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NetBSD/usr.sbin/pim6sd/routesock.c

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/* $NetBSD: routesock.c,v 1.3 2000/12/04 07:09:36 itojun Exp $ */
/* $KAME: routesock.c,v 1.10 2000/12/04 06:45:31 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/param.h>
#include <sys/file.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include "defs.h"
#include <sys/socket.h>
#include <net/route.h>
#include <netinet/ip_mroute.h>
#include <netinet6/ip6_mroute.h>
#ifdef HAVE_ROUTING_SOCKETS
#include <net/if_dl.h>
#endif
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <stdio.h>
#include "vif.h"
#include "debug.h"
#include "routesock.h"
#ifdef HAVE_ROUTING_SOCKETS
union sockunion
{
struct sockaddr sa;
struct sockaddr_in6 sin6;
struct sockaddr_dl sdl;
} so_dst, so_ifp;
typedef union sockunion *sup;
int routing_socket;
int rtm_addrs,
pid;
struct rt_metrics rt_metrics;
u_long rtm_inits;
/*
* Local functions definitions.
*/
static int getmsg
__P((register struct rt_msghdr *, int,
struct rpfctl * rpfinfo));
/*
* TODO: check again!
*/
#ifdef IRIX
#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) \
: sizeof(__uint64_t))
#else
#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
: sizeof(long))
#endif /* IRIX */
#ifdef HAVE_SA_LEN
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
#else
#define ADVANCE(x, n) (x += ROUNDUP(4)) /* TODO: a hack!! */
#endif
/* Open and initialize the routing socket */
int
init_routesock()
{
pid = getpid();
routing_socket = socket(PF_ROUTE, SOCK_RAW, AF_INET6);
if (routing_socket < 0)
{
log(LOG_ERR, 0, "\nRouting socket error");
return -1;
}
if (fcntl(routing_socket, F_SETFL, O_NONBLOCK) == -1)
{
log(LOG_ERR, 0, "\n Routing socket error");
return -1;
}
#if 0
// TODO : UTILITY ?
{
int off;
off = 0;
if (setsockopt(routing_socket, SOL_SOCKET,
SO_USELOOPBACK, (char *) &off,
sizeof(off)) < 0)
{
log(LOG_ERR, 0, "\n setsockopt(SO_USELOOPBACK,0)");
return -1;
}
}
#endif
return 0;
}
struct
{
struct rt_msghdr m_rtm;
char m_space[512];
} m_rtmsg;
/* get the rpf neighbor info */
int
k_req_incoming(source, rpfp)
struct sockaddr_in6 *source;
struct rpfctl *rpfp;
{
int flags = RTF_STATIC;
register sup su;
static int seq;
int rlen;
register char *cp = m_rtmsg.m_space;
register int l;
struct rpfctl rpfinfo;
/* TODO: a hack!!!! */
#ifdef HAVE_SA_LEN
#define NEXTADDR(w, u) \
if (rtm_addrs & (w)) { \
l = ROUNDUP(u.sa.sa_len); bcopy((char *)&(u), cp, l); cp += l;\
}
#else
#define NEXTADDR(w, u) \
if (rtm_addrs & (w)) { \
l = ROUNDUP(4); bcopy((char *)&(u), cp, l); cp += l;\
}
#endif /* HAVE_SA_LEN */
/* initialize */
memset(&rpfp->rpfneighbor, 0, sizeof(rpfp->rpfneighbor));
rpfp->source = *source;
/*
* check if local address or directly connected before calling the
* routing socket
*/
if ((rpfp->iif = find_vif_direct_local(source)) != NO_VIF)
{
rpfp->rpfneighbor = *source;
return (TRUE);
}
/* prepare the routing socket params */
rtm_addrs |= RTA_DST;
rtm_addrs |= RTA_IFP;
su = &so_dst;
su->sin6.sin6_family = AF_INET6;
#ifdef HAVE_SA_LEN
su->sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
su->sin6.sin6_addr = source->sin6_addr;
su->sin6.sin6_scope_id = source->sin6_scope_id;
so_ifp.sa.sa_family = AF_LINK;
#ifdef HAVE_SA_LEN
so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
#endif
flags |= RTF_UP;
flags |= RTF_HOST;
flags |= RTF_GATEWAY;
errno = 0;
bzero((char *) &m_rtmsg, sizeof(m_rtmsg));
#define rtm m_rtmsg.m_rtm
rtm.rtm_type = RTM_GET;
rtm.rtm_flags = flags;
rtm.rtm_version = RTM_VERSION;
rtm.rtm_seq = ++seq;
rtm.rtm_addrs = rtm_addrs;
rtm.rtm_rmx = rt_metrics;
rtm.rtm_inits = rtm_inits;
NEXTADDR(RTA_DST, so_dst);
NEXTADDR(RTA_IFP, so_ifp);
rtm.rtm_msglen = l = cp - (char *) &m_rtmsg;
if ((rlen = write(routing_socket, (char *) &m_rtmsg, l)) < 0)
{
IF_DEBUG(DEBUG_RPF | DEBUG_KERN)
{
if (errno == ESRCH)
log(LOG_DEBUG, 0,
"Writing to routing socket: no such route\n");
else
log(LOG_DEBUG, 0, "Error writing to routing socket");
}
return (FALSE);
}
do
{
l = read(routing_socket, (char *) &m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
if (l < 0)
{
IF_DEBUG(DEBUG_RPF | DEBUG_KERN)
log(LOG_DEBUG, 0, "Read from routing socket failed: %s", strerror(errno));
return (FALSE);
}
if (getmsg(&rtm, l, &rpfinfo))
{
rpfp->rpfneighbor = rpfinfo.rpfneighbor;
rpfp->iif = rpfinfo.iif;
}
#undef rtm
return (TRUE);
}
/*
* Returns TRUE on success, FALSE otherwise. rpfinfo contains the result.
*/
int
getmsg(rtm, msglen, rpfinfop)
register struct rt_msghdr *rtm;
int msglen;
struct rpfctl *rpfinfop;
{
struct sockaddr *dst = NULL,
*gate = NULL,
*mask = NULL;
struct sockaddr_dl *ifp = NULL;
register struct sockaddr *sa;
register char *cp;
register int i;
struct sockaddr_in6 *sin6;
vifi_t vifi;
struct uvif *v;
char in6txt[INET6_ADDRSTRLEN];
if (rpfinfop == (struct rpfctl *) NULL)
return (FALSE);
sin6 = (struct sockaddr_in6 *) & so_dst;
IF_DEBUG(DEBUG_RPF)
log(LOG_DEBUG, 0, "route to: %s",
inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
cp = ((char *) (rtm + 1));
if (rtm->rtm_addrs)
for (i = 1; i; i <<= 1)
if (i & rtm->rtm_addrs)
{
sa = (struct sockaddr *) cp;
switch (i)
{
case RTA_DST:
dst = sa;
break;
case RTA_GATEWAY:
gate = sa;
break;
case RTA_NETMASK:
mask = sa;
break;
case RTA_IFP:
if (sa->sa_family == AF_LINK &&
((struct sockaddr_dl *) sa)->sdl_nlen)
ifp = (struct sockaddr_dl *) sa;
break;
#if 0
default:
/*
* There are some defined flags other than above 4,
* but we are not interested in them.
*/
log(LOG_WARNING, 0,
"Routesock.c (getmsg) unknown flag : %d",i);
#endif
}
ADVANCE(cp, sa);
}
if (!ifp)
{ /* No incoming interface */
IF_DEBUG(DEBUG_RPF)
log(LOG_DEBUG, 0,
"No incoming interface for destination %s",
inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
return (FALSE);
}
if (dst && mask)
mask->sa_family = dst->sa_family;
if (dst)
{
sin6 = (struct sockaddr_in6 *) dst;
IF_DEBUG(DEBUG_RPF)
log(LOG_DEBUG, 0, " destination is: %s",
inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
}
if (gate && rtm->rtm_flags & RTF_GATEWAY)
{
sin6 = (struct sockaddr_in6 *) gate;
IF_DEBUG(DEBUG_RPF)
log(LOG_DEBUG, 0, " gateway is: %s",
inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
rpfinfop->rpfneighbor = *sin6;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
{
#if 0
rpfinfop->rpfneighbor.sin6_scope_id =
ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
#endif
rpfinfop->rpfneighbor.sin6_scope_id = ifp->sdl_index;
/*
* XXX: KAME kernel embeds the interface index to the address.
* Clear the index for safety.
*/
rpfinfop->rpfneighbor.sin6_addr.s6_addr[2] = 0;
rpfinfop->rpfneighbor.sin6_addr.s6_addr[3] = 0;
}
}
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v)
/* get the number of the interface by matching the name */
if ((strlen(v->uv_name) == ifp->sdl_nlen) &&
!(strncmp(v->uv_name,ifp->sdl_data,ifp->sdl_nlen)))
break;
IF_DEBUG(DEBUG_RPF)
log(LOG_DEBUG, 0, " iif is %d", vifi);
rpfinfop->iif = vifi;
if (vifi >= numvifs)
{
IF_DEBUG(DEBUG_RPF)
log(LOG_DEBUG, 0,
"Invalid incoming interface for destination %s, because of invalid virtual interface",
inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
return (FALSE); /* invalid iif */
}
return (TRUE);
}
#else /* HAVE_ROUTING_SOCKETS */
/*
* Return in rpfcinfo the incoming interface and the next hop router toward
* source.
*/
/* TODO: check whether next hop router address is in network or host order */
int
k_req_incoming(source, rpfcinfo)
struct sockaddr_in6 *source;
struct rpfctl *rpfcinfo;
{
rpfcinfo->source = *source;
rpfcinfo->iif = NO_VIF; /* just initialized, will be */
/* changed in kernel */
memset(&rpfcinfo->rpfneighbor, 0, sizeof(rpfcinfo->rpfneighbor)); /* initialized */
if (ioctl(udp_socket, SIOCGETRPF, (char *) rpfcinfo) < 0)
{
log(LOG_ERR, errno, "ioctl SIOCGETRPF k_req_incoming");
return (FALSE);
}
return (TRUE);
}
#endif /* HAVE_ROUTING_SOCKETS */
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