589 lines
13 KiB
C
589 lines
13 KiB
C
/* $FreeBSD$ */
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/* $KAME: if.c,v 1.17 2001/01/21 15:27:30 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 <net/if.h>
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#include <net/if_types.h>
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#ifdef __FreeBSD__
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# include <net/ethernet.h>
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#endif
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#include <ifaddrs.h>
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#ifdef __NetBSD__
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#include <net/if_ether.h>
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#endif
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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/icmp6.h>
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#ifdef __bsdi__
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# include <netinet/if_ether.h>
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#endif
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#ifdef __OpenBSD__
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#include <netinet/if_ether.h>
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#endif
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include "rtadvd.h"
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#include "if.h"
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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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((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
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sizeof(u_long)) :\
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sizeof(u_long)))
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struct if_msghdr **iflist;
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int iflist_init_ok;
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size_t ifblock_size;
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char *ifblock;
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static void get_iflist __P((char **buf, size_t *size));
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static void parse_iflist __P((struct if_msghdr ***ifmlist_p, char *buf,
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size_t bufsize));
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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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}
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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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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) {
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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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return(NULL);
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memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
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return(ret_sdl);
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}
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int
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if_getmtu(char *name)
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{
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struct ifaddrs *ifap, *ifa;
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struct if_data *ifd;
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u_long mtu = 0;
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if (getifaddrs(&ifap) < 0)
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return(0);
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
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if (strcmp(ifa->ifa_name, name) == 0) {
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ifd = ifa->ifa_data;
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if (ifd)
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mtu = ifd->ifi_mtu;
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break;
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}
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}
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freeifaddrs(ifap);
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#ifdef SIOCGIFMTU /* XXX: this ifdef may not be necessary */
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if (mtu == 0) {
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struct ifreq ifr;
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int s;
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if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
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return(0);
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ifr.ifr_addr.sa_family = AF_INET6;
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strncpy(ifr.ifr_name, name,
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sizeof(ifr.ifr_name));
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if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) {
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close(s);
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return(0);
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}
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close(s);
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mtu = ifr.ifr_mtu;
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}
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#endif
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return(mtu);
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}
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/* give interface index and its old flags, then new flags returned */
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int
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if_getflags(int ifindex, int oifflags)
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{
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struct ifreq ifr;
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int s;
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if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
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syslog(LOG_ERR, "<%s> socket: %s", __func__,
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strerror(errno));
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return (oifflags & ~IFF_UP);
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}
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if_indextoname(ifindex, ifr.ifr_name);
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if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
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syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s",
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__func__, ifr.ifr_name);
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close(s);
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return (oifflags & ~IFF_UP);
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}
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close(s);
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return (ifr.ifr_flags);
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}
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#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
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int
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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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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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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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syslog(LOG_ERR, "<%s> unsupported link type(%d)",
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__func__, 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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int
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rtbuf_len()
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{
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size_t len;
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int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
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if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
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return(-1);
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return(len);
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}
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#define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
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#define SIN6(s) ((struct sockaddr_in6 *)(s))
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#define SDL(s) ((struct sockaddr_dl *)(s))
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char *
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get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
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{
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struct rt_msghdr *rtm;
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struct ifa_msghdr *ifam;
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struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
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*lenp = 0;
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for (rtm = (struct rt_msghdr *)buf;
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rtm < (struct rt_msghdr *)lim;
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rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
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/* just for safety */
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if (!rtm->rtm_msglen) {
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syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
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"(buf=%p lim=%p rtm=%p)", __func__,
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buf, lim, rtm);
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break;
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}
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if (FILTER_MATCH(rtm->rtm_type, filter) == 0) {
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continue;
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}
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switch (rtm->rtm_type) {
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case RTM_GET:
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case RTM_ADD:
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case RTM_DELETE:
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/* address related checks */
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sa = (struct sockaddr *)(rtm + 1);
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get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
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if ((dst = rti_info[RTAX_DST]) == NULL ||
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dst->sa_family != AF_INET6)
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continue;
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if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
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IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
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continue;
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if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
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gw->sa_family != AF_LINK)
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continue;
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if (ifindex && SDL(gw)->sdl_index != ifindex)
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continue;
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if (rti_info[RTAX_NETMASK] == NULL)
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continue;
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/* found */
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*lenp = rtm->rtm_msglen;
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return (char *)rtm;
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/* NOTREACHED */
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case RTM_NEWADDR:
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case RTM_DELADDR:
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ifam = (struct ifa_msghdr *)rtm;
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/* address related checks */
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sa = (struct sockaddr *)(ifam + 1);
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get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
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if ((ifa = rti_info[RTAX_IFA]) == NULL ||
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(ifa->sa_family != AF_INET &&
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ifa->sa_family != AF_INET6))
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continue;
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if (ifa->sa_family == AF_INET6 &&
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(IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
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IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
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continue;
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if (ifindex && ifam->ifam_index != ifindex)
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continue;
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/* found */
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*lenp = ifam->ifam_msglen;
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return (char *)rtm;
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/* NOTREACHED */
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case RTM_IFINFO:
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/* found */
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*lenp = rtm->rtm_msglen;
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return (char *)rtm;
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/* NOTREACHED */
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}
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}
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return (char *)rtm;
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}
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#undef FILTER_MATCH
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struct in6_addr *
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get_addr(char *buf)
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{
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struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
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struct sockaddr *sa, *rti_info[RTAX_MAX];
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sa = (struct sockaddr *)(rtm + 1);
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get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
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return(&SIN6(rti_info[RTAX_DST])->sin6_addr);
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}
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int
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get_rtm_ifindex(char *buf)
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{
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struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
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struct sockaddr *sa, *rti_info[RTAX_MAX];
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sa = (struct sockaddr *)(rtm + 1);
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get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
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return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
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}
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int
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get_ifm_ifindex(char *buf)
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{
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struct if_msghdr *ifm = (struct if_msghdr *)buf;
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return ((int)ifm->ifm_index);
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}
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int
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get_ifam_ifindex(char *buf)
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{
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struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf;
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return ((int)ifam->ifam_index);
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}
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int
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get_ifm_flags(char *buf)
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{
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struct if_msghdr *ifm = (struct if_msghdr *)buf;
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return (ifm->ifm_flags);
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}
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int
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get_prefixlen(char *buf)
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{
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struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
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struct sockaddr *sa, *rti_info[RTAX_MAX];
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u_char *p, *lim;
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sa = (struct sockaddr *)(rtm + 1);
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get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
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sa = rti_info[RTAX_NETMASK];
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p = (u_char *)(&SIN6(sa)->sin6_addr);
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lim = (u_char *)sa + sa->sa_len;
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return prefixlen(p, lim);
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}
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int
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prefixlen(u_char *p, u_char *lim)
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{
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int masklen;
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for (masklen = 0; p < lim; p++) {
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switch (*p) {
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case 0xff:
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masklen += 8;
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break;
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case 0xfe:
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masklen += 7;
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break;
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case 0xfc:
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masklen += 6;
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break;
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case 0xf8:
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masklen += 5;
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break;
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case 0xf0:
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masklen += 4;
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break;
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case 0xe0:
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masklen += 3;
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break;
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case 0xc0:
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masklen += 2;
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break;
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case 0x80:
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masklen += 1;
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break;
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case 0x00:
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break;
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default:
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return(-1);
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}
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}
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return(masklen);
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}
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int
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rtmsg_type(char *buf)
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{
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struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
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return(rtm->rtm_type);
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}
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int
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rtmsg_len(char *buf)
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{
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struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
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return(rtm->rtm_msglen);
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}
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int
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ifmsg_len(char *buf)
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{
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struct if_msghdr *ifm = (struct if_msghdr *)buf;
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return(ifm->ifm_msglen);
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}
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/*
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* alloc buffer and get if_msghdrs block from kernel,
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* and put them into the buffer
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*/
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static void
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get_iflist(char **buf, size_t *size)
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{
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int mib[6];
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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] = 0;
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if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) {
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syslog(LOG_ERR, "<%s> sysctl: iflist size get failed",
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__func__);
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exit(1);
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}
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if ((*buf = malloc(*size)) == NULL) {
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syslog(LOG_ERR, "<%s> malloc failed", __func__);
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exit(1);
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}
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if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) {
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syslog(LOG_ERR, "<%s> sysctl: iflist get failed",
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__func__);
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exit(1);
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}
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return;
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}
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/*
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* alloc buffer and parse if_msghdrs block passed as arg,
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* and init the buffer as list of pointers ot each of the if_msghdr.
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*/
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static void
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parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize)
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{
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int iflentry_size, malloc_size;
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struct if_msghdr *ifm;
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struct ifa_msghdr *ifam;
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char *lim;
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/*
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* Estimate least size of an iflist entry, to be obtained from kernel.
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* Should add sizeof(sockaddr) ??
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*/
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iflentry_size = sizeof(struct if_msghdr);
|
|
/* roughly estimate max list size of pointers to each if_msghdr */
|
|
malloc_size = (bufsize/iflentry_size) * sizeof(size_t);
|
|
if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) {
|
|
syslog(LOG_ERR, "<%s> malloc failed", __func__);
|
|
exit(1);
|
|
}
|
|
|
|
lim = buf + bufsize;
|
|
for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) {
|
|
if (ifm->ifm_msglen == 0) {
|
|
syslog(LOG_WARNING, "<%s> ifm_msglen is 0 "
|
|
"(buf=%p lim=%p ifm=%p)", __func__,
|
|
buf, lim, ifm);
|
|
return;
|
|
}
|
|
|
|
if (ifm->ifm_type == RTM_IFINFO) {
|
|
(*ifmlist_p)[ifm->ifm_index] = ifm;
|
|
} else {
|
|
syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n"
|
|
"expected %d, got %d\n msglen = %d\n"
|
|
"buf:%p, ifm:%p, lim:%p\n",
|
|
RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen,
|
|
buf, ifm, lim);
|
|
exit (1);
|
|
}
|
|
for (ifam = (struct ifa_msghdr *)
|
|
((char *)ifm + ifm->ifm_msglen);
|
|
ifam < (struct ifa_msghdr *)lim;
|
|
ifam = (struct ifa_msghdr *)
|
|
((char *)ifam + ifam->ifam_msglen)) {
|
|
/* just for safety */
|
|
if (!ifam->ifam_msglen) {
|
|
syslog(LOG_WARNING, "<%s> ifa_msglen is 0 "
|
|
"(buf=%p lim=%p ifam=%p)", __func__,
|
|
buf, lim, ifam);
|
|
return;
|
|
}
|
|
if (ifam->ifam_type != RTM_NEWADDR)
|
|
break;
|
|
}
|
|
ifm = (struct if_msghdr *)ifam;
|
|
}
|
|
}
|
|
|
|
void
|
|
init_iflist()
|
|
{
|
|
if (ifblock) {
|
|
free(ifblock);
|
|
ifblock_size = 0;
|
|
}
|
|
if (iflist)
|
|
free(iflist);
|
|
/* get iflist block from kernel */
|
|
get_iflist(&ifblock, &ifblock_size);
|
|
|
|
/* make list of pointers to each if_msghdr */
|
|
parse_iflist(&iflist, ifblock, ifblock_size);
|
|
}
|