Make in-kernel multicast protocols for pfsync and carp work after enabling

dynamic resizing of multicast membership array.

Reported and testing by:	Maxim Konovalov, Scott Ullrich
Reminded by:			thompsa
MFC after:			2 weeks

sys/contrib/pf/net/if_pfsync.c

@@ -200,6 +200,7 @@ pfsync_clone_destroy(struct ifnet *ifp)
         if_detach(ifp);
 	if_free(ifp);
         LIST_REMOVE(sc, sc_next);
+        free(sc->sc_imo.imo_membership, M_PFSYNC);
         free(sc, M_PFSYNC);
 }
 
@@ -227,6 +228,10 @@ pfsync_clone_create(struct if_clone *ifc, int unit)
 	sc->sc_sendaddr.s_addr = htonl(INADDR_PFSYNC_GROUP);
 	sc->sc_ureq_received = 0;
 	sc->sc_ureq_sent = 0;
+	sc->sc_imo.imo_membership = (struct in_multi **)malloc(
+	    (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_PFSYNC,
+	    M_WAITOK);
+	sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
 
 	ifp = SCP2IFP(sc);
 	if_initname(ifp, ifc->ifc_name, unit);

sys/netinet/ip_carp.c

@@ -375,6 +375,10 @@ carp_clone_create(struct if_clone *ifc, int unit)
 #ifdef INET6
 	sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
 #endif
+	sc->sc_imo.imo_membership = (struct in_multi **)malloc(
+	    (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
+	    M_WAITOK);
+	sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
 
 	callout_init(&sc->sc_ad_tmo, NET_CALLOUT_MPSAFE);
 	callout_init(&sc->sc_md_tmo, NET_CALLOUT_MPSAFE);
@@ -415,6 +419,7 @@ carp_clone_destroy(struct ifnet *ifp)
 	bpfdetach(ifp);
 	if_detach(ifp);
 	if_free_type(ifp, IFT_ETHER);
+	free(sc->sc_imo.imo_membership, M_CARP);
 	free(sc, M_CARP);
 }