From cad2014b2749528351ec5180e88a5929efebbfc4 Mon Sep 17 00:00:00 2001 From: shin Date: Mon, 22 Nov 1999 02:45:11 +0000 Subject: KAME netinet6 basic part(no IPsec,no V6 Multicast Forwarding, no UDP/TCP for IPv6 yet) With this patch, you can assigne IPv6 addr automatically, and can reply to IPv6 ping. Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project --- sys/netinet6/mld6.c | 459 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 459 insertions(+) create mode 100644 sys/netinet6/mld6.c (limited to 'sys/netinet6/mld6.c') diff --git a/sys/netinet6/mld6.c b/sys/netinet6/mld6.c new file mode 100644 index 0000000..8c5824a --- /dev/null +++ b/sys/netinet6/mld6.c @@ -0,0 +1,459 @@ +/* + * 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. + * + * $FreeBSD$ + */ + +/* + * Copyright (c) 1988 Stephen Deering. + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Stephen Deering of Stanford University. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 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 "opt_inet.h" +#include "opt_ipsec.h" + +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include +#include +#include +#include +#include + +#include + +/* + * Protocol constants + */ + +/* denotes that the MLD max response delay field specifies time in milliseconds */ +#define MLD6_TIMER_SCALE 1000 +/* + * time between repetitions of a node's initial report of interest in a + * multicast address(in seconds) + */ +#define MLD6_UNSOLICITED_REPORT_INTERVAL 10 + +static struct ip6_pktopts ip6_opts; +static int mld6_timers_are_running; +/* XXX: These are necessary for KAME's link-local hack */ +static struct in6_addr mld6_all_nodes_linklocal = + IN6ADDR_LINKLOCAL_ALLNODES_INIT; +static struct in6_addr mld6_all_routers_linklocal = + IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; + +static void mld6_sendpkt __P((struct in6_multi *, int, + const struct in6_addr *)); + +void +mld6_init() +{ + 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); + + mld6_timers_are_running = 0; + + /* 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; + bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); + + ip6_opts.ip6po_hbh = hbh; + /* We will specify the hoplimit by a multicast option. */ + ip6_opts.ip6po_hlim = -1; +} + +void +mld6_start_listening(in6m) + struct in6_multi *in6m; +{ + int s = splnet(); + + /* + * (draft-ietf-ipngwg-mld, 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). + */ + mld6_all_nodes_linklocal.s6_addr16[1] = + htons(in6m->in6m_ifp->if_index); /* XXX */ + if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) || + IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) { + in6m->in6m_timer = 0; + in6m->in6m_state = MLD6_OTHERLISTENER; + } else { + mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL); + in6m->in6m_timer = MLD6_RANDOM_DELAY( + MLD6_UNSOLICITED_REPORT_INTERVAL * PR_FASTHZ); + in6m->in6m_state = MLD6_IREPORTEDLAST; + mld6_timers_are_running = 1; + } + splx(s); +} + +void +mld6_stop_listening(in6m) + struct in6_multi *in6m; +{ + mld6_all_nodes_linklocal.s6_addr16[1] = + htons(in6m->in6m_ifp->if_index); /* XXX */ + mld6_all_routers_linklocal.s6_addr16[1] = + htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */ + + if (in6m->in6m_state == MLD6_IREPORTEDLAST && + (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) && + IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL) + mld6_sendpkt(in6m, MLD6_LISTENER_DONE, + &mld6_all_routers_linklocal); +} + +void +mld6_input(m, off) + struct mbuf *m; + int off; +{ + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + struct mld6_hdr *mldh = (struct mld6_hdr *)(mtod(m, caddr_t) + off); + struct ifnet *ifp = m->m_pkthdr.rcvif; + struct in6_multi *in6m; + struct in6_ifaddr *ia; + struct ifmultiaddr *ifma; + int timer; /* timer value in the MLD query header */ + + /* source address validation */ + if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { + log(LOG_ERR, + "mld6_input: src %s is not link-local\n", + ip6_sprintf(&ip6->ip6_src)); + /* + * spec(draft-ietf-ipngwg-mld) does not explicitly + * specify to discard the packet from a non link-local + * source address. But we believe it's expected to do so. + */ + return; + } + + /* + * In the MLD6 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==0) + * + * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if + * we have heard a report from another member, or MLD6_IREPORTEDLAST + * if we sent the last report. + */ + switch(mldh->mld6_type) { + case MLD6_LISTENER_QUERY: + if (ifp->if_flags & IFF_LOOPBACK) + break; + + if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) && + !IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr)) + break; /* print error or log stat? */ + if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) + mldh->mld6_addr.s6_addr16[1] = + htons(ifp->if_index); /* XXX */ + + /* + * - 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. + */ + IFP_TO_IA6(ifp, ia); + if (ia == NULL) + break; + + /* + * XXX: System timer resolution is too low to handle Max + * Response Delay, so set 1 to the internal timer even if + * the calculated value equals to zero when Max Response + * Delay is positive. + */ + timer = ntohs(mldh->mld6_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE; + if (timer == 0 && mldh->mld6_maxdelay) + timer = 1; + mld6_all_nodes_linklocal.s6_addr16[1] = + htons(ifp->if_index); /* XXX */ + + LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) + { + if (ifma->ifma_addr->sa_family != AF_INET6) + continue; + in6m = (struct in6_multi *)ifma->ifma_protospec; + if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, + &mld6_all_nodes_linklocal) || + IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < + IPV6_ADDR_SCOPE_LINKLOCAL) + continue; + + if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) || + IN6_ARE_ADDR_EQUAL(&mldh->mld6_addr, + &in6m->in6m_addr)) + { + if (timer == 0) { + /* send a report immediately */ + mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, + NULL); + in6m->in6m_timer = 0; /* reset timer */ + in6m->in6m_state = MLD6_IREPORTEDLAST; + } else if (in6m->in6m_timer == 0 || /*idle state*/ + in6m->in6m_timer > timer) { + in6m->in6m_timer = + MLD6_RANDOM_DELAY(timer); + mld6_timers_are_running = 1; + } + } + } + + if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) + mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ + break; + case MLD6_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->mld6_addr)) + break; + + if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) + mldh->mld6_addr.s6_addr16[1] = + htons(ifp->if_index); /* XXX */ + /* + * If we belong to the group being reported, stop + * our timer for that group. + */ + IN6_LOOKUP_MULTI(mldh->mld6_addr, ifp, in6m); + if (in6m) { + in6m->in6m_timer = 0; /* transit to idle state */ + in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */ + } + + if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) + mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ + break; + default: /* this is impossible */ + log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld6_type); + break; + } +} + +void +mld6_fasttimeo() +{ + register struct in6_multi *in6m; + struct in6_multistep step; + int s; + + /* + * Quick check to see if any work needs to be done, in order + * to minimize the overhead of fasttimo processing. + */ + if (!mld6_timers_are_running) + return; + + s = splnet(); + mld6_timers_are_running = 0; + IN6_FIRST_MULTI(step, in6m); + while (in6m != NULL) { + if (in6m->in6m_timer == 0) { + /* do nothing */ + } else if (--in6m->in6m_timer == 0) { + mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL); + in6m->in6m_state = MLD6_IREPORTEDLAST; + } else { + mld6_timers_are_running = 1; + } + IN6_NEXT_MULTI(step, in6m); + } + splx(s); +} + +static void +mld6_sendpkt(in6m, type, dst) + struct in6_multi *in6m; + int type; + const struct in6_addr *dst; +{ + struct mbuf *mh, *md; + struct mld6_hdr *mldh; + struct ip6_hdr *ip6; + struct ip6_moptions im6o; + struct in6_ifaddr *ia; + struct ifnet *ifp = in6m->in6m_ifp; + struct ifnet *outif = NULL; + + /* + * At first, find a link local address on the outgoing interface + * to use as the source address of the MLD packet. + */ + if ((ia = in6ifa_ifpforlinklocal(ifp)) == NULL) + return; + + /* + * 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; + MGET(md, M_DONTWAIT, MT_DATA); + if (md == NULL) { + m_free(mh); + return; + } + mh->m_next = md; + +#ifdef IPSEC + mh->m_pkthdr.rcvif = NULL; +#endif + mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld6_hdr); + 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 *); + ip6->ip6_flow = 0; + 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->ip6_src = ia->ia_addr.sin6_addr; + ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; + + /* fill in the MLD header */ + md->m_len = sizeof(struct mld6_hdr); + mldh = mtod(md, struct mld6_hdr *); + mldh->mld6_type = type; + mldh->mld6_code = 0; + mldh->mld6_cksum = 0; + /* XXX: we assume the function will not be called for query messages */ + mldh->mld6_maxdelay = 0; + mldh->mld6_reserved = 0; + mldh->mld6_addr = in6m->in6m_addr; + if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) + mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ + mldh->mld6_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), + sizeof(struct mld6_hdr)); + + /* construct multicast option */ + bzero(&im6o, 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 = 0; + + /* increment output statictics */ + icmp6stat.icp6s_outhist[type]++; + + ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif); + if (outif) { + icmp6_ifstat_inc(outif, ifs6_out_msg); + switch(type) { + case MLD6_LISTENER_QUERY: + icmp6_ifstat_inc(outif, ifs6_out_mldquery); + break; + case MLD6_LISTENER_REPORT: + icmp6_ifstat_inc(outif, ifs6_out_mldreport); + break; + case MLD6_LISTENER_DONE: + icmp6_ifstat_inc(outif, ifs6_out_mlddone); + break; + } + } +} -- cgit v1.1