2009-09-12 22:08:20 +00:00
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/*
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* Copyright (c) 2009 Hiroki Sato. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.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 <net/if.h>
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#include <net/route.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ifaddrs.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <net/if_var.h>
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#include <netinet/in_var.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <netinet6/nd6.h>
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#include "ifconfig.h"
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#define MAX_SYSCTL_TRY 5
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2009-10-12 21:11:50 +00:00
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#define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \
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"\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \
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"\020DEFAULTIF"
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2009-09-12 22:08:20 +00:00
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static int isnd6defif(int);
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void setnd6flags(const char *, int, int, const struct afswtch *);
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void setnd6defif(const char *, int, int, const struct afswtch *);
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void
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setnd6flags(const char *dummyaddr __unused,
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int d, int s,
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const struct afswtch *afp)
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{
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struct in6_ndireq nd;
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int error;
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memset(&nd, 0, sizeof(nd));
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strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
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error = ioctl(s, SIOCGIFINFO_IN6, &nd);
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if (error) {
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warn("ioctl(SIOCGIFINFO_IN6)");
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return;
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}
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if (d < 0)
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nd.ndi.flags &= ~(-d);
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else
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nd.ndi.flags |= d;
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error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd);
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if (error)
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warn("ioctl(SIOCSIFINFO_IN6)");
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}
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void
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setnd6defif(const char *dummyaddr __unused,
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int d, int s,
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const struct afswtch *afp)
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{
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struct in6_ndifreq ndifreq;
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int ifindex;
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int error;
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memset(&ndifreq, 0, sizeof(ndifreq));
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strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
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if (d < 0) {
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if (isnd6defif(s)) {
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/* ifindex = 0 means to remove default if */
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ifindex = 0;
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} else
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return;
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} else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) {
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warn("if_nametoindex(%s)", ndifreq.ifname);
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return;
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}
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ndifreq.ifindex = ifindex;
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error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq);
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if (error)
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warn("ioctl(SIOCSDEFIFACE_IN6)");
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}
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static int
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isnd6defif(int s)
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{
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struct in6_ndifreq ndifreq;
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unsigned int ifindex;
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int error;
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memset(&ndifreq, 0, sizeof(ndifreq));
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strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname));
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ifindex = if_nametoindex(ndifreq.ifname);
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error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq);
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if (error) {
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warn("ioctl(SIOCGDEFIFACE_IN6)");
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return (error);
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}
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return (ndifreq.ifindex == ifindex);
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}
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static void
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nd6_status(int s)
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{
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struct in6_ndireq nd;
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struct rt_msghdr *rtm;
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size_t needed;
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char *buf, *next;
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int mib[6], ntry;
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int s6;
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2009-10-12 21:11:50 +00:00
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int error;
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2009-09-12 22:08:20 +00:00
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int isinet6, isdefif;
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/* Check if the interface has at least one IPv6 address. */
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = AF_INET6;
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mib[4] = NET_RT_IFLIST;
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mib[5] = if_nametoindex(ifr.ifr_name);
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/* Try to prevent a race between two sysctls. */
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ntry = 0;
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do {
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error = sysctl(mib, 6, NULL, &needed, NULL, 0);
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if (error) {
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warn("sysctl(NET_RT_IFLIST)/estimate");
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return;
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}
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buf = malloc(needed);
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if (buf == NULL) {
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warn("malloc for sysctl(NET_RT_IFLIST) failed");
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return;
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}
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if ((error = sysctl(mib, 6, buf, &needed, NULL, 0)) < 0) {
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if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
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warn("sysctl(NET_RT_IFLIST)/get");
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free(buf);
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return;
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}
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free(buf);
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buf = NULL;
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}
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} while (buf == NULL);
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isinet6 = 0;
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for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)next;
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if (rtm->rtm_version != RTM_VERSION)
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continue;
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if (rtm->rtm_type == RTM_NEWADDR) {
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isinet6 = 1;
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break;
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}
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}
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free(buf);
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if (!isinet6)
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return;
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memset(&nd, 0, sizeof(nd));
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strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname));
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if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
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warn("socket(AF_INET6, SOCK_DGRAM)");
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return;
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}
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error = ioctl(s6, SIOCGIFINFO_IN6, &nd);
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if (error) {
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warn("ioctl(SIOCGIFINFO_IN6)");
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close(s6);
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return;
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}
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isdefif = isnd6defif(s6);
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close(s6);
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if (nd.ndi.flags == 0 && !isdefif)
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return;
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2009-10-12 21:11:50 +00:00
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printb("\tnd6 options",
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(unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS);
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putchar('\n');
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2009-09-12 22:08:20 +00:00
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}
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static struct afswtch af_nd6 = {
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.af_name = "nd6",
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.af_af = AF_LOCAL,
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.af_other_status= nd6_status,
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};
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static __constructor void
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nd6_ctor(void)
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{
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2011-05-31 14:40:21 +00:00
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if (!feature_present("inet6"))
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return;
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2009-09-12 22:08:20 +00:00
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af_register(&af_nd6);
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}
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