2 * Copyright (C) 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
33 * Copyright (c) 1989 Stephen Deering
34 * Copyright (c) 1992, 1993
35 * The Regents of the University of California. All rights reserved.
37 * This code is derived from software contributed to Berkeley by
38 * Stephen Deering of Stanford University.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 4. Neither the name of the University nor the names of its contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
65 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
69 * IP multicast forwarding procedures
71 * Written by David Waitzman, BBN Labs, August 1988.
72 * Modified by Steve Deering, Stanford, February 1989.
73 * Modified by Mark J. Steiglitz, Stanford, May, 1991
74 * Modified by Van Jacobson, LBL, January 1993
75 * Modified by Ajit Thyagarajan, PARC, August 1993
76 * Modified by Bill Fenner, PARC, April 1994
78 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
81 #include <sys/cdefs.h>
82 __FBSDID("$FreeBSD$");
85 #include "opt_inet6.h"
87 #include <sys/param.h>
88 #include <sys/callout.h>
89 #include <sys/errno.h>
90 #include <sys/kernel.h>
92 #include <sys/malloc.h>
94 #include <sys/protosw.h>
95 #include <sys/signalvar.h>
96 #include <sys/socket.h>
97 #include <sys/socketvar.h>
98 #include <sys/sockio.h>
100 #include <sys/sysctl.h>
101 #include <sys/syslog.h>
102 #include <sys/systm.h>
103 #include <sys/time.h>
106 #include <net/if_types.h>
107 #include <net/raw_cb.h>
108 #include <net/route.h>
110 #include <netinet/in.h>
111 #include <netinet/in_var.h>
112 #include <netinet/icmp6.h>
114 #include <netinet/ip6.h>
115 #include <netinet6/ip6_var.h>
116 #include <netinet6/scope6_var.h>
117 #include <netinet6/nd6.h>
118 #include <netinet6/ip6_mroute.h>
119 #include <netinet6/ip6protosw.h>
120 #include <netinet6/pim6.h>
121 #include <netinet6/pim6_var.h>
123 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
125 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
126 #define M_HASCL(m) ((m)->m_flags & M_EXT)
128 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
129 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
131 static int set_pim6(int *);
132 static int socket_send __P((struct socket *, struct mbuf *,
133 struct sockaddr_in6 *));
134 static int register_send __P((struct ip6_hdr *, struct mif6 *,
137 extern struct domain inet6domain;
139 /* XXX: referenced from ip_mroute.c for dynamically loading this code. */
140 struct ip6protosw in6_pim_protosw = {
142 .pr_domain = &inet6domain,
143 .pr_protocol = IPPROTO_PIM,
144 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
145 .pr_input = pim6_input,
146 .pr_output = rip6_output,
147 .pr_ctloutput = rip6_ctloutput,
148 .pr_usrreqs = &rip6_usrreqs
151 static int ip6_mrouter_ver = 0;
153 SYSCTL_DECL(_net_inet6);
154 SYSCTL_DECL(_net_inet6_ip6);
155 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
157 static struct mrt6stat mrt6stat;
158 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
160 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
162 #define NO_RTE_FOUND 0x1
163 #define RTE_FOUND 0x2
165 static struct mf6c *mf6ctable[MF6CTBLSIZ];
166 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
167 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
168 "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
169 "netinet6/ip6_mroute.h)");
171 static u_char n6expire[MF6CTBLSIZ];
173 static struct mif6 mif6table[MAXMIFS];
174 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
175 &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]",
176 "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)");
179 static u_int mrt6debug = 0; /* debug level */
180 #define DEBUG_MFC 0x02
181 #define DEBUG_FORWARD 0x04
182 #define DEBUG_EXPIRE 0x08
183 #define DEBUG_XMIT 0x10
184 #define DEBUG_REG 0x20
185 #define DEBUG_PIM 0x40
188 static void expire_upcalls(void *);
189 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
190 #define UPCALL_EXPIRE 6 /* number of timeouts */
194 extern struct socket *ip_mrouter;
199 * 'Interfaces' associated with decapsulator (so we can tell
200 * packets that went through it from ones that get reflected
201 * by a broken gateway). Different from IPv4 register_if,
202 * these interfaces are linked into the system ifnet list,
203 * because per-interface IPv6 statistics are maintained in
204 * ifp->if_afdata. But it does not have any routes point
205 * to them. I.e., packets can't be sent this way. They
206 * only exist as a placeholder for multicast source
209 static struct ifnet *multicast_register_if6;
211 #define ENCAP_HOPS 64
216 static mifi_t nummifs = 0;
217 static mifi_t reg_mif_num = (mifi_t)-1;
219 static struct pim6stat pim6stat;
220 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
222 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
227 * Hash function for a source, group entry
229 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
230 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
231 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
232 (g).s6_addr32[2] ^ (g).s6_addr32[3])
235 * Find a route for a given origin IPv6 address and Multicast group address.
237 #define MF6CFIND(o, g, rt) do { \
238 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
240 mrt6stat.mrt6s_mfc_lookups++; \
242 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
243 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
244 (_rt->mf6c_stall == NULL)) { \
248 _rt = _rt->mf6c_next; \
251 mrt6stat.mrt6s_mfc_misses++; \
253 } while (/*CONSTCOND*/ 0)
256 * Macros to compute elapsed time efficiently
257 * Borrowed from Van Jacobson's scheduling code
258 * XXX: replace with timersub() ?
260 #define TV_DELTA(a, b, delta) do { \
263 delta = (a).tv_usec - (b).tv_usec; \
264 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
273 delta += (1000000 * xxs); \
276 } while (/*CONSTCOND*/ 0)
278 /* XXX: replace with timercmp(a, b, <) ? */
279 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
280 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
283 #define UPCALL_MAX 50
284 static u_long upcall_data[UPCALL_MAX + 1];
285 static void collate();
286 #endif /* UPCALL_TIMING */
288 static int get_sg_cnt(struct sioc_sg_req6 *);
289 static int get_mif6_cnt(struct sioc_mif_req6 *);
290 static int ip6_mrouter_init(struct socket *, int, int);
291 static int add_m6if(struct mif6ctl *);
292 static int del_m6if(mifi_t *);
293 static int add_m6fc(struct mf6cctl *);
294 static int del_m6fc(struct mf6cctl *);
296 static struct callout expire_upcalls_ch;
298 int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m);
299 int X_ip6_mrouter_done(void);
300 int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt);
301 int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt);
302 int X_mrt6_ioctl(int cmd, caddr_t data);
305 * Handle MRT setsockopt commands to modify the multicast routing tables.
308 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
316 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
319 switch (sopt->sopt_name) {
324 error = sooptcopyin(sopt, &optval, sizeof(optval),
328 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
331 error = X_ip6_mrouter_done();
334 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
337 error = add_m6if(&mifc);
340 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
343 error = add_m6fc(&mfcc);
346 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
349 error = del_m6fc(&mfcc);
352 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
355 error = del_m6if(&mifi);
358 error = sooptcopyin(sopt, &optval, sizeof(optval),
362 error = set_pim6(&optval);
373 * Handle MRT getsockopt commands
376 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
380 if (so != ip6_mrouter)
383 switch (sopt->sopt_name) {
385 error = sooptcopyout(sopt, &pim6, sizeof(pim6));
392 * Handle ioctl commands to obtain information from the cache
395 X_mrt6_ioctl(int cmd, caddr_t data)
398 case SIOCGETSGCNT_IN6:
399 return (get_sg_cnt((struct sioc_sg_req6 *)data));
400 case SIOCGETMIFCNT_IN6:
401 return (get_mif6_cnt((struct sioc_mif_req6 *)data));
408 * returns the packet, byte, rpf-failure count for the source group provided
411 get_sg_cnt(struct sioc_sg_req6 *req)
417 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
420 req->pktcnt = rt->mf6c_pkt_cnt;
421 req->bytecnt = rt->mf6c_byte_cnt;
422 req->wrong_if = rt->mf6c_wrong_if;
426 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
433 * returns the input and output packet and byte counts on the mif provided
436 get_mif6_cnt(struct sioc_mif_req6 *req)
438 mifi_t mifi = req->mifi;
443 req->icount = mif6table[mifi].m6_pkt_in;
444 req->ocount = mif6table[mifi].m6_pkt_out;
445 req->ibytes = mif6table[mifi].m6_bytes_in;
446 req->obytes = mif6table[mifi].m6_bytes_out;
454 if ((*i != 1) && (*i != 0))
463 * Enable multicast routing
466 ip6_mrouter_init(struct socket *so, int v, int cmd)
471 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
472 so->so_type, so->so_proto->pr_protocol);
475 if (so->so_type != SOCK_RAW ||
476 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
480 return (ENOPROTOOPT);
482 if (ip6_mrouter != NULL)
486 ip6_mrouter_ver = cmd;
488 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
489 bzero((caddr_t)n6expire, sizeof(n6expire));
491 pim6 = 0;/* used for stubbing out/in pim stuff */
493 callout_init(&expire_upcalls_ch, 0);
494 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
495 expire_upcalls, NULL);
499 log(LOG_DEBUG, "ip6_mrouter_init\n");
506 * Disable multicast routing
509 X_ip6_mrouter_done(void)
520 * For each phyint in use, disable promiscuous reception of all IPv6
526 * If there is still IPv4 multicast routing daemon,
527 * we remain interfaces to receive all muliticasted packets.
528 * XXX: there may be an interface in which the IPv4 multicast
529 * daemon is not interested...
535 for (mifi = 0; mifi < nummifs; mifi++) {
536 if (mif6table[mifi].m6_ifp &&
537 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
538 if_allmulti(mif6table[mifi].m6_ifp, 0);
542 bzero((caddr_t)mif6table, sizeof(mif6table));
545 pim6 = 0; /* used to stub out/in pim specific code */
547 callout_stop(&expire_upcalls_ch);
550 * Free all multicast forwarding cache entries.
552 for (i = 0; i < MF6CTBLSIZ; i++) {
557 for (rte = rt->mf6c_stall; rte != NULL; ) {
558 struct rtdetq *n = rte->next;
561 free(rte, M_MRTABLE6);
566 free(frt, M_MRTABLE6);
570 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
573 * Reset register interface
575 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
576 if_detach(multicast_register_if6);
577 if_free(multicast_register_if6);
578 reg_mif_num = (mifi_t)-1;
579 multicast_register_if6 = NULL;
589 log(LOG_DEBUG, "ip6_mrouter_done\n");
595 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
598 * Add a mif to the mif table
601 add_m6if(struct mif6ctl *mifcp)
607 if (mifcp->mif6c_mifi >= MAXMIFS)
609 mifp = mif6table + mifcp->mif6c_mifi;
611 return (EADDRINUSE); /* XXX: is it appropriate? */
612 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
614 ifp = ifnet_byindex(mifcp->mif6c_pifi);
616 if (mifcp->mif6c_flags & MIFF_REGISTER) {
617 if (reg_mif_num == (mifi_t)-1) {
618 ifp = if_alloc(IFT_OTHER);
620 if_initname(ifp, "register_mif", 0);
621 ifp->if_flags |= IFF_LOOPBACK;
623 multicast_register_if6 = ifp;
624 reg_mif_num = mifcp->mif6c_mifi;
626 * it is impossible to guess the ifindex of the
627 * register interface. So mif6c_pifi is automatically
630 mifcp->mif6c_pifi = ifp->if_index;
632 ifp = multicast_register_if6;
637 /* Make sure the interface supports multicast */
638 if ((ifp->if_flags & IFF_MULTICAST) == 0)
642 error = if_allmulti(ifp, 1);
649 mifp->m6_flags = mifcp->mif6c_flags;
652 /* initialize per mif pkt counters */
654 mifp->m6_pkt_out = 0;
655 mifp->m6_bytes_in = 0;
656 mifp->m6_bytes_out = 0;
659 /* Adjust nummifs up if the mifi is higher than nummifs */
660 if (nummifs <= mifcp->mif6c_mifi)
661 nummifs = mifcp->mif6c_mifi + 1;
666 "add_mif #%d, phyint %s\n",
675 * Delete a mif from the mif table
678 del_m6if(mifi_t *mifip)
680 struct mif6 *mifp = mif6table + *mifip;
685 if (*mifip >= nummifs)
687 if (mifp->m6_ifp == NULL)
692 if (!(mifp->m6_flags & MIFF_REGISTER)) {
694 * XXX: what if there is yet IPv4 multicast daemon
695 * using the interface?
701 if (reg_mif_num != (mifi_t)-1 &&
702 multicast_register_if6 != NULL) {
703 if_detach(multicast_register_if6);
704 if_free(multicast_register_if6);
705 reg_mif_num = (mifi_t)-1;
706 multicast_register_if6 = NULL;
710 bzero((caddr_t)mifp, sizeof(*mifp));
712 /* Adjust nummifs down */
713 for (mifi = nummifs; mifi > 0; mifi--)
714 if (mif6table[mifi - 1].m6_ifp)
722 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
732 add_m6fc(struct mf6cctl *mfccp)
739 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
741 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
742 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
744 /* If an entry already exists, just update the fields */
747 if (mrt6debug & DEBUG_MFC) {
749 "add_m6fc no upcall h %d o %s g %s p %x\n",
750 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
751 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
752 mfccp->mf6cc_parent);
757 rt->mf6c_parent = mfccp->mf6cc_parent;
758 rt->mf6c_ifset = mfccp->mf6cc_ifset;
764 * Find the entry for which the upcall was made and update
767 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
768 mfccp->mf6cc_mcastgrp.sin6_addr);
769 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
770 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
771 &mfccp->mf6cc_origin.sin6_addr) &&
772 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
773 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
774 (rt->mf6c_stall != NULL)) {
778 "add_m6fc: %s o %s g %s p %x dbx %p\n",
779 "multiple kernel entries",
781 &mfccp->mf6cc_origin.sin6_addr),
783 &mfccp->mf6cc_mcastgrp.sin6_addr),
784 mfccp->mf6cc_parent, rt->mf6c_stall);
787 if (mrt6debug & DEBUG_MFC)
789 "add_m6fc o %s g %s p %x dbg %x\n",
791 &mfccp->mf6cc_origin.sin6_addr),
793 &mfccp->mf6cc_mcastgrp.sin6_addr),
794 mfccp->mf6cc_parent, rt->mf6c_stall);
797 rt->mf6c_origin = mfccp->mf6cc_origin;
798 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
799 rt->mf6c_parent = mfccp->mf6cc_parent;
800 rt->mf6c_ifset = mfccp->mf6cc_ifset;
801 /* initialize pkt counters per src-grp */
802 rt->mf6c_pkt_cnt = 0;
803 rt->mf6c_byte_cnt = 0;
804 rt->mf6c_wrong_if = 0;
806 rt->mf6c_expire = 0; /* Don't clean this guy up */
809 /* free packets Qed at the end of this entry */
810 for (rte = rt->mf6c_stall; rte != NULL; ) {
811 struct rtdetq *n = rte->next;
812 ip6_mdq(rte->m, rte->ifp, rt);
816 #endif /* UPCALL_TIMING */
817 free(rte, M_MRTABLE6);
820 rt->mf6c_stall = NULL;
825 * It is possible that an entry is being inserted without an upcall
829 if (mrt6debug & DEBUG_MFC)
831 "add_mfc no upcall h %d o %s g %s p %x\n",
833 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
834 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
835 mfccp->mf6cc_parent);
838 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
840 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
841 &mfccp->mf6cc_origin.sin6_addr)&&
842 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
843 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
845 rt->mf6c_origin = mfccp->mf6cc_origin;
846 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
847 rt->mf6c_parent = mfccp->mf6cc_parent;
848 rt->mf6c_ifset = mfccp->mf6cc_ifset;
849 /* initialize pkt counters per src-grp */
850 rt->mf6c_pkt_cnt = 0;
851 rt->mf6c_byte_cnt = 0;
852 rt->mf6c_wrong_if = 0;
860 /* no upcall, so make a new entry */
861 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
868 /* insert new entry at head of hash chain */
869 rt->mf6c_origin = mfccp->mf6cc_origin;
870 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
871 rt->mf6c_parent = mfccp->mf6cc_parent;
872 rt->mf6c_ifset = mfccp->mf6cc_ifset;
873 /* initialize pkt counters per src-grp */
874 rt->mf6c_pkt_cnt = 0;
875 rt->mf6c_byte_cnt = 0;
876 rt->mf6c_wrong_if = 0;
878 rt->mf6c_stall = NULL;
880 /* link into table */
881 rt->mf6c_next = mf6ctable[hash];
882 mf6ctable[hash] = rt;
891 * collect delay statistics on the upcalls
894 collate(struct timeval *t)
904 TV_DELTA(tp, *t, delta);
913 #endif /* UPCALL_TIMING */
916 * Delete an mfc entry
919 del_m6fc(struct mf6cctl *mfccp)
921 struct sockaddr_in6 origin;
922 struct sockaddr_in6 mcastgrp;
928 origin = mfccp->mf6cc_origin;
929 mcastgrp = mfccp->mf6cc_mcastgrp;
930 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
933 if (mrt6debug & DEBUG_MFC) {
934 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
935 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
936 ip6_sprintf(ip6bufo, &origin.sin6_addr),
937 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
943 nptr = &mf6ctable[hash];
944 while ((rt = *nptr) != NULL) {
945 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
946 &rt->mf6c_origin.sin6_addr) &&
947 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
948 &rt->mf6c_mcastgrp.sin6_addr) &&
949 rt->mf6c_stall == NULL)
952 nptr = &rt->mf6c_next;
956 return (EADDRNOTAVAIL);
959 *nptr = rt->mf6c_next;
960 free(rt, M_MRTABLE6);
968 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
972 if (sbappendaddr(&s->so_rcv,
973 (struct sockaddr *)src,
974 mm, (struct mbuf *)0) != 0) {
984 * IPv6 multicast forwarding function. This function assumes that the packet
985 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
986 * pointed to by "ifp", and the packet is to be relayed to other networks
987 * that have members of the packet's destination IPv6 multicast group.
989 * The packet is returned unscathed to the caller, unless it is
990 * erroneous, in which case a non-zero return value tells the caller to
993 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
994 * this function is called in the originating context (i.e., not when
995 * forwarding a packet from other node). ip6_output(), which is currently the
996 * only function that calls this function is called in the originating context,
997 * explicitly ensures this condition. It is caller's responsibility to ensure
998 * that if this function is called from somewhere else in the originating
999 * context in the future.
1002 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1009 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1012 if (mrt6debug & DEBUG_FORWARD)
1013 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
1014 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1015 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1020 * Don't forward a packet with Hop limit of zero or one,
1021 * or a packet destined to a local-only group.
1023 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1024 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1029 * Source address check: do not forward packets with unspecified
1030 * source. It was discussed in July 2000, on ipngwg mailing list.
1031 * This is rather more serious than unicast cases, because some
1032 * MLD packets can be sent with the unspecified source address
1033 * (although such packets must normally set 1 to the hop limit field).
1035 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1036 ip6stat.ip6s_cantforward++;
1037 if (ip6_log_time + ip6_log_interval < time_second) {
1038 ip6_log_time = time_second;
1041 "from %s to %s nxt %d received on %s\n",
1042 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1043 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1045 if_name(m->m_pkthdr.rcvif));
1051 * Determine forwarding mifs from the forwarding cache table
1054 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1056 /* Entry exists, so forward if necessary */
1059 return (ip6_mdq(m, ifp, rt));
1062 * If we don't have a route for packet's origin,
1063 * Make a copy of the packet &
1064 * send message to routing daemon
1071 #ifdef UPCALL_TIMING
1075 #endif /* UPCALL_TIMING */
1077 mrt6stat.mrt6s_no_route++;
1079 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1080 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1081 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1082 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1086 * Allocate mbufs early so that we don't do extra work if we
1087 * are just going to fail anyway.
1089 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
1095 mb0 = m_copy(m, 0, M_COPYALL);
1097 * Pullup packet header if needed before storing it,
1098 * as other references may modify it in the meantime.
1101 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1102 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1104 free(rte, M_MRTABLE6);
1109 /* is there an upcall waiting for this packet? */
1110 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1111 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1112 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1113 &rt->mf6c_origin.sin6_addr) &&
1114 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1115 &rt->mf6c_mcastgrp.sin6_addr) &&
1116 (rt->mf6c_stall != NULL))
1123 struct omrt6msg *oim;
1126 /* no upcall, so make a new entry */
1127 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
1130 free(rte, M_MRTABLE6);
1136 * Make a copy of the header to send to the user
1139 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1142 free(rte, M_MRTABLE6);
1144 free(rt, M_MRTABLE6);
1150 * Send message to routing daemon
1152 sin6.sin6_addr = ip6->ip6_src;
1158 switch (ip6_mrouter_ver) {
1161 oim = mtod(mm, struct omrt6msg *);
1162 oim->im6_msgtype = MRT6MSG_NOCACHE;
1167 im = mtod(mm, struct mrt6msg *);
1168 im->im6_msgtype = MRT6MSG_NOCACHE;
1172 free(rte, M_MRTABLE6);
1174 free(rt, M_MRTABLE6);
1180 if (mrt6debug & DEBUG_FORWARD)
1182 "getting the iif info in the kernel\n");
1185 for (mifp = mif6table, mifi = 0;
1186 mifi < nummifs && mifp->m6_ifp != ifp;
1190 switch (ip6_mrouter_ver) {
1193 oim->im6_mif = mifi;
1201 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1202 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1203 "socket queue full\n");
1204 mrt6stat.mrt6s_upq_sockfull++;
1205 free(rte, M_MRTABLE6);
1207 free(rt, M_MRTABLE6);
1212 mrt6stat.mrt6s_upcalls++;
1214 /* insert new entry at head of hash chain */
1215 bzero(rt, sizeof(*rt));
1216 rt->mf6c_origin.sin6_family = AF_INET6;
1217 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1218 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1219 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1220 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1221 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1222 rt->mf6c_expire = UPCALL_EXPIRE;
1224 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1226 /* link into table */
1227 rt->mf6c_next = mf6ctable[hash];
1228 mf6ctable[hash] = rt;
1229 /* Add this entry to the end of the queue */
1230 rt->mf6c_stall = rte;
1232 /* determine if q has overflowed */
1236 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1237 if (++npkts > MAX_UPQ6) {
1238 mrt6stat.mrt6s_upq_ovflw++;
1239 free(rte, M_MRTABLE6);
1245 /* Add this entry to the end of the queue */
1252 #ifdef UPCALL_TIMING
1254 #endif /* UPCALL_TIMING */
1263 * Clean up cache entries if upcalls are not serviced
1264 * Call from the Slow Timeout mechanism, every half second.
1267 expire_upcalls(void *unused)
1270 struct mf6c *mfc, **nptr;
1275 for (i = 0; i < MF6CTBLSIZ; i++) {
1276 if (n6expire[i] == 0)
1278 nptr = &mf6ctable[i];
1279 while ((mfc = *nptr) != NULL) {
1280 rte = mfc->mf6c_stall;
1282 * Skip real cache entries
1283 * Make sure it wasn't marked to not expire (shouldn't happen)
1287 mfc->mf6c_expire != 0 &&
1288 --mfc->mf6c_expire == 0) {
1290 if (mrt6debug & DEBUG_EXPIRE) {
1291 char ip6bufo[INET6_ADDRSTRLEN];
1292 char ip6bufg[INET6_ADDRSTRLEN];
1293 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1294 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1295 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1299 * drop all the packets
1300 * free the mbuf with the pkt, if, timing info
1303 struct rtdetq *n = rte->next;
1305 free(rte, M_MRTABLE6);
1307 } while (rte != NULL);
1308 mrt6stat.mrt6s_cache_cleanups++;
1311 *nptr = mfc->mf6c_next;
1312 free(mfc, M_MRTABLE6);
1314 nptr = &mfc->mf6c_next;
1319 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1320 expire_upcalls, NULL);
1324 * Packet forwarding routine once entry in the cache is made
1327 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1329 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1332 int plen = m->m_pkthdr.len;
1333 struct in6_addr src0, dst0; /* copies for local work */
1334 u_int32_t iszone, idzone, oszone, odzone;
1338 * Macro to send packet on mif. Since RSVP packets don't get counted on
1339 * input, they shouldn't get counted on output, so statistics keeping is
1343 #define MC6_SEND(ip6, mifp, m) do { \
1344 if ((mifp)->m6_flags & MIFF_REGISTER) \
1345 register_send((ip6), (mifp), (m)); \
1347 phyint_send((ip6), (mifp), (m)); \
1348 } while (/*CONSTCOND*/ 0)
1351 * Don't forward if it didn't arrive from the parent mif
1354 mifi = rt->mf6c_parent;
1355 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1356 /* came in the wrong interface */
1358 if (mrt6debug & DEBUG_FORWARD)
1360 "wrong if: ifid %d mifi %d mififid %x\n",
1361 ifp->if_index, mifi,
1362 mif6table[mifi].m6_ifp->if_index);
1364 mrt6stat.mrt6s_wrong_if++;
1365 rt->mf6c_wrong_if++;
1367 * If we are doing PIM processing, and we are forwarding
1368 * packets on this interface, send a message to the
1371 /* have to make sure this is a valid mif */
1372 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1373 if (pim6 && (m->m_flags & M_LOOP) == 0) {
1375 * Check the M_LOOP flag to avoid an
1376 * unnecessary PIM assert.
1377 * XXX: M_LOOP is an ad-hoc hack...
1379 static struct sockaddr_in6 sin6 =
1380 { sizeof(sin6), AF_INET6 };
1385 struct omrt6msg *oim;
1388 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1391 mm->m_len < sizeof(struct ip6_hdr)))
1392 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1400 switch (ip6_mrouter_ver) {
1403 oim = mtod(mm, struct omrt6msg *);
1404 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1409 im = mtod(mm, struct mrt6msg *);
1410 im->im6_msgtype = MRT6MSG_WRONGMIF;
1418 for (mifp = mif6table, iif = 0;
1419 iif < nummifs && mifp &&
1420 mifp->m6_ifp != ifp;
1424 switch (ip6_mrouter_ver) {
1428 sin6.sin6_addr = oim->im6_src;
1433 sin6.sin6_addr = im->im6_src;
1437 mrt6stat.mrt6s_upcalls++;
1439 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1442 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1444 ++mrt6stat.mrt6s_upq_sockfull;
1446 } /* if socket Q full */
1449 } /* if wrong iif */
1451 /* If I sourced this packet, it counts as output, else it was input. */
1452 if (m->m_pkthdr.rcvif == NULL) {
1453 /* XXX: is rcvif really NULL when output?? */
1454 mif6table[mifi].m6_pkt_out++;
1455 mif6table[mifi].m6_bytes_out += plen;
1457 mif6table[mifi].m6_pkt_in++;
1458 mif6table[mifi].m6_bytes_in += plen;
1461 rt->mf6c_byte_cnt += plen;
1464 * For each mif, forward a copy of the packet if there are group
1465 * members downstream on the interface.
1467 src0 = ip6->ip6_src;
1468 dst0 = ip6->ip6_dst;
1469 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1470 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1471 ip6stat.ip6s_badscope++;
1474 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1475 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1477 * check if the outgoing packet is going to break
1479 * XXX For packets through PIM register tunnel
1480 * interface, we believe a routing daemon.
1482 if (!(mif6table[rt->mf6c_parent].m6_flags &
1484 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1485 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1487 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1491 ip6stat.ip6s_badscope++;
1497 mifp->m6_bytes_out += plen;
1498 MC6_SEND(ip6, mifp, m);
1505 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1507 struct mbuf *mb_copy;
1508 struct ifnet *ifp = mifp->m6_ifp;
1510 int s = splnet(); /* needs to protect static "ro" below. */
1511 static struct route_in6 ro;
1512 struct in6_multi *in6m;
1513 struct sockaddr_in6 *dst6;
1517 * Make a new reference to the packet; make sure that
1518 * the IPv6 header is actually copied, not just referenced,
1519 * so that ip6_output() only scribbles on the copy.
1521 mb_copy = m_copy(m, 0, M_COPYALL);
1523 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1524 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1525 if (mb_copy == NULL) {
1529 /* set MCAST flag to the outgoing packet */
1530 mb_copy->m_flags |= M_MCAST;
1533 * If we sourced the packet, call ip6_output since we may devide
1534 * the packet into fragments when the packet is too big for the
1535 * outgoing interface.
1536 * Otherwise, we can simply send the packet to the interface
1539 if (m->m_pkthdr.rcvif == NULL) {
1540 struct ip6_moptions im6o;
1542 im6o.im6o_multicast_ifp = ifp;
1543 /* XXX: ip6_output will override ip6->ip6_hlim */
1544 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1545 im6o.im6o_multicast_loop = 1;
1546 error = ip6_output(mb_copy, NULL, &ro,
1547 IPV6_FORWARDING, &im6o, NULL, NULL);
1550 if (mrt6debug & DEBUG_XMIT)
1551 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1552 mifp - mif6table, error);
1559 * If we belong to the destination multicast group
1560 * on the outgoing interface, loop back a copy.
1562 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
1563 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1565 dst6->sin6_len = sizeof(struct sockaddr_in6);
1566 dst6->sin6_family = AF_INET6;
1567 dst6->sin6_addr = ip6->ip6_dst;
1568 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
1571 * Put the packet into the sending queue of the outgoing interface
1572 * if it would fit in the MTU of the interface.
1574 linkmtu = IN6_LINKMTU(ifp);
1575 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1576 dst6->sin6_len = sizeof(struct sockaddr_in6);
1577 dst6->sin6_family = AF_INET6;
1578 dst6->sin6_addr = ip6->ip6_dst;
1580 * We just call if_output instead of nd6_output here, since
1581 * we need no ND for a multicast forwarded packet...right?
1583 error = (*ifp->if_output)(ifp, mb_copy,
1584 (struct sockaddr *)&ro.ro_dst, NULL);
1586 if (mrt6debug & DEBUG_XMIT)
1587 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1588 mifp - mif6table, error);
1592 * pMTU discovery is intentionally disabled by default, since
1593 * various router may notify pMTU in multicast, which can be
1594 * a DDoS to a router
1597 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1600 if (mrt6debug & DEBUG_XMIT) {
1601 char ip6bufs[INET6_ADDRSTRLEN];
1602 char ip6bufd[INET6_ADDRSTRLEN];
1604 "phyint_send: packet too big on %s o %s "
1605 "g %s size %d(discarded)\n",
1607 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1608 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1609 mb_copy->m_pkthdr.len);
1611 #endif /* MRT6DEBUG */
1612 m_freem(mb_copy); /* simply discard the packet */
1620 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1623 int i, len = m->m_pkthdr.len;
1624 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1625 struct mrt6msg *im6;
1629 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1630 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1631 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1632 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1635 ++pim6stat.pim6s_snd_registers;
1637 /* Make a copy of the packet to send to the user level process */
1638 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1641 mm->m_pkthdr.rcvif = NULL;
1642 mm->m_data += max_linkhdr;
1643 mm->m_len = sizeof(struct ip6_hdr);
1645 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1649 i = MHLEN - M_LEADINGSPACE(mm);
1652 mm = m_pullup(mm, i);
1655 /* TODO: check it! */
1656 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1659 * Send message to routing daemon
1661 sin6.sin6_addr = ip6->ip6_src;
1663 im6 = mtod(mm, struct mrt6msg *);
1664 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1667 im6->im6_mif = mif - mif6table;
1669 /* iif info is not given for reg. encap.n */
1670 mrt6stat.mrt6s_upcalls++;
1672 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1676 "register_send: ip6_mrouter socket queue full\n");
1678 ++mrt6stat.mrt6s_upq_sockfull;
1685 * PIM sparse mode hook
1686 * Receives the pim control messages, and passes them up to the listening
1687 * socket, using rip6_input.
1688 * The only message processed is the REGISTER pim message; the pim header
1689 * is stripped off, and the inner packet is passed to register_mforward.
1692 pim6_input(struct mbuf **mp, int *offp, int proto)
1694 struct pim *pim; /* pointer to a pim struct */
1695 struct ip6_hdr *ip6;
1697 struct mbuf *m = *mp;
1701 ++pim6stat.pim6s_rcv_total;
1703 ip6 = mtod(m, struct ip6_hdr *);
1704 pimlen = m->m_pkthdr.len - *offp;
1709 if (pimlen < PIM_MINLEN) {
1710 ++pim6stat.pim6s_rcv_tooshort;
1712 if (mrt6debug & DEBUG_PIM)
1713 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1716 return (IPPROTO_DONE);
1720 * if the packet is at least as big as a REGISTER, go ahead
1721 * and grab the PIM REGISTER header size, to avoid another
1722 * possible m_pullup() later.
1724 * PIM_MINLEN == pimhdr + u_int32 == 8
1725 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1727 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1730 * Make sure that the IP6 and PIM headers in contiguous memory, and
1731 * possibly the PIM REGISTER header
1733 #ifndef PULLDOWN_TEST
1734 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1735 /* adjust pointer */
1736 ip6 = mtod(m, struct ip6_hdr *);
1738 /* adjust mbuf to point to the PIM header */
1739 pim = (struct pim *)((caddr_t)ip6 + off);
1741 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1743 pim6stat.pim6s_rcv_tooshort++;
1744 return (IPPROTO_DONE);
1748 #define PIM6_CHECKSUM
1749 #ifdef PIM6_CHECKSUM
1754 * Validate checksum.
1755 * If PIM REGISTER, exclude the data packet
1757 if (pim->pim_type == PIM_REGISTER)
1758 cksumlen = PIM_MINLEN;
1762 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1763 ++pim6stat.pim6s_rcv_badsum;
1765 if (mrt6debug & DEBUG_PIM)
1767 "pim6_input: invalid checksum\n");
1770 return (IPPROTO_DONE);
1773 #endif /* PIM_CHECKSUM */
1775 /* PIM version check */
1776 if (pim->pim_ver != PIM_VERSION) {
1777 ++pim6stat.pim6s_rcv_badversion;
1780 "pim6_input: incorrect version %d, expecting %d\n",
1781 pim->pim_ver, PIM_VERSION);
1784 return (IPPROTO_DONE);
1787 if (pim->pim_type == PIM_REGISTER) {
1789 * since this is a REGISTER, we'll make a copy of the register
1790 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1793 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1796 struct ip6_hdr *eip6;
1800 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1803 ++pim6stat.pim6s_rcv_registers;
1805 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1807 if (mrt6debug & DEBUG_PIM)
1809 "pim6_input: register mif not set: %d\n",
1813 return (IPPROTO_DONE);
1816 reghdr = (u_int32_t *)(pim + 1);
1818 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1819 goto pim6_input_to_daemon;
1824 if (pimlen < PIM6_REG_MINLEN) {
1825 ++pim6stat.pim6s_rcv_tooshort;
1826 ++pim6stat.pim6s_rcv_badregisters;
1829 "pim6_input: register packet size too "
1830 "small %d from %s\n",
1831 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1834 return (IPPROTO_DONE);
1837 eip6 = (struct ip6_hdr *) (reghdr + 1);
1839 if (mrt6debug & DEBUG_PIM)
1841 "pim6_input[register], eip6: %s -> %s, "
1843 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1844 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1845 ntohs(eip6->ip6_plen));
1848 /* verify the version number of the inner packet */
1849 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1850 ++pim6stat.pim6s_rcv_badregisters;
1852 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1853 "of the inner packet\n",
1854 (eip6->ip6_vfc & IPV6_VERSION));
1857 return (IPPROTO_NONE);
1860 /* verify the inner packet is destined to a mcast group */
1861 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1862 ++pim6stat.pim6s_rcv_badregisters;
1864 if (mrt6debug & DEBUG_PIM)
1866 "pim6_input: inner packet of register "
1867 "is not multicast %s\n",
1868 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1871 return (IPPROTO_DONE);
1875 * make a copy of the whole header to pass to the daemon later.
1877 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1881 "pim6_input: pim register: "
1882 "could not copy register head\n");
1885 return (IPPROTO_DONE);
1889 * forward the inner ip6 packet; point m_data at the inner ip6.
1891 m_adj(m, off + PIM_MINLEN);
1893 if (mrt6debug & DEBUG_PIM) {
1895 "pim6_input: forwarding decapsulated register: "
1896 "src %s, dst %s, mif %d\n",
1897 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1898 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1903 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1904 dst.sin6_family, 0);
1906 /* prepare the register head to send to the mrouting daemon */
1911 * Pass the PIM message up to the daemon; if it is a register message
1912 * pass the 'head' only up to the daemon. This includes the
1913 * encapsulator ip6 header, pim header, register header and the
1914 * encapsulated ip6 header.
1916 pim6_input_to_daemon:
1917 rip6_input(&m, offp, proto);
1918 return (IPPROTO_DONE);