/* $NetBSD: mld6.c,v 1.49 2009/03/18 17:06:52 cegger Exp $ */ /* $KAME: mld6.c,v 1.25 2001/01/16 14:14:18 itojun Exp $ */ /* * Copyright (C) 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Stephen Deering of Stanford University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)igmp.c 8.1 (Berkeley) 7/19/93 */ /* * Copyright (c) 1988 Stephen Deering. * * This code is derived from software contributed to Berkeley by * Stephen Deering of Stanford University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)igmp.c 8.1 (Berkeley) 7/19/93 */ #include __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.49 2009/03/18 17:06:52 cegger Exp $"); #include "opt_inet.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * This structure is used to keep track of in6_multi chains which belong to * deleted interface addresses. */ static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */ struct multi6_kludge { LIST_ENTRY(multi6_kludge) mk_entry; struct ifnet *mk_ifp; struct in6_multihead mk_head; }; /* * Protocol constants */ /* * time between repetitions of a node's initial report of interest in a * multicast address(in seconds) */ #define MLD_UNSOLICITED_REPORT_INTERVAL 10 static struct ip6_pktopts ip6_opts; static void mld_start_listening(struct in6_multi *); static void mld_stop_listening(struct in6_multi *); static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *, int); static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *); static void mld_starttimer(struct in6_multi *); static void mld_stoptimer(struct in6_multi *); static u_long mld_timerresid(struct in6_multi *); void mld_init(void) { static u_int8_t hbh_buf[8]; struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); /* ip6h_nxt will be fill in later */ hbh->ip6h_len = 0; /* (8 >> 3) - 1 */ /* XXX: grotty hard coding... */ hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ hbh_buf[3] = 0; hbh_buf[4] = IP6OPT_RTALERT; hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; memcpy( &hbh_buf[6], (void *)&rtalert_code, sizeof(u_int16_t)); ip6_opts.ip6po_hbh = hbh; /* We will specify the hoplimit by a multicast option. */ ip6_opts.ip6po_hlim = -1; } static void mld_starttimer(struct in6_multi *in6m) { struct timeval now; microtime(&now); in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; in6m->in6m_timer_expire.tv_usec = now.tv_usec + (in6m->in6m_timer % hz) * (1000000 / hz); if (in6m->in6m_timer_expire.tv_usec > 1000000) { in6m->in6m_timer_expire.tv_sec++; in6m->in6m_timer_expire.tv_usec -= 1000000; } /* start or restart the timer */ callout_schedule(&in6m->in6m_timer_ch, in6m->in6m_timer); } static void mld_stoptimer(struct in6_multi *in6m) { if (in6m->in6m_timer == IN6M_TIMER_UNDEF) return; callout_stop(&in6m->in6m_timer_ch); in6m->in6m_timer = IN6M_TIMER_UNDEF; } static void mld_timeo(void *arg) { struct in6_multi *in6m = arg; mutex_enter(softnet_lock); KERNEL_LOCK(1, NULL); in6m->in6m_timer = IN6M_TIMER_UNDEF; switch (in6m->in6m_state) { case MLD_REPORTPENDING: mld_start_listening(in6m); break; default: mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); break; } KERNEL_UNLOCK_ONE(NULL); mutex_exit(softnet_lock); } static u_long mld_timerresid(struct in6_multi *in6m) { struct timeval now, diff; microtime(&now); if (now.tv_sec > in6m->in6m_timer_expire.tv_sec || (now.tv_sec == in6m->in6m_timer_expire.tv_sec && now.tv_usec > in6m->in6m_timer_expire.tv_usec)) { return (0); } diff = in6m->in6m_timer_expire; diff.tv_sec -= now.tv_sec; diff.tv_usec -= now.tv_usec; if (diff.tv_usec < 0) { diff.tv_sec--; diff.tv_usec += 1000000; } /* return the remaining time in milliseconds */ return diff.tv_sec * 1000 + diff.tv_usec / 1000; } static void mld_start_listening(struct in6_multi *in6m) { struct in6_addr all_in6; /* * RFC2710 page 10: * The node never sends a Report or Done for the link-scope all-nodes * address. * MLD messages are never sent for multicast addresses whose scope is 0 * (reserved) or 1 (node-local). */ all_in6 = in6addr_linklocal_allnodes; if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) { /* XXX: this should not happen! */ in6m->in6m_timer = 0; in6m->in6m_state = MLD_OTHERLISTENER; } if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) { in6m->in6m_timer = IN6M_TIMER_UNDEF; in6m->in6m_state = MLD_OTHERLISTENER; } else { mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); in6m->in6m_timer = arc4random() % (MLD_UNSOLICITED_REPORT_INTERVAL * hz); in6m->in6m_state = MLD_IREPORTEDLAST; mld_starttimer(in6m); } } static void mld_stop_listening(struct in6_multi *in6m) { struct in6_addr allnode, allrouter; allnode = in6addr_linklocal_allnodes; if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { /* XXX: this should not happen! */ return; } allrouter = in6addr_linklocal_allrouters; if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) { /* XXX impossible */ return; } if (in6m->in6m_state == MLD_IREPORTEDLAST && (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) && IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_INTFACELOCAL) { mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter); } } void mld_input(struct mbuf *m, int off) { struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct mld_hdr *mldh; struct ifnet *ifp = m->m_pkthdr.rcvif; struct in6_multi *in6m = NULL; struct in6_addr mld_addr, all_in6; struct in6_ifaddr *ia; u_long timer = 0; /* timer value in the MLD query header */ IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); if (mldh == NULL) { ICMP6_STATINC(ICMP6_STAT_TOOSHORT); return; } /* source address validation */ ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */ if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { /* * RFC3590 allows the IPv6 unspecified address as the source * address of MLD report and done messages. However, as this * same document says, this special rule is for snooping * switches and the RFC requires routers to discard MLD packets * with the unspecified source address. The RFC only talks * about hosts receiving an MLD query or report in Security * Considerations, but this is probably the correct intention. * RFC3590 does not talk about other cases than link-local and * the unspecified source addresses, but we believe the same * rule should be applied. * As a result, we only allow link-local addresses as the * source address; otherwise, simply discard the packet. */ #if 0 /* * XXX: do not log in an input path to avoid log flooding, * though RFC3590 says "SHOULD log" if the source of a query * is the unspecified address. */ log(LOG_INFO, "mld_input: src %s is not link-local (grp=%s)\n", ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr)); #endif m_freem(m); return; } /* * make a copy for local work (in6_setscope() may modify the 1st arg) */ mld_addr = mldh->mld_addr; if (in6_setscope(&mld_addr, ifp, NULL)) { /* XXX: this should not happen! */ m_free(m); return; } /* * In the MLD specification, there are 3 states and a flag. * * In Non-Listener state, we simply don't have a membership record. * In Delaying Listener state, our timer is running (in6m->in6m_timer) * In Idle Listener state, our timer is not running * (in6m->in6m_timer==IN6M_TIMER_UNDEF) * * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if * we have heard a report from another member, or MLD_IREPORTEDLAST * if we sent the last report. */ switch (mldh->mld_type) { case MLD_LISTENER_QUERY: if (ifp->if_flags & IFF_LOOPBACK) break; if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && !IN6_IS_ADDR_MULTICAST(&mld_addr)) break; /* print error or log stat? */ all_in6 = in6addr_linklocal_allnodes; if (in6_setscope(&all_in6, ifp, NULL)) { /* XXX: this should not happen! */ break; } /* * - 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-nodes" group (ff02::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. */ timer = ntohs(mldh->mld_maxdelay); IFP_TO_IA6(ifp, ia); if (ia == NULL) break; LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) { if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) continue; if (in6m->in6m_state == MLD_REPORTPENDING) continue; /* we are not yet ready */ if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) continue; if (timer == 0) { /* send a report immediately */ mld_stoptimer(in6m); mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); in6m->in6m_state = MLD_IREPORTEDLAST; } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || mld_timerresid(in6m) > timer) { in6m->in6m_timer = 1 + (arc4random() % timer) * hz / 1000; mld_starttimer(in6m); } } break; case MLD_LISTENER_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. * Note that it is impossible to check IFF_LOOPBACK flag of * ifp for this purpose, since ip6_mloopback pass the physical * interface to looutput. */ if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ break; if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr)) break; /* * If we belong to the group being reported, stop * our timer for that group. */ IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); if (in6m) { mld_stoptimer(in6m); /* transit to idle state */ in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ } break; default: /* this is impossible */ #if 0 /* * this case should be impossible because of filtering in * icmp6_input(). But we explicitly disabled this part * just in case. */ log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type); #endif break; } m_freem(m); } static void mld_sendpkt(struct in6_multi *in6m, int type, const struct in6_addr *dst) { struct mbuf *mh; struct mld_hdr *mldh; struct ip6_hdr *ip6 = NULL; struct ip6_moptions im6o; struct in6_ifaddr *ia = NULL; struct ifnet *ifp = in6m->in6m_ifp; int ignflags; /* * At first, find a link local address on the outgoing interface * to use as the source address of the MLD packet. * We do not reject tentative addresses for MLD report to deal with * the case where we first join a link-local address. */ ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE; if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL) return; if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) ia = NULL; /* Allocate two mbufs to store IPv6 header and MLD header */ mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type); if (mldh == NULL) return; /* fill src/dst here */ ip6 = mtod(mh, struct ip6_hdr *); ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any; ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; mldh->mld_addr = in6m->in6m_addr; in6_clearscope(&mldh->mld_addr); /* XXX */ mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), sizeof(struct mld_hdr)); /* construct multicast option */ memset(&im6o, 0, sizeof(im6o)); im6o.im6o_multicast_ifp = ifp; im6o.im6o_multicast_hlim = 1; /* * Request loopback of the report if we are acting as a multicast * router, so that the process-level routing daemon can hear it. */ im6o.im6o_multicast_loop = (ip6_mrouter != NULL); /* increment output statictics */ ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); icmp6_ifstat_inc(ifp, ifs6_out_msg); switch (type) { case MLD_LISTENER_QUERY: icmp6_ifstat_inc(ifp, ifs6_out_mldquery); break; case MLD_LISTENER_REPORT: icmp6_ifstat_inc(ifp, ifs6_out_mldreport); break; case MLD_LISTENER_DONE: icmp6_ifstat_inc(ifp, ifs6_out_mlddone); break; } ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, &im6o, (struct socket *)NULL, NULL); } static struct mld_hdr * mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m, int type) { struct mbuf *md; struct mld_hdr *mldh; struct ip6_hdr *ip6; /* * Allocate mbufs to store ip6 header and MLD header. * We allocate 2 mbufs and make chain in advance because * it is more convenient when inserting the hop-by-hop option later. */ MGETHDR(*mh, M_DONTWAIT, MT_HEADER); if (*mh == NULL) return NULL; MGET(md, M_DONTWAIT, MT_DATA); if (md == NULL) { m_free(*mh); *mh = NULL; return NULL; } (*mh)->m_next = md; md->m_next = NULL; (*mh)->m_pkthdr.rcvif = NULL; (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len; (*mh)->m_len = sizeof(struct ip6_hdr); MH_ALIGN(*mh, sizeof(struct ip6_hdr)); /* fill in the ip6 header */ ip6 = mtod(*mh, struct ip6_hdr *); memset(ip6, 0, sizeof(*ip6)); ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; /* ip6_plen will be set later */ ip6->ip6_nxt = IPPROTO_ICMPV6; /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */ /* fill in the MLD header as much as possible */ md->m_len = len; mldh = mtod(md, struct mld_hdr *); memset(mldh, 0, len); mldh->mld_type = type; return mldh; } /* * Add an address to the list of IP6 multicast addresses for a given interface. */ struct in6_multi * in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp, int timer) { struct in6_ifaddr *ia; struct in6_ifreq ifr; struct in6_multi *in6m; int s = splsoftnet(); *errorp = 0; /* * See if address already in list. */ IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); if (in6m != NULL) { /* * Found it; just increment the refrence count. */ in6m->in6m_refcount++; } else { /* * New address; allocate a new multicast record * and link it into the interface's multicast list. */ in6m = (struct in6_multi *) malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); if (in6m == NULL) { splx(s); *errorp = ENOBUFS; return (NULL); } memset(in6m, 0, sizeof(*in6m)); in6m->in6m_addr = *maddr6; in6m->in6m_ifp = ifp; in6m->in6m_refcount = 1; in6m->in6m_timer = IN6M_TIMER_UNDEF; IFP_TO_IA6(ifp, ia); if (ia == NULL) { free(in6m, M_IPMADDR); splx(s); *errorp = EADDRNOTAVAIL; /* appropriate? */ return (NULL); } in6m->in6m_ia = ia; IFAREF(&ia->ia_ifa); /* gain a reference */ LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); /* * Ask the network driver to update its multicast reception * filter appropriately for the new address. */ sockaddr_in6_init(&ifr.ifr_addr, maddr6, 0, 0, 0); *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, &ifr); if (*errorp) { LIST_REMOVE(in6m, in6m_entry); free(in6m, M_IPMADDR); IFAFREE(&ia->ia_ifa); splx(s); return (NULL); } callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE); callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m); in6m->in6m_timer = timer; if (in6m->in6m_timer > 0) { in6m->in6m_state = MLD_REPORTPENDING; mld_starttimer(in6m); splx(s); return (in6m); } /* * Let MLD6 know that we have joined a new IP6 multicast * group. */ mld_start_listening(in6m); } splx(s); return (in6m); } /* * Delete a multicast address record. */ void in6_delmulti(struct in6_multi *in6m) { struct in6_ifreq ifr; struct in6_ifaddr *ia; int s = splsoftnet(); mld_stoptimer(in6m); if (--in6m->in6m_refcount == 0) { /* * No remaining claims to this record; let MLD6 know * that we are leaving the multicast group. */ mld_stop_listening(in6m); /* * Unlink from list. */ LIST_REMOVE(in6m, in6m_entry); if (in6m->in6m_ia != NULL) { IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ in6m->in6m_ia = NULL; } /* * Delete all references of this multicasting group from * the membership arrays */ for (ia = in6_ifaddr; ia; ia = ia->ia_next) { struct in6_multi_mship *imm; LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { if (imm->i6mm_maddr == in6m) imm->i6mm_maddr = NULL; } } /* * Notify the network driver to update its multicast * reception filter. */ sockaddr_in6_init(&ifr.ifr_addr, &in6m->in6m_addr, 0, 0, 0); (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp, SIOCDELMULTI, &ifr); callout_destroy(&in6m->in6m_timer_ch); free(in6m, M_IPMADDR); } splx(s); } struct in6_multi_mship * in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp, int timer) { struct in6_multi_mship *imm; imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); if (!imm) { *errorp = ENOBUFS; return NULL; } memset(imm, 0, sizeof(*imm)); imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer); if (!imm->i6mm_maddr) { /* *errorp is already set */ free(imm, M_IPMADDR); return NULL; } return imm; } int in6_leavegroup(struct in6_multi_mship *imm) { if (imm->i6mm_maddr) { in6_delmulti(imm->i6mm_maddr); } free(imm, M_IPMADDR); return 0; } /* * Multicast address kludge: * If there were any multicast addresses attached to this interface address, * either move them to another address on this interface, or save them until * such time as this interface is reconfigured for IPv6. */ void in6_savemkludge(struct in6_ifaddr *oia) { struct in6_ifaddr *ia; struct in6_multi *in6m; IFP_TO_IA6(oia->ia_ifp, ia); if (ia) { /* there is another address */ KASSERT(ia != oia); while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) { LIST_REMOVE(in6m, in6m_entry); IFAREF(&ia->ia_ifa); IFAFREE(&in6m->in6m_ia->ia_ifa); in6m->in6m_ia = ia; LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); } } else { /* last address on this if deleted, save */ struct multi6_kludge *mk; LIST_FOREACH(mk, &in6_mk, mk_entry) { if (mk->mk_ifp == oia->ia_ifp) break; } if (mk == NULL) /* this should not happen! */ panic("in6_savemkludge: no kludge space"); while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) { LIST_REMOVE(in6m, in6m_entry); IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ in6m->in6m_ia = NULL; LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry); } } } /* * Continuation of multicast address hack: * If there was a multicast group list previously saved for this interface, * then we re-attach it to the first address configured on the i/f. */ void in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp) { struct multi6_kludge *mk; struct in6_multi *in6m; LIST_FOREACH(mk, &in6_mk, mk_entry) { if (mk->mk_ifp == ifp) break; } if (mk == NULL) return; while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) { LIST_REMOVE(in6m, in6m_entry); in6m->in6m_ia = ia; IFAREF(&ia->ia_ifa); LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); } } /* * Allocate space for the kludge at interface initialization time. * Formerly, we dynamically allocated the space in in6_savemkludge() with * malloc(M_WAITOK). However, it was wrong since the function could be called * under an interrupt context (software timer on address lifetime expiration). * Also, we cannot just give up allocating the strucutre, since the group * membership structure is very complex and we need to keep it anyway. * Of course, this function MUST NOT be called under an interrupt context. * Specifically, it is expected to be called only from in6_ifattach(), though * it is a global function. */ void in6_createmkludge(struct ifnet *ifp) { struct multi6_kludge *mk; LIST_FOREACH(mk, &in6_mk, mk_entry) { /* If we've already had one, do not allocate. */ if (mk->mk_ifp == ifp) return; } mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK); memset(mk, 0, sizeof(*mk)); LIST_INIT(&mk->mk_head); mk->mk_ifp = ifp; LIST_INSERT_HEAD(&in6_mk, mk, mk_entry); } void in6_purgemkludge(struct ifnet *ifp) { struct multi6_kludge *mk; struct in6_multi *in6m, *next; LIST_FOREACH(mk, &in6_mk, mk_entry) { if (mk->mk_ifp == ifp) break; } if (mk == NULL) return; /* leave from all multicast groups joined */ for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) { next = LIST_NEXT(in6m, in6m_entry); in6_delmulti(in6m); } LIST_REMOVE(mk, mk_entry); free(mk, M_IPMADDR); }