3650 lines
96 KiB
C
3650 lines
96 KiB
C
/*-
|
|
* 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/ktr.h>
|
|
#include <sys/condvar.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/netisr.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 <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 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 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 */
|
|
static 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.
|
|
*/
|
|
static VNET_DEFINE(int, interface_timers_running); /* IGMPv3 general
|
|
* query response */
|
|
static VNET_DEFINE(int, state_change_timers_running); /* IGMPv3 state-change
|
|
* retransmit */
|
|
static VNET_DEFINE(int, current_state_timers_running); /* IGMPv1/v2 host
|
|
* report; IGMPv3 g/sg
|
|
* query response */
|
|
|
|
#define V_interface_timers_running VNET(interface_timers_running)
|
|
#define V_state_change_timers_running VNET(state_change_timers_running)
|
|
#define V_current_state_timers_running VNET(current_state_timers_running)
|
|
|
|
static VNET_DEFINE(LIST_HEAD(, igmp_ifinfo), igi_head);
|
|
static VNET_DEFINE(struct igmpstat, igmpstat) = {
|
|
.igps_version = IGPS_VERSION_3,
|
|
.igps_len = sizeof(struct igmpstat),
|
|
};
|
|
static VNET_DEFINE(struct timeval, igmp_gsrdelay) = {10, 0};
|
|
|
|
#define V_igi_head VNET(igi_head)
|
|
#define V_igmpstat VNET(igmpstat)
|
|
#define V_igmp_gsrdelay VNET(igmp_gsrdelay)
|
|
|
|
static VNET_DEFINE(int, igmp_recvifkludge) = 1;
|
|
static VNET_DEFINE(int, igmp_sendra) = 1;
|
|
static VNET_DEFINE(int, igmp_sendlocal) = 1;
|
|
static VNET_DEFINE(int, igmp_v1enable) = 1;
|
|
static VNET_DEFINE(int, igmp_v2enable) = 1;
|
|
static VNET_DEFINE(int, igmp_legacysupp);
|
|
static VNET_DEFINE(int, igmp_default_version) = IGMP_VERSION_3;
|
|
|
|
#define V_igmp_recvifkludge VNET(igmp_recvifkludge)
|
|
#define V_igmp_sendra VNET(igmp_sendra)
|
|
#define V_igmp_sendlocal VNET(igmp_sendlocal)
|
|
#define V_igmp_v1enable VNET(igmp_v1enable)
|
|
#define V_igmp_v2enable VNET(igmp_v2enable)
|
|
#define V_igmp_legacysupp VNET(igmp_legacysupp)
|
|
#define V_igmp_default_version VNET(igmp_default_version)
|
|
|
|
/*
|
|
* Virtualized sysctls.
|
|
*/
|
|
SYSCTL_VNET_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_RW,
|
|
&VNET_NAME(igmpstat), igmpstat, "");
|
|
SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_RW,
|
|
&VNET_NAME(igmp_recvifkludge), 0,
|
|
"Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address");
|
|
SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_RW,
|
|
&VNET_NAME(igmp_sendra), 0,
|
|
"Send IP Router Alert option in IGMPv2/v3 messages");
|
|
SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_RW,
|
|
&VNET_NAME(igmp_sendlocal), 0,
|
|
"Send IGMP membership reports for 224.0.0.0/24 groups");
|
|
SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_RW,
|
|
&VNET_NAME(igmp_v1enable), 0,
|
|
"Enable backwards compatibility with IGMPv1");
|
|
SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_RW,
|
|
&VNET_NAME(igmp_v2enable), 0,
|
|
"Enable backwards compatibility with IGMPv2");
|
|
SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_RW,
|
|
&VNET_NAME(igmp_legacysupp), 0,
|
|
"Allow v1/v2 reports to suppress v3 group responses");
|
|
SYSCTL_VNET_PROC(_net_inet_igmp, OID_AUTO, default_version,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
&VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I",
|
|
"Default version of IGMP to run on each interface");
|
|
SYSCTL_VNET_PROC(_net_inet_igmp, OID_AUTO, gsrdelay,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
|
|
&VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I",
|
|
"Rate limit for IGMPv3 Group-and-Source queries in seconds");
|
|
|
|
/*
|
|
* Non-virtualized sysctls.
|
|
*/
|
|
static 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)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
|
|
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)
|
|
{
|
|
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_RLOCK(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_RUNLOCK(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)
|
|
{
|
|
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)
|
|
{
|
|
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_RLOCK(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_RUNLOCK(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)
|
|
{
|
|
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_RLOCK(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_RUNLOCK(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)
|
|
{
|
|
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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);
|
|
ifa_free(&ia->ia_ifa);
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
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)) {
|
|
ifa_free(&ia->ia_ifa);
|
|
return (0);
|
|
}
|
|
|
|
IGMPSTAT_INC(igps_rcv_reports);
|
|
|
|
if (ifp->if_flags & IFF_LOOPBACK) {
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
return (0);
|
|
}
|
|
|
|
if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
|
|
!in_hosteq(igmp->igmp_group, ip->ip_dst)) {
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
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);
|
|
}
|
|
if (ia != NULL)
|
|
ifa_free(&ia->ia_ifa);
|
|
|
|
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;
|
|
|
|
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 *);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* IGMP control traffic is link-scope, and must have a TTL of 1.
|
|
* DVMRP traffic (e.g. mrinfo, mtrace) is an exception;
|
|
* probe packets may come from beyond the LAN.
|
|
*/
|
|
if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) {
|
|
IGMPSTAT_INC(igps_rcv_badttl);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
switch (igmp->igmp_type) {
|
|
case IGMP_HOST_MEMBERSHIP_QUERY:
|
|
if (igmplen == IGMP_MINLEN) {
|
|
if (igmp->igmp_code == 0)
|
|
queryver = IGMP_VERSION_1;
|
|
else
|
|
queryver = IGMP_VERSION_2;
|
|
} else if (igmplen >= IGMP_V3_QUERY_MINLEN) {
|
|
queryver = IGMP_VERSION_3;
|
|
} else {
|
|
IGMPSTAT_INC(igps_rcv_tooshort);
|
|
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_NOSLEEP();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET(vnet_iter);
|
|
igmp_fasttimo_vnet();
|
|
CURVNET_RESTORE();
|
|
}
|
|
VNET_LIST_RUNLOCK_NOSLEEP();
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct ifqueue scq; /* State-change packets */
|
|
struct ifqueue qrq; /* Query response packets */
|
|
struct ifnet *ifp;
|
|
struct igmp_ifinfo *igi;
|
|
struct ifmultiaddr *ifma;
|
|
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_RLOCK(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 (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_RUNLOCK(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)
|
|
{
|
|
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)
|
|
{
|
|
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, *tinm;
|
|
|
|
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_RLOCK(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.
|
|
*/
|
|
SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele);
|
|
/* 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_RUNLOCK(ifp);
|
|
SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele, tinm) {
|
|
SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele);
|
|
inm_release_locked(inm);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
|
|
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_NOSLEEP();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET(vnet_iter);
|
|
igmp_slowtimo_vnet();
|
|
CURVNET_RESTORE();
|
|
}
|
|
VNET_LIST_RUNLOCK_NOSLEEP();
|
|
}
|
|
|
|
/*
|
|
* Per-vnet slowtimo handler.
|
|
*/
|
|
static void
|
|
igmp_slowtimo_vnet(void)
|
|
{
|
|
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;
|
|
/*
|
|
* 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)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
struct ifmultiaddr *ifma;
|
|
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_RLOCK(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;
|
|
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_RUNLOCK(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));
|
|
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)
|
|
{
|
|
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;
|
|
ifa_free(&ia->ia_ifa);
|
|
}
|
|
}
|
|
|
|
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_init(void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_IGMPV3, "%s: initializing", __func__);
|
|
|
|
IGMP_LOCK_INIT();
|
|
|
|
m_raopt = igmp_ra_alloc();
|
|
|
|
netisr_register(&igmp_nh);
|
|
}
|
|
SYSINIT(igmp_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, igmp_init, NULL);
|
|
|
|
static void
|
|
igmp_uninit(void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
|
|
|
|
netisr_unregister(&igmp_nh);
|
|
|
|
m_free(m_raopt);
|
|
m_raopt = NULL;
|
|
|
|
IGMP_LOCK_DESTROY();
|
|
}
|
|
SYSUNINIT(igmp_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, igmp_uninit, NULL);
|
|
|
|
static void
|
|
vnet_igmp_init(const void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_IGMPV3, "%s: initializing", __func__);
|
|
|
|
LIST_INIT(&V_igi_head);
|
|
}
|
|
VNET_SYSINIT(vnet_igmp_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_igmp_init,
|
|
NULL);
|
|
|
|
static void
|
|
vnet_igmp_uninit(const void *unused __unused)
|
|
{
|
|
|
|
CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
|
|
|
|
KASSERT(LIST_EMPTY(&V_igi_head),
|
|
("%s: igi list not empty; ifnets not detached?", __func__));
|
|
}
|
|
VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
|
|
vnet_igmp_uninit, NULL);
|
|
|
|
static int
|
|
igmp_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 igmp_mod = {
|
|
"igmp",
|
|
igmp_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|