547 lines
17 KiB
C
547 lines
17 KiB
C
/*
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* Copyright (C) 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may 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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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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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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* Pavlin Ivanov Radoslavov (pavlin@catarina.usc.edu)
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*
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* $Id: mld6.c,v 1.13 2000/04/12 07:34:38 jinmei Exp $
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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 "defs.h"
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#include <sys/uio.h>
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/*
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* Exported variables.
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*/
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char *mld6_recv_buf; /* input packet buffer */
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char *mld6_send_buf; /* output packet buffer */
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int mld6_socket; /* socket for all network I/O */
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struct sockaddr_in6 allrouters_group = {sizeof(struct sockaddr_in6), AF_INET6};
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struct sockaddr_in6 allnodes_group = {sizeof(struct sockaddr_in6), AF_INET6};
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/* Extenals */
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extern struct in6_addr in6addr_linklocal_allnodes;
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/* local variables. */
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static struct sockaddr_in6 dst = {sizeof(dst), AF_INET6};
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static struct msghdr sndmh,
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rcvmh;
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static struct iovec sndiov[2];
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static struct iovec rcviov[2];
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static struct sockaddr_in6 from;
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static u_char *rcvcmsgbuf = NULL;
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static int rcvcmsglen;
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#ifndef USE_RFC2292BIS
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u_int8_t raopt[IP6OPT_RTALERT_LEN];
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#endif
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static char *sndcmsgbuf;
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static int ctlbuflen = 0;
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static u_short rtalert_code;
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/* local functions */
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static void mld6_read __P((int i, fd_set * fds));
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static void accept_mld6 __P((int len));
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static void make_mld6_msg __P((int, int, struct sockaddr_in6 *,
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struct sockaddr_in6 *, struct in6_addr *, int, int, int, int));
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#ifndef IP6OPT_ROUTER_ALERT /* XXX to be compatible older systems */
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#define IP6OPT_ROUTER_ALERT IP6OPT_RTALERT
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#endif
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/*
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* Open and initialize the MLD socket.
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*/
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void
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init_mld6()
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{
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struct icmp6_filter filt;
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int on;
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rtalert_code = htons(IP6OPT_RTALERT_MLD);
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if (!mld6_recv_buf && (mld6_recv_buf = malloc(RECV_BUF_SIZE)) == NULL)
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log(LOG_ERR, 0, "malloc failed");
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if (!mld6_send_buf && (mld6_send_buf = malloc(RECV_BUF_SIZE)) == NULL)
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log(LOG_ERR, 0, "malloc failed");
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rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
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CMSG_SPACE(sizeof(int));
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if (rcvcmsgbuf == NULL && (rcvcmsgbuf = malloc(rcvcmsglen)) == NULL)
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log(LOG_ERR, 0,"malloc failed");
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IF_DEBUG(DEBUG_KERN)
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log(LOG_DEBUG,0,"%d octets allocated for the emit/recept buffer mld6",RECV_BUF_SIZE);
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if ((mld6_socket = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
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log(LOG_ERR, errno, "MLD6 socket");
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k_set_rcvbuf(mld6_socket, SO_RECV_BUF_SIZE_MAX,
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SO_RECV_BUF_SIZE_MIN); /* lots of input buffering */
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k_set_hlim(mld6_socket, MINHLIM); /* restrict multicasts to one hop */
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k_set_loop(mld6_socket, FALSE); /* disable multicast loopback */
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/* address initialization */
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allnodes_group.sin6_addr = in6addr_linklocal_allnodes;
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if (inet_pton(AF_INET6, "ff02::2",
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(void *) &allrouters_group.sin6_addr) != 1)
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log(LOG_ERR, 0, "inet_pton failed for ff02::2");
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/* filter all non-MLD ICMP messages */
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ICMP6_FILTER_SETBLOCKALL(&filt);
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ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
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ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
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ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
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ICMP6_FILTER_SETPASS(MLD6_MTRACE_RESP, &filt);
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ICMP6_FILTER_SETPASS(MLD6_MTRACE, &filt);
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if (setsockopt(mld6_socket, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
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sizeof(filt)) < 0)
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log(LOG_ERR, errno, "setsockopt(ICMP6_FILTER)");
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/* specify to tell receiving interface */
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on = 1;
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#ifdef IPV6_RECVPKTINFO
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if (setsockopt(mld6_socket, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
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sizeof(on)) < 0)
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log(LOG_ERR, errno, "setsockopt(IPV6_RECVPKTINFO)");
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#else /* old adv. API */
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if (setsockopt(mld6_socket, IPPROTO_IPV6, IPV6_PKTINFO, &on,
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sizeof(on)) < 0)
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log(LOG_ERR, errno, "setsockopt(IPV6_PKTINFO)");
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#endif
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on = 1;
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/* specify to tell value of hoplimit field of received IP6 hdr */
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#ifdef IPV6_RECVHOPLIMIT
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if (setsockopt(mld6_socket, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
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sizeof(on)) < 0)
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log(LOG_ERR, errno, "setsockopt(IPV6_RECVHOPLIMIT)");
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#else /* old adv. API */
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if (setsockopt(mld6_socket, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
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sizeof(on)) < 0)
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log(LOG_ERR, errno, "setsockopt(IPV6_HOPLIMIT)");
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#endif
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/* initialize msghdr for receiving packets */
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rcviov[0].iov_base = (caddr_t) mld6_recv_buf;
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rcviov[0].iov_len = RECV_BUF_SIZE;
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rcvmh.msg_name = (caddr_t) & from;
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rcvmh.msg_namelen = sizeof(from);
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rcvmh.msg_iov = rcviov;
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rcvmh.msg_iovlen = 1;
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rcvmh.msg_control = (caddr_t) rcvcmsgbuf;
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rcvmh.msg_controllen = rcvcmsglen;
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/* initialize msghdr for sending packets */
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sndiov[0].iov_base = (caddr_t)mld6_send_buf;
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sndmh.msg_namelen = sizeof(struct sockaddr_in6);
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sndmh.msg_iov = sndiov;
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sndmh.msg_iovlen = 1;
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/* specifiy to insert router alert option in a hop-by-hop opt hdr. */
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#ifndef USE_RFC2292BIS
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raopt[0] = IP6OPT_ROUTER_ALERT;
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raopt[1] = IP6OPT_RTALERT_LEN - 2;
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memcpy(&raopt[2], (caddr_t) & rtalert_code, sizeof(u_short));
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#endif
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/* register MLD message handler */
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if (register_input_handler(mld6_socket, mld6_read) < 0)
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log(LOG_ERR, 0,
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"Couldn't register mld6_read as an input handler");
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}
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/* Read an MLD message */
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static void
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mld6_read(i, rfd)
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int i;
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fd_set *rfd;
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{
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register int mld6_recvlen;
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mld6_recvlen = recvmsg(mld6_socket, &rcvmh, 0);
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if (mld6_recvlen < 0)
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{
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if (errno != EINTR)
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log(LOG_ERR, errno, "MLD6 recvmsg");
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return;
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}
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/* TODO: make it as a thread in the future releases */
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accept_mld6(mld6_recvlen);
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}
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/*
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* Process a newly received MLD6 packet that is sitting in the input packet
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* buffer.
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*/
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static void
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accept_mld6(recvlen)
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int recvlen;
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{
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struct in6_addr *group, *dst = NULL;
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struct mld6_hdr *mldh;
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struct cmsghdr *cm;
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struct in6_pktinfo *pi = NULL;
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int *hlimp = NULL;
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int ifindex = 0;
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struct sockaddr_in6 *src = (struct sockaddr_in6 *) rcvmh.msg_name;
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if (recvlen < sizeof(struct mld6_hdr))
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{
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log(LOG_WARNING, 0,
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"received packet too short (%u bytes) for MLD header",
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recvlen);
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return;
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}
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mldh = (struct mld6_hdr *) rcvmh.msg_iov[0].iov_base;
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/*
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* Packets sent up from kernel to daemon have ICMPv6 type = 0.
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* Note that we set filters on the mld6_socket, so we should never
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* see a "normal" ICMPv6 packet with type 0 of ICMPv6 type.
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*/
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if (mldh->mld6_type == 0) {
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/* XXX: msg_controllen must be reset in this case. */
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rcvmh.msg_controllen = rcvcmsglen;
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process_kernel_call();
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return;
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}
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group = &mldh->mld6_addr;
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/* extract optional information via Advanced API */
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for (cm = (struct cmsghdr *) CMSG_FIRSTHDR(&rcvmh);
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cm;
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cm = (struct cmsghdr *) CMSG_NXTHDR(&rcvmh, cm))
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{
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if (cm->cmsg_level == IPPROTO_IPV6 &&
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cm->cmsg_type == IPV6_PKTINFO &&
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cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo)))
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{
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pi = (struct in6_pktinfo *) (CMSG_DATA(cm));
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ifindex = pi->ipi6_ifindex;
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dst = &pi->ipi6_addr;
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}
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if (cm->cmsg_level == IPPROTO_IPV6 &&
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cm->cmsg_type == IPV6_HOPLIMIT &&
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cm->cmsg_len == CMSG_LEN(sizeof(int)))
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hlimp = (int *) CMSG_DATA(cm);
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}
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if (hlimp == NULL)
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{
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log(LOG_WARNING, 0,
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"failed to get receiving hop limit");
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return;
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}
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/* TODO: too noisy. Remove it? */
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//#define NOSUCHDEF
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#ifdef NOSUCHDEF
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IF_DEBUG(DEBUG_PKT | debug_kind(IPPROTO_ICMPV6, mldh->mld6_type,
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mldh->mld6_code))
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log(LOG_DEBUG, 0, "RECV %s from %s to %s",
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packet_kind(IPPROTO_ICMPV6,
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mldh->mld6_type, mldh->mld6_code),
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inet6_fmt(&src->sin6_addr), inet6_fmt(dst));
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#endif /* NOSUCHDEF */
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/* for an mtrace message, we don't need strict checks */
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if (mldh->mld6_type == MLD6_MTRACE) {
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accept_mtrace(src, dst, group, ifindex, (char *)(mldh + 1),
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mldh->mld6_code, recvlen - sizeof(struct mld6_hdr));
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return;
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}
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/* hop limit check */
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if (*hlimp != 1)
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{
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log(LOG_WARNING, 0,
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"received an MLD6 message with illegal hop limit(%d) from %s",
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*hlimp, inet6_fmt(&src->sin6_addr));
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/* but accept the packet */
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}
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if (ifindex == 0)
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{
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log(LOG_WARNING, 0, "failed to get receiving interface");
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return;
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}
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/* scope check */
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if (IN6_IS_ADDR_MC_NODELOCAL(&mldh->mld6_addr))
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{
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log(LOG_INFO, 0,
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"RECV %s with an invalid scope: %s from %s",
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inet6_fmt(&mldh->mld6_addr),
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inet6_fmt(&src->sin6_addr));
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return; /* discard */
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}
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/* source address check */
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if (!IN6_IS_ADDR_LINKLOCAL(&src->sin6_addr))
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{
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log(LOG_INFO, 0,
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"RECV %s from a non link local address: %s",
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packet_kind(IPPROTO_ICMPV6, mldh->mld6_type,
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mldh->mld6_code),
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inet6_fmt(&src->sin6_addr));
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return;
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}
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switch (mldh->mld6_type)
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{
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case MLD6_LISTENER_QUERY:
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accept_listener_query(src, dst, group,
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ntohs(mldh->mld6_maxdelay));
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return;
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case MLD6_LISTENER_REPORT:
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accept_listener_report(src, dst, group);
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return;
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case MLD6_LISTENER_DONE:
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accept_listener_done(src, dst, group);
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return;
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default:
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/* This must be impossible since we set a type filter */
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log(LOG_INFO, 0,
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"ignoring unknown ICMPV6 message type %x from %s to %s",
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mldh->mld6_type, inet6_fmt(&src->sin6_addr),
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inet6_fmt(dst));
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return;
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}
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}
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static void
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make_mld6_msg(type, code, src, dst, group, ifindex, delay, datalen, alert)
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int type, code, ifindex, delay, datalen, alert;
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struct sockaddr_in6 *src, *dst;
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struct in6_addr *group;
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{
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static struct sockaddr_in6 dst_sa = {sizeof(dst_sa), AF_INET6};
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struct mld6_hdr *mhp = (struct mld6_hdr *)mld6_send_buf;
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int ctllen, hbhlen = 0;
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switch(type) {
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case MLD6_MTRACE:
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case MLD6_MTRACE_RESP:
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sndmh.msg_name = (caddr_t)dst;
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break;
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default:
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if (IN6_IS_ADDR_UNSPECIFIED(group))
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dst_sa.sin6_addr = allnodes_group.sin6_addr;
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else
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dst_sa.sin6_addr = *group;
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sndmh.msg_name = (caddr_t)&dst_sa;
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datalen = sizeof(struct mld6_hdr);
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break;
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}
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bzero(mhp, sizeof(*mhp));
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mhp->mld6_type = type;
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mhp->mld6_code = code;
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mhp->mld6_maxdelay = htons(delay);
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mhp->mld6_addr = *group;
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sndiov[0].iov_len = datalen;
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/* estimate total ancillary data length */
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ctllen = 0;
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if (ifindex != -1 || src)
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ctllen += CMSG_SPACE(sizeof(struct in6_pktinfo));
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if (alert) {
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#ifdef USE_RFC2292BIS
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if ((hbhlen = inet6_opt_init(NULL, 0)) == -1)
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log(LOG_ERR, 0, "inet6_opt_init(0) failed");
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if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2,
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2, NULL)) == -1)
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log(LOG_ERR, 0, "inet6_opt_append(0) failed");
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if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1)
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log(LOG_ERR, 0, "inet6_opt_finish(0) failed");
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ctllen += CMSG_SPACE(hbhlen);
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#else /* old advanced API */
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hbhlen = inet6_option_space(sizeof(raopt));
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ctllen += hbhlen;
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#endif
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}
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/* extend ancillary data space (if necessary) */
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if (ctlbuflen < ctllen) {
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if (sndcmsgbuf)
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free(sndcmsgbuf);
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if ((sndcmsgbuf = malloc(ctllen)) == NULL)
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log(LOG_ERR, 0, "make_mld6_msg: malloc failed"); /* assert */
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ctlbuflen = ctllen;
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}
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/* store ancillary data */
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if ((sndmh.msg_controllen = ctllen) > 0) {
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struct cmsghdr *cmsgp;
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sndmh.msg_control = sndcmsgbuf;
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cmsgp = CMSG_FIRSTHDR(&sndmh);
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if (ifindex != -1 || src) {
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struct in6_pktinfo *pktinfo;
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|
|
|
cmsgp->cmsg_len = CMSG_SPACE(sizeof(struct in6_pktinfo));
|
|
cmsgp->cmsg_level = IPPROTO_IPV6;
|
|
cmsgp->cmsg_type = IPV6_PKTINFO;
|
|
pktinfo = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
|
|
memset((caddr_t)pktinfo, 0, sizeof(*pktinfo));
|
|
if (ifindex != -1)
|
|
pktinfo->ipi6_ifindex = ifindex;
|
|
if (src)
|
|
pktinfo->ipi6_addr = src->sin6_addr;
|
|
cmsgp = CMSG_NXTHDR(&sndmh, cmsgp);
|
|
}
|
|
if (alert) {
|
|
#ifdef USE_RFC2292BIS
|
|
int currentlen;
|
|
void *hbhbuf, *optp = NULL;
|
|
|
|
cmsgp->cmsg_len = CMSG_SPACE(hbhlen);
|
|
cmsgp->cmsg_level = IPPROTO_IPV6;
|
|
cmsgp->cmsg_type = IPV6_HOPOPTS;
|
|
hbhbuf = CMSG_DATA(cmsgp);
|
|
|
|
if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1)
|
|
log(LOG_ERR, 0, "inet6_opt_init(len = %d) failed",
|
|
hbhlen);
|
|
if ((currentlen = inet6_opt_append(hbhbuf, hbhlen,
|
|
currentlen,
|
|
IP6OPT_ROUTER_ALERT, 2,
|
|
2, &optp)) == -1)
|
|
log(LOG_ERR, 0,
|
|
"inet6_opt_append(len = %d) failed",
|
|
currentlen, hbhlen);
|
|
(void)inet6_opt_set_val(optp, 0, &rtalert_code,
|
|
sizeof(rtalert_code));
|
|
if (inet6_opt_finish(hbhbuf, hbhlen, currentlen) == -1)
|
|
log(LOG_ERR, 0, "inet6_opt_finish(buf) failed");
|
|
#else /* old advanced API */
|
|
if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
|
|
log(LOG_ERR, 0, /* assert */
|
|
"make_mld6_msg: inet6_option_init failed");
|
|
if (inet6_option_append(cmsgp, raopt, 4, 0))
|
|
log(LOG_ERR, 0, /* assert */
|
|
"make_mld6_msg: inet6_option_append failed");
|
|
#endif
|
|
cmsgp = CMSG_NXTHDR(&sndmh, cmsgp);
|
|
}
|
|
}
|
|
else
|
|
sndmh.msg_control = NULL; /* clear for safety */
|
|
}
|
|
|
|
void
|
|
send_mld6(type, code, src, dst, group, index, delay, datalen, alert)
|
|
int type;
|
|
int code; /* for trace packets only */
|
|
struct sockaddr_in6 *src;
|
|
struct sockaddr_in6 *dst; /* may be NULL */
|
|
struct in6_addr *group;
|
|
int index, delay, alert;
|
|
int datalen; /* for trace packets only */
|
|
{
|
|
int setloop = 0;
|
|
struct sockaddr_in6 *dstp;
|
|
|
|
make_mld6_msg(type, code, src, dst, group, index, delay, datalen, alert);
|
|
dstp = (struct sockaddr_in6 *)sndmh.msg_name;
|
|
if (IN6_ARE_ADDR_EQUAL(&dstp->sin6_addr, &allnodes_group.sin6_addr)) {
|
|
setloop = 1;
|
|
k_set_loop(mld6_socket, TRUE);
|
|
}
|
|
if (sendmsg(mld6_socket, &sndmh, 0) < 0) {
|
|
if (errno == ENETDOWN)
|
|
check_vif_state();
|
|
else
|
|
log(log_level(IPPROTO_ICMPV6, type, 0), errno,
|
|
"sendmsg to %s with src %s on %s",
|
|
inet6_fmt(&dstp->sin6_addr),
|
|
src ? inet6_fmt(&src->sin6_addr) : "(unspec)",
|
|
ifindex2str(index));
|
|
|
|
if (setloop)
|
|
k_set_loop(mld6_socket, FALSE);
|
|
return;
|
|
}
|
|
|
|
IF_DEBUG(DEBUG_PKT|debug_kind(IPPROTO_IGMP, type, 0))
|
|
log(LOG_DEBUG, 0, "SENT %s from %-15s to %s",
|
|
packet_kind(IPPROTO_ICMPV6, type, 0),
|
|
src ? inet6_fmt(&src->sin6_addr) : "unspec",
|
|
inet6_fmt(&dstp->sin6_addr));
|
|
}
|