1 /* $FreeBSD: src/sys/netinet6/mld6.c,v 1.4.2.4 2003/01/23 21:06:47 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/mld6.c,v 1.6 2005/06/03 19:56:08 eirikn Exp $ */
3 /* $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $ */
6 * Copyright (C) 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1988 Stephen Deering.
36 * Copyright (c) 1992, 1993
37 * The Regents of the University of California. All rights reserved.
39 * This code is derived from software contributed to Berkeley by
40 * Stephen Deering of Stanford University.
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 3. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)igmp.c 8.1 (Berkeley) 7/19/93
70 #include "opt_inet6.h"
72 #include <sys/param.h>
73 #include <sys/systm.h>
75 #include <sys/socket.h>
76 #include <sys/protosw.h>
77 #include <sys/syslog.h>
78 #include <sys/thread2.h>
82 #include <netinet/in.h>
83 #include <netinet/in_var.h>
84 #include <netinet/ip6.h>
85 #include <netinet6/ip6_var.h>
86 #include <netinet/icmp6.h>
87 #include <netinet6/mld6_var.h>
89 #include <net/net_osdep.h>
95 /* denotes that the MLD max response delay field specifies time in milliseconds */
96 #define MLD6_TIMER_SCALE 1000
98 * time between repetitions of a node's initial report of interest in a
99 * multicast address(in seconds)
101 #define MLD6_UNSOLICITED_REPORT_INTERVAL 10
103 static struct ip6_pktopts ip6_opts;
104 static int mld6_timers_are_running;
105 /* XXX: These are necessary for KAME's link-local hack */
106 static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
107 static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
109 static void mld6_sendpkt (struct in6_multi *, int, const struct in6_addr *);
111 static struct lwkt_token mld6_token = LWKT_TOKEN_INITIALIZER(mp_token);
117 static u_int8_t hbh_buf[8];
118 struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
119 u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
121 mld6_timers_are_running = 0;
123 /* ip6h_nxt will be fill in later */
124 hbh->ip6h_len = 0; /* (8 >> 3) - 1 */
126 /* XXX: grotty hard coding... */
127 hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */
129 hbh_buf[4] = IP6OPT_RTALERT;
130 hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
131 bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
133 init_ip6pktopts(&ip6_opts);
134 ip6_opts.ip6po_hbh = hbh;
138 mld6_start_listening(struct in6_multi *in6m)
142 * The node never sends a Report or Done for the link-scope all-nodes
144 * MLD messages are never sent for multicast addresses whose scope is 0
145 * (reserved) or 1 (node-local).
147 lwkt_gettoken(&mld6_token);
148 mld6_all_nodes_linklocal.s6_addr16[1] =
149 htons(in6m->in6m_ifp->if_index); /* XXX */
150 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) ||
151 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
152 in6m->in6m_timer = 0;
153 in6m->in6m_state = MLD6_OTHERLISTENER;
155 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
156 in6m->in6m_timer = MLD6_RANDOM_DELAY(
157 MLD6_UNSOLICITED_REPORT_INTERVAL * PR_FASTHZ);
158 in6m->in6m_state = MLD6_IREPORTEDLAST;
159 mld6_timers_are_running = 1;
161 lwkt_reltoken(&mld6_token);
165 mld6_stop_listening(struct in6_multi *in6m)
167 mld6_all_nodes_linklocal.s6_addr16[1] =
168 htons(in6m->in6m_ifp->if_index); /* XXX */
169 mld6_all_routers_linklocal.s6_addr16[1] =
170 htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
172 if (in6m->in6m_state == MLD6_IREPORTEDLAST &&
173 (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) &&
174 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
175 mld6_sendpkt(in6m, MLD_LISTENER_DONE,
176 &mld6_all_routers_linklocal);
180 mld6_input(struct mbuf *m, int off)
183 struct mld_hdr *mldh;
184 struct ifnet *ifp = m->m_pkthdr.rcvif;
185 struct in6_multi *in6m;
186 struct in6_ifaddr *ia;
187 struct ifmultiaddr *ifma;
188 int timer; /* timer value in the MLD query header */
190 #ifndef PULLDOWN_TEST
191 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),);
192 mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off);
194 IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
196 icmp6stat.icp6s_tooshort++;
201 lwkt_gettoken(&mld6_token);
202 /* source address validation */
203 ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
204 if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
206 "mld6_input: src %s is not link-local (grp=%s)\n",
207 ip6_sprintf(&ip6->ip6_src),
208 ip6_sprintf(&mldh->mld_addr));
210 * spec (RFC2710) does not explicitly
211 * specify to discard the packet from a non link-local
212 * source address. But we believe it's expected to do so.
213 * XXX: do we have to allow :: as source?
216 lwkt_reltoken(&mld6_token);
221 * In the MLD6 specification, there are 3 states and a flag.
223 * In Non-Listener state, we simply don't have a membership record.
224 * In Delaying Listener state, our timer is running (in6m->in6m_timer)
225 * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
227 * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if
228 * we have heard a report from another member, or MLD6_IREPORTEDLAST
229 * if we sent the last report.
231 switch(mldh->mld_type) {
232 case MLD_LISTENER_QUERY:
233 if (ifp->if_flags & IFF_LOOPBACK)
236 if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) &&
237 !IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
238 break; /* print error or log stat? */
239 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
240 mldh->mld_addr.s6_addr16[1] =
241 htons(ifp->if_index); /* XXX */
244 * - Start the timers in all of our membership records
245 * that the query applies to for the interface on
246 * which the query arrived excl. those that belong
247 * to the "all-nodes" group (ff02::1).
248 * - Restart any timer that is already running but has
249 * A value longer than the requested timeout.
250 * - Use the value specified in the query message as
251 * the maximum timeout.
258 * XXX: System timer resolution is too low to handle Max
259 * Response Delay, so set 1 to the internal timer even if
260 * the calculated value equals to zero when Max Response
263 timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE;
264 if (timer == 0 && mldh->mld_maxdelay)
266 mld6_all_nodes_linklocal.s6_addr16[1] =
267 htons(ifp->if_index); /* XXX */
269 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
271 if (ifma->ifma_addr->sa_family != AF_INET6)
273 in6m = (struct in6_multi *)ifma->ifma_protospec;
274 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
275 &mld6_all_nodes_linklocal) ||
276 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
277 IPV6_ADDR_SCOPE_LINKLOCAL)
280 if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) ||
281 IN6_ARE_ADDR_EQUAL(&mldh->mld_addr,
285 /* send a report immediately */
286 mld6_sendpkt(in6m, MLD_LISTENER_REPORT,
288 in6m->in6m_timer = 0; /* reset timer */
289 in6m->in6m_state = MLD6_IREPORTEDLAST;
291 else if (in6m->in6m_timer == 0 || /*idle state*/
292 in6m->in6m_timer > timer) {
294 MLD6_RANDOM_DELAY(timer);
295 mld6_timers_are_running = 1;
300 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
301 mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
303 case MLD_LISTENER_REPORT:
305 * For fast leave to work, we have to know that we are the
306 * last person to send a report for this group. Reports
307 * can potentially get looped back if we are a multicast
308 * router, so discard reports sourced by me.
309 * Note that it is impossible to check IFF_LOOPBACK flag of
310 * ifp for this purpose, since ip6_mloopback pass the physical
311 * interface to looutput.
313 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
316 if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
319 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
320 mldh->mld_addr.s6_addr16[1] =
321 htons(ifp->if_index); /* XXX */
323 * If we belong to the group being reported, stop
324 * our timer for that group.
326 IN6_LOOKUP_MULTI(mldh->mld_addr, ifp, in6m);
328 in6m->in6m_timer = 0; /* transit to idle state */
329 in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */
332 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
333 mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
335 default: /* this is impossible */
336 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type);
341 lwkt_reltoken(&mld6_token);
347 struct in6_multi *in6m;
348 struct in6_multistep step;
351 * Quick check to see if any work needs to be done, in order
352 * to minimize the overhead of fasttimo processing.
354 lwkt_gettoken(&mld6_token);
355 if (!mld6_timers_are_running) {
356 lwkt_reltoken(&mld6_token);
360 mld6_timers_are_running = 0;
361 IN6_FIRST_MULTI(step, in6m);
362 while (in6m != NULL) {
363 if (in6m->in6m_timer == 0) {
365 } else if (--in6m->in6m_timer == 0) {
366 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
367 in6m->in6m_state = MLD6_IREPORTEDLAST;
369 mld6_timers_are_running = 1;
371 IN6_NEXT_MULTI(step, in6m);
373 lwkt_reltoken(&mld6_token);
377 mld6_sendpkt(struct in6_multi *in6m, int type, const struct in6_addr *dst)
379 struct mbuf *mh, *md;
380 struct mld_hdr *mldh;
382 struct ip6_moptions im6o;
383 struct in6_ifaddr *ia;
384 struct ifnet *ifp = in6m->in6m_ifp;
385 struct ifnet *outif = NULL;
388 * At first, find a link local address on the outgoing interface
389 * to use as the source address of the MLD packet.
391 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST))
396 * Allocate mbufs to store ip6 header and MLD header.
397 * We allocate 2 mbufs and make chain in advance because
398 * it is more convenient when inserting the hop-by-hop option later.
400 MGETHDR(mh, MB_DONTWAIT, MT_HEADER);
403 MGET(md, MB_DONTWAIT, MT_DATA);
410 mh->m_pkthdr.rcvif = NULL;
411 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
412 mh->m_len = sizeof(struct ip6_hdr);
413 MH_ALIGN(mh, sizeof(struct ip6_hdr));
415 /* fill in the ip6 header */
416 ip6 = mtod(mh, struct ip6_hdr *);
418 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
419 ip6->ip6_vfc |= IPV6_VERSION;
420 /* ip6_plen will be set later */
421 ip6->ip6_nxt = IPPROTO_ICMPV6;
422 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
423 ip6->ip6_src = ia->ia_addr.sin6_addr;
424 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
426 /* fill in the MLD header */
427 md->m_len = sizeof(struct mld_hdr);
428 mldh = mtod(md, struct mld_hdr *);
429 mldh->mld_type = type;
432 /* XXX: we assume the function will not be called for query messages */
433 mldh->mld_maxdelay = 0;
434 mldh->mld_reserved = 0;
435 mldh->mld_addr = in6m->in6m_addr;
436 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
437 mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
438 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
439 sizeof(struct ip6_hdr),
440 sizeof(struct mld_hdr));
442 /* construct multicast option */
443 bzero(&im6o, sizeof(im6o));
444 im6o.im6o_multicast_ifp = ifp;
445 im6o.im6o_multicast_hlim = 1;
448 * Request loopback of the report if we are acting as a multicast
449 * router, so that the process-level routing daemon can hear it.
451 im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
453 /* increment output statictics */
454 icmp6stat.icp6s_outhist[type]++;
456 ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif, NULL);
458 icmp6_ifstat_inc(outif, ifs6_out_msg);
460 case MLD_LISTENER_QUERY:
461 icmp6_ifstat_inc(outif, ifs6_out_mldquery);
463 case MLD_LISTENER_REPORT:
464 icmp6_ifstat_inc(outif, ifs6_out_mldreport);
466 case MLD_LISTENER_DONE:
467 icmp6_ifstat_inc(outif, ifs6_out_mlddone);