi6_ifindex = ifindex;
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/* specify the hop limit of the packet for safety */
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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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warnmsg(LOG_DEBUG, __func__, "probe a router %s on %s",
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inet_ntop(AF_INET6, addr, ntopbuf, INET6_ADDRSTRLEN),
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if_indextoname(ifindex, ifnamebuf));
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if (sendmsg(probesock, &sndmhdr, 0))
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warnmsg(LOG_ERR, __func__, "sendmsg on %s: %s",
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if_indextoname(ifindex, ifnamebuf), strerror(errno));
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}
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