3265 lines
86 KiB
C
3265 lines
86 KiB
C
/*-
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* Copyright (c) 2009 Bruce Simpson.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $
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*/
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/*-
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* Copyright (c) 1988 Stephen Deering.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Stephen Deering of Stanford University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)igmp.c 8.1 (Berkeley) 7/19/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/sysctl.h>
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#include <sys/kernel.h>
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#include <sys/callout.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/ktr.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/mld6.h>
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#include <netinet6/mld6_var.h>
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#include <security/mac/mac_framework.h>
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#ifndef KTR_MLD
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#define KTR_MLD KTR_INET6
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#endif
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static struct mld_ifinfo *
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mli_alloc_locked(struct ifnet *);
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static void mli_delete_locked(const struct ifnet *);
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static void mld_dispatch_packet(struct mbuf *);
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static void mld_dispatch_queue(struct ifqueue *, int);
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static void mld_final_leave(struct in6_multi *, struct mld_ifinfo *);
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static void mld_fasttimo_vnet(void);
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static int mld_handle_state_change(struct in6_multi *,
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struct mld_ifinfo *);
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static int mld_initial_join(struct in6_multi *, struct mld_ifinfo *,
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const int);
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#ifdef KTR
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static char * mld_rec_type_to_str(const int);
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#endif
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static void mld_set_version(struct mld_ifinfo *, const int);
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static void mld_slowtimo_vnet(void);
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static int mld_v1_input_query(struct ifnet *, const struct ip6_hdr *,
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/*const*/ struct mld_hdr *);
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static int mld_v1_input_report(struct ifnet *, const struct ip6_hdr *,
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/*const*/ struct mld_hdr *);
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static void mld_v1_process_group_timer(struct in6_multi *, const int);
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static void mld_v1_process_querier_timers(struct mld_ifinfo *);
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static int mld_v1_transmit_report(struct in6_multi *, const int);
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static void mld_v1_update_group(struct in6_multi *, const int);
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static void mld_v2_cancel_link_timers(struct mld_ifinfo *);
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static void mld_v2_dispatch_general_query(struct mld_ifinfo *);
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static struct mbuf *
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mld_v2_encap_report(struct ifnet *, struct mbuf *);
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static int mld_v2_enqueue_filter_change(struct ifqueue *,
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struct in6_multi *);
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static int mld_v2_enqueue_group_record(struct ifqueue *,
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struct in6_multi *, const int, const int, const int);
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static int mld_v2_input_query(struct ifnet *, const struct ip6_hdr *,
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struct mbuf *, const int, const int);
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static int mld_v2_merge_state_changes(struct in6_multi *,
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struct ifqueue *);
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static void mld_v2_process_group_timers(struct mld_ifinfo *,
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struct ifqueue *, struct ifqueue *,
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struct in6_multi *, const int);
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static int mld_v2_process_group_query(struct in6_multi *,
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struct mld_ifinfo *mli, int, struct mbuf *, const int);
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static int sysctl_mld_gsr(SYSCTL_HANDLER_ARGS);
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static int sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS);
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/*
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* Normative references: RFC 2710, RFC 3590, RFC 3810.
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*
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* Locking:
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* * The MLD subsystem lock ends up being system-wide for the moment,
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* but could be per-VIMAGE later on.
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* * The permitted lock order is: IN6_MULTI_LOCK, MLD_LOCK, IF_ADDR_LOCK.
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* Any may be taken independently; if any are held at the same
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* time, the above lock order must be followed.
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* * IN6_MULTI_LOCK covers in_multi.
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* * MLD_LOCK covers per-link state and any global variables in this file.
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* * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of
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* per-link state iterators.
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*
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* XXX LOR PREVENTION
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* A special case for IPv6 is the in6_setscope() routine. ip6_output()
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* will not accept an ifp; it wants an embedded scope ID, unlike
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* ip_output(), which happily takes the ifp given to it. The embedded
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* scope ID is only used by MLD to select the outgoing interface.
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*
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* During interface attach and detach, MLD will take MLD_LOCK *after*
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* the IF_AFDATA_LOCK.
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* As in6_setscope() takes IF_AFDATA_LOCK then SCOPE_LOCK, we can't call
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* it with MLD_LOCK held without triggering an LOR. A netisr with indirect
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* dispatch could work around this, but we'd rather not do that, as it
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* can introduce other races.
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*
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* As such, we exploit the fact that the scope ID is just the interface
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* index, and embed it in the IPv6 destination address accordingly.
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* This is potentially NOT VALID for MLDv1 reports, as they
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* are always sent to the multicast group itself; as MLDv2
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* reports are always sent to ff02::16, this is not an issue
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* when MLDv2 is in use.
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*
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* This does not however eliminate the LOR when ip6_output() itself
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* calls in6_setscope() internally whilst MLD_LOCK is held. This will
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* trigger a LOR warning in WITNESS when the ifnet is detached.
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*
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* The right answer is probably to make IF_AFDATA_LOCK an rwlock, given
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* how it's used across the network stack. Here we're simply exploiting
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* the fact that MLD runs at a similar layer in the stack to scope6.c.
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*
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* VIMAGE:
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* * Each in6_multi corresponds to an ifp, and each ifp corresponds
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* to a vnet in ifp->if_vnet.
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*/
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static struct mtx mld_mtx;
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MALLOC_DEFINE(M_MLD, "mld", "mld state");
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#define MLD_EMBEDSCOPE(pin6, zoneid) \
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(pin6)->s6_addr16[1] = htons((zoneid) & 0xFFFF)
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/*
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* VIMAGE-wide globals.
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*/
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static VNET_DEFINE(struct timeval, mld_gsrdelay) = {10, 0};
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static VNET_DEFINE(LIST_HEAD(, mld_ifinfo), mli_head);
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static VNET_DEFINE(int, interface_timers_running6);
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static VNET_DEFINE(int, state_change_timers_running6);
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static VNET_DEFINE(int, current_state_timers_running6);
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#define V_mld_gsrdelay VNET(mld_gsrdelay)
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#define V_mli_head VNET(mli_head)
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#define V_interface_timers_running6 VNET(interface_timers_running6)
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#define V_state_change_timers_running6 VNET(state_change_timers_running6)
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#define V_current_state_timers_running6 VNET(current_state_timers_running6)
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SYSCTL_DECL(_net_inet6); /* Note: Not in any common header. */
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SYSCTL_NODE(_net_inet6, OID_AUTO, mld, CTLFLAG_RW, 0,
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"IPv6 Multicast Listener Discovery");
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/*
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* Virtualized sysctls.
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*/
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SYSCTL_VNET_PROC(_net_inet6_mld, OID_AUTO, gsrdelay,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
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&VNET_NAME(mld_gsrdelay.tv_sec), 0, sysctl_mld_gsr, "I",
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"Rate limit for MLDv2 Group-and-Source queries in seconds");
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/*
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* Non-virtualized sysctls.
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*/
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SYSCTL_NODE(_net_inet6_mld, OID_AUTO, ifinfo, CTLFLAG_RD | CTLFLAG_MPSAFE,
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sysctl_mld_ifinfo, "Per-interface MLDv2 state");
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static int mld_v1enable = 1;
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SYSCTL_INT(_net_inet6_mld, OID_AUTO, v1enable, CTLFLAG_RW,
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&mld_v1enable, 0, "Enable fallback to MLDv1");
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TUNABLE_INT("net.inet6.mld.v1enable", &mld_v1enable);
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/*
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* Packed Router Alert option structure declaration.
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*/
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struct mld_raopt {
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struct ip6_hbh hbh;
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struct ip6_opt pad;
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struct ip6_opt_router ra;
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} __packed;
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/*
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* Router Alert hop-by-hop option header.
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*/
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static struct mld_raopt mld_ra = {
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.hbh = { 0, 0 },
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.pad = { .ip6o_type = IP6OPT_PADN, 0 },
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.ra = {
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.ip6or_type = IP6OPT_ROUTER_ALERT,
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.ip6or_len = IP6OPT_RTALERT_LEN - 2,
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.ip6or_value[0] = ((IP6OPT_RTALERT_MLD >> 8) & 0xFF),
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.ip6or_value[1] = (IP6OPT_RTALERT_MLD & 0xFF)
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}
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};
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static struct ip6_pktopts mld_po;
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static __inline void
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mld_save_context(struct mbuf *m, struct ifnet *ifp)
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{
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#ifdef VIMAGE
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m->m_pkthdr.header = ifp->if_vnet;
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#endif /* VIMAGE */
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m->m_pkthdr.flowid = ifp->if_index;
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}
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static __inline void
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mld_scrub_context(struct mbuf *m)
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{
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m->m_pkthdr.header = NULL;
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m->m_pkthdr.flowid = 0;
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}
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/*
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* Restore context from a queued output chain.
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* Return saved ifindex.
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*
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* VIMAGE: The assertion is there to make sure that we
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* actually called CURVNET_SET() with what's in the mbuf chain.
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*/
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static __inline uint32_t
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mld_restore_context(struct mbuf *m)
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{
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#if defined(VIMAGE) && defined(INVARIANTS)
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KASSERT(curvnet == m->m_pkthdr.header,
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("%s: called when curvnet was not restored", __func__));
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#endif
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return (m->m_pkthdr.flowid);
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}
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/*
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* Retrieve or set threshold between group-source queries in seconds.
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*
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* VIMAGE: Assume curvnet set by caller.
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* SMPng: NOTE: Serialized by MLD lock.
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*/
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static int
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sysctl_mld_gsr(SYSCTL_HANDLER_ARGS)
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{
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int error;
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int i;
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error = sysctl_wire_old_buffer(req, sizeof(int));
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if (error)
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return (error);
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MLD_LOCK();
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i = V_mld_gsrdelay.tv_sec;
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error = sysctl_handle_int(oidp, &i, 0, req);
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if (error || !req->newptr)
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goto out_locked;
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if (i < -1 || i >= 60) {
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error = EINVAL;
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goto out_locked;
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}
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CTR2(KTR_MLD, "change mld_gsrdelay from %d to %d",
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V_mld_gsrdelay.tv_sec, i);
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V_mld_gsrdelay.tv_sec = i;
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out_locked:
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MLD_UNLOCK();
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return (error);
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}
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/*
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* Expose struct mld_ifinfo to userland, keyed by ifindex.
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* For use by ifmcstat(8).
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*
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* SMPng: NOTE: Does an unlocked ifindex space read.
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* VIMAGE: Assume curvnet set by caller. The node handler itself
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* is not directly virtualized.
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*/
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static int
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sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS)
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{
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int *name;
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int error;
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u_int namelen;
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struct ifnet *ifp;
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struct mld_ifinfo *mli;
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name = (int *)arg1;
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namelen = arg2;
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if (req->newptr != NULL)
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return (EPERM);
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if (namelen != 1)
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return (EINVAL);
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error = sysctl_wire_old_buffer(req, sizeof(struct mld_ifinfo));
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if (error)
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return (error);
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IN6_MULTI_LOCK();
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MLD_LOCK();
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if (name[0] <= 0 || name[0] > V_if_index) {
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error = ENOENT;
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goto out_locked;
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}
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error = ENOENT;
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ifp = ifnet_byindex(name[0]);
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if (ifp == NULL)
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goto out_locked;
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LIST_FOREACH(mli, &V_mli_head, mli_link) {
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if (ifp == mli->mli_ifp) {
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error = SYSCTL_OUT(req, mli,
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sizeof(struct mld_ifinfo));
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break;
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}
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}
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out_locked:
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MLD_UNLOCK();
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IN6_MULTI_UNLOCK();
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return (error);
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}
|
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|
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/*
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* Dispatch an entire queue of pending packet chains.
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* VIMAGE: Assumes the vnet pointer has been set.
|
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*/
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static void
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mld_dispatch_queue(struct ifqueue *ifq, int limit)
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{
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struct mbuf *m;
|
|
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for (;;) {
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_IF_DEQUEUE(ifq, m);
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if (m == NULL)
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break;
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CTR3(KTR_MLD, "%s: dispatch %p from %p", __func__, ifq, m);
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mld_dispatch_packet(m);
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if (--limit == 0)
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break;
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}
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}
|
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|
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/*
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* Filter outgoing MLD report state by group.
|
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*
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* Reports are ALWAYS suppressed for ALL-HOSTS (ff02::1)
|
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* and node-local addresses. However, kernel and socket consumers
|
|
* always embed the KAME scope ID in the address provided, so strip it
|
|
* when performing comparison.
|
|
* Note: This is not the same as the *multicast* scope.
|
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*
|
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* Return zero if the given group is one for which MLD reports
|
|
* should be suppressed, or non-zero if reports should be issued.
|
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*/
|
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static __inline int
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mld_is_addr_reported(const struct in6_addr *addr)
|
|
{
|
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|
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KASSERT(IN6_IS_ADDR_MULTICAST(addr), ("%s: not multicast", __func__));
|
|
|
|
if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_NODELOCAL)
|
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return (0);
|
|
|
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if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_LINKLOCAL) {
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struct in6_addr tmp = *addr;
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in6_clearscope(&tmp);
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if (IN6_ARE_ADDR_EQUAL(&tmp, &in6addr_linklocal_allnodes))
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return (0);
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}
|
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|
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return (1);
|
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}
|
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|
|
/*
|
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* Attach MLD when PF_INET6 is attached to an interface.
|
|
*
|
|
* SMPng: Normally called with IF_AFDATA_LOCK held.
|
|
*/
|
|
struct mld_ifinfo *
|
|
mld_domifattach(struct ifnet *ifp)
|
|
{
|
|
struct mld_ifinfo *mli;
|
|
|
|
CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
|
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__func__, ifp, ifp->if_xname);
|
|
|
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MLD_LOCK();
|
|
|
|
mli = mli_alloc_locked(ifp);
|
|
if (!(ifp->if_flags & IFF_MULTICAST))
|
|
mli->mli_flags |= MLIF_SILENT;
|
|
|
|
MLD_UNLOCK();
|
|
|
|
return (mli);
|
|
}
|
|
|
|
/*
|
|
* VIMAGE: assume curvnet set by caller.
|
|
*/
|
|
static struct mld_ifinfo *
|
|
mli_alloc_locked(/*const*/ struct ifnet *ifp)
|
|
{
|
|
struct mld_ifinfo *mli;
|
|
|
|
MLD_LOCK_ASSERT();
|
|
|
|
mli = malloc(sizeof(struct mld_ifinfo), M_MLD, M_NOWAIT|M_ZERO);
|
|
if (mli == NULL)
|
|
goto out;
|
|
|
|
mli->mli_ifp = ifp;
|
|
mli->mli_version = MLD_VERSION_2;
|
|
mli->mli_flags = 0;
|
|
mli->mli_rv = MLD_RV_INIT;
|
|
mli->mli_qi = MLD_QI_INIT;
|
|
mli->mli_qri = MLD_QRI_INIT;
|
|
mli->mli_uri = MLD_URI_INIT;
|
|
|
|
SLIST_INIT(&mli->mli_relinmhead);
|
|
|
|
/*
|
|
* Responses to general queries are subject to bounds.
|
|
*/
|
|
IFQ_SET_MAXLEN(&mli->mli_gq, MLD_MAX_RESPONSE_PACKETS);
|
|
|
|
LIST_INSERT_HEAD(&V_mli_head, mli, mli_link);
|
|
|
|
CTR2(KTR_MLD, "allocate mld_ifinfo for ifp %p(%s)",
|
|
ifp, ifp->if_xname);
|
|
|
|
out:
|
|
return (mli);
|
|
}
|
|
|
|
/*
|
|
* Hook for ifdetach.
|
|
*
|
|
* NOTE: Some finalization tasks need to run before the protocol domain
|
|
* is detached, but also before the link layer does its cleanup.
|
|
* Run before link-layer cleanup; cleanup groups, but do not free MLD state.
|
|
*
|
|
* SMPng: Caller must hold IN6_MULTI_LOCK().
|
|
* Must take IF_ADDR_LOCK() to cover if_multiaddrs iterator.
|
|
* XXX This routine is also bitten by unlocked ifma_protospec access.
|
|
*/
|
|
void
|
|
mld_ifdetach(struct ifnet *ifp)
|
|
{
|
|
struct mld_ifinfo *mli;
|
|
struct ifmultiaddr *ifma;
|
|
struct in6_multi *inm, *tinm;
|
|
|
|
CTR3(KTR_MLD, "%s: called for ifp %p(%s)", __func__, ifp,
|
|
ifp->if_xname);
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK();
|
|
|
|
mli = MLD_IFINFO(ifp);
|
|
if (mli->mli_version == MLD_VERSION_2) {
|
|
IF_ADDR_LOCK(ifp);
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
|
|
if (ifma->ifma_addr->sa_family != AF_INET6 ||
|
|
ifma->ifma_protospec == NULL)
|
|
continue;
|
|
inm = (struct in6_multi *)ifma->ifma_protospec;
|
|
if (inm->in6m_state == MLD_LEAVING_MEMBER) {
|
|
SLIST_INSERT_HEAD(&mli->mli_relinmhead,
|
|
inm, in6m_nrele);
|
|
}
|
|
in6m_clear_recorded(inm);
|
|
}
|
|
IF_ADDR_UNLOCK(ifp);
|
|
SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, in6m_nrele,
|
|
tinm) {
|
|
SLIST_REMOVE_HEAD(&mli->mli_relinmhead, in6m_nrele);
|
|
in6m_release_locked(inm);
|
|
}
|
|
}
|
|
|
|
MLD_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Hook for domifdetach.
|
|
* Runs after link-layer cleanup; free MLD state.
|
|
*
|
|
* SMPng: Normally called with IF_AFDATA_LOCK held.
|
|
*/
|
|
void
|
|
mld_domifdetach(struct ifnet *ifp)
|
|
{
|
|
|
|
CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
|
|
__func__, ifp, ifp->if_xname);
|
|
|
|
MLD_LOCK();
|
|
mli_delete_locked(ifp);
|
|
MLD_UNLOCK();
|
|
}
|
|
|
|
static void
|
|
mli_delete_locked(const struct ifnet *ifp)
|
|
{
|
|
struct mld_ifinfo *mli, *tmli;
|
|
|
|
CTR3(KTR_MLD, "%s: freeing mld_ifinfo for ifp %p(%s)",
|
|
__func__, ifp, ifp->if_xname);
|
|
|
|
MLD_LOCK_ASSERT();
|
|
|
|
LIST_FOREACH_SAFE(mli, &V_mli_head, mli_link, tmli) {
|
|
if (mli->mli_ifp == ifp) {
|
|
/*
|
|
* Free deferred General Query responses.
|
|
*/
|
|
_IF_DRAIN(&mli->mli_gq);
|
|
|
|
LIST_REMOVE(mli, mli_link);
|
|
|
|
KASSERT(SLIST_EMPTY(&mli->mli_relinmhead),
|
|
("%s: there are dangling in_multi references",
|
|
__func__));
|
|
|
|
free(mli, M_MLD);
|
|
return;
|
|
}
|
|
}
|
|
#ifdef INVARIANTS
|
|
panic("%s: mld_ifinfo not found for ifp %p\n", __func__, ifp);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Process a received MLDv1 general or address-specific query.
|
|
* Assumes that the query header has been pulled up to sizeof(mld_hdr).
|
|
*
|
|
* NOTE: Can't be fully const correct as we temporarily embed scope ID in
|
|
* mld_addr. This is OK as we own the mbuf chain.
|
|
*/
|
|
static int
|
|
mld_v1_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
|
|
/*const*/ struct mld_hdr *mld)
|
|
{
|
|
struct ifmultiaddr *ifma;
|
|
struct mld_ifinfo *mli;
|
|
struct in6_multi *inm;
|
|
int is_general_query;
|
|
uint16_t timer;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
is_general_query = 0;
|
|
|
|
if (!mld_v1enable) {
|
|
CTR3(KTR_MLD, "ignore v1 query %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &mld->mld_addr),
|
|
ifp, ifp->if_xname);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* RFC3810 Section 6.2: MLD queries must originate from
|
|
* a router's link-local address.
|
|
*/
|
|
if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
|
|
CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &ip6->ip6_src),
|
|
ifp, ifp->if_xname);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Do address field validation upfront before we accept
|
|
* the query.
|
|
*/
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
|
|
/*
|
|
* MLDv1 General Query.
|
|
* If this was not sent to the all-nodes group, ignore it.
|
|
*/
|
|
struct in6_addr dst;
|
|
|
|
dst = ip6->ip6_dst;
|
|
in6_clearscope(&dst);
|
|
if (!IN6_ARE_ADDR_EQUAL(&dst, &in6addr_linklocal_allnodes))
|
|
return (EINVAL);
|
|
is_general_query = 1;
|
|
} else {
|
|
/*
|
|
* Embed scope ID of receiving interface in MLD query for
|
|
* lookup whilst we don't hold other locks.
|
|
*/
|
|
in6_setscope(&mld->mld_addr, ifp, NULL);
|
|
}
|
|
|
|
IN6_MULTI_LOCK();
|
|
MLD_LOCK();
|
|
IF_ADDR_LOCK(ifp);
|
|
|
|
/*
|
|
* Switch to MLDv1 host compatibility mode.
|
|
*/
|
|
mli = MLD_IFINFO(ifp);
|
|
KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
|
|
mld_set_version(mli, MLD_VERSION_1);
|
|
|
|
timer = (ntohs(mld->mld_maxdelay) * PR_FASTHZ) / MLD_TIMER_SCALE;
|
|
if (timer == 0)
|
|
timer = 1;
|
|
|
|
if (is_general_query) {
|
|
/*
|
|
* For each reporting group joined on this
|
|
* interface, kick the report timer.
|
|
*/
|
|
CTR2(KTR_MLD, "process v1 general query on ifp %p(%s)",
|
|
ifp, ifp->if_xname);
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
|
|
if (ifma->ifma_addr->sa_family != AF_INET6 ||
|
|
ifma->ifma_protospec == NULL)
|
|
continue;
|
|
inm = (struct in6_multi *)ifma->ifma_protospec;
|
|
mld_v1_update_group(inm, timer);
|
|
}
|
|
} else {
|
|
/*
|
|
* MLDv1 Group-Specific Query.
|
|
* If this is a group-specific MLDv1 query, we need only
|
|
* look up the single group to process it.
|
|
*/
|
|
inm = in6m_lookup_locked(ifp, &mld->mld_addr);
|
|
if (inm != NULL) {
|
|
CTR3(KTR_MLD, "process v1 query %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &mld->mld_addr),
|
|
ifp, ifp->if_xname);
|
|
mld_v1_update_group(inm, timer);
|
|
}
|
|
/* XXX Clear embedded scope ID as userland won't expect it. */
|
|
in6_clearscope(&mld->mld_addr);
|
|
}
|
|
|
|
IF_ADDR_UNLOCK(ifp);
|
|
MLD_UNLOCK();
|
|
IN6_MULTI_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Update the report timer on a group in response to an MLDv1 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 MLDv2. 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 MLDv2, the delay per group should be jittered
|
|
* to avoid bursts of MLDv1 reports.
|
|
*/
|
|
static void
|
|
mld_v1_update_group(struct in6_multi *inm, const int timer)
|
|
{
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
CTR4(KTR_MLD, "%s: %s/%s timer=%d", __func__,
|
|
ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname, timer);
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
break;
|
|
case MLD_REPORTING_MEMBER:
|
|
if (inm->in6m_timer != 0 &&
|
|
inm->in6m_timer <= timer) {
|
|
CTR1(KTR_MLD, "%s: REPORTING and timer running, "
|
|
"skipping.", __func__);
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case MLD_SG_QUERY_PENDING_MEMBER:
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
case MLD_LAZY_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
CTR1(KTR_MLD, "%s: ->REPORTING", __func__);
|
|
inm->in6m_state = MLD_REPORTING_MEMBER;
|
|
inm->in6m_timer = MLD_RANDOM_DELAY(timer);
|
|
V_current_state_timers_running6 = 1;
|
|
break;
|
|
case MLD_SLEEPING_MEMBER:
|
|
CTR1(KTR_MLD, "%s: ->AWAKENING", __func__);
|
|
inm->in6m_state = MLD_AWAKENING_MEMBER;
|
|
break;
|
|
case MLD_LEAVING_MEMBER:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process a received MLDv2 general, group-specific or
|
|
* group-and-source-specific query.
|
|
*
|
|
* Assumes that the query header has been pulled up to sizeof(mldv2_query).
|
|
*
|
|
* Return 0 if successful, otherwise an appropriate error code is returned.
|
|
*/
|
|
static int
|
|
mld_v2_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
|
|
struct mbuf *m, const int off, const int icmp6len)
|
|
{
|
|
struct mld_ifinfo *mli;
|
|
struct mldv2_query *mld;
|
|
struct in6_multi *inm;
|
|
uint32_t maxdelay, nsrc, qqi;
|
|
int is_general_query;
|
|
uint16_t timer;
|
|
uint8_t qrv;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
is_general_query = 0;
|
|
|
|
/*
|
|
* RFC3810 Section 6.2: MLD queries must originate from
|
|
* a router's link-local address.
|
|
*/
|
|
if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
|
|
CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &ip6->ip6_src),
|
|
ifp, ifp->if_xname);
|
|
return (0);
|
|
}
|
|
|
|
CTR2(KTR_MLD, "input v2 query on ifp %p(%s)", ifp, ifp->if_xname);
|
|
|
|
mld = (struct mldv2_query *)(mtod(m, uint8_t *) + off);
|
|
|
|
maxdelay = ntohs(mld->mld_maxdelay); /* in 1/10ths of a second */
|
|
if (maxdelay >= 32678) {
|
|
maxdelay = (MLD_MRC_MANT(maxdelay) | 0x1000) <<
|
|
(MLD_MRC_EXP(maxdelay) + 3);
|
|
}
|
|
timer = (maxdelay * PR_FASTHZ) / MLD_TIMER_SCALE;
|
|
if (timer == 0)
|
|
timer = 1;
|
|
|
|
qrv = MLD_QRV(mld->mld_misc);
|
|
if (qrv < 2) {
|
|
CTR3(KTR_MLD, "%s: clamping qrv %d to %d", __func__,
|
|
qrv, MLD_RV_INIT);
|
|
qrv = MLD_RV_INIT;
|
|
}
|
|
|
|
qqi = mld->mld_qqi;
|
|
if (qqi >= 128) {
|
|
qqi = MLD_QQIC_MANT(mld->mld_qqi) <<
|
|
(MLD_QQIC_EXP(mld->mld_qqi) + 3);
|
|
}
|
|
|
|
nsrc = ntohs(mld->mld_numsrc);
|
|
if (nsrc > MLD_MAX_GS_SOURCES)
|
|
return (EMSGSIZE);
|
|
if (icmp6len < sizeof(struct mldv2_query) +
|
|
(nsrc * sizeof(struct in6_addr)))
|
|
return (EMSGSIZE);
|
|
|
|
/*
|
|
* Do further input validation upfront to avoid resetting timers
|
|
* should we need to discard this query.
|
|
*/
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
|
|
/*
|
|
* General Queries SHOULD be directed to ff02::1.
|
|
* A general query with a source list has undefined
|
|
* behaviour; discard it.
|
|
*/
|
|
struct in6_addr dst;
|
|
|
|
dst = ip6->ip6_dst;
|
|
in6_clearscope(&dst);
|
|
if (!IN6_ARE_ADDR_EQUAL(&dst, &in6addr_linklocal_allnodes) ||
|
|
nsrc > 0)
|
|
return (EINVAL);
|
|
is_general_query = 1;
|
|
} else {
|
|
/*
|
|
* Embed scope ID of receiving interface in MLD query for
|
|
* lookup whilst we don't hold other locks (due to KAME
|
|
* locking lameness). We own this mbuf chain just now.
|
|
*/
|
|
in6_setscope(&mld->mld_addr, ifp, NULL);
|
|
}
|
|
|
|
IN6_MULTI_LOCK();
|
|
MLD_LOCK();
|
|
IF_ADDR_LOCK(ifp);
|
|
|
|
mli = MLD_IFINFO(ifp);
|
|
KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
|
|
|
|
/*
|
|
* Discard the v2 query if we're in Compatibility Mode.
|
|
* The RFC is pretty clear that hosts need to stay in MLDv1 mode
|
|
* until the Old Version Querier Present timer expires.
|
|
*/
|
|
if (mli->mli_version != MLD_VERSION_2)
|
|
goto out_locked;
|
|
|
|
mld_set_version(mli, MLD_VERSION_2);
|
|
mli->mli_rv = qrv;
|
|
mli->mli_qi = qqi;
|
|
mli->mli_qri = maxdelay;
|
|
|
|
CTR4(KTR_MLD, "%s: qrv %d qi %d maxdelay %d", __func__, qrv, qqi,
|
|
maxdelay);
|
|
|
|
if (is_general_query) {
|
|
/*
|
|
* MLDv2 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.
|
|
*/
|
|
CTR2(KTR_MLD, "process v2 general query on ifp %p(%s)",
|
|
ifp, ifp->if_xname);
|
|
if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer) {
|
|
mli->mli_v2_timer = MLD_RANDOM_DELAY(timer);
|
|
V_interface_timers_running6 = 1;
|
|
}
|
|
} else {
|
|
/*
|
|
* MLDv2 Group-specific or Group-and-source-specific Query.
|
|
*
|
|
* 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.
|
|
*/
|
|
inm = in6m_lookup_locked(ifp, &mld->mld_addr);
|
|
if (inm == NULL)
|
|
goto out_locked;
|
|
if (nsrc > 0) {
|
|
if (!ratecheck(&inm->in6m_lastgsrtv,
|
|
&V_mld_gsrdelay)) {
|
|
CTR1(KTR_MLD, "%s: GS query throttled.",
|
|
__func__);
|
|
goto out_locked;
|
|
}
|
|
}
|
|
CTR2(KTR_MLD, "process v2 group query on ifp %p(%s)",
|
|
ifp, ifp->if_xname);
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer)
|
|
mld_v2_process_group_query(inm, mli, timer, m, off);
|
|
|
|
/* XXX Clear embedded scope ID as userland won't expect it. */
|
|
in6_clearscope(&mld->mld_addr);
|
|
}
|
|
|
|
out_locked:
|
|
IF_ADDR_UNLOCK(ifp);
|
|
MLD_UNLOCK();
|
|
IN6_MULTI_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Process a recieved MLDv2 group-specific or group-and-source-specific
|
|
* query.
|
|
* Return <0 if any error occured. Currently this is ignored.
|
|
*/
|
|
static int
|
|
mld_v2_process_group_query(struct in6_multi *inm, struct mld_ifinfo *mli,
|
|
int timer, struct mbuf *m0, const int off)
|
|
{
|
|
struct mldv2_query *mld;
|
|
int retval;
|
|
uint16_t nsrc;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
retval = 0;
|
|
mld = (struct mldv2_query *)(mtod(m0, uint8_t *) + off);
|
|
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
case MLD_SLEEPING_MEMBER:
|
|
case MLD_LAZY_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
case MLD_LEAVING_MEMBER:
|
|
return (retval);
|
|
break;
|
|
case MLD_REPORTING_MEMBER:
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_SG_QUERY_PENDING_MEMBER:
|
|
break;
|
|
}
|
|
|
|
nsrc = ntohs(mld->mld_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->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
|
|
inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER) {
|
|
in6m_clear_recorded(inm);
|
|
timer = min(inm->in6m_timer, timer);
|
|
}
|
|
inm->in6m_state = MLD_G_QUERY_PENDING_MEMBER;
|
|
inm->in6m_timer = MLD_RANDOM_DELAY(timer);
|
|
V_current_state_timers_running6 = 1;
|
|
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->in6m_state == MLD_G_QUERY_PENDING_MEMBER) {
|
|
timer = min(inm->in6m_timer, timer);
|
|
inm->in6m_timer = MLD_RANDOM_DELAY(timer);
|
|
V_current_state_timers_running6 = 1;
|
|
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.
|
|
*/
|
|
if (inm->in6m_nsrc > 0) {
|
|
struct mbuf *m;
|
|
uint8_t *sp;
|
|
int i, nrecorded;
|
|
int soff;
|
|
|
|
m = m0;
|
|
soff = off + sizeof(struct mldv2_query);
|
|
nrecorded = 0;
|
|
for (i = 0; i < nsrc; i++) {
|
|
sp = mtod(m, uint8_t *) + soff;
|
|
retval = in6m_record_source(inm,
|
|
(const struct in6_addr *)sp);
|
|
if (retval < 0)
|
|
break;
|
|
nrecorded += retval;
|
|
soff += sizeof(struct in6_addr);
|
|
if (soff >= m->m_len) {
|
|
soff = soff - m->m_len;
|
|
m = m->m_next;
|
|
if (m == NULL)
|
|
break;
|
|
}
|
|
}
|
|
if (nrecorded > 0) {
|
|
CTR1(KTR_MLD,
|
|
"%s: schedule response to SG query", __func__);
|
|
inm->in6m_state = MLD_SG_QUERY_PENDING_MEMBER;
|
|
inm->in6m_timer = MLD_RANDOM_DELAY(timer);
|
|
V_current_state_timers_running6 = 1;
|
|
}
|
|
}
|
|
|
|
return (retval);
|
|
}
|
|
|
|
/*
|
|
* Process a received MLDv1 host membership report.
|
|
* Assumes mld points to mld_hdr in pulled up mbuf chain.
|
|
*
|
|
* NOTE: Can't be fully const correct as we temporarily embed scope ID in
|
|
* mld_addr. This is OK as we own the mbuf chain.
|
|
*/
|
|
static int
|
|
mld_v1_input_report(struct ifnet *ifp, const struct ip6_hdr *ip6,
|
|
/*const*/ struct mld_hdr *mld)
|
|
{
|
|
struct in6_addr src, dst;
|
|
struct in6_ifaddr *ia;
|
|
struct in6_multi *inm;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
if (!mld_v1enable) {
|
|
CTR3(KTR_MLD, "ignore v1 report %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &mld->mld_addr),
|
|
ifp, ifp->if_xname);
|
|
return (0);
|
|
}
|
|
|
|
if (ifp->if_flags & IFF_LOOPBACK)
|
|
return (0);
|
|
|
|
/*
|
|
* MLDv1 reports must originate from a host's link-local address,
|
|
* or the unspecified address (when booting).
|
|
*/
|
|
src = ip6->ip6_src;
|
|
in6_clearscope(&src);
|
|
if (!IN6_IS_SCOPE_LINKLOCAL(&src) && !IN6_IS_ADDR_UNSPECIFIED(&src)) {
|
|
CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &ip6->ip6_src),
|
|
ifp, ifp->if_xname);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* RFC2710 Section 4: MLDv1 reports must pertain to a multicast
|
|
* group, and must be directed to the group itself.
|
|
*/
|
|
dst = ip6->ip6_dst;
|
|
in6_clearscope(&dst);
|
|
if (!IN6_IS_ADDR_MULTICAST(&mld->mld_addr) ||
|
|
!IN6_ARE_ADDR_EQUAL(&mld->mld_addr, &dst)) {
|
|
CTR3(KTR_MLD, "ignore v1 query dst %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &ip6->ip6_dst),
|
|
ifp, ifp->if_xname);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Make sure we don't hear our own membership report, as fast
|
|
* leave requires knowing that we are the only member of a
|
|
* group. Assume we used the link-local address if available,
|
|
* otherwise look for ::.
|
|
*
|
|
* XXX Note that scope ID comparison is needed for the address
|
|
* returned by in6ifa_ifpforlinklocal(), but SHOULD NOT be
|
|
* performed for the on-wire address.
|
|
*/
|
|
ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
|
|
if ((ia && IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, IA6_IN6(ia))) ||
|
|
(ia == NULL && IN6_IS_ADDR_UNSPECIFIED(&src))) {
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
return (0);
|
|
}
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
|
|
CTR3(KTR_MLD, "process v1 report %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &mld->mld_addr), ifp, ifp->if_xname);
|
|
|
|
/*
|
|
* Embed scope ID of receiving interface in MLD query for lookup
|
|
* whilst we don't hold other locks (due to KAME locking lameness).
|
|
*/
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr))
|
|
in6_setscope(&mld->mld_addr, ifp, NULL);
|
|
|
|
IN6_MULTI_LOCK();
|
|
MLD_LOCK();
|
|
IF_ADDR_LOCK(ifp);
|
|
|
|
/*
|
|
* MLDv1 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.
|
|
*/
|
|
inm = in6m_lookup_locked(ifp, &mld->mld_addr);
|
|
if (inm != NULL) {
|
|
struct mld_ifinfo *mli;
|
|
|
|
mli = inm->in6m_mli;
|
|
KASSERT(mli != NULL,
|
|
("%s: no mli for ifp %p", __func__, ifp));
|
|
|
|
/*
|
|
* If we are in MLDv2 host mode, do not allow the
|
|
* other host's MLDv1 report to suppress our reports.
|
|
*/
|
|
if (mli->mli_version == MLD_VERSION_2)
|
|
goto out_locked;
|
|
|
|
inm->in6m_timer = 0;
|
|
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
case MLD_SLEEPING_MEMBER:
|
|
break;
|
|
case MLD_REPORTING_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
CTR3(KTR_MLD,
|
|
"report suppressed for %s on ifp %p(%s)",
|
|
ip6_sprintf(ip6tbuf, &mld->mld_addr),
|
|
ifp, ifp->if_xname);
|
|
case MLD_LAZY_MEMBER:
|
|
inm->in6m_state = MLD_LAZY_MEMBER;
|
|
break;
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_SG_QUERY_PENDING_MEMBER:
|
|
case MLD_LEAVING_MEMBER:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out_locked:
|
|
MLD_UNLOCK();
|
|
IF_ADDR_UNLOCK(ifp);
|
|
IN6_MULTI_UNLOCK();
|
|
|
|
/* XXX Clear embedded scope ID as userland won't expect it. */
|
|
in6_clearscope(&mld->mld_addr);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* MLD input path.
|
|
*
|
|
* Assume query messages which fit in a single ICMPv6 message header
|
|
* have been pulled up.
|
|
* Assume that userland will want to see the message, even if it
|
|
* otherwise fails kernel input validation; do not free it.
|
|
* Pullup may however free the mbuf chain m if it fails.
|
|
*
|
|
* Return IPPROTO_DONE if we freed m. Otherwise, return 0.
|
|
*/
|
|
int
|
|
mld_input(struct mbuf *m, int off, int icmp6len)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ip6_hdr *ip6;
|
|
struct mld_hdr *mld;
|
|
int mldlen;
|
|
|
|
CTR3(KTR_MLD, "%s: called w/mbuf (%p,%d)", __func__, m, off);
|
|
|
|
ifp = m->m_pkthdr.rcvif;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
/* Pullup to appropriate size. */
|
|
mld = (struct mld_hdr *)(mtod(m, uint8_t *) + off);
|
|
if (mld->mld_type == MLD_LISTENER_QUERY &&
|
|
icmp6len >= sizeof(struct mldv2_query)) {
|
|
mldlen = sizeof(struct mldv2_query);
|
|
} else {
|
|
mldlen = sizeof(struct mld_hdr);
|
|
}
|
|
IP6_EXTHDR_GET(mld, struct mld_hdr *, m, off, mldlen);
|
|
if (mld == NULL) {
|
|
ICMP6STAT_INC(icp6s_badlen);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/*
|
|
* Userland needs to see all of this traffic for implementing
|
|
* the endpoint discovery portion of multicast routing.
|
|
*/
|
|
switch (mld->mld_type) {
|
|
case MLD_LISTENER_QUERY:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_mldquery);
|
|
if (icmp6len == sizeof(struct mld_hdr)) {
|
|
if (mld_v1_input_query(ifp, ip6, mld) != 0)
|
|
return (0);
|
|
} else if (icmp6len >= sizeof(struct mldv2_query)) {
|
|
if (mld_v2_input_query(ifp, ip6, m, off,
|
|
icmp6len) != 0)
|
|
return (0);
|
|
}
|
|
break;
|
|
case MLD_LISTENER_REPORT:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
|
|
if (mld_v1_input_report(ifp, ip6, mld) != 0)
|
|
return (0);
|
|
break;
|
|
case MLDV2_LISTENER_REPORT:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
|
|
break;
|
|
case MLD_LISTENER_DONE:
|
|
icmp6_ifstat_inc(ifp, ifs6_in_mlddone);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Fast timeout handler (global).
|
|
* VIMAGE: Timeout handlers are expected to service all vimages.
|
|
*/
|
|
void
|
|
mld_fasttimo(void)
|
|
{
|
|
VNET_ITERATOR_DECL(vnet_iter);
|
|
|
|
VNET_LIST_RLOCK_NOSLEEP();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET(vnet_iter);
|
|
mld_fasttimo_vnet();
|
|
CURVNET_RESTORE();
|
|
}
|
|
VNET_LIST_RUNLOCK_NOSLEEP();
|
|
}
|
|
|
|
/*
|
|
* Fast timeout handler (per-vnet).
|
|
*
|
|
* VIMAGE: Assume caller has set up our curvnet.
|
|
*/
|
|
static void
|
|
mld_fasttimo_vnet(void)
|
|
{
|
|
struct ifqueue scq; /* State-change packets */
|
|
struct ifqueue qrq; /* Query response packets */
|
|
struct ifnet *ifp;
|
|
struct mld_ifinfo *mli;
|
|
struct ifmultiaddr *ifma, *tifma;
|
|
struct in6_multi *inm;
|
|
int uri_fasthz;
|
|
|
|
uri_fasthz = 0;
|
|
|
|
/*
|
|
* Quick check to see if any work needs to be done, in order to
|
|
* minimize the overhead of fasttimo processing.
|
|
* SMPng: XXX Unlocked reads.
|
|
*/
|
|
if (!V_current_state_timers_running6 &&
|
|
!V_interface_timers_running6 &&
|
|
!V_state_change_timers_running6)
|
|
return;
|
|
|
|
IN6_MULTI_LOCK();
|
|
MLD_LOCK();
|
|
|
|
/*
|
|
* MLDv2 General Query response timer processing.
|
|
*/
|
|
if (V_interface_timers_running6) {
|
|
CTR1(KTR_MLD, "%s: interface timers running", __func__);
|
|
|
|
V_interface_timers_running6 = 0;
|
|
LIST_FOREACH(mli, &V_mli_head, mli_link) {
|
|
if (mli->mli_v2_timer == 0) {
|
|
/* Do nothing. */
|
|
} else if (--mli->mli_v2_timer == 0) {
|
|
mld_v2_dispatch_general_query(mli);
|
|
} else {
|
|
V_interface_timers_running6 = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!V_current_state_timers_running6 &&
|
|
!V_state_change_timers_running6)
|
|
goto out_locked;
|
|
|
|
V_current_state_timers_running6 = 0;
|
|
V_state_change_timers_running6 = 0;
|
|
|
|
CTR1(KTR_MLD, "%s: state change timers running", __func__);
|
|
|
|
/*
|
|
* MLD host report and state-change timer processing.
|
|
* Note: Processing a v2 group timer may remove a node.
|
|
*/
|
|
LIST_FOREACH(mli, &V_mli_head, mli_link) {
|
|
ifp = mli->mli_ifp;
|
|
|
|
if (mli->mli_version == MLD_VERSION_2) {
|
|
uri_fasthz = MLD_RANDOM_DELAY(mli->mli_uri *
|
|
PR_FASTHZ);
|
|
|
|
memset(&qrq, 0, sizeof(struct ifqueue));
|
|
IFQ_SET_MAXLEN(&qrq, MLD_MAX_G_GS_PACKETS);
|
|
|
|
memset(&scq, 0, sizeof(struct ifqueue));
|
|
IFQ_SET_MAXLEN(&scq, MLD_MAX_STATE_CHANGE_PACKETS);
|
|
}
|
|
|
|
IF_ADDR_LOCK(ifp);
|
|
TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link,
|
|
tifma) {
|
|
if (ifma->ifma_addr->sa_family != AF_INET6 ||
|
|
ifma->ifma_protospec == NULL)
|
|
continue;
|
|
inm = (struct in6_multi *)ifma->ifma_protospec;
|
|
switch (mli->mli_version) {
|
|
case MLD_VERSION_1:
|
|
/*
|
|
* XXX Drop IF_ADDR lock temporarily to
|
|
* avoid recursion caused by a potential
|
|
* call by in6ifa_ifpforlinklocal().
|
|
* rwlock candidate?
|
|
*/
|
|
IF_ADDR_UNLOCK(ifp);
|
|
mld_v1_process_group_timer(inm,
|
|
mli->mli_version);
|
|
IF_ADDR_LOCK(ifp);
|
|
break;
|
|
case MLD_VERSION_2:
|
|
mld_v2_process_group_timers(mli, &qrq,
|
|
&scq, inm, uri_fasthz);
|
|
break;
|
|
}
|
|
}
|
|
IF_ADDR_UNLOCK(ifp);
|
|
|
|
if (mli->mli_version == MLD_VERSION_2) {
|
|
struct in6_multi *tinm;
|
|
|
|
mld_dispatch_queue(&qrq, 0);
|
|
mld_dispatch_queue(&scq, 0);
|
|
|
|
/*
|
|
* Free the in_multi reference(s) for
|
|
* this lifecycle.
|
|
*/
|
|
SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead,
|
|
in6m_nrele, tinm) {
|
|
SLIST_REMOVE_HEAD(&mli->mli_relinmhead,
|
|
in6m_nrele);
|
|
in6m_release_locked(inm);
|
|
}
|
|
}
|
|
}
|
|
|
|
out_locked:
|
|
MLD_UNLOCK();
|
|
IN6_MULTI_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Update host report group timer.
|
|
* Will update the global pending timer flags.
|
|
*/
|
|
static void
|
|
mld_v1_process_group_timer(struct in6_multi *inm, const int version)
|
|
{
|
|
int report_timer_expired;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
if (inm->in6m_timer == 0) {
|
|
report_timer_expired = 0;
|
|
} else if (--inm->in6m_timer == 0) {
|
|
report_timer_expired = 1;
|
|
} else {
|
|
V_current_state_timers_running6 = 1;
|
|
return;
|
|
}
|
|
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
case MLD_LAZY_MEMBER:
|
|
case MLD_SLEEPING_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
break;
|
|
case MLD_REPORTING_MEMBER:
|
|
if (report_timer_expired) {
|
|
inm->in6m_state = MLD_IDLE_MEMBER;
|
|
(void)mld_v1_transmit_report(inm,
|
|
MLD_LISTENER_REPORT);
|
|
}
|
|
break;
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_SG_QUERY_PENDING_MEMBER:
|
|
case MLD_LEAVING_MEMBER:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update a group's timers for MLDv2.
|
|
* Will update the global pending timer flags.
|
|
* Note: Unlocked read from mli.
|
|
*/
|
|
static void
|
|
mld_v2_process_group_timers(struct mld_ifinfo *mli,
|
|
struct ifqueue *qrq, struct ifqueue *scq,
|
|
struct in6_multi *inm, const int uri_fasthz)
|
|
{
|
|
int query_response_timer_expired;
|
|
int state_change_retransmit_timer_expired;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
query_response_timer_expired = 0;
|
|
state_change_retransmit_timer_expired = 0;
|
|
|
|
/*
|
|
* During a transition from compatibility mode back to MLDv2,
|
|
* 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 slow-timeout path.
|
|
*/
|
|
if (inm->in6m_timer == 0) {
|
|
query_response_timer_expired = 0;
|
|
} else if (--inm->in6m_timer == 0) {
|
|
query_response_timer_expired = 1;
|
|
} else {
|
|
V_current_state_timers_running6 = 1;
|
|
}
|
|
|
|
if (inm->in6m_sctimer == 0) {
|
|
state_change_retransmit_timer_expired = 0;
|
|
} else if (--inm->in6m_sctimer == 0) {
|
|
state_change_retransmit_timer_expired = 1;
|
|
} else {
|
|
V_state_change_timers_running6 = 1;
|
|
}
|
|
|
|
/* We are in fasttimo, so be quick about it. */
|
|
if (!state_change_retransmit_timer_expired &&
|
|
!query_response_timer_expired)
|
|
return;
|
|
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
case MLD_SLEEPING_MEMBER:
|
|
case MLD_LAZY_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
break;
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_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 = mld_v2_enqueue_group_record(qrq, inm, 0, 1,
|
|
(inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER));
|
|
CTR2(KTR_MLD, "%s: enqueue record = %d",
|
|
__func__, retval);
|
|
inm->in6m_state = MLD_REPORTING_MEMBER;
|
|
in6m_clear_recorded(inm);
|
|
}
|
|
/* FALLTHROUGH */
|
|
case MLD_REPORTING_MEMBER:
|
|
case MLD_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->in6m_scrv > 0) {
|
|
inm->in6m_sctimer = uri_fasthz;
|
|
V_state_change_timers_running6 = 1;
|
|
}
|
|
/*
|
|
* 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)mld_v2_merge_state_changes(inm, scq);
|
|
|
|
in6m_commit(inm);
|
|
CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
|
|
ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname);
|
|
|
|
/*
|
|
* If we are leaving the group for good, make sure
|
|
* we release MLD's reference to it.
|
|
* This release must be deferred using a SLIST,
|
|
* as we are called from a loop which traverses
|
|
* the in_ifmultiaddr TAILQ.
|
|
*/
|
|
if (inm->in6m_state == MLD_LEAVING_MEMBER &&
|
|
inm->in6m_scrv == 0) {
|
|
inm->in6m_state = MLD_NOT_MEMBER;
|
|
SLIST_INSERT_HEAD(&mli->mli_relinmhead,
|
|
inm, in6m_nrele);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Switch to a different version on the given interface,
|
|
* as per Section 9.12.
|
|
*/
|
|
static void
|
|
mld_set_version(struct mld_ifinfo *mli, const int version)
|
|
{
|
|
int old_version_timer;
|
|
|
|
MLD_LOCK_ASSERT();
|
|
|
|
CTR4(KTR_MLD, "%s: switching to v%d on ifp %p(%s)", __func__,
|
|
version, mli->mli_ifp, mli->mli_ifp->if_xname);
|
|
|
|
if (version == MLD_VERSION_1) {
|
|
/*
|
|
* Compute the "Older Version Querier Present" timer as per
|
|
* Section 9.12.
|
|
*/
|
|
old_version_timer = (mli->mli_rv * mli->mli_qi) + mli->mli_qri;
|
|
old_version_timer *= PR_SLOWHZ;
|
|
mli->mli_v1_timer = old_version_timer;
|
|
}
|
|
|
|
if (mli->mli_v1_timer > 0 && mli->mli_version != MLD_VERSION_1) {
|
|
mli->mli_version = MLD_VERSION_1;
|
|
mld_v2_cancel_link_timers(mli);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Cancel pending MLDv2 timers for the given link and all groups
|
|
* joined on it; state-change, general-query, and group-query timers.
|
|
*/
|
|
static void
|
|
mld_v2_cancel_link_timers(struct mld_ifinfo *mli)
|
|
{
|
|
struct ifmultiaddr *ifma;
|
|
struct ifnet *ifp;
|
|
struct in6_multi *inm;
|
|
|
|
CTR3(KTR_MLD, "%s: cancel v2 timers on ifp %p(%s)", __func__,
|
|
mli->mli_ifp, mli->mli_ifp->if_xname);
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
/*
|
|
* Fast-track this potentially expensive operation
|
|
* by checking all the global 'timer pending' flags.
|
|
*/
|
|
if (!V_interface_timers_running6 &&
|
|
!V_state_change_timers_running6 &&
|
|
!V_current_state_timers_running6)
|
|
return;
|
|
|
|
mli->mli_v2_timer = 0;
|
|
|
|
ifp = mli->mli_ifp;
|
|
|
|
IF_ADDR_LOCK(ifp);
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
|
|
if (ifma->ifma_addr->sa_family != AF_INET6)
|
|
continue;
|
|
inm = (struct in6_multi *)ifma->ifma_protospec;
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
case MLD_LAZY_MEMBER:
|
|
case MLD_SLEEPING_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
break;
|
|
case MLD_LEAVING_MEMBER:
|
|
/*
|
|
* If we are leaving the group and switching
|
|
* version, we need to release the final
|
|
* reference held for issuing the INCLUDE {}.
|
|
*
|
|
* SMPNG: Must drop and re-acquire IF_ADDR_LOCK
|
|
* around in6m_release_locked(), as it is not
|
|
* a recursive mutex.
|
|
*/
|
|
IF_ADDR_UNLOCK(ifp);
|
|
in6m_release_locked(inm);
|
|
IF_ADDR_LOCK(ifp);
|
|
/* FALLTHROUGH */
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_SG_QUERY_PENDING_MEMBER:
|
|
in6m_clear_recorded(inm);
|
|
/* FALLTHROUGH */
|
|
case MLD_REPORTING_MEMBER:
|
|
inm->in6m_sctimer = 0;
|
|
inm->in6m_timer = 0;
|
|
inm->in6m_state = MLD_REPORTING_MEMBER;
|
|
/*
|
|
* Free any pending MLDv2 state-change records.
|
|
*/
|
|
_IF_DRAIN(&inm->in6m_scq);
|
|
break;
|
|
}
|
|
}
|
|
IF_ADDR_UNLOCK(ifp);
|
|
}
|
|
|
|
/*
|
|
* Global slowtimo handler.
|
|
* VIMAGE: Timeout handlers are expected to service all vimages.
|
|
*/
|
|
void
|
|
mld_slowtimo(void)
|
|
{
|
|
VNET_ITERATOR_DECL(vnet_iter);
|
|
|
|
VNET_LIST_RLOCK_NOSLEEP();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET(vnet_iter);
|
|
mld_slowtimo_vnet();
|
|
CURVNET_RESTORE();
|
|
}
|
|
VNET_LIST_RUNLOCK_NOSLEEP();
|
|
}
|
|
|
|
/*
|
|
* Per-vnet slowtimo handler.
|
|
*/
|
|
static void
|
|
mld_slowtimo_vnet(void)
|
|
{
|
|
struct mld_ifinfo *mli;
|
|
|
|
MLD_LOCK();
|
|
|
|
LIST_FOREACH(mli, &V_mli_head, mli_link) {
|
|
mld_v1_process_querier_timers(mli);
|
|
}
|
|
|
|
MLD_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Update the Older Version Querier Present timers for a link.
|
|
* See Section 9.12 of RFC 3810.
|
|
*/
|
|
static void
|
|
mld_v1_process_querier_timers(struct mld_ifinfo *mli)
|
|
{
|
|
|
|
MLD_LOCK_ASSERT();
|
|
|
|
if (mli->mli_version != MLD_VERSION_2 && --mli->mli_v1_timer == 0) {
|
|
/*
|
|
* MLDv1 Querier Present timer expired; revert to MLDv2.
|
|
*/
|
|
CTR5(KTR_MLD,
|
|
"%s: transition from v%d -> v%d on %p(%s)",
|
|
__func__, mli->mli_version, MLD_VERSION_2,
|
|
mli->mli_ifp, mli->mli_ifp->if_xname);
|
|
mli->mli_version = MLD_VERSION_2;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Transmit an MLDv1 report immediately.
|
|
*/
|
|
static int
|
|
mld_v1_transmit_report(struct in6_multi *in6m, const int type)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct in6_ifaddr *ia;
|
|
struct ip6_hdr *ip6;
|
|
struct mbuf *mh, *md;
|
|
struct mld_hdr *mld;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
ifp = in6m->in6m_ifp;
|
|
ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
|
|
/* ia may be NULL if link-local address is tentative. */
|
|
|
|
MGETHDR(mh, M_DONTWAIT, MT_HEADER);
|
|
if (mh == NULL) {
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
return (ENOMEM);
|
|
}
|
|
MGET(md, M_DONTWAIT, MT_DATA);
|
|
if (md == NULL) {
|
|
m_free(mh);
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
return (ENOMEM);
|
|
}
|
|
mh->m_next = md;
|
|
|
|
/*
|
|
* FUTURE: Consider increasing alignment by ETHER_HDR_LEN, so
|
|
* that ether_output() does not need to allocate another mbuf
|
|
* for the header in the most common case.
|
|
*/
|
|
MH_ALIGN(mh, sizeof(struct ip6_hdr));
|
|
mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
|
|
mh->m_len = sizeof(struct ip6_hdr);
|
|
|
|
ip6 = mtod(mh, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
|
|
ip6->ip6_dst = in6m->in6m_addr;
|
|
|
|
md->m_len = sizeof(struct mld_hdr);
|
|
mld = mtod(md, struct mld_hdr *);
|
|
mld->mld_type = type;
|
|
mld->mld_code = 0;
|
|
mld->mld_cksum = 0;
|
|
mld->mld_maxdelay = 0;
|
|
mld->mld_reserved = 0;
|
|
mld->mld_addr = in6m->in6m_addr;
|
|
in6_clearscope(&mld->mld_addr);
|
|
mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
|
|
sizeof(struct ip6_hdr), sizeof(struct mld_hdr));
|
|
|
|
mld_save_context(mh, ifp);
|
|
mh->m_flags |= M_MLDV1;
|
|
|
|
mld_dispatch_packet(mh);
|
|
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Process a state change from the upper layer for the given IPv6 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 MLD 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 MLDv2 state machine at group level. The MLd module
|
|
* however makes the decision as to which MLD protocol version to speak.
|
|
* A state change *from* INCLUDE {} always means an initial join.
|
|
* A state change *to* INCLUDE {} always means a final leave.
|
|
*
|
|
* If delay is non-zero, and the state change is an initial multicast
|
|
* join, the state change report will be delayed by 'delay' ticks
|
|
* in units of PR_FASTHZ if MLDv1 is active on the link; otherwise
|
|
* the initial MLDv2 state change report will be delayed by whichever
|
|
* is sooner, a pending state-change timer or delay itself.
|
|
*
|
|
* VIMAGE: curvnet should have been set by caller, as this routine
|
|
* is called from the socket option handlers.
|
|
*/
|
|
int
|
|
mld_change_state(struct in6_multi *inm, const int delay)
|
|
{
|
|
struct mld_ifinfo *mli;
|
|
struct ifnet *ifp;
|
|
int error;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
|
|
error = 0;
|
|
|
|
/*
|
|
* Try to detect if the upper layer just asked us to change state
|
|
* for an interface which has now gone away.
|
|
*/
|
|
KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
|
|
ifp = inm->in6m_ifma->ifma_ifp;
|
|
if (ifp != NULL) {
|
|
/*
|
|
* Sanity check that netinet6's notion of ifp is the
|
|
* same as net's.
|
|
*/
|
|
KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
|
|
}
|
|
|
|
MLD_LOCK();
|
|
|
|
mli = MLD_IFINFO(ifp);
|
|
KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
|
|
|
|
/*
|
|
* If we detect a state transition to or from MCAST_UNDEFINED
|
|
* for this group, then we are starting or finishing an MLD
|
|
* life cycle for this group.
|
|
*/
|
|
if (inm->in6m_st[1].iss_fmode != inm->in6m_st[0].iss_fmode) {
|
|
CTR3(KTR_MLD, "%s: inm transition %d -> %d", __func__,
|
|
inm->in6m_st[0].iss_fmode, inm->in6m_st[1].iss_fmode);
|
|
if (inm->in6m_st[0].iss_fmode == MCAST_UNDEFINED) {
|
|
CTR1(KTR_MLD, "%s: initial join", __func__);
|
|
error = mld_initial_join(inm, mli, delay);
|
|
goto out_locked;
|
|
} else if (inm->in6m_st[1].iss_fmode == MCAST_UNDEFINED) {
|
|
CTR1(KTR_MLD, "%s: final leave", __func__);
|
|
mld_final_leave(inm, mli);
|
|
goto out_locked;
|
|
}
|
|
} else {
|
|
CTR1(KTR_MLD, "%s: filter set change", __func__);
|
|
}
|
|
|
|
error = mld_handle_state_change(inm, mli);
|
|
|
|
out_locked:
|
|
MLD_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Perform the initial join for an MLD group.
|
|
*
|
|
* When joining a group:
|
|
* If the group should have its MLD traffic suppressed, do nothing.
|
|
* MLDv1 starts sending MLDv1 host membership reports.
|
|
* MLDv2 will schedule an MLDv2 state-change report containing the
|
|
* initial state of the membership.
|
|
*
|
|
* If the delay argument is non-zero, then we must delay sending the
|
|
* initial state change for delay ticks (in units of PR_FASTHZ).
|
|
*/
|
|
static int
|
|
mld_initial_join(struct in6_multi *inm, struct mld_ifinfo *mli,
|
|
const int delay)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ifqueue *ifq;
|
|
int error, retval, syncstates;
|
|
int odelay;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
CTR4(KTR_MLD, "%s: initial join %s on ifp %p(%s)",
|
|
__func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp, inm->in6m_ifp->if_xname);
|
|
|
|
error = 0;
|
|
syncstates = 1;
|
|
|
|
ifp = inm->in6m_ifp;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
KASSERT(mli && mli->mli_ifp == ifp, ("%s: inconsistent ifp", __func__));
|
|
|
|
/*
|
|
* Groups joined on loopback or marked as 'not reported',
|
|
* enter the MLD_SILENT_MEMBER state and
|
|
* are never reported in any protocol exchanges.
|
|
* All other groups enter the appropriate state machine
|
|
* for the version in use on this link.
|
|
* A link marked as MLIF_SILENT causes MLD to be completely
|
|
* disabled for the link.
|
|
*/
|
|
if ((ifp->if_flags & IFF_LOOPBACK) ||
|
|
(mli->mli_flags & MLIF_SILENT) ||
|
|
!mld_is_addr_reported(&inm->in6m_addr)) {
|
|
CTR1(KTR_MLD,
|
|
"%s: not kicking state machine for silent group", __func__);
|
|
inm->in6m_state = MLD_SILENT_MEMBER;
|
|
inm->in6m_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.
|
|
*/
|
|
if (mli->mli_version == MLD_VERSION_2 &&
|
|
inm->in6m_state == MLD_LEAVING_MEMBER)
|
|
in6m_release_locked(inm);
|
|
|
|
inm->in6m_state = MLD_REPORTING_MEMBER;
|
|
|
|
switch (mli->mli_version) {
|
|
case MLD_VERSION_1:
|
|
/*
|
|
* If a delay was provided, only use it if
|
|
* it is greater than the delay normally
|
|
* used for an MLDv1 state change report,
|
|
* and delay sending the initial MLDv1 report
|
|
* by not transitioning to the IDLE state.
|
|
*/
|
|
odelay = MLD_RANDOM_DELAY(MLD_V1_MAX_RI * PR_FASTHZ);
|
|
if (delay) {
|
|
inm->in6m_timer = max(delay, odelay);
|
|
V_current_state_timers_running6 = 1;
|
|
} else {
|
|
inm->in6m_state = MLD_IDLE_MEMBER;
|
|
error = mld_v1_transmit_report(inm,
|
|
MLD_LISTENER_REPORT);
|
|
if (error == 0) {
|
|
inm->in6m_timer = odelay;
|
|
V_current_state_timers_running6 = 1;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MLD_VERSION_2:
|
|
/*
|
|
* 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->in6m_scq;
|
|
_IF_DRAIN(ifq);
|
|
retval = mld_v2_enqueue_group_record(ifq, inm, 1,
|
|
0, 0);
|
|
CTR2(KTR_MLD, "%s: enqueue record = %d",
|
|
__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 mld_fasttimo (~200ms),
|
|
* giving us an opportunity to merge the reports.
|
|
*
|
|
* If a delay was provided to this function, only
|
|
* use this delay if sooner than the existing one.
|
|
*/
|
|
KASSERT(mli->mli_rv > 1,
|
|
("%s: invalid robustness %d", __func__,
|
|
mli->mli_rv));
|
|
inm->in6m_scrv = mli->mli_rv;
|
|
if (delay) {
|
|
if (inm->in6m_sctimer > 1) {
|
|
inm->in6m_sctimer =
|
|
min(inm->in6m_sctimer, delay);
|
|
} else
|
|
inm->in6m_sctimer = delay;
|
|
} else
|
|
inm->in6m_sctimer = 1;
|
|
V_state_change_timers_running6 = 1;
|
|
|
|
error = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
in6m_commit(inm);
|
|
CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
|
|
ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Issue an intermediate state change during the life-cycle.
|
|
*/
|
|
static int
|
|
mld_handle_state_change(struct in6_multi *inm, struct mld_ifinfo *mli)
|
|
{
|
|
struct ifnet *ifp;
|
|
int retval;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
CTR4(KTR_MLD, "%s: state change for %s on ifp %p(%s)",
|
|
__func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp, inm->in6m_ifp->if_xname);
|
|
|
|
ifp = inm->in6m_ifp;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
KASSERT(mli && mli->mli_ifp == ifp,
|
|
("%s: inconsistent ifp", __func__));
|
|
|
|
if ((ifp->if_flags & IFF_LOOPBACK) ||
|
|
(mli->mli_flags & MLIF_SILENT) ||
|
|
!mld_is_addr_reported(&inm->in6m_addr) ||
|
|
(mli->mli_version != MLD_VERSION_2)) {
|
|
if (!mld_is_addr_reported(&inm->in6m_addr)) {
|
|
CTR1(KTR_MLD,
|
|
"%s: not kicking state machine for silent group", __func__);
|
|
}
|
|
CTR1(KTR_MLD, "%s: nothing to do", __func__);
|
|
in6m_commit(inm);
|
|
CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
|
|
ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname);
|
|
return (0);
|
|
}
|
|
|
|
_IF_DRAIN(&inm->in6m_scq);
|
|
|
|
retval = mld_v2_enqueue_group_record(&inm->in6m_scq, inm, 1, 0, 0);
|
|
CTR2(KTR_MLD, "%s: enqueue record = %d", __func__, retval);
|
|
if (retval <= 0)
|
|
return (-retval);
|
|
|
|
/*
|
|
* If record(s) were enqueued, start the state-change
|
|
* report timer for this group.
|
|
*/
|
|
inm->in6m_scrv = mli->mli_rv;
|
|
inm->in6m_sctimer = 1;
|
|
V_state_change_timers_running6 = 1;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Perform the final leave for a multicast address.
|
|
*
|
|
* When leaving a group:
|
|
* MLDv1 sends a DONE message, if and only if we are the reporter.
|
|
* MLDv2 enqueues a state-change report containing a transition
|
|
* to INCLUDE {} for immediate transmission.
|
|
*/
|
|
static void
|
|
mld_final_leave(struct in6_multi *inm, struct mld_ifinfo *mli)
|
|
{
|
|
int syncstates;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
syncstates = 1;
|
|
|
|
CTR4(KTR_MLD, "%s: final leave %s on ifp %p(%s)",
|
|
__func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp, inm->in6m_ifp->if_xname);
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
case MLD_LEAVING_MEMBER:
|
|
/* Already leaving or left; do nothing. */
|
|
CTR1(KTR_MLD,
|
|
"%s: not kicking state machine for silent group", __func__);
|
|
break;
|
|
case MLD_REPORTING_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_SG_QUERY_PENDING_MEMBER:
|
|
if (mli->mli_version == MLD_VERSION_1) {
|
|
#ifdef INVARIANTS
|
|
if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
|
|
inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER)
|
|
panic("%s: MLDv2 state reached, not MLDv2 mode",
|
|
__func__);
|
|
#endif
|
|
mld_v1_transmit_report(inm, MLD_LISTENER_DONE);
|
|
inm->in6m_state = MLD_NOT_MEMBER;
|
|
} else if (mli->mli_version == MLD_VERSION_2) {
|
|
/*
|
|
* Stop group timer and all pending reports.
|
|
* Immediately enqueue a state-change report
|
|
* TO_IN {} to be sent on the next fast timeout,
|
|
* giving us an opportunity to merge reports.
|
|
*/
|
|
_IF_DRAIN(&inm->in6m_scq);
|
|
inm->in6m_timer = 0;
|
|
inm->in6m_scrv = mli->mli_rv;
|
|
CTR4(KTR_MLD, "%s: Leaving %s/%s with %d "
|
|
"pending retransmissions.", __func__,
|
|
ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname, inm->in6m_scrv);
|
|
if (inm->in6m_scrv == 0) {
|
|
inm->in6m_state = MLD_NOT_MEMBER;
|
|
inm->in6m_sctimer = 0;
|
|
} else {
|
|
int retval;
|
|
|
|
in6m_acquire_locked(inm);
|
|
|
|
retval = mld_v2_enqueue_group_record(
|
|
&inm->in6m_scq, inm, 1, 0, 0);
|
|
KASSERT(retval != 0,
|
|
("%s: enqueue record = %d", __func__,
|
|
retval));
|
|
|
|
inm->in6m_state = MLD_LEAVING_MEMBER;
|
|
inm->in6m_sctimer = 1;
|
|
V_state_change_timers_running6 = 1;
|
|
syncstates = 0;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
case MLD_LAZY_MEMBER:
|
|
case MLD_SLEEPING_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
/* Our reports are suppressed; do nothing. */
|
|
break;
|
|
}
|
|
|
|
if (syncstates) {
|
|
in6m_commit(inm);
|
|
CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
|
|
ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname);
|
|
inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
|
|
CTR3(KTR_MLD, "%s: T1 now MCAST_UNDEFINED for %p/%s",
|
|
__func__, &inm->in6m_addr, inm->in6m_ifp->if_xname);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Enqueue an MLDv2 group record to the given output queue.
|
|
*
|
|
* 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 IPv6+ICMP headers 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
|
|
mld_v2_enqueue_group_record(struct ifqueue *ifq, struct in6_multi *inm,
|
|
const int is_state_change, const int is_group_query,
|
|
const int is_source_query)
|
|
{
|
|
struct mldv2_record mr;
|
|
struct mldv2_record *pmr;
|
|
struct ifnet *ifp;
|
|
struct ip6_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;
|
|
uint8_t mode;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
|
|
error = 0;
|
|
ifp = inm->in6m_ifp;
|
|
is_filter_list_change = 0;
|
|
m = NULL;
|
|
m0 = NULL;
|
|
m0srcs = 0;
|
|
msrcs = 0;
|
|
nbytes = 0;
|
|
nims = NULL;
|
|
record_has_sources = 1;
|
|
pmr = NULL;
|
|
type = MLD_DO_NOTHING;
|
|
mode = inm->in6m_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->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0 &&
|
|
inm->in6m_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->in6m_st[0].iss_fmode) {
|
|
if (mode == MCAST_EXCLUDE) {
|
|
CTR1(KTR_MLD, "%s: change to EXCLUDE",
|
|
__func__);
|
|
type = MLD_CHANGE_TO_EXCLUDE_MODE;
|
|
} else {
|
|
CTR1(KTR_MLD, "%s: change to INCLUDE",
|
|
__func__);
|
|
type = MLD_CHANGE_TO_INCLUDE_MODE;
|
|
if (mode == MCAST_UNDEFINED)
|
|
record_has_sources = 0;
|
|
}
|
|
} else {
|
|
if (record_has_sources) {
|
|
is_filter_list_change = 1;
|
|
} else {
|
|
type = MLD_DO_NOTHING;
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* Queue a current state record.
|
|
*/
|
|
if (mode == MCAST_EXCLUDE) {
|
|
type = MLD_MODE_IS_EXCLUDE;
|
|
} else if (mode == MCAST_INCLUDE) {
|
|
type = MLD_MODE_IS_INCLUDE;
|
|
KASSERT(inm->in6m_st[1].iss_asm == 0,
|
|
("%s: inm %p is INCLUDE but ASM count is %d",
|
|
__func__, inm, inm->in6m_st[1].iss_asm));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Generate the filter list changes using a separate function.
|
|
*/
|
|
if (is_filter_list_change)
|
|
return (mld_v2_enqueue_filter_change(ifq, inm));
|
|
|
|
if (type == MLD_DO_NOTHING) {
|
|
CTR3(KTR_MLD, "%s: nothing to do for %s/%s",
|
|
__func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname);
|
|
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 mldv2_record);
|
|
if (record_has_sources)
|
|
minrec0len += sizeof(struct in6_addr);
|
|
|
|
CTR4(KTR_MLD, "%s: queueing %s for %s/%s", __func__,
|
|
mld_rec_type_to_str(type),
|
|
ip6_sprintf(ip6tbuf, &inm->in6m_addr),
|
|
inm->in6m_ifp->if_xname);
|
|
|
|
/*
|
|
* 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 IP6+RA+ICMPV6+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.PH_vt.vt_nrecs + 1 <= MLD_V2_REPORT_MAXRECS) &&
|
|
(m0->m_pkthdr.len + minrec0len) <
|
|
(ifp->if_mtu - MLD_MTUSPACE)) {
|
|
m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
|
|
sizeof(struct mldv2_record)) /
|
|
sizeof(struct in6_addr);
|
|
m = m0;
|
|
CTR1(KTR_MLD, "%s: use existing packet", __func__);
|
|
} else {
|
|
if (_IF_QFULL(ifq)) {
|
|
CTR1(KTR_MLD, "%s: outbound queue full", __func__);
|
|
return (-ENOMEM);
|
|
}
|
|
m = NULL;
|
|
m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
|
|
sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
|
|
if (!is_state_change && !is_group_query)
|
|
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
|
|
if (m == NULL)
|
|
m = m_gethdr(M_DONTWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return (-ENOMEM);
|
|
|
|
mld_save_context(m, ifp);
|
|
|
|
CTR1(KTR_MLD, "%s: allocated first packet", __func__);
|
|
}
|
|
|
|
/*
|
|
* Append group record.
|
|
* If we have sources, we don't know how many yet.
|
|
*/
|
|
mr.mr_type = type;
|
|
mr.mr_datalen = 0;
|
|
mr.mr_numsrc = 0;
|
|
mr.mr_addr = inm->in6m_addr;
|
|
in6_clearscope(&mr.mr_addr);
|
|
if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
|
|
if (m != m0)
|
|
m_freem(m);
|
|
CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
|
|
return (-ENOMEM);
|
|
}
|
|
nbytes += sizeof(struct mldv2_record);
|
|
|
|
/*
|
|
* 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);
|
|
pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
|
|
md->m_len - nbytes);
|
|
} else {
|
|
md = m_getptr(m, 0, &off);
|
|
pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
|
|
off);
|
|
}
|
|
msrcs = 0;
|
|
RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs,
|
|
nims) {
|
|
CTR2(KTR_MLD, "%s: visit node %s", __func__,
|
|
ip6_sprintf(ip6tbuf, &ims->im6s_addr));
|
|
now = im6s_get_mode(inm, ims, 1);
|
|
CTR2(KTR_MLD, "%s: node is %d", __func__, now);
|
|
if ((now != mode) ||
|
|
(now == mode && mode == MCAST_UNDEFINED)) {
|
|
CTR1(KTR_MLD, "%s: skip node", __func__);
|
|
continue;
|
|
}
|
|
if (is_source_query && ims->im6s_stp == 0) {
|
|
CTR1(KTR_MLD, "%s: skip unrecorded node",
|
|
__func__);
|
|
continue;
|
|
}
|
|
CTR1(KTR_MLD, "%s: append node", __func__);
|
|
if (!m_append(m, sizeof(struct in6_addr),
|
|
(void *)&ims->im6s_addr)) {
|
|
if (m != m0)
|
|
m_freem(m);
|
|
CTR1(KTR_MLD, "%s: m_append() failed.",
|
|
__func__);
|
|
return (-ENOMEM);
|
|
}
|
|
nbytes += sizeof(struct in6_addr);
|
|
++msrcs;
|
|
if (msrcs == m0srcs)
|
|
break;
|
|
}
|
|
CTR2(KTR_MLD, "%s: msrcs is %d this packet", __func__,
|
|
msrcs);
|
|
pmr->mr_numsrc = htons(msrcs);
|
|
nbytes += (msrcs * sizeof(struct in6_addr));
|
|
}
|
|
|
|
if (is_source_query && msrcs == 0) {
|
|
CTR1(KTR_MLD, "%s: no recorded sources to report", __func__);
|
|
if (m != m0)
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* We are good to go with first packet.
|
|
*/
|
|
if (m != m0) {
|
|
CTR1(KTR_MLD, "%s: enqueueing first packet", __func__);
|
|
m->m_pkthdr.PH_vt.vt_nrecs = 1;
|
|
_IF_ENQUEUE(ifq, m);
|
|
} else
|
|
m->m_pkthdr.PH_vt.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)) {
|
|
CTR1(KTR_MLD, "%s: outbound queue full", __func__);
|
|
return (-ENOMEM);
|
|
}
|
|
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
|
|
if (m == NULL)
|
|
m = m_gethdr(M_DONTWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return (-ENOMEM);
|
|
mld_save_context(m, ifp);
|
|
md = m_getptr(m, 0, &off);
|
|
pmr = (struct mldv2_record *)(mtod(md, uint8_t *) + off);
|
|
CTR1(KTR_MLD, "%s: allocated next packet", __func__);
|
|
|
|
if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
|
|
if (m != m0)
|
|
m_freem(m);
|
|
CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
|
|
return (-ENOMEM);
|
|
}
|
|
m->m_pkthdr.PH_vt.vt_nrecs = 1;
|
|
nbytes += sizeof(struct mldv2_record);
|
|
|
|
m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
|
|
sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
|
|
|
|
msrcs = 0;
|
|
RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
|
|
CTR2(KTR_MLD, "%s: visit node %s",
|
|
__func__, ip6_sprintf(ip6tbuf, &ims->im6s_addr));
|
|
now = im6s_get_mode(inm, ims, 1);
|
|
if ((now != mode) ||
|
|
(now == mode && mode == MCAST_UNDEFINED)) {
|
|
CTR1(KTR_MLD, "%s: skip node", __func__);
|
|
continue;
|
|
}
|
|
if (is_source_query && ims->im6s_stp == 0) {
|
|
CTR1(KTR_MLD, "%s: skip unrecorded node",
|
|
__func__);
|
|
continue;
|
|
}
|
|
CTR1(KTR_MLD, "%s: append node", __func__);
|
|
if (!m_append(m, sizeof(struct in6_addr),
|
|
(void *)&ims->im6s_addr)) {
|
|
if (m != m0)
|
|
m_freem(m);
|
|
CTR1(KTR_MLD, "%s: m_append() failed.",
|
|
__func__);
|
|
return (-ENOMEM);
|
|
}
|
|
++msrcs;
|
|
if (msrcs == m0srcs)
|
|
break;
|
|
}
|
|
pmr->mr_numsrc = htons(msrcs);
|
|
nbytes += (msrcs * sizeof(struct in6_addr));
|
|
|
|
CTR1(KTR_MLD, "%s: enqueueing next packet", __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 MLDv2 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
|
|
mld_v2_enqueue_filter_change(struct ifqueue *ifq, struct in6_multi *inm)
|
|
{
|
|
static const int MINRECLEN =
|
|
sizeof(struct mldv2_record) + sizeof(struct in6_addr);
|
|
struct ifnet *ifp;
|
|
struct mldv2_record mr;
|
|
struct mldv2_record *pmr;
|
|
struct ip6_msource *ims, *nims;
|
|
struct mbuf *m, *m0, *md;
|
|
int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
|
|
int nallow, nblock;
|
|
uint8_t mode, now, then;
|
|
rectype_t crt, drt, nrt;
|
|
#ifdef KTR
|
|
char ip6tbuf[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
|
|
if (inm->in6m_nsrc == 0 ||
|
|
(inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0))
|
|
return (0);
|
|
|
|
ifp = inm->in6m_ifp; /* interface */
|
|
mode = inm->in6m_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 */
|
|
npbytes = 0; /* # of bytes appended this packet */
|
|
nbytes = 0; /* # of bytes appended to group's state-change queue */
|
|
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.PH_vt.vt_nrecs + 1 <=
|
|
MLD_V2_REPORT_MAXRECS) &&
|
|
(m0->m_pkthdr.len + MINRECLEN) <
|
|
(ifp->if_mtu - MLD_MTUSPACE)) {
|
|
m = m0;
|
|
m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
|
|
sizeof(struct mldv2_record)) /
|
|
sizeof(struct in6_addr);
|
|
CTR1(KTR_MLD,
|
|
"%s: use previous packet", __func__);
|
|
} else {
|
|
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
|
|
if (m == NULL)
|
|
m = m_gethdr(M_DONTWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
CTR1(KTR_MLD,
|
|
"%s: m_get*() failed", __func__);
|
|
return (-ENOMEM);
|
|
}
|
|
m->m_pkthdr.PH_vt.vt_nrecs = 0;
|
|
mld_save_context(m, ifp);
|
|
m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
|
|
sizeof(struct mldv2_record)) /
|
|
sizeof(struct in6_addr);
|
|
npbytes = 0;
|
|
CTR1(KTR_MLD,
|
|
"%s: allocated new packet", __func__);
|
|
}
|
|
/*
|
|
* Append the MLD 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(&mr, 0, sizeof(mr));
|
|
mr.mr_addr = inm->in6m_addr;
|
|
in6_clearscope(&mr.mr_addr);
|
|
if (!m_append(m, sizeof(mr), (void *)&mr)) {
|
|
if (m != m0)
|
|
m_freem(m);
|
|
CTR1(KTR_MLD,
|
|
"%s: m_append() failed", __func__);
|
|
return (-ENOMEM);
|
|
}
|
|
npbytes += sizeof(struct mldv2_record);
|
|
if (m != m0) {
|
|
/* new packet; offset in chain */
|
|
md = m_getptr(m, npbytes -
|
|
sizeof(struct mldv2_record), &off);
|
|
pmr = (struct mldv2_record *)(mtod(md,
|
|
uint8_t *) + off);
|
|
} else {
|
|
/* current packet; offset from last append */
|
|
md = m_last(m);
|
|
pmr = (struct mldv2_record *)(mtod(md,
|
|
uint8_t *) + md->m_len -
|
|
sizeof(struct mldv2_record));
|
|
}
|
|
/*
|
|
* 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(ip6_msource_tree,
|
|
&inm->in6m_srcs);
|
|
}
|
|
RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
|
|
CTR2(KTR_MLD, "%s: visit node %s", __func__,
|
|
ip6_sprintf(ip6tbuf, &ims->im6s_addr));
|
|
now = im6s_get_mode(inm, ims, 1);
|
|
then = im6s_get_mode(inm, ims, 0);
|
|
CTR3(KTR_MLD, "%s: mode: t0 %d, t1 %d",
|
|
__func__, then, now);
|
|
if (now == then) {
|
|
CTR1(KTR_MLD,
|
|
"%s: skip unchanged", __func__);
|
|
continue;
|
|
}
|
|
if (mode == MCAST_EXCLUDE &&
|
|
now == MCAST_INCLUDE) {
|
|
CTR1(KTR_MLD,
|
|
"%s: skip IN src on EX group",
|
|
__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;
|
|
if (!m_append(m, sizeof(struct in6_addr),
|
|
(void *)&ims->im6s_addr)) {
|
|
if (m != m0)
|
|
m_freem(m);
|
|
CTR1(KTR_MLD,
|
|
"%s: m_append() failed", __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 mldv2_record);
|
|
if (m != m0) {
|
|
CTR1(KTR_MLD,
|
|
"%s: m_free(m)", __func__);
|
|
m_freem(m);
|
|
} else {
|
|
CTR1(KTR_MLD,
|
|
"%s: m_adj(m, -mr)", __func__);
|
|
m_adj(m, -((int)sizeof(
|
|
struct mldv2_record)));
|
|
}
|
|
continue;
|
|
}
|
|
npbytes += (rsrcs * sizeof(struct in6_addr));
|
|
if (crt == REC_ALLOW)
|
|
pmr->mr_type = MLD_ALLOW_NEW_SOURCES;
|
|
else if (crt == REC_BLOCK)
|
|
pmr->mr_type = MLD_BLOCK_OLD_SOURCES;
|
|
pmr->mr_numsrc = htons(rsrcs);
|
|
/*
|
|
* Count the new group record, and enqueue this
|
|
* packet if it wasn't already queued.
|
|
*/
|
|
m->m_pkthdr.PH_vt.vt_nrecs++;
|
|
if (m != m0)
|
|
_IF_ENQUEUE(ifq, m);
|
|
nbytes += npbytes;
|
|
} while (nims != NULL);
|
|
drt |= crt;
|
|
crt = (~crt & REC_FULL);
|
|
}
|
|
|
|
CTR3(KTR_MLD, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__,
|
|
nallow, nblock);
|
|
|
|
return (nbytes);
|
|
}
|
|
|
|
static int
|
|
mld_v2_merge_state_changes(struct in6_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 */
|
|
int docopy, domerge;
|
|
u_int recslen;
|
|
|
|
docopy = 0;
|
|
domerge = 0;
|
|
recslen = 0;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
/*
|
|
* If there are further pending retransmissions, make a writable
|
|
* copy of each queued state-change message before merging.
|
|
*/
|
|
if (inm->in6m_scrv > 0)
|
|
docopy = 1;
|
|
|
|
gq = &inm->in6m_scq;
|
|
#ifdef KTR
|
|
if (gq->ifq_head == NULL) {
|
|
CTR2(KTR_MLD, "%s: WARNING: queue for inm %p is empty",
|
|
__func__, inm);
|
|
}
|
|
#endif
|
|
|
|
m = gq->ifq_head;
|
|
while (m != NULL) {
|
|
/*
|
|
* Only merge the report into the current packet if
|
|
* there is sufficient space to do so; an MLDv2 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, NULL);
|
|
|
|
if ((mt->m_pkthdr.PH_vt.vt_nrecs +
|
|
m->m_pkthdr.PH_vt.vt_nrecs <=
|
|
MLD_V2_REPORT_MAXRECS) &&
|
|
(mt->m_pkthdr.len + recslen <=
|
|
(inm->in6m_ifp->if_mtu - MLD_MTUSPACE)))
|
|
domerge = 1;
|
|
}
|
|
|
|
if (!domerge && _IF_QFULL(gq)) {
|
|
CTR2(KTR_MLD,
|
|
"%s: outbound queue full, skipping whole packet %p",
|
|
__func__, m);
|
|
mt = m->m_nextpkt;
|
|
if (!docopy)
|
|
m_freem(m);
|
|
m = mt;
|
|
continue;
|
|
}
|
|
|
|
if (!docopy) {
|
|
CTR2(KTR_MLD, "%s: dequeueing %p", __func__, m);
|
|
_IF_DEQUEUE(gq, m0);
|
|
m = m0->m_nextpkt;
|
|
} else {
|
|
CTR2(KTR_MLD, "%s: copying %p", __func__, m);
|
|
m0 = m_dup(m, M_NOWAIT);
|
|
if (m0 == NULL)
|
|
return (ENOMEM);
|
|
m0->m_nextpkt = NULL;
|
|
m = m->m_nextpkt;
|
|
}
|
|
|
|
if (!domerge) {
|
|
CTR3(KTR_MLD, "%s: queueing %p to ifscq %p)",
|
|
__func__, m0, ifscq);
|
|
_IF_ENQUEUE(ifscq, m0);
|
|
} else {
|
|
struct mbuf *mtl; /* last mbuf of packet mt */
|
|
|
|
CTR3(KTR_MLD, "%s: merging %p with ifscq tail %p)",
|
|
__func__, m0, mt);
|
|
|
|
mtl = m_last(mt);
|
|
m0->m_flags &= ~M_PKTHDR;
|
|
mt->m_pkthdr.len += recslen;
|
|
mt->m_pkthdr.PH_vt.vt_nrecs +=
|
|
m0->m_pkthdr.PH_vt.vt_nrecs;
|
|
|
|
mtl->m_next = m0;
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Respond to a pending MLDv2 General Query.
|
|
*/
|
|
static void
|
|
mld_v2_dispatch_general_query(struct mld_ifinfo *mli)
|
|
{
|
|
struct ifmultiaddr *ifma, *tifma;
|
|
struct ifnet *ifp;
|
|
struct in6_multi *inm;
|
|
int retval;
|
|
|
|
IN6_MULTI_LOCK_ASSERT();
|
|
MLD_LOCK_ASSERT();
|
|
|
|
KASSERT(mli->mli_version == MLD_VERSION_2,
|
|
("%s: called when version %d", __func__, mli->mli_version));
|
|
|
|
ifp = mli->mli_ifp;
|
|
|
|
IF_ADDR_LOCK(ifp);
|
|
TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, tifma) {
|
|
if (ifma->ifma_addr->sa_family != AF_INET6 ||
|
|
ifma->ifma_protospec == NULL)
|
|
continue;
|
|
|
|
inm = (struct in6_multi *)ifma->ifma_protospec;
|
|
KASSERT(ifp == inm->in6m_ifp,
|
|
("%s: inconsistent ifp", __func__));
|
|
|
|
switch (inm->in6m_state) {
|
|
case MLD_NOT_MEMBER:
|
|
case MLD_SILENT_MEMBER:
|
|
break;
|
|
case MLD_REPORTING_MEMBER:
|
|
case MLD_IDLE_MEMBER:
|
|
case MLD_LAZY_MEMBER:
|
|
case MLD_SLEEPING_MEMBER:
|
|
case MLD_AWAKENING_MEMBER:
|
|
inm->in6m_state = MLD_REPORTING_MEMBER;
|
|
retval = mld_v2_enqueue_group_record(&mli->mli_gq,
|
|
inm, 0, 0, 0);
|
|
CTR2(KTR_MLD, "%s: enqueue record = %d",
|
|
__func__, retval);
|
|
break;
|
|
case MLD_G_QUERY_PENDING_MEMBER:
|
|
case MLD_SG_QUERY_PENDING_MEMBER:
|
|
case MLD_LEAVING_MEMBER:
|
|
break;
|
|
}
|
|
}
|
|
IF_ADDR_UNLOCK(ifp);
|
|
|
|
mld_dispatch_queue(&mli->mli_gq, MLD_MAX_RESPONSE_BURST);
|
|
|
|
/*
|
|
* Slew transmission of bursts over 500ms intervals.
|
|
*/
|
|
if (mli->mli_gq.ifq_head != NULL) {
|
|
mli->mli_v2_timer = 1 + MLD_RANDOM_DELAY(
|
|
MLD_RESPONSE_BURST_INTERVAL);
|
|
V_interface_timers_running6 = 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Transmit the next pending message in the output queue.
|
|
*
|
|
* VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis.
|
|
* MRT: Nothing needs to be done, as MLD traffic is always local to
|
|
* a link and uses a link-scope multicast address.
|
|
*/
|
|
static void
|
|
mld_dispatch_packet(struct mbuf *m)
|
|
{
|
|
struct ip6_moptions im6o;
|
|
struct ifnet *ifp;
|
|
struct ifnet *oifp;
|
|
struct mbuf *m0;
|
|
struct mbuf *md;
|
|
struct ip6_hdr *ip6;
|
|
struct mld_hdr *mld;
|
|
int error;
|
|
int off;
|
|
int type;
|
|
uint32_t ifindex;
|
|
|
|
CTR2(KTR_MLD, "%s: transmit %p", __func__, m);
|
|
|
|
/*
|
|
* Set VNET image pointer from enqueued mbuf chain
|
|
* before doing anything else. Whilst we use interface
|
|
* indexes to guard against interface detach, they are
|
|
* unique to each VIMAGE and must be retrieved.
|
|
*/
|
|
ifindex = mld_restore_context(m);
|
|
|
|
/*
|
|
* Check if the ifnet still exists. This limits the scope of
|
|
* any race in the absence of a global ifp lock for low cost
|
|
* (an array lookup).
|
|
*/
|
|
ifp = ifnet_byindex(ifindex);
|
|
if (ifp == NULL) {
|
|
CTR3(KTR_MLD, "%s: dropped %p as ifindex %u went away.",
|
|
__func__, m, ifindex);
|
|
m_freem(m);
|
|
IP6STAT_INC(ip6s_noroute);
|
|
goto out;
|
|
}
|
|
|
|
im6o.im6o_multicast_hlim = 1;
|
|
im6o.im6o_multicast_loop = (V_ip6_mrouter != NULL);
|
|
im6o.im6o_multicast_ifp = ifp;
|
|
|
|
if (m->m_flags & M_MLDV1) {
|
|
m0 = m;
|
|
} else {
|
|
m0 = mld_v2_encap_report(ifp, m);
|
|
if (m0 == NULL) {
|
|
CTR2(KTR_MLD, "%s: dropped %p", __func__, m);
|
|
m_freem(m);
|
|
IP6STAT_INC(ip6s_odropped);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
mld_scrub_context(m0);
|
|
m->m_flags &= ~(M_PROTOFLAGS);
|
|
m0->m_pkthdr.rcvif = V_loif;
|
|
|
|
ip6 = mtod(m0, struct ip6_hdr *);
|
|
#if 0
|
|
(void)in6_setscope(&ip6->ip6_dst, ifp, NULL); /* XXX LOR */
|
|
#else
|
|
/*
|
|
* XXX XXX Break some KPI rules to prevent an LOR which would
|
|
* occur if we called in6_setscope() at transmission.
|
|
* See comments at top of file.
|
|
*/
|
|
MLD_EMBEDSCOPE(&ip6->ip6_dst, ifp->if_index);
|
|
#endif
|
|
|
|
/*
|
|
* Retrieve the ICMPv6 type before handoff to ip6_output(),
|
|
* so we can bump the stats.
|
|
*/
|
|
md = m_getptr(m0, sizeof(struct ip6_hdr), &off);
|
|
mld = (struct mld_hdr *)(mtod(md, uint8_t *) + off);
|
|
type = mld->mld_type;
|
|
|
|
error = ip6_output(m0, &mld_po, NULL, IPV6_UNSPECSRC, &im6o,
|
|
&oifp, NULL);
|
|
if (error) {
|
|
CTR3(KTR_MLD, "%s: ip6_output(%p) = %d", __func__, m0, error);
|
|
goto out;
|
|
}
|
|
ICMP6STAT_INC(icp6s_outhist[type]);
|
|
if (oifp != NULL) {
|
|
icmp6_ifstat_inc(oifp, ifs6_out_msg);
|
|
switch (type) {
|
|
case MLD_LISTENER_REPORT:
|
|
case MLDV2_LISTENER_REPORT:
|
|
icmp6_ifstat_inc(oifp, ifs6_out_mldreport);
|
|
break;
|
|
case MLD_LISTENER_DONE:
|
|
icmp6_ifstat_inc(oifp, ifs6_out_mlddone);
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Encapsulate an MLDv2 report.
|
|
*
|
|
* KAME IPv6 requires that hop-by-hop options be passed separately,
|
|
* and that the IPv6 header be prepended in a separate mbuf.
|
|
*
|
|
* Returns a pointer to the new mbuf chain head, or NULL if the
|
|
* allocation failed.
|
|
*/
|
|
static struct mbuf *
|
|
mld_v2_encap_report(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct mbuf *mh;
|
|
struct mldv2_report *mld;
|
|
struct ip6_hdr *ip6;
|
|
struct in6_ifaddr *ia;
|
|
int mldreclen;
|
|
|
|
KASSERT(ifp != NULL, ("%s: null ifp", __func__));
|
|
KASSERT((m->m_flags & M_PKTHDR),
|
|
("%s: mbuf chain %p is !M_PKTHDR", __func__, m));
|
|
|
|
/*
|
|
* RFC3590: OK to send as :: or tentative during DAD.
|
|
*/
|
|
ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
|
|
if (ia == NULL)
|
|
CTR1(KTR_MLD, "%s: warning: ia is NULL", __func__);
|
|
|
|
MGETHDR(mh, M_DONTWAIT, MT_HEADER);
|
|
if (mh == NULL) {
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
MH_ALIGN(mh, sizeof(struct ip6_hdr) + sizeof(struct mldv2_report));
|
|
|
|
mldreclen = m_length(m, NULL);
|
|
CTR2(KTR_MLD, "%s: mldreclen is %d", __func__, mldreclen);
|
|
|
|
mh->m_len = sizeof(struct ip6_hdr) + sizeof(struct mldv2_report);
|
|
mh->m_pkthdr.len = sizeof(struct ip6_hdr) +
|
|
sizeof(struct mldv2_report) + mldreclen;
|
|
|
|
ip6 = mtod(mh, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
ip6->ip6_dst = in6addr_linklocal_allv2routers;
|
|
/* scope ID will be set in netisr */
|
|
|
|
mld = (struct mldv2_report *)(ip6 + 1);
|
|
mld->mld_type = MLDV2_LISTENER_REPORT;
|
|
mld->mld_code = 0;
|
|
mld->mld_cksum = 0;
|
|
mld->mld_v2_reserved = 0;
|
|
mld->mld_v2_numrecs = htons(m->m_pkthdr.PH_vt.vt_nrecs);
|
|
m->m_pkthdr.PH_vt.vt_nrecs = 0;
|
|
|
|
mh->m_next = m;
|
|
mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
|
|
sizeof(struct ip6_hdr), sizeof(struct mldv2_report) + mldreclen);
|
|
return (mh);
|
|
}
|
|
|
|
#ifdef KTR
|
|
static char *
|
|
mld_rec_type_to_str(const int type)
|
|
{
|
|
|
|
switch (type) {
|
|
case MLD_CHANGE_TO_EXCLUDE_MODE:
|
|
return "TO_EX";
|
|
break;
|
|
case MLD_CHANGE_TO_INCLUDE_MODE:
|
|
return "TO_IN";
|
|
break;
|
|
case MLD_MODE_IS_EXCLUDE:
|
|
return "MODE_EX";
|
|
break;
|
|
case MLD_MODE_IS_INCLUDE:
|
|
return "MODE_IN";
|
|
break;
|
|
case MLD_ALLOW_NEW_SOURCES:
|
|
return "ALLOW_NEW";
|
|
break;
|
|
case MLD_BLOCK_OLD_SOURCES:
|
|
return "BLOCK_OLD";
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return "unknown";
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
mld_init(void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_MLD, "%s: initializing", __func__);
|
|
MLD_LOCK_INIT();
|
|
|
|
ip6_initpktopts(&mld_po);
|
|
mld_po.ip6po_hlim = 1;
|
|
mld_po.ip6po_hbh = &mld_ra.hbh;
|
|
mld_po.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER;
|
|
mld_po.ip6po_flags = IP6PO_DONTFRAG;
|
|
}
|
|
SYSINIT(mld_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_init, NULL);
|
|
|
|
static void
|
|
mld_uninit(void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_MLD, "%s: tearing down", __func__);
|
|
MLD_LOCK_DESTROY();
|
|
}
|
|
SYSUNINIT(mld_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_uninit, NULL);
|
|
|
|
static void
|
|
vnet_mld_init(const void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_MLD, "%s: initializing", __func__);
|
|
|
|
LIST_INIT(&V_mli_head);
|
|
}
|
|
VNET_SYSINIT(vnet_mld_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_init,
|
|
NULL);
|
|
|
|
static void
|
|
vnet_mld_uninit(const void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_MLD, "%s: tearing down", __func__);
|
|
|
|
KASSERT(LIST_EMPTY(&V_mli_head),
|
|
("%s: mli list not empty; ifnets not detached?", __func__));
|
|
}
|
|
VNET_SYSUNINIT(vnet_mld_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_uninit,
|
|
NULL);
|
|
|
|
static int
|
|
mld_modevent(module_t mod, int type, void *unused __unused)
|
|
{
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
case MOD_UNLOAD:
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static moduledata_t mld_mod = {
|
|
"mld",
|
|
mld_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(mld, mld_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|