/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1990 Mentat Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* igmpv3/mldv2 source filter manipulation */ static void ilm_bld_flists(conn_t *conn, void *arg); static void ilm_gen_filter(ilm_t *ilm, mcast_record_t *fmode, slist_t *flist); static ilm_t *ilm_add(ill_t *ill, const in6_addr_t *group, ilg_stat_t ilgstat, mcast_record_t ilg_fmode, slist_t *ilg_flist, zoneid_t zoneid); static void ilm_delete(ilm_t *ilm); static int ilm_numentries(ill_t *, const in6_addr_t *); static ilm_t *ip_addmulti_serial(const in6_addr_t *, ill_t *, zoneid_t, ilg_stat_t, mcast_record_t, slist_t *, int *); static ilm_t *ip_addmulti_impl(const in6_addr_t *, ill_t *, zoneid_t, ilg_stat_t, mcast_record_t, slist_t *, int *); static int ip_delmulti_serial(ilm_t *, boolean_t, boolean_t); static int ip_delmulti_impl(ilm_t *, boolean_t, boolean_t); static int ip_ll_multireq(ill_t *ill, const in6_addr_t *group, t_uscalar_t); static ilg_t *ilg_lookup(conn_t *, const in6_addr_t *, ipaddr_t ifaddr, uint_t ifindex); static int ilg_add(conn_t *connp, const in6_addr_t *group, ipaddr_t ifaddr, uint_t ifindex, ill_t *ill, mcast_record_t fmode, const in6_addr_t *v6src); static void ilg_delete(conn_t *connp, ilg_t *ilg, const in6_addr_t *src); static mblk_t *ill_create_dl(ill_t *ill, uint32_t dl_primitive, uint32_t *addr_lenp, uint32_t *addr_offp); static int ip_opt_delete_group_excl(conn_t *connp, const in6_addr_t *v6group, ipaddr_t ifaddr, uint_t ifindex, mcast_record_t fmode, const in6_addr_t *v6src); static ilm_t *ilm_lookup(ill_t *, const in6_addr_t *, zoneid_t); static int ip_msfilter_ill(conn_t *, mblk_t *, const ip_ioctl_cmd_t *, ill_t **); static void ilg_check_detach(conn_t *, ill_t *); static void ilg_check_reattach(conn_t *); /* * MT notes: * * Multicast joins operate on both the ilg and ilm structures. Multiple * threads operating on an conn (socket) trying to do multicast joins * need to synchronize when operating on the ilg. Multiple threads * potentially operating on different conn (socket endpoints) trying to * do multicast joins could eventually end up trying to manipulate the * ilm simulatenously and need to synchronize on the access to the ilm. * The access and lookup of the ilm, as well as other ill multicast state, * is under ill_mcast_lock. * The modifications and lookup of ilg entries is serialized using conn_ilg_lock * rwlock. An ilg will not be freed until ilg_refcnt drops to zero. * * In some cases we hold ill_mcast_lock and then acquire conn_ilg_lock, but * never the other way around. * * An ilm is an IP data structure used to track multicast join/leave. * An ilm is associated with a tuple in IPv4 and * with just in IPv6. ilm_refcnt is the number of ilg's * referencing the ilm. * The modifications and lookup of ilm entries is serialized using the * ill_mcast_lock rwlock; that lock handles all the igmp/mld modifications * of the ilm state. * ilms are created / destroyed only as writer. ilms * are not passed around. The datapath (anything outside of this file * and igmp.c) use functions that do not return ilms - just the number * of members. So we don't need a dynamic refcount of the number * of threads holding reference to an ilm. * * In the cases where we serially access the ilg and ilm, which happens when * we handle the applications requests to join or leave groups and sources, * we use the ill_mcast_serializer mutex to ensure that a multithreaded * application which does concurrent joins and/or leaves on the same group on * the same socket always results in a consistent order for the ilg and ilm * modifications. * * When a multicast operation results in needing to send a message to * the driver (to join/leave a L2 multicast address), we use ill_dlpi_queue() * which serialized the DLPI requests. The IGMP/MLD code uses ill_mcast_queue() * to send IGMP/MLD IP packet to avoid dropping the lock just to send a packet. */ #define GETSTRUCT(structure, number) \ ((structure *)mi_zalloc(sizeof (structure) * (number))) /* * Caller must ensure that the ilg has not been condemned * The condemned flag is only set in ilg_delete under conn_ilg_lock. * * The caller must hold conn_ilg_lock as writer. */ static void ilg_refhold(ilg_t *ilg) { ASSERT(ilg->ilg_refcnt != 0); ASSERT(!ilg->ilg_condemned); ASSERT(RW_WRITE_HELD(&ilg->ilg_connp->conn_ilg_lock)); ilg->ilg_refcnt++; } static void ilg_inactive(ilg_t *ilg) { ASSERT(ilg->ilg_ill == NULL); ASSERT(ilg->ilg_ilm == NULL); ASSERT(ilg->ilg_filter == NULL); ASSERT(ilg->ilg_condemned); /* Unlink from list */ *ilg->ilg_ptpn = ilg->ilg_next; if (ilg->ilg_next != NULL) ilg->ilg_next->ilg_ptpn = ilg->ilg_ptpn; ilg->ilg_next = NULL; ilg->ilg_ptpn = NULL; ilg->ilg_connp = NULL; kmem_free(ilg, sizeof (*ilg)); } /* * The caller must hold conn_ilg_lock as writer. */ static void ilg_refrele(ilg_t *ilg) { ASSERT(RW_WRITE_HELD(&ilg->ilg_connp->conn_ilg_lock)); ASSERT(ilg->ilg_refcnt != 0); if (--ilg->ilg_refcnt == 0) ilg_inactive(ilg); } /* * Acquire reference on ilg and drop reference on held_ilg. * In the case when held_ilg is the same as ilg we already have * a reference, but the held_ilg might be condemned. In that case * we avoid the ilg_refhold/rele so that we can assert in ire_refhold * that the ilg isn't condemned. */ static void ilg_transfer_hold(ilg_t *held_ilg, ilg_t *ilg) { if (held_ilg == ilg) return; ilg_refhold(ilg); if (held_ilg != NULL) ilg_refrele(held_ilg); } /* * Allocate a new ilg_t and links it into conn_ilg. * Returns NULL on failure, in which case `*errp' will be * filled in with the reason. * * Assumes connp->conn_ilg_lock is held. */ static ilg_t * conn_ilg_alloc(conn_t *connp, int *errp) { ilg_t *ilg; ASSERT(RW_WRITE_HELD(&connp->conn_ilg_lock)); /* * If CONN_CLOSING is set, conn_ilg cleanup has begun and we must not * create any ilgs. */ if (connp->conn_state_flags & CONN_CLOSING) { *errp = EINVAL; return (NULL); } ilg = kmem_zalloc(sizeof (ilg_t), KM_NOSLEEP); if (ilg == NULL) { *errp = ENOMEM; return (NULL); } ilg->ilg_refcnt = 1; /* Insert at head */ if (connp->conn_ilg != NULL) connp->conn_ilg->ilg_ptpn = &ilg->ilg_next; ilg->ilg_next = connp->conn_ilg; ilg->ilg_ptpn = &connp->conn_ilg; connp->conn_ilg = ilg; ilg->ilg_connp = connp; return (ilg); } typedef struct ilm_fbld_s { ilm_t *fbld_ilm; int fbld_in_cnt; int fbld_ex_cnt; slist_t fbld_in; slist_t fbld_ex; boolean_t fbld_in_overflow; } ilm_fbld_t; /* * Caller must hold ill_mcast_lock */ static void ilm_bld_flists(conn_t *connp, void *arg) { ilg_t *ilg; ilm_fbld_t *fbld = (ilm_fbld_t *)(arg); ilm_t *ilm = fbld->fbld_ilm; in6_addr_t *v6group = &ilm->ilm_v6addr; if (connp->conn_ilg == NULL) return; /* * Since we can't break out of the ipcl_walk once started, we still * have to look at every conn. But if we've already found one * (EXCLUDE, NULL) list, there's no need to keep checking individual * ilgs--that will be our state. */ if (fbld->fbld_ex_cnt > 0 && fbld->fbld_ex.sl_numsrc == 0) return; /* * Check this conn's ilgs to see if any are interested in our * ilm (group, interface match). If so, update the master * include and exclude lists we're building in the fbld struct * with this ilg's filter info. * * Note that the caller has already serialized on the ill we care * about. */ ASSERT(MUTEX_HELD(&ilm->ilm_ill->ill_mcast_serializer)); rw_enter(&connp->conn_ilg_lock, RW_READER); for (ilg = connp->conn_ilg; ilg != NULL; ilg = ilg->ilg_next) { if (ilg->ilg_condemned) continue; /* * Since we are under the ill_mcast_serializer we know * that any ilg+ilm operations on this ilm have either * not started or completed, except for the last ilg * (the one that caused us to be called) which doesn't * have ilg_ilm set yet. Hence we compare using ilg_ill * and the address. */ if ((ilg->ilg_ill == ilm->ilm_ill) && IN6_ARE_ADDR_EQUAL(&ilg->ilg_v6group, v6group)) { if (ilg->ilg_fmode == MODE_IS_INCLUDE) { fbld->fbld_in_cnt++; if (!fbld->fbld_in_overflow) l_union_in_a(&fbld->fbld_in, ilg->ilg_filter, &fbld->fbld_in_overflow); } else { fbld->fbld_ex_cnt++; /* * On the first exclude list, don't try to do * an intersection, as the master exclude list * is intentionally empty. If the master list * is still empty on later iterations, that * means we have at least one ilg with an empty * exclude list, so that should be reflected * when we take the intersection. */ if (fbld->fbld_ex_cnt == 1) { if (ilg->ilg_filter != NULL) l_copy(ilg->ilg_filter, &fbld->fbld_ex); } else { l_intersection_in_a(&fbld->fbld_ex, ilg->ilg_filter); } } /* there will only be one match, so break now. */ break; } } rw_exit(&connp->conn_ilg_lock); } /* * Caller must hold ill_mcast_lock */ static void ilm_gen_filter(ilm_t *ilm, mcast_record_t *fmode, slist_t *flist) { ilm_fbld_t fbld; ip_stack_t *ipst = ilm->ilm_ipst; fbld.fbld_ilm = ilm; fbld.fbld_in_cnt = fbld.fbld_ex_cnt = 0; fbld.fbld_in.sl_numsrc = fbld.fbld_ex.sl_numsrc = 0; fbld.fbld_in_overflow = B_FALSE; /* first, construct our master include and exclude lists */ ipcl_walk(ilm_bld_flists, (caddr_t)&fbld, ipst); /* now use those master lists to generate the interface filter */ /* if include list overflowed, filter is (EXCLUDE, NULL) */ if (fbld.fbld_in_overflow) { *fmode = MODE_IS_EXCLUDE; flist->sl_numsrc = 0; return; } /* if nobody interested, interface filter is (INCLUDE, NULL) */ if (fbld.fbld_in_cnt == 0 && fbld.fbld_ex_cnt == 0) { *fmode = MODE_IS_INCLUDE; flist->sl_numsrc = 0; return; } /* * If there are no exclude lists, then the interface filter * is INCLUDE, with its filter list equal to fbld_in. A single * exclude list makes the interface filter EXCLUDE, with its * filter list equal to (fbld_ex - fbld_in). */ if (fbld.fbld_ex_cnt == 0) { *fmode = MODE_IS_INCLUDE; l_copy(&fbld.fbld_in, flist); } else { *fmode = MODE_IS_EXCLUDE; l_difference(&fbld.fbld_ex, &fbld.fbld_in, flist); } } /* * Caller must hold ill_mcast_lock */ static int ilm_update_add(ilm_t *ilm, ilg_stat_t ilgstat, slist_t *ilg_flist) { mcast_record_t fmode; slist_t *flist; boolean_t fdefault; char buf[INET6_ADDRSTRLEN]; ill_t *ill = ilm->ilm_ill; /* * There are several cases where the ilm's filter state * defaults to (EXCLUDE, NULL): * - we've had previous joins without associated ilgs * - this join has no associated ilg * - the ilg's filter state is (EXCLUDE, NULL) */ fdefault = (ilm->ilm_no_ilg_cnt > 0) || (ilgstat == ILGSTAT_NONE) || SLIST_IS_EMPTY(ilg_flist); /* attempt mallocs (if needed) before doing anything else */ if ((flist = l_alloc()) == NULL) return (ENOMEM); if (!fdefault && ilm->ilm_filter == NULL) { ilm->ilm_filter = l_alloc(); if (ilm->ilm_filter == NULL) { l_free(flist); return (ENOMEM); } } if (ilgstat != ILGSTAT_CHANGE) ilm->ilm_refcnt++; if (ilgstat == ILGSTAT_NONE) ilm->ilm_no_ilg_cnt++; /* * Determine new filter state. If it's not the default * (EXCLUDE, NULL), we must walk the conn list to find * any ilgs interested in this group, and re-build the * ilm filter. */ if (fdefault) { fmode = MODE_IS_EXCLUDE; flist->sl_numsrc = 0; } else { ilm_gen_filter(ilm, &fmode, flist); } /* make sure state actually changed; nothing to do if not. */ if ((ilm->ilm_fmode == fmode) && !lists_are_different(ilm->ilm_filter, flist)) { l_free(flist); return (0); } /* send the state change report */ if (!IS_LOOPBACK(ill)) { if (ill->ill_isv6) mld_statechange(ilm, fmode, flist); else igmp_statechange(ilm, fmode, flist); } /* update the ilm state */ ilm->ilm_fmode = fmode; if (flist->sl_numsrc > 0) l_copy(flist, ilm->ilm_filter); else CLEAR_SLIST(ilm->ilm_filter); ip1dbg(("ilm_update: new if filter mode %d, group %s\n", ilm->ilm_fmode, inet_ntop(AF_INET6, &ilm->ilm_v6addr, buf, sizeof (buf)))); l_free(flist); return (0); } /* * Caller must hold ill_mcast_lock */ static int ilm_update_del(ilm_t *ilm) { mcast_record_t fmode; slist_t *flist; ill_t *ill = ilm->ilm_ill; ip1dbg(("ilm_update_del: still %d left; updating state\n", ilm->ilm_refcnt)); if ((flist = l_alloc()) == NULL) return (ENOMEM); /* * If present, the ilg in question has already either been * updated or removed from our list; so all we need to do * now is walk the list to update the ilm filter state. * * Skip the list walk if we have any no-ilg joins, which * cause the filter state to revert to (EXCLUDE, NULL). */ if (ilm->ilm_no_ilg_cnt != 0) { fmode = MODE_IS_EXCLUDE; flist->sl_numsrc = 0; } else { ilm_gen_filter(ilm, &fmode, flist); } /* check to see if state needs to be updated */ if ((ilm->ilm_fmode == fmode) && (!lists_are_different(ilm->ilm_filter, flist))) { l_free(flist); return (0); } if (!IS_LOOPBACK(ill)) { if (ill->ill_isv6) mld_statechange(ilm, fmode, flist); else igmp_statechange(ilm, fmode, flist); } ilm->ilm_fmode = fmode; if (flist->sl_numsrc > 0) { if (ilm->ilm_filter == NULL) { ilm->ilm_filter = l_alloc(); if (ilm->ilm_filter == NULL) { char buf[INET6_ADDRSTRLEN]; ip1dbg(("ilm_update_del: failed to alloc ilm " "filter; no source filtering for %s on %s", inet_ntop(AF_INET6, &ilm->ilm_v6addr, buf, sizeof (buf)), ill->ill_name)); ilm->ilm_fmode = MODE_IS_EXCLUDE; l_free(flist); return (0); } } l_copy(flist, ilm->ilm_filter); } else { CLEAR_SLIST(ilm->ilm_filter); } l_free(flist); return (0); } /* * Create/update the ilm for the group/ill. Used by other parts of IP to * do the ILGSTAT_NONE (no ilg), MODE_IS_EXCLUDE, with no slist join. * Returns with a refhold on the ilm. * * The unspecified address means all multicast addresses for in both the * case of IPv4 and IPv6. * * The caller should have already mapped an IPMP under ill to the upper. */ ilm_t * ip_addmulti(const in6_addr_t *v6group, ill_t *ill, zoneid_t zoneid, int *errorp) { ilm_t *ilm; /* Acquire serializer to keep assert in ilm_bld_flists happy */ mutex_enter(&ill->ill_mcast_serializer); ilm = ip_addmulti_serial(v6group, ill, zoneid, ILGSTAT_NONE, MODE_IS_EXCLUDE, NULL, errorp); mutex_exit(&ill->ill_mcast_serializer); return (ilm); } /* * Create/update the ilm for the group/ill. If ILGSTAT_CHANGE is not set * then this returns with a refhold on the ilm. * * Internal routine which assumes the caller has already acquired * ill_multi_serializer. * * The unspecified address means all multicast addresses for in both the * case of IPv4 and IPv6. * * ilgstat tells us if there's an ilg associated with this join, * and if so, if it's a new ilg or a change to an existing one. * ilg_fmode and ilg_flist give us the current filter state of * the ilg (and will be EXCLUDE {NULL} in the case of no ilg). * * The caller should have already mapped an IPMP under ill to the upper. */ static ilm_t * ip_addmulti_serial(const in6_addr_t *v6group, ill_t *ill, zoneid_t zoneid, ilg_stat_t ilgstat, mcast_record_t ilg_fmode, slist_t *ilg_flist, int *errorp) { ilm_t *ilm; ASSERT(MUTEX_HELD(&ill->ill_mcast_serializer)); if (ill->ill_isv6) { if (!IN6_IS_ADDR_MULTICAST(v6group) && !IN6_IS_ADDR_UNSPECIFIED(v6group)) { *errorp = EINVAL; return (NULL); } } else { if (IN6_IS_ADDR_V4MAPPED(v6group)) { ipaddr_t v4group; IN6_V4MAPPED_TO_IPADDR(v6group, v4group); if (!CLASSD(v4group)) { *errorp = EINVAL; return (NULL); } } else if (!IN6_IS_ADDR_UNSPECIFIED(v6group)) { *errorp = EINVAL; return (NULL); } } if (IS_UNDER_IPMP(ill)) { *errorp = EINVAL; return (NULL); } rw_enter(&ill->ill_mcast_lock, RW_WRITER); /* * We do the equivalent of a lookup by checking after we get the lock * This is needed since the ill could have been condemned after * we looked it up, and we need to check condemned after we hold * ill_mcast_lock to synchronize with the unplumb code. */ if (ill->ill_state_flags & ILL_CONDEMNED) { rw_exit(&ill->ill_mcast_lock); *errorp = ENXIO; return (NULL); } ilm = ip_addmulti_impl(v6group, ill, zoneid, ilgstat, ilg_fmode, ilg_flist, errorp); rw_exit(&ill->ill_mcast_lock); /* Send any deferred/queued DLPI or IP packets */ ill_mcast_send_queued(ill); ill_dlpi_send_queued(ill); ill_mcast_timer_start(ill->ill_ipst); return (ilm); } static ilm_t * ip_addmulti_impl(const in6_addr_t *v6group, ill_t *ill, zoneid_t zoneid, ilg_stat_t ilgstat, mcast_record_t ilg_fmode, slist_t *ilg_flist, int *errorp) { ilm_t *ilm; int ret = 0; ASSERT(RW_WRITE_HELD(&ill->ill_mcast_lock)); *errorp = 0; /* * An ilm is uniquely identified by the tuple of (group, ill) where * `group' is the multicast group address, and `ill' is the interface * on which it is currently joined. */ ilm = ilm_lookup(ill, v6group, zoneid); if (ilm != NULL) { /* ilm_update_add bumps ilm_refcnt unless ILGSTAT_CHANGE */ ret = ilm_update_add(ilm, ilgstat, ilg_flist); if (ret == 0) return (ilm); *errorp = ret; return (NULL); } /* * The callers checks on the ilg and the ilg+ilm consistency under * ill_mcast_serializer ensures that we can not have ILGSTAT_CHANGE * and no ilm. */ ASSERT(ilgstat != ILGSTAT_CHANGE); ilm = ilm_add(ill, v6group, ilgstat, ilg_fmode, ilg_flist, zoneid); if (ilm == NULL) { *errorp = ENOMEM; return (NULL); } if (IN6_IS_ADDR_UNSPECIFIED(v6group)) { /* * If we have more then one we should not tell the driver * to join this time. */ if (ilm_numentries(ill, v6group) == 1) { ret = ill_join_allmulti(ill); } } else { if (!IS_LOOPBACK(ill)) { if (ill->ill_isv6) mld_joingroup(ilm); else igmp_joingroup(ilm); } /* * If we have more then one we should not tell the driver * to join this time. */ if (ilm_numentries(ill, v6group) == 1) { ret = ip_ll_multireq(ill, v6group, DL_ENABMULTI_REQ); } } if (ret != 0) { if (ret == ENETDOWN) { char buf[INET6_ADDRSTRLEN]; ip0dbg(("ip_addmulti: ENETDOWN for %s on %s", inet_ntop(AF_INET6, &ilm->ilm_v6addr, buf, sizeof (buf)), ill->ill_name)); } ilm_delete(ilm); *errorp = ret; return (NULL); } else { return (ilm); } } /* * Send a multicast request to the driver for enabling or disabling * multicast reception for v6groupp address. The caller has already * checked whether it is appropriate to send one or not. * * For IPMP we switch to the cast_ill since it has the right hardware * information. */ static int ip_ll_send_multireq(ill_t *ill, const in6_addr_t *v6groupp, t_uscalar_t prim) { mblk_t *mp; uint32_t addrlen, addroff; ill_t *release_ill = NULL; int err = 0; ASSERT(RW_LOCK_HELD(&ill->ill_mcast_lock)); if (IS_IPMP(ill)) { /* On the upper IPMP ill. */ release_ill = ipmp_illgrp_hold_cast_ill(ill->ill_grp); if (release_ill == NULL) { /* * Avoid sending it down to the ipmpstub. * We will be called again once the members of the * group are in place */ ip1dbg(("ip_ll_send_multireq: no cast_ill for %s %d\n", ill->ill_name, ill->ill_isv6)); return (0); } ill = release_ill; } /* Create a DL_ENABMULTI_REQ or DL_DISABMULTI_REQ message. */ mp = ill_create_dl(ill, prim, &addrlen, &addroff); if (mp == NULL) { err = ENOMEM; goto done; } mp = ndp_mcastreq(ill, v6groupp, addrlen, addroff, mp); if (mp == NULL) { ip0dbg(("null from ndp_mcastreq(ill %s)\n", ill->ill_name)); err = ENOMEM; goto done; } switch (((union DL_primitives *)mp->b_rptr)->dl_primitive) { case DL_ENABMULTI_REQ: mutex_enter(&ill->ill_lock); /* Track the state if this is the first enabmulti */ if (ill->ill_dlpi_multicast_state == IDS_UNKNOWN) ill->ill_dlpi_multicast_state = IDS_INPROGRESS; mutex_exit(&ill->ill_lock); break; } ill_dlpi_queue(ill, mp); done: if (release_ill != NULL) ill_refrele(release_ill); return (err); } /* * Send a multicast request to the driver for enabling multicast * membership for v6group if appropriate. */ static int ip_ll_multireq(ill_t *ill, const in6_addr_t *v6groupp, t_uscalar_t prim) { if (ill->ill_net_type != IRE_IF_RESOLVER || ill->ill_ipif->ipif_flags & IPIF_POINTOPOINT) { ip1dbg(("ip_ll_multireq: not resolver\n")); return (0); /* Must be IRE_IF_NORESOLVER */ } if (ill->ill_phyint->phyint_flags & PHYI_MULTI_BCAST) { ip1dbg(("ip_ll_multireq: MULTI_BCAST\n")); return (0); } return (ip_ll_send_multireq(ill, v6groupp, prim)); } /* * Delete the ilm. Used by other parts of IP for the case of no_ilg/leaving * being true. */ int ip_delmulti(ilm_t *ilm) { ill_t *ill = ilm->ilm_ill; int error; /* Acquire serializer to keep assert in ilm_bld_flists happy */ mutex_enter(&ill->ill_mcast_serializer); error = ip_delmulti_serial(ilm, B_TRUE, B_TRUE); mutex_exit(&ill->ill_mcast_serializer); return (error); } /* * Delete the ilm. * Assumes ill_multi_serializer is held by the caller. */ static int ip_delmulti_serial(ilm_t *ilm, boolean_t no_ilg, boolean_t leaving) { ill_t *ill = ilm->ilm_ill; int ret; ASSERT(MUTEX_HELD(&ill->ill_mcast_serializer)); ASSERT(!(IS_UNDER_IPMP(ill))); rw_enter(&ill->ill_mcast_lock, RW_WRITER); ret = ip_delmulti_impl(ilm, no_ilg, leaving); rw_exit(&ill->ill_mcast_lock); /* Send any deferred/queued DLPI or IP packets */ ill_mcast_send_queued(ill); ill_dlpi_send_queued(ill); ill_mcast_timer_start(ill->ill_ipst); return (ret); } static int ip_delmulti_impl(ilm_t *ilm, boolean_t no_ilg, boolean_t leaving) { ill_t *ill = ilm->ilm_ill; int error; in6_addr_t v6group; ASSERT(RW_WRITE_HELD(&ill->ill_mcast_lock)); /* Update counters */ if (no_ilg) ilm->ilm_no_ilg_cnt--; if (leaving) ilm->ilm_refcnt--; if (ilm->ilm_refcnt > 0) return (ilm_update_del(ilm)); v6group = ilm->ilm_v6addr; if (IN6_IS_ADDR_UNSPECIFIED(&ilm->ilm_v6addr)) { ilm_delete(ilm); /* * If we have some left then one we should not tell the driver * to leave. */ if (ilm_numentries(ill, &v6group) != 0) return (0); ill_leave_allmulti(ill); return (0); } if (!IS_LOOPBACK(ill)) { if (ill->ill_isv6) mld_leavegroup(ilm); else igmp_leavegroup(ilm); } ilm_delete(ilm); /* * If we have some left then one we should not tell the driver * to leave. */ if (ilm_numentries(ill, &v6group) != 0) return (0); error = ip_ll_multireq(ill, &v6group, DL_DISABMULTI_REQ); /* We ignore the case when ill_dl_up is not set */ if (error == ENETDOWN) { char buf[INET6_ADDRSTRLEN]; ip0dbg(("ip_delmulti: ENETDOWN for %s on %s", inet_ntop(AF_INET6, &v6group, buf, sizeof (buf)), ill->ill_name)); } return (error); } /* * Make the driver pass up all multicast packets. */ int ill_join_allmulti(ill_t *ill) { mblk_t *promiscon_mp, *promiscoff_mp = NULL; uint32_t addrlen, addroff; ill_t *release_ill = NULL; ASSERT(RW_WRITE_HELD(&ill->ill_mcast_lock)); if (IS_LOOPBACK(ill)) return (0); if (!ill->ill_dl_up) { /* * Nobody there. All multicast addresses will be re-joined * when we get the DL_BIND_ACK bringing the interface up. */ return (ENETDOWN); } if (IS_IPMP(ill)) { /* On the upper IPMP ill. */ release_ill = ipmp_illgrp_hold_cast_ill(ill->ill_grp); if (release_ill == NULL) { /* * Avoid sending it down to the ipmpstub. * We will be called again once the members of the * group are in place */ ip1dbg(("ill_join_allmulti: no cast_ill for %s %d\n", ill->ill_name, ill->ill_isv6)); return (0); } ill = release_ill; if (!ill->ill_dl_up) { ill_refrele(ill); return (ENETDOWN); } } /* * Create a DL_PROMISCON_REQ message and send it directly to the DLPI * provider. We don't need to do this for certain media types for * which we never need to turn promiscuous mode on. While we're here, * pre-allocate a DL_PROMISCOFF_REQ message to make sure that * ill_leave_allmulti() will not fail due to low memory conditions. */ if ((ill->ill_net_type == IRE_IF_RESOLVER) && !(ill->ill_phyint->phyint_flags & PHYI_MULTI_BCAST)) { promiscon_mp = ill_create_dl(ill, DL_PROMISCON_REQ, &addrlen, &addroff); if (ill->ill_promiscoff_mp == NULL) promiscoff_mp = ill_create_dl(ill, DL_PROMISCOFF_REQ, &addrlen, &addroff); if (promiscon_mp == NULL || (ill->ill_promiscoff_mp == NULL && promiscoff_mp == NULL)) { freemsg(promiscon_mp); freemsg(promiscoff_mp); if (release_ill != NULL) ill_refrele(release_ill); return (ENOMEM); } if (ill->ill_promiscoff_mp == NULL) ill->ill_promiscoff_mp = promiscoff_mp; ill_dlpi_queue(ill, promiscon_mp); } if (release_ill != NULL) ill_refrele(release_ill); return (0); } /* * Make the driver stop passing up all multicast packets */ void ill_leave_allmulti(ill_t *ill) { mblk_t *promiscoff_mp; ill_t *release_ill = NULL; ASSERT(RW_WRITE_HELD(&ill->ill_mcast_lock)); if (IS_LOOPBACK(ill)) return; if (!ill->ill_dl_up) { /* * Nobody there. All multicast addresses will be re-joined * when we get the DL_BIND_ACK bringing the interface up. */ return; } if (IS_IPMP(ill)) { /* On the upper IPMP ill. */ release_ill = ipmp_illgrp_hold_cast_ill(ill->ill_grp); if (release_ill == NULL) { /* * Avoid sending it down to the ipmpstub. * We will be called again once the members of the * group are in place */ ip1dbg(("ill_leave_allmulti: no cast_ill on %s %d\n", ill->ill_name, ill->ill_isv6)); return; } ill = release_ill; if (!ill->ill_dl_up) goto done; } /* * In the case of IPMP and ill_dl_up not being set when we joined * we didn't allocate a promiscoff_mp. In that case we have * nothing to do when we leave. * Ditto for PHYI_MULTI_BCAST */ promiscoff_mp = ill->ill_promiscoff_mp; if (promiscoff_mp != NULL) { ill->ill_promiscoff_mp = NULL; ill_dlpi_queue(ill, promiscoff_mp); } done: if (release_ill != NULL) ill_refrele(release_ill); } int ip_join_allmulti(uint_t ifindex, boolean_t isv6, ip_stack_t *ipst) { ill_t *ill; int ret; ilm_t *ilm; ill = ill_lookup_on_ifindex(ifindex, isv6, ipst); if (ill == NULL) return (ENODEV); /* * The ip_addmulti() function doesn't allow IPMP underlying interfaces * to join allmulti since only the nominated underlying interface in * the group should receive multicast. We silently succeed to avoid * having to teach IPobs (currently the only caller of this routine) * to ignore failures in this case. */ if (IS_UNDER_IPMP(ill)) { ill_refrele(ill); return (0); } mutex_enter(&ill->ill_lock); if (ill->ill_ipallmulti_cnt > 0) { /* Already joined */ ASSERT(ill->ill_ipallmulti_ilm != NULL); ill->ill_ipallmulti_cnt++; mutex_exit(&ill->ill_lock); goto done; } mutex_exit(&ill->ill_lock); ilm = ip_addmulti(&ipv6_all_zeros, ill, ill->ill_zoneid, &ret); if (ilm == NULL) { ASSERT(ret != 0); ill_refrele(ill); return (ret); } mutex_enter(&ill->ill_lock); if (ill->ill_ipallmulti_cnt > 0) { /* Another thread added it concurrently */ (void) ip_delmulti(ilm); mutex_exit(&ill->ill_lock); goto done; } ASSERT(ill->ill_ipallmulti_ilm == NULL); ill->ill_ipallmulti_ilm = ilm; ill->ill_ipallmulti_cnt++; mutex_exit(&ill->ill_lock); done: ill_refrele(ill); return (0); } int ip_leave_allmulti(uint_t ifindex, boolean_t isv6, ip_stack_t *ipst) { ill_t *ill; ilm_t *ilm; ill = ill_lookup_on_ifindex(ifindex, isv6, ipst); if (ill == NULL) return (ENODEV); if (IS_UNDER_IPMP(ill)) { ill_refrele(ill); return (0); } mutex_enter(&ill->ill_lock); if (ill->ill_ipallmulti_cnt == 0) { /* ip_purge_allmulti could have removed them all */ mutex_exit(&ill->ill_lock); goto done; } ill->ill_ipallmulti_cnt--; if (ill->ill_ipallmulti_cnt == 0) { /* Last one */ ilm = ill->ill_ipallmulti_ilm; ill->ill_ipallmulti_ilm = NULL; } else { ilm = NULL; } mutex_exit(&ill->ill_lock); if (ilm != NULL) (void) ip_delmulti(ilm); done: ill_refrele(ill); return (0); } /* * Delete the allmulti memberships that were added as part of * ip_join_allmulti(). */ void ip_purge_allmulti(ill_t *ill) { ilm_t *ilm; ASSERT(IAM_WRITER_ILL(ill)); mutex_enter(&ill->ill_lock); ilm = ill->ill_ipallmulti_ilm; ill->ill_ipallmulti_ilm = NULL; ill->ill_ipallmulti_cnt = 0; mutex_exit(&ill->ill_lock); if (ilm != NULL) (void) ip_delmulti(ilm); } /* * Create a dlpi message with room for phys+sap. Later * we will strip the sap for those primitives which * only need a physical address. */ static mblk_t * ill_create_dl(ill_t *ill, uint32_t dl_primitive, uint32_t *addr_lenp, uint32_t *addr_offp) { mblk_t *mp; uint32_t hw_addr_length; char *cp; uint32_t offset; uint32_t length; uint32_t size; *addr_lenp = *addr_offp = 0; hw_addr_length = ill->ill_phys_addr_length; if (!hw_addr_length) { ip0dbg(("ip_create_dl: hw addr length = 0\n")); return (NULL); } switch (dl_primitive) { case DL_ENABMULTI_REQ: length = sizeof (dl_enabmulti_req_t); size = length + hw_addr_length; break; case DL_DISABMULTI_REQ: length = sizeof (dl_disabmulti_req_t); size = length + hw_addr_length; break; case DL_PROMISCON_REQ: case DL_PROMISCOFF_REQ: size = length = sizeof (dl_promiscon_req_t); break; default: return (NULL); } mp = allocb(size, BPRI_HI); if (!mp) return (NULL); mp->b_wptr += size; mp->b_datap->db_type = M_PROTO; cp = (char *)mp->b_rptr; offset = length; switch (dl_primitive) { case DL_ENABMULTI_REQ: { dl_enabmulti_req_t *dl = (dl_enabmulti_req_t *)cp; dl->dl_primitive = dl_primitive; dl->dl_addr_offset = offset; *addr_lenp = dl->dl_addr_length = hw_addr_length; *addr_offp = offset; break; } case DL_DISABMULTI_REQ: { dl_disabmulti_req_t *dl = (dl_disabmulti_req_t *)cp; dl->dl_primitive = dl_primitive; dl->dl_addr_offset = offset; *addr_lenp = dl->dl_addr_length = hw_addr_length; *addr_offp = offset; break; } case DL_PROMISCON_REQ: case DL_PROMISCOFF_REQ: { dl_promiscon_req_t *dl = (dl_promiscon_req_t *)cp; dl->dl_primitive = dl_primitive; dl->dl_level = DL_PROMISC_MULTI; break; } } ip1dbg(("ill_create_dl: addr_len %d, addr_off %d\n", *addr_lenp, *addr_offp)); return (mp); } /* * Rejoin any groups for which we have ilms. * * This is only needed for IPMP when the cast_ill changes since that * change is invisible to the ilm. Other interface changes are handled * by conn_update_ill. */ void ill_recover_multicast(ill_t *ill) { ilm_t *ilm; char addrbuf[INET6_ADDRSTRLEN]; ill->ill_need_recover_multicast = 0; rw_enter(&ill->ill_mcast_lock, RW_WRITER); for (ilm = ill->ill_ilm; ilm; ilm = ilm->ilm_next) { /* * If we have more then one ilm for the group (e.g., with * different zoneid) then we should not tell the driver * to join unless this is the first ilm for the group. */ if (ilm_numentries(ill, &ilm->ilm_v6addr) > 1 && ilm_lookup(ill, &ilm->ilm_v6addr, ALL_ZONES) != ilm) { continue; } ip1dbg(("ill_recover_multicast: %s\n", inet_ntop(AF_INET6, &ilm->ilm_v6addr, addrbuf, sizeof (addrbuf)))); if (IN6_IS_ADDR_UNSPECIFIED(&ilm->ilm_v6addr)) { (void) ill_join_allmulti(ill); } else { if (ill->ill_isv6) mld_joingroup(ilm); else igmp_joingroup(ilm); (void) ip_ll_multireq(ill, &ilm->ilm_v6addr, DL_ENABMULTI_REQ); } } rw_exit(&ill->ill_mcast_lock); /* Send any deferred/queued DLPI or IP packets */ ill_mcast_send_queued(ill); ill_dlpi_send_queued(ill); ill_mcast_timer_start(ill->ill_ipst); } /* * The opposite of ill_recover_multicast() -- leaves all multicast groups * that were explicitly joined. * * This is only needed for IPMP when the cast_ill changes since that * change is invisible to the ilm. Other interface changes are handled * by conn_update_ill. */ void ill_leave_multicast(ill_t *ill) { ilm_t *ilm; char addrbuf[INET6_ADDRSTRLEN]; ill->ill_need_recover_multicast = 1; rw_enter(&ill->ill_mcast_lock, RW_WRITER); for (ilm = ill->ill_ilm; ilm; ilm = ilm->ilm_next) { /* * If we have more then one ilm for the group (e.g., with * different zoneid) then we should not tell the driver * to leave unless this is the first ilm for the group. */ if (ilm_numentries(ill, &ilm->ilm_v6addr) > 1 && ilm_lookup(ill, &ilm->ilm_v6addr, ALL_ZONES) != ilm) { continue; } ip1dbg(("ill_leave_multicast: %s\n", inet_ntop(AF_INET6, &ilm->ilm_v6addr, addrbuf, sizeof (addrbuf)))); if (IN6_IS_ADDR_UNSPECIFIED(&ilm->ilm_v6addr)) { ill_leave_allmulti(ill); } else { if (ill->ill_isv6) mld_leavegroup(ilm); else igmp_leavegroup(ilm); (void) ip_ll_multireq(ill, &ilm->ilm_v6addr, DL_DISABMULTI_REQ); } } rw_exit(&ill->ill_mcast_lock); /* Send any deferred/queued DLPI or IP packets */ ill_mcast_send_queued(ill); ill_dlpi_send_queued(ill); ill_mcast_timer_start(ill->ill_ipst); } /* * Interface used by IP input/output. * Returns true if there is a member on the ill for any zoneid. */ boolean_t ill_hasmembers_v6(ill_t *ill, const in6_addr_t *v6group) { ilm_t *ilm; rw_enter(&ill->ill_mcast_lock, RW_READER); ilm = ilm_lookup(ill, v6group, ALL_ZONES); rw_exit(&ill->ill_mcast_lock); return (ilm != NULL); } /* * Interface used by IP input/output. * Returns true if there is a member on the ill for any zoneid. * * The group and source can't be INADDR_ANY here so no need to translate to * the unspecified IPv6 address. */ boolean_t ill_hasmembers_v4(ill_t *ill, ipaddr_t group) { in6_addr_t v6group; IN6_IPADDR_TO_V4MAPPED(group, &v6group); return (ill_hasmembers_v6(ill, &v6group)); } /* * Interface used by IP input/output. * Returns true if there is a member on the ill for any zoneid except skipzone. */ boolean_t ill_hasmembers_otherzones_v6(ill_t *ill, const in6_addr_t *v6group, zoneid_t skipzone) { ilm_t *ilm; rw_enter(&ill->ill_mcast_lock, RW_READER); for (ilm = ill->ill_ilm; ilm; ilm = ilm->ilm_next) { if (IN6_ARE_ADDR_EQUAL(&ilm->ilm_v6addr, v6group) && ilm->ilm_zoneid != skipzone) { rw_exit(&ill->ill_mcast_lock); return (B_TRUE); } } rw_exit(&ill->ill_mcast_lock); return (B_FALSE); } /* * Interface used by IP input/output. * Returns true if there is a member on the ill for any zoneid except skipzone. * * The group and source can't be INADDR_ANY here so no need to translate to * the unspecified IPv6 address. */ boolean_t ill_hasmembers_otherzones_v4(ill_t *ill, ipaddr_t group, zoneid_t skipzone) { in6_addr_t v6group; IN6_IPADDR_TO_V4MAPPED(group, &v6group); return (ill_hasmembers_otherzones_v6(ill, &v6group, skipzone)); } /* * Interface used by IP input. * Returns the next numerically larger zoneid that has a member. If none exist * then returns -1 (ALL_ZONES). * The normal usage is for the caller to start with a -1 zoneid (ALL_ZONES) * to find the first zoneid which has a member, and then pass that in for * subsequent calls until ALL_ZONES is returned. * * The implementation of ill_hasmembers_nextzone() assumes the ilms * are sorted by zoneid for efficiency. */ zoneid_t ill_hasmembers_nextzone_v6(ill_t *ill, const in6_addr_t *v6group, zoneid_t zoneid) { ilm_t *ilm; rw_enter(&ill->ill_mcast_lock, RW_READER); for (ilm = ill->ill_ilm; ilm; ilm = ilm->ilm_next) { if (IN6_ARE_ADDR_EQUAL(&ilm->ilm_v6addr, v6group) && ilm->ilm_zoneid > zoneid) { zoneid = ilm->ilm_zoneid; rw_exit(&ill->ill_mcast_lock); return (zoneid); } } rw_exit(&ill->ill_mcast_lock); return (ALL_ZONES); } /* * Interface used by IP input. * Returns the next numerically larger zoneid that has a member. If none exist * then returns -1 (ALL_ZONES). * * The group and source can't be INADDR_ANY here so no need to translate to * the unspecified IPv6 address. */ zoneid_t ill_hasmembers_nextzone_v4(ill_t *ill, ipaddr_t group, zoneid_t zoneid) { in6_addr_t v6group; IN6_IPADDR_TO_V4MAPPED(group, &v6group); return (ill_hasmembers_nextzone_v6(ill, &v6group, zoneid)); } /* * Find an ilm matching the ill, group, and zoneid. */ static ilm_t * ilm_lookup(ill_t *ill, const in6_addr_t *v6group, zoneid_t zoneid) { ilm_t *ilm; ASSERT(RW_LOCK_HELD(&ill->ill_mcast_lock)); for (ilm = ill->ill_ilm; ilm; ilm = ilm->ilm_next) { if (!IN6_ARE_ADDR_EQUAL(&ilm->ilm_v6addr, v6group)) continue; if (zoneid != ALL_ZONES && zoneid != ilm->ilm_zoneid) continue; ASSERT(ilm->ilm_ill == ill); return (ilm); } return (NULL); } /* * How many members on this ill? * Since each shared-IP zone has a separate ilm for the same group/ill * we can have several. */ static int ilm_numentries(ill_t *ill, const in6_addr_t *v6group) { ilm_t *ilm; int i = 0; ASSERT(RW_LOCK_HELD(&ill->ill_mcast_lock)); for (ilm = ill->ill_ilm; ilm; ilm = ilm->ilm_next) { if (IN6_ARE_ADDR_EQUAL(&ilm->ilm_v6addr, v6group)) { i++; } } return (i); } /* Caller guarantees that the group is not already on the list */ static ilm_t * ilm_add(ill_t *ill, const in6_addr_t *v6group, ilg_stat_t ilgstat, mcast_record_t ilg_fmode, slist_t *ilg_flist, zoneid_t zoneid) { ilm_t *ilm; ilm_t *ilm_cur; ilm_t **ilm_ptpn; ASSERT(RW_WRITE_HELD(&ill->ill_mcast_lock)); ilm = GETSTRUCT(ilm_t, 1); if (ilm == NULL) return (NULL); if (ilgstat != ILGSTAT_NONE && !SLIST_IS_EMPTY(ilg_flist)) { ilm->ilm_filter = l_alloc(); if (ilm->ilm_filter == NULL) { mi_free(ilm); return (NULL); } } ilm->ilm_v6addr = *v6group; ilm->ilm_refcnt = 1; ilm->ilm_zoneid = zoneid; ilm->ilm_timer = INFINITY; ilm->ilm_rtx.rtx_timer = INFINITY; ilm->ilm_ill = ill; DTRACE_PROBE3(ill__incr__cnt, (ill_t *), ill, (char *), "ilm", (void *), ilm); ill->ill_ilm_cnt++; ASSERT(ill->ill_ipst); ilm->ilm_ipst = ill->ill_ipst; /* No netstack_hold */ /* The ill/ipif could have just been marked as condemned */ /* * To make ill_hasmembers_nextzone_v6 work we keep the list * sorted by zoneid. */ ilm_cur = ill->ill_ilm; ilm_ptpn = &ill->ill_ilm; while (ilm_cur != NULL && ilm_cur->ilm_zoneid < ilm->ilm_zoneid) { ilm_ptpn = &ilm_cur->ilm_next; ilm_cur = ilm_cur->ilm_next; } ilm->ilm_next = ilm_cur; *ilm_ptpn = ilm; /* * If we have an associated ilg, use its filter state; if not, * default to (EXCLUDE, NULL) and set no_ilg_cnt to track this. */ if (ilgstat != ILGSTAT_NONE) { if (!SLIST_IS_EMPTY(ilg_flist)) l_copy(ilg_flist, ilm->ilm_filter); ilm->ilm_fmode = ilg_fmode; } else { ilm->ilm_no_ilg_cnt = 1; ilm->ilm_fmode = MODE_IS_EXCLUDE; } return (ilm); } void ilm_inactive(ilm_t *ilm) { FREE_SLIST(ilm->ilm_filter); FREE_SLIST(ilm->ilm_pendsrcs); FREE_SLIST(ilm->ilm_rtx.rtx_allow); FREE_SLIST(ilm->ilm_rtx.rtx_block); ilm->ilm_ipst = NULL; mi_free((char *)ilm); } /* * Unlink ilm and free it. */ static void ilm_delete(ilm_t *ilm) { ill_t *ill = ilm->ilm_ill; ilm_t **ilmp; boolean_t need_wakeup; /* * Delete under lock protection so that readers don't stumble * on bad ilm_next */ ASSERT(RW_WRITE_HELD(&ill->ill_mcast_lock)); for (ilmp = &ill->ill_ilm; *ilmp != ilm; ilmp = &(*ilmp)->ilm_next) ; *ilmp = ilm->ilm_next; mutex_enter(&ill->ill_lock); /* * if we are the last reference to the ill, we may need to wakeup any * pending FREE or unplumb operations. This is because conn_update_ill * bails if there is a ilg_delete_all in progress. */ need_wakeup = B_FALSE; DTRACE_PROBE3(ill__decr__cnt, (ill_t *), ill, (char *), "ilm", (void *), ilm); ASSERT(ill->ill_ilm_cnt > 0); ill->ill_ilm_cnt--; if (ILL_FREE_OK(ill)) need_wakeup = B_TRUE; ilm_inactive(ilm); /* frees this ilm */ if (need_wakeup) { /* drops ill lock */ ipif_ill_refrele_tail(ill); } else { mutex_exit(&ill->ill_lock); } } /* * Lookup an ill based on the group, ifindex, ifaddr, and zoneid. * Applies to both IPv4 and IPv6, although ifaddr is only used with * IPv4. * Returns an error for IS_UNDER_IPMP and VNI interfaces. * On error it sets *errorp. */ static ill_t * ill_mcast_lookup(const in6_addr_t *group, ipaddr_t ifaddr, uint_t ifindex, zoneid_t zoneid, ip_stack_t *ipst, int *errorp) { ill_t *ill; ipaddr_t v4group; if (IN6_IS_ADDR_V4MAPPED(group)) { IN6_V4MAPPED_TO_IPADDR(group, v4group); if (ifindex != 0) { ill = ill_lookup_on_ifindex_zoneid(ifindex, zoneid, B_FALSE, ipst); } else if (ifaddr != INADDR_ANY) { ipif_t *ipif; ipif = ipif_lookup_addr(ifaddr, NULL, zoneid, ipst); if (ipif == NULL) { ill = NULL; } else { ill = ipif->ipif_ill; ill_refhold(ill); ipif_refrele(ipif); } } else { ill = ill_lookup_group_v4(v4group, zoneid, ipst, NULL, NULL); } } else { if (ifindex != 0) { ill = ill_lookup_on_ifindex_zoneid(ifindex, zoneid, B_TRUE, ipst); } else { ill = ill_lookup_group_v6(group, zoneid, ipst, NULL, NULL); } } if (ill == NULL) { if (ifindex != 0) *errorp = ENXIO; else *errorp = EADDRNOTAVAIL; return (NULL); } /* operation not supported on the virtual network interface */ if (IS_UNDER_IPMP(ill) || IS_VNI(ill)) { ill_refrele(ill); *errorp = EINVAL; return (NULL); } return (ill); } /* * Looks up the appropriate ill given an interface index (or interface address) * and multicast group. On success, returns 0, with *illpp pointing to the * found struct. On failure, returns an errno and *illpp is set to NULL. * * Returns an error for IS_UNDER_IPMP and VNI interfaces. * * Handles both IPv4 and IPv6. The ifaddr argument only applies in the * case of IPv4. */ int ip_opt_check(conn_t *connp, const in6_addr_t *v6group, const in6_addr_t *v6src, ipaddr_t ifaddr, uint_t ifindex, ill_t **illpp) { boolean_t src_unspec; ill_t *ill = NULL; ip_stack_t *ipst = connp->conn_netstack->netstack_ip; int error = 0; *illpp = NULL; src_unspec = IN6_IS_ADDR_UNSPECIFIED(v6src); if (IN6_IS_ADDR_V4MAPPED(v6group)) { ipaddr_t v4group; ipaddr_t v4src; if (!IN6_IS_ADDR_V4MAPPED(v6src) && !src_unspec) return (EINVAL); IN6_V4MAPPED_TO_IPADDR(v6group, v4group); if (src_unspec) { v4src = INADDR_ANY; } else { IN6_V4MAPPED_TO_IPADDR(v6src, v4src); } if (!CLASSD(v4group) || CLASSD(v4src)) return (EINVAL); } else { if (IN6_IS_ADDR_V4MAPPED(v6src) && !src_unspec) return (EINVAL); if (!IN6_IS_ADDR_MULTICAST(v6group) || IN6_IS_ADDR_MULTICAST(v6src)) { return (EINVAL); } } ill = ill_mcast_lookup(v6group, ifaddr, ifindex, IPCL_ZONEID(connp), ipst, &error); *illpp = ill; return (error); } static int ip_get_srcfilter(conn_t *connp, struct group_filter *gf, struct ip_msfilter *imsf, const struct in6_addr *group, boolean_t issin6) { ilg_t *ilg; int i, numsrc, fmode, outsrcs; struct sockaddr_in *sin; struct sockaddr_in6 *sin6; struct in_addr *addrp; slist_t *fp; boolean_t is_v4only_api; ipaddr_t ifaddr; uint_t ifindex; if (gf == NULL) { ASSERT(imsf != NULL); ASSERT(!issin6); is_v4only_api = B_TRUE; outsrcs = imsf->imsf_numsrc; ifaddr = imsf->imsf_interface.s_addr; ifindex = 0; } else { ASSERT(imsf == NULL); is_v4only_api = B_FALSE; outsrcs = gf->gf_numsrc; ifaddr = INADDR_ANY; ifindex = gf->gf_interface; } /* No need to use ill_mcast_serializer for the reader */ rw_enter(&connp->conn_ilg_lock, RW_READER); ilg = ilg_lookup(connp, group, ifaddr, ifindex); if (ilg == NULL) { rw_exit(&connp->conn_ilg_lock); return (EADDRNOTAVAIL); } /* * In the kernel, we use the state definitions MODE_IS_[IN|EX]CLUDE * to identify the filter mode; but the API uses MCAST_[IN|EX]CLUDE. * So we need to translate here. */ fmode = (ilg->ilg_fmode == MODE_IS_INCLUDE) ? MCAST_INCLUDE : MCAST_EXCLUDE; if ((fp = ilg->ilg_filter) == NULL) { numsrc = 0; } else { for (i = 0; i < outsrcs; i++) { if (i == fp->sl_numsrc) break; if (issin6) { sin6 = (struct sockaddr_in6 *)&gf->gf_slist[i]; sin6->sin6_family = AF_INET6; sin6->sin6_addr = fp->sl_addr[i]; } else { if (is_v4only_api) { addrp = &imsf->imsf_slist[i]; } else { sin = (struct sockaddr_in *) &gf->gf_slist[i]; sin->sin_family = AF_INET; addrp = &sin->sin_addr; } IN6_V4MAPPED_TO_INADDR(&fp->sl_addr[i], addrp); } } numsrc = fp->sl_numsrc; } if (is_v4only_api) { imsf->imsf_numsrc = numsrc; imsf->imsf_fmode = fmode; } else { gf->gf_numsrc = numsrc; gf->gf_fmode = fmode; } rw_exit(&connp->conn_ilg_lock); return (0); } /* * Common for IPv4 and IPv6. */ static int ip_set_srcfilter(conn_t *connp, struct group_filter *gf, struct ip_msfilter *imsf, const struct in6_addr *group, ill_t *ill, boolean_t issin6) { ilg_t *ilg; int i, err, infmode, new_fmode; uint_t insrcs; struct sockaddr_in *sin; struct sockaddr_in6 *sin6; struct in_addr *addrp; slist_t *orig_filter = NULL; slist_t *new_filter = NULL; mcast_record_t orig_fmode; boolean_t leave_group, is_v4only_api; ilg_stat_t ilgstat; ilm_t *ilm; ipaddr_t ifaddr; uint_t ifindex; if (gf == NULL) { ASSERT(imsf != NULL); ASSERT(!issin6); is_v4only_api = B_TRUE; insrcs = imsf->imsf_numsrc; infmode = imsf->imsf_fmode; ifaddr = imsf->imsf_interface.s_addr; ifindex = 0; } else { ASSERT(imsf == NULL); is_v4only_api = B_FALSE; insrcs = gf->gf_numsrc; infmode = gf->gf_fmode; ifaddr = INADDR_ANY; ifindex = gf->gf_interface; } /* Make sure we can handle the source list */ if (insrcs > MAX_FILTER_SIZE) return (ENOBUFS); /* * setting the filter to (INCLUDE, NULL) is treated * as a request to leave the group. */ leave_group = (infmode == MCAST_INCLUDE && insrcs == 0); mutex_enter(&ill->ill_mcast_serializer); rw_enter(&connp->conn_ilg_lock, RW_WRITER); ilg = ilg_lookup(connp, group, ifaddr, ifindex); if (ilg == NULL) { /* * if the request was actually to leave, and we * didn't find an ilg, there's nothing to do. */ if (leave_group) { rw_exit(&connp->conn_ilg_lock); mutex_exit(&ill->ill_mcast_serializer); return (0); } ilg = conn_ilg_alloc(connp, &err); if (ilg == NULL) { rw_exit(&connp->conn_ilg_lock); mutex_exit(&ill->ill_mcast_serializer); return (err); } ilgstat = ILGSTAT_NEW; ilg->ilg_v6group = *group; ilg->ilg_ill = ill; ilg->ilg_ifaddr = ifaddr; ilg->ilg_ifindex = ifindex; } else if (leave_group) { /* * Make sure we have the correct serializer. The ill argument * might not match ilg_ill. */ ilg_refhold(ilg); mutex_exit(&ill->ill_mcast_serializer); ill = ilg->ilg_ill; rw_exit(&connp->conn_ilg_lock); mutex_enter(&ill->ill_mcast_serializer); rw_enter(&connp->conn_ilg_lock, RW_WRITER); ilm = ilg->ilg_ilm; ilg->ilg_ilm = NULL; ilg_delete(connp, ilg, NULL); ilg_refrele(ilg); rw_exit(&connp->conn_ilg_lock); if (ilm != NULL) (void) ip_delmulti_serial(ilm, B_FALSE, B_TRUE); mutex_exit(&ill->ill_mcast_serializer); return (0); } else { ilgstat = ILGSTAT_CHANGE; /* Preserve existing state in case ip_addmulti() fails */ orig_fmode = ilg->ilg_fmode; if (ilg->ilg_filter == NULL) { orig_filter = NULL; } else { orig_filter = l_alloc_copy(ilg->ilg_filter); if (orig_filter == NULL) { rw_exit(&connp->conn_ilg_lock); mutex_exit(&ill->ill_mcast_serializer); return (ENOMEM); } } } /* * Alloc buffer to copy new state into (see below) before * we make any changes, so we can bail if it fails. */ if ((new_filter = l_alloc()) == NULL) { rw_exit(&connp->conn_ilg_lock); err = ENOMEM; goto free_and_exit; } if (insrcs == 0) { CLEAR_SLIST(ilg->ilg_filter); } else { slist_t *fp; if (ilg->ilg_filter == NULL) { fp = l_alloc(); if (fp == NULL) { if (ilgstat == ILGSTAT_NEW) ilg_delete(connp, ilg, NULL); rw_exit(&connp->conn_ilg_lock); err = ENOMEM; goto free_and_exit; } } else { fp = ilg->ilg_filter; } for (i = 0; i < insrcs; i++) { if (issin6) { sin6 = (struct sockaddr_in6 *)&gf->gf_slist[i]; fp->sl_addr[i] = sin6->sin6_addr; } else { if (is_v4only_api) { addrp = &imsf->imsf_slist[i]; } else { sin = (struct sockaddr_in *) &gf->gf_slist[i]; addrp = &sin->sin_addr; } IN6_INADDR_TO_V4MAPPED(addrp, &fp->sl_addr[i]); } } fp->sl_numsrc = insrcs; ilg->ilg_filter = fp; } /* * In the kernel, we use the state definitions MODE_IS_[IN|EX]CLUDE * to identify the filter mode; but the API uses MCAST_[IN|EX]CLUDE. * So we need to translate here. */ ilg->ilg_fmode = (infmode == MCAST_INCLUDE) ? MODE_IS_INCLUDE : MODE_IS_EXCLUDE; /* * Save copy of ilg's filter state to pass to other functions, * so we can release conn_ilg_lock now. */ new_fmode = ilg->ilg_fmode; l_copy(ilg->ilg_filter, new_filter); rw_exit(&connp->conn_ilg_lock); /* * Now update the ill. We wait to do this until after the ilg * has been updated because we need to update the src filter * info for the ill, which involves looking at the status of * all the ilgs associated with this group/interface pair. */ ilm = ip_addmulti_serial(group, ill, connp->conn_zoneid, ilgstat, new_fmode, new_filter, &err); rw_enter(&connp->conn_ilg_lock, RW_WRITER); /* * Must look up the ilg again since we've not been holding * conn_ilg_lock. The ilg could have disappeared due to an unplumb * having called conn_update_ill, which can run once we dropped the * conn_ilg_lock above. */ ilg = ilg_lookup(connp, group, ifaddr, ifindex); if (ilg == NULL) { rw_exit(&connp->conn_ilg_lock); if (ilm != NULL) { (void) ip_delmulti_serial(ilm, B_FALSE, (ilgstat == ILGSTAT_NEW)); } err = ENXIO; goto free_and_exit; } if (ilm != NULL) { /* Succeeded. Update the ilg to point at the ilm */ if (ilgstat == ILGSTAT_NEW) { ASSERT(ilg->ilg_ilm == NULL); ilg->ilg_ilm = ilm; ilm->ilm_ifaddr = ifaddr; /* For netstat */ } else { /* * ip_addmulti didn't get a held ilm for * ILGSTAT_CHANGE; ilm_refcnt was unchanged. */ ASSERT(ilg->ilg_ilm == ilm); } } else { ASSERT(err != 0); /* * Failed to allocate the ilm. * Restore the original filter state, or delete the * newly-created ilg. * If ENETDOWN just clear ill_ilg since so that we * will rejoin when the ill comes back; don't report ENETDOWN * to application. */ if (ilgstat == ILGSTAT_NEW) { if (err == ENETDOWN) { ilg->ilg_ill = NULL; err = 0; } else { ilg_delete(connp, ilg, NULL); } } else { ilg->ilg_fmode = orig_fmode; if (SLIST_IS_EMPTY(orig_filter)) { CLEAR_SLIST(ilg->ilg_filter); } else { /* * We didn't free the filter, even if we * were trying to make the source list empty; * so if orig_filter isn't empty, the ilg * must still have a filter alloc'd. */ l_copy(orig_filter, ilg->ilg_filter); } } } rw_exit(&connp->conn_ilg_lock); free_and_exit: mutex_exit(&ill->ill_mcast_serializer); l_free(orig_filter); l_free(new_filter); return (err); } /* * Process the SIOC[GS]MSFILTER and SIOC[GS]IPMSFILTER ioctls. */ /* ARGSUSED */ int ip_sioctl_msfilter(ipif_t *ipif, sin_t *dummy_sin, queue_t *q, mblk_t *mp, ip_ioctl_cmd_t *ipip, void *ifreq) { struct iocblk *iocp = (struct iocblk *)mp->b_rptr; /* existence verified in ip_wput_nondata() */ mblk_t *data_mp = mp->b_cont->b_cont; int datalen, err, cmd, minsize; uint_t expsize = 0; conn_t *connp; boolean_t isv6, is_v4only_api, getcmd; struct sockaddr_in *gsin; struct sockaddr_in6 *gsin6; ipaddr_t v4group; in6_addr_t v6group; struct group_filter *gf = NULL; struct ip_msfilter *imsf = NULL; mblk_t *ndp; ill_t *ill; connp = Q_TO_CONN(q); err = ip_msfilter_ill(connp, mp, ipip, &ill); if (err != 0) return (err); if (data_mp->b_cont != NULL) { if ((ndp = msgpullup(data_mp, -1)) == NULL) return (ENOMEM); freemsg(data_mp); data_mp = ndp; mp->b_cont->b_cont = data_mp; } cmd = iocp->ioc_cmd; getcmd = (cmd == SIOCGIPMSFILTER || cmd == SIOCGMSFILTER); is_v4only_api = (cmd == SIOCGIPMSFILTER || cmd == SIOCSIPMSFILTER); minsize = (is_v4only_api) ? IP_MSFILTER_SIZE(0) : GROUP_FILTER_SIZE(0); datalen = MBLKL(data_mp); if (datalen < minsize) return (EINVAL); /* * now we know we have at least have the initial structure, * but need to check for the source list array. */ if (is_v4only_api) { imsf = (struct ip_msfilter *)data_mp->b_rptr; isv6 = B_FALSE; expsize = IP_MSFILTER_SIZE(imsf->imsf_numsrc); } else { gf = (struct group_filter *)data_mp->b_rptr; if (gf->gf_group.ss_family == AF_INET6) { gsin6 = (struct sockaddr_in6 *)&gf->gf_group; isv6 = !(IN6_IS_ADDR_V4MAPPED(&gsin6->sin6_addr)); } else { isv6 = B_FALSE; } expsize = GROUP_FILTER_SIZE(gf->gf_numsrc); } if (datalen < expsize) return (EINVAL); if (isv6) { gsin6 = (struct sockaddr_in6 *)&gf->gf_group; v6group = gsin6->sin6_addr; if (getcmd) { err = ip_get_srcfilter(connp, gf, NULL, &v6group, B_TRUE); } else { err = ip_set_srcfilter(connp, gf, NULL, &v6group, ill, B_TRUE); } } else { boolean_t issin6 = B_FALSE; if (is_v4only_api) { v4group = (ipaddr_t)imsf->imsf_multiaddr.s_addr; IN6_IPADDR_TO_V4MAPPED(v4group, &v6group); } else { if (gf->gf_group.ss_family == AF_INET) { gsin = (struct sockaddr_in *)&gf->gf_group; v4group = (ipaddr_t)gsin->sin_addr.s_addr; IN6_IPADDR_TO_V4MAPPED(v4group, &v6group); } else { gsin6 = (struct sockaddr_in6 *)&gf->gf_group; IN6_V4MAPPED_TO_IPADDR(&gsin6->sin6_addr, v4group); issin6 = B_TRUE; } } /* * INADDR_ANY is represented as the IPv6 unspecifed addr. */ if (v4group == INADDR_ANY) v6group = ipv6_all_zeros; else IN6_IPADDR_TO_V4MAPPED(v4group, &v6group); if (getcmd) { err = ip_get_srcfilter(connp, gf, imsf, &v6group, issin6); } else { err = ip_set_srcfilter(connp, gf, imsf, &v6group, ill, issin6); } } ill_refrele(ill); return (err); } /* * Determine the ill for the SIOC*MSFILTER ioctls * * Returns an error for IS_UNDER_IPMP interfaces. * * Finds the ill based on information in the ioctl headers. */ static int ip_msfilter_ill(conn_t *connp, mblk_t *mp, const ip_ioctl_cmd_t *ipip, ill_t **illp) { int cmd = ipip->ipi_cmd; int err = 0; ill_t *ill; /* caller has verified this mblk exists */ char *dbuf = (char *)mp->b_cont->b_cont->b_rptr; struct ip_msfilter *imsf; struct group_filter *gf; ipaddr_t v4addr, v4group; in6_addr_t v6group; uint32_t index; ip_stack_t *ipst; ipst = connp->conn_netstack->netstack_ip; *illp = NULL; /* don't allow multicast operations on a tcp conn */ if (IPCL_IS_TCP(connp)) return (ENOPROTOOPT); if (cmd == SIOCSIPMSFILTER || cmd == SIOCGIPMSFILTER) { /* don't allow v4-specific ioctls on v6 socket */ if (connp->conn_family == AF_INET6) return (EAFNOSUPPORT); imsf = (struct ip_msfilter *)dbuf; v4addr = imsf->imsf_interface.s_addr; v4group = imsf->imsf_multiaddr.s_addr; IN6_IPADDR_TO_V4MAPPED(v4group, &v6group); ill = ill_mcast_lookup(&v6group, v4addr, 0, IPCL_ZONEID(connp), ipst, &err); if (ill == NULL && v4addr != INADDR_ANY) err = ENXIO; } else { gf = (struct group_filter *)dbuf; index = gf->gf_interface; if (gf->gf_group.ss_family == AF_INET6) { struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)&gf->gf_group; v6group = sin6->sin6_addr; } else if (gf->gf_group.ss_family == AF_INET) { struct sockaddr_in *sin; sin = (struct sockaddr_in *)&gf->gf_group; v4group = sin->sin_addr.s_addr; IN6_IPADDR_TO_V4MAPPED(v4group, &v6group); } else { return (EAFNOSUPPORT); } ill = ill_mcast_lookup(&v6group, INADDR_ANY, index, IPCL_ZONEID(connp), ipst, &err); } *illp = ill; return (err); } /* * The structures used for the SIOC*MSFILTER ioctls usually must be copied * in in two stages, as the first copyin tells us the size of the attached * source buffer. This function is called by ip_wput_nondata() after the * first copyin has completed; it figures out how big the second stage * needs to be, and kicks it off. * * In some cases (numsrc < 2), the second copyin is not needed as the * first one gets a complete structure containing 1 source addr. * * The function returns 0 if a second copyin has been started (i.e. there's * no more work to be done right now), or 1 if the second copyin is not * needed and ip_wput_nondata() can continue its processing. */ int ip_copyin_msfilter(queue_t *q, mblk_t *mp) { struct iocblk *iocp = (struct iocblk *)mp->b_rptr; int cmd = iocp->ioc_cmd; /* validity of this checked in ip_wput_nondata() */ mblk_t *mp1 = mp->b_cont->b_cont; int copysize = 0; int offset; if (cmd == SIOCSMSFILTER || cmd == SIOCGMSFILTER) { struct group_filter *gf = (struct group_filter *)mp1->b_rptr; if (gf->gf_numsrc >= 2) { offset = sizeof (struct group_filter); copysize = GROUP_FILTER_SIZE(gf->gf_numsrc) - offset; } } else { struct ip_msfilter *imsf = (struct ip_msfilter *)mp1->b_rptr; if (imsf->imsf_numsrc >= 2) { offset = sizeof (struct ip_msfilter); copysize = IP_MSFILTER_SIZE(imsf->imsf_numsrc) - offset; } } if (copysize > 0) { mi_copyin_n(q, mp, offset, copysize); return (0); } return (1); } /* * Handle the following optmgmt: * IP_ADD_MEMBERSHIP must not have joined already * IPV6_JOIN_GROUP must not have joined already * MCAST_JOIN_GROUP must not have joined already * IP_BLOCK_SOURCE must have joined already * MCAST_BLOCK_SOURCE must have joined already * IP_JOIN_SOURCE_GROUP may have joined already * MCAST_JOIN_SOURCE_GROUP may have joined already * * fmode and src parameters may be used to determine which option is * being set, as follows (IPV6_JOIN_GROUP and MCAST_JOIN_GROUP options * are functionally equivalent): * opt fmode v6src * IP_ADD_MEMBERSHIP MODE_IS_EXCLUDE unspecified * IPV6_JOIN_GROUP MODE_IS_EXCLUDE unspecified * MCAST_JOIN_GROUP MODE_IS_EXCLUDE unspecified * IP_BLOCK_SOURCE MODE_IS_EXCLUDE IPv4-mapped addr * MCAST_BLOCK_SOURCE MODE_IS_EXCLUDE v6 addr * IP_JOIN_SOURCE_GROUP MODE_IS_INCLUDE IPv4-mapped addr * MCAST_JOIN_SOURCE_GROUP MODE_IS_INCLUDE v6 addr * * Changing the filter mode is not allowed; if a matching ilg already * exists and fmode != ilg->ilg_fmode, EINVAL is returned. * * Verifies that there is a source address of appropriate scope for * the group; if not, EADDRNOTAVAIL is returned. * * The interface to be used may be identified by an IPv4 address or by an * interface index. * * Handles IPv4-mapped IPv6 multicast addresses by associating them * with the IPv4 address. Assumes that if v6group is v4-mapped, * v6src is also v4-mapped. */ int ip_opt_add_group(conn_t *connp, boolean_t checkonly, const in6_addr_t *v6group, ipaddr_t ifaddr, uint_t ifindex, mcast_record_t fmode, const in6_addr_t *v6src) { ill_t *ill; char buf[INET6_ADDRSTRLEN]; int err; err = ip_opt_check(connp, v6group, v6src, ifaddr, ifindex, &ill); if (err != 0) { ip1dbg(("ip_opt_add_group: no ill for group %s/" "index %d\n", inet_ntop(AF_INET6, v6group, buf, sizeof (buf)), ifindex)); return (err); } if (checkonly) { /* * do not do operation, just pretend to - new T_CHECK * semantics. The error return case above if encountered * considered a good enough "check" here. */ ill_refrele(ill); return (0); } mutex_enter(&ill->ill_mcast_serializer); err = ilg_add(connp, v6group, ifaddr, ifindex, ill, fmode, v6src); mutex_exit(&ill->ill_mcast_serializer); ill_refrele(ill); return (err); } /* * Common for IPv6 and IPv4. * Here we handle ilgs that are still attached to their original ill * (the one ifaddr/ifindex points at), as well as detached ones. * The detached ones might have been attached to some other ill. */ static int ip_opt_delete_group_excl(conn_t *connp, const in6_addr_t *v6group, ipaddr_t ifaddr, uint_t ifindex, mcast_record_t fmode, const in6_addr_t *v6src) { ilg_t *ilg; boolean_t leaving; ilm_t *ilm; ill_t *ill; int err = 0; retry: rw_enter(&connp->conn_ilg_lock, RW_WRITER); ilg = ilg_lookup(connp, v6group, ifaddr, ifindex); if (ilg == NULL) { rw_exit(&connp->conn_ilg_lock); /* * Since we didn't have any ilg we now do the error checks * to determine the best errno. */ err = ip_opt_check(connp, v6group, v6src, ifaddr, ifindex, &ill); if (ill != NULL) { /* The only error was a missing ilg for the group */ ill_refrele(ill); err = EADDRNOTAVAIL; } return (err); } /* If the ilg is attached then we serialize using that ill */ ill = ilg->ilg_ill; if (ill != NULL) { /* Prevent the ill and ilg from being freed */ ill_refhold(ill); ilg_refhold(ilg); rw_exit(&connp->conn_ilg_lock); mutex_enter(&ill->ill_mcast_serializer); rw_enter(&connp->conn_ilg_lock, RW_WRITER); if (ilg->ilg_condemned) { /* Disappeared */ ilg_refrele(ilg); rw_exit(&connp->conn_ilg_lock); mutex_exit(&ill->ill_mcast_serializer); ill_refrele(ill); goto retry; } } /* * Decide if we're actually deleting the ilg or just removing a * source filter address; if just removing an addr, make sure we * aren't trying to change the filter mode, and that the addr is * actually in our filter list already. If we're removing the * last src in an include list, just delete the ilg. */ if (IN6_IS_ADDR_UNSPECIFIED(v6src)) { leaving = B_TRUE; } else { if (fmode != ilg->ilg_fmode) err = EINVAL; else if (ilg->ilg_filter == NULL || !list_has_addr(ilg->ilg_filter, v6src)) err = EADDRNOTAVAIL; if (err != 0) { if (ill != NULL) ilg_refrele(ilg); rw_exit(&connp->conn_ilg_lock); goto done; } if (fmode == MODE_IS_INCLUDE && ilg->ilg_filter->sl_numsrc == 1) { leaving = B_TRUE; v6src = NULL; } else { leaving = B_FALSE; } } ilm = ilg->ilg_ilm; if (leaving) ilg->ilg_ilm = NULL; ilg_delete(connp, ilg, v6src); if (ill != NULL) ilg_refrele(ilg); rw_exit(&connp->conn_ilg_lock); if (ilm != NULL) { ASSERT(ill != NULL); (void) ip_delmulti_serial(ilm, B_FALSE, leaving); } done: if (ill != NULL) { mutex_exit(&ill->ill_mcast_serializer); ill_refrele(ill); } return (err); } /* * Handle the following optmgmt: * IP_DROP_MEMBERSHIP will leave * IPV6_LEAVE_GROUP will leave * MCAST_LEAVE_GROUP will leave * IP_UNBLOCK_SOURCE will not leave * MCAST_UNBLOCK_SOURCE will not leave * IP_LEAVE_SOURCE_GROUP may leave (if leaving last source) * MCAST_LEAVE_SOURCE_GROUP may leave (if leaving last source) * * fmode and src parameters may be used to determine which option is * being set, as follows: * opt fmode v6src * IP_DROP_MEMBERSHIP MODE_IS_INCLUDE unspecified * IPV6_LEAVE_GROUP MODE_IS_INCLUDE unspecified * MCAST_LEAVE_GROUP MODE_IS_INCLUDE unspecified * IP_UNBLOCK_SOURCE MODE_IS_EXCLUDE IPv4-mapped addr * MCAST_UNBLOCK_SOURCE MODE_IS_EXCLUDE v6 addr * IP_LEAVE_SOURCE_GROUP MODE_IS_INCLUDE IPv4-mapped addr * MCAST_LEAVE_SOURCE_GROUP MODE_IS_INCLUDE v6 addr * * Changing the filter mode is not allowed; if a matching ilg already * exists and fmode != ilg->ilg_fmode, EINVAL is returned. * * The interface to be used may be identified by an IPv4 address or by an * interface index. * * Handles IPv4-mapped IPv6 multicast addresses by associating them * with the IPv4 address. Assumes that if v6group is v4-mapped, * v6src is also v4-mapped. */ int ip_opt_delete_group(conn_t *connp, boolean_t checkonly, const in6_addr_t *v6group, ipaddr_t ifaddr, uint_t ifindex, mcast_record_t fmode, const in6_addr_t *v6src) { /* * In the normal case below we don't check for the ill existing. * Instead we look for an existing ilg in _excl. * If checkonly we sanity check the arguments */ if (checkonly) { ill_t *ill; int err; err = ip_opt_check(connp, v6group, v6src, ifaddr, ifindex, &ill); /* * do not do operation, just pretend to - new T_CHECK semantics. * ip_opt_check is considered a good enough "check" here. */ if (ill != NULL) ill_refrele(ill); return (err); } return (ip_opt_delete_group_excl(connp, v6group, ifaddr, ifindex, fmode, v6src)); } /* * Group mgmt for upper conn that passes things down * to the interface multicast list (and DLPI) * These routines can handle new style options that specify an interface name * as opposed to an interface address (needed for general handling of * unnumbered interfaces.) */ /* * Add a group to an upper conn group data structure and pass things down * to the interface multicast list (and DLPI) * Common for IPv4 and IPv6; for IPv4 we can have an ifaddr. */ static int ilg_add(conn_t *connp, const in6_addr_t *v6group, ipaddr_t ifaddr, uint_t ifindex, ill_t *ill, mcast_record_t fmode, const in6_addr_t *v6src) { int error = 0; ilg_t *ilg; ilg_stat_t ilgstat; slist_t *new_filter = NULL; int new_fmode; ilm_t *ilm; if (!(ill->ill_flags & ILLF_MULTICAST)) return (EADDRNOTAVAIL); /* conn_ilg_lock protects the ilg list. */ ASSERT(MUTEX_HELD(&ill->ill_mcast_serializer)); rw_enter(&connp->conn_ilg_lock, RW_WRITER); ilg = ilg_lookup(connp, v6group, ifaddr, ifindex); /* * Depending on the option we're handling, may or may not be okay * if group has already been added. Figure out our rules based * on fmode and src params. Also make sure there's enough room * in the filter if we're adding a source to an existing filter. */ if (IN6_IS_ADDR_UNSPECIFIED(v6src)) { /* we're joining for all sources, must not have joined */ if (ilg != NULL) error = EADDRINUSE; } else { if (fmode == MODE_IS_EXCLUDE) { /* (excl {addr}) => block source, must have joined */ if (ilg == NULL) error = EADDRNOTAVAIL; } /* (incl {addr}) => join source, may have joined */ if (ilg != NULL && SLIST_CNT(ilg->ilg_filter) == MAX_FILTER_SIZE) error = ENOBUFS; } if (error != 0) { rw_exit(&connp->conn_ilg_lock); return (error); } /* * Alloc buffer to copy new state into (see below) before * we make any changes, so we can bail if it fails. */ if ((new_filter = l_alloc()) == NULL) { rw_exit(&connp->conn_ilg_lock); return (ENOMEM); } if (ilg == NULL) { if ((ilg = conn_ilg_alloc(connp, &error)) == NULL) { rw_exit(&connp->conn_ilg_lock); l_free(new_filter); return (error); } ilg->ilg_ifindex = ifindex; ilg->ilg_ifaddr = ifaddr; if (!IN6_IS_ADDR_UNSPECIFIED(v6src)) { ilg->ilg_filter = l_alloc(); if (ilg->ilg_filter == NULL) { ilg_delete(connp, ilg, NULL); rw_exit(&connp->conn_ilg_lock); l_free(new_filter); return (ENOMEM); } ilg->ilg_filter->sl_numsrc = 1; ilg->ilg_filter->sl_addr[0] = *v6src; } ilgstat = ILGSTAT_NEW; ilg->ilg_v6group = *v6group; ilg->ilg_fmode = fmode; ilg->ilg_ill = ill; } else { int index; if (ilg->ilg_fmode != fmode || IN6_IS_ADDR_UNSPECIFIED(v6src)) { rw_exit(&connp->conn_ilg_lock); l_free(new_filter); return (EINVAL); } if (ilg->ilg_filter == NULL) { ilg->ilg_filter = l_alloc(); if (ilg->ilg_filter == NULL) { rw_exit(&connp->conn_ilg_lock); l_free(new_filter); return (ENOMEM); } } if (list_has_addr(ilg->ilg_filter, v6src)) { rw_exit(&connp->conn_ilg_lock); l_free(new_filter); return (EADDRNOTAVAIL); } ilgstat = ILGSTAT_CHANGE; index = ilg->ilg_filter->sl_numsrc++; ilg->ilg_filter->sl_addr[index] = *v6src; } /* * Save copy of ilg's filter state to pass to other functions, * so we can release conn_ilg_lock now. */ new_fmode = ilg->ilg_fmode; l_copy(ilg->ilg_filter, new_filter); rw_exit(&connp->conn_ilg_lock); /* * Now update the ill. We wait to do this until after the ilg * has been updated because we need to update the src filter * info for the ill, which involves looking at the status of * all the ilgs associated with this group/interface pair. */ ilm = ip_addmulti_serial(v6group, ill, connp->conn_zoneid, ilgstat, new_fmode, new_filter, &error); rw_enter(&connp->conn_ilg_lock, RW_WRITER); /* * Must look up the ilg again since we've not been holding * conn_ilg_lock. The ilg could have disappeared due to an unplumb * having called conn_update_ill, which can run once we dropped the * conn_ilg_lock above. */ ilg = ilg_lookup(connp, v6group, ifaddr, ifindex); if (ilg == NULL) { rw_exit(&connp->conn_ilg_lock); if (ilm != NULL) { (void) ip_delmulti_serial(ilm, B_FALSE, (ilgstat == ILGSTAT_NEW)); } error = ENXIO; goto free_and_exit; } if (ilm != NULL) { /* Succeeded. Update the ilg to point at the ilm */ if (ilgstat == ILGSTAT_NEW) { ASSERT(ilg->ilg_ilm == NULL); ilg->ilg_ilm = ilm; ilm->ilm_ifaddr = ifaddr; /* For netstat */ } else { /* * ip_addmulti didn't get a held ilm for * ILGSTAT_CHANGE; ilm_refcnt was unchanged. */ ASSERT(ilg->ilg_ilm == ilm); } } else { ASSERT(error != 0); /* * Failed to allocate the ilm. * Need to undo what we did before calling ip_addmulti() * If ENETDOWN just clear ill_ilg since so that we * will rejoin when the ill comes back; don't report ENETDOWN * to application. */ if (ilgstat == ILGSTAT_NEW && error == ENETDOWN) { ilg->ilg_ill = NULL; error = 0; } else { in6_addr_t delsrc = (ilgstat == ILGSTAT_NEW) ? ipv6_all_zeros : *v6src; ilg_delete(connp, ilg, &delsrc); } } rw_exit(&connp->conn_ilg_lock); free_and_exit: l_free(new_filter); return (error); } /* * Find an IPv4 ilg matching group, ill and source. * The group and source can't be INADDR_ANY here so no need to translate to * the unspecified IPv6 address. */ boolean_t conn_hasmembers_ill_withsrc_v4(conn_t *connp, ipaddr_t group, ipaddr_t src, ill_t *ill) { in6_addr_t v6group, v6src; int i; boolean_t isinlist; ilg_t *ilg; rw_enter(&connp->conn_ilg_lock, RW_READER); IN6_IPADDR_TO_V4MAPPED(group, &v6group); for (ilg = connp->conn_ilg; ilg != NULL; ilg = ilg->ilg_next) { if (ilg->ilg_condemned) continue; /* ilg_ill could be NULL if an add is in progress */ if (ilg->ilg_ill != ill) continue; /* The callers use upper ill for IPMP */ ASSERT(!IS_UNDER_IPMP(ill)); if (IN6_ARE_ADDR_EQUAL(&ilg->ilg_v6group, &v6group)) { if (SLIST_IS_EMPTY(ilg->ilg_filter)) { /* no source filter, so this is a match */ rw_exit(&connp->conn_ilg_lock); return (B_TRUE); } break; } } if (ilg == NULL) { rw_exit(&connp->conn_ilg_lock); return (B_FALSE); } /* * we have an ilg with matching ill and group; but * the ilg has a source list that we must check. */ IN6_IPADDR_TO_V4MAPPED(src, &v6src); isinlist = B_FALSE; for (i = 0; i < ilg->ilg_filter->sl_numsrc; i++) { if (IN6_ARE_ADDR_EQUAL(&v6src, &ilg->ilg_filter->sl_addr[i])) { isinlist = B_TRUE; break; } } if ((isinlist && ilg->ilg_fmode == MODE_IS_INCLUDE) || (!isinlist && ilg->ilg_fmode == MODE_IS_EXCLUDE)) { rw_exit(&connp->conn_ilg_lock); return (B_TRUE); } rw_exit(&connp->conn_ilg_lock); return (B_FALSE); } /* * Find an IPv6 ilg matching group, ill, and source */ boolean_t conn_hasmembers_ill_withsrc_v6(conn_t *connp, const in6_addr_t *v6group, const in6_addr_t *v6src, ill_t *ill) { int i; boolean_t isinlist; ilg_t *ilg; rw_enter(&connp->conn_ilg_lock, RW_READER); for (ilg = connp->conn_ilg; ilg != NULL; ilg = ilg->ilg_next) { if (ilg->ilg_condemned) continue; /* ilg_ill could be NULL if an add is in progress */ if (ilg->ilg_ill != ill) continue; /* The callers use upper ill for IPMP */ ASSERT(!IS_UNDER_IPMP(ill)); if (IN6_ARE_ADDR_EQUAL(&ilg->ilg_v6group, v6group)) { if (SLIST_IS_EMPTY(ilg->ilg_filter)) { /* no source filter, so this is a match */ rw_exit(&connp->conn_ilg_lock); return (B_TRUE); } break; } } if (ilg == NULL) { rw_exit(&connp->conn_ilg_lock); return (B_FALSE); } /* * we have an ilg with matching ill and group; but * the ilg has a source list that we must check. */ isinlist = B_FALSE; for (i = 0; i < ilg->ilg_filter->sl_numsrc; i++) { if (IN6_ARE_ADDR_EQUAL(v6src, &ilg->ilg_filter->sl_addr[i])) { isinlist = B_TRUE; break; } } if ((isinlist && ilg->ilg_fmode == MODE_IS_INCLUDE) || (!isinlist && ilg->ilg_fmode == MODE_IS_EXCLUDE)) { rw_exit(&connp->conn_ilg_lock); return (B_TRUE); } rw_exit(&connp->conn_ilg_lock); return (B_FALSE); } /* * Find an ilg matching group and ifaddr/ifindex. * We check both ifaddr and ifindex even though at most one of them * will be non-zero; that way we always find the right one. */ static ilg_t * ilg_lookup(conn_t *connp, const in6_addr_t *v6group, ipaddr_t ifaddr, uint_t ifindex) { ilg_t *ilg; ASSERT(RW_LOCK_HELD(&connp->conn_ilg_lock)); for (ilg = connp->conn_ilg; ilg != NULL; ilg = ilg->ilg_next) { if (ilg->ilg_condemned) continue; if (ilg->ilg_ifaddr == ifaddr && ilg->ilg_ifindex == ifindex && IN6_ARE_ADDR_EQUAL(&ilg->ilg_v6group, v6group)) return (ilg); } return (NULL); } /* * If a source address is passed in (src != NULL and src is not * unspecified), remove the specified src addr from the given ilg's * filter list, else delete the ilg. */ static void ilg_delete(conn_t *connp, ilg_t *ilg, const in6_addr_t *src) { ASSERT(RW_WRITE_HELD(&connp->conn_ilg_lock)); ASSERT(ilg->ilg_ptpn != NULL); ASSERT(!ilg->ilg_condemned); if (src == NULL || IN6_IS_ADDR_UNSPECIFIED(src)) { FREE_SLIST(ilg->ilg_filter); ilg->ilg_filter = NULL; ASSERT(ilg->ilg_ilm == NULL); ilg->ilg_ill = NULL; ilg->ilg_condemned = B_TRUE; /* ilg_inactive will unlink from the list */ ilg_refrele(ilg); } else { l_remove(ilg->ilg_filter, src); } } /* * Called from conn close. No new ilg can be added or removed * because CONN_CLOSING has been set by ip_close. ilg_add / ilg_delete * will return error if conn has started closing. * * We handle locking as follows. * Under conn_ilg_lock we get the first ilg. As we drop the conn_ilg_lock to * proceed with the ilm part of the delete we hold a reference on both the ill * and the ilg. This doesn't prevent changes to the ilg, but prevents it from * being deleted. * * Since the ilg_add code path uses two locks (conn_ilg_lock for the ilg part, * and ill_mcast_lock for the ip_addmulti part) we can run at a point between * the two. At that point ilg_ill is set, but ilg_ilm hasn't yet been set. In * that case we delete the ilg here, which makes ilg_add discover that the ilg * has disappeared when ip_addmulti returns, so it will discard the ilm it just * added. */ void ilg_delete_all(conn_t *connp) { ilg_t *ilg, *next_ilg, *held_ilg; ilm_t *ilm; ill_t *ill; boolean_t need_refrele; /* * Can not run if there is a conn_update_ill already running. * Wait for it to complete. Caller should have already set CONN_CLOSING * which prevents any new threads to run in conn_update_ill. */ mutex_enter(&connp->conn_lock); ASSERT(connp->conn_state_flags & CONN_CLOSING); while (connp->conn_state_flags & CONN_UPDATE_ILL) cv_wait(&connp->conn_cv, &connp->conn_lock); mutex_exit(&connp->conn_lock); rw_enter(&connp->conn_ilg_lock, RW_WRITER); ilg = connp->conn_ilg; held_ilg = NULL; while (ilg != NULL) { if (ilg->ilg_condemned) { ilg = ilg->ilg_next; continue; } /* If the ilg is detached then no need to serialize */ if (ilg->ilg_ilm == NULL) { next_ilg = ilg->ilg_next; ilg_delete(connp, ilg, NULL); ilg = next_ilg; continue; } ill = ilg->ilg_ilm->ilm_ill; /* * In order to serialize on the ill we try to enter * and if that fails we unlock and relock and then * check that we still have an ilm. */ need_refrele = B_FALSE; if (!mutex_tryenter(&ill->ill_mcast_serializer)) { ill_refhold(ill); need_refrele = B_TRUE; ilg_refhold(ilg); if (held_ilg != NULL) ilg_refrele(held_ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); mutex_enter(&ill->ill_mcast_serializer); rw_enter(&connp->conn_ilg_lock, RW_WRITER); if (ilg->ilg_condemned) { ilg = ilg->ilg_next; goto next; } } ilm = ilg->ilg_ilm; ilg->ilg_ilm = NULL; next_ilg = ilg->ilg_next; ilg_delete(connp, ilg, NULL); ilg = next_ilg; rw_exit(&connp->conn_ilg_lock); if (ilm != NULL) (void) ip_delmulti_serial(ilm, B_FALSE, B_TRUE); next: mutex_exit(&ill->ill_mcast_serializer); if (need_refrele) { /* Drop ill reference while we hold no locks */ ill_refrele(ill); } rw_enter(&connp->conn_ilg_lock, RW_WRITER); } if (held_ilg != NULL) ilg_refrele(held_ilg); rw_exit(&connp->conn_ilg_lock); } /* * Attach the ilg to an ilm on the ill. If it fails we leave ilg_ill as NULL so * that a subsequent attempt can attach it. * Drops and reacquires conn_ilg_lock. */ static void ilg_attach(conn_t *connp, ilg_t *ilg, ill_t *ill) { ilg_stat_t ilgstat; slist_t *new_filter; int new_fmode; in6_addr_t v6group; ipaddr_t ifaddr; uint_t ifindex; ilm_t *ilm; int error = 0; ASSERT(RW_WRITE_HELD(&connp->conn_ilg_lock)); /* * Alloc buffer to copy new state into (see below) before * we make any changes, so we can bail if it fails. */ if ((new_filter = l_alloc()) == NULL) return; /* * Save copy of ilg's filter state to pass to other functions, so * we can release conn_ilg_lock now. * Set ilg_ill so that an unplumb can find us. */ new_fmode = ilg->ilg_fmode; l_copy(ilg->ilg_filter, new_filter); v6group = ilg->ilg_v6group; ifaddr = ilg->ilg_ifaddr; ifindex = ilg->ilg_ifindex; ilgstat = ILGSTAT_NEW; ilg->ilg_ill = ill; ASSERT(ilg->ilg_ilm == NULL); rw_exit(&connp->conn_ilg_lock); ilm = ip_addmulti_serial(&v6group, ill, connp->conn_zoneid, ilgstat, new_fmode, new_filter, &error); l_free(new_filter); rw_enter(&connp->conn_ilg_lock, RW_WRITER); /* * Must look up the ilg again since we've not been holding * conn_ilg_lock. The ilg could have disappeared due to an unplumb * having called conn_update_ill, which can run once we dropped the * conn_ilg_lock above. */ ilg = ilg_lookup(connp, &v6group, ifaddr, ifindex); if (ilg == NULL) { if (ilm != NULL) { rw_exit(&connp->conn_ilg_lock); (void) ip_delmulti_serial(ilm, B_FALSE, (ilgstat == ILGSTAT_NEW)); rw_enter(&connp->conn_ilg_lock, RW_WRITER); } return; } if (ilm == NULL) { ilg->ilg_ill = NULL; return; } ASSERT(ilg->ilg_ilm == NULL); ilg->ilg_ilm = ilm; ilm->ilm_ifaddr = ifaddr; /* For netstat */ } /* * Called when an ill is unplumbed to make sure that there are no * dangling conn references to that ill. In that case ill is non-NULL and * we make sure we remove all references to it. * Also called when we should revisit the ilg_ill used for multicast * memberships, in which case ill is NULL. * * conn is held by caller. * * Note that ipcl_walk only walks conns that are not yet condemned. * condemned conns can't be refheld. For this reason, conn must become clean * first, i.e. it must not refer to any ill/ire and then only set * condemned flag. * * We leave ixa_multicast_ifindex in place. We prefer dropping * packets instead of sending them out the wrong interface. * * We keep the ilg around in a detached state (with ilg_ill and ilg_ilm being * NULL) so that the application can leave it later. Also, if ilg_ifaddr and * ilg_ifindex are zero, indicating that the system should pick the interface, * then we attempt to reselect the ill and join on it. * * Locking notes: * Under conn_ilg_lock we get the first ilg. As we drop the conn_ilg_lock to * proceed with the ilm part of the delete we hold a reference on both the ill * and the ilg. This doesn't prevent changes to the ilg, but prevents it from * being deleted. * * Note: if this function is called when new ill/ipif's arrive or change status * (SIOCSLIFINDEX, SIOCSLIFADDR) then we will attempt to attach any ilgs with * a NULL ilg_ill to an ill/ilm. */ static void conn_update_ill(conn_t *connp, caddr_t arg) { ill_t *ill = (ill_t *)arg; /* * We have to prevent ip_close/ilg_delete_all from running at * the same time. ip_close sets CONN_CLOSING before doing the ilg_delete * all, and we set CONN_UPDATE_ILL. That ensures that only one of * ilg_delete_all and conn_update_ill run at a time for a given conn. * If ilg_delete_all got here first, then we have nothing to do. */ mutex_enter(&connp->conn_lock); if (connp->conn_state_flags & (CONN_CLOSING|CONN_UPDATE_ILL)) { /* Caller has to wait for ill_ilm_cnt to drop to zero */ mutex_exit(&connp->conn_lock); return; } connp->conn_state_flags |= CONN_UPDATE_ILL; mutex_exit(&connp->conn_lock); if (ill != NULL) ilg_check_detach(connp, ill); ilg_check_reattach(connp); /* Do we need to wake up a thread in ilg_delete_all? */ mutex_enter(&connp->conn_lock); connp->conn_state_flags &= ~CONN_UPDATE_ILL; if (connp->conn_state_flags & CONN_CLOSING) cv_broadcast(&connp->conn_cv); mutex_exit(&connp->conn_lock); } /* Detach from an ill that is going away */ static void ilg_check_detach(conn_t *connp, ill_t *ill) { char group_buf[INET6_ADDRSTRLEN]; ilg_t *ilg, *held_ilg; ilm_t *ilm; mutex_enter(&ill->ill_mcast_serializer); rw_enter(&connp->conn_ilg_lock, RW_WRITER); held_ilg = NULL; for (ilg = connp->conn_ilg; ilg != NULL; ilg = ilg->ilg_next) { if (ilg->ilg_condemned) continue; if (ilg->ilg_ill != ill) continue; /* Detach from current ill */ ip1dbg(("ilg_check_detach: detach %s on %s\n", inet_ntop(AF_INET6, &ilg->ilg_v6group, group_buf, sizeof (group_buf)), ilg->ilg_ill->ill_name)); /* Detach this ilg from the ill/ilm */ ilm = ilg->ilg_ilm; ilg->ilg_ilm = NULL; ilg->ilg_ill = NULL; if (ilm == NULL) continue; /* Prevent ilg from disappearing */ ilg_transfer_hold(held_ilg, ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); (void) ip_delmulti_serial(ilm, B_FALSE, B_TRUE); rw_enter(&connp->conn_ilg_lock, RW_WRITER); } if (held_ilg != NULL) ilg_refrele(held_ilg); rw_exit(&connp->conn_ilg_lock); mutex_exit(&ill->ill_mcast_serializer); } /* * Check if there is a place to attach the conn_ilgs. We do this for both * detached ilgs and attached ones, since for the latter there could be * a better ill to attach them to. */ static void ilg_check_reattach(conn_t *connp) { ill_t *ill; char group_buf[INET6_ADDRSTRLEN]; ilg_t *ilg, *held_ilg; ilm_t *ilm; zoneid_t zoneid = IPCL_ZONEID(connp); int error; ip_stack_t *ipst = connp->conn_netstack->netstack_ip; rw_enter(&connp->conn_ilg_lock, RW_WRITER); held_ilg = NULL; for (ilg = connp->conn_ilg; ilg != NULL; ilg = ilg->ilg_next) { if (ilg->ilg_condemned) continue; /* Check if the conn_ill matches what we would pick now */ ill = ill_mcast_lookup(&ilg->ilg_v6group, ilg->ilg_ifaddr, ilg->ilg_ifindex, zoneid, ipst, &error); /* * Make sure the ill is usable for multicast and that * we can send the DL_ADDMULTI_REQ before we create an * ilm. */ if (ill != NULL && (!(ill->ill_flags & ILLF_MULTICAST) || !ill->ill_dl_up)) { /* Drop locks across ill_refrele */ ilg_transfer_hold(held_ilg, ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); ill_refrele(ill); ill = NULL; rw_enter(&connp->conn_ilg_lock, RW_WRITER); /* Note that ilg could have become condemned */ } /* Is the ill unchanged, even if both are NULL? */ if (ill == ilg->ilg_ill) { if (ill != NULL) { /* Drop locks across ill_refrele */ ilg_transfer_hold(held_ilg, ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); ill_refrele(ill); rw_enter(&connp->conn_ilg_lock, RW_WRITER); } continue; } /* Something changed; detach from old first if needed */ if (ilg->ilg_ill != NULL) { ill_t *ill2 = ilg->ilg_ill; boolean_t need_refrele = B_FALSE; /* * In order to serialize on the ill we try to enter * and if that fails we unlock and relock. */ if (!mutex_tryenter(&ill2->ill_mcast_serializer)) { ill_refhold(ill2); need_refrele = B_TRUE; ilg_transfer_hold(held_ilg, ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); mutex_enter(&ill2->ill_mcast_serializer); rw_enter(&connp->conn_ilg_lock, RW_WRITER); /* Note that ilg could have become condemned */ } /* * Check that nobody else re-attached the ilg while we * dropped the lock. */ if (ilg->ilg_ill == ill2) { ASSERT(!ilg->ilg_condemned); /* Detach from current ill */ ip1dbg(("conn_check_reattach: detach %s/%s\n", inet_ntop(AF_INET6, &ilg->ilg_v6group, group_buf, sizeof (group_buf)), ill2->ill_name)); ilm = ilg->ilg_ilm; ilg->ilg_ilm = NULL; ilg->ilg_ill = NULL; } else { ilm = NULL; } rw_exit(&connp->conn_ilg_lock); if (ilm != NULL) (void) ip_delmulti_serial(ilm, B_FALSE, B_TRUE); mutex_exit(&ill2->ill_mcast_serializer); if (need_refrele) { /* Drop ill reference while we hold no locks */ ill_refrele(ill2); } rw_enter(&connp->conn_ilg_lock, RW_WRITER); /* * While we dropped conn_ilg_lock some other thread * could have attached this ilg, thus we check again. */ if (ilg->ilg_ill != NULL) { if (ill != NULL) { /* Drop locks across ill_refrele */ ilg_transfer_hold(held_ilg, ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); ill_refrele(ill); rw_enter(&connp->conn_ilg_lock, RW_WRITER); } continue; } } if (ill != NULL) { /* * In order to serialize on the ill we try to enter * and if that fails we unlock and relock. */ if (!mutex_tryenter(&ill->ill_mcast_serializer)) { /* Already have a refhold on ill */ ilg_transfer_hold(held_ilg, ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); mutex_enter(&ill->ill_mcast_serializer); rw_enter(&connp->conn_ilg_lock, RW_WRITER); /* Note that ilg could have become condemned */ } /* * Check that nobody else attached the ilg and that * it wasn't condemned while we dropped the lock. */ if (ilg->ilg_ill == NULL && !ilg->ilg_condemned) { /* * Attach to the new ill. Can fail in which * case ilg_ill will remain NULL. ilg_attach * drops and reacquires conn_ilg_lock. */ ip1dbg(("conn_check_reattach: attach %s/%s\n", inet_ntop(AF_INET6, &ilg->ilg_v6group, group_buf, sizeof (group_buf)), ill->ill_name)); ilg_attach(connp, ilg, ill); ASSERT(RW_WRITE_HELD(&connp->conn_ilg_lock)); } mutex_exit(&ill->ill_mcast_serializer); /* Drop locks across ill_refrele */ ilg_transfer_hold(held_ilg, ilg); held_ilg = ilg; rw_exit(&connp->conn_ilg_lock); ill_refrele(ill); rw_enter(&connp->conn_ilg_lock, RW_WRITER); } } if (held_ilg != NULL) ilg_refrele(held_ilg); rw_exit(&connp->conn_ilg_lock); } /* * Called when an ill is unplumbed to make sure that there are no * dangling conn references to that ill. In that case ill is non-NULL and * we make sure we remove all references to it. * Also called when we should revisit the ilg_ill used for multicast * memberships, in which case ill is NULL. */ void update_conn_ill(ill_t *ill, ip_stack_t *ipst) { ipcl_walk(conn_update_ill, (caddr_t)ill, ipst); }