/* * Copyright (c) 2000-2013 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /*- * Copyright (c) 2007-2009 Bruce Simpson. * Copyright (c) 1988 Stephen Deering. * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Stephen Deering of Stanford University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)igmp.c 8.1 (Berkeley) 7/19/93 */ /* * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce * support for mandatory and extensible security protections. This notice * is included in support of clause 2.2 (b) of the Apple Public License, * Version 2.0. */ /* * Internet Group Management Protocol (IGMP) routines. * [RFC1112, RFC2236, RFC3376] * * Written by Steve Deering, Stanford, May 1988. * Modified by Rosen Sharma, Stanford, Aug 1994. * Modified by Bill Fenner, Xerox PARC, Feb 1995. * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995. * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson. * * MULTICAST Revision: 3.5.1.4 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include SLIST_HEAD(igmp_inm_relhead, in_multi); static void igi_initvar(struct igmp_ifinfo *, struct ifnet *, int); static struct igmp_ifinfo *igi_alloc(int); static void igi_free(struct igmp_ifinfo *); static void igi_delete(const struct ifnet *, struct igmp_inm_relhead *); static void igmp_dispatch_queue(struct igmp_ifinfo *, struct ifqueue *, int, const int); static void igmp_final_leave(struct in_multi *, struct igmp_ifinfo *, struct igmp_tparams *); static int igmp_handle_state_change(struct in_multi *, struct igmp_ifinfo *, struct igmp_tparams *); static int igmp_initial_join(struct in_multi *, struct igmp_ifinfo *, struct igmp_tparams *); static int igmp_input_v1_query(struct ifnet *, const struct ip *, const struct igmp *); static int igmp_input_v2_query(struct ifnet *, const struct ip *, const struct igmp *); static int igmp_input_v3_query(struct ifnet *, const struct ip *, /*const*/ struct igmpv3 *); static int igmp_input_v3_group_query(struct in_multi *, int, /*const*/ struct igmpv3 *); static int igmp_input_v1_report(struct ifnet *, struct mbuf *, /*const*/ struct ip *, /*const*/ struct igmp *); static int igmp_input_v2_report(struct ifnet *, struct mbuf *, /*const*/ struct ip *, /*const*/ struct igmp *); static void igmp_sendpkt(struct mbuf *); static __inline__ int igmp_isgroupreported(const struct in_addr); static struct mbuf *igmp_ra_alloc(void); #ifdef IGMP_DEBUG static const char *igmp_rec_type_to_str(const int); #endif static uint32_t igmp_set_version(struct igmp_ifinfo *, const int); static void igmp_flush_relq(struct igmp_ifinfo *, struct igmp_inm_relhead *); static int igmp_v1v2_queue_report(struct in_multi *, const int); static void igmp_v1v2_process_group_timer(struct in_multi *, const int); static void igmp_v1v2_process_querier_timers(struct igmp_ifinfo *); static uint32_t igmp_v2_update_group(struct in_multi *, const int); static void igmp_v3_cancel_link_timers(struct igmp_ifinfo *); static uint32_t igmp_v3_dispatch_general_query(struct igmp_ifinfo *); static struct mbuf * igmp_v3_encap_report(struct ifnet *, struct mbuf *); static int igmp_v3_enqueue_group_record(struct ifqueue *, struct in_multi *, const int, const int, const int); static int igmp_v3_enqueue_filter_change(struct ifqueue *, struct in_multi *); static void igmp_v3_process_group_timers(struct igmp_ifinfo *, struct ifqueue *, struct ifqueue *, struct in_multi *, const int); static int igmp_v3_merge_state_changes(struct in_multi *, struct ifqueue *); static void igmp_v3_suppress_group_record(struct in_multi *); static int sysctl_igmp_ifinfo SYSCTL_HANDLER_ARGS; static int sysctl_igmp_gsr SYSCTL_HANDLER_ARGS; static int sysctl_igmp_default_version SYSCTL_HANDLER_ARGS; static int igmp_timeout_run; /* IGMP timer is scheduled to run */ static void igmp_timeout(void *); static void igmp_sched_timeout(void); static struct mbuf *m_raopt; /* Router Alert option */ static int querier_present_timers_running; /* IGMPv1/v2 older version * querier present */ static int interface_timers_running; /* IGMPv3 general * query response */ static int state_change_timers_running; /* IGMPv3 state-change * retransmit */ static int current_state_timers_running; /* IGMPv1/v2 host * report; IGMPv3 g/sg * query response */ /* * Subsystem lock macros. */ #define IGMP_LOCK() \ lck_mtx_lock(&igmp_mtx) #define IGMP_LOCK_ASSERT_HELD() \ lck_mtx_assert(&igmp_mtx, LCK_MTX_ASSERT_OWNED) #define IGMP_LOCK_ASSERT_NOTHELD() \ lck_mtx_assert(&igmp_mtx, LCK_MTX_ASSERT_NOTOWNED) #define IGMP_UNLOCK() \ lck_mtx_unlock(&igmp_mtx) static LIST_HEAD(, igmp_ifinfo) igi_head; static struct igmpstat_v3 igmpstat_v3 = { .igps_version = IGPS_VERSION_3, .igps_len = sizeof(struct igmpstat_v3), }; static struct igmpstat igmpstat; /* old IGMPv2 stats structure */ static struct timeval igmp_gsrdelay = {10, 0}; static int igmp_recvifkludge = 1; static int igmp_sendra = 1; static int igmp_sendlocal = 1; static int igmp_v1enable = 1; static int igmp_v2enable = 1; static int igmp_legacysupp = 0; static int igmp_default_version = IGMP_VERSION_3; SYSCTL_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_RD | CTLFLAG_LOCKED, &igmpstat, igmpstat, ""); SYSCTL_STRUCT(_net_inet_igmp, OID_AUTO, v3stats, CTLFLAG_RD | CTLFLAG_LOCKED, &igmpstat_v3, igmpstat_v3, ""); SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_recvifkludge, 0, "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_sendra, 0, "Send IP Router Alert option in IGMPv2/v3 messages"); SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_sendlocal, 0, "Send IGMP membership reports for 224.0.0.0/24 groups"); SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_v1enable, 0, "Enable backwards compatibility with IGMPv1"); SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_v2enable, 0, "Enable backwards compatibility with IGMPv2"); SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_legacysupp, 0, "Allow v1/v2 reports to suppress v3 group responses"); SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, CTLTYPE_INT | CTLFLAG_RW, &igmp_default_version, 0, sysctl_igmp_default_version, "I", "Default version of IGMP to run on each interface"); SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, CTLTYPE_INT | CTLFLAG_RW, &igmp_gsrdelay.tv_sec, 0, sysctl_igmp_gsr, "I", "Rate limit for IGMPv3 Group-and-Source queries in seconds"); #ifdef IGMP_DEBUG int igmp_debug = 0; SYSCTL_INT(_net_inet_igmp, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_debug, 0, ""); #endif SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, CTLFLAG_RD | CTLFLAG_LOCKED, sysctl_igmp_ifinfo, "Per-interface IGMPv3 state"); /* Lock group and attribute for igmp_mtx */ static lck_attr_t *igmp_mtx_attr; static lck_grp_t *igmp_mtx_grp; static lck_grp_attr_t *igmp_mtx_grp_attr; /* * Locking and reference counting: * * igmp_mtx mainly protects igi_head. In cases where both igmp_mtx and * in_multihead_lock must be held, the former must be acquired first in order * to maintain lock ordering. It is not a requirement that igmp_mtx be * acquired first before in_multihead_lock, but in case both must be acquired * in succession, the correct lock ordering must be followed. * * Instead of walking the if_multiaddrs list at the interface and returning * the ifma_protospec value of a matching entry, we search the global list * of in_multi records and find it that way; this is done with in_multihead * lock held. Doing so avoids the race condition issues that many other BSDs * suffer from (therefore in our implementation, ifma_protospec will never be * NULL for as long as the in_multi is valid.) * * The above creates a requirement for the in_multi to stay in in_multihead * list even after the final IGMP leave (in IGMPv3 mode) until no longer needs * be retransmitted (this is not required for IGMPv1/v2.) In order to handle * this, the request and reference counts of the in_multi are bumped up when * the state changes to IGMP_LEAVING_MEMBER, and later dropped in the timeout * handler. Each in_multi holds a reference to the underlying igmp_ifinfo. * * Thus, the permitted lock oder is: * * igmp_mtx, in_multihead_lock, inm_lock, igi_lock * * Any may be taken independently, but if any are held at the same time, * the above lock order must be followed. */ static decl_lck_mtx_data(, igmp_mtx); static int igmp_timers_are_running; #define IGMP_ADD_DETACHED_INM(_head, _inm) { \ SLIST_INSERT_HEAD(_head, _inm, inm_dtle); \ } #define IGMP_REMOVE_DETACHED_INM(_head) { \ struct in_multi *_inm, *_inm_tmp; \ SLIST_FOREACH_SAFE(_inm, _head, inm_dtle, _inm_tmp) { \ SLIST_REMOVE(_head, _inm, in_multi, inm_dtle); \ INM_REMREF(_inm); \ } \ VERIFY(SLIST_EMPTY(_head)); \ } #define IGI_ZONE_MAX 64 /* maximum elements in zone */ #define IGI_ZONE_NAME "igmp_ifinfo" /* zone name */ static unsigned int igi_size; /* size of zone element */ static struct zone *igi_zone; /* zone for igmp_ifinfo */ /* Store IGMPv3 record count in the module private scratch space */ #define vt_nrecs pkt_mpriv.__mpriv_u.__mpriv32[0].__mpriv32_u.__val16[0] static __inline void igmp_save_context(struct mbuf *m, struct ifnet *ifp) { m->m_pkthdr.rcvif = ifp; } static __inline void igmp_scrub_context(struct mbuf *m) { m->m_pkthdr.rcvif = NULL; } #ifdef IGMP_DEBUG static __inline const char * inet_ntop_haddr(in_addr_t haddr, char *buf, socklen_t size) { struct in_addr ia; ia.s_addr = htonl(haddr); return (inet_ntop(AF_INET, &ia, buf, size)); } #endif /* * Restore context from a queued IGMP output chain. * Return saved ifp. */ static __inline struct ifnet * igmp_restore_context(struct mbuf *m) { return (m->m_pkthdr.rcvif); } /* * Retrieve or set default IGMP version. */ static int sysctl_igmp_default_version SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg2) int error; int new; IGMP_LOCK(); error = SYSCTL_OUT(req, arg1, sizeof(int)); if (error || !req->newptr) goto out_locked; new = igmp_default_version; error = SYSCTL_IN(req, &new, sizeof(int)); if (error) goto out_locked; if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { error = EINVAL; goto out_locked; } IGMP_PRINTF(("%s: change igmp_default_version from %d to %d\n", __func__, igmp_default_version, new)); igmp_default_version = new; out_locked: IGMP_UNLOCK(); return (error); } /* * Retrieve or set threshold between group-source queries in seconds. * */ static int sysctl_igmp_gsr SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error; int i; IGMP_LOCK(); i = igmp_gsrdelay.tv_sec; error = sysctl_handle_int(oidp, &i, 0, req); if (error || !req->newptr) goto out_locked; if (i < -1 || i >= 60) { error = EINVAL; goto out_locked; } igmp_gsrdelay.tv_sec = i; out_locked: IGMP_UNLOCK(); return (error); } /* * Expose struct igmp_ifinfo to userland, keyed by ifindex. * For use by ifmcstat(8). * */ static int sysctl_igmp_ifinfo SYSCTL_HANDLER_ARGS { #pragma unused(oidp) int *name; int error; u_int namelen; struct ifnet *ifp; struct igmp_ifinfo *igi; struct igmp_ifinfo_u igi_u; name = (int *)arg1; namelen = arg2; if (req->newptr != USER_ADDR_NULL) return (EPERM); if (namelen != 1) return (EINVAL); IGMP_LOCK(); if (name[0] <= 0 || name[0] > (u_int)if_index) { error = ENOENT; goto out_locked; } error = ENOENT; ifnet_head_lock_shared(); ifp = ifindex2ifnet[name[0]]; ifnet_head_done(); if (ifp == NULL) goto out_locked; bzero(&igi_u, sizeof (igi_u)); LIST_FOREACH(igi, &igi_head, igi_link) { IGI_LOCK(igi); if (ifp != igi->igi_ifp) { IGI_UNLOCK(igi); continue; } igi_u.igi_ifindex = igi->igi_ifp->if_index; igi_u.igi_version = igi->igi_version; igi_u.igi_v1_timer = igi->igi_v1_timer; igi_u.igi_v2_timer = igi->igi_v2_timer; igi_u.igi_v3_timer = igi->igi_v3_timer; igi_u.igi_flags = igi->igi_flags; igi_u.igi_rv = igi->igi_rv; igi_u.igi_qi = igi->igi_qi; igi_u.igi_qri = igi->igi_qri; igi_u.igi_uri = igi->igi_uri; IGI_UNLOCK(igi); error = SYSCTL_OUT(req, &igi_u, sizeof (igi_u)); break; } out_locked: IGMP_UNLOCK(); return (error); } /* * Dispatch an entire queue of pending packet chains * * Must not be called with inm_lock held. */ static void igmp_dispatch_queue(struct igmp_ifinfo *igi, struct ifqueue *ifq, int limit, const int loop) { struct mbuf *m; struct ip *ip; if (igi != NULL) IGI_LOCK_ASSERT_HELD(igi); for (;;) { IF_DEQUEUE(ifq, m); if (m == NULL) break; IGMP_PRINTF(("%s: dispatch 0x%llx from 0x%llx\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifq), (uint64_t)VM_KERNEL_ADDRPERM(m))); ip = mtod(m, struct ip *); if (loop) m->m_flags |= M_IGMP_LOOP; if (igi != NULL) IGI_UNLOCK(igi); igmp_sendpkt(m); if (igi != NULL) IGI_LOCK(igi); if (--limit == 0) break; } if (igi != NULL) IGI_LOCK_ASSERT_HELD(igi); } /* * Filter outgoing IGMP report state by group. * * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are * disabled for all groups in the 224.0.0.0/24 link-local scope. However, * this may break certain IGMP snooping switches which rely on the old * report behaviour. * * Return zero if the given group is one for which IGMP reports * should be suppressed, or non-zero if reports should be issued. */ static __inline__ int igmp_isgroupreported(const struct in_addr addr) { if (in_allhosts(addr) || ((!igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) return (0); return (1); } /* * Construct a Router Alert option to use in outgoing packets. */ static struct mbuf * igmp_ra_alloc(void) { struct mbuf *m; struct ipoption *p; MGET(m, M_WAITOK, MT_DATA); p = mtod(m, struct ipoption *); p->ipopt_dst.s_addr = INADDR_ANY; p->ipopt_list[0] = IPOPT_RA; /* Router Alert Option */ p->ipopt_list[1] = 0x04; /* 4 bytes long */ p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ p->ipopt_list[3] = 0x00; /* pad byte */ m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; return (m); } /* * Attach IGMP when PF_INET is attached to an interface. */ struct igmp_ifinfo * igmp_domifattach(struct ifnet *ifp, int how) { struct igmp_ifinfo *igi; IGMP_PRINTF(("%s: called for ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name)); igi = igi_alloc(how); if (igi == NULL) return (NULL); IGMP_LOCK(); IGI_LOCK(igi); igi_initvar(igi, ifp, 0); igi->igi_debug |= IFD_ATTACHED; IGI_ADDREF_LOCKED(igi); /* hold a reference for igi_head */ IGI_ADDREF_LOCKED(igi); /* hold a reference for caller */ IGI_UNLOCK(igi); ifnet_lock_shared(ifp); igmp_initsilent(ifp, igi); ifnet_lock_done(ifp); LIST_INSERT_HEAD(&igi_head, igi, igi_link); IGMP_UNLOCK(); IGMP_PRINTF(("%s: allocate igmp_ifinfo for ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name)); return (igi); } /* * Attach IGMP when PF_INET is reattached to an interface. Caller is * expected to have an outstanding reference to the igi. */ void igmp_domifreattach(struct igmp_ifinfo *igi) { struct ifnet *ifp; IGMP_LOCK(); IGI_LOCK(igi); VERIFY(!(igi->igi_debug & IFD_ATTACHED)); ifp = igi->igi_ifp; VERIFY(ifp != NULL); igi_initvar(igi, ifp, 1); igi->igi_debug |= IFD_ATTACHED; IGI_ADDREF_LOCKED(igi); /* hold a reference for igi_head */ IGI_UNLOCK(igi); ifnet_lock_shared(ifp); igmp_initsilent(ifp, igi); ifnet_lock_done(ifp); LIST_INSERT_HEAD(&igi_head, igi, igi_link); IGMP_UNLOCK(); IGMP_PRINTF(("%s: reattached igmp_ifinfo for ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name)); } /* * Hook for domifdetach. */ void igmp_domifdetach(struct ifnet *ifp) { SLIST_HEAD(, in_multi) inm_dthead; SLIST_INIT(&inm_dthead); IGMP_PRINTF(("%s: called for ifp 0x%llx(%s%d)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name, ifp->if_unit)); IGMP_LOCK(); igi_delete(ifp, (struct igmp_inm_relhead *)&inm_dthead); IGMP_UNLOCK(); /* Now that we're dropped all locks, release detached records */ IGMP_REMOVE_DETACHED_INM(&inm_dthead); } /* * Called at interface detach time. Note that we only flush all deferred * responses and record releases; all remaining inm records and their source * entries related to this interface are left intact, in order to handle * the reattach case. */ static void igi_delete(const struct ifnet *ifp, struct igmp_inm_relhead *inm_dthead) { struct igmp_ifinfo *igi, *tigi; IGMP_LOCK_ASSERT_HELD(); LIST_FOREACH_SAFE(igi, &igi_head, igi_link, tigi) { IGI_LOCK(igi); if (igi->igi_ifp == ifp) { /* * Free deferred General Query responses. */ IF_DRAIN(&igi->igi_gq); IF_DRAIN(&igi->igi_v2q); igmp_flush_relq(igi, inm_dthead); VERIFY(SLIST_EMPTY(&igi->igi_relinmhead)); igi->igi_debug &= ~IFD_ATTACHED; IGI_UNLOCK(igi); LIST_REMOVE(igi, igi_link); IGI_REMREF(igi); /* release igi_head reference */ return; } IGI_UNLOCK(igi); } panic("%s: igmp_ifinfo not found for ifp %p(%s)\n", __func__, ifp, ifp->if_xname); } __private_extern__ void igmp_initsilent(struct ifnet *ifp, struct igmp_ifinfo *igi) { ifnet_lock_assert(ifp, IFNET_LCK_ASSERT_OWNED); IGI_LOCK_ASSERT_NOTHELD(igi); IGI_LOCK(igi); if (!(ifp->if_flags & IFF_MULTICAST)) igi->igi_flags |= IGIF_SILENT; else igi->igi_flags &= ~IGIF_SILENT; IGI_UNLOCK(igi); } static void igi_initvar(struct igmp_ifinfo *igi, struct ifnet *ifp, int reattach) { IGI_LOCK_ASSERT_HELD(igi); igi->igi_ifp = ifp; igi->igi_version = igmp_default_version; igi->igi_flags = 0; igi->igi_rv = IGMP_RV_INIT; igi->igi_qi = IGMP_QI_INIT; igi->igi_qri = IGMP_QRI_INIT; igi->igi_uri = IGMP_URI_INIT; if (!reattach) SLIST_INIT(&igi->igi_relinmhead); /* * Responses to general queries are subject to bounds. */ igi->igi_gq.ifq_maxlen = IGMP_MAX_RESPONSE_PACKETS; igi->igi_v2q.ifq_maxlen = IGMP_MAX_RESPONSE_PACKETS; } static struct igmp_ifinfo * igi_alloc(int how) { struct igmp_ifinfo *igi; igi = (how == M_WAITOK) ? zalloc(igi_zone) : zalloc_noblock(igi_zone); if (igi != NULL) { bzero(igi, igi_size); lck_mtx_init(&igi->igi_lock, igmp_mtx_grp, igmp_mtx_attr); igi->igi_debug |= IFD_ALLOC; } return (igi); } static void igi_free(struct igmp_ifinfo *igi) { IGI_LOCK(igi); if (igi->igi_debug & IFD_ATTACHED) { panic("%s: attached igi=%p is being freed", __func__, igi); /* NOTREACHED */ } else if (igi->igi_ifp != NULL) { panic("%s: ifp not NULL for igi=%p", __func__, igi); /* NOTREACHED */ } else if (!(igi->igi_debug & IFD_ALLOC)) { panic("%s: igi %p cannot be freed", __func__, igi); /* NOTREACHED */ } else if (igi->igi_refcnt != 0) { panic("%s: non-zero refcnt igi=%p", __func__, igi); /* NOTREACHED */ } igi->igi_debug &= ~IFD_ALLOC; IGI_UNLOCK(igi); lck_mtx_destroy(&igi->igi_lock, igmp_mtx_grp); zfree(igi_zone, igi); } void igi_addref(struct igmp_ifinfo *igi, int locked) { if (!locked) IGI_LOCK_SPIN(igi); else IGI_LOCK_ASSERT_HELD(igi); if (++igi->igi_refcnt == 0) { panic("%s: igi=%p wraparound refcnt", __func__, igi); /* NOTREACHED */ } if (!locked) IGI_UNLOCK(igi); } void igi_remref(struct igmp_ifinfo *igi) { SLIST_HEAD(, in_multi) inm_dthead; struct ifnet *ifp; IGI_LOCK_SPIN(igi); if (igi->igi_refcnt == 0) { panic("%s: igi=%p negative refcnt", __func__, igi); /* NOTREACHED */ } --igi->igi_refcnt; if (igi->igi_refcnt > 0) { IGI_UNLOCK(igi); return; } ifp = igi->igi_ifp; igi->igi_ifp = NULL; IF_DRAIN(&igi->igi_gq); IF_DRAIN(&igi->igi_v2q); SLIST_INIT(&inm_dthead); igmp_flush_relq(igi, (struct igmp_inm_relhead *)&inm_dthead); VERIFY(SLIST_EMPTY(&igi->igi_relinmhead)); IGI_UNLOCK(igi); /* Now that we're dropped all locks, release detached records */ IGMP_REMOVE_DETACHED_INM(&inm_dthead); IGMP_PRINTF(("%s: freeing igmp_ifinfo for ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); igi_free(igi); } /* * Process a received IGMPv1 query. * Return non-zero if the message should be dropped. */ static int igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, const struct igmp *igmp) { struct igmp_ifinfo *igi; struct in_multi *inm; struct in_multistep step; struct igmp_tparams itp = { 0, 0, 0, 0 }; IGMP_LOCK_ASSERT_NOTHELD(); /* * IGMPv1 Host Membership Queries SHOULD always be addressed to * 224.0.0.1. They are always treated as General Queries. * igmp_group is always ignored. Do not drop it as a userland * daemon may wish to see it. */ if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { IGMPSTAT_INC(igps_rcv_badqueries); OIGMPSTAT_INC(igps_rcv_badqueries); goto done; } IGMPSTAT_INC(igps_rcv_gen_queries); igi = IGMP_IFINFO(ifp); VERIFY(igi != NULL); IGI_LOCK(igi); if (igi->igi_flags & IGIF_LOOPBACK) { IGMP_PRINTF(("%s: ignore v1 query on IGIF_LOOPBACK " "ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); IGI_UNLOCK(igi); goto done; } /* * Switch to IGMPv1 host compatibility mode. */ itp.qpt = igmp_set_version(igi, IGMP_VERSION_1); IGI_UNLOCK(igi); IGMP_PRINTF(("%s: process v1 query on ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); /* * Start the timers in all of our group records * for the interface on which the query arrived, * except those which are already running. */ in_multihead_lock_shared(); IN_FIRST_MULTI(step, inm); while (inm != NULL) { INM_LOCK(inm); if (inm->inm_ifp != ifp || inm->inm_timer != 0) goto next; switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: break; case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: case IGMP_REPORTING_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_SLEEPING_MEMBER: case IGMP_AWAKENING_MEMBER: inm->inm_state = IGMP_REPORTING_MEMBER; inm->inm_timer = IGMP_RANDOM_DELAY(IGMP_V1V2_MAX_RI); itp.cst = 1; break; case IGMP_LEAVING_MEMBER: break; } next: INM_UNLOCK(inm); IN_NEXT_MULTI(step, inm); } in_multihead_lock_done(); done: igmp_set_timeout(&itp); return (0); } /* * Process a received IGMPv2 general or group-specific query. */ static int igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, const struct igmp *igmp) { struct igmp_ifinfo *igi; struct in_multi *inm; int is_general_query; uint16_t timer; struct igmp_tparams itp = { 0, 0, 0, 0 }; IGMP_LOCK_ASSERT_NOTHELD(); is_general_query = 0; /* * Validate address fields upfront. */ if (in_nullhost(igmp->igmp_group)) { /* * IGMPv2 General Query. * If this was not sent to the all-hosts group, ignore it. */ if (!in_allhosts(ip->ip_dst)) goto done; IGMPSTAT_INC(igps_rcv_gen_queries); is_general_query = 1; } else { /* IGMPv2 Group-Specific Query. */ IGMPSTAT_INC(igps_rcv_group_queries); } igi = IGMP_IFINFO(ifp); VERIFY(igi != NULL); IGI_LOCK(igi); if (igi->igi_flags & IGIF_LOOPBACK) { IGMP_PRINTF(("%s: ignore v2 query on IGIF_LOOPBACK " "ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); IGI_UNLOCK(igi); goto done; } /* * Ignore v2 query if in v1 Compatibility Mode. */ if (igi->igi_version == IGMP_VERSION_1) { IGI_UNLOCK(igi); goto done; } itp.qpt = igmp_set_version(igi, IGMP_VERSION_2); IGI_UNLOCK(igi); timer = igmp->igmp_code / IGMP_TIMER_SCALE; if (timer == 0) timer = 1; if (is_general_query) { struct in_multistep step; IGMP_PRINTF(("%s: process v2 general query on ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); /* * For each reporting group joined on this * interface, kick the report timer. */ in_multihead_lock_shared(); IN_FIRST_MULTI(step, inm); while (inm != NULL) { INM_LOCK(inm); if (inm->inm_ifp == ifp) itp.cst += igmp_v2_update_group(inm, timer); INM_UNLOCK(inm); IN_NEXT_MULTI(step, inm); } in_multihead_lock_done(); } else { /* * Group-specific IGMPv2 query, we need only * look up the single group to process it. */ in_multihead_lock_shared(); IN_LOOKUP_MULTI(&igmp->igmp_group, ifp, inm); in_multihead_lock_done(); if (inm != NULL) { INM_LOCK(inm); IGMP_INET_PRINTF(igmp->igmp_group, ("process v2 query %s on ifp 0x%llx(%s)\n", _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); itp.cst = igmp_v2_update_group(inm, timer); INM_UNLOCK(inm); INM_REMREF(inm); /* from IN_LOOKUP_MULTI */ } } done: igmp_set_timeout(&itp); return (0); } /* * Update the report timer on a group in response to an IGMPv2 query. * * If we are becoming the reporting member for this group, start the timer. * If we already are the reporting member for this group, and timer is * below the threshold, reset it. * * We may be updating the group for the first time since we switched * to IGMPv3. If we are, then we must clear any recorded source lists, * and transition to REPORTING state; the group timer is overloaded * for group and group-source query responses. * * Unlike IGMPv3, the delay per group should be jittered * to avoid bursts of IGMPv2 reports. */ static uint32_t igmp_v2_update_group(struct in_multi *inm, const int timer) { IGMP_INET_PRINTF(inm->inm_addr, ("%s: %s/%s timer=%d\n", __func__, _igmp_inet_buf, if_name(inm->inm_ifp), timer)); INM_LOCK_ASSERT_HELD(inm); switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: break; case IGMP_REPORTING_MEMBER: if (inm->inm_timer != 0 && inm->inm_timer <= timer) { IGMP_PRINTF(("%s: REPORTING and timer running, " "skipping.\n", __func__)); break; } /* FALLTHROUGH */ case IGMP_SG_QUERY_PENDING_MEMBER: case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_AWAKENING_MEMBER: IGMP_PRINTF(("%s: ->REPORTING\n", __func__)); inm->inm_state = IGMP_REPORTING_MEMBER; inm->inm_timer = IGMP_RANDOM_DELAY(timer); break; case IGMP_SLEEPING_MEMBER: IGMP_PRINTF(("%s: ->AWAKENING\n", __func__)); inm->inm_state = IGMP_AWAKENING_MEMBER; break; case IGMP_LEAVING_MEMBER: break; } return (inm->inm_timer); } /* * Process a received IGMPv3 general, group-specific or * group-and-source-specific query. * Assumes m has already been pulled up to the full IGMP message length. * Return 0 if successful, otherwise an appropriate error code is returned. */ static int igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, /*const*/ struct igmpv3 *igmpv3) { struct igmp_ifinfo *igi; struct in_multi *inm; int is_general_query; uint32_t maxresp, nsrc, qqi; uint16_t timer; uint8_t qrv; struct igmp_tparams itp = { 0, 0, 0, 0 }; IGMP_LOCK_ASSERT_NOTHELD(); is_general_query = 0; IGMP_PRINTF(("%s: process v3 query on ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ if (maxresp >= 128) { maxresp = IGMP_MANT(igmpv3->igmp_code) << (IGMP_EXP(igmpv3->igmp_code) + 3); } /* * Robustness must never be less than 2 for on-wire IGMPv3. * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make * an exception for interfaces whose IGMPv3 state changes * are redirected to loopback (e.g. MANET). */ qrv = IGMP_QRV(igmpv3->igmp_misc); if (qrv < 2) { IGMP_PRINTF(("%s: clamping qrv %d to %d\n", __func__, qrv, IGMP_RV_INIT)); qrv = IGMP_RV_INIT; } qqi = igmpv3->igmp_qqi; if (qqi >= 128) { qqi = IGMP_MANT(igmpv3->igmp_qqi) << (IGMP_EXP(igmpv3->igmp_qqi) + 3); } timer = maxresp / IGMP_TIMER_SCALE; if (timer == 0) timer = 1; nsrc = ntohs(igmpv3->igmp_numsrc); /* * Validate address fields and versions upfront before * accepting v3 query. */ if (in_nullhost(igmpv3->igmp_group)) { /* * IGMPv3 General Query. * * General Queries SHOULD be directed to 224.0.0.1. * A general query with a source list has undefined * behaviour; discard it. */ IGMPSTAT_INC(igps_rcv_gen_queries); if (!in_allhosts(ip->ip_dst) || nsrc > 0) { IGMPSTAT_INC(igps_rcv_badqueries); OIGMPSTAT_INC(igps_rcv_badqueries); goto done; } is_general_query = 1; } else { /* Group or group-source specific query. */ if (nsrc == 0) IGMPSTAT_INC(igps_rcv_group_queries); else IGMPSTAT_INC(igps_rcv_gsr_queries); } igi = IGMP_IFINFO(ifp); VERIFY(igi != NULL); IGI_LOCK(igi); if (igi->igi_flags & IGIF_LOOPBACK) { IGMP_PRINTF(("%s: ignore v3 query on IGIF_LOOPBACK " "ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); IGI_UNLOCK(igi); goto done; } /* * Discard the v3 query if we're in Compatibility Mode. * The RFC is not obviously worded that hosts need to stay in * compatibility mode until the Old Version Querier Present * timer expires. */ if (igi->igi_version != IGMP_VERSION_3) { IGMP_PRINTF(("%s: ignore v3 query in v%d mode on " "ifp 0x%llx(%s)\n", __func__, igi->igi_version, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); IGI_UNLOCK(igi); goto done; } itp.qpt = igmp_set_version(igi, IGMP_VERSION_3); igi->igi_rv = qrv; igi->igi_qi = qqi; igi->igi_qri = MAX(timer, IGMP_QRI_MIN); IGMP_PRINTF(("%s: qrv %d qi %d qri %d\n", __func__, igi->igi_rv, igi->igi_qi, igi->igi_qri)); if (is_general_query) { /* * Schedule a current-state report on this ifp for * all groups, possibly containing source lists. * If there is a pending General Query response * scheduled earlier than the selected delay, do * not schedule any other reports. * Otherwise, reset the interface timer. */ IGMP_PRINTF(("%s: process v3 general query on ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { itp.it = igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); } IGI_UNLOCK(igi); } else { IGI_UNLOCK(igi); /* * Group-source-specific queries are throttled on * a per-group basis to defeat denial-of-service attempts. * Queries for groups we are not a member of on this * link are simply ignored. */ in_multihead_lock_shared(); IN_LOOKUP_MULTI(&igmpv3->igmp_group, ifp, inm); in_multihead_lock_done(); if (inm == NULL) goto done; INM_LOCK(inm); if (nsrc > 0) { if (!ratecheck(&inm->inm_lastgsrtv, &igmp_gsrdelay)) { IGMP_PRINTF(("%s: GS query throttled.\n", __func__)); IGMPSTAT_INC(igps_drop_gsr_queries); INM_UNLOCK(inm); INM_REMREF(inm); /* from IN_LOOKUP_MULTI */ goto done; } } IGMP_INET_PRINTF(igmpv3->igmp_group, ("process v3 %s query on ifp 0x%llx(%s)\n", _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); /* * If there is a pending General Query response * scheduled sooner than the selected delay, no * further report need be scheduled. * Otherwise, prepare to respond to the * group-specific or group-and-source query. */ IGI_LOCK(igi); itp.it = igi->igi_v3_timer; IGI_UNLOCK(igi); if (itp.it == 0 || itp.it >= timer) { (void) igmp_input_v3_group_query(inm, timer, igmpv3); itp.cst = inm->inm_timer; } INM_UNLOCK(inm); INM_REMREF(inm); /* from IN_LOOKUP_MULTI */ } done: if (itp.it > 0) { IGMP_PRINTF(("%s: v3 general query response scheduled in " "T+%d seconds on ifp 0x%llx(%s)\n", __func__, itp.it, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); } igmp_set_timeout(&itp); return (0); } /* * Process a recieved IGMPv3 group-specific or group-and-source-specific * query. * Return <0 if any error occured. Currently this is ignored. */ static int igmp_input_v3_group_query(struct in_multi *inm, int timer, /*const*/ struct igmpv3 *igmpv3) { int retval; uint16_t nsrc; INM_LOCK_ASSERT_HELD(inm); retval = 0; switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: case IGMP_SLEEPING_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_AWAKENING_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_LEAVING_MEMBER: return (retval); case IGMP_REPORTING_MEMBER: case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: break; } nsrc = ntohs(igmpv3->igmp_numsrc); /* * Deal with group-specific queries upfront. * If any group query is already pending, purge any recorded * source-list state if it exists, and schedule a query response * for this group-specific query. */ if (nsrc == 0) { if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { inm_clear_recorded(inm); timer = min(inm->inm_timer, timer); } inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; inm->inm_timer = IGMP_RANDOM_DELAY(timer); return (retval); } /* * Deal with the case where a group-and-source-specific query has * been received but a group-specific query is already pending. */ if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { timer = min(inm->inm_timer, timer); inm->inm_timer = IGMP_RANDOM_DELAY(timer); return (retval); } /* * Finally, deal with the case where a group-and-source-specific * query has been received, where a response to a previous g-s-r * query exists, or none exists. * In this case, we need to parse the source-list which the Querier * has provided us with and check if we have any source list filter * entries at T1 for these sources. If we do not, there is no need * schedule a report and the query may be dropped. * If we do, we must record them and schedule a current-state * report for those sources. * FIXME: Handling source lists larger than 1 mbuf requires that * we pass the mbuf chain pointer down to this function, and use * m_getptr() to walk the chain. */ if (inm->inm_nsrc > 0) { const struct in_addr *ap; int i, nrecorded; ap = (const struct in_addr *)(igmpv3 + 1); nrecorded = 0; for (i = 0; i < nsrc; i++, ap++) { retval = inm_record_source(inm, ap->s_addr); if (retval < 0) break; nrecorded += retval; } if (nrecorded > 0) { IGMP_PRINTF(("%s: schedule response to SG query\n", __func__)); inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; inm->inm_timer = IGMP_RANDOM_DELAY(timer); } } return (retval); } /* * Process a received IGMPv1 host membership report. * * NOTE: 0.0.0.0 workaround breaks const correctness. */ static int igmp_input_v1_report(struct ifnet *ifp, struct mbuf *m, /*const*/ struct ip *ip, /*const*/ struct igmp *igmp) { struct in_ifaddr *ia; struct in_multi *inm; IGMPSTAT_INC(igps_rcv_reports); OIGMPSTAT_INC(igps_rcv_reports); if ((ifp->if_flags & IFF_LOOPBACK) || (m->m_pkthdr.pkt_flags & PKTF_LOOP)) return (0); if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr) || !in_hosteq(igmp->igmp_group, ip->ip_dst))) { IGMPSTAT_INC(igps_rcv_badreports); OIGMPSTAT_INC(igps_rcv_badreports); return (EINVAL); } /* * RFC 3376, Section 4.2.13, 9.2, 9.3: * Booting clients may use the source address 0.0.0.0. Some * IGMP daemons may not know how to use IP_RECVIF to determine * the interface upon which this message was received. * Replace 0.0.0.0 with the subnet address if told to do so. */ if (igmp_recvifkludge && in_nullhost(ip->ip_src)) { IFP_TO_IA(ifp, ia); if (ia != NULL) { IFA_LOCK(&ia->ia_ifa); ip->ip_src.s_addr = htonl(ia->ia_subnet); IFA_UNLOCK(&ia->ia_ifa); IFA_REMREF(&ia->ia_ifa); } } IGMP_INET_PRINTF(igmp->igmp_group, ("process v1 report %s on ifp 0x%llx(%s)\n", _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); /* * IGMPv1 report suppression. * If we are a member of this group, and our membership should be * reported, stop our group timer and transition to the 'lazy' state. */ in_multihead_lock_shared(); IN_LOOKUP_MULTI(&igmp->igmp_group, ifp, inm); in_multihead_lock_done(); if (inm != NULL) { struct igmp_ifinfo *igi; INM_LOCK(inm); igi = inm->inm_igi; VERIFY(igi != NULL); IGMPSTAT_INC(igps_rcv_ourreports); OIGMPSTAT_INC(igps_rcv_ourreports); /* * If we are in IGMPv3 host mode, do not allow the * other host's IGMPv1 report to suppress our reports * unless explicitly configured to do so. */ IGI_LOCK(igi); if (igi->igi_version == IGMP_VERSION_3) { if (igmp_legacysupp) igmp_v3_suppress_group_record(inm); IGI_UNLOCK(igi); INM_UNLOCK(inm); INM_REMREF(inm); /* from IN_LOOKUP_MULTI */ return (0); } INM_LOCK_ASSERT_HELD(inm); inm->inm_timer = 0; switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: break; case IGMP_IDLE_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_AWAKENING_MEMBER: IGMP_INET_PRINTF(igmp->igmp_group, ("report suppressed for %s on ifp 0x%llx(%s)\n", _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); case IGMP_SLEEPING_MEMBER: inm->inm_state = IGMP_SLEEPING_MEMBER; break; case IGMP_REPORTING_MEMBER: IGMP_INET_PRINTF(igmp->igmp_group, ("report suppressed for %s on ifp 0x%llx(%s)\n", _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); if (igi->igi_version == IGMP_VERSION_1) inm->inm_state = IGMP_LAZY_MEMBER; else if (igi->igi_version == IGMP_VERSION_2) inm->inm_state = IGMP_SLEEPING_MEMBER; break; case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: case IGMP_LEAVING_MEMBER: break; } IGI_UNLOCK(igi); INM_UNLOCK(inm); INM_REMREF(inm); /* from IN_LOOKUP_MULTI */ } return (0); } /* * Process a received IGMPv2 host membership report. * * NOTE: 0.0.0.0 workaround breaks const correctness. */ static int igmp_input_v2_report(struct ifnet *ifp, struct mbuf *m, /*const*/ struct ip *ip, /*const*/ struct igmp *igmp) { struct in_ifaddr *ia; struct in_multi *inm; /* * Make sure we don't hear our own membership report. Fast * leave requires knowing that we are the only member of a * group. */ IFP_TO_IA(ifp, ia); if (ia != NULL) { IFA_LOCK(&ia->ia_ifa); if (in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { IFA_UNLOCK(&ia->ia_ifa); IFA_REMREF(&ia->ia_ifa); return (0); } IFA_UNLOCK(&ia->ia_ifa); } IGMPSTAT_INC(igps_rcv_reports); OIGMPSTAT_INC(igps_rcv_reports); if ((ifp->if_flags & IFF_LOOPBACK) || (m->m_pkthdr.pkt_flags & PKTF_LOOP)) { if (ia != NULL) IFA_REMREF(&ia->ia_ifa); return (0); } if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || !in_hosteq(igmp->igmp_group, ip->ip_dst)) { if (ia != NULL) IFA_REMREF(&ia->ia_ifa); IGMPSTAT_INC(igps_rcv_badreports); OIGMPSTAT_INC(igps_rcv_badreports); return (EINVAL); } /* * RFC 3376, Section 4.2.13, 9.2, 9.3: * Booting clients may use the source address 0.0.0.0. Some * IGMP daemons may not know how to use IP_RECVIF to determine * the interface upon which this message was received. * Replace 0.0.0.0 with the subnet address if told to do so. */ if (igmp_recvifkludge && in_nullhost(ip->ip_src)) { if (ia != NULL) { IFA_LOCK(&ia->ia_ifa); ip->ip_src.s_addr = htonl(ia->ia_subnet); IFA_UNLOCK(&ia->ia_ifa); } } if (ia != NULL) IFA_REMREF(&ia->ia_ifa); IGMP_INET_PRINTF(igmp->igmp_group, ("process v2 report %s on ifp 0x%llx(%s)\n", _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); /* * IGMPv2 report suppression. * If we are a member of this group, and our membership should be * reported, and our group timer is pending or about to be reset, * stop our group timer by transitioning to the 'lazy' state. */ in_multihead_lock_shared(); IN_LOOKUP_MULTI(&igmp->igmp_group, ifp, inm); in_multihead_lock_done(); if (inm != NULL) { struct igmp_ifinfo *igi; INM_LOCK(inm); igi = inm->inm_igi; VERIFY(igi != NULL); IGMPSTAT_INC(igps_rcv_ourreports); OIGMPSTAT_INC(igps_rcv_ourreports); /* * If we are in IGMPv3 host mode, do not allow the * other host's IGMPv1 report to suppress our reports * unless explicitly configured to do so. */ IGI_LOCK(igi); if (igi->igi_version == IGMP_VERSION_3) { if (igmp_legacysupp) igmp_v3_suppress_group_record(inm); IGI_UNLOCK(igi); INM_UNLOCK(inm); INM_REMREF(inm); return (0); } inm->inm_timer = 0; switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: case IGMP_SLEEPING_MEMBER: break; case IGMP_REPORTING_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_AWAKENING_MEMBER: IGMP_INET_PRINTF(igmp->igmp_group, ("report suppressed for %s on ifp 0x%llx(%s)\n", _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp))); case IGMP_LAZY_MEMBER: inm->inm_state = IGMP_LAZY_MEMBER; break; case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: case IGMP_LEAVING_MEMBER: break; } IGI_UNLOCK(igi); INM_UNLOCK(inm); INM_REMREF(inm); } return (0); } void igmp_input(struct mbuf *m, int off) { int iphlen; struct ifnet *ifp; struct igmp *igmp; struct ip *ip; int igmplen; int minlen; int queryver; IGMP_PRINTF(("%s: called w/mbuf (0x%llx,%d)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m), off)); ifp = m->m_pkthdr.rcvif; IGMPSTAT_INC(igps_rcv_total); OIGMPSTAT_INC(igps_rcv_total); /* Expect 32-bit aligned data pointer on strict-align platforms */ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); ip = mtod(m, struct ip *); iphlen = off; /* By now, ip_len no longer contains the length of IP header */ igmplen = ip->ip_len; /* * Validate lengths. */ if (igmplen < IGMP_MINLEN) { IGMPSTAT_INC(igps_rcv_tooshort); OIGMPSTAT_INC(igps_rcv_tooshort); m_freem(m); return; } /* * Always pullup to the minimum size for v1/v2 or v3 * to amortize calls to m_pulldown(). */ if (igmplen >= IGMP_V3_QUERY_MINLEN) minlen = IGMP_V3_QUERY_MINLEN; else minlen = IGMP_MINLEN; /* A bit more expensive than M_STRUCT_GET, but ensures alignment */ M_STRUCT_GET0(igmp, struct igmp *, m, off, minlen); if (igmp == NULL) { IGMPSTAT_INC(igps_rcv_tooshort); OIGMPSTAT_INC(igps_rcv_tooshort); return; } /* N.B.: we assume the packet was correctly aligned in ip_input. */ /* * Validate checksum. */ m->m_data += iphlen; m->m_len -= iphlen; if (in_cksum(m, igmplen)) { IGMPSTAT_INC(igps_rcv_badsum); OIGMPSTAT_INC(igps_rcv_badsum); m_freem(m); return; } m->m_data -= iphlen; m->m_len += iphlen; /* * IGMP control traffic is link-scope, and must have a TTL of 1. * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; * probe packets may come from beyond the LAN. */ if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { IGMPSTAT_INC(igps_rcv_badttl); m_freem(m); return; } switch (igmp->igmp_type) { case IGMP_HOST_MEMBERSHIP_QUERY: if (igmplen == IGMP_MINLEN) { if (igmp->igmp_code == 0) queryver = IGMP_VERSION_1; else queryver = IGMP_VERSION_2; } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { queryver = IGMP_VERSION_3; } else { IGMPSTAT_INC(igps_rcv_tooshort); OIGMPSTAT_INC(igps_rcv_tooshort); m_freem(m); return; } OIGMPSTAT_INC(igps_rcv_queries); switch (queryver) { case IGMP_VERSION_1: IGMPSTAT_INC(igps_rcv_v1v2_queries); if (!igmp_v1enable) break; if (igmp_input_v1_query(ifp, ip, igmp) != 0) { m_freem(m); return; } break; case IGMP_VERSION_2: IGMPSTAT_INC(igps_rcv_v1v2_queries); if (!igmp_v2enable) break; if (igmp_input_v2_query(ifp, ip, igmp) != 0) { m_freem(m); return; } break; case IGMP_VERSION_3: { struct igmpv3 *igmpv3; uint16_t igmpv3len; uint16_t srclen; int nsrc; IGMPSTAT_INC(igps_rcv_v3_queries); igmpv3 = (struct igmpv3 *)igmp; /* * Validate length based on source count. */ nsrc = ntohs(igmpv3->igmp_numsrc); srclen = sizeof(struct in_addr) * nsrc; if (igmplen < (IGMP_V3_QUERY_MINLEN + srclen)) { IGMPSTAT_INC(igps_rcv_tooshort); OIGMPSTAT_INC(igps_rcv_tooshort); m_freem(m); return; } igmpv3len = IGMP_V3_QUERY_MINLEN + srclen; /* * A bit more expensive than M_STRUCT_GET, * but ensures alignment. */ M_STRUCT_GET0(igmpv3, struct igmpv3 *, m, off, igmpv3len); if (igmpv3 == NULL) { IGMPSTAT_INC(igps_rcv_tooshort); OIGMPSTAT_INC(igps_rcv_tooshort); return; } /* * N.B.: we assume the packet was correctly * aligned in ip_input. */ if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { m_freem(m); return; } } break; } break; case IGMP_v1_HOST_MEMBERSHIP_REPORT: if (!igmp_v1enable) break; if (igmp_input_v1_report(ifp, m, ip, igmp) != 0) { m_freem(m); return; } break; case IGMP_v2_HOST_MEMBERSHIP_REPORT: if (!igmp_v2enable) break; if (!ip_checkrouteralert(m)) IGMPSTAT_INC(igps_rcv_nora); if (igmp_input_v2_report(ifp, m, ip, igmp) != 0) { m_freem(m); return; } break; case IGMP_v3_HOST_MEMBERSHIP_REPORT: /* * Hosts do not need to process IGMPv3 membership reports, * as report suppression is no longer required. */ if (!ip_checkrouteralert(m)) IGMPSTAT_INC(igps_rcv_nora); break; default: break; } IGMP_LOCK_ASSERT_NOTHELD(); /* * Pass all valid IGMP packets up to any process(es) listening on a * raw IGMP socket. */ rip_input(m, off); } /* * Schedule IGMP timer based on various parameters; caller must ensure that * lock ordering is maintained as this routine acquires IGMP global lock. */ void igmp_set_timeout(struct igmp_tparams *itp) { IGMP_LOCK_ASSERT_NOTHELD(); VERIFY(itp != NULL); if (itp->qpt != 0 || itp->it != 0 || itp->cst != 0 || itp->sct != 0) { IGMP_LOCK(); if (itp->qpt != 0) querier_present_timers_running = 1; if (itp->it != 0) interface_timers_running = 1; if (itp->cst != 0) current_state_timers_running = 1; if (itp->sct != 0) state_change_timers_running = 1; igmp_sched_timeout(); IGMP_UNLOCK(); } } /* * IGMP timer handler (per 1 second). */ static void igmp_timeout(void *arg) { #pragma unused(arg) struct ifqueue scq; /* State-change packets */ struct ifqueue qrq; /* Query response packets */ struct ifnet *ifp; struct igmp_ifinfo *igi; struct in_multi *inm; int loop = 0, uri_sec = 0; SLIST_HEAD(, in_multi) inm_dthead; SLIST_INIT(&inm_dthead); /* * Update coarse-grained networking timestamp (in sec.); the idea * is to piggy-back on the timeout callout to update the counter * returnable via net_uptime(). */ net_update_uptime(); IGMP_LOCK(); IGMP_PRINTF(("%s: qpt %d, it %d, cst %d, sct %d\n", __func__, querier_present_timers_running, interface_timers_running, current_state_timers_running, state_change_timers_running)); /* * IGMPv1/v2 querier present timer processing. */ if (querier_present_timers_running) { querier_present_timers_running = 0; LIST_FOREACH(igi, &igi_head, igi_link) { IGI_LOCK(igi); igmp_v1v2_process_querier_timers(igi); if (igi->igi_v1_timer > 0 || igi->igi_v2_timer > 0) querier_present_timers_running = 1; IGI_UNLOCK(igi); } } /* * IGMPv3 General Query response timer processing. */ if (interface_timers_running) { IGMP_PRINTF(("%s: interface timers running\n", __func__)); interface_timers_running = 0; LIST_FOREACH(igi, &igi_head, igi_link) { IGI_LOCK(igi); if (igi->igi_version != IGMP_VERSION_3) { IGI_UNLOCK(igi); continue; } if (igi->igi_v3_timer == 0) { /* Do nothing. */ } else if (--igi->igi_v3_timer == 0) { if (igmp_v3_dispatch_general_query(igi) > 0) interface_timers_running = 1; } else { interface_timers_running = 1; } IGI_UNLOCK(igi); } } if (!current_state_timers_running && !state_change_timers_running) goto out_locked; current_state_timers_running = 0; state_change_timers_running = 0; memset(&qrq, 0, sizeof(struct ifqueue)); qrq.ifq_maxlen = IGMP_MAX_G_GS_PACKETS; memset(&scq, 0, sizeof(struct ifqueue)); scq.ifq_maxlen = IGMP_MAX_STATE_CHANGE_PACKETS; IGMP_PRINTF(("%s: state change timers running\n", __func__)); /* * IGMPv1/v2/v3 host report and state-change timer processing. * Note: Processing a v3 group timer may remove a node. */ LIST_FOREACH(igi, &igi_head, igi_link) { struct in_multistep step; IGI_LOCK(igi); ifp = igi->igi_ifp; loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; uri_sec = IGMP_RANDOM_DELAY(igi->igi_uri); IGI_UNLOCK(igi); in_multihead_lock_shared(); IN_FIRST_MULTI(step, inm); while (inm != NULL) { INM_LOCK(inm); if (inm->inm_ifp != ifp) goto next; IGI_LOCK(igi); switch (igi->igi_version) { case IGMP_VERSION_1: case IGMP_VERSION_2: igmp_v1v2_process_group_timer(inm, igi->igi_version); break; case IGMP_VERSION_3: igmp_v3_process_group_timers(igi, &qrq, &scq, inm, uri_sec); break; } IGI_UNLOCK(igi); next: INM_UNLOCK(inm); IN_NEXT_MULTI(step, inm); } in_multihead_lock_done(); IGI_LOCK(igi); if (igi->igi_version == IGMP_VERSION_1 || igi->igi_version == IGMP_VERSION_2) { igmp_dispatch_queue(igi, &igi->igi_v2q, 0, loop); } else if (igi->igi_version == IGMP_VERSION_3) { IGI_UNLOCK(igi); igmp_dispatch_queue(NULL, &qrq, 0, loop); igmp_dispatch_queue(NULL, &scq, 0, loop); VERIFY(qrq.ifq_len == 0); VERIFY(scq.ifq_len == 0); IGI_LOCK(igi); } /* * In case there are still any pending membership reports * which didn't get drained at version change time. */ IF_DRAIN(&igi->igi_v2q); /* * Release all deferred inm records, and drain any locally * enqueued packets; do it even if the current IGMP version * for the link is no longer IGMPv3, in order to handle the * version change case. */ igmp_flush_relq(igi, (struct igmp_inm_relhead *)&inm_dthead); VERIFY(SLIST_EMPTY(&igi->igi_relinmhead)); IGI_UNLOCK(igi); IF_DRAIN(&qrq); IF_DRAIN(&scq); } out_locked: /* re-arm the timer if there's work to do */ igmp_timeout_run = 0; igmp_sched_timeout(); IGMP_UNLOCK(); /* Now that we're dropped all locks, release detached records */ IGMP_REMOVE_DETACHED_INM(&inm_dthead); } static void igmp_sched_timeout(void) { IGMP_LOCK_ASSERT_HELD(); if (!igmp_timeout_run && (querier_present_timers_running || current_state_timers_running || interface_timers_running || state_change_timers_running)) { igmp_timeout_run = 1; timeout(igmp_timeout, NULL, hz); } } /* * Free the in_multi reference(s) for this IGMP lifecycle. * * Caller must be holding igi_lock. */ static void igmp_flush_relq(struct igmp_ifinfo *igi, struct igmp_inm_relhead *inm_dthead) { struct in_multi *inm; again: IGI_LOCK_ASSERT_HELD(igi); inm = SLIST_FIRST(&igi->igi_relinmhead); if (inm != NULL) { int lastref; SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele); IGI_UNLOCK(igi); in_multihead_lock_exclusive(); INM_LOCK(inm); VERIFY(inm->inm_nrelecnt != 0); inm->inm_nrelecnt--; lastref = in_multi_detach(inm); VERIFY(!lastref || (!(inm->inm_debug & IFD_ATTACHED) && inm->inm_reqcnt == 0)); INM_UNLOCK(inm); in_multihead_lock_done(); /* from igi_relinmhead */ INM_REMREF(inm); /* from in_multihead list */ if (lastref) { /* * Defer releasing our final reference, as we * are holding the IGMP lock at this point, and * we could end up with locking issues later on * (while issuing SIOCDELMULTI) when this is the * final reference count. Let the caller do it * when it is safe. */ IGMP_ADD_DETACHED_INM(inm_dthead, inm); } IGI_LOCK(igi); goto again; } } /* * Update host report group timer for IGMPv1/v2. * Will update the global pending timer flags. */ static void igmp_v1v2_process_group_timer(struct in_multi *inm, const int igmp_version) { int report_timer_expired; IGMP_LOCK_ASSERT_HELD(); INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(inm->inm_igi); if (inm->inm_timer == 0) { report_timer_expired = 0; } else if (--inm->inm_timer == 0) { report_timer_expired = 1; } else { current_state_timers_running = 1; /* caller will schedule timer */ return; } switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_SLEEPING_MEMBER: case IGMP_AWAKENING_MEMBER: break; case IGMP_REPORTING_MEMBER: if (report_timer_expired) { inm->inm_state = IGMP_IDLE_MEMBER; (void) igmp_v1v2_queue_report(inm, (igmp_version == IGMP_VERSION_2) ? IGMP_v2_HOST_MEMBERSHIP_REPORT : IGMP_v1_HOST_MEMBERSHIP_REPORT); INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(inm->inm_igi); } break; case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: case IGMP_LEAVING_MEMBER: break; } } /* * Update a group's timers for IGMPv3. * Will update the global pending timer flags. * Note: Unlocked read from igi. */ static void igmp_v3_process_group_timers(struct igmp_ifinfo *igi, struct ifqueue *qrq, struct ifqueue *scq, struct in_multi *inm, const int uri_sec) { int query_response_timer_expired; int state_change_retransmit_timer_expired; IGMP_LOCK_ASSERT_HELD(); INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(igi); VERIFY(igi == inm->inm_igi); query_response_timer_expired = 0; state_change_retransmit_timer_expired = 0; /* * During a transition from v1/v2 compatibility mode back to v3, * a group record in REPORTING state may still have its group * timer active. This is a no-op in this function; it is easier * to deal with it here than to complicate the timeout path. */ if (inm->inm_timer == 0) { query_response_timer_expired = 0; } else if (--inm->inm_timer == 0) { query_response_timer_expired = 1; } else { current_state_timers_running = 1; /* caller will schedule timer */ } if (inm->inm_sctimer == 0) { state_change_retransmit_timer_expired = 0; } else if (--inm->inm_sctimer == 0) { state_change_retransmit_timer_expired = 1; } else { state_change_timers_running = 1; /* caller will schedule timer */ } /* We are in timer callback, so be quick about it. */ if (!state_change_retransmit_timer_expired && !query_response_timer_expired) return; switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: case IGMP_SLEEPING_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_AWAKENING_MEMBER: case IGMP_IDLE_MEMBER: break; case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: /* * Respond to a previously pending Group-Specific * or Group-and-Source-Specific query by enqueueing * the appropriate Current-State report for * immediate transmission. */ if (query_response_timer_expired) { int retval; retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); IGMP_PRINTF(("%s: enqueue record = %d\n", __func__, retval)); inm->inm_state = IGMP_REPORTING_MEMBER; /* XXX Clear recorded sources for next time. */ inm_clear_recorded(inm); } /* FALLTHROUGH */ case IGMP_REPORTING_MEMBER: case IGMP_LEAVING_MEMBER: if (state_change_retransmit_timer_expired) { /* * State-change retransmission timer fired. * If there are any further pending retransmissions, * set the global pending state-change flag, and * reset the timer. */ if (--inm->inm_scrv > 0) { inm->inm_sctimer = uri_sec; state_change_timers_running = 1; /* caller will schedule timer */ } /* * Retransmit the previously computed state-change * report. If there are no further pending * retransmissions, the mbuf queue will be consumed. * Update T0 state to T1 as we have now sent * a state-change. */ (void) igmp_v3_merge_state_changes(inm, scq); inm_commit(inm); IGMP_INET_PRINTF(inm->inm_addr, ("%s: T1 -> T0 for %s/%s\n", __func__, _igmp_inet_buf, if_name(inm->inm_ifp))); /* * If we are leaving the group for good, make sure * we release IGMP's reference to it. * This release must be deferred using a SLIST, * as we are called from a loop which traverses * the in_multihead list. */ if (inm->inm_state == IGMP_LEAVING_MEMBER && inm->inm_scrv == 0) { inm->inm_state = IGMP_NOT_MEMBER; /* * A reference has already been held in * igmp_final_leave() for this inm, so * no need to hold another one. We also * bumped up its request count then, so * that it stays in in_multihead. Both * of them will be released when it is * dequeued later on. */ VERIFY(inm->inm_nrelecnt != 0); SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele); } } break; } } /* * Suppress a group's pending response to a group or source/group query. * * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. * Do NOT update ST1/ST0 as this operation merely suppresses * the currently pending group record. * Do NOT suppress the response to a general query. It is possible but * it would require adding another state or flag. */ static void igmp_v3_suppress_group_record(struct in_multi *inm) { INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(inm->inm_igi); VERIFY(inm->inm_igi->igi_version == IGMP_VERSION_3); if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) return; if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) inm_clear_recorded(inm); inm->inm_timer = 0; inm->inm_state = IGMP_REPORTING_MEMBER; } /* * Switch to a different IGMP version on the given interface, * as per Section 7.2.1. */ static uint32_t igmp_set_version(struct igmp_ifinfo *igi, const int igmp_version) { int old_version_timer; IGI_LOCK_ASSERT_HELD(igi); IGMP_PRINTF(("%s: switching to v%d on ifp 0x%llx(%s)\n", __func__, igmp_version, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), if_name(igi->igi_ifp))); if (igmp_version == IGMP_VERSION_1 || igmp_version == IGMP_VERSION_2) { /* * Compute the "Older Version Querier Present" timer as per * Section 8.12, in seconds. */ old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; if (igmp_version == IGMP_VERSION_1) { igi->igi_v1_timer = old_version_timer; igi->igi_v2_timer = 0; } else if (igmp_version == IGMP_VERSION_2) { igi->igi_v1_timer = 0; igi->igi_v2_timer = old_version_timer; } } if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { if (igi->igi_version != IGMP_VERSION_2) { igi->igi_version = IGMP_VERSION_2; igmp_v3_cancel_link_timers(igi); } } else if (igi->igi_v1_timer > 0) { if (igi->igi_version != IGMP_VERSION_1) { igi->igi_version = IGMP_VERSION_1; igmp_v3_cancel_link_timers(igi); } } IGI_LOCK_ASSERT_HELD(igi); return (MAX(igi->igi_v1_timer, igi->igi_v2_timer)); } /* * Cancel pending IGMPv3 timers for the given link and all groups * joined on it; state-change, general-query, and group-query timers. * * Only ever called on a transition from v3 to Compatibility mode. Kill * the timers stone dead (this may be expensive for large N groups), they * will be restarted if Compatibility Mode deems that they must be due to * query processing. */ static void igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi) { struct ifnet *ifp; struct in_multi *inm; struct in_multistep step; IGI_LOCK_ASSERT_HELD(igi); IGMP_PRINTF(("%s: cancel v3 timers on ifp 0x%llx(%s)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), if_name(igi->igi_ifp))); /* * Stop the v3 General Query Response on this link stone dead. * If timer is woken up due to interface_timers_running, * the flag will be cleared if there are no pending link timers. */ igi->igi_v3_timer = 0; /* * Now clear the current-state and state-change report timers * for all memberships scoped to this link. */ ifp = igi->igi_ifp; IGI_UNLOCK(igi); in_multihead_lock_shared(); IN_FIRST_MULTI(step, inm); while (inm != NULL) { INM_LOCK(inm); if (inm->inm_ifp != ifp) goto next; switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_SLEEPING_MEMBER: case IGMP_AWAKENING_MEMBER: /* * These states are either not relevant in v3 mode, * or are unreported. Do nothing. */ break; case IGMP_LEAVING_MEMBER: /* * If we are leaving the group and switching to * compatibility mode, we need to release the final * reference held for issuing the INCLUDE {}, and * transition to REPORTING to ensure the host leave * message is sent upstream to the old querier -- * transition to NOT would lose the leave and race. * During igmp_final_leave(), we bumped up both the * request and reference counts. Since we cannot * call in_multi_detach() here, defer this task to * the timer routine. */ VERIFY(inm->inm_nrelecnt != 0); IGI_LOCK(igi); SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele); IGI_UNLOCK(igi); /* FALLTHROUGH */ case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: inm_clear_recorded(inm); /* FALLTHROUGH */ case IGMP_REPORTING_MEMBER: inm->inm_state = IGMP_REPORTING_MEMBER; break; } /* * Always clear state-change and group report timers. * Free any pending IGMPv3 state-change records. */ inm->inm_sctimer = 0; inm->inm_timer = 0; IF_DRAIN(&inm->inm_scq); next: INM_UNLOCK(inm); IN_NEXT_MULTI(step, inm); } in_multihead_lock_done(); IGI_LOCK(igi); } /* * Update the Older Version Querier Present timers for a link. * See Section 7.2.1 of RFC 3376. */ static void igmp_v1v2_process_querier_timers(struct igmp_ifinfo *igi) { IGI_LOCK_ASSERT_HELD(igi); if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { /* * IGMPv1 and IGMPv2 Querier Present timers expired. * * Revert to IGMPv3. */ if (igi->igi_version != IGMP_VERSION_3) { IGMP_PRINTF(("%s: transition from v%d -> v%d " "on 0x%llx(%s)\n", __func__, igi->igi_version, IGMP_VERSION_3, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), if_name(igi->igi_ifp))); igi->igi_version = IGMP_VERSION_3; IF_DRAIN(&igi->igi_v2q); } } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { /* * IGMPv1 Querier Present timer expired, * IGMPv2 Querier Present timer running. * If IGMPv2 was disabled since last timeout, * revert to IGMPv3. * If IGMPv2 is enabled, revert to IGMPv2. */ if (!igmp_v2enable) { IGMP_PRINTF(("%s: transition from v%d -> v%d " "on 0x%llx(%s%d)\n", __func__, igi->igi_version, IGMP_VERSION_3, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), igi->igi_ifp->if_name, igi->igi_ifp->if_unit)); igi->igi_v2_timer = 0; igi->igi_version = IGMP_VERSION_3; IF_DRAIN(&igi->igi_v2q); } else { --igi->igi_v2_timer; if (igi->igi_version != IGMP_VERSION_2) { IGMP_PRINTF(("%s: transition from v%d -> v%d " "on 0x%llx(%s)\n", __func__, igi->igi_version, IGMP_VERSION_2, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), if_name(igi->igi_ifp))); igi->igi_version = IGMP_VERSION_2; IF_DRAIN(&igi->igi_gq); igmp_v3_cancel_link_timers(igi); } } } else if (igi->igi_v1_timer > 0) { /* * IGMPv1 Querier Present timer running. * Stop IGMPv2 timer if running. * * If IGMPv1 was disabled since last timeout, * revert to IGMPv3. * If IGMPv1 is enabled, reset IGMPv2 timer if running. */ if (!igmp_v1enable) { IGMP_PRINTF(("%s: transition from v%d -> v%d " "on 0x%llx(%s%d)\n", __func__, igi->igi_version, IGMP_VERSION_3, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), igi->igi_ifp->if_name, igi->igi_ifp->if_unit)); igi->igi_v1_timer = 0; igi->igi_version = IGMP_VERSION_3; IF_DRAIN(&igi->igi_v2q); } else { --igi->igi_v1_timer; } if (igi->igi_v2_timer > 0) { IGMP_PRINTF(("%s: cancel v2 timer on 0x%llx(%s%d)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), igi->igi_ifp->if_name, igi->igi_ifp->if_unit)); igi->igi_v2_timer = 0; } } } /* * Dispatch an IGMPv1/v2 host report or leave message. * These are always small enough to fit inside a single mbuf. */ static int igmp_v1v2_queue_report(struct in_multi *inm, const int type) { struct ifnet *ifp; struct igmp *igmp; struct ip *ip; struct mbuf *m; int error = 0; INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(inm->inm_igi); ifp = inm->inm_ifp; MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) return (ENOMEM); MH_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); m->m_data += sizeof(struct ip); m->m_len = sizeof(struct igmp); igmp = mtod(m, struct igmp *); igmp->igmp_type = type; igmp->igmp_code = 0; igmp->igmp_group = inm->inm_addr; igmp->igmp_cksum = 0; igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); m->m_data -= sizeof(struct ip); m->m_len += sizeof(struct ip); ip = mtod(m, struct ip *); ip->ip_tos = 0; ip->ip_len = sizeof(struct ip) + sizeof(struct igmp); ip->ip_off = 0; ip->ip_p = IPPROTO_IGMP; ip->ip_src.s_addr = INADDR_ANY; if (type == IGMP_HOST_LEAVE_MESSAGE) ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); else ip->ip_dst = inm->inm_addr; igmp_save_context(m, ifp); m->m_flags |= M_IGMPV2; if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) m->m_flags |= M_IGMP_LOOP; /* * Due to the fact that at this point we are possibly holding * in_multihead_lock in shared or exclusive mode, we can't call * igmp_sendpkt() here since that will eventually call ip_output(), * which will try to lock in_multihead_lock and cause a deadlock. * Instead we defer the work to the igmp_timeout() thread, thus * avoiding unlocking in_multihead_lock here. */ if (IF_QFULL(&inm->inm_igi->igi_v2q)) { IGMP_PRINTF(("%s: v1/v2 outbound queue full\n", __func__)); error = ENOMEM; m_freem(m); } else { IF_ENQUEUE(&inm->inm_igi->igi_v2q, m); VERIFY(error == 0); } return (error); } /* * Process a state change from the upper layer for the given IPv4 group. * * Each socket holds a reference on the in_multi in its own ip_moptions. * The socket layer will have made the necessary updates to the group * state, it is now up to IGMP to issue a state change report if there * has been any change between T0 (when the last state-change was issued) * and T1 (now). * * We use the IGMPv3 state machine at group level. The IGMP module * however makes the decision as to which IGMP protocol version to speak. * A state change *from* INCLUDE {} always means an initial join. * A state change *to* INCLUDE {} always means a final leave. * * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can * save ourselves a bunch of work; any exclusive mode groups need not * compute source filter lists. */ int igmp_change_state(struct in_multi *inm, struct igmp_tparams *itp) { struct igmp_ifinfo *igi; struct ifnet *ifp; int error = 0; VERIFY(itp != NULL); bzero(itp, sizeof (*itp)); INM_LOCK_ASSERT_HELD(inm); VERIFY(inm->inm_igi != NULL); IGI_LOCK_ASSERT_NOTHELD(inm->inm_igi); /* * Try to detect if the upper layer just asked us to change state * for an interface which has now gone away. */ VERIFY(inm->inm_ifma != NULL); ifp = inm->inm_ifma->ifma_ifp; /* * Sanity check that netinet's notion of ifp is the same as net's. */ VERIFY(inm->inm_ifp == ifp); igi = IGMP_IFINFO(ifp); VERIFY(igi != NULL); /* * If we detect a state transition to or from MCAST_UNDEFINED * for this group, then we are starting or finishing an IGMP * life cycle for this group. */ if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { IGMP_PRINTF(("%s: inm transition %d -> %d\n", __func__, inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode)); if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { IGMP_PRINTF(("%s: initial join\n", __func__)); error = igmp_initial_join(inm, igi, itp); goto out; } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { IGMP_PRINTF(("%s: final leave\n", __func__)); igmp_final_leave(inm, igi, itp); goto out; } } else { IGMP_PRINTF(("%s: filter set change\n", __func__)); } error = igmp_handle_state_change(inm, igi, itp); out: return (error); } /* * Perform the initial join for an IGMP group. * * When joining a group: * If the group should have its IGMP traffic suppressed, do nothing. * IGMPv1 starts sending IGMPv1 host membership reports. * IGMPv2 starts sending IGMPv2 host membership reports. * IGMPv3 will schedule an IGMPv3 state-change report containing the * initial state of the membership. */ static int igmp_initial_join(struct in_multi *inm, struct igmp_ifinfo *igi, struct igmp_tparams *itp) { struct ifnet *ifp; struct ifqueue *ifq; int error, retval, syncstates; INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_NOTHELD(igi); VERIFY(itp != NULL); IGMP_INET_PRINTF(inm->inm_addr, ("%s: initial join %s on ifp 0x%llx(%s)\n", __func__, _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(inm->inm_ifp), if_name(inm->inm_ifp))); error = 0; syncstates = 1; ifp = inm->inm_ifp; IGI_LOCK(igi); VERIFY(igi->igi_ifp == ifp); /* * Groups joined on loopback or marked as 'not reported', * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and * are never reported in any IGMP protocol exchanges. * All other groups enter the appropriate IGMP state machine * for the version in use on this link. * A link marked as IGIF_SILENT causes IGMP to be completely * disabled for the link. */ if ((ifp->if_flags & IFF_LOOPBACK) || (igi->igi_flags & IGIF_SILENT) || !igmp_isgroupreported(inm->inm_addr)) { IGMP_PRINTF(("%s: not kicking state machine for silent group\n", __func__)); inm->inm_state = IGMP_SILENT_MEMBER; inm->inm_timer = 0; } else { /* * Deal with overlapping in_multi lifecycle. * If this group was LEAVING, then make sure * we drop the reference we picked up to keep the * group around for the final INCLUDE {} enqueue. * Since we cannot call in_multi_detach() here, * defer this task to the timer routine. */ if (igi->igi_version == IGMP_VERSION_3 && inm->inm_state == IGMP_LEAVING_MEMBER) { VERIFY(inm->inm_nrelecnt != 0); SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele); } inm->inm_state = IGMP_REPORTING_MEMBER; switch (igi->igi_version) { case IGMP_VERSION_1: case IGMP_VERSION_2: inm->inm_state = IGMP_IDLE_MEMBER; error = igmp_v1v2_queue_report(inm, (igi->igi_version == IGMP_VERSION_2) ? IGMP_v2_HOST_MEMBERSHIP_REPORT : IGMP_v1_HOST_MEMBERSHIP_REPORT); INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(igi); if (error == 0) { inm->inm_timer = IGMP_RANDOM_DELAY(IGMP_V1V2_MAX_RI); itp->cst = 1; } break; case IGMP_VERSION_3: /* * Defer update of T0 to T1, until the first copy * of the state change has been transmitted. */ syncstates = 0; /* * Immediately enqueue a State-Change Report for * this interface, freeing any previous reports. * Don't kick the timers if there is nothing to do, * or if an error occurred. */ ifq = &inm->inm_scq; IF_DRAIN(ifq); retval = igmp_v3_enqueue_group_record(ifq, inm, 1, 0, 0); itp->cst = (ifq->ifq_len > 0); IGMP_PRINTF(("%s: enqueue record = %d\n", __func__, retval)); if (retval <= 0) { error = retval * -1; break; } /* * Schedule transmission of pending state-change * report up to RV times for this link. The timer * will fire at the next igmp_timeout (1 second), * giving us an opportunity to merge the reports. */ if (igi->igi_flags & IGIF_LOOPBACK) { inm->inm_scrv = 1; } else { VERIFY(igi->igi_rv > 1); inm->inm_scrv = igi->igi_rv; } inm->inm_sctimer = 1; itp->sct = 1; error = 0; break; } } IGI_UNLOCK(igi); /* * Only update the T0 state if state change is atomic, * i.e. we don't need to wait for a timer to fire before we * can consider the state change to have been communicated. */ if (syncstates) { inm_commit(inm); IGMP_INET_PRINTF(inm->inm_addr, ("%s: T1 -> T0 for %s/%s\n", __func__, _igmp_inet_buf, if_name(inm->inm_ifp))); } return (error); } /* * Issue an intermediate state change during the IGMP life-cycle. */ static int igmp_handle_state_change(struct in_multi *inm, struct igmp_ifinfo *igi, struct igmp_tparams *itp) { struct ifnet *ifp; int retval = 0; INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_NOTHELD(igi); VERIFY(itp != NULL); IGMP_INET_PRINTF(inm->inm_addr, ("%s: state change for %s on ifp 0x%llx(%s)\n", __func__, _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(inm->inm_ifp), if_name(inm->inm_ifp))); ifp = inm->inm_ifp; IGI_LOCK(igi); VERIFY(igi->igi_ifp == ifp); if ((ifp->if_flags & IFF_LOOPBACK) || (igi->igi_flags & IGIF_SILENT) || !igmp_isgroupreported(inm->inm_addr) || (igi->igi_version != IGMP_VERSION_3)) { IGI_UNLOCK(igi); if (!igmp_isgroupreported(inm->inm_addr)) { IGMP_PRINTF(("%s: not kicking state " "machine for silent group\n", __func__)); } IGMP_PRINTF(("%s: nothing to do\n", __func__)); inm_commit(inm); IGMP_INET_PRINTF(inm->inm_addr, ("%s: T1 -> T0 for %s/%s\n", __func__, _igmp_inet_buf, inm->inm_ifp->if_name)); goto done; } IF_DRAIN(&inm->inm_scq); retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); itp->cst = (inm->inm_scq.ifq_len > 0); IGMP_PRINTF(("%s: enqueue record = %d\n", __func__, retval)); if (retval <= 0) { IGI_UNLOCK(igi); retval *= -1; goto done; } /* * If record(s) were enqueued, start the state-change * report timer for this group. */ inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); inm->inm_sctimer = 1; itp->sct = 1; IGI_UNLOCK(igi); done: return (retval); } /* * Perform the final leave for an IGMP group. * * When leaving a group: * IGMPv1 does nothing. * IGMPv2 sends a host leave message, if and only if we are the reporter. * IGMPv3 enqueues a state-change report containing a transition * to INCLUDE {} for immediate transmission. */ static void igmp_final_leave(struct in_multi *inm, struct igmp_ifinfo *igi, struct igmp_tparams *itp) { int syncstates = 1; INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_NOTHELD(igi); VERIFY(itp != NULL); IGMP_INET_PRINTF(inm->inm_addr, ("%s: final leave %s on ifp 0x%llx(%s)\n", __func__, _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(inm->inm_ifp), if_name(inm->inm_ifp))); switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: case IGMP_LEAVING_MEMBER: /* Already leaving or left; do nothing. */ IGMP_PRINTF(("%s: not kicking state machine for silent group\n", __func__)); break; case IGMP_REPORTING_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: IGI_LOCK(igi); if (igi->igi_version == IGMP_VERSION_2) { if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { panic("%s: IGMPv3 state reached, not IGMPv3 " "mode\n", __func__); /* NOTREACHED */ } /* scheduler timer if enqueue is successful */ itp->cst = (igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE) == 0); INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(igi); inm->inm_state = IGMP_NOT_MEMBER; } else if (igi->igi_version == IGMP_VERSION_3) { /* * Stop group timer and all pending reports. * Immediately enqueue a state-change report * TO_IN {} to be sent on the next timeout, * giving us an opportunity to merge reports. */ IF_DRAIN(&inm->inm_scq); inm->inm_timer = 0; if (igi->igi_flags & IGIF_LOOPBACK) { inm->inm_scrv = 1; } else { inm->inm_scrv = igi->igi_rv; } IGMP_INET_PRINTF(inm->inm_addr, ("%s: Leaving %s/%s with %d " "pending retransmissions.\n", __func__, _igmp_inet_buf, if_name(inm->inm_ifp), inm->inm_scrv)); if (inm->inm_scrv == 0) { inm->inm_state = IGMP_NOT_MEMBER; inm->inm_sctimer = 0; } else { int retval; /* * Stick around in the in_multihead list; * the final detach will be issued by * igmp_v3_process_group_timers() when * the retransmit timer expires. */ INM_ADDREF_LOCKED(inm); VERIFY(inm->inm_debug & IFD_ATTACHED); inm->inm_reqcnt++; VERIFY(inm->inm_reqcnt >= 1); inm->inm_nrelecnt++; VERIFY(inm->inm_nrelecnt != 0); retval = igmp_v3_enqueue_group_record( &inm->inm_scq, inm, 1, 0, 0); itp->cst = (inm->inm_scq.ifq_len > 0); KASSERT(retval != 0, ("%s: enqueue record = %d\n", __func__, retval)); inm->inm_state = IGMP_LEAVING_MEMBER; inm->inm_sctimer = 1; itp->sct = 1; syncstates = 0; } } IGI_UNLOCK(igi); break; case IGMP_LAZY_MEMBER: case IGMP_SLEEPING_MEMBER: case IGMP_AWAKENING_MEMBER: /* Our reports are suppressed; do nothing. */ break; } if (syncstates) { inm_commit(inm); IGMP_INET_PRINTF(inm->inm_addr, ("%s: T1 -> T0 for %s/%s\n", __func__, _igmp_inet_buf, if_name(inm->inm_ifp))); inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; IGMP_INET_PRINTF(inm->inm_addr, ("%s: T1 now MCAST_UNDEFINED for %s/%s\n", __func__, _igmp_inet_buf, if_name(inm->inm_ifp))); } } /* * Enqueue an IGMPv3 group record to the given output queue. * * XXX This function could do with having the allocation code * split out, and the multiple-tree-walks coalesced into a single * routine as has been done in igmp_v3_enqueue_filter_change(). * * If is_state_change is zero, a current-state record is appended. * If is_state_change is non-zero, a state-change report is appended. * * If is_group_query is non-zero, an mbuf packet chain is allocated. * If is_group_query is zero, and if there is a packet with free space * at the tail of the queue, it will be appended to providing there * is enough free space. * Otherwise a new mbuf packet chain is allocated. * * If is_source_query is non-zero, each source is checked to see if * it was recorded for a Group-Source query, and will be omitted if * it is not both in-mode and recorded. * * The function will attempt to allocate leading space in the packet * for the IP/IGMP header to be prepended without fragmenting the chain. * * If successful the size of all data appended to the queue is returned, * otherwise an error code less than zero is returned, or zero if * no record(s) were appended. */ static int igmp_v3_enqueue_group_record(struct ifqueue *ifq, struct in_multi *inm, const int is_state_change, const int is_group_query, const int is_source_query) { struct igmp_grouprec ig; struct igmp_grouprec *pig; struct ifnet *ifp; struct ip_msource *ims, *nims; struct mbuf *m0, *m, *md; int error, is_filter_list_change; int minrec0len, m0srcs, msrcs, nbytes, off; int record_has_sources; int now; int type; in_addr_t naddr; uint8_t mode; u_int16_t ig_numsrc; INM_LOCK_ASSERT_HELD(inm); IGI_LOCK_ASSERT_HELD(inm->inm_igi); error = 0; ifp = inm->inm_ifp; is_filter_list_change = 0; m = NULL; m0 = NULL; m0srcs = 0; msrcs = 0; nbytes = 0; nims = NULL; record_has_sources = 1; pig = NULL; type = IGMP_DO_NOTHING; mode = inm->inm_st[1].iss_fmode; /* * If we did not transition out of ASM mode during t0->t1, * and there are no source nodes to process, we can skip * the generation of source records. */ if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && inm->inm_nsrc == 0) record_has_sources = 0; if (is_state_change) { /* * Queue a state change record. * If the mode did not change, and there are non-ASM * listeners or source filters present, * we potentially need to issue two records for the group. * If we are transitioning to MCAST_UNDEFINED, we need * not send any sources. * If there are ASM listeners, and there was no filter * mode transition of any kind, do nothing. */ if (mode != inm->inm_st[0].iss_fmode) { if (mode == MCAST_EXCLUDE) { IGMP_PRINTF(("%s: change to EXCLUDE\n", __func__)); type = IGMP_CHANGE_TO_EXCLUDE_MODE; } else { IGMP_PRINTF(("%s: change to INCLUDE\n", __func__)); type = IGMP_CHANGE_TO_INCLUDE_MODE; if (mode == MCAST_UNDEFINED) record_has_sources = 0; } } else { if (record_has_sources) { is_filter_list_change = 1; } else { type = IGMP_DO_NOTHING; } } } else { /* * Queue a current state record. */ if (mode == MCAST_EXCLUDE) { type = IGMP_MODE_IS_EXCLUDE; } else if (mode == MCAST_INCLUDE) { type = IGMP_MODE_IS_INCLUDE; VERIFY(inm->inm_st[1].iss_asm == 0); } } /* * Generate the filter list changes using a separate function. */ if (is_filter_list_change) return (igmp_v3_enqueue_filter_change(ifq, inm)); if (type == IGMP_DO_NOTHING) { IGMP_INET_PRINTF(inm->inm_addr, ("%s: nothing to do for %s/%s\n", __func__, _igmp_inet_buf, if_name(inm->inm_ifp))); return (0); } /* * If any sources are present, we must be able to fit at least * one in the trailing space of the tail packet's mbuf, * ideally more. */ minrec0len = sizeof(struct igmp_grouprec); if (record_has_sources) minrec0len += sizeof(in_addr_t); IGMP_INET_PRINTF(inm->inm_addr, ("%s: queueing %s for %s/%s\n", __func__, igmp_rec_type_to_str(type), _igmp_inet_buf, if_name(inm->inm_ifp))); /* * Check if we have a packet in the tail of the queue for this * group into which the first group record for this group will fit. * Otherwise allocate a new packet. * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. * Note: Group records for G/GSR query responses MUST be sent * in their own packet. */ m0 = ifq->ifq_tail; if (!is_group_query && m0 != NULL && (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && (m0->m_pkthdr.len + minrec0len) < (ifp->if_mtu - IGMP_LEADINGSPACE)) { m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); m = m0; IGMP_PRINTF(("%s: use existing packet\n", __func__)); } else { if (IF_QFULL(ifq)) { IGMP_PRINTF(("%s: outbound queue full\n", __func__)); return (-ENOMEM); } m = NULL; m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); if (!is_state_change && !is_group_query) { m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); if (m) m->m_data += IGMP_LEADINGSPACE; } if (m == NULL) { m = m_gethdr(M_DONTWAIT, MT_DATA); if (m) MH_ALIGN(m, IGMP_LEADINGSPACE); } if (m == NULL) return (-ENOMEM); igmp_save_context(m, ifp); IGMP_PRINTF(("%s: allocated first packet\n", __func__)); } /* * Append group record. * If we have sources, we don't know how many yet. */ ig.ig_type = type; ig.ig_datalen = 0; ig.ig_numsrc = 0; ig.ig_group = inm->inm_addr; if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { if (m != m0) m_freem(m); IGMP_PRINTF(("%s: m_append() failed.\n", __func__)); return (-ENOMEM); } nbytes += sizeof(struct igmp_grouprec); /* * Append as many sources as will fit in the first packet. * If we are appending to a new packet, the chain allocation * may potentially use clusters; use m_getptr() in this case. * If we are appending to an existing packet, we need to obtain * a pointer to the group record after m_append(), in case a new * mbuf was allocated. * Only append sources which are in-mode at t1. If we are * transitioning to MCAST_UNDEFINED state on the group, do not * include source entries. * Only report recorded sources in our filter set when responding * to a group-source query. */ if (record_has_sources) { if (m == m0) { md = m_last(m); pig = (struct igmp_grouprec *)(void *) (mtod(md, uint8_t *) + md->m_len - nbytes); } else { md = m_getptr(m, 0, &off); pig = (struct igmp_grouprec *)(void *) (mtod(md, uint8_t *) + off); } msrcs = 0; RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { #ifdef IGMP_DEBUG char buf[MAX_IPv4_STR_LEN]; inet_ntop_haddr(ims->ims_haddr, buf, sizeof(buf)); IGMP_PRINTF(("%s: visit node %s\n", __func__, buf)); #endif now = ims_get_mode(inm, ims, 1); IGMP_PRINTF(("%s: node is %d\n", __func__, now)); if ((now != mode) || (now == mode && mode == MCAST_UNDEFINED)) { IGMP_PRINTF(("%s: skip node\n", __func__)); continue; } if (is_source_query && ims->ims_stp == 0) { IGMP_PRINTF(("%s: skip unrecorded node\n", __func__)); continue; } IGMP_PRINTF(("%s: append node\n", __func__)); naddr = htonl(ims->ims_haddr); if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { if (m != m0) m_freem(m); IGMP_PRINTF(("%s: m_append() failed.\n", __func__)); return (-ENOMEM); } nbytes += sizeof(in_addr_t); ++msrcs; if (msrcs == m0srcs) break; } IGMP_PRINTF(("%s: msrcs is %d this packet\n", __func__, msrcs)); ig_numsrc = htons(msrcs); bcopy(&ig_numsrc, &pig->ig_numsrc, sizeof (ig_numsrc)); nbytes += (msrcs * sizeof(in_addr_t)); } if (is_source_query && msrcs == 0) { IGMP_PRINTF(("%s: no recorded sources to report\n", __func__)); if (m != m0) m_freem(m); return (0); } /* * We are good to go with first packet. */ if (m != m0) { IGMP_PRINTF(("%s: enqueueing first packet\n", __func__)); m->m_pkthdr.vt_nrecs = 1; IF_ENQUEUE(ifq, m); } else { m->m_pkthdr.vt_nrecs++; } /* * No further work needed if no source list in packet(s). */ if (!record_has_sources) return (nbytes); /* * Whilst sources remain to be announced, we need to allocate * a new packet and fill out as many sources as will fit. * Always try for a cluster first. */ while (nims != NULL) { if (IF_QFULL(ifq)) { IGMP_PRINTF(("%s: outbound queue full\n", __func__)); return (-ENOMEM); } m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); if (m) m->m_data += IGMP_LEADINGSPACE; if (m == NULL) { m = m_gethdr(M_DONTWAIT, MT_DATA); if (m) MH_ALIGN(m, IGMP_LEADINGSPACE); } if (m == NULL) return (-ENOMEM); igmp_save_context(m, ifp); md = m_getptr(m, 0, &off); pig = (struct igmp_grouprec *)(void *) (mtod(md, uint8_t *) + off); IGMP_PRINTF(("%s: allocated next packet\n", __func__)); if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { if (m != m0) m_freem(m); IGMP_PRINTF(("%s: m_append() failed.\n", __func__)); return (-ENOMEM); } m->m_pkthdr.vt_nrecs = 1; nbytes += sizeof(struct igmp_grouprec); m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); msrcs = 0; RB_FOREACH_FROM(ims, ip_msource_tree, nims) { #ifdef IGMP_DEBUG char buf[MAX_IPv4_STR_LEN]; inet_ntop_haddr(ims->ims_haddr, buf, sizeof(buf)); IGMP_PRINTF(("%s: visit node %s\n", __func__, buf)); #endif now = ims_get_mode(inm, ims, 1); if ((now != mode) || (now == mode && mode == MCAST_UNDEFINED)) { IGMP_PRINTF(("%s: skip node\n", __func__)); continue; } if (is_source_query && ims->ims_stp == 0) { IGMP_PRINTF(("%s: skip unrecorded node\n", __func__)); continue; } IGMP_PRINTF(("%s: append node\n", __func__)); naddr = htonl(ims->ims_haddr); if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { if (m != m0) m_freem(m); IGMP_PRINTF(("%s: m_append() failed.\n", __func__)); return (-ENOMEM); } ++msrcs; if (msrcs == m0srcs) break; } ig_numsrc = htons(msrcs); bcopy(&ig_numsrc, &pig->ig_numsrc, sizeof (ig_numsrc)); nbytes += (msrcs * sizeof(in_addr_t)); IGMP_PRINTF(("%s: enqueueing next packet\n", __func__)); IF_ENQUEUE(ifq, m); } return (nbytes); } /* * Type used to mark record pass completion. * We exploit the fact we can cast to this easily from the * current filter modes on each ip_msource node. */ typedef enum { REC_NONE = 0x00, /* MCAST_UNDEFINED */ REC_ALLOW = 0x01, /* MCAST_INCLUDE */ REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ REC_FULL = REC_ALLOW | REC_BLOCK } rectype_t; /* * Enqueue an IGMPv3 filter list change to the given output queue. * * Source list filter state is held in an RB-tree. When the filter list * for a group is changed without changing its mode, we need to compute * the deltas between T0 and T1 for each source in the filter set, * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. * * As we may potentially queue two record types, and the entire R-B tree * needs to be walked at once, we break this out into its own function * so we can generate a tightly packed queue of packets. * * XXX This could be written to only use one tree walk, although that makes * serializing into the mbuf chains a bit harder. For now we do two walks * which makes things easier on us, and it may or may not be harder on * the L2 cache. * * If successful the size of all data appended to the queue is returned, * otherwise an error code less than zero is returned, or zero if * no record(s) were appended. */ static int igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm) { static const int MINRECLEN = sizeof(struct igmp_grouprec) + sizeof(in_addr_t); struct ifnet *ifp; struct igmp_grouprec ig; struct igmp_grouprec *pig; struct ip_msource *ims, *nims; struct mbuf *m, *m0, *md; in_addr_t naddr; int m0srcs, nbytes, npbytes, off, rsrcs, schanged; int nallow, nblock; uint8_t mode, now, then; rectype_t crt, drt, nrt; u_int16_t ig_numsrc; INM_LOCK_ASSERT_HELD(inm); if (inm->inm_nsrc == 0 || (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) return (0); ifp = inm->inm_ifp; /* interface */ mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ crt = REC_NONE; /* current group record type */ drt = REC_NONE; /* mask of completed group record types */ nrt = REC_NONE; /* record type for current node */ m0srcs = 0; /* # source which will fit in current mbuf chain */ nbytes = 0; /* # of bytes appended to group's state-change queue */ npbytes = 0; /* # of bytes appended this packet */ rsrcs = 0; /* # sources encoded in current record */ schanged = 0; /* # nodes encoded in overall filter change */ nallow = 0; /* # of source entries in ALLOW_NEW */ nblock = 0; /* # of source entries in BLOCK_OLD */ nims = NULL; /* next tree node pointer */ /* * For each possible filter record mode. * The first kind of source we encounter tells us which * is the first kind of record we start appending. * If a node transitioned to UNDEFINED at t1, its mode is treated * as the inverse of the group's filter mode. */ while (drt != REC_FULL) { do { m0 = ifq->ifq_tail; if (m0 != NULL && (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && (m0->m_pkthdr.len + MINRECLEN) < (ifp->if_mtu - IGMP_LEADINGSPACE)) { m = m0; m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); IGMP_PRINTF(("%s: use previous packet\n", __func__)); } else { m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); if (m) m->m_data += IGMP_LEADINGSPACE; if (m == NULL) { m = m_gethdr(M_DONTWAIT, MT_DATA); if (m) MH_ALIGN(m, IGMP_LEADINGSPACE); } if (m == NULL) { IGMP_PRINTF(("%s: m_get*() failed\n", __func__)); return (-ENOMEM); } m->m_pkthdr.vt_nrecs = 0; igmp_save_context(m, ifp); m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); npbytes = 0; IGMP_PRINTF(("%s: allocated new packet\n", __func__)); } /* * Append the IGMP group record header to the * current packet's data area. * Recalculate pointer to free space for next * group record, in case m_append() allocated * a new mbuf or cluster. */ memset(&ig, 0, sizeof(ig)); ig.ig_group = inm->inm_addr; if (!m_append(m, sizeof(ig), (void *)&ig)) { if (m != m0) m_freem(m); IGMP_PRINTF(("%s: m_append() failed\n", __func__)); return (-ENOMEM); } npbytes += sizeof(struct igmp_grouprec); if (m != m0) { /* new packet; offset in c hain */ md = m_getptr(m, npbytes - sizeof(struct igmp_grouprec), &off); pig = (struct igmp_grouprec *)(void *)(mtod(md, uint8_t *) + off); } else { /* current packet; offset from last append */ md = m_last(m); pig = (struct igmp_grouprec *)(void *)(mtod(md, uint8_t *) + md->m_len - sizeof(struct igmp_grouprec)); } /* * Begin walking the tree for this record type * pass, or continue from where we left off * previously if we had to allocate a new packet. * Only report deltas in-mode at t1. * We need not report included sources as allowed * if we are in inclusive mode on the group, * however the converse is not true. */ rsrcs = 0; if (nims == NULL) nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); RB_FOREACH_FROM(ims, ip_msource_tree, nims) { #ifdef IGMP_DEBUG char buf[MAX_IPv4_STR_LEN]; inet_ntop_haddr(ims->ims_haddr, buf, sizeof(buf)); IGMP_PRINTF(("%s: visit node %s\n", __func__, buf)); #endif now = ims_get_mode(inm, ims, 1); then = ims_get_mode(inm, ims, 0); IGMP_PRINTF(("%s: mode: t0 %d, t1 %d\n", __func__, then, now)); if (now == then) { IGMP_PRINTF(("%s: skip unchanged\n", __func__)); continue; } if (mode == MCAST_EXCLUDE && now == MCAST_INCLUDE) { IGMP_PRINTF(("%s: skip IN src on EX " "group\n", __func__)); continue; } nrt = (rectype_t)now; if (nrt == REC_NONE) nrt = (rectype_t)(~mode & REC_FULL); if (schanged++ == 0) { crt = nrt; } else if (crt != nrt) continue; naddr = htonl(ims->ims_haddr); if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { if (m != m0) m_freem(m); IGMP_PRINTF(("%s: m_append() failed\n", __func__)); return (-ENOMEM); } nallow += !!(crt == REC_ALLOW); nblock += !!(crt == REC_BLOCK); if (++rsrcs == m0srcs) break; } /* * If we did not append any tree nodes on this * pass, back out of allocations. */ if (rsrcs == 0) { npbytes -= sizeof(struct igmp_grouprec); if (m != m0) { IGMP_PRINTF(("%s: m_free(m)\n", __func__)); m_freem(m); } else { IGMP_PRINTF(("%s: m_adj(m, -ig)\n", __func__)); m_adj(m, -((int)sizeof( struct igmp_grouprec))); } continue; } npbytes += (rsrcs * sizeof(in_addr_t)); if (crt == REC_ALLOW) pig->ig_type = IGMP_ALLOW_NEW_SOURCES; else if (crt == REC_BLOCK) pig->ig_type = IGMP_BLOCK_OLD_SOURCES; ig_numsrc = htons(rsrcs); bcopy(&ig_numsrc, &pig->ig_numsrc, sizeof (ig_numsrc)); /* * Count the new group record, and enqueue this * packet if it wasn't already queued. */ m->m_pkthdr.vt_nrecs++; if (m != m0) IF_ENQUEUE(ifq, m); nbytes += npbytes; } while (nims != NULL); drt |= crt; crt = (~crt & REC_FULL); } IGMP_PRINTF(("%s: queued %d ALLOW_NEW, %d BLOCK_OLD\n", __func__, nallow, nblock)); return (nbytes); } static int igmp_v3_merge_state_changes(struct in_multi *inm, struct ifqueue *ifscq) { struct ifqueue *gq; struct mbuf *m; /* pending state-change */ struct mbuf *m0; /* copy of pending state-change */ struct mbuf *mt; /* last state-change in packet */ struct mbuf *n; int docopy, domerge; u_int recslen; INM_LOCK_ASSERT_HELD(inm); docopy = 0; domerge = 0; recslen = 0; /* * If there are further pending retransmissions, make a writable * copy of each queued state-change message before merging. */ if (inm->inm_scrv > 0) docopy = 1; gq = &inm->inm_scq; #ifdef IGMP_DEBUG if (gq->ifq_head == NULL) { IGMP_PRINTF(("%s: WARNING: queue for inm 0x%llx is empty\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(inm))); } #endif /* * Use IF_REMQUEUE() instead of IF_DEQUEUE() below, since the * packet might not always be at the head of the ifqueue. */ m = gq->ifq_head; while (m != NULL) { /* * Only merge the report into the current packet if * there is sufficient space to do so; an IGMPv3 report * packet may only contain 65,535 group records. * Always use a simple mbuf chain concatentation to do this, * as large state changes for single groups may have * allocated clusters. */ domerge = 0; mt = ifscq->ifq_tail; if (mt != NULL) { recslen = m_length(m); if ((mt->m_pkthdr.vt_nrecs + m->m_pkthdr.vt_nrecs <= IGMP_V3_REPORT_MAXRECS) && (mt->m_pkthdr.len + recslen <= (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) domerge = 1; } if (!domerge && IF_QFULL(gq)) { IGMP_PRINTF(("%s: outbound queue full, skipping whole " "packet 0x%llx\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m))); n = m->m_nextpkt; if (!docopy) { IF_REMQUEUE(gq, m); m_freem(m); } m = n; continue; } if (!docopy) { IGMP_PRINTF(("%s: dequeueing 0x%llx\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m))); n = m->m_nextpkt; IF_REMQUEUE(gq, m); m0 = m; m = n; } else { IGMP_PRINTF(("%s: copying 0x%llx\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m))); m0 = m_dup(m, M_NOWAIT); if (m0 == NULL) return (ENOMEM); m0->m_nextpkt = NULL; m = m->m_nextpkt; } if (!domerge) { IGMP_PRINTF(("%s: queueing 0x%llx to ifscq 0x%llx)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m0), (uint64_t)VM_KERNEL_ADDRPERM(ifscq))); IF_ENQUEUE(ifscq, m0); } else { struct mbuf *mtl; /* last mbuf of packet mt */ IGMP_PRINTF(("%s: merging 0x%llx with ifscq tail " "0x%llx)\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m0), (uint64_t)VM_KERNEL_ADDRPERM(mt))); mtl = m_last(mt); m0->m_flags &= ~M_PKTHDR; mt->m_pkthdr.len += recslen; mt->m_pkthdr.vt_nrecs += m0->m_pkthdr.vt_nrecs; mtl->m_next = m0; } } return (0); } /* * Respond to a pending IGMPv3 General Query. */ static uint32_t igmp_v3_dispatch_general_query(struct igmp_ifinfo *igi) { struct ifnet *ifp; struct in_multi *inm; struct in_multistep step; int retval, loop; IGI_LOCK_ASSERT_HELD(igi); VERIFY(igi->igi_version == IGMP_VERSION_3); ifp = igi->igi_ifp; IGI_UNLOCK(igi); in_multihead_lock_shared(); IN_FIRST_MULTI(step, inm); while (inm != NULL) { INM_LOCK(inm); if (inm->inm_ifp != ifp) goto next; switch (inm->inm_state) { case IGMP_NOT_MEMBER: case IGMP_SILENT_MEMBER: break; case IGMP_REPORTING_MEMBER: case IGMP_IDLE_MEMBER: case IGMP_LAZY_MEMBER: case IGMP_SLEEPING_MEMBER: case IGMP_AWAKENING_MEMBER: inm->inm_state = IGMP_REPORTING_MEMBER; IGI_LOCK(igi); retval = igmp_v3_enqueue_group_record(&igi->igi_gq, inm, 0, 0, 0); IGI_UNLOCK(igi); IGMP_PRINTF(("%s: enqueue record = %d\n", __func__, retval)); break; case IGMP_G_QUERY_PENDING_MEMBER: case IGMP_SG_QUERY_PENDING_MEMBER: case IGMP_LEAVING_MEMBER: break; } next: INM_UNLOCK(inm); IN_NEXT_MULTI(step, inm); } in_multihead_lock_done(); IGI_LOCK(igi); loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; igmp_dispatch_queue(igi, &igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); IGI_LOCK_ASSERT_HELD(igi); /* * Slew transmission of bursts over 1 second intervals. */ if (igi->igi_gq.ifq_head != NULL) { igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( IGMP_RESPONSE_BURST_INTERVAL); } return (igi->igi_v3_timer); } /* * Transmit the next pending IGMP message in the output queue. * * Must not be called with inm_lock or igi_lock held. */ static void igmp_sendpkt(struct mbuf *m) { struct ip_moptions *imo; struct mbuf *ipopts, *m0; int error; struct route ro; struct ifnet *ifp; IGMP_PRINTF(("%s: transmit 0x%llx\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m))); ifp = igmp_restore_context(m); /* * Check if the ifnet is still attached. */ if (ifp == NULL || !ifnet_is_attached(ifp, 0)) { IGMP_PRINTF(("%s: dropped 0x%llx as ifp went away.\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m))); m_freem(m); OSAddAtomic(1, &ipstat.ips_noroute); return; } ipopts = igmp_sendra ? m_raopt : NULL; imo = ip_allocmoptions(M_WAITOK); if (imo == NULL) { m_freem(m); return; } imo->imo_multicast_ttl = 1; imo->imo_multicast_vif = -1; imo->imo_multicast_loop = 0; /* * If the user requested that IGMP traffic be explicitly * redirected to the loopback interface (e.g. they are running a * MANET interface and the routing protocol needs to see the * updates), handle this now. */ if (m->m_flags & M_IGMP_LOOP) imo->imo_multicast_ifp = lo_ifp; else imo->imo_multicast_ifp = ifp; if (m->m_flags & M_IGMPV2) { m0 = m; } else { m0 = igmp_v3_encap_report(ifp, m); if (m0 == NULL) { /* * If igmp_v3_encap_report() failed, then M_PREPEND() * already freed the original mbuf chain. * This means that we don't have to m_freem(m) here. */ IGMP_PRINTF(("%s: dropped 0x%llx\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m))); IMO_REMREF(imo); atomic_add_32(&ipstat.ips_odropped, 1); return; } } igmp_scrub_context(m0); m->m_flags &= ~(M_PROTOFLAGS | M_IGMP_LOOP); m0->m_pkthdr.rcvif = lo_ifp; #ifdef MAC mac_netinet_igmp_send(ifp, m0); #endif if (ifp->if_eflags & IFEF_TXSTART) { /* * Use control service class if the interface supports * transmit-start model. */ (void) m_set_service_class(m0, MBUF_SC_CTL); } bzero(&ro, sizeof (ro)); error = ip_output(m0, ipopts, &ro, 0, imo, NULL); ROUTE_RELEASE(&ro); IMO_REMREF(imo); if (error) { IGMP_PRINTF(("%s: ip_output(0x%llx) = %d\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m0), error)); return; } IGMPSTAT_INC(igps_snd_reports); OIGMPSTAT_INC(igps_snd_reports); } /* * Encapsulate an IGMPv3 report. * * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf * chain has already had its IP/IGMPv3 header prepended. In this case * the function will not attempt to prepend; the lengths and checksums * will however be re-computed. * * Returns a pointer to the new mbuf chain head, or NULL if the * allocation failed. */ static struct mbuf * igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) { struct igmp_report *igmp; struct ip *ip; int hdrlen, igmpreclen; VERIFY((m->m_flags & M_PKTHDR)); igmpreclen = m_length(m); hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); if (m->m_flags & M_IGMPV3_HDR) { igmpreclen -= hdrlen; } else { M_PREPEND(m, hdrlen, M_DONTWAIT); if (m == NULL) return (NULL); m->m_flags |= M_IGMPV3_HDR; } IGMP_PRINTF(("%s: igmpreclen is %d\n", __func__, igmpreclen)); m->m_data += sizeof(struct ip); m->m_len -= sizeof(struct ip); igmp = mtod(m, struct igmp_report *); igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; igmp->ir_rsv1 = 0; igmp->ir_rsv2 = 0; igmp->ir_numgrps = htons(m->m_pkthdr.vt_nrecs); igmp->ir_cksum = 0; igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); m->m_pkthdr.vt_nrecs = 0; m->m_data -= sizeof(struct ip); m->m_len += sizeof(struct ip); ip = mtod(m, struct ip *); ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; ip->ip_len = hdrlen + igmpreclen; ip->ip_off = IP_DF; ip->ip_p = IPPROTO_IGMP; ip->ip_sum = 0; ip->ip_src.s_addr = INADDR_ANY; if (m->m_flags & M_IGMP_LOOP) { struct in_ifaddr *ia; IFP_TO_IA(ifp, ia); if (ia != NULL) { IFA_LOCK(&ia->ia_ifa); ip->ip_src = ia->ia_addr.sin_addr; IFA_UNLOCK(&ia->ia_ifa); IFA_REMREF(&ia->ia_ifa); } } ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); return (m); } #ifdef IGMP_DEBUG static const char * igmp_rec_type_to_str(const int type) { switch (type) { case IGMP_CHANGE_TO_EXCLUDE_MODE: return "TO_EX"; break; case IGMP_CHANGE_TO_INCLUDE_MODE: return "TO_IN"; break; case IGMP_MODE_IS_EXCLUDE: return "MODE_EX"; break; case IGMP_MODE_IS_INCLUDE: return "MODE_IN"; break; case IGMP_ALLOW_NEW_SOURCES: return "ALLOW_NEW"; break; case IGMP_BLOCK_OLD_SOURCES: return "BLOCK_OLD"; break; default: break; } return "unknown"; } #endif void igmp_init(struct protosw *pp, struct domain *dp) { #pragma unused(dp) static int igmp_initialized = 0; VERIFY((pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED); if (igmp_initialized) return; igmp_initialized = 1; IGMP_PRINTF(("%s: initializing\n", __func__)); igmp_timers_are_running = 0; /* Setup lock group and attribute for igmp_mtx */ igmp_mtx_grp_attr = lck_grp_attr_alloc_init(); igmp_mtx_grp = lck_grp_alloc_init("igmp_mtx", igmp_mtx_grp_attr); igmp_mtx_attr = lck_attr_alloc_init(); lck_mtx_init(&igmp_mtx, igmp_mtx_grp, igmp_mtx_attr); LIST_INIT(&igi_head); m_raopt = igmp_ra_alloc(); igi_size = sizeof (struct igmp_ifinfo); igi_zone = zinit(igi_size, IGI_ZONE_MAX * igi_size, 0, IGI_ZONE_NAME); if (igi_zone == NULL) { panic("%s: failed allocating %s", __func__, IGI_ZONE_NAME); /* NOTREACHED */ } zone_change(igi_zone, Z_EXPAND, TRUE); zone_change(igi_zone, Z_CALLERACCT, FALSE); }