367 lines
8.6 KiB
C
367 lines
8.6 KiB
C
/* $NetBSD: if.c,v 1.16 2014/03/18 00:16:49 christos Exp $ */
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/* $KAME: if.c,v 1.18 2002/05/31 10:10:03 itojun 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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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/ioctl.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_ether.h>
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#include <netinet/in.h>
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#include <netinet/icmp6.h>
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#include <netinet6/in6_var.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include <ifaddrs.h>
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#include "rtsold.h"
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static int ifsock;
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static int get_llflag(const char *);
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static void get_rtaddrs(int, struct sockaddr *, struct sockaddr **);
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int
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ifinit(void)
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{
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ifsock = rssock;
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return 0;
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}
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int
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interface_up(char *name)
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{
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struct ifreq ifr;
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int llflag;
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strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
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if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
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warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
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strerror(errno));
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return -1;
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}
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if (!(ifr.ifr_flags & IFF_UP)) {
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ifr.ifr_flags |= IFF_UP;
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if (ioctl(ifsock, SIOCSIFFLAGS, &ifr) < 0)
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warnmsg(LOG_ERR, __func__,
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"ioctl(SIOCSIFFLAGS): %s", strerror(errno));
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return -1;
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}
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warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
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llflag = get_llflag(name);
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if (llflag < 0) {
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warnmsg(LOG_WARNING, __func__,
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"get_llflag() failed, anyway I'll try");
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return 0;
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}
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if (!(llflag & IN6_IFF_NOTREADY)) {
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warnmsg(LOG_DEBUG, __func__, "%s is ready", name);
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return 0;
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} else {
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if (llflag & IN6_IFF_TENTATIVE) {
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warnmsg(LOG_DEBUG, __func__, "%s is tentative",
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name);
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return IFS_TENTATIVE;
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}
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if (llflag & IN6_IFF_DUPLICATED)
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warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
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name);
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return -1;
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}
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}
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int
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interface_status(struct ifinfo *ifinfo)
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{
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char *ifname = ifinfo->ifname;
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struct ifreq ifr;
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struct ifmediareq ifmr;
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/* get interface flags */
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
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warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
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ifname, strerror(errno));
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return -1;
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}
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/*
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* if one of UP and RUNNING flags is dropped,
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* the interface is not active.
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*/
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if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
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goto inactive;
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}
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/* Next, check carrier on the interface, if possible */
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if (!ifinfo->mediareqok)
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goto active;
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memset(&ifmr, 0, sizeof(ifmr));
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strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
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if (ioctl(ifsock, SIOCGIFMEDIA, &ifmr) < 0) {
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if (errno != EINVAL) {
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warnmsg(LOG_DEBUG, __func__,
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"ioctl(SIOCGIFMEDIA) on %s: %s",
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ifname, strerror(errno));
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return -1;
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}
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/*
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* EINVAL simply means that the interface does not support
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* the SIOCGIFMEDIA ioctl. We regard it alive.
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*/
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ifinfo->mediareqok = 0;
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goto active;
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}
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if (ifmr.ifm_status & IFM_AVALID) {
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switch (ifmr.ifm_active & IFM_NMASK) {
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case IFM_ETHER:
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if (ifmr.ifm_status & IFM_ACTIVE)
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goto active;
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else
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goto inactive;
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break;
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default:
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goto inactive;
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}
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}
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inactive:
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return 0;
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active:
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return 1;
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}
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#define ROUNDUP(a, size) \
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(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
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#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
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((char *)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
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sizeof(u_long)) : sizeof(u_long)))
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#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
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size_t
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lladdropt_length(struct sockaddr_dl *sdl)
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{
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switch (sdl->sdl_type) {
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case IFT_ETHER:
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#ifdef IFT_IEEE80211
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case IFT_IEEE80211:
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#endif
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return ROUNDUP8(ETHER_ADDR_LEN + 2);
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default:
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return 0;
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}
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}
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void
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lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
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{
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char *addr;
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ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
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switch (sdl->sdl_type) {
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case IFT_ETHER:
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#ifdef IFT_IEEE80211
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case IFT_IEEE80211:
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#endif
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ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
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addr = (char *)(ndopt + 1);
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memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
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break;
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default:
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warnmsg(LOG_ERR, __func__,
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"unsupported link type(%d)", sdl->sdl_type);
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exit(1);
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}
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return;
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}
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struct sockaddr_dl *
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if_nametosdl(char *name)
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{
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int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
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char *buf, *next, *lim;
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size_t len;
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struct if_msghdr *ifm;
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struct sockaddr *sa, *rti_info[RTAX_MAX];
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struct sockaddr_dl *sdl = NULL, *ret_sdl;
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if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
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return NULL;
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if ((buf = malloc(len)) == NULL)
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return NULL;
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if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
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free(buf);
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return NULL;
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}
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lim = buf + len;
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for (next = buf; next < lim; next += ifm->ifm_msglen) {
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ifm = (struct if_msghdr *)next;
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if (ifm->ifm_type == RTM_IFINFO) {
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sa = (struct sockaddr *)(ifm + 1);
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get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
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if ((sa = rti_info[RTAX_IFP]) != NULL) {
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if (sa->sa_family == AF_LINK) {
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sdl = (struct sockaddr_dl *)sa;
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if (strlen(name) != sdl->sdl_nlen)
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continue; /* not same len */
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if (strncmp(&sdl->sdl_data[0],
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name,
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sdl->sdl_nlen) == 0) {
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break;
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}
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}
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}
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}
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}
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if (next == lim || sdl == NULL) {
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/* search failed */
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free(buf);
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return NULL;
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}
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if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) {
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free(buf);
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return NULL;
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}
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memcpy(ret_sdl, sdl, sdl->sdl_len);
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free(buf);
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return(ret_sdl);
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}
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int
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getinet6sysctl(int code)
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{
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int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
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int value;
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size_t size;
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mib[3] = code;
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size = sizeof(value);
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if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
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return -1;
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else
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return value;
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}
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/*------------------------------------------------------------*/
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/* get ia6_flags for link-local addr on if. returns -1 on error. */
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static int
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get_llflag(const char *name)
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{
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struct ifaddrs *ifap, *ifa;
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struct in6_ifreq ifr6;
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struct sockaddr_in6 *sin6;
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int s;
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if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
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warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
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strerror(errno));
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exit(1);
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}
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if (getifaddrs(&ifap) != 0) {
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warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
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strerror(errno));
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exit(1);
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}
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
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if (strlen(ifa->ifa_name) != strlen(name) ||
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strncmp(ifa->ifa_name, name, strlen(name)) != 0)
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continue;
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if (ifa->ifa_addr->sa_family != AF_INET6)
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continue;
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sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
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if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
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continue;
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memset(&ifr6, 0, sizeof(ifr6));
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strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
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memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
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if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
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warnmsg(LOG_ERR, __func__,
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"ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
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exit(1);
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}
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freeifaddrs(ifap);
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close(s);
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return ifr6.ifr_ifru.ifru_flags6;
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}
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freeifaddrs(ifap);
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close(s);
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return -1;
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}
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static void
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get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
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{
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int i;
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for (i = 0; i < RTAX_MAX; i++) {
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if (addrs & (1 << i)) {
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rti_info[i] = sa;
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NEXT_SA(sa);
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} else
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rti_info[i] = NULL;
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}
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}
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