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,
153 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
154 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
156 SYSCTL_DECL(_net_inet6);
157 SYSCTL_DECL(_net_inet6_ip6);
158 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
159 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
162 static struct mrt6stat mrt6stat;
163 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
165 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
167 #define MRT6STAT_INC(name) mrt6stat.name += 1
168 #define NO_RTE_FOUND 0x1
169 #define RTE_FOUND 0x2
171 static struct mtx mrouter6_mtx;
172 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
173 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
174 #define MROUTER6_LOCK_ASSERT() do { \
175 mtx_assert(&mrouter6_mtx, MA_OWNED); \
176 NET_ASSERT_GIANT(); \
178 #define MROUTER6_LOCK_INIT() \
179 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
180 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
182 static struct mf6c *mf6ctable[MF6CTBLSIZ];
183 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
184 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
185 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
186 "netinet6/ip6_mroute.h)");
188 static struct mtx mfc6_mtx;
189 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
190 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
191 #define MFC6_LOCK_ASSERT() do { \
192 mtx_assert(&mfc6_mtx, MA_OWNED); \
193 NET_ASSERT_GIANT(); \
195 #define MFC6_LOCK_INIT() \
196 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
197 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
199 static u_char n6expire[MF6CTBLSIZ];
201 static struct mif6 mif6table[MAXMIFS];
203 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
205 struct mif6_sctl *out;
208 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
210 for (int i = 0; i < MAXMIFS; i++) {
211 out[i].m6_flags = mif6table[i].m6_flags;
212 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
213 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
214 if (mif6table[i].m6_ifp != NULL)
215 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
218 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
219 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
220 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
221 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
223 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
227 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
228 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
229 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
230 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
231 "netinet6/ip6_mroute.h)");
233 static struct mtx mif6_mtx;
234 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
235 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
236 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
237 #define MIF6_LOCK_INIT() \
238 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
239 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
242 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
243 #define V_mrt6debug VNET(mrt6debug)
244 #define DEBUG_MFC 0x02
245 #define DEBUG_FORWARD 0x04
246 #define DEBUG_EXPIRE 0x08
247 #define DEBUG_XMIT 0x10
248 #define DEBUG_REG 0x20
249 #define DEBUG_PIM 0x40
250 #define DEBUG_ERR 0x80
251 #define DEBUG_ANY 0x7f
252 #define MRT6_DLOG(m, fmt, ...) \
253 if (V_mrt6debug & (m)) \
254 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
255 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
257 #define MRT6_DLOG(m, fmt, ...)
260 static void expire_upcalls(void *);
261 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
262 #define UPCALL_EXPIRE 6 /* number of timeouts */
265 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
269 * 'Interfaces' associated with decapsulator (so we can tell
270 * packets that went through it from ones that get reflected
271 * by a broken gateway). Different from IPv4 register_if,
272 * these interfaces are linked into the system ifnet list,
273 * because per-interface IPv6 statistics are maintained in
274 * ifp->if_afdata. But it does not have any routes point
275 * to them. I.e., packets can't be sent this way. They
276 * only exist as a placeholder for multicast source
279 static struct ifnet *multicast_register_if6;
281 #define ENCAP_HOPS 64
286 static mifi_t nummifs = 0;
287 static mifi_t reg_mif_num = (mifi_t)-1;
289 static struct pim6stat pim6stat;
290 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
292 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
294 #define PIM6STAT_INC(name) pim6stat.name += 1
295 VNET_DEFINE_STATIC(int, pim6);
296 #define V_pim6 VNET(pim6)
299 * Hash function for a source, group entry
301 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
302 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
303 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
304 (g).s6_addr32[2] ^ (g).s6_addr32[3])
307 * Find a route for a given origin IPv6 address and Multicast group address.
309 #define MF6CFIND(o, g, rt) do { \
310 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
313 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
314 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
315 (_rt->mf6c_stall == NULL)) { \
319 _rt = _rt->mf6c_next; \
322 MRT6STAT_INC(mrt6s_mfc_misses); \
324 } while (/*CONSTCOND*/ 0)
327 * Macros to compute elapsed time efficiently
328 * Borrowed from Van Jacobson's scheduling code
329 * XXX: replace with timersub() ?
331 #define TV_DELTA(a, b, delta) do { \
334 delta = (a).tv_usec - (b).tv_usec; \
335 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
344 delta += (1000000 * xxs); \
347 } while (/*CONSTCOND*/ 0)
349 /* XXX: replace with timercmp(a, b, <) ? */
350 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
351 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
354 #define UPCALL_MAX 50
355 static u_long upcall_data[UPCALL_MAX + 1];
356 static void collate();
357 #endif /* UPCALL_TIMING */
359 static int ip6_mrouter_init(struct socket *, int, int);
360 static int add_m6fc(struct mf6cctl *);
361 static int add_m6if(struct mif6ctl *);
362 static int del_m6fc(struct mf6cctl *);
363 static int del_m6if(mifi_t *);
364 static int del_m6if_locked(mifi_t *);
365 static int get_mif6_cnt(struct sioc_mif_req6 *);
366 static int get_sg_cnt(struct sioc_sg_req6 *);
368 static struct callout expire_upcalls_ch;
370 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
371 int X_ip6_mrouter_done(void);
372 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
373 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
374 int X_mrt6_ioctl(u_long, caddr_t);
377 * Handle MRT setsockopt commands to modify the multicast routing tables.
380 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
388 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
391 switch (sopt->sopt_name) {
396 error = sooptcopyin(sopt, &optval, sizeof(optval),
400 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
403 error = X_ip6_mrouter_done();
406 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
409 error = add_m6if(&mifc);
412 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
415 error = add_m6fc(&mfcc);
418 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
421 error = del_m6fc(&mfcc);
424 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
427 error = del_m6if(&mifi);
430 error = sooptcopyin(sopt, &optval, sizeof(optval),
434 error = set_pim6(&optval);
445 * Handle MRT getsockopt commands
448 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
452 if (so != V_ip6_mrouter)
455 switch (sopt->sopt_name) {
457 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
464 * Handle ioctl commands to obtain information from the cache
467 X_mrt6_ioctl(u_long cmd, caddr_t data)
474 case SIOCGETSGCNT_IN6:
475 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
478 case SIOCGETMIFCNT_IN6:
479 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
490 * returns the packet, byte, rpf-failure count for the source group provided
493 get_sg_cnt(struct sioc_sg_req6 *req)
502 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
506 req->pktcnt = rt->mf6c_pkt_cnt;
507 req->bytecnt = rt->mf6c_byte_cnt;
508 req->wrong_if = rt->mf6c_wrong_if;
517 * returns the input and output packet and byte counts on the mif provided
520 get_mif6_cnt(struct sioc_mif_req6 *req)
530 if (mifi >= nummifs) {
533 req->icount = mif6table[mifi].m6_pkt_in;
534 req->ocount = mif6table[mifi].m6_pkt_out;
535 req->ibytes = mif6table[mifi].m6_bytes_in;
536 req->obytes = mif6table[mifi].m6_bytes_out;
547 if ((*i != 1) && (*i != 0))
556 * Enable multicast routing
559 ip6_mrouter_init(struct socket *so, int v, int cmd)
562 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
563 so->so_type, so->so_proto->pr_protocol);
565 if (so->so_type != SOCK_RAW ||
566 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
570 return (ENOPROTOOPT);
574 if (V_ip6_mrouter != NULL) {
580 V_ip6_mrouter_ver = cmd;
582 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
583 bzero((caddr_t)n6expire, sizeof(n6expire));
585 V_pim6 = 0;/* used for stubbing out/in pim stuff */
587 callout_init(&expire_upcalls_ch, 0);
588 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
589 expire_upcalls, NULL);
592 MRT6_DLOG(DEBUG_ANY, "finished");
598 * Disable IPv6 multicast forwarding.
601 X_ip6_mrouter_done(void)
610 if (V_ip6_mrouter == NULL) {
616 * For each phyint in use, disable promiscuous reception of all IPv6
619 for (mifi = 0; mifi < nummifs; mifi++) {
620 if (mif6table[mifi].m6_ifp &&
621 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
622 if_allmulti(mif6table[mifi].m6_ifp, 0);
625 bzero((caddr_t)mif6table, sizeof(mif6table));
628 V_pim6 = 0; /* used to stub out/in pim specific code */
630 callout_stop(&expire_upcalls_ch);
633 * Free all multicast forwarding cache entries.
636 for (i = 0; i < MF6CTBLSIZ; i++) {
641 for (rte = rt->mf6c_stall; rte != NULL; ) {
642 struct rtdetq *n = rte->next;
645 free(rte, M_MRTABLE6);
650 free(frt, M_MRTABLE6);
653 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
657 * Reset register interface
659 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
660 if_detach(multicast_register_if6);
661 if_free(multicast_register_if6);
662 reg_mif_num = (mifi_t)-1;
663 multicast_register_if6 = NULL;
666 V_ip6_mrouter = NULL;
667 V_ip6_mrouter_ver = 0;
670 MRT6_DLOG(DEBUG_ANY, "finished");
675 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
678 * Add a mif to the mif table
681 add_m6if(struct mif6ctl *mifcp)
689 if (mifcp->mif6c_mifi >= MAXMIFS) {
693 mifp = mif6table + mifcp->mif6c_mifi;
694 if (mifp->m6_ifp != NULL) {
696 return (EADDRINUSE); /* XXX: is it appropriate? */
698 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
703 ifp = ifnet_byindex(mifcp->mif6c_pifi);
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)) {
857 "add_m6fc: %s o %s g %s p %x dbx %p\n",
858 "multiple kernel entries",
860 &mfccp->mf6cc_origin.sin6_addr),
862 &mfccp->mf6cc_mcastgrp.sin6_addr),
863 mfccp->mf6cc_parent, rt->mf6c_stall);
865 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
867 &mfccp->mf6cc_origin.sin6_addr),
869 &mfccp->mf6cc_mcastgrp.sin6_addr),
870 mfccp->mf6cc_parent, rt->mf6c_stall);
872 rt->mf6c_origin = mfccp->mf6cc_origin;
873 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
874 rt->mf6c_parent = mfccp->mf6cc_parent;
875 rt->mf6c_ifset = mfccp->mf6cc_ifset;
876 /* initialize pkt counters per src-grp */
877 rt->mf6c_pkt_cnt = 0;
878 rt->mf6c_byte_cnt = 0;
879 rt->mf6c_wrong_if = 0;
881 rt->mf6c_expire = 0; /* Don't clean this guy up */
884 /* free packets Qed at the end of this entry */
885 for (rte = rt->mf6c_stall; rte != NULL; ) {
886 struct rtdetq *n = rte->next;
887 ip6_mdq(rte->m, rte->ifp, rt);
891 #endif /* UPCALL_TIMING */
892 free(rte, M_MRTABLE6);
895 rt->mf6c_stall = NULL;
900 * It is possible that an entry is being inserted without an upcall
903 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
904 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
905 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
906 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)
993 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
995 struct sockaddr_in6 origin;
996 struct sockaddr_in6 mcastgrp;
1001 origin = mfccp->mf6cc_origin;
1002 mcastgrp = mfccp->mf6cc_mcastgrp;
1003 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1005 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
1006 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1007 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1011 nptr = &mf6ctable[hash];
1012 while ((rt = *nptr) != NULL) {
1013 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1014 &rt->mf6c_origin.sin6_addr) &&
1015 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1016 &rt->mf6c_mcastgrp.sin6_addr) &&
1017 rt->mf6c_stall == NULL)
1020 nptr = &rt->mf6c_next;
1024 return (EADDRNOTAVAIL);
1027 *nptr = rt->mf6c_next;
1028 free(rt, M_MRTABLE6);
1036 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1040 if (sbappendaddr(&s->so_rcv,
1041 (struct sockaddr *)src,
1042 mm, (struct mbuf *)0) != 0) {
1052 * IPv6 multicast forwarding function. This function assumes that the packet
1053 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1054 * pointed to by "ifp", and the packet is to be relayed to other networks
1055 * that have members of the packet's destination IPv6 multicast group.
1057 * The packet is returned unscathed to the caller, unless it is
1058 * erroneous, in which case a non-zero return value tells the caller to
1061 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1062 * this function is called in the originating context (i.e., not when
1063 * forwarding a packet from other node). ip6_output(), which is currently the
1064 * only function that calls this function is called in the originating context,
1065 * explicitly ensures this condition. It is caller's responsibility to ensure
1066 * that if this function is called from somewhere else in the originating
1067 * context in the future.
1070 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1079 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1080 #ifdef UPCALL_TIMING
1084 #endif /* UPCALL_TIMING */
1086 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1087 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1088 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1091 * Don't forward a packet with Hop limit of zero or one,
1092 * or a packet destined to a local-only group.
1094 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1095 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1100 * Source address check: do not forward packets with unspecified
1101 * source. It was discussed in July 2000, on ipngwg mailing list.
1102 * This is rather more serious than unicast cases, because some
1103 * MLD packets can be sent with the unspecified source address
1104 * (although such packets must normally set 1 to the hop limit field).
1106 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1107 IP6STAT_INC(ip6s_cantforward);
1108 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1109 V_ip6_log_time = time_uptime;
1112 "from %s to %s nxt %d received on %s\n",
1113 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1114 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1116 if_name(m->m_pkthdr.rcvif));
1124 * Determine forwarding mifs from the forwarding cache table
1126 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1127 MRT6STAT_INC(mrt6s_mfc_lookups);
1129 /* Entry exists, so forward if necessary */
1132 return (ip6_mdq(m, ifp, rt));
1136 * If we don't have a route for packet's origin,
1137 * Make a copy of the packet & send message to routing daemon.
1139 MRT6STAT_INC(mrt6s_no_route);
1140 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1141 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1142 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1145 * Allocate mbufs early so that we don't do extra work if we
1146 * are just going to fail anyway.
1148 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1153 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1155 * Pullup packet header if needed before storing it,
1156 * as other references may modify it in the meantime.
1158 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1159 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1161 free(rte, M_MRTABLE6);
1166 /* is there an upcall waiting for this packet? */
1167 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1168 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1169 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1170 &rt->mf6c_origin.sin6_addr) &&
1171 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1172 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1179 struct omrt6msg *oim;
1181 /* no upcall, so make a new entry */
1182 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1184 free(rte, M_MRTABLE6);
1190 * Make a copy of the header to send to the user
1193 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
1195 free(rte, M_MRTABLE6);
1197 free(rt, M_MRTABLE6);
1203 * Send message to routing daemon
1205 sin6.sin6_addr = ip6->ip6_src;
1210 switch (V_ip6_mrouter_ver) {
1213 oim = mtod(mm, struct omrt6msg *);
1214 oim->im6_msgtype = MRT6MSG_NOCACHE;
1219 im = mtod(mm, struct mrt6msg *);
1220 im->im6_msgtype = MRT6MSG_NOCACHE;
1224 free(rte, M_MRTABLE6);
1226 free(rt, M_MRTABLE6);
1231 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1232 for (mifp = mif6table, mifi = 0;
1233 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1236 switch (V_ip6_mrouter_ver) {
1239 oim->im6_mif = mifi;
1247 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1248 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1249 "socket queue full\n");
1250 MRT6STAT_INC(mrt6s_upq_sockfull);
1251 free(rte, M_MRTABLE6);
1253 free(rt, M_MRTABLE6);
1258 MRT6STAT_INC(mrt6s_upcalls);
1260 /* insert new entry at head of hash chain */
1261 bzero(rt, sizeof(*rt));
1262 rt->mf6c_origin.sin6_family = AF_INET6;
1263 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1264 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1265 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1266 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1267 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1268 rt->mf6c_expire = UPCALL_EXPIRE;
1270 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1272 /* link into table */
1273 rt->mf6c_next = mf6ctable[hash];
1274 mf6ctable[hash] = rt;
1275 /* Add this entry to the end of the queue */
1276 rt->mf6c_stall = rte;
1278 /* determine if q has overflowed */
1282 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1283 if (++npkts > MAX_UPQ6) {
1284 MRT6STAT_INC(mrt6s_upq_ovflw);
1285 free(rte, M_MRTABLE6);
1291 /* Add this entry to the end of the queue */
1298 #ifdef UPCALL_TIMING
1300 #endif /* UPCALL_TIMING */
1308 * Clean up cache entries if upcalls are not serviced
1309 * Call from the Slow Timeout mechanism, every half second.
1312 expire_upcalls(void *unused)
1315 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1318 struct mf6c *mfc, **nptr;
1322 for (i = 0; i < MF6CTBLSIZ; i++) {
1323 if (n6expire[i] == 0)
1325 nptr = &mf6ctable[i];
1326 while ((mfc = *nptr) != NULL) {
1327 rte = mfc->mf6c_stall;
1329 * Skip real cache entries
1330 * Make sure it wasn't marked to not expire (shouldn't happen)
1334 mfc->mf6c_expire != 0 &&
1335 --mfc->mf6c_expire == 0) {
1336 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1337 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1338 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1340 * drop all the packets
1341 * free the mbuf with the pkt, if, timing info
1344 struct rtdetq *n = rte->next;
1346 free(rte, M_MRTABLE6);
1348 } while (rte != NULL);
1349 MRT6STAT_INC(mrt6s_cache_cleanups);
1352 *nptr = mfc->mf6c_next;
1353 free(mfc, M_MRTABLE6);
1355 nptr = &mfc->mf6c_next;
1360 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1361 expire_upcalls, NULL);
1365 * Packet forwarding routine once entry in the cache is made
1368 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1370 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1373 int plen = m->m_pkthdr.len;
1374 struct in6_addr src0, dst0; /* copies for local work */
1375 u_int32_t iszone, idzone, oszone, odzone;
1379 * Don't forward if it didn't arrive from the parent mif
1382 mifi = rt->mf6c_parent;
1383 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1384 /* came in the wrong interface */
1385 MRT6_DLOG(DEBUG_FORWARD,
1386 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1387 mifi, mif6table[mifi].m6_ifp->if_index);
1388 MRT6STAT_INC(mrt6s_wrong_if);
1389 rt->mf6c_wrong_if++;
1391 * If we are doing PIM processing, and we are forwarding
1392 * packets on this interface, send a message to the
1395 /* have to make sure this is a valid mif */
1396 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1397 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1399 * Check the M_LOOP flag to avoid an
1400 * unnecessary PIM assert.
1401 * XXX: M_LOOP is an ad-hoc hack...
1403 static struct sockaddr_in6 sin6 =
1404 { sizeof(sin6), AF_INET6 };
1409 struct omrt6msg *oim;
1412 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
1416 mm->m_len < sizeof(struct ip6_hdr)))
1417 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1425 switch (V_ip6_mrouter_ver) {
1428 oim = mtod(mm, struct omrt6msg *);
1429 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1434 im = mtod(mm, struct mrt6msg *);
1435 im->im6_msgtype = MRT6MSG_WRONGMIF;
1443 for (mifp = mif6table, iif = 0;
1444 iif < nummifs && mifp &&
1445 mifp->m6_ifp != ifp;
1449 switch (V_ip6_mrouter_ver) {
1453 sin6.sin6_addr = oim->im6_src;
1458 sin6.sin6_addr = im->im6_src;
1462 MRT6STAT_INC(mrt6s_upcalls);
1464 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1465 MRT6_DLOG(DEBUG_ANY,
1466 "ip6_mrouter socket queue full");
1467 MRT6STAT_INC(mrt6s_upq_sockfull);
1469 } /* if socket Q full */
1472 } /* if wrong iif */
1474 /* If I sourced this packet, it counts as output, else it was input. */
1475 if (m->m_pkthdr.rcvif == NULL) {
1476 /* XXX: is rcvif really NULL when output?? */
1477 mif6table[mifi].m6_pkt_out++;
1478 mif6table[mifi].m6_bytes_out += plen;
1480 mif6table[mifi].m6_pkt_in++;
1481 mif6table[mifi].m6_bytes_in += plen;
1484 rt->mf6c_byte_cnt += plen;
1487 * For each mif, forward a copy of the packet if there are group
1488 * members downstream on the interface.
1490 src0 = ip6->ip6_src;
1491 dst0 = ip6->ip6_dst;
1492 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1493 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1494 IP6STAT_INC(ip6s_badscope);
1497 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1498 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1500 * check if the outgoing packet is going to break
1502 * XXX For packets through PIM register tunnel
1503 * interface, we believe a routing daemon.
1505 if (!(mif6table[rt->mf6c_parent].m6_flags &
1507 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1508 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1510 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1514 IP6STAT_INC(ip6s_badscope);
1520 mifp->m6_bytes_out += plen;
1521 if (mifp->m6_flags & MIFF_REGISTER)
1522 register_send(ip6, mifp, m);
1524 phyint_send(ip6, mifp, m);
1531 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1534 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1536 struct mbuf *mb_copy;
1537 struct ifnet *ifp = mifp->m6_ifp;
1542 * Make a new reference to the packet; make sure that
1543 * the IPv6 header is actually copied, not just referenced,
1544 * so that ip6_output() only scribbles on the copy.
1546 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1548 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1549 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1550 if (mb_copy == NULL) {
1553 /* set MCAST flag to the outgoing packet */
1554 mb_copy->m_flags |= M_MCAST;
1557 * If we sourced the packet, call ip6_output since we may devide
1558 * the packet into fragments when the packet is too big for the
1559 * outgoing interface.
1560 * Otherwise, we can simply send the packet to the interface
1563 if (m->m_pkthdr.rcvif == NULL) {
1564 struct ip6_moptions im6o;
1565 struct epoch_tracker et;
1567 im6o.im6o_multicast_ifp = ifp;
1568 /* XXX: ip6_output will override ip6->ip6_hlim */
1569 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1570 im6o.im6o_multicast_loop = 1;
1571 NET_EPOCH_ENTER(et);
1572 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1576 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1577 (uint16_t)(mifp - mif6table), error);
1582 * If configured to loop back multicasts by default,
1583 * loop back a copy now.
1586 ip6_mloopback(ifp, m);
1589 * Put the packet into the sending queue of the outgoing interface
1590 * if it would fit in the MTU of the interface.
1592 linkmtu = IN6_LINKMTU(ifp);
1593 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1594 struct sockaddr_in6 dst6;
1596 bzero(&dst6, sizeof(dst6));
1597 dst6.sin6_len = sizeof(struct sockaddr_in6);
1598 dst6.sin6_family = AF_INET6;
1599 dst6.sin6_addr = ip6->ip6_dst;
1601 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1603 * We just call if_output instead of nd6_output here, since
1604 * we need no ND for a multicast forwarded packet...right?
1606 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1607 error = (*ifp->if_output)(ifp, mb_copy,
1608 (struct sockaddr *)&dst6, NULL);
1609 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1610 (uint16_t)(mifp - mif6table), error);
1613 * pMTU discovery is intentionally disabled by default, since
1614 * various router may notify pMTU in multicast, which can be
1615 * a DDoS to a router
1617 if (V_ip6_mcast_pmtu)
1618 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1620 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1621 "g %s size %d (discarded)", if_name(ifp),
1622 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1623 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1624 mb_copy->m_pkthdr.len);
1625 m_freem(mb_copy); /* simply discard the packet */
1631 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1634 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1637 int i, len = m->m_pkthdr.len;
1638 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1639 struct mrt6msg *im6;
1641 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1642 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1643 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1644 PIM6STAT_INC(pim6s_snd_registers);
1646 /* Make a copy of the packet to send to the user level process. */
1647 mm = m_gethdr(M_NOWAIT, MT_DATA);
1650 mm->m_data += max_linkhdr;
1651 mm->m_len = sizeof(struct ip6_hdr);
1653 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
1657 i = MHLEN - M_LEADINGSPACE(mm);
1660 mm = m_pullup(mm, i);
1663 /* TODO: check it! */
1664 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1667 * Send message to routing daemon
1669 sin6.sin6_addr = ip6->ip6_src;
1671 im6 = mtod(mm, struct mrt6msg *);
1672 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1675 im6->im6_mif = mif - mif6table;
1677 /* iif info is not given for reg. encap.n */
1678 MRT6STAT_INC(mrt6s_upcalls);
1680 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1681 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1682 MRT6STAT_INC(mrt6s_upq_sockfull);
1689 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1690 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1694 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
1695 int proto __unused, void *arg __unused)
1698 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1699 return (8); /* claim the datagram. */
1703 * PIM sparse mode hook
1704 * Receives the pim control messages, and passes them up to the listening
1705 * socket, using rip6_input.
1706 * The only message processed is the REGISTER pim message; the pim header
1707 * is stripped off, and the inner packet is passed to register_mforward.
1710 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
1712 struct pim *pim; /* pointer to a pim struct */
1713 struct ip6_hdr *ip6;
1717 PIM6STAT_INC(pim6s_rcv_total);
1722 pimlen = m->m_pkthdr.len - off;
1723 if (pimlen < PIM_MINLEN) {
1724 PIM6STAT_INC(pim6s_rcv_tooshort);
1725 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1727 return (IPPROTO_DONE);
1731 * if the packet is at least as big as a REGISTER, go ahead
1732 * and grab the PIM REGISTER header size, to avoid another
1733 * possible m_pullup() later.
1735 * PIM_MINLEN == pimhdr + u_int32 == 8
1736 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1738 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1741 * Make sure that the IP6 and PIM headers in contiguous memory, and
1742 * possibly the PIM REGISTER header
1744 if (m->m_len < off + minlen) {
1745 m = m_pullup(m, off + minlen);
1747 IP6STAT_INC(ip6s_exthdrtoolong);
1748 return (IPPROTO_DONE);
1751 ip6 = mtod(m, struct ip6_hdr *);
1752 pim = (struct pim *)((caddr_t)ip6 + off);
1754 #define PIM6_CHECKSUM
1755 #ifdef PIM6_CHECKSUM
1760 * Validate checksum.
1761 * If PIM REGISTER, exclude the data packet
1763 if (pim->pim_type == PIM_REGISTER)
1764 cksumlen = PIM_MINLEN;
1768 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1769 PIM6STAT_INC(pim6s_rcv_badsum);
1770 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1772 return (IPPROTO_DONE);
1775 #endif /* PIM_CHECKSUM */
1777 /* PIM version check */
1778 if (pim->pim_ver != PIM_VERSION) {
1779 PIM6STAT_INC(pim6s_rcv_badversion);
1780 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1781 "incorrect version %d, expecting %d",
1782 pim->pim_ver, PIM_VERSION);
1784 return (IPPROTO_DONE);
1787 if (pim->pim_type == PIM_REGISTER) {
1789 * since this is a REGISTER, we'll make a copy of the register
1790 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1793 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1796 struct ip6_hdr *eip6;
1800 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1803 PIM6STAT_INC(pim6s_rcv_registers);
1805 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1806 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1809 return (IPPROTO_DONE);
1812 reghdr = (u_int32_t *)(pim + 1);
1814 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1815 goto pim6_input_to_daemon;
1820 if (pimlen < PIM6_REG_MINLEN) {
1821 PIM6STAT_INC(pim6s_rcv_tooshort);
1822 PIM6STAT_INC(pim6s_rcv_badregisters);
1823 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1824 "size too small %d from %s",
1825 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1827 return (IPPROTO_DONE);
1830 eip6 = (struct ip6_hdr *) (reghdr + 1);
1831 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1832 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1833 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1834 ntohs(eip6->ip6_plen));
1836 /* verify the version number of the inner packet */
1837 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1838 PIM6STAT_INC(pim6s_rcv_badregisters);
1839 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1840 "of the inner packet",
1841 (eip6->ip6_vfc & IPV6_VERSION));
1843 return (IPPROTO_DONE);
1846 /* verify the inner packet is destined to a mcast group */
1847 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1848 PIM6STAT_INC(pim6s_rcv_badregisters);
1849 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1850 "is not multicast %s",
1851 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1853 return (IPPROTO_DONE);
1857 * make a copy of the whole header to pass to the daemon later.
1859 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
1861 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1862 "could not copy register head");
1864 return (IPPROTO_DONE);
1868 * forward the inner ip6 packet; point m_data at the inner ip6.
1870 m_adj(m, off + PIM_MINLEN);
1871 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1872 "src %s, dst %s, mif %d",
1873 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1874 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1876 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1877 dst.sin6_family, 0);
1879 /* prepare the register head to send to the mrouting daemon */
1884 * Pass the PIM message up to the daemon; if it is a register message
1885 * pass the 'head' only up to the daemon. This includes the
1886 * encapsulator ip6 header, pim header, register header and the
1887 * encapsulated ip6 header.
1889 pim6_input_to_daemon:
1890 return (rip6_input(&m, &off, proto));
1894 ip6_mroute_modevent(module_t mod, int type, void *unused)
1899 MROUTER6_LOCK_INIT();
1903 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
1905 if (pim6_encap_cookie == NULL) {
1906 printf("ip6_mroute: unable to attach pim6 encap\n");
1907 MIF6_LOCK_DESTROY();
1908 MFC6_LOCK_DESTROY();
1909 MROUTER6_LOCK_DESTROY();
1913 ip6_mforward = X_ip6_mforward;
1914 ip6_mrouter_done = X_ip6_mrouter_done;
1915 ip6_mrouter_get = X_ip6_mrouter_get;
1916 ip6_mrouter_set = X_ip6_mrouter_set;
1917 mrt6_ioctl = X_mrt6_ioctl;
1921 if (V_ip6_mrouter != NULL)
1924 if (pim6_encap_cookie) {
1925 ip6_encap_detach(pim6_encap_cookie);
1926 pim6_encap_cookie = NULL;
1928 X_ip6_mrouter_done();
1929 ip6_mforward = NULL;
1930 ip6_mrouter_done = NULL;
1931 ip6_mrouter_get = NULL;
1932 ip6_mrouter_set = NULL;
1935 MIF6_LOCK_DESTROY();
1936 MFC6_LOCK_DESTROY();
1937 MROUTER6_LOCK_DESTROY();
1941 return (EOPNOTSUPP);
1947 static moduledata_t ip6_mroutemod = {
1949 ip6_mroute_modevent,
1953 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);