Annotation of src/sys/netinet6/mld6.c, Revision 1.27
1.27 ! perry 1: /* $NetBSD: mld6.c,v 1.26 2004/03/28 08:28:50 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>
1.27 ! perry 105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.26 2004/03/28 08:28:50 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>
1.10 itojun 122: #include <netinet/icmp6.h>
1.2 itojun 123: #include <netinet6/mld6_var.h>
124:
1.7 itojun 125: #include <net/net_osdep.h>
126:
1.2 itojun 127: /*
128: * Protocol constants
129: */
130:
131: /* denotes that the MLD max response delay field specifies time in milliseconds */
1.22 itojun 132: #define MLD_TIMER_SCALE 1000
1.2 itojun 133: /*
134: * time between repetitions of a node's initial report of interest in a
135: * multicast address(in seconds)
136: */
1.22 itojun 137: #define MLD_UNSOLICITED_REPORT_INTERVAL 10
1.2 itojun 138:
139: static struct ip6_pktopts ip6_opts;
1.22 itojun 140: static int mld_timers_are_running;
1.2 itojun 141: /* XXX: These are necessary for KAME's link-local hack */
1.22 itojun 142: static struct in6_addr mld_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
143: static struct in6_addr mld_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1.2 itojun 144:
145: static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
146:
147: void
148: mld6_init()
149: {
150: static u_int8_t hbh_buf[8];
151: struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
152: u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
153:
1.22 itojun 154: mld_timers_are_running = 0;
1.2 itojun 155:
156: /* ip6h_nxt will be fill in later */
1.11 itojun 157: hbh->ip6h_len = 0; /* (8 >> 3) - 1 */
1.2 itojun 158:
159: /* XXX: grotty hard coding... */
160: hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */
161: hbh_buf[3] = 0;
162: hbh_buf[4] = IP6OPT_RTALERT;
163: hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
164: bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
165:
166: ip6_opts.ip6po_hbh = hbh;
167: /* We will specify the hoplimit by a multicast option. */
168: ip6_opts.ip6po_hlim = -1;
169: }
170:
171: void
172: mld6_start_listening(in6m)
173: struct in6_multi *in6m;
174: {
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: */
1.22 itojun 182: mld_all_nodes_linklocal.s6_addr16[1] =
1.19 itojun 183: htons(in6m->in6m_ifp->if_index); /* XXX */
1.22 itojun 184: if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld_all_nodes_linklocal) ||
1.2 itojun 185: IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
186: in6m->in6m_timer = 0;
1.22 itojun 187: in6m->in6m_state = MLD_OTHERLISTENER;
1.2 itojun 188: } else {
1.22 itojun 189: mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
1.19 itojun 190: in6m->in6m_timer =
1.22 itojun 191: MLD_RANDOM_DELAY(MLD_UNSOLICITED_REPORT_INTERVAL *
1.19 itojun 192: PR_FASTHZ);
1.22 itojun 193: in6m->in6m_state = MLD_IREPORTEDLAST;
194: mld_timers_are_running = 1;
1.2 itojun 195: }
196: }
197:
198: void
199: mld6_stop_listening(in6m)
200: struct in6_multi *in6m;
201: {
1.22 itojun 202: mld_all_nodes_linklocal.s6_addr16[1] =
1.19 itojun 203: htons(in6m->in6m_ifp->if_index); /* XXX */
1.22 itojun 204: mld_all_routers_linklocal.s6_addr16[1] =
1.19 itojun 205: htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
1.2 itojun 206:
1.22 itojun 207: if (in6m->in6m_state == MLD_IREPORTEDLAST &&
208: (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld_all_nodes_linklocal)) &&
1.2 itojun 209: IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
1.22 itojun 210: mld6_sendpkt(in6m, MLD_LISTENER_DONE,
211: &mld_all_routers_linklocal);
1.2 itojun 212: }
213:
214: void
215: mld6_input(m, off)
216: struct mbuf *m;
217: int off;
218: {
219: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 220: struct mld_hdr *mldh;
1.2 itojun 221: struct ifnet *ifp = m->m_pkthdr.rcvif;
222: struct in6_multi *in6m;
223: struct in6_ifaddr *ia;
224: int timer; /* timer value in the MLD query header */
225:
1.22 itojun 226: IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13 itojun 227: if (mldh == NULL) {
228: icmp6stat.icp6s_tooshort++;
229: return;
230: }
231:
1.2 itojun 232: /* source address validation */
1.13 itojun 233: ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2 itojun 234: if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.18 itojun 235: #if 0
1.2 itojun 236: log(LOG_ERR,
1.22 itojun 237: "mld_input: src %s is not link-local (grp=%s)\n",
1.13 itojun 238: ip6_sprintf(&ip6->ip6_src),
1.22 itojun 239: ip6_sprintf(&mldh->mld_addr));
1.18 itojun 240: #endif
1.2 itojun 241: /*
1.11 itojun 242: * spec (RFC2710) does not explicitly
1.2 itojun 243: * specify to discard the packet from a non link-local
244: * source address. But we believe it's expected to do so.
1.13 itojun 245: * XXX: do we have to allow :: as source?
1.2 itojun 246: */
1.11 itojun 247: m_freem(m);
1.2 itojun 248: return;
249: }
250:
251: /*
252: * In the MLD6 specification, there are 3 states and a flag.
253: *
254: * In Non-Listener state, we simply don't have a membership record.
255: * In Delaying Listener state, our timer is running (in6m->in6m_timer)
256: * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
257: *
1.22 itojun 258: * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
259: * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2 itojun 260: * if we sent the last report.
261: */
1.22 itojun 262: switch (mldh->mld_type) {
263: case MLD_LISTENER_QUERY:
1.7 itojun 264: if (ifp->if_flags & IFF_LOOPBACK)
265: break;
266:
1.22 itojun 267: if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) &&
268: !IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7 itojun 269: break; /* print error or log stat? */
1.22 itojun 270: if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
271: mldh->mld_addr.s6_addr16[1] =
1.19 itojun 272: htons(ifp->if_index); /* XXX */
1.2 itojun 273:
1.7 itojun 274: /*
1.11 itojun 275: * - Start the timers in all of our membership records
276: * that the query applies to for the interface on
277: * which the query arrived excl. those that belong
278: * to the "all-nodes" group (ff02::1).
279: * - Restart any timer that is already running but has
280: * A value longer than the requested timeout.
281: * - Use the value specified in the query message as
282: * the maximum timeout.
283: */
1.7 itojun 284: IFP_TO_IA6(ifp, ia);
285: if (ia == NULL)
286: break;
1.2 itojun 287:
288: /*
1.11 itojun 289: * XXX: System timer resolution is too low to handle Max
290: * Response Delay, so set 1 to the internal timer even if
291: * the calculated value equals to zero when Max Response
292: * Delay is positive.
293: */
1.22 itojun 294: timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD_TIMER_SCALE;
295: if (timer == 0 && mldh->mld_maxdelay)
1.7 itojun 296: timer = 1;
1.22 itojun 297: mld_all_nodes_linklocal.s6_addr16[1] =
1.7 itojun 298: htons(ifp->if_index); /* XXX */
1.20 itojun 299:
1.7 itojun 300: for (in6m = ia->ia6_multiaddrs.lh_first;
301: in6m;
302: in6m = in6m->in6m_entry.le_next)
303: {
304: if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
1.22 itojun 305: &mld_all_nodes_linklocal) ||
1.7 itojun 306: IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
307: IPV6_ADDR_SCOPE_LINKLOCAL)
308: continue;
1.2 itojun 309:
1.22 itojun 310: if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) ||
311: IN6_ARE_ADDR_EQUAL(&mldh->mld_addr,
1.7 itojun 312: &in6m->in6m_addr))
313: {
314: if (timer == 0) {
315: /* send a report immediately */
1.22 itojun 316: mld6_sendpkt(in6m, MLD_LISTENER_REPORT,
1.19 itojun 317: NULL);
1.7 itojun 318: in6m->in6m_timer = 0; /* reset timer */
1.22 itojun 319: in6m->in6m_state = MLD_IREPORTEDLAST;
1.7 itojun 320: }
321: else if (in6m->in6m_timer == 0 || /*idle state*/
1.19 itojun 322: in6m->in6m_timer > timer) {
1.7 itojun 323: in6m->in6m_timer =
1.22 itojun 324: MLD_RANDOM_DELAY(timer);
325: mld_timers_are_running = 1;
1.7 itojun 326: }
327: }
328: }
1.2 itojun 329:
1.22 itojun 330: if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
331: mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
1.7 itojun 332: break;
1.22 itojun 333: case MLD_LISTENER_REPORT:
1.2 itojun 334: /*
1.11 itojun 335: * For fast leave to work, we have to know that we are the
336: * last person to send a report for this group. Reports
337: * can potentially get looped back if we are a multicast
338: * router, so discard reports sourced by me.
339: * Note that it is impossible to check IFF_LOOPBACK flag of
340: * ifp for this purpose, since ip6_mloopback pass the physical
341: * interface to looutput.
342: */
1.7 itojun 343: if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
344: break;
345:
1.22 itojun 346: if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7 itojun 347: break;
348:
1.22 itojun 349: if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
350: mldh->mld_addr.s6_addr16[1] =
1.7 itojun 351: htons(ifp->if_index); /* XXX */
352: /*
1.11 itojun 353: * If we belong to the group being reported, stop
354: * our timer for that group.
355: */
1.22 itojun 356: IN6_LOOKUP_MULTI(mldh->mld_addr, ifp, in6m);
1.7 itojun 357: if (in6m) {
358: in6m->in6m_timer = 0; /* transit to idle state */
1.22 itojun 359: in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7 itojun 360: }
361:
1.22 itojun 362: if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
363: mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
1.7 itojun 364: break;
365: default: /* this is impossible */
1.18 itojun 366: #if 0
1.19 itojun 367: /*
368: * this case should be impossible because of filtering in
369: * icmp6_input(). But we explicitly disabled this part
370: * just in case.
371: */
1.22 itojun 372: log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld6_type);
1.18 itojun 373: #endif
1.7 itojun 374: break;
1.2 itojun 375: }
1.11 itojun 376:
377: m_freem(m);
1.2 itojun 378: }
379:
380: void
381: mld6_fasttimeo()
382: {
1.13 itojun 383: struct in6_multi *in6m;
1.2 itojun 384: struct in6_multistep step;
385: int s;
386: /*
387: * Quick check to see if any work needs to be done, in order
388: * to minimize the overhead of fasttimo processing.
389: */
1.22 itojun 390: if (!mld_timers_are_running)
1.2 itojun 391: return;
392:
1.4 itojun 393: s = splsoftnet();
1.22 itojun 394: mld_timers_are_running = 0;
1.2 itojun 395: IN6_FIRST_MULTI(step, in6m);
396: while (in6m != NULL) {
397: if (in6m->in6m_timer == 0) {
398: /* do nothing */
399: } else if (--in6m->in6m_timer == 0) {
1.22 itojun 400: mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
401: in6m->in6m_state = MLD_IREPORTEDLAST;
1.2 itojun 402: } else {
1.22 itojun 403: mld_timers_are_running = 1;
1.2 itojun 404: }
405: IN6_NEXT_MULTI(step, in6m);
406: }
407: splx(s);
408: }
409:
410: static void
411: mld6_sendpkt(in6m, type, dst)
412: struct in6_multi *in6m;
413: int type;
414: const struct in6_addr *dst;
415: {
416: struct mbuf *mh, *md;
1.22 itojun 417: struct mld_hdr *mldh;
1.2 itojun 418: struct ip6_hdr *ip6;
419: struct ip6_moptions im6o;
420: struct in6_ifaddr *ia;
421: struct ifnet *ifp = in6m->in6m_ifp;
1.19 itojun 422: int ignflags;
1.2 itojun 423:
424: /*
425: * At first, find a link local address on the outgoing interface
426: * to use as the source address of the MLD packet.
1.19 itojun 427: * We do not reject tentative addresses for MLD report to deal with
428: * the case where we first join a link-local address.
1.2 itojun 429: */
1.19 itojun 430: ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
431: if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2 itojun 432: return;
1.19 itojun 433: if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
434: ia = NULL;
1.2 itojun 435:
436: /*
437: * Allocate mbufs to store ip6 header and MLD header.
438: * We allocate 2 mbufs and make chain in advance because
439: * it is more convenient when inserting the hop-by-hop option later.
440: */
441: MGETHDR(mh, M_DONTWAIT, MT_HEADER);
442: if (mh == NULL)
443: return;
444: MGET(md, M_DONTWAIT, MT_DATA);
445: if (md == NULL) {
446: m_free(mh);
447: return;
448: }
449: mh->m_next = md;
450:
1.19 itojun 451: mh->m_pkthdr.rcvif = NULL;
1.22 itojun 452: mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
1.2 itojun 453: mh->m_len = sizeof(struct ip6_hdr);
454: MH_ALIGN(mh, sizeof(struct ip6_hdr));
455:
456: /* fill in the ip6 header */
457: ip6 = mtod(mh, struct ip6_hdr *);
458: ip6->ip6_flow = 0;
1.8 itojun 459: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
460: ip6->ip6_vfc |= IPV6_VERSION;
1.2 itojun 461: /* ip6_plen will be set later */
462: ip6->ip6_nxt = IPPROTO_ICMPV6;
463: /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
1.19 itojun 464: ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
1.2 itojun 465: ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
466:
467: /* fill in the MLD header */
1.22 itojun 468: md->m_len = sizeof(struct mld_hdr);
469: mldh = mtod(md, struct mld_hdr *);
470: mldh->mld_type = type;
471: mldh->mld_code = 0;
472: mldh->mld_cksum = 0;
1.2 itojun 473: /* XXX: we assume the function will not be called for query messages */
1.22 itojun 474: mldh->mld_maxdelay = 0;
475: mldh->mld_reserved = 0;
476: mldh->mld_addr = in6m->in6m_addr;
477: if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
478: mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
479: mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
480: sizeof(struct mld_hdr));
1.2 itojun 481:
482: /* construct multicast option */
483: bzero(&im6o, sizeof(im6o));
484: im6o.im6o_multicast_ifp = ifp;
485: im6o.im6o_multicast_hlim = 1;
486:
487: /*
488: * Request loopback of the report if we are acting as a multicast
489: * router, so that the process-level routing daemon can hear it.
490: */
491: im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
492:
493: /* increment output statictics */
494: icmp6stat.icp6s_outhist[type]++;
1.15 itojun 495: icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17 itojun 496: switch (type) {
1.22 itojun 497: case MLD_LISTENER_QUERY:
1.15 itojun 498: icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
499: break;
1.22 itojun 500: case MLD_LISTENER_REPORT:
1.15 itojun 501: icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
502: break;
1.22 itojun 503: case MLD_LISTENER_DONE:
1.15 itojun 504: icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
505: break;
1.7 itojun 506: }
1.19 itojun 507:
1.27 ! perry 508: ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.25 itojun 509: &im6o, (struct socket *)NULL, NULL);
1.2 itojun 510: }
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