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("$FreeBSD$");
84 #include "opt_inet6.h"
86 #include <sys/param.h>
87 #include <sys/callout.h>
88 #include <sys/errno.h>
89 #include <sys/kernel.h>
91 #include <sys/malloc.h>
93 #include <sys/module.h>
94 #include <sys/domain.h>
95 #include <sys/protosw.h>
97 #include <sys/signalvar.h>
98 #include <sys/socket.h>
99 #include <sys/socketvar.h>
100 #include <sys/sockio.h>
102 #include <sys/sysctl.h>
103 #include <sys/syslog.h>
104 #include <sys/systm.h>
105 #include <sys/time.h>
108 #include <net/if_var.h>
109 #include <net/if_types.h>
110 #include <net/raw_cb.h>
111 #include <net/vnet.h>
113 #include <netinet/in.h>
114 #include <netinet/in_var.h>
115 #include <netinet/icmp6.h>
116 #include <netinet/ip_encap.h>
118 #include <netinet/ip6.h>
119 #include <netinet/in_kdtrace.h>
120 #include <netinet6/ip6_var.h>
121 #include <netinet6/scope6_var.h>
122 #include <netinet6/nd6.h>
123 #include <netinet6/ip6_mroute.h>
124 #include <netinet6/pim6.h>
125 #include <netinet6/pim6_var.h>
127 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
129 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
130 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
131 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
132 static int set_pim6(int *);
133 static int socket_send(struct socket *, struct mbuf *,
134 struct sockaddr_in6 *);
136 extern int in6_mcast_loop;
137 extern struct domain inet6domain;
139 static const struct encaptab *pim6_encap_cookie;
140 static const struct protosw in6_pim_protosw = {
142 .pr_domain = &inet6domain,
143 .pr_protocol = IPPROTO_PIM,
144 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
145 .pr_input = pim6_input,
146 .pr_output = rip6_output,
147 .pr_ctloutput = rip6_ctloutput,
148 .pr_usrreqs = &rip6_usrreqs
150 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
152 static VNET_DEFINE(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, CTLFLAG_RW, 0, "PIM");
159 static struct mrt6stat mrt6stat;
160 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
162 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
164 #define MRT6STAT_INC(name) mrt6stat.name += 1
165 #define NO_RTE_FOUND 0x1
166 #define RTE_FOUND 0x2
168 static struct mtx mrouter6_mtx;
169 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
170 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
171 #define MROUTER6_LOCK_ASSERT() do { \
172 mtx_assert(&mrouter6_mtx, MA_OWNED); \
173 NET_ASSERT_GIANT(); \
175 #define MROUTER6_LOCK_INIT() \
176 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
177 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
179 static struct mf6c *mf6ctable[MF6CTBLSIZ];
180 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
181 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
182 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
183 "netinet6/ip6_mroute.h)");
185 static struct mtx mfc6_mtx;
186 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
187 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
188 #define MFC6_LOCK_ASSERT() do { \
189 mtx_assert(&mfc6_mtx, MA_OWNED); \
190 NET_ASSERT_GIANT(); \
192 #define MFC6_LOCK_INIT() \
193 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
194 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
196 static u_char n6expire[MF6CTBLSIZ];
198 static struct mif6 mif6table[MAXMIFS];
200 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
202 struct mif6_sctl *out;
205 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
207 for (int i = 0; i < MAXMIFS; i++) {
208 out[i].m6_flags = mif6table[i].m6_flags;
209 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
210 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
211 if (mif6table[i].m6_ifp != NULL)
212 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
215 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
216 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
217 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
218 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
220 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
224 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD,
225 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
226 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
227 "netinet6/ip6_mroute.h)");
229 static struct mtx mif6_mtx;
230 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
231 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
232 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
233 #define MIF6_LOCK_INIT() \
234 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
235 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
238 static VNET_DEFINE(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 static VNET_DEFINE(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(&expire_upcalls_ch, 0);
584 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
585 expire_upcalls, NULL);
588 MRT6_DLOG(DEBUG_ANY, "finished");
594 * Disable IPv6 multicast forwarding.
597 X_ip6_mrouter_done(void)
606 if (V_ip6_mrouter == NULL) {
612 * For each phyint in use, disable promiscuous reception of all IPv6
615 for (mifi = 0; mifi < nummifs; mifi++) {
616 if (mif6table[mifi].m6_ifp &&
617 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
618 if_allmulti(mif6table[mifi].m6_ifp, 0);
621 bzero((caddr_t)mif6table, sizeof(mif6table));
624 V_pim6 = 0; /* used to stub out/in pim specific code */
626 callout_stop(&expire_upcalls_ch);
629 * Free all multicast forwarding cache entries.
632 for (i = 0; i < MF6CTBLSIZ; i++) {
637 for (rte = rt->mf6c_stall; rte != NULL; ) {
638 struct rtdetq *n = rte->next;
641 free(rte, M_MRTABLE6);
646 free(frt, M_MRTABLE6);
649 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
653 * Reset register interface
655 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
656 if_detach(multicast_register_if6);
657 if_free(multicast_register_if6);
658 reg_mif_num = (mifi_t)-1;
659 multicast_register_if6 = NULL;
662 V_ip6_mrouter = NULL;
663 V_ip6_mrouter_ver = 0;
666 MRT6_DLOG(DEBUG_ANY, "finished");
671 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
674 * Add a mif to the mif table
677 add_m6if(struct mif6ctl *mifcp)
685 if (mifcp->mif6c_mifi >= MAXMIFS) {
689 mifp = mif6table + mifcp->mif6c_mifi;
690 if (mifp->m6_ifp != NULL) {
692 return (EADDRINUSE); /* XXX: is it appropriate? */
694 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
699 ifp = ifnet_byindex(mifcp->mif6c_pifi);
701 if (mifcp->mif6c_flags & MIFF_REGISTER) {
702 if (reg_mif_num == (mifi_t)-1) {
703 ifp = if_alloc(IFT_OTHER);
705 if_initname(ifp, "register_mif", 0);
706 ifp->if_flags |= IFF_LOOPBACK;
708 multicast_register_if6 = ifp;
709 reg_mif_num = mifcp->mif6c_mifi;
711 * it is impossible to guess the ifindex of the
712 * register interface. So mif6c_pifi is automatically
715 mifcp->mif6c_pifi = ifp->if_index;
717 ifp = multicast_register_if6;
720 /* Make sure the interface supports multicast */
721 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
726 error = if_allmulti(ifp, 1);
733 mifp->m6_flags = mifcp->mif6c_flags;
736 /* initialize per mif pkt counters */
738 mifp->m6_pkt_out = 0;
739 mifp->m6_bytes_in = 0;
740 mifp->m6_bytes_out = 0;
742 /* Adjust nummifs up if the mifi is higher than nummifs */
743 if (nummifs <= mifcp->mif6c_mifi)
744 nummifs = mifcp->mif6c_mifi + 1;
747 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
754 * Delete a mif from the mif table
757 del_m6if_locked(mifi_t *mifip)
759 struct mif6 *mifp = mif6table + *mifip;
765 if (*mifip >= nummifs)
767 if (mifp->m6_ifp == NULL)
770 if (!(mifp->m6_flags & MIFF_REGISTER)) {
771 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
775 if (reg_mif_num != (mifi_t)-1 &&
776 multicast_register_if6 != NULL) {
777 if_detach(multicast_register_if6);
778 if_free(multicast_register_if6);
779 reg_mif_num = (mifi_t)-1;
780 multicast_register_if6 = NULL;
784 bzero((caddr_t)mifp, sizeof(*mifp));
786 /* Adjust nummifs down */
787 for (mifi = nummifs; mifi > 0; mifi--)
788 if (mif6table[mifi - 1].m6_ifp)
791 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
797 del_m6if(mifi_t *mifip)
802 cc = del_m6if_locked(mifip);
812 add_m6fc(struct mf6cctl *mfccp)
818 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
822 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
823 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
825 /* If an entry already exists, just update the fields */
827 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
828 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
829 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
830 mfccp->mf6cc_parent);
832 rt->mf6c_parent = mfccp->mf6cc_parent;
833 rt->mf6c_ifset = mfccp->mf6cc_ifset;
840 * Find the entry for which the upcall was made and update
842 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
843 mfccp->mf6cc_mcastgrp.sin6_addr);
844 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
845 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
846 &mfccp->mf6cc_origin.sin6_addr) &&
847 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
848 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
849 (rt->mf6c_stall != NULL)) {
853 "add_m6fc: %s o %s g %s p %x dbx %p\n",
854 "multiple kernel entries",
856 &mfccp->mf6cc_origin.sin6_addr),
858 &mfccp->mf6cc_mcastgrp.sin6_addr),
859 mfccp->mf6cc_parent, rt->mf6c_stall);
861 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
863 &mfccp->mf6cc_origin.sin6_addr),
865 &mfccp->mf6cc_mcastgrp.sin6_addr),
866 mfccp->mf6cc_parent, rt->mf6c_stall);
868 rt->mf6c_origin = mfccp->mf6cc_origin;
869 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
870 rt->mf6c_parent = mfccp->mf6cc_parent;
871 rt->mf6c_ifset = mfccp->mf6cc_ifset;
872 /* initialize pkt counters per src-grp */
873 rt->mf6c_pkt_cnt = 0;
874 rt->mf6c_byte_cnt = 0;
875 rt->mf6c_wrong_if = 0;
877 rt->mf6c_expire = 0; /* Don't clean this guy up */
880 /* free packets Qed at the end of this entry */
881 for (rte = rt->mf6c_stall; rte != NULL; ) {
882 struct rtdetq *n = rte->next;
883 ip6_mdq(rte->m, rte->ifp, rt);
887 #endif /* UPCALL_TIMING */
888 free(rte, M_MRTABLE6);
891 rt->mf6c_stall = NULL;
896 * It is possible that an entry is being inserted without an upcall
899 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
900 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
901 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
902 mfccp->mf6cc_parent);
904 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
906 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
907 &mfccp->mf6cc_origin.sin6_addr)&&
908 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
909 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
911 rt->mf6c_origin = mfccp->mf6cc_origin;
912 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
913 rt->mf6c_parent = mfccp->mf6cc_parent;
914 rt->mf6c_ifset = mfccp->mf6cc_ifset;
915 /* initialize pkt counters per src-grp */
916 rt->mf6c_pkt_cnt = 0;
917 rt->mf6c_byte_cnt = 0;
918 rt->mf6c_wrong_if = 0;
926 /* no upcall, so make a new entry */
927 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
934 /* insert new entry at head of hash chain */
935 rt->mf6c_origin = mfccp->mf6cc_origin;
936 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
937 rt->mf6c_parent = mfccp->mf6cc_parent;
938 rt->mf6c_ifset = mfccp->mf6cc_ifset;
939 /* initialize pkt counters per src-grp */
940 rt->mf6c_pkt_cnt = 0;
941 rt->mf6c_byte_cnt = 0;
942 rt->mf6c_wrong_if = 0;
944 rt->mf6c_stall = NULL;
946 /* link into table */
947 rt->mf6c_next = mf6ctable[hash];
948 mf6ctable[hash] = rt;
958 * collect delay statistics on the upcalls
961 collate(struct timeval *t)
971 TV_DELTA(tp, *t, delta);
980 #endif /* UPCALL_TIMING */
983 * Delete an mfc entry
986 del_m6fc(struct mf6cctl *mfccp)
989 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
991 struct sockaddr_in6 origin;
992 struct sockaddr_in6 mcastgrp;
997 origin = mfccp->mf6cc_origin;
998 mcastgrp = mfccp->mf6cc_mcastgrp;
999 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1001 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
1002 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1003 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1007 nptr = &mf6ctable[hash];
1008 while ((rt = *nptr) != NULL) {
1009 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1010 &rt->mf6c_origin.sin6_addr) &&
1011 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1012 &rt->mf6c_mcastgrp.sin6_addr) &&
1013 rt->mf6c_stall == NULL)
1016 nptr = &rt->mf6c_next;
1020 return (EADDRNOTAVAIL);
1023 *nptr = rt->mf6c_next;
1024 free(rt, M_MRTABLE6);
1032 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1036 if (sbappendaddr(&s->so_rcv,
1037 (struct sockaddr *)src,
1038 mm, (struct mbuf *)0) != 0) {
1048 * IPv6 multicast forwarding function. This function assumes that the packet
1049 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1050 * pointed to by "ifp", and the packet is to be relayed to other networks
1051 * that have members of the packet's destination IPv6 multicast group.
1053 * The packet is returned unscathed to the caller, unless it is
1054 * erroneous, in which case a non-zero return value tells the caller to
1057 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1058 * this function is called in the originating context (i.e., not when
1059 * forwarding a packet from other node). ip6_output(), which is currently the
1060 * only function that calls this function is called in the originating context,
1061 * explicitly ensures this condition. It is caller's responsibility to ensure
1062 * that if this function is called from somewhere else in the originating
1063 * context in the future.
1066 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1075 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1076 #ifdef UPCALL_TIMING
1080 #endif /* UPCALL_TIMING */
1082 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1083 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1087 * Don't forward a packet with Hop limit of zero or one,
1088 * or a packet destined to a local-only group.
1090 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1091 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1096 * Source address check: do not forward packets with unspecified
1097 * source. It was discussed in July 2000, on ipngwg mailing list.
1098 * This is rather more serious than unicast cases, because some
1099 * MLD packets can be sent with the unspecified source address
1100 * (although such packets must normally set 1 to the hop limit field).
1102 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1103 IP6STAT_INC(ip6s_cantforward);
1104 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1105 V_ip6_log_time = time_uptime;
1108 "from %s to %s nxt %d received on %s\n",
1109 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1110 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1112 if_name(m->m_pkthdr.rcvif));
1120 * Determine forwarding mifs from the forwarding cache table
1122 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1123 MRT6STAT_INC(mrt6s_mfc_lookups);
1125 /* Entry exists, so forward if necessary */
1128 return (ip6_mdq(m, ifp, rt));
1132 * If we don't have a route for packet's origin,
1133 * Make a copy of the packet & send message to routing daemon.
1135 MRT6STAT_INC(mrt6s_no_route);
1136 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1137 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1138 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1141 * Allocate mbufs early so that we don't do extra work if we
1142 * are just going to fail anyway.
1144 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1149 mb0 = m_copy(m, 0, M_COPYALL);
1151 * Pullup packet header if needed before storing it,
1152 * as other references may modify it in the meantime.
1154 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1155 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1157 free(rte, M_MRTABLE6);
1162 /* is there an upcall waiting for this packet? */
1163 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1164 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1165 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1166 &rt->mf6c_origin.sin6_addr) &&
1167 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1168 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1175 struct omrt6msg *oim;
1177 /* no upcall, so make a new entry */
1178 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1180 free(rte, M_MRTABLE6);
1186 * Make a copy of the header to send to the user
1189 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1191 free(rte, M_MRTABLE6);
1193 free(rt, M_MRTABLE6);
1199 * Send message to routing daemon
1201 sin6.sin6_addr = ip6->ip6_src;
1206 switch (V_ip6_mrouter_ver) {
1209 oim = mtod(mm, struct omrt6msg *);
1210 oim->im6_msgtype = MRT6MSG_NOCACHE;
1215 im = mtod(mm, struct mrt6msg *);
1216 im->im6_msgtype = MRT6MSG_NOCACHE;
1220 free(rte, M_MRTABLE6);
1222 free(rt, M_MRTABLE6);
1227 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1228 for (mifp = mif6table, mifi = 0;
1229 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1232 switch (V_ip6_mrouter_ver) {
1235 oim->im6_mif = mifi;
1243 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1244 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1245 "socket queue full\n");
1246 MRT6STAT_INC(mrt6s_upq_sockfull);
1247 free(rte, M_MRTABLE6);
1249 free(rt, M_MRTABLE6);
1254 MRT6STAT_INC(mrt6s_upcalls);
1256 /* insert new entry at head of hash chain */
1257 bzero(rt, sizeof(*rt));
1258 rt->mf6c_origin.sin6_family = AF_INET6;
1259 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1260 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1261 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1262 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1263 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1264 rt->mf6c_expire = UPCALL_EXPIRE;
1266 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1268 /* link into table */
1269 rt->mf6c_next = mf6ctable[hash];
1270 mf6ctable[hash] = rt;
1271 /* Add this entry to the end of the queue */
1272 rt->mf6c_stall = rte;
1274 /* determine if q has overflowed */
1278 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1279 if (++npkts > MAX_UPQ6) {
1280 MRT6STAT_INC(mrt6s_upq_ovflw);
1281 free(rte, M_MRTABLE6);
1287 /* Add this entry to the end of the queue */
1294 #ifdef UPCALL_TIMING
1296 #endif /* UPCALL_TIMING */
1304 * Clean up cache entries if upcalls are not serviced
1305 * Call from the Slow Timeout mechanism, every half second.
1308 expire_upcalls(void *unused)
1311 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1314 struct mf6c *mfc, **nptr;
1318 for (i = 0; i < MF6CTBLSIZ; i++) {
1319 if (n6expire[i] == 0)
1321 nptr = &mf6ctable[i];
1322 while ((mfc = *nptr) != NULL) {
1323 rte = mfc->mf6c_stall;
1325 * Skip real cache entries
1326 * Make sure it wasn't marked to not expire (shouldn't happen)
1330 mfc->mf6c_expire != 0 &&
1331 --mfc->mf6c_expire == 0) {
1332 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1333 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1334 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1336 * drop all the packets
1337 * free the mbuf with the pkt, if, timing info
1340 struct rtdetq *n = rte->next;
1342 free(rte, M_MRTABLE6);
1344 } while (rte != NULL);
1345 MRT6STAT_INC(mrt6s_cache_cleanups);
1348 *nptr = mfc->mf6c_next;
1349 free(mfc, M_MRTABLE6);
1351 nptr = &mfc->mf6c_next;
1356 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1357 expire_upcalls, NULL);
1361 * Packet forwarding routine once entry in the cache is made
1364 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1366 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1369 int plen = m->m_pkthdr.len;
1370 struct in6_addr src0, dst0; /* copies for local work */
1371 u_int32_t iszone, idzone, oszone, odzone;
1375 * Macro to send packet on mif. Since RSVP packets don't get counted on
1376 * input, they shouldn't get counted on output, so statistics keeping is
1380 #define MC6_SEND(ip6, mifp, m) do { \
1381 if ((mifp)->m6_flags & MIFF_REGISTER) \
1382 register_send((ip6), (mifp), (m)); \
1384 phyint_send((ip6), (mifp), (m)); \
1385 } while (/*CONSTCOND*/ 0)
1388 * Don't forward if it didn't arrive from the parent mif
1391 mifi = rt->mf6c_parent;
1392 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1393 /* came in the wrong interface */
1394 MRT6_DLOG(DEBUG_FORWARD,
1395 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1396 mifi, mif6table[mifi].m6_ifp->if_index);
1397 MRT6STAT_INC(mrt6s_wrong_if);
1398 rt->mf6c_wrong_if++;
1400 * If we are doing PIM processing, and we are forwarding
1401 * packets on this interface, send a message to the
1404 /* have to make sure this is a valid mif */
1405 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1406 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1408 * Check the M_LOOP flag to avoid an
1409 * unnecessary PIM assert.
1410 * XXX: M_LOOP is an ad-hoc hack...
1412 static struct sockaddr_in6 sin6 =
1413 { sizeof(sin6), AF_INET6 };
1418 struct omrt6msg *oim;
1421 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1424 mm->m_len < sizeof(struct ip6_hdr)))
1425 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1433 switch (V_ip6_mrouter_ver) {
1436 oim = mtod(mm, struct omrt6msg *);
1437 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1442 im = mtod(mm, struct mrt6msg *);
1443 im->im6_msgtype = MRT6MSG_WRONGMIF;
1451 for (mifp = mif6table, iif = 0;
1452 iif < nummifs && mifp &&
1453 mifp->m6_ifp != ifp;
1457 switch (V_ip6_mrouter_ver) {
1461 sin6.sin6_addr = oim->im6_src;
1466 sin6.sin6_addr = im->im6_src;
1470 MRT6STAT_INC(mrt6s_upcalls);
1472 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1473 MRT6_DLOG(DEBUG_ANY,
1474 "ip6_mrouter socket queue full");
1475 MRT6STAT_INC(mrt6s_upq_sockfull);
1477 } /* if socket Q full */
1480 } /* if wrong iif */
1482 /* If I sourced this packet, it counts as output, else it was input. */
1483 if (m->m_pkthdr.rcvif == NULL) {
1484 /* XXX: is rcvif really NULL when output?? */
1485 mif6table[mifi].m6_pkt_out++;
1486 mif6table[mifi].m6_bytes_out += plen;
1488 mif6table[mifi].m6_pkt_in++;
1489 mif6table[mifi].m6_bytes_in += plen;
1492 rt->mf6c_byte_cnt += plen;
1495 * For each mif, forward a copy of the packet if there are group
1496 * members downstream on the interface.
1498 src0 = ip6->ip6_src;
1499 dst0 = ip6->ip6_dst;
1500 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1501 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1502 IP6STAT_INC(ip6s_badscope);
1505 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1506 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1508 * check if the outgoing packet is going to break
1510 * XXX For packets through PIM register tunnel
1511 * interface, we believe a routing daemon.
1513 if (!(mif6table[rt->mf6c_parent].m6_flags &
1515 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1516 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1518 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1522 IP6STAT_INC(ip6s_badscope);
1528 mifp->m6_bytes_out += plen;
1529 MC6_SEND(ip6, mifp, m);
1536 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1539 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1541 struct mbuf *mb_copy;
1542 struct ifnet *ifp = mifp->m6_ifp;
1547 * Make a new reference to the packet; make sure that
1548 * the IPv6 header is actually copied, not just referenced,
1549 * so that ip6_output() only scribbles on the copy.
1551 mb_copy = m_copy(m, 0, M_COPYALL);
1553 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1554 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1555 if (mb_copy == NULL) {
1558 /* set MCAST flag to the outgoing packet */
1559 mb_copy->m_flags |= M_MCAST;
1562 * If we sourced the packet, call ip6_output since we may devide
1563 * the packet into fragments when the packet is too big for the
1564 * outgoing interface.
1565 * Otherwise, we can simply send the packet to the interface
1568 if (m->m_pkthdr.rcvif == NULL) {
1569 struct ip6_moptions im6o;
1571 im6o.im6o_multicast_ifp = ifp;
1572 /* XXX: ip6_output will override ip6->ip6_hlim */
1573 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1574 im6o.im6o_multicast_loop = 1;
1575 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1578 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1579 (uint16_t)(mifp - mif6table), error);
1584 * If configured to loop back multicasts by default,
1585 * loop back a copy now.
1588 ip6_mloopback(ifp, m);
1591 * Put the packet into the sending queue of the outgoing interface
1592 * if it would fit in the MTU of the interface.
1594 linkmtu = IN6_LINKMTU(ifp);
1595 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1596 struct sockaddr_in6 dst6;
1598 bzero(&dst6, sizeof(dst6));
1599 dst6.sin6_len = sizeof(struct sockaddr_in6);
1600 dst6.sin6_family = AF_INET6;
1601 dst6.sin6_addr = ip6->ip6_dst;
1603 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1605 * We just call if_output instead of nd6_output here, since
1606 * we need no ND for a multicast forwarded packet...right?
1608 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1609 error = (*ifp->if_output)(ifp, mb_copy,
1610 (struct sockaddr *)&dst6, NULL);
1611 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1612 (uint16_t)(mifp - mif6table), error);
1615 * pMTU discovery is intentionally disabled by default, since
1616 * various router may notify pMTU in multicast, which can be
1617 * a DDoS to a router
1619 if (V_ip6_mcast_pmtu)
1620 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1622 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1623 "g %s size %d (discarded)", if_name(ifp),
1624 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1625 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1626 mb_copy->m_pkthdr.len);
1627 m_freem(mb_copy); /* simply discard the packet */
1633 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1636 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1639 int i, len = m->m_pkthdr.len;
1640 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1641 struct mrt6msg *im6;
1643 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1644 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1645 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1646 PIM6STAT_INC(pim6s_snd_registers);
1648 /* Make a copy of the packet to send to the user level process. */
1649 mm = m_gethdr(M_NOWAIT, MT_DATA);
1652 mm->m_data += max_linkhdr;
1653 mm->m_len = sizeof(struct ip6_hdr);
1655 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1659 i = MHLEN - M_LEADINGSPACE(mm);
1662 mm = m_pullup(mm, i);
1665 /* TODO: check it! */
1666 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1669 * Send message to routing daemon
1671 sin6.sin6_addr = ip6->ip6_src;
1673 im6 = mtod(mm, struct mrt6msg *);
1674 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1677 im6->im6_mif = mif - mif6table;
1679 /* iif info is not given for reg. encap.n */
1680 MRT6STAT_INC(mrt6s_upcalls);
1682 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1683 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1684 MRT6STAT_INC(mrt6s_upq_sockfull);
1691 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1692 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1696 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1700 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1702 if (proto != IPPROTO_PIM)
1703 return 0; /* not for us; reject the datagram. */
1705 return 64; /* claim the datagram. */
1709 * PIM sparse mode hook
1710 * Receives the pim control messages, and passes them up to the listening
1711 * socket, using rip6_input.
1712 * The only message processed is the REGISTER pim message; the pim header
1713 * is stripped off, and the inner packet is passed to register_mforward.
1716 pim6_input(struct mbuf **mp, int *offp, int proto)
1718 struct pim *pim; /* pointer to a pim struct */
1719 struct ip6_hdr *ip6;
1721 struct mbuf *m = *mp;
1725 PIM6STAT_INC(pim6s_rcv_total);
1727 ip6 = mtod(m, struct ip6_hdr *);
1728 pimlen = m->m_pkthdr.len - *offp;
1733 if (pimlen < PIM_MINLEN) {
1734 PIM6STAT_INC(pim6s_rcv_tooshort);
1735 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1737 return (IPPROTO_DONE);
1741 * if the packet is at least as big as a REGISTER, go ahead
1742 * and grab the PIM REGISTER header size, to avoid another
1743 * possible m_pullup() later.
1745 * PIM_MINLEN == pimhdr + u_int32 == 8
1746 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1748 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1751 * Make sure that the IP6 and PIM headers in contiguous memory, and
1752 * possibly the PIM REGISTER header
1754 #ifndef PULLDOWN_TEST
1755 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1756 /* adjust pointer */
1757 ip6 = mtod(m, struct ip6_hdr *);
1759 /* adjust mbuf to point to the PIM header */
1760 pim = (struct pim *)((caddr_t)ip6 + off);
1762 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1764 PIM6STAT_INC(pim6s_rcv_tooshort);
1765 return (IPPROTO_DONE);
1769 #define PIM6_CHECKSUM
1770 #ifdef PIM6_CHECKSUM
1775 * Validate checksum.
1776 * If PIM REGISTER, exclude the data packet
1778 if (pim->pim_type == PIM_REGISTER)
1779 cksumlen = PIM_MINLEN;
1783 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1784 PIM6STAT_INC(pim6s_rcv_badsum);
1785 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1787 return (IPPROTO_DONE);
1790 #endif /* PIM_CHECKSUM */
1792 /* PIM version check */
1793 if (pim->pim_ver != PIM_VERSION) {
1794 PIM6STAT_INC(pim6s_rcv_badversion);
1795 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1796 "incorrect version %d, expecting %d",
1797 pim->pim_ver, PIM_VERSION);
1799 return (IPPROTO_DONE);
1802 if (pim->pim_type == PIM_REGISTER) {
1804 * since this is a REGISTER, we'll make a copy of the register
1805 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1808 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1811 struct ip6_hdr *eip6;
1815 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1818 PIM6STAT_INC(pim6s_rcv_registers);
1820 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1821 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1824 return (IPPROTO_DONE);
1827 reghdr = (u_int32_t *)(pim + 1);
1829 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1830 goto pim6_input_to_daemon;
1835 if (pimlen < PIM6_REG_MINLEN) {
1836 PIM6STAT_INC(pim6s_rcv_tooshort);
1837 PIM6STAT_INC(pim6s_rcv_badregisters);
1838 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1839 "size too small %d from %s",
1840 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1842 return (IPPROTO_DONE);
1845 eip6 = (struct ip6_hdr *) (reghdr + 1);
1846 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1847 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1848 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1849 ntohs(eip6->ip6_plen));
1851 /* verify the version number of the inner packet */
1852 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1853 PIM6STAT_INC(pim6s_rcv_badregisters);
1854 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1855 "of the inner packet",
1856 (eip6->ip6_vfc & IPV6_VERSION));
1858 return (IPPROTO_DONE);
1861 /* verify the inner packet is destined to a mcast group */
1862 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1863 PIM6STAT_INC(pim6s_rcv_badregisters);
1864 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1865 "is not multicast %s",
1866 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1868 return (IPPROTO_DONE);
1872 * make a copy of the whole header to pass to the daemon later.
1874 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1876 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1877 "could not copy register head");
1879 return (IPPROTO_DONE);
1883 * forward the inner ip6 packet; point m_data at the inner ip6.
1885 m_adj(m, off + PIM_MINLEN);
1886 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1887 "src %s, dst %s, mif %d",
1888 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1889 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1891 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1892 dst.sin6_family, 0);
1894 /* prepare the register head to send to the mrouting daemon */
1899 * Pass the PIM message up to the daemon; if it is a register message
1900 * pass the 'head' only up to the daemon. This includes the
1901 * encapsulator ip6 header, pim header, register header and the
1902 * encapsulated ip6 header.
1904 pim6_input_to_daemon:
1905 rip6_input(&m, offp, proto);
1906 return (IPPROTO_DONE);
1910 ip6_mroute_modevent(module_t mod, int type, void *unused)
1915 MROUTER6_LOCK_INIT();
1919 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
1921 (const struct protosw *)&in6_pim_protosw, NULL);
1922 if (pim6_encap_cookie == NULL) {
1923 printf("ip6_mroute: unable to attach pim6 encap\n");
1924 MIF6_LOCK_DESTROY();
1925 MFC6_LOCK_DESTROY();
1926 MROUTER6_LOCK_DESTROY();
1930 ip6_mforward = X_ip6_mforward;
1931 ip6_mrouter_done = X_ip6_mrouter_done;
1932 ip6_mrouter_get = X_ip6_mrouter_get;
1933 ip6_mrouter_set = X_ip6_mrouter_set;
1934 mrt6_ioctl = X_mrt6_ioctl;
1938 if (V_ip6_mrouter != NULL)
1941 if (pim6_encap_cookie) {
1942 encap_detach(pim6_encap_cookie);
1943 pim6_encap_cookie = NULL;
1945 X_ip6_mrouter_done();
1946 ip6_mforward = NULL;
1947 ip6_mrouter_done = NULL;
1948 ip6_mrouter_get = NULL;
1949 ip6_mrouter_set = NULL;
1952 MIF6_LOCK_DESTROY();
1953 MFC6_LOCK_DESTROY();
1954 MROUTER6_LOCK_DESTROY();
1958 return (EOPNOTSUPP);
1964 static moduledata_t ip6_mroutemod = {
1966 ip6_mroute_modevent,
1970 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);