2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
35 * Copyright (c) 1989 Stephen Deering
36 * Copyright (c) 1992, 1993
37 * The Regents of the University of California. All rights reserved.
39 * This code is derived from software contributed to Berkeley by
40 * Stephen Deering of Stanford University.
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 3. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
67 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
71 * IP multicast forwarding procedures
73 * Written by David Waitzman, BBN Labs, August 1988.
74 * Modified by Steve Deering, Stanford, February 1989.
75 * Modified by Mark J. Steiglitz, Stanford, May, 1991
76 * Modified by Van Jacobson, LBL, January 1993
77 * Modified by Ajit Thyagarajan, PARC, August 1993
78 * Modified by Bill Fenner, PARC, April 1994
80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
83 #include <sys/cdefs.h>
84 __FBSDID("$FreeBSD$");
86 #include "opt_inet6.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>
99 #include <sys/signalvar.h>
100 #include <sys/socket.h>
101 #include <sys/socketvar.h>
102 #include <sys/sockio.h>
104 #include <sys/sysctl.h>
105 #include <sys/syslog.h>
106 #include <sys/systm.h>
107 #include <sys/time.h>
110 #include <net/if_var.h>
111 #include <net/if_types.h>
112 #include <net/vnet.h>
114 #include <netinet/in.h>
115 #include <netinet/in_var.h>
116 #include <netinet/icmp6.h>
117 #include <netinet/ip_encap.h>
119 #include <netinet/ip6.h>
120 #include <netinet/in_kdtrace.h>
121 #include <netinet6/ip6_var.h>
122 #include <netinet6/scope6_var.h>
123 #include <netinet6/nd6.h>
124 #include <netinet6/ip6_mroute.h>
125 #include <netinet6/pim6.h>
126 #include <netinet6/pim6_var.h>
128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
130 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
131 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
132 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
133 static int set_pim6(int *);
134 static int socket_send(struct socket *, struct mbuf *,
135 struct sockaddr_in6 *);
137 extern int in6_mcast_loop;
138 extern struct domain inet6domain;
140 static const struct encaptab *pim6_encap_cookie;
141 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
142 static int pim6_input(struct mbuf *, int, int, void *);
144 static const struct encap_config ipv6_encap_cfg = {
145 .proto = IPPROTO_PIM,
146 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN,
148 .check = pim6_encapcheck,
152 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
153 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
155 SYSCTL_DECL(_net_inet6);
156 SYSCTL_DECL(_net_inet6_ip6);
157 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
158 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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 MRT6STAT_INC(name) mrt6stat.name += 1
167 #define NO_RTE_FOUND 0x1
168 #define RTE_FOUND 0x2
170 static struct sx mrouter6_mtx;
171 #define MROUTER6_LOCKPTR() (&mrouter6_mtx)
172 #define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR())
173 #define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR())
174 #define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED
175 #define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6")
176 #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR())
178 static struct mf6c *mf6ctable[MF6CTBLSIZ];
179 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
180 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
181 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
182 "netinet6/ip6_mroute.h)");
184 static struct mtx mfc6_mtx;
185 #define MFC6_LOCKPTR() (&mfc6_mtx)
186 #define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR())
187 #define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR())
188 #define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED)
189 #define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \
190 "IPv6 multicast forwarding cache", \
192 #define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR())
194 static u_char n6expire[MF6CTBLSIZ];
196 static struct mif6 mif6table[MAXMIFS];
198 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
200 struct mif6_sctl *out;
203 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
205 for (int i = 0; i < MAXMIFS; i++) {
206 out[i].m6_flags = mif6table[i].m6_flags;
207 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
208 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
209 if (mif6table[i].m6_ifp != NULL)
210 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
213 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
214 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
215 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
216 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
218 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
222 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
223 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
224 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
225 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
226 "netinet6/ip6_mroute.h)");
228 static struct mtx mif6_mtx;
229 #define MIF6_LOCKPTR() (&mif6_mtx)
230 #define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR())
231 #define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR())
232 #define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED)
233 #define MIF6_LOCK_INIT() \
234 mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF)
235 #define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR())
238 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
239 #define V_mrt6debug VNET(mrt6debug)
240 #define DEBUG_MFC 0x02
241 #define DEBUG_FORWARD 0x04
242 #define DEBUG_EXPIRE 0x08
243 #define DEBUG_XMIT 0x10
244 #define DEBUG_REG 0x20
245 #define DEBUG_PIM 0x40
246 #define DEBUG_ERR 0x80
247 #define DEBUG_ANY 0x7f
248 #define MRT6_DLOG(m, fmt, ...) \
249 if (V_mrt6debug & (m)) \
250 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
251 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
253 #define MRT6_DLOG(m, fmt, ...)
256 static void expire_upcalls(void *);
257 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
258 #define UPCALL_EXPIRE 6 /* number of timeouts */
261 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
265 * 'Interfaces' associated with decapsulator (so we can tell
266 * packets that went through it from ones that get reflected
267 * by a broken gateway). Different from IPv4 register_if,
268 * these interfaces are linked into the system ifnet list,
269 * because per-interface IPv6 statistics are maintained in
270 * ifp->if_afdata. But it does not have any routes point
271 * to them. I.e., packets can't be sent this way. They
272 * only exist as a placeholder for multicast source
275 static struct ifnet *multicast_register_if6;
277 #define ENCAP_HOPS 64
282 static mifi_t nummifs = 0;
283 static mifi_t reg_mif_num = (mifi_t)-1;
285 static struct pim6stat pim6stat;
286 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
288 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
290 #define PIM6STAT_INC(name) pim6stat.name += 1
291 VNET_DEFINE_STATIC(int, pim6);
292 #define V_pim6 VNET(pim6)
295 * Hash function for a source, group entry
297 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
298 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
299 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
300 (g).s6_addr32[2] ^ (g).s6_addr32[3])
303 * Find a route for a given origin IPv6 address and Multicast group address.
305 #define MF6CFIND(o, g, rt) do { \
306 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
309 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
310 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
311 (_rt->mf6c_stall == NULL)) { \
315 _rt = _rt->mf6c_next; \
318 MRT6STAT_INC(mrt6s_mfc_misses); \
320 } while (/*CONSTCOND*/ 0)
323 * Macros to compute elapsed time efficiently
324 * Borrowed from Van Jacobson's scheduling code
325 * XXX: replace with timersub() ?
327 #define TV_DELTA(a, b, delta) do { \
330 delta = (a).tv_usec - (b).tv_usec; \
331 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
340 delta += (1000000 * xxs); \
343 } while (/*CONSTCOND*/ 0)
345 /* XXX: replace with timercmp(a, b, <) ? */
346 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
347 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
350 #define UPCALL_MAX 50
351 static u_long upcall_data[UPCALL_MAX + 1];
352 static void collate();
353 #endif /* UPCALL_TIMING */
355 static int ip6_mrouter_init(struct socket *, int, int);
356 static int add_m6fc(struct mf6cctl *);
357 static int add_m6if(struct mif6ctl *);
358 static int del_m6fc(struct mf6cctl *);
359 static int del_m6if(mifi_t *);
360 static int del_m6if_locked(mifi_t *);
361 static int get_mif6_cnt(struct sioc_mif_req6 *);
362 static int get_sg_cnt(struct sioc_sg_req6 *);
364 static struct callout expire_upcalls_ch;
366 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
367 int X_ip6_mrouter_done(void);
368 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
369 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
370 int X_mrt6_ioctl(u_long, caddr_t);
373 * Handle MRT setsockopt commands to modify the multicast routing tables.
376 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
384 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
387 switch (sopt->sopt_name) {
392 error = sooptcopyin(sopt, &optval, sizeof(optval),
396 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
399 error = X_ip6_mrouter_done();
402 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
405 error = add_m6if(&mifc);
408 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
411 error = add_m6fc(&mfcc);
414 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
417 error = del_m6fc(&mfcc);
420 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
423 error = del_m6if(&mifi);
426 error = sooptcopyin(sopt, &optval, sizeof(optval),
430 error = set_pim6(&optval);
441 * Handle MRT getsockopt commands
444 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
448 if (so != V_ip6_mrouter)
451 switch (sopt->sopt_name) {
453 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
460 * Handle ioctl commands to obtain information from the cache
463 X_mrt6_ioctl(u_long cmd, caddr_t data)
470 case SIOCGETSGCNT_IN6:
471 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
474 case SIOCGETMIFCNT_IN6:
475 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
486 * returns the packet, byte, rpf-failure count for the source group provided
489 get_sg_cnt(struct sioc_sg_req6 *req)
498 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
502 req->pktcnt = rt->mf6c_pkt_cnt;
503 req->bytecnt = rt->mf6c_byte_cnt;
504 req->wrong_if = rt->mf6c_wrong_if;
513 * returns the input and output packet and byte counts on the mif provided
516 get_mif6_cnt(struct sioc_mif_req6 *req)
526 if (mifi >= nummifs) {
529 req->icount = mif6table[mifi].m6_pkt_in;
530 req->ocount = mif6table[mifi].m6_pkt_out;
531 req->ibytes = mif6table[mifi].m6_bytes_in;
532 req->obytes = mif6table[mifi].m6_bytes_out;
543 if ((*i != 1) && (*i != 0))
552 * Enable multicast routing
555 ip6_mrouter_init(struct socket *so, int v, int cmd)
558 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
559 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_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0);
584 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
585 expire_upcalls, NULL);
589 MRT6_DLOG(DEBUG_ANY, "finished");
595 * Disable IPv6 multicast forwarding.
598 X_ip6_mrouter_done(void)
607 if (V_ip6_mrouter == NULL) {
613 * For each phyint in use, disable promiscuous reception of all IPv6
616 for (mifi = 0; mifi < nummifs; mifi++) {
617 if (mif6table[mifi].m6_ifp &&
618 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
619 if_allmulti(mif6table[mifi].m6_ifp, 0);
622 bzero((caddr_t)mif6table, sizeof(mif6table));
625 V_pim6 = 0; /* used to stub out/in pim specific code */
628 * Free all multicast forwarding cache entries.
631 for (i = 0; i < MF6CTBLSIZ; i++) {
636 for (rte = rt->mf6c_stall; rte != NULL; ) {
637 struct rtdetq *n = rte->next;
640 free(rte, M_MRTABLE6);
645 free(frt, M_MRTABLE6);
648 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
651 callout_drain(&expire_upcalls_ch);
654 * Reset register interface
656 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
657 if_detach(multicast_register_if6);
658 if_free(multicast_register_if6);
659 reg_mif_num = (mifi_t)-1;
660 multicast_register_if6 = NULL;
663 V_ip6_mrouter = NULL;
664 V_ip6_mrouter_ver = 0;
667 MRT6_DLOG(DEBUG_ANY, "finished");
672 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
675 * Add a mif to the mif table
678 add_m6if(struct mif6ctl *mifcp)
680 struct epoch_tracker et;
687 if (mifcp->mif6c_mifi >= MAXMIFS) {
691 mifp = mif6table + mifcp->mif6c_mifi;
692 if (mifp->m6_ifp != NULL) {
694 return (EADDRINUSE); /* XXX: is it appropriate? */
698 if ((ifp = ifnet_byindex(mifcp->mif6c_pifi)) == NULL) {
703 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */
705 if (mifcp->mif6c_flags & MIFF_REGISTER) {
706 if (reg_mif_num == (mifi_t)-1) {
707 ifp = if_alloc(IFT_OTHER);
709 if_initname(ifp, "register_mif", 0);
710 ifp->if_flags |= IFF_LOOPBACK;
712 multicast_register_if6 = ifp;
713 reg_mif_num = mifcp->mif6c_mifi;
715 * it is impossible to guess the ifindex of the
716 * register interface. So mif6c_pifi is automatically
719 mifcp->mif6c_pifi = ifp->if_index;
721 ifp = multicast_register_if6;
724 /* Make sure the interface supports multicast */
725 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
730 error = if_allmulti(ifp, 1);
737 mifp->m6_flags = mifcp->mif6c_flags;
740 /* initialize per mif pkt counters */
742 mifp->m6_pkt_out = 0;
743 mifp->m6_bytes_in = 0;
744 mifp->m6_bytes_out = 0;
746 /* Adjust nummifs up if the mifi is higher than nummifs */
747 if (nummifs <= mifcp->mif6c_mifi)
748 nummifs = mifcp->mif6c_mifi + 1;
751 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
758 * Delete a mif from the mif table
761 del_m6if_locked(mifi_t *mifip)
763 struct mif6 *mifp = mif6table + *mifip;
769 if (*mifip >= nummifs)
771 if (mifp->m6_ifp == NULL)
774 if (!(mifp->m6_flags & MIFF_REGISTER)) {
775 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
779 if (reg_mif_num != (mifi_t)-1 &&
780 multicast_register_if6 != NULL) {
781 if_detach(multicast_register_if6);
782 if_free(multicast_register_if6);
783 reg_mif_num = (mifi_t)-1;
784 multicast_register_if6 = NULL;
788 bzero((caddr_t)mifp, sizeof(*mifp));
790 /* Adjust nummifs down */
791 for (mifi = nummifs; mifi > 0; mifi--)
792 if (mif6table[mifi - 1].m6_ifp)
795 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
801 del_m6if(mifi_t *mifip)
806 cc = del_m6if_locked(mifip);
816 add_m6fc(struct mf6cctl *mfccp)
822 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
826 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
827 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
829 /* If an entry already exists, just update the fields */
831 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
832 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
833 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
834 mfccp->mf6cc_parent);
836 rt->mf6c_parent = mfccp->mf6cc_parent;
837 rt->mf6c_ifset = mfccp->mf6cc_ifset;
844 * Find the entry for which the upcall was made and update
846 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
847 mfccp->mf6cc_mcastgrp.sin6_addr);
848 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
849 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
850 &mfccp->mf6cc_origin.sin6_addr) &&
851 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
852 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
853 (rt->mf6c_stall != NULL)) {
856 "add_m6fc: %s o %s g %s p %x dbx %p\n",
857 "multiple kernel entries",
859 &mfccp->mf6cc_origin.sin6_addr),
861 &mfccp->mf6cc_mcastgrp.sin6_addr),
862 mfccp->mf6cc_parent, rt->mf6c_stall);
864 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
866 &mfccp->mf6cc_origin.sin6_addr),
868 &mfccp->mf6cc_mcastgrp.sin6_addr),
869 mfccp->mf6cc_parent, rt->mf6c_stall);
871 rt->mf6c_origin = mfccp->mf6cc_origin;
872 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
873 rt->mf6c_parent = mfccp->mf6cc_parent;
874 rt->mf6c_ifset = mfccp->mf6cc_ifset;
875 /* initialize pkt counters per src-grp */
876 rt->mf6c_pkt_cnt = 0;
877 rt->mf6c_byte_cnt = 0;
878 rt->mf6c_wrong_if = 0;
880 rt->mf6c_expire = 0; /* Don't clean this guy up */
883 /* free packets Qed at the end of this entry */
884 for (rte = rt->mf6c_stall; rte != NULL; ) {
885 struct rtdetq *n = rte->next;
886 ip6_mdq(rte->m, rte->ifp, rt);
890 #endif /* UPCALL_TIMING */
891 free(rte, M_MRTABLE6);
894 rt->mf6c_stall = NULL;
899 * It is possible that an entry is being inserted without an upcall
902 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
903 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
904 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
905 mfccp->mf6cc_parent);
907 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
908 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
909 &mfccp->mf6cc_origin.sin6_addr)&&
910 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
911 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
912 rt->mf6c_origin = mfccp->mf6cc_origin;
913 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
914 rt->mf6c_parent = mfccp->mf6cc_parent;
915 rt->mf6c_ifset = mfccp->mf6cc_ifset;
916 /* initialize pkt counters per src-grp */
917 rt->mf6c_pkt_cnt = 0;
918 rt->mf6c_byte_cnt = 0;
919 rt->mf6c_wrong_if = 0;
927 /* no upcall, so make a new entry */
928 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
935 /* insert new entry at head of hash chain */
936 rt->mf6c_origin = mfccp->mf6cc_origin;
937 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
938 rt->mf6c_parent = mfccp->mf6cc_parent;
939 rt->mf6c_ifset = mfccp->mf6cc_ifset;
940 /* initialize pkt counters per src-grp */
941 rt->mf6c_pkt_cnt = 0;
942 rt->mf6c_byte_cnt = 0;
943 rt->mf6c_wrong_if = 0;
945 rt->mf6c_stall = NULL;
947 /* link into table */
948 rt->mf6c_next = mf6ctable[hash];
949 mf6ctable[hash] = rt;
959 * collect delay statistics on the upcalls
962 collate(struct timeval *t)
972 TV_DELTA(tp, *t, delta);
981 #endif /* UPCALL_TIMING */
984 * Delete an mfc entry
987 del_m6fc(struct mf6cctl *mfccp)
990 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
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);
1002 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
1003 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1004 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1008 nptr = &mf6ctable[hash];
1009 while ((rt = *nptr) != NULL) {
1010 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1011 &rt->mf6c_origin.sin6_addr) &&
1012 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1013 &rt->mf6c_mcastgrp.sin6_addr) &&
1014 rt->mf6c_stall == NULL)
1017 nptr = &rt->mf6c_next;
1021 return (EADDRNOTAVAIL);
1024 *nptr = rt->mf6c_next;
1025 free(rt, M_MRTABLE6);
1033 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1037 if (sbappendaddr(&s->so_rcv,
1038 (struct sockaddr *)src,
1039 mm, (struct mbuf *)0) != 0) {
1050 * IPv6 multicast forwarding function. This function assumes that the packet
1051 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1052 * pointed to by "ifp", and the packet is to be relayed to other networks
1053 * that have members of the packet's destination IPv6 multicast group.
1055 * The packet is returned unscathed to the caller, unless it is
1056 * erroneous, in which case a non-zero return value tells the caller to
1059 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1060 * this function is called in the originating context (i.e., not when
1061 * forwarding a packet from other node). ip6_output(), which is currently the
1062 * only function that calls this function is called in the originating context,
1063 * explicitly ensures this condition. It is caller's responsibility to ensure
1064 * that if this function is called from somewhere else in the originating
1065 * context in the future.
1068 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1077 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1078 #ifdef UPCALL_TIMING
1082 #endif /* UPCALL_TIMING */
1084 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1085 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1086 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
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 IP6STAT_INC(ip6s_cantforward);
1106 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1107 V_ip6_log_time = time_uptime;
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);
1125 MRT6STAT_INC(mrt6s_mfc_lookups);
1127 /* Entry exists, so forward if necessary */
1130 return (ip6_mdq(m, ifp, rt));
1134 * If we don't have a route for packet's origin,
1135 * Make a copy of the packet & send message to routing daemon.
1137 MRT6STAT_INC(mrt6s_no_route);
1138 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1139 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1140 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1143 * Allocate mbufs early so that we don't do extra work if we
1144 * are just going to fail anyway.
1146 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1151 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1153 * Pullup packet header if needed before storing it,
1154 * as other references may modify it in the meantime.
1156 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1157 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1159 free(rte, M_MRTABLE6);
1164 /* is there an upcall waiting for this packet? */
1165 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1166 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1167 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1168 &rt->mf6c_origin.sin6_addr) &&
1169 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1170 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1177 struct omrt6msg *oim;
1179 /* no upcall, so make a new entry */
1180 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1182 free(rte, M_MRTABLE6);
1188 * Make a copy of the header to send to the user
1191 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
1193 free(rte, M_MRTABLE6);
1195 free(rt, M_MRTABLE6);
1201 * Send message to routing daemon
1203 sin6.sin6_addr = ip6->ip6_src;
1208 switch (V_ip6_mrouter_ver) {
1211 oim = mtod(mm, struct omrt6msg *);
1212 oim->im6_msgtype = MRT6MSG_NOCACHE;
1217 im = mtod(mm, struct mrt6msg *);
1218 im->im6_msgtype = MRT6MSG_NOCACHE;
1222 free(rte, M_MRTABLE6);
1224 free(rt, M_MRTABLE6);
1229 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1230 for (mifp = mif6table, mifi = 0;
1231 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1234 switch (V_ip6_mrouter_ver) {
1237 oim->im6_mif = mifi;
1245 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1246 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1247 "socket queue full\n");
1248 MRT6STAT_INC(mrt6s_upq_sockfull);
1249 free(rte, M_MRTABLE6);
1251 free(rt, M_MRTABLE6);
1256 MRT6STAT_INC(mrt6s_upcalls);
1258 /* insert new entry at head of hash chain */
1259 bzero(rt, sizeof(*rt));
1260 rt->mf6c_origin.sin6_family = AF_INET6;
1261 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1262 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1263 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1264 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1265 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1266 rt->mf6c_expire = UPCALL_EXPIRE;
1268 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1270 /* link into table */
1271 rt->mf6c_next = mf6ctable[hash];
1272 mf6ctable[hash] = rt;
1273 /* Add this entry to the end of the queue */
1274 rt->mf6c_stall = rte;
1276 /* determine if q has overflowed */
1280 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1281 if (++npkts > MAX_UPQ6) {
1282 MRT6STAT_INC(mrt6s_upq_ovflw);
1283 free(rte, M_MRTABLE6);
1289 /* Add this entry to the end of the queue */
1296 #ifdef UPCALL_TIMING
1298 #endif /* UPCALL_TIMING */
1306 * Clean up cache entries if upcalls are not serviced
1307 * Call from the Slow Timeout mechanism, every half second.
1310 expire_upcalls(void *unused)
1313 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1316 struct mf6c *mfc, **nptr;
1321 for (i = 0; i < MF6CTBLSIZ; i++) {
1322 if (n6expire[i] == 0)
1324 nptr = &mf6ctable[i];
1325 while ((mfc = *nptr) != NULL) {
1326 rte = mfc->mf6c_stall;
1328 * Skip real cache entries
1329 * Make sure it wasn't marked to not expire (shouldn't happen)
1333 mfc->mf6c_expire != 0 &&
1334 --mfc->mf6c_expire == 0) {
1335 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1336 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1337 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1339 * drop all the packets
1340 * free the mbuf with the pkt, if, timing info
1343 struct rtdetq *n = rte->next;
1345 free(rte, M_MRTABLE6);
1347 } while (rte != NULL);
1348 MRT6STAT_INC(mrt6s_cache_cleanups);
1351 *nptr = mfc->mf6c_next;
1352 free(mfc, M_MRTABLE6);
1354 nptr = &mfc->mf6c_next;
1358 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1359 expire_upcalls, NULL);
1363 * Packet forwarding routine once entry in the cache is made
1366 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1368 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1371 int plen = m->m_pkthdr.len;
1372 struct in6_addr src0, dst0; /* copies for local work */
1373 u_int32_t iszone, idzone, oszone, odzone;
1377 * Don't forward if it didn't arrive from the parent mif
1380 mifi = rt->mf6c_parent;
1381 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1382 /* came in the wrong interface */
1383 MRT6_DLOG(DEBUG_FORWARD,
1384 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1385 mifi, mif6table[mifi].m6_ifp->if_index);
1386 MRT6STAT_INC(mrt6s_wrong_if);
1387 rt->mf6c_wrong_if++;
1389 * If we are doing PIM processing, and we are forwarding
1390 * packets on this interface, send a message to the
1393 /* have to make sure this is a valid mif */
1394 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1395 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1397 * Check the M_LOOP flag to avoid an
1398 * unnecessary PIM assert.
1399 * XXX: M_LOOP is an ad-hoc hack...
1401 static struct sockaddr_in6 sin6 =
1402 { sizeof(sin6), AF_INET6 };
1407 struct omrt6msg *oim;
1410 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
1414 mm->m_len < sizeof(struct ip6_hdr)))
1415 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1423 switch (V_ip6_mrouter_ver) {
1426 oim = mtod(mm, struct omrt6msg *);
1427 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1432 im = mtod(mm, struct mrt6msg *);
1433 im->im6_msgtype = MRT6MSG_WRONGMIF;
1441 for (mifp = mif6table, iif = 0;
1442 iif < nummifs && mifp &&
1443 mifp->m6_ifp != ifp;
1447 switch (V_ip6_mrouter_ver) {
1451 sin6.sin6_addr = oim->im6_src;
1456 sin6.sin6_addr = im->im6_src;
1460 MRT6STAT_INC(mrt6s_upcalls);
1462 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1463 MRT6_DLOG(DEBUG_ANY,
1464 "ip6_mrouter socket queue full");
1465 MRT6STAT_INC(mrt6s_upq_sockfull);
1467 } /* if socket Q full */
1470 } /* if wrong iif */
1472 /* If I sourced this packet, it counts as output, else it was input. */
1473 if (m->m_pkthdr.rcvif == NULL) {
1474 /* XXX: is rcvif really NULL when output?? */
1475 mif6table[mifi].m6_pkt_out++;
1476 mif6table[mifi].m6_bytes_out += plen;
1478 mif6table[mifi].m6_pkt_in++;
1479 mif6table[mifi].m6_bytes_in += plen;
1482 rt->mf6c_byte_cnt += plen;
1485 * For each mif, forward a copy of the packet if there are group
1486 * members downstream on the interface.
1488 src0 = ip6->ip6_src;
1489 dst0 = ip6->ip6_dst;
1490 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1491 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1492 IP6STAT_INC(ip6s_badscope);
1495 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1496 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1498 * check if the outgoing packet is going to break
1500 * XXX For packets through PIM register tunnel
1501 * interface, we believe a routing daemon.
1503 if (!(mif6table[rt->mf6c_parent].m6_flags &
1505 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1506 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1508 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1512 IP6STAT_INC(ip6s_badscope);
1518 mifp->m6_bytes_out += plen;
1519 if (mifp->m6_flags & MIFF_REGISTER)
1520 register_send(ip6, mifp, m);
1522 phyint_send(ip6, mifp, m);
1529 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1532 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1534 struct mbuf *mb_copy;
1535 struct ifnet *ifp = mifp->m6_ifp;
1536 int error __unused = 0;
1540 * Make a new reference to the packet; make sure that
1541 * the IPv6 header is actually copied, not just referenced,
1542 * so that ip6_output() only scribbles on the copy.
1544 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1546 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1547 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1548 if (mb_copy == NULL) {
1551 /* set MCAST flag to the outgoing packet */
1552 mb_copy->m_flags |= M_MCAST;
1555 * If we sourced the packet, call ip6_output since we may devide
1556 * the packet into fragments when the packet is too big for the
1557 * outgoing interface.
1558 * Otherwise, we can simply send the packet to the interface
1561 if (m->m_pkthdr.rcvif == NULL) {
1562 struct ip6_moptions im6o;
1563 struct epoch_tracker et;
1565 im6o.im6o_multicast_ifp = ifp;
1566 /* XXX: ip6_output will override ip6->ip6_hlim */
1567 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1568 im6o.im6o_multicast_loop = 1;
1569 NET_EPOCH_ENTER(et);
1570 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1574 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1575 (uint16_t)(mifp - mif6table), error);
1580 * If configured to loop back multicasts by default,
1581 * loop back a copy now.
1584 ip6_mloopback(ifp, m);
1587 * Put the packet into the sending queue of the outgoing interface
1588 * if it would fit in the MTU of the interface.
1590 linkmtu = IN6_LINKMTU(ifp);
1591 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1592 struct sockaddr_in6 dst6;
1594 bzero(&dst6, sizeof(dst6));
1595 dst6.sin6_len = sizeof(struct sockaddr_in6);
1596 dst6.sin6_family = AF_INET6;
1597 dst6.sin6_addr = ip6->ip6_dst;
1599 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1601 * We just call if_output instead of nd6_output here, since
1602 * we need no ND for a multicast forwarded packet...right?
1604 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1605 error = (*ifp->if_output)(ifp, mb_copy,
1606 (struct sockaddr *)&dst6, NULL);
1607 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1608 (uint16_t)(mifp - mif6table), error);
1611 * pMTU discovery is intentionally disabled by default, since
1612 * various router may notify pMTU in multicast, which can be
1613 * a DDoS to a router
1615 if (V_ip6_mcast_pmtu)
1616 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1618 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1619 "g %s size %d (discarded)", if_name(ifp),
1620 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1621 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1622 mb_copy->m_pkthdr.len);
1623 m_freem(mb_copy); /* simply discard the packet */
1629 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1632 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1635 int i, len = m->m_pkthdr.len;
1636 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1637 struct mrt6msg *im6;
1639 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1640 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1641 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1642 PIM6STAT_INC(pim6s_snd_registers);
1644 /* Make a copy of the packet to send to the user level process. */
1645 mm = m_gethdr(M_NOWAIT, MT_DATA);
1648 mm->m_data += max_linkhdr;
1649 mm->m_len = sizeof(struct ip6_hdr);
1651 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
1655 i = MHLEN - M_LEADINGSPACE(mm);
1658 mm = m_pullup(mm, i);
1661 /* TODO: check it! */
1662 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1665 * Send message to routing daemon
1667 sin6.sin6_addr = ip6->ip6_src;
1669 im6 = mtod(mm, struct mrt6msg *);
1670 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1673 im6->im6_mif = mif - mif6table;
1675 /* iif info is not given for reg. encap.n */
1676 MRT6STAT_INC(mrt6s_upcalls);
1678 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1679 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1680 MRT6STAT_INC(mrt6s_upq_sockfull);
1687 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1688 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1692 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
1693 int proto __unused, void *arg __unused)
1696 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1697 return (8); /* claim the datagram. */
1701 * PIM sparse mode hook
1702 * Receives the pim control messages, and passes them up to the listening
1703 * socket, using rip6_input.
1704 * The only message processed is the REGISTER pim message; the pim header
1705 * is stripped off, and the inner packet is passed to register_mforward.
1708 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
1710 struct pim *pim; /* pointer to a pim struct */
1711 struct ip6_hdr *ip6;
1715 PIM6STAT_INC(pim6s_rcv_total);
1720 pimlen = m->m_pkthdr.len - off;
1721 if (pimlen < PIM_MINLEN) {
1722 PIM6STAT_INC(pim6s_rcv_tooshort);
1723 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1725 return (IPPROTO_DONE);
1729 * if the packet is at least as big as a REGISTER, go ahead
1730 * and grab the PIM REGISTER header size, to avoid another
1731 * possible m_pullup() later.
1733 * PIM_MINLEN == pimhdr + u_int32 == 8
1734 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1736 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1739 * Make sure that the IP6 and PIM headers in contiguous memory, and
1740 * possibly the PIM REGISTER header
1742 if (m->m_len < off + minlen) {
1743 m = m_pullup(m, off + minlen);
1745 IP6STAT_INC(ip6s_exthdrtoolong);
1746 return (IPPROTO_DONE);
1749 ip6 = mtod(m, struct ip6_hdr *);
1750 pim = (struct pim *)((caddr_t)ip6 + off);
1752 #define PIM6_CHECKSUM
1753 #ifdef PIM6_CHECKSUM
1758 * Validate checksum.
1759 * If PIM REGISTER, exclude the data packet
1761 if (pim->pim_type == PIM_REGISTER)
1762 cksumlen = PIM_MINLEN;
1766 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1767 PIM6STAT_INC(pim6s_rcv_badsum);
1768 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1770 return (IPPROTO_DONE);
1773 #endif /* PIM_CHECKSUM */
1775 /* PIM version check */
1776 if (pim->pim_ver != PIM_VERSION) {
1777 PIM6STAT_INC(pim6s_rcv_badversion);
1778 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1779 "incorrect version %d, expecting %d",
1780 pim->pim_ver, PIM_VERSION);
1782 return (IPPROTO_DONE);
1785 if (pim->pim_type == PIM_REGISTER) {
1787 * since this is a REGISTER, we'll make a copy of the register
1788 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1791 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1794 struct ip6_hdr *eip6;
1797 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1800 PIM6STAT_INC(pim6s_rcv_registers);
1802 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1803 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1806 return (IPPROTO_DONE);
1809 reghdr = (u_int32_t *)(pim + 1);
1811 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1812 goto pim6_input_to_daemon;
1817 if (pimlen < PIM6_REG_MINLEN) {
1818 PIM6STAT_INC(pim6s_rcv_tooshort);
1819 PIM6STAT_INC(pim6s_rcv_badregisters);
1820 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1821 "size too small %d from %s",
1822 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1824 return (IPPROTO_DONE);
1827 eip6 = (struct ip6_hdr *) (reghdr + 1);
1828 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1829 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1830 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1831 ntohs(eip6->ip6_plen));
1833 /* verify the version number of the inner packet */
1834 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1835 PIM6STAT_INC(pim6s_rcv_badregisters);
1836 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1837 "of the inner packet",
1838 (eip6->ip6_vfc & IPV6_VERSION));
1840 return (IPPROTO_DONE);
1843 /* verify the inner packet is destined to a mcast group */
1844 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1845 PIM6STAT_INC(pim6s_rcv_badregisters);
1846 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1847 "is not multicast %s",
1848 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1850 return (IPPROTO_DONE);
1854 * make a copy of the whole header to pass to the daemon later.
1856 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
1858 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1859 "could not copy register head");
1861 return (IPPROTO_DONE);
1865 * forward the inner ip6 packet; point m_data at the inner ip6.
1867 m_adj(m, off + PIM_MINLEN);
1868 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1869 "src %s, dst %s, mif %d",
1870 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1871 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1873 if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1874 dst.sin6_family, 0);
1876 /* prepare the register head to send to the mrouting daemon */
1881 * Pass the PIM message up to the daemon; if it is a register message
1882 * pass the 'head' only up to the daemon. This includes the
1883 * encapsulator ip6 header, pim header, register header and the
1884 * encapsulated ip6 header.
1886 pim6_input_to_daemon:
1887 return (rip6_input(&m, &off, proto));
1891 ip6_mroute_modevent(module_t mod, int type, void *unused)
1896 MROUTER6_LOCK_INIT();
1900 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
1902 if (pim6_encap_cookie == NULL) {
1903 printf("ip6_mroute: unable to attach pim6 encap\n");
1904 MIF6_LOCK_DESTROY();
1905 MFC6_LOCK_DESTROY();
1906 MROUTER6_LOCK_DESTROY();
1910 ip6_mforward = X_ip6_mforward;
1911 ip6_mrouter_done = X_ip6_mrouter_done;
1912 ip6_mrouter_get = X_ip6_mrouter_get;
1913 ip6_mrouter_set = X_ip6_mrouter_set;
1914 mrt6_ioctl = X_mrt6_ioctl;
1918 if (V_ip6_mrouter != NULL)
1921 if (pim6_encap_cookie) {
1922 ip6_encap_detach(pim6_encap_cookie);
1923 pim6_encap_cookie = NULL;
1925 X_ip6_mrouter_done();
1926 ip6_mforward = NULL;
1927 ip6_mrouter_done = NULL;
1928 ip6_mrouter_get = NULL;
1929 ip6_mrouter_set = NULL;
1932 MIF6_LOCK_DESTROY();
1933 MFC6_LOCK_DESTROY();
1934 MROUTER6_LOCK_DESTROY();
1938 return (EOPNOTSUPP);
1944 static moduledata_t ip6_mroutemod = {
1946 ip6_mroute_modevent,
1950 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);