NetBSD/usr.sbin/pim6sd/config.c

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/* $NetBSD: config.c,v 1.3 2000/05/19 10:43:47 itojun Exp $ */
/*
* Copyright (c) 1998 by the University of Southern California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation in source and binary forms for lawful
* purposes and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both
* the copyright notice and this permission notice appear in supporting
* documentation, and that any documentation, advertising materials,
* and other materials related to such distribution and use acknowledge
* that the software was developed by the University of Southern
* California and/or Information Sciences Institute.
* The name of the University of Southern California may not
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
* NON-INFRINGEMENT.
*
* IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Other copyrights might apply to parts of this software and are so
* noted when applicable.
*/
/*
* Questions concerning this software should be directed to
* Mickael Hoerdt (hoerdt@clarinet.u-strasbg.fr) LSIIT Strasbourg.
*
*/
/*
* This program has been derived from pim6dd.
* The pim6dd program is covered by the license in the accompanying file
* named "LICENSE.pim6dd".
*/
/*
* This program has been derived from pimd.
* The pimd program is covered by the license in the accompanying file
* named "LICENSE.pimd".
*
*/
/*
* Part of this program has been derived from mrouted.
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE.mrouted".
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*
*/
#include <sys/ioctl.h>
#include <syslog.h>
#include <stdlib.h>
#include "vif.h"
#include "pim6.h"
#include "inet6.h"
#include "rp.h"
#include "pimd.h"
#include "timer.h"
#include "route.h"
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <net/if_var.h>
#endif
#include <netinet6/in6_var.h>
#ifdef HAVE_GETIFADDRS
#include <ifaddrs.h>
#endif
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "config.h"
#include <arpa/inet.h>
#include <stdio.h>
#include "debug.h"
void add_phaddr(struct uvif *v, struct sockaddr_in6 *addr,
struct in6_addr *mask);
void
config_vifs_from_kernel()
{
register struct uvif *v;
register vifi_t vifi;
int i;
struct sockaddr_in6 addr;
struct in6_addr mask;
short flags;
#ifdef HAVE_GETIFADDRS
struct ifaddrs *ifap, *ifa;
#else
int n;
int num_ifreq = 64;
struct ifconf ifc;
struct ifreq *ifrp,*ifend;
#endif
total_interfaces= 0; /* The total number of physical interfaces */
#ifdef HAVE_GETIFADDRS
if (getifaddrs(&ifap))
log(LOG_ERR, errno, "getifaddrs");
/*
* Loop through all of the interfaces.
*/
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
struct in6_ifreq ifr6;
/*
* Ignore any interface for an address family other than IPv6.
*/
if (ifa->ifa_addr->sa_family != AF_INET6) {
/* Eventually may have IPv6 address later */
total_interfaces++;
continue;
}
memcpy(&addr, ifa->ifa_addr, sizeof(struct sockaddr_in6));
flags = ifa->ifa_flags;
/*
* Get netmask of the address.
*/
memcpy(&mask,
&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr,
sizeof(mask));
/*
* Get IPv6 specific flags, and ignore an anycast address.
* XXX: how about a deprecated, tentative, duplicated or
* detached address?
*/
memcpy(ifr6.ifr_name, ifa->ifa_name, sizeof(ifr6.ifr_name));
ifr6.ifr_addr = *(struct sockaddr_in6 *)ifa->ifa_addr;
if (ioctl(udp_socket, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
log(LOG_ERR, errno, "ioctl SIOCGIFAFLAG_IN6 for %s",
inet6_fmt(&ifr6.ifr_addr.sin6_addr));
}
else {
if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_ANYCAST) {
log(LOG_DEBUG, 0, "config_vifs_from_kernel: "
"%s on %s is an anycast address, ignored",
inet6_fmt(&ifr6.ifr_addr.sin6_addr),
ifa->ifa_name);
continue;
}
}
if (IN6_IS_ADDR_LINKLOCAL(&addr.sin6_addr))
{
addr.sin6_scope_id = if_nametoindex(ifa->ifa_name);
#ifdef __KAME__
/*
* Hack for KAME kernel.
* Set sin6_scope_id field of a link local address and clear
* the index embedded in the address.
*/
/* clear interface index */
addr.sin6_addr.s6_addr[2] = 0;
addr.sin6_addr.s6_addr[3] = 0;
#endif
}
/*
* If the address is connected to the same subnet as one
* already installed in the uvifs array, just add the address
* to the list of addresses of the uvif.
*/
for(vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v)
{
if(strcmp(v->uv_name, ifa->ifa_name) == 0 )
{
add_phaddr(v, &addr, &mask);
break;
}
}
if (vifi != numvifs)
continue;
/*
* If there is room in the uvifs array, install this interface.
*/
if (numvifs == MAXMIFS)
{
log(LOG_WARNING, 0,
"too many vifs, ignoring %s", ifa->ifa_name);
continue;
}
/*
* Everyone below is a potential vif interface.
* We don't care if it has wrong configuration or not
* configured at all.
*/
total_interfaces++;
v = &uvifs[numvifs];
v->uv_dst_addr = allpim6routers_group;
v->uv_subnetmask = mask;
strncpy(v->uv_name, ifa->ifa_name, IFNAMSIZ);
v->uv_ifindex = if_nametoindex(v->uv_name);
add_phaddr(v, &addr,&mask);
/* prefix local calc. (and what about add_phaddr?...) */
for (i = 0; i < sizeof(struct in6_addr); i++)
v->uv_prefix.sin6_addr.s6_addr[i] =
addr.sin6_addr.s6_addr[i] & mask.s6_addr[i];
if(flags & IFF_POINTOPOINT)
v->uv_flags |=(VIFF_REXMIT_PRUNES | VIFF_POINT_TO_POINT);
/*
* Disable multicast routing on loopback interfaces and
* interfaces that do not support multicast. But they are
* still necessary, since global addresses maybe assigned only
* on such interfaces.
*/
if ((flags & IFF_LOOPBACK) != 0 ||
(flags & IFF_MULTICAST) == 0)
v->uv_flags |= VIFF_DISABLED;
IF_DEBUG(DEBUG_IF)
log(LOG_DEBUG,0,
"Installing %s (%s on subnet %s) ,"
"as vif #%u - rate = %d",
v->uv_name,inet6_fmt(&addr.sin6_addr),
net6name(&v->uv_prefix.sin6_addr,&mask),
numvifs,v->uv_rate_limit);
++numvifs;
if( !(flags & IFF_UP))
{
v->uv_flags |= VIFF_DOWN;
vifs_down = TRUE;
}
}
freeifaddrs(ifap);
#else /* !HAVE_GETIFADDRS */
ifc.ifc_len = num_ifreq * sizeof (struct ifreq);
ifc.ifc_buf = calloc(ifc.ifc_len,sizeof(char));
while (ifc.ifc_buf) {
caddr_t newbuf;
if (ioctl(udp_socket,SIOCGIFCONF,(char *)&ifc) <0)
log(LOG_ERR, errno, "ioctl SIOCGIFCONF");
/*
* If the buffer was large enough to hold all the addresses
* then break out, otherwise increase the buffer size and
* try again.
*
* The only way to know that we definitely had enough space
* is to know that there was enough space for at least one
* more struct ifreq. ???
*/
if( (num_ifreq * sizeof (struct ifreq)) >=
ifc.ifc_len + sizeof(struct ifreq))
break;
num_ifreq *= 2;
ifc.ifc_len = num_ifreq * sizeof(struct ifreq);
newbuf = realloc(ifc.ifc_buf, ifc.ifc_len);
if (newbuf == NULL)
free(ifc.ifc_buf);
ifc.ifc_buf = newbuf;
}
if (ifc.ifc_buf == NULL)
log(LOG_ERR, 0, "config_vifs_from_kernel: ran out of memory");
ifrp = (struct ifreq *) ifc.ifc_buf;
ifend = (struct ifreq * ) (ifc.ifc_buf + ifc.ifc_len);
/*
* Loop through all of the interfaces.
*/
for(;ifrp < ifend;ifrp = (struct ifreq *)((char *)ifrp+n))
{
struct ifreq ifr;
struct in6_ifreq ifr6;
#ifdef HAVE_SA_LEN
n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
if(n < sizeof(*ifrp))
n=sizeof(*ifrp);
#else
n=sizeof(*ifrp);
#endif
/*
* Ignore any interface for an address family other than IPv6.
*/
if ( ifrp->ifr_addr.sa_family != AF_INET6)
{
/* Eventually may have IP address later */
total_interfaces++;
continue;
}
memcpy(&addr,&ifrp->ifr_addr,sizeof(struct sockaddr_in6));
/*
* Need a template to preserve address info that is
* used below to locate the next entry. (Otherwise,
* SIOCGIFFLAGS stomps over it because the requests
* are returned in a union.)
*/
memcpy(ifr.ifr_name,ifrp->ifr_name,sizeof(ifr.ifr_name));
memcpy(ifr6.ifr_name,ifrp->ifr_name,sizeof(ifr6.ifr_name));
if(ioctl(udp_socket,SIOCGIFFLAGS,(char *)&ifr) <0)
log(LOG_ERR, errno, "ioctl SIOCGIFFLAGS for %s", ifr.ifr_name);
flags = ifr.ifr_flags;
#if 0
/*
* Ignore loopback interfaces and interfaces that do not
* support multicast.
*/
if((flags & (IFF_LOOPBACK | IFF_MULTICAST ))!= IFF_MULTICAST)
continue;
#endif
/*
* Get netmask of the address.
*/
ifr6.ifr_addr = *(struct sockaddr_in6 *)&ifrp->ifr_addr;
if(ioctl(udp_socket, SIOCGIFNETMASK_IN6, (char *)&ifr6) <0)
log(LOG_ERR, errno, "ioctl SIOCGIFNETMASK_IN6 for %s",
inet6_fmt(&ifr6.ifr_addr.sin6_addr));
memcpy(&mask,&ifr6.ifr_addr.sin6_addr,sizeof(mask));
/*
* Get IPv6 specific flags, and ignore an anycast address.
* XXX: how about a deprecated, tentative, duplicated or
* detached address?
*/
ifr6.ifr_addr = *(struct sockaddr_in6 *)&ifrp->ifr_addr;
if (ioctl(udp_socket, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
log(LOG_ERR, errno, "ioctl SIOCGIFAFLAG_IN6 for %s",
inet6_fmt(&ifr6.ifr_addr.sin6_addr));
}
else {
if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_ANYCAST) {
log(LOG_DEBUG, 0, "config_vifs_from_kernel: "
"%s on %s is an anycast address, ignored",
inet6_fmt(&ifr6.ifr_addr.sin6_addr),
ifr.ifr_name);
continue;
}
}
if (IN6_IS_ADDR_LINKLOCAL(&addr.sin6_addr))
{
addr.sin6_scope_id = if_nametoindex(ifrp->ifr_name);
#ifdef __KAME__
/*
* Hack for KAME kernel.
* Set sin6_scope_id field of a link local address and clear
* the index embedded in the address.
*/
/* clear interface index */
addr.sin6_addr.s6_addr[2] = 0;
addr.sin6_addr.s6_addr[3] = 0;
#endif
}
/*
* If the address is connected to the same subnet as one
* already installed in the uvifs array, just add the address
* to the list of addresses of the uvif.
*/
for(vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v)
{
if( strcmp(v->uv_name , ifr.ifr_name) == 0 )
{
add_phaddr(v, &addr,&mask);
break;
}
}
if( vifi != numvifs )
continue;
/*
* If there is room in the uvifs array, install this interface.
*/
if( numvifs == MAXMIFS )
{
log(LOG_WARNING, 0,
"too many vifs, ignoring %s", ifr.ifr_name);
continue;
}
/*
* Everyone below is a potential vif interface.
* We don't care if it has wrong configuration or not
* configured at all.
*/
total_interfaces++;
v = &uvifs[numvifs];
v->uv_dst_addr = allpim6routers_group;
v->uv_subnetmask = mask;
strncpy ( v->uv_name , ifr.ifr_name,IFNAMSIZ);
v->uv_ifindex = if_nametoindex(v->uv_name);
add_phaddr(v,&addr,&mask);
/* prefix local calc. (and what about add_phaddr?...) */
for (i = 0; i < sizeof(struct in6_addr); i++)
v->uv_prefix.sin6_addr.s6_addr[i] =
addr.sin6_addr.s6_addr[i] & mask.s6_addr[i];
if(flags & IFF_POINTOPOINT)
v->uv_flags |=(VIFF_REXMIT_PRUNES | VIFF_POINT_TO_POINT);
/*
* Disable multicast routing on loopback interfaces and
* interfaces that do not support multicast. But they are
* still necessary, since global addresses maybe assigned only
* on such interfaces.
*/
if ((flags & IFF_LOOPBACK) != 0 || (flags & IFF_MULTICAST) == 0)
v->uv_flags |= VIFF_DISABLED;
IF_DEBUG(DEBUG_IF)
log(LOG_DEBUG,0,
"Installing %s (%s on subnet %s) ,"
"as vif #%u - rate = %d",
v->uv_name,inet6_fmt(&addr.sin6_addr),
net6name(&v->uv_prefix.sin6_addr,&mask),
numvifs,v->uv_rate_limit);
++numvifs;
if( !(flags & IFF_UP))
{
v->uv_flags |= VIFF_DOWN;
vifs_down = TRUE;
}
}
#endif /* HAVE_GETIFADDRS */
}
void
add_phaddr(struct uvif *v,struct sockaddr_in6 *addr,struct in6_addr *mask)
{
struct phaddr *pa;
int i;
if( (pa=malloc(sizeof(*pa))) == NULL)
log(LOG_ERR, 0, "add_phaddr: memory exhausted");
memset(pa,0,sizeof(*pa));
pa->pa_addr= *addr;
pa->pa_subnetmask = *mask;
for(i = 0; i < sizeof(struct in6_addr); i++)
pa->pa_prefix.sin6_addr.s6_addr[i] =
addr->sin6_addr.s6_addr[i] & mask->s6_addr[i];
pa->pa_prefix.sin6_scope_id = addr->sin6_scope_id;
if(IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
if(v->uv_linklocal)
log(LOG_WARNING, 0,
"add_phaddr: found more than one link-local "
"address on %s",
v->uv_name);
v->uv_linklocal = pa;
}
pa->pa_next = v->uv_addrs;
v->uv_addrs = pa;
}