1/*-
2 * Copyright (C) 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
30 */
31
32/*-
33 * Copyright (c) 1989 Stephen Deering
34 * Copyright (c) 1992, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * Stephen Deering of Stanford University.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
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.
51 *
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
62 * SUCH DAMAGE.
63 *
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
66 */
67
68/*
69 * IP multicast forwarding procedures
70 *
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
77 *
78 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
79 */
80
81#include <sys/cdefs.h>
82__FBSDID("$FreeBSD: head/sys/netinet6/ip6_mroute.c 207369 2010-04-29 11:52:42Z bz $");
83
84#include "opt_inet.h"
85#include "opt_inet6.h"
86
87#include <sys/param.h>
88#include <sys/callout.h>
89#include <sys/errno.h>
90#include <sys/kernel.h>
91#include <sys/lock.h>
92#include <sys/malloc.h>
93#include <sys/mbuf.h>
94#include <sys/module.h>
95#include <sys/domain.h>
96#include <sys/protosw.h>
97#include <sys/signalvar.h>
98#include <sys/socket.h>
99#include <sys/socketvar.h>
100#include <sys/sockio.h>
101#include <sys/sx.h>
102#include <sys/sysctl.h>
103#include <sys/syslog.h>
104#include <sys/systm.h>
105#include <sys/time.h>
106
107#include <net/if.h>
108#include <net/if_types.h>
109#include <net/raw_cb.h>
110#include <net/vnet.h>
111
112#include <netinet/in.h>
113#include <netinet/in_var.h>
114#include <netinet/icmp6.h>
115#include <netinet/ip_encap.h>
116
117#include <netinet/ip6.h>
118#include <netinet6/ip6_var.h>
119#include <netinet6/scope6_var.h>
120#include <netinet6/nd6.h>
121#include <netinet6/ip6_mroute.h>
122#include <netinet6/ip6protosw.h>
123#include <netinet6/pim6.h>
124#include <netinet6/pim6_var.h>
125
126static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
127
128/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
129#define M_HASCL(m) ((m)->m_flags & M_EXT)
130
131static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
132static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
133static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
134static int set_pim6(int *);
135static int socket_send(struct socket *, struct mbuf *,
136 struct sockaddr_in6 *);
137
138extern int in6_mcast_loop;
139extern struct domain inet6domain;
140
141static const struct encaptab *pim6_encap_cookie;
142static const struct ip6protosw in6_pim_protosw = {
143 .pr_type = SOCK_RAW,
144 .pr_domain = &inet6domain,
145 .pr_protocol = IPPROTO_PIM,
146 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
147 .pr_input = pim6_input,
148 .pr_output = rip6_output,
149 .pr_ctloutput = rip6_ctloutput,
150 .pr_usrreqs = &rip6_usrreqs
151};
152static int pim6_encapcheck(const struct mbuf *, int, int, void *);
153
154static VNET_DEFINE(int, ip6_mrouter_ver) = 0;
155#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
156
157SYSCTL_DECL(_net_inet6);
158SYSCTL_DECL(_net_inet6_ip6);
159SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
160
161static struct mrt6stat mrt6stat;
162SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
163 &mrt6stat, mrt6stat,
164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
165
166#define NO_RTE_FOUND 0x1
167#define RTE_FOUND 0x2
168
169static 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(); \
175} while (0)
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)
179
180static struct mf6c *mf6ctable[MF6CTBLSIZ];
181SYSCTL_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)");
185
186static 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(); \
192} while (0)
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)
196
197static u_char n6expire[MF6CTBLSIZ];
198
199static struct mif6 mif6table[MAXMIFS];
200SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
201 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
202 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
203
204static struct mtx mif6_mtx;
205#define MIF6_LOCK() mtx_lock(&mif6_mtx)
206#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
207#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
208#define MIF6_LOCK_INIT() \
209 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
210#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
211
212#ifdef MRT6DEBUG
213static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */
214#define V_mrt6debug VNET(mrt6debug)
215#define DEBUG_MFC 0x02
216#define DEBUG_FORWARD 0x04
217#define DEBUG_EXPIRE 0x08
218#define DEBUG_XMIT 0x10
219#define DEBUG_REG 0x20
220#define DEBUG_PIM 0x40
221#endif
222
223static void expire_upcalls(void *);
224#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
225#define UPCALL_EXPIRE 6 /* number of timeouts */
226
227/*
228 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
229 */
230
231/*
232 * 'Interfaces' associated with decapsulator (so we can tell
233 * packets that went through it from ones that get reflected
234 * by a broken gateway). Different from IPv4 register_if,
235 * these interfaces are linked into the system ifnet list,
236 * because per-interface IPv6 statistics are maintained in
237 * ifp->if_afdata. But it does not have any routes point
238 * to them. I.e., packets can't be sent this way. They
239 * only exist as a placeholder for multicast source
240 * verification.
241 */
242static struct ifnet *multicast_register_if6;
243
244#define ENCAP_HOPS 64
245
246/*
247 * Private variables.
248 */
249static mifi_t nummifs = 0;
250static mifi_t reg_mif_num = (mifi_t)-1;
251
252static struct pim6stat pim6stat;
253SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
254 &pim6stat, pim6stat,
255 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
256
257static VNET_DEFINE(int, pim6);
258#define V_pim6 VNET(pim6)
259
260/*
261 * Hash function for a source, group entry
262 */
263#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
264 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
265 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
266 (g).s6_addr32[2] ^ (g).s6_addr32[3])
267
268/*
269 * Find a route for a given origin IPv6 address and Multicast group address.
270 */
271#define MF6CFIND(o, g, rt) do { \
272 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
273 rt = NULL; \
274 mrt6stat.mrt6s_mfc_lookups++; \
275 while (_rt) { \
276 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
277 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
278 (_rt->mf6c_stall == NULL)) { \
279 rt = _rt; \
280 break; \
281 } \
282 _rt = _rt->mf6c_next; \
283 } \
284 if (rt == NULL) { \
285 mrt6stat.mrt6s_mfc_misses++; \
286 } \
287} while (/*CONSTCOND*/ 0)
288
289/*
290 * Macros to compute elapsed time efficiently
291 * Borrowed from Van Jacobson's scheduling code
292 * XXX: replace with timersub() ?
293 */
294#define TV_DELTA(a, b, delta) do { \
295 int xxs; \
296 \
297 delta = (a).tv_usec - (b).tv_usec; \
298 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
299 switch (xxs) { \
300 case 2: \
301 delta += 1000000; \
302 /* FALLTHROUGH */ \
303 case 1: \
304 delta += 1000000; \
305 break; \
306 default: \
307 delta += (1000000 * xxs); \
308 } \
309 } \
310} while (/*CONSTCOND*/ 0)
311
312/* XXX: replace with timercmp(a, b, <) ? */
313#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
314 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
315
316#ifdef UPCALL_TIMING
317#define UPCALL_MAX 50
318static u_long upcall_data[UPCALL_MAX + 1];
319static void collate();
320#endif /* UPCALL_TIMING */
321
322static int ip6_mrouter_init(struct socket *, int, int);
323static int add_m6fc(struct mf6cctl *);
324static int add_m6if(struct mif6ctl *);
325static int del_m6fc(struct mf6cctl *);
326static int del_m6if(mifi_t *);
327static int del_m6if_locked(mifi_t *);
328static int get_mif6_cnt(struct sioc_mif_req6 *);
329static int get_sg_cnt(struct sioc_sg_req6 *);
330
331static struct callout expire_upcalls_ch;
332
333int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
334int X_ip6_mrouter_done(void);
335int X_ip6_mrouter_set(struct socket *, struct sockopt *);
336int X_ip6_mrouter_get(struct socket *, struct sockopt *);
337int X_mrt6_ioctl(u_long, caddr_t);
338
339/*
340 * Handle MRT setsockopt commands to modify the multicast routing tables.
341 */
342int
343X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
344{
345 int error = 0;
346 int optval;
347 struct mif6ctl mifc;
348 struct mf6cctl mfcc;
349 mifi_t mifi;
350
351 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
352 return (EACCES);
353
354 switch (sopt->sopt_name) {
355 case MRT6_INIT:
356#ifdef MRT6_OINIT
357 case MRT6_OINIT:
358#endif
359 error = sooptcopyin(sopt, &optval, sizeof(optval),
360 sizeof(optval));
361 if (error)
362 break;
363 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
364 break;
365 case MRT6_DONE:
366 error = X_ip6_mrouter_done();
367 break;
368 case MRT6_ADD_MIF:
369 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
370 if (error)
371 break;
372 error = add_m6if(&mifc);
373 break;
374 case MRT6_ADD_MFC:
375 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
376 if (error)
377 break;
378 error = add_m6fc(&mfcc);
379 break;
380 case MRT6_DEL_MFC:
381 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
382 if (error)
383 break;
384 error = del_m6fc(&mfcc);
385 break;
386 case MRT6_DEL_MIF:
387 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
388 if (error)
389 break;
390 error = del_m6if(&mifi);
391 break;
392 case MRT6_PIM:
393 error = sooptcopyin(sopt, &optval, sizeof(optval),
394 sizeof(optval));
395 if (error)
396 break;
397 error = set_pim6(&optval);
398 break;
399 default:
400 error = EOPNOTSUPP;
401 break;
402 }
403
404 return (error);
405}
406
407/*
408 * Handle MRT getsockopt commands
409 */
410int
411X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
412{
413 int error = 0;
414
415 if (so != V_ip6_mrouter)
416 return (EACCES);
417
418 switch (sopt->sopt_name) {
419 case MRT6_PIM:
420 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
421 break;
422 }
423 return (error);
424}
425
426/*
427 * Handle ioctl commands to obtain information from the cache
428 */
429int
430X_mrt6_ioctl(u_long cmd, caddr_t data)
431{
432 int ret;
433
434 ret = EINVAL;
435
436 switch (cmd) {
437 case SIOCGETSGCNT_IN6:
438 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
439 break;
440
441 case SIOCGETMIFCNT_IN6:
442 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
443 break;
444
445 default:
446 break;
447 }
448
449 return (ret);
450}
451
452/*
453 * returns the packet, byte, rpf-failure count for the source group provided
454 */
455static int
456get_sg_cnt(struct sioc_sg_req6 *req)
457{
458 struct mf6c *rt;
459 int ret;
460
461 ret = 0;
462
463 MFC6_LOCK();
464
465 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
466 if (rt == NULL) {
467 ret = ESRCH;
468 } else {
469 req->pktcnt = rt->mf6c_pkt_cnt;
470 req->bytecnt = rt->mf6c_byte_cnt;
471 req->wrong_if = rt->mf6c_wrong_if;
472 }
473
474 MFC6_UNLOCK();
475
476 return (ret);
477}
478
479/*
480 * returns the input and output packet and byte counts on the mif provided
481 */
482static int
483get_mif6_cnt(struct sioc_mif_req6 *req)
484{
485 mifi_t mifi;
486 int ret;
487
488 ret = 0;
489 mifi = req->mifi;
490
491 MIF6_LOCK();
492
493 if (mifi >= nummifs) {
494 ret = EINVAL;
495 } else {
496 req->icount = mif6table[mifi].m6_pkt_in;
497 req->ocount = mif6table[mifi].m6_pkt_out;
498 req->ibytes = mif6table[mifi].m6_bytes_in;
499 req->obytes = mif6table[mifi].m6_bytes_out;
500 }
501
502 MIF6_UNLOCK();
503
504 return (ret);
505}
506
507static int
508set_pim6(int *i)
509{
510 if ((*i != 1) && (*i != 0))
511 return (EINVAL);
512
513 V_pim6 = *i;
514
515 return (0);
516}
517
518/*
519 * Enable multicast routing
520 */
521static int
522ip6_mrouter_init(struct socket *so, int v, int cmd)
523{
524
525#ifdef MRT6DEBUG
526 if (V_mrt6debug)
527 log(LOG_DEBUG,
528 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
529 so->so_type, so->so_proto->pr_protocol);
530#endif
531
532 if (so->so_type != SOCK_RAW ||
533 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
534 return (EOPNOTSUPP);
535
536 if (v != 1)
537 return (ENOPROTOOPT);
538
539 MROUTER6_LOCK();
540
541 if (V_ip6_mrouter != NULL) {
542 MROUTER6_UNLOCK();
543 return (EADDRINUSE);
544 }
545
546 V_ip6_mrouter = so;
547 V_ip6_mrouter_ver = cmd;
548
549 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
550 bzero((caddr_t)n6expire, sizeof(n6expire));
551
552 V_pim6 = 0;/* used for stubbing out/in pim stuff */
553
554 callout_init(&expire_upcalls_ch, 0);
555 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
556 expire_upcalls, NULL);
557
558 MROUTER6_UNLOCK();
559
560#ifdef MRT6DEBUG
561 if (V_mrt6debug)
562 log(LOG_DEBUG, "ip6_mrouter_init\n");
563#endif
564
565 return (0);
566}
567
568/*
569 * Disable IPv6 multicast forwarding.
570 */
571int
572X_ip6_mrouter_done(void)
573{
574 mifi_t mifi;
575 int i;
576 struct mf6c *rt;
577 struct rtdetq *rte;
578
579 MROUTER6_LOCK();
580
581 if (V_ip6_mrouter == NULL) {
582 MROUTER6_UNLOCK();
583 return (EINVAL);
584 }
585
586 /*
587 * For each phyint in use, disable promiscuous reception of all IPv6
588 * multicasts.
589 */
590 for (mifi = 0; mifi < nummifs; mifi++) {
591 if (mif6table[mifi].m6_ifp &&
592 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
593 if_allmulti(mif6table[mifi].m6_ifp, 0);
594 }
595 }
596 bzero((caddr_t)mif6table, sizeof(mif6table));
597 nummifs = 0;
598
599 V_pim6 = 0; /* used to stub out/in pim specific code */
600
601 callout_stop(&expire_upcalls_ch);
602
603 /*
604 * Free all multicast forwarding cache entries.
605 */
606 MFC6_LOCK();
607 for (i = 0; i < MF6CTBLSIZ; i++) {
608 rt = mf6ctable[i];
609 while (rt) {
610 struct mf6c *frt;
611
612 for (rte = rt->mf6c_stall; rte != NULL; ) {
613 struct rtdetq *n = rte->next;
614
615 m_free(rte->m);
616 free(rte, M_MRTABLE6);
617 rte = n;
618 }
619 frt = rt;
620 rt = rt->mf6c_next;
621 free(frt, M_MRTABLE6);
622 }
623 }
624 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
625 MFC6_UNLOCK();
626
627 /*
628 * Reset register interface
629 */
630 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
631 if_detach(multicast_register_if6);
632 if_free(multicast_register_if6);
633 reg_mif_num = (mifi_t)-1;
634 multicast_register_if6 = NULL;
635 }
636
637 V_ip6_mrouter = NULL;
638 V_ip6_mrouter_ver = 0;
639
640 MROUTER6_UNLOCK();
641
642#ifdef MRT6DEBUG
643 if (V_mrt6debug)
644 log(LOG_DEBUG, "ip6_mrouter_done\n");
645#endif
646
647 return (0);
648}
649
650static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
651
652/*
653 * Add a mif to the mif table
654 */
655static int
656add_m6if(struct mif6ctl *mifcp)
657{
658 struct mif6 *mifp;
659 struct ifnet *ifp;
660 int error;
661
662 MIF6_LOCK();
663
664 if (mifcp->mif6c_mifi >= MAXMIFS) {
665 MIF6_UNLOCK();
666 return (EINVAL);
667 }
668 mifp = mif6table + mifcp->mif6c_mifi;
669 if (mifp->m6_ifp != NULL) {
670 MIF6_UNLOCK();
671 return (EADDRINUSE); /* XXX: is it appropriate? */
672 }
673 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
674 MIF6_UNLOCK();
675 return (ENXIO);
676 }
677
678 ifp = ifnet_byindex(mifcp->mif6c_pifi);
679
680 if (mifcp->mif6c_flags & MIFF_REGISTER) {
681 if (reg_mif_num == (mifi_t)-1) {
682 ifp = if_alloc(IFT_OTHER);
683
684 if_initname(ifp, "register_mif", 0);
685 ifp->if_flags |= IFF_LOOPBACK;
686 if_attach(ifp);
687 multicast_register_if6 = ifp;
688 reg_mif_num = mifcp->mif6c_mifi;
689 /*
690 * it is impossible to guess the ifindex of the
691 * register interface. So mif6c_pifi is automatically
692 * calculated.
693 */
694 mifcp->mif6c_pifi = ifp->if_index;
695 } else {
696 ifp = multicast_register_if6;
697 }
698 } else {
699 /* Make sure the interface supports multicast */
700 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
701 MIF6_UNLOCK();
702 return (EOPNOTSUPP);
703 }
704
705 error = if_allmulti(ifp, 1);
706 if (error) {
707 MIF6_UNLOCK();
708 return (error);
709 }
710 }
711
712 mifp->m6_flags = mifcp->mif6c_flags;
713 mifp->m6_ifp = ifp;
714
715 /* initialize per mif pkt counters */
716 mifp->m6_pkt_in = 0;
717 mifp->m6_pkt_out = 0;
718 mifp->m6_bytes_in = 0;
719 mifp->m6_bytes_out = 0;
720 bzero(&mifp->m6_route, sizeof(mifp->m6_route));
721
722 /* Adjust nummifs up if the mifi is higher than nummifs */
723 if (nummifs <= mifcp->mif6c_mifi)
724 nummifs = mifcp->mif6c_mifi + 1;
725
726 MIF6_UNLOCK();
727
728#ifdef MRT6DEBUG
729 if (V_mrt6debug)
730 log(LOG_DEBUG,
731 "add_mif #%d, phyint %s\n",
732 mifcp->mif6c_mifi,
733 ifp->if_xname);
734#endif
735
736 return (0);
737}
738
739/*
740 * Delete a mif from the mif table
741 */
742static int
743del_m6if_locked(mifi_t *mifip)
744{
745 struct mif6 *mifp = mif6table + *mifip;
746 mifi_t mifi;
747 struct ifnet *ifp;
748
749 MIF6_LOCK_ASSERT();
750
751 if (*mifip >= nummifs)
752 return (EINVAL);
753 if (mifp->m6_ifp == NULL)
754 return (EINVAL);
755
756 if (!(mifp->m6_flags & MIFF_REGISTER)) {
757 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
758 ifp = mifp->m6_ifp;
759 if_allmulti(ifp, 0);
760 } else {
761 if (reg_mif_num != (mifi_t)-1 &&
762 multicast_register_if6 != NULL) {
763 if_detach(multicast_register_if6);
764 if_free(multicast_register_if6);
765 reg_mif_num = (mifi_t)-1;
766 multicast_register_if6 = NULL;
767 }
768 }
769
770 bzero((caddr_t)mifp, sizeof(*mifp));
771
772 /* Adjust nummifs down */
773 for (mifi = nummifs; mifi > 0; mifi--)
774 if (mif6table[mifi - 1].m6_ifp)
775 break;
776 nummifs = mifi;
777
778#ifdef MRT6DEBUG
779 if (V_mrt6debug)
780 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
781#endif
782
783 return (0);
784}
785
786static int
787del_m6if(mifi_t *mifip)
788{
789 int cc;
790
791 MIF6_LOCK();
792 cc = del_m6if_locked(mifip);
793 MIF6_UNLOCK();
794
795 return (cc);
796}
797
798/*
799 * Add an mfc entry
800 */
801static int
802add_m6fc(struct mf6cctl *mfccp)
803{
804 struct mf6c *rt;
805 u_long hash;
806 struct rtdetq *rte;
807 u_short nstl;
808 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
809
810 MFC6_LOCK();
811
812 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
813 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
814
815 /* If an entry already exists, just update the fields */
816 if (rt) {
817#ifdef MRT6DEBUG
818 if (V_mrt6debug & DEBUG_MFC) {
819 log(LOG_DEBUG,
820 "add_m6fc no upcall h %d o %s g %s p %x\n",
821 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
822 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
823 mfccp->mf6cc_parent);
824 }
825#endif
826
827 rt->mf6c_parent = mfccp->mf6cc_parent;
828 rt->mf6c_ifset = mfccp->mf6cc_ifset;
829
830 MFC6_UNLOCK();
831 return (0);
832 }
833
834 /*
835 * Find the entry for which the upcall was made and update
836 */
837 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
838 mfccp->mf6cc_mcastgrp.sin6_addr);
839 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
840 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
841 &mfccp->mf6cc_origin.sin6_addr) &&
842 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
843 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
844 (rt->mf6c_stall != NULL)) {
845
846 if (nstl++)
847 log(LOG_ERR,
848 "add_m6fc: %s o %s g %s p %x dbx %p\n",
849 "multiple kernel entries",
850 ip6_sprintf(ip6bufo,
851 &mfccp->mf6cc_origin.sin6_addr),
852 ip6_sprintf(ip6bufg,
853 &mfccp->mf6cc_mcastgrp.sin6_addr),
854 mfccp->mf6cc_parent, rt->mf6c_stall);
855
856#ifdef MRT6DEBUG
857 if (V_mrt6debug & DEBUG_MFC)
858 log(LOG_DEBUG,
859 "add_m6fc o %s g %s p %x dbg %x\n",
860 ip6_sprintf(ip6bufo,
861 &mfccp->mf6cc_origin.sin6_addr),
862 ip6_sprintf(ip6bufg,
863 &mfccp->mf6cc_mcastgrp.sin6_addr),
864 mfccp->mf6cc_parent, rt->mf6c_stall);
865#endif
866
867 rt->mf6c_origin = mfccp->mf6cc_origin;
868 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
869 rt->mf6c_parent = mfccp->mf6cc_parent;
870 rt->mf6c_ifset = mfccp->mf6cc_ifset;
871 /* initialize pkt counters per src-grp */
872 rt->mf6c_pkt_cnt = 0;
873 rt->mf6c_byte_cnt = 0;
874 rt->mf6c_wrong_if = 0;
875
876 rt->mf6c_expire = 0; /* Don't clean this guy up */
877 n6expire[hash]--;
878
879 /* free packets Qed at the end of this entry */
880 for (rte = rt->mf6c_stall; rte != NULL; ) {
881 struct rtdetq *n = rte->next;
882 ip6_mdq(rte->m, rte->ifp, rt);
883 m_freem(rte->m);
884#ifdef UPCALL_TIMING
885 collate(&(rte->t));
886#endif /* UPCALL_TIMING */
887 free(rte, M_MRTABLE6);
888 rte = n;
889 }
890 rt->mf6c_stall = NULL;
891 }
892 }
893
894 /*
895 * It is possible that an entry is being inserted without an upcall
896 */
897 if (nstl == 0) {
898#ifdef MRT6DEBUG
899 if (V_mrt6debug & DEBUG_MFC)
900 log(LOG_DEBUG,
901 "add_mfc no upcall h %d o %s g %s p %x\n",
902 hash,
903 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
904 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
905 mfccp->mf6cc_parent);
906#endif
907
908 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
909
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)) {
914
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;
923
924 if (rt->mf6c_expire)
925 n6expire[hash]--;
926 rt->mf6c_expire = 0;
927 }
928 }
929 if (rt == NULL) {
930 /* no upcall, so make a new entry */
931 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
932 M_NOWAIT);
933 if (rt == NULL) {
934 MFC6_UNLOCK();
935 return (ENOBUFS);
936 }
937
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;
947 rt->mf6c_expire = 0;
948 rt->mf6c_stall = NULL;
949
950 /* link into table */
951 rt->mf6c_next = mf6ctable[hash];
952 mf6ctable[hash] = rt;
953 }
954 }
955
956 MFC6_UNLOCK();
957 return (0);
958}
959
960#ifdef UPCALL_TIMING
961/*
962 * collect delay statistics on the upcalls
963 */
964static void
965collate(struct timeval *t)
966{
967 u_long d;
968 struct timeval tp;
969 u_long delta;
970
971 GET_TIME(tp);
972
973 if (TV_LT(*t, tp))
974 {
975 TV_DELTA(tp, *t, delta);
976
977 d = delta >> 10;
978 if (d > UPCALL_MAX)
979 d = UPCALL_MAX;
980
981 ++upcall_data[d];
982 }
983}
984#endif /* UPCALL_TIMING */
985
986/*
987 * Delete an mfc entry
988 */
989static int
990del_m6fc(struct mf6cctl *mfccp)
991{
992 struct sockaddr_in6 origin;
993 struct sockaddr_in6 mcastgrp;
994 struct mf6c *rt;
995 struct mf6c **nptr;
996 u_long hash;
997
998 origin = mfccp->mf6cc_origin;
999 mcastgrp = mfccp->mf6cc_mcastgrp;
1000 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1001
1002#ifdef MRT6DEBUG
1003 if (V_mrt6debug & DEBUG_MFC) {
1004 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1005 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
1006 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1007 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1008 }
1009#endif
1010
1011 MFC6_LOCK();
1012
1013 nptr = &mf6ctable[hash];
1014 while ((rt = *nptr) != NULL) {
1015 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1016 &rt->mf6c_origin.sin6_addr) &&
1017 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1018 &rt->mf6c_mcastgrp.sin6_addr) &&
1019 rt->mf6c_stall == NULL)
1020 break;
1021
1022 nptr = &rt->mf6c_next;
1023 }
1024 if (rt == NULL) {
1025 MFC6_UNLOCK();
1026 return (EADDRNOTAVAIL);
1027 }
1028
1029 *nptr = rt->mf6c_next;
1030 free(rt, M_MRTABLE6);
1031
1032 MFC6_UNLOCK();
1033
1034 return (0);
1035}
1036
1037static int
1038socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1039{
1040
1041 if (s) {
1042 if (sbappendaddr(&s->so_rcv,
1043 (struct sockaddr *)src,
1044 mm, (struct mbuf *)0) != 0) {
1045 sorwakeup(s);
1046 return (0);
1047 }
1048 }
1049 m_freem(mm);
1050 return (-1);
1051}
1052
1053/*
1054 * IPv6 multicast forwarding function. This function assumes that the packet
1055 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1056 * pointed to by "ifp", and the packet is to be relayed to other networks
1057 * that have members of the packet's destination IPv6 multicast group.
1058 *
1059 * The packet is returned unscathed to the caller, unless it is
1060 * erroneous, in which case a non-zero return value tells the caller to
1061 * discard it.
1062 *
1063 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1064 * this function is called in the originating context (i.e., not when
1065 * forwarding a packet from other node). ip6_output(), which is currently the
1066 * only function that calls this function is called in the originating context,
1067 * explicitly ensures this condition. It is caller's responsibility to ensure
1068 * that if this function is called from somewhere else in the originating
1069 * context in the future.
1070 */
1071int
1072X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1073{
1074 struct mf6c *rt;
1075 struct mif6 *mifp;
1076 struct mbuf *mm;
1077 mifi_t mifi;
1078 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1079
1080#ifdef MRT6DEBUG
1081 if (V_mrt6debug & DEBUG_FORWARD)
1082 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
1083 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1085 ifp->if_index);
1086#endif
1087
1088 /*
1089 * Don't forward a packet with Hop limit of zero or one,
1090 * or a packet destined to a local-only group.
1091 */
1092 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1093 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1094 return (0);
1095 ip6->ip6_hlim--;
1096
1097 /*
1098 * Source address check: do not forward packets with unspecified
1099 * source. It was discussed in July 2000, on ipngwg mailing list.
1100 * This is rather more serious than unicast cases, because some
1101 * MLD packets can be sent with the unspecified source address
1102 * (although such packets must normally set 1 to the hop limit field).
1103 */
1104 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1105 V_ip6stat.ip6s_cantforward++;
1106 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
1107 V_ip6_log_time = time_second;
1108 log(LOG_DEBUG,
1109 "cannot forward "
1110 "from %s to %s nxt %d received on %s\n",
1111 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1113 ip6->ip6_nxt,
1114 if_name(m->m_pkthdr.rcvif));
1115 }
1116 return (0);
1117 }
1118
1119 MFC6_LOCK();
1120
1121 /*
1122 * Determine forwarding mifs from the forwarding cache table
1123 */
1124 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1125
1126 /* Entry exists, so forward if necessary */
1127 if (rt) {
1128 MFC6_UNLOCK();
1129 return (ip6_mdq(m, ifp, rt));
1130 } else {
1131 /*
1132 * If we don't have a route for packet's origin,
1133 * Make a copy of the packet &
1134 * send message to routing daemon
1135 */
1136
1137 struct mbuf *mb0;
1138 struct rtdetq *rte;
1139 u_long hash;
1140/* int i, npkts;*/
1141#ifdef UPCALL_TIMING
1142 struct timeval tp;
1143
1144 GET_TIME(tp);
1145#endif /* UPCALL_TIMING */
1146
1147 mrt6stat.mrt6s_no_route++;
1148#ifdef MRT6DEBUG
1149 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1150 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1151 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1152 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1153#endif
1154
1155 /*
1156 * Allocate mbufs early so that we don't do extra work if we
1157 * are just going to fail anyway.
1158 */
1159 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
1160 M_NOWAIT);
1161 if (rte == NULL) {
1162 MFC6_UNLOCK();
1163 return (ENOBUFS);
1164 }
1165 mb0 = m_copy(m, 0, M_COPYALL);
1166 /*
1167 * Pullup packet header if needed before storing it,
1168 * as other references may modify it in the meantime.
1169 */
1170 if (mb0 &&
1171 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1172 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1173 if (mb0 == NULL) {
1174 free(rte, M_MRTABLE6);
1175 MFC6_UNLOCK();
1176 return (ENOBUFS);
1177 }
1178
1179 /* is there an upcall waiting for this packet? */
1180 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1181 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1182 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1183 &rt->mf6c_origin.sin6_addr) &&
1184 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1185 &rt->mf6c_mcastgrp.sin6_addr) &&
1186 (rt->mf6c_stall != NULL))
1187 break;
1188 }
1189
1190 if (rt == NULL) {
1191 struct mrt6msg *im;
1192#ifdef MRT6_OINIT
1193 struct omrt6msg *oim;
1194#endif
1195
1196 /* no upcall, so make a new entry */
1197 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
1198 M_NOWAIT);
1199 if (rt == NULL) {
1200 free(rte, M_MRTABLE6);
1201 m_freem(mb0);
1202 MFC6_UNLOCK();
1203 return (ENOBUFS);
1204 }
1205 /*
1206 * Make a copy of the header to send to the user
1207 * level process
1208 */
1209 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1210
1211 if (mm == NULL) {
1212 free(rte, M_MRTABLE6);
1213 m_freem(mb0);
1214 free(rt, M_MRTABLE6);
1215 MFC6_UNLOCK();
1216 return (ENOBUFS);
1217 }
1218
1219 /*
1220 * Send message to routing daemon
1221 */
1222 sin6.sin6_addr = ip6->ip6_src;
1223
1224 im = NULL;
1225#ifdef MRT6_OINIT
1226 oim = NULL;
1227#endif
1228 switch (V_ip6_mrouter_ver) {
1229#ifdef MRT6_OINIT
1230 case MRT6_OINIT:
1231 oim = mtod(mm, struct omrt6msg *);
1232 oim->im6_msgtype = MRT6MSG_NOCACHE;
1233 oim->im6_mbz = 0;
1234 break;
1235#endif
1236 case MRT6_INIT:
1237 im = mtod(mm, struct mrt6msg *);
1238 im->im6_msgtype = MRT6MSG_NOCACHE;
1239 im->im6_mbz = 0;
1240 break;
1241 default:
1242 free(rte, M_MRTABLE6);
1243 m_freem(mb0);
1244 free(rt, M_MRTABLE6);
1245 MFC6_UNLOCK();
1246 return (EINVAL);
1247 }
1248
1249#ifdef MRT6DEBUG
1250 if (V_mrt6debug & DEBUG_FORWARD)
1251 log(LOG_DEBUG,
1252 "getting the iif info in the kernel\n");
1253#endif
1254
1255 for (mifp = mif6table, mifi = 0;
1256 mifi < nummifs && mifp->m6_ifp != ifp;
1257 mifp++, mifi++)
1258 ;
1259
1260 switch (V_ip6_mrouter_ver) {
1261#ifdef MRT6_OINIT
1262 case MRT6_OINIT:
1263 oim->im6_mif = mifi;
1264 break;
1265#endif
1266 case MRT6_INIT:
1267 im->im6_mif = mifi;
1268 break;
1269 }
1270
1271 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1272 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1273 "socket queue full\n");
1274 mrt6stat.mrt6s_upq_sockfull++;
1275 free(rte, M_MRTABLE6);
1276 m_freem(mb0);
1277 free(rt, M_MRTABLE6);
1278 MFC6_UNLOCK();
1279 return (ENOBUFS);
1280 }
1281
1282 mrt6stat.mrt6s_upcalls++;
1283
1284 /* insert new entry at head of hash chain */
1285 bzero(rt, sizeof(*rt));
1286 rt->mf6c_origin.sin6_family = AF_INET6;
1287 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1288 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1289 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1290 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1291 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1292 rt->mf6c_expire = UPCALL_EXPIRE;
1293 n6expire[hash]++;
1294 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1295
1296 /* link into table */
1297 rt->mf6c_next = mf6ctable[hash];
1298 mf6ctable[hash] = rt;
1299 /* Add this entry to the end of the queue */
1300 rt->mf6c_stall = rte;
1301 } else {
1302 /* determine if q has overflowed */
1303 struct rtdetq **p;
1304 int npkts = 0;
1305
1306 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1307 if (++npkts > MAX_UPQ6) {
1308 mrt6stat.mrt6s_upq_ovflw++;
1309 free(rte, M_MRTABLE6);
1310 m_freem(mb0);
1311 MFC6_UNLOCK();
1312 return (0);
1313 }
1314
1315 /* Add this entry to the end of the queue */
1316 *p = rte;
1317 }
1318
1319 rte->next = NULL;
1320 rte->m = mb0;
1321 rte->ifp = ifp;
1322#ifdef UPCALL_TIMING
1323 rte->t = tp;
1324#endif /* UPCALL_TIMING */
1325
1326 MFC6_UNLOCK();
1327
1328 return (0);
1329 }
1330}
1331
1332/*
1333 * Clean up cache entries if upcalls are not serviced
1334 * Call from the Slow Timeout mechanism, every half second.
1335 */
1336static void
1337expire_upcalls(void *unused)
1338{
1339 struct rtdetq *rte;
1340 struct mf6c *mfc, **nptr;
1341 int i;
1342
1343 MFC6_LOCK();
1344 for (i = 0; i < MF6CTBLSIZ; i++) {
1345 if (n6expire[i] == 0)
1346 continue;
1347 nptr = &mf6ctable[i];
1348 while ((mfc = *nptr) != NULL) {
1349 rte = mfc->mf6c_stall;
1350 /*
1351 * Skip real cache entries
1352 * Make sure it wasn't marked to not expire (shouldn't happen)
1353 * If it expires now
1354 */
1355 if (rte != NULL &&
1356 mfc->mf6c_expire != 0 &&
1357 --mfc->mf6c_expire == 0) {
1358#ifdef MRT6DEBUG
1359 if (V_mrt6debug & DEBUG_EXPIRE) {
1360 char ip6bufo[INET6_ADDRSTRLEN];
1361 char ip6bufg[INET6_ADDRSTRLEN];
1362 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1363 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1364 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1365 }
1366#endif
1367 /*
1368 * drop all the packets
1369 * free the mbuf with the pkt, if, timing info
1370 */
1371 do {
1372 struct rtdetq *n = rte->next;
1373 m_freem(rte->m);
1374 free(rte, M_MRTABLE6);
1375 rte = n;
1376 } while (rte != NULL);
1377 mrt6stat.mrt6s_cache_cleanups++;
1378 n6expire[i]--;
1379
1380 *nptr = mfc->mf6c_next;
1381 free(mfc, M_MRTABLE6);
1382 } else {
1383 nptr = &mfc->mf6c_next;
1384 }
1385 }
1386 }
1387 MFC6_UNLOCK();
1388 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1389 expire_upcalls, NULL);
1390}
1391
1392/*
1393 * Packet forwarding routine once entry in the cache is made
1394 */
1395static int
1396ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1397{
1398 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1399 mifi_t mifi, iif;
1400 struct mif6 *mifp;
1401 int plen = m->m_pkthdr.len;
1402 struct in6_addr src0, dst0; /* copies for local work */
1403 u_int32_t iszone, idzone, oszone, odzone;
1404 int error = 0;
1405
1406/*
1407 * Macro to send packet on mif. Since RSVP packets don't get counted on
1408 * input, they shouldn't get counted on output, so statistics keeping is
1409 * separate.
1410 */
1411
1412#define MC6_SEND(ip6, mifp, m) do { \
1413 if ((mifp)->m6_flags & MIFF_REGISTER) \
1414 register_send((ip6), (mifp), (m)); \
1415 else \
1416 phyint_send((ip6), (mifp), (m)); \
1417} while (/*CONSTCOND*/ 0)
1418
1419 /*
1420 * Don't forward if it didn't arrive from the parent mif
1421 * for its origin.
1422 */
1423 mifi = rt->mf6c_parent;
1424 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1425 /* came in the wrong interface */
1426#ifdef MRT6DEBUG
1427 if (V_mrt6debug & DEBUG_FORWARD)
1428 log(LOG_DEBUG,
1429 "wrong if: ifid %d mifi %d mififid %x\n",
1430 ifp->if_index, mifi,
1431 mif6table[mifi].m6_ifp->if_index);
1432#endif
1433 mrt6stat.mrt6s_wrong_if++;
1434 rt->mf6c_wrong_if++;
1435 /*
1436 * If we are doing PIM processing, and we are forwarding
1437 * packets on this interface, send a message to the
1438 * routing daemon.
1439 */
1440 /* have to make sure this is a valid mif */
1441 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1442 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1443 /*
1444 * Check the M_LOOP flag to avoid an
1445 * unnecessary PIM assert.
1446 * XXX: M_LOOP is an ad-hoc hack...
1447 */
1448 static struct sockaddr_in6 sin6 =
1449 { sizeof(sin6), AF_INET6 };
1450
1451 struct mbuf *mm;
1452 struct mrt6msg *im;
1453#ifdef MRT6_OINIT
1454 struct omrt6msg *oim;
1455#endif
1456
1457 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1458 if (mm &&
1459 (M_HASCL(mm) ||
1460 mm->m_len < sizeof(struct ip6_hdr)))
1461 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1462 if (mm == NULL)
1463 return (ENOBUFS);
1464
1465#ifdef MRT6_OINIT
1466 oim = NULL;
1467#endif
1468 im = NULL;
1469 switch (V_ip6_mrouter_ver) {
1470#ifdef MRT6_OINIT
1471 case MRT6_OINIT:
1472 oim = mtod(mm, struct omrt6msg *);
1473 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1474 oim->im6_mbz = 0;
1475 break;
1476#endif
1477 case MRT6_INIT:
1478 im = mtod(mm, struct mrt6msg *);
1479 im->im6_msgtype = MRT6MSG_WRONGMIF;
1480 im->im6_mbz = 0;
1481 break;
1482 default:
1483 m_freem(mm);
1484 return (EINVAL);
1485 }
1486
1487 for (mifp = mif6table, iif = 0;
1488 iif < nummifs && mifp &&
1489 mifp->m6_ifp != ifp;
1490 mifp++, iif++)
1491 ;
1492
1493 switch (V_ip6_mrouter_ver) {
1494#ifdef MRT6_OINIT
1495 case MRT6_OINIT:
1496 oim->im6_mif = iif;
1497 sin6.sin6_addr = oim->im6_src;
1498 break;
1499#endif
1500 case MRT6_INIT:
1501 im->im6_mif = iif;
1502 sin6.sin6_addr = im->im6_src;
1503 break;
1504 }
1505
1506 mrt6stat.mrt6s_upcalls++;
1507
1508 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1509#ifdef MRT6DEBUG
1510 if (V_mrt6debug)
1511 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1512#endif
1513 ++mrt6stat.mrt6s_upq_sockfull;
1514 return (ENOBUFS);
1515 } /* if socket Q full */
1516 } /* if PIM */
1517 return (0);
1518 } /* if wrong iif */
1519
1520 /* If I sourced this packet, it counts as output, else it was input. */
1521 if (m->m_pkthdr.rcvif == NULL) {
1522 /* XXX: is rcvif really NULL when output?? */
1523 mif6table[mifi].m6_pkt_out++;
1524 mif6table[mifi].m6_bytes_out += plen;
1525 } else {
1526 mif6table[mifi].m6_pkt_in++;
1527 mif6table[mifi].m6_bytes_in += plen;
1528 }
1529 rt->mf6c_pkt_cnt++;
1530 rt->mf6c_byte_cnt += plen;
1531
1532 /*
1533 * For each mif, forward a copy of the packet if there are group
1534 * members downstream on the interface.
1535 */
1536 src0 = ip6->ip6_src;
1537 dst0 = ip6->ip6_dst;
1538 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1539 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1540 V_ip6stat.ip6s_badscope++;
1541 return (error);
1542 }
1543 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1544 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1545 /*
1546 * check if the outgoing packet is going to break
1547 * a scope boundary.
1548 * XXX For packets through PIM register tunnel
1549 * interface, we believe a routing daemon.
1550 */
1551 if (!(mif6table[rt->mf6c_parent].m6_flags &
1552 MIFF_REGISTER) &&
1553 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1554 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1555 &oszone) ||
1556 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1557 &odzone) ||
1558 iszone != oszone ||
1559 idzone != odzone) {
1560 V_ip6stat.ip6s_badscope++;
1561 continue;
1562 }
1563 }
1564
1565 mifp->m6_pkt_out++;
1566 mifp->m6_bytes_out += plen;
1567 MC6_SEND(ip6, mifp, m);
1568 }
1569 }
1570 return (0);
1571}
1572
1573static void
1574phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1575{
1576 struct mbuf *mb_copy;
1577 struct ifnet *ifp = mifp->m6_ifp;
1578 int error = 0;
1579 struct sockaddr_in6 *dst6;
1580 u_long linkmtu;
1581
1582 dst6 = &mifp->m6_route.ro_dst;
1583
1584 /*
1585 * Make a new reference to the packet; make sure that
1586 * the IPv6 header is actually copied, not just referenced,
1587 * so that ip6_output() only scribbles on the copy.
1588 */
1589 mb_copy = m_copy(m, 0, M_COPYALL);
1590 if (mb_copy &&
1591 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1592 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1593 if (mb_copy == NULL) {
1594 return;
1595 }
1596 /* set MCAST flag to the outgoing packet */
1597 mb_copy->m_flags |= M_MCAST;
1598
1599 /*
1600 * If we sourced the packet, call ip6_output since we may devide
1601 * the packet into fragments when the packet is too big for the
1602 * outgoing interface.
1603 * Otherwise, we can simply send the packet to the interface
1604 * sending queue.
1605 */
1606 if (m->m_pkthdr.rcvif == NULL) {
1607 struct ip6_moptions im6o;
1608
1609 im6o.im6o_multicast_ifp = ifp;
1610 /* XXX: ip6_output will override ip6->ip6_hlim */
1611 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1612 im6o.im6o_multicast_loop = 1;
1613 error = ip6_output(mb_copy, NULL, &mifp->m6_route,
1614 IPV6_FORWARDING, &im6o, NULL, NULL);
1615
1616#ifdef MRT6DEBUG
1617 if (V_mrt6debug & DEBUG_XMIT)
1618 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1619 mifp - mif6table, error);
1620#endif
1621 return;
1622 }
1623
1624 /*
1625 * If configured to loop back multicasts by default,
1626 * loop back a copy now.
1627 */
1628 if (in6_mcast_loop) {
1629 dst6->sin6_len = sizeof(struct sockaddr_in6);
1630 dst6->sin6_family = AF_INET6;
1631 dst6->sin6_addr = ip6->ip6_dst;
1632 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst);
1633 }
1634
1635 /*
1636 * Put the packet into the sending queue of the outgoing interface
1637 * if it would fit in the MTU of the interface.
1638 */
1639 linkmtu = IN6_LINKMTU(ifp);
1640 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1641 dst6->sin6_len = sizeof(struct sockaddr_in6);
1642 dst6->sin6_family = AF_INET6;
1643 dst6->sin6_addr = ip6->ip6_dst;
1644 /*
1645 * We just call if_output instead of nd6_output here, since
1646 * we need no ND for a multicast forwarded packet...right?
1647 */
1648 error = (*ifp->if_output)(ifp, mb_copy,
1649 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL);
1650#ifdef MRT6DEBUG
1651 if (V_mrt6debug & DEBUG_XMIT)
1652 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1653 mifp - mif6table, error);
1654#endif
1655 } else {
1656 /*
1657 * pMTU discovery is intentionally disabled by default, since
1658 * various router may notify pMTU in multicast, which can be
1659 * a DDoS to a router
1660 */
1661 if (V_ip6_mcast_pmtu)
1662 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1663 else {
1664#ifdef MRT6DEBUG
1665 if (V_mrt6debug & DEBUG_XMIT) {
1666 char ip6bufs[INET6_ADDRSTRLEN];
1667 char ip6bufd[INET6_ADDRSTRLEN];
1668 log(LOG_DEBUG,
1669 "phyint_send: packet too big on %s o %s "
1670 "g %s size %d(discarded)\n",
1671 if_name(ifp),
1672 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1673 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1674 mb_copy->m_pkthdr.len);
1675 }
1676#endif /* MRT6DEBUG */
1677 m_freem(mb_copy); /* simply discard the packet */
1678 }
1679 }
1680}
1681
1682static int
1683register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1684{
1685 struct mbuf *mm;
1686 int i, len = m->m_pkthdr.len;
1687 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1688 struct mrt6msg *im6;
1689
1690#ifdef MRT6DEBUG
1691 if (V_mrt6debug) {
1692 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1693 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1694 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1695 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1696 }
1697#endif
1698 ++pim6stat.pim6s_snd_registers;
1699
1700 /* Make a copy of the packet to send to the user level process */
1701 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1702 if (mm == NULL)
1703 return (ENOBUFS);
1704 mm->m_pkthdr.rcvif = NULL;
1705 mm->m_data += max_linkhdr;
1706 mm->m_len = sizeof(struct ip6_hdr);
1707
1708 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1709 m_freem(mm);
1710 return (ENOBUFS);
1711 }
1712 i = MHLEN - M_LEADINGSPACE(mm);
1713 if (i > len)
1714 i = len;
1715 mm = m_pullup(mm, i);
1716 if (mm == NULL)
1717 return (ENOBUFS);
1718/* TODO: check it! */
1719 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1720
1721 /*
1722 * Send message to routing daemon
1723 */
1724 sin6.sin6_addr = ip6->ip6_src;
1725
1726 im6 = mtod(mm, struct mrt6msg *);
1727 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1728 im6->im6_mbz = 0;
1729
1730 im6->im6_mif = mif - mif6table;
1731
1732 /* iif info is not given for reg. encap.n */
1733 mrt6stat.mrt6s_upcalls++;
1734
1735 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1736#ifdef MRT6DEBUG
1737 if (V_mrt6debug)
1738 log(LOG_WARNING,
1739 "register_send: ip6_mrouter socket queue full\n");
1740#endif
1741 ++mrt6stat.mrt6s_upq_sockfull;
1742 return (ENOBUFS);
1743 }
1744 return (0);
1745}
1746
1747/*
1748 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1749 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1750 * into the kernel.
1751 */
1752static int
1753pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1754{
1755
1756#ifdef DIAGNOSTIC
1757 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1758#endif
1759 if (proto != IPPROTO_PIM)
1760 return 0; /* not for us; reject the datagram. */
1761
1762 return 64; /* claim the datagram. */
1763}
1764
1765/*
1766 * PIM sparse mode hook
1767 * Receives the pim control messages, and passes them up to the listening
1768 * socket, using rip6_input.
1769 * The only message processed is the REGISTER pim message; the pim header
1770 * is stripped off, and the inner packet is passed to register_mforward.
1771 */
1772int
1773pim6_input(struct mbuf **mp, int *offp, int proto)
1774{
1775 struct pim *pim; /* pointer to a pim struct */
1776 struct ip6_hdr *ip6;
1777 int pimlen;
1778 struct mbuf *m = *mp;
1779 int minlen;
1780 int off = *offp;
1781
1782 ++pim6stat.pim6s_rcv_total;
1783
1784 ip6 = mtod(m, struct ip6_hdr *);
1785 pimlen = m->m_pkthdr.len - *offp;
1786
1787 /*
1788 * Validate lengths
1789 */
1790 if (pimlen < PIM_MINLEN) {
1791 ++pim6stat.pim6s_rcv_tooshort;
1792#ifdef MRT6DEBUG
1793 if (V_mrt6debug & DEBUG_PIM)
1794 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1795#endif
1796 m_freem(m);
1797 return (IPPROTO_DONE);
1798 }
1799
1800 /*
1801 * if the packet is at least as big as a REGISTER, go ahead
1802 * and grab the PIM REGISTER header size, to avoid another
1803 * possible m_pullup() later.
1804 *
1805 * PIM_MINLEN == pimhdr + u_int32 == 8
1806 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1807 */
1808 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1809
1810 /*
1811 * Make sure that the IP6 and PIM headers in contiguous memory, and
1812 * possibly the PIM REGISTER header
1813 */
1814#ifndef PULLDOWN_TEST
1815 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1816 /* adjust pointer */
1817 ip6 = mtod(m, struct ip6_hdr *);
1818
1819 /* adjust mbuf to point to the PIM header */
1820 pim = (struct pim *)((caddr_t)ip6 + off);
1821#else
1822 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1823 if (pim == NULL) {
1824 pim6stat.pim6s_rcv_tooshort++;
1825 return (IPPROTO_DONE);
1826 }
1827#endif
1828
1829#define PIM6_CHECKSUM
1830#ifdef PIM6_CHECKSUM
1831 {
1832 int cksumlen;
1833
1834 /*
1835 * Validate checksum.
1836 * If PIM REGISTER, exclude the data packet
1837 */
1838 if (pim->pim_type == PIM_REGISTER)
1839 cksumlen = PIM_MINLEN;
1840 else
1841 cksumlen = pimlen;
1842
1843 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1844 ++pim6stat.pim6s_rcv_badsum;
1845#ifdef MRT6DEBUG
1846 if (V_mrt6debug & DEBUG_PIM)
1847 log(LOG_DEBUG,
1848 "pim6_input: invalid checksum\n");
1849#endif
1850 m_freem(m);
1851 return (IPPROTO_DONE);
1852 }
1853 }
1854#endif /* PIM_CHECKSUM */
1855
1856 /* PIM version check */
1857 if (pim->pim_ver != PIM_VERSION) {
1858 ++pim6stat.pim6s_rcv_badversion;
1859#ifdef MRT6DEBUG
1860 log(LOG_ERR,
1861 "pim6_input: incorrect version %d, expecting %d\n",
1862 pim->pim_ver, PIM_VERSION);
1863#endif
1864 m_freem(m);
1865 return (IPPROTO_DONE);
1866 }
1867
1868 if (pim->pim_type == PIM_REGISTER) {
1869 /*
1870 * since this is a REGISTER, we'll make a copy of the register
1871 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1872 * routing daemon.
1873 */
1874 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1875
1876 struct mbuf *mcp;
1877 struct ip6_hdr *eip6;
1878 u_int32_t *reghdr;
1879 int rc;
1880#ifdef MRT6DEBUG
1881 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1882#endif
1883
1884 ++pim6stat.pim6s_rcv_registers;
1885
1886 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1887#ifdef MRT6DEBUG
1888 if (V_mrt6debug & DEBUG_PIM)
1889 log(LOG_DEBUG,
1890 "pim6_input: register mif not set: %d\n",
1891 reg_mif_num);
1892#endif
1893 m_freem(m);
1894 return (IPPROTO_DONE);
1895 }
1896
1897 reghdr = (u_int32_t *)(pim + 1);
1898
1899 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1900 goto pim6_input_to_daemon;
1901
1902 /*
1903 * Validate length
1904 */
1905 if (pimlen < PIM6_REG_MINLEN) {
1906 ++pim6stat.pim6s_rcv_tooshort;
1907 ++pim6stat.pim6s_rcv_badregisters;
1908#ifdef MRT6DEBUG
1909 log(LOG_ERR,
1910 "pim6_input: register packet size too "
1911 "small %d from %s\n",
1912 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1913#endif
1914 m_freem(m);
1915 return (IPPROTO_DONE);
1916 }
1917
1918 eip6 = (struct ip6_hdr *) (reghdr + 1);
1919#ifdef MRT6DEBUG
1920 if (V_mrt6debug & DEBUG_PIM)
1921 log(LOG_DEBUG,
1922 "pim6_input[register], eip6: %s -> %s, "
1923 "eip6 plen %d\n",
1924 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1925 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1926 ntohs(eip6->ip6_plen));
1927#endif
1928
1929 /* verify the version number of the inner packet */
1930 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1931 ++pim6stat.pim6s_rcv_badregisters;
1932#ifdef MRT6DEBUG
1933 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1934 "of the inner packet\n",
1935 (eip6->ip6_vfc & IPV6_VERSION));
1936#endif
1937 m_freem(m);
1938 return (IPPROTO_NONE);
1939 }
1940
1941 /* verify the inner packet is destined to a mcast group */
1942 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1943 ++pim6stat.pim6s_rcv_badregisters;
1944#ifdef MRT6DEBUG
1945 if (V_mrt6debug & DEBUG_PIM)
1946 log(LOG_DEBUG,
1947 "pim6_input: inner packet of register "
1948 "is not multicast %s\n",
1949 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1950#endif
1951 m_freem(m);
1952 return (IPPROTO_DONE);
1953 }
1954
1955 /*
1956 * make a copy of the whole header to pass to the daemon later.
1957 */
1958 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1959 if (mcp == NULL) {
1960#ifdef MRT6DEBUG
1961 log(LOG_ERR,
1962 "pim6_input: pim register: "
1963 "could not copy register head\n");
1964#endif
1965 m_freem(m);
1966 return (IPPROTO_DONE);
1967 }
1968
1969 /*
1970 * forward the inner ip6 packet; point m_data at the inner ip6.
1971 */
1972 m_adj(m, off + PIM_MINLEN);
1973#ifdef MRT6DEBUG
1974 if (V_mrt6debug & DEBUG_PIM) {
1975 log(LOG_DEBUG,
1976 "pim6_input: forwarding decapsulated register: "
1977 "src %s, dst %s, mif %d\n",
1978 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1979 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1980 reg_mif_num);
1981 }
1982#endif
1983
1984 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1985 dst.sin6_family, 0);
1986
1987 /* prepare the register head to send to the mrouting daemon */
1988 m = mcp;
1989 }
1990
1991 /*
1992 * Pass the PIM message up to the daemon; if it is a register message
1993 * pass the 'head' only up to the daemon. This includes the
1994 * encapsulator ip6 header, pim header, register header and the
1995 * encapsulated ip6 header.
1996 */
1997 pim6_input_to_daemon:
1998 rip6_input(&m, offp, proto);
1999 return (IPPROTO_DONE);
2000}
2001
2002static int
2003ip6_mroute_modevent(module_t mod, int type, void *unused)
2004{
2005
2006 switch (type) {
2007 case MOD_LOAD:
2008 MROUTER6_LOCK_INIT();
2009 MFC6_LOCK_INIT();
2010 MIF6_LOCK_INIT();
2011
2012 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
2013 pim6_encapcheck,
2014 (const struct protosw *)&in6_pim_protosw, NULL);
2015 if (pim6_encap_cookie == NULL) {
2016 printf("ip6_mroute: unable to attach pim6 encap\n");
2017 MIF6_LOCK_DESTROY();
2018 MFC6_LOCK_DESTROY();
2019 MROUTER6_LOCK_DESTROY();
2020 return (EINVAL);
2021 }
2022
2023 ip6_mforward = X_ip6_mforward;
2024 ip6_mrouter_done = X_ip6_mrouter_done;
2025 ip6_mrouter_get = X_ip6_mrouter_get;
2026 ip6_mrouter_set = X_ip6_mrouter_set;
2027 mrt6_ioctl = X_mrt6_ioctl;
2028 break;
2029
2030 case MOD_UNLOAD:
2031 if (V_ip6_mrouter != NULL)
2032 return EINVAL;
2033
2034 if (pim6_encap_cookie) {
2035 encap_detach(pim6_encap_cookie);
2036 pim6_encap_cookie = NULL;
2037 }
2038 X_ip6_mrouter_done();
2039 ip6_mforward = NULL;
2040 ip6_mrouter_done = NULL;
2041 ip6_mrouter_get = NULL;
2042 ip6_mrouter_set = NULL;
2043 mrt6_ioctl = NULL;
2044
2045 MIF6_LOCK_DESTROY();
2046 MFC6_LOCK_DESTROY();
2047 MROUTER6_LOCK_DESTROY();
2048 break;
2049
2050 default:
2051 return (EOPNOTSUPP);
2052 }
2053
2054 return (0);
2055}
2056
2057static moduledata_t ip6_mroutemod = {
2058 "ip6_mroute",
2059 ip6_mroute_modevent,
2060 0
2061};
2062
2063DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
2 * Copyright (C) 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
30 */
31
32/*-
33 * Copyright (c) 1989 Stephen Deering
34 * Copyright (c) 1992, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * Stephen Deering of Stanford University.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
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.
51 *
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
62 * SUCH DAMAGE.
63 *
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
66 */
67
68/*
69 * IP multicast forwarding procedures
70 *
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
77 *
78 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
79 */
80
81#include <sys/cdefs.h>
82__FBSDID("$FreeBSD: head/sys/netinet6/ip6_mroute.c 207369 2010-04-29 11:52:42Z bz $");
83
84#include "opt_inet.h"
85#include "opt_inet6.h"
86
87#include <sys/param.h>
88#include <sys/callout.h>
89#include <sys/errno.h>
90#include <sys/kernel.h>
91#include <sys/lock.h>
92#include <sys/malloc.h>
93#include <sys/mbuf.h>
94#include <sys/module.h>
95#include <sys/domain.h>
96#include <sys/protosw.h>
97#include <sys/signalvar.h>
98#include <sys/socket.h>
99#include <sys/socketvar.h>
100#include <sys/sockio.h>
101#include <sys/sx.h>
102#include <sys/sysctl.h>
103#include <sys/syslog.h>
104#include <sys/systm.h>
105#include <sys/time.h>
106
107#include <net/if.h>
108#include <net/if_types.h>
109#include <net/raw_cb.h>
110#include <net/vnet.h>
111
112#include <netinet/in.h>
113#include <netinet/in_var.h>
114#include <netinet/icmp6.h>
115#include <netinet/ip_encap.h>
116
117#include <netinet/ip6.h>
118#include <netinet6/ip6_var.h>
119#include <netinet6/scope6_var.h>
120#include <netinet6/nd6.h>
121#include <netinet6/ip6_mroute.h>
122#include <netinet6/ip6protosw.h>
123#include <netinet6/pim6.h>
124#include <netinet6/pim6_var.h>
125
126static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
127
128/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
129#define M_HASCL(m) ((m)->m_flags & M_EXT)
130
131static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
132static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
133static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
134static int set_pim6(int *);
135static int socket_send(struct socket *, struct mbuf *,
136 struct sockaddr_in6 *);
137
138extern int in6_mcast_loop;
139extern struct domain inet6domain;
140
141static const struct encaptab *pim6_encap_cookie;
142static const struct ip6protosw in6_pim_protosw = {
143 .pr_type = SOCK_RAW,
144 .pr_domain = &inet6domain,
145 .pr_protocol = IPPROTO_PIM,
146 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
147 .pr_input = pim6_input,
148 .pr_output = rip6_output,
149 .pr_ctloutput = rip6_ctloutput,
150 .pr_usrreqs = &rip6_usrreqs
151};
152static int pim6_encapcheck(const struct mbuf *, int, int, void *);
153
154static VNET_DEFINE(int, ip6_mrouter_ver) = 0;
155#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
156
157SYSCTL_DECL(_net_inet6);
158SYSCTL_DECL(_net_inet6_ip6);
159SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
160
161static struct mrt6stat mrt6stat;
162SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
163 &mrt6stat, mrt6stat,
164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
165
166#define NO_RTE_FOUND 0x1
167#define RTE_FOUND 0x2
168
169static 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(); \
175} while (0)
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)
179
180static struct mf6c *mf6ctable[MF6CTBLSIZ];
181SYSCTL_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)");
185
186static 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(); \
192} while (0)
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)
196
197static u_char n6expire[MF6CTBLSIZ];
198
199static struct mif6 mif6table[MAXMIFS];
200SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
201 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
202 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
203
204static struct mtx mif6_mtx;
205#define MIF6_LOCK() mtx_lock(&mif6_mtx)
206#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
207#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
208#define MIF6_LOCK_INIT() \
209 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
210#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
211
212#ifdef MRT6DEBUG
213static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */
214#define V_mrt6debug VNET(mrt6debug)
215#define DEBUG_MFC 0x02
216#define DEBUG_FORWARD 0x04
217#define DEBUG_EXPIRE 0x08
218#define DEBUG_XMIT 0x10
219#define DEBUG_REG 0x20
220#define DEBUG_PIM 0x40
221#endif
222
223static void expire_upcalls(void *);
224#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
225#define UPCALL_EXPIRE 6 /* number of timeouts */
226
227/*
228 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
229 */
230
231/*
232 * 'Interfaces' associated with decapsulator (so we can tell
233 * packets that went through it from ones that get reflected
234 * by a broken gateway). Different from IPv4 register_if,
235 * these interfaces are linked into the system ifnet list,
236 * because per-interface IPv6 statistics are maintained in
237 * ifp->if_afdata. But it does not have any routes point
238 * to them. I.e., packets can't be sent this way. They
239 * only exist as a placeholder for multicast source
240 * verification.
241 */
242static struct ifnet *multicast_register_if6;
243
244#define ENCAP_HOPS 64
245
246/*
247 * Private variables.
248 */
249static mifi_t nummifs = 0;
250static mifi_t reg_mif_num = (mifi_t)-1;
251
252static struct pim6stat pim6stat;
253SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
254 &pim6stat, pim6stat,
255 "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
256
257static VNET_DEFINE(int, pim6);
258#define V_pim6 VNET(pim6)
259
260/*
261 * Hash function for a source, group entry
262 */
263#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
264 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
265 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
266 (g).s6_addr32[2] ^ (g).s6_addr32[3])
267
268/*
269 * Find a route for a given origin IPv6 address and Multicast group address.
270 */
271#define MF6CFIND(o, g, rt) do { \
272 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
273 rt = NULL; \
274 mrt6stat.mrt6s_mfc_lookups++; \
275 while (_rt) { \
276 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
277 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
278 (_rt->mf6c_stall == NULL)) { \
279 rt = _rt; \
280 break; \
281 } \
282 _rt = _rt->mf6c_next; \
283 } \
284 if (rt == NULL) { \
285 mrt6stat.mrt6s_mfc_misses++; \
286 } \
287} while (/*CONSTCOND*/ 0)
288
289/*
290 * Macros to compute elapsed time efficiently
291 * Borrowed from Van Jacobson's scheduling code
292 * XXX: replace with timersub() ?
293 */
294#define TV_DELTA(a, b, delta) do { \
295 int xxs; \
296 \
297 delta = (a).tv_usec - (b).tv_usec; \
298 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
299 switch (xxs) { \
300 case 2: \
301 delta += 1000000; \
302 /* FALLTHROUGH */ \
303 case 1: \
304 delta += 1000000; \
305 break; \
306 default: \
307 delta += (1000000 * xxs); \
308 } \
309 } \
310} while (/*CONSTCOND*/ 0)
311
312/* XXX: replace with timercmp(a, b, <) ? */
313#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
314 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
315
316#ifdef UPCALL_TIMING
317#define UPCALL_MAX 50
318static u_long upcall_data[UPCALL_MAX + 1];
319static void collate();
320#endif /* UPCALL_TIMING */
321
322static int ip6_mrouter_init(struct socket *, int, int);
323static int add_m6fc(struct mf6cctl *);
324static int add_m6if(struct mif6ctl *);
325static int del_m6fc(struct mf6cctl *);
326static int del_m6if(mifi_t *);
327static int del_m6if_locked(mifi_t *);
328static int get_mif6_cnt(struct sioc_mif_req6 *);
329static int get_sg_cnt(struct sioc_sg_req6 *);
330
331static struct callout expire_upcalls_ch;
332
333int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
334int X_ip6_mrouter_done(void);
335int X_ip6_mrouter_set(struct socket *, struct sockopt *);
336int X_ip6_mrouter_get(struct socket *, struct sockopt *);
337int X_mrt6_ioctl(u_long, caddr_t);
338
339/*
340 * Handle MRT setsockopt commands to modify the multicast routing tables.
341 */
342int
343X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
344{
345 int error = 0;
346 int optval;
347 struct mif6ctl mifc;
348 struct mf6cctl mfcc;
349 mifi_t mifi;
350
351 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
352 return (EACCES);
353
354 switch (sopt->sopt_name) {
355 case MRT6_INIT:
356#ifdef MRT6_OINIT
357 case MRT6_OINIT:
358#endif
359 error = sooptcopyin(sopt, &optval, sizeof(optval),
360 sizeof(optval));
361 if (error)
362 break;
363 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
364 break;
365 case MRT6_DONE:
366 error = X_ip6_mrouter_done();
367 break;
368 case MRT6_ADD_MIF:
369 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
370 if (error)
371 break;
372 error = add_m6if(&mifc);
373 break;
374 case MRT6_ADD_MFC:
375 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
376 if (error)
377 break;
378 error = add_m6fc(&mfcc);
379 break;
380 case MRT6_DEL_MFC:
381 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
382 if (error)
383 break;
384 error = del_m6fc(&mfcc);
385 break;
386 case MRT6_DEL_MIF:
387 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
388 if (error)
389 break;
390 error = del_m6if(&mifi);
391 break;
392 case MRT6_PIM:
393 error = sooptcopyin(sopt, &optval, sizeof(optval),
394 sizeof(optval));
395 if (error)
396 break;
397 error = set_pim6(&optval);
398 break;
399 default:
400 error = EOPNOTSUPP;
401 break;
402 }
403
404 return (error);
405}
406
407/*
408 * Handle MRT getsockopt commands
409 */
410int
411X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
412{
413 int error = 0;
414
415 if (so != V_ip6_mrouter)
416 return (EACCES);
417
418 switch (sopt->sopt_name) {
419 case MRT6_PIM:
420 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
421 break;
422 }
423 return (error);
424}
425
426/*
427 * Handle ioctl commands to obtain information from the cache
428 */
429int
430X_mrt6_ioctl(u_long cmd, caddr_t data)
431{
432 int ret;
433
434 ret = EINVAL;
435
436 switch (cmd) {
437 case SIOCGETSGCNT_IN6:
438 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
439 break;
440
441 case SIOCGETMIFCNT_IN6:
442 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
443 break;
444
445 default:
446 break;
447 }
448
449 return (ret);
450}
451
452/*
453 * returns the packet, byte, rpf-failure count for the source group provided
454 */
455static int
456get_sg_cnt(struct sioc_sg_req6 *req)
457{
458 struct mf6c *rt;
459 int ret;
460
461 ret = 0;
462
463 MFC6_LOCK();
464
465 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
466 if (rt == NULL) {
467 ret = ESRCH;
468 } else {
469 req->pktcnt = rt->mf6c_pkt_cnt;
470 req->bytecnt = rt->mf6c_byte_cnt;
471 req->wrong_if = rt->mf6c_wrong_if;
472 }
473
474 MFC6_UNLOCK();
475
476 return (ret);
477}
478
479/*
480 * returns the input and output packet and byte counts on the mif provided
481 */
482static int
483get_mif6_cnt(struct sioc_mif_req6 *req)
484{
485 mifi_t mifi;
486 int ret;
487
488 ret = 0;
489 mifi = req->mifi;
490
491 MIF6_LOCK();
492
493 if (mifi >= nummifs) {
494 ret = EINVAL;
495 } else {
496 req->icount = mif6table[mifi].m6_pkt_in;
497 req->ocount = mif6table[mifi].m6_pkt_out;
498 req->ibytes = mif6table[mifi].m6_bytes_in;
499 req->obytes = mif6table[mifi].m6_bytes_out;
500 }
501
502 MIF6_UNLOCK();
503
504 return (ret);
505}
506
507static int
508set_pim6(int *i)
509{
510 if ((*i != 1) && (*i != 0))
511 return (EINVAL);
512
513 V_pim6 = *i;
514
515 return (0);
516}
517
518/*
519 * Enable multicast routing
520 */
521static int
522ip6_mrouter_init(struct socket *so, int v, int cmd)
523{
524
525#ifdef MRT6DEBUG
526 if (V_mrt6debug)
527 log(LOG_DEBUG,
528 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
529 so->so_type, so->so_proto->pr_protocol);
530#endif
531
532 if (so->so_type != SOCK_RAW ||
533 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
534 return (EOPNOTSUPP);
535
536 if (v != 1)
537 return (ENOPROTOOPT);
538
539 MROUTER6_LOCK();
540
541 if (V_ip6_mrouter != NULL) {
542 MROUTER6_UNLOCK();
543 return (EADDRINUSE);
544 }
545
546 V_ip6_mrouter = so;
547 V_ip6_mrouter_ver = cmd;
548
549 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
550 bzero((caddr_t)n6expire, sizeof(n6expire));
551
552 V_pim6 = 0;/* used for stubbing out/in pim stuff */
553
554 callout_init(&expire_upcalls_ch, 0);
555 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
556 expire_upcalls, NULL);
557
558 MROUTER6_UNLOCK();
559
560#ifdef MRT6DEBUG
561 if (V_mrt6debug)
562 log(LOG_DEBUG, "ip6_mrouter_init\n");
563#endif
564
565 return (0);
566}
567
568/*
569 * Disable IPv6 multicast forwarding.
570 */
571int
572X_ip6_mrouter_done(void)
573{
574 mifi_t mifi;
575 int i;
576 struct mf6c *rt;
577 struct rtdetq *rte;
578
579 MROUTER6_LOCK();
580
581 if (V_ip6_mrouter == NULL) {
582 MROUTER6_UNLOCK();
583 return (EINVAL);
584 }
585
586 /*
587 * For each phyint in use, disable promiscuous reception of all IPv6
588 * multicasts.
589 */
590 for (mifi = 0; mifi < nummifs; mifi++) {
591 if (mif6table[mifi].m6_ifp &&
592 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
593 if_allmulti(mif6table[mifi].m6_ifp, 0);
594 }
595 }
596 bzero((caddr_t)mif6table, sizeof(mif6table));
597 nummifs = 0;
598
599 V_pim6 = 0; /* used to stub out/in pim specific code */
600
601 callout_stop(&expire_upcalls_ch);
602
603 /*
604 * Free all multicast forwarding cache entries.
605 */
606 MFC6_LOCK();
607 for (i = 0; i < MF6CTBLSIZ; i++) {
608 rt = mf6ctable[i];
609 while (rt) {
610 struct mf6c *frt;
611
612 for (rte = rt->mf6c_stall; rte != NULL; ) {
613 struct rtdetq *n = rte->next;
614
615 m_free(rte->m);
616 free(rte, M_MRTABLE6);
617 rte = n;
618 }
619 frt = rt;
620 rt = rt->mf6c_next;
621 free(frt, M_MRTABLE6);
622 }
623 }
624 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
625 MFC6_UNLOCK();
626
627 /*
628 * Reset register interface
629 */
630 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
631 if_detach(multicast_register_if6);
632 if_free(multicast_register_if6);
633 reg_mif_num = (mifi_t)-1;
634 multicast_register_if6 = NULL;
635 }
636
637 V_ip6_mrouter = NULL;
638 V_ip6_mrouter_ver = 0;
639
640 MROUTER6_UNLOCK();
641
642#ifdef MRT6DEBUG
643 if (V_mrt6debug)
644 log(LOG_DEBUG, "ip6_mrouter_done\n");
645#endif
646
647 return (0);
648}
649
650static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
651
652/*
653 * Add a mif to the mif table
654 */
655static int
656add_m6if(struct mif6ctl *mifcp)
657{
658 struct mif6 *mifp;
659 struct ifnet *ifp;
660 int error;
661
662 MIF6_LOCK();
663
664 if (mifcp->mif6c_mifi >= MAXMIFS) {
665 MIF6_UNLOCK();
666 return (EINVAL);
667 }
668 mifp = mif6table + mifcp->mif6c_mifi;
669 if (mifp->m6_ifp != NULL) {
670 MIF6_UNLOCK();
671 return (EADDRINUSE); /* XXX: is it appropriate? */
672 }
673 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
674 MIF6_UNLOCK();
675 return (ENXIO);
676 }
677
678 ifp = ifnet_byindex(mifcp->mif6c_pifi);
679
680 if (mifcp->mif6c_flags & MIFF_REGISTER) {
681 if (reg_mif_num == (mifi_t)-1) {
682 ifp = if_alloc(IFT_OTHER);
683
684 if_initname(ifp, "register_mif", 0);
685 ifp->if_flags |= IFF_LOOPBACK;
686 if_attach(ifp);
687 multicast_register_if6 = ifp;
688 reg_mif_num = mifcp->mif6c_mifi;
689 /*
690 * it is impossible to guess the ifindex of the
691 * register interface. So mif6c_pifi is automatically
692 * calculated.
693 */
694 mifcp->mif6c_pifi = ifp->if_index;
695 } else {
696 ifp = multicast_register_if6;
697 }
698 } else {
699 /* Make sure the interface supports multicast */
700 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
701 MIF6_UNLOCK();
702 return (EOPNOTSUPP);
703 }
704
705 error = if_allmulti(ifp, 1);
706 if (error) {
707 MIF6_UNLOCK();
708 return (error);
709 }
710 }
711
712 mifp->m6_flags = mifcp->mif6c_flags;
713 mifp->m6_ifp = ifp;
714
715 /* initialize per mif pkt counters */
716 mifp->m6_pkt_in = 0;
717 mifp->m6_pkt_out = 0;
718 mifp->m6_bytes_in = 0;
719 mifp->m6_bytes_out = 0;
720 bzero(&mifp->m6_route, sizeof(mifp->m6_route));
721
722 /* Adjust nummifs up if the mifi is higher than nummifs */
723 if (nummifs <= mifcp->mif6c_mifi)
724 nummifs = mifcp->mif6c_mifi + 1;
725
726 MIF6_UNLOCK();
727
728#ifdef MRT6DEBUG
729 if (V_mrt6debug)
730 log(LOG_DEBUG,
731 "add_mif #%d, phyint %s\n",
732 mifcp->mif6c_mifi,
733 ifp->if_xname);
734#endif
735
736 return (0);
737}
738
739/*
740 * Delete a mif from the mif table
741 */
742static int
743del_m6if_locked(mifi_t *mifip)
744{
745 struct mif6 *mifp = mif6table + *mifip;
746 mifi_t mifi;
747 struct ifnet *ifp;
748
749 MIF6_LOCK_ASSERT();
750
751 if (*mifip >= nummifs)
752 return (EINVAL);
753 if (mifp->m6_ifp == NULL)
754 return (EINVAL);
755
756 if (!(mifp->m6_flags & MIFF_REGISTER)) {
757 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
758 ifp = mifp->m6_ifp;
759 if_allmulti(ifp, 0);
760 } else {
761 if (reg_mif_num != (mifi_t)-1 &&
762 multicast_register_if6 != NULL) {
763 if_detach(multicast_register_if6);
764 if_free(multicast_register_if6);
765 reg_mif_num = (mifi_t)-1;
766 multicast_register_if6 = NULL;
767 }
768 }
769
770 bzero((caddr_t)mifp, sizeof(*mifp));
771
772 /* Adjust nummifs down */
773 for (mifi = nummifs; mifi > 0; mifi--)
774 if (mif6table[mifi - 1].m6_ifp)
775 break;
776 nummifs = mifi;
777
778#ifdef MRT6DEBUG
779 if (V_mrt6debug)
780 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
781#endif
782
783 return (0);
784}
785
786static int
787del_m6if(mifi_t *mifip)
788{
789 int cc;
790
791 MIF6_LOCK();
792 cc = del_m6if_locked(mifip);
793 MIF6_UNLOCK();
794
795 return (cc);
796}
797
798/*
799 * Add an mfc entry
800 */
801static int
802add_m6fc(struct mf6cctl *mfccp)
803{
804 struct mf6c *rt;
805 u_long hash;
806 struct rtdetq *rte;
807 u_short nstl;
808 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
809
810 MFC6_LOCK();
811
812 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
813 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
814
815 /* If an entry already exists, just update the fields */
816 if (rt) {
817#ifdef MRT6DEBUG
818 if (V_mrt6debug & DEBUG_MFC) {
819 log(LOG_DEBUG,
820 "add_m6fc no upcall h %d o %s g %s p %x\n",
821 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
822 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
823 mfccp->mf6cc_parent);
824 }
825#endif
826
827 rt->mf6c_parent = mfccp->mf6cc_parent;
828 rt->mf6c_ifset = mfccp->mf6cc_ifset;
829
830 MFC6_UNLOCK();
831 return (0);
832 }
833
834 /*
835 * Find the entry for which the upcall was made and update
836 */
837 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
838 mfccp->mf6cc_mcastgrp.sin6_addr);
839 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
840 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
841 &mfccp->mf6cc_origin.sin6_addr) &&
842 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
843 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
844 (rt->mf6c_stall != NULL)) {
845
846 if (nstl++)
847 log(LOG_ERR,
848 "add_m6fc: %s o %s g %s p %x dbx %p\n",
849 "multiple kernel entries",
850 ip6_sprintf(ip6bufo,
851 &mfccp->mf6cc_origin.sin6_addr),
852 ip6_sprintf(ip6bufg,
853 &mfccp->mf6cc_mcastgrp.sin6_addr),
854 mfccp->mf6cc_parent, rt->mf6c_stall);
855
856#ifdef MRT6DEBUG
857 if (V_mrt6debug & DEBUG_MFC)
858 log(LOG_DEBUG,
859 "add_m6fc o %s g %s p %x dbg %x\n",
860 ip6_sprintf(ip6bufo,
861 &mfccp->mf6cc_origin.sin6_addr),
862 ip6_sprintf(ip6bufg,
863 &mfccp->mf6cc_mcastgrp.sin6_addr),
864 mfccp->mf6cc_parent, rt->mf6c_stall);
865#endif
866
867 rt->mf6c_origin = mfccp->mf6cc_origin;
868 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
869 rt->mf6c_parent = mfccp->mf6cc_parent;
870 rt->mf6c_ifset = mfccp->mf6cc_ifset;
871 /* initialize pkt counters per src-grp */
872 rt->mf6c_pkt_cnt = 0;
873 rt->mf6c_byte_cnt = 0;
874 rt->mf6c_wrong_if = 0;
875
876 rt->mf6c_expire = 0; /* Don't clean this guy up */
877 n6expire[hash]--;
878
879 /* free packets Qed at the end of this entry */
880 for (rte = rt->mf6c_stall; rte != NULL; ) {
881 struct rtdetq *n = rte->next;
882 ip6_mdq(rte->m, rte->ifp, rt);
883 m_freem(rte->m);
884#ifdef UPCALL_TIMING
885 collate(&(rte->t));
886#endif /* UPCALL_TIMING */
887 free(rte, M_MRTABLE6);
888 rte = n;
889 }
890 rt->mf6c_stall = NULL;
891 }
892 }
893
894 /*
895 * It is possible that an entry is being inserted without an upcall
896 */
897 if (nstl == 0) {
898#ifdef MRT6DEBUG
899 if (V_mrt6debug & DEBUG_MFC)
900 log(LOG_DEBUG,
901 "add_mfc no upcall h %d o %s g %s p %x\n",
902 hash,
903 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
904 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
905 mfccp->mf6cc_parent);
906#endif
907
908 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
909
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)) {
914
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;
923
924 if (rt->mf6c_expire)
925 n6expire[hash]--;
926 rt->mf6c_expire = 0;
927 }
928 }
929 if (rt == NULL) {
930 /* no upcall, so make a new entry */
931 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
932 M_NOWAIT);
933 if (rt == NULL) {
934 MFC6_UNLOCK();
935 return (ENOBUFS);
936 }
937
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;
947 rt->mf6c_expire = 0;
948 rt->mf6c_stall = NULL;
949
950 /* link into table */
951 rt->mf6c_next = mf6ctable[hash];
952 mf6ctable[hash] = rt;
953 }
954 }
955
956 MFC6_UNLOCK();
957 return (0);
958}
959
960#ifdef UPCALL_TIMING
961/*
962 * collect delay statistics on the upcalls
963 */
964static void
965collate(struct timeval *t)
966{
967 u_long d;
968 struct timeval tp;
969 u_long delta;
970
971 GET_TIME(tp);
972
973 if (TV_LT(*t, tp))
974 {
975 TV_DELTA(tp, *t, delta);
976
977 d = delta >> 10;
978 if (d > UPCALL_MAX)
979 d = UPCALL_MAX;
980
981 ++upcall_data[d];
982 }
983}
984#endif /* UPCALL_TIMING */
985
986/*
987 * Delete an mfc entry
988 */
989static int
990del_m6fc(struct mf6cctl *mfccp)
991{
992 struct sockaddr_in6 origin;
993 struct sockaddr_in6 mcastgrp;
994 struct mf6c *rt;
995 struct mf6c **nptr;
996 u_long hash;
997
998 origin = mfccp->mf6cc_origin;
999 mcastgrp = mfccp->mf6cc_mcastgrp;
1000 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1001
1002#ifdef MRT6DEBUG
1003 if (V_mrt6debug & DEBUG_MFC) {
1004 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1005 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
1006 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1007 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1008 }
1009#endif
1010
1011 MFC6_LOCK();
1012
1013 nptr = &mf6ctable[hash];
1014 while ((rt = *nptr) != NULL) {
1015 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1016 &rt->mf6c_origin.sin6_addr) &&
1017 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1018 &rt->mf6c_mcastgrp.sin6_addr) &&
1019 rt->mf6c_stall == NULL)
1020 break;
1021
1022 nptr = &rt->mf6c_next;
1023 }
1024 if (rt == NULL) {
1025 MFC6_UNLOCK();
1026 return (EADDRNOTAVAIL);
1027 }
1028
1029 *nptr = rt->mf6c_next;
1030 free(rt, M_MRTABLE6);
1031
1032 MFC6_UNLOCK();
1033
1034 return (0);
1035}
1036
1037static int
1038socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1039{
1040
1041 if (s) {
1042 if (sbappendaddr(&s->so_rcv,
1043 (struct sockaddr *)src,
1044 mm, (struct mbuf *)0) != 0) {
1045 sorwakeup(s);
1046 return (0);
1047 }
1048 }
1049 m_freem(mm);
1050 return (-1);
1051}
1052
1053/*
1054 * IPv6 multicast forwarding function. This function assumes that the packet
1055 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1056 * pointed to by "ifp", and the packet is to be relayed to other networks
1057 * that have members of the packet's destination IPv6 multicast group.
1058 *
1059 * The packet is returned unscathed to the caller, unless it is
1060 * erroneous, in which case a non-zero return value tells the caller to
1061 * discard it.
1062 *
1063 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1064 * this function is called in the originating context (i.e., not when
1065 * forwarding a packet from other node). ip6_output(), which is currently the
1066 * only function that calls this function is called in the originating context,
1067 * explicitly ensures this condition. It is caller's responsibility to ensure
1068 * that if this function is called from somewhere else in the originating
1069 * context in the future.
1070 */
1071int
1072X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1073{
1074 struct mf6c *rt;
1075 struct mif6 *mifp;
1076 struct mbuf *mm;
1077 mifi_t mifi;
1078 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1079
1080#ifdef MRT6DEBUG
1081 if (V_mrt6debug & DEBUG_FORWARD)
1082 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
1083 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1085 ifp->if_index);
1086#endif
1087
1088 /*
1089 * Don't forward a packet with Hop limit of zero or one,
1090 * or a packet destined to a local-only group.
1091 */
1092 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1093 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1094 return (0);
1095 ip6->ip6_hlim--;
1096
1097 /*
1098 * Source address check: do not forward packets with unspecified
1099 * source. It was discussed in July 2000, on ipngwg mailing list.
1100 * This is rather more serious than unicast cases, because some
1101 * MLD packets can be sent with the unspecified source address
1102 * (although such packets must normally set 1 to the hop limit field).
1103 */
1104 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1105 V_ip6stat.ip6s_cantforward++;
1106 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
1107 V_ip6_log_time = time_second;
1108 log(LOG_DEBUG,
1109 "cannot forward "
1110 "from %s to %s nxt %d received on %s\n",
1111 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1113 ip6->ip6_nxt,
1114 if_name(m->m_pkthdr.rcvif));
1115 }
1116 return (0);
1117 }
1118
1119 MFC6_LOCK();
1120
1121 /*
1122 * Determine forwarding mifs from the forwarding cache table
1123 */
1124 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1125
1126 /* Entry exists, so forward if necessary */
1127 if (rt) {
1128 MFC6_UNLOCK();
1129 return (ip6_mdq(m, ifp, rt));
1130 } else {
1131 /*
1132 * If we don't have a route for packet's origin,
1133 * Make a copy of the packet &
1134 * send message to routing daemon
1135 */
1136
1137 struct mbuf *mb0;
1138 struct rtdetq *rte;
1139 u_long hash;
1140/* int i, npkts;*/
1141#ifdef UPCALL_TIMING
1142 struct timeval tp;
1143
1144 GET_TIME(tp);
1145#endif /* UPCALL_TIMING */
1146
1147 mrt6stat.mrt6s_no_route++;
1148#ifdef MRT6DEBUG
1149 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1150 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1151 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1152 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1153#endif
1154
1155 /*
1156 * Allocate mbufs early so that we don't do extra work if we
1157 * are just going to fail anyway.
1158 */
1159 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
1160 M_NOWAIT);
1161 if (rte == NULL) {
1162 MFC6_UNLOCK();
1163 return (ENOBUFS);
1164 }
1165 mb0 = m_copy(m, 0, M_COPYALL);
1166 /*
1167 * Pullup packet header if needed before storing it,
1168 * as other references may modify it in the meantime.
1169 */
1170 if (mb0 &&
1171 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1172 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1173 if (mb0 == NULL) {
1174 free(rte, M_MRTABLE6);
1175 MFC6_UNLOCK();
1176 return (ENOBUFS);
1177 }
1178
1179 /* is there an upcall waiting for this packet? */
1180 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1181 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1182 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1183 &rt->mf6c_origin.sin6_addr) &&
1184 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1185 &rt->mf6c_mcastgrp.sin6_addr) &&
1186 (rt->mf6c_stall != NULL))
1187 break;
1188 }
1189
1190 if (rt == NULL) {
1191 struct mrt6msg *im;
1192#ifdef MRT6_OINIT
1193 struct omrt6msg *oim;
1194#endif
1195
1196 /* no upcall, so make a new entry */
1197 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
1198 M_NOWAIT);
1199 if (rt == NULL) {
1200 free(rte, M_MRTABLE6);
1201 m_freem(mb0);
1202 MFC6_UNLOCK();
1203 return (ENOBUFS);
1204 }
1205 /*
1206 * Make a copy of the header to send to the user
1207 * level process
1208 */
1209 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1210
1211 if (mm == NULL) {
1212 free(rte, M_MRTABLE6);
1213 m_freem(mb0);
1214 free(rt, M_MRTABLE6);
1215 MFC6_UNLOCK();
1216 return (ENOBUFS);
1217 }
1218
1219 /*
1220 * Send message to routing daemon
1221 */
1222 sin6.sin6_addr = ip6->ip6_src;
1223
1224 im = NULL;
1225#ifdef MRT6_OINIT
1226 oim = NULL;
1227#endif
1228 switch (V_ip6_mrouter_ver) {
1229#ifdef MRT6_OINIT
1230 case MRT6_OINIT:
1231 oim = mtod(mm, struct omrt6msg *);
1232 oim->im6_msgtype = MRT6MSG_NOCACHE;
1233 oim->im6_mbz = 0;
1234 break;
1235#endif
1236 case MRT6_INIT:
1237 im = mtod(mm, struct mrt6msg *);
1238 im->im6_msgtype = MRT6MSG_NOCACHE;
1239 im->im6_mbz = 0;
1240 break;
1241 default:
1242 free(rte, M_MRTABLE6);
1243 m_freem(mb0);
1244 free(rt, M_MRTABLE6);
1245 MFC6_UNLOCK();
1246 return (EINVAL);
1247 }
1248
1249#ifdef MRT6DEBUG
1250 if (V_mrt6debug & DEBUG_FORWARD)
1251 log(LOG_DEBUG,
1252 "getting the iif info in the kernel\n");
1253#endif
1254
1255 for (mifp = mif6table, mifi = 0;
1256 mifi < nummifs && mifp->m6_ifp != ifp;
1257 mifp++, mifi++)
1258 ;
1259
1260 switch (V_ip6_mrouter_ver) {
1261#ifdef MRT6_OINIT
1262 case MRT6_OINIT:
1263 oim->im6_mif = mifi;
1264 break;
1265#endif
1266 case MRT6_INIT:
1267 im->im6_mif = mifi;
1268 break;
1269 }
1270
1271 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1272 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1273 "socket queue full\n");
1274 mrt6stat.mrt6s_upq_sockfull++;
1275 free(rte, M_MRTABLE6);
1276 m_freem(mb0);
1277 free(rt, M_MRTABLE6);
1278 MFC6_UNLOCK();
1279 return (ENOBUFS);
1280 }
1281
1282 mrt6stat.mrt6s_upcalls++;
1283
1284 /* insert new entry at head of hash chain */
1285 bzero(rt, sizeof(*rt));
1286 rt->mf6c_origin.sin6_family = AF_INET6;
1287 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1288 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1289 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1290 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1291 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1292 rt->mf6c_expire = UPCALL_EXPIRE;
1293 n6expire[hash]++;
1294 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1295
1296 /* link into table */
1297 rt->mf6c_next = mf6ctable[hash];
1298 mf6ctable[hash] = rt;
1299 /* Add this entry to the end of the queue */
1300 rt->mf6c_stall = rte;
1301 } else {
1302 /* determine if q has overflowed */
1303 struct rtdetq **p;
1304 int npkts = 0;
1305
1306 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1307 if (++npkts > MAX_UPQ6) {
1308 mrt6stat.mrt6s_upq_ovflw++;
1309 free(rte, M_MRTABLE6);
1310 m_freem(mb0);
1311 MFC6_UNLOCK();
1312 return (0);
1313 }
1314
1315 /* Add this entry to the end of the queue */
1316 *p = rte;
1317 }
1318
1319 rte->next = NULL;
1320 rte->m = mb0;
1321 rte->ifp = ifp;
1322#ifdef UPCALL_TIMING
1323 rte->t = tp;
1324#endif /* UPCALL_TIMING */
1325
1326 MFC6_UNLOCK();
1327
1328 return (0);
1329 }
1330}
1331
1332/*
1333 * Clean up cache entries if upcalls are not serviced
1334 * Call from the Slow Timeout mechanism, every half second.
1335 */
1336static void
1337expire_upcalls(void *unused)
1338{
1339 struct rtdetq *rte;
1340 struct mf6c *mfc, **nptr;
1341 int i;
1342
1343 MFC6_LOCK();
1344 for (i = 0; i < MF6CTBLSIZ; i++) {
1345 if (n6expire[i] == 0)
1346 continue;
1347 nptr = &mf6ctable[i];
1348 while ((mfc = *nptr) != NULL) {
1349 rte = mfc->mf6c_stall;
1350 /*
1351 * Skip real cache entries
1352 * Make sure it wasn't marked to not expire (shouldn't happen)
1353 * If it expires now
1354 */
1355 if (rte != NULL &&
1356 mfc->mf6c_expire != 0 &&
1357 --mfc->mf6c_expire == 0) {
1358#ifdef MRT6DEBUG
1359 if (V_mrt6debug & DEBUG_EXPIRE) {
1360 char ip6bufo[INET6_ADDRSTRLEN];
1361 char ip6bufg[INET6_ADDRSTRLEN];
1362 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1363 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1364 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1365 }
1366#endif
1367 /*
1368 * drop all the packets
1369 * free the mbuf with the pkt, if, timing info
1370 */
1371 do {
1372 struct rtdetq *n = rte->next;
1373 m_freem(rte->m);
1374 free(rte, M_MRTABLE6);
1375 rte = n;
1376 } while (rte != NULL);
1377 mrt6stat.mrt6s_cache_cleanups++;
1378 n6expire[i]--;
1379
1380 *nptr = mfc->mf6c_next;
1381 free(mfc, M_MRTABLE6);
1382 } else {
1383 nptr = &mfc->mf6c_next;
1384 }
1385 }
1386 }
1387 MFC6_UNLOCK();
1388 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1389 expire_upcalls, NULL);
1390}
1391
1392/*
1393 * Packet forwarding routine once entry in the cache is made
1394 */
1395static int
1396ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1397{
1398 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1399 mifi_t mifi, iif;
1400 struct mif6 *mifp;
1401 int plen = m->m_pkthdr.len;
1402 struct in6_addr src0, dst0; /* copies for local work */
1403 u_int32_t iszone, idzone, oszone, odzone;
1404 int error = 0;
1405
1406/*
1407 * Macro to send packet on mif. Since RSVP packets don't get counted on
1408 * input, they shouldn't get counted on output, so statistics keeping is
1409 * separate.
1410 */
1411
1412#define MC6_SEND(ip6, mifp, m) do { \
1413 if ((mifp)->m6_flags & MIFF_REGISTER) \
1414 register_send((ip6), (mifp), (m)); \
1415 else \
1416 phyint_send((ip6), (mifp), (m)); \
1417} while (/*CONSTCOND*/ 0)
1418
1419 /*
1420 * Don't forward if it didn't arrive from the parent mif
1421 * for its origin.
1422 */
1423 mifi = rt->mf6c_parent;
1424 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1425 /* came in the wrong interface */
1426#ifdef MRT6DEBUG
1427 if (V_mrt6debug & DEBUG_FORWARD)
1428 log(LOG_DEBUG,
1429 "wrong if: ifid %d mifi %d mififid %x\n",
1430 ifp->if_index, mifi,
1431 mif6table[mifi].m6_ifp->if_index);
1432#endif
1433 mrt6stat.mrt6s_wrong_if++;
1434 rt->mf6c_wrong_if++;
1435 /*
1436 * If we are doing PIM processing, and we are forwarding
1437 * packets on this interface, send a message to the
1438 * routing daemon.
1439 */
1440 /* have to make sure this is a valid mif */
1441 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1442 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1443 /*
1444 * Check the M_LOOP flag to avoid an
1445 * unnecessary PIM assert.
1446 * XXX: M_LOOP is an ad-hoc hack...
1447 */
1448 static struct sockaddr_in6 sin6 =
1449 { sizeof(sin6), AF_INET6 };
1450
1451 struct mbuf *mm;
1452 struct mrt6msg *im;
1453#ifdef MRT6_OINIT
1454 struct omrt6msg *oim;
1455#endif
1456
1457 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1458 if (mm &&
1459 (M_HASCL(mm) ||
1460 mm->m_len < sizeof(struct ip6_hdr)))
1461 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1462 if (mm == NULL)
1463 return (ENOBUFS);
1464
1465#ifdef MRT6_OINIT
1466 oim = NULL;
1467#endif
1468 im = NULL;
1469 switch (V_ip6_mrouter_ver) {
1470#ifdef MRT6_OINIT
1471 case MRT6_OINIT:
1472 oim = mtod(mm, struct omrt6msg *);
1473 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1474 oim->im6_mbz = 0;
1475 break;
1476#endif
1477 case MRT6_INIT:
1478 im = mtod(mm, struct mrt6msg *);
1479 im->im6_msgtype = MRT6MSG_WRONGMIF;
1480 im->im6_mbz = 0;
1481 break;
1482 default:
1483 m_freem(mm);
1484 return (EINVAL);
1485 }
1486
1487 for (mifp = mif6table, iif = 0;
1488 iif < nummifs && mifp &&
1489 mifp->m6_ifp != ifp;
1490 mifp++, iif++)
1491 ;
1492
1493 switch (V_ip6_mrouter_ver) {
1494#ifdef MRT6_OINIT
1495 case MRT6_OINIT:
1496 oim->im6_mif = iif;
1497 sin6.sin6_addr = oim->im6_src;
1498 break;
1499#endif
1500 case MRT6_INIT:
1501 im->im6_mif = iif;
1502 sin6.sin6_addr = im->im6_src;
1503 break;
1504 }
1505
1506 mrt6stat.mrt6s_upcalls++;
1507
1508 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1509#ifdef MRT6DEBUG
1510 if (V_mrt6debug)
1511 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1512#endif
1513 ++mrt6stat.mrt6s_upq_sockfull;
1514 return (ENOBUFS);
1515 } /* if socket Q full */
1516 } /* if PIM */
1517 return (0);
1518 } /* if wrong iif */
1519
1520 /* If I sourced this packet, it counts as output, else it was input. */
1521 if (m->m_pkthdr.rcvif == NULL) {
1522 /* XXX: is rcvif really NULL when output?? */
1523 mif6table[mifi].m6_pkt_out++;
1524 mif6table[mifi].m6_bytes_out += plen;
1525 } else {
1526 mif6table[mifi].m6_pkt_in++;
1527 mif6table[mifi].m6_bytes_in += plen;
1528 }
1529 rt->mf6c_pkt_cnt++;
1530 rt->mf6c_byte_cnt += plen;
1531
1532 /*
1533 * For each mif, forward a copy of the packet if there are group
1534 * members downstream on the interface.
1535 */
1536 src0 = ip6->ip6_src;
1537 dst0 = ip6->ip6_dst;
1538 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1539 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1540 V_ip6stat.ip6s_badscope++;
1541 return (error);
1542 }
1543 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1544 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1545 /*
1546 * check if the outgoing packet is going to break
1547 * a scope boundary.
1548 * XXX For packets through PIM register tunnel
1549 * interface, we believe a routing daemon.
1550 */
1551 if (!(mif6table[rt->mf6c_parent].m6_flags &
1552 MIFF_REGISTER) &&
1553 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1554 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1555 &oszone) ||
1556 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1557 &odzone) ||
1558 iszone != oszone ||
1559 idzone != odzone) {
1560 V_ip6stat.ip6s_badscope++;
1561 continue;
1562 }
1563 }
1564
1565 mifp->m6_pkt_out++;
1566 mifp->m6_bytes_out += plen;
1567 MC6_SEND(ip6, mifp, m);
1568 }
1569 }
1570 return (0);
1571}
1572
1573static void
1574phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1575{
1576 struct mbuf *mb_copy;
1577 struct ifnet *ifp = mifp->m6_ifp;
1578 int error = 0;
1579 struct sockaddr_in6 *dst6;
1580 u_long linkmtu;
1581
1582 dst6 = &mifp->m6_route.ro_dst;
1583
1584 /*
1585 * Make a new reference to the packet; make sure that
1586 * the IPv6 header is actually copied, not just referenced,
1587 * so that ip6_output() only scribbles on the copy.
1588 */
1589 mb_copy = m_copy(m, 0, M_COPYALL);
1590 if (mb_copy &&
1591 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1592 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1593 if (mb_copy == NULL) {
1594 return;
1595 }
1596 /* set MCAST flag to the outgoing packet */
1597 mb_copy->m_flags |= M_MCAST;
1598
1599 /*
1600 * If we sourced the packet, call ip6_output since we may devide
1601 * the packet into fragments when the packet is too big for the
1602 * outgoing interface.
1603 * Otherwise, we can simply send the packet to the interface
1604 * sending queue.
1605 */
1606 if (m->m_pkthdr.rcvif == NULL) {
1607 struct ip6_moptions im6o;
1608
1609 im6o.im6o_multicast_ifp = ifp;
1610 /* XXX: ip6_output will override ip6->ip6_hlim */
1611 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1612 im6o.im6o_multicast_loop = 1;
1613 error = ip6_output(mb_copy, NULL, &mifp->m6_route,
1614 IPV6_FORWARDING, &im6o, NULL, NULL);
1615
1616#ifdef MRT6DEBUG
1617 if (V_mrt6debug & DEBUG_XMIT)
1618 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1619 mifp - mif6table, error);
1620#endif
1621 return;
1622 }
1623
1624 /*
1625 * If configured to loop back multicasts by default,
1626 * loop back a copy now.
1627 */
1628 if (in6_mcast_loop) {
1629 dst6->sin6_len = sizeof(struct sockaddr_in6);
1630 dst6->sin6_family = AF_INET6;
1631 dst6->sin6_addr = ip6->ip6_dst;
1632 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst);
1633 }
1634
1635 /*
1636 * Put the packet into the sending queue of the outgoing interface
1637 * if it would fit in the MTU of the interface.
1638 */
1639 linkmtu = IN6_LINKMTU(ifp);
1640 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1641 dst6->sin6_len = sizeof(struct sockaddr_in6);
1642 dst6->sin6_family = AF_INET6;
1643 dst6->sin6_addr = ip6->ip6_dst;
1644 /*
1645 * We just call if_output instead of nd6_output here, since
1646 * we need no ND for a multicast forwarded packet...right?
1647 */
1648 error = (*ifp->if_output)(ifp, mb_copy,
1649 (struct sockaddr *)&mifp->m6_route.ro_dst, NULL);
1650#ifdef MRT6DEBUG
1651 if (V_mrt6debug & DEBUG_XMIT)
1652 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1653 mifp - mif6table, error);
1654#endif
1655 } else {
1656 /*
1657 * pMTU discovery is intentionally disabled by default, since
1658 * various router may notify pMTU in multicast, which can be
1659 * a DDoS to a router
1660 */
1661 if (V_ip6_mcast_pmtu)
1662 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1663 else {
1664#ifdef MRT6DEBUG
1665 if (V_mrt6debug & DEBUG_XMIT) {
1666 char ip6bufs[INET6_ADDRSTRLEN];
1667 char ip6bufd[INET6_ADDRSTRLEN];
1668 log(LOG_DEBUG,
1669 "phyint_send: packet too big on %s o %s "
1670 "g %s size %d(discarded)\n",
1671 if_name(ifp),
1672 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1673 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1674 mb_copy->m_pkthdr.len);
1675 }
1676#endif /* MRT6DEBUG */
1677 m_freem(mb_copy); /* simply discard the packet */
1678 }
1679 }
1680}
1681
1682static int
1683register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1684{
1685 struct mbuf *mm;
1686 int i, len = m->m_pkthdr.len;
1687 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1688 struct mrt6msg *im6;
1689
1690#ifdef MRT6DEBUG
1691 if (V_mrt6debug) {
1692 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1693 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1694 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1695 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1696 }
1697#endif
1698 ++pim6stat.pim6s_snd_registers;
1699
1700 /* Make a copy of the packet to send to the user level process */
1701 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1702 if (mm == NULL)
1703 return (ENOBUFS);
1704 mm->m_pkthdr.rcvif = NULL;
1705 mm->m_data += max_linkhdr;
1706 mm->m_len = sizeof(struct ip6_hdr);
1707
1708 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1709 m_freem(mm);
1710 return (ENOBUFS);
1711 }
1712 i = MHLEN - M_LEADINGSPACE(mm);
1713 if (i > len)
1714 i = len;
1715 mm = m_pullup(mm, i);
1716 if (mm == NULL)
1717 return (ENOBUFS);
1718/* TODO: check it! */
1719 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1720
1721 /*
1722 * Send message to routing daemon
1723 */
1724 sin6.sin6_addr = ip6->ip6_src;
1725
1726 im6 = mtod(mm, struct mrt6msg *);
1727 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1728 im6->im6_mbz = 0;
1729
1730 im6->im6_mif = mif - mif6table;
1731
1732 /* iif info is not given for reg. encap.n */
1733 mrt6stat.mrt6s_upcalls++;
1734
1735 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1736#ifdef MRT6DEBUG
1737 if (V_mrt6debug)
1738 log(LOG_WARNING,
1739 "register_send: ip6_mrouter socket queue full\n");
1740#endif
1741 ++mrt6stat.mrt6s_upq_sockfull;
1742 return (ENOBUFS);
1743 }
1744 return (0);
1745}
1746
1747/*
1748 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1749 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1750 * into the kernel.
1751 */
1752static int
1753pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1754{
1755
1756#ifdef DIAGNOSTIC
1757 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1758#endif
1759 if (proto != IPPROTO_PIM)
1760 return 0; /* not for us; reject the datagram. */
1761
1762 return 64; /* claim the datagram. */
1763}
1764
1765/*
1766 * PIM sparse mode hook
1767 * Receives the pim control messages, and passes them up to the listening
1768 * socket, using rip6_input.
1769 * The only message processed is the REGISTER pim message; the pim header
1770 * is stripped off, and the inner packet is passed to register_mforward.
1771 */
1772int
1773pim6_input(struct mbuf **mp, int *offp, int proto)
1774{
1775 struct pim *pim; /* pointer to a pim struct */
1776 struct ip6_hdr *ip6;
1777 int pimlen;
1778 struct mbuf *m = *mp;
1779 int minlen;
1780 int off = *offp;
1781
1782 ++pim6stat.pim6s_rcv_total;
1783
1784 ip6 = mtod(m, struct ip6_hdr *);
1785 pimlen = m->m_pkthdr.len - *offp;
1786
1787 /*
1788 * Validate lengths
1789 */
1790 if (pimlen < PIM_MINLEN) {
1791 ++pim6stat.pim6s_rcv_tooshort;
1792#ifdef MRT6DEBUG
1793 if (V_mrt6debug & DEBUG_PIM)
1794 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1795#endif
1796 m_freem(m);
1797 return (IPPROTO_DONE);
1798 }
1799
1800 /*
1801 * if the packet is at least as big as a REGISTER, go ahead
1802 * and grab the PIM REGISTER header size, to avoid another
1803 * possible m_pullup() later.
1804 *
1805 * PIM_MINLEN == pimhdr + u_int32 == 8
1806 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1807 */
1808 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1809
1810 /*
1811 * Make sure that the IP6 and PIM headers in contiguous memory, and
1812 * possibly the PIM REGISTER header
1813 */
1814#ifndef PULLDOWN_TEST
1815 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1816 /* adjust pointer */
1817 ip6 = mtod(m, struct ip6_hdr *);
1818
1819 /* adjust mbuf to point to the PIM header */
1820 pim = (struct pim *)((caddr_t)ip6 + off);
1821#else
1822 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1823 if (pim == NULL) {
1824 pim6stat.pim6s_rcv_tooshort++;
1825 return (IPPROTO_DONE);
1826 }
1827#endif
1828
1829#define PIM6_CHECKSUM
1830#ifdef PIM6_CHECKSUM
1831 {
1832 int cksumlen;
1833
1834 /*
1835 * Validate checksum.
1836 * If PIM REGISTER, exclude the data packet
1837 */
1838 if (pim->pim_type == PIM_REGISTER)
1839 cksumlen = PIM_MINLEN;
1840 else
1841 cksumlen = pimlen;
1842
1843 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1844 ++pim6stat.pim6s_rcv_badsum;
1845#ifdef MRT6DEBUG
1846 if (V_mrt6debug & DEBUG_PIM)
1847 log(LOG_DEBUG,
1848 "pim6_input: invalid checksum\n");
1849#endif
1850 m_freem(m);
1851 return (IPPROTO_DONE);
1852 }
1853 }
1854#endif /* PIM_CHECKSUM */
1855
1856 /* PIM version check */
1857 if (pim->pim_ver != PIM_VERSION) {
1858 ++pim6stat.pim6s_rcv_badversion;
1859#ifdef MRT6DEBUG
1860 log(LOG_ERR,
1861 "pim6_input: incorrect version %d, expecting %d\n",
1862 pim->pim_ver, PIM_VERSION);
1863#endif
1864 m_freem(m);
1865 return (IPPROTO_DONE);
1866 }
1867
1868 if (pim->pim_type == PIM_REGISTER) {
1869 /*
1870 * since this is a REGISTER, we'll make a copy of the register
1871 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1872 * routing daemon.
1873 */
1874 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1875
1876 struct mbuf *mcp;
1877 struct ip6_hdr *eip6;
1878 u_int32_t *reghdr;
1879 int rc;
1880#ifdef MRT6DEBUG
1881 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1882#endif
1883
1884 ++pim6stat.pim6s_rcv_registers;
1885
1886 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1887#ifdef MRT6DEBUG
1888 if (V_mrt6debug & DEBUG_PIM)
1889 log(LOG_DEBUG,
1890 "pim6_input: register mif not set: %d\n",
1891 reg_mif_num);
1892#endif
1893 m_freem(m);
1894 return (IPPROTO_DONE);
1895 }
1896
1897 reghdr = (u_int32_t *)(pim + 1);
1898
1899 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1900 goto pim6_input_to_daemon;
1901
1902 /*
1903 * Validate length
1904 */
1905 if (pimlen < PIM6_REG_MINLEN) {
1906 ++pim6stat.pim6s_rcv_tooshort;
1907 ++pim6stat.pim6s_rcv_badregisters;
1908#ifdef MRT6DEBUG
1909 log(LOG_ERR,
1910 "pim6_input: register packet size too "
1911 "small %d from %s\n",
1912 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1913#endif
1914 m_freem(m);
1915 return (IPPROTO_DONE);
1916 }
1917
1918 eip6 = (struct ip6_hdr *) (reghdr + 1);
1919#ifdef MRT6DEBUG
1920 if (V_mrt6debug & DEBUG_PIM)
1921 log(LOG_DEBUG,
1922 "pim6_input[register], eip6: %s -> %s, "
1923 "eip6 plen %d\n",
1924 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1925 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1926 ntohs(eip6->ip6_plen));
1927#endif
1928
1929 /* verify the version number of the inner packet */
1930 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1931 ++pim6stat.pim6s_rcv_badregisters;
1932#ifdef MRT6DEBUG
1933 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1934 "of the inner packet\n",
1935 (eip6->ip6_vfc & IPV6_VERSION));
1936#endif
1937 m_freem(m);
1938 return (IPPROTO_NONE);
1939 }
1940
1941 /* verify the inner packet is destined to a mcast group */
1942 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1943 ++pim6stat.pim6s_rcv_badregisters;
1944#ifdef MRT6DEBUG
1945 if (V_mrt6debug & DEBUG_PIM)
1946 log(LOG_DEBUG,
1947 "pim6_input: inner packet of register "
1948 "is not multicast %s\n",
1949 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1950#endif
1951 m_freem(m);
1952 return (IPPROTO_DONE);
1953 }
1954
1955 /*
1956 * make a copy of the whole header to pass to the daemon later.
1957 */
1958 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1959 if (mcp == NULL) {
1960#ifdef MRT6DEBUG
1961 log(LOG_ERR,
1962 "pim6_input: pim register: "
1963 "could not copy register head\n");
1964#endif
1965 m_freem(m);
1966 return (IPPROTO_DONE);
1967 }
1968
1969 /*
1970 * forward the inner ip6 packet; point m_data at the inner ip6.
1971 */
1972 m_adj(m, off + PIM_MINLEN);
1973#ifdef MRT6DEBUG
1974 if (V_mrt6debug & DEBUG_PIM) {
1975 log(LOG_DEBUG,
1976 "pim6_input: forwarding decapsulated register: "
1977 "src %s, dst %s, mif %d\n",
1978 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1979 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1980 reg_mif_num);
1981 }
1982#endif
1983
1984 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1985 dst.sin6_family, 0);
1986
1987 /* prepare the register head to send to the mrouting daemon */
1988 m = mcp;
1989 }
1990
1991 /*
1992 * Pass the PIM message up to the daemon; if it is a register message
1993 * pass the 'head' only up to the daemon. This includes the
1994 * encapsulator ip6 header, pim header, register header and the
1995 * encapsulated ip6 header.
1996 */
1997 pim6_input_to_daemon:
1998 rip6_input(&m, offp, proto);
1999 return (IPPROTO_DONE);
2000}
2001
2002static int
2003ip6_mroute_modevent(module_t mod, int type, void *unused)
2004{
2005
2006 switch (type) {
2007 case MOD_LOAD:
2008 MROUTER6_LOCK_INIT();
2009 MFC6_LOCK_INIT();
2010 MIF6_LOCK_INIT();
2011
2012 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
2013 pim6_encapcheck,
2014 (const struct protosw *)&in6_pim_protosw, NULL);
2015 if (pim6_encap_cookie == NULL) {
2016 printf("ip6_mroute: unable to attach pim6 encap\n");
2017 MIF6_LOCK_DESTROY();
2018 MFC6_LOCK_DESTROY();
2019 MROUTER6_LOCK_DESTROY();
2020 return (EINVAL);
2021 }
2022
2023 ip6_mforward = X_ip6_mforward;
2024 ip6_mrouter_done = X_ip6_mrouter_done;
2025 ip6_mrouter_get = X_ip6_mrouter_get;
2026 ip6_mrouter_set = X_ip6_mrouter_set;
2027 mrt6_ioctl = X_mrt6_ioctl;
2028 break;
2029
2030 case MOD_UNLOAD:
2031 if (V_ip6_mrouter != NULL)
2032 return EINVAL;
2033
2034 if (pim6_encap_cookie) {
2035 encap_detach(pim6_encap_cookie);
2036 pim6_encap_cookie = NULL;
2037 }
2038 X_ip6_mrouter_done();
2039 ip6_mforward = NULL;
2040 ip6_mrouter_done = NULL;
2041 ip6_mrouter_get = NULL;
2042 ip6_mrouter_set = NULL;
2043 mrt6_ioctl = NULL;
2044
2045 MIF6_LOCK_DESTROY();
2046 MFC6_LOCK_DESTROY();
2047 MROUTER6_LOCK_DESTROY();
2048 break;
2049
2050 default:
2051 return (EOPNOTSUPP);
2052 }
2053
2054 return (0);
2055}
2056
2057static moduledata_t ip6_mroutemod = {
2058 "ip6_mroute",
2059 ip6_mroute_modevent,
2060 0
2061};
2062
2063DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);