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/module.h>
95 #include <sys/domain.h>
96 #include <sys/protosw.h>
97 #include <sys/signalvar.h>
98 #include <sys/socket.h>
99 #include <sys/socketvar.h>
100 #include <sys/sockio.h>
102 #include <sys/sysctl.h>
103 #include <sys/syslog.h>
104 #include <sys/systm.h>
105 #include <sys/time.h>
108 #include <net/if_types.h>
109 #include <net/raw_cb.h>
110 #include <net/vnet.h>
112 #include <netinet/in.h>
113 #include <netinet/in_var.h>
114 #include <netinet/icmp6.h>
115 #include <netinet/ip_encap.h>
117 #include <netinet/ip6.h>
118 #include <netinet6/ip6_var.h>
119 #include <netinet6/scope6_var.h>
120 #include <netinet6/nd6.h>
121 #include <netinet6/ip6_mroute.h>
122 #include <netinet6/ip6protosw.h>
123 #include <netinet6/pim6.h>
124 #include <netinet6/pim6_var.h>
126 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
128 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
129 #define M_HASCL(m) ((m)->m_flags & M_EXT)
131 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
132 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
133 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
134 static int set_pim6(int *);
135 static int socket_send(struct socket *, struct mbuf *,
136 struct sockaddr_in6 *);
138 extern int in6_mcast_loop;
139 extern struct domain inet6domain;
141 static const struct encaptab *pim6_encap_cookie;
142 static const struct ip6protosw in6_pim_protosw = {
144 .pr_domain = &inet6domain,
145 .pr_protocol = IPPROTO_PIM,
146 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
147 .pr_input = pim6_input,
148 .pr_output = rip6_output,
149 .pr_ctloutput = rip6_ctloutput,
150 .pr_usrreqs = &rip6_usrreqs
152 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
154 static VNET_DEFINE(int, ip6_mrouter_ver) = 0;
155 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
157 SYSCTL_DECL(_net_inet6);
158 SYSCTL_DECL(_net_inet6_ip6);
159 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
161 static struct mrt6stat mrt6stat;
162 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
166 #define NO_RTE_FOUND 0x1
167 #define RTE_FOUND 0x2
169 static struct mtx mrouter6_mtx;
170 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
171 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
172 #define MROUTER6_LOCK_ASSERT() do { \
173 mtx_assert(&mrouter6_mtx, MA_OWNED); \
174 NET_ASSERT_GIANT(); \
176 #define MROUTER6_LOCK_INIT() \
177 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
178 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
180 static struct mf6c *mf6ctable[MF6CTBLSIZ];
181 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
182 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
183 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
184 "netinet6/ip6_mroute.h)");
186 static struct mtx mfc6_mtx;
187 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
188 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
189 #define MFC6_LOCK_ASSERT() do { \
190 mtx_assert(&mfc6_mtx, MA_OWNED); \
191 NET_ASSERT_GIANT(); \
193 #define MFC6_LOCK_INIT() \
194 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
195 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
197 static u_char n6expire[MF6CTBLSIZ];
199 static struct mif6 mif6table[MAXMIFS];
200 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
201 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
202 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
204 static struct mtx mif6_mtx;
205 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
206 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
207 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
208 #define MIF6_LOCK_INIT() \
209 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
210 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
213 static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */
214 #define V_mrt6debug VNET(mrt6debug)
215 #define DEBUG_MFC 0x02
216 #define DEBUG_FORWARD 0x04
217 #define DEBUG_EXPIRE 0x08
218 #define DEBUG_XMIT 0x10
219 #define DEBUG_REG 0x20
220 #define DEBUG_PIM 0x40
223 static void expire_upcalls(void *);
224 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
225 #define UPCALL_EXPIRE 6 /* number of timeouts */
228 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
232 * 'Interfaces' associated with decapsulator (so we can tell
233 * packets that went through it from ones that get reflected
234 * by a broken gateway). Different from IPv4 register_if,
235 * these interfaces are linked into the system ifnet list,
236 * because per-interface IPv6 statistics are maintained in
237 * ifp->if_afdata. But it does not have any routes point
238 * to them. I.e., packets can't be sent this way. They
239 * only exist as a placeholder for multicast source
242 static struct ifnet *multicast_register_if6;
244 #define ENCAP_HOPS 64
249 static mifi_t nummifs = 0;
250 static mifi_t reg_mif_num = (mifi_t)-1;
252 static struct pim6stat pim6stat;
253 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
255 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
257 static VNET_DEFINE(int, pim6);
258 #define V_pim6 VNET(pim6)
261 * Hash function for a source, group entry
263 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
264 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
265 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
266 (g).s6_addr32[2] ^ (g).s6_addr32[3])
269 * Find a route for a given origin IPv6 address and Multicast group address.
271 #define MF6CFIND(o, g, rt) do { \
272 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
274 mrt6stat.mrt6s_mfc_lookups++; \
276 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
277 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
278 (_rt->mf6c_stall == NULL)) { \
282 _rt = _rt->mf6c_next; \
285 mrt6stat.mrt6s_mfc_misses++; \
287 } while (/*CONSTCOND*/ 0)
290 * Macros to compute elapsed time efficiently
291 * Borrowed from Van Jacobson's scheduling code
292 * XXX: replace with timersub() ?
294 #define TV_DELTA(a, b, delta) do { \
297 delta = (a).tv_usec - (b).tv_usec; \
298 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
307 delta += (1000000 * xxs); \
310 } while (/*CONSTCOND*/ 0)
312 /* XXX: replace with timercmp(a, b, <) ? */
313 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
314 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
317 #define UPCALL_MAX 50
318 static u_long upcall_data[UPCALL_MAX + 1];
319 static void collate();
320 #endif /* UPCALL_TIMING */
322 static int ip6_mrouter_init(struct socket *, int, int);
323 static int add_m6fc(struct mf6cctl *);
324 static int add_m6if(struct mif6ctl *);
325 static int del_m6fc(struct mf6cctl *);
326 static int del_m6if(mifi_t *);
327 static int del_m6if_locked(mifi_t *);
328 static int get_mif6_cnt(struct sioc_mif_req6 *);
329 static int get_sg_cnt(struct sioc_sg_req6 *);
331 static struct callout expire_upcalls_ch;
333 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
334 int X_ip6_mrouter_done(void);
335 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
336 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
337 int X_mrt6_ioctl(u_long, caddr_t);
340 * Handle MRT setsockopt commands to modify the multicast routing tables.
343 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
351 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
354 switch (sopt->sopt_name) {
359 error = sooptcopyin(sopt, &optval, sizeof(optval),
363 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
366 error = X_ip6_mrouter_done();
369 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
372 error = add_m6if(&mifc);
375 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
378 error = add_m6fc(&mfcc);
381 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
384 error = del_m6fc(&mfcc);
387 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
390 error = del_m6if(&mifi);
393 error = sooptcopyin(sopt, &optval, sizeof(optval),
397 error = set_pim6(&optval);
408 * Handle MRT getsockopt commands
411 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
415 if (so != V_ip6_mrouter)
418 switch (sopt->sopt_name) {
420 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
427 * Handle ioctl commands to obtain information from the cache
430 X_mrt6_ioctl(u_long cmd, caddr_t data)
437 case SIOCGETSGCNT_IN6:
438 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
441 case SIOCGETMIFCNT_IN6:
442 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
453 * returns the packet, byte, rpf-failure count for the source group provided
456 get_sg_cnt(struct sioc_sg_req6 *req)
465 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
469 req->pktcnt = rt->mf6c_pkt_cnt;
470 req->bytecnt = rt->mf6c_byte_cnt;
471 req->wrong_if = rt->mf6c_wrong_if;
480 * returns the input and output packet and byte counts on the mif provided
483 get_mif6_cnt(struct sioc_mif_req6 *req)
493 if (mifi >= nummifs) {
496 req->icount = mif6table[mifi].m6_pkt_in;
497 req->ocount = mif6table[mifi].m6_pkt_out;
498 req->ibytes = mif6table[mifi].m6_bytes_in;
499 req->obytes = mif6table[mifi].m6_bytes_out;
510 if ((*i != 1) && (*i != 0))
519 * Enable multicast routing
522 ip6_mrouter_init(struct socket *so, int v, int cmd)
528 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
529 so->so_type, so->so_proto->pr_protocol);
532 if (so->so_type != SOCK_RAW ||
533 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
537 return (ENOPROTOOPT);
541 if (V_ip6_mrouter != NULL) {
547 V_ip6_mrouter_ver = cmd;
549 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
550 bzero((caddr_t)n6expire, sizeof(n6expire));
552 V_pim6 = 0;/* used for stubbing out/in pim stuff */
554 callout_init(&expire_upcalls_ch, 0);
555 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
556 expire_upcalls, NULL);
562 log(LOG_DEBUG, "ip6_mrouter_init\n");
569 * Disable IPv6 multicast forwarding.
572 X_ip6_mrouter_done(void)
581 if (V_ip6_mrouter == NULL) {
587 * For each phyint in use, disable promiscuous reception of all IPv6
590 for (mifi = 0; mifi < nummifs; mifi++) {
591 if (mif6table[mifi].m6_ifp &&
592 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
593 if_allmulti(mif6table[mifi].m6_ifp, 0);
596 bzero((caddr_t)mif6table, sizeof(mif6table));
599 V_pim6 = 0; /* used to stub out/in pim specific code */
601 callout_stop(&expire_upcalls_ch);
604 * Free all multicast forwarding cache entries.
607 for (i = 0; i < MF6CTBLSIZ; i++) {
612 for (rte = rt->mf6c_stall; rte != NULL; ) {
613 struct rtdetq *n = rte->next;
616 free(rte, M_MRTABLE6);
621 free(frt, M_MRTABLE6);
624 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
628 * Reset register interface
630 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
631 if_detach(multicast_register_if6);
632 if_free(multicast_register_if6);
633 reg_mif_num = (mifi_t)-1;
634 multicast_register_if6 = NULL;
637 V_ip6_mrouter = NULL;
638 V_ip6_mrouter_ver = 0;
644 log(LOG_DEBUG, "ip6_mrouter_done\n");
650 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
653 * Add a mif to the mif table
656 add_m6if(struct mif6ctl *mifcp)
664 if (mifcp->mif6c_mifi >= MAXMIFS) {
668 mifp = mif6table + mifcp->mif6c_mifi;
669 if (mifp->m6_ifp != NULL) {
671 return (EADDRINUSE); /* XXX: is it appropriate? */
673 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
678 ifp = ifnet_byindex(mifcp->mif6c_pifi);
680 if (mifcp->mif6c_flags & MIFF_REGISTER) {
681 if (reg_mif_num == (mifi_t)-1) {
682 ifp = if_alloc(IFT_OTHER);
684 if_initname(ifp, "register_mif", 0);
685 ifp->if_flags |= IFF_LOOPBACK;
687 multicast_register_if6 = ifp;
688 reg_mif_num = mifcp->mif6c_mifi;
690 * it is impossible to guess the ifindex of the
691 * register interface. So mif6c_pifi is automatically
694 mifcp->mif6c_pifi = ifp->if_index;
696 ifp = multicast_register_if6;
699 /* Make sure the interface supports multicast */
700 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
705 error = if_allmulti(ifp, 1);
712 mifp->m6_flags = mifcp->mif6c_flags;
715 /* initialize per mif pkt counters */
717 mifp->m6_pkt_out = 0;
718 mifp->m6_bytes_in = 0;
719 mifp->m6_bytes_out = 0;
720 bzero(&mifp->m6_route, sizeof(mifp->m6_route));
722 /* Adjust nummifs up if the mifi is higher than nummifs */
723 if (nummifs <= mifcp->mif6c_mifi)
724 nummifs = mifcp->mif6c_mifi + 1;
731 "add_mif #%d, phyint %s\n",
740 * Delete a mif from the mif table
743 del_m6if_locked(mifi_t *mifip)
745 struct mif6 *mifp = mif6table + *mifip;
751 if (*mifip >= nummifs)
753 if (mifp->m6_ifp == NULL)
756 if (!(mifp->m6_flags & MIFF_REGISTER)) {
757 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
761 if (reg_mif_num != (mifi_t)-1 &&
762 multicast_register_if6 != NULL) {
763 if_detach(multicast_register_if6);
764 if_free(multicast_register_if6);
765 reg_mif_num = (mifi_t)-1;
766 multicast_register_if6 = NULL;
770 bzero((caddr_t)mifp, sizeof(*mifp));
772 /* Adjust nummifs down */
773 for (mifi = nummifs; mifi > 0; mifi--)
774 if (mif6table[mifi - 1].m6_ifp)
780 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
787 del_m6if(mifi_t *mifip)
792 cc = del_m6if_locked(mifip);
802 add_m6fc(struct mf6cctl *mfccp)
808 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
812 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
813 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
815 /* If an entry already exists, just update the fields */
818 if (V_mrt6debug & DEBUG_MFC) {
820 "add_m6fc no upcall h %d o %s g %s p %x\n",
821 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
822 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
823 mfccp->mf6cc_parent);
827 rt->mf6c_parent = mfccp->mf6cc_parent;
828 rt->mf6c_ifset = mfccp->mf6cc_ifset;
835 * Find the entry for which the upcall was made and update
837 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
838 mfccp->mf6cc_mcastgrp.sin6_addr);
839 for (rt = mf6ctable[hash], nstl = 0; 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) &&
844 (rt->mf6c_stall != NULL)) {
848 "add_m6fc: %s o %s g %s p %x dbx %p\n",
849 "multiple kernel entries",
851 &mfccp->mf6cc_origin.sin6_addr),
853 &mfccp->mf6cc_mcastgrp.sin6_addr),
854 mfccp->mf6cc_parent, rt->mf6c_stall);
857 if (V_mrt6debug & DEBUG_MFC)
859 "add_m6fc o %s g %s p %x dbg %x\n",
861 &mfccp->mf6cc_origin.sin6_addr),
863 &mfccp->mf6cc_mcastgrp.sin6_addr),
864 mfccp->mf6cc_parent, rt->mf6c_stall);
867 rt->mf6c_origin = mfccp->mf6cc_origin;
868 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
869 rt->mf6c_parent = mfccp->mf6cc_parent;
870 rt->mf6c_ifset = mfccp->mf6cc_ifset;
871 /* initialize pkt counters per src-grp */
872 rt->mf6c_pkt_cnt = 0;
873 rt->mf6c_byte_cnt = 0;
874 rt->mf6c_wrong_if = 0;
876 rt->mf6c_expire = 0; /* Don't clean this guy up */
879 /* free packets Qed at the end of this entry */
880 for (rte = rt->mf6c_stall; rte != NULL; ) {
881 struct rtdetq *n = rte->next;
882 ip6_mdq(rte->m, rte->ifp, rt);
886 #endif /* UPCALL_TIMING */
887 free(rte, M_MRTABLE6);
890 rt->mf6c_stall = NULL;
895 * It is possible that an entry is being inserted without an upcall
899 if (V_mrt6debug & DEBUG_MFC)
901 "add_mfc no upcall h %d o %s g %s p %x\n",
903 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
904 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
905 mfccp->mf6cc_parent);
908 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
910 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
911 &mfccp->mf6cc_origin.sin6_addr)&&
912 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
913 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
915 rt->mf6c_origin = mfccp->mf6cc_origin;
916 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
917 rt->mf6c_parent = mfccp->mf6cc_parent;
918 rt->mf6c_ifset = mfccp->mf6cc_ifset;
919 /* initialize pkt counters per src-grp */
920 rt->mf6c_pkt_cnt = 0;
921 rt->mf6c_byte_cnt = 0;
922 rt->mf6c_wrong_if = 0;
930 /* no upcall, so make a new entry */
931 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
938 /* insert new entry at head of hash chain */
939 rt->mf6c_origin = mfccp->mf6cc_origin;
940 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
941 rt->mf6c_parent = mfccp->mf6cc_parent;
942 rt->mf6c_ifset = mfccp->mf6cc_ifset;
943 /* initialize pkt counters per src-grp */
944 rt->mf6c_pkt_cnt = 0;
945 rt->mf6c_byte_cnt = 0;
946 rt->mf6c_wrong_if = 0;
948 rt->mf6c_stall = NULL;
950 /* link into table */
951 rt->mf6c_next = mf6ctable[hash];
952 mf6ctable[hash] = rt;
962 * collect delay statistics on the upcalls
965 collate(struct timeval *t)
975 TV_DELTA(tp, *t, delta);
984 #endif /* UPCALL_TIMING */
987 * Delete an mfc entry
990 del_m6fc(struct mf6cctl *mfccp)
992 struct sockaddr_in6 origin;
993 struct sockaddr_in6 mcastgrp;
998 origin = mfccp->mf6cc_origin;
999 mcastgrp = mfccp->mf6cc_mcastgrp;
1000 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1003 if (V_mrt6debug & DEBUG_MFC) {
1004 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1005 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
1006 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1007 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1013 nptr = &mf6ctable[hash];
1014 while ((rt = *nptr) != NULL) {
1015 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1016 &rt->mf6c_origin.sin6_addr) &&
1017 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1018 &rt->mf6c_mcastgrp.sin6_addr) &&
1019 rt->mf6c_stall == NULL)
1022 nptr = &rt->mf6c_next;
1026 return (EADDRNOTAVAIL);
1029 *nptr = rt->mf6c_next;
1030 free(rt, M_MRTABLE6);
1038 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1042 if (sbappendaddr(&s->so_rcv,
1043 (struct sockaddr *)src,
1044 mm, (struct mbuf *)0) != 0) {
1054 * IPv6 multicast forwarding function. This function assumes that the packet
1055 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1056 * pointed to by "ifp", and the packet is to be relayed to other networks
1057 * that have members of the packet's destination IPv6 multicast group.
1059 * The packet is returned unscathed to the caller, unless it is
1060 * erroneous, in which case a non-zero return value tells the caller to
1063 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1064 * this function is called in the originating context (i.e., not when
1065 * forwarding a packet from other node). ip6_output(), which is currently the
1066 * only function that calls this function is called in the originating context,
1067 * explicitly ensures this condition. It is caller's responsibility to ensure
1068 * that if this function is called from somewhere else in the originating
1069 * context in the future.
1072 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1078 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1081 if (V_mrt6debug & DEBUG_FORWARD)
1082 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
1083 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1089 * Don't forward a packet with Hop limit of zero or one,
1090 * or a packet destined to a local-only group.
1092 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1093 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1098 * Source address check: do not forward packets with unspecified
1099 * source. It was discussed in July 2000, on ipngwg mailing list.
1100 * This is rather more serious than unicast cases, because some
1101 * MLD packets can be sent with the unspecified source address
1102 * (although such packets must normally set 1 to the hop limit field).
1104 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1105 V_ip6stat.ip6s_cantforward++;
1106 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
1107 V_ip6_log_time = time_second;
1110 "from %s to %s nxt %d received on %s\n",
1111 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1114 if_name(m->m_pkthdr.rcvif));
1122 * Determine forwarding mifs from the forwarding cache table
1124 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1126 /* Entry exists, so forward if necessary */
1129 return (ip6_mdq(m, ifp, rt));
1132 * If we don't have a route for packet's origin,
1133 * Make a copy of the packet &
1134 * send message to routing daemon
1141 #ifdef UPCALL_TIMING
1145 #endif /* UPCALL_TIMING */
1147 mrt6stat.mrt6s_no_route++;
1149 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1150 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1151 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1152 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1156 * Allocate mbufs early so that we don't do extra work if we
1157 * are just going to fail anyway.
1159 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
1165 mb0 = m_copy(m, 0, M_COPYALL);
1167 * Pullup packet header if needed before storing it,
1168 * as other references may modify it in the meantime.
1171 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1172 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1174 free(rte, M_MRTABLE6);
1179 /* is there an upcall waiting for this packet? */
1180 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1181 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1182 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1183 &rt->mf6c_origin.sin6_addr) &&
1184 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1185 &rt->mf6c_mcastgrp.sin6_addr) &&
1186 (rt->mf6c_stall != NULL))
1193 struct omrt6msg *oim;
1196 /* no upcall, so make a new entry */
1197 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
1200 free(rte, M_MRTABLE6);
1206 * Make a copy of the header to send to the user
1209 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1212 free(rte, M_MRTABLE6);
1214 free(rt, M_MRTABLE6);
1220 * Send message to routing daemon
1222 sin6.sin6_addr = ip6->ip6_src;
1228 switch (V_ip6_mrouter_ver) {
1231 oim = mtod(mm, struct omrt6msg *);
1232 oim->im6_msgtype = MRT6MSG_NOCACHE;
1237 im = mtod(mm, struct mrt6msg *);
1238 im->im6_msgtype = MRT6MSG_NOCACHE;
1242 free(rte, M_MRTABLE6);
1244 free(rt, M_MRTABLE6);
1250 if (V_mrt6debug & DEBUG_FORWARD)
1252 "getting the iif info in the kernel\n");
1255 for (mifp = mif6table, mifi = 0;
1256 mifi < nummifs && mifp->m6_ifp != ifp;
1260 switch (V_ip6_mrouter_ver) {
1263 oim->im6_mif = mifi;
1271 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1272 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1273 "socket queue full\n");
1274 mrt6stat.mrt6s_upq_sockfull++;
1275 free(rte, M_MRTABLE6);
1277 free(rt, M_MRTABLE6);
1282 mrt6stat.mrt6s_upcalls++;
1284 /* insert new entry at head of hash chain */
1285 bzero(rt, sizeof(*rt));
1286 rt->mf6c_origin.sin6_family = AF_INET6;
1287 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1288 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1289 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1290 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1291 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1292 rt->mf6c_expire = UPCALL_EXPIRE;
1294 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1296 /* link into table */
1297 rt->mf6c_next = mf6ctable[hash];
1298 mf6ctable[hash] = rt;
1299 /* Add this entry to the end of the queue */
1300 rt->mf6c_stall = rte;
1302 /* determine if q has overflowed */
1306 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1307 if (++npkts > MAX_UPQ6) {
1308 mrt6stat.mrt6s_upq_ovflw++;
1309 free(rte, M_MRTABLE6);
1315 /* Add this entry to the end of the queue */
1322 #ifdef UPCALL_TIMING
1324 #endif /* UPCALL_TIMING */
1333 * Clean up cache entries if upcalls are not serviced
1334 * Call from the Slow Timeout mechanism, every half second.
1337 expire_upcalls(void *unused)
1340 struct mf6c *mfc, **nptr;
1344 for (i = 0; i < MF6CTBLSIZ; i++) {
1345 if (n6expire[i] == 0)
1347 nptr = &mf6ctable[i];
1348 while ((mfc = *nptr) != NULL) {
1349 rte = mfc->mf6c_stall;
1351 * Skip real cache entries
1352 * Make sure it wasn't marked to not expire (shouldn't happen)
1356 mfc->mf6c_expire != 0 &&
1357 --mfc->mf6c_expire == 0) {
1359 if (V_mrt6debug & DEBUG_EXPIRE) {
1360 char ip6bufo[INET6_ADDRSTRLEN];
1361 char ip6bufg[INET6_ADDRSTRLEN];
1362 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1363 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1364 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1368 * drop all the packets
1369 * free the mbuf with the pkt, if, timing info
1372 struct rtdetq *n = rte->next;
1374 free(rte, M_MRTABLE6);
1376 } while (rte != NULL);
1377 mrt6stat.mrt6s_cache_cleanups++;
1380 *nptr = mfc->mf6c_next;
1381 free(mfc, M_MRTABLE6);
1383 nptr = &mfc->mf6c_next;
1388 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1389 expire_upcalls, NULL);
1393 * Packet forwarding routine once entry in the cache is made
1396 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1398 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1401 int plen = m->m_pkthdr.len;
1402 struct in6_addr src0, dst0; /* copies for local work */
1403 u_int32_t iszone, idzone, oszone, odzone;
1407 * Macro to send packet on mif. Since RSVP packets don't get counted on
1408 * input, they shouldn't get counted on output, so statistics keeping is
1412 #define MC6_SEND(ip6, mifp, m) do { \
1413 if ((mifp)->m6_flags & MIFF_REGISTER) \
1414 register_send((ip6), (mifp), (m)); \
1416 phyint_send((ip6), (mifp), (m)); \
1417 } while (/*CONSTCOND*/ 0)
1420 * Don't forward if it didn't arrive from the parent mif
1423 mifi = rt->mf6c_parent;
1424 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1425 /* came in the wrong interface */
1427 if (V_mrt6debug & DEBUG_FORWARD)
1429 "wrong if: ifid %d mifi %d mififid %x\n",
1430 ifp->if_index, mifi,
1431 mif6table[mifi].m6_ifp->if_index);
1433 mrt6stat.mrt6s_wrong_if++;
1434 rt->mf6c_wrong_if++;
1436 * If we are doing PIM processing, and we are forwarding
1437 * packets on this interface, send a message to the
1440 /* have to make sure this is a valid mif */
1441 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1442 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1444 * Check the M_LOOP flag to avoid an
1445 * unnecessary PIM assert.
1446 * XXX: M_LOOP is an ad-hoc hack...
1448 static struct sockaddr_in6 sin6 =
1449 { sizeof(sin6), AF_INET6 };
1454 struct omrt6msg *oim;
1457 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1460 mm->m_len < sizeof(struct ip6_hdr)))
1461 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1469 switch (V_ip6_mrouter_ver) {
1472 oim = mtod(mm, struct omrt6msg *);
1473 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1478 im = mtod(mm, struct mrt6msg *);
1479 im->im6_msgtype = MRT6MSG_WRONGMIF;
1487 for (mifp = mif6table, iif = 0;
1488 iif < nummifs && mifp &&
1489 mifp->m6_ifp != ifp;
1493 switch (V_ip6_mrouter_ver) {
1497 sin6.sin6_addr = oim->im6_src;
1502 sin6.sin6_addr = im->im6_src;
1506 mrt6stat.mrt6s_upcalls++;
1508 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1511 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1513 ++mrt6stat.mrt6s_upq_sockfull;
1515 } /* if socket Q full */
1518 } /* if wrong iif */
1520 /* If I sourced this packet, it counts as output, else it was input. */
1521 if (m->m_pkthdr.rcvif == NULL) {
1522 /* XXX: is rcvif really NULL when output?? */
1523 mif6table[mifi].m6_pkt_out++;
1524 mif6table[mifi].m6_bytes_out += plen;
1526 mif6table[mifi].m6_pkt_in++;
1527 mif6table[mifi].m6_bytes_in += plen;
1530 rt->mf6c_byte_cnt += plen;
1533 * For each mif, forward a copy of the packet if there are group
1534 * members downstream on the interface.
1536 src0 = ip6->ip6_src;
1537 dst0 = ip6->ip6_dst;
1538 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1539 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1540 V_ip6stat.ip6s_badscope++;
1543 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1544 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1546 * check if the outgoing packet is going to break
1548 * XXX For packets through PIM register tunnel
1549 * interface, we believe a routing daemon.
1551 if (!(mif6table[rt->mf6c_parent].m6_flags &
1553 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1554 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1556 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1560 V_ip6stat.ip6s_badscope++;
1566 mifp->m6_bytes_out += plen;
1567 MC6_SEND(ip6, mifp, m);
1574 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1576 struct mbuf *mb_copy;
1577 struct ifnet *ifp = mifp->m6_ifp;
1579 struct sockaddr_in6 *dst6;
1582 dst6 = &mifp->m6_route.ro_dst;
1585 * Make a new reference to the packet; make sure that
1586 * the IPv6 header is actually copied, not just referenced,
1587 * so that ip6_output() only scribbles on the copy.
1589 mb_copy = m_copy(m, 0, M_COPYALL);
1591 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1592 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1593 if (mb_copy == NULL) {
1596 /* set MCAST flag to the outgoing packet */
1597 mb_copy->m_flags |= M_MCAST;
1600 * If we sourced the packet, call ip6_output since we may devide
1601 * the packet into fragments when the packet is too big for the
1602 * outgoing interface.
1603 * Otherwise, we can simply send the packet to the interface
1606 if (m->m_pkthdr.rcvif == NULL) {
1607 struct ip6_moptions im6o;
1609 im6o.im6o_multicast_ifp = ifp;
1610 /* XXX: ip6_output will override ip6->ip6_hlim */
1611 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1612 im6o.im6o_multicast_loop = 1;
1613 error = ip6_output(mb_copy, NULL, &mifp->m6_route,
1614 IPV6_FORWARDING, &im6o, NULL, NULL);
1617 if (V_mrt6debug & DEBUG_XMIT)
1618 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1619 mifp - mif6table, error);
1625 * If configured to loop back multicasts by default,
1626 * loop back a copy now.
1628 if (in6_mcast_loop) {
1629 dst6->sin6_len = sizeof(struct sockaddr_in6);
1630 dst6->sin6_family = AF_INET6;
1631 dst6->sin6_addr = ip6->ip6_dst;
1632 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst);
1636 * Put the packet into the sending queue of the outgoing interface
1637 * if it would fit in the MTU of the interface.
1639 linkmtu = IN6_LINKMTU(ifp);
1640 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1641 dst6->sin6_len = sizeof(struct sockaddr_in6);
1642 dst6->sin6_family = AF_INET6;
1643 dst6->sin6_addr = ip6->ip6_dst;
1645 * We just call if_output instead of nd6_output here, since
1646 * we need no ND for a multicast forwarded packet...right?
1648 error = (*ifp->if_output)(ifp, mb_copy,
1649 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL);
1651 if (V_mrt6debug & DEBUG_XMIT)
1652 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1653 mifp - mif6table, error);
1657 * pMTU discovery is intentionally disabled by default, since
1658 * various router may notify pMTU in multicast, which can be
1659 * a DDoS to a router
1661 if (V_ip6_mcast_pmtu)
1662 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1665 if (V_mrt6debug & DEBUG_XMIT) {
1666 char ip6bufs[INET6_ADDRSTRLEN];
1667 char ip6bufd[INET6_ADDRSTRLEN];
1669 "phyint_send: packet too big on %s o %s "
1670 "g %s size %d(discarded)\n",
1672 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1673 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1674 mb_copy->m_pkthdr.len);
1676 #endif /* MRT6DEBUG */
1677 m_freem(mb_copy); /* simply discard the packet */
1683 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1686 int i, len = m->m_pkthdr.len;
1687 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1688 struct mrt6msg *im6;
1692 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1693 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1694 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1695 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1698 ++pim6stat.pim6s_snd_registers;
1700 /* Make a copy of the packet to send to the user level process */
1701 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1704 mm->m_pkthdr.rcvif = NULL;
1705 mm->m_data += max_linkhdr;
1706 mm->m_len = sizeof(struct ip6_hdr);
1708 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1712 i = MHLEN - M_LEADINGSPACE(mm);
1715 mm = m_pullup(mm, i);
1718 /* TODO: check it! */
1719 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1722 * Send message to routing daemon
1724 sin6.sin6_addr = ip6->ip6_src;
1726 im6 = mtod(mm, struct mrt6msg *);
1727 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1730 im6->im6_mif = mif - mif6table;
1732 /* iif info is not given for reg. encap.n */
1733 mrt6stat.mrt6s_upcalls++;
1735 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1739 "register_send: ip6_mrouter socket queue full\n");
1741 ++mrt6stat.mrt6s_upq_sockfull;
1748 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1749 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1753 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1757 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1759 if (proto != IPPROTO_PIM)
1760 return 0; /* not for us; reject the datagram. */
1762 return 64; /* claim the datagram. */
1766 * PIM sparse mode hook
1767 * Receives the pim control messages, and passes them up to the listening
1768 * socket, using rip6_input.
1769 * The only message processed is the REGISTER pim message; the pim header
1770 * is stripped off, and the inner packet is passed to register_mforward.
1773 pim6_input(struct mbuf **mp, int *offp, int proto)
1775 struct pim *pim; /* pointer to a pim struct */
1776 struct ip6_hdr *ip6;
1778 struct mbuf *m = *mp;
1782 ++pim6stat.pim6s_rcv_total;
1784 ip6 = mtod(m, struct ip6_hdr *);
1785 pimlen = m->m_pkthdr.len - *offp;
1790 if (pimlen < PIM_MINLEN) {
1791 ++pim6stat.pim6s_rcv_tooshort;
1793 if (V_mrt6debug & DEBUG_PIM)
1794 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1797 return (IPPROTO_DONE);
1801 * if the packet is at least as big as a REGISTER, go ahead
1802 * and grab the PIM REGISTER header size, to avoid another
1803 * possible m_pullup() later.
1805 * PIM_MINLEN == pimhdr + u_int32 == 8
1806 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1808 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1811 * Make sure that the IP6 and PIM headers in contiguous memory, and
1812 * possibly the PIM REGISTER header
1814 #ifndef PULLDOWN_TEST
1815 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1816 /* adjust pointer */
1817 ip6 = mtod(m, struct ip6_hdr *);
1819 /* adjust mbuf to point to the PIM header */
1820 pim = (struct pim *)((caddr_t)ip6 + off);
1822 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1824 pim6stat.pim6s_rcv_tooshort++;
1825 return (IPPROTO_DONE);
1829 #define PIM6_CHECKSUM
1830 #ifdef PIM6_CHECKSUM
1835 * Validate checksum.
1836 * If PIM REGISTER, exclude the data packet
1838 if (pim->pim_type == PIM_REGISTER)
1839 cksumlen = PIM_MINLEN;
1843 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1844 ++pim6stat.pim6s_rcv_badsum;
1846 if (V_mrt6debug & DEBUG_PIM)
1848 "pim6_input: invalid checksum\n");
1851 return (IPPROTO_DONE);
1854 #endif /* PIM_CHECKSUM */
1856 /* PIM version check */
1857 if (pim->pim_ver != PIM_VERSION) {
1858 ++pim6stat.pim6s_rcv_badversion;
1861 "pim6_input: incorrect version %d, expecting %d\n",
1862 pim->pim_ver, PIM_VERSION);
1865 return (IPPROTO_DONE);
1868 if (pim->pim_type == PIM_REGISTER) {
1870 * since this is a REGISTER, we'll make a copy of the register
1871 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1874 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1877 struct ip6_hdr *eip6;
1881 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1884 ++pim6stat.pim6s_rcv_registers;
1886 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1888 if (V_mrt6debug & DEBUG_PIM)
1890 "pim6_input: register mif not set: %d\n",
1894 return (IPPROTO_DONE);
1897 reghdr = (u_int32_t *)(pim + 1);
1899 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1900 goto pim6_input_to_daemon;
1905 if (pimlen < PIM6_REG_MINLEN) {
1906 ++pim6stat.pim6s_rcv_tooshort;
1907 ++pim6stat.pim6s_rcv_badregisters;
1910 "pim6_input: register packet size too "
1911 "small %d from %s\n",
1912 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1915 return (IPPROTO_DONE);
1918 eip6 = (struct ip6_hdr *) (reghdr + 1);
1920 if (V_mrt6debug & DEBUG_PIM)
1922 "pim6_input[register], eip6: %s -> %s, "
1924 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1925 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1926 ntohs(eip6->ip6_plen));
1929 /* verify the version number of the inner packet */
1930 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1931 ++pim6stat.pim6s_rcv_badregisters;
1933 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1934 "of the inner packet\n",
1935 (eip6->ip6_vfc & IPV6_VERSION));
1938 return (IPPROTO_NONE);
1941 /* verify the inner packet is destined to a mcast group */
1942 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1943 ++pim6stat.pim6s_rcv_badregisters;
1945 if (V_mrt6debug & DEBUG_PIM)
1947 "pim6_input: inner packet of register "
1948 "is not multicast %s\n",
1949 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1952 return (IPPROTO_DONE);
1956 * make a copy of the whole header to pass to the daemon later.
1958 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1962 "pim6_input: pim register: "
1963 "could not copy register head\n");
1966 return (IPPROTO_DONE);
1970 * forward the inner ip6 packet; point m_data at the inner ip6.
1972 m_adj(m, off + PIM_MINLEN);
1974 if (V_mrt6debug & DEBUG_PIM) {
1976 "pim6_input: forwarding decapsulated register: "
1977 "src %s, dst %s, mif %d\n",
1978 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1979 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1984 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1985 dst.sin6_family, 0);
1987 /* prepare the register head to send to the mrouting daemon */
1992 * Pass the PIM message up to the daemon; if it is a register message
1993 * pass the 'head' only up to the daemon. This includes the
1994 * encapsulator ip6 header, pim header, register header and the
1995 * encapsulated ip6 header.
1997 pim6_input_to_daemon:
1998 rip6_input(&m, offp, proto);
1999 return (IPPROTO_DONE);
2003 ip6_mroute_modevent(module_t mod, int type, void *unused)
2008 MROUTER6_LOCK_INIT();
2012 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
2014 (const struct protosw *)&in6_pim_protosw, NULL);
2015 if (pim6_encap_cookie == NULL) {
2016 printf("ip6_mroute: unable to attach pim6 encap\n");
2017 MIF6_LOCK_DESTROY();
2018 MFC6_LOCK_DESTROY();
2019 MROUTER6_LOCK_DESTROY();
2023 ip6_mforward = X_ip6_mforward;
2024 ip6_mrouter_done = X_ip6_mrouter_done;
2025 ip6_mrouter_get = X_ip6_mrouter_get;
2026 ip6_mrouter_set = X_ip6_mrouter_set;
2027 mrt6_ioctl = X_mrt6_ioctl;
2031 if (V_ip6_mrouter != NULL)
2034 if (pim6_encap_cookie) {
2035 encap_detach(pim6_encap_cookie);
2036 pim6_encap_cookie = NULL;
2038 X_ip6_mrouter_done();
2039 ip6_mforward = NULL;
2040 ip6_mrouter_done = NULL;
2041 ip6_mrouter_get = NULL;
2042 ip6_mrouter_set = NULL;
2045 MIF6_LOCK_DESTROY();
2046 MFC6_LOCK_DESTROY();
2047 MROUTER6_LOCK_DESTROY();
2051 return (EOPNOTSUPP);
2057 static moduledata_t ip6_mroutemod = {
2059 ip6_mroute_modevent,
2063 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);