mld6.c revision 96116
166458Sdfr/* $FreeBSD: head/sys/netinet6/mld6.c 96116 2002-05-06 16:28:25Z ume $ */ 266458Sdfr/* $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $ */ 366458Sdfr 466458Sdfr/* 566458Sdfr * Copyright (C) 1998 WIDE Project. 666458Sdfr * All rights reserved. 766458Sdfr * 866458Sdfr * Redistribution and use in source and binary forms, with or without 966458Sdfr * modification, are permitted provided that the following conditions 1066458Sdfr * are met: 1166458Sdfr * 1. Redistributions of source code must retain the above copyright 1266458Sdfr * notice, this list of conditions and the following disclaimer. 1366458Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1466458Sdfr * notice, this list of conditions and the following disclaimer in the 1566458Sdfr * documentation and/or other materials provided with the distribution. 1666458Sdfr * 3. Neither the name of the project nor the names of its contributors 1766458Sdfr * may be used to endorse or promote products derived from this software 1866458Sdfr * without specific prior written permission. 1966458Sdfr * 2066458Sdfr * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2166458Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2266458Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2366458Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2466458Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2566458Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2666458Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2766458Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2866458Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2966458Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3066458Sdfr * SUCH DAMAGE. 3166458Sdfr */ 3266458Sdfr 3366458Sdfr/* 3466458Sdfr * Copyright (c) 1988 Stephen Deering. 3566458Sdfr * Copyright (c) 1992, 1993 3666458Sdfr * The Regents of the University of California. All rights reserved. 3766458Sdfr * 3866458Sdfr * This code is derived from software contributed to Berkeley by 3966458Sdfr * Stephen Deering of Stanford University. 4066458Sdfr * 4166458Sdfr * Redistribution and use in source and binary forms, with or without 4266458Sdfr * modification, are permitted provided that the following conditions 4366458Sdfr * are met: 4466458Sdfr * 1. Redistributions of source code must retain the above copyright 4566458Sdfr * notice, this list of conditions and the following disclaimer. 4666458Sdfr * 2. Redistributions in binary form must reproduce the above copyright 4766458Sdfr * notice, this list of conditions and the following disclaimer in the 4866458Sdfr * documentation and/or other materials provided with the distribution. 4966458Sdfr * 3. All advertising materials mentioning features or use of this software 5066458Sdfr * must display the following acknowledgement: 5166458Sdfr * This product includes software developed by the University of 5266458Sdfr * California, Berkeley and its contributors. 5366458Sdfr * 4. Neither the name of the University nor the names of its contributors 5466458Sdfr * may be used to endorse or promote products derived from this software 5566458Sdfr * without specific prior written permission. 5666458Sdfr * 5766458Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 5866458Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 5966458Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 6066458Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 6166458Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 6266458Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 6366458Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 6466458Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 6566458Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 6666458Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6766458Sdfr * SUCH DAMAGE. 6866458Sdfr * 6966458Sdfr * @(#)igmp.c 8.1 (Berkeley) 7/19/93 7066458Sdfr */ 7166458Sdfr 7266458Sdfr#include "opt_inet.h" 7366458Sdfr#include "opt_inet6.h" 7466458Sdfr 7566458Sdfr#include <sys/param.h> 7666458Sdfr#include <sys/systm.h> 7766458Sdfr#include <sys/mbuf.h> 7866458Sdfr#include <sys/socket.h> 7966458Sdfr#include <sys/protosw.h> 8066458Sdfr#include <sys/syslog.h> 8166458Sdfr 8266458Sdfr#include <net/if.h> 8366458Sdfr 8466458Sdfr#include <netinet/in.h> 8566458Sdfr#include <netinet/in_var.h> 8666458Sdfr#include <netinet/ip6.h> 8766458Sdfr#include <netinet6/ip6_var.h> 8866458Sdfr#include <netinet/icmp6.h> 8966458Sdfr#include <netinet6/mld6_var.h> 9066458Sdfr 9166458Sdfr#include <net/net_osdep.h> 9266458Sdfr 9366458Sdfr/* 9466458Sdfr * Protocol constants 9566458Sdfr */ 9666458Sdfr 9777448Sjhb/* denotes that the MLD max response delay field specifies time in milliseconds */ 9877448Sjhb#define MLD6_TIMER_SCALE 1000 9977448Sjhb/* 10077448Sjhb * time between repetitions of a node's initial report of interest in a 10177448Sjhb * multicast address(in seconds) 10277448Sjhb */ 10377448Sjhb#define MLD6_UNSOLICITED_REPORT_INTERVAL 10 10477448Sjhb 10566458Sdfrstatic struct ip6_pktopts ip6_opts; 10666458Sdfrstatic int mld6_timers_are_running; 10766458Sdfr/* XXX: These are necessary for KAME's link-local hack */ 10866458Sdfrstatic struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 10966458Sdfrstatic struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 11066458Sdfr 11166458Sdfrstatic void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *)); 11266458Sdfr 11366458Sdfrvoid 11466458Sdfrmld6_init() 11566458Sdfr{ 11666458Sdfr static u_int8_t hbh_buf[8]; 11766458Sdfr struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; 11866458Sdfr u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); 11966458Sdfr 12066458Sdfr mld6_timers_are_running = 0; 12166458Sdfr 12266458Sdfr /* ip6h_nxt will be fill in later */ 12367017Sdfr hbh->ip6h_len = 0; /* (8 >> 3) - 1 */ 12467017Sdfr 12566458Sdfr /* XXX: grotty hard coding... */ 12666458Sdfr hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ 12766458Sdfr hbh_buf[3] = 0; 12866458Sdfr hbh_buf[4] = IP6OPT_RTALERT; 12966458Sdfr hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; 13066458Sdfr bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); 13166458Sdfr 13266458Sdfr init_ip6pktopts(&ip6_opts); 13366458Sdfr ip6_opts.ip6po_hbh = hbh; 13466458Sdfr} 13566458Sdfr 13666458Sdfrvoid 13766458Sdfrmld6_start_listening(in6m) 13866458Sdfr struct in6_multi *in6m; 13966458Sdfr{ 14066458Sdfr int s = splnet(); 14166458Sdfr 14266458Sdfr /* 14366458Sdfr * RFC2710 page 10: 14466458Sdfr * The node never sends a Report or Done for the link-scope all-nodes 14566458Sdfr * address. 14666458Sdfr * MLD messages are never sent for multicast addresses whose scope is 0 14766458Sdfr * (reserved) or 1 (node-local). 14866458Sdfr */ 14966458Sdfr mld6_all_nodes_linklocal.s6_addr16[1] = 15066458Sdfr htons(in6m->in6m_ifp->if_index); /* XXX */ 15166458Sdfr if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) || 15266458Sdfr IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) { 15366458Sdfr in6m->in6m_timer = 0; 15466458Sdfr in6m->in6m_state = MLD6_OTHERLISTENER; 15566458Sdfr } else { 15666458Sdfr mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 15766458Sdfr in6m->in6m_timer = MLD6_RANDOM_DELAY( 15866458Sdfr MLD6_UNSOLICITED_REPORT_INTERVAL * PR_FASTHZ); 15966458Sdfr in6m->in6m_state = MLD6_IREPORTEDLAST; 16066458Sdfr mld6_timers_are_running = 1; 16166458Sdfr } 16266458Sdfr splx(s); 16366458Sdfr} 16466458Sdfr 16566458Sdfrvoid 16666458Sdfrmld6_stop_listening(in6m) 16766458Sdfr struct in6_multi *in6m; 16866458Sdfr{ 16966458Sdfr mld6_all_nodes_linklocal.s6_addr16[1] = 17066458Sdfr htons(in6m->in6m_ifp->if_index); /* XXX */ 17166458Sdfr mld6_all_routers_linklocal.s6_addr16[1] = 17266458Sdfr htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */ 17366458Sdfr 17466458Sdfr if (in6m->in6m_state == MLD6_IREPORTEDLAST && 17566458Sdfr (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) && 17666458Sdfr IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL) 17766458Sdfr mld6_sendpkt(in6m, MLD_LISTENER_DONE, 17866458Sdfr &mld6_all_routers_linklocal); 17966458Sdfr} 18066458Sdfr 18166458Sdfrvoid 18266458Sdfrmld6_input(m, off) 18366458Sdfr struct mbuf *m; 18466458Sdfr int off; 18566458Sdfr{ 18666458Sdfr struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 18766458Sdfr struct mld_hdr *mldh; 18866458Sdfr struct ifnet *ifp = m->m_pkthdr.rcvif; 18966458Sdfr struct in6_multi *in6m; 19066458Sdfr struct in6_ifaddr *ia; 19166458Sdfr struct ifmultiaddr *ifma; 19266458Sdfr int timer; /* timer value in the MLD query header */ 19366458Sdfr 19466458Sdfr#ifndef PULLDOWN_TEST 19566458Sdfr IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),); 19666458Sdfr mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off); 19766458Sdfr#else 19866458Sdfr IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); 19966458Sdfr if (mldh == NULL) { 20066458Sdfr icmp6stat.icp6s_tooshort++; 20166458Sdfr return; 20266458Sdfr } 20366458Sdfr#endif 20466458Sdfr 20566937Sdfr /* source address validation */ 20666458Sdfr ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */ 20766937Sdfr if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { 20866937Sdfr log(LOG_ERR, 20966937Sdfr "mld6_input: src %s is not link-local (grp=%s)\n", 21066937Sdfr ip6_sprintf(&ip6->ip6_src), 21166937Sdfr ip6_sprintf(&mldh->mld_addr)); 21266458Sdfr /* 21366458Sdfr * spec (RFC2710) does not explicitly 21466937Sdfr * specify to discard the packet from a non link-local 21566937Sdfr * source address. But we believe it's expected to do so. 21666937Sdfr * XXX: do we have to allow :: as source? 21766937Sdfr */ 21866937Sdfr m_freem(m); 21966937Sdfr return; 22066458Sdfr } 22166458Sdfr 22266458Sdfr /* 22366458Sdfr * In the MLD6 specification, there are 3 states and a flag. 22466458Sdfr * 22583366Sjulian * In Non-Listener state, we simply don't have a membership record. 22666458Sdfr * In Delaying Listener state, our timer is running (in6m->in6m_timer) 22766458Sdfr * In Idle Listener state, our timer is not running (in6m->in6m_timer==0) 22866458Sdfr * 22966458Sdfr * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if 23066458Sdfr * we have heard a report from another member, or MLD6_IREPORTEDLAST 23166458Sdfr * if we sent the last report. 23266458Sdfr */ 23366458Sdfr switch(mldh->mld_type) { 23466458Sdfr case MLD_LISTENER_QUERY: 23566458Sdfr if (ifp->if_flags & IFF_LOOPBACK) 23666458Sdfr break; 23766458Sdfr 23866458Sdfr if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) && 23966458Sdfr !IN6_IS_ADDR_MULTICAST(&mldh->mld_addr)) 24066458Sdfr break; /* print error or log stat? */ 24166458Sdfr if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr)) 24266458Sdfr mldh->mld_addr.s6_addr16[1] = 24366458Sdfr htons(ifp->if_index); /* XXX */ 24466458Sdfr 24566458Sdfr /* 24666458Sdfr * - Start the timers in all of our membership records 24766458Sdfr * that the query applies to for the interface on 24866458Sdfr * which the query arrived excl. those that belong 24966458Sdfr * to the "all-nodes" group (ff02::1). 25066458Sdfr * - Restart any timer that is already running but has 25166458Sdfr * A value longer than the requested timeout. 25266458Sdfr * - Use the value specified in the query message as 25366458Sdfr * the maximum timeout. 25466458Sdfr */ 25566458Sdfr IFP_TO_IA6(ifp, ia); 25666458Sdfr if (ia == NULL) 25766458Sdfr break; 25866458Sdfr 25966458Sdfr /* 26066458Sdfr * XXX: System timer resolution is too low to handle Max 26166458Sdfr * Response Delay, so set 1 to the internal timer even if 26266458Sdfr * the calculated value equals to zero when Max Response 26366458Sdfr * Delay is positive. 26466458Sdfr */ 26566458Sdfr timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE; 26666458Sdfr if (timer == 0 && mldh->mld_maxdelay) 26766458Sdfr timer = 1; 26866458Sdfr mld6_all_nodes_linklocal.s6_addr16[1] = 26966458Sdfr htons(ifp->if_index); /* XXX */ 27066458Sdfr 27166458Sdfr TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 27266458Sdfr { 27366458Sdfr if (ifma->ifma_addr->sa_family != AF_INET6) 27466458Sdfr continue; 27566937Sdfr in6m = (struct in6_multi *)ifma->ifma_protospec; 27666937Sdfr if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, 27766937Sdfr &mld6_all_nodes_linklocal) || 27866458Sdfr IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 27966937Sdfr IPV6_ADDR_SCOPE_LINKLOCAL) 28066458Sdfr continue; 28166458Sdfr 28266458Sdfr if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) || 28366458Sdfr IN6_ARE_ADDR_EQUAL(&mldh->mld_addr, 28466458Sdfr &in6m->in6m_addr)) 28566458Sdfr { 28666458Sdfr if (timer == 0) { 28766458Sdfr /* send a report immediately */ 28866458Sdfr mld6_sendpkt(in6m, MLD_LISTENER_REPORT, 28966458Sdfr NULL); 29066458Sdfr in6m->in6m_timer = 0; /* reset timer */ 29166458Sdfr in6m->in6m_state = MLD6_IREPORTEDLAST; 29266458Sdfr } 29366458Sdfr else if (in6m->in6m_timer == 0 || /*idle state*/ 29466458Sdfr in6m->in6m_timer > timer) { 29566458Sdfr in6m->in6m_timer = 29666458Sdfr MLD6_RANDOM_DELAY(timer); 29766458Sdfr mld6_timers_are_running = 1; 29866458Sdfr } 29966937Sdfr } 30066458Sdfr } 30166458Sdfr 30266458Sdfr if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr)) 30366458Sdfr mldh->mld_addr.s6_addr16[1] = 0; /* XXX */ 30466458Sdfr break; 30566458Sdfr case MLD_LISTENER_REPORT: 30666458Sdfr /* 30766458Sdfr * For fast leave to work, we have to know that we are the 30866458Sdfr * last person to send a report for this group. Reports 30966458Sdfr * can potentially get looped back if we are a multicast 31066458Sdfr * router, so discard reports sourced by me. 31166458Sdfr * Note that it is impossible to check IFF_LOOPBACK flag of 31266458Sdfr * ifp for this purpose, since ip6_mloopback pass the physical 31366458Sdfr * interface to looutput. 31466458Sdfr */ 31566458Sdfr if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 31666458Sdfr break; 31766458Sdfr 31867017Sdfr if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr)) 31966458Sdfr break; 32066458Sdfr 32166458Sdfr if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr)) 32266458Sdfr mldh->mld_addr.s6_addr16[1] = 32383366Sjulian htons(ifp->if_index); /* XXX */ 32466458Sdfr /* 32566458Sdfr * If we belong to the group being reported, stop 32666458Sdfr * our timer for that group. 32766458Sdfr */ 32866458Sdfr IN6_LOOKUP_MULTI(mldh->mld_addr, ifp, in6m); 32966458Sdfr if (in6m) { 33066458Sdfr in6m->in6m_timer = 0; /* transit to idle state */ 33166458Sdfr in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */ 33266458Sdfr } 33366458Sdfr 33466458Sdfr if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr)) 33566458Sdfr mldh->mld_addr.s6_addr16[1] = 0; /* XXX */ 33666458Sdfr break; 33766458Sdfr default: /* this is impossible */ 33866458Sdfr log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type); 33966458Sdfr break; 34066458Sdfr } 34166458Sdfr 34266458Sdfr m_freem(m); 34366458Sdfr} 34466458Sdfr 34566458Sdfrvoid 34666458Sdfrmld6_fasttimeo() 34766458Sdfr{ 34866458Sdfr struct in6_multi *in6m; 34966458Sdfr struct in6_multistep step; 35066458Sdfr int s; 35166458Sdfr 35266458Sdfr /* 35366458Sdfr * Quick check to see if any work needs to be done, in order 35466458Sdfr * to minimize the overhead of fasttimo processing. 35566458Sdfr */ 35666458Sdfr if (!mld6_timers_are_running) 35766458Sdfr return; 35866458Sdfr 35966458Sdfr s = splnet(); 36066458Sdfr mld6_timers_are_running = 0; 36166458Sdfr IN6_FIRST_MULTI(step, in6m); 36266458Sdfr while (in6m != NULL) { 36366458Sdfr if (in6m->in6m_timer == 0) { 36466458Sdfr /* do nothing */ 36566458Sdfr } else if (--in6m->in6m_timer == 0) { 36666458Sdfr mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 36766458Sdfr in6m->in6m_state = MLD6_IREPORTEDLAST; 36866458Sdfr } else { 36966458Sdfr mld6_timers_are_running = 1; 37066458Sdfr } 37166458Sdfr IN6_NEXT_MULTI(step, in6m); 37266458Sdfr } 37366458Sdfr splx(s); 37466458Sdfr} 37566458Sdfr 37666458Sdfrstatic void 37766458Sdfrmld6_sendpkt(in6m, type, dst) 37866458Sdfr struct in6_multi *in6m; 37966458Sdfr int type; 38080431Speter const struct in6_addr *dst; 38180431Speter{ 38280431Speter struct mbuf *mh, *md; 38380431Speter struct mld_hdr *mldh; 38466458Sdfr struct ip6_hdr *ip6; 38566458Sdfr struct ip6_moptions im6o; 38666458Sdfr struct in6_ifaddr *ia; 38766458Sdfr struct ifnet *ifp = in6m->in6m_ifp; 38866458Sdfr struct ifnet *outif = NULL; 38966458Sdfr 39066458Sdfr /* 39166458Sdfr * At first, find a link local address on the outgoing interface 39266458Sdfr * to use as the source address of the MLD packet. 39366458Sdfr */ 39466937Sdfr if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 39566458Sdfr == NULL) 39666937Sdfr return; 39766937Sdfr 39866937Sdfr /* 39966937Sdfr * Allocate mbufs to store ip6 header and MLD header. 40066937Sdfr * We allocate 2 mbufs and make chain in advance because 40166937Sdfr * it is more convenient when inserting the hop-by-hop option later. 40266458Sdfr */ 40366458Sdfr MGETHDR(mh, M_DONTWAIT, MT_HEADER); 40466458Sdfr if (mh == NULL) 40566458Sdfr return; 40666458Sdfr MGET(md, M_DONTWAIT, MT_DATA); 40775668Sdfr if (md == NULL) { 40866937Sdfr m_free(mh); 40966937Sdfr return; 41066458Sdfr } 41166458Sdfr mh->m_next = md; 41266458Sdfr 41366458Sdfr mh->m_pkthdr.rcvif = NULL; 41466458Sdfr mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 41566937Sdfr mh->m_len = sizeof(struct ip6_hdr); 41666937Sdfr MH_ALIGN(mh, sizeof(struct ip6_hdr)); 41774903Sjhb 41866937Sdfr /* fill in the ip6 header */ 41975668Sdfr ip6 = mtod(mh, struct ip6_hdr *); 42066937Sdfr ip6->ip6_flow = 0; 42166937Sdfr ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 42274903Sjhb ip6->ip6_vfc |= IPV6_VERSION; 42366937Sdfr /* ip6_plen will be set later */ 42466937Sdfr ip6->ip6_nxt = IPPROTO_ICMPV6; 42566937Sdfr /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ 42666937Sdfr ip6->ip6_src = ia->ia_addr.sin6_addr; 42766937Sdfr ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; 42866937Sdfr 42966937Sdfr /* fill in the MLD header */ 43066937Sdfr md->m_len = sizeof(struct mld_hdr); 43174903Sjhb mldh = mtod(md, struct mld_hdr *); 43266458Sdfr mldh->mld_type = type; 43366458Sdfr mldh->mld_code = 0; 43466458Sdfr mldh->mld_cksum = 0; 43566937Sdfr /* XXX: we assume the function will not be called for query messages */ 43666458Sdfr mldh->mld_maxdelay = 0; 43766937Sdfr mldh->mld_reserved = 0; 43866937Sdfr mldh->mld_addr = in6m->in6m_addr; 43966937Sdfr if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr)) 44066937Sdfr mldh->mld_addr.s6_addr16[1] = 0; /* XXX */ 44166937Sdfr mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, 44266937Sdfr sizeof(struct ip6_hdr), 44366937Sdfr sizeof(struct mld_hdr)); 44466937Sdfr 44566937Sdfr /* construct multicast option */ 44666937Sdfr bzero(&im6o, sizeof(im6o)); 44766937Sdfr im6o.im6o_multicast_ifp = ifp; 44866937Sdfr im6o.im6o_multicast_hlim = 1; 44966937Sdfr 45066458Sdfr /* 45166937Sdfr * Request loopback of the report if we are acting as a multicast 45266937Sdfr * router, so that the process-level routing daemon can hear it. 45366458Sdfr */ 45466458Sdfr im6o.im6o_multicast_loop = (ip6_mrouter != NULL); 45566937Sdfr 45666937Sdfr /* increment output statictics */ 45766458Sdfr icmp6stat.icp6s_outhist[type]++; 45866458Sdfr 45966458Sdfr ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif); 46066458Sdfr if (outif) { 46166458Sdfr icmp6_ifstat_inc(outif, ifs6_out_msg); 46266458Sdfr switch (type) { 46366458Sdfr case MLD_LISTENER_QUERY: 46466458Sdfr icmp6_ifstat_inc(outif, ifs6_out_mldquery); 46566458Sdfr break; 46666458Sdfr case MLD_LISTENER_REPORT: 46766458Sdfr icmp6_ifstat_inc(outif, ifs6_out_mldreport); 46866458Sdfr break; 46966458Sdfr case MLD_LISTENER_DONE: 47066458Sdfr icmp6_ifstat_inc(outif, ifs6_out_mlddone); 47166458Sdfr break; 47266458Sdfr } 47366458Sdfr } 47466458Sdfr} 47566458Sdfr