OpenBSD-4.6/usr.sbin/rtsold/if.c
/* $OpenBSD: if.c,v 1.24 2009/06/12 09:50:16 chl Exp $ */
/* $KAME: if.c,v 1.18 2002/05/31 10:10:03 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.
*/
#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_types.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <netinet6/in6_var.h>
#include <err.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 <netdb.h>
#include "rtsold.h"
extern int rssock;
static int ifsock;
static int get_llflag(const char *);
int
ifinit(void)
{
ifsock = rssock;
return(0);
}
int
interface_up(char *name)
{
struct ifreq ifr;
int llflag;
strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (ioctl(ifsock, SIOCGIFXFLAGS, (caddr_t)&ifr) < 0)
warn("SIOCGIFXFLAGS");
ifr.ifr_flags &= ~IFXF_NOINET6;
if (ioctl(ifsock, SIOCSIFXFLAGS, (caddr_t)&ifr) < 0)
warn("SIOCSIFXFLAGS");
strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
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);
}
warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
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 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)
{
struct ifaddrs *ifap, *ifa;
struct sockaddr_dl *sdl;
if (getifaddrs(&ifap) != 0)
return (NULL);
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (strcmp(ifa->ifa_name, name) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
sdl = malloc(ifa->ifa_addr->sa_len);
if (!sdl)
continue; /*XXX*/
memcpy(sdl, ifa->ifa_addr, ifa->ifa_addr->sa_len);
freeifaddrs(ifap);
return (sdl);
}
freeifaddrs(ifap);
return (NULL);
}
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;
}