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"
86 #include "opt_route.h"
88 #include <sys/param.h>
89 #include <sys/callout.h>
90 #include <sys/errno.h>
91 #include <sys/kernel.h>
93 #include <sys/malloc.h>
95 #include <sys/module.h>
96 #include <sys/domain.h>
97 #include <sys/protosw.h>
98 #include <sys/signalvar.h>
99 #include <sys/socket.h>
100 #include <sys/socketvar.h>
101 #include <sys/sockio.h>
103 #include <sys/sysctl.h>
104 #include <sys/syslog.h>
105 #include <sys/systm.h>
106 #include <sys/time.h>
107 #include <sys/vimage.h>
110 #include <net/if_types.h>
111 #include <net/raw_cb.h>
112 #include <net/route.h>
113 #include <net/vnet.h>
115 #include <netinet/in.h>
116 #include <netinet/in_var.h>
117 #include <netinet/icmp6.h>
118 #include <netinet/vinet.h>
119 #include <netinet/ip_encap.h>
121 #include <netinet/ip6.h>
122 #include <netinet6/ip6_var.h>
123 #include <netinet6/scope6_var.h>
124 #include <netinet6/nd6.h>
125 #include <netinet6/ip6_mroute.h>
126 #include <netinet6/ip6protosw.h>
127 #include <netinet6/pim6.h>
128 #include <netinet6/pim6_var.h>
129 #include <netinet6/vinet6.h>
131 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
133 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
134 #define M_HASCL(m) ((m)->m_flags & M_EXT)
136 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
137 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
138 static void pim6_init(void);
139 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
140 static int set_pim6(int *);
141 static int socket_send(struct socket *, struct mbuf *,
142 struct sockaddr_in6 *);
144 extern int in6_mcast_loop;
145 extern struct domain inet6domain;
147 static const struct encaptab *pim6_encap_cookie;
148 static const struct ip6protosw in6_pim_protosw = {
150 .pr_domain = &inet6domain,
151 .pr_protocol = IPPROTO_PIM,
152 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
153 .pr_input = pim6_input,
154 .pr_output = rip6_output,
155 .pr_ctloutput = rip6_ctloutput,
156 .pr_init = pim6_init,
157 .pr_usrreqs = &rip6_usrreqs
159 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
161 #ifdef VIMAGE_GLOBALS
162 static int ip6_mrouter_ver;
165 SYSCTL_DECL(_net_inet6);
166 SYSCTL_DECL(_net_inet6_ip6);
167 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
169 static struct mrt6stat mrt6stat;
170 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
172 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
174 #define NO_RTE_FOUND 0x1
175 #define RTE_FOUND 0x2
177 static struct mtx mrouter6_mtx;
178 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
179 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
180 #define MROUTER6_LOCK_ASSERT() do { \
181 mtx_assert(&mrouter6_mtx, MA_OWNED); \
182 NET_ASSERT_GIANT(); \
184 #define MROUTER6_LOCK_INIT() \
185 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
186 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
188 static struct mf6c *mf6ctable[MF6CTBLSIZ];
189 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
190 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
191 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
192 "netinet6/ip6_mroute.h)");
194 static struct mtx mfc6_mtx;
195 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
196 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
197 #define MFC6_LOCK_ASSERT() do { \
198 mtx_assert(&mfc6_mtx, MA_OWNED); \
199 NET_ASSERT_GIANT(); \
201 #define MFC6_LOCK_INIT() \
202 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
203 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
205 static u_char n6expire[MF6CTBLSIZ];
207 static struct mif6 mif6table[MAXMIFS];
208 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
209 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
210 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
212 static struct mtx mif6_mtx;
213 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
214 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
215 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
216 #define MIF6_LOCK_INIT() \
217 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
218 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
221 #ifdef VIMAGE_GLOBALS
222 static u_int mrt6debug; /* debug level */
224 #define DEBUG_MFC 0x02
225 #define DEBUG_FORWARD 0x04
226 #define DEBUG_EXPIRE 0x08
227 #define DEBUG_XMIT 0x10
228 #define DEBUG_REG 0x20
229 #define DEBUG_PIM 0x40
232 static void expire_upcalls(void *);
233 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
234 #define UPCALL_EXPIRE 6 /* number of timeouts */
237 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
241 * 'Interfaces' associated with decapsulator (so we can tell
242 * packets that went through it from ones that get reflected
243 * by a broken gateway). Different from IPv4 register_if,
244 * these interfaces are linked into the system ifnet list,
245 * because per-interface IPv6 statistics are maintained in
246 * ifp->if_afdata. But it does not have any routes point
247 * to them. I.e., packets can't be sent this way. They
248 * only exist as a placeholder for multicast source
251 static struct ifnet *multicast_register_if6;
253 #define ENCAP_HOPS 64
258 static mifi_t nummifs = 0;
259 static mifi_t reg_mif_num = (mifi_t)-1;
261 static struct pim6stat pim6stat;
262 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
264 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
266 #ifdef VIMAGE_GLOBALS
271 * Hash function for a source, group entry
273 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
274 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
275 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
276 (g).s6_addr32[2] ^ (g).s6_addr32[3])
279 * Find a route for a given origin IPv6 address and Multicast group address.
281 #define MF6CFIND(o, g, rt) do { \
282 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
284 mrt6stat.mrt6s_mfc_lookups++; \
286 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
287 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
288 (_rt->mf6c_stall == NULL)) { \
292 _rt = _rt->mf6c_next; \
295 mrt6stat.mrt6s_mfc_misses++; \
297 } while (/*CONSTCOND*/ 0)
300 * Macros to compute elapsed time efficiently
301 * Borrowed from Van Jacobson's scheduling code
302 * XXX: replace with timersub() ?
304 #define TV_DELTA(a, b, delta) do { \
307 delta = (a).tv_usec - (b).tv_usec; \
308 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
317 delta += (1000000 * xxs); \
320 } while (/*CONSTCOND*/ 0)
322 /* XXX: replace with timercmp(a, b, <) ? */
323 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
324 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
327 #define UPCALL_MAX 50
328 static u_long upcall_data[UPCALL_MAX + 1];
329 static void collate();
330 #endif /* UPCALL_TIMING */
332 static int ip6_mrouter_init(struct socket *, int, int);
333 static int add_m6fc(struct mf6cctl *);
334 static int add_m6if(struct mif6ctl *);
335 static int del_m6fc(struct mf6cctl *);
336 static int del_m6if(mifi_t *);
337 static int del_m6if_locked(mifi_t *);
338 static int get_mif6_cnt(struct sioc_mif_req6 *);
339 static int get_sg_cnt(struct sioc_sg_req6 *);
341 static struct callout expire_upcalls_ch;
343 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
344 int X_ip6_mrouter_done(void);
345 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
346 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
347 int X_mrt6_ioctl(int, caddr_t);
352 INIT_VNET_INET6(curvnet);
354 V_ip6_mrouter_ver = 0;
356 V_mrt6debug = 0; /* debug level */
361 * Handle MRT setsockopt commands to modify the multicast routing tables.
364 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
366 INIT_VNET_INET6(curvnet);
373 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
376 switch (sopt->sopt_name) {
381 error = sooptcopyin(sopt, &optval, sizeof(optval),
385 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
388 error = X_ip6_mrouter_done();
391 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
394 error = add_m6if(&mifc);
397 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
400 error = add_m6fc(&mfcc);
403 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
406 error = del_m6fc(&mfcc);
409 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
412 error = del_m6if(&mifi);
415 error = sooptcopyin(sopt, &optval, sizeof(optval),
419 error = set_pim6(&optval);
430 * Handle MRT getsockopt commands
433 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
435 INIT_VNET_INET6(curvnet);
438 if (so != V_ip6_mrouter)
441 switch (sopt->sopt_name) {
443 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
450 * Handle ioctl commands to obtain information from the cache
453 X_mrt6_ioctl(int cmd, caddr_t data)
460 case SIOCGETSGCNT_IN6:
461 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
464 case SIOCGETMIFCNT_IN6:
465 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
476 * returns the packet, byte, rpf-failure count for the source group provided
479 get_sg_cnt(struct sioc_sg_req6 *req)
488 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
492 req->pktcnt = rt->mf6c_pkt_cnt;
493 req->bytecnt = rt->mf6c_byte_cnt;
494 req->wrong_if = rt->mf6c_wrong_if;
503 * returns the input and output packet and byte counts on the mif provided
506 get_mif6_cnt(struct sioc_mif_req6 *req)
516 if (mifi >= nummifs) {
519 req->icount = mif6table[mifi].m6_pkt_in;
520 req->ocount = mif6table[mifi].m6_pkt_out;
521 req->ibytes = mif6table[mifi].m6_bytes_in;
522 req->obytes = mif6table[mifi].m6_bytes_out;
533 INIT_VNET_INET6(curvnet);
534 if ((*i != 1) && (*i != 0))
543 * Enable multicast routing
546 ip6_mrouter_init(struct socket *so, int v, int cmd)
548 INIT_VNET_INET6(curvnet);
550 V_ip6_mrouter_ver = 0;
557 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
558 so->so_type, so->so_proto->pr_protocol);
561 if (so->so_type != SOCK_RAW ||
562 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
566 return (ENOPROTOOPT);
570 if (V_ip6_mrouter != NULL) {
576 V_ip6_mrouter_ver = cmd;
578 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
579 bzero((caddr_t)n6expire, sizeof(n6expire));
581 V_pim6 = 0;/* used for stubbing out/in pim stuff */
583 callout_init(&expire_upcalls_ch, 0);
584 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
585 expire_upcalls, NULL);
591 log(LOG_DEBUG, "ip6_mrouter_init\n");
598 * Disable IPv6 multicast forwarding.
601 X_ip6_mrouter_done(void)
603 INIT_VNET_INET6(curvnet);
611 if (V_ip6_mrouter == NULL) {
617 * For each phyint in use, disable promiscuous reception of all IPv6
620 for (mifi = 0; mifi < nummifs; mifi++) {
621 if (mif6table[mifi].m6_ifp &&
622 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
623 if_allmulti(mif6table[mifi].m6_ifp, 0);
626 bzero((caddr_t)mif6table, sizeof(mif6table));
629 V_pim6 = 0; /* used to stub out/in pim specific code */
631 callout_stop(&expire_upcalls_ch);
634 * Free all multicast forwarding cache entries.
637 for (i = 0; i < MF6CTBLSIZ; i++) {
642 for (rte = rt->mf6c_stall; rte != NULL; ) {
643 struct rtdetq *n = rte->next;
646 free(rte, M_MRTABLE6);
651 free(frt, M_MRTABLE6);
654 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
658 * Reset register interface
660 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
661 if_detach(multicast_register_if6);
662 if_free(multicast_register_if6);
663 reg_mif_num = (mifi_t)-1;
664 multicast_register_if6 = NULL;
667 V_ip6_mrouter = NULL;
668 V_ip6_mrouter_ver = 0;
674 log(LOG_DEBUG, "ip6_mrouter_done\n");
680 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
683 * Add a mif to the mif table
686 add_m6if(struct mif6ctl *mifcp)
688 INIT_VNET_NET(curvnet);
695 if (mifcp->mif6c_mifi >= MAXMIFS) {
699 mifp = mif6table + mifcp->mif6c_mifi;
700 if (mifp->m6_ifp != NULL) {
702 return (EADDRINUSE); /* XXX: is it appropriate? */
704 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
709 ifp = ifnet_byindex(mifcp->mif6c_pifi);
711 if (mifcp->mif6c_flags & MIFF_REGISTER) {
712 if (reg_mif_num == (mifi_t)-1) {
713 ifp = if_alloc(IFT_OTHER);
715 if_initname(ifp, "register_mif", 0);
716 ifp->if_flags |= IFF_LOOPBACK;
718 multicast_register_if6 = ifp;
719 reg_mif_num = mifcp->mif6c_mifi;
721 * it is impossible to guess the ifindex of the
722 * register interface. So mif6c_pifi is automatically
725 mifcp->mif6c_pifi = ifp->if_index;
727 ifp = multicast_register_if6;
730 /* Make sure the interface supports multicast */
731 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
736 error = if_allmulti(ifp, 1);
743 mifp->m6_flags = mifcp->mif6c_flags;
746 /* initialize per mif pkt counters */
748 mifp->m6_pkt_out = 0;
749 mifp->m6_bytes_in = 0;
750 mifp->m6_bytes_out = 0;
751 bzero(&mifp->m6_route, sizeof(mifp->m6_route));
753 /* Adjust nummifs up if the mifi is higher than nummifs */
754 if (nummifs <= mifcp->mif6c_mifi)
755 nummifs = mifcp->mif6c_mifi + 1;
762 "add_mif #%d, phyint %s\n",
771 * Delete a mif from the mif table
774 del_m6if_locked(mifi_t *mifip)
776 struct mif6 *mifp = mif6table + *mifip;
782 if (*mifip >= nummifs)
784 if (mifp->m6_ifp == NULL)
787 if (!(mifp->m6_flags & MIFF_REGISTER)) {
788 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
792 if (reg_mif_num != (mifi_t)-1 &&
793 multicast_register_if6 != NULL) {
794 if_detach(multicast_register_if6);
795 if_free(multicast_register_if6);
796 reg_mif_num = (mifi_t)-1;
797 multicast_register_if6 = NULL;
801 bzero((caddr_t)mifp, sizeof(*mifp));
803 /* Adjust nummifs down */
804 for (mifi = nummifs; mifi > 0; mifi--)
805 if (mif6table[mifi - 1].m6_ifp)
811 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
818 del_m6if(mifi_t *mifip)
823 cc = del_m6if_locked(mifip);
833 add_m6fc(struct mf6cctl *mfccp)
839 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
843 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
844 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
846 /* If an entry already exists, just update the fields */
849 if (V_mrt6debug & DEBUG_MFC) {
851 "add_m6fc no upcall h %d o %s g %s p %x\n",
852 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
853 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
854 mfccp->mf6cc_parent);
858 rt->mf6c_parent = mfccp->mf6cc_parent;
859 rt->mf6c_ifset = mfccp->mf6cc_ifset;
866 * Find the entry for which the upcall was made and update
868 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
869 mfccp->mf6cc_mcastgrp.sin6_addr);
870 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
871 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
872 &mfccp->mf6cc_origin.sin6_addr) &&
873 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
874 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
875 (rt->mf6c_stall != NULL)) {
879 "add_m6fc: %s o %s g %s p %x dbx %p\n",
880 "multiple kernel entries",
882 &mfccp->mf6cc_origin.sin6_addr),
884 &mfccp->mf6cc_mcastgrp.sin6_addr),
885 mfccp->mf6cc_parent, rt->mf6c_stall);
888 if (V_mrt6debug & DEBUG_MFC)
890 "add_m6fc o %s g %s p %x dbg %x\n",
892 &mfccp->mf6cc_origin.sin6_addr),
894 &mfccp->mf6cc_mcastgrp.sin6_addr),
895 mfccp->mf6cc_parent, rt->mf6c_stall);
898 rt->mf6c_origin = mfccp->mf6cc_origin;
899 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
900 rt->mf6c_parent = mfccp->mf6cc_parent;
901 rt->mf6c_ifset = mfccp->mf6cc_ifset;
902 /* initialize pkt counters per src-grp */
903 rt->mf6c_pkt_cnt = 0;
904 rt->mf6c_byte_cnt = 0;
905 rt->mf6c_wrong_if = 0;
907 rt->mf6c_expire = 0; /* Don't clean this guy up */
910 /* free packets Qed at the end of this entry */
911 for (rte = rt->mf6c_stall; rte != NULL; ) {
912 struct rtdetq *n = rte->next;
913 ip6_mdq(rte->m, rte->ifp, rt);
917 #endif /* UPCALL_TIMING */
918 free(rte, M_MRTABLE6);
921 rt->mf6c_stall = NULL;
926 * It is possible that an entry is being inserted without an upcall
930 if (V_mrt6debug & DEBUG_MFC)
932 "add_mfc no upcall h %d o %s g %s p %x\n",
934 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
935 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
936 mfccp->mf6cc_parent);
939 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
941 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
942 &mfccp->mf6cc_origin.sin6_addr)&&
943 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
944 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
946 rt->mf6c_origin = mfccp->mf6cc_origin;
947 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
948 rt->mf6c_parent = mfccp->mf6cc_parent;
949 rt->mf6c_ifset = mfccp->mf6cc_ifset;
950 /* initialize pkt counters per src-grp */
951 rt->mf6c_pkt_cnt = 0;
952 rt->mf6c_byte_cnt = 0;
953 rt->mf6c_wrong_if = 0;
961 /* no upcall, so make a new entry */
962 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
969 /* insert new entry at head of hash chain */
970 rt->mf6c_origin = mfccp->mf6cc_origin;
971 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
972 rt->mf6c_parent = mfccp->mf6cc_parent;
973 rt->mf6c_ifset = mfccp->mf6cc_ifset;
974 /* initialize pkt counters per src-grp */
975 rt->mf6c_pkt_cnt = 0;
976 rt->mf6c_byte_cnt = 0;
977 rt->mf6c_wrong_if = 0;
979 rt->mf6c_stall = NULL;
981 /* link into table */
982 rt->mf6c_next = mf6ctable[hash];
983 mf6ctable[hash] = rt;
993 * collect delay statistics on the upcalls
996 collate(struct timeval *t)
1006 TV_DELTA(tp, *t, delta);
1015 #endif /* UPCALL_TIMING */
1018 * Delete an mfc entry
1021 del_m6fc(struct mf6cctl *mfccp)
1023 struct sockaddr_in6 origin;
1024 struct sockaddr_in6 mcastgrp;
1029 origin = mfccp->mf6cc_origin;
1030 mcastgrp = mfccp->mf6cc_mcastgrp;
1031 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1034 if (V_mrt6debug & DEBUG_MFC) {
1035 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1036 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
1037 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1038 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1044 nptr = &mf6ctable[hash];
1045 while ((rt = *nptr) != NULL) {
1046 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1047 &rt->mf6c_origin.sin6_addr) &&
1048 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1049 &rt->mf6c_mcastgrp.sin6_addr) &&
1050 rt->mf6c_stall == NULL)
1053 nptr = &rt->mf6c_next;
1057 return (EADDRNOTAVAIL);
1060 *nptr = rt->mf6c_next;
1061 free(rt, M_MRTABLE6);
1069 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1073 if (sbappendaddr(&s->so_rcv,
1074 (struct sockaddr *)src,
1075 mm, (struct mbuf *)0) != 0) {
1085 * IPv6 multicast forwarding function. This function assumes that the packet
1086 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1087 * pointed to by "ifp", and the packet is to be relayed to other networks
1088 * that have members of the packet's destination IPv6 multicast group.
1090 * The packet is returned unscathed to the caller, unless it is
1091 * erroneous, in which case a non-zero return value tells the caller to
1094 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1095 * this function is called in the originating context (i.e., not when
1096 * forwarding a packet from other node). ip6_output(), which is currently the
1097 * only function that calls this function is called in the originating context,
1098 * explicitly ensures this condition. It is caller's responsibility to ensure
1099 * that if this function is called from somewhere else in the originating
1100 * context in the future.
1103 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1105 INIT_VNET_INET6(curvnet);
1110 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1113 if (V_mrt6debug & DEBUG_FORWARD)
1114 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
1115 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1116 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1121 * Don't forward a packet with Hop limit of zero or one,
1122 * or a packet destined to a local-only group.
1124 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1125 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1130 * Source address check: do not forward packets with unspecified
1131 * source. It was discussed in July 2000, on ipngwg mailing list.
1132 * This is rather more serious than unicast cases, because some
1133 * MLD packets can be sent with the unspecified source address
1134 * (although such packets must normally set 1 to the hop limit field).
1136 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1137 V_ip6stat.ip6s_cantforward++;
1138 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
1139 V_ip6_log_time = time_second;
1142 "from %s to %s nxt %d received on %s\n",
1143 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1144 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1146 if_name(m->m_pkthdr.rcvif));
1154 * Determine forwarding mifs from the forwarding cache table
1156 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1158 /* Entry exists, so forward if necessary */
1161 return (ip6_mdq(m, ifp, rt));
1164 * If we don't have a route for packet's origin,
1165 * Make a copy of the packet &
1166 * send message to routing daemon
1173 #ifdef UPCALL_TIMING
1177 #endif /* UPCALL_TIMING */
1179 mrt6stat.mrt6s_no_route++;
1181 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1182 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1183 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1184 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1188 * Allocate mbufs early so that we don't do extra work if we
1189 * are just going to fail anyway.
1191 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
1197 mb0 = m_copy(m, 0, M_COPYALL);
1199 * Pullup packet header if needed before storing it,
1200 * as other references may modify it in the meantime.
1203 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1204 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1206 free(rte, M_MRTABLE6);
1211 /* is there an upcall waiting for this packet? */
1212 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1213 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1214 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1215 &rt->mf6c_origin.sin6_addr) &&
1216 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1217 &rt->mf6c_mcastgrp.sin6_addr) &&
1218 (rt->mf6c_stall != NULL))
1225 struct omrt6msg *oim;
1228 /* no upcall, so make a new entry */
1229 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
1232 free(rte, M_MRTABLE6);
1238 * Make a copy of the header to send to the user
1241 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1244 free(rte, M_MRTABLE6);
1246 free(rt, M_MRTABLE6);
1252 * Send message to routing daemon
1254 sin6.sin6_addr = ip6->ip6_src;
1260 switch (V_ip6_mrouter_ver) {
1263 oim = mtod(mm, struct omrt6msg *);
1264 oim->im6_msgtype = MRT6MSG_NOCACHE;
1269 im = mtod(mm, struct mrt6msg *);
1270 im->im6_msgtype = MRT6MSG_NOCACHE;
1274 free(rte, M_MRTABLE6);
1276 free(rt, M_MRTABLE6);
1282 if (V_mrt6debug & DEBUG_FORWARD)
1284 "getting the iif info in the kernel\n");
1287 for (mifp = mif6table, mifi = 0;
1288 mifi < nummifs && mifp->m6_ifp != ifp;
1292 switch (V_ip6_mrouter_ver) {
1295 oim->im6_mif = mifi;
1303 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1304 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1305 "socket queue full\n");
1306 mrt6stat.mrt6s_upq_sockfull++;
1307 free(rte, M_MRTABLE6);
1309 free(rt, M_MRTABLE6);
1314 mrt6stat.mrt6s_upcalls++;
1316 /* insert new entry at head of hash chain */
1317 bzero(rt, sizeof(*rt));
1318 rt->mf6c_origin.sin6_family = AF_INET6;
1319 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1320 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1321 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1322 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1323 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1324 rt->mf6c_expire = UPCALL_EXPIRE;
1326 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1328 /* link into table */
1329 rt->mf6c_next = mf6ctable[hash];
1330 mf6ctable[hash] = rt;
1331 /* Add this entry to the end of the queue */
1332 rt->mf6c_stall = rte;
1334 /* determine if q has overflowed */
1338 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1339 if (++npkts > MAX_UPQ6) {
1340 mrt6stat.mrt6s_upq_ovflw++;
1341 free(rte, M_MRTABLE6);
1347 /* Add this entry to the end of the queue */
1354 #ifdef UPCALL_TIMING
1356 #endif /* UPCALL_TIMING */
1365 * Clean up cache entries if upcalls are not serviced
1366 * Call from the Slow Timeout mechanism, every half second.
1369 expire_upcalls(void *unused)
1372 struct mf6c *mfc, **nptr;
1376 for (i = 0; i < MF6CTBLSIZ; i++) {
1377 if (n6expire[i] == 0)
1379 nptr = &mf6ctable[i];
1380 while ((mfc = *nptr) != NULL) {
1381 rte = mfc->mf6c_stall;
1383 * Skip real cache entries
1384 * Make sure it wasn't marked to not expire (shouldn't happen)
1388 mfc->mf6c_expire != 0 &&
1389 --mfc->mf6c_expire == 0) {
1391 if (V_mrt6debug & DEBUG_EXPIRE) {
1392 char ip6bufo[INET6_ADDRSTRLEN];
1393 char ip6bufg[INET6_ADDRSTRLEN];
1394 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1395 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1396 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1400 * drop all the packets
1401 * free the mbuf with the pkt, if, timing info
1404 struct rtdetq *n = rte->next;
1406 free(rte, M_MRTABLE6);
1408 } while (rte != NULL);
1409 mrt6stat.mrt6s_cache_cleanups++;
1412 *nptr = mfc->mf6c_next;
1413 free(mfc, M_MRTABLE6);
1415 nptr = &mfc->mf6c_next;
1420 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1421 expire_upcalls, NULL);
1425 * Packet forwarding routine once entry in the cache is made
1428 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1430 INIT_VNET_INET6(curvnet);
1431 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1434 int plen = m->m_pkthdr.len;
1435 struct in6_addr src0, dst0; /* copies for local work */
1436 u_int32_t iszone, idzone, oszone, odzone;
1440 * Macro to send packet on mif. Since RSVP packets don't get counted on
1441 * input, they shouldn't get counted on output, so statistics keeping is
1445 #define MC6_SEND(ip6, mifp, m) do { \
1446 if ((mifp)->m6_flags & MIFF_REGISTER) \
1447 register_send((ip6), (mifp), (m)); \
1449 phyint_send((ip6), (mifp), (m)); \
1450 } while (/*CONSTCOND*/ 0)
1453 * Don't forward if it didn't arrive from the parent mif
1456 mifi = rt->mf6c_parent;
1457 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1458 /* came in the wrong interface */
1460 if (V_mrt6debug & DEBUG_FORWARD)
1462 "wrong if: ifid %d mifi %d mififid %x\n",
1463 ifp->if_index, mifi,
1464 mif6table[mifi].m6_ifp->if_index);
1466 mrt6stat.mrt6s_wrong_if++;
1467 rt->mf6c_wrong_if++;
1469 * If we are doing PIM processing, and we are forwarding
1470 * packets on this interface, send a message to the
1473 /* have to make sure this is a valid mif */
1474 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1475 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1477 * Check the M_LOOP flag to avoid an
1478 * unnecessary PIM assert.
1479 * XXX: M_LOOP is an ad-hoc hack...
1481 static struct sockaddr_in6 sin6 =
1482 { sizeof(sin6), AF_INET6 };
1487 struct omrt6msg *oim;
1490 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1493 mm->m_len < sizeof(struct ip6_hdr)))
1494 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1502 switch (V_ip6_mrouter_ver) {
1505 oim = mtod(mm, struct omrt6msg *);
1506 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1511 im = mtod(mm, struct mrt6msg *);
1512 im->im6_msgtype = MRT6MSG_WRONGMIF;
1520 for (mifp = mif6table, iif = 0;
1521 iif < nummifs && mifp &&
1522 mifp->m6_ifp != ifp;
1526 switch (V_ip6_mrouter_ver) {
1530 sin6.sin6_addr = oim->im6_src;
1535 sin6.sin6_addr = im->im6_src;
1539 mrt6stat.mrt6s_upcalls++;
1541 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1544 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1546 ++mrt6stat.mrt6s_upq_sockfull;
1548 } /* if socket Q full */
1551 } /* if wrong iif */
1553 /* If I sourced this packet, it counts as output, else it was input. */
1554 if (m->m_pkthdr.rcvif == NULL) {
1555 /* XXX: is rcvif really NULL when output?? */
1556 mif6table[mifi].m6_pkt_out++;
1557 mif6table[mifi].m6_bytes_out += plen;
1559 mif6table[mifi].m6_pkt_in++;
1560 mif6table[mifi].m6_bytes_in += plen;
1563 rt->mf6c_byte_cnt += plen;
1566 * For each mif, forward a copy of the packet if there are group
1567 * members downstream on the interface.
1569 src0 = ip6->ip6_src;
1570 dst0 = ip6->ip6_dst;
1571 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1572 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1573 V_ip6stat.ip6s_badscope++;
1576 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1577 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1579 * check if the outgoing packet is going to break
1581 * XXX For packets through PIM register tunnel
1582 * interface, we believe a routing daemon.
1584 if (!(mif6table[rt->mf6c_parent].m6_flags &
1586 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1587 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1589 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1593 V_ip6stat.ip6s_badscope++;
1599 mifp->m6_bytes_out += plen;
1600 MC6_SEND(ip6, mifp, m);
1607 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1609 INIT_VNET_INET6(curvnet);
1610 struct mbuf *mb_copy;
1611 struct ifnet *ifp = mifp->m6_ifp;
1613 struct sockaddr_in6 *dst6;
1616 dst6 = &mifp->m6_route.ro_dst;
1619 * Make a new reference to the packet; make sure that
1620 * the IPv6 header is actually copied, not just referenced,
1621 * so that ip6_output() only scribbles on the copy.
1623 mb_copy = m_copy(m, 0, M_COPYALL);
1625 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1626 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1627 if (mb_copy == NULL) {
1630 /* set MCAST flag to the outgoing packet */
1631 mb_copy->m_flags |= M_MCAST;
1634 * If we sourced the packet, call ip6_output since we may devide
1635 * the packet into fragments when the packet is too big for the
1636 * outgoing interface.
1637 * Otherwise, we can simply send the packet to the interface
1640 if (m->m_pkthdr.rcvif == NULL) {
1641 struct ip6_moptions im6o;
1643 im6o.im6o_multicast_ifp = ifp;
1644 /* XXX: ip6_output will override ip6->ip6_hlim */
1645 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1646 im6o.im6o_multicast_loop = 1;
1647 error = ip6_output(mb_copy, NULL, &mifp->m6_route,
1648 IPV6_FORWARDING, &im6o, NULL, NULL);
1651 if (V_mrt6debug & DEBUG_XMIT)
1652 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1653 mifp - mif6table, error);
1659 * If configured to loop back multicasts by default,
1660 * loop back a copy now.
1662 if (in6_mcast_loop) {
1663 dst6->sin6_len = sizeof(struct sockaddr_in6);
1664 dst6->sin6_family = AF_INET6;
1665 dst6->sin6_addr = ip6->ip6_dst;
1666 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst);
1670 * Put the packet into the sending queue of the outgoing interface
1671 * if it would fit in the MTU of the interface.
1673 linkmtu = IN6_LINKMTU(ifp);
1674 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1675 dst6->sin6_len = sizeof(struct sockaddr_in6);
1676 dst6->sin6_family = AF_INET6;
1677 dst6->sin6_addr = ip6->ip6_dst;
1679 * We just call if_output instead of nd6_output here, since
1680 * we need no ND for a multicast forwarded packet...right?
1682 error = (*ifp->if_output)(ifp, mb_copy,
1683 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL);
1685 if (V_mrt6debug & DEBUG_XMIT)
1686 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1687 mifp - mif6table, error);
1691 * pMTU discovery is intentionally disabled by default, since
1692 * various router may notify pMTU in multicast, which can be
1693 * a DDoS to a router
1695 if (V_ip6_mcast_pmtu)
1696 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1699 if (V_mrt6debug & DEBUG_XMIT) {
1700 char ip6bufs[INET6_ADDRSTRLEN];
1701 char ip6bufd[INET6_ADDRSTRLEN];
1703 "phyint_send: packet too big on %s o %s "
1704 "g %s size %d(discarded)\n",
1706 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1707 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1708 mb_copy->m_pkthdr.len);
1710 #endif /* MRT6DEBUG */
1711 m_freem(mb_copy); /* simply discard the packet */
1717 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1719 INIT_VNET_INET6(curvnet);
1721 int i, len = m->m_pkthdr.len;
1722 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1723 struct mrt6msg *im6;
1727 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1728 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1729 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1730 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1733 ++pim6stat.pim6s_snd_registers;
1735 /* Make a copy of the packet to send to the user level process */
1736 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1739 mm->m_pkthdr.rcvif = NULL;
1740 mm->m_data += max_linkhdr;
1741 mm->m_len = sizeof(struct ip6_hdr);
1743 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1747 i = MHLEN - M_LEADINGSPACE(mm);
1750 mm = m_pullup(mm, i);
1753 /* TODO: check it! */
1754 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1757 * Send message to routing daemon
1759 sin6.sin6_addr = ip6->ip6_src;
1761 im6 = mtod(mm, struct mrt6msg *);
1762 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1765 im6->im6_mif = mif - mif6table;
1767 /* iif info is not given for reg. encap.n */
1768 mrt6stat.mrt6s_upcalls++;
1770 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1774 "register_send: ip6_mrouter socket queue full\n");
1776 ++mrt6stat.mrt6s_upq_sockfull;
1783 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1784 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1788 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1792 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1794 if (proto != IPPROTO_PIM)
1795 return 0; /* not for us; reject the datagram. */
1797 return 64; /* claim the datagram. */
1801 * PIM sparse mode hook
1802 * Receives the pim control messages, and passes them up to the listening
1803 * socket, using rip6_input.
1804 * The only message processed is the REGISTER pim message; the pim header
1805 * is stripped off, and the inner packet is passed to register_mforward.
1808 pim6_input(struct mbuf **mp, int *offp, int proto)
1810 INIT_VNET_INET6(curvnet);
1811 struct pim *pim; /* pointer to a pim struct */
1812 struct ip6_hdr *ip6;
1814 struct mbuf *m = *mp;
1818 ++pim6stat.pim6s_rcv_total;
1820 ip6 = mtod(m, struct ip6_hdr *);
1821 pimlen = m->m_pkthdr.len - *offp;
1826 if (pimlen < PIM_MINLEN) {
1827 ++pim6stat.pim6s_rcv_tooshort;
1829 if (V_mrt6debug & DEBUG_PIM)
1830 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1833 return (IPPROTO_DONE);
1837 * if the packet is at least as big as a REGISTER, go ahead
1838 * and grab the PIM REGISTER header size, to avoid another
1839 * possible m_pullup() later.
1841 * PIM_MINLEN == pimhdr + u_int32 == 8
1842 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1844 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1847 * Make sure that the IP6 and PIM headers in contiguous memory, and
1848 * possibly the PIM REGISTER header
1850 #ifndef PULLDOWN_TEST
1851 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1852 /* adjust pointer */
1853 ip6 = mtod(m, struct ip6_hdr *);
1855 /* adjust mbuf to point to the PIM header */
1856 pim = (struct pim *)((caddr_t)ip6 + off);
1858 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1860 pim6stat.pim6s_rcv_tooshort++;
1861 return (IPPROTO_DONE);
1865 #define PIM6_CHECKSUM
1866 #ifdef PIM6_CHECKSUM
1871 * Validate checksum.
1872 * If PIM REGISTER, exclude the data packet
1874 if (pim->pim_type == PIM_REGISTER)
1875 cksumlen = PIM_MINLEN;
1879 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1880 ++pim6stat.pim6s_rcv_badsum;
1882 if (V_mrt6debug & DEBUG_PIM)
1884 "pim6_input: invalid checksum\n");
1887 return (IPPROTO_DONE);
1890 #endif /* PIM_CHECKSUM */
1892 /* PIM version check */
1893 if (pim->pim_ver != PIM_VERSION) {
1894 ++pim6stat.pim6s_rcv_badversion;
1897 "pim6_input: incorrect version %d, expecting %d\n",
1898 pim->pim_ver, PIM_VERSION);
1901 return (IPPROTO_DONE);
1904 if (pim->pim_type == PIM_REGISTER) {
1906 * since this is a REGISTER, we'll make a copy of the register
1907 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1910 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1913 struct ip6_hdr *eip6;
1917 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1920 ++pim6stat.pim6s_rcv_registers;
1922 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1924 if (V_mrt6debug & DEBUG_PIM)
1926 "pim6_input: register mif not set: %d\n",
1930 return (IPPROTO_DONE);
1933 reghdr = (u_int32_t *)(pim + 1);
1935 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1936 goto pim6_input_to_daemon;
1941 if (pimlen < PIM6_REG_MINLEN) {
1942 ++pim6stat.pim6s_rcv_tooshort;
1943 ++pim6stat.pim6s_rcv_badregisters;
1946 "pim6_input: register packet size too "
1947 "small %d from %s\n",
1948 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1951 return (IPPROTO_DONE);
1954 eip6 = (struct ip6_hdr *) (reghdr + 1);
1956 if (V_mrt6debug & DEBUG_PIM)
1958 "pim6_input[register], eip6: %s -> %s, "
1960 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1961 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1962 ntohs(eip6->ip6_plen));
1965 /* verify the version number of the inner packet */
1966 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1967 ++pim6stat.pim6s_rcv_badregisters;
1969 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1970 "of the inner packet\n",
1971 (eip6->ip6_vfc & IPV6_VERSION));
1974 return (IPPROTO_NONE);
1977 /* verify the inner packet is destined to a mcast group */
1978 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1979 ++pim6stat.pim6s_rcv_badregisters;
1981 if (V_mrt6debug & DEBUG_PIM)
1983 "pim6_input: inner packet of register "
1984 "is not multicast %s\n",
1985 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1988 return (IPPROTO_DONE);
1992 * make a copy of the whole header to pass to the daemon later.
1994 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1998 "pim6_input: pim register: "
1999 "could not copy register head\n");
2002 return (IPPROTO_DONE);
2006 * forward the inner ip6 packet; point m_data at the inner ip6.
2008 m_adj(m, off + PIM_MINLEN);
2010 if (V_mrt6debug & DEBUG_PIM) {
2012 "pim6_input: forwarding decapsulated register: "
2013 "src %s, dst %s, mif %d\n",
2014 ip6_sprintf(ip6bufs, &eip6->ip6_src),
2015 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
2020 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
2021 dst.sin6_family, 0);
2023 /* prepare the register head to send to the mrouting daemon */
2028 * Pass the PIM message up to the daemon; if it is a register message
2029 * pass the 'head' only up to the daemon. This includes the
2030 * encapsulator ip6 header, pim header, register header and the
2031 * encapsulated ip6 header.
2033 pim6_input_to_daemon:
2034 rip6_input(&m, offp, proto);
2035 return (IPPROTO_DONE);
2039 ip6_mroute_modevent(module_t mod, int type, void *unused)
2041 INIT_VNET_INET6(curvnet);
2045 MROUTER6_LOCK_INIT();
2049 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
2051 (const struct protosw *)&in6_pim_protosw, NULL);
2052 if (pim6_encap_cookie == NULL) {
2053 printf("ip6_mroute: unable to attach pim6 encap\n");
2054 MIF6_LOCK_DESTROY();
2055 MFC6_LOCK_DESTROY();
2056 MROUTER6_LOCK_DESTROY();
2060 ip6_mforward = X_ip6_mforward;
2061 ip6_mrouter_done = X_ip6_mrouter_done;
2062 ip6_mrouter_get = X_ip6_mrouter_get;
2063 ip6_mrouter_set = X_ip6_mrouter_set;
2064 mrt6_ioctl = X_mrt6_ioctl;
2068 if (V_ip6_mrouter != NULL)
2071 if (pim6_encap_cookie) {
2072 encap_detach(pim6_encap_cookie);
2073 pim6_encap_cookie = NULL;
2075 X_ip6_mrouter_done();
2076 ip6_mforward = NULL;
2077 ip6_mrouter_done = NULL;
2078 ip6_mrouter_get = NULL;
2079 ip6_mrouter_set = NULL;
2082 MIF6_LOCK_DESTROY();
2083 MFC6_LOCK_DESTROY();
2084 MROUTER6_LOCK_DESTROY();
2088 return (EOPNOTSUPP);
2094 static moduledata_t ip6_mroutemod = {
2096 ip6_mroute_modevent,
2100 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);