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