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freebsd/usr.sbin/rtsold/if.c
Hiroki Sato db82af41db - Implement RDNSS and DNSSL options (RFC 6106, IPv6 Router Advertisement
Options for DNS Configuration) into rtadvd(8) and rtsold(8).  DNS
  information received by rtsold(8) will go to resolv.conf(5) by
  resolvconf(8) script.  This is based on work by J.R. Oldroyd (kern/156259)
  but revised extensively[1].

- rtadvd(8) now supports "noifprefix" to disable gathering on-link prefixes
  from interfaces when no "addr" is specified[2].  An entry in rtadvd.conf
  with "noifprefix" + no "addr" generates an RA message with no prefix
  information option.

- rtadvd(8) now supports RTM_IFANNOUNCE message to fix crashes when an
  interface is added or removed.

- Correct bogus ND_OPT_ROUTE_INFO value to one in RFC 4191.

Reviewed by:	bz[1]
PR:		kern/156259 [1]
PR:		bin/152458 [2]
2011-06-06 03:06:43 +00:00

437 lines
10 KiB
C

/* $KAME: if.c,v 1.27 2003/10/05 00:09:36 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <ifaddrs.h>
#include "rtsold.h"
extern int rssock;
static int ifsock;
static int get_llflag(const char *);
static void get_rtaddrs(int, struct sockaddr *, struct sockaddr **);
int
ifinit(void)
{
ifsock = rssock;
return(0);
}
int
interface_up(char *name)
{
struct ifreq ifr;
struct in6_ndireq nd;
int llflag;
int s;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
memset(&nd, 0, sizeof(nd));
strlcpy(nd.ifname, name, sizeof(nd.ifname));
if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
strerror(errno));
return (-1);
}
if (!(ifr.ifr_flags & IFF_UP)) {
ifr.ifr_flags |= IFF_UP;
if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
warnmsg(LOG_ERR, __func__,
"ioctl(SIOCSIFFLAGS): %s", strerror(errno));
return (-1);
}
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
warnmsg(LOG_WARNING, __func__, "socket(AF_INET6, SOCK_DGRAM): %s",
strerror(errno));
return (-1);
}
if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFINFO_IN6): %s",
strerror(errno));
close(s);
return (-1);
}
warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
if (nd.ndi.flags & ND6_IFF_IFDISABLED) {
if (Fflag) {
nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
warnmsg(LOG_WARNING, __func__,
"ioctl(SIOCSIFINFO_IN6): %s",
strerror(errno));
close(s);
return (-1);
}
} else {
warnmsg(LOG_WARNING, __func__,
"%s is disabled.", name);
close(s);
return (-1);
}
}
if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) {
if (Fflag) {
nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
warnmsg(LOG_WARNING, __func__,
"ioctl(SIOCSIFINFO_IN6): %s",
strerror(errno));
close(s);
return (-1);
}
} else {
warnmsg(LOG_WARNING, __func__,
"%s does not accept Router Advertisement.", name);
close(s);
return (-1);
}
}
close(s);
llflag = get_llflag(name);
if (llflag < 0) {
warnmsg(LOG_WARNING, __func__,
"get_llflag() failed, anyway I'll try");
return (0);
}
if (!(llflag & IN6_IFF_NOTREADY)) {
warnmsg(LOG_DEBUG, __func__, "%s is ready", name);
return (0);
} else {
if (llflag & IN6_IFF_TENTATIVE) {
warnmsg(LOG_DEBUG, __func__, "%s is tentative",
name);
return (IFS_TENTATIVE);
}
if (llflag & IN6_IFF_DUPLICATED)
warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
name);
return (-1);
}
}
int
interface_status(struct ifinfo *ifinfo)
{
char *ifname = ifinfo->ifname;
struct ifreq ifr;
struct ifmediareq ifmr;
/* get interface flags */
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
ifname, strerror(errno));
return (-1);
}
/*
* if one of UP and RUNNING flags is dropped,
* the interface is not active.
*/
if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
goto inactive;
/* Next, check carrier on the interface, if possible */
if (!ifinfo->mediareqok)
goto active;
memset(&ifmr, 0, sizeof(ifmr));
strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
if (errno != EINVAL) {
warnmsg(LOG_DEBUG, __func__,
"ioctl(SIOCGIFMEDIA) on %s: %s",
ifname, strerror(errno));
return(-1);
}
/*
* EINVAL simply means that the interface does not support
* the SIOCGIFMEDIA ioctl. We regard it alive.
*/
ifinfo->mediareqok = 0;
goto active;
}
if (ifmr.ifm_status & IFM_AVALID) {
switch (ifmr.ifm_active & IFM_NMASK) {
case IFM_ETHER:
case IFM_IEEE80211:
if (ifmr.ifm_status & IFM_ACTIVE)
goto active;
else
goto inactive;
break;
default:
goto inactive;
}
}
inactive:
return (0);
active:
return (1);
}
#define ROUNDUP(a, size) \
(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
sizeof(u_long)) : sizeof(u_long)))
#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
int
lladdropt_length(struct sockaddr_dl *sdl)
{
switch (sdl->sdl_type) {
case IFT_ETHER:
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
return (ROUNDUP8(ETHER_ADDR_LEN + 2));
default:
return (0);
}
}
void
lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
{
char *addr;
ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
switch (sdl->sdl_type) {
case IFT_ETHER:
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
addr = (char *)(ndopt + 1);
memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
break;
default:
warnmsg(LOG_ERR, __func__,
"unsupported link type(%d)", sdl->sdl_type);
exit(1);
}
return;
}
struct sockaddr_dl *
if_nametosdl(char *name)
{
int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
char *buf, *next, *lim;
size_t len;
struct if_msghdr *ifm;
struct sockaddr *sa, *rti_info[RTAX_MAX];
struct sockaddr_dl *sdl = NULL, *ret_sdl;
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
return(NULL);
if ((buf = malloc(len)) == NULL)
return(NULL);
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
free(buf);
return (NULL);
}
lim = buf + len;
for (next = buf; next < lim; next += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)next;
if (ifm->ifm_type == RTM_IFINFO) {
sa = (struct sockaddr *)(ifm + 1);
get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
if ((sa = rti_info[RTAX_IFP]) != NULL) {
if (sa->sa_family == AF_LINK) {
sdl = (struct sockaddr_dl *)sa;
if (strlen(name) != sdl->sdl_nlen)
continue; /* not same len */
if (strncmp(&sdl->sdl_data[0],
name,
sdl->sdl_nlen) == 0) {
break;
}
}
}
}
}
if (next == lim) {
/* search failed */
free(buf);
return (NULL);
}
if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) {
free(buf);
return (NULL);
}
memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
free(buf);
return (ret_sdl);
}
int
getinet6sysctl(int code)
{
int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
int value;
size_t size;
mib[3] = code;
size = sizeof(value);
if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
return (-1);
else
return (value);
}
int
setinet6sysctl(int code, int newval)
{
int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
int value;
size_t size;
mib[3] = code;
size = sizeof(value);
if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size,
&newval, sizeof(newval)) < 0)
return (-1);
else
return (value);
}
/*------------------------------------------------------------*/
/* get ia6_flags for link-local addr on if. returns -1 on error. */
static int
get_llflag(const char *name)
{
struct ifaddrs *ifap, *ifa;
struct in6_ifreq ifr6;
struct sockaddr_in6 *sin6;
int s;
if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
strerror(errno));
exit(1);
}
if (getifaddrs(&ifap) != 0) {
warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
strerror(errno));
exit(1);
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (strlen(ifa->ifa_name) != strlen(name) ||
strncmp(ifa->ifa_name, name, strlen(name)) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
continue;
memset(&ifr6, 0, sizeof(ifr6));
strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
warnmsg(LOG_ERR, __func__,
"ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
exit(1);
}
freeifaddrs(ifap);
close(s);
return (ifr6.ifr_ifru.ifru_flags6);
}
freeifaddrs(ifap);
close(s);
return (-1);
}
static void
get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
{
int i;
for (i = 0; i < RTAX_MAX; i++) {
if (addrs & (1 << i)) {
rti_info[i] = sa;
NEXT_SA(sa);
} else
rti_info[i] = NULL;
}
}