1139826Simp/*- 2191672Sbms * Copyright (c) 2009 Bruce Simpson. 353541Sshin * 453541Sshin * Redistribution and use in source and binary forms, with or without 553541Sshin * modification, are permitted provided that the following conditions 653541Sshin * are met: 753541Sshin * 1. Redistributions of source code must retain the above copyright 853541Sshin * notice, this list of conditions and the following disclaimer. 953541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1053541Sshin * notice, this list of conditions and the following disclaimer in the 1153541Sshin * documentation and/or other materials provided with the distribution. 12191672Sbms * 3. The name of the author may not be used to endorse or promote 13191672Sbms * products derived from this software without specific prior written 14191672Sbms * permission. 1553541Sshin * 16191672Sbms * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1753541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1853541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19191672Sbms * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2053541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2153541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2253541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2353541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2453541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2553541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2653541Sshin * SUCH DAMAGE. 27174510Sobrien * 28174510Sobrien * $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $ 2953541Sshin */ 3053541Sshin 31139826Simp/*- 3253541Sshin * Copyright (c) 1988 Stephen Deering. 3353541Sshin * Copyright (c) 1992, 1993 3453541Sshin * The Regents of the University of California. All rights reserved. 3553541Sshin * 3653541Sshin * This code is derived from software contributed to Berkeley by 3753541Sshin * Stephen Deering of Stanford University. 3853541Sshin * 3953541Sshin * Redistribution and use in source and binary forms, with or without 4053541Sshin * modification, are permitted provided that the following conditions 4153541Sshin * are met: 4253541Sshin * 1. Redistributions of source code must retain the above copyright 4353541Sshin * notice, this list of conditions and the following disclaimer. 4453541Sshin * 2. Redistributions in binary form must reproduce the above copyright 4553541Sshin * notice, this list of conditions and the following disclaimer in the 4653541Sshin * documentation and/or other materials provided with the distribution. 4753541Sshin * 4. Neither the name of the University nor the names of its contributors 4853541Sshin * may be used to endorse or promote products derived from this software 4953541Sshin * without specific prior written permission. 5053541Sshin * 5153541Sshin * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 5253541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 5353541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 5453541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 5553541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 5653541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 5753541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 5853541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 5953541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 6053541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6153541Sshin * SUCH DAMAGE. 6253541Sshin * 6353541Sshin * @(#)igmp.c 8.1 (Berkeley) 7/19/93 6453541Sshin */ 6553541Sshin 66174510Sobrien#include <sys/cdefs.h> 67174510Sobrien__FBSDID("$FreeBSD$"); 68174510Sobrien 6962587Sitojun#include "opt_inet.h" 7062587Sitojun#include "opt_inet6.h" 7155009Sshin 7253541Sshin#include <sys/param.h> 7353541Sshin#include <sys/systm.h> 7453541Sshin#include <sys/mbuf.h> 7553541Sshin#include <sys/socket.h> 7653541Sshin#include <sys/protosw.h> 77191672Sbms#include <sys/sysctl.h> 78151539Ssuz#include <sys/kernel.h> 79151539Ssuz#include <sys/callout.h> 80126603Sume#include <sys/malloc.h> 81191672Sbms#include <sys/module.h> 82200572Sbms#include <sys/ktr.h> 8353541Sshin 8453541Sshin#include <net/if.h> 85191672Sbms#include <net/route.h> 86191672Sbms#include <net/vnet.h> 8753541Sshin 8853541Sshin#include <netinet/in.h> 8953541Sshin#include <netinet/in_var.h> 90151539Ssuz#include <netinet6/in6_var.h> 9162587Sitojun#include <netinet/ip6.h> 9253541Sshin#include <netinet6/ip6_var.h> 93148385Sume#include <netinet6/scope6_var.h> 9462587Sitojun#include <netinet/icmp6.h> 95191672Sbms#include <netinet6/mld6.h> 9653541Sshin#include <netinet6/mld6_var.h> 9753541Sshin 98191672Sbms#include <security/mac/mac_framework.h> 99191672Sbms 100191672Sbms#ifndef KTR_MLD 101191672Sbms#define KTR_MLD KTR_INET6 102191672Sbms#endif 103191672Sbms 104191672Sbmsstatic struct mld_ifinfo * 105191672Sbms mli_alloc_locked(struct ifnet *); 106191672Sbmsstatic void mli_delete_locked(const struct ifnet *); 107191672Sbmsstatic void mld_dispatch_packet(struct mbuf *); 108191672Sbmsstatic void mld_dispatch_queue(struct ifqueue *, int); 109191672Sbmsstatic void mld_final_leave(struct in6_multi *, struct mld_ifinfo *); 110191672Sbmsstatic void mld_fasttimo_vnet(void); 111191672Sbmsstatic int mld_handle_state_change(struct in6_multi *, 112191672Sbms struct mld_ifinfo *); 113191672Sbmsstatic int mld_initial_join(struct in6_multi *, struct mld_ifinfo *, 114191672Sbms const int); 115191672Sbms#ifdef KTR 116191672Sbmsstatic char * mld_rec_type_to_str(const int); 117191672Sbms#endif 118191672Sbmsstatic void mld_set_version(struct mld_ifinfo *, const int); 119191672Sbmsstatic void mld_slowtimo_vnet(void); 120191672Sbmsstatic int mld_v1_input_query(struct ifnet *, const struct ip6_hdr *, 121192923Sbms /*const*/ struct mld_hdr *); 122191672Sbmsstatic int mld_v1_input_report(struct ifnet *, const struct ip6_hdr *, 123192923Sbms /*const*/ struct mld_hdr *); 124230076Sjhbstatic void mld_v1_process_group_timer(struct mld_ifinfo *, 125230076Sjhb struct in6_multi *); 126191672Sbmsstatic void mld_v1_process_querier_timers(struct mld_ifinfo *); 127191672Sbmsstatic int mld_v1_transmit_report(struct in6_multi *, const int); 128191672Sbmsstatic void mld_v1_update_group(struct in6_multi *, const int); 129191672Sbmsstatic void mld_v2_cancel_link_timers(struct mld_ifinfo *); 130191672Sbmsstatic void mld_v2_dispatch_general_query(struct mld_ifinfo *); 131191672Sbmsstatic struct mbuf * 132191672Sbms mld_v2_encap_report(struct ifnet *, struct mbuf *); 133191672Sbmsstatic int mld_v2_enqueue_filter_change(struct ifqueue *, 134191672Sbms struct in6_multi *); 135191672Sbmsstatic int mld_v2_enqueue_group_record(struct ifqueue *, 136200871Sbms struct in6_multi *, const int, const int, const int, 137200871Sbms const int); 138191672Sbmsstatic int mld_v2_input_query(struct ifnet *, const struct ip6_hdr *, 139191672Sbms struct mbuf *, const int, const int); 140191672Sbmsstatic int mld_v2_merge_state_changes(struct in6_multi *, 141191672Sbms struct ifqueue *); 142191672Sbmsstatic void mld_v2_process_group_timers(struct mld_ifinfo *, 143191672Sbms struct ifqueue *, struct ifqueue *, 144191672Sbms struct in6_multi *, const int); 145191672Sbmsstatic int mld_v2_process_group_query(struct in6_multi *, 146191672Sbms struct mld_ifinfo *mli, int, struct mbuf *, const int); 147191672Sbmsstatic int sysctl_mld_gsr(SYSCTL_HANDLER_ARGS); 148191672Sbmsstatic int sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS); 149191672Sbms 15053541Sshin/* 151191672Sbms * Normative references: RFC 2710, RFC 3590, RFC 3810. 152191672Sbms * 153191672Sbms * Locking: 154191672Sbms * * The MLD subsystem lock ends up being system-wide for the moment, 155191672Sbms * but could be per-VIMAGE later on. 156191672Sbms * * The permitted lock order is: IN6_MULTI_LOCK, MLD_LOCK, IF_ADDR_LOCK. 157191672Sbms * Any may be taken independently; if any are held at the same 158191672Sbms * time, the above lock order must be followed. 159191672Sbms * * IN6_MULTI_LOCK covers in_multi. 160191672Sbms * * MLD_LOCK covers per-link state and any global variables in this file. 161191672Sbms * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 162191672Sbms * per-link state iterators. 163191672Sbms * 164191672Sbms * XXX LOR PREVENTION 165191672Sbms * A special case for IPv6 is the in6_setscope() routine. ip6_output() 166191672Sbms * will not accept an ifp; it wants an embedded scope ID, unlike 167191672Sbms * ip_output(), which happily takes the ifp given to it. The embedded 168191672Sbms * scope ID is only used by MLD to select the outgoing interface. 169191672Sbms * 170191672Sbms * During interface attach and detach, MLD will take MLD_LOCK *after* 171191672Sbms * the IF_AFDATA_LOCK. 172191672Sbms * As in6_setscope() takes IF_AFDATA_LOCK then SCOPE_LOCK, we can't call 173191672Sbms * it with MLD_LOCK held without triggering an LOR. A netisr with indirect 174191672Sbms * dispatch could work around this, but we'd rather not do that, as it 175191672Sbms * can introduce other races. 176191672Sbms * 177191672Sbms * As such, we exploit the fact that the scope ID is just the interface 178191672Sbms * index, and embed it in the IPv6 destination address accordingly. 179191672Sbms * This is potentially NOT VALID for MLDv1 reports, as they 180191672Sbms * are always sent to the multicast group itself; as MLDv2 181191672Sbms * reports are always sent to ff02::16, this is not an issue 182191672Sbms * when MLDv2 is in use. 183191672Sbms * 184191672Sbms * This does not however eliminate the LOR when ip6_output() itself 185191672Sbms * calls in6_setscope() internally whilst MLD_LOCK is held. This will 186191672Sbms * trigger a LOR warning in WITNESS when the ifnet is detached. 187191672Sbms * 188191672Sbms * The right answer is probably to make IF_AFDATA_LOCK an rwlock, given 189191672Sbms * how it's used across the network stack. Here we're simply exploiting 190191672Sbms * the fact that MLD runs at a similar layer in the stack to scope6.c. 191191672Sbms * 192191672Sbms * VIMAGE: 193191672Sbms * * Each in6_multi corresponds to an ifp, and each ifp corresponds 194191672Sbms * to a vnet in ifp->if_vnet. 19553541Sshin */ 196191672Sbmsstatic struct mtx mld_mtx; 197249132Smavstatic MALLOC_DEFINE(M_MLD, "mld", "mld state"); 19853541Sshin 199206454Sbms#define MLD_EMBEDSCOPE(pin6, zoneid) \ 200206454Sbms if (IN6_IS_SCOPE_LINKLOCAL(pin6) || \ 201206454Sbms IN6_IS_ADDR_MC_INTFACELOCAL(pin6)) \ 202206454Sbms (pin6)->s6_addr16[1] = htons((zoneid) & 0xFFFF) \ 203191672Sbms 20453541Sshin/* 205191672Sbms * VIMAGE-wide globals. 20653541Sshin */ 207215701Sdimstatic VNET_DEFINE(struct timeval, mld_gsrdelay) = {10, 0}; 208215701Sdimstatic VNET_DEFINE(LIST_HEAD(, mld_ifinfo), mli_head); 209215701Sdimstatic VNET_DEFINE(int, interface_timers_running6); 210215701Sdimstatic VNET_DEFINE(int, state_change_timers_running6); 211215701Sdimstatic VNET_DEFINE(int, current_state_timers_running6); 21253541Sshin 213195727Srwatson#define V_mld_gsrdelay VNET(mld_gsrdelay) 214195727Srwatson#define V_mli_head VNET(mli_head) 215195727Srwatson#define V_interface_timers_running6 VNET(interface_timers_running6) 216195727Srwatson#define V_state_change_timers_running6 VNET(state_change_timers_running6) 217195727Srwatson#define V_current_state_timers_running6 VNET(current_state_timers_running6) 218195699Srwatson 219191672SbmsSYSCTL_DECL(_net_inet6); /* Note: Not in any common header. */ 22053541Sshin 221191672SbmsSYSCTL_NODE(_net_inet6, OID_AUTO, mld, CTLFLAG_RW, 0, 222191672Sbms "IPv6 Multicast Listener Discovery"); 223191672Sbms 224191672Sbms/* 225191672Sbms * Virtualized sysctls. 226191672Sbms */ 227195699SrwatsonSYSCTL_VNET_PROC(_net_inet6_mld, OID_AUTO, gsrdelay, 228195699Srwatson CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 229195699Srwatson &VNET_NAME(mld_gsrdelay.tv_sec), 0, sysctl_mld_gsr, "I", 230191672Sbms "Rate limit for MLDv2 Group-and-Source queries in seconds"); 231191672Sbms 232191672Sbms/* 233191672Sbms * Non-virtualized sysctls. 234191672Sbms */ 235248085Smariusstatic SYSCTL_NODE(_net_inet6_mld, OID_AUTO, ifinfo, 236248085Smarius CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_mld_ifinfo, 237248085Smarius "Per-interface MLDv2 state"); 238191672Sbms 239192923Sbmsstatic int mld_v1enable = 1; 240192923SbmsSYSCTL_INT(_net_inet6_mld, OID_AUTO, v1enable, CTLFLAG_RW, 241192923Sbms &mld_v1enable, 0, "Enable fallback to MLDv1"); 242192923SbmsTUNABLE_INT("net.inet6.mld.v1enable", &mld_v1enable); 243192923Sbms 244200871Sbmsstatic int mld_use_allow = 1; 245200871SbmsSYSCTL_INT(_net_inet6_mld, OID_AUTO, use_allow, CTLFLAG_RW, 246200871Sbms &mld_use_allow, 0, "Use ALLOW/BLOCK for RFC 4604 SSM joins/leaves"); 247200871SbmsTUNABLE_INT("net.inet6.mld.use_allow", &mld_use_allow); 248200871Sbms 249191672Sbms/* 250191672Sbms * Packed Router Alert option structure declaration. 251191672Sbms */ 252191672Sbmsstruct mld_raopt { 253191672Sbms struct ip6_hbh hbh; 254191672Sbms struct ip6_opt pad; 255191672Sbms struct ip6_opt_router ra; 256191672Sbms} __packed; 257191672Sbms 258191672Sbms/* 259191672Sbms * Router Alert hop-by-hop option header. 260191672Sbms */ 261191672Sbmsstatic struct mld_raopt mld_ra = { 262191672Sbms .hbh = { 0, 0 }, 263191672Sbms .pad = { .ip6o_type = IP6OPT_PADN, 0 }, 264191672Sbms .ra = { 265191672Sbms .ip6or_type = IP6OPT_ROUTER_ALERT, 266191672Sbms .ip6or_len = IP6OPT_RTALERT_LEN - 2, 267191672Sbms .ip6or_value[0] = ((IP6OPT_RTALERT_MLD >> 8) & 0xFF), 268191672Sbms .ip6or_value[1] = (IP6OPT_RTALERT_MLD & 0xFF) 269191672Sbms } 270191672Sbms}; 271191672Sbmsstatic struct ip6_pktopts mld_po; 272191672Sbms 273191672Sbmsstatic __inline void 274191672Sbmsmld_save_context(struct mbuf *m, struct ifnet *ifp) 27553541Sshin{ 276191672Sbms 277191672Sbms#ifdef VIMAGE 278191672Sbms m->m_pkthdr.header = ifp->if_vnet; 279191672Sbms#endif /* VIMAGE */ 280191672Sbms m->m_pkthdr.flowid = ifp->if_index; 281191672Sbms} 282191672Sbms 283191672Sbmsstatic __inline void 284191672Sbmsmld_scrub_context(struct mbuf *m) 285191672Sbms{ 286191672Sbms 287191672Sbms m->m_pkthdr.header = NULL; 288191672Sbms m->m_pkthdr.flowid = 0; 289191672Sbms} 290191672Sbms 291191672Sbms/* 292191672Sbms * Restore context from a queued output chain. 293191672Sbms * Return saved ifindex. 294191672Sbms * 295191672Sbms * VIMAGE: The assertion is there to make sure that we 296191672Sbms * actually called CURVNET_SET() with what's in the mbuf chain. 297191672Sbms */ 298191672Sbmsstatic __inline uint32_t 299191672Sbmsmld_restore_context(struct mbuf *m) 300191672Sbms{ 301191672Sbms 302191672Sbms#if defined(VIMAGE) && defined(INVARIANTS) 303191846Szec KASSERT(curvnet == m->m_pkthdr.header, 304191672Sbms ("%s: called when curvnet was not restored", __func__)); 305191672Sbms#endif 306191672Sbms return (m->m_pkthdr.flowid); 307191672Sbms} 308191672Sbms 309191672Sbms/* 310191672Sbms * Retrieve or set threshold between group-source queries in seconds. 311191672Sbms * 312191672Sbms * VIMAGE: Assume curvnet set by caller. 313191672Sbms * SMPng: NOTE: Serialized by MLD lock. 314191672Sbms */ 315191672Sbmsstatic int 316191672Sbmssysctl_mld_gsr(SYSCTL_HANDLER_ARGS) 317191672Sbms{ 318191672Sbms int error; 319191672Sbms int i; 32053541Sshin 321191672Sbms error = sysctl_wire_old_buffer(req, sizeof(int)); 322191672Sbms if (error) 323191672Sbms return (error); 32453541Sshin 325191672Sbms MLD_LOCK(); 32653541Sshin 327191672Sbms i = V_mld_gsrdelay.tv_sec; 328191672Sbms 329191672Sbms error = sysctl_handle_int(oidp, &i, 0, req); 330191672Sbms if (error || !req->newptr) 331191672Sbms goto out_locked; 332191672Sbms 333191672Sbms if (i < -1 || i >= 60) { 334191672Sbms error = EINVAL; 335191672Sbms goto out_locked; 336191672Sbms } 337191672Sbms 338191672Sbms CTR2(KTR_MLD, "change mld_gsrdelay from %d to %d", 339191672Sbms V_mld_gsrdelay.tv_sec, i); 340191672Sbms V_mld_gsrdelay.tv_sec = i; 341191672Sbms 342191672Sbmsout_locked: 343191672Sbms MLD_UNLOCK(); 344191672Sbms return (error); 34553541Sshin} 34653541Sshin 347191672Sbms/* 348191672Sbms * Expose struct mld_ifinfo to userland, keyed by ifindex. 349191672Sbms * For use by ifmcstat(8). 350191672Sbms * 351191672Sbms * SMPng: NOTE: Does an unlocked ifindex space read. 352191672Sbms * VIMAGE: Assume curvnet set by caller. The node handler itself 353191672Sbms * is not directly virtualized. 354191672Sbms */ 355191672Sbmsstatic int 356191672Sbmssysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS) 357151539Ssuz{ 358191672Sbms int *name; 359191672Sbms int error; 360191672Sbms u_int namelen; 361191672Sbms struct ifnet *ifp; 362191672Sbms struct mld_ifinfo *mli; 363151539Ssuz 364191672Sbms name = (int *)arg1; 365191672Sbms namelen = arg2; 366191672Sbms 367191672Sbms if (req->newptr != NULL) 368191672Sbms return (EPERM); 369191672Sbms 370191672Sbms if (namelen != 1) 371191672Sbms return (EINVAL); 372191672Sbms 373191672Sbms error = sysctl_wire_old_buffer(req, sizeof(struct mld_ifinfo)); 374191672Sbms if (error) 375191672Sbms return (error); 376191672Sbms 377191672Sbms IN6_MULTI_LOCK(); 378191672Sbms MLD_LOCK(); 379191672Sbms 380191672Sbms if (name[0] <= 0 || name[0] > V_if_index) { 381191672Sbms error = ENOENT; 382191672Sbms goto out_locked; 383151539Ssuz } 384151539Ssuz 385191672Sbms error = ENOENT; 386191672Sbms 387191672Sbms ifp = ifnet_byindex(name[0]); 388191672Sbms if (ifp == NULL) 389191672Sbms goto out_locked; 390191672Sbms 391191672Sbms LIST_FOREACH(mli, &V_mli_head, mli_link) { 392191672Sbms if (ifp == mli->mli_ifp) { 393191672Sbms error = SYSCTL_OUT(req, mli, 394191672Sbms sizeof(struct mld_ifinfo)); 395191672Sbms break; 396191672Sbms } 397191672Sbms } 398191672Sbms 399191672Sbmsout_locked: 400191672Sbms MLD_UNLOCK(); 401191672Sbms IN6_MULTI_UNLOCK(); 402191672Sbms return (error); 403151539Ssuz} 404151539Ssuz 405191672Sbms/* 406191672Sbms * Dispatch an entire queue of pending packet chains. 407191672Sbms * VIMAGE: Assumes the vnet pointer has been set. 408191672Sbms */ 409151539Ssuzstatic void 410191672Sbmsmld_dispatch_queue(struct ifqueue *ifq, int limit) 411151539Ssuz{ 412191672Sbms struct mbuf *m; 413151539Ssuz 414191672Sbms for (;;) { 415191672Sbms _IF_DEQUEUE(ifq, m); 416191672Sbms if (m == NULL) 417191672Sbms break; 418191672Sbms CTR3(KTR_MLD, "%s: dispatch %p from %p", __func__, ifq, m); 419191672Sbms mld_dispatch_packet(m); 420191672Sbms if (--limit == 0) 421191672Sbms break; 422191672Sbms } 423151539Ssuz} 424151539Ssuz 425191672Sbms/* 426191672Sbms * Filter outgoing MLD report state by group. 427191672Sbms * 428191672Sbms * Reports are ALWAYS suppressed for ALL-HOSTS (ff02::1) 429191672Sbms * and node-local addresses. However, kernel and socket consumers 430191672Sbms * always embed the KAME scope ID in the address provided, so strip it 431191672Sbms * when performing comparison. 432191672Sbms * Note: This is not the same as the *multicast* scope. 433191672Sbms * 434191672Sbms * Return zero if the given group is one for which MLD reports 435191672Sbms * should be suppressed, or non-zero if reports should be issued. 436191672Sbms */ 437191672Sbmsstatic __inline int 438191672Sbmsmld_is_addr_reported(const struct in6_addr *addr) 439151539Ssuz{ 440151539Ssuz 441191672Sbms KASSERT(IN6_IS_ADDR_MULTICAST(addr), ("%s: not multicast", __func__)); 442151539Ssuz 443191672Sbms if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_NODELOCAL) 444191672Sbms return (0); 445151539Ssuz 446191672Sbms if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_LINKLOCAL) { 447191672Sbms struct in6_addr tmp = *addr; 448191672Sbms in6_clearscope(&tmp); 449191672Sbms if (IN6_ARE_ADDR_EQUAL(&tmp, &in6addr_linklocal_allnodes)) 450191672Sbms return (0); 451151539Ssuz } 452151539Ssuz 453191672Sbms return (1); 454151539Ssuz} 455151539Ssuz 456191672Sbms/* 457191672Sbms * Attach MLD when PF_INET6 is attached to an interface. 458191672Sbms * 459191672Sbms * SMPng: Normally called with IF_AFDATA_LOCK held. 460191672Sbms */ 461191672Sbmsstruct mld_ifinfo * 462191672Sbmsmld_domifattach(struct ifnet *ifp) 463151539Ssuz{ 464191672Sbms struct mld_ifinfo *mli; 465151539Ssuz 466191672Sbms CTR3(KTR_MLD, "%s: called for ifp %p(%s)", 467191672Sbms __func__, ifp, ifp->if_xname); 468151539Ssuz 469191672Sbms MLD_LOCK(); 470191672Sbms 471191672Sbms mli = mli_alloc_locked(ifp); 472191672Sbms if (!(ifp->if_flags & IFF_MULTICAST)) 473191672Sbms mli->mli_flags |= MLIF_SILENT; 474200871Sbms if (mld_use_allow) 475200871Sbms mli->mli_flags |= MLIF_USEALLOW; 476191672Sbms 477191672Sbms MLD_UNLOCK(); 478191672Sbms 479191672Sbms return (mli); 480191672Sbms} 481191672Sbms 482191672Sbms/* 483191672Sbms * VIMAGE: assume curvnet set by caller. 484191672Sbms */ 485191672Sbmsstatic struct mld_ifinfo * 486191672Sbmsmli_alloc_locked(/*const*/ struct ifnet *ifp) 487191672Sbms{ 488191672Sbms struct mld_ifinfo *mli; 489191672Sbms 490191672Sbms MLD_LOCK_ASSERT(); 491191672Sbms 492191672Sbms mli = malloc(sizeof(struct mld_ifinfo), M_MLD, M_NOWAIT|M_ZERO); 493191672Sbms if (mli == NULL) 494191672Sbms goto out; 495191672Sbms 496191672Sbms mli->mli_ifp = ifp; 497191672Sbms mli->mli_version = MLD_VERSION_2; 498191672Sbms mli->mli_flags = 0; 499191672Sbms mli->mli_rv = MLD_RV_INIT; 500191672Sbms mli->mli_qi = MLD_QI_INIT; 501191672Sbms mli->mli_qri = MLD_QRI_INIT; 502191672Sbms mli->mli_uri = MLD_URI_INIT; 503191672Sbms 504191672Sbms SLIST_INIT(&mli->mli_relinmhead); 505191672Sbms 506191672Sbms /* 507191672Sbms * Responses to general queries are subject to bounds. 508191672Sbms */ 509191672Sbms IFQ_SET_MAXLEN(&mli->mli_gq, MLD_MAX_RESPONSE_PACKETS); 510191672Sbms 511191672Sbms LIST_INSERT_HEAD(&V_mli_head, mli, mli_link); 512191672Sbms 513191672Sbms CTR2(KTR_MLD, "allocate mld_ifinfo for ifp %p(%s)", 514191672Sbms ifp, ifp->if_xname); 515191672Sbms 516191672Sbmsout: 517191672Sbms return (mli); 518191672Sbms} 519191672Sbms 520191672Sbms/* 521191672Sbms * Hook for ifdetach. 522191672Sbms * 523191672Sbms * NOTE: Some finalization tasks need to run before the protocol domain 524191672Sbms * is detached, but also before the link layer does its cleanup. 525191672Sbms * Run before link-layer cleanup; cleanup groups, but do not free MLD state. 526191672Sbms * 527191672Sbms * SMPng: Caller must hold IN6_MULTI_LOCK(). 528191672Sbms * Must take IF_ADDR_LOCK() to cover if_multiaddrs iterator. 529191672Sbms * XXX This routine is also bitten by unlocked ifma_protospec access. 530191672Sbms */ 531191672Sbmsvoid 532191672Sbmsmld_ifdetach(struct ifnet *ifp) 533191672Sbms{ 534191672Sbms struct mld_ifinfo *mli; 535191672Sbms struct ifmultiaddr *ifma; 536191672Sbms struct in6_multi *inm, *tinm; 537191672Sbms 538191672Sbms CTR3(KTR_MLD, "%s: called for ifp %p(%s)", __func__, ifp, 539191672Sbms ifp->if_xname); 540191672Sbms 541191672Sbms IN6_MULTI_LOCK_ASSERT(); 542191672Sbms MLD_LOCK(); 543191672Sbms 544191672Sbms mli = MLD_IFINFO(ifp); 545191672Sbms if (mli->mli_version == MLD_VERSION_2) { 546233200Sjhb IF_ADDR_RLOCK(ifp); 547191672Sbms TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 548191672Sbms if (ifma->ifma_addr->sa_family != AF_INET6 || 549191672Sbms ifma->ifma_protospec == NULL) 550191672Sbms continue; 551191672Sbms inm = (struct in6_multi *)ifma->ifma_protospec; 552191672Sbms if (inm->in6m_state == MLD_LEAVING_MEMBER) { 553191672Sbms SLIST_INSERT_HEAD(&mli->mli_relinmhead, 554191672Sbms inm, in6m_nrele); 555191672Sbms } 556191672Sbms in6m_clear_recorded(inm); 557191672Sbms } 558233200Sjhb IF_ADDR_RUNLOCK(ifp); 559191672Sbms SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, in6m_nrele, 560191672Sbms tinm) { 561191672Sbms SLIST_REMOVE_HEAD(&mli->mli_relinmhead, in6m_nrele); 562191672Sbms in6m_release_locked(inm); 563191672Sbms } 564151539Ssuz } 565151539Ssuz 566191672Sbms MLD_UNLOCK(); 567151539Ssuz} 568151539Ssuz 569191672Sbms/* 570191672Sbms * Hook for domifdetach. 571191672Sbms * Runs after link-layer cleanup; free MLD state. 572191672Sbms * 573191672Sbms * SMPng: Normally called with IF_AFDATA_LOCK held. 574191672Sbms */ 57553541Sshinvoid 576191672Sbmsmld_domifdetach(struct ifnet *ifp) 57753541Sshin{ 57853541Sshin 579191672Sbms CTR3(KTR_MLD, "%s: called for ifp %p(%s)", 580191672Sbms __func__, ifp, ifp->if_xname); 581191672Sbms 582191672Sbms MLD_LOCK(); 583191672Sbms mli_delete_locked(ifp); 584191672Sbms MLD_UNLOCK(); 585191672Sbms} 586191672Sbms 587191672Sbmsstatic void 588191672Sbmsmli_delete_locked(const struct ifnet *ifp) 589191672Sbms{ 590191672Sbms struct mld_ifinfo *mli, *tmli; 591191672Sbms 592191672Sbms CTR3(KTR_MLD, "%s: freeing mld_ifinfo for ifp %p(%s)", 593191672Sbms __func__, ifp, ifp->if_xname); 594191672Sbms 595191672Sbms MLD_LOCK_ASSERT(); 596191672Sbms 597191672Sbms LIST_FOREACH_SAFE(mli, &V_mli_head, mli_link, tmli) { 598191672Sbms if (mli->mli_ifp == ifp) { 599191672Sbms /* 600191672Sbms * Free deferred General Query responses. 601191672Sbms */ 602191672Sbms _IF_DRAIN(&mli->mli_gq); 603191672Sbms 604191672Sbms LIST_REMOVE(mli, mli_link); 605191672Sbms 606191672Sbms KASSERT(SLIST_EMPTY(&mli->mli_relinmhead), 607191672Sbms ("%s: there are dangling in_multi references", 608191672Sbms __func__)); 609191672Sbms 610191672Sbms free(mli, M_MLD); 611191672Sbms return; 612191672Sbms } 613191672Sbms } 614191672Sbms#ifdef INVARIANTS 615191672Sbms panic("%s: mld_ifinfo not found for ifp %p\n", __func__, ifp); 616191672Sbms#endif 617191672Sbms} 618191672Sbms 619191672Sbms/* 620191672Sbms * Process a received MLDv1 general or address-specific query. 621191672Sbms * Assumes that the query header has been pulled up to sizeof(mld_hdr). 622192923Sbms * 623192923Sbms * NOTE: Can't be fully const correct as we temporarily embed scope ID in 624192923Sbms * mld_addr. This is OK as we own the mbuf chain. 625191672Sbms */ 626191672Sbmsstatic int 627191672Sbmsmld_v1_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6, 628192923Sbms /*const*/ struct mld_hdr *mld) 629191672Sbms{ 630191672Sbms struct ifmultiaddr *ifma; 631191672Sbms struct mld_ifinfo *mli; 632191672Sbms struct in6_multi *inm; 633192923Sbms int is_general_query; 634191672Sbms uint16_t timer; 635191672Sbms#ifdef KTR 636191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 637191672Sbms#endif 638191672Sbms 639192923Sbms is_general_query = 0; 640192923Sbms 641192923Sbms if (!mld_v1enable) { 642192923Sbms CTR3(KTR_MLD, "ignore v1 query %s on ifp %p(%s)", 643192923Sbms ip6_sprintf(ip6tbuf, &mld->mld_addr), 644192923Sbms ifp, ifp->if_xname); 645192923Sbms return (0); 646192923Sbms } 647192923Sbms 648192923Sbms /* 649192923Sbms * RFC3810 Section 6.2: MLD queries must originate from 650192923Sbms * a router's link-local address. 651192923Sbms */ 652192923Sbms if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 653192923Sbms CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)", 654192923Sbms ip6_sprintf(ip6tbuf, &ip6->ip6_src), 655192923Sbms ifp, ifp->if_xname); 656192923Sbms return (0); 657192923Sbms } 658192923Sbms 659192923Sbms /* 660192923Sbms * Do address field validation upfront before we accept 661192923Sbms * the query. 662192923Sbms */ 663192923Sbms if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) { 664192923Sbms /* 665192923Sbms * MLDv1 General Query. 666192923Sbms * If this was not sent to the all-nodes group, ignore it. 667192923Sbms */ 668192923Sbms struct in6_addr dst; 669192923Sbms 670192923Sbms dst = ip6->ip6_dst; 671192923Sbms in6_clearscope(&dst); 672192923Sbms if (!IN6_ARE_ADDR_EQUAL(&dst, &in6addr_linklocal_allnodes)) 673192923Sbms return (EINVAL); 674192923Sbms is_general_query = 1; 675192923Sbms } else { 676192923Sbms /* 677192923Sbms * Embed scope ID of receiving interface in MLD query for 678192923Sbms * lookup whilst we don't hold other locks. 679192923Sbms */ 680192923Sbms in6_setscope(&mld->mld_addr, ifp, NULL); 681192923Sbms } 682192923Sbms 683191672Sbms IN6_MULTI_LOCK(); 684192547Sbms MLD_LOCK(); 685191672Sbms 68653541Sshin /* 687191672Sbms * Switch to MLDv1 host compatibility mode. 68853541Sshin */ 689192923Sbms mli = MLD_IFINFO(ifp); 690192923Sbms KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp)); 691191672Sbms mld_set_version(mli, MLD_VERSION_1); 692191672Sbms 693192923Sbms timer = (ntohs(mld->mld_maxdelay) * PR_FASTHZ) / MLD_TIMER_SCALE; 694191672Sbms if (timer == 0) 695191672Sbms timer = 1; 696191672Sbms 697233200Sjhb IF_ADDR_RLOCK(ifp); 698192923Sbms if (is_general_query) { 699191672Sbms /* 700192923Sbms * For each reporting group joined on this 701192923Sbms * interface, kick the report timer. 702192923Sbms */ 703192923Sbms CTR2(KTR_MLD, "process v1 general query on ifp %p(%s)", 704192923Sbms ifp, ifp->if_xname); 705192923Sbms TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 706192923Sbms if (ifma->ifma_addr->sa_family != AF_INET6 || 707192923Sbms ifma->ifma_protospec == NULL) 708192923Sbms continue; 709192923Sbms inm = (struct in6_multi *)ifma->ifma_protospec; 710192923Sbms mld_v1_update_group(inm, timer); 711192923Sbms } 712192923Sbms } else { 713192923Sbms /* 714191672Sbms * MLDv1 Group-Specific Query. 715191672Sbms * If this is a group-specific MLDv1 query, we need only 716191672Sbms * look up the single group to process it. 717191672Sbms */ 718191672Sbms inm = in6m_lookup_locked(ifp, &mld->mld_addr); 719191672Sbms if (inm != NULL) { 720191672Sbms CTR3(KTR_MLD, "process v1 query %s on ifp %p(%s)", 721191672Sbms ip6_sprintf(ip6tbuf, &mld->mld_addr), 722191672Sbms ifp, ifp->if_xname); 723191672Sbms mld_v1_update_group(inm, timer); 724191672Sbms } 725192923Sbms /* XXX Clear embedded scope ID as userland won't expect it. */ 726192923Sbms in6_clearscope(&mld->mld_addr); 72753541Sshin } 728191672Sbms 729233200Sjhb IF_ADDR_RUNLOCK(ifp); 730191672Sbms MLD_UNLOCK(); 731191672Sbms IN6_MULTI_UNLOCK(); 732191672Sbms 733191672Sbms return (0); 73453541Sshin} 73553541Sshin 736191672Sbms/* 737191672Sbms * Update the report timer on a group in response to an MLDv1 query. 738191672Sbms * 739191672Sbms * If we are becoming the reporting member for this group, start the timer. 740191672Sbms * If we already are the reporting member for this group, and timer is 741191672Sbms * below the threshold, reset it. 742191672Sbms * 743191672Sbms * We may be updating the group for the first time since we switched 744191672Sbms * to MLDv2. If we are, then we must clear any recorded source lists, 745191672Sbms * and transition to REPORTING state; the group timer is overloaded 746191672Sbms * for group and group-source query responses. 747191672Sbms * 748191672Sbms * Unlike MLDv2, the delay per group should be jittered 749191672Sbms * to avoid bursts of MLDv1 reports. 750191672Sbms */ 751191672Sbmsstatic void 752191672Sbmsmld_v1_update_group(struct in6_multi *inm, const int timer) 75353541Sshin{ 754191672Sbms#ifdef KTR 755191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 756191672Sbms#endif 75753541Sshin 758191672Sbms CTR4(KTR_MLD, "%s: %s/%s timer=%d", __func__, 759191672Sbms ip6_sprintf(ip6tbuf, &inm->in6m_addr), 760191672Sbms inm->in6m_ifp->if_xname, timer); 761191672Sbms 762191672Sbms IN6_MULTI_LOCK_ASSERT(); 763191672Sbms 764191672Sbms switch (inm->in6m_state) { 765191672Sbms case MLD_NOT_MEMBER: 766191672Sbms case MLD_SILENT_MEMBER: 767191672Sbms break; 768191672Sbms case MLD_REPORTING_MEMBER: 769191672Sbms if (inm->in6m_timer != 0 && 770191672Sbms inm->in6m_timer <= timer) { 771191672Sbms CTR1(KTR_MLD, "%s: REPORTING and timer running, " 772191672Sbms "skipping.", __func__); 773191672Sbms break; 774191672Sbms } 775191672Sbms /* FALLTHROUGH */ 776191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 777191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 778191672Sbms case MLD_IDLE_MEMBER: 779191672Sbms case MLD_LAZY_MEMBER: 780191672Sbms case MLD_AWAKENING_MEMBER: 781191672Sbms CTR1(KTR_MLD, "%s: ->REPORTING", __func__); 782191672Sbms inm->in6m_state = MLD_REPORTING_MEMBER; 783191672Sbms inm->in6m_timer = MLD_RANDOM_DELAY(timer); 784191672Sbms V_current_state_timers_running6 = 1; 785191672Sbms break; 786191672Sbms case MLD_SLEEPING_MEMBER: 787191672Sbms CTR1(KTR_MLD, "%s: ->AWAKENING", __func__); 788191672Sbms inm->in6m_state = MLD_AWAKENING_MEMBER; 789191672Sbms break; 790191672Sbms case MLD_LEAVING_MEMBER: 791191672Sbms break; 792148385Sume } 79353541Sshin} 79453541Sshin 795191672Sbms/* 796191672Sbms * Process a received MLDv2 general, group-specific or 797191672Sbms * group-and-source-specific query. 798191672Sbms * 799191672Sbms * Assumes that the query header has been pulled up to sizeof(mldv2_query). 800191672Sbms * 801191672Sbms * Return 0 if successful, otherwise an appropriate error code is returned. 802191672Sbms */ 803191672Sbmsstatic int 804191672Sbmsmld_v2_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6, 805191672Sbms struct mbuf *m, const int off, const int icmp6len) 80653541Sshin{ 807191672Sbms struct mld_ifinfo *mli; 808191672Sbms struct mldv2_query *mld; 809191672Sbms struct in6_multi *inm; 810191672Sbms uint32_t maxdelay, nsrc, qqi; 811192923Sbms int is_general_query; 812191672Sbms uint16_t timer; 813191672Sbms uint8_t qrv; 814192923Sbms#ifdef KTR 815192923Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 816192923Sbms#endif 81753541Sshin 818192923Sbms is_general_query = 0; 819191672Sbms 820192923Sbms /* 821192923Sbms * RFC3810 Section 6.2: MLD queries must originate from 822192923Sbms * a router's link-local address. 823192923Sbms */ 824192923Sbms if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 825192923Sbms CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)", 826192923Sbms ip6_sprintf(ip6tbuf, &ip6->ip6_src), 827192923Sbms ifp, ifp->if_xname); 828192923Sbms return (0); 829192923Sbms } 830192923Sbms 831192923Sbms CTR2(KTR_MLD, "input v2 query on ifp %p(%s)", ifp, ifp->if_xname); 832192923Sbms 833191672Sbms mld = (struct mldv2_query *)(mtod(m, uint8_t *) + off); 834191672Sbms 835191672Sbms maxdelay = ntohs(mld->mld_maxdelay); /* in 1/10ths of a second */ 836237992Sbms if (maxdelay >= 32768) { 837192923Sbms maxdelay = (MLD_MRC_MANT(maxdelay) | 0x1000) << 838192923Sbms (MLD_MRC_EXP(maxdelay) + 3); 83978064Sume } 840192923Sbms timer = (maxdelay * PR_FASTHZ) / MLD_TIMER_SCALE; 841192923Sbms if (timer == 0) 842192923Sbms timer = 1; 84378064Sume 844191672Sbms qrv = MLD_QRV(mld->mld_misc); 845191672Sbms if (qrv < 2) { 846191672Sbms CTR3(KTR_MLD, "%s: clamping qrv %d to %d", __func__, 847191672Sbms qrv, MLD_RV_INIT); 848191672Sbms qrv = MLD_RV_INIT; 849191672Sbms } 850191672Sbms 851191672Sbms qqi = mld->mld_qqi; 852191672Sbms if (qqi >= 128) { 853191672Sbms qqi = MLD_QQIC_MANT(mld->mld_qqi) << 854191672Sbms (MLD_QQIC_EXP(mld->mld_qqi) + 3); 855191672Sbms } 856191672Sbms 857191672Sbms nsrc = ntohs(mld->mld_numsrc); 858191672Sbms if (nsrc > MLD_MAX_GS_SOURCES) 859191672Sbms return (EMSGSIZE); 860191672Sbms if (icmp6len < sizeof(struct mldv2_query) + 861191672Sbms (nsrc * sizeof(struct in6_addr))) 862191672Sbms return (EMSGSIZE); 863191672Sbms 864192923Sbms /* 865192923Sbms * Do further input validation upfront to avoid resetting timers 866192923Sbms * should we need to discard this query. 867192923Sbms */ 868192923Sbms if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) { 869192923Sbms /* 870192923Sbms * A general query with a source list has undefined 871192923Sbms * behaviour; discard it. 872192923Sbms */ 873237990Sbms if (nsrc > 0) 874192923Sbms return (EINVAL); 875192923Sbms is_general_query = 1; 876192923Sbms } else { 877192923Sbms /* 878192923Sbms * Embed scope ID of receiving interface in MLD query for 879192923Sbms * lookup whilst we don't hold other locks (due to KAME 880192923Sbms * locking lameness). We own this mbuf chain just now. 881192923Sbms */ 882192923Sbms in6_setscope(&mld->mld_addr, ifp, NULL); 883192923Sbms } 884192923Sbms 885191672Sbms IN6_MULTI_LOCK(); 886192547Sbms MLD_LOCK(); 887191672Sbms 888191672Sbms mli = MLD_IFINFO(ifp); 889191672Sbms KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp)); 890191672Sbms 891192923Sbms /* 892192923Sbms * Discard the v2 query if we're in Compatibility Mode. 893192923Sbms * The RFC is pretty clear that hosts need to stay in MLDv1 mode 894192923Sbms * until the Old Version Querier Present timer expires. 895192923Sbms */ 896192923Sbms if (mli->mli_version != MLD_VERSION_2) 897192923Sbms goto out_locked; 898192923Sbms 899191672Sbms mld_set_version(mli, MLD_VERSION_2); 900191672Sbms mli->mli_rv = qrv; 901191672Sbms mli->mli_qi = qqi; 902191672Sbms mli->mli_qri = maxdelay; 903191672Sbms 904192547Sbms CTR4(KTR_MLD, "%s: qrv %d qi %d maxdelay %d", __func__, qrv, qqi, 905191672Sbms maxdelay); 906191672Sbms 907192923Sbms if (is_general_query) { 90853541Sshin /* 909191672Sbms * MLDv2 General Query. 910192547Sbms * 911191672Sbms * Schedule a current-state report on this ifp for 912191672Sbms * all groups, possibly containing source lists. 913192547Sbms * 914191672Sbms * If there is a pending General Query response 915191672Sbms * scheduled earlier than the selected delay, do 916191672Sbms * not schedule any other reports. 917191672Sbms * Otherwise, reset the interface timer. 918191672Sbms */ 919192923Sbms CTR2(KTR_MLD, "process v2 general query on ifp %p(%s)", 920192923Sbms ifp, ifp->if_xname); 921192562Sbms if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer) { 922192562Sbms mli->mli_v2_timer = MLD_RANDOM_DELAY(timer); 923191672Sbms V_interface_timers_running6 = 1; 924191672Sbms } 925191672Sbms } else { 926191672Sbms /* 927191672Sbms * MLDv2 Group-specific or Group-and-source-specific Query. 928191672Sbms * 929191672Sbms * Group-source-specific queries are throttled on 930191672Sbms * a per-group basis to defeat denial-of-service attempts. 931191672Sbms * Queries for groups we are not a member of on this 932191672Sbms * link are simply ignored. 933191672Sbms */ 934233200Sjhb IF_ADDR_RLOCK(ifp); 935191672Sbms inm = in6m_lookup_locked(ifp, &mld->mld_addr); 936225096Spluknet if (inm == NULL) { 937233200Sjhb IF_ADDR_RUNLOCK(ifp); 938191672Sbms goto out_locked; 939225096Spluknet } 940191672Sbms if (nsrc > 0) { 941191672Sbms if (!ratecheck(&inm->in6m_lastgsrtv, 942191672Sbms &V_mld_gsrdelay)) { 943191672Sbms CTR1(KTR_MLD, "%s: GS query throttled.", 944191672Sbms __func__); 945233200Sjhb IF_ADDR_RUNLOCK(ifp); 946191672Sbms goto out_locked; 947191672Sbms } 948191672Sbms } 949191672Sbms CTR2(KTR_MLD, "process v2 group query on ifp %p(%s)", 950191672Sbms ifp, ifp->if_xname); 951191672Sbms /* 952191672Sbms * If there is a pending General Query response 953191672Sbms * scheduled sooner than the selected delay, no 954191672Sbms * further report need be scheduled. 955191672Sbms * Otherwise, prepare to respond to the 956191672Sbms * group-specific or group-and-source query. 957191672Sbms */ 958192562Sbms if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer) 959191672Sbms mld_v2_process_group_query(inm, mli, timer, m, off); 960192923Sbms 961192923Sbms /* XXX Clear embedded scope ID as userland won't expect it. */ 962192923Sbms in6_clearscope(&mld->mld_addr); 963233200Sjhb IF_ADDR_RUNLOCK(ifp); 96453541Sshin } 96553541Sshin 966191672Sbmsout_locked: 967191672Sbms MLD_UNLOCK(); 968191672Sbms IN6_MULTI_UNLOCK(); 969191672Sbms 970191672Sbms return (0); 971191672Sbms} 972191672Sbms 973191672Sbms/* 974191672Sbms * Process a recieved MLDv2 group-specific or group-and-source-specific 975191672Sbms * query. 976191672Sbms * Return <0 if any error occured. Currently this is ignored. 977191672Sbms */ 978191672Sbmsstatic int 979191672Sbmsmld_v2_process_group_query(struct in6_multi *inm, struct mld_ifinfo *mli, 980191672Sbms int timer, struct mbuf *m0, const int off) 981191672Sbms{ 982191672Sbms struct mldv2_query *mld; 983191672Sbms int retval; 984191672Sbms uint16_t nsrc; 985191672Sbms 986191672Sbms IN6_MULTI_LOCK_ASSERT(); 987191672Sbms MLD_LOCK_ASSERT(); 988191672Sbms 989191672Sbms retval = 0; 990191672Sbms mld = (struct mldv2_query *)(mtod(m0, uint8_t *) + off); 991191672Sbms 992191672Sbms switch (inm->in6m_state) { 993191672Sbms case MLD_NOT_MEMBER: 994191672Sbms case MLD_SILENT_MEMBER: 995191672Sbms case MLD_SLEEPING_MEMBER: 996191672Sbms case MLD_LAZY_MEMBER: 997191672Sbms case MLD_AWAKENING_MEMBER: 998191672Sbms case MLD_IDLE_MEMBER: 999191672Sbms case MLD_LEAVING_MEMBER: 1000191672Sbms return (retval); 1001191672Sbms break; 1002191672Sbms case MLD_REPORTING_MEMBER: 1003191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 1004191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 1005191672Sbms break; 1006191672Sbms } 1007191672Sbms 1008191672Sbms nsrc = ntohs(mld->mld_numsrc); 1009191672Sbms 101053541Sshin /* 1011191672Sbms * Deal with group-specific queries upfront. 1012191672Sbms * If any group query is already pending, purge any recorded 1013191672Sbms * source-list state if it exists, and schedule a query response 1014191672Sbms * for this group-specific query. 1015148385Sume */ 1016191672Sbms if (nsrc == 0) { 1017191672Sbms if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER || 1018191672Sbms inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER) { 1019191672Sbms in6m_clear_recorded(inm); 1020191672Sbms timer = min(inm->in6m_timer, timer); 1021191672Sbms } 1022191672Sbms inm->in6m_state = MLD_G_QUERY_PENDING_MEMBER; 1023191672Sbms inm->in6m_timer = MLD_RANDOM_DELAY(timer); 1024191672Sbms V_current_state_timers_running6 = 1; 1025191672Sbms return (retval); 1026148385Sume } 1027148385Sume 1028148385Sume /* 1029191672Sbms * Deal with the case where a group-and-source-specific query has 1030191672Sbms * been received but a group-specific query is already pending. 103153541Sshin */ 1032191672Sbms if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER) { 1033191672Sbms timer = min(inm->in6m_timer, timer); 1034191672Sbms inm->in6m_timer = MLD_RANDOM_DELAY(timer); 1035191672Sbms V_current_state_timers_running6 = 1; 1036191672Sbms return (retval); 1037191672Sbms } 103853541Sshin 1039191672Sbms /* 1040191672Sbms * Finally, deal with the case where a group-and-source-specific 1041191672Sbms * query has been received, where a response to a previous g-s-r 1042191672Sbms * query exists, or none exists. 1043191672Sbms * In this case, we need to parse the source-list which the Querier 1044191672Sbms * has provided us with and check if we have any source list filter 1045191672Sbms * entries at T1 for these sources. If we do not, there is no need 1046191672Sbms * schedule a report and the query may be dropped. 1047191672Sbms * If we do, we must record them and schedule a current-state 1048191672Sbms * report for those sources. 1049191672Sbms */ 1050191672Sbms if (inm->in6m_nsrc > 0) { 1051191672Sbms struct mbuf *m; 1052191672Sbms uint8_t *sp; 1053191672Sbms int i, nrecorded; 1054191672Sbms int soff; 105553541Sshin 1056191672Sbms m = m0; 1057191672Sbms soff = off + sizeof(struct mldv2_query); 1058191672Sbms nrecorded = 0; 1059191672Sbms for (i = 0; i < nsrc; i++) { 1060191672Sbms sp = mtod(m, uint8_t *) + soff; 1061191672Sbms retval = in6m_record_source(inm, 1062191672Sbms (const struct in6_addr *)sp); 1063191672Sbms if (retval < 0) 1064191672Sbms break; 1065191672Sbms nrecorded += retval; 1066191672Sbms soff += sizeof(struct in6_addr); 1067191672Sbms if (soff >= m->m_len) { 1068191672Sbms soff = soff - m->m_len; 1069191672Sbms m = m->m_next; 1070191672Sbms if (m == NULL) 1071191672Sbms break; 1072191672Sbms } 1073148385Sume } 1074191672Sbms if (nrecorded > 0) { 1075191672Sbms CTR1(KTR_MLD, 1076191672Sbms "%s: schedule response to SG query", __func__); 1077191672Sbms inm->in6m_state = MLD_SG_QUERY_PENDING_MEMBER; 1078191672Sbms inm->in6m_timer = MLD_RANDOM_DELAY(timer); 1079191672Sbms V_current_state_timers_running6 = 1; 1080191672Sbms } 1081191672Sbms } 1082148385Sume 1083191672Sbms return (retval); 1084191672Sbms} 1085191672Sbms 1086191672Sbms/* 1087191672Sbms * Process a received MLDv1 host membership report. 1088191672Sbms * Assumes mld points to mld_hdr in pulled up mbuf chain. 1089192923Sbms * 1090192923Sbms * NOTE: Can't be fully const correct as we temporarily embed scope ID in 1091192923Sbms * mld_addr. This is OK as we own the mbuf chain. 1092191672Sbms */ 1093191672Sbmsstatic int 1094191672Sbmsmld_v1_input_report(struct ifnet *ifp, const struct ip6_hdr *ip6, 1095192923Sbms /*const*/ struct mld_hdr *mld) 1096191672Sbms{ 1097192923Sbms struct in6_addr src, dst; 1098191672Sbms struct in6_ifaddr *ia; 1099191672Sbms struct in6_multi *inm; 1100191672Sbms#ifdef KTR 1101191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 1102191672Sbms#endif 1103191672Sbms 1104192923Sbms if (!mld_v1enable) { 1105192923Sbms CTR3(KTR_MLD, "ignore v1 report %s on ifp %p(%s)", 1106192923Sbms ip6_sprintf(ip6tbuf, &mld->mld_addr), 1107192923Sbms ifp, ifp->if_xname); 1108192923Sbms return (0); 1109192923Sbms } 1110192923Sbms 1111191672Sbms if (ifp->if_flags & IFF_LOOPBACK) 1112191672Sbms return (0); 1113192923Sbms 1114192923Sbms /* 1115192923Sbms * MLDv1 reports must originate from a host's link-local address, 1116192923Sbms * or the unspecified address (when booting). 1117192923Sbms */ 1118192923Sbms src = ip6->ip6_src; 1119192923Sbms in6_clearscope(&src); 1120192923Sbms if (!IN6_IS_SCOPE_LINKLOCAL(&src) && !IN6_IS_ADDR_UNSPECIFIED(&src)) { 1121192923Sbms CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)", 1122192923Sbms ip6_sprintf(ip6tbuf, &ip6->ip6_src), 1123192923Sbms ifp, ifp->if_xname); 1124192547Sbms return (EINVAL); 1125192923Sbms } 1126191672Sbms 1127192923Sbms /* 1128192923Sbms * RFC2710 Section 4: MLDv1 reports must pertain to a multicast 1129192923Sbms * group, and must be directed to the group itself. 1130192923Sbms */ 1131192547Sbms dst = ip6->ip6_dst; 1132192547Sbms in6_clearscope(&dst); 1133192923Sbms if (!IN6_IS_ADDR_MULTICAST(&mld->mld_addr) || 1134192923Sbms !IN6_ARE_ADDR_EQUAL(&mld->mld_addr, &dst)) { 1135192923Sbms CTR3(KTR_MLD, "ignore v1 query dst %s on ifp %p(%s)", 1136192923Sbms ip6_sprintf(ip6tbuf, &ip6->ip6_dst), 1137192923Sbms ifp, ifp->if_xname); 1138191672Sbms return (EINVAL); 1139192923Sbms } 1140191672Sbms 1141191672Sbms /* 1142191672Sbms * Make sure we don't hear our own membership report, as fast 1143191672Sbms * leave requires knowing that we are the only member of a 1144191672Sbms * group. Assume we used the link-local address if available, 1145191672Sbms * otherwise look for ::. 1146192547Sbms * 1147192547Sbms * XXX Note that scope ID comparison is needed for the address 1148192547Sbms * returned by in6ifa_ifpforlinklocal(), but SHOULD NOT be 1149192547Sbms * performed for the on-wire address. 1150191672Sbms */ 1151191672Sbms ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 1152191672Sbms if ((ia && IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, IA6_IN6(ia))) || 1153194760Srwatson (ia == NULL && IN6_IS_ADDR_UNSPECIFIED(&src))) { 1154194760Srwatson if (ia != NULL) 1155194760Srwatson ifa_free(&ia->ia_ifa); 1156191672Sbms return (0); 1157194760Srwatson } 1158194760Srwatson if (ia != NULL) 1159194760Srwatson ifa_free(&ia->ia_ifa); 1160191672Sbms 1161191672Sbms CTR3(KTR_MLD, "process v1 report %s on ifp %p(%s)", 1162191672Sbms ip6_sprintf(ip6tbuf, &mld->mld_addr), ifp, ifp->if_xname); 1163191672Sbms 1164192923Sbms /* 1165192923Sbms * Embed scope ID of receiving interface in MLD query for lookup 1166192923Sbms * whilst we don't hold other locks (due to KAME locking lameness). 1167192923Sbms */ 1168192923Sbms if (!IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) 1169192923Sbms in6_setscope(&mld->mld_addr, ifp, NULL); 1170192923Sbms 1171191672Sbms IN6_MULTI_LOCK(); 1172192547Sbms MLD_LOCK(); 1173233200Sjhb IF_ADDR_RLOCK(ifp); 1174191672Sbms 1175191672Sbms /* 1176191672Sbms * MLDv1 report suppression. 1177191672Sbms * If we are a member of this group, and our membership should be 1178191672Sbms * reported, and our group timer is pending or about to be reset, 1179191672Sbms * stop our group timer by transitioning to the 'lazy' state. 1180191672Sbms */ 1181191672Sbms inm = in6m_lookup_locked(ifp, &mld->mld_addr); 1182191672Sbms if (inm != NULL) { 1183191672Sbms struct mld_ifinfo *mli; 1184191672Sbms 1185191672Sbms mli = inm->in6m_mli; 1186191672Sbms KASSERT(mli != NULL, 1187191672Sbms ("%s: no mli for ifp %p", __func__, ifp)); 1188191672Sbms 118953541Sshin /* 1190191672Sbms * If we are in MLDv2 host mode, do not allow the 1191191672Sbms * other host's MLDv1 report to suppress our reports. 119262587Sitojun */ 1193191672Sbms if (mli->mli_version == MLD_VERSION_2) 1194191672Sbms goto out_locked; 1195151539Ssuz 1196191672Sbms inm->in6m_timer = 0; 1197191672Sbms 1198191672Sbms switch (inm->in6m_state) { 1199191672Sbms case MLD_NOT_MEMBER: 1200191672Sbms case MLD_SILENT_MEMBER: 1201191672Sbms case MLD_SLEEPING_MEMBER: 120253541Sshin break; 1203191672Sbms case MLD_REPORTING_MEMBER: 1204191672Sbms case MLD_IDLE_MEMBER: 1205191672Sbms case MLD_AWAKENING_MEMBER: 1206191672Sbms CTR3(KTR_MLD, 1207191672Sbms "report suppressed for %s on ifp %p(%s)", 1208191672Sbms ip6_sprintf(ip6tbuf, &mld->mld_addr), 1209191672Sbms ifp, ifp->if_xname); 1210191672Sbms case MLD_LAZY_MEMBER: 1211191672Sbms inm->in6m_state = MLD_LAZY_MEMBER; 1212191672Sbms break; 1213191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 1214191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 1215191672Sbms case MLD_LEAVING_MEMBER: 1216191672Sbms break; 1217191341Srwatson } 1218191672Sbms } 121953541Sshin 1220191672Sbmsout_locked: 1221233200Sjhb IF_ADDR_RUNLOCK(ifp); 1222192547Sbms MLD_UNLOCK(); 1223191672Sbms IN6_MULTI_UNLOCK(); 1224120941Sume 1225192923Sbms /* XXX Clear embedded scope ID as userland won't expect it. */ 1226192923Sbms in6_clearscope(&mld->mld_addr); 1227192923Sbms 1228191672Sbms return (0); 1229191672Sbms} 1230120941Sume 1231191672Sbms/* 1232191672Sbms * MLD input path. 1233191672Sbms * 1234191672Sbms * Assume query messages which fit in a single ICMPv6 message header 1235191672Sbms * have been pulled up. 1236191672Sbms * Assume that userland will want to see the message, even if it 1237191672Sbms * otherwise fails kernel input validation; do not free it. 1238191672Sbms * Pullup may however free the mbuf chain m if it fails. 1239191672Sbms * 1240191672Sbms * Return IPPROTO_DONE if we freed m. Otherwise, return 0. 1241191672Sbms */ 1242191672Sbmsint 1243191672Sbmsmld_input(struct mbuf *m, int off, int icmp6len) 1244191672Sbms{ 1245191672Sbms struct ifnet *ifp; 1246191672Sbms struct ip6_hdr *ip6; 1247191672Sbms struct mld_hdr *mld; 1248191672Sbms int mldlen; 1249191672Sbms 1250191672Sbms CTR3(KTR_MLD, "%s: called w/mbuf (%p,%d)", __func__, m, off); 1251191672Sbms 1252191672Sbms ifp = m->m_pkthdr.rcvif; 1253191672Sbms 1254191672Sbms ip6 = mtod(m, struct ip6_hdr *); 1255191672Sbms 1256191672Sbms /* Pullup to appropriate size. */ 1257191672Sbms mld = (struct mld_hdr *)(mtod(m, uint8_t *) + off); 1258191672Sbms if (mld->mld_type == MLD_LISTENER_QUERY && 1259191672Sbms icmp6len >= sizeof(struct mldv2_query)) { 1260191672Sbms mldlen = sizeof(struct mldv2_query); 1261191672Sbms } else { 1262191672Sbms mldlen = sizeof(struct mld_hdr); 1263191672Sbms } 1264191672Sbms IP6_EXTHDR_GET(mld, struct mld_hdr *, m, off, mldlen); 1265191672Sbms if (mld == NULL) { 1266191672Sbms ICMP6STAT_INC(icp6s_badlen); 1267191672Sbms return (IPPROTO_DONE); 1268191672Sbms } 1269191672Sbms 1270192923Sbms /* 1271192923Sbms * Userland needs to see all of this traffic for implementing 1272192923Sbms * the endpoint discovery portion of multicast routing. 1273192923Sbms */ 1274191672Sbms switch (mld->mld_type) { 1275191672Sbms case MLD_LISTENER_QUERY: 1276191672Sbms icmp6_ifstat_inc(ifp, ifs6_in_mldquery); 1277191672Sbms if (icmp6len == sizeof(struct mld_hdr)) { 1278191672Sbms if (mld_v1_input_query(ifp, ip6, mld) != 0) 1279191672Sbms return (0); 1280191672Sbms } else if (icmp6len >= sizeof(struct mldv2_query)) { 1281191672Sbms if (mld_v2_input_query(ifp, ip6, m, off, 1282191672Sbms icmp6len) != 0) 1283191672Sbms return (0); 1284191672Sbms } 1285191672Sbms break; 1286191672Sbms case MLD_LISTENER_REPORT: 1287191672Sbms icmp6_ifstat_inc(ifp, ifs6_in_mldreport); 1288191672Sbms if (mld_v1_input_report(ifp, ip6, mld) != 0) 1289192923Sbms return (0); 1290191672Sbms break; 1291191672Sbms case MLDV2_LISTENER_REPORT: 1292191672Sbms icmp6_ifstat_inc(ifp, ifs6_in_mldreport); 1293191672Sbms break; 1294191672Sbms case MLD_LISTENER_DONE: 1295191672Sbms icmp6_ifstat_inc(ifp, ifs6_in_mlddone); 1296191672Sbms break; 1297191672Sbms default: 1298191672Sbms break; 1299191672Sbms } 1300191672Sbms 1301191672Sbms return (0); 1302191672Sbms} 1303191672Sbms 1304191672Sbms/* 1305191672Sbms * Fast timeout handler (global). 1306191672Sbms * VIMAGE: Timeout handlers are expected to service all vimages. 1307191672Sbms */ 1308191672Sbmsvoid 1309191672Sbmsmld_fasttimo(void) 1310191672Sbms{ 1311191672Sbms VNET_ITERATOR_DECL(vnet_iter); 1312191672Sbms 1313195760Srwatson VNET_LIST_RLOCK_NOSLEEP(); 1314191672Sbms VNET_FOREACH(vnet_iter) { 1315191672Sbms CURVNET_SET(vnet_iter); 1316191672Sbms mld_fasttimo_vnet(); 1317191672Sbms CURVNET_RESTORE(); 1318191672Sbms } 1319195760Srwatson VNET_LIST_RUNLOCK_NOSLEEP(); 1320191672Sbms} 1321191672Sbms 1322191672Sbms/* 1323191672Sbms * Fast timeout handler (per-vnet). 1324191672Sbms * 1325191672Sbms * VIMAGE: Assume caller has set up our curvnet. 1326191672Sbms */ 1327191672Sbmsstatic void 1328191672Sbmsmld_fasttimo_vnet(void) 1329191672Sbms{ 1330191672Sbms struct ifqueue scq; /* State-change packets */ 1331191672Sbms struct ifqueue qrq; /* Query response packets */ 1332191672Sbms struct ifnet *ifp; 1333191672Sbms struct mld_ifinfo *mli; 1334230076Sjhb struct ifmultiaddr *ifma; 1335230076Sjhb struct in6_multi *inm, *tinm; 1336191672Sbms int uri_fasthz; 1337191672Sbms 1338191672Sbms uri_fasthz = 0; 1339191672Sbms 1340191672Sbms /* 1341191672Sbms * Quick check to see if any work needs to be done, in order to 1342191672Sbms * minimize the overhead of fasttimo processing. 1343191672Sbms * SMPng: XXX Unlocked reads. 1344191672Sbms */ 1345191672Sbms if (!V_current_state_timers_running6 && 1346191672Sbms !V_interface_timers_running6 && 1347191672Sbms !V_state_change_timers_running6) 1348191672Sbms return; 1349191672Sbms 1350191672Sbms IN6_MULTI_LOCK(); 1351191672Sbms MLD_LOCK(); 1352191672Sbms 1353191672Sbms /* 1354191672Sbms * MLDv2 General Query response timer processing. 1355191672Sbms */ 1356191672Sbms if (V_interface_timers_running6) { 1357191672Sbms CTR1(KTR_MLD, "%s: interface timers running", __func__); 1358191672Sbms 1359191672Sbms V_interface_timers_running6 = 0; 1360191672Sbms LIST_FOREACH(mli, &V_mli_head, mli_link) { 1361191672Sbms if (mli->mli_v2_timer == 0) { 1362191672Sbms /* Do nothing. */ 1363191672Sbms } else if (--mli->mli_v2_timer == 0) { 1364191672Sbms mld_v2_dispatch_general_query(mli); 1365191672Sbms } else { 1366191672Sbms V_interface_timers_running6 = 1; 1367191672Sbms } 1368191672Sbms } 1369191672Sbms } 1370191672Sbms 1371191672Sbms if (!V_current_state_timers_running6 && 1372191672Sbms !V_state_change_timers_running6) 1373191672Sbms goto out_locked; 1374191672Sbms 1375191672Sbms V_current_state_timers_running6 = 0; 1376191672Sbms V_state_change_timers_running6 = 0; 1377191672Sbms 1378191672Sbms CTR1(KTR_MLD, "%s: state change timers running", __func__); 1379191672Sbms 1380191672Sbms /* 1381191672Sbms * MLD host report and state-change timer processing. 1382191672Sbms * Note: Processing a v2 group timer may remove a node. 1383191672Sbms */ 1384191672Sbms LIST_FOREACH(mli, &V_mli_head, mli_link) { 1385191672Sbms ifp = mli->mli_ifp; 1386191672Sbms 1387191672Sbms if (mli->mli_version == MLD_VERSION_2) { 1388191672Sbms uri_fasthz = MLD_RANDOM_DELAY(mli->mli_uri * 1389191672Sbms PR_FASTHZ); 1390191672Sbms 1391191672Sbms memset(&qrq, 0, sizeof(struct ifqueue)); 1392191672Sbms IFQ_SET_MAXLEN(&qrq, MLD_MAX_G_GS_PACKETS); 1393191672Sbms 1394191672Sbms memset(&scq, 0, sizeof(struct ifqueue)); 1395191672Sbms IFQ_SET_MAXLEN(&scq, MLD_MAX_STATE_CHANGE_PACKETS); 1396191672Sbms } 1397191672Sbms 1398233200Sjhb IF_ADDR_RLOCK(ifp); 1399230076Sjhb TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1400191672Sbms if (ifma->ifma_addr->sa_family != AF_INET6 || 1401191672Sbms ifma->ifma_protospec == NULL) 140253541Sshin continue; 1403191672Sbms inm = (struct in6_multi *)ifma->ifma_protospec; 1404191672Sbms switch (mli->mli_version) { 1405191672Sbms case MLD_VERSION_1: 1406230076Sjhb mld_v1_process_group_timer(mli, inm); 1407191672Sbms break; 1408191672Sbms case MLD_VERSION_2: 1409191672Sbms mld_v2_process_group_timers(mli, &qrq, 1410191672Sbms &scq, inm, uri_fasthz); 1411191672Sbms break; 1412191672Sbms } 1413191672Sbms } 1414233200Sjhb IF_ADDR_RUNLOCK(ifp); 141553541Sshin 1416230076Sjhb switch (mli->mli_version) { 1417230076Sjhb case MLD_VERSION_1: 1418230076Sjhb /* 1419230076Sjhb * Transmit reports for this lifecycle. This 1420230076Sjhb * is done while not holding IF_ADDR_LOCK 1421230076Sjhb * since this can call 1422230076Sjhb * in6ifa_ifpforlinklocal() which locks 1423230076Sjhb * IF_ADDR_LOCK internally as well as 1424230076Sjhb * ip6_output() to transmit a packet. 1425230076Sjhb */ 1426230076Sjhb SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, 1427230076Sjhb in6m_nrele, tinm) { 1428230076Sjhb SLIST_REMOVE_HEAD(&mli->mli_relinmhead, 1429230076Sjhb in6m_nrele); 1430230076Sjhb (void)mld_v1_transmit_report(inm, 1431230076Sjhb MLD_LISTENER_REPORT); 1432230076Sjhb } 1433230076Sjhb break; 1434230076Sjhb case MLD_VERSION_2: 1435191672Sbms mld_dispatch_queue(&qrq, 0); 1436191672Sbms mld_dispatch_queue(&scq, 0); 1437191672Sbms 1438191672Sbms /* 1439191672Sbms * Free the in_multi reference(s) for 1440191672Sbms * this lifecycle. 1441191672Sbms */ 1442191672Sbms SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, 1443191672Sbms in6m_nrele, tinm) { 1444191672Sbms SLIST_REMOVE_HEAD(&mli->mli_relinmhead, 1445191672Sbms in6m_nrele); 1446191672Sbms in6m_release_locked(inm); 144753541Sshin } 1448230076Sjhb break; 144953541Sshin } 1450191672Sbms } 1451191672Sbms 1452191672Sbmsout_locked: 1453191672Sbms MLD_UNLOCK(); 1454191672Sbms IN6_MULTI_UNLOCK(); 1455191672Sbms} 1456191672Sbms 1457191672Sbms/* 1458191672Sbms * Update host report group timer. 1459191672Sbms * Will update the global pending timer flags. 1460191672Sbms */ 1461191672Sbmsstatic void 1462230076Sjhbmld_v1_process_group_timer(struct mld_ifinfo *mli, struct in6_multi *inm) 1463191672Sbms{ 1464191672Sbms int report_timer_expired; 1465191672Sbms 1466191672Sbms IN6_MULTI_LOCK_ASSERT(); 1467191672Sbms MLD_LOCK_ASSERT(); 1468191672Sbms 1469191672Sbms if (inm->in6m_timer == 0) { 1470191672Sbms report_timer_expired = 0; 1471191672Sbms } else if (--inm->in6m_timer == 0) { 1472191672Sbms report_timer_expired = 1; 1473191672Sbms } else { 1474191672Sbms V_current_state_timers_running6 = 1; 1475191672Sbms return; 1476191672Sbms } 1477191672Sbms 1478191672Sbms switch (inm->in6m_state) { 1479191672Sbms case MLD_NOT_MEMBER: 1480191672Sbms case MLD_SILENT_MEMBER: 1481191672Sbms case MLD_IDLE_MEMBER: 1482191672Sbms case MLD_LAZY_MEMBER: 1483191672Sbms case MLD_SLEEPING_MEMBER: 1484191672Sbms case MLD_AWAKENING_MEMBER: 148553541Sshin break; 1486191672Sbms case MLD_REPORTING_MEMBER: 1487191672Sbms if (report_timer_expired) { 1488191672Sbms inm->in6m_state = MLD_IDLE_MEMBER; 1489230076Sjhb SLIST_INSERT_HEAD(&mli->mli_relinmhead, inm, 1490230076Sjhb in6m_nrele); 1491191672Sbms } 1492191672Sbms break; 1493191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 1494191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 1495191672Sbms case MLD_LEAVING_MEMBER: 1496191672Sbms break; 1497191672Sbms } 1498191672Sbms} 1499120941Sume 1500191672Sbms/* 1501191672Sbms * Update a group's timers for MLDv2. 1502191672Sbms * Will update the global pending timer flags. 1503191672Sbms * Note: Unlocked read from mli. 1504191672Sbms */ 1505191672Sbmsstatic void 1506191672Sbmsmld_v2_process_group_timers(struct mld_ifinfo *mli, 1507191672Sbms struct ifqueue *qrq, struct ifqueue *scq, 1508191672Sbms struct in6_multi *inm, const int uri_fasthz) 1509191672Sbms{ 1510191672Sbms int query_response_timer_expired; 1511191672Sbms int state_change_retransmit_timer_expired; 1512191672Sbms#ifdef KTR 1513191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 1514191672Sbms#endif 1515191672Sbms 1516191672Sbms IN6_MULTI_LOCK_ASSERT(); 1517191672Sbms MLD_LOCK_ASSERT(); 1518191672Sbms 1519191672Sbms query_response_timer_expired = 0; 1520191672Sbms state_change_retransmit_timer_expired = 0; 1521191672Sbms 1522191672Sbms /* 1523191672Sbms * During a transition from compatibility mode back to MLDv2, 1524191672Sbms * a group record in REPORTING state may still have its group 1525191672Sbms * timer active. This is a no-op in this function; it is easier 1526191672Sbms * to deal with it here than to complicate the slow-timeout path. 1527191672Sbms */ 1528191672Sbms if (inm->in6m_timer == 0) { 1529191672Sbms query_response_timer_expired = 0; 1530191672Sbms } else if (--inm->in6m_timer == 0) { 1531191672Sbms query_response_timer_expired = 1; 1532191672Sbms } else { 1533191672Sbms V_current_state_timers_running6 = 1; 1534191672Sbms } 1535191672Sbms 1536191672Sbms if (inm->in6m_sctimer == 0) { 1537191672Sbms state_change_retransmit_timer_expired = 0; 1538191672Sbms } else if (--inm->in6m_sctimer == 0) { 1539191672Sbms state_change_retransmit_timer_expired = 1; 1540191672Sbms } else { 1541191672Sbms V_state_change_timers_running6 = 1; 1542191672Sbms } 1543191672Sbms 1544191672Sbms /* We are in fasttimo, so be quick about it. */ 1545191672Sbms if (!state_change_retransmit_timer_expired && 1546191672Sbms !query_response_timer_expired) 1547191672Sbms return; 1548191672Sbms 1549191672Sbms switch (inm->in6m_state) { 1550191672Sbms case MLD_NOT_MEMBER: 1551191672Sbms case MLD_SILENT_MEMBER: 1552191672Sbms case MLD_SLEEPING_MEMBER: 1553191672Sbms case MLD_LAZY_MEMBER: 1554191672Sbms case MLD_AWAKENING_MEMBER: 1555191672Sbms case MLD_IDLE_MEMBER: 1556191672Sbms break; 1557191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 1558191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 155953541Sshin /* 1560191672Sbms * Respond to a previously pending Group-Specific 1561191672Sbms * or Group-and-Source-Specific query by enqueueing 1562191672Sbms * the appropriate Current-State report for 1563191672Sbms * immediate transmission. 156462587Sitojun */ 1565191672Sbms if (query_response_timer_expired) { 1566191672Sbms int retval; 156753541Sshin 1568191672Sbms retval = mld_v2_enqueue_group_record(qrq, inm, 0, 1, 1569200871Sbms (inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER), 1570200871Sbms 0); 1571191672Sbms CTR2(KTR_MLD, "%s: enqueue record = %d", 1572191672Sbms __func__, retval); 1573191672Sbms inm->in6m_state = MLD_REPORTING_MEMBER; 1574191672Sbms in6m_clear_recorded(inm); 1575191672Sbms } 1576191672Sbms /* FALLTHROUGH */ 1577191672Sbms case MLD_REPORTING_MEMBER: 1578191672Sbms case MLD_LEAVING_MEMBER: 1579191672Sbms if (state_change_retransmit_timer_expired) { 1580191672Sbms /* 1581191672Sbms * State-change retransmission timer fired. 1582191672Sbms * If there are any further pending retransmissions, 1583191672Sbms * set the global pending state-change flag, and 1584191672Sbms * reset the timer. 1585191672Sbms */ 1586191672Sbms if (--inm->in6m_scrv > 0) { 1587191672Sbms inm->in6m_sctimer = uri_fasthz; 1588191672Sbms V_state_change_timers_running6 = 1; 1589191672Sbms } 1590191672Sbms /* 1591191672Sbms * Retransmit the previously computed state-change 1592191672Sbms * report. If there are no further pending 1593191672Sbms * retransmissions, the mbuf queue will be consumed. 1594191672Sbms * Update T0 state to T1 as we have now sent 1595191672Sbms * a state-change. 1596191672Sbms */ 1597191672Sbms (void)mld_v2_merge_state_changes(inm, scq); 159853541Sshin 1599191672Sbms in6m_commit(inm); 1600191672Sbms CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__, 1601191672Sbms ip6_sprintf(ip6tbuf, &inm->in6m_addr), 1602191672Sbms inm->in6m_ifp->if_xname); 1603191672Sbms 1604191672Sbms /* 1605191672Sbms * If we are leaving the group for good, make sure 1606191672Sbms * we release MLD's reference to it. 1607191672Sbms * This release must be deferred using a SLIST, 1608191672Sbms * as we are called from a loop which traverses 1609191672Sbms * the in_ifmultiaddr TAILQ. 1610191672Sbms */ 1611191672Sbms if (inm->in6m_state == MLD_LEAVING_MEMBER && 1612191672Sbms inm->in6m_scrv == 0) { 1613191672Sbms inm->in6m_state = MLD_NOT_MEMBER; 1614191672Sbms SLIST_INSERT_HEAD(&mli->mli_relinmhead, 1615191672Sbms inm, in6m_nrele); 1616191672Sbms } 1617191672Sbms } 1618191672Sbms break; 1619191672Sbms } 1620191672Sbms} 1621191672Sbms 1622191672Sbms/* 1623191672Sbms * Switch to a different version on the given interface, 1624191672Sbms * as per Section 9.12. 1625191672Sbms */ 1626191672Sbmsstatic void 1627191672Sbmsmld_set_version(struct mld_ifinfo *mli, const int version) 1628191672Sbms{ 1629192562Sbms int old_version_timer; 1630191672Sbms 1631191672Sbms MLD_LOCK_ASSERT(); 1632191672Sbms 1633191672Sbms CTR4(KTR_MLD, "%s: switching to v%d on ifp %p(%s)", __func__, 1634191672Sbms version, mli->mli_ifp, mli->mli_ifp->if_xname); 1635191672Sbms 1636191672Sbms if (version == MLD_VERSION_1) { 163753541Sshin /* 1638191672Sbms * Compute the "Older Version Querier Present" timer as per 1639191672Sbms * Section 9.12. 164062587Sitojun */ 1641192923Sbms old_version_timer = (mli->mli_rv * mli->mli_qi) + mli->mli_qri; 1642191672Sbms old_version_timer *= PR_SLOWHZ; 1643192562Sbms mli->mli_v1_timer = old_version_timer; 164453541Sshin } 164562587Sitojun 1646192562Sbms if (mli->mli_v1_timer > 0 && mli->mli_version != MLD_VERSION_1) { 1647192562Sbms mli->mli_version = MLD_VERSION_1; 1648192562Sbms mld_v2_cancel_link_timers(mli); 1649191672Sbms } 165053541Sshin} 165153541Sshin 1652191672Sbms/* 1653191672Sbms * Cancel pending MLDv2 timers for the given link and all groups 1654191672Sbms * joined on it; state-change, general-query, and group-query timers. 1655191672Sbms */ 165653541Sshinstatic void 1657191672Sbmsmld_v2_cancel_link_timers(struct mld_ifinfo *mli) 165853541Sshin{ 1659191672Sbms struct ifmultiaddr *ifma; 1660191672Sbms struct ifnet *ifp; 1661230076Sjhb struct in6_multi *inm, *tinm; 166253541Sshin 1663191672Sbms CTR3(KTR_MLD, "%s: cancel v2 timers on ifp %p(%s)", __func__, 1664191672Sbms mli->mli_ifp, mli->mli_ifp->if_xname); 1665191672Sbms 1666191672Sbms IN6_MULTI_LOCK_ASSERT(); 1667191672Sbms MLD_LOCK_ASSERT(); 1668191672Sbms 166953541Sshin /* 1670191672Sbms * Fast-track this potentially expensive operation 1671191672Sbms * by checking all the global 'timer pending' flags. 167253541Sshin */ 1673191672Sbms if (!V_interface_timers_running6 && 1674191672Sbms !V_state_change_timers_running6 && 1675191672Sbms !V_current_state_timers_running6) 167653541Sshin return; 167753541Sshin 1678191672Sbms mli->mli_v2_timer = 0; 1679191672Sbms 1680191672Sbms ifp = mli->mli_ifp; 1681191672Sbms 1682233200Sjhb IF_ADDR_RLOCK(ifp); 1683191672Sbms TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1684191672Sbms if (ifma->ifma_addr->sa_family != AF_INET6) 1685191672Sbms continue; 1686191672Sbms inm = (struct in6_multi *)ifma->ifma_protospec; 1687191672Sbms switch (inm->in6m_state) { 1688191672Sbms case MLD_NOT_MEMBER: 1689191672Sbms case MLD_SILENT_MEMBER: 1690191672Sbms case MLD_IDLE_MEMBER: 1691191672Sbms case MLD_LAZY_MEMBER: 1692191672Sbms case MLD_SLEEPING_MEMBER: 1693191672Sbms case MLD_AWAKENING_MEMBER: 1694191672Sbms break; 1695191672Sbms case MLD_LEAVING_MEMBER: 1696191672Sbms /* 1697191672Sbms * If we are leaving the group and switching 1698191672Sbms * version, we need to release the final 1699191672Sbms * reference held for issuing the INCLUDE {}. 1700191672Sbms */ 1701230076Sjhb SLIST_INSERT_HEAD(&mli->mli_relinmhead, inm, 1702230076Sjhb in6m_nrele); 1703191672Sbms /* FALLTHROUGH */ 1704191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 1705191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 1706191672Sbms in6m_clear_recorded(inm); 1707191672Sbms /* FALLTHROUGH */ 1708191672Sbms case MLD_REPORTING_MEMBER: 1709191672Sbms inm->in6m_sctimer = 0; 1710191672Sbms inm->in6m_timer = 0; 1711191672Sbms inm->in6m_state = MLD_REPORTING_MEMBER; 1712191672Sbms /* 1713191672Sbms * Free any pending MLDv2 state-change records. 1714191672Sbms */ 1715191672Sbms _IF_DRAIN(&inm->in6m_scq); 1716191672Sbms break; 1717191672Sbms } 1718191672Sbms } 1719233200Sjhb IF_ADDR_RUNLOCK(ifp); 1720230076Sjhb SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, in6m_nrele, tinm) { 1721230076Sjhb SLIST_REMOVE_HEAD(&mli->mli_relinmhead, in6m_nrele); 1722230076Sjhb in6m_release_locked(inm); 1723230076Sjhb } 1724191672Sbms} 1725191672Sbms 1726191672Sbms/* 1727191672Sbms * Global slowtimo handler. 1728191672Sbms * VIMAGE: Timeout handlers are expected to service all vimages. 1729191672Sbms */ 1730191672Sbmsvoid 1731191672Sbmsmld_slowtimo(void) 1732191672Sbms{ 1733191672Sbms VNET_ITERATOR_DECL(vnet_iter); 1734191672Sbms 1735195760Srwatson VNET_LIST_RLOCK_NOSLEEP(); 1736191672Sbms VNET_FOREACH(vnet_iter) { 1737191672Sbms CURVNET_SET(vnet_iter); 1738191672Sbms mld_slowtimo_vnet(); 1739191672Sbms CURVNET_RESTORE(); 1740191672Sbms } 1741195760Srwatson VNET_LIST_RUNLOCK_NOSLEEP(); 1742191672Sbms} 1743191672Sbms 1744191672Sbms/* 1745191672Sbms * Per-vnet slowtimo handler. 1746191672Sbms */ 1747191672Sbmsstatic void 1748191672Sbmsmld_slowtimo_vnet(void) 1749191672Sbms{ 1750191672Sbms struct mld_ifinfo *mli; 1751191672Sbms 1752191672Sbms MLD_LOCK(); 1753191672Sbms 1754191672Sbms LIST_FOREACH(mli, &V_mli_head, mli_link) { 1755191672Sbms mld_v1_process_querier_timers(mli); 1756191672Sbms } 1757191672Sbms 1758191672Sbms MLD_UNLOCK(); 1759191672Sbms} 1760191672Sbms 1761191672Sbms/* 1762191672Sbms * Update the Older Version Querier Present timers for a link. 1763191672Sbms * See Section 9.12 of RFC 3810. 1764191672Sbms */ 1765191672Sbmsstatic void 1766191672Sbmsmld_v1_process_querier_timers(struct mld_ifinfo *mli) 1767191672Sbms{ 1768191672Sbms 1769191672Sbms MLD_LOCK_ASSERT(); 1770191672Sbms 1771192923Sbms if (mli->mli_version != MLD_VERSION_2 && --mli->mli_v1_timer == 0) { 1772191672Sbms /* 1773192562Sbms * MLDv1 Querier Present timer expired; revert to MLDv2. 1774191672Sbms */ 1775192562Sbms CTR5(KTR_MLD, 1776192562Sbms "%s: transition from v%d -> v%d on %p(%s)", 1777192562Sbms __func__, mli->mli_version, MLD_VERSION_2, 1778192562Sbms mli->mli_ifp, mli->mli_ifp->if_xname); 1779192562Sbms mli->mli_version = MLD_VERSION_2; 1780191672Sbms } 1781191672Sbms} 1782191672Sbms 1783191672Sbms/* 1784191672Sbms * Transmit an MLDv1 report immediately. 1785191672Sbms */ 1786191672Sbmsstatic int 1787191672Sbmsmld_v1_transmit_report(struct in6_multi *in6m, const int type) 1788191672Sbms{ 1789191672Sbms struct ifnet *ifp; 1790191672Sbms struct in6_ifaddr *ia; 1791191672Sbms struct ip6_hdr *ip6; 1792191672Sbms struct mbuf *mh, *md; 1793191672Sbms struct mld_hdr *mld; 1794191672Sbms 1795191672Sbms IN6_MULTI_LOCK_ASSERT(); 1796191672Sbms MLD_LOCK_ASSERT(); 1797191672Sbms 1798191672Sbms ifp = in6m->in6m_ifp; 1799191672Sbms ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 1800191672Sbms /* ia may be NULL if link-local address is tentative. */ 1801191672Sbms 1802111119Simp MGETHDR(mh, M_DONTWAIT, MT_HEADER); 1803194760Srwatson if (mh == NULL) { 1804194760Srwatson if (ia != NULL) 1805194760Srwatson ifa_free(&ia->ia_ifa); 1806191672Sbms return (ENOMEM); 1807194760Srwatson } 1808111119Simp MGET(md, M_DONTWAIT, MT_DATA); 180953541Sshin if (md == NULL) { 181053541Sshin m_free(mh); 1811194760Srwatson if (ia != NULL) 1812194760Srwatson ifa_free(&ia->ia_ifa); 1813191672Sbms return (ENOMEM); 181453541Sshin } 181553541Sshin mh->m_next = md; 181662587Sitojun 1817191672Sbms /* 1818191672Sbms * FUTURE: Consider increasing alignment by ETHER_HDR_LEN, so 1819191672Sbms * that ether_output() does not need to allocate another mbuf 1820191672Sbms * for the header in the most common case. 1821191672Sbms */ 1822191672Sbms MH_ALIGN(mh, sizeof(struct ip6_hdr)); 182396116Sume mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 182453541Sshin mh->m_len = sizeof(struct ip6_hdr); 182553541Sshin 182653541Sshin ip6 = mtod(mh, struct ip6_hdr *); 182753541Sshin ip6->ip6_flow = 0; 182862587Sitojun ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 182962587Sitojun ip6->ip6_vfc |= IPV6_VERSION; 183053541Sshin ip6->ip6_nxt = IPPROTO_ICMPV6; 1831191672Sbms ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any; 1832191672Sbms ip6->ip6_dst = in6m->in6m_addr; 183353541Sshin 183496116Sume md->m_len = sizeof(struct mld_hdr); 1835191672Sbms mld = mtod(md, struct mld_hdr *); 1836191672Sbms mld->mld_type = type; 1837191672Sbms mld->mld_code = 0; 1838191672Sbms mld->mld_cksum = 0; 1839191672Sbms mld->mld_maxdelay = 0; 1840191672Sbms mld->mld_reserved = 0; 1841191672Sbms mld->mld_addr = in6m->in6m_addr; 1842191672Sbms in6_clearscope(&mld->mld_addr); 1843191672Sbms mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, 1844191672Sbms sizeof(struct ip6_hdr), sizeof(struct mld_hdr)); 184553541Sshin 1846191672Sbms mld_save_context(mh, ifp); 1847191672Sbms mh->m_flags |= M_MLDV1; 184853541Sshin 1849191672Sbms mld_dispatch_packet(mh); 1850191672Sbms 1851194760Srwatson if (ia != NULL) 1852194760Srwatson ifa_free(&ia->ia_ifa); 1853191672Sbms return (0); 1854191672Sbms} 1855191672Sbms 1856191672Sbms/* 1857191672Sbms * Process a state change from the upper layer for the given IPv6 group. 1858191672Sbms * 1859191672Sbms * Each socket holds a reference on the in_multi in its own ip_moptions. 1860191672Sbms * The socket layer will have made the necessary updates to.the group 1861191672Sbms * state, it is now up to MLD to issue a state change report if there 1862191672Sbms * has been any change between T0 (when the last state-change was issued) 1863191672Sbms * and T1 (now). 1864191672Sbms * 1865191672Sbms * We use the MLDv2 state machine at group level. The MLd module 1866191672Sbms * however makes the decision as to which MLD protocol version to speak. 1867191672Sbms * A state change *from* INCLUDE {} always means an initial join. 1868191672Sbms * A state change *to* INCLUDE {} always means a final leave. 1869191672Sbms * 1870191672Sbms * If delay is non-zero, and the state change is an initial multicast 1871191672Sbms * join, the state change report will be delayed by 'delay' ticks 1872191672Sbms * in units of PR_FASTHZ if MLDv1 is active on the link; otherwise 1873191672Sbms * the initial MLDv2 state change report will be delayed by whichever 1874191672Sbms * is sooner, a pending state-change timer or delay itself. 1875191672Sbms * 1876191672Sbms * VIMAGE: curvnet should have been set by caller, as this routine 1877191672Sbms * is called from the socket option handlers. 1878191672Sbms */ 1879191672Sbmsint 1880191672Sbmsmld_change_state(struct in6_multi *inm, const int delay) 1881191672Sbms{ 1882191672Sbms struct mld_ifinfo *mli; 1883191672Sbms struct ifnet *ifp; 1884191672Sbms int error; 1885191672Sbms 1886191672Sbms IN6_MULTI_LOCK_ASSERT(); 1887191672Sbms 1888191672Sbms error = 0; 1889191672Sbms 189053541Sshin /* 1891191672Sbms * Try to detect if the upper layer just asked us to change state 1892191672Sbms * for an interface which has now gone away. 189353541Sshin */ 1894191672Sbms KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__)); 1895191672Sbms ifp = inm->in6m_ifma->ifma_ifp; 1896191672Sbms if (ifp != NULL) { 1897191672Sbms /* 1898191672Sbms * Sanity check that netinet6's notion of ifp is the 1899191672Sbms * same as net's. 1900191672Sbms */ 1901191672Sbms KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__)); 1902191672Sbms } 190353541Sshin 1904191672Sbms MLD_LOCK(); 190553541Sshin 1906191672Sbms mli = MLD_IFINFO(ifp); 1907191672Sbms KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp)); 1908191672Sbms 1909191672Sbms /* 1910191672Sbms * If we detect a state transition to or from MCAST_UNDEFINED 1911191672Sbms * for this group, then we are starting or finishing an MLD 1912191672Sbms * life cycle for this group. 1913191672Sbms */ 1914191672Sbms if (inm->in6m_st[1].iss_fmode != inm->in6m_st[0].iss_fmode) { 1915191672Sbms CTR3(KTR_MLD, "%s: inm transition %d -> %d", __func__, 1916191672Sbms inm->in6m_st[0].iss_fmode, inm->in6m_st[1].iss_fmode); 1917191672Sbms if (inm->in6m_st[0].iss_fmode == MCAST_UNDEFINED) { 1918191672Sbms CTR1(KTR_MLD, "%s: initial join", __func__); 1919191672Sbms error = mld_initial_join(inm, mli, delay); 1920191672Sbms goto out_locked; 1921191672Sbms } else if (inm->in6m_st[1].iss_fmode == MCAST_UNDEFINED) { 1922191672Sbms CTR1(KTR_MLD, "%s: final leave", __func__); 1923191672Sbms mld_final_leave(inm, mli); 1924191672Sbms goto out_locked; 1925191672Sbms } 1926191672Sbms } else { 1927191672Sbms CTR1(KTR_MLD, "%s: filter set change", __func__); 1928191672Sbms } 1929191672Sbms 1930191672Sbms error = mld_handle_state_change(inm, mli); 1931191672Sbms 1932191672Sbmsout_locked: 1933191672Sbms MLD_UNLOCK(); 1934191672Sbms return (error); 1935191672Sbms} 1936191672Sbms 1937191672Sbms/* 1938191672Sbms * Perform the initial join for an MLD group. 1939191672Sbms * 1940191672Sbms * When joining a group: 1941191672Sbms * If the group should have its MLD traffic suppressed, do nothing. 1942191672Sbms * MLDv1 starts sending MLDv1 host membership reports. 1943191672Sbms * MLDv2 will schedule an MLDv2 state-change report containing the 1944191672Sbms * initial state of the membership. 1945191672Sbms * 1946191672Sbms * If the delay argument is non-zero, then we must delay sending the 1947191672Sbms * initial state change for delay ticks (in units of PR_FASTHZ). 1948191672Sbms */ 1949191672Sbmsstatic int 1950191672Sbmsmld_initial_join(struct in6_multi *inm, struct mld_ifinfo *mli, 1951191672Sbms const int delay) 1952191672Sbms{ 1953191672Sbms struct ifnet *ifp; 1954191672Sbms struct ifqueue *ifq; 1955191672Sbms int error, retval, syncstates; 1956191672Sbms int odelay; 1957191672Sbms#ifdef KTR 1958191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 1959191672Sbms#endif 1960191672Sbms 1961191672Sbms CTR4(KTR_MLD, "%s: initial join %s on ifp %p(%s)", 1962191672Sbms __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr), 1963191672Sbms inm->in6m_ifp, inm->in6m_ifp->if_xname); 1964191672Sbms 1965191672Sbms error = 0; 1966191672Sbms syncstates = 1; 1967191672Sbms 1968191672Sbms ifp = inm->in6m_ifp; 1969191672Sbms 1970191672Sbms IN6_MULTI_LOCK_ASSERT(); 1971191672Sbms MLD_LOCK_ASSERT(); 1972191672Sbms 1973191672Sbms KASSERT(mli && mli->mli_ifp == ifp, ("%s: inconsistent ifp", __func__)); 1974191672Sbms 1975191672Sbms /* 1976191672Sbms * Groups joined on loopback or marked as 'not reported', 1977191672Sbms * enter the MLD_SILENT_MEMBER state and 1978191672Sbms * are never reported in any protocol exchanges. 1979191672Sbms * All other groups enter the appropriate state machine 1980191672Sbms * for the version in use on this link. 1981191672Sbms * A link marked as MLIF_SILENT causes MLD to be completely 1982191672Sbms * disabled for the link. 1983191672Sbms */ 1984191672Sbms if ((ifp->if_flags & IFF_LOOPBACK) || 1985191672Sbms (mli->mli_flags & MLIF_SILENT) || 1986191672Sbms !mld_is_addr_reported(&inm->in6m_addr)) { 1987191672Sbms CTR1(KTR_MLD, 1988191672Sbms"%s: not kicking state machine for silent group", __func__); 1989191672Sbms inm->in6m_state = MLD_SILENT_MEMBER; 1990191672Sbms inm->in6m_timer = 0; 1991191672Sbms } else { 1992191672Sbms /* 1993191672Sbms * Deal with overlapping in_multi lifecycle. 1994191672Sbms * If this group was LEAVING, then make sure 1995191672Sbms * we drop the reference we picked up to keep the 1996191672Sbms * group around for the final INCLUDE {} enqueue. 1997191672Sbms */ 1998191672Sbms if (mli->mli_version == MLD_VERSION_2 && 1999191672Sbms inm->in6m_state == MLD_LEAVING_MEMBER) 2000191672Sbms in6m_release_locked(inm); 2001191672Sbms 2002191672Sbms inm->in6m_state = MLD_REPORTING_MEMBER; 2003191672Sbms 2004191672Sbms switch (mli->mli_version) { 2005191672Sbms case MLD_VERSION_1: 2006191672Sbms /* 2007191672Sbms * If a delay was provided, only use it if 2008191672Sbms * it is greater than the delay normally 2009191672Sbms * used for an MLDv1 state change report, 2010191672Sbms * and delay sending the initial MLDv1 report 2011191672Sbms * by not transitioning to the IDLE state. 2012191672Sbms */ 2013191672Sbms odelay = MLD_RANDOM_DELAY(MLD_V1_MAX_RI * PR_FASTHZ); 2014191672Sbms if (delay) { 2015191672Sbms inm->in6m_timer = max(delay, odelay); 2016191672Sbms V_current_state_timers_running6 = 1; 2017191672Sbms } else { 2018191672Sbms inm->in6m_state = MLD_IDLE_MEMBER; 2019191672Sbms error = mld_v1_transmit_report(inm, 2020191672Sbms MLD_LISTENER_REPORT); 2021191672Sbms if (error == 0) { 2022191672Sbms inm->in6m_timer = odelay; 2023191672Sbms V_current_state_timers_running6 = 1; 2024191672Sbms } 2025191672Sbms } 202678064Sume break; 2027191672Sbms 2028191672Sbms case MLD_VERSION_2: 2029191672Sbms /* 2030191672Sbms * Defer update of T0 to T1, until the first copy 2031191672Sbms * of the state change has been transmitted. 2032191672Sbms */ 2033191672Sbms syncstates = 0; 2034191672Sbms 2035191672Sbms /* 2036191672Sbms * Immediately enqueue a State-Change Report for 2037191672Sbms * this interface, freeing any previous reports. 2038191672Sbms * Don't kick the timers if there is nothing to do, 2039191672Sbms * or if an error occurred. 2040191672Sbms */ 2041191672Sbms ifq = &inm->in6m_scq; 2042191672Sbms _IF_DRAIN(ifq); 2043191672Sbms retval = mld_v2_enqueue_group_record(ifq, inm, 1, 2044200871Sbms 0, 0, (mli->mli_flags & MLIF_USEALLOW)); 2045191672Sbms CTR2(KTR_MLD, "%s: enqueue record = %d", 2046191672Sbms __func__, retval); 2047191672Sbms if (retval <= 0) { 2048191672Sbms error = retval * -1; 2049191672Sbms break; 2050191672Sbms } 2051191672Sbms 2052191672Sbms /* 2053191672Sbms * Schedule transmission of pending state-change 2054191672Sbms * report up to RV times for this link. The timer 2055191672Sbms * will fire at the next mld_fasttimo (~200ms), 2056191672Sbms * giving us an opportunity to merge the reports. 2057191672Sbms * 2058191672Sbms * If a delay was provided to this function, only 2059191672Sbms * use this delay if sooner than the existing one. 2060191672Sbms */ 2061191672Sbms KASSERT(mli->mli_rv > 1, 2062191672Sbms ("%s: invalid robustness %d", __func__, 2063191672Sbms mli->mli_rv)); 2064191672Sbms inm->in6m_scrv = mli->mli_rv; 2065191672Sbms if (delay) { 2066191672Sbms if (inm->in6m_sctimer > 1) { 2067191672Sbms inm->in6m_sctimer = 2068191672Sbms min(inm->in6m_sctimer, delay); 2069191672Sbms } else 2070191672Sbms inm->in6m_sctimer = delay; 2071191672Sbms } else 2072191672Sbms inm->in6m_sctimer = 1; 2073191672Sbms V_state_change_timers_running6 = 1; 2074191672Sbms 2075191672Sbms error = 0; 207678064Sume break; 2077191672Sbms } 2078191672Sbms } 2079191672Sbms 2080191672Sbms /* 2081191672Sbms * Only update the T0 state if state change is atomic, 2082191672Sbms * i.e. we don't need to wait for a timer to fire before we 2083191672Sbms * can consider the state change to have been communicated. 2084191672Sbms */ 2085191672Sbms if (syncstates) { 2086191672Sbms in6m_commit(inm); 2087191672Sbms CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__, 2088191672Sbms ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2089191672Sbms inm->in6m_ifp->if_xname); 2090191672Sbms } 2091191672Sbms 2092191672Sbms return (error); 2093191672Sbms} 2094191672Sbms 2095191672Sbms/* 2096191672Sbms * Issue an intermediate state change during the life-cycle. 2097191672Sbms */ 2098191672Sbmsstatic int 2099191672Sbmsmld_handle_state_change(struct in6_multi *inm, struct mld_ifinfo *mli) 2100191672Sbms{ 2101191672Sbms struct ifnet *ifp; 2102191672Sbms int retval; 2103191672Sbms#ifdef KTR 2104191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 2105191672Sbms#endif 2106191672Sbms 2107191672Sbms CTR4(KTR_MLD, "%s: state change for %s on ifp %p(%s)", 2108191672Sbms __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2109191672Sbms inm->in6m_ifp, inm->in6m_ifp->if_xname); 2110191672Sbms 2111191672Sbms ifp = inm->in6m_ifp; 2112191672Sbms 2113191672Sbms IN6_MULTI_LOCK_ASSERT(); 2114191672Sbms MLD_LOCK_ASSERT(); 2115191672Sbms 2116191672Sbms KASSERT(mli && mli->mli_ifp == ifp, 2117191672Sbms ("%s: inconsistent ifp", __func__)); 2118191672Sbms 2119191672Sbms if ((ifp->if_flags & IFF_LOOPBACK) || 2120191672Sbms (mli->mli_flags & MLIF_SILENT) || 2121191672Sbms !mld_is_addr_reported(&inm->in6m_addr) || 2122191672Sbms (mli->mli_version != MLD_VERSION_2)) { 2123191672Sbms if (!mld_is_addr_reported(&inm->in6m_addr)) { 2124191672Sbms CTR1(KTR_MLD, 2125191672Sbms"%s: not kicking state machine for silent group", __func__); 2126191672Sbms } 2127191672Sbms CTR1(KTR_MLD, "%s: nothing to do", __func__); 2128191672Sbms in6m_commit(inm); 2129191672Sbms CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__, 2130191672Sbms ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2131191672Sbms inm->in6m_ifp->if_xname); 2132191672Sbms return (0); 2133191672Sbms } 2134191672Sbms 2135191672Sbms _IF_DRAIN(&inm->in6m_scq); 2136191672Sbms 2137200871Sbms retval = mld_v2_enqueue_group_record(&inm->in6m_scq, inm, 1, 0, 0, 2138200871Sbms (mli->mli_flags & MLIF_USEALLOW)); 2139191672Sbms CTR2(KTR_MLD, "%s: enqueue record = %d", __func__, retval); 2140191672Sbms if (retval <= 0) 2141191672Sbms return (-retval); 2142191672Sbms 2143191672Sbms /* 2144191672Sbms * If record(s) were enqueued, start the state-change 2145191672Sbms * report timer for this group. 2146191672Sbms */ 2147191672Sbms inm->in6m_scrv = mli->mli_rv; 2148191672Sbms inm->in6m_sctimer = 1; 2149191672Sbms V_state_change_timers_running6 = 1; 2150191672Sbms 2151191672Sbms return (0); 2152191672Sbms} 2153191672Sbms 2154191672Sbms/* 2155191672Sbms * Perform the final leave for a multicast address. 2156191672Sbms * 2157191672Sbms * When leaving a group: 2158191672Sbms * MLDv1 sends a DONE message, if and only if we are the reporter. 2159191672Sbms * MLDv2 enqueues a state-change report containing a transition 2160191672Sbms * to INCLUDE {} for immediate transmission. 2161191672Sbms */ 2162191672Sbmsstatic void 2163191672Sbmsmld_final_leave(struct in6_multi *inm, struct mld_ifinfo *mli) 2164191672Sbms{ 2165191672Sbms int syncstates; 2166191672Sbms#ifdef KTR 2167191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 2168191672Sbms#endif 2169191672Sbms 2170191672Sbms syncstates = 1; 2171191672Sbms 2172191672Sbms CTR4(KTR_MLD, "%s: final leave %s on ifp %p(%s)", 2173191672Sbms __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2174191672Sbms inm->in6m_ifp, inm->in6m_ifp->if_xname); 2175191672Sbms 2176191672Sbms IN6_MULTI_LOCK_ASSERT(); 2177191672Sbms MLD_LOCK_ASSERT(); 2178191672Sbms 2179191672Sbms switch (inm->in6m_state) { 2180191672Sbms case MLD_NOT_MEMBER: 2181191672Sbms case MLD_SILENT_MEMBER: 2182191672Sbms case MLD_LEAVING_MEMBER: 2183191672Sbms /* Already leaving or left; do nothing. */ 2184191672Sbms CTR1(KTR_MLD, 2185191672Sbms"%s: not kicking state machine for silent group", __func__); 2186191672Sbms break; 2187191672Sbms case MLD_REPORTING_MEMBER: 2188191672Sbms case MLD_IDLE_MEMBER: 2189191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 2190191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 2191191672Sbms if (mli->mli_version == MLD_VERSION_1) { 2192191672Sbms#ifdef INVARIANTS 2193191672Sbms if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER || 2194191672Sbms inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER) 2195191672Sbms panic("%s: MLDv2 state reached, not MLDv2 mode", 2196191672Sbms __func__); 2197191672Sbms#endif 2198191672Sbms mld_v1_transmit_report(inm, MLD_LISTENER_DONE); 2199191672Sbms inm->in6m_state = MLD_NOT_MEMBER; 2200237995Sbms V_current_state_timers_running6 = 1; 2201191672Sbms } else if (mli->mli_version == MLD_VERSION_2) { 2202191672Sbms /* 2203191672Sbms * Stop group timer and all pending reports. 2204191672Sbms * Immediately enqueue a state-change report 2205191672Sbms * TO_IN {} to be sent on the next fast timeout, 2206191672Sbms * giving us an opportunity to merge reports. 2207191672Sbms */ 2208191672Sbms _IF_DRAIN(&inm->in6m_scq); 2209191672Sbms inm->in6m_timer = 0; 2210191672Sbms inm->in6m_scrv = mli->mli_rv; 2211191672Sbms CTR4(KTR_MLD, "%s: Leaving %s/%s with %d " 2212191672Sbms "pending retransmissions.", __func__, 2213191672Sbms ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2214191672Sbms inm->in6m_ifp->if_xname, inm->in6m_scrv); 2215191672Sbms if (inm->in6m_scrv == 0) { 2216191672Sbms inm->in6m_state = MLD_NOT_MEMBER; 2217191672Sbms inm->in6m_sctimer = 0; 2218191672Sbms } else { 2219191672Sbms int retval; 2220191672Sbms 2221191672Sbms in6m_acquire_locked(inm); 2222191672Sbms 2223191672Sbms retval = mld_v2_enqueue_group_record( 2224200871Sbms &inm->in6m_scq, inm, 1, 0, 0, 2225200871Sbms (mli->mli_flags & MLIF_USEALLOW)); 2226191672Sbms KASSERT(retval != 0, 2227191672Sbms ("%s: enqueue record = %d", __func__, 2228191672Sbms retval)); 2229191672Sbms 2230191672Sbms inm->in6m_state = MLD_LEAVING_MEMBER; 2231191672Sbms inm->in6m_sctimer = 1; 2232191672Sbms V_state_change_timers_running6 = 1; 2233191672Sbms syncstates = 0; 2234191672Sbms } 223578064Sume break; 223653541Sshin } 2237191672Sbms break; 2238191672Sbms case MLD_LAZY_MEMBER: 2239191672Sbms case MLD_SLEEPING_MEMBER: 2240191672Sbms case MLD_AWAKENING_MEMBER: 2241191672Sbms /* Our reports are suppressed; do nothing. */ 2242191672Sbms break; 224353541Sshin } 2244191672Sbms 2245191672Sbms if (syncstates) { 2246191672Sbms in6m_commit(inm); 2247191672Sbms CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__, 2248191672Sbms ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2249191672Sbms inm->in6m_ifp->if_xname); 2250191672Sbms inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED; 2251191672Sbms CTR3(KTR_MLD, "%s: T1 now MCAST_UNDEFINED for %p/%s", 2252191672Sbms __func__, &inm->in6m_addr, inm->in6m_ifp->if_xname); 2253191672Sbms } 225453541Sshin} 2255126603Sume 2256126603Sume/* 2257191672Sbms * Enqueue an MLDv2 group record to the given output queue. 2258191672Sbms * 2259191672Sbms * If is_state_change is zero, a current-state record is appended. 2260191672Sbms * If is_state_change is non-zero, a state-change report is appended. 2261191672Sbms * 2262191672Sbms * If is_group_query is non-zero, an mbuf packet chain is allocated. 2263191672Sbms * If is_group_query is zero, and if there is a packet with free space 2264191672Sbms * at the tail of the queue, it will be appended to providing there 2265191672Sbms * is enough free space. 2266191672Sbms * Otherwise a new mbuf packet chain is allocated. 2267191672Sbms * 2268191672Sbms * If is_source_query is non-zero, each source is checked to see if 2269191672Sbms * it was recorded for a Group-Source query, and will be omitted if 2270191672Sbms * it is not both in-mode and recorded. 2271191672Sbms * 2272200871Sbms * If use_block_allow is non-zero, state change reports for initial join 2273200871Sbms * and final leave, on an inclusive mode group with a source list, will be 2274200871Sbms * rewritten to use the ALLOW_NEW and BLOCK_OLD record types, respectively. 2275200871Sbms * 2276191672Sbms * The function will attempt to allocate leading space in the packet 2277191672Sbms * for the IPv6+ICMP headers to be prepended without fragmenting the chain. 2278191672Sbms * 2279191672Sbms * If successful the size of all data appended to the queue is returned, 2280191672Sbms * otherwise an error code less than zero is returned, or zero if 2281191672Sbms * no record(s) were appended. 2282126603Sume */ 2283191672Sbmsstatic int 2284191672Sbmsmld_v2_enqueue_group_record(struct ifqueue *ifq, struct in6_multi *inm, 2285191672Sbms const int is_state_change, const int is_group_query, 2286200871Sbms const int is_source_query, const int use_block_allow) 2287126603Sume{ 2288191672Sbms struct mldv2_record mr; 2289191672Sbms struct mldv2_record *pmr; 2290191672Sbms struct ifnet *ifp; 2291191672Sbms struct ip6_msource *ims, *nims; 2292191672Sbms struct mbuf *m0, *m, *md; 2293191672Sbms int error, is_filter_list_change; 2294191672Sbms int minrec0len, m0srcs, msrcs, nbytes, off; 2295191672Sbms int record_has_sources; 2296191672Sbms int now; 2297191672Sbms int type; 2298191672Sbms uint8_t mode; 2299191672Sbms#ifdef KTR 2300191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 2301191672Sbms#endif 2302126603Sume 2303191672Sbms IN6_MULTI_LOCK_ASSERT(); 2304126603Sume 2305191672Sbms error = 0; 2306191672Sbms ifp = inm->in6m_ifp; 2307191672Sbms is_filter_list_change = 0; 2308191672Sbms m = NULL; 2309191672Sbms m0 = NULL; 2310191672Sbms m0srcs = 0; 2311191672Sbms msrcs = 0; 2312191672Sbms nbytes = 0; 2313191672Sbms nims = NULL; 2314191672Sbms record_has_sources = 1; 2315191672Sbms pmr = NULL; 2316191672Sbms type = MLD_DO_NOTHING; 2317191672Sbms mode = inm->in6m_st[1].iss_fmode; 2318126603Sume 2319191672Sbms /* 2320191672Sbms * If we did not transition out of ASM mode during t0->t1, 2321191672Sbms * and there are no source nodes to process, we can skip 2322191672Sbms * the generation of source records. 2323191672Sbms */ 2324191672Sbms if (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0 && 2325191672Sbms inm->in6m_nsrc == 0) 2326191672Sbms record_has_sources = 0; 2327191672Sbms 2328191672Sbms if (is_state_change) { 2329167729Sbms /* 2330191672Sbms * Queue a state change record. 2331191672Sbms * If the mode did not change, and there are non-ASM 2332191672Sbms * listeners or source filters present, 2333191672Sbms * we potentially need to issue two records for the group. 2334191672Sbms * If there are ASM listeners, and there was no filter 2335191672Sbms * mode transition of any kind, do nothing. 2336200871Sbms * 2337200871Sbms * If we are transitioning to MCAST_UNDEFINED, we need 2338200871Sbms * not send any sources. A transition to/from this state is 2339200871Sbms * considered inclusive with some special treatment. 2340200871Sbms * 2341200871Sbms * If we are rewriting initial joins/leaves to use 2342200871Sbms * ALLOW/BLOCK, and the group's membership is inclusive, 2343200871Sbms * we need to send sources in all cases. 2344167729Sbms */ 2345191672Sbms if (mode != inm->in6m_st[0].iss_fmode) { 2346191672Sbms if (mode == MCAST_EXCLUDE) { 2347191672Sbms CTR1(KTR_MLD, "%s: change to EXCLUDE", 2348191672Sbms __func__); 2349191672Sbms type = MLD_CHANGE_TO_EXCLUDE_MODE; 2350191672Sbms } else { 2351191672Sbms CTR1(KTR_MLD, "%s: change to INCLUDE", 2352191672Sbms __func__); 2353200871Sbms if (use_block_allow) { 2354200871Sbms /* 2355200871Sbms * XXX 2356200871Sbms * Here we're interested in state 2357200871Sbms * edges either direction between 2358200871Sbms * MCAST_UNDEFINED and MCAST_INCLUDE. 2359200871Sbms * Perhaps we should just check 2360200871Sbms * the group state, rather than 2361200871Sbms * the filter mode. 2362200871Sbms */ 2363200871Sbms if (mode == MCAST_UNDEFINED) { 2364200871Sbms type = MLD_BLOCK_OLD_SOURCES; 2365200871Sbms } else { 2366200871Sbms type = MLD_ALLOW_NEW_SOURCES; 2367200871Sbms } 2368200871Sbms } else { 2369200871Sbms type = MLD_CHANGE_TO_INCLUDE_MODE; 2370200871Sbms if (mode == MCAST_UNDEFINED) 2371200871Sbms record_has_sources = 0; 2372200871Sbms } 2373191672Sbms } 2374191672Sbms } else { 2375191672Sbms if (record_has_sources) { 2376191672Sbms is_filter_list_change = 1; 2377191672Sbms } else { 2378191672Sbms type = MLD_DO_NOTHING; 2379191672Sbms } 2380191672Sbms } 2381191672Sbms } else { 2382191672Sbms /* 2383191672Sbms * Queue a current state record. 2384191672Sbms */ 2385191672Sbms if (mode == MCAST_EXCLUDE) { 2386191672Sbms type = MLD_MODE_IS_EXCLUDE; 2387191672Sbms } else if (mode == MCAST_INCLUDE) { 2388191672Sbms type = MLD_MODE_IS_INCLUDE; 2389191672Sbms KASSERT(inm->in6m_st[1].iss_asm == 0, 2390191672Sbms ("%s: inm %p is INCLUDE but ASM count is %d", 2391191672Sbms __func__, inm, inm->in6m_st[1].iss_asm)); 2392191672Sbms } 2393191672Sbms } 2394126603Sume 2395191672Sbms /* 2396191672Sbms * Generate the filter list changes using a separate function. 2397191672Sbms */ 2398191672Sbms if (is_filter_list_change) 2399191672Sbms return (mld_v2_enqueue_filter_change(ifq, inm)); 2400126603Sume 2401191672Sbms if (type == MLD_DO_NOTHING) { 2402191672Sbms CTR3(KTR_MLD, "%s: nothing to do for %s/%s", 2403191672Sbms __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2404191672Sbms inm->in6m_ifp->if_xname); 2405191672Sbms return (0); 2406191672Sbms } 2407126603Sume 2408191672Sbms /* 2409191672Sbms * If any sources are present, we must be able to fit at least 2410191672Sbms * one in the trailing space of the tail packet's mbuf, 2411191672Sbms * ideally more. 2412191672Sbms */ 2413191672Sbms minrec0len = sizeof(struct mldv2_record); 2414191672Sbms if (record_has_sources) 2415191672Sbms minrec0len += sizeof(struct in6_addr); 2416191672Sbms 2417191672Sbms CTR4(KTR_MLD, "%s: queueing %s for %s/%s", __func__, 2418191672Sbms mld_rec_type_to_str(type), 2419191672Sbms ip6_sprintf(ip6tbuf, &inm->in6m_addr), 2420191672Sbms inm->in6m_ifp->if_xname); 2421191672Sbms 2422191672Sbms /* 2423191672Sbms * Check if we have a packet in the tail of the queue for this 2424191672Sbms * group into which the first group record for this group will fit. 2425191672Sbms * Otherwise allocate a new packet. 2426191672Sbms * Always allocate leading space for IP6+RA+ICMPV6+REPORT. 2427191672Sbms * Note: Group records for G/GSR query responses MUST be sent 2428191672Sbms * in their own packet. 2429191672Sbms */ 2430191672Sbms m0 = ifq->ifq_tail; 2431191672Sbms if (!is_group_query && 2432191672Sbms m0 != NULL && 2433191672Sbms (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= MLD_V2_REPORT_MAXRECS) && 2434191672Sbms (m0->m_pkthdr.len + minrec0len) < 2435191672Sbms (ifp->if_mtu - MLD_MTUSPACE)) { 2436191672Sbms m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2437191672Sbms sizeof(struct mldv2_record)) / 2438191672Sbms sizeof(struct in6_addr); 2439191672Sbms m = m0; 2440191672Sbms CTR1(KTR_MLD, "%s: use existing packet", __func__); 2441191672Sbms } else { 2442191672Sbms if (_IF_QFULL(ifq)) { 2443191672Sbms CTR1(KTR_MLD, "%s: outbound queue full", __func__); 2444191672Sbms return (-ENOMEM); 2445191672Sbms } 2446191672Sbms m = NULL; 2447191672Sbms m0srcs = (ifp->if_mtu - MLD_MTUSPACE - 2448191672Sbms sizeof(struct mldv2_record)) / sizeof(struct in6_addr); 2449191672Sbms if (!is_state_change && !is_group_query) 2450191672Sbms m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 2451191672Sbms if (m == NULL) 2452191672Sbms m = m_gethdr(M_DONTWAIT, MT_DATA); 2453191672Sbms if (m == NULL) 2454191672Sbms return (-ENOMEM); 2455191672Sbms 2456191672Sbms mld_save_context(m, ifp); 2457191672Sbms 2458191672Sbms CTR1(KTR_MLD, "%s: allocated first packet", __func__); 2459191672Sbms } 2460191672Sbms 2461191672Sbms /* 2462191672Sbms * Append group record. 2463191672Sbms * If we have sources, we don't know how many yet. 2464191672Sbms */ 2465191672Sbms mr.mr_type = type; 2466191672Sbms mr.mr_datalen = 0; 2467191672Sbms mr.mr_numsrc = 0; 2468191672Sbms mr.mr_addr = inm->in6m_addr; 2469191672Sbms in6_clearscope(&mr.mr_addr); 2470191672Sbms if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) { 2471191672Sbms if (m != m0) 2472191672Sbms m_freem(m); 2473191672Sbms CTR1(KTR_MLD, "%s: m_append() failed.", __func__); 2474191672Sbms return (-ENOMEM); 2475191672Sbms } 2476191672Sbms nbytes += sizeof(struct mldv2_record); 2477191672Sbms 2478191672Sbms /* 2479191672Sbms * Append as many sources as will fit in the first packet. 2480191672Sbms * If we are appending to a new packet, the chain allocation 2481191672Sbms * may potentially use clusters; use m_getptr() in this case. 2482191672Sbms * If we are appending to an existing packet, we need to obtain 2483191672Sbms * a pointer to the group record after m_append(), in case a new 2484191672Sbms * mbuf was allocated. 2485200871Sbms * 2486191672Sbms * Only append sources which are in-mode at t1. If we are 2487200871Sbms * transitioning to MCAST_UNDEFINED state on the group, and 2488200871Sbms * use_block_allow is zero, do not include source entries. 2489200871Sbms * Otherwise, we need to include this source in the report. 2490200871Sbms * 2491191672Sbms * Only report recorded sources in our filter set when responding 2492191672Sbms * to a group-source query. 2493191672Sbms */ 2494191672Sbms if (record_has_sources) { 2495191672Sbms if (m == m0) { 2496191672Sbms md = m_last(m); 2497191672Sbms pmr = (struct mldv2_record *)(mtod(md, uint8_t *) + 2498191672Sbms md->m_len - nbytes); 2499191672Sbms } else { 2500191672Sbms md = m_getptr(m, 0, &off); 2501191672Sbms pmr = (struct mldv2_record *)(mtod(md, uint8_t *) + 2502191672Sbms off); 2503191672Sbms } 2504191672Sbms msrcs = 0; 2505191672Sbms RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, 2506191672Sbms nims) { 2507191672Sbms CTR2(KTR_MLD, "%s: visit node %s", __func__, 2508191672Sbms ip6_sprintf(ip6tbuf, &ims->im6s_addr)); 2509191672Sbms now = im6s_get_mode(inm, ims, 1); 2510191672Sbms CTR2(KTR_MLD, "%s: node is %d", __func__, now); 2511191672Sbms if ((now != mode) || 2512200871Sbms (now == mode && 2513200871Sbms (!use_block_allow && mode == MCAST_UNDEFINED))) { 2514191672Sbms CTR1(KTR_MLD, "%s: skip node", __func__); 2515191672Sbms continue; 2516191672Sbms } 2517191672Sbms if (is_source_query && ims->im6s_stp == 0) { 2518191672Sbms CTR1(KTR_MLD, "%s: skip unrecorded node", 2519191672Sbms __func__); 2520191672Sbms continue; 2521191672Sbms } 2522191672Sbms CTR1(KTR_MLD, "%s: append node", __func__); 2523191672Sbms if (!m_append(m, sizeof(struct in6_addr), 2524191672Sbms (void *)&ims->im6s_addr)) { 2525191672Sbms if (m != m0) 2526191672Sbms m_freem(m); 2527191672Sbms CTR1(KTR_MLD, "%s: m_append() failed.", 2528191672Sbms __func__); 2529191672Sbms return (-ENOMEM); 2530191672Sbms } 2531191672Sbms nbytes += sizeof(struct in6_addr); 2532191672Sbms ++msrcs; 2533191672Sbms if (msrcs == m0srcs) 2534191672Sbms break; 2535191672Sbms } 2536191672Sbms CTR2(KTR_MLD, "%s: msrcs is %d this packet", __func__, 2537191672Sbms msrcs); 2538191672Sbms pmr->mr_numsrc = htons(msrcs); 2539191672Sbms nbytes += (msrcs * sizeof(struct in6_addr)); 2540191672Sbms } 2541191672Sbms 2542191672Sbms if (is_source_query && msrcs == 0) { 2543191672Sbms CTR1(KTR_MLD, "%s: no recorded sources to report", __func__); 2544191672Sbms if (m != m0) 2545191672Sbms m_freem(m); 2546191672Sbms return (0); 2547191672Sbms } 2548191672Sbms 2549191672Sbms /* 2550191672Sbms * We are good to go with first packet. 2551191672Sbms */ 2552191672Sbms if (m != m0) { 2553191672Sbms CTR1(KTR_MLD, "%s: enqueueing first packet", __func__); 2554191672Sbms m->m_pkthdr.PH_vt.vt_nrecs = 1; 2555191672Sbms _IF_ENQUEUE(ifq, m); 2556191672Sbms } else 2557191672Sbms m->m_pkthdr.PH_vt.vt_nrecs++; 2558191672Sbms 2559191672Sbms /* 2560191672Sbms * No further work needed if no source list in packet(s). 2561191672Sbms */ 2562191672Sbms if (!record_has_sources) 2563191672Sbms return (nbytes); 2564191672Sbms 2565191672Sbms /* 2566191672Sbms * Whilst sources remain to be announced, we need to allocate 2567191672Sbms * a new packet and fill out as many sources as will fit. 2568191672Sbms * Always try for a cluster first. 2569191672Sbms */ 2570191672Sbms while (nims != NULL) { 2571191672Sbms if (_IF_QFULL(ifq)) { 2572191672Sbms CTR1(KTR_MLD, "%s: outbound queue full", __func__); 2573191672Sbms return (-ENOMEM); 2574191672Sbms } 2575191672Sbms m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 2576191672Sbms if (m == NULL) 2577191672Sbms m = m_gethdr(M_DONTWAIT, MT_DATA); 2578191672Sbms if (m == NULL) 2579191672Sbms return (-ENOMEM); 2580191672Sbms mld_save_context(m, ifp); 2581191672Sbms md = m_getptr(m, 0, &off); 2582191672Sbms pmr = (struct mldv2_record *)(mtod(md, uint8_t *) + off); 2583191672Sbms CTR1(KTR_MLD, "%s: allocated next packet", __func__); 2584191672Sbms 2585191672Sbms if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) { 2586191672Sbms if (m != m0) 2587191672Sbms m_freem(m); 2588191672Sbms CTR1(KTR_MLD, "%s: m_append() failed.", __func__); 2589191672Sbms return (-ENOMEM); 2590191672Sbms } 2591191672Sbms m->m_pkthdr.PH_vt.vt_nrecs = 1; 2592191672Sbms nbytes += sizeof(struct mldv2_record); 2593191672Sbms 2594191672Sbms m0srcs = (ifp->if_mtu - MLD_MTUSPACE - 2595191672Sbms sizeof(struct mldv2_record)) / sizeof(struct in6_addr); 2596191672Sbms 2597191672Sbms msrcs = 0; 2598191672Sbms RB_FOREACH_FROM(ims, ip6_msource_tree, nims) { 2599191672Sbms CTR2(KTR_MLD, "%s: visit node %s", 2600191672Sbms __func__, ip6_sprintf(ip6tbuf, &ims->im6s_addr)); 2601191672Sbms now = im6s_get_mode(inm, ims, 1); 2602191672Sbms if ((now != mode) || 2603200871Sbms (now == mode && 2604200871Sbms (!use_block_allow && mode == MCAST_UNDEFINED))) { 2605191672Sbms CTR1(KTR_MLD, "%s: skip node", __func__); 2606191672Sbms continue; 2607191672Sbms } 2608191672Sbms if (is_source_query && ims->im6s_stp == 0) { 2609191672Sbms CTR1(KTR_MLD, "%s: skip unrecorded node", 2610191672Sbms __func__); 2611191672Sbms continue; 2612191672Sbms } 2613191672Sbms CTR1(KTR_MLD, "%s: append node", __func__); 2614191672Sbms if (!m_append(m, sizeof(struct in6_addr), 2615191672Sbms (void *)&ims->im6s_addr)) { 2616191672Sbms if (m != m0) 2617191672Sbms m_freem(m); 2618191672Sbms CTR1(KTR_MLD, "%s: m_append() failed.", 2619191672Sbms __func__); 2620191672Sbms return (-ENOMEM); 2621191672Sbms } 2622191672Sbms ++msrcs; 2623191672Sbms if (msrcs == m0srcs) 2624191672Sbms break; 2625191672Sbms } 2626191672Sbms pmr->mr_numsrc = htons(msrcs); 2627191672Sbms nbytes += (msrcs * sizeof(struct in6_addr)); 2628191672Sbms 2629191672Sbms CTR1(KTR_MLD, "%s: enqueueing next packet", __func__); 2630191672Sbms _IF_ENQUEUE(ifq, m); 2631191672Sbms } 2632191672Sbms 2633191672Sbms return (nbytes); 2634191672Sbms} 2635191672Sbms 2636191672Sbms/* 2637191672Sbms * Type used to mark record pass completion. 2638191672Sbms * We exploit the fact we can cast to this easily from the 2639191672Sbms * current filter modes on each ip_msource node. 2640191672Sbms */ 2641191672Sbmstypedef enum { 2642191672Sbms REC_NONE = 0x00, /* MCAST_UNDEFINED */ 2643191672Sbms REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 2644191672Sbms REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 2645191672Sbms REC_FULL = REC_ALLOW | REC_BLOCK 2646191672Sbms} rectype_t; 2647191672Sbms 2648191672Sbms/* 2649191672Sbms * Enqueue an MLDv2 filter list change to the given output queue. 2650191672Sbms * 2651191672Sbms * Source list filter state is held in an RB-tree. When the filter list 2652191672Sbms * for a group is changed without changing its mode, we need to compute 2653191672Sbms * the deltas between T0 and T1 for each source in the filter set, 2654191672Sbms * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 2655191672Sbms * 2656191672Sbms * As we may potentially queue two record types, and the entire R-B tree 2657191672Sbms * needs to be walked at once, we break this out into its own function 2658191672Sbms * so we can generate a tightly packed queue of packets. 2659191672Sbms * 2660191672Sbms * XXX This could be written to only use one tree walk, although that makes 2661191672Sbms * serializing into the mbuf chains a bit harder. For now we do two walks 2662191672Sbms * which makes things easier on us, and it may or may not be harder on 2663191672Sbms * the L2 cache. 2664191672Sbms * 2665191672Sbms * If successful the size of all data appended to the queue is returned, 2666191672Sbms * otherwise an error code less than zero is returned, or zero if 2667191672Sbms * no record(s) were appended. 2668191672Sbms */ 2669191672Sbmsstatic int 2670191672Sbmsmld_v2_enqueue_filter_change(struct ifqueue *ifq, struct in6_multi *inm) 2671191672Sbms{ 2672191672Sbms static const int MINRECLEN = 2673191672Sbms sizeof(struct mldv2_record) + sizeof(struct in6_addr); 2674191672Sbms struct ifnet *ifp; 2675191672Sbms struct mldv2_record mr; 2676191672Sbms struct mldv2_record *pmr; 2677191672Sbms struct ip6_msource *ims, *nims; 2678191672Sbms struct mbuf *m, *m0, *md; 2679191672Sbms int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 2680191672Sbms int nallow, nblock; 2681191672Sbms uint8_t mode, now, then; 2682191672Sbms rectype_t crt, drt, nrt; 2683191672Sbms#ifdef KTR 2684191672Sbms char ip6tbuf[INET6_ADDRSTRLEN]; 2685191672Sbms#endif 2686191672Sbms 2687191672Sbms IN6_MULTI_LOCK_ASSERT(); 2688191672Sbms 2689191672Sbms if (inm->in6m_nsrc == 0 || 2690191672Sbms (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0)) 2691191672Sbms return (0); 2692191672Sbms 2693191672Sbms ifp = inm->in6m_ifp; /* interface */ 2694191672Sbms mode = inm->in6m_st[1].iss_fmode; /* filter mode at t1 */ 2695191672Sbms crt = REC_NONE; /* current group record type */ 2696191672Sbms drt = REC_NONE; /* mask of completed group record types */ 2697191672Sbms nrt = REC_NONE; /* record type for current node */ 2698191672Sbms m0srcs = 0; /* # source which will fit in current mbuf chain */ 2699191672Sbms npbytes = 0; /* # of bytes appended this packet */ 2700191672Sbms nbytes = 0; /* # of bytes appended to group's state-change queue */ 2701191672Sbms rsrcs = 0; /* # sources encoded in current record */ 2702191672Sbms schanged = 0; /* # nodes encoded in overall filter change */ 2703191672Sbms nallow = 0; /* # of source entries in ALLOW_NEW */ 2704191672Sbms nblock = 0; /* # of source entries in BLOCK_OLD */ 2705191672Sbms nims = NULL; /* next tree node pointer */ 2706191672Sbms 2707191672Sbms /* 2708191672Sbms * For each possible filter record mode. 2709191672Sbms * The first kind of source we encounter tells us which 2710191672Sbms * is the first kind of record we start appending. 2711191672Sbms * If a node transitioned to UNDEFINED at t1, its mode is treated 2712191672Sbms * as the inverse of the group's filter mode. 2713191672Sbms */ 2714191672Sbms while (drt != REC_FULL) { 2715191672Sbms do { 2716191672Sbms m0 = ifq->ifq_tail; 2717191672Sbms if (m0 != NULL && 2718191672Sbms (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= 2719191672Sbms MLD_V2_REPORT_MAXRECS) && 2720191672Sbms (m0->m_pkthdr.len + MINRECLEN) < 2721191672Sbms (ifp->if_mtu - MLD_MTUSPACE)) { 2722191672Sbms m = m0; 2723191672Sbms m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2724191672Sbms sizeof(struct mldv2_record)) / 2725191672Sbms sizeof(struct in6_addr); 2726191672Sbms CTR1(KTR_MLD, 2727191672Sbms "%s: use previous packet", __func__); 2728191672Sbms } else { 2729191672Sbms m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 2730191672Sbms if (m == NULL) 2731191672Sbms m = m_gethdr(M_DONTWAIT, MT_DATA); 2732191672Sbms if (m == NULL) { 2733191672Sbms CTR1(KTR_MLD, 2734191672Sbms "%s: m_get*() failed", __func__); 2735191672Sbms return (-ENOMEM); 2736191672Sbms } 2737191672Sbms m->m_pkthdr.PH_vt.vt_nrecs = 0; 2738191672Sbms mld_save_context(m, ifp); 2739191672Sbms m0srcs = (ifp->if_mtu - MLD_MTUSPACE - 2740191672Sbms sizeof(struct mldv2_record)) / 2741191672Sbms sizeof(struct in6_addr); 2742191672Sbms npbytes = 0; 2743191672Sbms CTR1(KTR_MLD, 2744191672Sbms "%s: allocated new packet", __func__); 2745191672Sbms } 2746191672Sbms /* 2747191672Sbms * Append the MLD group record header to the 2748191672Sbms * current packet's data area. 2749191672Sbms * Recalculate pointer to free space for next 2750191672Sbms * group record, in case m_append() allocated 2751191672Sbms * a new mbuf or cluster. 2752191672Sbms */ 2753191672Sbms memset(&mr, 0, sizeof(mr)); 2754191672Sbms mr.mr_addr = inm->in6m_addr; 2755191672Sbms in6_clearscope(&mr.mr_addr); 2756191672Sbms if (!m_append(m, sizeof(mr), (void *)&mr)) { 2757191672Sbms if (m != m0) 2758191672Sbms m_freem(m); 2759191672Sbms CTR1(KTR_MLD, 2760191672Sbms "%s: m_append() failed", __func__); 2761191672Sbms return (-ENOMEM); 2762191672Sbms } 2763191672Sbms npbytes += sizeof(struct mldv2_record); 2764191672Sbms if (m != m0) { 2765191672Sbms /* new packet; offset in chain */ 2766191672Sbms md = m_getptr(m, npbytes - 2767191672Sbms sizeof(struct mldv2_record), &off); 2768191672Sbms pmr = (struct mldv2_record *)(mtod(md, 2769191672Sbms uint8_t *) + off); 2770191672Sbms } else { 2771191672Sbms /* current packet; offset from last append */ 2772191672Sbms md = m_last(m); 2773191672Sbms pmr = (struct mldv2_record *)(mtod(md, 2774191672Sbms uint8_t *) + md->m_len - 2775191672Sbms sizeof(struct mldv2_record)); 2776191672Sbms } 2777191672Sbms /* 2778191672Sbms * Begin walking the tree for this record type 2779191672Sbms * pass, or continue from where we left off 2780191672Sbms * previously if we had to allocate a new packet. 2781191672Sbms * Only report deltas in-mode at t1. 2782191672Sbms * We need not report included sources as allowed 2783191672Sbms * if we are in inclusive mode on the group, 2784191672Sbms * however the converse is not true. 2785191672Sbms */ 2786191672Sbms rsrcs = 0; 2787191672Sbms if (nims == NULL) { 2788191672Sbms nims = RB_MIN(ip6_msource_tree, 2789191672Sbms &inm->in6m_srcs); 2790191672Sbms } 2791191672Sbms RB_FOREACH_FROM(ims, ip6_msource_tree, nims) { 2792191672Sbms CTR2(KTR_MLD, "%s: visit node %s", __func__, 2793191672Sbms ip6_sprintf(ip6tbuf, &ims->im6s_addr)); 2794191672Sbms now = im6s_get_mode(inm, ims, 1); 2795191672Sbms then = im6s_get_mode(inm, ims, 0); 2796191672Sbms CTR3(KTR_MLD, "%s: mode: t0 %d, t1 %d", 2797191672Sbms __func__, then, now); 2798191672Sbms if (now == then) { 2799191672Sbms CTR1(KTR_MLD, 2800191672Sbms "%s: skip unchanged", __func__); 2801191672Sbms continue; 2802191672Sbms } 2803191672Sbms if (mode == MCAST_EXCLUDE && 2804191672Sbms now == MCAST_INCLUDE) { 2805191672Sbms CTR1(KTR_MLD, 2806191672Sbms "%s: skip IN src on EX group", 2807191672Sbms __func__); 2808191672Sbms continue; 2809191672Sbms } 2810191672Sbms nrt = (rectype_t)now; 2811191672Sbms if (nrt == REC_NONE) 2812191672Sbms nrt = (rectype_t)(~mode & REC_FULL); 2813191672Sbms if (schanged++ == 0) { 2814191672Sbms crt = nrt; 2815191672Sbms } else if (crt != nrt) 2816191672Sbms continue; 2817191672Sbms if (!m_append(m, sizeof(struct in6_addr), 2818191672Sbms (void *)&ims->im6s_addr)) { 2819191672Sbms if (m != m0) 2820191672Sbms m_freem(m); 2821191672Sbms CTR1(KTR_MLD, 2822191672Sbms "%s: m_append() failed", __func__); 2823191672Sbms return (-ENOMEM); 2824191672Sbms } 2825191672Sbms nallow += !!(crt == REC_ALLOW); 2826191672Sbms nblock += !!(crt == REC_BLOCK); 2827191672Sbms if (++rsrcs == m0srcs) 2828191672Sbms break; 2829191672Sbms } 2830191672Sbms /* 2831191672Sbms * If we did not append any tree nodes on this 2832191672Sbms * pass, back out of allocations. 2833191672Sbms */ 2834191672Sbms if (rsrcs == 0) { 2835191672Sbms npbytes -= sizeof(struct mldv2_record); 2836191672Sbms if (m != m0) { 2837191672Sbms CTR1(KTR_MLD, 2838191672Sbms "%s: m_free(m)", __func__); 2839191672Sbms m_freem(m); 2840191672Sbms } else { 2841191672Sbms CTR1(KTR_MLD, 2842191672Sbms "%s: m_adj(m, -mr)", __func__); 2843191672Sbms m_adj(m, -((int)sizeof( 2844191672Sbms struct mldv2_record))); 2845191672Sbms } 2846191672Sbms continue; 2847191672Sbms } 2848191672Sbms npbytes += (rsrcs * sizeof(struct in6_addr)); 2849191672Sbms if (crt == REC_ALLOW) 2850191672Sbms pmr->mr_type = MLD_ALLOW_NEW_SOURCES; 2851191672Sbms else if (crt == REC_BLOCK) 2852191672Sbms pmr->mr_type = MLD_BLOCK_OLD_SOURCES; 2853191672Sbms pmr->mr_numsrc = htons(rsrcs); 2854191672Sbms /* 2855191672Sbms * Count the new group record, and enqueue this 2856191672Sbms * packet if it wasn't already queued. 2857191672Sbms */ 2858191672Sbms m->m_pkthdr.PH_vt.vt_nrecs++; 2859191672Sbms if (m != m0) 2860191672Sbms _IF_ENQUEUE(ifq, m); 2861191672Sbms nbytes += npbytes; 2862191672Sbms } while (nims != NULL); 2863191672Sbms drt |= crt; 2864191672Sbms crt = (~crt & REC_FULL); 2865191672Sbms } 2866191672Sbms 2867191672Sbms CTR3(KTR_MLD, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 2868191672Sbms nallow, nblock); 2869191672Sbms 2870191672Sbms return (nbytes); 2871191672Sbms} 2872191672Sbms 2873191672Sbmsstatic int 2874191672Sbmsmld_v2_merge_state_changes(struct in6_multi *inm, struct ifqueue *ifscq) 2875191672Sbms{ 2876191672Sbms struct ifqueue *gq; 2877191672Sbms struct mbuf *m; /* pending state-change */ 2878191672Sbms struct mbuf *m0; /* copy of pending state-change */ 2879191672Sbms struct mbuf *mt; /* last state-change in packet */ 2880191672Sbms int docopy, domerge; 2881191672Sbms u_int recslen; 2882191672Sbms 2883191672Sbms docopy = 0; 2884191672Sbms domerge = 0; 2885191672Sbms recslen = 0; 2886191672Sbms 2887191672Sbms IN6_MULTI_LOCK_ASSERT(); 2888191672Sbms MLD_LOCK_ASSERT(); 2889191672Sbms 2890191672Sbms /* 2891191672Sbms * If there are further pending retransmissions, make a writable 2892191672Sbms * copy of each queued state-change message before merging. 2893191672Sbms */ 2894191672Sbms if (inm->in6m_scrv > 0) 2895191672Sbms docopy = 1; 2896191672Sbms 2897191672Sbms gq = &inm->in6m_scq; 2898191672Sbms#ifdef KTR 2899191672Sbms if (gq->ifq_head == NULL) { 2900191672Sbms CTR2(KTR_MLD, "%s: WARNING: queue for inm %p is empty", 2901191672Sbms __func__, inm); 2902191672Sbms } 2903191672Sbms#endif 2904191672Sbms 2905191672Sbms m = gq->ifq_head; 2906191672Sbms while (m != NULL) { 2907167729Sbms /* 2908191672Sbms * Only merge the report into the current packet if 2909191672Sbms * there is sufficient space to do so; an MLDv2 report 2910191672Sbms * packet may only contain 65,535 group records. 2911191672Sbms * Always use a simple mbuf chain concatentation to do this, 2912191672Sbms * as large state changes for single groups may have 2913191672Sbms * allocated clusters. 2914167729Sbms */ 2915191672Sbms domerge = 0; 2916191672Sbms mt = ifscq->ifq_tail; 2917191672Sbms if (mt != NULL) { 2918191672Sbms recslen = m_length(m, NULL); 2919191672Sbms 2920191672Sbms if ((mt->m_pkthdr.PH_vt.vt_nrecs + 2921191672Sbms m->m_pkthdr.PH_vt.vt_nrecs <= 2922191672Sbms MLD_V2_REPORT_MAXRECS) && 2923191672Sbms (mt->m_pkthdr.len + recslen <= 2924191672Sbms (inm->in6m_ifp->if_mtu - MLD_MTUSPACE))) 2925191672Sbms domerge = 1; 2926167729Sbms } 2927151539Ssuz 2928191672Sbms if (!domerge && _IF_QFULL(gq)) { 2929191672Sbms CTR2(KTR_MLD, 2930191672Sbms "%s: outbound queue full, skipping whole packet %p", 2931191672Sbms __func__, m); 2932191672Sbms mt = m->m_nextpkt; 2933191672Sbms if (!docopy) 2934191672Sbms m_freem(m); 2935191672Sbms m = mt; 2936191672Sbms continue; 2937167729Sbms } 2938151539Ssuz 2939191672Sbms if (!docopy) { 2940191672Sbms CTR2(KTR_MLD, "%s: dequeueing %p", __func__, m); 2941191672Sbms _IF_DEQUEUE(gq, m0); 2942191672Sbms m = m0->m_nextpkt; 2943191672Sbms } else { 2944191672Sbms CTR2(KTR_MLD, "%s: copying %p", __func__, m); 2945191672Sbms m0 = m_dup(m, M_NOWAIT); 2946191672Sbms if (m0 == NULL) 2947191672Sbms return (ENOMEM); 2948191672Sbms m0->m_nextpkt = NULL; 2949191672Sbms m = m->m_nextpkt; 2950191672Sbms } 2951167729Sbms 2952191672Sbms if (!domerge) { 2953191672Sbms CTR3(KTR_MLD, "%s: queueing %p to ifscq %p)", 2954191672Sbms __func__, m0, ifscq); 2955191672Sbms _IF_ENQUEUE(ifscq, m0); 2956191672Sbms } else { 2957191672Sbms struct mbuf *mtl; /* last mbuf of packet mt */ 2958191672Sbms 2959191672Sbms CTR3(KTR_MLD, "%s: merging %p with ifscq tail %p)", 2960191672Sbms __func__, m0, mt); 2961191672Sbms 2962191672Sbms mtl = m_last(mt); 2963191672Sbms m0->m_flags &= ~M_PKTHDR; 2964191672Sbms mt->m_pkthdr.len += recslen; 2965191672Sbms mt->m_pkthdr.PH_vt.vt_nrecs += 2966191672Sbms m0->m_pkthdr.PH_vt.vt_nrecs; 2967191672Sbms 2968191672Sbms mtl->m_next = m0; 2969191672Sbms } 2970191672Sbms } 2971191672Sbms 2972191672Sbms return (0); 2973191672Sbms} 2974191672Sbms 2975191672Sbms/* 2976191672Sbms * Respond to a pending MLDv2 General Query. 2977191672Sbms */ 2978191672Sbmsstatic void 2979191672Sbmsmld_v2_dispatch_general_query(struct mld_ifinfo *mli) 2980191672Sbms{ 2981230076Sjhb struct ifmultiaddr *ifma; 2982191672Sbms struct ifnet *ifp; 2983191672Sbms struct in6_multi *inm; 2984191672Sbms int retval; 2985191672Sbms 2986191672Sbms IN6_MULTI_LOCK_ASSERT(); 2987191672Sbms MLD_LOCK_ASSERT(); 2988191672Sbms 2989191672Sbms KASSERT(mli->mli_version == MLD_VERSION_2, 2990191672Sbms ("%s: called when version %d", __func__, mli->mli_version)); 2991191672Sbms 2992191672Sbms ifp = mli->mli_ifp; 2993191672Sbms 2994233200Sjhb IF_ADDR_RLOCK(ifp); 2995230076Sjhb TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2996191672Sbms if (ifma->ifma_addr->sa_family != AF_INET6 || 2997191672Sbms ifma->ifma_protospec == NULL) 2998191672Sbms continue; 2999191672Sbms 3000191672Sbms inm = (struct in6_multi *)ifma->ifma_protospec; 3001191672Sbms KASSERT(ifp == inm->in6m_ifp, 3002191672Sbms ("%s: inconsistent ifp", __func__)); 3003191672Sbms 3004191672Sbms switch (inm->in6m_state) { 3005191672Sbms case MLD_NOT_MEMBER: 3006191672Sbms case MLD_SILENT_MEMBER: 3007167729Sbms break; 3008191672Sbms case MLD_REPORTING_MEMBER: 3009191672Sbms case MLD_IDLE_MEMBER: 3010191672Sbms case MLD_LAZY_MEMBER: 3011191672Sbms case MLD_SLEEPING_MEMBER: 3012191672Sbms case MLD_AWAKENING_MEMBER: 3013191672Sbms inm->in6m_state = MLD_REPORTING_MEMBER; 3014191672Sbms retval = mld_v2_enqueue_group_record(&mli->mli_gq, 3015200871Sbms inm, 0, 0, 0, 0); 3016191672Sbms CTR2(KTR_MLD, "%s: enqueue record = %d", 3017191672Sbms __func__, retval); 3018191672Sbms break; 3019191672Sbms case MLD_G_QUERY_PENDING_MEMBER: 3020191672Sbms case MLD_SG_QUERY_PENDING_MEMBER: 3021191672Sbms case MLD_LEAVING_MEMBER: 3022191672Sbms break; 3023167729Sbms } 3024191672Sbms } 3025233200Sjhb IF_ADDR_RUNLOCK(ifp); 3026167729Sbms 3027191672Sbms mld_dispatch_queue(&mli->mli_gq, MLD_MAX_RESPONSE_BURST); 3028167729Sbms 3029191672Sbms /* 3030191672Sbms * Slew transmission of bursts over 500ms intervals. 3031191672Sbms */ 3032191672Sbms if (mli->mli_gq.ifq_head != NULL) { 3033191672Sbms mli->mli_v2_timer = 1 + MLD_RANDOM_DELAY( 3034191672Sbms MLD_RESPONSE_BURST_INTERVAL); 3035191672Sbms V_interface_timers_running6 = 1; 3036191672Sbms } 3037191672Sbms} 3038191672Sbms 3039191672Sbms/* 3040191672Sbms * Transmit the next pending message in the output queue. 3041191672Sbms * 3042191672Sbms * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3043191672Sbms * MRT: Nothing needs to be done, as MLD traffic is always local to 3044191672Sbms * a link and uses a link-scope multicast address. 3045191672Sbms */ 3046191672Sbmsstatic void 3047191672Sbmsmld_dispatch_packet(struct mbuf *m) 3048191672Sbms{ 3049191672Sbms struct ip6_moptions im6o; 3050191672Sbms struct ifnet *ifp; 3051191672Sbms struct ifnet *oifp; 3052191672Sbms struct mbuf *m0; 3053191672Sbms struct mbuf *md; 3054191672Sbms struct ip6_hdr *ip6; 3055191672Sbms struct mld_hdr *mld; 3056191672Sbms int error; 3057191672Sbms int off; 3058191672Sbms int type; 3059191672Sbms uint32_t ifindex; 3060191672Sbms 3061191672Sbms CTR2(KTR_MLD, "%s: transmit %p", __func__, m); 3062191672Sbms 3063191672Sbms /* 3064191672Sbms * Set VNET image pointer from enqueued mbuf chain 3065191672Sbms * before doing anything else. Whilst we use interface 3066191672Sbms * indexes to guard against interface detach, they are 3067191672Sbms * unique to each VIMAGE and must be retrieved. 3068191672Sbms */ 3069191672Sbms ifindex = mld_restore_context(m); 3070191672Sbms 3071191672Sbms /* 3072191672Sbms * Check if the ifnet still exists. This limits the scope of 3073191672Sbms * any race in the absence of a global ifp lock for low cost 3074191672Sbms * (an array lookup). 3075191672Sbms */ 3076191672Sbms ifp = ifnet_byindex(ifindex); 3077191672Sbms if (ifp == NULL) { 3078191672Sbms CTR3(KTR_MLD, "%s: dropped %p as ifindex %u went away.", 3079191672Sbms __func__, m, ifindex); 3080191672Sbms m_freem(m); 3081191672Sbms IP6STAT_INC(ip6s_noroute); 3082191672Sbms goto out; 3083191672Sbms } 3084191672Sbms 3085191672Sbms im6o.im6o_multicast_hlim = 1; 3086191672Sbms im6o.im6o_multicast_loop = (V_ip6_mrouter != NULL); 3087191672Sbms im6o.im6o_multicast_ifp = ifp; 3088191672Sbms 3089191672Sbms if (m->m_flags & M_MLDV1) { 3090191672Sbms m0 = m; 3091191672Sbms } else { 3092191672Sbms m0 = mld_v2_encap_report(ifp, m); 3093191672Sbms if (m0 == NULL) { 3094191672Sbms CTR2(KTR_MLD, "%s: dropped %p", __func__, m); 3095191672Sbms IP6STAT_INC(ip6s_odropped); 3096191672Sbms goto out; 3097167729Sbms } 3098191672Sbms } 3099167729Sbms 3100191672Sbms mld_scrub_context(m0); 3101191672Sbms m->m_flags &= ~(M_PROTOFLAGS); 3102191672Sbms m0->m_pkthdr.rcvif = V_loif; 3103167729Sbms 3104191672Sbms ip6 = mtod(m0, struct ip6_hdr *); 3105191672Sbms#if 0 3106191672Sbms (void)in6_setscope(&ip6->ip6_dst, ifp, NULL); /* XXX LOR */ 3107191672Sbms#else 3108191672Sbms /* 3109191672Sbms * XXX XXX Break some KPI rules to prevent an LOR which would 3110191672Sbms * occur if we called in6_setscope() at transmission. 3111191672Sbms * See comments at top of file. 3112191672Sbms */ 3113191672Sbms MLD_EMBEDSCOPE(&ip6->ip6_dst, ifp->if_index); 3114191672Sbms#endif 3115167729Sbms 3116191672Sbms /* 3117191672Sbms * Retrieve the ICMPv6 type before handoff to ip6_output(), 3118191672Sbms * so we can bump the stats. 3119191672Sbms */ 3120191672Sbms md = m_getptr(m0, sizeof(struct ip6_hdr), &off); 3121191672Sbms mld = (struct mld_hdr *)(mtod(md, uint8_t *) + off); 3122191672Sbms type = mld->mld_type; 3123167729Sbms 3124191672Sbms error = ip6_output(m0, &mld_po, NULL, IPV6_UNSPECSRC, &im6o, 3125191672Sbms &oifp, NULL); 3126191672Sbms if (error) { 3127191672Sbms CTR3(KTR_MLD, "%s: ip6_output(%p) = %d", __func__, m0, error); 3128191672Sbms goto out; 3129191672Sbms } 3130191672Sbms ICMP6STAT_INC(icp6s_outhist[type]); 3131191672Sbms if (oifp != NULL) { 3132191672Sbms icmp6_ifstat_inc(oifp, ifs6_out_msg); 3133191672Sbms switch (type) { 3134191672Sbms case MLD_LISTENER_REPORT: 3135191672Sbms case MLDV2_LISTENER_REPORT: 3136191672Sbms icmp6_ifstat_inc(oifp, ifs6_out_mldreport); 3137191672Sbms break; 3138191672Sbms case MLD_LISTENER_DONE: 3139191672Sbms icmp6_ifstat_inc(oifp, ifs6_out_mlddone); 3140191672Sbms break; 3141191672Sbms } 3142191672Sbms } 3143191672Sbmsout: 3144191816Szec return; 3145126603Sume} 3146126603Sume 3147126603Sume/* 3148191672Sbms * Encapsulate an MLDv2 report. 3149167729Sbms * 3150191672Sbms * KAME IPv6 requires that hop-by-hop options be passed separately, 3151191672Sbms * and that the IPv6 header be prepended in a separate mbuf. 3152191672Sbms * 3153191672Sbms * Returns a pointer to the new mbuf chain head, or NULL if the 3154191672Sbms * allocation failed. 3155126603Sume */ 3156191672Sbmsstatic struct mbuf * 3157191672Sbmsmld_v2_encap_report(struct ifnet *ifp, struct mbuf *m) 3158126603Sume{ 3159191672Sbms struct mbuf *mh; 3160191672Sbms struct mldv2_report *mld; 3161191672Sbms struct ip6_hdr *ip6; 3162191672Sbms struct in6_ifaddr *ia; 3163191672Sbms int mldreclen; 3164126603Sume 3165191672Sbms KASSERT(ifp != NULL, ("%s: null ifp", __func__)); 3166191672Sbms KASSERT((m->m_flags & M_PKTHDR), 3167191672Sbms ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3168167729Sbms 3169191672Sbms /* 3170191672Sbms * RFC3590: OK to send as :: or tentative during DAD. 3171191672Sbms */ 3172191672Sbms ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 3173191672Sbms if (ia == NULL) 3174191672Sbms CTR1(KTR_MLD, "%s: warning: ia is NULL", __func__); 3175167729Sbms 3176191672Sbms MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3177191672Sbms if (mh == NULL) { 3178194760Srwatson if (ia != NULL) 3179194760Srwatson ifa_free(&ia->ia_ifa); 3180191672Sbms m_freem(m); 3181191672Sbms return (NULL); 3182191672Sbms } 3183191672Sbms MH_ALIGN(mh, sizeof(struct ip6_hdr) + sizeof(struct mldv2_report)); 3184167729Sbms 3185191672Sbms mldreclen = m_length(m, NULL); 3186191672Sbms CTR2(KTR_MLD, "%s: mldreclen is %d", __func__, mldreclen); 3187167729Sbms 3188191672Sbms mh->m_len = sizeof(struct ip6_hdr) + sizeof(struct mldv2_report); 3189191672Sbms mh->m_pkthdr.len = sizeof(struct ip6_hdr) + 3190191672Sbms sizeof(struct mldv2_report) + mldreclen; 3191191672Sbms 3192191672Sbms ip6 = mtod(mh, struct ip6_hdr *); 3193191672Sbms ip6->ip6_flow = 0; 3194191672Sbms ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 3195191672Sbms ip6->ip6_vfc |= IPV6_VERSION; 3196191672Sbms ip6->ip6_nxt = IPPROTO_ICMPV6; 3197191672Sbms ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any; 3198194760Srwatson if (ia != NULL) 3199194760Srwatson ifa_free(&ia->ia_ifa); 3200191672Sbms ip6->ip6_dst = in6addr_linklocal_allv2routers; 3201191672Sbms /* scope ID will be set in netisr */ 3202191672Sbms 3203191672Sbms mld = (struct mldv2_report *)(ip6 + 1); 3204191672Sbms mld->mld_type = MLDV2_LISTENER_REPORT; 3205191672Sbms mld->mld_code = 0; 3206191672Sbms mld->mld_cksum = 0; 3207191672Sbms mld->mld_v2_reserved = 0; 3208191672Sbms mld->mld_v2_numrecs = htons(m->m_pkthdr.PH_vt.vt_nrecs); 3209191672Sbms m->m_pkthdr.PH_vt.vt_nrecs = 0; 3210191672Sbms 3211191672Sbms mh->m_next = m; 3212191672Sbms mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, 3213191672Sbms sizeof(struct ip6_hdr), sizeof(struct mldv2_report) + mldreclen); 3214191672Sbms return (mh); 3215191672Sbms} 3216191672Sbms 3217191672Sbms#ifdef KTR 3218191672Sbmsstatic char * 3219191672Sbmsmld_rec_type_to_str(const int type) 3220191672Sbms{ 3221191672Sbms 3222191672Sbms switch (type) { 3223191672Sbms case MLD_CHANGE_TO_EXCLUDE_MODE: 3224191672Sbms return "TO_EX"; 3225191672Sbms break; 3226191672Sbms case MLD_CHANGE_TO_INCLUDE_MODE: 3227191672Sbms return "TO_IN"; 3228191672Sbms break; 3229191672Sbms case MLD_MODE_IS_EXCLUDE: 3230191672Sbms return "MODE_EX"; 3231191672Sbms break; 3232191672Sbms case MLD_MODE_IS_INCLUDE: 3233191672Sbms return "MODE_IN"; 3234191672Sbms break; 3235191672Sbms case MLD_ALLOW_NEW_SOURCES: 3236191672Sbms return "ALLOW_NEW"; 3237191672Sbms break; 3238191672Sbms case MLD_BLOCK_OLD_SOURCES: 3239191672Sbms return "BLOCK_OLD"; 3240191672Sbms break; 3241191672Sbms default: 3242191672Sbms break; 3243126603Sume } 3244191672Sbms return "unknown"; 3245126603Sume} 3246191672Sbms#endif 3247191672Sbms 3248191672Sbmsstatic void 3249195837Srwatsonmld_init(void *unused __unused) 3250191672Sbms{ 3251191672Sbms 3252191672Sbms CTR1(KTR_MLD, "%s: initializing", __func__); 3253191672Sbms MLD_LOCK_INIT(); 3254191672Sbms 3255191672Sbms ip6_initpktopts(&mld_po); 3256191672Sbms mld_po.ip6po_hlim = 1; 3257191672Sbms mld_po.ip6po_hbh = &mld_ra.hbh; 3258191672Sbms mld_po.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER; 3259191672Sbms mld_po.ip6po_flags = IP6PO_DONTFRAG; 3260191672Sbms} 3261195837SrwatsonSYSINIT(mld_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_init, NULL); 3262191672Sbms 3263191672Sbmsstatic void 3264195837Srwatsonmld_uninit(void *unused __unused) 3265191672Sbms{ 3266191672Sbms 3267191672Sbms CTR1(KTR_MLD, "%s: tearing down", __func__); 3268191672Sbms MLD_LOCK_DESTROY(); 3269191672Sbms} 3270195837SrwatsonSYSUNINIT(mld_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_uninit, NULL); 3271191672Sbms 3272195837Srwatsonstatic void 3273195837Srwatsonvnet_mld_init(const void *unused __unused) 3274191672Sbms{ 3275191672Sbms 3276191672Sbms CTR1(KTR_MLD, "%s: initializing", __func__); 3277191672Sbms 3278191672Sbms LIST_INIT(&V_mli_head); 3279191672Sbms} 3280195837SrwatsonVNET_SYSINIT(vnet_mld_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_init, 3281195837Srwatson NULL); 3282191672Sbms 3283195837Srwatsonstatic void 3284195837Srwatsonvnet_mld_uninit(const void *unused __unused) 3285191672Sbms{ 3286191672Sbms 3287191672Sbms CTR1(KTR_MLD, "%s: tearing down", __func__); 3288191672Sbms 3289191672Sbms KASSERT(LIST_EMPTY(&V_mli_head), 3290191672Sbms ("%s: mli list not empty; ifnets not detached?", __func__)); 3291191672Sbms} 3292195837SrwatsonVNET_SYSUNINIT(vnet_mld_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_uninit, 3293195837Srwatson NULL); 3294191672Sbms 3295191672Sbmsstatic int 3296191672Sbmsmld_modevent(module_t mod, int type, void *unused __unused) 3297191672Sbms{ 3298191672Sbms 3299191672Sbms switch (type) { 3300191672Sbms case MOD_LOAD: 3301191672Sbms case MOD_UNLOAD: 3302191672Sbms break; 3303191672Sbms default: 3304191672Sbms return (EOPNOTSUPP); 3305191672Sbms } 3306191672Sbms return (0); 3307191672Sbms} 3308191672Sbms 3309191672Sbmsstatic moduledata_t mld_mod = { 3310191672Sbms "mld", 3311191672Sbms mld_modevent, 3312191672Sbms 0 3313191672Sbms}; 3314191672SbmsDECLARE_MODULE(mld, mld_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 3315