Annotation of src/sys/netinet6/mld6.c, Revision 1.28.2.1
1.28.2.1! yamt 1: /* $NetBSD: mld6.c,v 1.28 2005/12/11 12:25:02 christos Exp $ */
1.13 itojun 2: /* $KAME: mld6.c,v 1.25 2001/01/16 14:14:18 itojun Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1998 WIDE Project.
6: * All rights reserved.
1.13 itojun 7: *
1.2 itojun 8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
1.13 itojun 19: *
1.2 itojun 20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * Copyright (c) 1992, 1993
35: * The Regents of the University of California. All rights reserved.
36: *
37: * This code is derived from software contributed to Berkeley by
38: * Stephen Deering of Stanford University.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
1.23 agc 48: * 3. Neither the name of the University nor the names of its contributors
49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: *
64: * @(#)igmp.c 8.1 (Berkeley) 7/19/93
65: */
66:
67: /*
68: * Copyright (c) 1988 Stephen Deering.
69: *
70: * This code is derived from software contributed to Berkeley by
71: * Stephen Deering of Stanford University.
72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
1.2 itojun 81: * 3. All advertising materials mentioning features or use of this software
82: * must display the following acknowledgement:
83: * This product includes software developed by the University of
84: * California, Berkeley and its contributors.
85: * 4. Neither the name of the University nor the names of its contributors
86: * may be used to endorse or promote products derived from this software
87: * without specific prior written permission.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
90: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
93: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
94: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
95: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
97: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
98: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99: * SUCH DAMAGE.
100: *
101: * @(#)igmp.c 8.1 (Berkeley) 7/19/93
102: */
1.16 lukem 103:
104: #include <sys/cdefs.h>
1.28.2.1! yamt 105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.28 2005/12/11 12:25:02 christos Exp $");
1.2 itojun 106:
107: #include "opt_inet.h"
108:
109: #include <sys/param.h>
110: #include <sys/systm.h>
111: #include <sys/mbuf.h>
112: #include <sys/socket.h>
113: #include <sys/protosw.h>
114: #include <sys/syslog.h>
115:
116: #include <net/if.h>
117:
118: #include <netinet/in.h>
119: #include <netinet/in_var.h>
1.10 itojun 120: #include <netinet/ip6.h>
1.2 itojun 121: #include <netinet6/ip6_var.h>
1.28.2.1! yamt 122: #include <netinet6/scope6_var.h>
1.10 itojun 123: #include <netinet/icmp6.h>
1.2 itojun 124: #include <netinet6/mld6_var.h>
125:
1.7 itojun 126: #include <net/net_osdep.h>
127:
1.2 itojun 128: /*
129: * Protocol constants
130: */
131:
132: /* denotes that the MLD max response delay field specifies time in milliseconds */
1.22 itojun 133: #define MLD_TIMER_SCALE 1000
1.2 itojun 134: /*
135: * time between repetitions of a node's initial report of interest in a
136: * multicast address(in seconds)
137: */
1.22 itojun 138: #define MLD_UNSOLICITED_REPORT_INTERVAL 10
1.2 itojun 139:
140: static struct ip6_pktopts ip6_opts;
1.22 itojun 141: static int mld_timers_are_running;
1.2 itojun 142:
143: static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
144:
145: void
146: mld6_init()
147: {
148: static u_int8_t hbh_buf[8];
149: struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
150: u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
151:
1.22 itojun 152: mld_timers_are_running = 0;
1.2 itojun 153:
154: /* ip6h_nxt will be fill in later */
1.11 itojun 155: hbh->ip6h_len = 0; /* (8 >> 3) - 1 */
1.2 itojun 156:
157: /* XXX: grotty hard coding... */
158: hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */
159: hbh_buf[3] = 0;
160: hbh_buf[4] = IP6OPT_RTALERT;
161: hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
162: bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
163:
164: ip6_opts.ip6po_hbh = hbh;
165: /* We will specify the hoplimit by a multicast option. */
166: ip6_opts.ip6po_hlim = -1;
167: }
168:
169: void
170: mld6_start_listening(in6m)
171: struct in6_multi *in6m;
172: {
1.28.2.1! yamt 173: struct in6_addr all_in6;
! 174:
1.2 itojun 175: /*
1.11 itojun 176: * RFC2710 page 10:
1.2 itojun 177: * The node never sends a Report or Done for the link-scope all-nodes
178: * address.
179: * MLD messages are never sent for multicast addresses whose scope is 0
180: * (reserved) or 1 (node-local).
181: */
1.28.2.1! yamt 182: all_in6 = in6addr_linklocal_allnodes;
! 183: if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) {
! 184: /* XXX: this should not happen! */
! 185: in6m->in6m_timer = 0;
! 186: in6m->in6m_state = MLD_OTHERLISTENER;
! 187: }
! 188: if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.2 itojun 189: IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
190: in6m->in6m_timer = 0;
1.22 itojun 191: in6m->in6m_state = MLD_OTHERLISTENER;
1.2 itojun 192: } else {
1.22 itojun 193: mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
1.19 itojun 194: in6m->in6m_timer =
1.22 itojun 195: MLD_RANDOM_DELAY(MLD_UNSOLICITED_REPORT_INTERVAL *
1.19 itojun 196: PR_FASTHZ);
1.22 itojun 197: in6m->in6m_state = MLD_IREPORTEDLAST;
198: mld_timers_are_running = 1;
1.2 itojun 199: }
200: }
201:
202: void
203: mld6_stop_listening(in6m)
204: struct in6_multi *in6m;
205: {
1.28.2.1! yamt 206: struct in6_addr allnode, allrouter;
! 207:
! 208: allnode = in6addr_linklocal_allnodes;
! 209: if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) {
! 210: /* XXX: this should not happen! */
! 211: return;
! 212: }
! 213: allrouter = in6addr_linklocal_allrouters;
! 214: if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) {
! 215: /* XXX impossible */
! 216: return;
! 217: }
1.2 itojun 218:
1.22 itojun 219: if (in6m->in6m_state == MLD_IREPORTEDLAST &&
1.28.2.1! yamt 220: (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) &&
! 221: IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) >
! 222: IPV6_ADDR_SCOPE_INTFACELOCAL) {
! 223: mld6_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter);
! 224: }
1.2 itojun 225: }
226:
227: void
228: mld6_input(m, off)
229: struct mbuf *m;
230: int off;
231: {
232: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 233: struct mld_hdr *mldh;
1.2 itojun 234: struct ifnet *ifp = m->m_pkthdr.rcvif;
235: struct in6_multi *in6m;
1.28.2.1! yamt 236: struct in6_addr mld_addr, all_in6;
1.2 itojun 237: struct in6_ifaddr *ia;
238: int timer; /* timer value in the MLD query header */
239:
1.22 itojun 240: IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13 itojun 241: if (mldh == NULL) {
242: icmp6stat.icp6s_tooshort++;
243: return;
244: }
245:
1.2 itojun 246: /* source address validation */
1.13 itojun 247: ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2 itojun 248: if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.18 itojun 249: #if 0
1.2 itojun 250: log(LOG_ERR,
1.22 itojun 251: "mld_input: src %s is not link-local (grp=%s)\n",
1.13 itojun 252: ip6_sprintf(&ip6->ip6_src),
1.22 itojun 253: ip6_sprintf(&mldh->mld_addr));
1.18 itojun 254: #endif
1.2 itojun 255: /*
1.11 itojun 256: * spec (RFC2710) does not explicitly
1.2 itojun 257: * specify to discard the packet from a non link-local
258: * source address. But we believe it's expected to do so.
1.13 itojun 259: * XXX: do we have to allow :: as source?
1.2 itojun 260: */
1.11 itojun 261: m_freem(m);
1.2 itojun 262: return;
263: }
264:
265: /*
1.28.2.1! yamt 266: * make a copy for local work (in6_setscope() may modify the 1st arg)
! 267: */
! 268: mld_addr = mldh->mld_addr;
! 269: if (in6_setscope(&mld_addr, ifp, NULL)) {
! 270: /* XXX: this should not happen! */
! 271: m_free(m);
! 272: return;
! 273: }
! 274:
! 275: /*
1.2 itojun 276: * In the MLD6 specification, there are 3 states and a flag.
277: *
278: * In Non-Listener state, we simply don't have a membership record.
279: * In Delaying Listener state, our timer is running (in6m->in6m_timer)
280: * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
281: *
1.22 itojun 282: * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
283: * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2 itojun 284: * if we sent the last report.
285: */
1.22 itojun 286: switch (mldh->mld_type) {
287: case MLD_LISTENER_QUERY:
1.7 itojun 288: if (ifp->if_flags & IFF_LOOPBACK)
289: break;
290:
1.28.2.1! yamt 291: if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
! 292: !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7 itojun 293: break; /* print error or log stat? */
1.28.2.1! yamt 294:
! 295: all_in6 = in6addr_linklocal_allnodes;
! 296: if (in6_setscope(&all_in6, ifp, NULL)) {
! 297: /* XXX: this should not happen! */
! 298: break;
! 299: }
1.2 itojun 300:
1.7 itojun 301: /*
1.11 itojun 302: * - Start the timers in all of our membership records
303: * that the query applies to for the interface on
304: * which the query arrived excl. those that belong
305: * to the "all-nodes" group (ff02::1).
306: * - Restart any timer that is already running but has
307: * A value longer than the requested timeout.
308: * - Use the value specified in the query message as
309: * the maximum timeout.
310: */
1.7 itojun 311: IFP_TO_IA6(ifp, ia);
312: if (ia == NULL)
313: break;
1.2 itojun 314:
315: /*
1.11 itojun 316: * XXX: System timer resolution is too low to handle Max
317: * Response Delay, so set 1 to the internal timer even if
318: * the calculated value equals to zero when Max Response
319: * Delay is positive.
320: */
1.22 itojun 321: timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD_TIMER_SCALE;
322: if (timer == 0 && mldh->mld_maxdelay)
1.7 itojun 323: timer = 1;
1.20 itojun 324:
1.7 itojun 325: for (in6m = ia->ia6_multiaddrs.lh_first;
326: in6m;
327: in6m = in6m->in6m_entry.le_next)
328: {
1.28.2.1! yamt 329: if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7 itojun 330: IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
331: IPV6_ADDR_SCOPE_LINKLOCAL)
332: continue;
1.2 itojun 333:
1.28.2.1! yamt 334: if (IN6_IS_ADDR_UNSPECIFIED(&mld_addr) ||
! 335: IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) {
1.7 itojun 336: if (timer == 0) {
337: /* send a report immediately */
1.22 itojun 338: mld6_sendpkt(in6m, MLD_LISTENER_REPORT,
1.19 itojun 339: NULL);
1.7 itojun 340: in6m->in6m_timer = 0; /* reset timer */
1.22 itojun 341: in6m->in6m_state = MLD_IREPORTEDLAST;
1.7 itojun 342: }
343: else if (in6m->in6m_timer == 0 || /*idle state*/
1.19 itojun 344: in6m->in6m_timer > timer) {
1.7 itojun 345: in6m->in6m_timer =
1.22 itojun 346: MLD_RANDOM_DELAY(timer);
347: mld_timers_are_running = 1;
1.7 itojun 348: }
349: }
350: }
351: break;
1.28.2.1! yamt 352:
1.22 itojun 353: case MLD_LISTENER_REPORT:
1.2 itojun 354: /*
1.11 itojun 355: * For fast leave to work, we have to know that we are the
356: * last person to send a report for this group. Reports
357: * can potentially get looped back if we are a multicast
358: * router, so discard reports sourced by me.
359: * Note that it is impossible to check IFF_LOOPBACK flag of
360: * ifp for this purpose, since ip6_mloopback pass the physical
361: * interface to looutput.
362: */
1.7 itojun 363: if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
364: break;
365:
1.22 itojun 366: if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7 itojun 367: break;
368:
369: /*
1.11 itojun 370: * If we belong to the group being reported, stop
371: * our timer for that group.
372: */
1.28.2.1! yamt 373: IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7 itojun 374: if (in6m) {
375: in6m->in6m_timer = 0; /* transit to idle state */
1.22 itojun 376: in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7 itojun 377: }
378: break;
379: default: /* this is impossible */
1.18 itojun 380: #if 0
1.19 itojun 381: /*
382: * this case should be impossible because of filtering in
383: * icmp6_input(). But we explicitly disabled this part
384: * just in case.
385: */
1.22 itojun 386: log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld6_type);
1.18 itojun 387: #endif
1.7 itojun 388: break;
1.2 itojun 389: }
1.11 itojun 390:
391: m_freem(m);
1.2 itojun 392: }
393:
394: void
395: mld6_fasttimeo()
396: {
1.13 itojun 397: struct in6_multi *in6m;
1.2 itojun 398: struct in6_multistep step;
399: int s;
400: /*
401: * Quick check to see if any work needs to be done, in order
402: * to minimize the overhead of fasttimo processing.
403: */
1.22 itojun 404: if (!mld_timers_are_running)
1.2 itojun 405: return;
406:
1.4 itojun 407: s = splsoftnet();
1.22 itojun 408: mld_timers_are_running = 0;
1.2 itojun 409: IN6_FIRST_MULTI(step, in6m);
410: while (in6m != NULL) {
411: if (in6m->in6m_timer == 0) {
412: /* do nothing */
413: } else if (--in6m->in6m_timer == 0) {
1.22 itojun 414: mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
415: in6m->in6m_state = MLD_IREPORTEDLAST;
1.2 itojun 416: } else {
1.22 itojun 417: mld_timers_are_running = 1;
1.2 itojun 418: }
419: IN6_NEXT_MULTI(step, in6m);
420: }
421: splx(s);
422: }
423:
424: static void
425: mld6_sendpkt(in6m, type, dst)
426: struct in6_multi *in6m;
427: int type;
428: const struct in6_addr *dst;
429: {
430: struct mbuf *mh, *md;
1.22 itojun 431: struct mld_hdr *mldh;
1.2 itojun 432: struct ip6_hdr *ip6;
433: struct ip6_moptions im6o;
434: struct in6_ifaddr *ia;
435: struct ifnet *ifp = in6m->in6m_ifp;
1.19 itojun 436: int ignflags;
1.2 itojun 437:
438: /*
439: * At first, find a link local address on the outgoing interface
440: * to use as the source address of the MLD packet.
1.19 itojun 441: * We do not reject tentative addresses for MLD report to deal with
442: * the case where we first join a link-local address.
1.2 itojun 443: */
1.19 itojun 444: ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
445: if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2 itojun 446: return;
1.19 itojun 447: if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
448: ia = NULL;
1.2 itojun 449:
450: /*
451: * Allocate mbufs to store ip6 header and MLD header.
452: * We allocate 2 mbufs and make chain in advance because
453: * it is more convenient when inserting the hop-by-hop option later.
454: */
455: MGETHDR(mh, M_DONTWAIT, MT_HEADER);
456: if (mh == NULL)
457: return;
458: MGET(md, M_DONTWAIT, MT_DATA);
459: if (md == NULL) {
460: m_free(mh);
461: return;
462: }
463: mh->m_next = md;
464:
1.19 itojun 465: mh->m_pkthdr.rcvif = NULL;
1.22 itojun 466: mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
1.2 itojun 467: mh->m_len = sizeof(struct ip6_hdr);
468: MH_ALIGN(mh, sizeof(struct ip6_hdr));
469:
470: /* fill in the ip6 header */
471: ip6 = mtod(mh, struct ip6_hdr *);
472: ip6->ip6_flow = 0;
1.8 itojun 473: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
474: ip6->ip6_vfc |= IPV6_VERSION;
1.2 itojun 475: /* ip6_plen will be set later */
476: ip6->ip6_nxt = IPPROTO_ICMPV6;
477: /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
1.19 itojun 478: ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
1.2 itojun 479: ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
480:
481: /* fill in the MLD header */
1.22 itojun 482: md->m_len = sizeof(struct mld_hdr);
483: mldh = mtod(md, struct mld_hdr *);
484: mldh->mld_type = type;
485: mldh->mld_code = 0;
486: mldh->mld_cksum = 0;
1.2 itojun 487: /* XXX: we assume the function will not be called for query messages */
1.22 itojun 488: mldh->mld_maxdelay = 0;
489: mldh->mld_reserved = 0;
490: mldh->mld_addr = in6m->in6m_addr;
1.28.2.1! yamt 491: in6_clearscope(&mldh->mld_addr); /* XXX */
1.22 itojun 492: mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
493: sizeof(struct mld_hdr));
1.2 itojun 494:
495: /* construct multicast option */
496: bzero(&im6o, sizeof(im6o));
497: im6o.im6o_multicast_ifp = ifp;
498: im6o.im6o_multicast_hlim = 1;
499:
500: /*
501: * Request loopback of the report if we are acting as a multicast
502: * router, so that the process-level routing daemon can hear it.
503: */
504: im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
505:
506: /* increment output statictics */
507: icmp6stat.icp6s_outhist[type]++;
1.15 itojun 508: icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17 itojun 509: switch (type) {
1.22 itojun 510: case MLD_LISTENER_QUERY:
1.15 itojun 511: icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
512: break;
1.22 itojun 513: case MLD_LISTENER_REPORT:
1.15 itojun 514: icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
515: break;
1.22 itojun 516: case MLD_LISTENER_DONE:
1.15 itojun 517: icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
518: break;
1.7 itojun 519: }
1.19 itojun 520:
1.27 perry 521: ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.25 itojun 522: &im6o, (struct socket *)NULL, NULL);
1.2 itojun 523: }
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