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freebsd-skq/sys/netinet/igmp.c
bz b7ff2bdc20 After r193232 rt_tables in vnet.h are no longer indirectly dependent on 
the ROUTETABLES kernel option thus there is no need to include opt_route.h
anymore in all consumers of vnet.h and no longer depend on it for module
builds.

Remove the hidden include in flowtable.h as well and leave the two
explicit #includes in ip_input.c and ip_output.c.
2009-06-08 19:57:35 +00:00

3700 lines
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/*-
* Copyright (c) 2007-2009 Bruce Simpson.
* Copyright (c) 1988 Stephen Deering.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Stephen Deering of Stanford University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)igmp.c 8.1 (Berkeley) 7/19/93
*/
/*
* Internet Group Management Protocol (IGMP) routines.
* [RFC1112, RFC2236, RFC3376]
*
* Written by Steve Deering, Stanford, May 1988.
* Modified by Rosen Sharma, Stanford, Aug 1994.
* Modified by Bill Fenner, Xerox PARC, Feb 1995.
* Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995.
* Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson.
*
* MULTICAST Revision: 3.5.1.4
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/vimage.h>
#include <sys/ktr.h>
#include <sys/condvar.h>
#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_options.h>
#include <netinet/igmp.h>
#include <netinet/igmp_var.h>
#include <netinet/vinet.h>
#include <machine/in_cksum.h>
#include <security/mac/mac_framework.h>
#ifndef KTR_IGMPV3
#define KTR_IGMPV3 KTR_INET
#endif
static struct igmp_ifinfo *
igi_alloc_locked(struct ifnet *);
static void igi_delete_locked(const struct ifnet *);
static void igmp_dispatch_queue(struct ifqueue *, int, const int);
static void igmp_fasttimo_vnet(void);
static void igmp_final_leave(struct in_multi *, struct igmp_ifinfo *);
static int igmp_handle_state_change(struct in_multi *,
struct igmp_ifinfo *);
static int igmp_initial_join(struct in_multi *, struct igmp_ifinfo *);
static int igmp_input_v1_query(struct ifnet *, const struct ip *,
const struct igmp *);
static int igmp_input_v2_query(struct ifnet *, const struct ip *,
const struct igmp *);
static int igmp_input_v3_query(struct ifnet *, const struct ip *,
/*const*/ struct igmpv3 *);
static int igmp_input_v3_group_query(struct in_multi *,
struct igmp_ifinfo *, int, /*const*/ struct igmpv3 *);
static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *,
/*const*/ struct igmp *);
static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *,
/*const*/ struct igmp *);
static void igmp_intr(struct mbuf *);
static int igmp_isgroupreported(const struct in_addr);
static struct mbuf *
igmp_ra_alloc(void);
#ifdef KTR
static char * igmp_rec_type_to_str(const int);
#endif
static void igmp_set_version(struct igmp_ifinfo *, const int);
static void igmp_slowtimo_vnet(void);
static void igmp_sysinit(void);
static int igmp_v1v2_queue_report(struct in_multi *, const int);
static void igmp_v1v2_process_group_timer(struct in_multi *, const int);
static void igmp_v1v2_process_querier_timers(struct igmp_ifinfo *);
static void igmp_v2_update_group(struct in_multi *, const int);
static void igmp_v3_cancel_link_timers(struct igmp_ifinfo *);
static void igmp_v3_dispatch_general_query(struct igmp_ifinfo *);
static struct mbuf *
igmp_v3_encap_report(struct ifnet *, struct mbuf *);
static int igmp_v3_enqueue_group_record(struct ifqueue *,
struct in_multi *, const int, const int, const int);
static int igmp_v3_enqueue_filter_change(struct ifqueue *,
struct in_multi *);
static void igmp_v3_process_group_timers(struct igmp_ifinfo *,
struct ifqueue *, struct ifqueue *, struct in_multi *,
const int);
static int igmp_v3_merge_state_changes(struct in_multi *,
struct ifqueue *);
static void igmp_v3_suppress_group_record(struct in_multi *);
static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS);
static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS);
static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS);
static vnet_attach_fn vnet_igmp_iattach;
static vnet_detach_fn vnet_igmp_idetach;
static const struct netisr_handler igmp_nh = {
.nh_name = "igmp",
.nh_handler = igmp_intr,
.nh_proto = NETISR_IGMP,
.nh_policy = NETISR_POLICY_SOURCE,
};
/*
* System-wide globals.
*
* Unlocked access to these is OK, except for the global IGMP output
* queue. The IGMP subsystem lock ends up being system-wide for the moment,
* because all VIMAGEs have to share a global output queue, as netisrs
* themselves are not virtualized.
*
* Locking:
* * The permitted lock order is: IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK.
* Any may be taken independently; if any are held at the same
* time, the above lock order must be followed.
* * All output is delegated to the netisr.
* Now that Giant has been eliminated, the netisr may be inlined.
* * IN_MULTI_LOCK covers in_multi.
* * IGMP_LOCK covers igmp_ifinfo and any global variables in this file,
* including the output queue.
* * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of
* per-link state iterators.
* * igmp_ifinfo is valid as long as PF_INET is attached to the interface,
* therefore it is not refcounted.
* We allow unlocked reads of igmp_ifinfo when accessed via in_multi.
*
* Reference counting
* * IGMP acquires its own reference every time an in_multi is passed to
* it and the group is being joined for the first time.
* * IGMP releases its reference(s) on in_multi in a deferred way,
* because the operations which process the release run as part of
* a loop whose control variables are directly affected by the release
* (that, and not recursing on the IF_ADDR_LOCK).
*
* VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds
* to a vnet in ifp->if_vnet.
*
* SMPng: XXX We may potentially race operations on ifma_protospec.
* The problem is that we currently lack a clean way of taking the
* IF_ADDR_LOCK() between the ifnet and in layers w/o recursing,
* as anything which modifies ifma needs to be covered by that lock.
* So check for ifma_protospec being NULL before proceeding.
*/
struct mtx igmp_mtx;
struct mbuf *m_raopt; /* Router Alert option */
MALLOC_DEFINE(M_IGMP, "igmp", "igmp state");
/*
* VIMAGE-wide globals.
*
* The IGMPv3 timers themselves need to run per-image, however,
* protosw timers run globally (see tcp).
* An ifnet can only be in one vimage at a time, and the loopback
* ifnet, loif, is itself virtualized.
* It would otherwise be possible to seriously hose IGMP state,
* and create inconsistencies in upstream multicast routing, if you have
* multiple VIMAGEs running on the same link joining different multicast
* groups, UNLESS the "primary IP address" is different. This is because
* IGMP for IPv4 does not force link-local addresses to be used for each
* node, unlike MLD for IPv6.
* Obviously the IGMPv3 per-interface state has per-vimage granularity
* also as a result.
*
* FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection
* policy to control the address used by IGMP on the link.
*/
#ifdef VIMAGE_GLOBALS
int interface_timers_running; /* IGMPv3 general query response */
int state_change_timers_running; /* IGMPv3 state-change retransmit */
int current_state_timers_running; /* IGMPv1/v2 host report;
* IGMPv3 g/sg query response */
LIST_HEAD(, igmp_ifinfo) igi_head;
struct igmpstat igmpstat;
struct timeval igmp_gsrdelay;
int igmp_recvifkludge;
int igmp_sendra;
int igmp_sendlocal;
int igmp_v1enable;
int igmp_v2enable;
int igmp_legacysupp;
int igmp_default_version;
#endif /* VIMAGE_GLOBALS */
/*
* Virtualized sysctls.
*/
SYSCTL_V_STRUCT(V_NET, vnet_inet, _net_inet_igmp, IGMPCTL_STATS, stats,
CTLFLAG_RW, igmpstat, igmpstat, "");
SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, recvifkludge,
CTLFLAG_RW, igmp_recvifkludge, 0,
"Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address");
SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, sendra,
CTLFLAG_RW, igmp_sendra, 0,
"Send IP Router Alert option in IGMPv2/v3 messages");
SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, sendlocal,
CTLFLAG_RW, igmp_sendlocal, 0,
"Send IGMP membership reports for 224.0.0.0/24 groups");
SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, v1enable,
CTLFLAG_RW, igmp_v1enable, 0,
"Enable backwards compatibility with IGMPv1");
SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, v2enable,
CTLFLAG_RW, igmp_v2enable, 0,
"Enable backwards compatibility with IGMPv2");
SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, legacysupp,
CTLFLAG_RW, igmp_legacysupp, 0,
"Allow v1/v2 reports to suppress v3 group responses");
SYSCTL_V_PROC(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, default_version,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, igmp_default_version, 0,
sysctl_igmp_default_version, "I",
"Default version of IGMP to run on each interface");
SYSCTL_V_PROC(V_NET, vnet_inet, _net_inet_igmp, OID_AUTO, gsrdelay,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, igmp_gsrdelay.tv_sec, 0,
sysctl_igmp_gsr, "I",
"Rate limit for IGMPv3 Group-and-Source queries in seconds");
/*
* Non-virtualized sysctls.
*/
SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_igmp_ifinfo, "Per-interface IGMPv3 state");
static __inline void
igmp_save_context(struct mbuf *m, struct ifnet *ifp)
{
#ifdef VIMAGE
m->m_pkthdr.header = ifp->if_vnet;
#endif /* VIMAGE */
m->m_pkthdr.flowid = ifp->if_index;
}
static __inline void
igmp_scrub_context(struct mbuf *m)
{
m->m_pkthdr.header = NULL;
m->m_pkthdr.flowid = 0;
}
#ifdef KTR
static __inline char *
inet_ntoa_haddr(in_addr_t haddr)
{
struct in_addr ia;
ia.s_addr = htonl(haddr);
return (inet_ntoa(ia));
}
#endif
/*
* Restore context from a queued IGMP output chain.
* Return saved ifindex.
*
* VIMAGE: The assertion is there to make sure that we
* actually called CURVNET_SET() with what's in the mbuf chain.
*/
static __inline uint32_t
igmp_restore_context(struct mbuf *m)
{
#ifdef notyet
#if defined(VIMAGE) && defined(INVARIANTS)
KASSERT(curvnet == (m->m_pkthdr.header),
("%s: called when curvnet was not restored", __func__));
#endif
#endif
return (m->m_pkthdr.flowid);
}
/*
* Retrieve or set default IGMP version.
*
* VIMAGE: Assume curvnet set by caller.
* SMPng: NOTE: Serialized by IGMP lock.
*/
static int
sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS)
{
INIT_VNET_INET(curvnet);
int error;
int new;
error = sysctl_wire_old_buffer(req, sizeof(int));
if (error)
return (error);
IGMP_LOCK();
new = V_igmp_default_version;
error = sysctl_handle_int(oidp, &new, 0, req);
if (error || !req->newptr)
goto out_locked;
if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) {
error = EINVAL;
goto out_locked;
}
CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d",
V_igmp_default_version, new);
V_igmp_default_version = new;
out_locked:
IGMP_UNLOCK();
return (error);
}
/*
* Retrieve or set threshold between group-source queries in seconds.
*
* VIMAGE: Assume curvnet set by caller.
* SMPng: NOTE: Serialized by IGMP lock.
*/
static int
sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS)
{
INIT_VNET_INET(curvnet);
int error;
int i;
error = sysctl_wire_old_buffer(req, sizeof(int));
if (error)
return (error);
IGMP_LOCK();
i = V_igmp_gsrdelay.tv_sec;
error = sysctl_handle_int(oidp, &i, 0, req);
if (error || !req->newptr)
goto out_locked;
if (i < -1 || i >= 60) {
error = EINVAL;
goto out_locked;
}
CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d",
V_igmp_gsrdelay.tv_sec, i);
V_igmp_gsrdelay.tv_sec = i;
out_locked:
IGMP_UNLOCK();
return (error);
}
/*
* Expose struct igmp_ifinfo to userland, keyed by ifindex.
* For use by ifmcstat(8).
*
* SMPng: NOTE: Does an unlocked ifindex space read.
* VIMAGE: Assume curvnet set by caller. The node handler itself
* is not directly virtualized.
*/
static int
sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS)
{
INIT_VNET_NET(curvnet);
INIT_VNET_INET(curvnet);
int *name;
int error;
u_int namelen;
struct ifnet *ifp;
struct igmp_ifinfo *igi;
name = (int *)arg1;
namelen = arg2;
if (req->newptr != NULL)
return (EPERM);
if (namelen != 1)
return (EINVAL);
error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo));
if (error)
return (error);
IN_MULTI_LOCK();
IGMP_LOCK();
if (name[0] <= 0 || name[0] > V_if_index) {
error = ENOENT;
goto out_locked;
}
error = ENOENT;
ifp = ifnet_byindex(name[0]);
if (ifp == NULL)
goto out_locked;
LIST_FOREACH(igi, &V_igi_head, igi_link) {
if (ifp == igi->igi_ifp) {
error = SYSCTL_OUT(req, igi,
sizeof(struct igmp_ifinfo));
break;
}
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (error);
}
/*
* Dispatch an entire queue of pending packet chains
* using the netisr.
* VIMAGE: Assumes the vnet pointer has been set.
*/
static void
igmp_dispatch_queue(struct ifqueue *ifq, int limit, const int loop)
{
struct mbuf *m;
for (;;) {
_IF_DEQUEUE(ifq, m);
if (m == NULL)
break;
CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, ifq, m);
if (loop)
m->m_flags |= M_IGMP_LOOP;
netisr_dispatch(NETISR_IGMP, m);
if (--limit == 0)
break;
}
}
/*
* Filter outgoing IGMP report state by group.
*
* Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1).
* If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are
* disabled for all groups in the 224.0.0.0/24 link-local scope. However,
* this may break certain IGMP snooping switches which rely on the old
* report behaviour.
*
* Return zero if the given group is one for which IGMP reports
* should be suppressed, or non-zero if reports should be issued.
*/
static __inline int
igmp_isgroupreported(const struct in_addr addr)
{
INIT_VNET_INET(curvnet);
if (in_allhosts(addr) ||
((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr)))))
return (0);
return (1);
}
/*
* Construct a Router Alert option to use in outgoing packets.
*/
static struct mbuf *
igmp_ra_alloc(void)
{
struct mbuf *m;
struct ipoption *p;
MGET(m, M_DONTWAIT, MT_DATA);
p = mtod(m, struct ipoption *);
p->ipopt_dst.s_addr = INADDR_ANY;
p->ipopt_list[0] = IPOPT_RA; /* Router Alert Option */
p->ipopt_list[1] = 0x04; /* 4 bytes long */
p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */
p->ipopt_list[3] = 0x00; /* pad byte */
m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1];
return (m);
}
/*
* Attach IGMP when PF_INET is attached to an interface.
*/
struct igmp_ifinfo *
igmp_domifattach(struct ifnet *ifp)
{
struct igmp_ifinfo *igi;
CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)",
__func__, ifp, ifp->if_xname);
IGMP_LOCK();
igi = igi_alloc_locked(ifp);
if (!(ifp->if_flags & IFF_MULTICAST))
igi->igi_flags |= IGIF_SILENT;
IGMP_UNLOCK();
return (igi);
}
/*
* VIMAGE: assume curvnet set by caller.
*/
static struct igmp_ifinfo *
igi_alloc_locked(/*const*/ struct ifnet *ifp)
{
INIT_VNET_INET(ifp->if_vnet);
struct igmp_ifinfo *igi;
IGMP_LOCK_ASSERT();
igi = malloc(sizeof(struct igmp_ifinfo), M_IGMP, M_NOWAIT|M_ZERO);
if (igi == NULL)
goto out;
igi->igi_ifp = ifp;
igi->igi_version = V_igmp_default_version;
igi->igi_flags = 0;
igi->igi_rv = IGMP_RV_INIT;
igi->igi_qi = IGMP_QI_INIT;
igi->igi_qri = IGMP_QRI_INIT;
igi->igi_uri = IGMP_URI_INIT;
SLIST_INIT(&igi->igi_relinmhead);
/*
* Responses to general queries are subject to bounds.
*/
IFQ_SET_MAXLEN(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS);
LIST_INSERT_HEAD(&V_igi_head, igi, igi_link);
CTR2(KTR_IGMPV3, "allocate igmp_ifinfo for ifp %p(%s)",
ifp, ifp->if_xname);
out:
return (igi);
}
/*
* 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.
*
* SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK().
* XXX This is also bitten by unlocked ifma_protospec access.
*/
void
igmp_ifdetach(struct ifnet *ifp)
{
struct igmp_ifinfo *igi;
struct ifmultiaddr *ifma;
struct in_multi *inm, *tinm;
CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp,
ifp->if_xname);
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
if (igi->igi_version == IGMP_VERSION_3) {
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
#if 0
KASSERT(ifma->ifma_protospec != NULL,
("%s: ifma_protospec is NULL", __func__));
#endif
inm = (struct in_multi *)ifma->ifma_protospec;
if (inm->inm_state == IGMP_LEAVING_MEMBER) {
SLIST_INSERT_HEAD(&igi->igi_relinmhead,
inm, inm_nrele);
}
inm_clear_recorded(inm);
}
IF_ADDR_UNLOCK(ifp);
/*
* Free the in_multi reference(s) for this IGMP lifecycle.
*/
SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele,
tinm) {
SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele);
inm_release_locked(inm);
}
}
IGMP_UNLOCK();
}
/*
* Hook for domifdetach.
*/
void
igmp_domifdetach(struct ifnet *ifp)
{
struct igmp_ifinfo *igi;
CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)",
__func__, ifp, ifp->if_xname);
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
igi_delete_locked(ifp);
IGMP_UNLOCK();
}
static void
igi_delete_locked(const struct ifnet *ifp)
{
INIT_VNET_INET(ifp->if_vnet);
struct igmp_ifinfo *igi, *tigi;
CTR3(KTR_IGMPV3, "%s: freeing igmp_ifinfo for ifp %p(%s)",
__func__, ifp, ifp->if_xname);
IGMP_LOCK_ASSERT();
LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) {
if (igi->igi_ifp == ifp) {
/*
* Free deferred General Query responses.
*/
_IF_DRAIN(&igi->igi_gq);
LIST_REMOVE(igi, igi_link);
KASSERT(SLIST_EMPTY(&igi->igi_relinmhead),
("%s: there are dangling in_multi references",
__func__));
free(igi, M_IGMP);
return;
}
}
#ifdef INVARIANTS
panic("%s: igmp_ifinfo not found for ifp %p\n", __func__, ifp);
#endif
}
/*
* Process a received IGMPv1 query.
* Return non-zero if the message should be dropped.
*
* VIMAGE: The curvnet pointer is derived from the input ifp.
*/
static int
igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip,
const struct igmp *igmp)
{
INIT_VNET_INET(ifp->if_vnet);
struct ifmultiaddr *ifma;
struct igmp_ifinfo *igi;
struct in_multi *inm;
/*
* IGMPv1 Host Mmembership Queries SHOULD always be addressed to
* 224.0.0.1. They are always treated as General Queries.
* igmp_group is always ignored. Do not drop it as a userland
* daemon may wish to see it.
* XXX SMPng: unlocked increments in igmpstat assumed atomic.
*/
if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) {
IGMPSTAT_INC(igps_rcv_badqueries);
return (0);
}
IGMPSTAT_INC(igps_rcv_gen_queries);
IN_MULTI_LOCK();
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_ifinfo for ifp %p", __func__, ifp));
if (igi->igi_flags & IGIF_LOOPBACK) {
CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)",
ifp, ifp->if_xname);
goto out_locked;
}
/*
* Switch to IGMPv1 host compatibility mode.
*/
igmp_set_version(igi, IGMP_VERSION_1);
CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname);
/*
* Start the timers in all of our group records
* for the interface on which the query arrived,
* except those which are already running.
*/
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
if (inm->inm_timer != 0)
continue;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
inm->inm_state = IGMP_REPORTING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(
IGMP_V1V2_MAX_RI * PR_FASTHZ);
V_current_state_timers_running = 1;
break;
case IGMP_LEAVING_MEMBER:
break;
}
}
IF_ADDR_UNLOCK(ifp);
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (0);
}
/*
* Process a received IGMPv2 general or group-specific query.
*/
static int
igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip,
const struct igmp *igmp)
{
INIT_VNET_INET(ifp->if_vnet);
struct ifmultiaddr *ifma;
struct igmp_ifinfo *igi;
struct in_multi *inm;
int is_general_query;
uint16_t timer;
is_general_query = 0;
/*
* Validate address fields upfront.
* XXX SMPng: unlocked increments in igmpstat assumed atomic.
*/
if (in_nullhost(igmp->igmp_group)) {
/*
* IGMPv2 General Query.
* If this was not sent to the all-hosts group, ignore it.
*/
if (!in_allhosts(ip->ip_dst))
return (0);
IGMPSTAT_INC(igps_rcv_gen_queries);
is_general_query = 1;
} else {
/* IGMPv2 Group-Specific Query. */
IGMPSTAT_INC(igps_rcv_group_queries);
}
IN_MULTI_LOCK();
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_ifinfo for ifp %p", __func__, ifp));
if (igi->igi_flags & IGIF_LOOPBACK) {
CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)",
ifp, ifp->if_xname);
goto out_locked;
}
/*
* Ignore v2 query if in v1 Compatibility Mode.
*/
if (igi->igi_version == IGMP_VERSION_1)
goto out_locked;
igmp_set_version(igi, IGMP_VERSION_2);
timer = igmp->igmp_code * PR_FASTHZ / IGMP_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_IGMPV3, "process v2 general query on ifp %p(%s)",
ifp, ifp->if_xname);
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
igmp_v2_update_group(inm, timer);
}
IF_ADDR_UNLOCK(ifp);
} else {
/*
* Group-specific IGMPv2 query, we need only
* look up the single group to process it.
*/
inm = inm_lookup(ifp, igmp->igmp_group);
if (inm != NULL) {
CTR3(KTR_IGMPV3, "process v2 query %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
igmp_v2_update_group(inm, timer);
}
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (0);
}
/*
* Update the report timer on a group in response to an IGMPv2 query.
*
* If we are becoming the reporting member for this group, start the timer.
* If we already are the reporting member for this group, and timer is
* below the threshold, reset it.
*
* We may be updating the group for the first time since we switched
* to IGMPv3. If we are, then we must clear any recorded source lists,
* and transition to REPORTING state; the group timer is overloaded
* for group and group-source query responses.
*
* Unlike IGMPv3, the delay per group should be jittered
* to avoid bursts of IGMPv2 reports.
*/
static void
igmp_v2_update_group(struct in_multi *inm, const int timer)
{
INIT_VNET_INET(curvnet);
CTR4(KTR_IGMPV3, "%s: %s/%s timer=%d", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname, timer);
IN_MULTI_LOCK_ASSERT();
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
if (inm->inm_timer != 0 &&
inm->inm_timer <= timer) {
CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, "
"skipping.", __func__);
break;
}
/* FALLTHROUGH */
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__);
inm->inm_state = IGMP_REPORTING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 1;
break;
case IGMP_SLEEPING_MEMBER:
CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__);
inm->inm_state = IGMP_AWAKENING_MEMBER;
break;
case IGMP_LEAVING_MEMBER:
break;
}
}
/*
* Process a received IGMPv3 general, group-specific or
* group-and-source-specific query.
* Assumes m has already been pulled up to the full IGMP message length.
* Return 0 if successful, otherwise an appropriate error code is returned.
*/
static int
igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
/*const*/ struct igmpv3 *igmpv3)
{
INIT_VNET_INET(ifp->if_vnet);
struct igmp_ifinfo *igi;
struct in_multi *inm;
int is_general_query;
uint32_t maxresp, nsrc, qqi;
uint16_t timer;
uint8_t qrv;
is_general_query = 0;
CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname);
maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */
if (maxresp >= 128) {
maxresp = IGMP_MANT(igmpv3->igmp_code) <<
(IGMP_EXP(igmpv3->igmp_code) + 3);
}
/*
* Robustness must never be less than 2 for on-wire IGMPv3.
* FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make
* an exception for interfaces whose IGMPv3 state changes
* are redirected to loopback (e.g. MANET).
*/
qrv = IGMP_QRV(igmpv3->igmp_misc);
if (qrv < 2) {
CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__,
qrv, IGMP_RV_INIT);
qrv = IGMP_RV_INIT;
}
qqi = igmpv3->igmp_qqi;
if (qqi >= 128) {
qqi = IGMP_MANT(igmpv3->igmp_qqi) <<
(IGMP_EXP(igmpv3->igmp_qqi) + 3);
}
timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE;
if (timer == 0)
timer = 1;
nsrc = ntohs(igmpv3->igmp_numsrc);
/*
* Validate address fields and versions upfront before
* accepting v3 query.
* XXX SMPng: Unlocked access to igmpstat counters here.
*/
if (in_nullhost(igmpv3->igmp_group)) {
/*
* IGMPv3 General Query.
*
* General Queries SHOULD be directed to 224.0.0.1.
* A general query with a source list has undefined
* behaviour; discard it.
*/
IGMPSTAT_INC(igps_rcv_gen_queries);
if (!in_allhosts(ip->ip_dst) || nsrc > 0) {
IGMPSTAT_INC(igps_rcv_badqueries);
return (0);
}
is_general_query = 1;
} else {
/* Group or group-source specific query. */
if (nsrc == 0)
IGMPSTAT_INC(igps_rcv_group_queries);
else
IGMPSTAT_INC(igps_rcv_gsr_queries);
}
IN_MULTI_LOCK();
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_ifinfo for ifp %p", __func__, ifp));
if (igi->igi_flags & IGIF_LOOPBACK) {
CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)",
ifp, ifp->if_xname);
goto out_locked;
}
/*
* Discard the v3 query if we're in Compatibility Mode.
* The RFC is not obviously worded that hosts need to stay in
* compatibility mode until the Old Version Querier Present
* timer expires.
*/
if (igi->igi_version != IGMP_VERSION_3) {
CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)",
igi->igi_version, ifp, ifp->if_xname);
goto out_locked;
}
igmp_set_version(igi, IGMP_VERSION_3);
igi->igi_rv = qrv;
igi->igi_qi = qqi;
igi->igi_qri = maxresp;
CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi,
maxresp);
if (is_general_query) {
/*
* Schedule a current-state report on this ifp for
* all groups, possibly containing source lists.
* If there is a pending General Query response
* scheduled earlier than the selected delay, do
* not schedule any other reports.
* Otherwise, reset the interface timer.
*/
CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)",
ifp, ifp->if_xname);
if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) {
igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer);
V_interface_timers_running = 1;
}
} else {
/*
* 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 = inm_lookup(ifp, igmpv3->igmp_group);
if (inm == NULL)
goto out_locked;
if (nsrc > 0) {
if (!ratecheck(&inm->inm_lastgsrtv,
&V_igmp_gsrdelay)) {
CTR1(KTR_IGMPV3, "%s: GS query throttled.",
__func__);
IGMPSTAT_INC(igps_drop_gsr_queries);
goto out_locked;
}
}
CTR3(KTR_IGMPV3, "process v3 %s query on ifp %p(%s)",
inet_ntoa(igmpv3->igmp_group), 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 (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer)
igmp_input_v3_group_query(inm, igi, timer, igmpv3);
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (0);
}
/*
* Process a recieved IGMPv3 group-specific or group-and-source-specific
* query.
* Return <0 if any error occured. Currently this is ignored.
*/
static int
igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifinfo *igi,
int timer, /*const*/ struct igmpv3 *igmpv3)
{
INIT_VNET_INET(curvnet);
int retval;
uint16_t nsrc;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
retval = 0;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LEAVING_MEMBER:
return (retval);
break;
case IGMP_REPORTING_MEMBER:
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
break;
}
nsrc = ntohs(igmpv3->igmp_numsrc);
/*
* Deal with group-specific queries upfront.
* If any group query is already pending, purge any recorded
* source-list state if it exists, and schedule a query response
* for this group-specific query.
*/
if (nsrc == 0) {
if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) {
inm_clear_recorded(inm);
timer = min(inm->inm_timer, timer);
}
inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 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->inm_state == IGMP_G_QUERY_PENDING_MEMBER) {
timer = min(inm->inm_timer, timer);
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 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.
* FIXME: Handling source lists larger than 1 mbuf requires that
* we pass the mbuf chain pointer down to this function, and use
* m_getptr() to walk the chain.
*/
if (inm->inm_nsrc > 0) {
const struct in_addr *ap;
int i, nrecorded;
ap = (const struct in_addr *)(igmpv3 + 1);
nrecorded = 0;
for (i = 0; i < nsrc; i++, ap++) {
retval = inm_record_source(inm, ap->s_addr);
if (retval < 0)
break;
nrecorded += retval;
}
if (nrecorded > 0) {
CTR1(KTR_IGMPV3,
"%s: schedule response to SG query", __func__);
inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 1;
}
}
return (retval);
}
/*
* Process a received IGMPv1 host membership report.
*
* NOTE: 0.0.0.0 workaround breaks const correctness.
*/
static int
igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip,
/*const*/ struct igmp *igmp)
{
INIT_VNET_INET(ifp->if_vnet);
struct in_ifaddr *ia;
struct in_multi *inm;
IGMPSTAT_INC(igps_rcv_reports);
if (ifp->if_flags & IFF_LOOPBACK)
return (0);
if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr) ||
!in_hosteq(igmp->igmp_group, ip->ip_dst))) {
IGMPSTAT_INC(igps_rcv_badreports);
return (EINVAL);
}
/*
* RFC 3376, Section 4.2.13, 9.2, 9.3:
* Booting clients may use the source address 0.0.0.0. Some
* IGMP daemons may not know how to use IP_RECVIF to determine
* the interface upon which this message was received.
* Replace 0.0.0.0 with the subnet address if told to do so.
*/
if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) {
IFP_TO_IA(ifp, ia);
if (ia != NULL)
ip->ip_src.s_addr = htonl(ia->ia_subnet);
}
CTR3(KTR_IGMPV3, "process v1 report %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
/*
* IGMPv1 report suppression.
* If we are a member of this group, and our membership should be
* reported, stop our group timer and transition to the 'lazy' state.
*/
IN_MULTI_LOCK();
inm = inm_lookup(ifp, igmp->igmp_group);
if (inm != NULL) {
struct igmp_ifinfo *igi;
igi = inm->inm_igi;
if (igi == NULL) {
KASSERT(igi != NULL,
("%s: no igi for ifp %p", __func__, ifp));
goto out_locked;
}
IGMPSTAT_INC(igps_rcv_ourreports);
/*
* If we are in IGMPv3 host mode, do not allow the
* other host's IGMPv1 report to suppress our reports
* unless explicitly configured to do so.
*/
if (igi->igi_version == IGMP_VERSION_3) {
if (V_igmp_legacysupp)
igmp_v3_suppress_group_record(inm);
goto out_locked;
}
inm->inm_timer = 0;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
CTR3(KTR_IGMPV3,
"report suppressed for %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
case IGMP_SLEEPING_MEMBER:
inm->inm_state = IGMP_SLEEPING_MEMBER;
break;
case IGMP_REPORTING_MEMBER:
CTR3(KTR_IGMPV3,
"report suppressed for %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
if (igi->igi_version == IGMP_VERSION_1)
inm->inm_state = IGMP_LAZY_MEMBER;
else if (igi->igi_version == IGMP_VERSION_2)
inm->inm_state = IGMP_SLEEPING_MEMBER;
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
out_locked:
IN_MULTI_UNLOCK();
return (0);
}
/*
* Process a received IGMPv2 host membership report.
*
* NOTE: 0.0.0.0 workaround breaks const correctness.
*/
static int
igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip,
/*const*/ struct igmp *igmp)
{
INIT_VNET_INET(ifp->if_vnet);
struct in_ifaddr *ia;
struct in_multi *inm;
/*
* Make sure we don't hear our own membership report. Fast
* leave requires knowing that we are the only member of a
* group.
*/
IFP_TO_IA(ifp, ia);
if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr))
return (0);
IGMPSTAT_INC(igps_rcv_reports);
if (ifp->if_flags & IFF_LOOPBACK)
return (0);
if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
!in_hosteq(igmp->igmp_group, ip->ip_dst)) {
IGMPSTAT_INC(igps_rcv_badreports);
return (EINVAL);
}
/*
* RFC 3376, Section 4.2.13, 9.2, 9.3:
* Booting clients may use the source address 0.0.0.0. Some
* IGMP daemons may not know how to use IP_RECVIF to determine
* the interface upon which this message was received.
* Replace 0.0.0.0 with the subnet address if told to do so.
*/
if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) {
if (ia != NULL)
ip->ip_src.s_addr = htonl(ia->ia_subnet);
}
CTR3(KTR_IGMPV3, "process v2 report %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
/*
* IGMPv2 report suppression.
* If we are a member of this group, and our membership should be
* reported, and our group timer is pending or about to be reset,
* stop our group timer by transitioning to the 'lazy' state.
*/
IN_MULTI_LOCK();
inm = inm_lookup(ifp, igmp->igmp_group);
if (inm != NULL) {
struct igmp_ifinfo *igi;
igi = inm->inm_igi;
KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp));
IGMPSTAT_INC(igps_rcv_ourreports);
/*
* If we are in IGMPv3 host mode, do not allow the
* other host's IGMPv1 report to suppress our reports
* unless explicitly configured to do so.
*/
if (igi->igi_version == IGMP_VERSION_3) {
if (V_igmp_legacysupp)
igmp_v3_suppress_group_record(inm);
goto out_locked;
}
inm->inm_timer = 0;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_SLEEPING_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_AWAKENING_MEMBER:
CTR3(KTR_IGMPV3,
"report suppressed for %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
case IGMP_LAZY_MEMBER:
inm->inm_state = IGMP_LAZY_MEMBER;
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
out_locked:
IN_MULTI_UNLOCK();
return (0);
}
void
igmp_input(struct mbuf *m, int off)
{
int iphlen;
struct ifnet *ifp;
struct igmp *igmp;
struct ip *ip;
int igmplen;
int minlen;
int queryver;
CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, m, off);
ifp = m->m_pkthdr.rcvif;
INIT_VNET_INET(ifp->if_vnet);
IGMPSTAT_INC(igps_rcv_total);
ip = mtod(m, struct ip *);
iphlen = off;
igmplen = ip->ip_len;
/*
* Validate lengths.
*/
if (igmplen < IGMP_MINLEN) {
IGMPSTAT_INC(igps_rcv_tooshort);
m_freem(m);
return;
}
/*
* Always pullup to the minimum size for v1/v2 or v3
* to amortize calls to m_pullup().
*/
minlen = iphlen;
if (igmplen >= IGMP_V3_QUERY_MINLEN)
minlen += IGMP_V3_QUERY_MINLEN;
else
minlen += IGMP_MINLEN;
if ((m->m_flags & M_EXT || m->m_len < minlen) &&
(m = m_pullup(m, minlen)) == 0) {
IGMPSTAT_INC(igps_rcv_tooshort);
return;
}
ip = mtod(m, struct ip *);
if (ip->ip_ttl != 1) {
IGMPSTAT_INC(igps_rcv_badttl);
m_freem(m);
return;
}
/*
* Validate checksum.
*/
m->m_data += iphlen;
m->m_len -= iphlen;
igmp = mtod(m, struct igmp *);
if (in_cksum(m, igmplen)) {
IGMPSTAT_INC(igps_rcv_badsum);
m_freem(m);
return;
}
m->m_data -= iphlen;
m->m_len += iphlen;
switch (igmp->igmp_type) {
case IGMP_HOST_MEMBERSHIP_QUERY:
if (igmplen == IGMP_MINLEN) {
if (igmp->igmp_code == 0)
queryver = IGMP_VERSION_1;
else
queryver = IGMP_VERSION_2;
} else if (igmplen >= IGMP_V3_QUERY_MINLEN) {
queryver = IGMP_VERSION_3;
} else {
IGMPSTAT_INC(igps_rcv_tooshort);
m_freem(m);
return;
}
switch (queryver) {
case IGMP_VERSION_1:
IGMPSTAT_INC(igps_rcv_v1v2_queries);
if (!V_igmp_v1enable)
break;
if (igmp_input_v1_query(ifp, ip, igmp) != 0) {
m_freem(m);
return;
}
break;
case IGMP_VERSION_2:
IGMPSTAT_INC(igps_rcv_v1v2_queries);
if (!V_igmp_v2enable)
break;
if (igmp_input_v2_query(ifp, ip, igmp) != 0) {
m_freem(m);
return;
}
break;
case IGMP_VERSION_3: {
struct igmpv3 *igmpv3;
uint16_t igmpv3len;
uint16_t srclen;
int nsrc;
IGMPSTAT_INC(igps_rcv_v3_queries);
igmpv3 = (struct igmpv3 *)igmp;
/*
* Validate length based on source count.
*/
nsrc = ntohs(igmpv3->igmp_numsrc);
srclen = sizeof(struct in_addr) * nsrc;
if (nsrc * sizeof(in_addr_t) > srclen) {
IGMPSTAT_INC(igps_rcv_tooshort);
return;
}
/*
* m_pullup() may modify m, so pullup in
* this scope.
*/
igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN +
srclen;
if ((m->m_flags & M_EXT ||
m->m_len < igmpv3len) &&
(m = m_pullup(m, igmpv3len)) == NULL) {
IGMPSTAT_INC(igps_rcv_tooshort);
return;
}
igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *)
+ iphlen);
if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) {
m_freem(m);
return;
}
}
break;
}
break;
case IGMP_v1_HOST_MEMBERSHIP_REPORT:
if (!V_igmp_v1enable)
break;
if (igmp_input_v1_report(ifp, ip, igmp) != 0) {
m_freem(m);
return;
}
break;
case IGMP_v2_HOST_MEMBERSHIP_REPORT:
if (!V_igmp_v2enable)
break;
if (!ip_checkrouteralert(m))
IGMPSTAT_INC(igps_rcv_nora);
if (igmp_input_v2_report(ifp, ip, igmp) != 0) {
m_freem(m);
return;
}
break;
case IGMP_v3_HOST_MEMBERSHIP_REPORT:
/*
* Hosts do not need to process IGMPv3 membership reports,
* as report suppression is no longer required.
*/
if (!ip_checkrouteralert(m))
IGMPSTAT_INC(igps_rcv_nora);
break;
default:
break;
}
/*
* Pass all valid IGMP packets up to any process(es) listening on a
* raw IGMP socket.
*/
rip_input(m, off);
}
/*
* Fast timeout handler (global).
* VIMAGE: Timeout handlers are expected to service all vimages.
*/
void
igmp_fasttimo(void)
{
VNET_ITERATOR_DECL(vnet_iter);
VNET_LIST_RLOCK();
VNET_FOREACH(vnet_iter) {
CURVNET_SET(vnet_iter);
igmp_fasttimo_vnet();
CURVNET_RESTORE();
}
VNET_LIST_RUNLOCK();
}
/*
* Fast timeout handler (per-vnet).
* Sends are shuffled off to a netisr to deal with Giant.
*
* VIMAGE: Assume caller has set up our curvnet.
*/
static void
igmp_fasttimo_vnet(void)
{
INIT_VNET_INET(curvnet);
struct ifqueue scq; /* State-change packets */
struct ifqueue qrq; /* Query response packets */
struct ifnet *ifp;
struct igmp_ifinfo *igi;
struct ifmultiaddr *ifma, *tifma;
struct in_multi *inm;
int loop, uri_fasthz;
loop = 0;
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_running &&
!V_interface_timers_running &&
!V_state_change_timers_running)
return;
IN_MULTI_LOCK();
IGMP_LOCK();
/*
* IGMPv3 General Query response timer processing.
*/
if (V_interface_timers_running) {
CTR1(KTR_IGMPV3, "%s: interface timers running", __func__);
V_interface_timers_running = 0;
LIST_FOREACH(igi, &V_igi_head, igi_link) {
if (igi->igi_v3_timer == 0) {
/* Do nothing. */
} else if (--igi->igi_v3_timer == 0) {
igmp_v3_dispatch_general_query(igi);
} else {
V_interface_timers_running = 1;
}
}
}
if (!V_current_state_timers_running &&
!V_state_change_timers_running)
goto out_locked;
V_current_state_timers_running = 0;
V_state_change_timers_running = 0;
CTR1(KTR_IGMPV3, "%s: state change timers running", __func__);
/*
* IGMPv1/v2/v3 host report and state-change timer processing.
* Note: Processing a v3 group timer may remove a node.
*/
LIST_FOREACH(igi, &V_igi_head, igi_link) {
ifp = igi->igi_ifp;
if (igi->igi_version == IGMP_VERSION_3) {
loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri *
PR_FASTHZ);
memset(&qrq, 0, sizeof(struct ifqueue));
IFQ_SET_MAXLEN(&qrq, IGMP_MAX_G_GS_PACKETS);
memset(&scq, 0, sizeof(struct ifqueue));
IFQ_SET_MAXLEN(&scq, IGMP_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_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
switch (igi->igi_version) {
case IGMP_VERSION_1:
case IGMP_VERSION_2:
igmp_v1v2_process_group_timer(inm,
igi->igi_version);
break;
case IGMP_VERSION_3:
igmp_v3_process_group_timers(igi, &qrq,
&scq, inm, uri_fasthz);
break;
}
}
IF_ADDR_UNLOCK(ifp);
if (igi->igi_version == IGMP_VERSION_3) {
struct in_multi *tinm;
igmp_dispatch_queue(&qrq, 0, loop);
igmp_dispatch_queue(&scq, 0, loop);
/*
* Free the in_multi reference(s) for this
* IGMP lifecycle.
*/
SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead,
inm_nrele, tinm) {
SLIST_REMOVE_HEAD(&igi->igi_relinmhead,
inm_nrele);
inm_release_locked(inm);
}
}
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
}
/*
* Update host report group timer for IGMPv1/v2.
* Will update the global pending timer flags.
*/
static void
igmp_v1v2_process_group_timer(struct in_multi *inm, const int version)
{
INIT_VNET_INET(curvnet);
int report_timer_expired;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
if (inm->inm_timer == 0) {
report_timer_expired = 0;
} else if (--inm->inm_timer == 0) {
report_timer_expired = 1;
} else {
V_current_state_timers_running = 1;
return;
}
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
if (report_timer_expired) {
inm->inm_state = IGMP_IDLE_MEMBER;
(void)igmp_v1v2_queue_report(inm,
(version == IGMP_VERSION_2) ?
IGMP_v2_HOST_MEMBERSHIP_REPORT :
IGMP_v1_HOST_MEMBERSHIP_REPORT);
}
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
/*
* Update a group's timers for IGMPv3.
* Will update the global pending timer flags.
* Note: Unlocked read from igi.
*/
static void
igmp_v3_process_group_timers(struct igmp_ifinfo *igi,
struct ifqueue *qrq, struct ifqueue *scq,
struct in_multi *inm, const int uri_fasthz)
{
INIT_VNET_INET(curvnet);
int query_response_timer_expired;
int state_change_retransmit_timer_expired;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
query_response_timer_expired = 0;
state_change_retransmit_timer_expired = 0;
/*
* During a transition from v1/v2 compatibility mode back to v3,
* a group record in REPORTING state may still have its group
* timer active. This is a no-op in this function; it is easier
* to deal with it here than to complicate the slow-timeout path.
*/
if (inm->inm_timer == 0) {
query_response_timer_expired = 0;
} else if (--inm->inm_timer == 0) {
query_response_timer_expired = 1;
} else {
V_current_state_timers_running = 1;
}
if (inm->inm_sctimer == 0) {
state_change_retransmit_timer_expired = 0;
} else if (--inm->inm_sctimer == 0) {
state_change_retransmit_timer_expired = 1;
} else {
V_state_change_timers_running = 1;
}
/* We are in fasttimo, so be quick about it. */
if (!state_change_retransmit_timer_expired &&
!query_response_timer_expired)
return;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
case IGMP_IDLE_MEMBER:
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
/*
* Respond to a previously pending Group-Specific
* or Group-and-Source-Specific query by enqueueing
* the appropriate Current-State report for
* immediate transmission.
*/
if (query_response_timer_expired) {
int retval;
retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1,
(inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER));
CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
__func__, retval);
inm->inm_state = IGMP_REPORTING_MEMBER;
/* XXX Clear recorded sources for next time. */
inm_clear_recorded(inm);
}
/* FALLTHROUGH */
case IGMP_REPORTING_MEMBER:
case IGMP_LEAVING_MEMBER:
if (state_change_retransmit_timer_expired) {
/*
* State-change retransmission timer fired.
* If there are any further pending retransmissions,
* set the global pending state-change flag, and
* reset the timer.
*/
if (--inm->inm_scrv > 0) {
inm->inm_sctimer = uri_fasthz;
V_state_change_timers_running = 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)igmp_v3_merge_state_changes(inm, scq);
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
/*
* If we are leaving the group for good, make sure
* we release IGMP's reference to it.
* This release must be deferred using a SLIST,
* as we are called from a loop which traverses
* the in_ifmultiaddr TAILQ.
*/
if (inm->inm_state == IGMP_LEAVING_MEMBER &&
inm->inm_scrv == 0) {
inm->inm_state = IGMP_NOT_MEMBER;
SLIST_INSERT_HEAD(&igi->igi_relinmhead,
inm, inm_nrele);
}
}
break;
}
}
/*
* Suppress a group's pending response to a group or source/group query.
*
* Do NOT suppress state changes. This leads to IGMPv3 inconsistency.
* Do NOT update ST1/ST0 as this operation merely suppresses
* the currently pending group record.
* Do NOT suppress the response to a general query. It is possible but
* it would require adding another state or flag.
*/
static void
igmp_v3_suppress_group_record(struct in_multi *inm)
{
IN_MULTI_LOCK_ASSERT();
KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3,
("%s: not IGMPv3 mode on link", __func__));
if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER ||
inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER)
return;
if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)
inm_clear_recorded(inm);
inm->inm_timer = 0;
inm->inm_state = IGMP_REPORTING_MEMBER;
}
/*
* Switch to a different IGMP version on the given interface,
* as per Section 7.2.1.
*/
static void
igmp_set_version(struct igmp_ifinfo *igi, const int version)
{
int old_version_timer;
IGMP_LOCK_ASSERT();
CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__,
version, igi->igi_ifp, igi->igi_ifp->if_xname);
if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) {
/*
* Compute the "Older Version Querier Present" timer as per
* Section 8.12.
*/
old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri;
old_version_timer *= PR_SLOWHZ;
if (version == IGMP_VERSION_1) {
igi->igi_v1_timer = old_version_timer;
igi->igi_v2_timer = 0;
} else if (version == IGMP_VERSION_2) {
igi->igi_v1_timer = 0;
igi->igi_v2_timer = old_version_timer;
}
}
if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
if (igi->igi_version != IGMP_VERSION_2) {
igi->igi_version = IGMP_VERSION_2;
igmp_v3_cancel_link_timers(igi);
}
} else if (igi->igi_v1_timer > 0) {
if (igi->igi_version != IGMP_VERSION_1) {
igi->igi_version = IGMP_VERSION_1;
igmp_v3_cancel_link_timers(igi);
}
}
}
/*
* Cancel pending IGMPv3 timers for the given link and all groups
* joined on it; state-change, general-query, and group-query timers.
*
* Only ever called on a transition from v3 to Compatibility mode. Kill
* the timers stone dead (this may be expensive for large N groups), they
* will be restarted if Compatibility Mode deems that they must be due to
* query processing.
*/
static void
igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi)
{
struct ifmultiaddr *ifma;
struct ifnet *ifp;
struct in_multi *inm;
CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__,
igi->igi_ifp, igi->igi_ifp->if_xname);
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
/*
* Stop the v3 General Query Response on this link stone dead.
* If fasttimo is woken up due to V_interface_timers_running,
* the flag will be cleared if there are no pending link timers.
*/
igi->igi_v3_timer = 0;
/*
* Now clear the current-state and state-change report timers
* for all memberships scoped to this link.
*/
ifp = igi->igi_ifp;
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
/*
* These states are either not relevant in v3 mode,
* or are unreported. Do nothing.
*/
break;
case IGMP_LEAVING_MEMBER:
/*
* If we are leaving the group and switching to
* compatibility mode, we need to release the final
* reference held for issuing the INCLUDE {}, and
* transition to REPORTING to ensure the host leave
* message is sent upstream to the old querier --
* transition to NOT would lose the leave and race.
*
* SMPNG: Must drop and re-acquire IF_ADDR_LOCK
* around inm_release_locked(), as it is not
* a recursive mutex.
*/
IF_ADDR_UNLOCK(ifp);
inm_release_locked(inm);
IF_ADDR_LOCK(ifp);
/* FALLTHROUGH */
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
inm_clear_recorded(inm);
/* FALLTHROUGH */
case IGMP_REPORTING_MEMBER:
inm->inm_state = IGMP_REPORTING_MEMBER;
break;
}
/*
* Always clear state-change and group report timers.
* Free any pending IGMPv3 state-change records.
*/
inm->inm_sctimer = 0;
inm->inm_timer = 0;
_IF_DRAIN(&inm->inm_scq);
}
IF_ADDR_UNLOCK(ifp);
}
/*
* Update the Older Version Querier Present timers for a link.
* See Section 7.2.1 of RFC 3376.
*/
static void
igmp_v1v2_process_querier_timers(struct igmp_ifinfo *igi)
{
INIT_VNET_INET(curvnet);
IGMP_LOCK_ASSERT();
if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) {
/*
* IGMPv1 and IGMPv2 Querier Present timers expired.
*
* Revert to IGMPv3.
*/
if (igi->igi_version != IGMP_VERSION_3) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_3,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_version = IGMP_VERSION_3;
}
} else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
/*
* IGMPv1 Querier Present timer expired,
* IGMPv2 Querier Present timer running.
* If IGMPv2 was disabled since last timeout,
* revert to IGMPv3.
* If IGMPv2 is enabled, revert to IGMPv2.
*/
if (!V_igmp_v2enable) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_3,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_v2_timer = 0;
igi->igi_version = IGMP_VERSION_3;
} else {
--igi->igi_v2_timer;
if (igi->igi_version != IGMP_VERSION_2) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_2,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_version = IGMP_VERSION_2;
}
}
} else if (igi->igi_v1_timer > 0) {
/*
* IGMPv1 Querier Present timer running.
* Stop IGMPv2 timer if running.
*
* If IGMPv1 was disabled since last timeout,
* revert to IGMPv3.
* If IGMPv1 is enabled, reset IGMPv2 timer if running.
*/
if (!V_igmp_v1enable) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_3,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_v1_timer = 0;
igi->igi_version = IGMP_VERSION_3;
} else {
--igi->igi_v1_timer;
}
if (igi->igi_v2_timer > 0) {
CTR3(KTR_IGMPV3,
"%s: cancel v2 timer on %p(%s)",
__func__, igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_v2_timer = 0;
}
}
}
/*
* Global slowtimo handler.
* VIMAGE: Timeout handlers are expected to service all vimages.
*/
void
igmp_slowtimo(void)
{
VNET_ITERATOR_DECL(vnet_iter);
VNET_LIST_RLOCK();
VNET_FOREACH(vnet_iter) {
CURVNET_SET(vnet_iter);
igmp_slowtimo_vnet();
CURVNET_RESTORE();
}
VNET_LIST_RUNLOCK();
}
/*
* Per-vnet slowtimo handler.
*/
static void
igmp_slowtimo_vnet(void)
{
INIT_VNET_INET(curvnet);
struct igmp_ifinfo *igi;
IGMP_LOCK();
LIST_FOREACH(igi, &V_igi_head, igi_link) {
igmp_v1v2_process_querier_timers(igi);
}
IGMP_UNLOCK();
}
/*
* Dispatch an IGMPv1/v2 host report or leave message.
* These are always small enough to fit inside a single mbuf.
*/
static int
igmp_v1v2_queue_report(struct in_multi *inm, const int type)
{
struct ifnet *ifp;
struct igmp *igmp;
struct ip *ip;
struct mbuf *m;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
ifp = inm->inm_ifp;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return (ENOMEM);
MH_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp));
m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp);
m->m_data += sizeof(struct ip);
m->m_len = sizeof(struct igmp);
igmp = mtod(m, struct igmp *);
igmp->igmp_type = type;
igmp->igmp_code = 0;
igmp->igmp_group = inm->inm_addr;
igmp->igmp_cksum = 0;
igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp));
m->m_data -= sizeof(struct ip);
m->m_len += sizeof(struct ip);
ip = mtod(m, struct ip *);
ip->ip_tos = 0;
ip->ip_len = sizeof(struct ip) + sizeof(struct igmp);
ip->ip_off = 0;
ip->ip_p = IPPROTO_IGMP;
ip->ip_src.s_addr = INADDR_ANY;
if (type == IGMP_HOST_LEAVE_MESSAGE)
ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP);
else
ip->ip_dst = inm->inm_addr;
igmp_save_context(m, ifp);
m->m_flags |= M_IGMPV2;
if (inm->inm_igi->igi_flags & IGIF_LOOPBACK)
m->m_flags |= M_IGMP_LOOP;
CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m);
netisr_dispatch(NETISR_IGMP, m);
return (0);
}
/*
* Process a state change from the upper layer for the given IPv4 group.
*
* Each socket holds a reference on the in_multi in its own ip_moptions.
* The socket layer will have made the necessary updates to.the group
* state, it is now up to IGMP to issue a state change report if there
* has been any change between T0 (when the last state-change was issued)
* and T1 (now).
*
* We use the IGMPv3 state machine at group level. The IGMP module
* however makes the decision as to which IGMP protocol version to speak.
* A state change *from* INCLUDE {} always means an initial join.
* A state change *to* INCLUDE {} always means a final leave.
*
* FUTURE: If IGIF_V3LITE is enabled for this interface, then we can
* save ourselves a bunch of work; any exclusive mode groups need not
* compute source filter lists.
*
* VIMAGE: curvnet should have been set by caller, as this routine
* is called from the socket option handlers.
*/
int
igmp_change_state(struct in_multi *inm)
{
struct igmp_ifinfo *igi;
struct ifnet *ifp;
int error;
IN_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->inm_ifma != NULL, ("%s: no ifma", __func__));
ifp = inm->inm_ifma->ifma_ifp;
if (ifp != NULL) {
/*
* Sanity check that netinet's notion of ifp is the
* same as net's.
*/
KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__));
}
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_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 IGMP
* life cycle for this group.
*/
if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) {
CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__,
inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode);
if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) {
CTR1(KTR_IGMPV3, "%s: initial join", __func__);
error = igmp_initial_join(inm, igi);
goto out_locked;
} else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) {
CTR1(KTR_IGMPV3, "%s: final leave", __func__);
igmp_final_leave(inm, igi);
goto out_locked;
}
} else {
CTR1(KTR_IGMPV3, "%s: filter set change", __func__);
}
error = igmp_handle_state_change(inm, igi);
out_locked:
IGMP_UNLOCK();
return (error);
}
/*
* Perform the initial join for an IGMP group.
*
* When joining a group:
* If the group should have its IGMP traffic suppressed, do nothing.
* IGMPv1 starts sending IGMPv1 host membership reports.
* IGMPv2 starts sending IGMPv2 host membership reports.
* IGMPv3 will schedule an IGMPv3 state-change report containing the
* initial state of the membership.
*/
static int
igmp_initial_join(struct in_multi *inm, struct igmp_ifinfo *igi)
{
INIT_VNET_INET(curvnet);
struct ifnet *ifp;
struct ifqueue *ifq;
int error, retval, syncstates;
CTR4(KTR_IGMPV3, "%s: initial join %s on ifp %p(%s)",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
inm->inm_ifp->if_xname);
error = 0;
syncstates = 1;
ifp = inm->inm_ifp;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__));
/*
* Groups joined on loopback or marked as 'not reported',
* e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and
* are never reported in any IGMP protocol exchanges.
* All other groups enter the appropriate IGMP state machine
* for the version in use on this link.
* A link marked as IGIF_SILENT causes IGMP to be completely
* disabled for the link.
*/
if ((ifp->if_flags & IFF_LOOPBACK) ||
(igi->igi_flags & IGIF_SILENT) ||
!igmp_isgroupreported(inm->inm_addr)) {
CTR1(KTR_IGMPV3,
"%s: not kicking state machine for silent group", __func__);
inm->inm_state = IGMP_SILENT_MEMBER;
inm->inm_timer = 0;
} else {
/*
* Deal with overlapping in_multi lifecycle.
* If this group was LEAVING, then make sure
* we drop the reference we picked up to keep the
* group around for the final INCLUDE {} enqueue.
*/
if (igi->igi_version == IGMP_VERSION_3 &&
inm->inm_state == IGMP_LEAVING_MEMBER)
inm_release_locked(inm);
inm->inm_state = IGMP_REPORTING_MEMBER;
switch (igi->igi_version) {
case IGMP_VERSION_1:
case IGMP_VERSION_2:
inm->inm_state = IGMP_IDLE_MEMBER;
error = igmp_v1v2_queue_report(inm,
(igi->igi_version == IGMP_VERSION_2) ?
IGMP_v2_HOST_MEMBERSHIP_REPORT :
IGMP_v1_HOST_MEMBERSHIP_REPORT);
if (error == 0) {
inm->inm_timer = IGMP_RANDOM_DELAY(
IGMP_V1V2_MAX_RI * PR_FASTHZ);
V_current_state_timers_running = 1;
}
break;
case IGMP_VERSION_3:
/*
* Defer update of T0 to T1, until the first copy
* of the state change has been transmitted.
*/
syncstates = 0;
/*
* Immediately enqueue a State-Change Report for
* this interface, freeing any previous reports.
* Don't kick the timers if there is nothing to do,
* or if an error occurred.
*/
ifq = &inm->inm_scq;
_IF_DRAIN(ifq);
retval = igmp_v3_enqueue_group_record(ifq, inm, 1,
0, 0);
CTR2(KTR_IGMPV3, "%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 igmp_fasttimo (~200ms),
* giving us an opportunity to merge the reports.
*/
if (igi->igi_flags & IGIF_LOOPBACK) {
inm->inm_scrv = 1;
} else {
KASSERT(igi->igi_rv > 1,
("%s: invalid robustness %d", __func__,
igi->igi_rv));
inm->inm_scrv = igi->igi_rv;
}
inm->inm_sctimer = 1;
V_state_change_timers_running = 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) {
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
}
return (error);
}
/*
* Issue an intermediate state change during the IGMP life-cycle.
*/
static int
igmp_handle_state_change(struct in_multi *inm, struct igmp_ifinfo *igi)
{
INIT_VNET_INET(curvnet);
struct ifnet *ifp;
int retval;
CTR4(KTR_IGMPV3, "%s: state change for %s on ifp %p(%s)",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
inm->inm_ifp->if_xname);
ifp = inm->inm_ifp;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__));
if ((ifp->if_flags & IFF_LOOPBACK) ||
(igi->igi_flags & IGIF_SILENT) ||
!igmp_isgroupreported(inm->inm_addr) ||
(igi->igi_version != IGMP_VERSION_3)) {
if (!igmp_isgroupreported(inm->inm_addr)) {
CTR1(KTR_IGMPV3,
"%s: not kicking state machine for silent group", __func__);
}
CTR1(KTR_IGMPV3, "%s: nothing to do", __func__);
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
return (0);
}
_IF_DRAIN(&inm->inm_scq);
retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0);
CTR2(KTR_IGMPV3, "%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->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv);
inm->inm_sctimer = 1;
V_state_change_timers_running = 1;
return (0);
}
/*
* Perform the final leave for an IGMP group.
*
* When leaving a group:
* IGMPv1 does nothing.
* IGMPv2 sends a host leave message, if and only if we are the reporter.
* IGMPv3 enqueues a state-change report containing a transition
* to INCLUDE {} for immediate transmission.
*/
static void
igmp_final_leave(struct in_multi *inm, struct igmp_ifinfo *igi)
{
INIT_VNET_INET(curvnet);
int syncstates;
syncstates = 1;
CTR4(KTR_IGMPV3, "%s: final leave %s on ifp %p(%s)",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
inm->inm_ifp->if_xname);
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_LEAVING_MEMBER:
/* Already leaving or left; do nothing. */
CTR1(KTR_IGMPV3,
"%s: not kicking state machine for silent group", __func__);
break;
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
if (igi->igi_version == IGMP_VERSION_2) {
#ifdef INVARIANTS
if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)
panic("%s: IGMPv3 state reached, not IGMPv3 mode",
__func__);
#endif
igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE);
inm->inm_state = IGMP_NOT_MEMBER;
} else if (igi->igi_version == IGMP_VERSION_3) {
/*
* Stop group timer and all pending reports.
* Immediately enqueue a state-change report
* TO_IN {} to be sent on the next fast timeout,
* giving us an opportunity to merge reports.
*/
_IF_DRAIN(&inm->inm_scq);
inm->inm_timer = 0;
if (igi->igi_flags & IGIF_LOOPBACK) {
inm->inm_scrv = 1;
} else {
inm->inm_scrv = igi->igi_rv;
}
CTR4(KTR_IGMPV3, "%s: Leaving %s/%s with %d "
"pending retransmissions.", __func__,
inet_ntoa(inm->inm_addr),
inm->inm_ifp->if_xname, inm->inm_scrv);
if (inm->inm_scrv == 0) {
inm->inm_state = IGMP_NOT_MEMBER;
inm->inm_sctimer = 0;
} else {
int retval;
inm_acquire_locked(inm);
retval = igmp_v3_enqueue_group_record(
&inm->inm_scq, inm, 1, 0, 0);
KASSERT(retval != 0,
("%s: enqueue record = %d", __func__,
retval));
inm->inm_state = IGMP_LEAVING_MEMBER;
inm->inm_sctimer = 1;
V_state_change_timers_running = 1;
syncstates = 0;
}
break;
}
break;
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
/* Our reports are suppressed; do nothing. */
break;
}
if (syncstates) {
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for %s/%s",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
}
}
/*
* Enqueue an IGMPv3 group record to the given output queue.
*
* XXX This function could do with having the allocation code
* split out, and the multiple-tree-walks coalesced into a single
* routine as has been done in igmp_v3_enqueue_filter_change().
*
* If is_state_change is zero, a current-state record is appended.
* If is_state_change is non-zero, a state-change report is appended.
*
* If is_group_query is non-zero, an mbuf packet chain is allocated.
* If is_group_query is zero, and if there is a packet with free space
* at the tail of the queue, it will be appended to providing there
* is enough free space.
* Otherwise a new mbuf packet chain is allocated.
*
* If is_source_query is non-zero, each source is checked to see if
* it was recorded for a Group-Source query, and will be omitted if
* it is not both in-mode and recorded.
*
* The function will attempt to allocate leading space in the packet
* for the IP/IGMP header to be prepended without fragmenting the chain.
*
* If successful the size of all data appended to the queue is returned,
* otherwise an error code less than zero is returned, or zero if
* no record(s) were appended.
*/
static int
igmp_v3_enqueue_group_record(struct ifqueue *ifq, struct in_multi *inm,
const int is_state_change, const int is_group_query,
const int is_source_query)
{
struct igmp_grouprec ig;
struct igmp_grouprec *pig;
struct ifnet *ifp;
struct ip_msource *ims, *nims;
struct mbuf *m0, *m, *md;
int error, is_filter_list_change;
int minrec0len, m0srcs, msrcs, nbytes, off;
int record_has_sources;
int now;
int type;
in_addr_t naddr;
uint8_t mode;
IN_MULTI_LOCK_ASSERT();
error = 0;
ifp = inm->inm_ifp;
is_filter_list_change = 0;
m = NULL;
m0 = NULL;
m0srcs = 0;
msrcs = 0;
nbytes = 0;
nims = NULL;
record_has_sources = 1;
pig = NULL;
type = IGMP_DO_NOTHING;
mode = inm->inm_st[1].iss_fmode;
/*
* If we did not transition out of ASM mode during t0->t1,
* and there are no source nodes to process, we can skip
* the generation of source records.
*/
if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 &&
inm->inm_nsrc == 0)
record_has_sources = 0;
if (is_state_change) {
/*
* Queue a state change record.
* If the mode did not change, and there are non-ASM
* listeners or source filters present,
* we potentially need to issue two records for the group.
* If we are transitioning to MCAST_UNDEFINED, we need
* not send any sources.
* If there are ASM listeners, and there was no filter
* mode transition of any kind, do nothing.
*/
if (mode != inm->inm_st[0].iss_fmode) {
if (mode == MCAST_EXCLUDE) {
CTR1(KTR_IGMPV3, "%s: change to EXCLUDE",
__func__);
type = IGMP_CHANGE_TO_EXCLUDE_MODE;
} else {
CTR1(KTR_IGMPV3, "%s: change to INCLUDE",
__func__);
type = IGMP_CHANGE_TO_INCLUDE_MODE;
if (mode == MCAST_UNDEFINED)
record_has_sources = 0;
}
} else {
if (record_has_sources) {
is_filter_list_change = 1;
} else {
type = IGMP_DO_NOTHING;
}
}
} else {
/*
* Queue a current state record.
*/
if (mode == MCAST_EXCLUDE) {
type = IGMP_MODE_IS_EXCLUDE;
} else if (mode == MCAST_INCLUDE) {
type = IGMP_MODE_IS_INCLUDE;
KASSERT(inm->inm_st[1].iss_asm == 0,
("%s: inm %p is INCLUDE but ASM count is %d",
__func__, inm, inm->inm_st[1].iss_asm));
}
}
/*
* Generate the filter list changes using a separate function.
*/
if (is_filter_list_change)
return (igmp_v3_enqueue_filter_change(ifq, inm));
if (type == IGMP_DO_NOTHING) {
CTR3(KTR_IGMPV3, "%s: nothing to do for %s/%s",
__func__, inet_ntoa(inm->inm_addr),
inm->inm_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 igmp_grouprec);
if (record_has_sources)
minrec0len += sizeof(in_addr_t);
CTR4(KTR_IGMPV3, "%s: queueing %s for %s/%s", __func__,
igmp_rec_type_to_str(type), inet_ntoa(inm->inm_addr),
inm->inm_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 IP+RA_OPT+IGMP+REPORT.
* Note: Group records for G/GSR query responses MUST be sent
* in their own packet.
*/
m0 = ifq->ifq_tail;
if (!is_group_query &&
m0 != NULL &&
(m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) &&
(m0->m_pkthdr.len + minrec0len) <
(ifp->if_mtu - IGMP_LEADINGSPACE)) {
m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
m = m0;
CTR1(KTR_IGMPV3, "%s: use existing packet", __func__);
} else {
if (_IF_QFULL(ifq)) {
CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__);
return (-ENOMEM);
}
m = NULL;
m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
if (!is_state_change && !is_group_query) {
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m)
m->m_data += IGMP_LEADINGSPACE;
}
if (m == NULL) {
m = m_gethdr(M_DONTWAIT, MT_DATA);
if (m)
MH_ALIGN(m, IGMP_LEADINGSPACE);
}
if (m == NULL)
return (-ENOMEM);
igmp_save_context(m, ifp);
CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__);
}
/*
* Append group record.
* If we have sources, we don't know how many yet.
*/
ig.ig_type = type;
ig.ig_datalen = 0;
ig.ig_numsrc = 0;
ig.ig_group = inm->inm_addr;
if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__);
return (-ENOMEM);
}
nbytes += sizeof(struct igmp_grouprec);
/*
* Append as many sources as will fit in the first packet.
* If we are appending to a new packet, the chain allocation
* may potentially use clusters; use m_getptr() in this case.
* If we are appending to an existing packet, we need to obtain
* a pointer to the group record after m_append(), in case a new
* mbuf was allocated.
* Only append sources which are in-mode at t1. If we are
* transitioning to MCAST_UNDEFINED state on the group, do not
* include source entries.
* Only report recorded sources in our filter set when responding
* to a group-source query.
*/
if (record_has_sources) {
if (m == m0) {
md = m_last(m);
pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) +
md->m_len - nbytes);
} else {
md = m_getptr(m, 0, &off);
pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) +
off);
}
msrcs = 0;
RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) {
CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
inet_ntoa_haddr(ims->ims_haddr));
now = ims_get_mode(inm, ims, 1);
CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now);
if ((now != mode) ||
(now == mode && mode == MCAST_UNDEFINED)) {
CTR1(KTR_IGMPV3, "%s: skip node", __func__);
continue;
}
if (is_source_query && ims->ims_stp == 0) {
CTR1(KTR_IGMPV3, "%s: skip unrecorded node",
__func__);
continue;
}
CTR1(KTR_IGMPV3, "%s: append node", __func__);
naddr = htonl(ims->ims_haddr);
if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.",
__func__);
return (-ENOMEM);
}
nbytes += sizeof(in_addr_t);
++msrcs;
if (msrcs == m0srcs)
break;
}
CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__,
msrcs);
pig->ig_numsrc = htons(msrcs);
nbytes += (msrcs * sizeof(in_addr_t));
}
if (is_source_query && msrcs == 0) {
CTR1(KTR_IGMPV3, "%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_IGMPV3, "%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_IGMPV3, "%s: outbound queue full", __func__);
return (-ENOMEM);
}
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m)
m->m_data += IGMP_LEADINGSPACE;
if (m == NULL) {
m = m_gethdr(M_DONTWAIT, MT_DATA);
if (m)
MH_ALIGN(m, IGMP_LEADINGSPACE);
}
if (m == NULL)
return (-ENOMEM);
igmp_save_context(m, ifp);
md = m_getptr(m, 0, &off);
pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off);
CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__);
if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__);
return (-ENOMEM);
}
m->m_pkthdr.PH_vt.vt_nrecs = 1;
nbytes += sizeof(struct igmp_grouprec);
m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
msrcs = 0;
RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
inet_ntoa_haddr(ims->ims_haddr));
now = ims_get_mode(inm, ims, 1);
if ((now != mode) ||
(now == mode && mode == MCAST_UNDEFINED)) {
CTR1(KTR_IGMPV3, "%s: skip node", __func__);
continue;
}
if (is_source_query && ims->ims_stp == 0) {
CTR1(KTR_IGMPV3, "%s: skip unrecorded node",
__func__);
continue;
}
CTR1(KTR_IGMPV3, "%s: append node", __func__);
naddr = htonl(ims->ims_haddr);
if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.",
__func__);
return (-ENOMEM);
}
++msrcs;
if (msrcs == m0srcs)
break;
}
pig->ig_numsrc = htons(msrcs);
nbytes += (msrcs * sizeof(in_addr_t));
CTR1(KTR_IGMPV3, "%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 IGMPv3 filter list change to the given output queue.
*
* Source list filter state is held in an RB-tree. When the filter list
* for a group is changed without changing its mode, we need to compute
* the deltas between T0 and T1 for each source in the filter set,
* and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records.
*
* As we may potentially queue two record types, and the entire R-B tree
* needs to be walked at once, we break this out into its own function
* so we can generate a tightly packed queue of packets.
*
* XXX This could be written to only use one tree walk, although that makes
* serializing into the mbuf chains a bit harder. For now we do two walks
* which makes things easier on us, and it may or may not be harder on
* the L2 cache.
*
* If successful the size of all data appended to the queue is returned,
* otherwise an error code less than zero is returned, or zero if
* no record(s) were appended.
*/
static int
igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
{
static const int MINRECLEN =
sizeof(struct igmp_grouprec) + sizeof(in_addr_t);
struct ifnet *ifp;
struct igmp_grouprec ig;
struct igmp_grouprec *pig;
struct ip_msource *ims, *nims;
struct mbuf *m, *m0, *md;
in_addr_t naddr;
int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
int nallow, nblock;
uint8_t mode, now, then;
rectype_t crt, drt, nrt;
IN_MULTI_LOCK_ASSERT();
if (inm->inm_nsrc == 0 ||
(inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0))
return (0);
ifp = inm->inm_ifp; /* interface */
mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */
crt = REC_NONE; /* current group record type */
drt = REC_NONE; /* mask of completed group record types */
nrt = REC_NONE; /* record type for current node */
m0srcs = 0; /* # source which will fit in current mbuf chain */
nbytes = 0; /* # of bytes appended to group's state-change queue */
npbytes = 0; /* # of bytes appended this packet */
rsrcs = 0; /* # sources encoded in current record */
schanged = 0; /* # nodes encoded in overall filter change */
nallow = 0; /* # of source entries in ALLOW_NEW */
nblock = 0; /* # of source entries in BLOCK_OLD */
nims = NULL; /* next tree node pointer */
/*
* For each possible filter record mode.
* The first kind of source we encounter tells us which
* is the first kind of record we start appending.
* If a node transitioned to UNDEFINED at t1, its mode is treated
* as the inverse of the group's filter mode.
*/
while (drt != REC_FULL) {
do {
m0 = ifq->ifq_tail;
if (m0 != NULL &&
(m0->m_pkthdr.PH_vt.vt_nrecs + 1 <=
IGMP_V3_REPORT_MAXRECS) &&
(m0->m_pkthdr.len + MINRECLEN) <
(ifp->if_mtu - IGMP_LEADINGSPACE)) {
m = m0;
m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
sizeof(struct igmp_grouprec)) /
sizeof(in_addr_t);
CTR1(KTR_IGMPV3,
"%s: use previous packet", __func__);
} else {
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m)
m->m_data += IGMP_LEADINGSPACE;
if (m == NULL) {
m = m_gethdr(M_DONTWAIT, MT_DATA);
if (m)
MH_ALIGN(m, IGMP_LEADINGSPACE);
}
if (m == NULL) {
CTR1(KTR_IGMPV3,
"%s: m_get*() failed", __func__);
return (-ENOMEM);
}
m->m_pkthdr.PH_vt.vt_nrecs = 0;
igmp_save_context(m, ifp);
m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
sizeof(struct igmp_grouprec)) /
sizeof(in_addr_t);
npbytes = 0;
CTR1(KTR_IGMPV3,
"%s: allocated new packet", __func__);
}
/*
* Append the IGMP group record header to the
* current packet's data area.
* Recalculate pointer to free space for next
* group record, in case m_append() allocated
* a new mbuf or cluster.
*/
memset(&ig, 0, sizeof(ig));
ig.ig_group = inm->inm_addr;
if (!m_append(m, sizeof(ig), (void *)&ig)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3,
"%s: m_append() failed", __func__);
return (-ENOMEM);
}
npbytes += sizeof(struct igmp_grouprec);
if (m != m0) {
/* new packet; offset in c hain */
md = m_getptr(m, npbytes -
sizeof(struct igmp_grouprec), &off);
pig = (struct igmp_grouprec *)(mtod(md,
uint8_t *) + off);
} else {
/* current packet; offset from last append */
md = m_last(m);
pig = (struct igmp_grouprec *)(mtod(md,
uint8_t *) + md->m_len -
sizeof(struct igmp_grouprec));
}
/*
* Begin walking the tree for this record type
* pass, or continue from where we left off
* previously if we had to allocate a new packet.
* Only report deltas in-mode at t1.
* We need not report included sources as allowed
* if we are in inclusive mode on the group,
* however the converse is not true.
*/
rsrcs = 0;
if (nims == NULL)
nims = RB_MIN(ip_msource_tree, &inm->inm_srcs);
RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
CTR2(KTR_IGMPV3, "%s: visit node %s",
__func__, inet_ntoa_haddr(ims->ims_haddr));
now = ims_get_mode(inm, ims, 1);
then = ims_get_mode(inm, ims, 0);
CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d",
__func__, then, now);
if (now == then) {
CTR1(KTR_IGMPV3,
"%s: skip unchanged", __func__);
continue;
}
if (mode == MCAST_EXCLUDE &&
now == MCAST_INCLUDE) {
CTR1(KTR_IGMPV3,
"%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;
naddr = htonl(ims->ims_haddr);
if (!m_append(m, sizeof(in_addr_t),
(void *)&naddr)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3,
"%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 igmp_grouprec);
if (m != m0) {
CTR1(KTR_IGMPV3,
"%s: m_free(m)", __func__);
m_freem(m);
} else {
CTR1(KTR_IGMPV3,
"%s: m_adj(m, -ig)", __func__);
m_adj(m, -((int)sizeof(
struct igmp_grouprec)));
}
continue;
}
npbytes += (rsrcs * sizeof(in_addr_t));
if (crt == REC_ALLOW)
pig->ig_type = IGMP_ALLOW_NEW_SOURCES;
else if (crt == REC_BLOCK)
pig->ig_type = IGMP_BLOCK_OLD_SOURCES;
pig->ig_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_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__,
nallow, nblock);
return (nbytes);
}
static int
igmp_v3_merge_state_changes(struct in_multi *inm, struct ifqueue *ifscq)
{
struct ifqueue *gq;
struct mbuf *m; /* pending state-change */
struct mbuf *m0; /* copy of pending state-change */
struct mbuf *mt; /* last state-change in packet */
int docopy, domerge;
u_int recslen;
docopy = 0;
domerge = 0;
recslen = 0;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
/*
* If there are further pending retransmissions, make a writable
* copy of each queued state-change message before merging.
*/
if (inm->inm_scrv > 0)
docopy = 1;
gq = &inm->inm_scq;
#ifdef KTR
if (gq->ifq_head == NULL) {
CTR2(KTR_IGMPV3, "%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 IGMPv3 report
* packet may only contain 65,535 group records.
* Always use a simple mbuf chain concatentation to do this,
* as large state changes for single groups may have
* allocated clusters.
*/
domerge = 0;
mt = ifscq->ifq_tail;
if (mt != NULL) {
recslen = m_length(m, NULL);
if ((mt->m_pkthdr.PH_vt.vt_nrecs +
m->m_pkthdr.PH_vt.vt_nrecs <=
IGMP_V3_REPORT_MAXRECS) &&
(mt->m_pkthdr.len + recslen <=
(inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE)))
domerge = 1;
}
if (!domerge && _IF_QFULL(gq)) {
CTR2(KTR_IGMPV3,
"%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_IGMPV3, "%s: dequeueing %p", __func__, m);
_IF_DEQUEUE(gq, m0);
m = m0->m_nextpkt;
} else {
CTR2(KTR_IGMPV3, "%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_IGMPV3, "%s: queueing %p to ifscq %p)",
__func__, m0, ifscq);
_IF_ENQUEUE(ifscq, m0);
} else {
struct mbuf *mtl; /* last mbuf of packet mt */
CTR3(KTR_IGMPV3, "%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 IGMPv3 General Query.
*/
static void
igmp_v3_dispatch_general_query(struct igmp_ifinfo *igi)
{
INIT_VNET_INET(curvnet);
struct ifmultiaddr *ifma, *tifma;
struct ifnet *ifp;
struct in_multi *inm;
int retval, loop;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
KASSERT(igi->igi_version == IGMP_VERSION_3,
("%s: called when version %d", __func__, igi->igi_version));
ifp = igi->igi_ifp;
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, tifma) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
KASSERT(ifp == inm->inm_ifp,
("%s: inconsistent ifp", __func__));
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
inm->inm_state = IGMP_REPORTING_MEMBER;
retval = igmp_v3_enqueue_group_record(&igi->igi_gq,
inm, 0, 0, 0);
CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
__func__, retval);
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
IF_ADDR_UNLOCK(ifp);
loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop);
/*
* Slew transmission of bursts over 500ms intervals.
*/
if (igi->igi_gq.ifq_head != NULL) {
igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY(
IGMP_RESPONSE_BURST_INTERVAL);
V_interface_timers_running = 1;
}
}
/*
* Transmit the next pending IGMP message in the output queue.
*
* We get called from netisr_processqueue(). A mutex private to igmpoq
* will be acquired and released around this routine.
*
* VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis.
* MRT: Nothing needs to be done, as IGMP traffic is always local to
* a link and uses a link-scope multicast address.
*/
static void
igmp_intr(struct mbuf *m)
{
struct ip_moptions imo;
struct ifnet *ifp;
struct mbuf *ipopts, *m0;
int error;
uint32_t ifindex;
CTR2(KTR_IGMPV3, "%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.
*/
CURVNET_SET((struct vnet *)(m->m_pkthdr.header));
INIT_VNET_NET(curvnet);
INIT_VNET_INET(curvnet);
ifindex = igmp_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_IGMPV3, "%s: dropped %p as ifindex %u went away.",
__func__, m, ifindex);
m_freem(m);
IPSTAT_INC(ips_noroute);
goto out;
}
ipopts = V_igmp_sendra ? m_raopt : NULL;
imo.imo_multicast_ttl = 1;
imo.imo_multicast_vif = -1;
imo.imo_multicast_loop = (V_ip_mrouter != NULL);
/*
* If the user requested that IGMP traffic be explicitly
* redirected to the loopback interface (e.g. they are running a
* MANET interface and the routing protocol needs to see the
* updates), handle this now.
*/
if (m->m_flags & M_IGMP_LOOP)
imo.imo_multicast_ifp = V_loif;
else
imo.imo_multicast_ifp = ifp;
if (m->m_flags & M_IGMPV2) {
m0 = m;
} else {
m0 = igmp_v3_encap_report(ifp, m);
if (m0 == NULL) {
CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m);
m_freem(m);
IPSTAT_INC(ips_odropped);
goto out;
}
}
igmp_scrub_context(m0);
m->m_flags &= ~(M_PROTOFLAGS);
m0->m_pkthdr.rcvif = V_loif;
#ifdef MAC
mac_netinet_igmp_send(ifp, m0);
#endif
error = ip_output(m0, ipopts, NULL, 0, &imo, NULL);
if (error) {
CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error);
goto out;
}
IGMPSTAT_INC(igps_snd_reports);
out:
/*
* We must restore the existing vnet pointer before
* continuing as we are run from netisr context.
*/
CURVNET_RESTORE();
}
/*
* Encapsulate an IGMPv3 report.
*
* The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf
* chain has already had its IP/IGMPv3 header prepended. In this case
* the function will not attempt to prepend; the lengths and checksums
* will however be re-computed.
*
* Returns a pointer to the new mbuf chain head, or NULL if the
* allocation failed.
*/
static struct mbuf *
igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m)
{
INIT_VNET_INET(curvnet);
struct igmp_report *igmp;
struct ip *ip;
int hdrlen, igmpreclen;
KASSERT((m->m_flags & M_PKTHDR),
("%s: mbuf chain %p is !M_PKTHDR", __func__, m));
igmpreclen = m_length(m, NULL);
hdrlen = sizeof(struct ip) + sizeof(struct igmp_report);
if (m->m_flags & M_IGMPV3_HDR) {
igmpreclen -= hdrlen;
} else {
M_PREPEND(m, hdrlen, M_DONTWAIT);
if (m == NULL)
return (NULL);
m->m_flags |= M_IGMPV3_HDR;
}
CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen);
m->m_data += sizeof(struct ip);
m->m_len -= sizeof(struct ip);
igmp = mtod(m, struct igmp_report *);
igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT;
igmp->ir_rsv1 = 0;
igmp->ir_rsv2 = 0;
igmp->ir_numgrps = htons(m->m_pkthdr.PH_vt.vt_nrecs);
igmp->ir_cksum = 0;
igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen);
m->m_pkthdr.PH_vt.vt_nrecs = 0;
m->m_data -= sizeof(struct ip);
m->m_len += sizeof(struct ip);
ip = mtod(m, struct ip *);
ip->ip_tos = IPTOS_PREC_INTERNETCONTROL;
ip->ip_len = hdrlen + igmpreclen;
ip->ip_off = IP_DF;
ip->ip_p = IPPROTO_IGMP;
ip->ip_sum = 0;
ip->ip_src.s_addr = INADDR_ANY;
if (m->m_flags & M_IGMP_LOOP) {
struct in_ifaddr *ia;
IFP_TO_IA(ifp, ia);
if (ia != NULL)
ip->ip_src = ia->ia_addr.sin_addr;
}
ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP);
return (m);
}
#ifdef KTR
static char *
igmp_rec_type_to_str(const int type)
{
switch (type) {
case IGMP_CHANGE_TO_EXCLUDE_MODE:
return "TO_EX";
break;
case IGMP_CHANGE_TO_INCLUDE_MODE:
return "TO_IN";
break;
case IGMP_MODE_IS_EXCLUDE:
return "MODE_EX";
break;
case IGMP_MODE_IS_INCLUDE:
return "MODE_IN";
break;
case IGMP_ALLOW_NEW_SOURCES:
return "ALLOW_NEW";
break;
case IGMP_BLOCK_OLD_SOURCES:
return "BLOCK_OLD";
break;
default:
break;
}
return "unknown";
}
#endif
static void
igmp_sysinit(void)
{
CTR1(KTR_IGMPV3, "%s: initializing", __func__);
IGMP_LOCK_INIT();
m_raopt = igmp_ra_alloc();
netisr_register(&igmp_nh);
}
static void
igmp_sysuninit(void)
{
CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
netisr_unregister(&igmp_nh);
m_free(m_raopt);
m_raopt = NULL;
IGMP_LOCK_DESTROY();
}
/*
* Initialize an IGMPv3 instance.
* VIMAGE: Assumes curvnet set by caller and called per vimage.
*/
static int
vnet_igmp_iattach(const void *unused __unused)
{
INIT_VNET_INET(curvnet);
CTR1(KTR_IGMPV3, "%s: initializing", __func__);
LIST_INIT(&V_igi_head);
V_current_state_timers_running = 0;
V_state_change_timers_running = 0;
V_interface_timers_running = 0;
/*
* Initialize sysctls to default values.
*/
V_igmp_recvifkludge = 1;
V_igmp_sendra = 1;
V_igmp_sendlocal = 1;
V_igmp_v1enable = 1;
V_igmp_v2enable = 1;
V_igmp_legacysupp = 0;
V_igmp_default_version = IGMP_VERSION_3;
V_igmp_gsrdelay.tv_sec = 10;
V_igmp_gsrdelay.tv_usec = 0;
memset(&V_igmpstat, 0, sizeof(struct igmpstat));
V_igmpstat.igps_version = IGPS_VERSION_3;
V_igmpstat.igps_len = sizeof(struct igmpstat);
return (0);
}
static int
vnet_igmp_idetach(const void *unused __unused)
{
#ifdef INVARIANTS
INIT_VNET_INET(curvnet);
#endif
CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
KASSERT(LIST_EMPTY(&V_igi_head),
("%s: igi list not empty; ifnets not detached?", __func__));
return (0);
}
#ifndef VIMAGE_GLOBALS
static vnet_modinfo_t vnet_igmp_modinfo = {
.vmi_id = VNET_MOD_IGMP,
.vmi_name = "igmp",
.vmi_dependson = VNET_MOD_INET,
.vmi_iattach = vnet_igmp_iattach,
.vmi_idetach = vnet_igmp_idetach
};
#endif
static int
igmp_modevent(module_t mod, int type, void *unused __unused)
{
switch (type) {
case MOD_LOAD:
igmp_sysinit();
#ifndef VIMAGE_GLOBALS
vnet_mod_register(&vnet_igmp_modinfo);
#else
vnet_igmp_iattach(NULL);
#endif
break;
case MOD_UNLOAD:
#ifndef VIMAGE_GLOBALS
vnet_mod_deregister(&vnet_igmp_modinfo);
#else
vnet_igmp_idetach(NULL);
#endif
igmp_sysuninit();
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t igmp_mod = {
"igmp",
igmp_modevent,
0
};
DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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