1/* $FreeBSD: head/sys/netinet6/mld6.c 62587 2000-07-04 16:35:15Z itojun $ */ 2/* $KAME: mld6.c,v 1.19 2000/05/05 11:01:03 sumikawa Exp $ */ 3 |
4/* 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 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 --- 11 unchanged lines hidden (view full) --- 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) 1988 Stephen Deering. 35 * Copyright (c) 1992, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * This code is derived from software contributed to Berkeley by --- 25 unchanged lines hidden (view full) --- 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)igmp.c 8.1 (Berkeley) 7/19/93 70 */ 71 |
72#include "opt_inet.h" 73#include "opt_inet6.h" |
74 75#include <sys/param.h> 76#include <sys/systm.h> 77#include <sys/mbuf.h> 78#include <sys/socket.h> 79#include <sys/protosw.h> 80#include <sys/syslog.h> 81 82#include <net/if.h> 83 84#include <netinet/in.h> 85#include <netinet/in_var.h> |
86#include <netinet/ip6.h> |
87#include <netinet6/ip6_var.h> |
88#include |
89#include <netinet6/mld6_var.h> 90 91#include <net/net_osdep.h> 92 93/* 94 * Protocol constants 95 */ 96 97/* denotes that the MLD max response delay field specifies time in milliseconds */ |
98#define MLD6_TIMER_SCALE 1000 |
99/* 100 * time between repetitions of a node's initial report of interest in a 101 * multicast address(in seconds) 102 */ |
103#define MLD6_UNSOLICITED_REPORT_INTERVAL 10 |
104 |
105static struct ip6_pktopts ip6_opts; 106static int mld6_timers_are_running; |
107/* XXX: These are necessary for KAME's link-local hack */ |
108static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 109static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; |
110 |
111static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *)); |
112 113void 114mld6_init() 115{ 116 static u_int8_t hbh_buf[8]; 117 struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; 118 u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); 119 120 mld6_timers_are_running = 0; 121 122 /* ip6h_nxt will be fill in later */ |
123 hbh->ip6h_len = 0; /* (8 >> 3) - 1 */ |
124 125 /* XXX: grotty hard coding... */ 126 hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ 127 hbh_buf[3] = 0; 128 hbh_buf[4] = IP6OPT_RTALERT; 129 hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; 130 bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); 131 --- 4 unchanged lines hidden (view full) --- 136 137void 138mld6_start_listening(in6m) 139 struct in6_multi *in6m; 140{ 141 int s = splnet(); 142 143 /* |
144 * RFC2710 page 10: |
145 * The node never sends a Report or Done for the link-scope all-nodes 146 * address. 147 * MLD messages are never sent for multicast addresses whose scope is 0 148 * (reserved) or 1 (node-local). 149 */ 150 mld6_all_nodes_linklocal.s6_addr16[1] = 151 htons(in6m->in6m_ifp->if_index); /* XXX */ 152 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) || --- 27 unchanged lines hidden (view full) --- 180} 181 182void 183mld6_input(m, off) 184 struct mbuf *m; 185 int off; 186{ 187 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
188 struct mld6_hdr *mldh; |
189 struct ifnet *ifp = m->m_pkthdr.rcvif; 190 struct in6_multi *in6m; 191 struct in6_ifaddr *ia; 192 struct ifmultiaddr *ifma; 193 int timer; /* timer value in the MLD query header */ 194 195 /* source address validation */ 196 if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { 197 log(LOG_ERR, 198 "mld6_input: src %s is not link-local\n", 199 ip6_sprintf(&ip6->ip6_src)); 200 /* |
201 * spec (RFC2710) does not explicitly |
202 * specify to discard the packet from a non link-local 203 * source address. But we believe it's expected to do so. 204 */ |
205 m_freem(m); |
206 return; 207 } 208 |
209#ifndef PULLDOWN_TEST 210 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),); 211 mldh = (struct mld6_hdr *)(mtod(m, caddr_t) + off); 212#else 213 IP6_EXTHDR_GET(mldh, struct mld6_hdr *, m, off, sizeof(*mldh)); 214 if (mldh == NULL) { 215 icmp6stat.icp6s_tooshort++; 216 return; 217 } 218#endif 219 |
220 /* 221 * In the MLD6 specification, there are 3 states and a flag. 222 * 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) 226 * 227 * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if --- 8 unchanged lines hidden (view full) --- 236 if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) && 237 !IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr)) 238 break; /* print error or log stat? */ 239 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) 240 mldh->mld6_addr.s6_addr16[1] = 241 htons(ifp->if_index); /* XXX */ 242 243 /* |
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. 252 */ |
253 IFP_TO_IA6(ifp, ia); 254 if (ia == NULL) 255 break; 256 257 /* |
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 261 * Delay is positive. 262 */ |
263 timer = ntohs(mldh->mld6_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE; 264 if (timer == 0 && mldh->mld6_maxdelay) 265 timer = 1; 266 mld6_all_nodes_linklocal.s6_addr16[1] = 267 htons(ifp->if_index); /* XXX */ 268 269 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 270 { --- 11 unchanged lines hidden (view full) --- 282 &in6m->in6m_addr)) 283 { 284 if (timer == 0) { 285 /* send a report immediately */ 286 mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, 287 NULL); 288 in6m->in6m_timer = 0; /* reset timer */ 289 in6m->in6m_state = MLD6_IREPORTEDLAST; |
290 } 291 else if (in6m->in6m_timer == 0 || /*idle state*/ |
292 in6m->in6m_timer > timer) { 293 in6m->in6m_timer = 294 MLD6_RANDOM_DELAY(timer); 295 mld6_timers_are_running = 1; 296 } 297 } 298 } 299 300 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) 301 mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ 302 break; 303 case MLD6_LISTENER_REPORT: 304 /* |
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. 312 */ |
313 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 314 break; 315 316 if (!IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr)) 317 break; 318 319 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) 320 mldh->mld6_addr.s6_addr16[1] = 321 htons(ifp->if_index); /* XXX */ 322 /* |
323 * If we belong to the group being reported, stop 324 * our timer for that group. 325 */ |
326 IN6_LOOKUP_MULTI(mldh->mld6_addr, ifp, in6m); 327 if (in6m) { 328 in6m->in6m_timer = 0; /* transit to idle state */ 329 in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */ 330 } 331 332 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) 333 mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ 334 break; 335 default: /* this is impossible */ 336 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld6_type); 337 break; 338 } |
339 340 m_freem(m); |
341} 342 343void 344mld6_fasttimeo() 345{ 346 register struct in6_multi *in6m; 347 struct in6_multistep step; 348 int s; --- 35 unchanged lines hidden (view full) --- 384 struct in6_ifaddr *ia; 385 struct ifnet *ifp = in6m->in6m_ifp; 386 struct ifnet *outif = NULL; 387 388 /* 389 * At first, find a link local address on the outgoing interface 390 * to use as the source address of the MLD packet. 391 */ |
392 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 393 == NULL) |
394 return; 395 396 /* 397 * Allocate mbufs to store ip6 header and MLD header. 398 * We allocate 2 mbufs and make chain in advance because 399 * it is more convenient when inserting the hop-by-hop option later. 400 */ 401 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 402 if (mh == NULL) 403 return; 404 MGET(md, M_DONTWAIT, MT_DATA); 405 if (md == NULL) { 406 m_free(mh); 407 return; 408 } 409 mh->m_next = md; |
410 |
411 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld6_hdr); 412 mh->m_len = sizeof(struct ip6_hdr); 413 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 414 415 /* fill in the ip6 header */ 416 ip6 = mtod(mh, struct ip6_hdr *); 417 ip6->ip6_flow = 0; |
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; 425 426 /* fill in the MLD header */ 427 md->m_len = sizeof(struct mld6_hdr); --- 14 unchanged lines hidden (view full) --- 442 bzero(&im6o, sizeof(im6o)); 443 im6o.im6o_multicast_ifp = ifp; 444 im6o.im6o_multicast_hlim = 1; 445 446 /* 447 * Request loopback of the report if we are acting as a multicast 448 * router, so that the process-level routing daemon can hear it. 449 */ |
450 im6o.im6o_multicast_loop = (ip6_mrouter != NULL); |
451 452 /* increment output statictics */ 453 icmp6stat.icp6s_outhist[type]++; 454 455 ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif); 456 if (outif) { 457 icmp6_ifstat_inc(outif, ifs6_out_msg); 458 switch(type) { --- 12 unchanged lines hidden --- |