430 lines
11 KiB
C
430 lines
11 KiB
C
/* $NetBSD: routesock.c,v 1.2 2000/07/23 23:05:38 mycroft Exp $ */
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/*
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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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*/
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include "defs.h"
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#include <sys/socket.h>
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#include <net/route.h>
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#ifdef HAVE_ROUTING_SOCKETS
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#include <net/if_dl.h>
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#endif
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include "vif.h"
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#include "debug.h"
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#include "routesock.h"
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#ifdef HAVE_ROUTING_SOCKETS
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union sockunion
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{
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struct sockaddr sa;
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struct sockaddr_in6 sin6;
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struct sockaddr_dl sdl;
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} so_dst, so_ifp;
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typedef union sockunion *sup;
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int routing_socket;
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int rtm_addrs,
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pid;
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struct rt_metrics rt_metrics;
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u_long rtm_inits;
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/*
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* Local functions definitions.
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*/
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static int getmsg
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__P((register struct rt_msghdr *, int,
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struct rpfctl * rpfinfo));
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/*
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* TODO: check again!
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*/
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#ifdef IRIX
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#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) \
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: sizeof(__uint64_t))
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#else
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#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
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: sizeof(long))
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#endif /* IRIX */
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#ifdef HAVE_SA_LEN
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#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
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#else
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#define ADVANCE(x, n) (x += ROUNDUP(4)) /* TODO: a hack!! */
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#endif
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/* Open and initialize the routing socket */
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int
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init_routesock()
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{
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pid = getpid();
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routing_socket = socket(PF_ROUTE, SOCK_RAW, AF_INET6);
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if (routing_socket < 0)
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{
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log(LOG_ERR, 0, "\nRouting socket error");
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return -1;
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}
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if (fcntl(routing_socket, F_SETFL, O_NONBLOCK) == -1)
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{
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log(LOG_ERR, 0, "\n Routing socket error");
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return -1;
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}
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#if 0
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// TODO : UTILITY ?
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{
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int off;
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off = 0;
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if (setsockopt(routing_socket, SOL_SOCKET,
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SO_USELOOPBACK, (char *) &off,
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sizeof(off)) < 0)
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{
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log(LOG_ERR, 0, "\n setsockopt(SO_USELOOPBACK,0)");
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return -1;
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}
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}
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#endif
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return 0;
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}
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struct
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{
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struct rt_msghdr m_rtm;
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char m_space[512];
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} m_rtmsg;
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/* get the rpf neighbor info */
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int
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k_req_incoming(source, rpfp)
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struct sockaddr_in6 *source;
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struct rpfctl *rpfp;
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{
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int flags = RTF_STATIC;
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register sup su;
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static int seq;
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int rlen;
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register char *cp = m_rtmsg.m_space;
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register int l;
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struct rpfctl rpfinfo;
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/* TODO: a hack!!!! */
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#ifdef HAVE_SA_LEN
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#define NEXTADDR(w, u) \
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if (rtm_addrs & (w)) { \
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l = ROUNDUP(u.sa.sa_len); bcopy((char *)&(u), cp, l); cp += l;\
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}
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#else
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#define NEXTADDR(w, u) \
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if (rtm_addrs & (w)) { \
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l = ROUNDUP(4); bcopy((char *)&(u), cp, l); cp += l;\
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}
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#endif /* HAVE_SA_LEN */
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/* initialize */
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memset(&rpfp->rpfneighbor, 0, sizeof(rpfp->rpfneighbor));
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rpfp->source = *source;
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/*
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* check if local address or directly connected before calling the
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* routing socket
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*/
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if ((rpfp->iif = find_vif_direct_local(source)) != NO_VIF)
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{
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rpfp->rpfneighbor = *source;
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return (TRUE);
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}
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/* prepare the routing socket params */
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rtm_addrs |= RTA_DST;
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rtm_addrs |= RTA_IFP;
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su = &so_dst;
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su->sin6.sin6_family = AF_INET6;
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#ifdef HAVE_SA_LEN
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su->sin6.sin6_len = sizeof(struct sockaddr_in6);
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#endif
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su->sin6.sin6_addr = source->sin6_addr;
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su->sin6.sin6_scope_id = source->sin6_scope_id;
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so_ifp.sa.sa_family = AF_LINK;
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#ifdef HAVE_SA_LEN
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so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
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#endif
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flags |= RTF_UP;
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flags |= RTF_HOST;
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flags |= RTF_GATEWAY;
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errno = 0;
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bzero((char *) &m_rtmsg, sizeof(m_rtmsg));
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#define rtm m_rtmsg.m_rtm
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rtm.rtm_type = RTM_GET;
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rtm.rtm_flags = flags;
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rtm.rtm_version = RTM_VERSION;
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rtm.rtm_seq = ++seq;
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rtm.rtm_addrs = rtm_addrs;
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rtm.rtm_rmx = rt_metrics;
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rtm.rtm_inits = rtm_inits;
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NEXTADDR(RTA_DST, so_dst);
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NEXTADDR(RTA_IFP, so_ifp);
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rtm.rtm_msglen = l = cp - (char *) &m_rtmsg;
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if ((rlen = write(routing_socket, (char *) &m_rtmsg, l)) < 0)
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{
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IF_DEBUG(DEBUG_RPF | DEBUG_KERN)
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{
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if (errno == ESRCH)
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log(LOG_DEBUG, 0,
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"Writing to routing socket: no such route\n");
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else
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log(LOG_DEBUG, 0, "Error writing to routing socket");
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}
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return (FALSE);
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}
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do
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{
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l = read(routing_socket, (char *) &m_rtmsg, sizeof(m_rtmsg));
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} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
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if (l < 0)
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{
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IF_DEBUG(DEBUG_RPF | DEBUG_KERN)
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log(LOG_DEBUG, 0, "Read from routing socket failed: %s", strerror(errno));
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return (FALSE);
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}
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if (getmsg(&rtm, l, &rpfinfo))
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{
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rpfp->rpfneighbor = rpfinfo.rpfneighbor;
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rpfp->iif = rpfinfo.iif;
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}
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#undef rtm
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return (TRUE);
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}
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/*
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* Returns TRUE on success, FALSE otherwise. rpfinfo contains the result.
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*/
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int
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getmsg(rtm, msglen, rpfinfop)
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register struct rt_msghdr *rtm;
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int msglen;
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struct rpfctl *rpfinfop;
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{
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struct sockaddr *dst = NULL,
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*gate = NULL,
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*mask = NULL;
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struct sockaddr_dl *ifp = NULL;
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register struct sockaddr *sa;
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register char *cp;
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register int i;
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struct sockaddr_in6 *sin6;
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vifi_t vifi;
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struct uvif *v;
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char in6txt[INET6_ADDRSTRLEN];
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if (rpfinfop == (struct rpfctl *) NULL)
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return (FALSE);
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sin6 = (struct sockaddr_in6 *) & so_dst;
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IF_DEBUG(DEBUG_RPF)
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log(LOG_DEBUG, 0, "route to: %s",
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inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
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cp = ((char *) (rtm + 1));
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if (rtm->rtm_addrs)
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for (i = 1; i; i <<= 1)
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if (i & rtm->rtm_addrs)
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{
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sa = (struct sockaddr *) cp;
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switch (i)
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{
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case RTA_DST:
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dst = sa;
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break;
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case RTA_GATEWAY:
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gate = sa;
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break;
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case RTA_NETMASK:
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mask = sa;
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break;
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case RTA_IFP:
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if (sa->sa_family == AF_LINK &&
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((struct sockaddr_dl *) sa)->sdl_nlen)
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ifp = (struct sockaddr_dl *) sa;
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break;
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#if 0
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default:
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/*
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* There are some defined flags other than above 4,
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* but we are not interested in them.
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*/
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log(LOG_WARNING, 0,
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"Routesock.c (getmsg) unknown flag : %d",i);
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#endif
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}
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ADVANCE(cp, sa);
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}
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if (!ifp)
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{ /* No incoming interface */
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IF_DEBUG(DEBUG_RPF)
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log(LOG_DEBUG, 0,
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"No incoming interface for destination %s",
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inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
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return (FALSE);
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}
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if (dst && mask)
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mask->sa_family = dst->sa_family;
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if (dst)
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{
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sin6 = (struct sockaddr_in6 *) dst;
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IF_DEBUG(DEBUG_RPF)
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log(LOG_DEBUG, 0, " destination is: %s",
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inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
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}
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if (gate && rtm->rtm_flags & RTF_GATEWAY)
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{
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sin6 = (struct sockaddr_in6 *) gate;
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IF_DEBUG(DEBUG_RPF)
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log(LOG_DEBUG, 0, " gateway is: %s",
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inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
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rpfinfop->rpfneighbor = *sin6;
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if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
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{
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#if 0
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rpfinfop->rpfneighbor.sin6_scope_id =
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ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
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#endif
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rpfinfop->rpfneighbor.sin6_scope_id = ifp->sdl_index;
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/*
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* XXX: KAME kernel embeds the interface index to the address.
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* Clear the index for safety.
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*/
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rpfinfop->rpfneighbor.sin6_addr.s6_addr[2] = 0;
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rpfinfop->rpfneighbor.sin6_addr.s6_addr[3] = 0;
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}
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}
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for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v)
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/* get the number of the interface by matching the name */
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if ((strlen(v->uv_name) == ifp->sdl_nlen) &&
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!(strncmp(v->uv_name,ifp->sdl_data,ifp->sdl_nlen)))
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break;
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IF_DEBUG(DEBUG_RPF)
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log(LOG_DEBUG, 0, " iif is %d", vifi);
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rpfinfop->iif = vifi;
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if (vifi >= numvifs)
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{
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IF_DEBUG(DEBUG_RPF)
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log(LOG_DEBUG, 0,
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"Invalid incoming interface for destination %s, because of invalid virtual interface",
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inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
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return (FALSE); /* invalid iif */
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}
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return (TRUE);
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}
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#else /* HAVE_ROUTING_SOCKETS */
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/*
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* Return in rpfcinfo the incoming interface and the next hop router toward
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* source.
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*/
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/* TODO: check whether next hop router address is in network or host order */
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int
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k_req_incoming(source, rpfcinfo)
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struct sockaddr_in6 *source;
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struct rpfctl *rpfcinfo;
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{
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rpfcinfo->source = *source;
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rpfcinfo->iif = NO_VIF; /* just initialized, will be */
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/* changed in kernel */
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memset(&rpfcinfo->rpfneighbor, 0, sizeof(rpfcinfo->rpfneighbor)); /* initialized */
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if (ioctl(udp_socket, SIOCGETRPF, (char *) rpfcinfo) < 0)
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{
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log(LOG_ERR, errno, "ioctl SIOCGETRPF k_req_incoming");
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return (FALSE);
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}
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return (TRUE);
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}
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#endif /* HAVE_ROUTING_SOCKETS */
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