igmp.c revision 358274
1118611Snjl/*- 2118611Snjl * Copyright (c) 2007-2009 Bruce Simpson. 3118611Snjl * Copyright (c) 1988 Stephen Deering. 4118611Snjl * Copyright (c) 1992, 1993 5118611Snjl * The Regents of the University of California. All rights reserved. 6118611Snjl * 7217365Sjkim * This code is derived from software contributed to Berkeley by 8245582Sjkim * Stephen Deering of Stanford University. 9118611Snjl * 10118611Snjl * Redistribution and use in source and binary forms, with or without 11217365Sjkim * modification, are permitted provided that the following conditions 12217365Sjkim * are met: 13217365Sjkim * 1. Redistributions of source code must retain the above copyright 14217365Sjkim * notice, this list of conditions and the following disclaimer. 15217365Sjkim * 2. Redistributions in binary form must reproduce the above copyright 16217365Sjkim * notice, this list of conditions and the following disclaimer in the 17217365Sjkim * documentation and/or other materials provided with the distribution. 18217365Sjkim * 4. Neither the name of the University nor the names of its contributors 19217365Sjkim * may be used to endorse or promote products derived from this software 20217365Sjkim * without specific prior written permission. 21217365Sjkim * 22217365Sjkim * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23217365Sjkim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24217365Sjkim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25118611Snjl * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26217365Sjkim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27217365Sjkim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28217365Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29118611Snjl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30217365Sjkim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31217365Sjkim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32217365Sjkim * SUCH DAMAGE. 33217365Sjkim * 34217365Sjkim * @(#)igmp.c 8.1 (Berkeley) 7/19/93 35217365Sjkim */ 36217365Sjkim 37217365Sjkim/* 38217365Sjkim * Internet Group Management Protocol (IGMP) routines. 39217365Sjkim * [RFC1112, RFC2236, RFC3376] 40217365Sjkim * 41217365Sjkim * Written by Steve Deering, Stanford, May 1988. 42217365Sjkim * Modified by Rosen Sharma, Stanford, Aug 1994. 43118611Snjl * Modified by Bill Fenner, Xerox PARC, Feb 1995. 44118611Snjl * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995. 45151937Sjkim * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson. 46118611Snjl * 47118611Snjl * MULTICAST Revision: 3.5.1.4 48118611Snjl */ 49118611Snjl 50151937Sjkim#include <sys/cdefs.h> 51118611Snjl__FBSDID("$FreeBSD: stable/11/sys/netinet/igmp.c 358274 2020-02-24 09:58:57Z hselasky $"); 52151937Sjkim 53151937Sjkim#include "opt_ddb.h" 54151937Sjkim 55151937Sjkim#include <sys/param.h> 56151937Sjkim#include <sys/systm.h> 57233250Sjkim#include <sys/module.h> 58233250Sjkim#include <sys/malloc.h> 59233250Sjkim#include <sys/mbuf.h> 60233250Sjkim#include <sys/socket.h> 61233250Sjkim#include <sys/protosw.h> 62233250Sjkim#include <sys/kernel.h> 63233250Sjkim#include <sys/lock.h> 64233250Sjkim#include <sys/rmlock.h> 65233250Sjkim#include <sys/sysctl.h> 66233250Sjkim#include <sys/ktr.h> 67233250Sjkim#include <sys/condvar.h> 68233250Sjkim 69193529Sjkim#ifdef DDB 70193529Sjkim#include <ddb/ddb.h> 71193529Sjkim#endif 72193529Sjkim 73193529Sjkim#include <net/if.h> 74193529Sjkim#include <net/if_var.h> 75193529Sjkim#include <net/netisr.h> 76193529Sjkim#include <net/vnet.h> 77193529Sjkim 78193529Sjkim#include <netinet/in.h> 79193529Sjkim#include <netinet/in_var.h> 80193529Sjkim#include <netinet/in_systm.h> 81193529Sjkim#include <netinet/ip.h> 82193529Sjkim#include <netinet/ip_var.h> 83193529Sjkim#include <netinet/ip_options.h> 84193529Sjkim#include <netinet/igmp.h> 85193529Sjkim#include <netinet/igmp_var.h> 86193529Sjkim 87193529Sjkim#include <machine/in_cksum.h> 88193529Sjkim 89118611Snjl#include <security/mac/mac_framework.h> 90118611Snjl 91118611Snjl#ifndef KTR_IGMPV3 92118611Snjl#define KTR_IGMPV3 KTR_INET 93118611Snjl#endif 94118611Snjl 95118611Snjlstatic struct igmp_ifsoftc * 96118611Snjl igi_alloc_locked(struct ifnet *); 97241973Sjkimstatic void igi_delete_locked(const struct ifnet *); 98118611Snjlstatic void igmp_dispatch_queue(struct mbufq *, int, const int); 99118611Snjlstatic void igmp_fasttimo_vnet(void); 100118611Snjlstatic void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 101118611Snjlstatic int igmp_handle_state_change(struct in_multi *, 102118611Snjl struct igmp_ifsoftc *); 103151937Sjkimstatic int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 104118611Snjlstatic int igmp_input_v1_query(struct ifnet *, const struct ip *, 105118611Snjl const struct igmp *); 106118611Snjlstatic int igmp_input_v2_query(struct ifnet *, const struct ip *, 107118611Snjl const struct igmp *); 108118611Snjlstatic int igmp_input_v3_query(struct ifnet *, const struct ip *, 109118611Snjl /*const*/ struct igmpv3 *); 110118611Snjlstatic int igmp_input_v3_group_query(struct in_multi *, 111202771Sjkim struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 112118611Snjlstatic int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 113118611Snjl /*const*/ struct igmp *); 114118611Snjlstatic int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 115118611Snjl /*const*/ struct igmp *); 116118611Snjlstatic void igmp_intr(struct mbuf *); 117118611Snjlstatic int igmp_isgroupreported(const struct in_addr); 118118611Snjlstatic struct mbuf * 119202771Sjkim igmp_ra_alloc(void); 120202771Sjkim#ifdef KTR 121202771Sjkimstatic char * igmp_rec_type_to_str(const int); 122202771Sjkim#endif 123118611Snjlstatic void igmp_set_version(struct igmp_ifsoftc *, const int); 124118611Snjlstatic void igmp_slowtimo_vnet(void); 125118611Snjlstatic int igmp_v1v2_queue_report(struct in_multi *, const int); 126118611Snjlstatic void igmp_v1v2_process_group_timer(struct in_multi *, const int); 127118611Snjlstatic void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 128118611Snjlstatic void igmp_v2_update_group(struct in_multi *, const int); 129118611Snjlstatic void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 130118611Snjlstatic void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 131118611Snjlstatic struct mbuf * 132118611Snjl igmp_v3_encap_report(struct ifnet *, struct mbuf *); 133118611Snjlstatic int igmp_v3_enqueue_group_record(struct mbufq *, 134118611Snjl struct in_multi *, const int, const int, const int); 135118611Snjlstatic int igmp_v3_enqueue_filter_change(struct mbufq *, 136118611Snjl struct in_multi *); 137118611Snjlstatic void igmp_v3_process_group_timers(struct igmp_ifsoftc *, 138118611Snjl struct mbufq *, struct mbufq *, struct in_multi *, 139118611Snjl const int); 140118611Snjlstatic int igmp_v3_merge_state_changes(struct in_multi *, 141118611Snjl struct mbufq *); 142118611Snjlstatic void igmp_v3_suppress_group_record(struct in_multi *); 143118611Snjlstatic int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 144118611Snjlstatic int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 145118611Snjlstatic int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 146118611Snjl 147118611Snjlstatic const struct netisr_handler igmp_nh = { 148118611Snjl .nh_name = "igmp", 149118611Snjl .nh_handler = igmp_intr, 150118611Snjl .nh_proto = NETISR_IGMP, 151118611Snjl .nh_policy = NETISR_POLICY_SOURCE, 152151937Sjkim}; 153118611Snjl 154118611Snjl/* 155118611Snjl * System-wide globals. 156118611Snjl * 157118611Snjl * Unlocked access to these is OK, except for the global IGMP output 158118611Snjl * queue. The IGMP subsystem lock ends up being system-wide for the moment, 159118611Snjl * because all VIMAGEs have to share a global output queue, as netisrs 160118611Snjl * themselves are not virtualized. 161118611Snjl * 162118611Snjl * Locking: 163118611Snjl * * The permitted lock order is: IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 164118611Snjl * Any may be taken independently; if any are held at the same 165118611Snjl * time, the above lock order must be followed. 166118611Snjl * * All output is delegated to the netisr. 167118611Snjl * Now that Giant has been eliminated, the netisr may be inlined. 168118611Snjl * * IN_MULTI_LOCK covers in_multi. 169118611Snjl * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 170118611Snjl * including the output queue. 171118611Snjl * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 172118611Snjl * per-link state iterators. 173118611Snjl * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 174151937Sjkim * therefore it is not refcounted. 175151937Sjkim * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 176118611Snjl * 177118611Snjl * Reference counting 178118611Snjl * * IGMP acquires its own reference every time an in_multi is passed to 179118611Snjl * it and the group is being joined for the first time. 180118611Snjl * * IGMP releases its reference(s) on in_multi in a deferred way, 181118611Snjl * because the operations which process the release run as part of 182233250Sjkim * a loop whose control variables are directly affected by the release 183216471Sjkim * (that, and not recursing on the IF_ADDR_LOCK). 184216471Sjkim * 185240716Sjkim * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 186118611Snjl * to a vnet in ifp->if_vnet. 187118611Snjl * 188193529Sjkim * SMPng: XXX We may potentially race operations on ifma_protospec. 189193529Sjkim * The problem is that we currently lack a clean way of taking the 190193529Sjkim * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 191193529Sjkim * as anything which modifies ifma needs to be covered by that lock. 192193529Sjkim * So check for ifma_protospec being NULL before proceeding. 193151937Sjkim */ 194151937Sjkimstruct mtx igmp_mtx; 195151937Sjkim 196151937Sjkimstruct mbuf *m_raopt; /* Router Alert option */ 197118611Snjlstatic MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 198118611Snjl 199118611Snjl/* 200118611Snjl * VIMAGE-wide globals. 201118611Snjl * 202118611Snjl * The IGMPv3 timers themselves need to run per-image, however, 203118611Snjl * protosw timers run globally (see tcp). 204250838Sjkim * An ifnet can only be in one vimage at a time, and the loopback 205118611Snjl * ifnet, loif, is itself virtualized. 206118611Snjl * It would otherwise be possible to seriously hose IGMP state, 207118611Snjl * and create inconsistencies in upstream multicast routing, if you have 208118611Snjl * multiple VIMAGEs running on the same link joining different multicast 209118611Snjl * groups, UNLESS the "primary IP address" is different. This is because 210118611Snjl * IGMP for IPv4 does not force link-local addresses to be used for each 211118611Snjl * node, unlike MLD for IPv6. 212250838Sjkim * Obviously the IGMPv3 per-interface state has per-vimage granularity 213118611Snjl * also as a result. 214118611Snjl * 215118611Snjl * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 216118611Snjl * policy to control the address used by IGMP on the link. 217118611Snjl */ 218118611Snjlstatic VNET_DEFINE(int, interface_timers_running); /* IGMPv3 general 219118611Snjl * query response */ 220250838Sjkimstatic VNET_DEFINE(int, state_change_timers_running); /* IGMPv3 state-change 221118611Snjl * retransmit */ 222118611Snjlstatic VNET_DEFINE(int, current_state_timers_running); /* IGMPv1/v2 host 223118611Snjl * report; IGMPv3 g/sg 224118611Snjl * query response */ 225118611Snjl 226118611Snjl#define V_interface_timers_running VNET(interface_timers_running) 227118611Snjl#define V_state_change_timers_running VNET(state_change_timers_running) 228209746Sjkim#define V_current_state_timers_running VNET(current_state_timers_running) 229209746Sjkim 230233250Sjkimstatic VNET_DEFINE(LIST_HEAD(, igmp_ifsoftc), igi_head) = 231209746Sjkim LIST_HEAD_INITIALIZER(igi_head); 232233250Sjkimstatic VNET_DEFINE(struct igmpstat, igmpstat) = { 233118611Snjl .igps_version = IGPS_VERSION_3, 234233250Sjkim .igps_len = sizeof(struct igmpstat), 235233250Sjkim}; 236233250Sjkimstatic VNET_DEFINE(struct timeval, igmp_gsrdelay) = {10, 0}; 237233250Sjkim 238233250Sjkim#define V_igi_head VNET(igi_head) 239216471Sjkim#define V_igmpstat VNET(igmpstat) 240233250Sjkim#define V_igmp_gsrdelay VNET(igmp_gsrdelay) 241233250Sjkim 242233250Sjkimstatic VNET_DEFINE(int, igmp_recvifkludge) = 1; 243216471Sjkimstatic VNET_DEFINE(int, igmp_sendra) = 1; 244233250Sjkimstatic VNET_DEFINE(int, igmp_sendlocal) = 1; 245233250Sjkimstatic VNET_DEFINE(int, igmp_v1enable) = 1; 246233250Sjkimstatic VNET_DEFINE(int, igmp_v2enable) = 1; 247233250Sjkimstatic VNET_DEFINE(int, igmp_legacysupp); 248233250Sjkimstatic VNET_DEFINE(int, igmp_default_version) = IGMP_VERSION_3; 249233250Sjkim 250233250Sjkim#define V_igmp_recvifkludge VNET(igmp_recvifkludge) 251216471Sjkim#define V_igmp_sendra VNET(igmp_sendra) 252216471Sjkim#define V_igmp_sendlocal VNET(igmp_sendlocal) 253216471Sjkim#define V_igmp_v1enable VNET(igmp_v1enable) 254118611Snjl#define V_igmp_v2enable VNET(igmp_v2enable) 255118611Snjl#define V_igmp_legacysupp VNET(igmp_legacysupp) 256118611Snjl#define V_igmp_default_version VNET(igmp_default_version) 257118611Snjl 258118611Snjl/* 259118611Snjl * Virtualized sysctls. 260118611Snjl */ 261118611SnjlSYSCTL_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_VNET | CTLFLAG_RW, 262118611Snjl &VNET_NAME(igmpstat), igmpstat, ""); 263118611SnjlSYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 264118611Snjl &VNET_NAME(igmp_recvifkludge), 0, 265234623Sjkim "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 266118611SnjlSYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 267118611Snjl &VNET_NAME(igmp_sendra), 0, 268118611Snjl "Send IP Router Alert option in IGMPv2/v3 messages"); 269233250SjkimSYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 270233250Sjkim &VNET_NAME(igmp_sendlocal), 0, 271233250Sjkim "Send IGMP membership reports for 224.0.0.0/24 groups"); 272233250SjkimSYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 273233250Sjkim &VNET_NAME(igmp_v1enable), 0, 274233250Sjkim "Enable backwards compatibility with IGMPv1"); 275233250SjkimSYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 276234623Sjkim &VNET_NAME(igmp_v2enable), 0, 277118611Snjl "Enable backwards compatibility with IGMPv2"); 278216471SjkimSYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 279233250Sjkim &VNET_NAME(igmp_legacysupp), 0, 280233250Sjkim "Allow v1/v2 reports to suppress v3 group responses"); 281233250SjkimSYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 282216471Sjkim CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 283233250Sjkim &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 284118611Snjl "Default version of IGMP to run on each interface"); 285233250SjkimSYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 286233250Sjkim CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 287233250Sjkim &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 288233250Sjkim "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 289233250Sjkim 290233250Sjkim/* 291233250Sjkim * Non-virtualized sysctls. 292216471Sjkim */ 293216471Sjkimstatic SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 294233250Sjkim CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 295216471Sjkim "Per-interface IGMPv3 state"); 296216471Sjkim 297233250Sjkimstatic __inline void 298216471Sjkimigmp_save_context(struct mbuf *m, struct ifnet *ifp) 299216471Sjkim{ 300243347Sjkim 301233250Sjkim#ifdef VIMAGE 302233250Sjkim m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 303233250Sjkim#endif /* VIMAGE */ 304233250Sjkim m->m_pkthdr.rcvif = ifp; 305233250Sjkim m->m_pkthdr.flowid = ifp->if_index; 306240716Sjkim} 307240716Sjkim 308249112Sjkimstatic __inline void 309249112Sjkimigmp_scrub_context(struct mbuf *m) 310249112Sjkim{ 311240716Sjkim 312249112Sjkim m->m_pkthdr.PH_loc.ptr = NULL; 313243347Sjkim m->m_pkthdr.flowid = 0; 314249112Sjkim} 315249112Sjkim 316249112Sjkim/* 317249112Sjkim * Restore context from a queued IGMP output chain. 318249112Sjkim * Return saved ifindex. 319249112Sjkim * 320249112Sjkim * VIMAGE: The assertion is there to make sure that we 321243347Sjkim * actually called CURVNET_SET() with what's in the mbuf chain. 322249112Sjkim */ 323249112Sjkimstatic __inline uint32_t 324249112Sjkimigmp_restore_context(struct mbuf *m) 325249112Sjkim{ 326249112Sjkim 327249112Sjkim#ifdef notyet 328243347Sjkim#if defined(VIMAGE) && defined(INVARIANTS) 329240716Sjkim KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 330243347Sjkim ("%s: called when curvnet was not restored", __func__)); 331243347Sjkim#endif 332243347Sjkim#endif 333243347Sjkim return (m->m_pkthdr.flowid); 334243347Sjkim} 335243347Sjkim 336243347Sjkim/* 337240716Sjkim * Retrieve or set default IGMP version. 338240716Sjkim * 339233250Sjkim * VIMAGE: Assume curvnet set by caller. 340216471Sjkim * SMPng: NOTE: Serialized by IGMP lock. 341118611Snjl */ 342233250Sjkimstatic int 343233250Sjkimsysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 344118611Snjl{ 345118611Snjl int error; 346118611Snjl int new; 347118611Snjl 348118611Snjl error = sysctl_wire_old_buffer(req, sizeof(int)); 349235945Sjkim if (error) 350235945Sjkim return (error); 351235945Sjkim 352235945Sjkim IGMP_LOCK(); 353118611Snjl 354118611Snjl new = V_igmp_default_version; 355118611Snjl 356118611Snjl error = sysctl_handle_int(oidp, &new, 0, req); 357235945Sjkim if (error || !req->newptr) 358235945Sjkim goto out_locked; 359118611Snjl 360118611Snjl if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 361118611Snjl error = EINVAL; 362118611Snjl goto out_locked; 363118611Snjl } 364118611Snjl 365118611Snjl CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 366118611Snjl V_igmp_default_version, new); 367118611Snjl 368118611Snjl V_igmp_default_version = new; 369118611Snjl 370118611Snjlout_locked: 371118611Snjl IGMP_UNLOCK(); 372118611Snjl return (error); 373235945Sjkim} 374235945Sjkim 375237412Sjkim/* 376235945Sjkim * Retrieve or set threshold between group-source queries in seconds. 377235945Sjkim * 378235945Sjkim * VIMAGE: Assume curvnet set by caller. 379235945Sjkim * SMPng: NOTE: Serialized by IGMP lock. 380235945Sjkim */ 381235945Sjkimstatic int 382235945Sjkimsysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 383235945Sjkim{ 384235945Sjkim int error; 385118611Snjl int i; 386118611Snjl 387118611Snjl error = sysctl_wire_old_buffer(req, sizeof(int)); 388118611Snjl if (error) 389118611Snjl return (error); 390118611Snjl 391228110Sjkim IGMP_LOCK(); 392228110Sjkim 393228110Sjkim i = V_igmp_gsrdelay.tv_sec; 394228110Sjkim 395228110Sjkim error = sysctl_handle_int(oidp, &i, 0, req); 396228110Sjkim if (error || !req->newptr) 397228110Sjkim goto out_locked; 398118611Snjl 399118611Snjl if (i < -1 || i >= 60) { 400118611Snjl error = EINVAL; 401228110Sjkim goto out_locked; 402228110Sjkim } 403118611Snjl 404228110Sjkim CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 405228110Sjkim V_igmp_gsrdelay.tv_sec, i); 406228110Sjkim V_igmp_gsrdelay.tv_sec = i; 407228110Sjkim 408118611Snjlout_locked: 409118611Snjl IGMP_UNLOCK(); 410118611Snjl return (error); 411118611Snjl} 412118611Snjl 413216471Sjkim/* 414118611Snjl * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 415240716Sjkim * For use by ifmcstat(8). 416118611Snjl * 417240716Sjkim * SMPng: NOTE: Does an unlocked ifindex space read. 418240716Sjkim * VIMAGE: Assume curvnet set by caller. The node handler itself 419118611Snjl * is not directly virtualized. 420118611Snjl */ 421118611Snjlstatic int 422240716Sjkimsysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 423240716Sjkim{ 424240716Sjkim int *name; 425240716Sjkim int error; 426240716Sjkim u_int namelen; 427240716Sjkim struct ifnet *ifp; 428240716Sjkim struct igmp_ifsoftc *igi; 429240716Sjkim 430240716Sjkim name = (int *)arg1; 431240716Sjkim namelen = arg2; 432240716Sjkim 433240716Sjkim if (req->newptr != NULL) 434240716Sjkim return (EPERM); 435240716Sjkim 436240716Sjkim if (namelen != 1) 437118611Snjl return (EINVAL); 438118611Snjl 439118611Snjl error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 440118611Snjl if (error) 441118611Snjl return (error); 442118611Snjl 443118611Snjl IN_MULTI_LOCK(); 444118611Snjl IGMP_LOCK(); 445118611Snjl 446118611Snjl if (name[0] <= 0 || name[0] > V_if_index) { 447118611Snjl error = ENOENT; 448118611Snjl goto out_locked; 449118611Snjl } 450118611Snjl 451216471Sjkim error = ENOENT; 452216471Sjkim 453216471Sjkim ifp = ifnet_byindex(name[0]); 454216471Sjkim if (ifp == NULL) 455216471Sjkim goto out_locked; 456118611Snjl 457118611Snjl LIST_FOREACH(igi, &V_igi_head, igi_link) { 458118611Snjl if (ifp == igi->igi_ifp) { 459118611Snjl struct igmp_ifinfo info; 460118611Snjl 461118611Snjl info.igi_version = igi->igi_version; 462118611Snjl info.igi_v1_timer = igi->igi_v1_timer; 463118611Snjl info.igi_v2_timer = igi->igi_v2_timer; 464151937Sjkim info.igi_v3_timer = igi->igi_v3_timer; 465118611Snjl info.igi_flags = igi->igi_flags; 466118611Snjl info.igi_rv = igi->igi_rv; 467118611Snjl info.igi_qi = igi->igi_qi; 468118611Snjl info.igi_qri = igi->igi_qri; 469118611Snjl info.igi_uri = igi->igi_uri; 470118611Snjl error = SYSCTL_OUT(req, &info, sizeof(info)); 471118611Snjl break; 472118611Snjl } 473118611Snjl } 474118611Snjl 475118611Snjlout_locked: 476118611Snjl IGMP_UNLOCK(); 477118611Snjl IN_MULTI_UNLOCK(); 478118611Snjl return (error); 479118611Snjl} 480118611Snjl 481118611Snjl/* 482118611Snjl * Dispatch an entire queue of pending packet chains 483118611Snjl * using the netisr. 484118611Snjl * VIMAGE: Assumes the vnet pointer has been set. 485118611Snjl */ 486118611Snjlstatic void 487118611Snjligmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 488118611Snjl{ 489118611Snjl struct mbuf *m; 490118611Snjl 491118611Snjl while ((m = mbufq_dequeue(mq)) != NULL) { 492118611Snjl CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 493118611Snjl if (loop) 494118611Snjl m->m_flags |= M_IGMP_LOOP; 495118611Snjl netisr_dispatch(NETISR_IGMP, m); 496118611Snjl if (--limit == 0) 497118611Snjl break; 498118611Snjl } 499118611Snjl} 500118611Snjl 501233250Sjkim/* 502233250Sjkim * Filter outgoing IGMP report state by group. 503233250Sjkim * 504233250Sjkim * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 505233250Sjkim * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 506233250Sjkim * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 507233250Sjkim * this may break certain IGMP snooping switches which rely on the old 508233250Sjkim * report behaviour. 509233250Sjkim * 510233250Sjkim * Return zero if the given group is one for which IGMP reports 511233250Sjkim * should be suppressed, or non-zero if reports should be issued. 512233250Sjkim */ 513233250Sjkimstatic __inline int 514233250Sjkimigmp_isgroupreported(const struct in_addr addr) 515233250Sjkim{ 516233250Sjkim 517233250Sjkim if (in_allhosts(addr) || 518233250Sjkim ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 519233250Sjkim return (0); 520233250Sjkim 521233250Sjkim return (1); 522233250Sjkim} 523233250Sjkim 524233250Sjkim/* 525233250Sjkim * Construct a Router Alert option to use in outgoing packets. 526233250Sjkim */ 527233250Sjkimstatic struct mbuf * 528233250Sjkimigmp_ra_alloc(void) 529233250Sjkim{ 530233250Sjkim struct mbuf *m; 531233250Sjkim struct ipoption *p; 532233250Sjkim 533233250Sjkim m = m_get(M_WAITOK, MT_DATA); 534233250Sjkim p = mtod(m, struct ipoption *); 535233250Sjkim p->ipopt_dst.s_addr = INADDR_ANY; 536233250Sjkim p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 537233250Sjkim p->ipopt_list[1] = 0x04; /* 4 bytes long */ 538233250Sjkim p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 539233250Sjkim p->ipopt_list[3] = 0x00; /* pad byte */ 540233250Sjkim m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 541233250Sjkim 542233250Sjkim return (m); 543233250Sjkim} 544233250Sjkim 545233250Sjkim/* 546233250Sjkim * Attach IGMP when PF_INET is attached to an interface. 547233250Sjkim */ 548233250Sjkimstruct igmp_ifsoftc * 549233250Sjkimigmp_domifattach(struct ifnet *ifp) 550233250Sjkim{ 551233250Sjkim struct igmp_ifsoftc *igi; 552233250Sjkim 553233250Sjkim CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 554233250Sjkim __func__, ifp, ifp->if_xname); 555233250Sjkim 556233250Sjkim IGMP_LOCK(); 557233250Sjkim 558233250Sjkim igi = igi_alloc_locked(ifp); 559233250Sjkim if (!(ifp->if_flags & IFF_MULTICAST)) 560233250Sjkim igi->igi_flags |= IGIF_SILENT; 561233250Sjkim 562233250Sjkim IGMP_UNLOCK(); 563233250Sjkim 564233250Sjkim return (igi); 565233250Sjkim} 566233250Sjkim 567233250Sjkim/* 568233250Sjkim * VIMAGE: assume curvnet set by caller. 569233250Sjkim */ 570233250Sjkimstatic struct igmp_ifsoftc * 571233250Sjkimigi_alloc_locked(/*const*/ struct ifnet *ifp) 572233250Sjkim{ 573233250Sjkim struct igmp_ifsoftc *igi; 574233250Sjkim 575233250Sjkim IGMP_LOCK_ASSERT(); 576233250Sjkim 577233250Sjkim igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 578233250Sjkim if (igi == NULL) 579233250Sjkim goto out; 580233250Sjkim 581233250Sjkim igi->igi_ifp = ifp; 582233250Sjkim igi->igi_version = V_igmp_default_version; 583233250Sjkim igi->igi_flags = 0; 584233250Sjkim igi->igi_rv = IGMP_RV_INIT; 585233250Sjkim igi->igi_qi = IGMP_QI_INIT; 586118611Snjl igi->igi_qri = IGMP_QRI_INIT; 587118611Snjl igi->igi_uri = IGMP_URI_INIT; 588118611Snjl SLIST_INIT(&igi->igi_relinmhead); 589118611Snjl mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 590118611Snjl 591118611Snjl LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 592118611Snjl 593118611Snjl CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 594118611Snjl ifp, ifp->if_xname); 595118611Snjl 596118611Snjlout: 597151937Sjkim return (igi); 598118611Snjl} 599118611Snjl 600118611Snjl/* 601118611Snjl * Hook for ifdetach. 602118611Snjl * 603118611Snjl * NOTE: Some finalization tasks need to run before the protocol domain 604118611Snjl * is detached, but also before the link layer does its cleanup. 605118611Snjl * 606118611Snjl * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 607118611Snjl * XXX This is also bitten by unlocked ifma_protospec access. 608118611Snjl */ 609118611Snjlvoid 610118611Snjligmp_ifdetach(struct ifnet *ifp) 611118611Snjl{ 612118611Snjl struct igmp_ifsoftc *igi; 613118611Snjl struct ifmultiaddr *ifma; 614118611Snjl struct in_multi *inm, *tinm; 615118611Snjl 616118611Snjl CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 617118611Snjl ifp->if_xname); 618118611Snjl 619118611Snjl IGMP_LOCK(); 620118611Snjl 621118611Snjl igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 622118611Snjl if (igi->igi_version == IGMP_VERSION_3) { 623118611Snjl IF_ADDR_RLOCK(ifp); 624118611Snjl TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 625118611Snjl if (ifma->ifma_addr->sa_family != AF_INET || 626118611Snjl ifma->ifma_protospec == NULL) 627118611Snjl continue; 628118611Snjl#if 0 629118611Snjl KASSERT(ifma->ifma_protospec != NULL, 630118611Snjl ("%s: ifma_protospec is NULL", __func__)); 631118611Snjl#endif 632118611Snjl inm = (struct in_multi *)ifma->ifma_protospec; 633118611Snjl if (inm->inm_state == IGMP_LEAVING_MEMBER) { 634118611Snjl SLIST_INSERT_HEAD(&igi->igi_relinmhead, 635118611Snjl inm, inm_nrele); 636118611Snjl } 637118611Snjl inm_clear_recorded(inm); 638118611Snjl } 639118611Snjl IF_ADDR_RUNLOCK(ifp); 640118611Snjl /* 641118611Snjl * Free the in_multi reference(s) for this IGMP lifecycle. 642118611Snjl */ 643118611Snjl SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele, 644118611Snjl tinm) { 645118611Snjl SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele); 646118611Snjl inm_release_locked(inm); 647118611Snjl } 648118611Snjl } 649118611Snjl 650118611Snjl IGMP_UNLOCK(); 651118611Snjl} 652233250Sjkim 653118611Snjl/* 654118611Snjl * Hook for domifdetach. 655118611Snjl */ 656118611Snjlvoid 657118611Snjligmp_domifdetach(struct ifnet *ifp) 658118611Snjl{ 659118611Snjl 660118611Snjl CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 661118611Snjl __func__, ifp, ifp->if_xname); 662118611Snjl 663118611Snjl IGMP_LOCK(); 664118611Snjl igi_delete_locked(ifp); 665118611Snjl IGMP_UNLOCK(); 666118611Snjl} 667118611Snjl 668209746Sjkimstatic void 669118611Snjligi_delete_locked(const struct ifnet *ifp) 670118611Snjl{ 671118611Snjl struct igmp_ifsoftc *igi, *tigi; 672118611Snjl 673199337Sjkim CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 674118611Snjl __func__, ifp, ifp->if_xname); 675118611Snjl 676118611Snjl IGMP_LOCK_ASSERT(); 677118611Snjl 678118611Snjl LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 679118611Snjl if (igi->igi_ifp == ifp) { 680118611Snjl /* 681118611Snjl * Free deferred General Query responses. 682250838Sjkim */ 683250838Sjkim mbufq_drain(&igi->igi_gq); 684250838Sjkim 685250838Sjkim LIST_REMOVE(igi, igi_link); 686250838Sjkim 687250838Sjkim KASSERT(SLIST_EMPTY(&igi->igi_relinmhead), 688250838Sjkim ("%s: there are dangling in_multi references", 689250838Sjkim __func__)); 690250838Sjkim 691250838Sjkim free(igi, M_IGMP); 692250838Sjkim return; 693250838Sjkim } 694250838Sjkim } 695250838Sjkim} 696250838Sjkim 697250838Sjkim/* 698250838Sjkim * Process a received IGMPv1 query. 699250838Sjkim * Return non-zero if the message should be dropped. 700250838Sjkim * 701250838Sjkim * VIMAGE: The curvnet pointer is derived from the input ifp. 702250838Sjkim */ 703250838Sjkimstatic int 704250838Sjkimigmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 705250838Sjkim const struct igmp *igmp) 706250838Sjkim{ 707250838Sjkim struct ifmultiaddr *ifma; 708250838Sjkim struct igmp_ifsoftc *igi; 709250838Sjkim struct in_multi *inm; 710250838Sjkim 711250838Sjkim /* 712250838Sjkim * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 713250838Sjkim * 224.0.0.1. They are always treated as General Queries. 714250838Sjkim * igmp_group is always ignored. Do not drop it as a userland 715250838Sjkim * daemon may wish to see it. 716250838Sjkim * XXX SMPng: unlocked increments in igmpstat assumed atomic. 717250838Sjkim */ 718250838Sjkim if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 719250838Sjkim IGMPSTAT_INC(igps_rcv_badqueries); 720250838Sjkim return (0); 721250838Sjkim } 722250838Sjkim IGMPSTAT_INC(igps_rcv_gen_queries); 723250838Sjkim 724250838Sjkim IN_MULTI_LOCK(); 725250838Sjkim IGMP_LOCK(); 726250838Sjkim 727250838Sjkim igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 728250838Sjkim KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 729250838Sjkim 730250838Sjkim if (igi->igi_flags & IGIF_LOOPBACK) { 731250838Sjkim CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 732250838Sjkim ifp, ifp->if_xname); 733250838Sjkim goto out_locked; 734250838Sjkim } 735250838Sjkim 736250838Sjkim /* 737250838Sjkim * Switch to IGMPv1 host compatibility mode. 738250838Sjkim */ 739250838Sjkim igmp_set_version(igi, IGMP_VERSION_1); 740250838Sjkim 741250838Sjkim CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 742250838Sjkim 743250838Sjkim /* 744250838Sjkim * Start the timers in all of our group records 745250838Sjkim * for the interface on which the query arrived, 746250838Sjkim * except those which are already running. 747250838Sjkim */ 748250838Sjkim IF_ADDR_RLOCK(ifp); 749250838Sjkim TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 750250838Sjkim if (ifma->ifma_addr->sa_family != AF_INET || 751250838Sjkim ifma->ifma_protospec == NULL) 752250838Sjkim continue; 753250838Sjkim inm = (struct in_multi *)ifma->ifma_protospec; 754250838Sjkim if (inm->inm_timer != 0) 755250838Sjkim continue; 756250838Sjkim switch (inm->inm_state) { 757250838Sjkim case IGMP_NOT_MEMBER: 758250838Sjkim case IGMP_SILENT_MEMBER: 759250838Sjkim break; 760250838Sjkim case IGMP_G_QUERY_PENDING_MEMBER: 761250838Sjkim case IGMP_SG_QUERY_PENDING_MEMBER: 762250838Sjkim case IGMP_REPORTING_MEMBER: 763250838Sjkim case IGMP_IDLE_MEMBER: 764250838Sjkim case IGMP_LAZY_MEMBER: 765250838Sjkim case IGMP_SLEEPING_MEMBER: 766250838Sjkim case IGMP_AWAKENING_MEMBER: 767250838Sjkim inm->inm_state = IGMP_REPORTING_MEMBER; 768250838Sjkim inm->inm_timer = IGMP_RANDOM_DELAY( 769250838Sjkim IGMP_V1V2_MAX_RI * PR_FASTHZ); 770250838Sjkim V_current_state_timers_running = 1; 771250838Sjkim break; 772250838Sjkim case IGMP_LEAVING_MEMBER: 773250838Sjkim break; 774250838Sjkim } 775250838Sjkim } 776250838Sjkim IF_ADDR_RUNLOCK(ifp); 777250838Sjkim 778250838Sjkimout_locked: 779250838Sjkim IGMP_UNLOCK(); 780250838Sjkim IN_MULTI_UNLOCK(); 781250838Sjkim 782250838Sjkim return (0); 783250838Sjkim} 784250838Sjkim 785250838Sjkim/* 786250838Sjkim * Process a received IGMPv2 general or group-specific query. 787250838Sjkim */ 788250838Sjkimstatic int 789118611Snjligmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 790118611Snjl const struct igmp *igmp) 791118611Snjl{ 792118611Snjl struct ifmultiaddr *ifma; 793118611Snjl struct igmp_ifsoftc *igi; 794118611Snjl struct in_multi *inm; 795118611Snjl int is_general_query; 796118611Snjl uint16_t timer; 797118611Snjl 798118611Snjl is_general_query = 0; 799118611Snjl 800118611Snjl /* 801118611Snjl * Validate address fields upfront. 802118611Snjl * XXX SMPng: unlocked increments in igmpstat assumed atomic. 803118611Snjl */ 804118611Snjl if (in_nullhost(igmp->igmp_group)) { 805118611Snjl /* 806118611Snjl * IGMPv2 General Query. 807118611Snjl * If this was not sent to the all-hosts group, ignore it. 808118611Snjl */ 809118611Snjl if (!in_allhosts(ip->ip_dst)) 810118611Snjl return (0); 811250838Sjkim IGMPSTAT_INC(igps_rcv_gen_queries); 812250838Sjkim is_general_query = 1; 813250838Sjkim } else { 814167802Sjkim /* IGMPv2 Group-Specific Query. */ 815250838Sjkim IGMPSTAT_INC(igps_rcv_group_queries); 816167802Sjkim } 817167802Sjkim 818118611Snjl IN_MULTI_LOCK(); 819118611Snjl IGMP_LOCK(); 820118611Snjl 821250838Sjkim igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 822250838Sjkim KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 823250838Sjkim 824250838Sjkim if (igi->igi_flags & IGIF_LOOPBACK) { 825118611Snjl CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 826118611Snjl ifp, ifp->if_xname); 827118611Snjl goto out_locked; 828118611Snjl } 829250838Sjkim 830118611Snjl /* 831118611Snjl * Ignore v2 query if in v1 Compatibility Mode. 832118611Snjl */ 833118611Snjl if (igi->igi_version == IGMP_VERSION_1) 834118611Snjl goto out_locked; 835118611Snjl 836118611Snjl igmp_set_version(igi, IGMP_VERSION_2); 837118611Snjl 838118611Snjl timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE; 839118611Snjl if (timer == 0) 840118611Snjl timer = 1; 841118611Snjl 842118611Snjl if (is_general_query) { 843118611Snjl /* 844118611Snjl * For each reporting group joined on this 845118611Snjl * interface, kick the report timer. 846118611Snjl */ 847118611Snjl CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 848118611Snjl ifp, ifp->if_xname); 849118611Snjl IF_ADDR_RLOCK(ifp); 850118611Snjl TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 851118611Snjl if (ifma->ifma_addr->sa_family != AF_INET || 852118611Snjl ifma->ifma_protospec == NULL) 853118611Snjl continue; 854118611Snjl inm = (struct in_multi *)ifma->ifma_protospec; 855118611Snjl igmp_v2_update_group(inm, timer); 856118611Snjl } 857118611Snjl IF_ADDR_RUNLOCK(ifp); 858118611Snjl } else { 859118611Snjl /* 860118611Snjl * Group-specific IGMPv2 query, we need only 861118611Snjl * look up the single group to process it. 862118611Snjl */ 863118611Snjl inm = inm_lookup(ifp, igmp->igmp_group); 864118611Snjl if (inm != NULL) { 865118611Snjl CTR3(KTR_IGMPV3, 866118611Snjl "process v2 query 0x%08x on ifp %p(%s)", 867118611Snjl ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 868118611Snjl igmp_v2_update_group(inm, timer); 869118611Snjl } 870118611Snjl } 871118611Snjl 872118611Snjlout_locked: 873118611Snjl IGMP_UNLOCK(); 874118611Snjl IN_MULTI_UNLOCK(); 875118611Snjl 876118611Snjl return (0); 877118611Snjl} 878118611Snjl 879118611Snjl/* 880118611Snjl * Update the report timer on a group in response to an IGMPv2 query. 881118611Snjl * 882118611Snjl * If we are becoming the reporting member for this group, start the timer. 883118611Snjl * If we already are the reporting member for this group, and timer is 884118611Snjl * below the threshold, reset it. 885118611Snjl * 886118611Snjl * We may be updating the group for the first time since we switched 887151937Sjkim * to IGMPv3. If we are, then we must clear any recorded source lists, 888118611Snjl * and transition to REPORTING state; the group timer is overloaded 889118611Snjl * for group and group-source query responses. 890151937Sjkim * 891151937Sjkim * Unlike IGMPv3, the delay per group should be jittered 892118611Snjl * to avoid bursts of IGMPv2 reports. 893118611Snjl */ 894118611Snjlstatic void 895118611Snjligmp_v2_update_group(struct in_multi *inm, const int timer) 896118611Snjl{ 897228110Sjkim 898118611Snjl CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 899118611Snjl ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 900118611Snjl 901228110Sjkim IN_MULTI_LOCK_ASSERT(); 902228110Sjkim 903228110Sjkim switch (inm->inm_state) { 904118611Snjl case IGMP_NOT_MEMBER: 905241973Sjkim case IGMP_SILENT_MEMBER: 906118611Snjl break; 907 case IGMP_REPORTING_MEMBER: 908 if (inm->inm_timer != 0 && 909 inm->inm_timer <= timer) { 910 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 911 "skipping.", __func__); 912 break; 913 } 914 /* FALLTHROUGH */ 915 case IGMP_SG_QUERY_PENDING_MEMBER: 916 case IGMP_G_QUERY_PENDING_MEMBER: 917 case IGMP_IDLE_MEMBER: 918 case IGMP_LAZY_MEMBER: 919 case IGMP_AWAKENING_MEMBER: 920 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 921 inm->inm_state = IGMP_REPORTING_MEMBER; 922 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 923 V_current_state_timers_running = 1; 924 break; 925 case IGMP_SLEEPING_MEMBER: 926 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 927 inm->inm_state = IGMP_AWAKENING_MEMBER; 928 break; 929 case IGMP_LEAVING_MEMBER: 930 break; 931 } 932} 933 934/* 935 * Process a received IGMPv3 general, group-specific or 936 * group-and-source-specific query. 937 * Assumes m has already been pulled up to the full IGMP message length. 938 * Return 0 if successful, otherwise an appropriate error code is returned. 939 */ 940static int 941igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 942 /*const*/ struct igmpv3 *igmpv3) 943{ 944 struct igmp_ifsoftc *igi; 945 struct in_multi *inm; 946 int is_general_query; 947 uint32_t maxresp, nsrc, qqi; 948 uint16_t timer; 949 uint8_t qrv; 950 951 is_general_query = 0; 952 953 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 954 955 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 956 if (maxresp >= 128) { 957 maxresp = IGMP_MANT(igmpv3->igmp_code) << 958 (IGMP_EXP(igmpv3->igmp_code) + 3); 959 } 960 961 /* 962 * Robustness must never be less than 2 for on-wire IGMPv3. 963 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 964 * an exception for interfaces whose IGMPv3 state changes 965 * are redirected to loopback (e.g. MANET). 966 */ 967 qrv = IGMP_QRV(igmpv3->igmp_misc); 968 if (qrv < 2) { 969 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 970 qrv, IGMP_RV_INIT); 971 qrv = IGMP_RV_INIT; 972 } 973 974 qqi = igmpv3->igmp_qqi; 975 if (qqi >= 128) { 976 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 977 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 978 } 979 980 timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE; 981 if (timer == 0) 982 timer = 1; 983 984 nsrc = ntohs(igmpv3->igmp_numsrc); 985 986 /* 987 * Validate address fields and versions upfront before 988 * accepting v3 query. 989 * XXX SMPng: Unlocked access to igmpstat counters here. 990 */ 991 if (in_nullhost(igmpv3->igmp_group)) { 992 /* 993 * IGMPv3 General Query. 994 * 995 * General Queries SHOULD be directed to 224.0.0.1. 996 * A general query with a source list has undefined 997 * behaviour; discard it. 998 */ 999 IGMPSTAT_INC(igps_rcv_gen_queries); 1000 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1001 IGMPSTAT_INC(igps_rcv_badqueries); 1002 return (0); 1003 } 1004 is_general_query = 1; 1005 } else { 1006 /* Group or group-source specific query. */ 1007 if (nsrc == 0) 1008 IGMPSTAT_INC(igps_rcv_group_queries); 1009 else 1010 IGMPSTAT_INC(igps_rcv_gsr_queries); 1011 } 1012 1013 IN_MULTI_LOCK(); 1014 IGMP_LOCK(); 1015 1016 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1017 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1018 1019 if (igi->igi_flags & IGIF_LOOPBACK) { 1020 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1021 ifp, ifp->if_xname); 1022 goto out_locked; 1023 } 1024 1025 /* 1026 * Discard the v3 query if we're in Compatibility Mode. 1027 * The RFC is not obviously worded that hosts need to stay in 1028 * compatibility mode until the Old Version Querier Present 1029 * timer expires. 1030 */ 1031 if (igi->igi_version != IGMP_VERSION_3) { 1032 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1033 igi->igi_version, ifp, ifp->if_xname); 1034 goto out_locked; 1035 } 1036 1037 igmp_set_version(igi, IGMP_VERSION_3); 1038 igi->igi_rv = qrv; 1039 igi->igi_qi = qqi; 1040 igi->igi_qri = maxresp; 1041 1042 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1043 maxresp); 1044 1045 if (is_general_query) { 1046 /* 1047 * Schedule a current-state report on this ifp for 1048 * all groups, possibly containing source lists. 1049 * If there is a pending General Query response 1050 * scheduled earlier than the selected delay, do 1051 * not schedule any other reports. 1052 * Otherwise, reset the interface timer. 1053 */ 1054 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1055 ifp, ifp->if_xname); 1056 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1057 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1058 V_interface_timers_running = 1; 1059 } 1060 } else { 1061 /* 1062 * Group-source-specific queries are throttled on 1063 * a per-group basis to defeat denial-of-service attempts. 1064 * Queries for groups we are not a member of on this 1065 * link are simply ignored. 1066 */ 1067 inm = inm_lookup(ifp, igmpv3->igmp_group); 1068 if (inm == NULL) 1069 goto out_locked; 1070 if (nsrc > 0) { 1071 if (!ratecheck(&inm->inm_lastgsrtv, 1072 &V_igmp_gsrdelay)) { 1073 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1074 __func__); 1075 IGMPSTAT_INC(igps_drop_gsr_queries); 1076 goto out_locked; 1077 } 1078 } 1079 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1080 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1081 /* 1082 * If there is a pending General Query response 1083 * scheduled sooner than the selected delay, no 1084 * further report need be scheduled. 1085 * Otherwise, prepare to respond to the 1086 * group-specific or group-and-source query. 1087 */ 1088 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1089 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1090 } 1091 1092out_locked: 1093 IGMP_UNLOCK(); 1094 IN_MULTI_UNLOCK(); 1095 1096 return (0); 1097} 1098 1099/* 1100 * Process a received IGMPv3 group-specific or group-and-source-specific 1101 * query. 1102 * Return <0 if any error occurred. Currently this is ignored. 1103 */ 1104static int 1105igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1106 int timer, /*const*/ struct igmpv3 *igmpv3) 1107{ 1108 int retval; 1109 uint16_t nsrc; 1110 1111 IN_MULTI_LOCK_ASSERT(); 1112 IGMP_LOCK_ASSERT(); 1113 1114 retval = 0; 1115 1116 switch (inm->inm_state) { 1117 case IGMP_NOT_MEMBER: 1118 case IGMP_SILENT_MEMBER: 1119 case IGMP_SLEEPING_MEMBER: 1120 case IGMP_LAZY_MEMBER: 1121 case IGMP_AWAKENING_MEMBER: 1122 case IGMP_IDLE_MEMBER: 1123 case IGMP_LEAVING_MEMBER: 1124 return (retval); 1125 break; 1126 case IGMP_REPORTING_MEMBER: 1127 case IGMP_G_QUERY_PENDING_MEMBER: 1128 case IGMP_SG_QUERY_PENDING_MEMBER: 1129 break; 1130 } 1131 1132 nsrc = ntohs(igmpv3->igmp_numsrc); 1133 1134 /* 1135 * Deal with group-specific queries upfront. 1136 * If any group query is already pending, purge any recorded 1137 * source-list state if it exists, and schedule a query response 1138 * for this group-specific query. 1139 */ 1140 if (nsrc == 0) { 1141 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1142 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1143 inm_clear_recorded(inm); 1144 timer = min(inm->inm_timer, timer); 1145 } 1146 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1147 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1148 V_current_state_timers_running = 1; 1149 return (retval); 1150 } 1151 1152 /* 1153 * Deal with the case where a group-and-source-specific query has 1154 * been received but a group-specific query is already pending. 1155 */ 1156 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1157 timer = min(inm->inm_timer, timer); 1158 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1159 V_current_state_timers_running = 1; 1160 return (retval); 1161 } 1162 1163 /* 1164 * Finally, deal with the case where a group-and-source-specific 1165 * query has been received, where a response to a previous g-s-r 1166 * query exists, or none exists. 1167 * In this case, we need to parse the source-list which the Querier 1168 * has provided us with and check if we have any source list filter 1169 * entries at T1 for these sources. If we do not, there is no need 1170 * schedule a report and the query may be dropped. 1171 * If we do, we must record them and schedule a current-state 1172 * report for those sources. 1173 * FIXME: Handling source lists larger than 1 mbuf requires that 1174 * we pass the mbuf chain pointer down to this function, and use 1175 * m_getptr() to walk the chain. 1176 */ 1177 if (inm->inm_nsrc > 0) { 1178 const struct in_addr *ap; 1179 int i, nrecorded; 1180 1181 ap = (const struct in_addr *)(igmpv3 + 1); 1182 nrecorded = 0; 1183 for (i = 0; i < nsrc; i++, ap++) { 1184 retval = inm_record_source(inm, ap->s_addr); 1185 if (retval < 0) 1186 break; 1187 nrecorded += retval; 1188 } 1189 if (nrecorded > 0) { 1190 CTR1(KTR_IGMPV3, 1191 "%s: schedule response to SG query", __func__); 1192 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1193 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1194 V_current_state_timers_running = 1; 1195 } 1196 } 1197 1198 return (retval); 1199} 1200 1201/* 1202 * Process a received IGMPv1 host membership report. 1203 * 1204 * NOTE: 0.0.0.0 workaround breaks const correctness. 1205 */ 1206static int 1207igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1208 /*const*/ struct igmp *igmp) 1209{ 1210 struct rm_priotracker in_ifa_tracker; 1211 struct in_ifaddr *ia; 1212 struct in_multi *inm; 1213 1214 IGMPSTAT_INC(igps_rcv_reports); 1215 1216 if (ifp->if_flags & IFF_LOOPBACK) 1217 return (0); 1218 1219 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1220 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1221 IGMPSTAT_INC(igps_rcv_badreports); 1222 return (EINVAL); 1223 } 1224 1225 /* 1226 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1227 * Booting clients may use the source address 0.0.0.0. Some 1228 * IGMP daemons may not know how to use IP_RECVIF to determine 1229 * the interface upon which this message was received. 1230 * Replace 0.0.0.0 with the subnet address if told to do so. 1231 */ 1232 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1233 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1234 if (ia != NULL) { 1235 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1236 ifa_free(&ia->ia_ifa); 1237 } 1238 } 1239 1240 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1241 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1242 1243 /* 1244 * IGMPv1 report suppression. 1245 * If we are a member of this group, and our membership should be 1246 * reported, stop our group timer and transition to the 'lazy' state. 1247 */ 1248 IN_MULTI_LOCK(); 1249 inm = inm_lookup(ifp, igmp->igmp_group); 1250 if (inm != NULL) { 1251 struct igmp_ifsoftc *igi; 1252 1253 igi = inm->inm_igi; 1254 if (igi == NULL) { 1255 KASSERT(igi != NULL, 1256 ("%s: no igi for ifp %p", __func__, ifp)); 1257 goto out_locked; 1258 } 1259 1260 IGMPSTAT_INC(igps_rcv_ourreports); 1261 1262 /* 1263 * If we are in IGMPv3 host mode, do not allow the 1264 * other host's IGMPv1 report to suppress our reports 1265 * unless explicitly configured to do so. 1266 */ 1267 if (igi->igi_version == IGMP_VERSION_3) { 1268 if (V_igmp_legacysupp) 1269 igmp_v3_suppress_group_record(inm); 1270 goto out_locked; 1271 } 1272 1273 inm->inm_timer = 0; 1274 1275 switch (inm->inm_state) { 1276 case IGMP_NOT_MEMBER: 1277 case IGMP_SILENT_MEMBER: 1278 break; 1279 case IGMP_IDLE_MEMBER: 1280 case IGMP_LAZY_MEMBER: 1281 case IGMP_AWAKENING_MEMBER: 1282 CTR3(KTR_IGMPV3, 1283 "report suppressed for 0x%08x on ifp %p(%s)", 1284 ntohl(igmp->igmp_group.s_addr), ifp, 1285 ifp->if_xname); 1286 case IGMP_SLEEPING_MEMBER: 1287 inm->inm_state = IGMP_SLEEPING_MEMBER; 1288 break; 1289 case IGMP_REPORTING_MEMBER: 1290 CTR3(KTR_IGMPV3, 1291 "report suppressed for 0x%08x on ifp %p(%s)", 1292 ntohl(igmp->igmp_group.s_addr), ifp, 1293 ifp->if_xname); 1294 if (igi->igi_version == IGMP_VERSION_1) 1295 inm->inm_state = IGMP_LAZY_MEMBER; 1296 else if (igi->igi_version == IGMP_VERSION_2) 1297 inm->inm_state = IGMP_SLEEPING_MEMBER; 1298 break; 1299 case IGMP_G_QUERY_PENDING_MEMBER: 1300 case IGMP_SG_QUERY_PENDING_MEMBER: 1301 case IGMP_LEAVING_MEMBER: 1302 break; 1303 } 1304 } 1305 1306out_locked: 1307 IN_MULTI_UNLOCK(); 1308 1309 return (0); 1310} 1311 1312/* 1313 * Process a received IGMPv2 host membership report. 1314 * 1315 * NOTE: 0.0.0.0 workaround breaks const correctness. 1316 */ 1317static int 1318igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1319 /*const*/ struct igmp *igmp) 1320{ 1321 struct rm_priotracker in_ifa_tracker; 1322 struct in_ifaddr *ia; 1323 struct in_multi *inm; 1324 1325 /* 1326 * Make sure we don't hear our own membership report. Fast 1327 * leave requires knowing that we are the only member of a 1328 * group. 1329 */ 1330 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1331 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1332 ifa_free(&ia->ia_ifa); 1333 return (0); 1334 } 1335 1336 IGMPSTAT_INC(igps_rcv_reports); 1337 1338 if (ifp->if_flags & IFF_LOOPBACK) { 1339 if (ia != NULL) 1340 ifa_free(&ia->ia_ifa); 1341 return (0); 1342 } 1343 1344 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1345 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1346 if (ia != NULL) 1347 ifa_free(&ia->ia_ifa); 1348 IGMPSTAT_INC(igps_rcv_badreports); 1349 return (EINVAL); 1350 } 1351 1352 /* 1353 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1354 * Booting clients may use the source address 0.0.0.0. Some 1355 * IGMP daemons may not know how to use IP_RECVIF to determine 1356 * the interface upon which this message was received. 1357 * Replace 0.0.0.0 with the subnet address if told to do so. 1358 */ 1359 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1360 if (ia != NULL) 1361 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1362 } 1363 if (ia != NULL) 1364 ifa_free(&ia->ia_ifa); 1365 1366 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1367 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1368 1369 /* 1370 * IGMPv2 report suppression. 1371 * If we are a member of this group, and our membership should be 1372 * reported, and our group timer is pending or about to be reset, 1373 * stop our group timer by transitioning to the 'lazy' state. 1374 */ 1375 IN_MULTI_LOCK(); 1376 inm = inm_lookup(ifp, igmp->igmp_group); 1377 if (inm != NULL) { 1378 struct igmp_ifsoftc *igi; 1379 1380 igi = inm->inm_igi; 1381 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1382 1383 IGMPSTAT_INC(igps_rcv_ourreports); 1384 1385 /* 1386 * If we are in IGMPv3 host mode, do not allow the 1387 * other host's IGMPv1 report to suppress our reports 1388 * unless explicitly configured to do so. 1389 */ 1390 if (igi->igi_version == IGMP_VERSION_3) { 1391 if (V_igmp_legacysupp) 1392 igmp_v3_suppress_group_record(inm); 1393 goto out_locked; 1394 } 1395 1396 inm->inm_timer = 0; 1397 1398 switch (inm->inm_state) { 1399 case IGMP_NOT_MEMBER: 1400 case IGMP_SILENT_MEMBER: 1401 case IGMP_SLEEPING_MEMBER: 1402 break; 1403 case IGMP_REPORTING_MEMBER: 1404 case IGMP_IDLE_MEMBER: 1405 case IGMP_AWAKENING_MEMBER: 1406 CTR3(KTR_IGMPV3, 1407 "report suppressed for 0x%08x on ifp %p(%s)", 1408 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1409 case IGMP_LAZY_MEMBER: 1410 inm->inm_state = IGMP_LAZY_MEMBER; 1411 break; 1412 case IGMP_G_QUERY_PENDING_MEMBER: 1413 case IGMP_SG_QUERY_PENDING_MEMBER: 1414 case IGMP_LEAVING_MEMBER: 1415 break; 1416 } 1417 } 1418 1419out_locked: 1420 IN_MULTI_UNLOCK(); 1421 1422 return (0); 1423} 1424 1425int 1426igmp_input(struct mbuf **mp, int *offp, int proto) 1427{ 1428 int iphlen; 1429 struct ifnet *ifp; 1430 struct igmp *igmp; 1431 struct ip *ip; 1432 struct mbuf *m; 1433 int igmplen; 1434 int minlen; 1435 int queryver; 1436 1437 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1438 1439 m = *mp; 1440 ifp = m->m_pkthdr.rcvif; 1441 *mp = NULL; 1442 1443 IGMPSTAT_INC(igps_rcv_total); 1444 1445 ip = mtod(m, struct ip *); 1446 iphlen = *offp; 1447 igmplen = ntohs(ip->ip_len) - iphlen; 1448 1449 /* 1450 * Validate lengths. 1451 */ 1452 if (igmplen < IGMP_MINLEN) { 1453 IGMPSTAT_INC(igps_rcv_tooshort); 1454 m_freem(m); 1455 return (IPPROTO_DONE); 1456 } 1457 1458 /* 1459 * Always pullup to the minimum size for v1/v2 or v3 1460 * to amortize calls to m_pullup(). 1461 */ 1462 minlen = iphlen; 1463 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1464 minlen += IGMP_V3_QUERY_MINLEN; 1465 else 1466 minlen += IGMP_MINLEN; 1467 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1468 (m = m_pullup(m, minlen)) == NULL) { 1469 IGMPSTAT_INC(igps_rcv_tooshort); 1470 return (IPPROTO_DONE); 1471 } 1472 ip = mtod(m, struct ip *); 1473 1474 /* 1475 * Validate checksum. 1476 */ 1477 m->m_data += iphlen; 1478 m->m_len -= iphlen; 1479 igmp = mtod(m, struct igmp *); 1480 if (in_cksum(m, igmplen)) { 1481 IGMPSTAT_INC(igps_rcv_badsum); 1482 m_freem(m); 1483 return (IPPROTO_DONE); 1484 } 1485 m->m_data -= iphlen; 1486 m->m_len += iphlen; 1487 1488 /* 1489 * IGMP control traffic is link-scope, and must have a TTL of 1. 1490 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1491 * probe packets may come from beyond the LAN. 1492 */ 1493 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1494 IGMPSTAT_INC(igps_rcv_badttl); 1495 m_freem(m); 1496 return (IPPROTO_DONE); 1497 } 1498 1499 switch (igmp->igmp_type) { 1500 case IGMP_HOST_MEMBERSHIP_QUERY: 1501 if (igmplen == IGMP_MINLEN) { 1502 if (igmp->igmp_code == 0) 1503 queryver = IGMP_VERSION_1; 1504 else 1505 queryver = IGMP_VERSION_2; 1506 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1507 queryver = IGMP_VERSION_3; 1508 } else { 1509 IGMPSTAT_INC(igps_rcv_tooshort); 1510 m_freem(m); 1511 return (IPPROTO_DONE); 1512 } 1513 1514 switch (queryver) { 1515 case IGMP_VERSION_1: 1516 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1517 if (!V_igmp_v1enable) 1518 break; 1519 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1520 m_freem(m); 1521 return (IPPROTO_DONE); 1522 } 1523 break; 1524 1525 case IGMP_VERSION_2: 1526 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1527 if (!V_igmp_v2enable) 1528 break; 1529 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1530 m_freem(m); 1531 return (IPPROTO_DONE); 1532 } 1533 break; 1534 1535 case IGMP_VERSION_3: { 1536 struct igmpv3 *igmpv3; 1537 uint16_t igmpv3len; 1538 uint16_t nsrc; 1539 1540 IGMPSTAT_INC(igps_rcv_v3_queries); 1541 igmpv3 = (struct igmpv3 *)igmp; 1542 /* 1543 * Validate length based on source count. 1544 */ 1545 nsrc = ntohs(igmpv3->igmp_numsrc); 1546 if (nsrc * sizeof(in_addr_t) > 1547 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1548 IGMPSTAT_INC(igps_rcv_tooshort); 1549 return (IPPROTO_DONE); 1550 } 1551 /* 1552 * m_pullup() may modify m, so pullup in 1553 * this scope. 1554 */ 1555 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1556 sizeof(struct in_addr) * nsrc; 1557 if ((!M_WRITABLE(m) || 1558 m->m_len < igmpv3len) && 1559 (m = m_pullup(m, igmpv3len)) == NULL) { 1560 IGMPSTAT_INC(igps_rcv_tooshort); 1561 return (IPPROTO_DONE); 1562 } 1563 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1564 + iphlen); 1565 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1566 m_freem(m); 1567 return (IPPROTO_DONE); 1568 } 1569 } 1570 break; 1571 } 1572 break; 1573 1574 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1575 if (!V_igmp_v1enable) 1576 break; 1577 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1578 m_freem(m); 1579 return (IPPROTO_DONE); 1580 } 1581 break; 1582 1583 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1584 if (!V_igmp_v2enable) 1585 break; 1586 if (!ip_checkrouteralert(m)) 1587 IGMPSTAT_INC(igps_rcv_nora); 1588 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1589 m_freem(m); 1590 return (IPPROTO_DONE); 1591 } 1592 break; 1593 1594 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1595 /* 1596 * Hosts do not need to process IGMPv3 membership reports, 1597 * as report suppression is no longer required. 1598 */ 1599 if (!ip_checkrouteralert(m)) 1600 IGMPSTAT_INC(igps_rcv_nora); 1601 break; 1602 1603 default: 1604 break; 1605 } 1606 1607 /* 1608 * Pass all valid IGMP packets up to any process(es) listening on a 1609 * raw IGMP socket. 1610 */ 1611 *mp = m; 1612 return (rip_input(mp, offp, proto)); 1613} 1614 1615 1616/* 1617 * Fast timeout handler (global). 1618 * VIMAGE: Timeout handlers are expected to service all vimages. 1619 */ 1620void 1621igmp_fasttimo(void) 1622{ 1623 VNET_ITERATOR_DECL(vnet_iter); 1624 1625 VNET_LIST_RLOCK_NOSLEEP(); 1626 VNET_FOREACH(vnet_iter) { 1627 CURVNET_SET(vnet_iter); 1628 igmp_fasttimo_vnet(); 1629 CURVNET_RESTORE(); 1630 } 1631 VNET_LIST_RUNLOCK_NOSLEEP(); 1632} 1633 1634/* 1635 * Fast timeout handler (per-vnet). 1636 * Sends are shuffled off to a netisr to deal with Giant. 1637 * 1638 * VIMAGE: Assume caller has set up our curvnet. 1639 */ 1640static void 1641igmp_fasttimo_vnet(void) 1642{ 1643 struct mbufq scq; /* State-change packets */ 1644 struct mbufq qrq; /* Query response packets */ 1645 struct ifnet *ifp; 1646 struct igmp_ifsoftc *igi; 1647 struct ifmultiaddr *ifma; 1648 struct in_multi *inm; 1649 int loop, uri_fasthz; 1650 1651 loop = 0; 1652 uri_fasthz = 0; 1653 1654 /* 1655 * Quick check to see if any work needs to be done, in order to 1656 * minimize the overhead of fasttimo processing. 1657 * SMPng: XXX Unlocked reads. 1658 */ 1659 if (!V_current_state_timers_running && 1660 !V_interface_timers_running && 1661 !V_state_change_timers_running) 1662 return; 1663 1664 IN_MULTI_LOCK(); 1665 IGMP_LOCK(); 1666 1667 /* 1668 * IGMPv3 General Query response timer processing. 1669 */ 1670 if (V_interface_timers_running) { 1671 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1672 1673 V_interface_timers_running = 0; 1674 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1675 if (igi->igi_v3_timer == 0) { 1676 /* Do nothing. */ 1677 } else if (--igi->igi_v3_timer == 0) { 1678 igmp_v3_dispatch_general_query(igi); 1679 } else { 1680 V_interface_timers_running = 1; 1681 } 1682 } 1683 } 1684 1685 if (!V_current_state_timers_running && 1686 !V_state_change_timers_running) 1687 goto out_locked; 1688 1689 V_current_state_timers_running = 0; 1690 V_state_change_timers_running = 0; 1691 1692 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1693 1694 /* 1695 * IGMPv1/v2/v3 host report and state-change timer processing. 1696 * Note: Processing a v3 group timer may remove a node. 1697 */ 1698 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1699 ifp = igi->igi_ifp; 1700 1701 if (igi->igi_version == IGMP_VERSION_3) { 1702 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1703 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1704 PR_FASTHZ); 1705 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1706 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1707 } 1708 1709 IF_ADDR_RLOCK(ifp); 1710 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1711 if (ifma->ifma_addr->sa_family != AF_INET || 1712 ifma->ifma_protospec == NULL) 1713 continue; 1714 inm = (struct in_multi *)ifma->ifma_protospec; 1715 switch (igi->igi_version) { 1716 case IGMP_VERSION_1: 1717 case IGMP_VERSION_2: 1718 igmp_v1v2_process_group_timer(inm, 1719 igi->igi_version); 1720 break; 1721 case IGMP_VERSION_3: 1722 igmp_v3_process_group_timers(igi, &qrq, 1723 &scq, inm, uri_fasthz); 1724 break; 1725 } 1726 } 1727 IF_ADDR_RUNLOCK(ifp); 1728 1729 if (igi->igi_version == IGMP_VERSION_3) { 1730 struct in_multi *tinm; 1731 1732 igmp_dispatch_queue(&qrq, 0, loop); 1733 igmp_dispatch_queue(&scq, 0, loop); 1734 1735 /* 1736 * Free the in_multi reference(s) for this 1737 * IGMP lifecycle. 1738 */ 1739 SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, 1740 inm_nrele, tinm) { 1741 SLIST_REMOVE_HEAD(&igi->igi_relinmhead, 1742 inm_nrele); 1743 inm_release_locked(inm); 1744 } 1745 } 1746 } 1747 1748out_locked: 1749 IGMP_UNLOCK(); 1750 IN_MULTI_UNLOCK(); 1751} 1752 1753/* 1754 * Update host report group timer for IGMPv1/v2. 1755 * Will update the global pending timer flags. 1756 */ 1757static void 1758igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1759{ 1760 int report_timer_expired; 1761 1762 IN_MULTI_LOCK_ASSERT(); 1763 IGMP_LOCK_ASSERT(); 1764 1765 if (inm->inm_timer == 0) { 1766 report_timer_expired = 0; 1767 } else if (--inm->inm_timer == 0) { 1768 report_timer_expired = 1; 1769 } else { 1770 V_current_state_timers_running = 1; 1771 return; 1772 } 1773 1774 switch (inm->inm_state) { 1775 case IGMP_NOT_MEMBER: 1776 case IGMP_SILENT_MEMBER: 1777 case IGMP_IDLE_MEMBER: 1778 case IGMP_LAZY_MEMBER: 1779 case IGMP_SLEEPING_MEMBER: 1780 case IGMP_AWAKENING_MEMBER: 1781 break; 1782 case IGMP_REPORTING_MEMBER: 1783 if (report_timer_expired) { 1784 inm->inm_state = IGMP_IDLE_MEMBER; 1785 (void)igmp_v1v2_queue_report(inm, 1786 (version == IGMP_VERSION_2) ? 1787 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1788 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1789 } 1790 break; 1791 case IGMP_G_QUERY_PENDING_MEMBER: 1792 case IGMP_SG_QUERY_PENDING_MEMBER: 1793 case IGMP_LEAVING_MEMBER: 1794 break; 1795 } 1796} 1797 1798/* 1799 * Update a group's timers for IGMPv3. 1800 * Will update the global pending timer flags. 1801 * Note: Unlocked read from igi. 1802 */ 1803static void 1804igmp_v3_process_group_timers(struct igmp_ifsoftc *igi, 1805 struct mbufq *qrq, struct mbufq *scq, 1806 struct in_multi *inm, const int uri_fasthz) 1807{ 1808 int query_response_timer_expired; 1809 int state_change_retransmit_timer_expired; 1810 1811 IN_MULTI_LOCK_ASSERT(); 1812 IGMP_LOCK_ASSERT(); 1813 1814 query_response_timer_expired = 0; 1815 state_change_retransmit_timer_expired = 0; 1816 1817 /* 1818 * During a transition from v1/v2 compatibility mode back to v3, 1819 * a group record in REPORTING state may still have its group 1820 * timer active. This is a no-op in this function; it is easier 1821 * to deal with it here than to complicate the slow-timeout path. 1822 */ 1823 if (inm->inm_timer == 0) { 1824 query_response_timer_expired = 0; 1825 } else if (--inm->inm_timer == 0) { 1826 query_response_timer_expired = 1; 1827 } else { 1828 V_current_state_timers_running = 1; 1829 } 1830 1831 if (inm->inm_sctimer == 0) { 1832 state_change_retransmit_timer_expired = 0; 1833 } else if (--inm->inm_sctimer == 0) { 1834 state_change_retransmit_timer_expired = 1; 1835 } else { 1836 V_state_change_timers_running = 1; 1837 } 1838 1839 /* We are in fasttimo, so be quick about it. */ 1840 if (!state_change_retransmit_timer_expired && 1841 !query_response_timer_expired) 1842 return; 1843 1844 switch (inm->inm_state) { 1845 case IGMP_NOT_MEMBER: 1846 case IGMP_SILENT_MEMBER: 1847 case IGMP_SLEEPING_MEMBER: 1848 case IGMP_LAZY_MEMBER: 1849 case IGMP_AWAKENING_MEMBER: 1850 case IGMP_IDLE_MEMBER: 1851 break; 1852 case IGMP_G_QUERY_PENDING_MEMBER: 1853 case IGMP_SG_QUERY_PENDING_MEMBER: 1854 /* 1855 * Respond to a previously pending Group-Specific 1856 * or Group-and-Source-Specific query by enqueueing 1857 * the appropriate Current-State report for 1858 * immediate transmission. 1859 */ 1860 if (query_response_timer_expired) { 1861 int retval; 1862 1863 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1864 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1865 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1866 __func__, retval); 1867 inm->inm_state = IGMP_REPORTING_MEMBER; 1868 /* XXX Clear recorded sources for next time. */ 1869 inm_clear_recorded(inm); 1870 } 1871 /* FALLTHROUGH */ 1872 case IGMP_REPORTING_MEMBER: 1873 case IGMP_LEAVING_MEMBER: 1874 if (state_change_retransmit_timer_expired) { 1875 /* 1876 * State-change retransmission timer fired. 1877 * If there are any further pending retransmissions, 1878 * set the global pending state-change flag, and 1879 * reset the timer. 1880 */ 1881 if (--inm->inm_scrv > 0) { 1882 inm->inm_sctimer = uri_fasthz; 1883 V_state_change_timers_running = 1; 1884 } 1885 /* 1886 * Retransmit the previously computed state-change 1887 * report. If there are no further pending 1888 * retransmissions, the mbuf queue will be consumed. 1889 * Update T0 state to T1 as we have now sent 1890 * a state-change. 1891 */ 1892 (void)igmp_v3_merge_state_changes(inm, scq); 1893 1894 inm_commit(inm); 1895 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1896 ntohl(inm->inm_addr.s_addr), 1897 inm->inm_ifp->if_xname); 1898 1899 /* 1900 * If we are leaving the group for good, make sure 1901 * we release IGMP's reference to it. 1902 * This release must be deferred using a SLIST, 1903 * as we are called from a loop which traverses 1904 * the in_ifmultiaddr TAILQ. 1905 */ 1906 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1907 inm->inm_scrv == 0) { 1908 inm->inm_state = IGMP_NOT_MEMBER; 1909 SLIST_INSERT_HEAD(&igi->igi_relinmhead, 1910 inm, inm_nrele); 1911 } 1912 } 1913 break; 1914 } 1915} 1916 1917 1918/* 1919 * Suppress a group's pending response to a group or source/group query. 1920 * 1921 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1922 * Do NOT update ST1/ST0 as this operation merely suppresses 1923 * the currently pending group record. 1924 * Do NOT suppress the response to a general query. It is possible but 1925 * it would require adding another state or flag. 1926 */ 1927static void 1928igmp_v3_suppress_group_record(struct in_multi *inm) 1929{ 1930 1931 IN_MULTI_LOCK_ASSERT(); 1932 1933 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1934 ("%s: not IGMPv3 mode on link", __func__)); 1935 1936 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1937 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1938 return; 1939 1940 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1941 inm_clear_recorded(inm); 1942 1943 inm->inm_timer = 0; 1944 inm->inm_state = IGMP_REPORTING_MEMBER; 1945} 1946 1947/* 1948 * Switch to a different IGMP version on the given interface, 1949 * as per Section 7.2.1. 1950 */ 1951static void 1952igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1953{ 1954 int old_version_timer; 1955 1956 IGMP_LOCK_ASSERT(); 1957 1958 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1959 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1960 1961 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1962 /* 1963 * Compute the "Older Version Querier Present" timer as per 1964 * Section 8.12. 1965 */ 1966 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 1967 old_version_timer *= PR_SLOWHZ; 1968 1969 if (version == IGMP_VERSION_1) { 1970 igi->igi_v1_timer = old_version_timer; 1971 igi->igi_v2_timer = 0; 1972 } else if (version == IGMP_VERSION_2) { 1973 igi->igi_v1_timer = 0; 1974 igi->igi_v2_timer = old_version_timer; 1975 } 1976 } 1977 1978 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 1979 if (igi->igi_version != IGMP_VERSION_2) { 1980 igi->igi_version = IGMP_VERSION_2; 1981 igmp_v3_cancel_link_timers(igi); 1982 } 1983 } else if (igi->igi_v1_timer > 0) { 1984 if (igi->igi_version != IGMP_VERSION_1) { 1985 igi->igi_version = IGMP_VERSION_1; 1986 igmp_v3_cancel_link_timers(igi); 1987 } 1988 } 1989} 1990 1991/* 1992 * Cancel pending IGMPv3 timers for the given link and all groups 1993 * joined on it; state-change, general-query, and group-query timers. 1994 * 1995 * Only ever called on a transition from v3 to Compatibility mode. Kill 1996 * the timers stone dead (this may be expensive for large N groups), they 1997 * will be restarted if Compatibility Mode deems that they must be due to 1998 * query processing. 1999 */ 2000static void 2001igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2002{ 2003 struct ifmultiaddr *ifma; 2004 struct ifnet *ifp; 2005 struct in_multi *inm, *tinm; 2006 2007 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2008 igi->igi_ifp, igi->igi_ifp->if_xname); 2009 2010 IN_MULTI_LOCK_ASSERT(); 2011 IGMP_LOCK_ASSERT(); 2012 2013 /* 2014 * Stop the v3 General Query Response on this link stone dead. 2015 * If fasttimo is woken up due to V_interface_timers_running, 2016 * the flag will be cleared if there are no pending link timers. 2017 */ 2018 igi->igi_v3_timer = 0; 2019 2020 /* 2021 * Now clear the current-state and state-change report timers 2022 * for all memberships scoped to this link. 2023 */ 2024 ifp = igi->igi_ifp; 2025 IF_ADDR_RLOCK(ifp); 2026 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2027 if (ifma->ifma_addr->sa_family != AF_INET || 2028 ifma->ifma_protospec == NULL) 2029 continue; 2030 inm = (struct in_multi *)ifma->ifma_protospec; 2031 switch (inm->inm_state) { 2032 case IGMP_NOT_MEMBER: 2033 case IGMP_SILENT_MEMBER: 2034 case IGMP_IDLE_MEMBER: 2035 case IGMP_LAZY_MEMBER: 2036 case IGMP_SLEEPING_MEMBER: 2037 case IGMP_AWAKENING_MEMBER: 2038 /* 2039 * These states are either not relevant in v3 mode, 2040 * or are unreported. Do nothing. 2041 */ 2042 break; 2043 case IGMP_LEAVING_MEMBER: 2044 /* 2045 * If we are leaving the group and switching to 2046 * compatibility mode, we need to release the final 2047 * reference held for issuing the INCLUDE {}, and 2048 * transition to REPORTING to ensure the host leave 2049 * message is sent upstream to the old querier -- 2050 * transition to NOT would lose the leave and race. 2051 */ 2052 SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele); 2053 /* FALLTHROUGH */ 2054 case IGMP_G_QUERY_PENDING_MEMBER: 2055 case IGMP_SG_QUERY_PENDING_MEMBER: 2056 inm_clear_recorded(inm); 2057 /* FALLTHROUGH */ 2058 case IGMP_REPORTING_MEMBER: 2059 inm->inm_state = IGMP_REPORTING_MEMBER; 2060 break; 2061 } 2062 /* 2063 * Always clear state-change and group report timers. 2064 * Free any pending IGMPv3 state-change records. 2065 */ 2066 inm->inm_sctimer = 0; 2067 inm->inm_timer = 0; 2068 mbufq_drain(&inm->inm_scq); 2069 } 2070 IF_ADDR_RUNLOCK(ifp); 2071 SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele, tinm) { 2072 SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele); 2073 inm_release_locked(inm); 2074 } 2075} 2076 2077/* 2078 * Update the Older Version Querier Present timers for a link. 2079 * See Section 7.2.1 of RFC 3376. 2080 */ 2081static void 2082igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2083{ 2084 2085 IGMP_LOCK_ASSERT(); 2086 2087 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2088 /* 2089 * IGMPv1 and IGMPv2 Querier Present timers expired. 2090 * 2091 * Revert to IGMPv3. 2092 */ 2093 if (igi->igi_version != IGMP_VERSION_3) { 2094 CTR5(KTR_IGMPV3, 2095 "%s: transition from v%d -> v%d on %p(%s)", 2096 __func__, igi->igi_version, IGMP_VERSION_3, 2097 igi->igi_ifp, igi->igi_ifp->if_xname); 2098 igi->igi_version = IGMP_VERSION_3; 2099 } 2100 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2101 /* 2102 * IGMPv1 Querier Present timer expired, 2103 * IGMPv2 Querier Present timer running. 2104 * If IGMPv2 was disabled since last timeout, 2105 * revert to IGMPv3. 2106 * If IGMPv2 is enabled, revert to IGMPv2. 2107 */ 2108 if (!V_igmp_v2enable) { 2109 CTR5(KTR_IGMPV3, 2110 "%s: transition from v%d -> v%d on %p(%s)", 2111 __func__, igi->igi_version, IGMP_VERSION_3, 2112 igi->igi_ifp, igi->igi_ifp->if_xname); 2113 igi->igi_v2_timer = 0; 2114 igi->igi_version = IGMP_VERSION_3; 2115 } else { 2116 --igi->igi_v2_timer; 2117 if (igi->igi_version != IGMP_VERSION_2) { 2118 CTR5(KTR_IGMPV3, 2119 "%s: transition from v%d -> v%d on %p(%s)", 2120 __func__, igi->igi_version, IGMP_VERSION_2, 2121 igi->igi_ifp, igi->igi_ifp->if_xname); 2122 igi->igi_version = IGMP_VERSION_2; 2123 igmp_v3_cancel_link_timers(igi); 2124 } 2125 } 2126 } else if (igi->igi_v1_timer > 0) { 2127 /* 2128 * IGMPv1 Querier Present timer running. 2129 * Stop IGMPv2 timer if running. 2130 * 2131 * If IGMPv1 was disabled since last timeout, 2132 * revert to IGMPv3. 2133 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2134 */ 2135 if (!V_igmp_v1enable) { 2136 CTR5(KTR_IGMPV3, 2137 "%s: transition from v%d -> v%d on %p(%s)", 2138 __func__, igi->igi_version, IGMP_VERSION_3, 2139 igi->igi_ifp, igi->igi_ifp->if_xname); 2140 igi->igi_v1_timer = 0; 2141 igi->igi_version = IGMP_VERSION_3; 2142 } else { 2143 --igi->igi_v1_timer; 2144 } 2145 if (igi->igi_v2_timer > 0) { 2146 CTR3(KTR_IGMPV3, 2147 "%s: cancel v2 timer on %p(%s)", 2148 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2149 igi->igi_v2_timer = 0; 2150 } 2151 } 2152} 2153 2154/* 2155 * Global slowtimo handler. 2156 * VIMAGE: Timeout handlers are expected to service all vimages. 2157 */ 2158void 2159igmp_slowtimo(void) 2160{ 2161 VNET_ITERATOR_DECL(vnet_iter); 2162 2163 VNET_LIST_RLOCK_NOSLEEP(); 2164 VNET_FOREACH(vnet_iter) { 2165 CURVNET_SET(vnet_iter); 2166 igmp_slowtimo_vnet(); 2167 CURVNET_RESTORE(); 2168 } 2169 VNET_LIST_RUNLOCK_NOSLEEP(); 2170} 2171 2172/* 2173 * Per-vnet slowtimo handler. 2174 */ 2175static void 2176igmp_slowtimo_vnet(void) 2177{ 2178 struct igmp_ifsoftc *igi; 2179 2180 IGMP_LOCK(); 2181 2182 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2183 igmp_v1v2_process_querier_timers(igi); 2184 } 2185 2186 IGMP_UNLOCK(); 2187} 2188 2189/* 2190 * Dispatch an IGMPv1/v2 host report or leave message. 2191 * These are always small enough to fit inside a single mbuf. 2192 */ 2193static int 2194igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2195{ 2196 struct ifnet *ifp; 2197 struct igmp *igmp; 2198 struct ip *ip; 2199 struct mbuf *m; 2200 2201 IN_MULTI_LOCK_ASSERT(); 2202 IGMP_LOCK_ASSERT(); 2203 2204 ifp = inm->inm_ifp; 2205 2206 m = m_gethdr(M_NOWAIT, MT_DATA); 2207 if (m == NULL) 2208 return (ENOMEM); 2209 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2210 2211 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2212 2213 m->m_data += sizeof(struct ip); 2214 m->m_len = sizeof(struct igmp); 2215 2216 igmp = mtod(m, struct igmp *); 2217 igmp->igmp_type = type; 2218 igmp->igmp_code = 0; 2219 igmp->igmp_group = inm->inm_addr; 2220 igmp->igmp_cksum = 0; 2221 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2222 2223 m->m_data -= sizeof(struct ip); 2224 m->m_len += sizeof(struct ip); 2225 2226 ip = mtod(m, struct ip *); 2227 ip->ip_tos = 0; 2228 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2229 ip->ip_off = 0; 2230 ip->ip_p = IPPROTO_IGMP; 2231 ip->ip_src.s_addr = INADDR_ANY; 2232 2233 if (type == IGMP_HOST_LEAVE_MESSAGE) 2234 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2235 else 2236 ip->ip_dst = inm->inm_addr; 2237 2238 igmp_save_context(m, ifp); 2239 2240 m->m_flags |= M_IGMPV2; 2241 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2242 m->m_flags |= M_IGMP_LOOP; 2243 2244 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2245 netisr_dispatch(NETISR_IGMP, m); 2246 2247 return (0); 2248} 2249 2250/* 2251 * Process a state change from the upper layer for the given IPv4 group. 2252 * 2253 * Each socket holds a reference on the in_multi in its own ip_moptions. 2254 * The socket layer will have made the necessary updates to.the group 2255 * state, it is now up to IGMP to issue a state change report if there 2256 * has been any change between T0 (when the last state-change was issued) 2257 * and T1 (now). 2258 * 2259 * We use the IGMPv3 state machine at group level. The IGMP module 2260 * however makes the decision as to which IGMP protocol version to speak. 2261 * A state change *from* INCLUDE {} always means an initial join. 2262 * A state change *to* INCLUDE {} always means a final leave. 2263 * 2264 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2265 * save ourselves a bunch of work; any exclusive mode groups need not 2266 * compute source filter lists. 2267 * 2268 * VIMAGE: curvnet should have been set by caller, as this routine 2269 * is called from the socket option handlers. 2270 */ 2271int 2272igmp_change_state(struct in_multi *inm) 2273{ 2274 struct igmp_ifsoftc *igi; 2275 struct ifnet *ifp; 2276 int error; 2277 2278 IN_MULTI_LOCK_ASSERT(); 2279 2280 error = 0; 2281 2282 /* 2283 * Try to detect if the upper layer just asked us to change state 2284 * for an interface which has now gone away. 2285 */ 2286 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2287 ifp = inm->inm_ifma->ifma_ifp; 2288 /* 2289 * Sanity check that netinet's notion of ifp is the 2290 * same as net's. 2291 */ 2292 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2293 2294 IGMP_LOCK(); 2295 2296 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2297 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2298 2299 /* 2300 * If we detect a state transition to or from MCAST_UNDEFINED 2301 * for this group, then we are starting or finishing an IGMP 2302 * life cycle for this group. 2303 */ 2304 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2305 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2306 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2307 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2308 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2309 error = igmp_initial_join(inm, igi); 2310 goto out_locked; 2311 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2312 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2313 igmp_final_leave(inm, igi); 2314 goto out_locked; 2315 } 2316 } else { 2317 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2318 } 2319 2320 error = igmp_handle_state_change(inm, igi); 2321 2322out_locked: 2323 IGMP_UNLOCK(); 2324 return (error); 2325} 2326 2327/* 2328 * Perform the initial join for an IGMP group. 2329 * 2330 * When joining a group: 2331 * If the group should have its IGMP traffic suppressed, do nothing. 2332 * IGMPv1 starts sending IGMPv1 host membership reports. 2333 * IGMPv2 starts sending IGMPv2 host membership reports. 2334 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2335 * initial state of the membership. 2336 */ 2337static int 2338igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2339{ 2340 struct ifnet *ifp; 2341 struct mbufq *mq; 2342 int error, retval, syncstates; 2343 2344 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2345 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2346 2347 error = 0; 2348 syncstates = 1; 2349 2350 ifp = inm->inm_ifp; 2351 2352 IN_MULTI_LOCK_ASSERT(); 2353 IGMP_LOCK_ASSERT(); 2354 2355 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2356 2357 /* 2358 * Groups joined on loopback or marked as 'not reported', 2359 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2360 * are never reported in any IGMP protocol exchanges. 2361 * All other groups enter the appropriate IGMP state machine 2362 * for the version in use on this link. 2363 * A link marked as IGIF_SILENT causes IGMP to be completely 2364 * disabled for the link. 2365 */ 2366 if ((ifp->if_flags & IFF_LOOPBACK) || 2367 (igi->igi_flags & IGIF_SILENT) || 2368 !igmp_isgroupreported(inm->inm_addr)) { 2369 CTR1(KTR_IGMPV3, 2370"%s: not kicking state machine for silent group", __func__); 2371 inm->inm_state = IGMP_SILENT_MEMBER; 2372 inm->inm_timer = 0; 2373 } else { 2374 /* 2375 * Deal with overlapping in_multi lifecycle. 2376 * If this group was LEAVING, then make sure 2377 * we drop the reference we picked up to keep the 2378 * group around for the final INCLUDE {} enqueue. 2379 */ 2380 if (igi->igi_version == IGMP_VERSION_3 && 2381 inm->inm_state == IGMP_LEAVING_MEMBER) 2382 inm_release_locked(inm); 2383 2384 inm->inm_state = IGMP_REPORTING_MEMBER; 2385 2386 switch (igi->igi_version) { 2387 case IGMP_VERSION_1: 2388 case IGMP_VERSION_2: 2389 inm->inm_state = IGMP_IDLE_MEMBER; 2390 error = igmp_v1v2_queue_report(inm, 2391 (igi->igi_version == IGMP_VERSION_2) ? 2392 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2393 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2394 if (error == 0) { 2395 inm->inm_timer = IGMP_RANDOM_DELAY( 2396 IGMP_V1V2_MAX_RI * PR_FASTHZ); 2397 V_current_state_timers_running = 1; 2398 } 2399 break; 2400 2401 case IGMP_VERSION_3: 2402 /* 2403 * Defer update of T0 to T1, until the first copy 2404 * of the state change has been transmitted. 2405 */ 2406 syncstates = 0; 2407 2408 /* 2409 * Immediately enqueue a State-Change Report for 2410 * this interface, freeing any previous reports. 2411 * Don't kick the timers if there is nothing to do, 2412 * or if an error occurred. 2413 */ 2414 mq = &inm->inm_scq; 2415 mbufq_drain(mq); 2416 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2417 0, 0); 2418 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2419 __func__, retval); 2420 if (retval <= 0) { 2421 error = retval * -1; 2422 break; 2423 } 2424 2425 /* 2426 * Schedule transmission of pending state-change 2427 * report up to RV times for this link. The timer 2428 * will fire at the next igmp_fasttimo (~200ms), 2429 * giving us an opportunity to merge the reports. 2430 */ 2431 if (igi->igi_flags & IGIF_LOOPBACK) { 2432 inm->inm_scrv = 1; 2433 } else { 2434 KASSERT(igi->igi_rv > 1, 2435 ("%s: invalid robustness %d", __func__, 2436 igi->igi_rv)); 2437 inm->inm_scrv = igi->igi_rv; 2438 } 2439 inm->inm_sctimer = 1; 2440 V_state_change_timers_running = 1; 2441 2442 error = 0; 2443 break; 2444 } 2445 } 2446 2447 /* 2448 * Only update the T0 state if state change is atomic, 2449 * i.e. we don't need to wait for a timer to fire before we 2450 * can consider the state change to have been communicated. 2451 */ 2452 if (syncstates) { 2453 inm_commit(inm); 2454 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2455 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2456 } 2457 2458 return (error); 2459} 2460 2461/* 2462 * Issue an intermediate state change during the IGMP life-cycle. 2463 */ 2464static int 2465igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2466{ 2467 struct ifnet *ifp; 2468 int retval; 2469 2470 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2471 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2472 2473 ifp = inm->inm_ifp; 2474 2475 IN_MULTI_LOCK_ASSERT(); 2476 IGMP_LOCK_ASSERT(); 2477 2478 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2479 2480 if ((ifp->if_flags & IFF_LOOPBACK) || 2481 (igi->igi_flags & IGIF_SILENT) || 2482 !igmp_isgroupreported(inm->inm_addr) || 2483 (igi->igi_version != IGMP_VERSION_3)) { 2484 if (!igmp_isgroupreported(inm->inm_addr)) { 2485 CTR1(KTR_IGMPV3, 2486"%s: not kicking state machine for silent group", __func__); 2487 } 2488 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2489 inm_commit(inm); 2490 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2491 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2492 return (0); 2493 } 2494 2495 mbufq_drain(&inm->inm_scq); 2496 2497 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2498 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2499 if (retval <= 0) 2500 return (-retval); 2501 2502 /* 2503 * If record(s) were enqueued, start the state-change 2504 * report timer for this group. 2505 */ 2506 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2507 inm->inm_sctimer = 1; 2508 V_state_change_timers_running = 1; 2509 2510 return (0); 2511} 2512 2513/* 2514 * Perform the final leave for an IGMP group. 2515 * 2516 * When leaving a group: 2517 * IGMPv1 does nothing. 2518 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2519 * IGMPv3 enqueues a state-change report containing a transition 2520 * to INCLUDE {} for immediate transmission. 2521 */ 2522static void 2523igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2524{ 2525 int syncstates; 2526 2527 syncstates = 1; 2528 2529 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2530 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2531 inm->inm_ifp->if_xname); 2532 2533 IN_MULTI_LOCK_ASSERT(); 2534 IGMP_LOCK_ASSERT(); 2535 2536 switch (inm->inm_state) { 2537 case IGMP_NOT_MEMBER: 2538 case IGMP_SILENT_MEMBER: 2539 case IGMP_LEAVING_MEMBER: 2540 /* Already leaving or left; do nothing. */ 2541 CTR1(KTR_IGMPV3, 2542"%s: not kicking state machine for silent group", __func__); 2543 break; 2544 case IGMP_REPORTING_MEMBER: 2545 case IGMP_IDLE_MEMBER: 2546 case IGMP_G_QUERY_PENDING_MEMBER: 2547 case IGMP_SG_QUERY_PENDING_MEMBER: 2548 if (igi->igi_version == IGMP_VERSION_2) { 2549#ifdef INVARIANTS 2550 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2551 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2552 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2553 __func__); 2554#endif 2555 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2556 inm->inm_state = IGMP_NOT_MEMBER; 2557 } else if (igi->igi_version == IGMP_VERSION_3) { 2558 /* 2559 * Stop group timer and all pending reports. 2560 * Immediately enqueue a state-change report 2561 * TO_IN {} to be sent on the next fast timeout, 2562 * giving us an opportunity to merge reports. 2563 */ 2564 mbufq_drain(&inm->inm_scq); 2565 inm->inm_timer = 0; 2566 if (igi->igi_flags & IGIF_LOOPBACK) { 2567 inm->inm_scrv = 1; 2568 } else { 2569 inm->inm_scrv = igi->igi_rv; 2570 } 2571 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2572 "pending retransmissions.", __func__, 2573 ntohl(inm->inm_addr.s_addr), 2574 inm->inm_ifp->if_xname, inm->inm_scrv); 2575 if (inm->inm_scrv == 0) { 2576 inm->inm_state = IGMP_NOT_MEMBER; 2577 inm->inm_sctimer = 0; 2578 } else { 2579 int retval; 2580 2581 inm_acquire_locked(inm); 2582 2583 retval = igmp_v3_enqueue_group_record( 2584 &inm->inm_scq, inm, 1, 0, 0); 2585 KASSERT(retval != 0, 2586 ("%s: enqueue record = %d", __func__, 2587 retval)); 2588 2589 inm->inm_state = IGMP_LEAVING_MEMBER; 2590 inm->inm_sctimer = 1; 2591 V_state_change_timers_running = 1; 2592 syncstates = 0; 2593 } 2594 break; 2595 } 2596 break; 2597 case IGMP_LAZY_MEMBER: 2598 case IGMP_SLEEPING_MEMBER: 2599 case IGMP_AWAKENING_MEMBER: 2600 /* Our reports are suppressed; do nothing. */ 2601 break; 2602 } 2603 2604 if (syncstates) { 2605 inm_commit(inm); 2606 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2607 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2608 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2609 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2610 __func__, ntohl(inm->inm_addr.s_addr), 2611 inm->inm_ifp->if_xname); 2612 } 2613} 2614 2615/* 2616 * Enqueue an IGMPv3 group record to the given output queue. 2617 * 2618 * XXX This function could do with having the allocation code 2619 * split out, and the multiple-tree-walks coalesced into a single 2620 * routine as has been done in igmp_v3_enqueue_filter_change(). 2621 * 2622 * If is_state_change is zero, a current-state record is appended. 2623 * If is_state_change is non-zero, a state-change report is appended. 2624 * 2625 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2626 * If is_group_query is zero, and if there is a packet with free space 2627 * at the tail of the queue, it will be appended to providing there 2628 * is enough free space. 2629 * Otherwise a new mbuf packet chain is allocated. 2630 * 2631 * If is_source_query is non-zero, each source is checked to see if 2632 * it was recorded for a Group-Source query, and will be omitted if 2633 * it is not both in-mode and recorded. 2634 * 2635 * The function will attempt to allocate leading space in the packet 2636 * for the IP/IGMP header to be prepended without fragmenting the chain. 2637 * 2638 * If successful the size of all data appended to the queue is returned, 2639 * otherwise an error code less than zero is returned, or zero if 2640 * no record(s) were appended. 2641 */ 2642static int 2643igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2644 const int is_state_change, const int is_group_query, 2645 const int is_source_query) 2646{ 2647 struct igmp_grouprec ig; 2648 struct igmp_grouprec *pig; 2649 struct ifnet *ifp; 2650 struct ip_msource *ims, *nims; 2651 struct mbuf *m0, *m, *md; 2652 int error, is_filter_list_change; 2653 int minrec0len, m0srcs, msrcs, nbytes, off; 2654 int record_has_sources; 2655 int now; 2656 int type; 2657 in_addr_t naddr; 2658 uint8_t mode; 2659 2660 IN_MULTI_LOCK_ASSERT(); 2661 2662 error = 0; 2663 ifp = inm->inm_ifp; 2664 is_filter_list_change = 0; 2665 m = NULL; 2666 m0 = NULL; 2667 m0srcs = 0; 2668 msrcs = 0; 2669 nbytes = 0; 2670 nims = NULL; 2671 record_has_sources = 1; 2672 pig = NULL; 2673 type = IGMP_DO_NOTHING; 2674 mode = inm->inm_st[1].iss_fmode; 2675 2676 /* 2677 * If we did not transition out of ASM mode during t0->t1, 2678 * and there are no source nodes to process, we can skip 2679 * the generation of source records. 2680 */ 2681 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2682 inm->inm_nsrc == 0) 2683 record_has_sources = 0; 2684 2685 if (is_state_change) { 2686 /* 2687 * Queue a state change record. 2688 * If the mode did not change, and there are non-ASM 2689 * listeners or source filters present, 2690 * we potentially need to issue two records for the group. 2691 * If we are transitioning to MCAST_UNDEFINED, we need 2692 * not send any sources. 2693 * If there are ASM listeners, and there was no filter 2694 * mode transition of any kind, do nothing. 2695 */ 2696 if (mode != inm->inm_st[0].iss_fmode) { 2697 if (mode == MCAST_EXCLUDE) { 2698 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2699 __func__); 2700 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2701 } else { 2702 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2703 __func__); 2704 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2705 if (mode == MCAST_UNDEFINED) 2706 record_has_sources = 0; 2707 } 2708 } else { 2709 if (record_has_sources) { 2710 is_filter_list_change = 1; 2711 } else { 2712 type = IGMP_DO_NOTHING; 2713 } 2714 } 2715 } else { 2716 /* 2717 * Queue a current state record. 2718 */ 2719 if (mode == MCAST_EXCLUDE) { 2720 type = IGMP_MODE_IS_EXCLUDE; 2721 } else if (mode == MCAST_INCLUDE) { 2722 type = IGMP_MODE_IS_INCLUDE; 2723 KASSERT(inm->inm_st[1].iss_asm == 0, 2724 ("%s: inm %p is INCLUDE but ASM count is %d", 2725 __func__, inm, inm->inm_st[1].iss_asm)); 2726 } 2727 } 2728 2729 /* 2730 * Generate the filter list changes using a separate function. 2731 */ 2732 if (is_filter_list_change) 2733 return (igmp_v3_enqueue_filter_change(mq, inm)); 2734 2735 if (type == IGMP_DO_NOTHING) { 2736 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2737 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2738 return (0); 2739 } 2740 2741 /* 2742 * If any sources are present, we must be able to fit at least 2743 * one in the trailing space of the tail packet's mbuf, 2744 * ideally more. 2745 */ 2746 minrec0len = sizeof(struct igmp_grouprec); 2747 if (record_has_sources) 2748 minrec0len += sizeof(in_addr_t); 2749 2750 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2751 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2752 inm->inm_ifp->if_xname); 2753 2754 /* 2755 * Check if we have a packet in the tail of the queue for this 2756 * group into which the first group record for this group will fit. 2757 * Otherwise allocate a new packet. 2758 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2759 * Note: Group records for G/GSR query responses MUST be sent 2760 * in their own packet. 2761 */ 2762 m0 = mbufq_last(mq); 2763 if (!is_group_query && 2764 m0 != NULL && 2765 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2766 (m0->m_pkthdr.len + minrec0len) < 2767 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2768 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2769 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2770 m = m0; 2771 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2772 } else { 2773 if (mbufq_full(mq)) { 2774 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2775 return (-ENOMEM); 2776 } 2777 m = NULL; 2778 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2779 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2780 if (!is_state_change && !is_group_query) { 2781 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2782 if (m) 2783 m->m_data += IGMP_LEADINGSPACE; 2784 } 2785 if (m == NULL) { 2786 m = m_gethdr(M_NOWAIT, MT_DATA); 2787 if (m) 2788 M_ALIGN(m, IGMP_LEADINGSPACE); 2789 } 2790 if (m == NULL) 2791 return (-ENOMEM); 2792 2793 igmp_save_context(m, ifp); 2794 2795 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2796 } 2797 2798 /* 2799 * Append group record. 2800 * If we have sources, we don't know how many yet. 2801 */ 2802 ig.ig_type = type; 2803 ig.ig_datalen = 0; 2804 ig.ig_numsrc = 0; 2805 ig.ig_group = inm->inm_addr; 2806 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2807 if (m != m0) 2808 m_freem(m); 2809 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2810 return (-ENOMEM); 2811 } 2812 nbytes += sizeof(struct igmp_grouprec); 2813 2814 /* 2815 * Append as many sources as will fit in the first packet. 2816 * If we are appending to a new packet, the chain allocation 2817 * may potentially use clusters; use m_getptr() in this case. 2818 * If we are appending to an existing packet, we need to obtain 2819 * a pointer to the group record after m_append(), in case a new 2820 * mbuf was allocated. 2821 * Only append sources which are in-mode at t1. If we are 2822 * transitioning to MCAST_UNDEFINED state on the group, do not 2823 * include source entries. 2824 * Only report recorded sources in our filter set when responding 2825 * to a group-source query. 2826 */ 2827 if (record_has_sources) { 2828 if (m == m0) { 2829 md = m_last(m); 2830 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2831 md->m_len - nbytes); 2832 } else { 2833 md = m_getptr(m, 0, &off); 2834 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2835 off); 2836 } 2837 msrcs = 0; 2838 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2839 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2840 ims->ims_haddr); 2841 now = ims_get_mode(inm, ims, 1); 2842 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2843 if ((now != mode) || 2844 (now == mode && mode == MCAST_UNDEFINED)) { 2845 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2846 continue; 2847 } 2848 if (is_source_query && ims->ims_stp == 0) { 2849 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2850 __func__); 2851 continue; 2852 } 2853 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2854 naddr = htonl(ims->ims_haddr); 2855 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2856 if (m != m0) 2857 m_freem(m); 2858 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2859 __func__); 2860 return (-ENOMEM); 2861 } 2862 nbytes += sizeof(in_addr_t); 2863 ++msrcs; 2864 if (msrcs == m0srcs) 2865 break; 2866 } 2867 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2868 msrcs); 2869 pig->ig_numsrc = htons(msrcs); 2870 nbytes += (msrcs * sizeof(in_addr_t)); 2871 } 2872 2873 if (is_source_query && msrcs == 0) { 2874 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2875 if (m != m0) 2876 m_freem(m); 2877 return (0); 2878 } 2879 2880 /* 2881 * We are good to go with first packet. 2882 */ 2883 if (m != m0) { 2884 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2885 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2886 mbufq_enqueue(mq, m); 2887 } else 2888 m->m_pkthdr.PH_vt.vt_nrecs++; 2889 2890 /* 2891 * No further work needed if no source list in packet(s). 2892 */ 2893 if (!record_has_sources) 2894 return (nbytes); 2895 2896 /* 2897 * Whilst sources remain to be announced, we need to allocate 2898 * a new packet and fill out as many sources as will fit. 2899 * Always try for a cluster first. 2900 */ 2901 while (nims != NULL) { 2902 if (mbufq_full(mq)) { 2903 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2904 return (-ENOMEM); 2905 } 2906 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2907 if (m) 2908 m->m_data += IGMP_LEADINGSPACE; 2909 if (m == NULL) { 2910 m = m_gethdr(M_NOWAIT, MT_DATA); 2911 if (m) 2912 M_ALIGN(m, IGMP_LEADINGSPACE); 2913 } 2914 if (m == NULL) 2915 return (-ENOMEM); 2916 igmp_save_context(m, ifp); 2917 md = m_getptr(m, 0, &off); 2918 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2919 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2920 2921 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2922 if (m != m0) 2923 m_freem(m); 2924 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2925 return (-ENOMEM); 2926 } 2927 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2928 nbytes += sizeof(struct igmp_grouprec); 2929 2930 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2931 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2932 2933 msrcs = 0; 2934 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2935 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2936 ims->ims_haddr); 2937 now = ims_get_mode(inm, ims, 1); 2938 if ((now != mode) || 2939 (now == mode && mode == MCAST_UNDEFINED)) { 2940 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2941 continue; 2942 } 2943 if (is_source_query && ims->ims_stp == 0) { 2944 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2945 __func__); 2946 continue; 2947 } 2948 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2949 naddr = htonl(ims->ims_haddr); 2950 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2951 if (m != m0) 2952 m_freem(m); 2953 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2954 __func__); 2955 return (-ENOMEM); 2956 } 2957 ++msrcs; 2958 if (msrcs == m0srcs) 2959 break; 2960 } 2961 pig->ig_numsrc = htons(msrcs); 2962 nbytes += (msrcs * sizeof(in_addr_t)); 2963 2964 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 2965 mbufq_enqueue(mq, m); 2966 } 2967 2968 return (nbytes); 2969} 2970 2971/* 2972 * Type used to mark record pass completion. 2973 * We exploit the fact we can cast to this easily from the 2974 * current filter modes on each ip_msource node. 2975 */ 2976typedef enum { 2977 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 2978 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 2979 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 2980 REC_FULL = REC_ALLOW | REC_BLOCK 2981} rectype_t; 2982 2983/* 2984 * Enqueue an IGMPv3 filter list change to the given output queue. 2985 * 2986 * Source list filter state is held in an RB-tree. When the filter list 2987 * for a group is changed without changing its mode, we need to compute 2988 * the deltas between T0 and T1 for each source in the filter set, 2989 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 2990 * 2991 * As we may potentially queue two record types, and the entire R-B tree 2992 * needs to be walked at once, we break this out into its own function 2993 * so we can generate a tightly packed queue of packets. 2994 * 2995 * XXX This could be written to only use one tree walk, although that makes 2996 * serializing into the mbuf chains a bit harder. For now we do two walks 2997 * which makes things easier on us, and it may or may not be harder on 2998 * the L2 cache. 2999 * 3000 * If successful the size of all data appended to the queue is returned, 3001 * otherwise an error code less than zero is returned, or zero if 3002 * no record(s) were appended. 3003 */ 3004static int 3005igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3006{ 3007 static const int MINRECLEN = 3008 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3009 struct ifnet *ifp; 3010 struct igmp_grouprec ig; 3011 struct igmp_grouprec *pig; 3012 struct ip_msource *ims, *nims; 3013 struct mbuf *m, *m0, *md; 3014 in_addr_t naddr; 3015 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3016 int nallow, nblock; 3017 uint8_t mode, now, then; 3018 rectype_t crt, drt, nrt; 3019 3020 IN_MULTI_LOCK_ASSERT(); 3021 3022 if (inm->inm_nsrc == 0 || 3023 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3024 return (0); 3025 3026 ifp = inm->inm_ifp; /* interface */ 3027 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3028 crt = REC_NONE; /* current group record type */ 3029 drt = REC_NONE; /* mask of completed group record types */ 3030 nrt = REC_NONE; /* record type for current node */ 3031 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3032 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3033 npbytes = 0; /* # of bytes appended this packet */ 3034 rsrcs = 0; /* # sources encoded in current record */ 3035 schanged = 0; /* # nodes encoded in overall filter change */ 3036 nallow = 0; /* # of source entries in ALLOW_NEW */ 3037 nblock = 0; /* # of source entries in BLOCK_OLD */ 3038 nims = NULL; /* next tree node pointer */ 3039 3040 /* 3041 * For each possible filter record mode. 3042 * The first kind of source we encounter tells us which 3043 * is the first kind of record we start appending. 3044 * If a node transitioned to UNDEFINED at t1, its mode is treated 3045 * as the inverse of the group's filter mode. 3046 */ 3047 while (drt != REC_FULL) { 3048 do { 3049 m0 = mbufq_last(mq); 3050 if (m0 != NULL && 3051 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= 3052 IGMP_V3_REPORT_MAXRECS) && 3053 (m0->m_pkthdr.len + MINRECLEN) < 3054 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3055 m = m0; 3056 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3057 sizeof(struct igmp_grouprec)) / 3058 sizeof(in_addr_t); 3059 CTR1(KTR_IGMPV3, 3060 "%s: use previous packet", __func__); 3061 } else { 3062 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3063 if (m) 3064 m->m_data += IGMP_LEADINGSPACE; 3065 if (m == NULL) { 3066 m = m_gethdr(M_NOWAIT, MT_DATA); 3067 if (m) 3068 M_ALIGN(m, IGMP_LEADINGSPACE); 3069 } 3070 if (m == NULL) { 3071 CTR1(KTR_IGMPV3, 3072 "%s: m_get*() failed", __func__); 3073 return (-ENOMEM); 3074 } 3075 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3076 igmp_save_context(m, ifp); 3077 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3078 sizeof(struct igmp_grouprec)) / 3079 sizeof(in_addr_t); 3080 npbytes = 0; 3081 CTR1(KTR_IGMPV3, 3082 "%s: allocated new packet", __func__); 3083 } 3084 /* 3085 * Append the IGMP group record header to the 3086 * current packet's data area. 3087 * Recalculate pointer to free space for next 3088 * group record, in case m_append() allocated 3089 * a new mbuf or cluster. 3090 */ 3091 memset(&ig, 0, sizeof(ig)); 3092 ig.ig_group = inm->inm_addr; 3093 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3094 if (m != m0) 3095 m_freem(m); 3096 CTR1(KTR_IGMPV3, 3097 "%s: m_append() failed", __func__); 3098 return (-ENOMEM); 3099 } 3100 npbytes += sizeof(struct igmp_grouprec); 3101 if (m != m0) { 3102 /* new packet; offset in c hain */ 3103 md = m_getptr(m, npbytes - 3104 sizeof(struct igmp_grouprec), &off); 3105 pig = (struct igmp_grouprec *)(mtod(md, 3106 uint8_t *) + off); 3107 } else { 3108 /* current packet; offset from last append */ 3109 md = m_last(m); 3110 pig = (struct igmp_grouprec *)(mtod(md, 3111 uint8_t *) + md->m_len - 3112 sizeof(struct igmp_grouprec)); 3113 } 3114 /* 3115 * Begin walking the tree for this record type 3116 * pass, or continue from where we left off 3117 * previously if we had to allocate a new packet. 3118 * Only report deltas in-mode at t1. 3119 * We need not report included sources as allowed 3120 * if we are in inclusive mode on the group, 3121 * however the converse is not true. 3122 */ 3123 rsrcs = 0; 3124 if (nims == NULL) 3125 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3126 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3127 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3128 __func__, ims->ims_haddr); 3129 now = ims_get_mode(inm, ims, 1); 3130 then = ims_get_mode(inm, ims, 0); 3131 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3132 __func__, then, now); 3133 if (now == then) { 3134 CTR1(KTR_IGMPV3, 3135 "%s: skip unchanged", __func__); 3136 continue; 3137 } 3138 if (mode == MCAST_EXCLUDE && 3139 now == MCAST_INCLUDE) { 3140 CTR1(KTR_IGMPV3, 3141 "%s: skip IN src on EX group", 3142 __func__); 3143 continue; 3144 } 3145 nrt = (rectype_t)now; 3146 if (nrt == REC_NONE) 3147 nrt = (rectype_t)(~mode & REC_FULL); 3148 if (schanged++ == 0) { 3149 crt = nrt; 3150 } else if (crt != nrt) 3151 continue; 3152 naddr = htonl(ims->ims_haddr); 3153 if (!m_append(m, sizeof(in_addr_t), 3154 (void *)&naddr)) { 3155 if (m != m0) 3156 m_freem(m); 3157 CTR1(KTR_IGMPV3, 3158 "%s: m_append() failed", __func__); 3159 return (-ENOMEM); 3160 } 3161 nallow += !!(crt == REC_ALLOW); 3162 nblock += !!(crt == REC_BLOCK); 3163 if (++rsrcs == m0srcs) 3164 break; 3165 } 3166 /* 3167 * If we did not append any tree nodes on this 3168 * pass, back out of allocations. 3169 */ 3170 if (rsrcs == 0) { 3171 npbytes -= sizeof(struct igmp_grouprec); 3172 if (m != m0) { 3173 CTR1(KTR_IGMPV3, 3174 "%s: m_free(m)", __func__); 3175 m_freem(m); 3176 } else { 3177 CTR1(KTR_IGMPV3, 3178 "%s: m_adj(m, -ig)", __func__); 3179 m_adj(m, -((int)sizeof( 3180 struct igmp_grouprec))); 3181 } 3182 continue; 3183 } 3184 npbytes += (rsrcs * sizeof(in_addr_t)); 3185 if (crt == REC_ALLOW) 3186 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3187 else if (crt == REC_BLOCK) 3188 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3189 pig->ig_numsrc = htons(rsrcs); 3190 /* 3191 * Count the new group record, and enqueue this 3192 * packet if it wasn't already queued. 3193 */ 3194 m->m_pkthdr.PH_vt.vt_nrecs++; 3195 if (m != m0) 3196 mbufq_enqueue(mq, m); 3197 nbytes += npbytes; 3198 } while (nims != NULL); 3199 drt |= crt; 3200 crt = (~crt & REC_FULL); 3201 } 3202 3203 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3204 nallow, nblock); 3205 3206 return (nbytes); 3207} 3208 3209static int 3210igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3211{ 3212 struct mbufq *gq; 3213 struct mbuf *m; /* pending state-change */ 3214 struct mbuf *m0; /* copy of pending state-change */ 3215 struct mbuf *mt; /* last state-change in packet */ 3216 int docopy, domerge; 3217 u_int recslen; 3218 3219 docopy = 0; 3220 domerge = 0; 3221 recslen = 0; 3222 3223 IN_MULTI_LOCK_ASSERT(); 3224 IGMP_LOCK_ASSERT(); 3225 3226 /* 3227 * If there are further pending retransmissions, make a writable 3228 * copy of each queued state-change message before merging. 3229 */ 3230 if (inm->inm_scrv > 0) 3231 docopy = 1; 3232 3233 gq = &inm->inm_scq; 3234#ifdef KTR 3235 if (mbufq_first(gq) == NULL) { 3236 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3237 __func__, inm); 3238 } 3239#endif 3240 3241 m = mbufq_first(gq); 3242 while (m != NULL) { 3243 /* 3244 * Only merge the report into the current packet if 3245 * there is sufficient space to do so; an IGMPv3 report 3246 * packet may only contain 65,535 group records. 3247 * Always use a simple mbuf chain concatentation to do this, 3248 * as large state changes for single groups may have 3249 * allocated clusters. 3250 */ 3251 domerge = 0; 3252 mt = mbufq_last(scq); 3253 if (mt != NULL) { 3254 recslen = m_length(m, NULL); 3255 3256 if ((mt->m_pkthdr.PH_vt.vt_nrecs + 3257 m->m_pkthdr.PH_vt.vt_nrecs <= 3258 IGMP_V3_REPORT_MAXRECS) && 3259 (mt->m_pkthdr.len + recslen <= 3260 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3261 domerge = 1; 3262 } 3263 3264 if (!domerge && mbufq_full(gq)) { 3265 CTR2(KTR_IGMPV3, 3266 "%s: outbound queue full, skipping whole packet %p", 3267 __func__, m); 3268 mt = m->m_nextpkt; 3269 if (!docopy) 3270 m_freem(m); 3271 m = mt; 3272 continue; 3273 } 3274 3275 if (!docopy) { 3276 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3277 m0 = mbufq_dequeue(gq); 3278 m = m0->m_nextpkt; 3279 } else { 3280 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3281 m0 = m_dup(m, M_NOWAIT); 3282 if (m0 == NULL) 3283 return (ENOMEM); 3284 m0->m_nextpkt = NULL; 3285 m = m->m_nextpkt; 3286 } 3287 3288 if (!domerge) { 3289 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3290 __func__, m0, scq); 3291 mbufq_enqueue(scq, m0); 3292 } else { 3293 struct mbuf *mtl; /* last mbuf of packet mt */ 3294 3295 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3296 __func__, m0, mt); 3297 3298 mtl = m_last(mt); 3299 m0->m_flags &= ~M_PKTHDR; 3300 mt->m_pkthdr.len += recslen; 3301 mt->m_pkthdr.PH_vt.vt_nrecs += 3302 m0->m_pkthdr.PH_vt.vt_nrecs; 3303 3304 mtl->m_next = m0; 3305 } 3306 } 3307 3308 return (0); 3309} 3310 3311/* 3312 * Respond to a pending IGMPv3 General Query. 3313 */ 3314static void 3315igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3316{ 3317 struct ifmultiaddr *ifma; 3318 struct ifnet *ifp; 3319 struct in_multi *inm; 3320 int retval, loop; 3321 3322 IN_MULTI_LOCK_ASSERT(); 3323 IGMP_LOCK_ASSERT(); 3324 3325 KASSERT(igi->igi_version == IGMP_VERSION_3, 3326 ("%s: called when version %d", __func__, igi->igi_version)); 3327 3328 /* 3329 * Check that there are some packets queued. If so, send them first. 3330 * For large number of groups the reply to general query can take 3331 * many packets, we should finish sending them before starting of 3332 * queuing the new reply. 3333 */ 3334 if (mbufq_len(&igi->igi_gq) != 0) 3335 goto send; 3336 3337 ifp = igi->igi_ifp; 3338 3339 IF_ADDR_RLOCK(ifp); 3340 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3341 if (ifma->ifma_addr->sa_family != AF_INET || 3342 ifma->ifma_protospec == NULL) 3343 continue; 3344 3345 inm = (struct in_multi *)ifma->ifma_protospec; 3346 KASSERT(ifp == inm->inm_ifp, 3347 ("%s: inconsistent ifp", __func__)); 3348 3349 switch (inm->inm_state) { 3350 case IGMP_NOT_MEMBER: 3351 case IGMP_SILENT_MEMBER: 3352 break; 3353 case IGMP_REPORTING_MEMBER: 3354 case IGMP_IDLE_MEMBER: 3355 case IGMP_LAZY_MEMBER: 3356 case IGMP_SLEEPING_MEMBER: 3357 case IGMP_AWAKENING_MEMBER: 3358 inm->inm_state = IGMP_REPORTING_MEMBER; 3359 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3360 inm, 0, 0, 0); 3361 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3362 __func__, retval); 3363 break; 3364 case IGMP_G_QUERY_PENDING_MEMBER: 3365 case IGMP_SG_QUERY_PENDING_MEMBER: 3366 case IGMP_LEAVING_MEMBER: 3367 break; 3368 } 3369 } 3370 IF_ADDR_RUNLOCK(ifp); 3371 3372send: 3373 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3374 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3375 3376 /* 3377 * Slew transmission of bursts over 500ms intervals. 3378 */ 3379 if (mbufq_first(&igi->igi_gq) != NULL) { 3380 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3381 IGMP_RESPONSE_BURST_INTERVAL); 3382 V_interface_timers_running = 1; 3383 } 3384} 3385 3386/* 3387 * Transmit the next pending IGMP message in the output queue. 3388 * 3389 * We get called from netisr_processqueue(). A mutex private to igmpoq 3390 * will be acquired and released around this routine. 3391 * 3392 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3393 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3394 * a link and uses a link-scope multicast address. 3395 */ 3396static void 3397igmp_intr(struct mbuf *m) 3398{ 3399 struct ip_moptions imo; 3400 struct ifnet *ifp; 3401 struct mbuf *ipopts, *m0; 3402 int error; 3403 uint32_t ifindex; 3404 3405 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3406 3407 /* 3408 * Set VNET image pointer from enqueued mbuf chain 3409 * before doing anything else. Whilst we use interface 3410 * indexes to guard against interface detach, they are 3411 * unique to each VIMAGE and must be retrieved. 3412 */ 3413 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3414 ifindex = igmp_restore_context(m); 3415 3416 /* 3417 * Check if the ifnet still exists. This limits the scope of 3418 * any race in the absence of a global ifp lock for low cost 3419 * (an array lookup). 3420 */ 3421 ifp = ifnet_byindex(ifindex); 3422 if (ifp == NULL) { 3423 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3424 __func__, m, ifindex); 3425 m_freem(m); 3426 IPSTAT_INC(ips_noroute); 3427 goto out; 3428 } 3429 3430 ipopts = V_igmp_sendra ? m_raopt : NULL; 3431 3432 imo.imo_multicast_ttl = 1; 3433 imo.imo_multicast_vif = -1; 3434 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3435 3436 /* 3437 * If the user requested that IGMP traffic be explicitly 3438 * redirected to the loopback interface (e.g. they are running a 3439 * MANET interface and the routing protocol needs to see the 3440 * updates), handle this now. 3441 */ 3442 if (m->m_flags & M_IGMP_LOOP) 3443 imo.imo_multicast_ifp = V_loif; 3444 else 3445 imo.imo_multicast_ifp = ifp; 3446 3447 if (m->m_flags & M_IGMPV2) { 3448 m0 = m; 3449 } else { 3450 m0 = igmp_v3_encap_report(ifp, m); 3451 if (m0 == NULL) { 3452 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3453 m_freem(m); 3454 IPSTAT_INC(ips_odropped); 3455 goto out; 3456 } 3457 } 3458 3459 igmp_scrub_context(m0); 3460 m_clrprotoflags(m); 3461 m0->m_pkthdr.rcvif = V_loif; 3462#ifdef MAC 3463 mac_netinet_igmp_send(ifp, m0); 3464#endif 3465 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3466 if (error) { 3467 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3468 goto out; 3469 } 3470 3471 IGMPSTAT_INC(igps_snd_reports); 3472 3473out: 3474 /* 3475 * We must restore the existing vnet pointer before 3476 * continuing as we are run from netisr context. 3477 */ 3478 CURVNET_RESTORE(); 3479} 3480 3481/* 3482 * Encapsulate an IGMPv3 report. 3483 * 3484 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3485 * chain has already had its IP/IGMPv3 header prepended. In this case 3486 * the function will not attempt to prepend; the lengths and checksums 3487 * will however be re-computed. 3488 * 3489 * Returns a pointer to the new mbuf chain head, or NULL if the 3490 * allocation failed. 3491 */ 3492static struct mbuf * 3493igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3494{ 3495 struct rm_priotracker in_ifa_tracker; 3496 struct igmp_report *igmp; 3497 struct ip *ip; 3498 int hdrlen, igmpreclen; 3499 3500 KASSERT((m->m_flags & M_PKTHDR), 3501 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3502 3503 igmpreclen = m_length(m, NULL); 3504 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3505 3506 if (m->m_flags & M_IGMPV3_HDR) { 3507 igmpreclen -= hdrlen; 3508 } else { 3509 M_PREPEND(m, hdrlen, M_NOWAIT); 3510 if (m == NULL) 3511 return (NULL); 3512 m->m_flags |= M_IGMPV3_HDR; 3513 } 3514 3515 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3516 3517 m->m_data += sizeof(struct ip); 3518 m->m_len -= sizeof(struct ip); 3519 3520 igmp = mtod(m, struct igmp_report *); 3521 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3522 igmp->ir_rsv1 = 0; 3523 igmp->ir_rsv2 = 0; 3524 igmp->ir_numgrps = htons(m->m_pkthdr.PH_vt.vt_nrecs); 3525 igmp->ir_cksum = 0; 3526 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3527 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3528 3529 m->m_data -= sizeof(struct ip); 3530 m->m_len += sizeof(struct ip); 3531 3532 ip = mtod(m, struct ip *); 3533 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3534 ip->ip_len = htons(hdrlen + igmpreclen); 3535 ip->ip_off = htons(IP_DF); 3536 ip->ip_p = IPPROTO_IGMP; 3537 ip->ip_sum = 0; 3538 3539 ip->ip_src.s_addr = INADDR_ANY; 3540 3541 if (m->m_flags & M_IGMP_LOOP) { 3542 struct in_ifaddr *ia; 3543 3544 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 3545 if (ia != NULL) { 3546 ip->ip_src = ia->ia_addr.sin_addr; 3547 ifa_free(&ia->ia_ifa); 3548 } 3549 } 3550 3551 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3552 3553 return (m); 3554} 3555 3556#ifdef KTR 3557static char * 3558igmp_rec_type_to_str(const int type) 3559{ 3560 3561 switch (type) { 3562 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3563 return "TO_EX"; 3564 break; 3565 case IGMP_CHANGE_TO_INCLUDE_MODE: 3566 return "TO_IN"; 3567 break; 3568 case IGMP_MODE_IS_EXCLUDE: 3569 return "MODE_EX"; 3570 break; 3571 case IGMP_MODE_IS_INCLUDE: 3572 return "MODE_IN"; 3573 break; 3574 case IGMP_ALLOW_NEW_SOURCES: 3575 return "ALLOW_NEW"; 3576 break; 3577 case IGMP_BLOCK_OLD_SOURCES: 3578 return "BLOCK_OLD"; 3579 break; 3580 default: 3581 break; 3582 } 3583 return "unknown"; 3584} 3585#endif 3586 3587#ifdef VIMAGE 3588static void 3589vnet_igmp_init(const void *unused __unused) 3590{ 3591 3592 netisr_register_vnet(&igmp_nh); 3593} 3594VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3595 vnet_igmp_init, NULL); 3596 3597static void 3598vnet_igmp_uninit(const void *unused __unused) 3599{ 3600 3601 /* This can happen when we shutdown the entire network stack. */ 3602 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3603 3604 netisr_unregister_vnet(&igmp_nh); 3605} 3606VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3607 vnet_igmp_uninit, NULL); 3608#endif 3609 3610#ifdef DDB 3611DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3612{ 3613 struct igmp_ifsoftc *igi, *tigi; 3614 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3615 3616 if (!have_addr) { 3617 db_printf("usage: show igi_list <addr>\n"); 3618 return; 3619 } 3620 igi_head = (struct _igi_list *)addr; 3621 3622 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3623 db_printf("igmp_ifsoftc %p:\n", igi); 3624 db_printf(" ifp %p\n", igi->igi_ifp); 3625 db_printf(" version %u\n", igi->igi_version); 3626 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3627 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3628 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3629 db_printf(" flags %#x\n", igi->igi_flags); 3630 db_printf(" rv %u\n", igi->igi_rv); 3631 db_printf(" qi %u\n", igi->igi_qi); 3632 db_printf(" qri %u\n", igi->igi_qri); 3633 db_printf(" uri %u\n", igi->igi_uri); 3634 /* SLIST_HEAD(,in_multi) igi_relinmhead */ 3635 /* struct mbufq igi_gq; */ 3636 db_printf("\n"); 3637 } 3638} 3639#endif 3640 3641static int 3642igmp_modevent(module_t mod, int type, void *unused __unused) 3643{ 3644 3645 switch (type) { 3646 case MOD_LOAD: 3647 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3648 IGMP_LOCK_INIT(); 3649 m_raopt = igmp_ra_alloc(); 3650 netisr_register(&igmp_nh); 3651 break; 3652 case MOD_UNLOAD: 3653 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3654 netisr_unregister(&igmp_nh); 3655 m_free(m_raopt); 3656 m_raopt = NULL; 3657 IGMP_LOCK_DESTROY(); 3658 break; 3659 default: 3660 return (EOPNOTSUPP); 3661 } 3662 return (0); 3663} 3664 3665static moduledata_t igmp_mod = { 3666 "igmp", 3667 igmp_modevent, 3668 0 3669}; 3670DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3671