mld6.c revision 1.20 1 1.20 itojun /* $NetBSD: mld6.c,v 1.20 2002/06/09 14:43:13 itojun Exp $ */
2 1.13 itojun /* $KAME: mld6.c,v 1.25 2001/01/16 14:14:18 itojun Exp $ */
3 1.3 thorpej
4 1.2 itojun /*
5 1.2 itojun * Copyright (C) 1998 WIDE Project.
6 1.2 itojun * All rights reserved.
7 1.13 itojun *
8 1.2 itojun * Redistribution and use in source and binary forms, with or without
9 1.2 itojun * modification, are permitted provided that the following conditions
10 1.2 itojun * are met:
11 1.2 itojun * 1. Redistributions of source code must retain the above copyright
12 1.2 itojun * notice, this list of conditions and the following disclaimer.
13 1.2 itojun * 2. Redistributions in binary form must reproduce the above copyright
14 1.2 itojun * notice, this list of conditions and the following disclaimer in the
15 1.2 itojun * documentation and/or other materials provided with the distribution.
16 1.2 itojun * 3. Neither the name of the project nor the names of its contributors
17 1.2 itojun * may be used to endorse or promote products derived from this software
18 1.2 itojun * without specific prior written permission.
19 1.13 itojun *
20 1.2 itojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 1.2 itojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 1.2 itojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 1.2 itojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 1.2 itojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 1.2 itojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 1.2 itojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 1.2 itojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 1.2 itojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 1.2 itojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 1.2 itojun * SUCH DAMAGE.
31 1.2 itojun */
32 1.2 itojun
33 1.2 itojun /*
34 1.2 itojun * Copyright (c) 1988 Stephen Deering.
35 1.2 itojun * Copyright (c) 1992, 1993
36 1.2 itojun * The Regents of the University of California. All rights reserved.
37 1.2 itojun *
38 1.2 itojun * This code is derived from software contributed to Berkeley by
39 1.2 itojun * Stephen Deering of Stanford University.
40 1.2 itojun *
41 1.2 itojun * Redistribution and use in source and binary forms, with or without
42 1.2 itojun * modification, are permitted provided that the following conditions
43 1.2 itojun * are met:
44 1.2 itojun * 1. Redistributions of source code must retain the above copyright
45 1.2 itojun * notice, this list of conditions and the following disclaimer.
46 1.2 itojun * 2. Redistributions in binary form must reproduce the above copyright
47 1.2 itojun * notice, this list of conditions and the following disclaimer in the
48 1.2 itojun * documentation and/or other materials provided with the distribution.
49 1.2 itojun * 3. All advertising materials mentioning features or use of this software
50 1.2 itojun * must display the following acknowledgement:
51 1.2 itojun * This product includes software developed by the University of
52 1.2 itojun * California, Berkeley and its contributors.
53 1.2 itojun * 4. Neither the name of the University nor the names of its contributors
54 1.2 itojun * may be used to endorse or promote products derived from this software
55 1.2 itojun * without specific prior written permission.
56 1.2 itojun *
57 1.2 itojun * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
58 1.2 itojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
59 1.2 itojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
60 1.2 itojun * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
61 1.2 itojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
62 1.2 itojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
63 1.2 itojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64 1.2 itojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
65 1.2 itojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
66 1.2 itojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 1.2 itojun * SUCH DAMAGE.
68 1.2 itojun *
69 1.2 itojun * @(#)igmp.c 8.1 (Berkeley) 7/19/93
70 1.2 itojun */
71 1.16 lukem
72 1.16 lukem #include <sys/cdefs.h>
73 1.20 itojun __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.20 2002/06/09 14:43:13 itojun Exp $");
74 1.2 itojun
75 1.2 itojun #include "opt_inet.h"
76 1.2 itojun
77 1.2 itojun #include <sys/param.h>
78 1.2 itojun #include <sys/systm.h>
79 1.2 itojun #include <sys/mbuf.h>
80 1.2 itojun #include <sys/socket.h>
81 1.2 itojun #include <sys/protosw.h>
82 1.2 itojun #include <sys/syslog.h>
83 1.2 itojun
84 1.2 itojun #include <net/if.h>
85 1.2 itojun
86 1.2 itojun #include <netinet/in.h>
87 1.2 itojun #include <netinet/in_var.h>
88 1.10 itojun #include <netinet/ip6.h>
89 1.2 itojun #include <netinet6/ip6_var.h>
90 1.10 itojun #include <netinet/icmp6.h>
91 1.2 itojun #include <netinet6/mld6_var.h>
92 1.2 itojun
93 1.7 itojun #include <net/net_osdep.h>
94 1.7 itojun
95 1.2 itojun /*
96 1.2 itojun * Protocol constants
97 1.2 itojun */
98 1.2 itojun
99 1.2 itojun /* denotes that the MLD max response delay field specifies time in milliseconds */
100 1.2 itojun #define MLD6_TIMER_SCALE 1000
101 1.2 itojun /*
102 1.2 itojun * time between repetitions of a node's initial report of interest in a
103 1.2 itojun * multicast address(in seconds)
104 1.2 itojun */
105 1.2 itojun #define MLD6_UNSOLICITED_REPORT_INTERVAL 10
106 1.2 itojun
107 1.2 itojun static struct ip6_pktopts ip6_opts;
108 1.2 itojun static int mld6_timers_are_running;
109 1.2 itojun /* XXX: These are necessary for KAME's link-local hack */
110 1.2 itojun static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
111 1.2 itojun static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
112 1.2 itojun
113 1.2 itojun static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
114 1.2 itojun
115 1.2 itojun void
116 1.2 itojun mld6_init()
117 1.2 itojun {
118 1.2 itojun static u_int8_t hbh_buf[8];
119 1.2 itojun struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
120 1.2 itojun u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
121 1.2 itojun
122 1.2 itojun mld6_timers_are_running = 0;
123 1.2 itojun
124 1.2 itojun /* ip6h_nxt will be fill in later */
125 1.11 itojun hbh->ip6h_len = 0; /* (8 >> 3) - 1 */
126 1.2 itojun
127 1.2 itojun /* XXX: grotty hard coding... */
128 1.2 itojun hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */
129 1.2 itojun hbh_buf[3] = 0;
130 1.2 itojun hbh_buf[4] = IP6OPT_RTALERT;
131 1.2 itojun hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
132 1.2 itojun bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
133 1.2 itojun
134 1.2 itojun ip6_opts.ip6po_hbh = hbh;
135 1.2 itojun /* We will specify the hoplimit by a multicast option. */
136 1.2 itojun ip6_opts.ip6po_hlim = -1;
137 1.2 itojun }
138 1.2 itojun
139 1.2 itojun void
140 1.2 itojun mld6_start_listening(in6m)
141 1.2 itojun struct in6_multi *in6m;
142 1.2 itojun {
143 1.4 itojun int s = splsoftnet();
144 1.2 itojun
145 1.2 itojun /*
146 1.11 itojun * RFC2710 page 10:
147 1.2 itojun * The node never sends a Report or Done for the link-scope all-nodes
148 1.2 itojun * address.
149 1.2 itojun * MLD messages are never sent for multicast addresses whose scope is 0
150 1.2 itojun * (reserved) or 1 (node-local).
151 1.2 itojun */
152 1.2 itojun mld6_all_nodes_linklocal.s6_addr16[1] =
153 1.19 itojun htons(in6m->in6m_ifp->if_index); /* XXX */
154 1.2 itojun if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) ||
155 1.2 itojun IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
156 1.2 itojun in6m->in6m_timer = 0;
157 1.2 itojun in6m->in6m_state = MLD6_OTHERLISTENER;
158 1.2 itojun } else {
159 1.2 itojun mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
160 1.19 itojun in6m->in6m_timer =
161 1.19 itojun MLD6_RANDOM_DELAY(MLD6_UNSOLICITED_REPORT_INTERVAL *
162 1.19 itojun PR_FASTHZ);
163 1.2 itojun in6m->in6m_state = MLD6_IREPORTEDLAST;
164 1.2 itojun mld6_timers_are_running = 1;
165 1.2 itojun }
166 1.2 itojun splx(s);
167 1.2 itojun }
168 1.2 itojun
169 1.2 itojun void
170 1.2 itojun mld6_stop_listening(in6m)
171 1.2 itojun struct in6_multi *in6m;
172 1.2 itojun {
173 1.2 itojun mld6_all_nodes_linklocal.s6_addr16[1] =
174 1.19 itojun htons(in6m->in6m_ifp->if_index); /* XXX */
175 1.2 itojun mld6_all_routers_linklocal.s6_addr16[1] =
176 1.19 itojun htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
177 1.2 itojun
178 1.2 itojun if (in6m->in6m_state == MLD6_IREPORTEDLAST &&
179 1.2 itojun (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) &&
180 1.2 itojun IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
181 1.2 itojun mld6_sendpkt(in6m, MLD6_LISTENER_DONE,
182 1.19 itojun &mld6_all_routers_linklocal);
183 1.2 itojun }
184 1.2 itojun
185 1.2 itojun void
186 1.2 itojun mld6_input(m, off)
187 1.2 itojun struct mbuf *m;
188 1.2 itojun int off;
189 1.2 itojun {
190 1.2 itojun struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
191 1.11 itojun struct mld6_hdr *mldh;
192 1.2 itojun struct ifnet *ifp = m->m_pkthdr.rcvif;
193 1.2 itojun struct in6_multi *in6m;
194 1.2 itojun struct in6_ifaddr *ia;
195 1.2 itojun int timer; /* timer value in the MLD query header */
196 1.2 itojun
197 1.13 itojun #ifndef PULLDOWN_TEST
198 1.13 itojun IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),);
199 1.13 itojun mldh = (struct mld6_hdr *)(mtod(m, caddr_t) + off);
200 1.13 itojun #else
201 1.13 itojun IP6_EXTHDR_GET(mldh, struct mld6_hdr *, m, off, sizeof(*mldh));
202 1.13 itojun if (mldh == NULL) {
203 1.13 itojun icmp6stat.icp6s_tooshort++;
204 1.13 itojun return;
205 1.13 itojun }
206 1.13 itojun #endif
207 1.13 itojun
208 1.2 itojun /* source address validation */
209 1.13 itojun ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
210 1.2 itojun if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
211 1.18 itojun #if 0
212 1.2 itojun log(LOG_ERR,
213 1.13 itojun "mld6_input: src %s is not link-local (grp=%s)\n",
214 1.13 itojun ip6_sprintf(&ip6->ip6_src),
215 1.13 itojun ip6_sprintf(&mldh->mld6_addr));
216 1.18 itojun #endif
217 1.2 itojun /*
218 1.11 itojun * spec (RFC2710) does not explicitly
219 1.2 itojun * specify to discard the packet from a non link-local
220 1.2 itojun * source address. But we believe it's expected to do so.
221 1.13 itojun * XXX: do we have to allow :: as source?
222 1.2 itojun */
223 1.11 itojun m_freem(m);
224 1.2 itojun return;
225 1.2 itojun }
226 1.2 itojun
227 1.2 itojun /*
228 1.2 itojun * In the MLD6 specification, there are 3 states and a flag.
229 1.2 itojun *
230 1.2 itojun * In Non-Listener state, we simply don't have a membership record.
231 1.2 itojun * In Delaying Listener state, our timer is running (in6m->in6m_timer)
232 1.2 itojun * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
233 1.2 itojun *
234 1.2 itojun * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if
235 1.2 itojun * we have heard a report from another member, or MLD6_IREPORTEDLAST
236 1.2 itojun * if we sent the last report.
237 1.2 itojun */
238 1.17 itojun switch (mldh->mld6_type) {
239 1.7 itojun case MLD6_LISTENER_QUERY:
240 1.7 itojun if (ifp->if_flags & IFF_LOOPBACK)
241 1.7 itojun break;
242 1.7 itojun
243 1.7 itojun if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) &&
244 1.13 itojun !IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
245 1.7 itojun break; /* print error or log stat? */
246 1.7 itojun if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
247 1.7 itojun mldh->mld6_addr.s6_addr16[1] =
248 1.19 itojun htons(ifp->if_index); /* XXX */
249 1.2 itojun
250 1.7 itojun /*
251 1.11 itojun * - Start the timers in all of our membership records
252 1.11 itojun * that the query applies to for the interface on
253 1.11 itojun * which the query arrived excl. those that belong
254 1.11 itojun * to the "all-nodes" group (ff02::1).
255 1.11 itojun * - Restart any timer that is already running but has
256 1.11 itojun * A value longer than the requested timeout.
257 1.11 itojun * - Use the value specified in the query message as
258 1.11 itojun * the maximum timeout.
259 1.11 itojun */
260 1.7 itojun IFP_TO_IA6(ifp, ia);
261 1.7 itojun if (ia == NULL)
262 1.7 itojun break;
263 1.2 itojun
264 1.2 itojun /*
265 1.11 itojun * XXX: System timer resolution is too low to handle Max
266 1.11 itojun * Response Delay, so set 1 to the internal timer even if
267 1.11 itojun * the calculated value equals to zero when Max Response
268 1.11 itojun * Delay is positive.
269 1.11 itojun */
270 1.7 itojun timer = ntohs(mldh->mld6_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE;
271 1.7 itojun if (timer == 0 && mldh->mld6_maxdelay)
272 1.7 itojun timer = 1;
273 1.7 itojun mld6_all_nodes_linklocal.s6_addr16[1] =
274 1.7 itojun htons(ifp->if_index); /* XXX */
275 1.20 itojun
276 1.7 itojun for (in6m = ia->ia6_multiaddrs.lh_first;
277 1.7 itojun in6m;
278 1.7 itojun in6m = in6m->in6m_entry.le_next)
279 1.7 itojun {
280 1.7 itojun if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
281 1.2 itojun &mld6_all_nodes_linklocal) ||
282 1.7 itojun IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
283 1.7 itojun IPV6_ADDR_SCOPE_LINKLOCAL)
284 1.7 itojun continue;
285 1.2 itojun
286 1.7 itojun if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) ||
287 1.7 itojun IN6_ARE_ADDR_EQUAL(&mldh->mld6_addr,
288 1.7 itojun &in6m->in6m_addr))
289 1.7 itojun {
290 1.7 itojun if (timer == 0) {
291 1.7 itojun /* send a report immediately */
292 1.7 itojun mld6_sendpkt(in6m, MLD6_LISTENER_REPORT,
293 1.19 itojun NULL);
294 1.7 itojun in6m->in6m_timer = 0; /* reset timer */
295 1.7 itojun in6m->in6m_state = MLD6_IREPORTEDLAST;
296 1.7 itojun }
297 1.7 itojun else if (in6m->in6m_timer == 0 || /*idle state*/
298 1.19 itojun in6m->in6m_timer > timer) {
299 1.7 itojun in6m->in6m_timer =
300 1.19 itojun MLD6_RANDOM_DELAY(timer);
301 1.7 itojun mld6_timers_are_running = 1;
302 1.7 itojun }
303 1.7 itojun }
304 1.7 itojun }
305 1.2 itojun
306 1.7 itojun if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
307 1.7 itojun mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
308 1.7 itojun break;
309 1.7 itojun case MLD6_LISTENER_REPORT:
310 1.2 itojun /*
311 1.11 itojun * For fast leave to work, we have to know that we are the
312 1.11 itojun * last person to send a report for this group. Reports
313 1.11 itojun * can potentially get looped back if we are a multicast
314 1.11 itojun * router, so discard reports sourced by me.
315 1.11 itojun * Note that it is impossible to check IFF_LOOPBACK flag of
316 1.11 itojun * ifp for this purpose, since ip6_mloopback pass the physical
317 1.11 itojun * interface to looutput.
318 1.11 itojun */
319 1.7 itojun if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
320 1.7 itojun break;
321 1.7 itojun
322 1.7 itojun if (!IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
323 1.7 itojun break;
324 1.7 itojun
325 1.7 itojun if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
326 1.7 itojun mldh->mld6_addr.s6_addr16[1] =
327 1.7 itojun htons(ifp->if_index); /* XXX */
328 1.7 itojun /*
329 1.11 itojun * If we belong to the group being reported, stop
330 1.11 itojun * our timer for that group.
331 1.11 itojun */
332 1.7 itojun IN6_LOOKUP_MULTI(mldh->mld6_addr, ifp, in6m);
333 1.7 itojun if (in6m) {
334 1.7 itojun in6m->in6m_timer = 0; /* transit to idle state */
335 1.7 itojun in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */
336 1.7 itojun }
337 1.7 itojun
338 1.7 itojun if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
339 1.7 itojun mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
340 1.7 itojun break;
341 1.7 itojun default: /* this is impossible */
342 1.18 itojun #if 0
343 1.19 itojun /*
344 1.19 itojun * this case should be impossible because of filtering in
345 1.19 itojun * icmp6_input(). But we explicitly disabled this part
346 1.19 itojun * just in case.
347 1.19 itojun */
348 1.7 itojun log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld6_type);
349 1.18 itojun #endif
350 1.7 itojun break;
351 1.2 itojun }
352 1.11 itojun
353 1.11 itojun m_freem(m);
354 1.2 itojun }
355 1.2 itojun
356 1.2 itojun void
357 1.2 itojun mld6_fasttimeo()
358 1.2 itojun {
359 1.13 itojun struct in6_multi *in6m;
360 1.2 itojun struct in6_multistep step;
361 1.2 itojun int s;
362 1.2 itojun /*
363 1.2 itojun * Quick check to see if any work needs to be done, in order
364 1.2 itojun * to minimize the overhead of fasttimo processing.
365 1.2 itojun */
366 1.2 itojun if (!mld6_timers_are_running)
367 1.2 itojun return;
368 1.2 itojun
369 1.4 itojun s = splsoftnet();
370 1.2 itojun mld6_timers_are_running = 0;
371 1.2 itojun IN6_FIRST_MULTI(step, in6m);
372 1.2 itojun while (in6m != NULL) {
373 1.2 itojun if (in6m->in6m_timer == 0) {
374 1.2 itojun /* do nothing */
375 1.2 itojun } else if (--in6m->in6m_timer == 0) {
376 1.2 itojun mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
377 1.2 itojun in6m->in6m_state = MLD6_IREPORTEDLAST;
378 1.2 itojun } else {
379 1.2 itojun mld6_timers_are_running = 1;
380 1.2 itojun }
381 1.2 itojun IN6_NEXT_MULTI(step, in6m);
382 1.2 itojun }
383 1.2 itojun splx(s);
384 1.2 itojun }
385 1.2 itojun
386 1.2 itojun static void
387 1.2 itojun mld6_sendpkt(in6m, type, dst)
388 1.2 itojun struct in6_multi *in6m;
389 1.2 itojun int type;
390 1.2 itojun const struct in6_addr *dst;
391 1.2 itojun {
392 1.2 itojun struct mbuf *mh, *md;
393 1.2 itojun struct mld6_hdr *mldh;
394 1.2 itojun struct ip6_hdr *ip6;
395 1.2 itojun struct ip6_moptions im6o;
396 1.2 itojun struct in6_ifaddr *ia;
397 1.2 itojun struct ifnet *ifp = in6m->in6m_ifp;
398 1.19 itojun int ignflags;
399 1.2 itojun
400 1.2 itojun /*
401 1.2 itojun * At first, find a link local address on the outgoing interface
402 1.2 itojun * to use as the source address of the MLD packet.
403 1.19 itojun * We do not reject tentative addresses for MLD report to deal with
404 1.19 itojun * the case where we first join a link-local address.
405 1.2 itojun */
406 1.19 itojun ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
407 1.19 itojun if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
408 1.2 itojun return;
409 1.19 itojun if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
410 1.19 itojun ia = NULL;
411 1.2 itojun
412 1.2 itojun /*
413 1.2 itojun * Allocate mbufs to store ip6 header and MLD header.
414 1.2 itojun * We allocate 2 mbufs and make chain in advance because
415 1.2 itojun * it is more convenient when inserting the hop-by-hop option later.
416 1.2 itojun */
417 1.2 itojun MGETHDR(mh, M_DONTWAIT, MT_HEADER);
418 1.2 itojun if (mh == NULL)
419 1.2 itojun return;
420 1.2 itojun MGET(md, M_DONTWAIT, MT_DATA);
421 1.2 itojun if (md == NULL) {
422 1.2 itojun m_free(mh);
423 1.2 itojun return;
424 1.2 itojun }
425 1.2 itojun mh->m_next = md;
426 1.2 itojun
427 1.19 itojun mh->m_pkthdr.rcvif = NULL;
428 1.2 itojun mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld6_hdr);
429 1.2 itojun mh->m_len = sizeof(struct ip6_hdr);
430 1.2 itojun MH_ALIGN(mh, sizeof(struct ip6_hdr));
431 1.2 itojun
432 1.2 itojun /* fill in the ip6 header */
433 1.2 itojun ip6 = mtod(mh, struct ip6_hdr *);
434 1.2 itojun ip6->ip6_flow = 0;
435 1.8 itojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
436 1.8 itojun ip6->ip6_vfc |= IPV6_VERSION;
437 1.2 itojun /* ip6_plen will be set later */
438 1.2 itojun ip6->ip6_nxt = IPPROTO_ICMPV6;
439 1.2 itojun /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
440 1.19 itojun ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
441 1.2 itojun ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
442 1.2 itojun
443 1.2 itojun /* fill in the MLD header */
444 1.2 itojun md->m_len = sizeof(struct mld6_hdr);
445 1.2 itojun mldh = mtod(md, struct mld6_hdr *);
446 1.2 itojun mldh->mld6_type = type;
447 1.2 itojun mldh->mld6_code = 0;
448 1.2 itojun mldh->mld6_cksum = 0;
449 1.2 itojun /* XXX: we assume the function will not be called for query messages */
450 1.2 itojun mldh->mld6_maxdelay = 0;
451 1.2 itojun mldh->mld6_reserved = 0;
452 1.2 itojun mldh->mld6_addr = in6m->in6m_addr;
453 1.2 itojun if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
454 1.2 itojun mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
455 1.14 itojun mldh->mld6_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
456 1.14 itojun sizeof(struct ip6_hdr),
457 1.19 itojun sizeof(struct mld6_hdr));
458 1.2 itojun
459 1.2 itojun /* construct multicast option */
460 1.2 itojun bzero(&im6o, sizeof(im6o));
461 1.2 itojun im6o.im6o_multicast_ifp = ifp;
462 1.2 itojun im6o.im6o_multicast_hlim = 1;
463 1.2 itojun
464 1.2 itojun /*
465 1.2 itojun * Request loopback of the report if we are acting as a multicast
466 1.2 itojun * router, so that the process-level routing daemon can hear it.
467 1.2 itojun */
468 1.2 itojun im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
469 1.2 itojun
470 1.2 itojun /* increment output statictics */
471 1.2 itojun icmp6stat.icp6s_outhist[type]++;
472 1.15 itojun icmp6_ifstat_inc(ifp, ifs6_out_msg);
473 1.17 itojun switch (type) {
474 1.15 itojun case MLD6_LISTENER_QUERY:
475 1.15 itojun icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
476 1.15 itojun break;
477 1.15 itojun case MLD6_LISTENER_REPORT:
478 1.15 itojun icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
479 1.15 itojun break;
480 1.15 itojun case MLD6_LISTENER_DONE:
481 1.15 itojun icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
482 1.15 itojun break;
483 1.7 itojun }
484 1.19 itojun
485 1.19 itojun ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, &im6o, NULL);
486 1.2 itojun }
487