/*
- * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-/*
+/*-
+ * Copyright (c) 2007-2009 Bruce Simpson.
* Copyright (c) 1988 Stephen Deering.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
/*
* 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>
+
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
+#include <sys/mcache.h>
+
+#include <libkern/libkern.h>
+#include <kern/zalloc.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/ip_var.h>
#include <netinet/igmp.h>
#include <netinet/igmp_var.h>
+#include <netinet/kpi_ipfilter_var.h>
-#if CONFIG_MACF_NET
-#include <security/mac_framework.h>
-#endif
+SLIST_HEAD(igmp_inm_relhead, in_multi);
-#ifndef __APPLE__
-static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state");
+static void igi_initvar(struct igmp_ifinfo *, struct ifnet *, int);
+static struct igmp_ifinfo *igi_alloc(int);
+static void igi_free(struct igmp_ifinfo *);
+static void igi_delete(const struct ifnet *, struct igmp_inm_relhead *);
+static void igmp_dispatch_queue(struct igmp_ifinfo *, struct ifqueue *,
+ int, const int);
+static void igmp_final_leave(struct in_multi *, struct igmp_ifinfo *,
+ struct igmp_tparams *);
+static int igmp_handle_state_change(struct in_multi *,
+ struct igmp_ifinfo *, struct igmp_tparams *);
+static int igmp_initial_join(struct in_multi *, struct igmp_ifinfo *,
+ struct igmp_tparams *);
+static int igmp_input_v1_query(struct ifnet *, const struct ip *,
+ const struct igmp *);
+static int igmp_input_v2_query(struct ifnet *, const struct ip *,
+ const struct igmp *);
+static int igmp_input_v3_query(struct ifnet *, const struct ip *,
+ /*const*/ struct igmpv3 *);
+static int igmp_input_v3_group_query(struct in_multi *,
+ int, /*const*/ struct igmpv3 *);
+static int igmp_input_v1_report(struct ifnet *, struct mbuf *,
+ /*const*/ struct ip *, /*const*/ struct igmp *);
+static int igmp_input_v2_report(struct ifnet *, struct mbuf *,
+ /*const*/ struct ip *, /*const*/ struct igmp *);
+static void igmp_sendpkt(struct mbuf *);
+static __inline__ int igmp_isgroupreported(const struct in_addr);
+static struct mbuf *igmp_ra_alloc(void);
+#ifdef IGMP_DEBUG
+static const char *igmp_rec_type_to_str(const int);
#endif
+static uint32_t igmp_set_version(struct igmp_ifinfo *, const int);
+static void igmp_flush_relq(struct igmp_ifinfo *,
+ struct igmp_inm_relhead *);
+static int igmp_v1v2_queue_report(struct in_multi *, const int);
+static void igmp_v1v2_process_group_timer(struct in_multi *, const int);
+static void igmp_v1v2_process_querier_timers(struct igmp_ifinfo *);
+static uint32_t igmp_v2_update_group(struct in_multi *, const int);
+static void igmp_v3_cancel_link_timers(struct igmp_ifinfo *);
+static uint32_t igmp_v3_dispatch_general_query(struct igmp_ifinfo *);
+static struct mbuf *
+ igmp_v3_encap_report(struct ifnet *, struct mbuf *);
+static int igmp_v3_enqueue_group_record(struct ifqueue *,
+ struct in_multi *, const int, const int, const int);
+static int igmp_v3_enqueue_filter_change(struct ifqueue *,
+ struct in_multi *);
+static void igmp_v3_process_group_timers(struct igmp_ifinfo *,
+ struct ifqueue *, struct ifqueue *, struct in_multi *,
+ const int);
+static int igmp_v3_merge_state_changes(struct in_multi *,
+ struct ifqueue *);
+static void igmp_v3_suppress_group_record(struct in_multi *);
+static int sysctl_igmp_ifinfo SYSCTL_HANDLER_ARGS;
+static int sysctl_igmp_gsr SYSCTL_HANDLER_ARGS;
+static int sysctl_igmp_default_version SYSCTL_HANDLER_ARGS;
+
+static int igmp_timeout_run; /* IGMP timer is scheduled to run */
+static void igmp_timeout(void *);
+static void igmp_sched_timeout(void);
+
+static struct mbuf *m_raopt; /* Router Alert option */
+
+static int querier_present_timers_running; /* IGMPv1/v2 older version
+ * querier present */
+static int interface_timers_running; /* IGMPv3 general
+ * query response */
+static int state_change_timers_running; /* IGMPv3 state-change
+ * retransmit */
+static int current_state_timers_running; /* IGMPv1/v2 host
+ * report; IGMPv3 g/sg
+ * query response */
+
+/*
+ * Subsystem lock macros.
+ */
+#define IGMP_LOCK() \
+ lck_mtx_lock(&igmp_mtx)
+#define IGMP_LOCK_ASSERT_HELD() \
+ lck_mtx_assert(&igmp_mtx, LCK_MTX_ASSERT_OWNED)
+#define IGMP_LOCK_ASSERT_NOTHELD() \
+ lck_mtx_assert(&igmp_mtx, LCK_MTX_ASSERT_NOTOWNED)
+#define IGMP_UNLOCK() \
+ lck_mtx_unlock(&igmp_mtx)
+
+static LIST_HEAD(, igmp_ifinfo) igi_head;
+static struct igmpstat_v3 igmpstat_v3 = {
+ .igps_version = IGPS_VERSION_3,
+ .igps_len = sizeof(struct igmpstat_v3),
+};
+static struct igmpstat igmpstat; /* old IGMPv2 stats structure */
+static struct timeval igmp_gsrdelay = {10, 0};
+
+static int igmp_recvifkludge = 1;
+static int igmp_sendra = 1;
+static int igmp_sendlocal = 1;
+static int igmp_v1enable = 1;
+static int igmp_v2enable = 1;
+static int igmp_legacysupp = 0;
+static int igmp_default_version = IGMP_VERSION_3;
-static struct router_info *
- find_rti(struct ifnet *ifp, int wait);
+SYSCTL_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_RD | CTLFLAG_LOCKED,
+ &igmpstat, igmpstat, "");
+SYSCTL_STRUCT(_net_inet_igmp, OID_AUTO, v3stats,
+ CTLFLAG_RD | CTLFLAG_LOCKED, &igmpstat_v3, igmpstat_v3, "");
+SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &igmp_recvifkludge, 0,
+ "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address");
+SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &igmp_sendra, 0,
+ "Send IP Router Alert option in IGMPv2/v3 messages");
+SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &igmp_sendlocal, 0,
+ "Send IGMP membership reports for 224.0.0.0/24 groups");
+SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &igmp_v1enable, 0,
+ "Enable backwards compatibility with IGMPv1");
+SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &igmp_v2enable, 0,
+ "Enable backwards compatibility with IGMPv2");
+SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &igmp_legacysupp, 0,
+ "Allow v1/v2 reports to suppress v3 group responses");
+SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version,
+ CTLTYPE_INT | CTLFLAG_RW,
+ &igmp_default_version, 0, sysctl_igmp_default_version, "I",
+ "Default version of IGMP to run on each interface");
+SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay,
+ CTLTYPE_INT | CTLFLAG_RW,
+ &igmp_gsrdelay.tv_sec, 0, sysctl_igmp_gsr, "I",
+ "Rate limit for IGMPv3 Group-and-Source queries in seconds");
+#ifdef IGMP_DEBUG
+int igmp_debug = 0;
+SYSCTL_INT(_net_inet_igmp, OID_AUTO,
+ debug, CTLFLAG_RW | CTLFLAG_LOCKED, &igmp_debug, 0, "");
+#endif
-static struct igmpstat igmpstat;
+SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, CTLFLAG_RD | CTLFLAG_LOCKED,
+ sysctl_igmp_ifinfo, "Per-interface IGMPv3 state");
-SYSCTL_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_RD,
- &igmpstat, igmpstat, "");
+/* Lock group and attribute for igmp_mtx */
+static lck_attr_t *igmp_mtx_attr;
+static lck_grp_t *igmp_mtx_grp;
+static lck_grp_attr_t *igmp_mtx_grp_attr;
+/*
+ * Locking and reference counting:
+ *
+ * igmp_mtx mainly protects igi_head. In cases where both igmp_mtx and
+ * in_multihead_lock must be held, the former must be acquired first in order
+ * to maintain lock ordering. It is not a requirement that igmp_mtx be
+ * acquired first before in_multihead_lock, but in case both must be acquired
+ * in succession, the correct lock ordering must be followed.
+ *
+ * Instead of walking the if_multiaddrs list at the interface and returning
+ * the ifma_protospec value of a matching entry, we search the global list
+ * of in_multi records and find it that way; this is done with in_multihead
+ * lock held. Doing so avoids the race condition issues that many other BSDs
+ * suffer from (therefore in our implementation, ifma_protospec will never be
+ * NULL for as long as the in_multi is valid.)
+ *
+ * The above creates a requirement for the in_multi to stay in in_multihead
+ * list even after the final IGMP leave (in IGMPv3 mode) until no longer needs
+ * be retransmitted (this is not required for IGMPv1/v2.) In order to handle
+ * this, the request and reference counts of the in_multi are bumped up when
+ * the state changes to IGMP_LEAVING_MEMBER, and later dropped in the timeout
+ * handler. Each in_multi holds a reference to the underlying igmp_ifinfo.
+ *
+ * Thus, the permitted lock oder is:
+ *
+ * igmp_mtx, in_multihead_lock, inm_lock, igi_lock
+ *
+ * Any may be taken independently, but if any are held at the same time,
+ * the above lock order must be followed.
+ */
+static decl_lck_mtx_data(, igmp_mtx);
static int igmp_timers_are_running;
-static uint32_t igmp_all_hosts_group;
-static uint32_t igmp_all_rtrs_group;
-static struct mbuf *router_alert;
-static struct router_info *Head;
-static void igmp_sendpkt(struct in_multi *, int, uint32_t);
+#define IGMP_ADD_DETACHED_INM(_head, _inm) { \
+ SLIST_INSERT_HEAD(_head, _inm, inm_dtle); \
+}
-void
-igmp_init(void)
-{
- struct ipoption *ra;
+#define IGMP_REMOVE_DETACHED_INM(_head) { \
+ struct in_multi *_inm, *_inm_tmp; \
+ SLIST_FOREACH_SAFE(_inm, _head, inm_dtle, _inm_tmp) { \
+ SLIST_REMOVE(_head, _inm, in_multi, inm_dtle); \
+ INM_REMREF(_inm); \
+ } \
+ VERIFY(SLIST_EMPTY(_head)); \
+}
- /*
- * To avoid byte-swapping the same value over and over again.
- */
- igmp_all_hosts_group = htonl(INADDR_ALLHOSTS_GROUP);
- igmp_all_rtrs_group = htonl(INADDR_ALLRTRS_GROUP);
+#define IGI_ZONE_MAX 64 /* maximum elements in zone */
+#define IGI_ZONE_NAME "igmp_ifinfo" /* zone name */
- igmp_timers_are_running = 0;
+static unsigned int igi_size; /* size of zone element */
+static struct zone *igi_zone; /* zone for igmp_ifinfo */
- /*
- * Construct a Router Alert option to use in outgoing packets
- */
- MGET(router_alert, M_WAIT, MT_DATA);
- ra = mtod(router_alert, struct ipoption *);
- ra->ipopt_dst.s_addr = 0;
- ra->ipopt_list[0] = IPOPT_RA; /* Router Alert Option */
- ra->ipopt_list[1] = 0x04; /* 4 bytes long */
- ra->ipopt_list[2] = 0x00;
- ra->ipopt_list[3] = 0x00;
- router_alert->m_len = sizeof(ra->ipopt_dst) + ra->ipopt_list[1];
+/* Store IGMPv3 record count in the module private scratch space */
+#define vt_nrecs pkt_mpriv.__mpriv_u.__mpriv32[0].__mpriv32_u.__val16[0]
- Head = (struct router_info *) 0;
+static __inline void
+igmp_save_context(struct mbuf *m, struct ifnet *ifp)
+{
+ m->m_pkthdr.rcvif = ifp;
}
-static struct router_info *
-find_rti(
- struct ifnet *ifp, int wait)
+static __inline void
+igmp_scrub_context(struct mbuf *m)
{
- struct router_info *rti = Head;
-
-
-#if IGMP_DEBUG
- printf("[igmp.c, _find_rti] --> entering \n");
-#endif
- while (rti) {
- if (rti->rti_ifp == ifp) {
-#if IGMP_DEBUG
- printf("[igmp.c, _find_rti] --> found old entry \n");
-#endif
- return rti;
- }
- rti = rti->rti_next;
- }
-
- MALLOC(rti, struct router_info *, sizeof *rti, M_IGMP, wait);
- if (rti != NULL)
- {
- rti->rti_ifp = ifp;
- rti->rti_type = IGMP_V2_ROUTER;
- rti->rti_time = 0;
- rti->rti_next = Head;
- Head = rti;
- }
-#if IGMP_DEBUG
- if (rti) printf("[igmp.c, _find_rti] --> created an entry \n");
+ m->m_pkthdr.rcvif = NULL;
+}
+
+#ifdef IGMP_DEBUG
+static __inline const char *
+inet_ntop_haddr(in_addr_t haddr, char *buf, socklen_t size)
+{
+ struct in_addr ia;
+
+ ia.s_addr = htonl(haddr);
+ return (inet_ntop(AF_INET, &ia, buf, size));
+}
#endif
- return rti;
+
+/*
+ * Restore context from a queued IGMP output chain.
+ * Return saved ifp.
+ */
+static __inline struct ifnet *
+igmp_restore_context(struct mbuf *m)
+{
+ return (m->m_pkthdr.rcvif);
}
-void
-igmp_input(
- struct mbuf *m,
- int iphlen)
+/*
+ * Retrieve or set default IGMP version.
+ */
+static int
+sysctl_igmp_default_version SYSCTL_HANDLER_ARGS
{
- struct igmp *igmp;
- struct ip *ip;
- int igmplen;
- struct ifnet *ifp = m->m_pkthdr.rcvif;
- int minlen;
- struct in_multi *inm;
- struct in_ifaddr *ia;
- struct in_multistep step;
- struct router_info *rti;
-
- int timer; /** timer value in the igmp query header **/
+#pragma unused(oidp, arg2)
+ int error;
+ int new;
- ++igmpstat.igps_rcv_total;
+ IGMP_LOCK();
- ip = mtod(m, struct ip *);
- igmplen = ip->ip_len;
+ error = SYSCTL_OUT(req, arg1, sizeof(int));
+ if (error || !req->newptr)
+ goto out_locked;
- /*
- * Validate lengths
- */
- if (igmplen < IGMP_MINLEN) {
- ++igmpstat.igps_rcv_tooshort;
- m_freem(m);
- return;
- }
- minlen = iphlen + IGMP_MINLEN;
- if ((m->m_flags & M_EXT || m->m_len < minlen) &&
- (m = m_pullup(m, minlen)) == 0) {
- ++igmpstat.igps_rcv_tooshort;
- return;
- }
+ new = igmp_default_version;
- /*
- * Validate checksum
- */
- m->m_data += iphlen;
- m->m_len -= iphlen;
- igmp = mtod(m, struct igmp *);
- if (in_cksum(m, igmplen)) {
- ++igmpstat.igps_rcv_badsum;
- m_freem(m);
- return;
- }
- m->m_data -= iphlen;
- m->m_len += iphlen;
+ error = SYSCTL_IN(req, &new, sizeof(int));
+ if (error)
+ goto out_locked;
- ip = mtod(m, struct ip *);
- timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE;
- if (timer == 0)
- timer = 1;
- rti = find_rti(ifp, M_NOWAIT);
- if (rti == NULL) {
- m_freem(m);
- return;
+ if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) {
+ error = EINVAL;
+ goto out_locked;
}
- /*
- * In the IGMPv2 specification, there are 3 states and a flag.
- *
- * In Non-Member state, we simply don't have a membership record.
- * In Delaying Member state, our timer is running (inm->inm_timer)
- * In Idle Member state, our timer is not running (inm->inm_timer==0)
- *
- * The flag is inm->inm_state, it is set to IGMP_OTHERMEMBER if
- * we have heard a report from another member, or IGMP_IREPORTEDLAST
- * if I sent the last report.
- */
- switch (igmp->igmp_type) {
+ IGMP_PRINTF(("%s: change igmp_default_version from %d to %d\n",
+ __func__, igmp_default_version, new));
- case IGMP_MEMBERSHIP_QUERY:
- ++igmpstat.igps_rcv_queries;
+ igmp_default_version = new;
- if (ifp->if_flags & IFF_LOOPBACK)
- break;
+out_locked:
+ IGMP_UNLOCK();
+ return (error);
+}
- if (igmp->igmp_code == 0) {
- /*
- * Old router. Remember that the querier on this
- * interface is old, and set the timer to the
- * value in RFC 1112.
- */
+/*
+ * Retrieve or set threshold between group-source queries in seconds.
+ *
+ */
+static int
+sysctl_igmp_gsr SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error;
+ int i;
- rti->rti_type = IGMP_V1_ROUTER;
- rti->rti_time = 0;
+ IGMP_LOCK();
- timer = IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ;
+ i = igmp_gsrdelay.tv_sec;
- if (ip->ip_dst.s_addr != igmp_all_hosts_group ||
- igmp->igmp_group.s_addr != 0) {
- ++igmpstat.igps_rcv_badqueries;
- m_freem(m);
- return;
- }
- } else {
- /*
- * New router. Simply do the new validity check.
- */
-
- if (igmp->igmp_group.s_addr != 0 &&
- !IN_MULTICAST(ntohl(igmp->igmp_group.s_addr))) {
- ++igmpstat.igps_rcv_badqueries;
- m_freem(m);
- return;
- }
- }
+ error = sysctl_handle_int(oidp, &i, 0, req);
+ if (error || !req->newptr)
+ goto out_locked;
- /*
- * - Start the timers in all of our membership records
- * that the query applies to for the interface on
- * which the query arrived excl. those that belong
- * to the "all-hosts" group (224.0.0.1).
- * - Restart any timer that is already running but has
- * a value longer than the requested timeout.
- * - Use the value specified in the query message as
- * the maximum timeout.
- */
- lck_mtx_lock(rnh_lock);
- IN_FIRST_MULTI(step, inm);
- while (inm != NULL) {
- if (inm->inm_ifp == ifp &&
- inm->inm_addr.s_addr != igmp_all_hosts_group &&
- (igmp->igmp_group.s_addr == 0 ||
- igmp->igmp_group.s_addr == inm->inm_addr.s_addr)) {
- if (inm->inm_timer == 0 ||
- inm->inm_timer > timer) {
- inm->inm_timer =
- IGMP_RANDOM_DELAY(timer);
- igmp_timers_are_running = 1;
- }
- }
- IN_NEXT_MULTI(step, inm);
- }
- lck_mtx_unlock(rnh_lock);
+ if (i < -1 || i >= 60) {
+ error = EINVAL;
+ goto out_locked;
+ }
- break;
+ igmp_gsrdelay.tv_sec = i;
- case IGMP_V1_MEMBERSHIP_REPORT:
- case IGMP_V2_MEMBERSHIP_REPORT:
- /*
- * For fast leave to work, we have to know that we are the
- * last person to send a report for this group. Reports
- * can potentially get looped back if we are a multicast
- * router, so discard reports sourced by me.
- */
- IFP_TO_IA(ifp, ia);
- if (ia && ip->ip_src.s_addr == IA_SIN(ia)->sin_addr.s_addr) {
- ifafree(&ia->ia_ifa);
- break;
- }
+out_locked:
+ IGMP_UNLOCK();
+ return (error);
+}
- ++igmpstat.igps_rcv_reports;
+/*
+ * Expose struct igmp_ifinfo to userland, keyed by ifindex.
+ * For use by ifmcstat(8).
+ *
+ */
+static int
+sysctl_igmp_ifinfo SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp)
+ int *name;
+ int error;
+ u_int namelen;
+ struct ifnet *ifp;
+ struct igmp_ifinfo *igi;
+ struct igmp_ifinfo_u igi_u;
- if (ifp->if_flags & IFF_LOOPBACK) {
- if (ia != NULL)
- ifafree(&ia->ia_ifa);
- break;
- }
+ name = (int *)arg1;
+ namelen = arg2;
- if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr))) {
- ++igmpstat.igps_rcv_badreports;
- m_freem(m);
- if (ia != NULL)
- ifafree(&ia->ia_ifa);
- return;
- }
+ if (req->newptr != USER_ADDR_NULL)
+ return (EPERM);
- /*
- * KLUDGE: if the IP source address of the report has an
- * unspecified (i.e., zero) subnet number, as is allowed for
- * a booting host, replace it with the correct subnet number
- * so that a process-level multicast routing demon can
- * determine which subnet it arrived from. This is necessary
- * to compensate for the lack of any way for a process to
- * determine the arrival interface of an incoming packet.
- */
- if ((ntohl(ip->ip_src.s_addr) & IN_CLASSA_NET) == 0)
- if (ia) ip->ip_src.s_addr = htonl(ia->ia_subnet);
+ if (namelen != 1)
+ return (EINVAL);
- /*
- * If we belong to the group being reported, stop
- * our timer for that group.
- */
- ifnet_lock_shared(ifp);
- IN_LOOKUP_MULTI(igmp->igmp_group, ifp, inm);
- ifnet_lock_done(ifp);
+ IGMP_LOCK();
- if (inm != NULL) {
- inm->inm_timer = 0;
- ++igmpstat.igps_rcv_ourreports;
+ if (name[0] <= 0 || name[0] > (u_int)if_index) {
+ error = ENOENT;
+ goto out_locked;
+ }
+
+ error = ENOENT;
+
+ ifnet_head_lock_shared();
+ ifp = ifindex2ifnet[name[0]];
+ ifnet_head_done();
+ if (ifp == NULL)
+ goto out_locked;
- inm->inm_state = IGMP_OTHERMEMBER;
+ bzero(&igi_u, sizeof (igi_u));
+
+ LIST_FOREACH(igi, &igi_head, igi_link) {
+ IGI_LOCK(igi);
+ if (ifp != igi->igi_ifp) {
+ IGI_UNLOCK(igi);
+ continue;
}
+ igi_u.igi_ifindex = igi->igi_ifp->if_index;
+ igi_u.igi_version = igi->igi_version;
+ igi_u.igi_v1_timer = igi->igi_v1_timer;
+ igi_u.igi_v2_timer = igi->igi_v2_timer;
+ igi_u.igi_v3_timer = igi->igi_v3_timer;
+ igi_u.igi_flags = igi->igi_flags;
+ igi_u.igi_rv = igi->igi_rv;
+ igi_u.igi_qi = igi->igi_qi;
+ igi_u.igi_qri = igi->igi_qri;
+ igi_u.igi_uri = igi->igi_uri;
+ IGI_UNLOCK(igi);
- if (ia != NULL)
- ifafree(&ia->ia_ifa);
+ error = SYSCTL_OUT(req, &igi_u, sizeof (igi_u));
break;
}
- /*
- * Pass all valid IGMP packets up to any process(es) listening
- * on a raw IGMP socket.
- */
- rip_input(m, iphlen);
+out_locked:
+ IGMP_UNLOCK();
+ return (error);
}
-int
-igmp_joingroup(struct in_multi *inm)
+/*
+ * Dispatch an entire queue of pending packet chains
+ *
+ * Must not be called with inm_lock held.
+ */
+static void
+igmp_dispatch_queue(struct igmp_ifinfo *igi, struct ifqueue *ifq, int limit,
+ const int loop)
{
+ struct mbuf *m;
+ struct ip *ip;
- if (inm->inm_addr.s_addr == igmp_all_hosts_group
- || inm->inm_ifp->if_flags & IFF_LOOPBACK) {
- inm->inm_timer = 0;
- inm->inm_state = IGMP_OTHERMEMBER;
- } else {
- inm->inm_rti = find_rti(inm->inm_ifp, M_WAITOK);
- if (inm->inm_rti == NULL) return ENOMEM;
- igmp_sendpkt(inm, inm->inm_rti->rti_type, 0);
- inm->inm_timer = IGMP_RANDOM_DELAY(
- IGMP_MAX_HOST_REPORT_DELAY*PR_FASTHZ);
- inm->inm_state = IGMP_IREPORTEDLAST;
- igmp_timers_are_running = 1;
+ if (igi != NULL)
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ for (;;) {
+ IF_DEQUEUE(ifq, m);
+ if (m == NULL)
+ break;
+ IGMP_PRINTF(("%s: dispatch 0x%llx from 0x%llx\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifq),
+ (uint64_t)VM_KERNEL_ADDRPERM(m)));
+ ip = mtod(m, struct ip *);
+ if (loop)
+ m->m_flags |= M_IGMP_LOOP;
+ if (igi != NULL)
+ IGI_UNLOCK(igi);
+ igmp_sendpkt(m);
+ if (igi != NULL)
+ IGI_LOCK(igi);
+ if (--limit == 0)
+ break;
}
- return 0;
+
+ if (igi != NULL)
+ IGI_LOCK_ASSERT_HELD(igi);
+}
+
+/*
+ * Filter outgoing IGMP report state by group.
+ *
+ * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1).
+ * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are
+ * disabled for all groups in the 224.0.0.0/24 link-local scope. However,
+ * this may break certain IGMP snooping switches which rely on the old
+ * report behaviour.
+ *
+ * Return zero if the given group is one for which IGMP reports
+ * should be suppressed, or non-zero if reports should be issued.
+ */
+
+static __inline__
+int igmp_isgroupreported(const struct in_addr addr)
+{
+
+ if (in_allhosts(addr) ||
+ ((!igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr)))))
+ return (0);
+
+ return (1);
+}
+
+/*
+ * Construct a Router Alert option to use in outgoing packets.
+ */
+static struct mbuf *
+igmp_ra_alloc(void)
+{
+ struct mbuf *m;
+ struct ipoption *p;
+
+ MGET(m, M_WAITOK, MT_DATA);
+ p = mtod(m, struct ipoption *);
+ p->ipopt_dst.s_addr = INADDR_ANY;
+ p->ipopt_list[0] = IPOPT_RA; /* Router Alert Option */
+ p->ipopt_list[1] = 0x04; /* 4 bytes long */
+ p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */
+ p->ipopt_list[3] = 0x00; /* pad byte */
+ m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1];
+
+ return (m);
+}
+
+/*
+ * Attach IGMP when PF_INET is attached to an interface.
+ */
+struct igmp_ifinfo *
+igmp_domifattach(struct ifnet *ifp, int how)
+{
+ struct igmp_ifinfo *igi;
+
+ IGMP_PRINTF(("%s: called for ifp 0x%llx(%s)\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name));
+
+ igi = igi_alloc(how);
+ if (igi == NULL)
+ return (NULL);
+
+ IGMP_LOCK();
+
+ IGI_LOCK(igi);
+ igi_initvar(igi, ifp, 0);
+ igi->igi_debug |= IFD_ATTACHED;
+ IGI_ADDREF_LOCKED(igi); /* hold a reference for igi_head */
+ IGI_ADDREF_LOCKED(igi); /* hold a reference for caller */
+ IGI_UNLOCK(igi);
+ ifnet_lock_shared(ifp);
+ igmp_initsilent(ifp, igi);
+ ifnet_lock_done(ifp);
+
+ LIST_INSERT_HEAD(&igi_head, igi, igi_link);
+
+ IGMP_UNLOCK();
+
+ IGMP_PRINTF(("%s: allocate igmp_ifinfo for ifp 0x%llx(%s)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name));
+
+ return (igi);
}
+/*
+ * Attach IGMP when PF_INET is reattached to an interface. Caller is
+ * expected to have an outstanding reference to the igi.
+ */
void
-igmp_leavegroup(struct in_multi *inm)
+igmp_domifreattach(struct igmp_ifinfo *igi)
{
- if (inm->inm_state == IGMP_IREPORTEDLAST &&
- inm->inm_addr.s_addr != igmp_all_hosts_group &&
- !(inm->inm_ifp->if_flags & IFF_LOOPBACK) &&
- inm->inm_rti->rti_type != IGMP_V1_ROUTER)
- igmp_sendpkt(inm, IGMP_V2_LEAVE_GROUP, igmp_all_rtrs_group);
+ struct ifnet *ifp;
+
+ IGMP_LOCK();
+
+ IGI_LOCK(igi);
+ VERIFY(!(igi->igi_debug & IFD_ATTACHED));
+ ifp = igi->igi_ifp;
+ VERIFY(ifp != NULL);
+ igi_initvar(igi, ifp, 1);
+ igi->igi_debug |= IFD_ATTACHED;
+ IGI_ADDREF_LOCKED(igi); /* hold a reference for igi_head */
+ IGI_UNLOCK(igi);
+ ifnet_lock_shared(ifp);
+ igmp_initsilent(ifp, igi);
+ ifnet_lock_done(ifp);
+
+ LIST_INSERT_HEAD(&igi_head, igi, igi_link);
+
+ IGMP_UNLOCK();
+
+ IGMP_PRINTF(("%s: reattached igmp_ifinfo for ifp 0x%llx(%s)\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name));
}
+/*
+ * Hook for domifdetach.
+ */
void
-igmp_fasttimo(void)
+igmp_domifdetach(struct ifnet *ifp)
{
- struct in_multi *inm;
- struct in_multistep step;
+ SLIST_HEAD(, in_multi) inm_dthead;
+
+ SLIST_INIT(&inm_dthead);
+
+ IGMP_PRINTF(("%s: called for ifp 0x%llx(%s%d)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), ifp->if_name, ifp->if_unit));
+
+ IGMP_LOCK();
+ igi_delete(ifp, (struct igmp_inm_relhead *)&inm_dthead);
+ IGMP_UNLOCK();
+
+ /* Now that we're dropped all locks, release detached records */
+ IGMP_REMOVE_DETACHED_INM(&inm_dthead);
+}
+
+/*
+ * Called at interface detach time. Note that we only flush all deferred
+ * responses and record releases; all remaining inm records and their source
+ * entries related to this interface are left intact, in order to handle
+ * the reattach case.
+ */
+static void
+igi_delete(const struct ifnet *ifp, struct igmp_inm_relhead *inm_dthead)
+{
+ struct igmp_ifinfo *igi, *tigi;
+
+ IGMP_LOCK_ASSERT_HELD();
+
+ LIST_FOREACH_SAFE(igi, &igi_head, igi_link, tigi) {
+ IGI_LOCK(igi);
+ if (igi->igi_ifp == ifp) {
+ /*
+ * Free deferred General Query responses.
+ */
+ IF_DRAIN(&igi->igi_gq);
+ IF_DRAIN(&igi->igi_v2q);
+ igmp_flush_relq(igi, inm_dthead);
+ VERIFY(SLIST_EMPTY(&igi->igi_relinmhead));
+ igi->igi_debug &= ~IFD_ATTACHED;
+ IGI_UNLOCK(igi);
+
+ LIST_REMOVE(igi, igi_link);
+ IGI_REMREF(igi); /* release igi_head reference */
+ return;
+ }
+ IGI_UNLOCK(igi);
+ }
+ panic("%s: igmp_ifinfo not found for ifp %p(%s)\n", __func__,
+ ifp, ifp->if_xname);
+}
+
+__private_extern__ void
+igmp_initsilent(struct ifnet *ifp, struct igmp_ifinfo *igi)
+{
+ ifnet_lock_assert(ifp, IFNET_LCK_ASSERT_OWNED);
+
+ IGI_LOCK_ASSERT_NOTHELD(igi);
+ IGI_LOCK(igi);
+ if (!(ifp->if_flags & IFF_MULTICAST))
+ igi->igi_flags |= IGIF_SILENT;
+ else
+ igi->igi_flags &= ~IGIF_SILENT;
+ IGI_UNLOCK(igi);
+}
+
+static void
+igi_initvar(struct igmp_ifinfo *igi, struct ifnet *ifp, int reattach)
+{
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ igi->igi_ifp = ifp;
+ igi->igi_version = igmp_default_version;
+ igi->igi_flags = 0;
+ igi->igi_rv = IGMP_RV_INIT;
+ igi->igi_qi = IGMP_QI_INIT;
+ igi->igi_qri = IGMP_QRI_INIT;
+ igi->igi_uri = IGMP_URI_INIT;
+
+ if (!reattach)
+ SLIST_INIT(&igi->igi_relinmhead);
/*
- * Quick check to see if any work needs to be done, in order
- * to minimize the overhead of fasttimo processing.
+ * Responses to general queries are subject to bounds.
*/
+ igi->igi_gq.ifq_maxlen = IGMP_MAX_RESPONSE_PACKETS;
+ igi->igi_v2q.ifq_maxlen = IGMP_MAX_RESPONSE_PACKETS;
+}
- if (!igmp_timers_are_running)
- return;
+static struct igmp_ifinfo *
+igi_alloc(int how)
+{
+ struct igmp_ifinfo *igi;
- igmp_timers_are_running = 0;
- IN_FIRST_MULTI(step, inm);
- while (inm != NULL) {
- if (inm->inm_timer == 0) {
- /* do nothing */
- } else if ((--inm->inm_timer == 0) && (inm->inm_rti != NULL)) {
- igmp_sendpkt(inm, inm->inm_rti->rti_type, 0);
- inm->inm_state = IGMP_IREPORTEDLAST;
- } else {
- igmp_timers_are_running = 1;
- }
- IN_NEXT_MULTI(step, inm);
+ igi = (how == M_WAITOK) ? zalloc(igi_zone) : zalloc_noblock(igi_zone);
+ if (igi != NULL) {
+ bzero(igi, igi_size);
+ lck_mtx_init(&igi->igi_lock, igmp_mtx_grp, igmp_mtx_attr);
+ igi->igi_debug |= IFD_ALLOC;
+ }
+ return (igi);
+}
+
+static void
+igi_free(struct igmp_ifinfo *igi)
+{
+ IGI_LOCK(igi);
+ if (igi->igi_debug & IFD_ATTACHED) {
+ panic("%s: attached igi=%p is being freed", __func__, igi);
+ /* NOTREACHED */
+ } else if (igi->igi_ifp != NULL) {
+ panic("%s: ifp not NULL for igi=%p", __func__, igi);
+ /* NOTREACHED */
+ } else if (!(igi->igi_debug & IFD_ALLOC)) {
+ panic("%s: igi %p cannot be freed", __func__, igi);
+ /* NOTREACHED */
+ } else if (igi->igi_refcnt != 0) {
+ panic("%s: non-zero refcnt igi=%p", __func__, igi);
+ /* NOTREACHED */
}
+ igi->igi_debug &= ~IFD_ALLOC;
+ IGI_UNLOCK(igi);
+
+ lck_mtx_destroy(&igi->igi_lock, igmp_mtx_grp);
+ zfree(igi_zone, igi);
}
void
-igmp_slowtimo(void)
+igi_addref(struct igmp_ifinfo *igi, int locked)
{
- struct router_info *rti = Head;
+ if (!locked)
+ IGI_LOCK_SPIN(igi);
+ else
+ IGI_LOCK_ASSERT_HELD(igi);
-#if IGMP_DEBUG
- printf("[igmp.c,_slowtimo] -- > entering \n");
-#endif
- while (rti) {
- if (rti->rti_type == IGMP_V1_ROUTER) {
- rti->rti_time++;
- if (rti->rti_time >= IGMP_AGE_THRESHOLD) {
- rti->rti_type = IGMP_V2_ROUTER;
- }
- }
- rti = rti->rti_next;
+ if (++igi->igi_refcnt == 0) {
+ panic("%s: igi=%p wraparound refcnt", __func__, igi);
+ /* NOTREACHED */
}
-#if IGMP_DEBUG
- printf("[igmp.c,_slowtimo] -- > exiting \n");
-#endif
+ if (!locked)
+ IGI_UNLOCK(igi);
}
-static void
-igmp_sendpkt(struct in_multi *inm, int type, uint32_t addr)
+void
+igi_remref(struct igmp_ifinfo *igi)
{
- struct mbuf *m;
- struct igmp *igmp;
- struct ip *ip;
- struct ip_moptions imo;
- struct route ro;
+ SLIST_HEAD(, in_multi) inm_dthead;
+ struct ifnet *ifp;
- MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
- if (m == NULL)
- return;
+ IGI_LOCK_SPIN(igi);
- m->m_pkthdr.rcvif = lo_ifp;
-#if CONFIG_MACF_NET
- mac_mbuf_label_associate_linklayer(inm->inm_ifp, m);
-#endif
- m->m_pkthdr.len = sizeof(struct ip) + IGMP_MINLEN;
- MH_ALIGN(m, IGMP_MINLEN + sizeof(struct ip));
- m->m_data += sizeof(struct ip);
- m->m_len = IGMP_MINLEN;
- m->m_pkthdr.csum_flags = 0;
- m->m_pkthdr.csum_data = 0;
- 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, IGMP_MINLEN);
-
- 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) + IGMP_MINLEN;
- ip->ip_off = 0;
- ip->ip_p = IPPROTO_IGMP;
- ip->ip_src.s_addr = INADDR_ANY;
- ip->ip_dst.s_addr = addr ? addr : igmp->igmp_group.s_addr;
-
- imo.imo_multicast_ifp = inm->inm_ifp;
- imo.imo_multicast_ttl = 1;
- imo.imo_multicast_vif = -1;
-#if MROUTING
- /*
- * Request loopback of the report if we are acting as a multicast
- * router, so that the process-level routing demon can hear it.
- */
- imo.imo_multicast_loop = (ip_mrouter != NULL);
-#else
- imo.imo_multicast_loop = 0;
-#endif
+ if (igi->igi_refcnt == 0) {
+ panic("%s: igi=%p negative refcnt", __func__, igi);
+ /* NOTREACHED */
+ }
+
+ --igi->igi_refcnt;
+ if (igi->igi_refcnt > 0) {
+ IGI_UNLOCK(igi);
+ return;
+ }
+
+ ifp = igi->igi_ifp;
+ igi->igi_ifp = NULL;
+ IF_DRAIN(&igi->igi_gq);
+ IF_DRAIN(&igi->igi_v2q);
+ SLIST_INIT(&inm_dthead);
+ igmp_flush_relq(igi, (struct igmp_inm_relhead *)&inm_dthead);
+ VERIFY(SLIST_EMPTY(&igi->igi_relinmhead));
+ IGI_UNLOCK(igi);
+
+ /* Now that we're dropped all locks, release detached records */
+ IGMP_REMOVE_DETACHED_INM(&inm_dthead);
+
+ IGMP_PRINTF(("%s: freeing igmp_ifinfo for ifp 0x%llx(%s)\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+
+ igi_free(igi);
+}
+
+/*
+ * Process a received IGMPv1 query.
+ * Return non-zero if the message should be dropped.
+ */
+static int
+igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip,
+ const struct igmp *igmp)
+{
+ struct igmp_ifinfo *igi;
+ struct in_multi *inm;
+ struct in_multistep step;
+ struct igmp_tparams itp = { 0, 0, 0, 0 };
+
+ IGMP_LOCK_ASSERT_NOTHELD();
/*
- * XXX
- * Do we have to worry about reentrancy here? Don't think so.
+ * IGMPv1 Host Membership Queries SHOULD always be addressed to
+ * 224.0.0.1. They are always treated as General Queries.
+ * igmp_group is always ignored. Do not drop it as a userland
+ * daemon may wish to see it.
*/
- bzero(&ro, sizeof (ro));
- (void) ip_output(m, router_alert, &ro, 0, &imo, NULL);
- if (ro.ro_rt != NULL) {
- rtfree(ro.ro_rt);
- ro.ro_rt = NULL;
+ if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) {
+ IGMPSTAT_INC(igps_rcv_badqueries);
+ OIGMPSTAT_INC(igps_rcv_badqueries);
+ goto done;
}
+ IGMPSTAT_INC(igps_rcv_gen_queries);
- ++igmpstat.igps_snd_reports;
-}
+ igi = IGMP_IFINFO(ifp);
+ VERIFY(igi != NULL);
+ IGI_LOCK(igi);
+ if (igi->igi_flags & IGIF_LOOPBACK) {
+ IGMP_PRINTF(("%s: ignore v1 query on IGIF_LOOPBACK "
+ "ifp 0x%llx(%s)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ IGI_UNLOCK(igi);
+ goto done;
+ }
+ /*
+ * Switch to IGMPv1 host compatibility mode.
+ */
+ itp.qpt = igmp_set_version(igi, IGMP_VERSION_1);
+ IGI_UNLOCK(igi);
+
+ IGMP_PRINTF(("%s: process v1 query on ifp 0x%llx(%s)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+
+ /*
+ * Start the timers in all of our group records
+ * for the interface on which the query arrived,
+ * except those which are already running.
+ */
+ in_multihead_lock_shared();
+ IN_FIRST_MULTI(step, inm);
+ while (inm != NULL) {
+ INM_LOCK(inm);
+ if (inm->inm_ifp != ifp || inm->inm_timer != 0)
+ goto next;
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ break;
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ case IGMP_REPORTING_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ inm->inm_state = IGMP_REPORTING_MEMBER;
+ inm->inm_timer = IGMP_RANDOM_DELAY(IGMP_V1V2_MAX_RI);
+ itp.cst = 1;
+ break;
+ case IGMP_LEAVING_MEMBER:
+ break;
+ }
+next:
+ INM_UNLOCK(inm);
+ IN_NEXT_MULTI(step, inm);
+ }
+ in_multihead_lock_done();
+done:
+ igmp_set_timeout(&itp);
+
+ return (0);
+}
+
+/*
+ * Process a received IGMPv2 general or group-specific query.
+ */
+static int
+igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip,
+ const struct igmp *igmp)
+{
+ struct igmp_ifinfo *igi;
+ struct in_multi *inm;
+ int is_general_query;
+ uint16_t timer;
+ struct igmp_tparams itp = { 0, 0, 0, 0 };
+
+ IGMP_LOCK_ASSERT_NOTHELD();
+
+ is_general_query = 0;
+
+ /*
+ * Validate address fields upfront.
+ */
+ if (in_nullhost(igmp->igmp_group)) {
+ /*
+ * IGMPv2 General Query.
+ * If this was not sent to the all-hosts group, ignore it.
+ */
+ if (!in_allhosts(ip->ip_dst))
+ goto done;
+ IGMPSTAT_INC(igps_rcv_gen_queries);
+ is_general_query = 1;
+ } else {
+ /* IGMPv2 Group-Specific Query. */
+ IGMPSTAT_INC(igps_rcv_group_queries);
+ }
+
+ igi = IGMP_IFINFO(ifp);
+ VERIFY(igi != NULL);
+
+ IGI_LOCK(igi);
+ if (igi->igi_flags & IGIF_LOOPBACK) {
+ IGMP_PRINTF(("%s: ignore v2 query on IGIF_LOOPBACK "
+ "ifp 0x%llx(%s)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ IGI_UNLOCK(igi);
+ goto done;
+ }
+ /*
+ * Ignore v2 query if in v1 Compatibility Mode.
+ */
+ if (igi->igi_version == IGMP_VERSION_1) {
+ IGI_UNLOCK(igi);
+ goto done;
+ }
+ itp.qpt = igmp_set_version(igi, IGMP_VERSION_2);
+ IGI_UNLOCK(igi);
+
+ timer = igmp->igmp_code / IGMP_TIMER_SCALE;
+ if (timer == 0)
+ timer = 1;
+
+ if (is_general_query) {
+ struct in_multistep step;
+
+ IGMP_PRINTF(("%s: process v2 general query on ifp 0x%llx(%s)\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ /*
+ * For each reporting group joined on this
+ * interface, kick the report timer.
+ */
+ in_multihead_lock_shared();
+ IN_FIRST_MULTI(step, inm);
+ while (inm != NULL) {
+ INM_LOCK(inm);
+ if (inm->inm_ifp == ifp)
+ itp.cst += igmp_v2_update_group(inm, timer);
+ INM_UNLOCK(inm);
+ IN_NEXT_MULTI(step, inm);
+ }
+ in_multihead_lock_done();
+ } else {
+ /*
+ * Group-specific IGMPv2 query, we need only
+ * look up the single group to process it.
+ */
+ in_multihead_lock_shared();
+ IN_LOOKUP_MULTI(&igmp->igmp_group, ifp, inm);
+ in_multihead_lock_done();
+ if (inm != NULL) {
+ INM_LOCK(inm);
+ IGMP_INET_PRINTF(igmp->igmp_group,
+ ("process v2 query %s on ifp 0x%llx(%s)\n",
+ _igmp_inet_buf,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ itp.cst = igmp_v2_update_group(inm, timer);
+ INM_UNLOCK(inm);
+ INM_REMREF(inm); /* from IN_LOOKUP_MULTI */
+ }
+ }
+done:
+ igmp_set_timeout(&itp);
+
+ return (0);
+}
+
+/*
+ * Update the report timer on a group in response to an IGMPv2 query.
+ *
+ * If we are becoming the reporting member for this group, start the timer.
+ * If we already are the reporting member for this group, and timer is
+ * below the threshold, reset it.
+ *
+ * We may be updating the group for the first time since we switched
+ * to IGMPv3. If we are, then we must clear any recorded source lists,
+ * and transition to REPORTING state; the group timer is overloaded
+ * for group and group-source query responses.
+ *
+ * Unlike IGMPv3, the delay per group should be jittered
+ * to avoid bursts of IGMPv2 reports.
+ */
+static uint32_t
+igmp_v2_update_group(struct in_multi *inm, const int timer)
+{
+
+ IGMP_INET_PRINTF(inm->inm_addr, ("%s: %s/%s timer=%d\n",
+ __func__, _igmp_inet_buf, if_name(inm->inm_ifp),
+ timer));
+
+ INM_LOCK_ASSERT_HELD(inm);
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ break;
+ case IGMP_REPORTING_MEMBER:
+ if (inm->inm_timer != 0 &&
+ inm->inm_timer <= timer) {
+ IGMP_PRINTF(("%s: REPORTING and timer running, "
+ "skipping.\n", __func__));
+ break;
+ }
+ /* FALLTHROUGH */
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ IGMP_PRINTF(("%s: ->REPORTING\n", __func__));
+ inm->inm_state = IGMP_REPORTING_MEMBER;
+ inm->inm_timer = IGMP_RANDOM_DELAY(timer);
+ break;
+ case IGMP_SLEEPING_MEMBER:
+ IGMP_PRINTF(("%s: ->AWAKENING\n", __func__));
+ inm->inm_state = IGMP_AWAKENING_MEMBER;
+ break;
+ case IGMP_LEAVING_MEMBER:
+ break;
+ }
+
+ return (inm->inm_timer);
+}
+
+/*
+ * Process a received IGMPv3 general, group-specific or
+ * group-and-source-specific query.
+ * Assumes m has already been pulled up to the full IGMP message length.
+ * Return 0 if successful, otherwise an appropriate error code is returned.
+ */
+static int
+igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
+ /*const*/ struct igmpv3 *igmpv3)
+{
+ struct igmp_ifinfo *igi;
+ struct in_multi *inm;
+ int is_general_query;
+ uint32_t maxresp, nsrc, qqi;
+ uint16_t timer;
+ uint8_t qrv;
+ struct igmp_tparams itp = { 0, 0, 0, 0 };
+
+ IGMP_LOCK_ASSERT_NOTHELD();
+
+ is_general_query = 0;
+
+ IGMP_PRINTF(("%s: process v3 query on ifp 0x%llx(%s)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+
+ maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */
+ if (maxresp >= 128) {
+ maxresp = IGMP_MANT(igmpv3->igmp_code) <<
+ (IGMP_EXP(igmpv3->igmp_code) + 3);
+ }
+
+ /*
+ * Robustness must never be less than 2 for on-wire IGMPv3.
+ * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make
+ * an exception for interfaces whose IGMPv3 state changes
+ * are redirected to loopback (e.g. MANET).
+ */
+ qrv = IGMP_QRV(igmpv3->igmp_misc);
+ if (qrv < 2) {
+ IGMP_PRINTF(("%s: clamping qrv %d to %d\n", __func__,
+ qrv, IGMP_RV_INIT));
+ qrv = IGMP_RV_INIT;
+ }
+
+ qqi = igmpv3->igmp_qqi;
+ if (qqi >= 128) {
+ qqi = IGMP_MANT(igmpv3->igmp_qqi) <<
+ (IGMP_EXP(igmpv3->igmp_qqi) + 3);
+ }
+
+ timer = maxresp / IGMP_TIMER_SCALE;
+ if (timer == 0)
+ timer = 1;
+
+ nsrc = ntohs(igmpv3->igmp_numsrc);
+
+ /*
+ * Validate address fields and versions upfront before
+ * accepting v3 query.
+ */
+ if (in_nullhost(igmpv3->igmp_group)) {
+ /*
+ * IGMPv3 General Query.
+ *
+ * General Queries SHOULD be directed to 224.0.0.1.
+ * A general query with a source list has undefined
+ * behaviour; discard it.
+ */
+ IGMPSTAT_INC(igps_rcv_gen_queries);
+ if (!in_allhosts(ip->ip_dst) || nsrc > 0) {
+ IGMPSTAT_INC(igps_rcv_badqueries);
+ OIGMPSTAT_INC(igps_rcv_badqueries);
+ goto done;
+ }
+ is_general_query = 1;
+ } else {
+ /* Group or group-source specific query. */
+ if (nsrc == 0)
+ IGMPSTAT_INC(igps_rcv_group_queries);
+ else
+ IGMPSTAT_INC(igps_rcv_gsr_queries);
+ }
+
+ igi = IGMP_IFINFO(ifp);
+ VERIFY(igi != NULL);
+
+ IGI_LOCK(igi);
+ if (igi->igi_flags & IGIF_LOOPBACK) {
+ IGMP_PRINTF(("%s: ignore v3 query on IGIF_LOOPBACK "
+ "ifp 0x%llx(%s)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ IGI_UNLOCK(igi);
+ goto done;
+ }
+
+ /*
+ * Discard the v3 query if we're in Compatibility Mode.
+ * The RFC is not obviously worded that hosts need to stay in
+ * compatibility mode until the Old Version Querier Present
+ * timer expires.
+ */
+ if (igi->igi_version != IGMP_VERSION_3) {
+ IGMP_PRINTF(("%s: ignore v3 query in v%d mode on "
+ "ifp 0x%llx(%s)\n", __func__, igi->igi_version,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ IGI_UNLOCK(igi);
+ goto done;
+ }
+
+ itp.qpt = igmp_set_version(igi, IGMP_VERSION_3);
+ igi->igi_rv = qrv;
+ igi->igi_qi = qqi;
+ igi->igi_qri = MAX(timer, IGMP_QRI_MIN);
+
+ IGMP_PRINTF(("%s: qrv %d qi %d qri %d\n", __func__, igi->igi_rv,
+ igi->igi_qi, igi->igi_qri));
+
+ if (is_general_query) {
+ /*
+ * Schedule a current-state report on this ifp for
+ * all groups, possibly containing source lists.
+ * If there is a pending General Query response
+ * scheduled earlier than the selected delay, do
+ * not schedule any other reports.
+ * Otherwise, reset the interface timer.
+ */
+ IGMP_PRINTF(("%s: process v3 general query on ifp 0x%llx(%s)\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) {
+ itp.it = igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer);
+ }
+ IGI_UNLOCK(igi);
+ } else {
+ IGI_UNLOCK(igi);
+ /*
+ * Group-source-specific queries are throttled on
+ * a per-group basis to defeat denial-of-service attempts.
+ * Queries for groups we are not a member of on this
+ * link are simply ignored.
+ */
+ in_multihead_lock_shared();
+ IN_LOOKUP_MULTI(&igmpv3->igmp_group, ifp, inm);
+ in_multihead_lock_done();
+ if (inm == NULL)
+ goto done;
+
+ INM_LOCK(inm);
+ if (nsrc > 0) {
+ if (!ratecheck(&inm->inm_lastgsrtv,
+ &igmp_gsrdelay)) {
+ IGMP_PRINTF(("%s: GS query throttled.\n",
+ __func__));
+ IGMPSTAT_INC(igps_drop_gsr_queries);
+ INM_UNLOCK(inm);
+ INM_REMREF(inm); /* from IN_LOOKUP_MULTI */
+ goto done;
+ }
+ }
+ IGMP_INET_PRINTF(igmpv3->igmp_group,
+ ("process v3 %s query on ifp 0x%llx(%s)\n", _igmp_inet_buf,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ /*
+ * If there is a pending General Query response
+ * scheduled sooner than the selected delay, no
+ * further report need be scheduled.
+ * Otherwise, prepare to respond to the
+ * group-specific or group-and-source query.
+ */
+ IGI_LOCK(igi);
+ itp.it = igi->igi_v3_timer;
+ IGI_UNLOCK(igi);
+ if (itp.it == 0 || itp.it >= timer) {
+ (void) igmp_input_v3_group_query(inm, timer, igmpv3);
+ itp.cst = inm->inm_timer;
+ }
+ INM_UNLOCK(inm);
+ INM_REMREF(inm); /* from IN_LOOKUP_MULTI */
+ }
+done:
+ if (itp.it > 0) {
+ IGMP_PRINTF(("%s: v3 general query response scheduled in "
+ "T+%d seconds on ifp 0x%llx(%s)\n", __func__, itp.it,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ }
+ igmp_set_timeout(&itp);
+
+ return (0);
+}
+
+/*
+ * Process a recieved IGMPv3 group-specific or group-and-source-specific
+ * query.
+ * Return <0 if any error occured. Currently this is ignored.
+ */
+static int
+igmp_input_v3_group_query(struct in_multi *inm,
+ int timer, /*const*/ struct igmpv3 *igmpv3)
+{
+ int retval;
+ uint16_t nsrc;
+
+ INM_LOCK_ASSERT_HELD(inm);
+
+ retval = 0;
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_LEAVING_MEMBER:
+ return (retval);
+ case IGMP_REPORTING_MEMBER:
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ break;
+ }
+
+ nsrc = ntohs(igmpv3->igmp_numsrc);
+
+ /*
+ * Deal with group-specific queries upfront.
+ * If any group query is already pending, purge any recorded
+ * source-list state if it exists, and schedule a query response
+ * for this group-specific query.
+ */
+ if (nsrc == 0) {
+ if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
+ inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) {
+ inm_clear_recorded(inm);
+ timer = min(inm->inm_timer, timer);
+ }
+ inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER;
+ inm->inm_timer = IGMP_RANDOM_DELAY(timer);
+ return (retval);
+ }
+
+ /*
+ * Deal with the case where a group-and-source-specific query has
+ * been received but a group-specific query is already pending.
+ */
+ if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) {
+ timer = min(inm->inm_timer, timer);
+ inm->inm_timer = IGMP_RANDOM_DELAY(timer);
+ return (retval);
+ }
+
+ /*
+ * Finally, deal with the case where a group-and-source-specific
+ * query has been received, where a response to a previous g-s-r
+ * query exists, or none exists.
+ * In this case, we need to parse the source-list which the Querier
+ * has provided us with and check if we have any source list filter
+ * entries at T1 for these sources. If we do not, there is no need
+ * schedule a report and the query may be dropped.
+ * If we do, we must record them and schedule a current-state
+ * report for those sources.
+ * FIXME: Handling source lists larger than 1 mbuf requires that
+ * we pass the mbuf chain pointer down to this function, and use
+ * m_getptr() to walk the chain.
+ */
+ if (inm->inm_nsrc > 0) {
+ const struct in_addr *ap;
+ int i, nrecorded;
+
+ ap = (const struct in_addr *)(igmpv3 + 1);
+ nrecorded = 0;
+ for (i = 0; i < nsrc; i++, ap++) {
+ retval = inm_record_source(inm, ap->s_addr);
+ if (retval < 0)
+ break;
+ nrecorded += retval;
+ }
+ if (nrecorded > 0) {
+ IGMP_PRINTF(("%s: schedule response to SG query\n",
+ __func__));
+ inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER;
+ inm->inm_timer = IGMP_RANDOM_DELAY(timer);
+ }
+ }
+
+ return (retval);
+}
+
+/*
+ * Process a received IGMPv1 host membership report.
+ *
+ * NOTE: 0.0.0.0 workaround breaks const correctness.
+ */
+static int
+igmp_input_v1_report(struct ifnet *ifp, struct mbuf *m, /*const*/ struct ip *ip,
+ /*const*/ struct igmp *igmp)
+{
+ struct in_ifaddr *ia;
+ struct in_multi *inm;
+
+ IGMPSTAT_INC(igps_rcv_reports);
+ OIGMPSTAT_INC(igps_rcv_reports);
+
+ if ((ifp->if_flags & IFF_LOOPBACK) ||
+ (m->m_pkthdr.pkt_flags & PKTF_LOOP))
+ return (0);
+
+ if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr) ||
+ !in_hosteq(igmp->igmp_group, ip->ip_dst))) {
+ IGMPSTAT_INC(igps_rcv_badreports);
+ OIGMPSTAT_INC(igps_rcv_badreports);
+ return (EINVAL);
+ }
+
+ /*
+ * RFC 3376, Section 4.2.13, 9.2, 9.3:
+ * Booting clients may use the source address 0.0.0.0. Some
+ * IGMP daemons may not know how to use IP_RECVIF to determine
+ * the interface upon which this message was received.
+ * Replace 0.0.0.0 with the subnet address if told to do so.
+ */
+ if (igmp_recvifkludge && in_nullhost(ip->ip_src)) {
+ IFP_TO_IA(ifp, ia);
+ if (ia != NULL) {
+ IFA_LOCK(&ia->ia_ifa);
+ ip->ip_src.s_addr = htonl(ia->ia_subnet);
+ IFA_UNLOCK(&ia->ia_ifa);
+ IFA_REMREF(&ia->ia_ifa);
+ }
+ }
+
+ IGMP_INET_PRINTF(igmp->igmp_group,
+ ("process v1 report %s on ifp 0x%llx(%s)\n", _igmp_inet_buf,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+
+ /*
+ * IGMPv1 report suppression.
+ * If we are a member of this group, and our membership should be
+ * reported, stop our group timer and transition to the 'lazy' state.
+ */
+ in_multihead_lock_shared();
+ IN_LOOKUP_MULTI(&igmp->igmp_group, ifp, inm);
+ in_multihead_lock_done();
+ if (inm != NULL) {
+ struct igmp_ifinfo *igi;
+
+ INM_LOCK(inm);
+
+ igi = inm->inm_igi;
+ VERIFY(igi != NULL);
+
+ IGMPSTAT_INC(igps_rcv_ourreports);
+ OIGMPSTAT_INC(igps_rcv_ourreports);
+
+ /*
+ * If we are in IGMPv3 host mode, do not allow the
+ * other host's IGMPv1 report to suppress our reports
+ * unless explicitly configured to do so.
+ */
+ IGI_LOCK(igi);
+ if (igi->igi_version == IGMP_VERSION_3) {
+ if (igmp_legacysupp)
+ igmp_v3_suppress_group_record(inm);
+ IGI_UNLOCK(igi);
+ INM_UNLOCK(inm);
+ INM_REMREF(inm); /* from IN_LOOKUP_MULTI */
+ return (0);
+ }
+
+ INM_LOCK_ASSERT_HELD(inm);
+ inm->inm_timer = 0;
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ break;
+ case IGMP_IDLE_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ IGMP_INET_PRINTF(igmp->igmp_group,
+ ("report suppressed for %s on ifp 0x%llx(%s)\n",
+ _igmp_inet_buf,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ case IGMP_SLEEPING_MEMBER:
+ inm->inm_state = IGMP_SLEEPING_MEMBER;
+ break;
+ case IGMP_REPORTING_MEMBER:
+ IGMP_INET_PRINTF(igmp->igmp_group,
+ ("report suppressed for %s on ifp 0x%llx(%s)\n",
+ _igmp_inet_buf,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+ if (igi->igi_version == IGMP_VERSION_1)
+ inm->inm_state = IGMP_LAZY_MEMBER;
+ else if (igi->igi_version == IGMP_VERSION_2)
+ inm->inm_state = IGMP_SLEEPING_MEMBER;
+ break;
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ case IGMP_LEAVING_MEMBER:
+ break;
+ }
+ IGI_UNLOCK(igi);
+ INM_UNLOCK(inm);
+ INM_REMREF(inm); /* from IN_LOOKUP_MULTI */
+ }
+
+ return (0);
+}
+
+/*
+ * Process a received IGMPv2 host membership report.
+ *
+ * NOTE: 0.0.0.0 workaround breaks const correctness.
+ */
+static int
+igmp_input_v2_report(struct ifnet *ifp, struct mbuf *m, /*const*/ struct ip *ip,
+ /*const*/ struct igmp *igmp)
+{
+ struct in_ifaddr *ia;
+ struct in_multi *inm;
+
+ /*
+ * Make sure we don't hear our own membership report. Fast
+ * leave requires knowing that we are the only member of a
+ * group.
+ */
+ IFP_TO_IA(ifp, ia);
+ if (ia != NULL) {
+ IFA_LOCK(&ia->ia_ifa);
+ if (in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) {
+ IFA_UNLOCK(&ia->ia_ifa);
+ IFA_REMREF(&ia->ia_ifa);
+ return (0);
+ }
+ IFA_UNLOCK(&ia->ia_ifa);
+ }
+
+ IGMPSTAT_INC(igps_rcv_reports);
+ OIGMPSTAT_INC(igps_rcv_reports);
+
+ if ((ifp->if_flags & IFF_LOOPBACK) ||
+ (m->m_pkthdr.pkt_flags & PKTF_LOOP)) {
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+ return (0);
+ }
+
+ if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
+ !in_hosteq(igmp->igmp_group, ip->ip_dst)) {
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+ IGMPSTAT_INC(igps_rcv_badreports);
+ OIGMPSTAT_INC(igps_rcv_badreports);
+ return (EINVAL);
+ }
+
+ /*
+ * RFC 3376, Section 4.2.13, 9.2, 9.3:
+ * Booting clients may use the source address 0.0.0.0. Some
+ * IGMP daemons may not know how to use IP_RECVIF to determine
+ * the interface upon which this message was received.
+ * Replace 0.0.0.0 with the subnet address if told to do so.
+ */
+ if (igmp_recvifkludge && in_nullhost(ip->ip_src)) {
+ if (ia != NULL) {
+ IFA_LOCK(&ia->ia_ifa);
+ ip->ip_src.s_addr = htonl(ia->ia_subnet);
+ IFA_UNLOCK(&ia->ia_ifa);
+ }
+ }
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+
+ IGMP_INET_PRINTF(igmp->igmp_group,
+ ("process v2 report %s on ifp 0x%llx(%s)\n", _igmp_inet_buf,
+ (uint64_t)VM_KERNEL_ADDRPERM(ifp), if_name(ifp)));
+
+ /*
+ * IGMPv2 report suppression.
+ * If we are a member of this group, and our membership should be
+ * reported, and our group timer is pending or about to be reset,
+ * stop our group timer by transitioning to the 'lazy' state.
+ */
+ in_multihead_lock_shared();
+ IN_LOOKUP_MULTI(&igmp->igmp_group, ifp, inm);
+ in_multihead_lock_done();
+ if (inm != NULL) {
+ struct igmp_ifinfo *igi;
+
+ INM_LOCK(inm);
+ igi = inm->inm_igi;
+ VERIFY(igi != NULL);
+
+ IGMPSTAT_INC(igps_rcv_ourreports);
+ OIGMPSTAT_INC(igps_rcv_ourreports);
+
+ /*
+ * If we are in IGMPv3 host mode, do not allow the
+ * other host's IGMPv1 report to suppress our reports
+ * unless explicitly configured to do so.
+ */
+ IGI_LOCK(igi);
+ if (igi->igi_version == IGMP_VERSION_3) {
+ if (igmp_legacysupp)
+ igmp_v3_suppress_group_record(inm);
+ IGI_UNLOCK(igi);
+ INM_UNLOCK(inm);
+ INM_REMREF(inm);
+ return (0);
+ }
+
+ inm->inm_timer = 0;
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ break;
+ case IGMP_REPORTING_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ IGMP_INET_PRINTF(igmp->igmp_group,
+ ("report suppressed for %s on ifp 0x%llx(%s)\n",
+ _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(ifp),
+ if_name(ifp)));
+ case IGMP_LAZY_MEMBER:
+ inm->inm_state = IGMP_LAZY_MEMBER;
+ break;
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ case IGMP_LEAVING_MEMBER:
+ break;
+ }
+ IGI_UNLOCK(igi);
+ INM_UNLOCK(inm);
+ INM_REMREF(inm);
+ }
+
+ return (0);
+}
+
+void
+igmp_input(struct mbuf *m, int off)
+{
+ int iphlen;
+ struct ifnet *ifp;
+ struct igmp *igmp;
+ struct ip *ip;
+ int igmplen;
+ int minlen;
+ int queryver;
+
+ IGMP_PRINTF(("%s: called w/mbuf (0x%llx,%d)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m), off));
+
+ ifp = m->m_pkthdr.rcvif;
+
+ IGMPSTAT_INC(igps_rcv_total);
+ OIGMPSTAT_INC(igps_rcv_total);
+
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
+ ip = mtod(m, struct ip *);
+ iphlen = off;
+
+ /* By now, ip_len no longer contains the length of IP header */
+ igmplen = ip->ip_len;
+
+ /*
+ * Validate lengths.
+ */
+ if (igmplen < IGMP_MINLEN) {
+ IGMPSTAT_INC(igps_rcv_tooshort);
+ OIGMPSTAT_INC(igps_rcv_tooshort);
+ m_freem(m);
+ return;
+ }
+
+ /*
+ * Always pullup to the minimum size for v1/v2 or v3
+ * to amortize calls to m_pulldown().
+ */
+ if (igmplen >= IGMP_V3_QUERY_MINLEN)
+ minlen = IGMP_V3_QUERY_MINLEN;
+ else
+ minlen = IGMP_MINLEN;
+
+ /* A bit more expensive than M_STRUCT_GET, but ensures alignment */
+ M_STRUCT_GET0(igmp, struct igmp *, m, off, minlen);
+ if (igmp == NULL) {
+ IGMPSTAT_INC(igps_rcv_tooshort);
+ OIGMPSTAT_INC(igps_rcv_tooshort);
+ return;
+ }
+ /* N.B.: we assume the packet was correctly aligned in ip_input. */
+
+ /*
+ * Validate checksum.
+ */
+ m->m_data += iphlen;
+ m->m_len -= iphlen;
+ if (in_cksum(m, igmplen)) {
+ IGMPSTAT_INC(igps_rcv_badsum);
+ OIGMPSTAT_INC(igps_rcv_badsum);
+ m_freem(m);
+ return;
+ }
+ m->m_data -= iphlen;
+ m->m_len += iphlen;
+
+ /*
+ * IGMP control traffic is link-scope, and must have a TTL of 1.
+ * DVMRP traffic (e.g. mrinfo, mtrace) is an exception;
+ * probe packets may come from beyond the LAN.
+ */
+ if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) {
+ IGMPSTAT_INC(igps_rcv_badttl);
+ m_freem(m);
+ return;
+ }
+
+ switch (igmp->igmp_type) {
+ case IGMP_HOST_MEMBERSHIP_QUERY:
+ if (igmplen == IGMP_MINLEN) {
+ if (igmp->igmp_code == 0)
+ queryver = IGMP_VERSION_1;
+ else
+ queryver = IGMP_VERSION_2;
+ } else if (igmplen >= IGMP_V3_QUERY_MINLEN) {
+ queryver = IGMP_VERSION_3;
+ } else {
+ IGMPSTAT_INC(igps_rcv_tooshort);
+ OIGMPSTAT_INC(igps_rcv_tooshort);
+ m_freem(m);
+ return;
+ }
+
+ OIGMPSTAT_INC(igps_rcv_queries);
+
+ switch (queryver) {
+ case IGMP_VERSION_1:
+ IGMPSTAT_INC(igps_rcv_v1v2_queries);
+ if (!igmp_v1enable)
+ break;
+ if (igmp_input_v1_query(ifp, ip, igmp) != 0) {
+ m_freem(m);
+ return;
+ }
+ break;
+
+ case IGMP_VERSION_2:
+ IGMPSTAT_INC(igps_rcv_v1v2_queries);
+ if (!igmp_v2enable)
+ break;
+ if (igmp_input_v2_query(ifp, ip, igmp) != 0) {
+ m_freem(m);
+ return;
+ }
+ break;
+
+ case IGMP_VERSION_3: {
+ struct igmpv3 *igmpv3;
+ uint16_t igmpv3len;
+ uint16_t srclen;
+ int nsrc;
+
+ IGMPSTAT_INC(igps_rcv_v3_queries);
+ igmpv3 = (struct igmpv3 *)igmp;
+ /*
+ * Validate length based on source count.
+ */
+ nsrc = ntohs(igmpv3->igmp_numsrc);
+ srclen = sizeof(struct in_addr) * nsrc;
+ if (igmplen < (IGMP_V3_QUERY_MINLEN + srclen)) {
+ IGMPSTAT_INC(igps_rcv_tooshort);
+ OIGMPSTAT_INC(igps_rcv_tooshort);
+ m_freem(m);
+ return;
+ }
+ igmpv3len = IGMP_V3_QUERY_MINLEN + srclen;
+ /*
+ * A bit more expensive than M_STRUCT_GET,
+ * but ensures alignment.
+ */
+ M_STRUCT_GET0(igmpv3, struct igmpv3 *, m,
+ off, igmpv3len);
+ if (igmpv3 == NULL) {
+ IGMPSTAT_INC(igps_rcv_tooshort);
+ OIGMPSTAT_INC(igps_rcv_tooshort);
+ return;
+ }
+ /*
+ * N.B.: we assume the packet was correctly
+ * aligned in ip_input.
+ */
+ if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) {
+ m_freem(m);
+ return;
+ }
+ }
+ break;
+ }
+ break;
+
+ case IGMP_v1_HOST_MEMBERSHIP_REPORT:
+ if (!igmp_v1enable)
+ break;
+ if (igmp_input_v1_report(ifp, m, ip, igmp) != 0) {
+ m_freem(m);
+ return;
+ }
+ break;
+
+ case IGMP_v2_HOST_MEMBERSHIP_REPORT:
+ if (!igmp_v2enable)
+ break;
+ if (!ip_checkrouteralert(m))
+ IGMPSTAT_INC(igps_rcv_nora);
+ if (igmp_input_v2_report(ifp, m, ip, igmp) != 0) {
+ m_freem(m);
+ return;
+ }
+ break;
+
+ case IGMP_v3_HOST_MEMBERSHIP_REPORT:
+ /*
+ * Hosts do not need to process IGMPv3 membership reports,
+ * as report suppression is no longer required.
+ */
+ if (!ip_checkrouteralert(m))
+ IGMPSTAT_INC(igps_rcv_nora);
+ break;
+
+ default:
+ break;
+ }
+
+ IGMP_LOCK_ASSERT_NOTHELD();
+ /*
+ * Pass all valid IGMP packets up to any process(es) listening on a
+ * raw IGMP socket.
+ */
+ rip_input(m, off);
+}
+
+/*
+ * Schedule IGMP timer based on various parameters; caller must ensure that
+ * lock ordering is maintained as this routine acquires IGMP global lock.
+ */
+void
+igmp_set_timeout(struct igmp_tparams *itp)
+{
+ IGMP_LOCK_ASSERT_NOTHELD();
+ VERIFY(itp != NULL);
+
+ if (itp->qpt != 0 || itp->it != 0 || itp->cst != 0 || itp->sct != 0) {
+ IGMP_LOCK();
+ if (itp->qpt != 0)
+ querier_present_timers_running = 1;
+ if (itp->it != 0)
+ interface_timers_running = 1;
+ if (itp->cst != 0)
+ current_state_timers_running = 1;
+ if (itp->sct != 0)
+ state_change_timers_running = 1;
+ igmp_sched_timeout();
+ IGMP_UNLOCK();
+ }
+}
+
+/*
+ * IGMP timer handler (per 1 second).
+ */
+static void
+igmp_timeout(void *arg)
+{
+#pragma unused(arg)
+ struct ifqueue scq; /* State-change packets */
+ struct ifqueue qrq; /* Query response packets */
+ struct ifnet *ifp;
+ struct igmp_ifinfo *igi;
+ struct in_multi *inm;
+ int loop = 0, uri_sec = 0;
+ SLIST_HEAD(, in_multi) inm_dthead;
+
+ SLIST_INIT(&inm_dthead);
+
+ /*
+ * Update coarse-grained networking timestamp (in sec.); the idea
+ * is to piggy-back on the timeout callout to update the counter
+ * returnable via net_uptime().
+ */
+ net_update_uptime();
+
+ IGMP_LOCK();
+
+ IGMP_PRINTF(("%s: qpt %d, it %d, cst %d, sct %d\n", __func__,
+ querier_present_timers_running, interface_timers_running,
+ current_state_timers_running, state_change_timers_running));
+
+ /*
+ * IGMPv1/v2 querier present timer processing.
+ */
+ if (querier_present_timers_running) {
+ querier_present_timers_running = 0;
+ LIST_FOREACH(igi, &igi_head, igi_link) {
+ IGI_LOCK(igi);
+ igmp_v1v2_process_querier_timers(igi);
+ if (igi->igi_v1_timer > 0 || igi->igi_v2_timer > 0)
+ querier_present_timers_running = 1;
+ IGI_UNLOCK(igi);
+ }
+ }
+
+ /*
+ * IGMPv3 General Query response timer processing.
+ */
+ if (interface_timers_running) {
+ IGMP_PRINTF(("%s: interface timers running\n", __func__));
+ interface_timers_running = 0;
+ LIST_FOREACH(igi, &igi_head, igi_link) {
+ IGI_LOCK(igi);
+ if (igi->igi_version != IGMP_VERSION_3) {
+ IGI_UNLOCK(igi);
+ continue;
+ }
+ if (igi->igi_v3_timer == 0) {
+ /* Do nothing. */
+ } else if (--igi->igi_v3_timer == 0) {
+ if (igmp_v3_dispatch_general_query(igi) > 0)
+ interface_timers_running = 1;
+ } else {
+ interface_timers_running = 1;
+ }
+ IGI_UNLOCK(igi);
+ }
+ }
+
+ if (!current_state_timers_running &&
+ !state_change_timers_running)
+ goto out_locked;
+
+ current_state_timers_running = 0;
+ state_change_timers_running = 0;
+
+ memset(&qrq, 0, sizeof(struct ifqueue));
+ qrq.ifq_maxlen = IGMP_MAX_G_GS_PACKETS;
+
+ memset(&scq, 0, sizeof(struct ifqueue));
+ scq.ifq_maxlen = IGMP_MAX_STATE_CHANGE_PACKETS;
+
+ IGMP_PRINTF(("%s: state change timers running\n", __func__));
+
+ /*
+ * IGMPv1/v2/v3 host report and state-change timer processing.
+ * Note: Processing a v3 group timer may remove a node.
+ */
+ LIST_FOREACH(igi, &igi_head, igi_link) {
+ struct in_multistep step;
+
+ IGI_LOCK(igi);
+ ifp = igi->igi_ifp;
+ loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
+ uri_sec = IGMP_RANDOM_DELAY(igi->igi_uri);
+ IGI_UNLOCK(igi);
+
+ in_multihead_lock_shared();
+ IN_FIRST_MULTI(step, inm);
+ while (inm != NULL) {
+ INM_LOCK(inm);
+ if (inm->inm_ifp != ifp)
+ goto next;
+
+ IGI_LOCK(igi);
+ switch (igi->igi_version) {
+ case IGMP_VERSION_1:
+ case IGMP_VERSION_2:
+ igmp_v1v2_process_group_timer(inm,
+ igi->igi_version);
+ break;
+ case IGMP_VERSION_3:
+ igmp_v3_process_group_timers(igi, &qrq,
+ &scq, inm, uri_sec);
+ break;
+ }
+ IGI_UNLOCK(igi);
+next:
+ INM_UNLOCK(inm);
+ IN_NEXT_MULTI(step, inm);
+ }
+ in_multihead_lock_done();
+
+ IGI_LOCK(igi);
+ if (igi->igi_version == IGMP_VERSION_1 ||
+ igi->igi_version == IGMP_VERSION_2) {
+ igmp_dispatch_queue(igi, &igi->igi_v2q, 0, loop);
+ } else if (igi->igi_version == IGMP_VERSION_3) {
+ IGI_UNLOCK(igi);
+ igmp_dispatch_queue(NULL, &qrq, 0, loop);
+ igmp_dispatch_queue(NULL, &scq, 0, loop);
+ VERIFY(qrq.ifq_len == 0);
+ VERIFY(scq.ifq_len == 0);
+ IGI_LOCK(igi);
+ }
+ /*
+ * In case there are still any pending membership reports
+ * which didn't get drained at version change time.
+ */
+ IF_DRAIN(&igi->igi_v2q);
+ /*
+ * Release all deferred inm records, and drain any locally
+ * enqueued packets; do it even if the current IGMP version
+ * for the link is no longer IGMPv3, in order to handle the
+ * version change case.
+ */
+ igmp_flush_relq(igi, (struct igmp_inm_relhead *)&inm_dthead);
+ VERIFY(SLIST_EMPTY(&igi->igi_relinmhead));
+ IGI_UNLOCK(igi);
+
+ IF_DRAIN(&qrq);
+ IF_DRAIN(&scq);
+ }
+
+out_locked:
+ /* re-arm the timer if there's work to do */
+ igmp_timeout_run = 0;
+ igmp_sched_timeout();
+ IGMP_UNLOCK();
+
+ /* Now that we're dropped all locks, release detached records */
+ IGMP_REMOVE_DETACHED_INM(&inm_dthead);
+}
+
+static void
+igmp_sched_timeout(void)
+{
+ IGMP_LOCK_ASSERT_HELD();
+
+ if (!igmp_timeout_run &&
+ (querier_present_timers_running || current_state_timers_running ||
+ interface_timers_running || state_change_timers_running)) {
+ igmp_timeout_run = 1;
+ timeout(igmp_timeout, NULL, hz);
+ }
+}
+
+/*
+ * Free the in_multi reference(s) for this IGMP lifecycle.
+ *
+ * Caller must be holding igi_lock.
+ */
+static void
+igmp_flush_relq(struct igmp_ifinfo *igi, struct igmp_inm_relhead *inm_dthead)
+{
+ struct in_multi *inm;
+
+again:
+ IGI_LOCK_ASSERT_HELD(igi);
+ inm = SLIST_FIRST(&igi->igi_relinmhead);
+ if (inm != NULL) {
+ int lastref;
+
+ SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele);
+ IGI_UNLOCK(igi);
+
+ in_multihead_lock_exclusive();
+ INM_LOCK(inm);
+ VERIFY(inm->inm_nrelecnt != 0);
+ inm->inm_nrelecnt--;
+ lastref = in_multi_detach(inm);
+ VERIFY(!lastref || (!(inm->inm_debug & IFD_ATTACHED) &&
+ inm->inm_reqcnt == 0));
+ INM_UNLOCK(inm);
+ in_multihead_lock_done();
+ /* from igi_relinmhead */
+ INM_REMREF(inm);
+ /* from in_multihead list */
+ if (lastref) {
+ /*
+ * Defer releasing our final reference, as we
+ * are holding the IGMP lock at this point, and
+ * we could end up with locking issues later on
+ * (while issuing SIOCDELMULTI) when this is the
+ * final reference count. Let the caller do it
+ * when it is safe.
+ */
+ IGMP_ADD_DETACHED_INM(inm_dthead, inm);
+ }
+ IGI_LOCK(igi);
+ goto again;
+ }
+}
+
+/*
+ * Update host report group timer for IGMPv1/v2.
+ * Will update the global pending timer flags.
+ */
+static void
+igmp_v1v2_process_group_timer(struct in_multi *inm, const int igmp_version)
+{
+ int report_timer_expired;
+
+ IGMP_LOCK_ASSERT_HELD();
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(inm->inm_igi);
+
+ if (inm->inm_timer == 0) {
+ report_timer_expired = 0;
+ } else if (--inm->inm_timer == 0) {
+ report_timer_expired = 1;
+ } else {
+ current_state_timers_running = 1;
+ /* caller will schedule timer */
+ return;
+ }
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ break;
+ case IGMP_REPORTING_MEMBER:
+ if (report_timer_expired) {
+ inm->inm_state = IGMP_IDLE_MEMBER;
+ (void) igmp_v1v2_queue_report(inm,
+ (igmp_version == IGMP_VERSION_2) ?
+ IGMP_v2_HOST_MEMBERSHIP_REPORT :
+ IGMP_v1_HOST_MEMBERSHIP_REPORT);
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(inm->inm_igi);
+ }
+ break;
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ case IGMP_LEAVING_MEMBER:
+ break;
+ }
+}
+
+/*
+ * Update a group's timers for IGMPv3.
+ * Will update the global pending timer flags.
+ * Note: Unlocked read from igi.
+ */
+static void
+igmp_v3_process_group_timers(struct igmp_ifinfo *igi,
+ struct ifqueue *qrq, struct ifqueue *scq,
+ struct in_multi *inm, const int uri_sec)
+{
+ int query_response_timer_expired;
+ int state_change_retransmit_timer_expired;
+
+ IGMP_LOCK_ASSERT_HELD();
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(igi);
+ VERIFY(igi == inm->inm_igi);
+
+ query_response_timer_expired = 0;
+ state_change_retransmit_timer_expired = 0;
+
+ /*
+ * During a transition from v1/v2 compatibility mode back to v3,
+ * a group record in REPORTING state may still have its group
+ * timer active. This is a no-op in this function; it is easier
+ * to deal with it here than to complicate the timeout path.
+ */
+ if (inm->inm_timer == 0) {
+ query_response_timer_expired = 0;
+ } else if (--inm->inm_timer == 0) {
+ query_response_timer_expired = 1;
+ } else {
+ current_state_timers_running = 1;
+ /* caller will schedule timer */
+ }
+
+ if (inm->inm_sctimer == 0) {
+ state_change_retransmit_timer_expired = 0;
+ } else if (--inm->inm_sctimer == 0) {
+ state_change_retransmit_timer_expired = 1;
+ } else {
+ state_change_timers_running = 1;
+ /* caller will schedule timer */
+ }
+
+ /* We are in timer callback, so be quick about it. */
+ if (!state_change_retransmit_timer_expired &&
+ !query_response_timer_expired)
+ return;
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ break;
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ /*
+ * Respond to a previously pending Group-Specific
+ * or Group-and-Source-Specific query by enqueueing
+ * the appropriate Current-State report for
+ * immediate transmission.
+ */
+ if (query_response_timer_expired) {
+ int retval;
+
+ retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1,
+ (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER));
+ IGMP_PRINTF(("%s: enqueue record = %d\n",
+ __func__, retval));
+ inm->inm_state = IGMP_REPORTING_MEMBER;
+ /* XXX Clear recorded sources for next time. */
+ inm_clear_recorded(inm);
+ }
+ /* FALLTHROUGH */
+ case IGMP_REPORTING_MEMBER:
+ case IGMP_LEAVING_MEMBER:
+ if (state_change_retransmit_timer_expired) {
+ /*
+ * State-change retransmission timer fired.
+ * If there are any further pending retransmissions,
+ * set the global pending state-change flag, and
+ * reset the timer.
+ */
+ if (--inm->inm_scrv > 0) {
+ inm->inm_sctimer = uri_sec;
+ state_change_timers_running = 1;
+ /* caller will schedule timer */
+ }
+ /*
+ * Retransmit the previously computed state-change
+ * report. If there are no further pending
+ * retransmissions, the mbuf queue will be consumed.
+ * Update T0 state to T1 as we have now sent
+ * a state-change.
+ */
+ (void) igmp_v3_merge_state_changes(inm, scq);
+
+ inm_commit(inm);
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: T1 -> T0 for %s/%s\n", __func__,
+ _igmp_inet_buf, if_name(inm->inm_ifp)));
+
+ /*
+ * If we are leaving the group for good, make sure
+ * we release IGMP's reference to it.
+ * This release must be deferred using a SLIST,
+ * as we are called from a loop which traverses
+ * the in_multihead list.
+ */
+ if (inm->inm_state == IGMP_LEAVING_MEMBER &&
+ inm->inm_scrv == 0) {
+ inm->inm_state = IGMP_NOT_MEMBER;
+ /*
+ * A reference has already been held in
+ * igmp_final_leave() for this inm, so
+ * no need to hold another one. We also
+ * bumped up its request count then, so
+ * that it stays in in_multihead. Both
+ * of them will be released when it is
+ * dequeued later on.
+ */
+ VERIFY(inm->inm_nrelecnt != 0);
+ SLIST_INSERT_HEAD(&igi->igi_relinmhead,
+ inm, inm_nrele);
+ }
+ }
+ break;
+ }
+}
+
+/*
+ * Suppress a group's pending response to a group or source/group query.
+ *
+ * Do NOT suppress state changes. This leads to IGMPv3 inconsistency.
+ * Do NOT update ST1/ST0 as this operation merely suppresses
+ * the currently pending group record.
+ * Do NOT suppress the response to a general query. It is possible but
+ * it would require adding another state or flag.
+ */
+static void
+igmp_v3_suppress_group_record(struct in_multi *inm)
+{
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(inm->inm_igi);
+
+ VERIFY(inm->inm_igi->igi_version == IGMP_VERSION_3);
+
+ if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER ||
+ inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER)
+ return;
+
+ if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)
+ inm_clear_recorded(inm);
+
+ inm->inm_timer = 0;
+ inm->inm_state = IGMP_REPORTING_MEMBER;
+}
+
+/*
+ * Switch to a different IGMP version on the given interface,
+ * as per Section 7.2.1.
+ */
+static uint32_t
+igmp_set_version(struct igmp_ifinfo *igi, const int igmp_version)
+{
+ int old_version_timer;
+
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ IGMP_PRINTF(("%s: switching to v%d on ifp 0x%llx(%s)\n", __func__,
+ igmp_version, (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp),
+ if_name(igi->igi_ifp)));
+
+ if (igmp_version == IGMP_VERSION_1 || igmp_version == IGMP_VERSION_2) {
+ /*
+ * Compute the "Older Version Querier Present" timer as per
+ * Section 8.12, in seconds.
+ */
+ old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri;
+
+ if (igmp_version == IGMP_VERSION_1) {
+ igi->igi_v1_timer = old_version_timer;
+ igi->igi_v2_timer = 0;
+ } else if (igmp_version == IGMP_VERSION_2) {
+ igi->igi_v1_timer = 0;
+ igi->igi_v2_timer = old_version_timer;
+ }
+ }
+
+ if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
+ if (igi->igi_version != IGMP_VERSION_2) {
+ igi->igi_version = IGMP_VERSION_2;
+ igmp_v3_cancel_link_timers(igi);
+ }
+ } else if (igi->igi_v1_timer > 0) {
+ if (igi->igi_version != IGMP_VERSION_1) {
+ igi->igi_version = IGMP_VERSION_1;
+ igmp_v3_cancel_link_timers(igi);
+ }
+ }
+
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ return (MAX(igi->igi_v1_timer, igi->igi_v2_timer));
+}
+
+/*
+ * Cancel pending IGMPv3 timers for the given link and all groups
+ * joined on it; state-change, general-query, and group-query timers.
+ *
+ * Only ever called on a transition from v3 to Compatibility mode. Kill
+ * the timers stone dead (this may be expensive for large N groups), they
+ * will be restarted if Compatibility Mode deems that they must be due to
+ * query processing.
+ */
+static void
+igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi)
+{
+ struct ifnet *ifp;
+ struct in_multi *inm;
+ struct in_multistep step;
+
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ IGMP_PRINTF(("%s: cancel v3 timers on ifp 0x%llx(%s)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp), if_name(igi->igi_ifp)));
+
+ /*
+ * Stop the v3 General Query Response on this link stone dead.
+ * If timer is woken up due to interface_timers_running,
+ * the flag will be cleared if there are no pending link timers.
+ */
+ igi->igi_v3_timer = 0;
+
+ /*
+ * Now clear the current-state and state-change report timers
+ * for all memberships scoped to this link.
+ */
+ ifp = igi->igi_ifp;
+ IGI_UNLOCK(igi);
+
+ in_multihead_lock_shared();
+ IN_FIRST_MULTI(step, inm);
+ while (inm != NULL) {
+ INM_LOCK(inm);
+ if (inm->inm_ifp != ifp)
+ goto next;
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ /*
+ * These states are either not relevant in v3 mode,
+ * or are unreported. Do nothing.
+ */
+ break;
+ case IGMP_LEAVING_MEMBER:
+ /*
+ * If we are leaving the group and switching to
+ * compatibility mode, we need to release the final
+ * reference held for issuing the INCLUDE {}, and
+ * transition to REPORTING to ensure the host leave
+ * message is sent upstream to the old querier --
+ * transition to NOT would lose the leave and race.
+ * During igmp_final_leave(), we bumped up both the
+ * request and reference counts. Since we cannot
+ * call in_multi_detach() here, defer this task to
+ * the timer routine.
+ */
+ VERIFY(inm->inm_nrelecnt != 0);
+ IGI_LOCK(igi);
+ SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele);
+ IGI_UNLOCK(igi);
+ /* FALLTHROUGH */
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ inm_clear_recorded(inm);
+ /* FALLTHROUGH */
+ case IGMP_REPORTING_MEMBER:
+ inm->inm_state = IGMP_REPORTING_MEMBER;
+ break;
+ }
+ /*
+ * Always clear state-change and group report timers.
+ * Free any pending IGMPv3 state-change records.
+ */
+ inm->inm_sctimer = 0;
+ inm->inm_timer = 0;
+ IF_DRAIN(&inm->inm_scq);
+next:
+ INM_UNLOCK(inm);
+ IN_NEXT_MULTI(step, inm);
+ }
+ in_multihead_lock_done();
+
+ IGI_LOCK(igi);
+}
+
+/*
+ * Update the Older Version Querier Present timers for a link.
+ * See Section 7.2.1 of RFC 3376.
+ */
+static void
+igmp_v1v2_process_querier_timers(struct igmp_ifinfo *igi)
+{
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) {
+ /*
+ * IGMPv1 and IGMPv2 Querier Present timers expired.
+ *
+ * Revert to IGMPv3.
+ */
+ if (igi->igi_version != IGMP_VERSION_3) {
+ IGMP_PRINTF(("%s: transition from v%d -> v%d "
+ "on 0x%llx(%s)\n", __func__,
+ igi->igi_version, IGMP_VERSION_3,
+ (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp),
+ if_name(igi->igi_ifp)));
+ igi->igi_version = IGMP_VERSION_3;
+ IF_DRAIN(&igi->igi_v2q);
+ }
+ } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
+ /*
+ * IGMPv1 Querier Present timer expired,
+ * IGMPv2 Querier Present timer running.
+ * If IGMPv2 was disabled since last timeout,
+ * revert to IGMPv3.
+ * If IGMPv2 is enabled, revert to IGMPv2.
+ */
+ if (!igmp_v2enable) {
+ IGMP_PRINTF(("%s: transition from v%d -> v%d "
+ "on 0x%llx(%s%d)\n", __func__,
+ igi->igi_version, IGMP_VERSION_3,
+ (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp),
+ igi->igi_ifp->if_name, igi->igi_ifp->if_unit));
+ igi->igi_v2_timer = 0;
+ igi->igi_version = IGMP_VERSION_3;
+ IF_DRAIN(&igi->igi_v2q);
+ } else {
+ --igi->igi_v2_timer;
+ if (igi->igi_version != IGMP_VERSION_2) {
+ IGMP_PRINTF(("%s: transition from v%d -> v%d "
+ "on 0x%llx(%s)\n", __func__,
+ igi->igi_version, IGMP_VERSION_2,
+ (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp),
+ if_name(igi->igi_ifp)));
+ igi->igi_version = IGMP_VERSION_2;
+ IF_DRAIN(&igi->igi_gq);
+ igmp_v3_cancel_link_timers(igi);
+ }
+ }
+ } else if (igi->igi_v1_timer > 0) {
+ /*
+ * IGMPv1 Querier Present timer running.
+ * Stop IGMPv2 timer if running.
+ *
+ * If IGMPv1 was disabled since last timeout,
+ * revert to IGMPv3.
+ * If IGMPv1 is enabled, reset IGMPv2 timer if running.
+ */
+ if (!igmp_v1enable) {
+ IGMP_PRINTF(("%s: transition from v%d -> v%d "
+ "on 0x%llx(%s%d)\n", __func__,
+ igi->igi_version, IGMP_VERSION_3,
+ (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp),
+ igi->igi_ifp->if_name, igi->igi_ifp->if_unit));
+ igi->igi_v1_timer = 0;
+ igi->igi_version = IGMP_VERSION_3;
+ IF_DRAIN(&igi->igi_v2q);
+ } else {
+ --igi->igi_v1_timer;
+ }
+ if (igi->igi_v2_timer > 0) {
+ IGMP_PRINTF(("%s: cancel v2 timer on 0x%llx(%s%d)\n",
+ __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(igi->igi_ifp),
+ igi->igi_ifp->if_name, igi->igi_ifp->if_unit));
+ igi->igi_v2_timer = 0;
+ }
+ }
+}
+
+/*
+ * Dispatch an IGMPv1/v2 host report or leave message.
+ * These are always small enough to fit inside a single mbuf.
+ */
+static int
+igmp_v1v2_queue_report(struct in_multi *inm, const int type)
+{
+ struct ifnet *ifp;
+ struct igmp *igmp;
+ struct ip *ip;
+ struct mbuf *m;
+ int error = 0;
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(inm->inm_igi);
+
+ ifp = inm->inm_ifp;
+
+ MGETHDR(m, M_DONTWAIT, MT_DATA);
+ if (m == NULL)
+ return (ENOMEM);
+ MH_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp));
+
+ m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp);
+
+ m->m_data += sizeof(struct ip);
+ m->m_len = sizeof(struct igmp);
+
+ igmp = mtod(m, struct igmp *);
+ igmp->igmp_type = type;
+ igmp->igmp_code = 0;
+ igmp->igmp_group = inm->inm_addr;
+ igmp->igmp_cksum = 0;
+ igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp));
+
+ m->m_data -= sizeof(struct ip);
+ m->m_len += sizeof(struct ip);
+
+ ip = mtod(m, struct ip *);
+ ip->ip_tos = 0;
+ ip->ip_len = sizeof(struct ip) + sizeof(struct igmp);
+ ip->ip_off = 0;
+ ip->ip_p = IPPROTO_IGMP;
+ ip->ip_src.s_addr = INADDR_ANY;
+
+ if (type == IGMP_HOST_LEAVE_MESSAGE)
+ ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP);
+ else
+ ip->ip_dst = inm->inm_addr;
+
+ igmp_save_context(m, ifp);
+
+ m->m_flags |= M_IGMPV2;
+ if (inm->inm_igi->igi_flags & IGIF_LOOPBACK)
+ m->m_flags |= M_IGMP_LOOP;
+
+ /*
+ * Due to the fact that at this point we are possibly holding
+ * in_multihead_lock in shared or exclusive mode, we can't call
+ * igmp_sendpkt() here since that will eventually call ip_output(),
+ * which will try to lock in_multihead_lock and cause a deadlock.
+ * Instead we defer the work to the igmp_timeout() thread, thus
+ * avoiding unlocking in_multihead_lock here.
+ */
+ if (IF_QFULL(&inm->inm_igi->igi_v2q)) {
+ IGMP_PRINTF(("%s: v1/v2 outbound queue full\n", __func__));
+ error = ENOMEM;
+ m_freem(m);
+ } else {
+ IF_ENQUEUE(&inm->inm_igi->igi_v2q, m);
+ VERIFY(error == 0);
+ }
+ return (error);
+}
+
+/*
+ * Process a state change from the upper layer for the given IPv4 group.
+ *
+ * Each socket holds a reference on the in_multi in its own ip_moptions.
+ * The socket layer will have made the necessary updates to the group
+ * state, it is now up to IGMP to issue a state change report if there
+ * has been any change between T0 (when the last state-change was issued)
+ * and T1 (now).
+ *
+ * We use the IGMPv3 state machine at group level. The IGMP module
+ * however makes the decision as to which IGMP protocol version to speak.
+ * A state change *from* INCLUDE {} always means an initial join.
+ * A state change *to* INCLUDE {} always means a final leave.
+ *
+ * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can
+ * save ourselves a bunch of work; any exclusive mode groups need not
+ * compute source filter lists.
+ */
+int
+igmp_change_state(struct in_multi *inm, struct igmp_tparams *itp)
+{
+ struct igmp_ifinfo *igi;
+ struct ifnet *ifp;
+ int error = 0;
+
+ VERIFY(itp != NULL);
+ bzero(itp, sizeof (*itp));
+
+ INM_LOCK_ASSERT_HELD(inm);
+ VERIFY(inm->inm_igi != NULL);
+ IGI_LOCK_ASSERT_NOTHELD(inm->inm_igi);
+
+ /*
+ * Try to detect if the upper layer just asked us to change state
+ * for an interface which has now gone away.
+ */
+ VERIFY(inm->inm_ifma != NULL);
+ ifp = inm->inm_ifma->ifma_ifp;
+ /*
+ * Sanity check that netinet's notion of ifp is the same as net's.
+ */
+ VERIFY(inm->inm_ifp == ifp);
+
+ igi = IGMP_IFINFO(ifp);
+ VERIFY(igi != NULL);
+
+ /*
+ * If we detect a state transition to or from MCAST_UNDEFINED
+ * for this group, then we are starting or finishing an IGMP
+ * life cycle for this group.
+ */
+ if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) {
+ IGMP_PRINTF(("%s: inm transition %d -> %d\n", __func__,
+ inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode));
+ if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) {
+ IGMP_PRINTF(("%s: initial join\n", __func__));
+ error = igmp_initial_join(inm, igi, itp);
+ goto out;
+ } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) {
+ IGMP_PRINTF(("%s: final leave\n", __func__));
+ igmp_final_leave(inm, igi, itp);
+ goto out;
+ }
+ } else {
+ IGMP_PRINTF(("%s: filter set change\n", __func__));
+ }
+
+ error = igmp_handle_state_change(inm, igi, itp);
+out:
+ return (error);
+}
+
+/*
+ * Perform the initial join for an IGMP group.
+ *
+ * When joining a group:
+ * If the group should have its IGMP traffic suppressed, do nothing.
+ * IGMPv1 starts sending IGMPv1 host membership reports.
+ * IGMPv2 starts sending IGMPv2 host membership reports.
+ * IGMPv3 will schedule an IGMPv3 state-change report containing the
+ * initial state of the membership.
+ */
+static int
+igmp_initial_join(struct in_multi *inm, struct igmp_ifinfo *igi,
+ struct igmp_tparams *itp)
+{
+ struct ifnet *ifp;
+ struct ifqueue *ifq;
+ int error, retval, syncstates;
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_NOTHELD(igi);
+ VERIFY(itp != NULL);
+
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: initial join %s on ifp 0x%llx(%s)\n", __func__,
+ _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(inm->inm_ifp),
+ if_name(inm->inm_ifp)));
+
+ error = 0;
+ syncstates = 1;
+
+ ifp = inm->inm_ifp;
+
+ IGI_LOCK(igi);
+ VERIFY(igi->igi_ifp == ifp);
+
+ /*
+ * Groups joined on loopback or marked as 'not reported',
+ * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and
+ * are never reported in any IGMP protocol exchanges.
+ * All other groups enter the appropriate IGMP state machine
+ * for the version in use on this link.
+ * A link marked as IGIF_SILENT causes IGMP to be completely
+ * disabled for the link.
+ */
+ if ((ifp->if_flags & IFF_LOOPBACK) ||
+ (igi->igi_flags & IGIF_SILENT) ||
+ !igmp_isgroupreported(inm->inm_addr)) {
+ IGMP_PRINTF(("%s: not kicking state machine for silent group\n",
+ __func__));
+ inm->inm_state = IGMP_SILENT_MEMBER;
+ inm->inm_timer = 0;
+ } else {
+ /*
+ * Deal with overlapping in_multi lifecycle.
+ * If this group was LEAVING, then make sure
+ * we drop the reference we picked up to keep the
+ * group around for the final INCLUDE {} enqueue.
+ * Since we cannot call in_multi_detach() here,
+ * defer this task to the timer routine.
+ */
+ if (igi->igi_version == IGMP_VERSION_3 &&
+ inm->inm_state == IGMP_LEAVING_MEMBER) {
+ VERIFY(inm->inm_nrelecnt != 0);
+ SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele);
+ }
+
+ inm->inm_state = IGMP_REPORTING_MEMBER;
+
+ switch (igi->igi_version) {
+ case IGMP_VERSION_1:
+ case IGMP_VERSION_2:
+ inm->inm_state = IGMP_IDLE_MEMBER;
+ error = igmp_v1v2_queue_report(inm,
+ (igi->igi_version == IGMP_VERSION_2) ?
+ IGMP_v2_HOST_MEMBERSHIP_REPORT :
+ IGMP_v1_HOST_MEMBERSHIP_REPORT);
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ if (error == 0) {
+ inm->inm_timer =
+ IGMP_RANDOM_DELAY(IGMP_V1V2_MAX_RI);
+ itp->cst = 1;
+ }
+ break;
+
+ case IGMP_VERSION_3:
+ /*
+ * Defer update of T0 to T1, until the first copy
+ * of the state change has been transmitted.
+ */
+ syncstates = 0;
+
+ /*
+ * Immediately enqueue a State-Change Report for
+ * this interface, freeing any previous reports.
+ * Don't kick the timers if there is nothing to do,
+ * or if an error occurred.
+ */
+ ifq = &inm->inm_scq;
+ IF_DRAIN(ifq);
+ retval = igmp_v3_enqueue_group_record(ifq, inm, 1,
+ 0, 0);
+ itp->cst = (ifq->ifq_len > 0);
+ IGMP_PRINTF(("%s: enqueue record = %d\n",
+ __func__, retval));
+ if (retval <= 0) {
+ error = retval * -1;
+ break;
+ }
+
+ /*
+ * Schedule transmission of pending state-change
+ * report up to RV times for this link. The timer
+ * will fire at the next igmp_timeout (1 second),
+ * giving us an opportunity to merge the reports.
+ */
+ if (igi->igi_flags & IGIF_LOOPBACK) {
+ inm->inm_scrv = 1;
+ } else {
+ VERIFY(igi->igi_rv > 1);
+ inm->inm_scrv = igi->igi_rv;
+ }
+ inm->inm_sctimer = 1;
+ itp->sct = 1;
+
+ error = 0;
+ break;
+ }
+ }
+ IGI_UNLOCK(igi);
+
+ /*
+ * Only update the T0 state if state change is atomic,
+ * i.e. we don't need to wait for a timer to fire before we
+ * can consider the state change to have been communicated.
+ */
+ if (syncstates) {
+ inm_commit(inm);
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: T1 -> T0 for %s/%s\n", __func__,
+ _igmp_inet_buf, if_name(inm->inm_ifp)));
+ }
+
+ return (error);
+}
+
+/*
+ * Issue an intermediate state change during the IGMP life-cycle.
+ */
+static int
+igmp_handle_state_change(struct in_multi *inm, struct igmp_ifinfo *igi,
+ struct igmp_tparams *itp)
+{
+ struct ifnet *ifp;
+ int retval = 0;
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_NOTHELD(igi);
+ VERIFY(itp != NULL);
+
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: state change for %s on ifp 0x%llx(%s)\n", __func__,
+ _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(inm->inm_ifp),
+ if_name(inm->inm_ifp)));
+
+ ifp = inm->inm_ifp;
+
+ IGI_LOCK(igi);
+ VERIFY(igi->igi_ifp == ifp);
+
+ if ((ifp->if_flags & IFF_LOOPBACK) ||
+ (igi->igi_flags & IGIF_SILENT) ||
+ !igmp_isgroupreported(inm->inm_addr) ||
+ (igi->igi_version != IGMP_VERSION_3)) {
+ IGI_UNLOCK(igi);
+ if (!igmp_isgroupreported(inm->inm_addr)) {
+ IGMP_PRINTF(("%s: not kicking state "
+ "machine for silent group\n", __func__));
+ }
+ IGMP_PRINTF(("%s: nothing to do\n", __func__));
+ inm_commit(inm);
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: T1 -> T0 for %s/%s\n", __func__,
+ _igmp_inet_buf, inm->inm_ifp->if_name));
+ goto done;
+ }
+
+ IF_DRAIN(&inm->inm_scq);
+
+ retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0);
+ itp->cst = (inm->inm_scq.ifq_len > 0);
+ IGMP_PRINTF(("%s: enqueue record = %d\n", __func__, retval));
+ if (retval <= 0) {
+ IGI_UNLOCK(igi);
+ retval *= -1;
+ goto done;
+ }
+ /*
+ * If record(s) were enqueued, start the state-change
+ * report timer for this group.
+ */
+ inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv);
+ inm->inm_sctimer = 1;
+ itp->sct = 1;
+ IGI_UNLOCK(igi);
+done:
+ return (retval);
+}
+
+/*
+ * Perform the final leave for an IGMP group.
+ *
+ * When leaving a group:
+ * IGMPv1 does nothing.
+ * IGMPv2 sends a host leave message, if and only if we are the reporter.
+ * IGMPv3 enqueues a state-change report containing a transition
+ * to INCLUDE {} for immediate transmission.
+ */
+static void
+igmp_final_leave(struct in_multi *inm, struct igmp_ifinfo *igi,
+ struct igmp_tparams *itp)
+{
+ int syncstates = 1;
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_NOTHELD(igi);
+ VERIFY(itp != NULL);
+
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: final leave %s on ifp 0x%llx(%s)\n", __func__,
+ _igmp_inet_buf, (uint64_t)VM_KERNEL_ADDRPERM(inm->inm_ifp),
+ if_name(inm->inm_ifp)));
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ case IGMP_LEAVING_MEMBER:
+ /* Already leaving or left; do nothing. */
+ IGMP_PRINTF(("%s: not kicking state machine for silent group\n",
+ __func__));
+ break;
+ case IGMP_REPORTING_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ IGI_LOCK(igi);
+ if (igi->igi_version == IGMP_VERSION_2) {
+ if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
+ inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) {
+ panic("%s: IGMPv3 state reached, not IGMPv3 "
+ "mode\n", __func__);
+ /* NOTREACHED */
+ }
+ /* scheduler timer if enqueue is successful */
+ itp->cst = (igmp_v1v2_queue_report(inm,
+ IGMP_HOST_LEAVE_MESSAGE) == 0);
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ inm->inm_state = IGMP_NOT_MEMBER;
+ } else if (igi->igi_version == IGMP_VERSION_3) {
+ /*
+ * Stop group timer and all pending reports.
+ * Immediately enqueue a state-change report
+ * TO_IN {} to be sent on the next timeout,
+ * giving us an opportunity to merge reports.
+ */
+ IF_DRAIN(&inm->inm_scq);
+ inm->inm_timer = 0;
+ if (igi->igi_flags & IGIF_LOOPBACK) {
+ inm->inm_scrv = 1;
+ } else {
+ inm->inm_scrv = igi->igi_rv;
+ }
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: Leaving %s/%s with %d "
+ "pending retransmissions.\n", __func__,
+ _igmp_inet_buf, if_name(inm->inm_ifp),
+ inm->inm_scrv));
+ if (inm->inm_scrv == 0) {
+ inm->inm_state = IGMP_NOT_MEMBER;
+ inm->inm_sctimer = 0;
+ } else {
+ int retval;
+ /*
+ * Stick around in the in_multihead list;
+ * the final detach will be issued by
+ * igmp_v3_process_group_timers() when
+ * the retransmit timer expires.
+ */
+ INM_ADDREF_LOCKED(inm);
+ VERIFY(inm->inm_debug & IFD_ATTACHED);
+ inm->inm_reqcnt++;
+ VERIFY(inm->inm_reqcnt >= 1);
+ inm->inm_nrelecnt++;
+ VERIFY(inm->inm_nrelecnt != 0);
+
+ retval = igmp_v3_enqueue_group_record(
+ &inm->inm_scq, inm, 1, 0, 0);
+ itp->cst = (inm->inm_scq.ifq_len > 0);
+ KASSERT(retval != 0,
+ ("%s: enqueue record = %d\n", __func__,
+ retval));
+
+ inm->inm_state = IGMP_LEAVING_MEMBER;
+ inm->inm_sctimer = 1;
+ itp->sct = 1;
+ syncstates = 0;
+ }
+ }
+ IGI_UNLOCK(igi);
+ break;
+ case IGMP_LAZY_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ /* Our reports are suppressed; do nothing. */
+ break;
+ }
+
+ if (syncstates) {
+ inm_commit(inm);
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: T1 -> T0 for %s/%s\n", __func__,
+ _igmp_inet_buf, if_name(inm->inm_ifp)));
+ inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: T1 now MCAST_UNDEFINED for %s/%s\n",
+ __func__, _igmp_inet_buf, if_name(inm->inm_ifp)));
+ }
+}
+
+/*
+ * Enqueue an IGMPv3 group record to the given output queue.
+ *
+ * XXX This function could do with having the allocation code
+ * split out, and the multiple-tree-walks coalesced into a single
+ * routine as has been done in igmp_v3_enqueue_filter_change().
+ *
+ * If is_state_change is zero, a current-state record is appended.
+ * If is_state_change is non-zero, a state-change report is appended.
+ *
+ * If is_group_query is non-zero, an mbuf packet chain is allocated.
+ * If is_group_query is zero, and if there is a packet with free space
+ * at the tail of the queue, it will be appended to providing there
+ * is enough free space.
+ * Otherwise a new mbuf packet chain is allocated.
+ *
+ * If is_source_query is non-zero, each source is checked to see if
+ * it was recorded for a Group-Source query, and will be omitted if
+ * it is not both in-mode and recorded.
+ *
+ * The function will attempt to allocate leading space in the packet
+ * for the IP/IGMP header to be prepended without fragmenting the chain.
+ *
+ * If successful the size of all data appended to the queue is returned,
+ * otherwise an error code less than zero is returned, or zero if
+ * no record(s) were appended.
+ */
+static int
+igmp_v3_enqueue_group_record(struct ifqueue *ifq, struct in_multi *inm,
+ const int is_state_change, const int is_group_query,
+ const int is_source_query)
+{
+ struct igmp_grouprec ig;
+ struct igmp_grouprec *pig;
+ struct ifnet *ifp;
+ struct ip_msource *ims, *nims;
+ struct mbuf *m0, *m, *md;
+ int error, is_filter_list_change;
+ int minrec0len, m0srcs, msrcs, nbytes, off;
+ int record_has_sources;
+ int now;
+ int type;
+ in_addr_t naddr;
+ uint8_t mode;
+ u_int16_t ig_numsrc;
+
+ INM_LOCK_ASSERT_HELD(inm);
+ IGI_LOCK_ASSERT_HELD(inm->inm_igi);
+
+ error = 0;
+ ifp = inm->inm_ifp;
+ is_filter_list_change = 0;
+ m = NULL;
+ m0 = NULL;
+ m0srcs = 0;
+ msrcs = 0;
+ nbytes = 0;
+ nims = NULL;
+ record_has_sources = 1;
+ pig = NULL;
+ type = IGMP_DO_NOTHING;
+ mode = inm->inm_st[1].iss_fmode;
+
+ /*
+ * If we did not transition out of ASM mode during t0->t1,
+ * and there are no source nodes to process, we can skip
+ * the generation of source records.
+ */
+ if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 &&
+ inm->inm_nsrc == 0)
+ record_has_sources = 0;
+
+ if (is_state_change) {
+ /*
+ * Queue a state change record.
+ * If the mode did not change, and there are non-ASM
+ * listeners or source filters present,
+ * we potentially need to issue two records for the group.
+ * If we are transitioning to MCAST_UNDEFINED, we need
+ * not send any sources.
+ * If there are ASM listeners, and there was no filter
+ * mode transition of any kind, do nothing.
+ */
+ if (mode != inm->inm_st[0].iss_fmode) {
+ if (mode == MCAST_EXCLUDE) {
+ IGMP_PRINTF(("%s: change to EXCLUDE\n",
+ __func__));
+ type = IGMP_CHANGE_TO_EXCLUDE_MODE;
+ } else {
+ IGMP_PRINTF(("%s: change to INCLUDE\n",
+ __func__));
+ type = IGMP_CHANGE_TO_INCLUDE_MODE;
+ if (mode == MCAST_UNDEFINED)
+ record_has_sources = 0;
+ }
+ } else {
+ if (record_has_sources) {
+ is_filter_list_change = 1;
+ } else {
+ type = IGMP_DO_NOTHING;
+ }
+ }
+ } else {
+ /*
+ * Queue a current state record.
+ */
+ if (mode == MCAST_EXCLUDE) {
+ type = IGMP_MODE_IS_EXCLUDE;
+ } else if (mode == MCAST_INCLUDE) {
+ type = IGMP_MODE_IS_INCLUDE;
+ VERIFY(inm->inm_st[1].iss_asm == 0);
+ }
+ }
+
+ /*
+ * Generate the filter list changes using a separate function.
+ */
+ if (is_filter_list_change)
+ return (igmp_v3_enqueue_filter_change(ifq, inm));
+
+ if (type == IGMP_DO_NOTHING) {
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: nothing to do for %s/%s\n",
+ __func__, _igmp_inet_buf,
+ if_name(inm->inm_ifp)));
+ return (0);
+ }
+
+ /*
+ * If any sources are present, we must be able to fit at least
+ * one in the trailing space of the tail packet's mbuf,
+ * ideally more.
+ */
+ minrec0len = sizeof(struct igmp_grouprec);
+ if (record_has_sources)
+ minrec0len += sizeof(in_addr_t);
+
+ IGMP_INET_PRINTF(inm->inm_addr,
+ ("%s: queueing %s for %s/%s\n", __func__,
+ igmp_rec_type_to_str(type), _igmp_inet_buf,
+ if_name(inm->inm_ifp)));
+
+ /*
+ * Check if we have a packet in the tail of the queue for this
+ * group into which the first group record for this group will fit.
+ * Otherwise allocate a new packet.
+ * Always allocate leading space for IP+RA_OPT+IGMP+REPORT.
+ * Note: Group records for G/GSR query responses MUST be sent
+ * in their own packet.
+ */
+ m0 = ifq->ifq_tail;
+ if (!is_group_query &&
+ m0 != NULL &&
+ (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) &&
+ (m0->m_pkthdr.len + minrec0len) <
+ (ifp->if_mtu - IGMP_LEADINGSPACE)) {
+ m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
+ sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
+ m = m0;
+ IGMP_PRINTF(("%s: use existing packet\n", __func__));
+ } else {
+ if (IF_QFULL(ifq)) {
+ IGMP_PRINTF(("%s: outbound queue full\n", __func__));
+ return (-ENOMEM);
+ }
+ m = NULL;
+ m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
+ sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
+ if (!is_state_change && !is_group_query) {
+ m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+ if (m)
+ m->m_data += IGMP_LEADINGSPACE;
+ }
+ if (m == NULL) {
+ m = m_gethdr(M_DONTWAIT, MT_DATA);
+ if (m)
+ MH_ALIGN(m, IGMP_LEADINGSPACE);
+ }
+ if (m == NULL)
+ return (-ENOMEM);
+
+ igmp_save_context(m, ifp);
+
+ IGMP_PRINTF(("%s: allocated first packet\n", __func__));
+ }
+
+ /*
+ * Append group record.
+ * If we have sources, we don't know how many yet.
+ */
+ ig.ig_type = type;
+ ig.ig_datalen = 0;
+ ig.ig_numsrc = 0;
+ ig.ig_group = inm->inm_addr;
+ if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
+ if (m != m0)
+ m_freem(m);
+ IGMP_PRINTF(("%s: m_append() failed.\n", __func__));
+ return (-ENOMEM);
+ }
+ nbytes += sizeof(struct igmp_grouprec);
+
+ /*
+ * Append as many sources as will fit in the first packet.
+ * If we are appending to a new packet, the chain allocation
+ * may potentially use clusters; use m_getptr() in this case.
+ * If we are appending to an existing packet, we need to obtain
+ * a pointer to the group record after m_append(), in case a new
+ * mbuf was allocated.
+ * Only append sources which are in-mode at t1. If we are
+ * transitioning to MCAST_UNDEFINED state on the group, do not
+ * include source entries.
+ * Only report recorded sources in our filter set when responding
+ * to a group-source query.
+ */
+ if (record_has_sources) {
+ if (m == m0) {
+ md = m_last(m);
+ pig = (struct igmp_grouprec *)(void *)
+ (mtod(md, uint8_t *) + md->m_len - nbytes);
+ } else {
+ md = m_getptr(m, 0, &off);
+ pig = (struct igmp_grouprec *)(void *)
+ (mtod(md, uint8_t *) + off);
+ }
+ msrcs = 0;
+ RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) {
+#ifdef IGMP_DEBUG
+ char buf[MAX_IPv4_STR_LEN];
+
+ inet_ntop_haddr(ims->ims_haddr, buf, sizeof(buf));
+ IGMP_PRINTF(("%s: visit node %s\n", __func__, buf));
+#endif
+ now = ims_get_mode(inm, ims, 1);
+ IGMP_PRINTF(("%s: node is %d\n", __func__, now));
+ if ((now != mode) ||
+ (now == mode && mode == MCAST_UNDEFINED)) {
+ IGMP_PRINTF(("%s: skip node\n", __func__));
+ continue;
+ }
+ if (is_source_query && ims->ims_stp == 0) {
+ IGMP_PRINTF(("%s: skip unrecorded node\n",
+ __func__));
+ continue;
+ }
+ IGMP_PRINTF(("%s: append node\n", __func__));
+ naddr = htonl(ims->ims_haddr);
+ if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
+ if (m != m0)
+ m_freem(m);
+ IGMP_PRINTF(("%s: m_append() failed.\n",
+ __func__));
+ return (-ENOMEM);
+ }
+ nbytes += sizeof(in_addr_t);
+ ++msrcs;
+ if (msrcs == m0srcs)
+ break;
+ }
+ IGMP_PRINTF(("%s: msrcs is %d this packet\n", __func__,
+ msrcs));
+ ig_numsrc = htons(msrcs);
+ bcopy(&ig_numsrc, &pig->ig_numsrc, sizeof (ig_numsrc));
+ nbytes += (msrcs * sizeof(in_addr_t));
+ }
+
+ if (is_source_query && msrcs == 0) {
+ IGMP_PRINTF(("%s: no recorded sources to report\n", __func__));
+ if (m != m0)
+ m_freem(m);
+ return (0);
+ }
+
+ /*
+ * We are good to go with first packet.
+ */
+ if (m != m0) {
+ IGMP_PRINTF(("%s: enqueueing first packet\n", __func__));
+ m->m_pkthdr.vt_nrecs = 1;
+ IF_ENQUEUE(ifq, m);
+ } else {
+ m->m_pkthdr.vt_nrecs++;
+ }
+ /*
+ * No further work needed if no source list in packet(s).
+ */
+ if (!record_has_sources)
+ return (nbytes);
+
+ /*
+ * Whilst sources remain to be announced, we need to allocate
+ * a new packet and fill out as many sources as will fit.
+ * Always try for a cluster first.
+ */
+ while (nims != NULL) {
+ if (IF_QFULL(ifq)) {
+ IGMP_PRINTF(("%s: outbound queue full\n", __func__));
+ return (-ENOMEM);
+ }
+ m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+ if (m)
+ m->m_data += IGMP_LEADINGSPACE;
+ if (m == NULL) {
+ m = m_gethdr(M_DONTWAIT, MT_DATA);
+ if (m)
+ MH_ALIGN(m, IGMP_LEADINGSPACE);
+ }
+ if (m == NULL)
+ return (-ENOMEM);
+ igmp_save_context(m, ifp);
+ md = m_getptr(m, 0, &off);
+ pig = (struct igmp_grouprec *)(void *)
+ (mtod(md, uint8_t *) + off);
+ IGMP_PRINTF(("%s: allocated next packet\n", __func__));
+
+ if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
+ if (m != m0)
+ m_freem(m);
+ IGMP_PRINTF(("%s: m_append() failed.\n", __func__));
+ return (-ENOMEM);
+ }
+ m->m_pkthdr.vt_nrecs = 1;
+ nbytes += sizeof(struct igmp_grouprec);
+
+ m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
+ sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
+
+ msrcs = 0;
+ RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
+#ifdef IGMP_DEBUG
+ char buf[MAX_IPv4_STR_LEN];
+
+ inet_ntop_haddr(ims->ims_haddr, buf, sizeof(buf));
+ IGMP_PRINTF(("%s: visit node %s\n", __func__, buf));
+#endif
+ now = ims_get_mode(inm, ims, 1);
+ if ((now != mode) ||
+ (now == mode && mode == MCAST_UNDEFINED)) {
+ IGMP_PRINTF(("%s: skip node\n", __func__));
+ continue;
+ }
+ if (is_source_query && ims->ims_stp == 0) {
+ IGMP_PRINTF(("%s: skip unrecorded node\n",
+ __func__));
+ continue;
+ }
+ IGMP_PRINTF(("%s: append node\n", __func__));
+ naddr = htonl(ims->ims_haddr);
+ if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
+ if (m != m0)
+ m_freem(m);
+ IGMP_PRINTF(("%s: m_append() failed.\n",
+ __func__));
+ return (-ENOMEM);
+ }
+ ++msrcs;
+ if (msrcs == m0srcs)
+ break;
+ }
+ ig_numsrc = htons(msrcs);
+ bcopy(&ig_numsrc, &pig->ig_numsrc, sizeof (ig_numsrc));
+ nbytes += (msrcs * sizeof(in_addr_t));
+
+ IGMP_PRINTF(("%s: enqueueing next packet\n", __func__));
+ IF_ENQUEUE(ifq, m);
+ }
+
+ return (nbytes);
+}
+
+/*
+ * Type used to mark record pass completion.
+ * We exploit the fact we can cast to this easily from the
+ * current filter modes on each ip_msource node.
+ */
+typedef enum {
+ REC_NONE = 0x00, /* MCAST_UNDEFINED */
+ REC_ALLOW = 0x01, /* MCAST_INCLUDE */
+ REC_BLOCK = 0x02, /* MCAST_EXCLUDE */
+ REC_FULL = REC_ALLOW | REC_BLOCK
+} rectype_t;
+
+/*
+ * Enqueue an IGMPv3 filter list change to the given output queue.
+ *
+ * Source list filter state is held in an RB-tree. When the filter list
+ * for a group is changed without changing its mode, we need to compute
+ * the deltas between T0 and T1 for each source in the filter set,
+ * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records.
+ *
+ * As we may potentially queue two record types, and the entire R-B tree
+ * needs to be walked at once, we break this out into its own function
+ * so we can generate a tightly packed queue of packets.
+ *
+ * XXX This could be written to only use one tree walk, although that makes
+ * serializing into the mbuf chains a bit harder. For now we do two walks
+ * which makes things easier on us, and it may or may not be harder on
+ * the L2 cache.
+ *
+ * If successful the size of all data appended to the queue is returned,
+ * otherwise an error code less than zero is returned, or zero if
+ * no record(s) were appended.
+ */
+static int
+igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
+{
+ static const int MINRECLEN =
+ sizeof(struct igmp_grouprec) + sizeof(in_addr_t);
+ struct ifnet *ifp;
+ struct igmp_grouprec ig;
+ struct igmp_grouprec *pig;
+ struct ip_msource *ims, *nims;
+ struct mbuf *m, *m0, *md;
+ in_addr_t naddr;
+ int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
+ int nallow, nblock;
+ uint8_t mode, now, then;
+ rectype_t crt, drt, nrt;
+ u_int16_t ig_numsrc;
+
+ INM_LOCK_ASSERT_HELD(inm);
+
+ if (inm->inm_nsrc == 0 ||
+ (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0))
+ return (0);
+
+ ifp = inm->inm_ifp; /* interface */
+ mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */
+ crt = REC_NONE; /* current group record type */
+ drt = REC_NONE; /* mask of completed group record types */
+ nrt = REC_NONE; /* record type for current node */
+ m0srcs = 0; /* # source which will fit in current mbuf chain */
+ nbytes = 0; /* # of bytes appended to group's state-change queue */
+ npbytes = 0; /* # of bytes appended this packet */
+ rsrcs = 0; /* # sources encoded in current record */
+ schanged = 0; /* # nodes encoded in overall filter change */
+ nallow = 0; /* # of source entries in ALLOW_NEW */
+ nblock = 0; /* # of source entries in BLOCK_OLD */
+ nims = NULL; /* next tree node pointer */
+
+ /*
+ * For each possible filter record mode.
+ * The first kind of source we encounter tells us which
+ * is the first kind of record we start appending.
+ * If a node transitioned to UNDEFINED at t1, its mode is treated
+ * as the inverse of the group's filter mode.
+ */
+ while (drt != REC_FULL) {
+ do {
+ m0 = ifq->ifq_tail;
+ if (m0 != NULL &&
+ (m0->m_pkthdr.vt_nrecs + 1 <=
+ IGMP_V3_REPORT_MAXRECS) &&
+ (m0->m_pkthdr.len + MINRECLEN) <
+ (ifp->if_mtu - IGMP_LEADINGSPACE)) {
+ m = m0;
+ m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
+ sizeof(struct igmp_grouprec)) /
+ sizeof(in_addr_t);
+ IGMP_PRINTF(("%s: use previous packet\n",
+ __func__));
+ } else {
+ m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+ if (m)
+ m->m_data += IGMP_LEADINGSPACE;
+ if (m == NULL) {
+ m = m_gethdr(M_DONTWAIT, MT_DATA);
+ if (m)
+ MH_ALIGN(m, IGMP_LEADINGSPACE);
+ }
+ if (m == NULL) {
+ IGMP_PRINTF(("%s: m_get*() failed\n",
+ __func__));
+ return (-ENOMEM);
+ }
+ m->m_pkthdr.vt_nrecs = 0;
+ igmp_save_context(m, ifp);
+ m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
+ sizeof(struct igmp_grouprec)) /
+ sizeof(in_addr_t);
+ npbytes = 0;
+ IGMP_PRINTF(("%s: allocated new packet\n",
+ __func__));
+ }
+ /*
+ * Append the IGMP group record header to the
+ * current packet's data area.
+ * Recalculate pointer to free space for next
+ * group record, in case m_append() allocated
+ * a new mbuf or cluster.
+ */
+ memset(&ig, 0, sizeof(ig));
+ ig.ig_group = inm->inm_addr;
+ if (!m_append(m, sizeof(ig), (void *)&ig)) {
+ if (m != m0)
+ m_freem(m);
+ IGMP_PRINTF(("%s: m_append() failed\n",
+ __func__));
+ return (-ENOMEM);
+ }
+ npbytes += sizeof(struct igmp_grouprec);
+ if (m != m0) {
+ /* new packet; offset in c hain */
+ md = m_getptr(m, npbytes -
+ sizeof(struct igmp_grouprec), &off);
+ pig = (struct igmp_grouprec *)(void *)(mtod(md,
+ uint8_t *) + off);
+ } else {
+ /* current packet; offset from last append */
+ md = m_last(m);
+ pig = (struct igmp_grouprec *)(void *)(mtod(md,
+ uint8_t *) + md->m_len -
+ sizeof(struct igmp_grouprec));
+ }
+ /*
+ * Begin walking the tree for this record type
+ * pass, or continue from where we left off
+ * previously if we had to allocate a new packet.
+ * Only report deltas in-mode at t1.
+ * We need not report included sources as allowed
+ * if we are in inclusive mode on the group,
+ * however the converse is not true.
+ */
+ rsrcs = 0;
+ if (nims == NULL)
+ nims = RB_MIN(ip_msource_tree, &inm->inm_srcs);
+ RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
+#ifdef IGMP_DEBUG
+ char buf[MAX_IPv4_STR_LEN];
+
+ inet_ntop_haddr(ims->ims_haddr, buf, sizeof(buf));
+ IGMP_PRINTF(("%s: visit node %s\n", __func__, buf));
+#endif
+ now = ims_get_mode(inm, ims, 1);
+ then = ims_get_mode(inm, ims, 0);
+ IGMP_PRINTF(("%s: mode: t0 %d, t1 %d\n",
+ __func__, then, now));
+ if (now == then) {
+ IGMP_PRINTF(("%s: skip unchanged\n",
+ __func__));
+ continue;
+ }
+ if (mode == MCAST_EXCLUDE &&
+ now == MCAST_INCLUDE) {
+ IGMP_PRINTF(("%s: skip IN src on EX "
+ "group\n", __func__));
+ continue;
+ }
+ nrt = (rectype_t)now;
+ if (nrt == REC_NONE)
+ nrt = (rectype_t)(~mode & REC_FULL);
+ if (schanged++ == 0) {
+ crt = nrt;
+ } else if (crt != nrt)
+ continue;
+ naddr = htonl(ims->ims_haddr);
+ if (!m_append(m, sizeof(in_addr_t),
+ (void *)&naddr)) {
+ if (m != m0)
+ m_freem(m);
+ IGMP_PRINTF(("%s: m_append() failed\n",
+ __func__));
+ return (-ENOMEM);
+ }
+ nallow += !!(crt == REC_ALLOW);
+ nblock += !!(crt == REC_BLOCK);
+ if (++rsrcs == m0srcs)
+ break;
+ }
+ /*
+ * If we did not append any tree nodes on this
+ * pass, back out of allocations.
+ */
+ if (rsrcs == 0) {
+ npbytes -= sizeof(struct igmp_grouprec);
+ if (m != m0) {
+ IGMP_PRINTF(("%s: m_free(m)\n",
+ __func__));
+ m_freem(m);
+ } else {
+ IGMP_PRINTF(("%s: m_adj(m, -ig)\n",
+ __func__));
+ m_adj(m, -((int)sizeof(
+ struct igmp_grouprec)));
+ }
+ continue;
+ }
+ npbytes += (rsrcs * sizeof(in_addr_t));
+ if (crt == REC_ALLOW)
+ pig->ig_type = IGMP_ALLOW_NEW_SOURCES;
+ else if (crt == REC_BLOCK)
+ pig->ig_type = IGMP_BLOCK_OLD_SOURCES;
+ ig_numsrc = htons(rsrcs);
+ bcopy(&ig_numsrc, &pig->ig_numsrc, sizeof (ig_numsrc));
+ /*
+ * Count the new group record, and enqueue this
+ * packet if it wasn't already queued.
+ */
+ m->m_pkthdr.vt_nrecs++;
+ if (m != m0)
+ IF_ENQUEUE(ifq, m);
+ nbytes += npbytes;
+ } while (nims != NULL);
+ drt |= crt;
+ crt = (~crt & REC_FULL);
+ }
+
+ IGMP_PRINTF(("%s: queued %d ALLOW_NEW, %d BLOCK_OLD\n", __func__,
+ nallow, nblock));
+
+ return (nbytes);
+}
+
+static int
+igmp_v3_merge_state_changes(struct in_multi *inm, struct ifqueue *ifscq)
+{
+ struct ifqueue *gq;
+ struct mbuf *m; /* pending state-change */
+ struct mbuf *m0; /* copy of pending state-change */
+ struct mbuf *mt; /* last state-change in packet */
+ struct mbuf *n;
+ int docopy, domerge;
+ u_int recslen;
+
+ INM_LOCK_ASSERT_HELD(inm);
+
+ docopy = 0;
+ domerge = 0;
+ recslen = 0;
+
+ /*
+ * If there are further pending retransmissions, make a writable
+ * copy of each queued state-change message before merging.
+ */
+ if (inm->inm_scrv > 0)
+ docopy = 1;
+
+ gq = &inm->inm_scq;
+#ifdef IGMP_DEBUG
+ if (gq->ifq_head == NULL) {
+ IGMP_PRINTF(("%s: WARNING: queue for inm 0x%llx is empty\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(inm)));
+ }
+#endif
+
+ /*
+ * Use IF_REMQUEUE() instead of IF_DEQUEUE() below, since the
+ * packet might not always be at the head of the ifqueue.
+ */
+ m = gq->ifq_head;
+ while (m != NULL) {
+ /*
+ * Only merge the report into the current packet if
+ * there is sufficient space to do so; an IGMPv3 report
+ * packet may only contain 65,535 group records.
+ * Always use a simple mbuf chain concatentation to do this,
+ * as large state changes for single groups may have
+ * allocated clusters.
+ */
+ domerge = 0;
+ mt = ifscq->ifq_tail;
+ if (mt != NULL) {
+ recslen = m_length(m);
+
+ if ((mt->m_pkthdr.vt_nrecs +
+ m->m_pkthdr.vt_nrecs <=
+ IGMP_V3_REPORT_MAXRECS) &&
+ (mt->m_pkthdr.len + recslen <=
+ (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE)))
+ domerge = 1;
+ }
+
+ if (!domerge && IF_QFULL(gq)) {
+ IGMP_PRINTF(("%s: outbound queue full, skipping whole "
+ "packet 0x%llx\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m)));
+ n = m->m_nextpkt;
+ if (!docopy) {
+ IF_REMQUEUE(gq, m);
+ m_freem(m);
+ }
+ m = n;
+ continue;
+ }
+
+ if (!docopy) {
+ IGMP_PRINTF(("%s: dequeueing 0x%llx\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m)));
+ n = m->m_nextpkt;
+ IF_REMQUEUE(gq, m);
+ m0 = m;
+ m = n;
+ } else {
+ IGMP_PRINTF(("%s: copying 0x%llx\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m)));
+ m0 = m_dup(m, M_NOWAIT);
+ if (m0 == NULL)
+ return (ENOMEM);
+ m0->m_nextpkt = NULL;
+ m = m->m_nextpkt;
+ }
+
+ if (!domerge) {
+ IGMP_PRINTF(("%s: queueing 0x%llx to ifscq 0x%llx)\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(m0),
+ (uint64_t)VM_KERNEL_ADDRPERM(ifscq)));
+ IF_ENQUEUE(ifscq, m0);
+ } else {
+ struct mbuf *mtl; /* last mbuf of packet mt */
+
+ IGMP_PRINTF(("%s: merging 0x%llx with ifscq tail "
+ "0x%llx)\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m0),
+ (uint64_t)VM_KERNEL_ADDRPERM(mt)));
+
+ mtl = m_last(mt);
+ m0->m_flags &= ~M_PKTHDR;
+ mt->m_pkthdr.len += recslen;
+ mt->m_pkthdr.vt_nrecs +=
+ m0->m_pkthdr.vt_nrecs;
+
+ mtl->m_next = m0;
+ }
+ }
+
+ return (0);
+}
+
+/*
+ * Respond to a pending IGMPv3 General Query.
+ */
+static uint32_t
+igmp_v3_dispatch_general_query(struct igmp_ifinfo *igi)
+{
+ struct ifnet *ifp;
+ struct in_multi *inm;
+ struct in_multistep step;
+ int retval, loop;
+
+ IGI_LOCK_ASSERT_HELD(igi);
+
+ VERIFY(igi->igi_version == IGMP_VERSION_3);
+
+ ifp = igi->igi_ifp;
+ IGI_UNLOCK(igi);
+
+ in_multihead_lock_shared();
+ IN_FIRST_MULTI(step, inm);
+ while (inm != NULL) {
+ INM_LOCK(inm);
+ if (inm->inm_ifp != ifp)
+ goto next;
+
+ switch (inm->inm_state) {
+ case IGMP_NOT_MEMBER:
+ case IGMP_SILENT_MEMBER:
+ break;
+ case IGMP_REPORTING_MEMBER:
+ case IGMP_IDLE_MEMBER:
+ case IGMP_LAZY_MEMBER:
+ case IGMP_SLEEPING_MEMBER:
+ case IGMP_AWAKENING_MEMBER:
+ inm->inm_state = IGMP_REPORTING_MEMBER;
+ IGI_LOCK(igi);
+ retval = igmp_v3_enqueue_group_record(&igi->igi_gq,
+ inm, 0, 0, 0);
+ IGI_UNLOCK(igi);
+ IGMP_PRINTF(("%s: enqueue record = %d\n",
+ __func__, retval));
+ break;
+ case IGMP_G_QUERY_PENDING_MEMBER:
+ case IGMP_SG_QUERY_PENDING_MEMBER:
+ case IGMP_LEAVING_MEMBER:
+ break;
+ }
+next:
+ INM_UNLOCK(inm);
+ IN_NEXT_MULTI(step, inm);
+ }
+ in_multihead_lock_done();
+
+ IGI_LOCK(igi);
+ loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
+ igmp_dispatch_queue(igi, &igi->igi_gq, IGMP_MAX_RESPONSE_BURST,
+ loop);
+ IGI_LOCK_ASSERT_HELD(igi);
+ /*
+ * Slew transmission of bursts over 1 second intervals.
+ */
+ if (igi->igi_gq.ifq_head != NULL) {
+ igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY(
+ IGMP_RESPONSE_BURST_INTERVAL);
+ }
+
+ return (igi->igi_v3_timer);
+}
+
+/*
+ * Transmit the next pending IGMP message in the output queue.
+ *
+ * Must not be called with inm_lock or igi_lock held.
+ */
+static void
+igmp_sendpkt(struct mbuf *m)
+{
+ struct ip_moptions *imo;
+ struct mbuf *ipopts, *m0;
+ int error;
+ struct route ro;
+ struct ifnet *ifp;
+
+ IGMP_PRINTF(("%s: transmit 0x%llx\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m)));
+
+ ifp = igmp_restore_context(m);
+ /*
+ * Check if the ifnet is still attached.
+ */
+ if (ifp == NULL || !ifnet_is_attached(ifp, 0)) {
+ IGMP_PRINTF(("%s: dropped 0x%llx as ifp went away.\n",
+ __func__, (uint64_t)VM_KERNEL_ADDRPERM(m)));
+ m_freem(m);
+ OSAddAtomic(1, &ipstat.ips_noroute);
+ return;
+ }
+
+ ipopts = igmp_sendra ? m_raopt : NULL;
+
+ imo = ip_allocmoptions(M_WAITOK);
+ if (imo == NULL) {
+ m_freem(m);
+ return;
+ }
+
+ imo->imo_multicast_ttl = 1;
+ imo->imo_multicast_vif = -1;
+ imo->imo_multicast_loop = 0;
+
+ /*
+ * If the user requested that IGMP traffic be explicitly
+ * redirected to the loopback interface (e.g. they are running a
+ * MANET interface and the routing protocol needs to see the
+ * updates), handle this now.
+ */
+ if (m->m_flags & M_IGMP_LOOP)
+ imo->imo_multicast_ifp = lo_ifp;
+ else
+ imo->imo_multicast_ifp = ifp;
+
+ if (m->m_flags & M_IGMPV2) {
+ m0 = m;
+ } else {
+ m0 = igmp_v3_encap_report(ifp, m);
+ if (m0 == NULL) {
+ /*
+ * If igmp_v3_encap_report() failed, then M_PREPEND()
+ * already freed the original mbuf chain.
+ * This means that we don't have to m_freem(m) here.
+ */
+ IGMP_PRINTF(("%s: dropped 0x%llx\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m)));
+ IMO_REMREF(imo);
+ atomic_add_32(&ipstat.ips_odropped, 1);
+ return;
+ }
+ }
+
+ igmp_scrub_context(m0);
+ m->m_flags &= ~(M_PROTOFLAGS | M_IGMP_LOOP);
+ m0->m_pkthdr.rcvif = lo_ifp;
+#ifdef MAC
+ mac_netinet_igmp_send(ifp, m0);
+#endif
+
+ if (ifp->if_eflags & IFEF_TXSTART) {
+ /*
+ * Use control service class if the interface supports
+ * transmit-start model.
+ */
+ (void) m_set_service_class(m0, MBUF_SC_CTL);
+ }
+ bzero(&ro, sizeof (ro));
+ error = ip_output(m0, ipopts, &ro, 0, imo, NULL);
+ ROUTE_RELEASE(&ro);
+
+ IMO_REMREF(imo);
+
+ if (error) {
+ IGMP_PRINTF(("%s: ip_output(0x%llx) = %d\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m0), error));
+ return;
+ }
+
+ IGMPSTAT_INC(igps_snd_reports);
+ OIGMPSTAT_INC(igps_snd_reports);
+}
+/*
+ * Encapsulate an IGMPv3 report.
+ *
+ * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf
+ * chain has already had its IP/IGMPv3 header prepended. In this case
+ * the function will not attempt to prepend; the lengths and checksums
+ * will however be re-computed.
+ *
+ * Returns a pointer to the new mbuf chain head, or NULL if the
+ * allocation failed.
+ */
+static struct mbuf *
+igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m)
+{
+ struct igmp_report *igmp;
+ struct ip *ip;
+ int hdrlen, igmpreclen;
+
+ VERIFY((m->m_flags & M_PKTHDR));
+
+ igmpreclen = m_length(m);
+ hdrlen = sizeof(struct ip) + sizeof(struct igmp_report);
+
+ if (m->m_flags & M_IGMPV3_HDR) {
+ igmpreclen -= hdrlen;
+ } else {
+ M_PREPEND(m, hdrlen, M_DONTWAIT, 1);
+ if (m == NULL)
+ return (NULL);
+ m->m_flags |= M_IGMPV3_HDR;
+ }
+
+ IGMP_PRINTF(("%s: igmpreclen is %d\n", __func__, igmpreclen));
+
+ m->m_data += sizeof(struct ip);
+ m->m_len -= sizeof(struct ip);
+
+ igmp = mtod(m, struct igmp_report *);
+ igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT;
+ igmp->ir_rsv1 = 0;
+ igmp->ir_rsv2 = 0;
+ igmp->ir_numgrps = htons(m->m_pkthdr.vt_nrecs);
+ igmp->ir_cksum = 0;
+ igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen);
+ m->m_pkthdr.vt_nrecs = 0;
+
+ m->m_data -= sizeof(struct ip);
+ m->m_len += sizeof(struct ip);
+
+ ip = mtod(m, struct ip *);
+ ip->ip_tos = IPTOS_PREC_INTERNETCONTROL;
+ ip->ip_len = hdrlen + igmpreclen;
+ ip->ip_off = IP_DF;
+ ip->ip_p = IPPROTO_IGMP;
+ ip->ip_sum = 0;
+
+ ip->ip_src.s_addr = INADDR_ANY;
+
+ if (m->m_flags & M_IGMP_LOOP) {
+ struct in_ifaddr *ia;
+
+ IFP_TO_IA(ifp, ia);
+ if (ia != NULL) {
+ IFA_LOCK(&ia->ia_ifa);
+ ip->ip_src = ia->ia_addr.sin_addr;
+ IFA_UNLOCK(&ia->ia_ifa);
+ IFA_REMREF(&ia->ia_ifa);
+ }
+ }
+
+ ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP);
+
+ return (m);
+}
+
+#ifdef IGMP_DEBUG
+static const char *
+igmp_rec_type_to_str(const int type)
+{
+ switch (type) {
+ case IGMP_CHANGE_TO_EXCLUDE_MODE:
+ return "TO_EX";
+ break;
+ case IGMP_CHANGE_TO_INCLUDE_MODE:
+ return "TO_IN";
+ break;
+ case IGMP_MODE_IS_EXCLUDE:
+ return "MODE_EX";
+ break;
+ case IGMP_MODE_IS_INCLUDE:
+ return "MODE_IN";
+ break;
+ case IGMP_ALLOW_NEW_SOURCES:
+ return "ALLOW_NEW";
+ break;
+ case IGMP_BLOCK_OLD_SOURCES:
+ return "BLOCK_OLD";
+ break;
+ default:
+ break;
+ }
+ return "unknown";
+}
+#endif
+
+void
+igmp_init(struct protosw *pp, struct domain *dp)
+{
+#pragma unused(dp)
+ static int igmp_initialized = 0;
+
+ VERIFY((pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED);
+
+ if (igmp_initialized)
+ return;
+ igmp_initialized = 1;
+
+ IGMP_PRINTF(("%s: initializing\n", __func__));
+
+ igmp_timers_are_running = 0;
+
+ /* Setup lock group and attribute for igmp_mtx */
+ igmp_mtx_grp_attr = lck_grp_attr_alloc_init();
+ igmp_mtx_grp = lck_grp_alloc_init("igmp_mtx", igmp_mtx_grp_attr);
+ igmp_mtx_attr = lck_attr_alloc_init();
+ lck_mtx_init(&igmp_mtx, igmp_mtx_grp, igmp_mtx_attr);
+
+ LIST_INIT(&igi_head);
+ m_raopt = igmp_ra_alloc();
+
+ igi_size = sizeof (struct igmp_ifinfo);
+ igi_zone = zinit(igi_size, IGI_ZONE_MAX * igi_size,
+ 0, IGI_ZONE_NAME);
+ if (igi_zone == NULL) {
+ panic("%s: failed allocating %s", __func__, IGI_ZONE_NAME);
+ /* NOTREACHED */
+ }
+ zone_change(igi_zone, Z_EXPAND, TRUE);
+ zone_change(igi_zone, Z_CALLERACCT, FALSE);
+}
projects / apple / xnu.git / blobdiff