1 /* $FreeBSD: src/sys/netinet6/ip6_mroute.c,v 1.2.2.9 2003/01/23 21:06:47 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/ip6_mroute.c,v 1.9 2005/06/03 19:56:08 eirikn Exp $ */
3 /* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ */
6 * Copyright (C) 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */
37 * IP multicast forwarding procedures
39 * Written by David Waitzman, BBN Labs, August 1988.
40 * Modified by Steve Deering, Stanford, February 1989.
41 * Modified by Mark J. Steiglitz, Stanford, May, 1991
42 * Modified by Van Jacobson, LBL, January 1993
43 * Modified by Ajit Thyagarajan, PARC, August 1993
44 * Modified by Bill Fenenr, PARC, April 1994
46 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
50 #include "opt_inet6.h"
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/callout.h>
55 #include <sys/malloc.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sockio.h>
60 #include <sys/protosw.h>
61 #include <sys/errno.h>
63 #include <sys/kernel.h>
64 #include <sys/syslog.h>
65 #include <sys/thread2.h>
68 #include <net/route.h>
69 #include <net/raw_cb.h>
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
74 #include <netinet/ip6.h>
75 #include <netinet6/ip6_var.h>
76 #include <netinet6/ip6_mroute.h>
77 #include <netinet6/pim6.h>
78 #include <netinet6/pim6_var.h>
80 #include <net/net_osdep.h>
82 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry");
84 #define M_HASCL(m) ((m)->m_flags & M_EXT)
86 static int ip6_mdq (struct mbuf *, struct ifnet *, struct mf6c *);
87 static void phyint_send (struct ip6_hdr *, struct mif6 *, struct mbuf *);
89 static int set_pim6 (int *);
90 static int socket_send (struct socket *, struct mbuf *,
91 struct sockaddr_in6 *);
92 static int register_send (struct ip6_hdr *, struct mif6 *,
96 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,
97 * except for netstat or debugging purposes.
99 struct socket *ip6_mrouter = NULL;
100 int ip6_mrouter_ver = 0;
101 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */
102 struct mrt6stat mrt6stat;
104 #define NO_RTE_FOUND 0x1
105 #define RTE_FOUND 0x2
107 struct mf6c *mf6ctable[MF6CTBLSIZ];
108 u_char n6expire[MF6CTBLSIZ];
109 static struct mif6 mif6table[MAXMIFS];
111 u_int mrt6debug = 0; /* debug level */
112 #define DEBUG_MFC 0x02
113 #define DEBUG_FORWARD 0x04
114 #define DEBUG_EXPIRE 0x08
115 #define DEBUG_XMIT 0x10
116 #define DEBUG_REG 0x20
117 #define DEBUG_PIM 0x40
120 static void expire_upcalls (void *);
121 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
122 #define UPCALL_EXPIRE 6 /* number of timeouts */
126 extern struct socket *ip_mrouter;
131 * 'Interfaces' associated with decapsulator (so we can tell
132 * packets that went through it from ones that get reflected
133 * by a broken gateway). These interfaces are never linked into
134 * the system ifnet list & no routes point to them. I.e., packets
135 * can't be sent this way. They only exist as a placeholder for
136 * multicast source verification.
138 struct ifnet multicast_register_if;
140 #define ENCAP_HOPS 64
145 static mifi_t nummifs = 0;
146 static mifi_t reg_mif_num = (mifi_t)-1;
148 static struct pim6stat pim6stat;
152 * Hash function for a source, group entry
154 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
155 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
156 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
157 (g).s6_addr32[2] ^ (g).s6_addr32[3])
160 * Find a route for a given origin IPv6 address and Multicast group address.
161 * Quality of service parameter to be added in the future!!!
164 #define MF6CFIND(o, g, rt) do { \
165 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
167 mrt6stat.mrt6s_mfc_lookups++; \
169 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
170 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
171 (_rt->mf6c_stall == NULL)) { \
175 _rt = _rt->mf6c_next; \
178 mrt6stat.mrt6s_mfc_misses++; \
183 * Macros to compute elapsed time efficiently
184 * Borrowed from Van Jacobson's scheduling code
186 #define TV_DELTA(a, b, delta) do { \
189 delta = (a).tv_usec - (b).tv_usec; \
190 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
199 delta += (1000000 * xxs); \
204 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
205 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
208 #define UPCALL_MAX 50
209 u_long upcall_data[UPCALL_MAX + 1];
210 static void collate();
211 #endif /* UPCALL_TIMING */
213 static int get_sg_cnt (struct sioc_sg_req6 *);
214 static int get_mif6_cnt (struct sioc_mif_req6 *);
215 static int ip6_mrouter_init (struct socket *, struct mbuf *, int);
216 static int add_m6if (struct mif6ctl *);
217 static int del_m6if (mifi_t *);
218 static int add_m6fc (struct mf6cctl *);
219 static int del_m6fc (struct mf6cctl *);
221 static struct callout expire_upcalls_ch;
224 * Handle MRT setsockopt commands to modify the multicast routing tables.
227 ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
232 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
235 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
237 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
240 switch (sopt->sopt_name) {
245 error = ip6_mrouter_init(so, m, sopt->sopt_name);
248 error = ip6_mrouter_done();
251 error = add_m6if(mtod(m, struct mif6ctl *));
254 error = del_m6if(mtod(m, mifi_t *));
257 error = add_m6fc(mtod(m, struct mf6cctl *));
260 error = del_m6fc(mtod(m, struct mf6cctl *));
263 error = set_pim6(mtod(m, int *));
275 * Handle MRT getsockopt commands
278 ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
282 if (so != ip6_mrouter) return EACCES;
284 switch (sopt->sopt_name) {
286 error = sooptcopyout(sopt, &pim6, sizeof(pim6));
293 * Handle ioctl commands to obtain information from the cache
296 mrt6_ioctl(int cmd, caddr_t data)
301 case SIOCGETSGCNT_IN6:
302 return(get_sg_cnt((struct sioc_sg_req6 *)data));
303 break; /* for safety */
304 case SIOCGETMIFCNT_IN6:
305 return(get_mif6_cnt((struct sioc_mif_req6 *)data));
306 break; /* for safety */
315 * returns the packet, byte, rpf-failure count for the source group provided
318 get_sg_cnt(struct sioc_sg_req6 *req)
323 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
326 req->pktcnt = rt->mf6c_pkt_cnt;
327 req->bytecnt = rt->mf6c_byte_cnt;
328 req->wrong_if = rt->mf6c_wrong_if;
332 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
339 * returns the input and output packet and byte counts on the mif provided
342 get_mif6_cnt(struct sioc_mif_req6 *req)
344 mifi_t mifi = req->mifi;
349 req->icount = mif6table[mifi].m6_pkt_in;
350 req->ocount = mif6table[mifi].m6_pkt_out;
351 req->ibytes = mif6table[mifi].m6_bytes_in;
352 req->obytes = mif6table[mifi].m6_bytes_out;
360 if ((*i != 1) && (*i != 0))
369 * Enable multicast routing
372 ip6_mrouter_init(struct socket *so, struct mbuf *m, int cmd)
379 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
380 so->so_type, so->so_proto->pr_protocol);
383 if (so->so_type != SOCK_RAW ||
384 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
387 if (!m || (m->m_len != sizeof(int *)))
394 if (ip6_mrouter != NULL) return EADDRINUSE;
397 ip6_mrouter_ver = cmd;
399 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
400 bzero((caddr_t)n6expire, sizeof(n6expire));
402 pim6 = 0;/* used for stubbing out/in pim stuff */
404 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
405 expire_upcalls, NULL);
409 log(LOG_DEBUG, "ip6_mrouter_init\n");
416 * Disable multicast routing
419 ip6_mrouter_done(void)
424 struct in6_ifreq ifr;
431 * For each phyint in use, disable promiscuous reception of all IPv6
437 * If there is still IPv4 multicast routing daemon,
438 * we remain interfaces to receive all muliticasted packets.
439 * XXX: there may be an interface in which the IPv4 multicast
440 * daemon is not interested...
446 for (mifi = 0; mifi < nummifs; mifi++) {
447 if (mif6table[mifi].m6_ifp &&
448 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
449 ifr.ifr_addr.sin6_family = AF_INET6;
450 ifr.ifr_addr.sin6_addr= in6addr_any;
451 ifp = mif6table[mifi].m6_ifp;
452 (*ifp->if_ioctl)(ifp, SIOCDELMULTI,
454 (struct ucred *)NULL);
459 bzero((caddr_t)qtable, sizeof(qtable));
460 bzero((caddr_t)tbftable, sizeof(tbftable));
462 bzero((caddr_t)mif6table, sizeof(mif6table));
465 pim6 = 0; /* used to stub out/in pim specific code */
467 callout_stop(&expire_upcalls_ch);
470 * Free all multicast forwarding cache entries.
472 for (i = 0; i < MF6CTBLSIZ; i++) {
477 for (rte = rt->mf6c_stall; rte != NULL; ) {
478 struct rtdetq *n = rte->next;
481 free(rte, M_MRTABLE);
486 free(frt, M_MRTABLE);
490 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
493 * Reset de-encapsulation cache
504 log(LOG_DEBUG, "ip6_mrouter_done\n");
510 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
513 * Add a mif to the mif table
516 add_m6if(struct mif6ctl *mifcp)
522 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
525 if (mifcp->mif6c_mifi >= MAXMIFS)
527 mifp = mif6table + mifcp->mif6c_mifi;
529 return EADDRINUSE; /* XXX: is it appropriate? */
530 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
532 ifp = ifindex2ifnet[mifcp->mif6c_pifi];
534 if (mifcp->mif6c_flags & MIFF_REGISTER) {
535 if (reg_mif_num == (mifi_t)-1) {
536 strlcpy(multicast_register_if.if_xname, "register_mif",
538 multicast_register_if.if_flags |= IFF_LOOPBACK;
539 multicast_register_if.if_index = mifcp->mif6c_mifi;
540 reg_mif_num = mifcp->mif6c_mifi;
543 ifp = &multicast_register_if;
547 /* Make sure the interface supports multicast */
548 if ((ifp->if_flags & IFF_MULTICAST) == 0)
552 error = if_allmulti(ifp, 1);
559 mifp->m6_flags = mifcp->mif6c_flags;
562 /* scaling up here allows division by 1024 in critical code */
563 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
565 /* initialize per mif pkt counters */
567 mifp->m6_pkt_out = 0;
568 mifp->m6_bytes_in = 0;
569 mifp->m6_bytes_out = 0;
572 /* Adjust nummifs up if the mifi is higher than nummifs */
573 if (nummifs <= mifcp->mif6c_mifi)
574 nummifs = mifcp->mif6c_mifi + 1;
579 "add_mif #%d, phyint %s\n",
588 * Delete a mif from the mif table
591 del_m6if(mifi_t *mifip)
593 struct mif6 *mifp = mif6table + *mifip;
597 if (*mifip >= nummifs)
599 if (mifp->m6_ifp == NULL)
604 if (!(mifp->m6_flags & MIFF_REGISTER)) {
606 * XXX: what if there is yet IPv4 multicast daemon
607 * using the interface?
615 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
616 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
618 bzero((caddr_t)mifp, sizeof (*mifp));
620 /* Adjust nummifs down */
621 for (mifi = nummifs; mifi > 0; mifi--)
622 if (mif6table[mifi - 1].m6_ifp)
630 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
640 add_m6fc(struct mf6cctl *mfccp)
647 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
648 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
650 /* If an entry already exists, just update the fields */
653 if (mrt6debug & DEBUG_MFC)
655 "add_m6fc no upcall h %d o %s g %s p %x\n",
656 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
657 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
658 mfccp->mf6cc_parent);
662 rt->mf6c_parent = mfccp->mf6cc_parent;
663 rt->mf6c_ifset = mfccp->mf6cc_ifset;
669 * Find the entry for which the upcall was made and update
672 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
673 mfccp->mf6cc_mcastgrp.sin6_addr);
674 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
675 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
676 &mfccp->mf6cc_origin.sin6_addr) &&
677 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
678 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
679 (rt->mf6c_stall != NULL)) {
683 "add_m6fc: %s o %s g %s p %x dbx %p\n",
684 "multiple kernel entries",
685 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
686 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
687 mfccp->mf6cc_parent, rt->mf6c_stall);
690 if (mrt6debug & DEBUG_MFC)
692 "add_m6fc o %s g %s p %x dbg %x\n",
693 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
694 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
695 mfccp->mf6cc_parent, rt->mf6c_stall);
698 rt->mf6c_origin = mfccp->mf6cc_origin;
699 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
700 rt->mf6c_parent = mfccp->mf6cc_parent;
701 rt->mf6c_ifset = mfccp->mf6cc_ifset;
702 /* initialize pkt counters per src-grp */
703 rt->mf6c_pkt_cnt = 0;
704 rt->mf6c_byte_cnt = 0;
705 rt->mf6c_wrong_if = 0;
707 rt->mf6c_expire = 0; /* Don't clean this guy up */
710 /* free packets Qed at the end of this entry */
711 for (rte = rt->mf6c_stall; rte != NULL; ) {
712 struct rtdetq *n = rte->next;
713 ip6_mdq(rte->m, rte->ifp, rt);
717 #endif /* UPCALL_TIMING */
718 free(rte, M_MRTABLE);
721 rt->mf6c_stall = NULL;
726 * It is possible that an entry is being inserted without an upcall
730 if (mrt6debug & DEBUG_MFC)
731 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n",
733 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
734 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
735 mfccp->mf6cc_parent);
738 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
740 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
741 &mfccp->mf6cc_origin.sin6_addr)&&
742 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
743 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
745 rt->mf6c_origin = mfccp->mf6cc_origin;
746 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
747 rt->mf6c_parent = mfccp->mf6cc_parent;
748 rt->mf6c_ifset = mfccp->mf6cc_ifset;
749 /* initialize pkt counters per src-grp */
750 rt->mf6c_pkt_cnt = 0;
751 rt->mf6c_byte_cnt = 0;
752 rt->mf6c_wrong_if = 0;
760 /* no upcall, so make a new entry */
761 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
768 /* insert new entry at head of hash chain */
769 rt->mf6c_origin = mfccp->mf6cc_origin;
770 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
771 rt->mf6c_parent = mfccp->mf6cc_parent;
772 rt->mf6c_ifset = mfccp->mf6cc_ifset;
773 /* initialize pkt counters per src-grp */
774 rt->mf6c_pkt_cnt = 0;
775 rt->mf6c_byte_cnt = 0;
776 rt->mf6c_wrong_if = 0;
778 rt->mf6c_stall = NULL;
780 /* link into table */
781 rt->mf6c_next = mf6ctable[hash];
782 mf6ctable[hash] = rt;
791 * collect delay statistics on the upcalls
794 collate(struct timeval *t)
804 TV_DELTA(tp, *t, delta);
813 #endif /* UPCALL_TIMING */
816 * Delete an mfc entry
819 del_m6fc(struct mf6cctl *mfccp)
821 struct sockaddr_in6 origin;
822 struct sockaddr_in6 mcastgrp;
827 origin = mfccp->mf6cc_origin;
828 mcastgrp = mfccp->mf6cc_mcastgrp;
829 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
832 if (mrt6debug & DEBUG_MFC)
833 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
834 ip6_sprintf(&origin.sin6_addr),
835 ip6_sprintf(&mcastgrp.sin6_addr));
840 nptr = &mf6ctable[hash];
841 while ((rt = *nptr) != NULL) {
842 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
843 &rt->mf6c_origin.sin6_addr) &&
844 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
845 &rt->mf6c_mcastgrp.sin6_addr) &&
846 rt->mf6c_stall == NULL)
849 nptr = &rt->mf6c_next;
853 return EADDRNOTAVAIL;
856 *nptr = rt->mf6c_next;
865 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
868 if (sbappendaddr(&s->so_rcv,
869 (struct sockaddr *)src,
870 mm, (struct mbuf *)0) != 0) {
880 * IPv6 multicast forwarding function. This function assumes that the packet
881 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
882 * pointed to by "ifp", and the packet is to be relayed to other networks
883 * that have members of the packet's destination IPv6 multicast group.
885 * The packet is returned unscathed to the caller, unless it is
886 * erroneous, in which case a non-zero return value tells the caller to
891 ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
899 if (mrt6debug & DEBUG_FORWARD)
900 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
901 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
906 * Don't forward a packet with Hop limit of zero or one,
907 * or a packet destined to a local-only group.
909 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) ||
910 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
915 * Source address check: do not forward packets with unspecified
916 * source. It was discussed in July 2000, on ipngwg mailing list.
917 * This is rather more serious than unicast cases, because some
918 * MLD packets can be sent with the unspecified source address
919 * (although such packets must normally set 1 to the hop limit field).
921 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
922 ip6stat.ip6s_cantforward++;
923 if (ip6_log_time + ip6_log_interval < time_second) {
924 ip6_log_time = time_second;
927 "from %s to %s nxt %d received on %s\n",
928 ip6_sprintf(&ip6->ip6_src),
929 ip6_sprintf(&ip6->ip6_dst),
931 if_name(m->m_pkthdr.rcvif));
937 * Determine forwarding mifs from the forwarding cache table
940 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
942 /* Entry exists, so forward if necessary */
945 return (ip6_mdq(m, ifp, rt));
948 * If we don't have a route for packet's origin,
949 * Make a copy of the packet &
950 * send message to routing daemon
961 #endif /* UPCALL_TIMING */
963 mrt6stat.mrt6s_no_route++;
965 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
966 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
967 ip6_sprintf(&ip6->ip6_src),
968 ip6_sprintf(&ip6->ip6_dst));
972 * Allocate mbufs early so that we don't do extra work if we
973 * are just going to fail anyway.
975 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE,
981 mb0 = m_copy(m, 0, M_COPYALL);
983 * Pullup packet header if needed before storing it,
984 * as other references may modify it in the meantime.
987 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
988 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
990 free(rte, M_MRTABLE);
995 /* is there an upcall waiting for this packet? */
996 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
997 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
998 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
999 &rt->mf6c_origin.sin6_addr) &&
1000 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1001 &rt->mf6c_mcastgrp.sin6_addr) &&
1002 (rt->mf6c_stall != NULL))
1009 struct omrt6msg *oim;
1012 /* no upcall, so make a new entry */
1013 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
1016 free(rte, M_MRTABLE);
1022 * Make a copy of the header to send to the user
1025 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1028 free(rte, M_MRTABLE);
1030 free(rt, M_MRTABLE);
1036 * Send message to routing daemon
1038 sin6.sin6_addr = ip6->ip6_src;
1044 switch (ip6_mrouter_ver) {
1047 oim = mtod(mm, struct omrt6msg *);
1048 oim->im6_msgtype = MRT6MSG_NOCACHE;
1053 im = mtod(mm, struct mrt6msg *);
1054 im->im6_msgtype = MRT6MSG_NOCACHE;
1058 free(rte, M_MRTABLE);
1060 free(rt, M_MRTABLE);
1066 if (mrt6debug & DEBUG_FORWARD)
1068 "getting the iif info in the kernel\n");
1071 for (mifp = mif6table, mifi = 0;
1072 mifi < nummifs && mifp->m6_ifp != ifp;
1076 switch (ip6_mrouter_ver) {
1079 oim->im6_mif = mifi;
1087 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1088 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1089 "socket queue full\n");
1090 mrt6stat.mrt6s_upq_sockfull++;
1091 free(rte, M_MRTABLE);
1093 free(rt, M_MRTABLE);
1098 mrt6stat.mrt6s_upcalls++;
1100 /* insert new entry at head of hash chain */
1101 bzero(rt, sizeof(*rt));
1102 rt->mf6c_origin.sin6_family = AF_INET6;
1103 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1104 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1105 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1106 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1107 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1108 rt->mf6c_expire = UPCALL_EXPIRE;
1110 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1112 /* link into table */
1113 rt->mf6c_next = mf6ctable[hash];
1114 mf6ctable[hash] = rt;
1115 /* Add this entry to the end of the queue */
1116 rt->mf6c_stall = rte;
1118 /* determine if q has overflowed */
1122 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1123 if (++npkts > MAX_UPQ6) {
1124 mrt6stat.mrt6s_upq_ovflw++;
1125 free(rte, M_MRTABLE);
1131 /* Add this entry to the end of the queue */
1138 #ifdef UPCALL_TIMING
1140 #endif /* UPCALL_TIMING */
1149 * Clean up cache entries if upcalls are not serviced
1150 * Call from the Slow Timeout mechanism, every half second.
1153 expire_upcalls(void *unused)
1156 struct mf6c *mfc, **nptr;
1160 for (i = 0; i < MF6CTBLSIZ; i++) {
1161 if (n6expire[i] == 0)
1163 nptr = &mf6ctable[i];
1164 while ((mfc = *nptr) != NULL) {
1165 rte = mfc->mf6c_stall;
1167 * Skip real cache entries
1168 * Make sure it wasn't marked to not expire (shouldn't happen)
1172 mfc->mf6c_expire != 0 &&
1173 --mfc->mf6c_expire == 0) {
1175 if (mrt6debug & DEBUG_EXPIRE)
1176 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1177 ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
1178 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
1181 * drop all the packets
1182 * free the mbuf with the pkt, if, timing info
1185 struct rtdetq *n = rte->next;
1187 free(rte, M_MRTABLE);
1189 } while (rte != NULL);
1190 mrt6stat.mrt6s_cache_cleanups++;
1193 *nptr = mfc->mf6c_next;
1194 free(mfc, M_MRTABLE);
1196 nptr = &mfc->mf6c_next;
1201 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1202 expire_upcalls, NULL);
1206 * Packet forwarding routine once entry in the cache is made
1209 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1211 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1214 int plen = m->m_pkthdr.len;
1217 * Macro to send packet on mif. Since RSVP packets don't get counted on
1218 * input, they shouldn't get counted on output, so statistics keeping is
1222 #define MC6_SEND(ip6, mifp, m) do { \
1223 if ((mifp)->m6_flags & MIFF_REGISTER) \
1224 register_send((ip6), (mifp), (m)); \
1226 phyint_send((ip6), (mifp), (m)); \
1230 * Don't forward if it didn't arrive from the parent mif
1233 mifi = rt->mf6c_parent;
1234 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1235 /* came in the wrong interface */
1237 if (mrt6debug & DEBUG_FORWARD)
1239 "wrong if: ifid %d mifi %d mififid %x\n",
1240 ifp->if_index, mifi,
1241 mif6table[mifi].m6_ifp->if_index);
1243 mrt6stat.mrt6s_wrong_if++;
1244 rt->mf6c_wrong_if++;
1246 * If we are doing PIM processing, and we are forwarding
1247 * packets on this interface, send a message to the
1250 /* have to make sure this is a valid mif */
1251 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1252 if (pim6 && (m->m_flags & M_LOOP) == 0) {
1254 * Check the M_LOOP flag to avoid an
1255 * unnecessary PIM assert.
1256 * XXX: M_LOOP is an ad-hoc hack...
1258 static struct sockaddr_in6 sin6 =
1259 { sizeof(sin6), AF_INET6 };
1264 struct omrt6msg *oim;
1267 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1270 mm->m_len < sizeof(struct ip6_hdr)))
1271 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1279 switch (ip6_mrouter_ver) {
1282 oim = mtod(mm, struct omrt6msg *);
1283 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1288 im = mtod(mm, struct mrt6msg *);
1289 im->im6_msgtype = MRT6MSG_WRONGMIF;
1297 for (mifp = mif6table, iif = 0;
1298 iif < nummifs && mifp &&
1299 mifp->m6_ifp != ifp;
1303 switch (ip6_mrouter_ver) {
1307 sin6.sin6_addr = oim->im6_src;
1312 sin6.sin6_addr = im->im6_src;
1316 mrt6stat.mrt6s_upcalls++;
1318 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1321 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1323 ++mrt6stat.mrt6s_upq_sockfull;
1325 } /* if socket Q full */
1328 } /* if wrong iif */
1330 /* If I sourced this packet, it counts as output, else it was input. */
1331 if (m->m_pkthdr.rcvif == NULL) {
1332 /* XXX: is rcvif really NULL when output?? */
1333 mif6table[mifi].m6_pkt_out++;
1334 mif6table[mifi].m6_bytes_out += plen;
1336 mif6table[mifi].m6_pkt_in++;
1337 mif6table[mifi].m6_bytes_in += plen;
1340 rt->mf6c_byte_cnt += plen;
1343 * For each mif, forward a copy of the packet if there are group
1344 * members downstream on the interface.
1346 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++)
1347 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1349 * check if the outgoing packet is going to break
1351 * XXX For packets through PIM register tunnel
1352 * interface, we believe a routing daemon.
1354 if ((mif6table[rt->mf6c_parent].m6_flags &
1355 MIFF_REGISTER) == 0 &&
1356 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 &&
1357 (in6_addr2scopeid(ifp, &ip6->ip6_dst) !=
1358 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1360 in6_addr2scopeid(ifp, &ip6->ip6_src) !=
1361 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1363 ip6stat.ip6s_badscope++;
1368 mifp->m6_bytes_out += plen;
1369 MC6_SEND(ip6, mifp, m);
1375 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1377 struct mbuf *mb_copy;
1378 struct ifnet *ifp = mifp->m6_ifp;
1380 static struct route_in6 ro;
1381 struct in6_multi *in6m;
1382 struct sockaddr_in6 *dst6;
1384 crit_enter(); /* needs to protect static "ro" below. */
1387 * Make a new reference to the packet; make sure that
1388 * the IPv6 header is actually copied, not just referenced,
1389 * so that ip6_output() only scribbles on the copy.
1391 mb_copy = m_copy(m, 0, M_COPYALL);
1393 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1394 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1395 if (mb_copy == NULL) {
1399 /* set MCAST flag to the outgoing packet */
1400 mb_copy->m_flags |= M_MCAST;
1403 * If we sourced the packet, call ip6_output since we may devide
1404 * the packet into fragments when the packet is too big for the
1405 * outgoing interface.
1406 * Otherwise, we can simply send the packet to the interface
1409 if (m->m_pkthdr.rcvif == NULL) {
1410 struct ip6_moptions im6o;
1412 im6o.im6o_multicast_ifp = ifp;
1413 /* XXX: ip6_output will override ip6->ip6_hlim */
1414 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1415 im6o.im6o_multicast_loop = 1;
1416 error = ip6_output(mb_copy, NULL, &ro,
1417 IPV6_FORWARDING, &im6o, NULL, NULL);
1420 if (mrt6debug & DEBUG_XMIT)
1421 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1422 mifp - mif6table, error);
1429 * If we belong to the destination multicast group
1430 * on the outgoing interface, loop back a copy.
1432 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
1433 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1435 dst6->sin6_len = sizeof(struct sockaddr_in6);
1436 dst6->sin6_family = AF_INET6;
1437 dst6->sin6_addr = ip6->ip6_dst;
1438 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
1441 * Put the packet into the sending queue of the outgoing interface
1442 * if it would fit in the MTU of the interface.
1444 if (mb_copy->m_pkthdr.len <= ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) {
1445 dst6->sin6_len = sizeof(struct sockaddr_in6);
1446 dst6->sin6_family = AF_INET6;
1447 dst6->sin6_addr = ip6->ip6_dst;
1449 * We just call if_output instead of nd6_output here, since
1450 * we need no ND for a multicast forwarded packet...right?
1452 error = (*ifp->if_output)(ifp, mb_copy,
1453 (struct sockaddr *)&ro.ro_dst, NULL);
1455 if (mrt6debug & DEBUG_XMIT)
1456 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1457 mifp - mif6table, error);
1460 #ifdef MULTICAST_PMTUD
1461 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
1464 if (mrt6debug & DEBUG_XMIT)
1466 "phyint_send: packet too big on %s o %s g %s"
1467 " size %d(discarded)\n",
1469 ip6_sprintf(&ip6->ip6_src),
1470 ip6_sprintf(&ip6->ip6_dst),
1471 mb_copy->m_pkthdr.len);
1472 #endif /* MRT6DEBUG */
1473 m_freem(mb_copy); /* simply discard the packet */
1481 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1484 int i, len = m->m_pkthdr.len;
1485 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1486 struct mrt6msg *im6;
1490 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1491 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
1493 ++pim6stat.pim6s_snd_registers;
1495 /* Make a copy of the packet to send to the user level process */
1496 MGETHDR(mm, MB_DONTWAIT, MT_HEADER);
1499 mm->m_pkthdr.rcvif = NULL;
1500 mm->m_data += max_linkhdr;
1501 mm->m_len = sizeof(struct ip6_hdr);
1503 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1507 i = MHLEN - M_LEADINGSPACE(mm);
1510 mm = m_pullup(mm, i);
1513 /* TODO: check it! */
1514 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1517 * Send message to routing daemon
1519 sin6.sin6_addr = ip6->ip6_src;
1521 im6 = mtod(mm, struct mrt6msg *);
1522 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1525 im6->im6_mif = mif - mif6table;
1527 /* iif info is not given for reg. encap.n */
1528 mrt6stat.mrt6s_upcalls++;
1530 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1534 "register_send: ip6_mrouter socket queue full\n");
1536 ++mrt6stat.mrt6s_upq_sockfull;
1543 * PIM sparse mode hook
1544 * Receives the pim control messages, and passes them up to the listening
1545 * socket, using rip6_input.
1546 * The only message processed is the REGISTER pim message; the pim header
1547 * is stripped off, and the inner packet is passed to register_mforward.
1550 pim6_input(struct mbuf **mp, int *offp, int proto)
1552 struct pim *pim; /* pointer to a pim struct */
1553 struct ip6_hdr *ip6;
1555 struct mbuf *m = *mp;
1559 ++pim6stat.pim6s_rcv_total;
1561 ip6 = mtod(m, struct ip6_hdr *);
1562 pimlen = m->m_pkthdr.len - *offp;
1567 if (pimlen < PIM_MINLEN) {
1568 ++pim6stat.pim6s_rcv_tooshort;
1570 if (mrt6debug & DEBUG_PIM)
1571 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1574 return(IPPROTO_DONE);
1578 * if the packet is at least as big as a REGISTER, go ahead
1579 * and grab the PIM REGISTER header size, to avoid another
1580 * possible m_pullup() later.
1582 * PIM_MINLEN == pimhdr + u_int32 == 8
1583 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1585 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1588 * Make sure that the IP6 and PIM headers in contiguous memory, and
1589 * possibly the PIM REGISTER header
1591 #ifndef PULLDOWN_TEST
1592 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1593 /* adjust pointer */
1594 ip6 = mtod(m, struct ip6_hdr *);
1596 /* adjust mbuf to point to the PIM header */
1597 pim = (struct pim *)((caddr_t)ip6 + off);
1599 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1601 pim6stat.pim6s_rcv_tooshort++;
1602 return IPPROTO_DONE;
1606 #define PIM6_CHECKSUM
1607 #ifdef PIM6_CHECKSUM
1612 * Validate checksum.
1613 * If PIM REGISTER, exclude the data packet
1615 if (pim->pim_type == PIM_REGISTER)
1616 cksumlen = PIM_MINLEN;
1620 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1621 ++pim6stat.pim6s_rcv_badsum;
1623 if (mrt6debug & DEBUG_PIM)
1625 "pim6_input: invalid checksum\n");
1628 return(IPPROTO_DONE);
1631 #endif /* PIM_CHECKSUM */
1633 /* PIM version check */
1634 if (pim->pim_ver != PIM_VERSION) {
1635 ++pim6stat.pim6s_rcv_badversion;
1638 "pim6_input: incorrect version %d, expecting %d\n",
1639 pim->pim_ver, PIM_VERSION);
1642 return(IPPROTO_DONE);
1645 if (pim->pim_type == PIM_REGISTER) {
1647 * since this is a REGISTER, we'll make a copy of the register
1648 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1651 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1654 struct ip6_hdr *eip6;
1658 ++pim6stat.pim6s_rcv_registers;
1660 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1662 if (mrt6debug & DEBUG_PIM)
1664 "pim6_input: register mif not set: %d\n",
1668 return(IPPROTO_DONE);
1671 reghdr = (u_int32_t *)(pim + 1);
1673 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1674 goto pim6_input_to_daemon;
1679 if (pimlen < PIM6_REG_MINLEN) {
1680 ++pim6stat.pim6s_rcv_tooshort;
1681 ++pim6stat.pim6s_rcv_badregisters;
1684 "pim6_input: register packet size too "
1685 "small %d from %s\n",
1686 pimlen, ip6_sprintf(&ip6->ip6_src));
1689 return(IPPROTO_DONE);
1692 eip6 = (struct ip6_hdr *) (reghdr + 1);
1694 if (mrt6debug & DEBUG_PIM)
1696 "pim6_input[register], eip6: %s -> %s, "
1698 ip6_sprintf(&eip6->ip6_src),
1699 ip6_sprintf(&eip6->ip6_dst),
1700 ntohs(eip6->ip6_plen));
1703 /* verify the version number of the inner packet */
1704 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1705 ++pim6stat.pim6s_rcv_badregisters;
1707 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1708 "of the inner packet\n",
1709 (eip6->ip6_vfc & IPV6_VERSION));
1712 return(IPPROTO_NONE);
1715 /* verify the inner packet is destined to a mcast group */
1716 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1717 ++pim6stat.pim6s_rcv_badregisters;
1719 if (mrt6debug & DEBUG_PIM)
1721 "pim6_input: inner packet of register "
1722 "is not multicast %s\n",
1723 ip6_sprintf(&eip6->ip6_dst));
1726 return(IPPROTO_DONE);
1730 * make a copy of the whole header to pass to the daemon later.
1732 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1736 "pim6_input: pim register: "
1737 "could not copy register head\n");
1740 return(IPPROTO_DONE);
1744 * forward the inner ip6 packet; point m_data at the inner ip6.
1746 m_adj(m, off + PIM_MINLEN);
1748 if (mrt6debug & DEBUG_PIM) {
1750 "pim6_input: forwarding decapsulated register: "
1751 "src %s, dst %s, mif %d\n",
1752 ip6_sprintf(&eip6->ip6_src),
1753 ip6_sprintf(&eip6->ip6_dst),
1758 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1759 dst.sin6_family, NULL);
1761 /* prepare the register head to send to the mrouting daemon */
1766 * Pass the PIM message up to the daemon; if it is a register message
1767 * pass the 'head' only up to the daemon. This includes the
1768 * encapsulator ip6 header, pim header, register header and the
1769 * encapsulated ip6 header.
1771 pim6_input_to_daemon:
1772 rip6_input(&m, offp, proto);
1773 return(IPPROTO_DONE);