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: releng/10.0/sys/netinet6/ip6_mroute.c 256108 2013-10-07 12:07:40Z glebius $");
83
84 #include "opt_inet6.h"
85 #include "opt_kdtrace.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/sdt.h>
98 #include <sys/signalvar.h>
99 #include <sys/socket.h>
100 #include <sys/socketvar.h>
101 #include <sys/sockio.h>
102 #include <sys/sx.h>
103 #include <sys/sysctl.h>
104 #include <sys/syslog.h>
105 #include <sys/systm.h>
106 #include <sys/time.h>
107
108 #include <net/if.h>
109 #include <net/if_types.h>
110 #include <net/raw_cb.h>
111 #include <net/vnet.h>
112
113 #include <netinet/in.h>
114 #include <netinet/in_var.h>
115 #include <netinet/icmp6.h>
116 #include <netinet/ip_encap.h>
117
118 #include <netinet/ip6.h>
119 #include <netinet/in_kdtrace.h>
120 #include <netinet6/ip6_var.h>
121 #include <netinet6/scope6_var.h>
122 #include <netinet6/nd6.h>
123 #include <netinet6/ip6_mroute.h>
124 #include <netinet6/ip6protosw.h>
125 #include <netinet6/pim6.h>
126 #include <netinet6/pim6_var.h>
127
128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
129
130 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
131 #define M_HASCL(m) ((m)->m_flags & M_EXT)
132
133 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
134 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
135 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
136 static int set_pim6(int *);
137 static int socket_send(struct socket *, struct mbuf *,
138 struct sockaddr_in6 *);
139
140 extern int in6_mcast_loop;
141 extern struct domain inet6domain;
142
143 static const struct encaptab *pim6_encap_cookie;
144 static const struct ip6protosw in6_pim_protosw = {
145 .pr_type = SOCK_RAW,
146 .pr_domain = &inet6domain,
147 .pr_protocol = IPPROTO_PIM,
148 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
149 .pr_input = pim6_input,
150 .pr_output = rip6_output,
151 .pr_ctloutput = rip6_ctloutput,
152 .pr_usrreqs = &rip6_usrreqs
153 };
154 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
155
156 static VNET_DEFINE(int, ip6_mrouter_ver) = 0;
157 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
158
159 SYSCTL_DECL(_net_inet6);
160 SYSCTL_DECL(_net_inet6_ip6);
161 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
162
163 static struct mrt6stat mrt6stat;
164 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
165 &mrt6stat, mrt6stat,
166 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
167
168 #define MRT6STAT_INC(name) mrt6stat.name += 1
169 #define NO_RTE_FOUND 0x1
170 #define RTE_FOUND 0x2
171
172 static struct mtx mrouter6_mtx;
173 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
174 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
175 #define MROUTER6_LOCK_ASSERT() do { \
176 mtx_assert(&mrouter6_mtx, MA_OWNED); \
177 NET_ASSERT_GIANT(); \
178 } while (0)
179 #define MROUTER6_LOCK_INIT() \
180 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
181 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
182
183 static struct mf6c *mf6ctable[MF6CTBLSIZ];
184 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
185 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
186 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
187 "netinet6/ip6_mroute.h)");
188
189 static struct mtx mfc6_mtx;
190 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
191 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
192 #define MFC6_LOCK_ASSERT() do { \
193 mtx_assert(&mfc6_mtx, MA_OWNED); \
194 NET_ASSERT_GIANT(); \
195 } while (0)
196 #define MFC6_LOCK_INIT() \
197 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
198 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
199
200 static u_char n6expire[MF6CTBLSIZ];
201
202 static struct mif6 mif6table[MAXMIFS];
203 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
204 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
205 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
206
207 static struct mtx mif6_mtx;
208 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
209 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
210 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
211 #define MIF6_LOCK_INIT() \
212 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
213 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
214
215 #ifdef MRT6DEBUG
216 static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */
217 #define V_mrt6debug VNET(mrt6debug)
218 #define DEBUG_MFC 0x02
219 #define DEBUG_FORWARD 0x04
220 #define DEBUG_EXPIRE 0x08
221 #define DEBUG_XMIT 0x10
222 #define DEBUG_REG 0x20
223 #define DEBUG_PIM 0x40
224 #endif
225
226 static void expire_upcalls(void *);
227 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
228 #define UPCALL_EXPIRE 6 /* number of timeouts */
229
230 /*
231 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
232 */
233
234 /*
235 * 'Interfaces' associated with decapsulator (so we can tell
236 * packets that went through it from ones that get reflected
237 * by a broken gateway). Different from IPv4 register_if,
238 * these interfaces are linked into the system ifnet list,
239 * because per-interface IPv6 statistics are maintained in
240 * ifp->if_afdata. But it does not have any routes point
241 * to them. I.e., packets can't be sent this way. They
242 * only exist as a placeholder for multicast source
243 * verification.
244 */
245 static struct ifnet *multicast_register_if6;
246
247 #define ENCAP_HOPS 64
248
249 /*
250 * Private variables.
251 */
252 static mifi_t nummifs = 0;
253 static mifi_t reg_mif_num = (mifi_t)-1;
254
255 static struct pim6stat pim6stat;
256 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
257 &pim6stat, pim6stat,
258 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
259
260 #define PIM6STAT_INC(name) pim6stat.name += 1
261 static VNET_DEFINE(int, pim6);
262 #define V_pim6 VNET(pim6)
263
264 /*
265 * Hash function for a source, group entry
266 */
267 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
268 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
269 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
270 (g).s6_addr32[2] ^ (g).s6_addr32[3])
271
272 /*
273 * Find a route for a given origin IPv6 address and Multicast group address.
274 */
275 #define MF6CFIND(o, g, rt) do { \
276 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
277 rt = NULL; \
278 MRT6STAT_INC(mrt6s_mfc_lookups); \
279 while (_rt) { \
280 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
281 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
282 (_rt->mf6c_stall == NULL)) { \
283 rt = _rt; \
284 break; \
285 } \
286 _rt = _rt->mf6c_next; \
287 } \
288 if (rt == NULL) { \
289 MRT6STAT_INC(mrt6s_mfc_misses); \
290 } \
291 } while (/*CONSTCOND*/ 0)
292
293 /*
294 * Macros to compute elapsed time efficiently
295 * Borrowed from Van Jacobson's scheduling code
296 * XXX: replace with timersub() ?
297 */
298 #define TV_DELTA(a, b, delta) do { \
299 int xxs; \
300 \
301 delta = (a).tv_usec - (b).tv_usec; \
302 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
303 switch (xxs) { \
304 case 2: \
305 delta += 1000000; \
306 /* FALLTHROUGH */ \
307 case 1: \
308 delta += 1000000; \
309 break; \
310 default: \
311 delta += (1000000 * xxs); \
312 } \
313 } \
314 } while (/*CONSTCOND*/ 0)
315
316 /* XXX: replace with timercmp(a, b, <) ? */
317 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
318 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
319
320 #ifdef UPCALL_TIMING
321 #define UPCALL_MAX 50
322 static u_long upcall_data[UPCALL_MAX + 1];
323 static void collate();
324 #endif /* UPCALL_TIMING */
325
326 static int ip6_mrouter_init(struct socket *, int, int);
327 static int add_m6fc(struct mf6cctl *);
328 static int add_m6if(struct mif6ctl *);
329 static int del_m6fc(struct mf6cctl *);
330 static int del_m6if(mifi_t *);
331 static int del_m6if_locked(mifi_t *);
332 static int get_mif6_cnt(struct sioc_mif_req6 *);
333 static int get_sg_cnt(struct sioc_sg_req6 *);
334
335 static struct callout expire_upcalls_ch;
336
337 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
338 int X_ip6_mrouter_done(void);
339 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
340 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
341 int X_mrt6_ioctl(u_long, caddr_t);
342
343 /*
344 * Handle MRT setsockopt commands to modify the multicast routing tables.
345 */
346 int
347 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
348 {
349 int error = 0;
350 int optval;
351 struct mif6ctl mifc;
352 struct mf6cctl mfcc;
353 mifi_t mifi;
354
355 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
356 return (EACCES);
357
358 switch (sopt->sopt_name) {
359 case MRT6_INIT:
360 #ifdef MRT6_OINIT
361 case MRT6_OINIT:
362 #endif
363 error = sooptcopyin(sopt, &optval, sizeof(optval),
364 sizeof(optval));
365 if (error)
366 break;
367 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
368 break;
369 case MRT6_DONE:
370 error = X_ip6_mrouter_done();
371 break;
372 case MRT6_ADD_MIF:
373 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
374 if (error)
375 break;
376 error = add_m6if(&mifc);
377 break;
378 case MRT6_ADD_MFC:
379 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
380 if (error)
381 break;
382 error = add_m6fc(&mfcc);
383 break;
384 case MRT6_DEL_MFC:
385 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
386 if (error)
387 break;
388 error = del_m6fc(&mfcc);
389 break;
390 case MRT6_DEL_MIF:
391 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
392 if (error)
393 break;
394 error = del_m6if(&mifi);
395 break;
396 case MRT6_PIM:
397 error = sooptcopyin(sopt, &optval, sizeof(optval),
398 sizeof(optval));
399 if (error)
400 break;
401 error = set_pim6(&optval);
402 break;
403 default:
404 error = EOPNOTSUPP;
405 break;
406 }
407
408 return (error);
409 }
410
411 /*
412 * Handle MRT getsockopt commands
413 */
414 int
415 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
416 {
417 int error = 0;
418
419 if (so != V_ip6_mrouter)
420 return (EACCES);
421
422 switch (sopt->sopt_name) {
423 case MRT6_PIM:
424 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
425 break;
426 }
427 return (error);
428 }
429
430 /*
431 * Handle ioctl commands to obtain information from the cache
432 */
433 int
434 X_mrt6_ioctl(u_long cmd, caddr_t data)
435 {
436 int ret;
437
438 ret = EINVAL;
439
440 switch (cmd) {
441 case SIOCGETSGCNT_IN6:
442 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
443 break;
444
445 case SIOCGETMIFCNT_IN6:
446 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
447 break;
448
449 default:
450 break;
451 }
452
453 return (ret);
454 }
455
456 /*
457 * returns the packet, byte, rpf-failure count for the source group provided
458 */
459 static int
460 get_sg_cnt(struct sioc_sg_req6 *req)
461 {
462 struct mf6c *rt;
463 int ret;
464
465 ret = 0;
466
467 MFC6_LOCK();
468
469 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
470 if (rt == NULL) {
471 ret = ESRCH;
472 } else {
473 req->pktcnt = rt->mf6c_pkt_cnt;
474 req->bytecnt = rt->mf6c_byte_cnt;
475 req->wrong_if = rt->mf6c_wrong_if;
476 }
477
478 MFC6_UNLOCK();
479
480 return (ret);
481 }
482
483 /*
484 * returns the input and output packet and byte counts on the mif provided
485 */
486 static int
487 get_mif6_cnt(struct sioc_mif_req6 *req)
488 {
489 mifi_t mifi;
490 int ret;
491
492 ret = 0;
493 mifi = req->mifi;
494
495 MIF6_LOCK();
496
497 if (mifi >= nummifs) {
498 ret = EINVAL;
499 } else {
500 req->icount = mif6table[mifi].m6_pkt_in;
501 req->ocount = mif6table[mifi].m6_pkt_out;
502 req->ibytes = mif6table[mifi].m6_bytes_in;
503 req->obytes = mif6table[mifi].m6_bytes_out;
504 }
505
506 MIF6_UNLOCK();
507
508 return (ret);
509 }
510
511 static int
512 set_pim6(int *i)
513 {
514 if ((*i != 1) && (*i != 0))
515 return (EINVAL);
516
517 V_pim6 = *i;
518
519 return (0);
520 }
521
522 /*
523 * Enable multicast routing
524 */
525 static int
526 ip6_mrouter_init(struct socket *so, int v, int cmd)
527 {
528
529 #ifdef MRT6DEBUG
530 if (V_mrt6debug)
531 log(LOG_DEBUG,
532 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
533 so->so_type, so->so_proto->pr_protocol);
534 #endif
535
536 if (so->so_type != SOCK_RAW ||
537 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
538 return (EOPNOTSUPP);
539
540 if (v != 1)
541 return (ENOPROTOOPT);
542
543 MROUTER6_LOCK();
544
545 if (V_ip6_mrouter != NULL) {
546 MROUTER6_UNLOCK();
547 return (EADDRINUSE);
548 }
549
550 V_ip6_mrouter = so;
551 V_ip6_mrouter_ver = cmd;
552
553 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
554 bzero((caddr_t)n6expire, sizeof(n6expire));
555
556 V_pim6 = 0;/* used for stubbing out/in pim stuff */
557
558 callout_init(&expire_upcalls_ch, 0);
559 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
560 expire_upcalls, NULL);
561
562 MROUTER6_UNLOCK();
563
564 #ifdef MRT6DEBUG
565 if (V_mrt6debug)
566 log(LOG_DEBUG, "ip6_mrouter_init\n");
567 #endif
568
569 return (0);
570 }
571
572 /*
573 * Disable IPv6 multicast forwarding.
574 */
575 int
576 X_ip6_mrouter_done(void)
577 {
578 mifi_t mifi;
579 u_long i;
580 struct mf6c *rt;
581 struct rtdetq *rte;
582
583 MROUTER6_LOCK();
584
585 if (V_ip6_mrouter == NULL) {
586 MROUTER6_UNLOCK();
587 return (EINVAL);
588 }
589
590 /*
591 * For each phyint in use, disable promiscuous reception of all IPv6
592 * multicasts.
593 */
594 for (mifi = 0; mifi < nummifs; mifi++) {
595 if (mif6table[mifi].m6_ifp &&
596 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
597 if_allmulti(mif6table[mifi].m6_ifp, 0);
598 }
599 }
600 bzero((caddr_t)mif6table, sizeof(mif6table));
601 nummifs = 0;
602
603 V_pim6 = 0; /* used to stub out/in pim specific code */
604
605 callout_stop(&expire_upcalls_ch);
606
607 /*
608 * Free all multicast forwarding cache entries.
609 */
610 MFC6_LOCK();
611 for (i = 0; i < MF6CTBLSIZ; i++) {
612 rt = mf6ctable[i];
613 while (rt) {
614 struct mf6c *frt;
615
616 for (rte = rt->mf6c_stall; rte != NULL; ) {
617 struct rtdetq *n = rte->next;
618
619 m_freem(rte->m);
620 free(rte, M_MRTABLE6);
621 rte = n;
622 }
623 frt = rt;
624 rt = rt->mf6c_next;
625 free(frt, M_MRTABLE6);
626 }
627 }
628 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
629 MFC6_UNLOCK();
630
631 /*
632 * Reset register interface
633 */
634 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
635 if_detach(multicast_register_if6);
636 if_free(multicast_register_if6);
637 reg_mif_num = (mifi_t)-1;
638 multicast_register_if6 = NULL;
639 }
640
641 V_ip6_mrouter = NULL;
642 V_ip6_mrouter_ver = 0;
643
644 MROUTER6_UNLOCK();
645
646 #ifdef MRT6DEBUG
647 if (V_mrt6debug)
648 log(LOG_DEBUG, "ip6_mrouter_done\n");
649 #endif
650
651 return (0);
652 }
653
654 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
655
656 /*
657 * Add a mif to the mif table
658 */
659 static int
660 add_m6if(struct mif6ctl *mifcp)
661 {
662 struct mif6 *mifp;
663 struct ifnet *ifp;
664 int error;
665
666 MIF6_LOCK();
667
668 if (mifcp->mif6c_mifi >= MAXMIFS) {
669 MIF6_UNLOCK();
670 return (EINVAL);
671 }
672 mifp = mif6table + mifcp->mif6c_mifi;
673 if (mifp->m6_ifp != NULL) {
674 MIF6_UNLOCK();
675 return (EADDRINUSE); /* XXX: is it appropriate? */
676 }
677 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
678 MIF6_UNLOCK();
679 return (ENXIO);
680 }
681
682 ifp = ifnet_byindex(mifcp->mif6c_pifi);
683
684 if (mifcp->mif6c_flags & MIFF_REGISTER) {
685 if (reg_mif_num == (mifi_t)-1) {
686 ifp = if_alloc(IFT_OTHER);
687
688 if_initname(ifp, "register_mif", 0);
689 ifp->if_flags |= IFF_LOOPBACK;
690 if_attach(ifp);
691 multicast_register_if6 = ifp;
692 reg_mif_num = mifcp->mif6c_mifi;
693 /*
694 * it is impossible to guess the ifindex of the
695 * register interface. So mif6c_pifi is automatically
696 * calculated.
697 */
698 mifcp->mif6c_pifi = ifp->if_index;
699 } else {
700 ifp = multicast_register_if6;
701 }
702 } else {
703 /* Make sure the interface supports multicast */
704 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
705 MIF6_UNLOCK();
706 return (EOPNOTSUPP);
707 }
708
709 error = if_allmulti(ifp, 1);
710 if (error) {
711 MIF6_UNLOCK();
712 return (error);
713 }
714 }
715
716 mifp->m6_flags = mifcp->mif6c_flags;
717 mifp->m6_ifp = ifp;
718
719 /* initialize per mif pkt counters */
720 mifp->m6_pkt_in = 0;
721 mifp->m6_pkt_out = 0;
722 mifp->m6_bytes_in = 0;
723 mifp->m6_bytes_out = 0;
724
725 /* Adjust nummifs up if the mifi is higher than nummifs */
726 if (nummifs <= mifcp->mif6c_mifi)
727 nummifs = mifcp->mif6c_mifi + 1;
728
729 MIF6_UNLOCK();
730
731 #ifdef MRT6DEBUG
732 if (V_mrt6debug)
733 log(LOG_DEBUG,
734 "add_mif #%d, phyint %s\n",
735 mifcp->mif6c_mifi,
736 ifp->if_xname);
737 #endif
738
739 return (0);
740 }
741
742 /*
743 * Delete a mif from the mif table
744 */
745 static int
746 del_m6if_locked(mifi_t *mifip)
747 {
748 struct mif6 *mifp = mif6table + *mifip;
749 mifi_t mifi;
750 struct ifnet *ifp;
751
752 MIF6_LOCK_ASSERT();
753
754 if (*mifip >= nummifs)
755 return (EINVAL);
756 if (mifp->m6_ifp == NULL)
757 return (EINVAL);
758
759 if (!(mifp->m6_flags & MIFF_REGISTER)) {
760 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
761 ifp = mifp->m6_ifp;
762 if_allmulti(ifp, 0);
763 } else {
764 if (reg_mif_num != (mifi_t)-1 &&
765 multicast_register_if6 != NULL) {
766 if_detach(multicast_register_if6);
767 if_free(multicast_register_if6);
768 reg_mif_num = (mifi_t)-1;
769 multicast_register_if6 = NULL;
770 }
771 }
772
773 bzero((caddr_t)mifp, sizeof(*mifp));
774
775 /* Adjust nummifs down */
776 for (mifi = nummifs; mifi > 0; mifi--)
777 if (mif6table[mifi - 1].m6_ifp)
778 break;
779 nummifs = mifi;
780
781 #ifdef MRT6DEBUG
782 if (V_mrt6debug)
783 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
784 #endif
785
786 return (0);
787 }
788
789 static int
790 del_m6if(mifi_t *mifip)
791 {
792 int cc;
793
794 MIF6_LOCK();
795 cc = del_m6if_locked(mifip);
796 MIF6_UNLOCK();
797
798 return (cc);
799 }
800
801 /*
802 * Add an mfc entry
803 */
804 static int
805 add_m6fc(struct mf6cctl *mfccp)
806 {
807 struct mf6c *rt;
808 u_long hash;
809 struct rtdetq *rte;
810 u_short nstl;
811 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
812
813 MFC6_LOCK();
814
815 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
816 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
817
818 /* If an entry already exists, just update the fields */
819 if (rt) {
820 #ifdef MRT6DEBUG
821 if (V_mrt6debug & DEBUG_MFC) {
822 log(LOG_DEBUG,
823 "add_m6fc no upcall h %d o %s g %s p %x\n",
824 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
825 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
826 mfccp->mf6cc_parent);
827 }
828 #endif
829
830 rt->mf6c_parent = mfccp->mf6cc_parent;
831 rt->mf6c_ifset = mfccp->mf6cc_ifset;
832
833 MFC6_UNLOCK();
834 return (0);
835 }
836
837 /*
838 * Find the entry for which the upcall was made and update
839 */
840 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
841 mfccp->mf6cc_mcastgrp.sin6_addr);
842 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
843 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
844 &mfccp->mf6cc_origin.sin6_addr) &&
845 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
846 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
847 (rt->mf6c_stall != NULL)) {
848
849 if (nstl++)
850 log(LOG_ERR,
851 "add_m6fc: %s o %s g %s p %x dbx %p\n",
852 "multiple kernel entries",
853 ip6_sprintf(ip6bufo,
854 &mfccp->mf6cc_origin.sin6_addr),
855 ip6_sprintf(ip6bufg,
856 &mfccp->mf6cc_mcastgrp.sin6_addr),
857 mfccp->mf6cc_parent, rt->mf6c_stall);
858
859 #ifdef MRT6DEBUG
860 if (V_mrt6debug & DEBUG_MFC)
861 log(LOG_DEBUG,
862 "add_m6fc o %s g %s p %x dbg %x\n",
863 ip6_sprintf(ip6bufo,
864 &mfccp->mf6cc_origin.sin6_addr),
865 ip6_sprintf(ip6bufg,
866 &mfccp->mf6cc_mcastgrp.sin6_addr),
867 mfccp->mf6cc_parent, rt->mf6c_stall);
868 #endif
869
870 rt->mf6c_origin = mfccp->mf6cc_origin;
871 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
872 rt->mf6c_parent = mfccp->mf6cc_parent;
873 rt->mf6c_ifset = mfccp->mf6cc_ifset;
874 /* initialize pkt counters per src-grp */
875 rt->mf6c_pkt_cnt = 0;
876 rt->mf6c_byte_cnt = 0;
877 rt->mf6c_wrong_if = 0;
878
879 rt->mf6c_expire = 0; /* Don't clean this guy up */
880 n6expire[hash]--;
881
882 /* free packets Qed at the end of this entry */
883 for (rte = rt->mf6c_stall; rte != NULL; ) {
884 struct rtdetq *n = rte->next;
885 ip6_mdq(rte->m, rte->ifp, rt);
886 m_freem(rte->m);
887 #ifdef UPCALL_TIMING
888 collate(&(rte->t));
889 #endif /* UPCALL_TIMING */
890 free(rte, M_MRTABLE6);
891 rte = n;
892 }
893 rt->mf6c_stall = NULL;
894 }
895 }
896
897 /*
898 * It is possible that an entry is being inserted without an upcall
899 */
900 if (nstl == 0) {
901 #ifdef MRT6DEBUG
902 if (V_mrt6debug & DEBUG_MFC)
903 log(LOG_DEBUG,
904 "add_mfc no upcall h %d o %s g %s p %x\n",
905 hash,
906 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
907 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
908 mfccp->mf6cc_parent);
909 #endif
910
911 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
912
913 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
914 &mfccp->mf6cc_origin.sin6_addr)&&
915 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
916 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
917
918 rt->mf6c_origin = mfccp->mf6cc_origin;
919 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
920 rt->mf6c_parent = mfccp->mf6cc_parent;
921 rt->mf6c_ifset = mfccp->mf6cc_ifset;
922 /* initialize pkt counters per src-grp */
923 rt->mf6c_pkt_cnt = 0;
924 rt->mf6c_byte_cnt = 0;
925 rt->mf6c_wrong_if = 0;
926
927 if (rt->mf6c_expire)
928 n6expire[hash]--;
929 rt->mf6c_expire = 0;
930 }
931 }
932 if (rt == NULL) {
933 /* no upcall, so make a new entry */
934 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
935 M_NOWAIT);
936 if (rt == NULL) {
937 MFC6_UNLOCK();
938 return (ENOBUFS);
939 }
940
941 /* insert new entry at head of hash chain */
942 rt->mf6c_origin = mfccp->mf6cc_origin;
943 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
944 rt->mf6c_parent = mfccp->mf6cc_parent;
945 rt->mf6c_ifset = mfccp->mf6cc_ifset;
946 /* initialize pkt counters per src-grp */
947 rt->mf6c_pkt_cnt = 0;
948 rt->mf6c_byte_cnt = 0;
949 rt->mf6c_wrong_if = 0;
950 rt->mf6c_expire = 0;
951 rt->mf6c_stall = NULL;
952
953 /* link into table */
954 rt->mf6c_next = mf6ctable[hash];
955 mf6ctable[hash] = rt;
956 }
957 }
958
959 MFC6_UNLOCK();
960 return (0);
961 }
962
963 #ifdef UPCALL_TIMING
964 /*
965 * collect delay statistics on the upcalls
966 */
967 static void
968 collate(struct timeval *t)
969 {
970 u_long d;
971 struct timeval tp;
972 u_long delta;
973
974 GET_TIME(tp);
975
976 if (TV_LT(*t, tp))
977 {
978 TV_DELTA(tp, *t, delta);
979
980 d = delta >> 10;
981 if (d > UPCALL_MAX)
982 d = UPCALL_MAX;
983
984 ++upcall_data[d];
985 }
986 }
987 #endif /* UPCALL_TIMING */
988
989 /*
990 * Delete an mfc entry
991 */
992 static int
993 del_m6fc(struct mf6cctl *mfccp)
994 {
995 struct sockaddr_in6 origin;
996 struct sockaddr_in6 mcastgrp;
997 struct mf6c *rt;
998 struct mf6c **nptr;
999 u_long hash;
1000
1001 origin = mfccp->mf6cc_origin;
1002 mcastgrp = mfccp->mf6cc_mcastgrp;
1003 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1004
1005 #ifdef MRT6DEBUG
1006 if (V_mrt6debug & DEBUG_MFC) {
1007 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1008 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
1009 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1010 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1011 }
1012 #endif
1013
1014 MFC6_LOCK();
1015
1016 nptr = &mf6ctable[hash];
1017 while ((rt = *nptr) != NULL) {
1018 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1019 &rt->mf6c_origin.sin6_addr) &&
1020 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1021 &rt->mf6c_mcastgrp.sin6_addr) &&
1022 rt->mf6c_stall == NULL)
1023 break;
1024
1025 nptr = &rt->mf6c_next;
1026 }
1027 if (rt == NULL) {
1028 MFC6_UNLOCK();
1029 return (EADDRNOTAVAIL);
1030 }
1031
1032 *nptr = rt->mf6c_next;
1033 free(rt, M_MRTABLE6);
1034
1035 MFC6_UNLOCK();
1036
1037 return (0);
1038 }
1039
1040 static int
1041 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1042 {
1043
1044 if (s) {
1045 if (sbappendaddr(&s->so_rcv,
1046 (struct sockaddr *)src,
1047 mm, (struct mbuf *)0) != 0) {
1048 sorwakeup(s);
1049 return (0);
1050 }
1051 }
1052 m_freem(mm);
1053 return (-1);
1054 }
1055
1056 /*
1057 * IPv6 multicast forwarding function. This function assumes that the packet
1058 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1059 * pointed to by "ifp", and the packet is to be relayed to other networks
1060 * that have members of the packet's destination IPv6 multicast group.
1061 *
1062 * The packet is returned unscathed to the caller, unless it is
1063 * erroneous, in which case a non-zero return value tells the caller to
1064 * discard it.
1065 *
1066 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1067 * this function is called in the originating context (i.e., not when
1068 * forwarding a packet from other node). ip6_output(), which is currently the
1069 * only function that calls this function is called in the originating context,
1070 * explicitly ensures this condition. It is caller's responsibility to ensure
1071 * that if this function is called from somewhere else in the originating
1072 * context in the future.
1073 */
1074 int
1075 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1076 {
1077 struct mf6c *rt;
1078 struct mif6 *mifp;
1079 struct mbuf *mm;
1080 mifi_t mifi;
1081 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1082
1083 #ifdef MRT6DEBUG
1084 if (V_mrt6debug & DEBUG_FORWARD)
1085 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
1086 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1087 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1088 ifp->if_index);
1089 #endif
1090
1091 /*
1092 * Don't forward a packet with Hop limit of zero or one,
1093 * or a packet destined to a local-only group.
1094 */
1095 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1096 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1097 return (0);
1098 ip6->ip6_hlim--;
1099
1100 /*
1101 * Source address check: do not forward packets with unspecified
1102 * source. It was discussed in July 2000, on ipngwg mailing list.
1103 * This is rather more serious than unicast cases, because some
1104 * MLD packets can be sent with the unspecified source address
1105 * (although such packets must normally set 1 to the hop limit field).
1106 */
1107 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1108 IP6STAT_INC(ip6s_cantforward);
1109 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1110 V_ip6_log_time = time_uptime;
1111 log(LOG_DEBUG,
1112 "cannot forward "
1113 "from %s to %s nxt %d received on %s\n",
1114 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1115 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1116 ip6->ip6_nxt,
1117 if_name(m->m_pkthdr.rcvif));
1118 }
1119 return (0);
1120 }
1121
1122 MFC6_LOCK();
1123
1124 /*
1125 * Determine forwarding mifs from the forwarding cache table
1126 */
1127 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1128
1129 /* Entry exists, so forward if necessary */
1130 if (rt) {
1131 MFC6_UNLOCK();
1132 return (ip6_mdq(m, ifp, rt));
1133 } else {
1134 /*
1135 * If we don't have a route for packet's origin,
1136 * Make a copy of the packet &
1137 * send message to routing daemon
1138 */
1139
1140 struct mbuf *mb0;
1141 struct rtdetq *rte;
1142 u_long hash;
1143 /* int i, npkts;*/
1144 #ifdef UPCALL_TIMING
1145 struct timeval tp;
1146
1147 GET_TIME(tp);
1148 #endif /* UPCALL_TIMING */
1149
1150 MRT6STAT_INC(mrt6s_no_route);
1151 #ifdef MRT6DEBUG
1152 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1153 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1154 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1155 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1156 #endif
1157
1158 /*
1159 * Allocate mbufs early so that we don't do extra work if we
1160 * are just going to fail anyway.
1161 */
1162 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
1163 M_NOWAIT);
1164 if (rte == NULL) {
1165 MFC6_UNLOCK();
1166 return (ENOBUFS);
1167 }
1168 mb0 = m_copy(m, 0, M_COPYALL);
1169 /*
1170 * Pullup packet header if needed before storing it,
1171 * as other references may modify it in the meantime.
1172 */
1173 if (mb0 &&
1174 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1175 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1176 if (mb0 == NULL) {
1177 free(rte, M_MRTABLE6);
1178 MFC6_UNLOCK();
1179 return (ENOBUFS);
1180 }
1181
1182 /* is there an upcall waiting for this packet? */
1183 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1184 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1185 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1186 &rt->mf6c_origin.sin6_addr) &&
1187 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1188 &rt->mf6c_mcastgrp.sin6_addr) &&
1189 (rt->mf6c_stall != NULL))
1190 break;
1191 }
1192
1193 if (rt == NULL) {
1194 struct mrt6msg *im;
1195 #ifdef MRT6_OINIT
1196 struct omrt6msg *oim;
1197 #endif
1198
1199 /* no upcall, so make a new entry */
1200 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
1201 M_NOWAIT);
1202 if (rt == NULL) {
1203 free(rte, M_MRTABLE6);
1204 m_freem(mb0);
1205 MFC6_UNLOCK();
1206 return (ENOBUFS);
1207 }
1208 /*
1209 * Make a copy of the header to send to the user
1210 * level process
1211 */
1212 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1213
1214 if (mm == NULL) {
1215 free(rte, M_MRTABLE6);
1216 m_freem(mb0);
1217 free(rt, M_MRTABLE6);
1218 MFC6_UNLOCK();
1219 return (ENOBUFS);
1220 }
1221
1222 /*
1223 * Send message to routing daemon
1224 */
1225 sin6.sin6_addr = ip6->ip6_src;
1226
1227 im = NULL;
1228 #ifdef MRT6_OINIT
1229 oim = NULL;
1230 #endif
1231 switch (V_ip6_mrouter_ver) {
1232 #ifdef MRT6_OINIT
1233 case MRT6_OINIT:
1234 oim = mtod(mm, struct omrt6msg *);
1235 oim->im6_msgtype = MRT6MSG_NOCACHE;
1236 oim->im6_mbz = 0;
1237 break;
1238 #endif
1239 case MRT6_INIT:
1240 im = mtod(mm, struct mrt6msg *);
1241 im->im6_msgtype = MRT6MSG_NOCACHE;
1242 im->im6_mbz = 0;
1243 break;
1244 default:
1245 free(rte, M_MRTABLE6);
1246 m_freem(mb0);
1247 free(rt, M_MRTABLE6);
1248 MFC6_UNLOCK();
1249 return (EINVAL);
1250 }
1251
1252 #ifdef MRT6DEBUG
1253 if (V_mrt6debug & DEBUG_FORWARD)
1254 log(LOG_DEBUG,
1255 "getting the iif info in the kernel\n");
1256 #endif
1257
1258 for (mifp = mif6table, mifi = 0;
1259 mifi < nummifs && mifp->m6_ifp != ifp;
1260 mifp++, mifi++)
1261 ;
1262
1263 switch (V_ip6_mrouter_ver) {
1264 #ifdef MRT6_OINIT
1265 case MRT6_OINIT:
1266 oim->im6_mif = mifi;
1267 break;
1268 #endif
1269 case MRT6_INIT:
1270 im->im6_mif = mifi;
1271 break;
1272 }
1273
1274 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1275 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1276 "socket queue full\n");
1277 MRT6STAT_INC(mrt6s_upq_sockfull);
1278 free(rte, M_MRTABLE6);
1279 m_freem(mb0);
1280 free(rt, M_MRTABLE6);
1281 MFC6_UNLOCK();
1282 return (ENOBUFS);
1283 }
1284
1285 MRT6STAT_INC(mrt6s_upcalls);
1286
1287 /* insert new entry at head of hash chain */
1288 bzero(rt, sizeof(*rt));
1289 rt->mf6c_origin.sin6_family = AF_INET6;
1290 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1291 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1292 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1293 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1294 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1295 rt->mf6c_expire = UPCALL_EXPIRE;
1296 n6expire[hash]++;
1297 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1298
1299 /* link into table */
1300 rt->mf6c_next = mf6ctable[hash];
1301 mf6ctable[hash] = rt;
1302 /* Add this entry to the end of the queue */
1303 rt->mf6c_stall = rte;
1304 } else {
1305 /* determine if q has overflowed */
1306 struct rtdetq **p;
1307 int npkts = 0;
1308
1309 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1310 if (++npkts > MAX_UPQ6) {
1311 MRT6STAT_INC(mrt6s_upq_ovflw);
1312 free(rte, M_MRTABLE6);
1313 m_freem(mb0);
1314 MFC6_UNLOCK();
1315 return (0);
1316 }
1317
1318 /* Add this entry to the end of the queue */
1319 *p = rte;
1320 }
1321
1322 rte->next = NULL;
1323 rte->m = mb0;
1324 rte->ifp = ifp;
1325 #ifdef UPCALL_TIMING
1326 rte->t = tp;
1327 #endif /* UPCALL_TIMING */
1328
1329 MFC6_UNLOCK();
1330
1331 return (0);
1332 }
1333 }
1334
1335 /*
1336 * Clean up cache entries if upcalls are not serviced
1337 * Call from the Slow Timeout mechanism, every half second.
1338 */
1339 static void
1340 expire_upcalls(void *unused)
1341 {
1342 struct rtdetq *rte;
1343 struct mf6c *mfc, **nptr;
1344 u_long i;
1345
1346 MFC6_LOCK();
1347 for (i = 0; i < MF6CTBLSIZ; i++) {
1348 if (n6expire[i] == 0)
1349 continue;
1350 nptr = &mf6ctable[i];
1351 while ((mfc = *nptr) != NULL) {
1352 rte = mfc->mf6c_stall;
1353 /*
1354 * Skip real cache entries
1355 * Make sure it wasn't marked to not expire (shouldn't happen)
1356 * If it expires now
1357 */
1358 if (rte != NULL &&
1359 mfc->mf6c_expire != 0 &&
1360 --mfc->mf6c_expire == 0) {
1361 #ifdef MRT6DEBUG
1362 if (V_mrt6debug & DEBUG_EXPIRE) {
1363 char ip6bufo[INET6_ADDRSTRLEN];
1364 char ip6bufg[INET6_ADDRSTRLEN];
1365 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1366 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1367 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1368 }
1369 #endif
1370 /*
1371 * drop all the packets
1372 * free the mbuf with the pkt, if, timing info
1373 */
1374 do {
1375 struct rtdetq *n = rte->next;
1376 m_freem(rte->m);
1377 free(rte, M_MRTABLE6);
1378 rte = n;
1379 } while (rte != NULL);
1380 MRT6STAT_INC(mrt6s_cache_cleanups);
1381 n6expire[i]--;
1382
1383 *nptr = mfc->mf6c_next;
1384 free(mfc, M_MRTABLE6);
1385 } else {
1386 nptr = &mfc->mf6c_next;
1387 }
1388 }
1389 }
1390 MFC6_UNLOCK();
1391 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1392 expire_upcalls, NULL);
1393 }
1394
1395 /*
1396 * Packet forwarding routine once entry in the cache is made
1397 */
1398 static int
1399 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1400 {
1401 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1402 mifi_t mifi, iif;
1403 struct mif6 *mifp;
1404 int plen = m->m_pkthdr.len;
1405 struct in6_addr src0, dst0; /* copies for local work */
1406 u_int32_t iszone, idzone, oszone, odzone;
1407 int error = 0;
1408
1409 /*
1410 * Macro to send packet on mif. Since RSVP packets don't get counted on
1411 * input, they shouldn't get counted on output, so statistics keeping is
1412 * separate.
1413 */
1414
1415 #define MC6_SEND(ip6, mifp, m) do { \
1416 if ((mifp)->m6_flags & MIFF_REGISTER) \
1417 register_send((ip6), (mifp), (m)); \
1418 else \
1419 phyint_send((ip6), (mifp), (m)); \
1420 } while (/*CONSTCOND*/ 0)
1421
1422 /*
1423 * Don't forward if it didn't arrive from the parent mif
1424 * for its origin.
1425 */
1426 mifi = rt->mf6c_parent;
1427 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1428 /* came in the wrong interface */
1429 #ifdef MRT6DEBUG
1430 if (V_mrt6debug & DEBUG_FORWARD)
1431 log(LOG_DEBUG,
1432 "wrong if: ifid %d mifi %d mififid %x\n",
1433 ifp->if_index, mifi,
1434 mif6table[mifi].m6_ifp->if_index);
1435 #endif
1436 MRT6STAT_INC(mrt6s_wrong_if);
1437 rt->mf6c_wrong_if++;
1438 /*
1439 * If we are doing PIM processing, and we are forwarding
1440 * packets on this interface, send a message to the
1441 * routing daemon.
1442 */
1443 /* have to make sure this is a valid mif */
1444 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1445 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1446 /*
1447 * Check the M_LOOP flag to avoid an
1448 * unnecessary PIM assert.
1449 * XXX: M_LOOP is an ad-hoc hack...
1450 */
1451 static struct sockaddr_in6 sin6 =
1452 { sizeof(sin6), AF_INET6 };
1453
1454 struct mbuf *mm;
1455 struct mrt6msg *im;
1456 #ifdef MRT6_OINIT
1457 struct omrt6msg *oim;
1458 #endif
1459
1460 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1461 if (mm &&
1462 (M_HASCL(mm) ||
1463 mm->m_len < sizeof(struct ip6_hdr)))
1464 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1465 if (mm == NULL)
1466 return (ENOBUFS);
1467
1468 #ifdef MRT6_OINIT
1469 oim = NULL;
1470 #endif
1471 im = NULL;
1472 switch (V_ip6_mrouter_ver) {
1473 #ifdef MRT6_OINIT
1474 case MRT6_OINIT:
1475 oim = mtod(mm, struct omrt6msg *);
1476 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1477 oim->im6_mbz = 0;
1478 break;
1479 #endif
1480 case MRT6_INIT:
1481 im = mtod(mm, struct mrt6msg *);
1482 im->im6_msgtype = MRT6MSG_WRONGMIF;
1483 im->im6_mbz = 0;
1484 break;
1485 default:
1486 m_freem(mm);
1487 return (EINVAL);
1488 }
1489
1490 for (mifp = mif6table, iif = 0;
1491 iif < nummifs && mifp &&
1492 mifp->m6_ifp != ifp;
1493 mifp++, iif++)
1494 ;
1495
1496 switch (V_ip6_mrouter_ver) {
1497 #ifdef MRT6_OINIT
1498 case MRT6_OINIT:
1499 oim->im6_mif = iif;
1500 sin6.sin6_addr = oim->im6_src;
1501 break;
1502 #endif
1503 case MRT6_INIT:
1504 im->im6_mif = iif;
1505 sin6.sin6_addr = im->im6_src;
1506 break;
1507 }
1508
1509 MRT6STAT_INC(mrt6s_upcalls);
1510
1511 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1512 #ifdef MRT6DEBUG
1513 if (V_mrt6debug)
1514 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1515 #endif
1516 MRT6STAT_INC(mrt6s_upq_sockfull);
1517 return (ENOBUFS);
1518 } /* if socket Q full */
1519 } /* if PIM */
1520 return (0);
1521 } /* if wrong iif */
1522
1523 /* If I sourced this packet, it counts as output, else it was input. */
1524 if (m->m_pkthdr.rcvif == NULL) {
1525 /* XXX: is rcvif really NULL when output?? */
1526 mif6table[mifi].m6_pkt_out++;
1527 mif6table[mifi].m6_bytes_out += plen;
1528 } else {
1529 mif6table[mifi].m6_pkt_in++;
1530 mif6table[mifi].m6_bytes_in += plen;
1531 }
1532 rt->mf6c_pkt_cnt++;
1533 rt->mf6c_byte_cnt += plen;
1534
1535 /*
1536 * For each mif, forward a copy of the packet if there are group
1537 * members downstream on the interface.
1538 */
1539 src0 = ip6->ip6_src;
1540 dst0 = ip6->ip6_dst;
1541 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1542 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1543 IP6STAT_INC(ip6s_badscope);
1544 return (error);
1545 }
1546 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1547 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1548 /*
1549 * check if the outgoing packet is going to break
1550 * a scope boundary.
1551 * XXX For packets through PIM register tunnel
1552 * interface, we believe a routing daemon.
1553 */
1554 if (!(mif6table[rt->mf6c_parent].m6_flags &
1555 MIFF_REGISTER) &&
1556 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1557 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1558 &oszone) ||
1559 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1560 &odzone) ||
1561 iszone != oszone ||
1562 idzone != odzone) {
1563 IP6STAT_INC(ip6s_badscope);
1564 continue;
1565 }
1566 }
1567
1568 mifp->m6_pkt_out++;
1569 mifp->m6_bytes_out += plen;
1570 MC6_SEND(ip6, mifp, m);
1571 }
1572 }
1573 return (0);
1574 }
1575
1576 static void
1577 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1578 {
1579 struct mbuf *mb_copy;
1580 struct ifnet *ifp = mifp->m6_ifp;
1581 int error = 0;
1582 u_long linkmtu;
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, NULL, IPV6_FORWARDING, &im6o,
1614 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 struct sockaddr_in6 dst6;
1630
1631 bzero(&dst6, sizeof(dst6));
1632 dst6.sin6_len = sizeof(struct sockaddr_in6);
1633 dst6.sin6_family = AF_INET6;
1634 dst6.sin6_addr = ip6->ip6_dst;
1635 ip6_mloopback(ifp, m, &dst6);
1636 }
1637
1638 /*
1639 * Put the packet into the sending queue of the outgoing interface
1640 * if it would fit in the MTU of the interface.
1641 */
1642 linkmtu = IN6_LINKMTU(ifp);
1643 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1644 struct sockaddr_in6 dst6;
1645
1646 bzero(&dst6, sizeof(dst6));
1647 dst6.sin6_len = sizeof(struct sockaddr_in6);
1648 dst6.sin6_family = AF_INET6;
1649 dst6.sin6_addr = ip6->ip6_dst;
1650
1651 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1652 /*
1653 * We just call if_output instead of nd6_output here, since
1654 * we need no ND for a multicast forwarded packet...right?
1655 */
1656 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1657 error = (*ifp->if_output)(ifp, mb_copy,
1658 (struct sockaddr *)&dst6, NULL);
1659 #ifdef MRT6DEBUG
1660 if (V_mrt6debug & DEBUG_XMIT)
1661 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1662 mifp - mif6table, error);
1663 #endif
1664 } else {
1665 /*
1666 * pMTU discovery is intentionally disabled by default, since
1667 * various router may notify pMTU in multicast, which can be
1668 * a DDoS to a router
1669 */
1670 if (V_ip6_mcast_pmtu)
1671 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1672 else {
1673 #ifdef MRT6DEBUG
1674 if (V_mrt6debug & DEBUG_XMIT) {
1675 char ip6bufs[INET6_ADDRSTRLEN];
1676 char ip6bufd[INET6_ADDRSTRLEN];
1677 log(LOG_DEBUG,
1678 "phyint_send: packet too big on %s o %s "
1679 "g %s size %d(discarded)\n",
1680 if_name(ifp),
1681 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1682 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1683 mb_copy->m_pkthdr.len);
1684 }
1685 #endif /* MRT6DEBUG */
1686 m_freem(mb_copy); /* simply discard the packet */
1687 }
1688 }
1689 }
1690
1691 static int
1692 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1693 {
1694 struct mbuf *mm;
1695 int i, len = m->m_pkthdr.len;
1696 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1697 struct mrt6msg *im6;
1698
1699 #ifdef MRT6DEBUG
1700 if (V_mrt6debug) {
1701 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1702 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1703 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1704 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1705 }
1706 #endif
1707 PIM6STAT_INC(pim6s_snd_registers);
1708
1709 /* Make a copy of the packet to send to the user level process. */
1710 mm = m_gethdr(M_NOWAIT, MT_DATA);
1711 if (mm == NULL)
1712 return (ENOBUFS);
1713 mm->m_data += max_linkhdr;
1714 mm->m_len = sizeof(struct ip6_hdr);
1715
1716 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1717 m_freem(mm);
1718 return (ENOBUFS);
1719 }
1720 i = MHLEN - M_LEADINGSPACE(mm);
1721 if (i > len)
1722 i = len;
1723 mm = m_pullup(mm, i);
1724 if (mm == NULL)
1725 return (ENOBUFS);
1726 /* TODO: check it! */
1727 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1728
1729 /*
1730 * Send message to routing daemon
1731 */
1732 sin6.sin6_addr = ip6->ip6_src;
1733
1734 im6 = mtod(mm, struct mrt6msg *);
1735 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1736 im6->im6_mbz = 0;
1737
1738 im6->im6_mif = mif - mif6table;
1739
1740 /* iif info is not given for reg. encap.n */
1741 MRT6STAT_INC(mrt6s_upcalls);
1742
1743 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1744 #ifdef MRT6DEBUG
1745 if (V_mrt6debug)
1746 log(LOG_WARNING,
1747 "register_send: ip6_mrouter socket queue full\n");
1748 #endif
1749 MRT6STAT_INC(mrt6s_upq_sockfull);
1750 return (ENOBUFS);
1751 }
1752 return (0);
1753 }
1754
1755 /*
1756 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1757 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1758 * into the kernel.
1759 */
1760 static int
1761 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1762 {
1763
1764 #ifdef DIAGNOSTIC
1765 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1766 #endif
1767 if (proto != IPPROTO_PIM)
1768 return 0; /* not for us; reject the datagram. */
1769
1770 return 64; /* claim the datagram. */
1771 }
1772
1773 /*
1774 * PIM sparse mode hook
1775 * Receives the pim control messages, and passes them up to the listening
1776 * socket, using rip6_input.
1777 * The only message processed is the REGISTER pim message; the pim header
1778 * is stripped off, and the inner packet is passed to register_mforward.
1779 */
1780 int
1781 pim6_input(struct mbuf **mp, int *offp, int proto)
1782 {
1783 struct pim *pim; /* pointer to a pim struct */
1784 struct ip6_hdr *ip6;
1785 int pimlen;
1786 struct mbuf *m = *mp;
1787 int minlen;
1788 int off = *offp;
1789
1790 PIM6STAT_INC(pim6s_rcv_total);
1791
1792 ip6 = mtod(m, struct ip6_hdr *);
1793 pimlen = m->m_pkthdr.len - *offp;
1794
1795 /*
1796 * Validate lengths
1797 */
1798 if (pimlen < PIM_MINLEN) {
1799 PIM6STAT_INC(pim6s_rcv_tooshort);
1800 #ifdef MRT6DEBUG
1801 if (V_mrt6debug & DEBUG_PIM)
1802 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1803 #endif
1804 m_freem(m);
1805 return (IPPROTO_DONE);
1806 }
1807
1808 /*
1809 * if the packet is at least as big as a REGISTER, go ahead
1810 * and grab the PIM REGISTER header size, to avoid another
1811 * possible m_pullup() later.
1812 *
1813 * PIM_MINLEN == pimhdr + u_int32 == 8
1814 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1815 */
1816 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1817
1818 /*
1819 * Make sure that the IP6 and PIM headers in contiguous memory, and
1820 * possibly the PIM REGISTER header
1821 */
1822 #ifndef PULLDOWN_TEST
1823 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1824 /* adjust pointer */
1825 ip6 = mtod(m, struct ip6_hdr *);
1826
1827 /* adjust mbuf to point to the PIM header */
1828 pim = (struct pim *)((caddr_t)ip6 + off);
1829 #else
1830 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1831 if (pim == NULL) {
1832 PIM6STAT_INC(pim6s_rcv_tooshort);
1833 return (IPPROTO_DONE);
1834 }
1835 #endif
1836
1837 #define PIM6_CHECKSUM
1838 #ifdef PIM6_CHECKSUM
1839 {
1840 int cksumlen;
1841
1842 /*
1843 * Validate checksum.
1844 * If PIM REGISTER, exclude the data packet
1845 */
1846 if (pim->pim_type == PIM_REGISTER)
1847 cksumlen = PIM_MINLEN;
1848 else
1849 cksumlen = pimlen;
1850
1851 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1852 PIM6STAT_INC(pim6s_rcv_badsum);
1853 #ifdef MRT6DEBUG
1854 if (V_mrt6debug & DEBUG_PIM)
1855 log(LOG_DEBUG,
1856 "pim6_input: invalid checksum\n");
1857 #endif
1858 m_freem(m);
1859 return (IPPROTO_DONE);
1860 }
1861 }
1862 #endif /* PIM_CHECKSUM */
1863
1864 /* PIM version check */
1865 if (pim->pim_ver != PIM_VERSION) {
1866 PIM6STAT_INC(pim6s_rcv_badversion);
1867 #ifdef MRT6DEBUG
1868 log(LOG_ERR,
1869 "pim6_input: incorrect version %d, expecting %d\n",
1870 pim->pim_ver, PIM_VERSION);
1871 #endif
1872 m_freem(m);
1873 return (IPPROTO_DONE);
1874 }
1875
1876 if (pim->pim_type == PIM_REGISTER) {
1877 /*
1878 * since this is a REGISTER, we'll make a copy of the register
1879 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1880 * routing daemon.
1881 */
1882 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1883
1884 struct mbuf *mcp;
1885 struct ip6_hdr *eip6;
1886 u_int32_t *reghdr;
1887 int rc;
1888 #ifdef MRT6DEBUG
1889 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1890 #endif
1891
1892 PIM6STAT_INC(pim6s_rcv_registers);
1893
1894 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1895 #ifdef MRT6DEBUG
1896 if (V_mrt6debug & DEBUG_PIM)
1897 log(LOG_DEBUG,
1898 "pim6_input: register mif not set: %d\n",
1899 reg_mif_num);
1900 #endif
1901 m_freem(m);
1902 return (IPPROTO_DONE);
1903 }
1904
1905 reghdr = (u_int32_t *)(pim + 1);
1906
1907 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1908 goto pim6_input_to_daemon;
1909
1910 /*
1911 * Validate length
1912 */
1913 if (pimlen < PIM6_REG_MINLEN) {
1914 PIM6STAT_INC(pim6s_rcv_tooshort);
1915 PIM6STAT_INC(pim6s_rcv_badregisters);
1916 #ifdef MRT6DEBUG
1917 log(LOG_ERR,
1918 "pim6_input: register packet size too "
1919 "small %d from %s\n",
1920 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1921 #endif
1922 m_freem(m);
1923 return (IPPROTO_DONE);
1924 }
1925
1926 eip6 = (struct ip6_hdr *) (reghdr + 1);
1927 #ifdef MRT6DEBUG
1928 if (V_mrt6debug & DEBUG_PIM)
1929 log(LOG_DEBUG,
1930 "pim6_input[register], eip6: %s -> %s, "
1931 "eip6 plen %d\n",
1932 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1933 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1934 ntohs(eip6->ip6_plen));
1935 #endif
1936
1937 /* verify the version number of the inner packet */
1938 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1939 PIM6STAT_INC(pim6s_rcv_badregisters);
1940 #ifdef MRT6DEBUG
1941 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1942 "of the inner packet\n",
1943 (eip6->ip6_vfc & IPV6_VERSION));
1944 #endif
1945 m_freem(m);
1946 return (IPPROTO_NONE);
1947 }
1948
1949 /* verify the inner packet is destined to a mcast group */
1950 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1951 PIM6STAT_INC(pim6s_rcv_badregisters);
1952 #ifdef MRT6DEBUG
1953 if (V_mrt6debug & DEBUG_PIM)
1954 log(LOG_DEBUG,
1955 "pim6_input: inner packet of register "
1956 "is not multicast %s\n",
1957 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1958 #endif
1959 m_freem(m);
1960 return (IPPROTO_DONE);
1961 }
1962
1963 /*
1964 * make a copy of the whole header to pass to the daemon later.
1965 */
1966 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1967 if (mcp == NULL) {
1968 #ifdef MRT6DEBUG
1969 log(LOG_ERR,
1970 "pim6_input: pim register: "
1971 "could not copy register head\n");
1972 #endif
1973 m_freem(m);
1974 return (IPPROTO_DONE);
1975 }
1976
1977 /*
1978 * forward the inner ip6 packet; point m_data at the inner ip6.
1979 */
1980 m_adj(m, off + PIM_MINLEN);
1981 #ifdef MRT6DEBUG
1982 if (V_mrt6debug & DEBUG_PIM) {
1983 log(LOG_DEBUG,
1984 "pim6_input: forwarding decapsulated register: "
1985 "src %s, dst %s, mif %d\n",
1986 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1987 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1988 reg_mif_num);
1989 }
1990 #endif
1991
1992 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1993 dst.sin6_family, 0);
1994
1995 /* prepare the register head to send to the mrouting daemon */
1996 m = mcp;
1997 }
1998
1999 /*
2000 * Pass the PIM message up to the daemon; if it is a register message
2001 * pass the 'head' only up to the daemon. This includes the
2002 * encapsulator ip6 header, pim header, register header and the
2003 * encapsulated ip6 header.
2004 */
2005 pim6_input_to_daemon:
2006 rip6_input(&m, offp, proto);
2007 return (IPPROTO_DONE);
2008 }
2009
2010 static int
2011 ip6_mroute_modevent(module_t mod, int type, void *unused)
2012 {
2013
2014 switch (type) {
2015 case MOD_LOAD:
2016 MROUTER6_LOCK_INIT();
2017 MFC6_LOCK_INIT();
2018 MIF6_LOCK_INIT();
2019
2020 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
2021 pim6_encapcheck,
2022 (const struct protosw *)&in6_pim_protosw, NULL);
2023 if (pim6_encap_cookie == NULL) {
2024 printf("ip6_mroute: unable to attach pim6 encap\n");
2025 MIF6_LOCK_DESTROY();
2026 MFC6_LOCK_DESTROY();
2027 MROUTER6_LOCK_DESTROY();
2028 return (EINVAL);
2029 }
2030
2031 ip6_mforward = X_ip6_mforward;
2032 ip6_mrouter_done = X_ip6_mrouter_done;
2033 ip6_mrouter_get = X_ip6_mrouter_get;
2034 ip6_mrouter_set = X_ip6_mrouter_set;
2035 mrt6_ioctl = X_mrt6_ioctl;
2036 break;
2037
2038 case MOD_UNLOAD:
2039 if (V_ip6_mrouter != NULL)
2040 return EINVAL;
2041
2042 if (pim6_encap_cookie) {
2043 encap_detach(pim6_encap_cookie);
2044 pim6_encap_cookie = NULL;
2045 }
2046 X_ip6_mrouter_done();
2047 ip6_mforward = NULL;
2048 ip6_mrouter_done = NULL;
2049 ip6_mrouter_get = NULL;
2050 ip6_mrouter_set = NULL;
2051 mrt6_ioctl = NULL;
2052
2053 MIF6_LOCK_DESTROY();
2054 MFC6_LOCK_DESTROY();
2055 MROUTER6_LOCK_DESTROY();
2056 break;
2057
2058 default:
2059 return (EOPNOTSUPP);
2060 }
2061
2062 return (0);
2063 }
2064
2065 static moduledata_t ip6_mroutemod = {
2066 "ip6_mroute",
2067 ip6_mroute_modevent,
2068 0
2069 };
2070
2071 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 57315861a930ba83dd29221dac81135d
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