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, CTLFLAG_RW, 0, "PIM");
160 static struct mrt6stat mrt6stat;
161 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
163 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
165 #define MRT6STAT_INC(name) mrt6stat.name += 1
166 #define NO_RTE_FOUND 0x1
167 #define RTE_FOUND 0x2
169 static struct mtx mrouter6_mtx;
170 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
171 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
172 #define MROUTER6_LOCK_ASSERT() do { \
173 mtx_assert(&mrouter6_mtx, MA_OWNED); \
174 NET_ASSERT_GIANT(); \
176 #define MROUTER6_LOCK_INIT() \
177 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
178 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
180 static struct mf6c *mf6ctable[MF6CTBLSIZ];
181 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
182 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
183 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
184 "netinet6/ip6_mroute.h)");
186 static struct mtx mfc6_mtx;
187 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
188 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
189 #define MFC6_LOCK_ASSERT() do { \
190 mtx_assert(&mfc6_mtx, MA_OWNED); \
191 NET_ASSERT_GIANT(); \
193 #define MFC6_LOCK_INIT() \
194 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
195 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
197 static u_char n6expire[MF6CTBLSIZ];
199 static struct mif6 mif6table[MAXMIFS];
201 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
203 struct mif6_sctl *out;
206 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
208 for (int i = 0; i < MAXMIFS; i++) {
209 out[i].m6_flags = mif6table[i].m6_flags;
210 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
211 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
212 if (mif6table[i].m6_ifp != NULL)
213 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
216 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
217 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
218 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
219 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
221 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
225 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD,
226 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
227 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
228 "netinet6/ip6_mroute.h)");
230 static struct mtx mif6_mtx;
231 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
232 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
233 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
234 #define MIF6_LOCK_INIT() \
235 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
236 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
239 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
240 #define V_mrt6debug VNET(mrt6debug)
241 #define DEBUG_MFC 0x02
242 #define DEBUG_FORWARD 0x04
243 #define DEBUG_EXPIRE 0x08
244 #define DEBUG_XMIT 0x10
245 #define DEBUG_REG 0x20
246 #define DEBUG_PIM 0x40
247 #define DEBUG_ERR 0x80
248 #define DEBUG_ANY 0x7f
249 #define MRT6_DLOG(m, fmt, ...) \
250 if (V_mrt6debug & (m)) \
251 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
252 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
254 #define MRT6_DLOG(m, fmt, ...)
257 static void expire_upcalls(void *);
258 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
259 #define UPCALL_EXPIRE 6 /* number of timeouts */
262 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
266 * 'Interfaces' associated with decapsulator (so we can tell
267 * packets that went through it from ones that get reflected
268 * by a broken gateway). Different from IPv4 register_if,
269 * these interfaces are linked into the system ifnet list,
270 * because per-interface IPv6 statistics are maintained in
271 * ifp->if_afdata. But it does not have any routes point
272 * to them. I.e., packets can't be sent this way. They
273 * only exist as a placeholder for multicast source
276 static struct ifnet *multicast_register_if6;
278 #define ENCAP_HOPS 64
283 static mifi_t nummifs = 0;
284 static mifi_t reg_mif_num = (mifi_t)-1;
286 static struct pim6stat pim6stat;
287 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
289 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
291 #define PIM6STAT_INC(name) pim6stat.name += 1
292 VNET_DEFINE_STATIC(int, pim6);
293 #define V_pim6 VNET(pim6)
296 * Hash function for a source, group entry
298 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
299 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
300 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
301 (g).s6_addr32[2] ^ (g).s6_addr32[3])
304 * Find a route for a given origin IPv6 address and Multicast group address.
306 #define MF6CFIND(o, g, rt) do { \
307 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
310 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
311 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
312 (_rt->mf6c_stall == NULL)) { \
316 _rt = _rt->mf6c_next; \
319 MRT6STAT_INC(mrt6s_mfc_misses); \
321 } while (/*CONSTCOND*/ 0)
324 * Macros to compute elapsed time efficiently
325 * Borrowed from Van Jacobson's scheduling code
326 * XXX: replace with timersub() ?
328 #define TV_DELTA(a, b, delta) do { \
331 delta = (a).tv_usec - (b).tv_usec; \
332 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
341 delta += (1000000 * xxs); \
344 } while (/*CONSTCOND*/ 0)
346 /* XXX: replace with timercmp(a, b, <) ? */
347 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
348 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
351 #define UPCALL_MAX 50
352 static u_long upcall_data[UPCALL_MAX + 1];
353 static void collate();
354 #endif /* UPCALL_TIMING */
356 static int ip6_mrouter_init(struct socket *, int, int);
357 static int add_m6fc(struct mf6cctl *);
358 static int add_m6if(struct mif6ctl *);
359 static int del_m6fc(struct mf6cctl *);
360 static int del_m6if(mifi_t *);
361 static int del_m6if_locked(mifi_t *);
362 static int get_mif6_cnt(struct sioc_mif_req6 *);
363 static int get_sg_cnt(struct sioc_sg_req6 *);
365 static struct callout expire_upcalls_ch;
367 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
368 int X_ip6_mrouter_done(void);
369 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
370 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
371 int X_mrt6_ioctl(u_long, caddr_t);
374 * Handle MRT setsockopt commands to modify the multicast routing tables.
377 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
385 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
388 switch (sopt->sopt_name) {
393 error = sooptcopyin(sopt, &optval, sizeof(optval),
397 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
400 error = X_ip6_mrouter_done();
403 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
406 error = add_m6if(&mifc);
409 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
412 error = add_m6fc(&mfcc);
415 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
418 error = del_m6fc(&mfcc);
421 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
424 error = del_m6if(&mifi);
427 error = sooptcopyin(sopt, &optval, sizeof(optval),
431 error = set_pim6(&optval);
442 * Handle MRT getsockopt commands
445 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
449 if (so != V_ip6_mrouter)
452 switch (sopt->sopt_name) {
454 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
461 * Handle ioctl commands to obtain information from the cache
464 X_mrt6_ioctl(u_long cmd, caddr_t data)
471 case SIOCGETSGCNT_IN6:
472 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
475 case SIOCGETMIFCNT_IN6:
476 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
487 * returns the packet, byte, rpf-failure count for the source group provided
490 get_sg_cnt(struct sioc_sg_req6 *req)
499 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
503 req->pktcnt = rt->mf6c_pkt_cnt;
504 req->bytecnt = rt->mf6c_byte_cnt;
505 req->wrong_if = rt->mf6c_wrong_if;
514 * returns the input and output packet and byte counts on the mif provided
517 get_mif6_cnt(struct sioc_mif_req6 *req)
527 if (mifi >= nummifs) {
530 req->icount = mif6table[mifi].m6_pkt_in;
531 req->ocount = mif6table[mifi].m6_pkt_out;
532 req->ibytes = mif6table[mifi].m6_bytes_in;
533 req->obytes = mif6table[mifi].m6_bytes_out;
544 if ((*i != 1) && (*i != 0))
553 * Enable multicast routing
556 ip6_mrouter_init(struct socket *so, int v, int cmd)
559 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
560 so->so_type, so->so_proto->pr_protocol);
562 if (so->so_type != SOCK_RAW ||
563 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
567 return (ENOPROTOOPT);
571 if (V_ip6_mrouter != NULL) {
577 V_ip6_mrouter_ver = cmd;
579 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
580 bzero((caddr_t)n6expire, sizeof(n6expire));
582 V_pim6 = 0;/* used for stubbing out/in pim stuff */
584 callout_init(&expire_upcalls_ch, 0);
585 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
586 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 */
627 callout_stop(&expire_upcalls_ch);
630 * Free all multicast forwarding cache entries.
633 for (i = 0; i < MF6CTBLSIZ; i++) {
638 for (rte = rt->mf6c_stall; rte != NULL; ) {
639 struct rtdetq *n = rte->next;
642 free(rte, M_MRTABLE6);
647 free(frt, M_MRTABLE6);
650 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
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)
686 if (mifcp->mif6c_mifi >= MAXMIFS) {
690 mifp = mif6table + mifcp->mif6c_mifi;
691 if (mifp->m6_ifp != NULL) {
693 return (EADDRINUSE); /* XXX: is it appropriate? */
695 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
700 ifp = ifnet_byindex(mifcp->mif6c_pifi);
702 if (mifcp->mif6c_flags & MIFF_REGISTER) {
703 if (reg_mif_num == (mifi_t)-1) {
704 ifp = if_alloc(IFT_OTHER);
706 if_initname(ifp, "register_mif", 0);
707 ifp->if_flags |= IFF_LOOPBACK;
709 multicast_register_if6 = ifp;
710 reg_mif_num = mifcp->mif6c_mifi;
712 * it is impossible to guess the ifindex of the
713 * register interface. So mif6c_pifi is automatically
716 mifcp->mif6c_pifi = ifp->if_index;
718 ifp = multicast_register_if6;
721 /* Make sure the interface supports multicast */
722 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
727 error = if_allmulti(ifp, 1);
734 mifp->m6_flags = mifcp->mif6c_flags;
737 /* initialize per mif pkt counters */
739 mifp->m6_pkt_out = 0;
740 mifp->m6_bytes_in = 0;
741 mifp->m6_bytes_out = 0;
743 /* Adjust nummifs up if the mifi is higher than nummifs */
744 if (nummifs <= mifcp->mif6c_mifi)
745 nummifs = mifcp->mif6c_mifi + 1;
748 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
755 * Delete a mif from the mif table
758 del_m6if_locked(mifi_t *mifip)
760 struct mif6 *mifp = mif6table + *mifip;
766 if (*mifip >= nummifs)
768 if (mifp->m6_ifp == NULL)
771 if (!(mifp->m6_flags & MIFF_REGISTER)) {
772 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
776 if (reg_mif_num != (mifi_t)-1 &&
777 multicast_register_if6 != NULL) {
778 if_detach(multicast_register_if6);
779 if_free(multicast_register_if6);
780 reg_mif_num = (mifi_t)-1;
781 multicast_register_if6 = NULL;
785 bzero((caddr_t)mifp, sizeof(*mifp));
787 /* Adjust nummifs down */
788 for (mifi = nummifs; mifi > 0; mifi--)
789 if (mif6table[mifi - 1].m6_ifp)
792 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
798 del_m6if(mifi_t *mifip)
803 cc = del_m6if_locked(mifip);
813 add_m6fc(struct mf6cctl *mfccp)
819 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
823 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
824 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
826 /* If an entry already exists, just update the fields */
828 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
829 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
830 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
831 mfccp->mf6cc_parent);
833 rt->mf6c_parent = mfccp->mf6cc_parent;
834 rt->mf6c_ifset = mfccp->mf6cc_ifset;
841 * Find the entry for which the upcall was made and update
843 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
844 mfccp->mf6cc_mcastgrp.sin6_addr);
845 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
846 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
847 &mfccp->mf6cc_origin.sin6_addr) &&
848 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
849 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
850 (rt->mf6c_stall != NULL)) {
854 "add_m6fc: %s o %s g %s p %x dbx %p\n",
855 "multiple kernel entries",
857 &mfccp->mf6cc_origin.sin6_addr),
859 &mfccp->mf6cc_mcastgrp.sin6_addr),
860 mfccp->mf6cc_parent, rt->mf6c_stall);
862 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
864 &mfccp->mf6cc_origin.sin6_addr),
866 &mfccp->mf6cc_mcastgrp.sin6_addr),
867 mfccp->mf6cc_parent, rt->mf6c_stall);
869 rt->mf6c_origin = mfccp->mf6cc_origin;
870 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
871 rt->mf6c_parent = mfccp->mf6cc_parent;
872 rt->mf6c_ifset = mfccp->mf6cc_ifset;
873 /* initialize pkt counters per src-grp */
874 rt->mf6c_pkt_cnt = 0;
875 rt->mf6c_byte_cnt = 0;
876 rt->mf6c_wrong_if = 0;
878 rt->mf6c_expire = 0; /* Don't clean this guy up */
881 /* free packets Qed at the end of this entry */
882 for (rte = rt->mf6c_stall; rte != NULL; ) {
883 struct rtdetq *n = rte->next;
884 ip6_mdq(rte->m, rte->ifp, rt);
888 #endif /* UPCALL_TIMING */
889 free(rte, M_MRTABLE6);
892 rt->mf6c_stall = NULL;
897 * It is possible that an entry is being inserted without an upcall
900 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
901 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
902 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
903 mfccp->mf6cc_parent);
905 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
907 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
908 &mfccp->mf6cc_origin.sin6_addr)&&
909 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
910 &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) {
1049 * IPv6 multicast forwarding function. This function assumes that the packet
1050 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1051 * pointed to by "ifp", and the packet is to be relayed to other networks
1052 * that have members of the packet's destination IPv6 multicast group.
1054 * The packet is returned unscathed to the caller, unless it is
1055 * erroneous, in which case a non-zero return value tells the caller to
1058 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1059 * this function is called in the originating context (i.e., not when
1060 * forwarding a packet from other node). ip6_output(), which is currently the
1061 * only function that calls this function is called in the originating context,
1062 * explicitly ensures this condition. It is caller's responsibility to ensure
1063 * that if this function is called from somewhere else in the originating
1064 * context in the future.
1067 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1076 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1077 #ifdef UPCALL_TIMING
1081 #endif /* UPCALL_TIMING */
1083 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1084 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1085 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1088 * Don't forward a packet with Hop limit of zero or one,
1089 * or a packet destined to a local-only group.
1091 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1092 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1097 * Source address check: do not forward packets with unspecified
1098 * source. It was discussed in July 2000, on ipngwg mailing list.
1099 * This is rather more serious than unicast cases, because some
1100 * MLD packets can be sent with the unspecified source address
1101 * (although such packets must normally set 1 to the hop limit field).
1103 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1104 IP6STAT_INC(ip6s_cantforward);
1105 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1106 V_ip6_log_time = time_uptime;
1109 "from %s to %s nxt %d received on %s\n",
1110 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1111 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1113 if_name(m->m_pkthdr.rcvif));
1121 * Determine forwarding mifs from the forwarding cache table
1123 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1124 MRT6STAT_INC(mrt6s_mfc_lookups);
1126 /* Entry exists, so forward if necessary */
1129 return (ip6_mdq(m, ifp, rt));
1133 * If we don't have a route for packet's origin,
1134 * Make a copy of the packet & send message to routing daemon.
1136 MRT6STAT_INC(mrt6s_no_route);
1137 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1138 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1139 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1142 * Allocate mbufs early so that we don't do extra work if we
1143 * are just going to fail anyway.
1145 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1150 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1152 * Pullup packet header if needed before storing it,
1153 * as other references may modify it in the meantime.
1155 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1156 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1158 free(rte, M_MRTABLE6);
1163 /* is there an upcall waiting for this packet? */
1164 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1165 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1166 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1167 &rt->mf6c_origin.sin6_addr) &&
1168 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1169 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1176 struct omrt6msg *oim;
1178 /* no upcall, so make a new entry */
1179 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1181 free(rte, M_MRTABLE6);
1187 * Make a copy of the header to send to the user
1190 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
1192 free(rte, M_MRTABLE6);
1194 free(rt, M_MRTABLE6);
1200 * Send message to routing daemon
1202 sin6.sin6_addr = ip6->ip6_src;
1207 switch (V_ip6_mrouter_ver) {
1210 oim = mtod(mm, struct omrt6msg *);
1211 oim->im6_msgtype = MRT6MSG_NOCACHE;
1216 im = mtod(mm, struct mrt6msg *);
1217 im->im6_msgtype = MRT6MSG_NOCACHE;
1221 free(rte, M_MRTABLE6);
1223 free(rt, M_MRTABLE6);
1228 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1229 for (mifp = mif6table, mifi = 0;
1230 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1233 switch (V_ip6_mrouter_ver) {
1236 oim->im6_mif = mifi;
1244 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1245 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1246 "socket queue full\n");
1247 MRT6STAT_INC(mrt6s_upq_sockfull);
1248 free(rte, M_MRTABLE6);
1250 free(rt, M_MRTABLE6);
1255 MRT6STAT_INC(mrt6s_upcalls);
1257 /* insert new entry at head of hash chain */
1258 bzero(rt, sizeof(*rt));
1259 rt->mf6c_origin.sin6_family = AF_INET6;
1260 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1261 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1262 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1263 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1264 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1265 rt->mf6c_expire = UPCALL_EXPIRE;
1267 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1269 /* link into table */
1270 rt->mf6c_next = mf6ctable[hash];
1271 mf6ctable[hash] = rt;
1272 /* Add this entry to the end of the queue */
1273 rt->mf6c_stall = rte;
1275 /* determine if q has overflowed */
1279 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1280 if (++npkts > MAX_UPQ6) {
1281 MRT6STAT_INC(mrt6s_upq_ovflw);
1282 free(rte, M_MRTABLE6);
1288 /* Add this entry to the end of the queue */
1295 #ifdef UPCALL_TIMING
1297 #endif /* UPCALL_TIMING */
1305 * Clean up cache entries if upcalls are not serviced
1306 * Call from the Slow Timeout mechanism, every half second.
1309 expire_upcalls(void *unused)
1312 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1315 struct mf6c *mfc, **nptr;
1319 for (i = 0; i < MF6CTBLSIZ; i++) {
1320 if (n6expire[i] == 0)
1322 nptr = &mf6ctable[i];
1323 while ((mfc = *nptr) != NULL) {
1324 rte = mfc->mf6c_stall;
1326 * Skip real cache entries
1327 * Make sure it wasn't marked to not expire (shouldn't happen)
1331 mfc->mf6c_expire != 0 &&
1332 --mfc->mf6c_expire == 0) {
1333 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1334 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1335 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1337 * drop all the packets
1338 * free the mbuf with the pkt, if, timing info
1341 struct rtdetq *n = rte->next;
1343 free(rte, M_MRTABLE6);
1345 } while (rte != NULL);
1346 MRT6STAT_INC(mrt6s_cache_cleanups);
1349 *nptr = mfc->mf6c_next;
1350 free(mfc, M_MRTABLE6);
1352 nptr = &mfc->mf6c_next;
1357 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1358 expire_upcalls, NULL);
1362 * Packet forwarding routine once entry in the cache is made
1365 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1367 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1370 int plen = m->m_pkthdr.len;
1371 struct in6_addr src0, dst0; /* copies for local work */
1372 u_int32_t iszone, idzone, oszone, odzone;
1376 * Macro to send packet on mif. Since RSVP packets don't get counted on
1377 * input, they shouldn't get counted on output, so statistics keeping is
1381 #define MC6_SEND(ip6, mifp, m) do { \
1382 if ((mifp)->m6_flags & MIFF_REGISTER) \
1383 register_send((ip6), (mifp), (m)); \
1385 phyint_send((ip6), (mifp), (m)); \
1386 } while (/*CONSTCOND*/ 0)
1389 * Don't forward if it didn't arrive from the parent mif
1392 mifi = rt->mf6c_parent;
1393 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1394 /* came in the wrong interface */
1395 MRT6_DLOG(DEBUG_FORWARD,
1396 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1397 mifi, mif6table[mifi].m6_ifp->if_index);
1398 MRT6STAT_INC(mrt6s_wrong_if);
1399 rt->mf6c_wrong_if++;
1401 * If we are doing PIM processing, and we are forwarding
1402 * packets on this interface, send a message to the
1405 /* have to make sure this is a valid mif */
1406 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1407 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1409 * Check the M_LOOP flag to avoid an
1410 * unnecessary PIM assert.
1411 * XXX: M_LOOP is an ad-hoc hack...
1413 static struct sockaddr_in6 sin6 =
1414 { sizeof(sin6), AF_INET6 };
1419 struct omrt6msg *oim;
1422 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
1426 mm->m_len < sizeof(struct ip6_hdr)))
1427 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1435 switch (V_ip6_mrouter_ver) {
1438 oim = mtod(mm, struct omrt6msg *);
1439 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1444 im = mtod(mm, struct mrt6msg *);
1445 im->im6_msgtype = MRT6MSG_WRONGMIF;
1453 for (mifp = mif6table, iif = 0;
1454 iif < nummifs && mifp &&
1455 mifp->m6_ifp != ifp;
1459 switch (V_ip6_mrouter_ver) {
1463 sin6.sin6_addr = oim->im6_src;
1468 sin6.sin6_addr = im->im6_src;
1472 MRT6STAT_INC(mrt6s_upcalls);
1474 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1475 MRT6_DLOG(DEBUG_ANY,
1476 "ip6_mrouter socket queue full");
1477 MRT6STAT_INC(mrt6s_upq_sockfull);
1479 } /* if socket Q full */
1482 } /* if wrong iif */
1484 /* If I sourced this packet, it counts as output, else it was input. */
1485 if (m->m_pkthdr.rcvif == NULL) {
1486 /* XXX: is rcvif really NULL when output?? */
1487 mif6table[mifi].m6_pkt_out++;
1488 mif6table[mifi].m6_bytes_out += plen;
1490 mif6table[mifi].m6_pkt_in++;
1491 mif6table[mifi].m6_bytes_in += plen;
1494 rt->mf6c_byte_cnt += plen;
1497 * For each mif, forward a copy of the packet if there are group
1498 * members downstream on the interface.
1500 src0 = ip6->ip6_src;
1501 dst0 = ip6->ip6_dst;
1502 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1503 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1504 IP6STAT_INC(ip6s_badscope);
1507 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1508 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1510 * check if the outgoing packet is going to break
1512 * XXX For packets through PIM register tunnel
1513 * interface, we believe a routing daemon.
1515 if (!(mif6table[rt->mf6c_parent].m6_flags &
1517 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1518 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1520 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1524 IP6STAT_INC(ip6s_badscope);
1530 mifp->m6_bytes_out += plen;
1531 MC6_SEND(ip6, mifp, m);
1538 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1541 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1543 struct mbuf *mb_copy;
1544 struct ifnet *ifp = mifp->m6_ifp;
1549 * Make a new reference to the packet; make sure that
1550 * the IPv6 header is actually copied, not just referenced,
1551 * so that ip6_output() only scribbles on the copy.
1553 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1555 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1556 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1557 if (mb_copy == NULL) {
1560 /* set MCAST flag to the outgoing packet */
1561 mb_copy->m_flags |= M_MCAST;
1564 * If we sourced the packet, call ip6_output since we may devide
1565 * the packet into fragments when the packet is too big for the
1566 * outgoing interface.
1567 * Otherwise, we can simply send the packet to the interface
1570 if (m->m_pkthdr.rcvif == NULL) {
1571 struct ip6_moptions im6o;
1573 im6o.im6o_multicast_ifp = ifp;
1574 /* XXX: ip6_output will override ip6->ip6_hlim */
1575 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1576 im6o.im6o_multicast_loop = 1;
1577 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1580 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1581 (uint16_t)(mifp - mif6table), error);
1586 * If configured to loop back multicasts by default,
1587 * loop back a copy now.
1590 ip6_mloopback(ifp, m);
1593 * Put the packet into the sending queue of the outgoing interface
1594 * if it would fit in the MTU of the interface.
1596 linkmtu = IN6_LINKMTU(ifp);
1597 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1598 struct sockaddr_in6 dst6;
1600 bzero(&dst6, sizeof(dst6));
1601 dst6.sin6_len = sizeof(struct sockaddr_in6);
1602 dst6.sin6_family = AF_INET6;
1603 dst6.sin6_addr = ip6->ip6_dst;
1605 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1607 * We just call if_output instead of nd6_output here, since
1608 * we need no ND for a multicast forwarded packet...right?
1610 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1611 error = (*ifp->if_output)(ifp, mb_copy,
1612 (struct sockaddr *)&dst6, NULL);
1613 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1614 (uint16_t)(mifp - mif6table), error);
1617 * pMTU discovery is intentionally disabled by default, since
1618 * various router may notify pMTU in multicast, which can be
1619 * a DDoS to a router
1621 if (V_ip6_mcast_pmtu)
1622 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1624 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1625 "g %s size %d (discarded)", if_name(ifp),
1626 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1627 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1628 mb_copy->m_pkthdr.len);
1629 m_freem(mb_copy); /* simply discard the packet */
1635 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1638 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1641 int i, len = m->m_pkthdr.len;
1642 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1643 struct mrt6msg *im6;
1645 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1646 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1647 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1648 PIM6STAT_INC(pim6s_snd_registers);
1650 /* Make a copy of the packet to send to the user level process. */
1651 mm = m_gethdr(M_NOWAIT, MT_DATA);
1654 mm->m_data += max_linkhdr;
1655 mm->m_len = sizeof(struct ip6_hdr);
1657 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
1661 i = MHLEN - M_LEADINGSPACE(mm);
1664 mm = m_pullup(mm, i);
1667 /* TODO: check it! */
1668 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1671 * Send message to routing daemon
1673 sin6.sin6_addr = ip6->ip6_src;
1675 im6 = mtod(mm, struct mrt6msg *);
1676 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1679 im6->im6_mif = mif - mif6table;
1681 /* iif info is not given for reg. encap.n */
1682 MRT6STAT_INC(mrt6s_upcalls);
1684 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1685 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1686 MRT6STAT_INC(mrt6s_upq_sockfull);
1693 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1694 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1698 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
1699 int proto __unused, void *arg __unused)
1702 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1703 return (8); /* claim the datagram. */
1707 * PIM sparse mode hook
1708 * Receives the pim control messages, and passes them up to the listening
1709 * socket, using rip6_input.
1710 * The only message processed is the REGISTER pim message; the pim header
1711 * is stripped off, and the inner packet is passed to register_mforward.
1714 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
1716 struct pim *pim; /* pointer to a pim struct */
1717 struct ip6_hdr *ip6;
1721 PIM6STAT_INC(pim6s_rcv_total);
1723 ip6 = mtod(m, struct ip6_hdr *);
1724 pimlen = m->m_pkthdr.len - off;
1729 if (pimlen < PIM_MINLEN) {
1730 PIM6STAT_INC(pim6s_rcv_tooshort);
1731 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1733 return (IPPROTO_DONE);
1737 * if the packet is at least as big as a REGISTER, go ahead
1738 * and grab the PIM REGISTER header size, to avoid another
1739 * possible m_pullup() later.
1741 * PIM_MINLEN == pimhdr + u_int32 == 8
1742 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1744 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1747 * Make sure that the IP6 and PIM headers in contiguous memory, and
1748 * possibly the PIM REGISTER header
1750 #ifndef PULLDOWN_TEST
1751 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1752 /* adjust pointer */
1753 ip6 = mtod(m, struct ip6_hdr *);
1755 /* adjust mbuf to point to the PIM header */
1756 pim = (struct pim *)((caddr_t)ip6 + off);
1758 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1760 PIM6STAT_INC(pim6s_rcv_tooshort);
1761 return (IPPROTO_DONE);
1765 #define PIM6_CHECKSUM
1766 #ifdef PIM6_CHECKSUM
1771 * Validate checksum.
1772 * If PIM REGISTER, exclude the data packet
1774 if (pim->pim_type == PIM_REGISTER)
1775 cksumlen = PIM_MINLEN;
1779 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1780 PIM6STAT_INC(pim6s_rcv_badsum);
1781 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1783 return (IPPROTO_DONE);
1786 #endif /* PIM_CHECKSUM */
1788 /* PIM version check */
1789 if (pim->pim_ver != PIM_VERSION) {
1790 PIM6STAT_INC(pim6s_rcv_badversion);
1791 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1792 "incorrect version %d, expecting %d",
1793 pim->pim_ver, PIM_VERSION);
1795 return (IPPROTO_DONE);
1798 if (pim->pim_type == PIM_REGISTER) {
1800 * since this is a REGISTER, we'll make a copy of the register
1801 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1804 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1807 struct ip6_hdr *eip6;
1811 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1814 PIM6STAT_INC(pim6s_rcv_registers);
1816 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1817 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1820 return (IPPROTO_DONE);
1823 reghdr = (u_int32_t *)(pim + 1);
1825 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1826 goto pim6_input_to_daemon;
1831 if (pimlen < PIM6_REG_MINLEN) {
1832 PIM6STAT_INC(pim6s_rcv_tooshort);
1833 PIM6STAT_INC(pim6s_rcv_badregisters);
1834 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1835 "size too small %d from %s",
1836 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1838 return (IPPROTO_DONE);
1841 eip6 = (struct ip6_hdr *) (reghdr + 1);
1842 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1843 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1844 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1845 ntohs(eip6->ip6_plen));
1847 /* verify the version number of the inner packet */
1848 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1849 PIM6STAT_INC(pim6s_rcv_badregisters);
1850 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1851 "of the inner packet",
1852 (eip6->ip6_vfc & IPV6_VERSION));
1854 return (IPPROTO_DONE);
1857 /* verify the inner packet is destined to a mcast group */
1858 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1859 PIM6STAT_INC(pim6s_rcv_badregisters);
1860 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1861 "is not multicast %s",
1862 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1864 return (IPPROTO_DONE);
1868 * make a copy of the whole header to pass to the daemon later.
1870 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
1872 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1873 "could not copy register head");
1875 return (IPPROTO_DONE);
1879 * forward the inner ip6 packet; point m_data at the inner ip6.
1881 m_adj(m, off + PIM_MINLEN);
1882 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1883 "src %s, dst %s, mif %d",
1884 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1885 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1887 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1888 dst.sin6_family, 0);
1890 /* prepare the register head to send to the mrouting daemon */
1895 * Pass the PIM message up to the daemon; if it is a register message
1896 * pass the 'head' only up to the daemon. This includes the
1897 * encapsulator ip6 header, pim header, register header and the
1898 * encapsulated ip6 header.
1900 pim6_input_to_daemon:
1901 return (rip6_input(&m, &off, proto));
1905 ip6_mroute_modevent(module_t mod, int type, void *unused)
1910 MROUTER6_LOCK_INIT();
1914 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
1916 if (pim6_encap_cookie == NULL) {
1917 printf("ip6_mroute: unable to attach pim6 encap\n");
1918 MIF6_LOCK_DESTROY();
1919 MFC6_LOCK_DESTROY();
1920 MROUTER6_LOCK_DESTROY();
1924 ip6_mforward = X_ip6_mforward;
1925 ip6_mrouter_done = X_ip6_mrouter_done;
1926 ip6_mrouter_get = X_ip6_mrouter_get;
1927 ip6_mrouter_set = X_ip6_mrouter_set;
1928 mrt6_ioctl = X_mrt6_ioctl;
1932 if (V_ip6_mrouter != NULL)
1935 if (pim6_encap_cookie) {
1936 ip6_encap_detach(pim6_encap_cookie);
1937 pim6_encap_cookie = NULL;
1939 X_ip6_mrouter_done();
1940 ip6_mforward = NULL;
1941 ip6_mrouter_done = NULL;
1942 ip6_mrouter_get = NULL;
1943 ip6_mrouter_set = NULL;
1946 MIF6_LOCK_DESTROY();
1947 MFC6_LOCK_DESTROY();
1948 MROUTER6_LOCK_DESTROY();
1952 return (EOPNOTSUPP);
1958 static moduledata_t ip6_mroutemod = {
1960 ip6_mroute_modevent,
1964 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);