/* $OpenBSD: ip6_mroute.c,v 1.25 2002/06/08 21:51:08 itojun Exp $ */ /* $KAME: ip6_mroute.c,v 1.45 2001/03/25 08:38:51 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. */ /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ /* * IP multicast forwarding procedures * * Written by David Waitzman, BBN Labs, August 1988. * Modified by Steve Deering, Stanford, February 1989. * Modified by Mark J. Steiglitz, Stanford, May, 1991 * Modified by Van Jacobson, LBL, January 1993 * Modified by Ajit Thyagarajan, PARC, August 1993 * Modified by Bill Fenenr, PARC, April 1994 * * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support */ #ifndef _KERNEL # ifdef KERNEL # define _KERNEL # endif #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); static int set_pim6(int *); static int get_pim6(struct mbuf *); static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in6 *); static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); /* * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static, * except for netstat or debugging purposes. */ struct socket *ip6_mrouter = NULL; int ip6_mrouter_ver = 0; int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */ struct mrt6stat mrt6stat; #define NO_RTE_FOUND 0x1 #define RTE_FOUND 0x2 struct mf6c *mf6ctable[MF6CTBLSIZ]; u_char n6expire[MF6CTBLSIZ]; struct mif6 mif6table[MAXMIFS]; #ifdef MRT6DEBUG u_int mrt6debug = 0; /* debug level */ #define DEBUG_MFC 0x02 #define DEBUG_FORWARD 0x04 #define DEBUG_EXPIRE 0x08 #define DEBUG_XMIT 0x10 #define DEBUG_REG 0x20 #define DEBUG_PIM 0x40 #endif static void expire_upcalls(void *); #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ #define UPCALL_EXPIRE 6 /* number of timeouts */ #ifdef INET #ifdef MROUTING extern struct socket *ip_mrouter; #endif #endif /* * 'Interfaces' associated with decapsulator (so we can tell * packets that went through it from ones that get reflected * by a broken gateway). These interfaces are never linked into * the system ifnet list & no routes point to them. I.e., packets * can't be sent this way. They only exist as a placeholder for * multicast source verification. */ struct ifnet multicast_register_if; #define ENCAP_HOPS 64 /* * Private variables. */ static mifi_t nummifs = 0; static mifi_t reg_mif_num = (mifi_t)-1; static struct pim6stat pim6stat; static int pim6; /* * Hash function for a source, group entry */ #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ (g).s6_addr32[2] ^ (g).s6_addr32[3]) /* * Find a route for a given origin IPv6 address and Multicast group address. * Quality of service parameter to be added in the future!!! */ #define MF6CFIND(o, g, rt) do { \ struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ rt = NULL; \ mrt6stat.mrt6s_mfc_lookups++; \ while (_rt) { \ if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ (_rt->mf6c_stall == NULL)) { \ rt = _rt; \ break; \ } \ _rt = _rt->mf6c_next; \ } \ if (rt == NULL) { \ mrt6stat.mrt6s_mfc_misses++; \ } \ } while (0) /* * Macros to compute elapsed time efficiently * Borrowed from Van Jacobson's scheduling code */ #define TV_DELTA(a, b, delta) do { \ int xxs; \ \ delta = (a).tv_usec - (b).tv_usec; \ if ((xxs = (a).tv_sec - (b).tv_sec)) { \ switch (xxs) { \ case 2: \ delta += 1000000; \ /* FALLTHROUGH */ \ case 1: \ delta += 1000000; \ break; \ default: \ delta += (1000000 * xxs); \ } \ } \ } while (0) #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) #ifdef UPCALL_TIMING #define UPCALL_MAX 50 u_long upcall_data[UPCALL_MAX + 1]; static void collate(); #endif /* UPCALL_TIMING */ static int get_sg_cnt(struct sioc_sg_req6 *); static int get_mif6_cnt(struct sioc_mif_req6 *); static int ip6_mrouter_init(struct socket *, struct mbuf *, int); static int add_m6if(struct mif6ctl *); static int del_m6if(mifi_t *); static int add_m6fc(struct mf6cctl *); static int del_m6fc(struct mf6cctl *); static struct timeout expire_upcalls_ch; /* * Handle MRT setsockopt commands to modify the multicast routing tables. */ int ip6_mrouter_set(cmd, so, m) int cmd; struct socket *so; struct mbuf *m; { if (cmd != MRT6_INIT && so != ip6_mrouter) return EACCES; switch (cmd) { #ifdef MRT6_OINIT case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd); #endif case MRT6_INIT: return ip6_mrouter_init(so, m, cmd); case MRT6_DONE: return ip6_mrouter_done(); case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *)); case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *)); case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *)); case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *)); case MRT6_PIM: return set_pim6(mtod(m, int *)); default: return EOPNOTSUPP; } } /* * Handle MRT getsockopt commands */ int ip6_mrouter_get(cmd, so, m) int cmd; struct socket *so; struct mbuf **m; { struct mbuf *mb; if (so != ip6_mrouter) return EACCES; *m = mb = m_get(M_WAIT, MT_SOOPTS); switch (cmd) { case MRT6_PIM: return get_pim6(mb); default: m_free(mb); return EOPNOTSUPP; } } /* * Handle ioctl commands to obtain information from the cache */ int mrt6_ioctl(cmd, data) int cmd; caddr_t data; { int error = 0; switch (cmd) { case SIOCGETSGCNT_IN6: return(get_sg_cnt((struct sioc_sg_req6 *)data)); break; /* for safety */ case SIOCGETMIFCNT_IN6: return(get_mif6_cnt((struct sioc_mif_req6 *)data)); break; /* for safety */ default: return (EINVAL); break; } return error; } /* * returns the packet, byte, rpf-failure count for the source group provided */ static int get_sg_cnt(req) struct sioc_sg_req6 *req; { struct mf6c *rt; int s; s = splsoftnet(); MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); splx(s); if (rt != NULL) { req->pktcnt = rt->mf6c_pkt_cnt; req->bytecnt = rt->mf6c_byte_cnt; req->wrong_if = rt->mf6c_wrong_if; } else return(ESRCH); #if 0 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff; #endif return 0; } /* * returns the input and output packet and byte counts on the mif provided */ static int get_mif6_cnt(req) struct sioc_mif_req6 *req; { mifi_t mifi = req->mifi; if (mifi >= nummifs) return EINVAL; req->icount = mif6table[mifi].m6_pkt_in; req->ocount = mif6table[mifi].m6_pkt_out; req->ibytes = mif6table[mifi].m6_bytes_in; req->obytes = mif6table[mifi].m6_bytes_out; return 0; } /* * Get PIM processiong global */ static int get_pim6(m) struct mbuf *m; { int *i; i = mtod(m, int *); *i = pim6; return 0; } static int set_pim6(i) int *i; { if ((*i != 1) && (*i != 0)) return EINVAL; pim6 = *i; return 0; } /* * Enable multicast routing */ static int ip6_mrouter_init(so, m, cmd) struct socket *so; struct mbuf *m; int cmd; { int *v; #ifdef MRT6DEBUG if (mrt6debug) log(LOG_DEBUG, "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", so->so_type, so->so_proto->pr_protocol); #endif if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_ICMPV6) return EOPNOTSUPP; if (!m || (m->m_len != sizeof(int *))) return ENOPROTOOPT; v = mtod(m, int *); if (*v != 1) return ENOPROTOOPT; if (ip6_mrouter != NULL) return EADDRINUSE; ip6_mrouter = so; ip6_mrouter_ver = cmd; bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); bzero((caddr_t)n6expire, sizeof(n6expire)); pim6 = 0;/* used for stubbing out/in pim stuff */ timeout_set(&expire_upcalls_ch, expire_upcalls, NULL); timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT); #ifdef MRT6DEBUG if (mrt6debug) log(LOG_DEBUG, "ip6_mrouter_init\n"); #endif return 0; } /* * Disable multicast routing */ int ip6_mrouter_done() { mifi_t mifi; int i; struct ifnet *ifp; struct in6_ifreq ifr; struct mf6c *rt; struct rtdetq *rte; int s; s = splsoftnet(); /* * For each phyint in use, disable promiscuous reception of all IPv6 * multicasts. */ #ifdef INET #ifdef MROUTING /* * If there is still IPv4 multicast routing daemon, * we remain interfaces to receive all muliticasted packets. * XXX: there may be an interface in which the IPv4 multicast * daemon is not interested... */ if (!ip_mrouter) #endif #endif { for (mifi = 0; mifi < nummifs; mifi++) { if (mif6table[mifi].m6_ifp && !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { ifr.ifr_addr.sin6_family = AF_INET6; ifr.ifr_addr.sin6_addr= in6addr_any; ifp = mif6table[mifi].m6_ifp; (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); } } } #ifdef notyet bzero((caddr_t)qtable, sizeof(qtable)); bzero((caddr_t)tbftable, sizeof(tbftable)); #endif bzero((caddr_t)mif6table, sizeof(mif6table)); nummifs = 0; pim6 = 0; /* used to stub out/in pim specific code */ timeout_del(&expire_upcalls_ch); /* * Free all multicast forwarding cache entries. */ for (i = 0; i < MF6CTBLSIZ; i++) { rt = mf6ctable[i]; while (rt) { struct mf6c *frt; for (rte = rt->mf6c_stall; rte != NULL; ) { struct rtdetq *n = rte->next; m_free(rte->m); free(rte, M_MRTABLE); rte = n; } frt = rt; rt = rt->mf6c_next; free(frt, M_MRTABLE); } } bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); /* * Reset de-encapsulation cache */ reg_mif_num = -1; ip6_mrouter = NULL; ip6_mrouter_ver = 0; splx(s); #ifdef MRT6DEBUG if (mrt6debug) log(LOG_DEBUG, "ip6_mrouter_done\n"); #endif return 0; } static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; /* * Add a mif to the mif table */ static int add_m6if(mifcp) struct mif6ctl *mifcp; { struct mif6 *mifp; struct ifnet *ifp; struct in6_ifreq ifr; int error, s; #ifdef notyet struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi; #endif if (mifcp->mif6c_mifi >= MAXMIFS) return EINVAL; mifp = mif6table + mifcp->mif6c_mifi; if (mifp->m6_ifp) return EADDRINUSE; /* XXX: is it appropriate? */ if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) return ENXIO; ifp = ifindex2ifnet[mifcp->mif6c_pifi]; if (mifcp->mif6c_flags & MIFF_REGISTER) { if (reg_mif_num == (mifi_t)-1) { strcpy(multicast_register_if.if_xname, "register_mif"); /* XXX */ multicast_register_if.if_flags |= IFF_LOOPBACK; multicast_register_if.if_index = mifcp->mif6c_mifi; reg_mif_num = mifcp->mif6c_mifi; } ifp = &multicast_register_if; } /* if REGISTER */ else { /* Make sure the interface supports multicast */ if ((ifp->if_flags & IFF_MULTICAST) == 0) return EOPNOTSUPP; s = splsoftnet(); /* * Enable promiscuous reception of all IPv6 multicasts * from the interface. */ ifr.ifr_addr.sin6_family = AF_INET6; ifr.ifr_addr.sin6_addr = in6addr_any; error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); splx(s); if (error) return error; } s = splsoftnet(); mifp->m6_flags = mifcp->mif6c_flags; mifp->m6_ifp = ifp; #ifdef notyet /* scaling up here allows division by 1024 in critical code */ mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000; #endif /* initialize per mif pkt counters */ mifp->m6_pkt_in = 0; mifp->m6_pkt_out = 0; mifp->m6_bytes_in = 0; mifp->m6_bytes_out = 0; splx(s); /* Adjust nummifs up if the mifi is higher than nummifs */ if (nummifs <= mifcp->mif6c_mifi) nummifs = mifcp->mif6c_mifi + 1; #ifdef MRT6DEBUG if (mrt6debug) log(LOG_DEBUG, "add_mif #%d, phyint %s%d\n", mifcp->mif6c_mifi, ifp->if_name, ifp->if_unit); #endif return 0; } /* * Delete a mif from the mif table */ static int del_m6if(mifip) mifi_t *mifip; { struct mif6 *mifp = mif6table + *mifip; mifi_t mifi; struct ifnet *ifp; struct in6_ifreq ifr; int s; if (*mifip >= nummifs) return EINVAL; if (mifp->m6_ifp == NULL) return EINVAL; s = splsoftnet(); if (!(mifp->m6_flags & MIFF_REGISTER)) { /* * XXX: what if there is yet IPv4 multicast daemon * using the interface? */ ifp = mifp->m6_ifp; ifr.ifr_addr.sin6_family = AF_INET6; ifr.ifr_addr.sin6_addr = in6addr_any; (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr); } #ifdef notyet bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip])); bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf))); #endif bzero((caddr_t)mifp, sizeof (*mifp)); /* Adjust nummifs down */ for (mifi = nummifs; mifi > 0; mifi--) if (mif6table[mifi - 1].m6_ifp) break; nummifs = mifi; splx(s); #ifdef MRT6DEBUG if (mrt6debug) log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); #endif return 0; } /* * Add an mfc entry */ static int add_m6fc(mfccp) struct mf6cctl *mfccp; { struct mf6c *rt; u_long hash; struct rtdetq *rte; u_short nstl; int s; MF6CFIND(mfccp->mf6cc_origin.sin6_addr, mfccp->mf6cc_mcastgrp.sin6_addr, rt); /* If an entry already exists, just update the fields */ if (rt) { #ifdef MRT6DEBUG if (mrt6debug & DEBUG_MFC) log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n", ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent); #endif s = splsoftnet(); rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; splx(s); return 0; } /* * Find the entry for which the upcall was made and update */ s = splsoftnet(); hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, mfccp->mf6cc_mcastgrp.sin6_addr); for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, &mfccp->mf6cc_origin.sin6_addr) && IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, &mfccp->mf6cc_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) { if (nstl++) log(LOG_ERR, "add_m6fc: %s o %s g %s p %x dbx %p\n", "multiple kernel entries", ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent, rt->mf6c_stall); #ifdef MRT6DEBUG if (mrt6debug & DEBUG_MFC) log(LOG_DEBUG, "add_m6fc o %s g %s p %x dbg %x\n", ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent, rt->mf6c_stall); #endif rt->mf6c_origin = mfccp->mf6cc_origin; rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; /* initialize pkt counters per src-grp */ rt->mf6c_pkt_cnt = 0; rt->mf6c_byte_cnt = 0; rt->mf6c_wrong_if = 0; rt->mf6c_expire = 0; /* Don't clean this guy up */ n6expire[hash]--; /* free packets Qed at the end of this entry */ for (rte = rt->mf6c_stall; rte != NULL; ) { struct rtdetq *n = rte->next; ip6_mdq(rte->m, rte->ifp, rt); m_freem(rte->m); #ifdef UPCALL_TIMING collate(&(rte->t)); #endif /* UPCALL_TIMING */ free(rte, M_MRTABLE); rte = n; } rt->mf6c_stall = NULL; } } /* * It is possible that an entry is being inserted without an upcall */ if (nstl == 0) { #ifdef MRT6DEBUG if (mrt6debug & DEBUG_MFC) log(LOG_DEBUG, "add_m6fc no upcall h %d o %s g %s p %x\n", hash, ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent); #endif for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, &mfccp->mf6cc_origin.sin6_addr)&& IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, &mfccp->mf6cc_mcastgrp.sin6_addr)) { rt->mf6c_origin = mfccp->mf6cc_origin; rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; /* initialize pkt counters per src-grp */ rt->mf6c_pkt_cnt = 0; rt->mf6c_byte_cnt = 0; rt->mf6c_wrong_if = 0; if (rt->mf6c_expire) n6expire[hash]--; rt->mf6c_expire = 0; } } if (rt == NULL) { /* no upcall, so make a new entry */ rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); if (rt == NULL) { splx(s); return ENOBUFS; } /* insert new entry at head of hash chain */ rt->mf6c_origin = mfccp->mf6cc_origin; rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; /* initialize pkt counters per src-grp */ rt->mf6c_pkt_cnt = 0; rt->mf6c_byte_cnt = 0; rt->mf6c_wrong_if = 0; rt->mf6c_expire = 0; rt->mf6c_stall = NULL; /* link into table */ rt->mf6c_next = mf6ctable[hash]; mf6ctable[hash] = rt; } } splx(s); return 0; } #ifdef UPCALL_TIMING /* * collect delay statistics on the upcalls */ static void collate(t) struct timeval *t; { u_long d; struct timeval tp; u_long delta; GET_TIME(tp); if (TV_LT(*t, tp)) { TV_DELTA(tp, *t, delta); d = delta >> 10; if (d > UPCALL_MAX) d = UPCALL_MAX; ++upcall_data[d]; } } #endif /* UPCALL_TIMING */ /* * Delete an mfc entry */ static int del_m6fc(mfccp) struct mf6cctl *mfccp; { struct sockaddr_in6 origin; struct sockaddr_in6 mcastgrp; struct mf6c *rt; struct mf6c **nptr; u_long hash; int s; origin = mfccp->mf6cc_origin; mcastgrp = mfccp->mf6cc_mcastgrp; hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); #ifdef MRT6DEBUG if (mrt6debug & DEBUG_MFC) log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", ip6_sprintf(&origin.sin6_addr), ip6_sprintf(&mcastgrp.sin6_addr)); #endif s = splsoftnet(); nptr = &mf6ctable[hash]; while ((rt = *nptr) != NULL) { if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, &rt->mf6c_origin.sin6_addr) && IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, &rt->mf6c_mcastgrp.sin6_addr) && rt->mf6c_stall == NULL) break; nptr = &rt->mf6c_next; } if (rt == NULL) { splx(s); return EADDRNOTAVAIL; } *nptr = rt->mf6c_next; free(rt, M_MRTABLE); splx(s); return 0; } static int socket_send(s, mm, src) struct socket *s; struct mbuf *mm; struct sockaddr_in6 *src; { if (s) { if (sbappendaddr(&s->so_rcv, (struct sockaddr *)src, mm, (struct mbuf *)0) != 0) { sorwakeup(s); return 0; } } m_freem(mm); return -1; } /* * IPv6 multicast forwarding function. This function assumes that the packet * pointed to by "ip6" has arrived on (or is about to be sent to) the interface * pointed to by "ifp", and the packet is to be relayed to other networks * that have members of the packet's destination IPv6 multicast group. * * The packet is returned unscathed to the caller, unless it is * erroneous, in which case a non-zero return value tells the caller to * discard it. */ int ip6_mforward(ip6, ifp, m) struct ip6_hdr *ip6; struct ifnet *ifp; struct mbuf *m; { struct mf6c *rt; struct mif6 *mifp; struct mbuf *mm; int s; mifi_t mifi; long time_second = time.tv_sec; #ifdef MRT6DEBUG if (mrt6debug & DEBUG_FORWARD) log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), ifp->if_index); #endif /* * Don't forward a packet with Hop limit of zero or one, * or a packet destined to a local-only group. */ if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) || IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) return 0; ip6->ip6_hlim--; /* * Source address check: do not forward packets with unspecified * source. It was discussed in July 2000, on ipngwg mailing list. * This is rather more serious than unicast cases, because some * MLD packets can be sent with the unspecified source address * (although such packets must normally set 1 to the hop limit field). */ if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { ip6stat.ip6s_cantforward++; if (ip6_log_time + ip6_log_interval < time_second) { ip6_log_time = time_second; log(LOG_DEBUG, "cannot forward " "from %s to %s nxt %d received on %s\n", ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), ip6->ip6_nxt, m->m_pkthdr.rcvif->if_xname); } return 0; } /* * Determine forwarding mifs from the forwarding cache table */ s = splsoftnet(); MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); /* Entry exists, so forward if necessary */ if (rt) { splx(s); return (ip6_mdq(m, ifp, rt)); } else { /* * If we don't have a route for packet's origin, * Make a copy of the packet & * send message to routing daemon */ struct mbuf *mb0; struct rtdetq *rte; u_long hash; /* int i, npkts;*/ #ifdef UPCALL_TIMING struct timeval tp; GET_TIME(tp); #endif /* UPCALL_TIMING */ mrt6stat.mrt6s_no_route++; #ifdef MRT6DEBUG if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); #endif /* * Allocate mbufs early so that we don't do extra work if we * are just going to fail anyway. */ rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE, M_NOWAIT); if (rte == NULL) { splx(s); return ENOBUFS; } mb0 = m_copy(m, 0, M_COPYALL); /* * Pullup packet header if needed before storing it, * as other references may modify it in the meantime. */ if (mb0 && (M_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); if (mb0 == NULL) { free(rte, M_MRTABLE); splx(s); return ENOBUFS; } /* is there an upcall waiting for this packet? */ hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &rt->mf6c_origin.sin6_addr) && IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) break; } if (rt == NULL) { struct mrt6msg *im; #ifdef MRT6_OINIT struct omrt6msg *oim; #endif /* no upcall, so make a new entry */ rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT); if (rt == NULL) { free(rte, M_MRTABLE); m_freem(mb0); splx(s); return ENOBUFS; } /* * Make a copy of the header to send to the user * level process */ mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); if (mm == NULL) { free(rte, M_MRTABLE); m_freem(mb0); free(rt, M_MRTABLE); splx(s); return ENOBUFS; } /* * Send message to routing daemon */ sin6.sin6_addr = ip6->ip6_src; im = NULL; #ifdef MRT6_OINIT oim = NULL; #endif switch (ip6_mrouter_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim = mtod(mm, struct omrt6msg *); oim->im6_msgtype = MRT6MSG_NOCACHE; oim->im6_mbz = 0; break; #endif case MRT6_INIT: im = mtod(mm, struct mrt6msg *); im->im6_msgtype = MRT6MSG_NOCACHE; im->im6_mbz = 0; break; default: free(rte, M_MRTABLE); m_freem(mb0); free(rt, M_MRTABLE); splx(s); return EINVAL; } #ifdef MRT6DEBUG if (mrt6debug & DEBUG_FORWARD) log(LOG_DEBUG, "getting the iif info in the kernel\n"); #endif for (mifp = mif6table, mifi = 0; mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) ; switch (ip6_mrouter_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim->im6_mif = mifi; break; #endif case MRT6_INIT: im->im6_mif = mifi; break; } if (socket_send(ip6_mrouter, mm, &sin6) < 0) { log(LOG_WARNING, "ip6_mforward: ip6_mrouter " "socket queue full\n"); mrt6stat.mrt6s_upq_sockfull++; free(rte, M_MRTABLE); m_freem(mb0); free(rt, M_MRTABLE); splx(s); return ENOBUFS; } mrt6stat.mrt6s_upcalls++; /* insert new entry at head of hash chain */ bzero(rt, sizeof(*rt)); rt->mf6c_origin.sin6_family = AF_INET6; rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); rt->mf6c_origin.sin6_addr = ip6->ip6_src; rt->mf6c_mcastgrp.sin6_family = AF_INET6; rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; rt->mf6c_expire = UPCALL_EXPIRE; n6expire[hash]++; rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; /* link into table */ rt->mf6c_next = mf6ctable[hash]; mf6ctable[hash] = rt; /* Add this entry to the end of the queue */ rt->mf6c_stall = rte; } else { /* determine if q has overflowed */ struct rtdetq **p; int npkts = 0; for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) if (++npkts > MAX_UPQ6) { mrt6stat.mrt6s_upq_ovflw++; free(rte, M_MRTABLE); m_freem(mb0); splx(s); return 0; } /* Add this entry to the end of the queue */ *p = rte; } rte->next = NULL; rte->m = mb0; rte->ifp = ifp; #ifdef UPCALL_TIMING rte->t = tp; #endif /* UPCALL_TIMING */ splx(s); return 0; } } /* * Clean up cache entries if upcalls are not serviced * Call from the Slow Timeout mechanism, every half second. */ static void expire_upcalls(unused) void *unused; { struct rtdetq *rte; struct mf6c *mfc, **nptr; int i; int s; s = splsoftnet(); for (i = 0; i < MF6CTBLSIZ; i++) { if (n6expire[i] == 0) continue; nptr = &mf6ctable[i]; while ((mfc = *nptr) != NULL) { rte = mfc->mf6c_stall; /* * Skip real cache entries * Make sure it wasn't marked to not expire (shouldn't happen) * If it expires now */ if (rte != NULL && mfc->mf6c_expire != 0 && --mfc->mf6c_expire == 0) { #ifdef MRT6DEBUG if (mrt6debug & DEBUG_EXPIRE) log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", ip6_sprintf(&mfc->mf6c_origin.sin6_addr), ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr)); #endif /* * drop all the packets * free the mbuf with the pkt, if, timing info */ do { struct rtdetq *n = rte->next; m_freem(rte->m); free(rte, M_MRTABLE); rte = n; } while (rte != NULL); mrt6stat.mrt6s_cache_cleanups++; n6expire[i]--; *nptr = mfc->mf6c_next; free(mfc, M_MRTABLE); } else { nptr = &mfc->mf6c_next; } } } splx(s); timeout_set(&expire_upcalls_ch, expire_upcalls, NULL); timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT); } /* * Packet forwarding routine once entry in the cache is made */ static int ip6_mdq(m, ifp, rt) struct mbuf *m; struct ifnet *ifp; struct mf6c *rt; { struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); mifi_t mifi, iif; struct mif6 *mifp; int plen = m->m_pkthdr.len; /* * Macro to send packet on mif. Since RSVP packets don't get counted on * input, they shouldn't get counted on output, so statistics keeping is * separate. */ #define MC6_SEND(ip6, mifp, m) do { \ if ((mifp)->m6_flags & MIFF_REGISTER) \ register_send((ip6), (mifp), (m)); \ else \ phyint_send((ip6), (mifp), (m)); \ } while (0) /* * Don't forward if it didn't arrive from the parent mif * for its origin. */ mifi = rt->mf6c_parent; if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { /* came in the wrong interface */ #ifdef MRT6DEBUG if (mrt6debug & DEBUG_FORWARD) log(LOG_DEBUG, "wrong if: ifid %d mifi %d mififid %x\n", ifp->if_index, mifi, mif6table[mifi].m6_ifp->if_index); #endif mrt6stat.mrt6s_wrong_if++; rt->mf6c_wrong_if++; /* * If we are doing PIM processing, and we are forwarding * packets on this interface, send a message to the * routing daemon. */ /* have to make sure this is a valid mif */ if (mifi < nummifs && mif6table[mifi].m6_ifp) if (pim6 && (m->m_flags & M_LOOP) == 0) { /* * Check the M_LOOP flag to avoid an * unnecessary PIM assert. * XXX: M_LOOP is an ad-hoc hack... */ static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; struct mbuf *mm; struct mrt6msg *im; #ifdef MRT6_OINIT struct omrt6msg *oim; #endif mm = m_copy(m, 0, sizeof(struct ip6_hdr)); if (mm && (M_READONLY(mm) || mm->m_len < sizeof(struct ip6_hdr))) mm = m_pullup(mm, sizeof(struct ip6_hdr)); if (mm == NULL) return ENOBUFS; #ifdef MRT6_OINIT oim = NULL; #endif im = NULL; switch (ip6_mrouter_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim = mtod(mm, struct omrt6msg *); oim->im6_msgtype = MRT6MSG_WRONGMIF; oim->im6_mbz = 0; break; #endif case MRT6_INIT: im = mtod(mm, struct mrt6msg *); im->im6_msgtype = MRT6MSG_WRONGMIF; im->im6_mbz = 0; break; default: m_freem(mm); return EINVAL; } for (mifp = mif6table, iif = 0; iif < nummifs && mifp && mifp->m6_ifp != ifp; mifp++, iif++) ; switch (ip6_mrouter_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim->im6_mif = iif; sin6.sin6_addr = oim->im6_src; break; #endif case MRT6_INIT: im->im6_mif = iif; sin6.sin6_addr = im->im6_src; break; } mrt6stat.mrt6s_upcalls++; if (socket_send(ip6_mrouter, mm, &sin6) < 0) { #ifdef MRT6DEBUG if (mrt6debug) log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); #endif ++mrt6stat.mrt6s_upq_sockfull; return ENOBUFS; } /* if socket Q full */ } /* if PIM */ return 0; } /* if wrong iif */ /* If I sourced this packet, it counts as output, else it was input. */ if (m->m_pkthdr.rcvif == NULL) { /* XXX: is rcvif really NULL when output?? */ mif6table[mifi].m6_pkt_out++; mif6table[mifi].m6_bytes_out += plen; } else { mif6table[mifi].m6_pkt_in++; mif6table[mifi].m6_bytes_in += plen; } rt->mf6c_pkt_cnt++; rt->mf6c_byte_cnt += plen; /* * For each mif, forward a copy of the packet if there are group * members downstream on the interface. */ for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) if (IF_ISSET(mifi, &rt->mf6c_ifset)) { /* * check if the outgoing packet is going to break * a scope boundary. * XXX For packets through PIM register tunnel * interface, we believe a routing daemon. */ if ((mif6table[rt->mf6c_parent].m6_flags & MIFF_REGISTER) == 0 && (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 && (in6_addr2scopeid(ifp, &ip6->ip6_dst) != in6_addr2scopeid(mif6table[mifi].m6_ifp, &ip6->ip6_dst) || in6_addr2scopeid(ifp, &ip6->ip6_src) != in6_addr2scopeid(mif6table[mifi].m6_ifp, &ip6->ip6_src))) { ip6stat.ip6s_badscope++; continue; } mifp->m6_pkt_out++; mifp->m6_bytes_out += plen; MC6_SEND(ip6, mifp, m); } return 0; } static void phyint_send(ip6, mifp, m) struct ip6_hdr *ip6; struct mif6 *mifp; struct mbuf *m; { struct mbuf *mb_copy; struct ifnet *ifp = mifp->m6_ifp; int error = 0; int s = splsoftnet(); static struct route_in6 ro; struct in6_multi *in6m; struct sockaddr_in6 *dst6; u_long linkmtu; /* * Make a new reference to the packet; make sure that * the IPv6 header is actually copied, not just referenced, * so that ip6_output() only scribbles on the copy. */ mb_copy = m_copy(m, 0, M_COPYALL); if (mb_copy && (M_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); if (mb_copy == NULL) { splx(s); return; } /* set MCAST flag to the outgoing packet */ mb_copy->m_flags |= M_MCAST; /* * If we sourced the packet, call ip6_output since we may devide * the packet into fragments when the packet is too big for the * outgoing interface. * Otherwise, we can simply send the packet to the interface * sending queue. */ if (m->m_pkthdr.rcvif == NULL) { struct ip6_moptions im6o; im6o.im6o_multicast_ifp = ifp; /* XXX: ip6_output will override ip6->ip6_hlim */ im6o.im6o_multicast_hlim = ip6->ip6_hlim; im6o.im6o_multicast_loop = 1; error = ip6_output(mb_copy, NULL, &ro, IPV6_FORWARDING, &im6o, NULL); #ifdef MRT6DEBUG if (mrt6debug & DEBUG_XMIT) log(LOG_DEBUG, "phyint_send on mif %d err %d\n", mifp - mif6table, error); #endif splx(s); return; } /* * If we belong to the destination multicast group * on the outgoing interface, loop back a copy. */ dst6 = (struct sockaddr_in6 *)&ro.ro_dst; IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); if (in6m != NULL) { dst6->sin6_len = sizeof(struct sockaddr_in6); dst6->sin6_family = AF_INET6; dst6->sin6_addr = ip6->ip6_dst; ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst); } /* * Put the packet into the sending queue of the outgoing interface * if it would fit in the MTU of the interface. */ linkmtu = IN6_LINKMTU(ifp); if (mb_copy->m_pkthdr.len < linkmtu || linkmtu < IPV6_MMTU) { dst6->sin6_len = sizeof(struct sockaddr_in6); dst6->sin6_family = AF_INET6; dst6->sin6_addr = ip6->ip6_dst; /* * We just call if_output instead of nd6_output here, since * we need no ND for a multicast forwarded packet...right? */ error = (*ifp->if_output)(ifp, mb_copy, (struct sockaddr *)&ro.ro_dst, NULL); #ifdef MRT6DEBUG if (mrt6debug & DEBUG_XMIT) log(LOG_DEBUG, "phyint_send on mif %d err %d\n", mifp - mif6table, error); #endif } else { #ifdef MULTICAST_PMTUD icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); #else #ifdef MRT6DEBUG if (mrt6debug & DEBUG_XMIT) log(LOG_DEBUG, "phyint_send: packet too big on %s o %s g %s" " size %d(discarded)\n", ifp->if_xname, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), mb_copy->m_pkthdr.len); #endif /* MRT6DEBUG */ m_freem(mb_copy); /* simply discard the packet */ #endif } splx(s); } static int register_send(ip6, mif, m) struct ip6_hdr *ip6; struct mif6 *mif; struct mbuf *m; { struct mbuf *mm; int i, len = m->m_pkthdr.len; static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; struct mrt6msg *im6; #ifdef MRT6DEBUG if (mrt6debug) log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst)); #endif ++pim6stat.pim6s_snd_registers; /* Make a copy of the packet to send to the user level process */ MGETHDR(mm, M_DONTWAIT, MT_HEADER); if (mm == NULL) return ENOBUFS; mm->m_data += max_linkhdr; mm->m_len = sizeof(struct ip6_hdr); if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { m_freem(mm); return ENOBUFS; } i = MHLEN - M_LEADINGSPACE(mm); if (i > len) i = len; mm = m_pullup(mm, i); if (mm == NULL) return ENOBUFS; /* TODO: check it! */ mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); /* * Send message to routing daemon */ sin6.sin6_addr = ip6->ip6_src; im6 = mtod(mm, struct mrt6msg *); im6->im6_msgtype = MRT6MSG_WHOLEPKT; im6->im6_mbz = 0; im6->im6_mif = mif - mif6table; /* iif info is not given for reg. encap.n */ mrt6stat.mrt6s_upcalls++; if (socket_send(ip6_mrouter, mm, &sin6) < 0) { #ifdef MRT6DEBUG if (mrt6debug) log(LOG_WARNING, "register_send: ip6_mrouter socket queue full\n"); #endif ++mrt6stat.mrt6s_upq_sockfull; return ENOBUFS; } return 0; } /* * PIM sparse mode hook * Receives the pim control messages, and passes them up to the listening * socket, using rip6_input. * The only message processed is the REGISTER pim message; the pim header * is stripped off, and the inner packet is passed to register_mforward. */ int pim6_input(mp, offp, proto) struct mbuf **mp; int *offp, proto; { struct pim *pim; /* pointer to a pim struct */ struct ip6_hdr *ip6; int pimlen; struct mbuf *m = *mp; int minlen; int off = *offp; ++pim6stat.pim6s_rcv_total; ip6 = mtod(m, struct ip6_hdr *); pimlen = m->m_pkthdr.len - *offp; /* * Validate lengths */ if (pimlen < PIM_MINLEN) { ++pim6stat.pim6s_rcv_tooshort; #ifdef MRT6DEBUG if (mrt6debug & DEBUG_PIM) log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); #endif m_freem(m); return(IPPROTO_DONE); } /* * if the packet is at least as big as a REGISTER, go ahead * and grab the PIM REGISTER header size, to avoid another * possible m_pullup() later. * * PIM_MINLEN == pimhdr + u_int32 == 8 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 */ minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; /* * Make sure that the IP6 and PIM headers in contiguous memory, and * possibly the PIM REGISTER header */ #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); /* adjust pointer */ ip6 = mtod(m, struct ip6_hdr *); /* adjust mbuf to point to the PIM header */ pim = (struct pim *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); if (pim == NULL) { pim6stat.pim6s_rcv_tooshort++; return IPPROTO_DONE; } #endif #define PIM6_CHECKSUM #ifdef PIM6_CHECKSUM { int cksumlen; /* * Validate checksum. * If PIM REGISTER, exclude the data packet */ if (pim->pim_type == PIM_REGISTER) cksumlen = PIM_MINLEN; else cksumlen = pimlen; if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { ++pim6stat.pim6s_rcv_badsum; #ifdef MRT6DEBUG if (mrt6debug & DEBUG_PIM) log(LOG_DEBUG, "pim6_input: invalid checksum\n"); #endif m_freem(m); return(IPPROTO_DONE); } } #endif /* PIM_CHECKSUM */ /* PIM version check */ if (pim->pim_ver != PIM_VERSION) { ++pim6stat.pim6s_rcv_badversion; #ifdef MRT6DEBUG log(LOG_ERR, "pim6_input: incorrect version %d, expecting %d\n", pim->pim_ver, PIM_VERSION); #endif m_freem(m); return(IPPROTO_DONE); } if (pim->pim_type == PIM_REGISTER) { /* * since this is a REGISTER, we'll make a copy of the register * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the * routing daemon. */ static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; struct mbuf *mcp; struct ip6_hdr *eip6; u_int32_t *reghdr; int rc; ++pim6stat.pim6s_rcv_registers; if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { #ifdef MRT6DEBUG if (mrt6debug & DEBUG_PIM) log(LOG_DEBUG, "pim6_input: register mif not set: %d\n", reg_mif_num); #endif m_freem(m); return(IPPROTO_DONE); } reghdr = (u_int32_t *)(pim + 1); if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) goto pim6_input_to_daemon; /* * Validate length */ if (pimlen < PIM6_REG_MINLEN) { ++pim6stat.pim6s_rcv_tooshort; ++pim6stat.pim6s_rcv_badregisters; #ifdef MRT6DEBUG log(LOG_ERR, "pim6_input: register packet size too " "small %d from %s\n", pimlen, ip6_sprintf(&ip6->ip6_src)); #endif m_freem(m); return(IPPROTO_DONE); } eip6 = (struct ip6_hdr *) (reghdr + 1); #ifdef MRT6DEBUG if (mrt6debug & DEBUG_PIM) log(LOG_DEBUG, "pim6_input[register], eip6: %s -> %s, " "eip6 plen %d\n", ip6_sprintf(&eip6->ip6_src), ip6_sprintf(&eip6->ip6_dst), ntohs(eip6->ip6_plen)); #endif /* verify the version number of the inner packet */ if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { ++pim6stat.pim6s_rcv_badregisters; #ifdef MRT6DEBUG log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " "of the inner packet\n", (eip6->ip6_vfc & IPV6_VERSION)); #endif m_freem(m); return(IPPROTO_NONE); } /* verify the inner packet is destined to a mcast group */ if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { ++pim6stat.pim6s_rcv_badregisters; #ifdef MRT6DEBUG if (mrt6debug & DEBUG_PIM) log(LOG_DEBUG, "pim6_input: inner packet of register " "is not multicast %s\n", ip6_sprintf(&eip6->ip6_dst)); #endif m_freem(m); return(IPPROTO_DONE); } /* * make a copy of the whole header to pass to the daemon later. */ mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); if (mcp == NULL) { #ifdef MRT6DEBUG log(LOG_ERR, "pim6_input: pim register: " "could not copy register head\n"); #endif m_freem(m); return(IPPROTO_DONE); } /* * forward the inner ip6 packet; point m_data at the inner ip6. */ m_adj(m, off + PIM_MINLEN); #ifdef MRT6DEBUG if (mrt6debug & DEBUG_PIM) { log(LOG_DEBUG, "pim6_input: forwarding decapsulated register: " "src %s, dst %s, mif %d\n", ip6_sprintf(&eip6->ip6_src), ip6_sprintf(&eip6->ip6_dst), reg_mif_num); } #endif rc = looutput(mif6table[reg_mif_num].m6_ifp, m, (struct sockaddr *) &dst, (struct rtentry *) NULL); /* prepare the register head to send to the mrouting daemon */ m = mcp; } /* * Pass the PIM message up to the daemon; if it is a register message * pass the 'head' only up to the daemon. This includes the * encapsulator ip6 header, pim header, register header and the * encapsulated ip6 header. */ pim6_input_to_daemon: rip6_input(&m, offp, proto); return(IPPROTO_DONE); }