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/10.1/sys/netinet6/ip6_mroute.c 263069 2014-03-12 08:15:15Z brueffer $");
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 #define DEBUG_ERR 0x80
225 #define DEBUG_ANY 0x7f
226 #define MRT6_DLOG(m, fmt, ...) \
227 if (V_mrt6debug & (m)) \
228 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
229 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
230 #else
231 #define MRT6_DLOG(m, fmt, ...)
232 #endif
233
234 static void expire_upcalls(void *);
235 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
236 #define UPCALL_EXPIRE 6 /* number of timeouts */
237
238 /*
239 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
240 */
241
242 /*
243 * 'Interfaces' associated with decapsulator (so we can tell
244 * packets that went through it from ones that get reflected
245 * by a broken gateway). Different from IPv4 register_if,
246 * these interfaces are linked into the system ifnet list,
247 * because per-interface IPv6 statistics are maintained in
248 * ifp->if_afdata. But it does not have any routes point
249 * to them. I.e., packets can't be sent this way. They
250 * only exist as a placeholder for multicast source
251 * verification.
252 */
253 static struct ifnet *multicast_register_if6;
254
255 #define ENCAP_HOPS 64
256
257 /*
258 * Private variables.
259 */
260 static mifi_t nummifs = 0;
261 static mifi_t reg_mif_num = (mifi_t)-1;
262
263 static struct pim6stat pim6stat;
264 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
265 &pim6stat, pim6stat,
266 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
267
268 #define PIM6STAT_INC(name) pim6stat.name += 1
269 static VNET_DEFINE(int, pim6);
270 #define V_pim6 VNET(pim6)
271
272 /*
273 * Hash function for a source, group entry
274 */
275 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
276 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
277 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
278 (g).s6_addr32[2] ^ (g).s6_addr32[3])
279
280 /*
281 * Find a route for a given origin IPv6 address and Multicast group address.
282 */
283 #define MF6CFIND(o, g, rt) do { \
284 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
285 rt = NULL; \
286 while (_rt) { \
287 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
288 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
289 (_rt->mf6c_stall == NULL)) { \
290 rt = _rt; \
291 break; \
292 } \
293 _rt = _rt->mf6c_next; \
294 } \
295 if (rt == NULL) { \
296 MRT6STAT_INC(mrt6s_mfc_misses); \
297 } \
298 } while (/*CONSTCOND*/ 0)
299
300 /*
301 * Macros to compute elapsed time efficiently
302 * Borrowed from Van Jacobson's scheduling code
303 * XXX: replace with timersub() ?
304 */
305 #define TV_DELTA(a, b, delta) do { \
306 int xxs; \
307 \
308 delta = (a).tv_usec - (b).tv_usec; \
309 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
310 switch (xxs) { \
311 case 2: \
312 delta += 1000000; \
313 /* FALLTHROUGH */ \
314 case 1: \
315 delta += 1000000; \
316 break; \
317 default: \
318 delta += (1000000 * xxs); \
319 } \
320 } \
321 } while (/*CONSTCOND*/ 0)
322
323 /* XXX: replace with timercmp(a, b, <) ? */
324 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
325 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
326
327 #ifdef UPCALL_TIMING
328 #define UPCALL_MAX 50
329 static u_long upcall_data[UPCALL_MAX + 1];
330 static void collate();
331 #endif /* UPCALL_TIMING */
332
333 static int ip6_mrouter_init(struct socket *, int, int);
334 static int add_m6fc(struct mf6cctl *);
335 static int add_m6if(struct mif6ctl *);
336 static int del_m6fc(struct mf6cctl *);
337 static int del_m6if(mifi_t *);
338 static int del_m6if_locked(mifi_t *);
339 static int get_mif6_cnt(struct sioc_mif_req6 *);
340 static int get_sg_cnt(struct sioc_sg_req6 *);
341
342 static struct callout expire_upcalls_ch;
343
344 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
345 int X_ip6_mrouter_done(void);
346 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
347 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
348 int X_mrt6_ioctl(u_long, caddr_t);
349
350 /*
351 * Handle MRT setsockopt commands to modify the multicast routing tables.
352 */
353 int
354 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
355 {
356 int error = 0;
357 int optval;
358 struct mif6ctl mifc;
359 struct mf6cctl mfcc;
360 mifi_t mifi;
361
362 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
363 return (EACCES);
364
365 switch (sopt->sopt_name) {
366 case MRT6_INIT:
367 #ifdef MRT6_OINIT
368 case MRT6_OINIT:
369 #endif
370 error = sooptcopyin(sopt, &optval, sizeof(optval),
371 sizeof(optval));
372 if (error)
373 break;
374 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
375 break;
376 case MRT6_DONE:
377 error = X_ip6_mrouter_done();
378 break;
379 case MRT6_ADD_MIF:
380 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
381 if (error)
382 break;
383 error = add_m6if(&mifc);
384 break;
385 case MRT6_ADD_MFC:
386 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
387 if (error)
388 break;
389 error = add_m6fc(&mfcc);
390 break;
391 case MRT6_DEL_MFC:
392 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
393 if (error)
394 break;
395 error = del_m6fc(&mfcc);
396 break;
397 case MRT6_DEL_MIF:
398 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
399 if (error)
400 break;
401 error = del_m6if(&mifi);
402 break;
403 case MRT6_PIM:
404 error = sooptcopyin(sopt, &optval, sizeof(optval),
405 sizeof(optval));
406 if (error)
407 break;
408 error = set_pim6(&optval);
409 break;
410 default:
411 error = EOPNOTSUPP;
412 break;
413 }
414
415 return (error);
416 }
417
418 /*
419 * Handle MRT getsockopt commands
420 */
421 int
422 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
423 {
424 int error = 0;
425
426 if (so != V_ip6_mrouter)
427 return (EACCES);
428
429 switch (sopt->sopt_name) {
430 case MRT6_PIM:
431 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
432 break;
433 }
434 return (error);
435 }
436
437 /*
438 * Handle ioctl commands to obtain information from the cache
439 */
440 int
441 X_mrt6_ioctl(u_long cmd, caddr_t data)
442 {
443 int ret;
444
445 ret = EINVAL;
446
447 switch (cmd) {
448 case SIOCGETSGCNT_IN6:
449 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
450 break;
451
452 case SIOCGETMIFCNT_IN6:
453 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
454 break;
455
456 default:
457 break;
458 }
459
460 return (ret);
461 }
462
463 /*
464 * returns the packet, byte, rpf-failure count for the source group provided
465 */
466 static int
467 get_sg_cnt(struct sioc_sg_req6 *req)
468 {
469 struct mf6c *rt;
470 int ret;
471
472 ret = 0;
473
474 MFC6_LOCK();
475
476 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
477 if (rt == NULL) {
478 ret = ESRCH;
479 } else {
480 req->pktcnt = rt->mf6c_pkt_cnt;
481 req->bytecnt = rt->mf6c_byte_cnt;
482 req->wrong_if = rt->mf6c_wrong_if;
483 }
484
485 MFC6_UNLOCK();
486
487 return (ret);
488 }
489
490 /*
491 * returns the input and output packet and byte counts on the mif provided
492 */
493 static int
494 get_mif6_cnt(struct sioc_mif_req6 *req)
495 {
496 mifi_t mifi;
497 int ret;
498
499 ret = 0;
500 mifi = req->mifi;
501
502 MIF6_LOCK();
503
504 if (mifi >= nummifs) {
505 ret = EINVAL;
506 } else {
507 req->icount = mif6table[mifi].m6_pkt_in;
508 req->ocount = mif6table[mifi].m6_pkt_out;
509 req->ibytes = mif6table[mifi].m6_bytes_in;
510 req->obytes = mif6table[mifi].m6_bytes_out;
511 }
512
513 MIF6_UNLOCK();
514
515 return (ret);
516 }
517
518 static int
519 set_pim6(int *i)
520 {
521 if ((*i != 1) && (*i != 0))
522 return (EINVAL);
523
524 V_pim6 = *i;
525
526 return (0);
527 }
528
529 /*
530 * Enable multicast routing
531 */
532 static int
533 ip6_mrouter_init(struct socket *so, int v, int cmd)
534 {
535
536 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
537 so->so_type, so->so_proto->pr_protocol);
538
539 if (so->so_type != SOCK_RAW ||
540 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
541 return (EOPNOTSUPP);
542
543 if (v != 1)
544 return (ENOPROTOOPT);
545
546 MROUTER6_LOCK();
547
548 if (V_ip6_mrouter != NULL) {
549 MROUTER6_UNLOCK();
550 return (EADDRINUSE);
551 }
552
553 V_ip6_mrouter = so;
554 V_ip6_mrouter_ver = cmd;
555
556 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
557 bzero((caddr_t)n6expire, sizeof(n6expire));
558
559 V_pim6 = 0;/* used for stubbing out/in pim stuff */
560
561 callout_init(&expire_upcalls_ch, 0);
562 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
563 expire_upcalls, NULL);
564
565 MROUTER6_UNLOCK();
566 MRT6_DLOG(DEBUG_ANY, "finished");
567
568 return (0);
569 }
570
571 /*
572 * Disable IPv6 multicast forwarding.
573 */
574 int
575 X_ip6_mrouter_done(void)
576 {
577 mifi_t mifi;
578 u_long i;
579 struct mf6c *rt;
580 struct rtdetq *rte;
581
582 MROUTER6_LOCK();
583
584 if (V_ip6_mrouter == NULL) {
585 MROUTER6_UNLOCK();
586 return (EINVAL);
587 }
588
589 /*
590 * For each phyint in use, disable promiscuous reception of all IPv6
591 * multicasts.
592 */
593 for (mifi = 0; mifi < nummifs; mifi++) {
594 if (mif6table[mifi].m6_ifp &&
595 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
596 if_allmulti(mif6table[mifi].m6_ifp, 0);
597 }
598 }
599 bzero((caddr_t)mif6table, sizeof(mif6table));
600 nummifs = 0;
601
602 V_pim6 = 0; /* used to stub out/in pim specific code */
603
604 callout_stop(&expire_upcalls_ch);
605
606 /*
607 * Free all multicast forwarding cache entries.
608 */
609 MFC6_LOCK();
610 for (i = 0; i < MF6CTBLSIZ; i++) {
611 rt = mf6ctable[i];
612 while (rt) {
613 struct mf6c *frt;
614
615 for (rte = rt->mf6c_stall; rte != NULL; ) {
616 struct rtdetq *n = rte->next;
617
618 m_freem(rte->m);
619 free(rte, M_MRTABLE6);
620 rte = n;
621 }
622 frt = rt;
623 rt = rt->mf6c_next;
624 free(frt, M_MRTABLE6);
625 }
626 }
627 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
628 MFC6_UNLOCK();
629
630 /*
631 * Reset register interface
632 */
633 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
634 if_detach(multicast_register_if6);
635 if_free(multicast_register_if6);
636 reg_mif_num = (mifi_t)-1;
637 multicast_register_if6 = NULL;
638 }
639
640 V_ip6_mrouter = NULL;
641 V_ip6_mrouter_ver = 0;
642
643 MROUTER6_UNLOCK();
644 MRT6_DLOG(DEBUG_ANY, "finished");
645
646 return (0);
647 }
648
649 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
650
651 /*
652 * Add a mif to the mif table
653 */
654 static int
655 add_m6if(struct mif6ctl *mifcp)
656 {
657 struct mif6 *mifp;
658 struct ifnet *ifp;
659 int error;
660
661 MIF6_LOCK();
662
663 if (mifcp->mif6c_mifi >= MAXMIFS) {
664 MIF6_UNLOCK();
665 return (EINVAL);
666 }
667 mifp = mif6table + mifcp->mif6c_mifi;
668 if (mifp->m6_ifp != NULL) {
669 MIF6_UNLOCK();
670 return (EADDRINUSE); /* XXX: is it appropriate? */
671 }
672 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
673 MIF6_UNLOCK();
674 return (ENXIO);
675 }
676
677 ifp = ifnet_byindex(mifcp->mif6c_pifi);
678
679 if (mifcp->mif6c_flags & MIFF_REGISTER) {
680 if (reg_mif_num == (mifi_t)-1) {
681 ifp = if_alloc(IFT_OTHER);
682
683 if_initname(ifp, "register_mif", 0);
684 ifp->if_flags |= IFF_LOOPBACK;
685 if_attach(ifp);
686 multicast_register_if6 = ifp;
687 reg_mif_num = mifcp->mif6c_mifi;
688 /*
689 * it is impossible to guess the ifindex of the
690 * register interface. So mif6c_pifi is automatically
691 * calculated.
692 */
693 mifcp->mif6c_pifi = ifp->if_index;
694 } else {
695 ifp = multicast_register_if6;
696 }
697 } else {
698 /* Make sure the interface supports multicast */
699 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
700 MIF6_UNLOCK();
701 return (EOPNOTSUPP);
702 }
703
704 error = if_allmulti(ifp, 1);
705 if (error) {
706 MIF6_UNLOCK();
707 return (error);
708 }
709 }
710
711 mifp->m6_flags = mifcp->mif6c_flags;
712 mifp->m6_ifp = ifp;
713
714 /* initialize per mif pkt counters */
715 mifp->m6_pkt_in = 0;
716 mifp->m6_pkt_out = 0;
717 mifp->m6_bytes_in = 0;
718 mifp->m6_bytes_out = 0;
719
720 /* Adjust nummifs up if the mifi is higher than nummifs */
721 if (nummifs <= mifcp->mif6c_mifi)
722 nummifs = mifcp->mif6c_mifi + 1;
723
724 MIF6_UNLOCK();
725 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
726 if_name(ifp));
727
728 return (0);
729 }
730
731 /*
732 * Delete a mif from the mif table
733 */
734 static int
735 del_m6if_locked(mifi_t *mifip)
736 {
737 struct mif6 *mifp = mif6table + *mifip;
738 mifi_t mifi;
739 struct ifnet *ifp;
740
741 MIF6_LOCK_ASSERT();
742
743 if (*mifip >= nummifs)
744 return (EINVAL);
745 if (mifp->m6_ifp == NULL)
746 return (EINVAL);
747
748 if (!(mifp->m6_flags & MIFF_REGISTER)) {
749 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
750 ifp = mifp->m6_ifp;
751 if_allmulti(ifp, 0);
752 } else {
753 if (reg_mif_num != (mifi_t)-1 &&
754 multicast_register_if6 != NULL) {
755 if_detach(multicast_register_if6);
756 if_free(multicast_register_if6);
757 reg_mif_num = (mifi_t)-1;
758 multicast_register_if6 = NULL;
759 }
760 }
761
762 bzero((caddr_t)mifp, sizeof(*mifp));
763
764 /* Adjust nummifs down */
765 for (mifi = nummifs; mifi > 0; mifi--)
766 if (mif6table[mifi - 1].m6_ifp)
767 break;
768 nummifs = mifi;
769 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
770
771 return (0);
772 }
773
774 static int
775 del_m6if(mifi_t *mifip)
776 {
777 int cc;
778
779 MIF6_LOCK();
780 cc = del_m6if_locked(mifip);
781 MIF6_UNLOCK();
782
783 return (cc);
784 }
785
786 /*
787 * Add an mfc entry
788 */
789 static int
790 add_m6fc(struct mf6cctl *mfccp)
791 {
792 struct mf6c *rt;
793 u_long hash;
794 struct rtdetq *rte;
795 u_short nstl;
796 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
797
798 MFC6_LOCK();
799
800 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
801 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
802
803 /* If an entry already exists, just update the fields */
804 if (rt) {
805 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
806 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
807 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
808 mfccp->mf6cc_parent);
809
810 rt->mf6c_parent = mfccp->mf6cc_parent;
811 rt->mf6c_ifset = mfccp->mf6cc_ifset;
812
813 MFC6_UNLOCK();
814 return (0);
815 }
816
817 /*
818 * Find the entry for which the upcall was made and update
819 */
820 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
821 mfccp->mf6cc_mcastgrp.sin6_addr);
822 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
823 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
824 &mfccp->mf6cc_origin.sin6_addr) &&
825 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
826 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
827 (rt->mf6c_stall != NULL)) {
828
829 if (nstl++)
830 log(LOG_ERR,
831 "add_m6fc: %s o %s g %s p %x dbx %p\n",
832 "multiple kernel entries",
833 ip6_sprintf(ip6bufo,
834 &mfccp->mf6cc_origin.sin6_addr),
835 ip6_sprintf(ip6bufg,
836 &mfccp->mf6cc_mcastgrp.sin6_addr),
837 mfccp->mf6cc_parent, rt->mf6c_stall);
838
839 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
840 ip6_sprintf(ip6bufo,
841 &mfccp->mf6cc_origin.sin6_addr),
842 ip6_sprintf(ip6bufg,
843 &mfccp->mf6cc_mcastgrp.sin6_addr),
844 mfccp->mf6cc_parent, rt->mf6c_stall);
845
846 rt->mf6c_origin = mfccp->mf6cc_origin;
847 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
848 rt->mf6c_parent = mfccp->mf6cc_parent;
849 rt->mf6c_ifset = mfccp->mf6cc_ifset;
850 /* initialize pkt counters per src-grp */
851 rt->mf6c_pkt_cnt = 0;
852 rt->mf6c_byte_cnt = 0;
853 rt->mf6c_wrong_if = 0;
854
855 rt->mf6c_expire = 0; /* Don't clean this guy up */
856 n6expire[hash]--;
857
858 /* free packets Qed at the end of this entry */
859 for (rte = rt->mf6c_stall; rte != NULL; ) {
860 struct rtdetq *n = rte->next;
861 ip6_mdq(rte->m, rte->ifp, rt);
862 m_freem(rte->m);
863 #ifdef UPCALL_TIMING
864 collate(&(rte->t));
865 #endif /* UPCALL_TIMING */
866 free(rte, M_MRTABLE6);
867 rte = n;
868 }
869 rt->mf6c_stall = NULL;
870 }
871 }
872
873 /*
874 * It is possible that an entry is being inserted without an upcall
875 */
876 if (nstl == 0) {
877 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
878 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
879 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
880 mfccp->mf6cc_parent);
881
882 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
883
884 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
885 &mfccp->mf6cc_origin.sin6_addr)&&
886 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
887 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
888
889 rt->mf6c_origin = mfccp->mf6cc_origin;
890 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
891 rt->mf6c_parent = mfccp->mf6cc_parent;
892 rt->mf6c_ifset = mfccp->mf6cc_ifset;
893 /* initialize pkt counters per src-grp */
894 rt->mf6c_pkt_cnt = 0;
895 rt->mf6c_byte_cnt = 0;
896 rt->mf6c_wrong_if = 0;
897
898 if (rt->mf6c_expire)
899 n6expire[hash]--;
900 rt->mf6c_expire = 0;
901 }
902 }
903 if (rt == NULL) {
904 /* no upcall, so make a new entry */
905 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
906 M_NOWAIT);
907 if (rt == NULL) {
908 MFC6_UNLOCK();
909 return (ENOBUFS);
910 }
911
912 /* insert new entry at head of hash chain */
913 rt->mf6c_origin = mfccp->mf6cc_origin;
914 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
915 rt->mf6c_parent = mfccp->mf6cc_parent;
916 rt->mf6c_ifset = mfccp->mf6cc_ifset;
917 /* initialize pkt counters per src-grp */
918 rt->mf6c_pkt_cnt = 0;
919 rt->mf6c_byte_cnt = 0;
920 rt->mf6c_wrong_if = 0;
921 rt->mf6c_expire = 0;
922 rt->mf6c_stall = NULL;
923
924 /* link into table */
925 rt->mf6c_next = mf6ctable[hash];
926 mf6ctable[hash] = rt;
927 }
928 }
929
930 MFC6_UNLOCK();
931 return (0);
932 }
933
934 #ifdef UPCALL_TIMING
935 /*
936 * collect delay statistics on the upcalls
937 */
938 static void
939 collate(struct timeval *t)
940 {
941 u_long d;
942 struct timeval tp;
943 u_long delta;
944
945 GET_TIME(tp);
946
947 if (TV_LT(*t, tp))
948 {
949 TV_DELTA(tp, *t, delta);
950
951 d = delta >> 10;
952 if (d > UPCALL_MAX)
953 d = UPCALL_MAX;
954
955 ++upcall_data[d];
956 }
957 }
958 #endif /* UPCALL_TIMING */
959
960 /*
961 * Delete an mfc entry
962 */
963 static int
964 del_m6fc(struct mf6cctl *mfccp)
965 {
966 #ifdef MRT6DEBUG
967 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
968 #endif
969 struct sockaddr_in6 origin;
970 struct sockaddr_in6 mcastgrp;
971 struct mf6c *rt;
972 struct mf6c **nptr;
973 u_long hash;
974
975 origin = mfccp->mf6cc_origin;
976 mcastgrp = mfccp->mf6cc_mcastgrp;
977 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
978
979 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
980 ip6_sprintf(ip6bufo, &origin.sin6_addr),
981 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
982
983 MFC6_LOCK();
984
985 nptr = &mf6ctable[hash];
986 while ((rt = *nptr) != NULL) {
987 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
988 &rt->mf6c_origin.sin6_addr) &&
989 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
990 &rt->mf6c_mcastgrp.sin6_addr) &&
991 rt->mf6c_stall == NULL)
992 break;
993
994 nptr = &rt->mf6c_next;
995 }
996 if (rt == NULL) {
997 MFC6_UNLOCK();
998 return (EADDRNOTAVAIL);
999 }
1000
1001 *nptr = rt->mf6c_next;
1002 free(rt, M_MRTABLE6);
1003
1004 MFC6_UNLOCK();
1005
1006 return (0);
1007 }
1008
1009 static int
1010 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1011 {
1012
1013 if (s) {
1014 if (sbappendaddr(&s->so_rcv,
1015 (struct sockaddr *)src,
1016 mm, (struct mbuf *)0) != 0) {
1017 sorwakeup(s);
1018 return (0);
1019 }
1020 }
1021 m_freem(mm);
1022 return (-1);
1023 }
1024
1025 /*
1026 * IPv6 multicast forwarding function. This function assumes that the packet
1027 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1028 * pointed to by "ifp", and the packet is to be relayed to other networks
1029 * that have members of the packet's destination IPv6 multicast group.
1030 *
1031 * The packet is returned unscathed to the caller, unless it is
1032 * erroneous, in which case a non-zero return value tells the caller to
1033 * discard it.
1034 *
1035 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1036 * this function is called in the originating context (i.e., not when
1037 * forwarding a packet from other node). ip6_output(), which is currently the
1038 * only function that calls this function is called in the originating context,
1039 * explicitly ensures this condition. It is caller's responsibility to ensure
1040 * that if this function is called from somewhere else in the originating
1041 * context in the future.
1042 */
1043 int
1044 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1045 {
1046 struct rtdetq *rte;
1047 struct mbuf *mb0;
1048 struct mf6c *rt;
1049 struct mif6 *mifp;
1050 struct mbuf *mm;
1051 u_long hash;
1052 mifi_t mifi;
1053 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1054 #ifdef UPCALL_TIMING
1055 struct timeval tp;
1056
1057 GET_TIME(tp);
1058 #endif /* UPCALL_TIMING */
1059
1060 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1061 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1062 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1063
1064 /*
1065 * Don't forward a packet with Hop limit of zero or one,
1066 * or a packet destined to a local-only group.
1067 */
1068 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1069 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1070 return (0);
1071 ip6->ip6_hlim--;
1072
1073 /*
1074 * Source address check: do not forward packets with unspecified
1075 * source. It was discussed in July 2000, on ipngwg mailing list.
1076 * This is rather more serious than unicast cases, because some
1077 * MLD packets can be sent with the unspecified source address
1078 * (although such packets must normally set 1 to the hop limit field).
1079 */
1080 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1081 IP6STAT_INC(ip6s_cantforward);
1082 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1083 V_ip6_log_time = time_uptime;
1084 log(LOG_DEBUG,
1085 "cannot forward "
1086 "from %s to %s nxt %d received on %s\n",
1087 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1088 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1089 ip6->ip6_nxt,
1090 if_name(m->m_pkthdr.rcvif));
1091 }
1092 return (0);
1093 }
1094
1095 MFC6_LOCK();
1096
1097 /*
1098 * Determine forwarding mifs from the forwarding cache table
1099 */
1100 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1101 MRT6STAT_INC(mrt6s_mfc_lookups);
1102
1103 /* Entry exists, so forward if necessary */
1104 if (rt) {
1105 MFC6_UNLOCK();
1106 return (ip6_mdq(m, ifp, rt));
1107 }
1108
1109 /*
1110 * If we don't have a route for packet's origin,
1111 * Make a copy of the packet & send message to routing daemon.
1112 */
1113 MRT6STAT_INC(mrt6s_no_route);
1114 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1115 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1116 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1117
1118 /*
1119 * Allocate mbufs early so that we don't do extra work if we
1120 * are just going to fail anyway.
1121 */
1122 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1123 if (rte == NULL) {
1124 MFC6_UNLOCK();
1125 return (ENOBUFS);
1126 }
1127 mb0 = m_copy(m, 0, M_COPYALL);
1128 /*
1129 * Pullup packet header if needed before storing it,
1130 * as other references may modify it in the meantime.
1131 */
1132 if (mb0 && (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1133 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1134 if (mb0 == NULL) {
1135 free(rte, M_MRTABLE6);
1136 MFC6_UNLOCK();
1137 return (ENOBUFS);
1138 }
1139
1140 /* is there an upcall waiting for this packet? */
1141 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1142 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1143 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1144 &rt->mf6c_origin.sin6_addr) &&
1145 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1146 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1147 break;
1148 }
1149
1150 if (rt == NULL) {
1151 struct mrt6msg *im;
1152 #ifdef MRT6_OINIT
1153 struct omrt6msg *oim;
1154 #endif
1155 /* no upcall, so make a new entry */
1156 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1157 if (rt == NULL) {
1158 free(rte, M_MRTABLE6);
1159 m_freem(mb0);
1160 MFC6_UNLOCK();
1161 return (ENOBUFS);
1162 }
1163 /*
1164 * Make a copy of the header to send to the user
1165 * level process
1166 */
1167 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1168 if (mm == NULL) {
1169 free(rte, M_MRTABLE6);
1170 m_freem(mb0);
1171 free(rt, M_MRTABLE6);
1172 MFC6_UNLOCK();
1173 return (ENOBUFS);
1174 }
1175
1176 /*
1177 * Send message to routing daemon
1178 */
1179 sin6.sin6_addr = ip6->ip6_src;
1180 im = NULL;
1181 #ifdef MRT6_OINIT
1182 oim = NULL;
1183 #endif
1184 switch (V_ip6_mrouter_ver) {
1185 #ifdef MRT6_OINIT
1186 case MRT6_OINIT:
1187 oim = mtod(mm, struct omrt6msg *);
1188 oim->im6_msgtype = MRT6MSG_NOCACHE;
1189 oim->im6_mbz = 0;
1190 break;
1191 #endif
1192 case MRT6_INIT:
1193 im = mtod(mm, struct mrt6msg *);
1194 im->im6_msgtype = MRT6MSG_NOCACHE;
1195 im->im6_mbz = 0;
1196 break;
1197 default:
1198 free(rte, M_MRTABLE6);
1199 m_freem(mb0);
1200 free(rt, M_MRTABLE6);
1201 MFC6_UNLOCK();
1202 return (EINVAL);
1203 }
1204
1205 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1206 for (mifp = mif6table, mifi = 0;
1207 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1208 ;
1209
1210 switch (V_ip6_mrouter_ver) {
1211 #ifdef MRT6_OINIT
1212 case MRT6_OINIT:
1213 oim->im6_mif = mifi;
1214 break;
1215 #endif
1216 case MRT6_INIT:
1217 im->im6_mif = mifi;
1218 break;
1219 }
1220
1221 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1222 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1223 "socket queue full\n");
1224 MRT6STAT_INC(mrt6s_upq_sockfull);
1225 free(rte, M_MRTABLE6);
1226 m_freem(mb0);
1227 free(rt, M_MRTABLE6);
1228 MFC6_UNLOCK();
1229 return (ENOBUFS);
1230 }
1231
1232 MRT6STAT_INC(mrt6s_upcalls);
1233
1234 /* insert new entry at head of hash chain */
1235 bzero(rt, sizeof(*rt));
1236 rt->mf6c_origin.sin6_family = AF_INET6;
1237 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1238 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1239 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1240 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1241 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1242 rt->mf6c_expire = UPCALL_EXPIRE;
1243 n6expire[hash]++;
1244 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1245
1246 /* link into table */
1247 rt->mf6c_next = mf6ctable[hash];
1248 mf6ctable[hash] = rt;
1249 /* Add this entry to the end of the queue */
1250 rt->mf6c_stall = rte;
1251 } else {
1252 /* determine if q has overflowed */
1253 struct rtdetq **p;
1254 int npkts = 0;
1255
1256 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1257 if (++npkts > MAX_UPQ6) {
1258 MRT6STAT_INC(mrt6s_upq_ovflw);
1259 free(rte, M_MRTABLE6);
1260 m_freem(mb0);
1261 MFC6_UNLOCK();
1262 return (0);
1263 }
1264
1265 /* Add this entry to the end of the queue */
1266 *p = rte;
1267 }
1268
1269 rte->next = NULL;
1270 rte->m = mb0;
1271 rte->ifp = ifp;
1272 #ifdef UPCALL_TIMING
1273 rte->t = tp;
1274 #endif /* UPCALL_TIMING */
1275
1276 MFC6_UNLOCK();
1277
1278 return (0);
1279 }
1280
1281 /*
1282 * Clean up cache entries if upcalls are not serviced
1283 * Call from the Slow Timeout mechanism, every half second.
1284 */
1285 static void
1286 expire_upcalls(void *unused)
1287 {
1288 #ifdef MRT6DEBUG
1289 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1290 #endif
1291 struct rtdetq *rte;
1292 struct mf6c *mfc, **nptr;
1293 u_long i;
1294
1295 MFC6_LOCK();
1296 for (i = 0; i < MF6CTBLSIZ; i++) {
1297 if (n6expire[i] == 0)
1298 continue;
1299 nptr = &mf6ctable[i];
1300 while ((mfc = *nptr) != NULL) {
1301 rte = mfc->mf6c_stall;
1302 /*
1303 * Skip real cache entries
1304 * Make sure it wasn't marked to not expire (shouldn't happen)
1305 * If it expires now
1306 */
1307 if (rte != NULL &&
1308 mfc->mf6c_expire != 0 &&
1309 --mfc->mf6c_expire == 0) {
1310 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1311 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1312 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1313 /*
1314 * drop all the packets
1315 * free the mbuf with the pkt, if, timing info
1316 */
1317 do {
1318 struct rtdetq *n = rte->next;
1319 m_freem(rte->m);
1320 free(rte, M_MRTABLE6);
1321 rte = n;
1322 } while (rte != NULL);
1323 MRT6STAT_INC(mrt6s_cache_cleanups);
1324 n6expire[i]--;
1325
1326 *nptr = mfc->mf6c_next;
1327 free(mfc, M_MRTABLE6);
1328 } else {
1329 nptr = &mfc->mf6c_next;
1330 }
1331 }
1332 }
1333 MFC6_UNLOCK();
1334 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1335 expire_upcalls, NULL);
1336 }
1337
1338 /*
1339 * Packet forwarding routine once entry in the cache is made
1340 */
1341 static int
1342 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1343 {
1344 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1345 mifi_t mifi, iif;
1346 struct mif6 *mifp;
1347 int plen = m->m_pkthdr.len;
1348 struct in6_addr src0, dst0; /* copies for local work */
1349 u_int32_t iszone, idzone, oszone, odzone;
1350 int error = 0;
1351
1352 /*
1353 * Macro to send packet on mif. Since RSVP packets don't get counted on
1354 * input, they shouldn't get counted on output, so statistics keeping is
1355 * separate.
1356 */
1357
1358 #define MC6_SEND(ip6, mifp, m) do { \
1359 if ((mifp)->m6_flags & MIFF_REGISTER) \
1360 register_send((ip6), (mifp), (m)); \
1361 else \
1362 phyint_send((ip6), (mifp), (m)); \
1363 } while (/*CONSTCOND*/ 0)
1364
1365 /*
1366 * Don't forward if it didn't arrive from the parent mif
1367 * for its origin.
1368 */
1369 mifi = rt->mf6c_parent;
1370 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1371 /* came in the wrong interface */
1372 MRT6_DLOG(DEBUG_FORWARD,
1373 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1374 mifi, mif6table[mifi].m6_ifp->if_index);
1375 MRT6STAT_INC(mrt6s_wrong_if);
1376 rt->mf6c_wrong_if++;
1377 /*
1378 * If we are doing PIM processing, and we are forwarding
1379 * packets on this interface, send a message to the
1380 * routing daemon.
1381 */
1382 /* have to make sure this is a valid mif */
1383 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1384 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1385 /*
1386 * Check the M_LOOP flag to avoid an
1387 * unnecessary PIM assert.
1388 * XXX: M_LOOP is an ad-hoc hack...
1389 */
1390 static struct sockaddr_in6 sin6 =
1391 { sizeof(sin6), AF_INET6 };
1392
1393 struct mbuf *mm;
1394 struct mrt6msg *im;
1395 #ifdef MRT6_OINIT
1396 struct omrt6msg *oim;
1397 #endif
1398
1399 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1400 if (mm &&
1401 (M_HASCL(mm) ||
1402 mm->m_len < sizeof(struct ip6_hdr)))
1403 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1404 if (mm == NULL)
1405 return (ENOBUFS);
1406
1407 #ifdef MRT6_OINIT
1408 oim = NULL;
1409 #endif
1410 im = NULL;
1411 switch (V_ip6_mrouter_ver) {
1412 #ifdef MRT6_OINIT
1413 case MRT6_OINIT:
1414 oim = mtod(mm, struct omrt6msg *);
1415 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1416 oim->im6_mbz = 0;
1417 break;
1418 #endif
1419 case MRT6_INIT:
1420 im = mtod(mm, struct mrt6msg *);
1421 im->im6_msgtype = MRT6MSG_WRONGMIF;
1422 im->im6_mbz = 0;
1423 break;
1424 default:
1425 m_freem(mm);
1426 return (EINVAL);
1427 }
1428
1429 for (mifp = mif6table, iif = 0;
1430 iif < nummifs && mifp &&
1431 mifp->m6_ifp != ifp;
1432 mifp++, iif++)
1433 ;
1434
1435 switch (V_ip6_mrouter_ver) {
1436 #ifdef MRT6_OINIT
1437 case MRT6_OINIT:
1438 oim->im6_mif = iif;
1439 sin6.sin6_addr = oim->im6_src;
1440 break;
1441 #endif
1442 case MRT6_INIT:
1443 im->im6_mif = iif;
1444 sin6.sin6_addr = im->im6_src;
1445 break;
1446 }
1447
1448 MRT6STAT_INC(mrt6s_upcalls);
1449
1450 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1451 MRT6_DLOG(DEBUG_ANY,
1452 "ip6_mrouter socket queue full");
1453 MRT6STAT_INC(mrt6s_upq_sockfull);
1454 return (ENOBUFS);
1455 } /* if socket Q full */
1456 } /* if PIM */
1457 return (0);
1458 } /* if wrong iif */
1459
1460 /* If I sourced this packet, it counts as output, else it was input. */
1461 if (m->m_pkthdr.rcvif == NULL) {
1462 /* XXX: is rcvif really NULL when output?? */
1463 mif6table[mifi].m6_pkt_out++;
1464 mif6table[mifi].m6_bytes_out += plen;
1465 } else {
1466 mif6table[mifi].m6_pkt_in++;
1467 mif6table[mifi].m6_bytes_in += plen;
1468 }
1469 rt->mf6c_pkt_cnt++;
1470 rt->mf6c_byte_cnt += plen;
1471
1472 /*
1473 * For each mif, forward a copy of the packet if there are group
1474 * members downstream on the interface.
1475 */
1476 src0 = ip6->ip6_src;
1477 dst0 = ip6->ip6_dst;
1478 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1479 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1480 IP6STAT_INC(ip6s_badscope);
1481 return (error);
1482 }
1483 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1484 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1485 /*
1486 * check if the outgoing packet is going to break
1487 * a scope boundary.
1488 * XXX For packets through PIM register tunnel
1489 * interface, we believe a routing daemon.
1490 */
1491 if (!(mif6table[rt->mf6c_parent].m6_flags &
1492 MIFF_REGISTER) &&
1493 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1494 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1495 &oszone) ||
1496 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1497 &odzone) ||
1498 iszone != oszone ||
1499 idzone != odzone) {
1500 IP6STAT_INC(ip6s_badscope);
1501 continue;
1502 }
1503 }
1504
1505 mifp->m6_pkt_out++;
1506 mifp->m6_bytes_out += plen;
1507 MC6_SEND(ip6, mifp, m);
1508 }
1509 }
1510 return (0);
1511 }
1512
1513 static void
1514 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1515 {
1516 #ifdef MRT6DEBUG
1517 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1518 #endif
1519 struct mbuf *mb_copy;
1520 struct ifnet *ifp = mifp->m6_ifp;
1521 int error = 0;
1522 u_long linkmtu;
1523
1524 /*
1525 * Make a new reference to the packet; make sure that
1526 * the IPv6 header is actually copied, not just referenced,
1527 * so that ip6_output() only scribbles on the copy.
1528 */
1529 mb_copy = m_copy(m, 0, M_COPYALL);
1530 if (mb_copy &&
1531 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1532 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1533 if (mb_copy == NULL) {
1534 return;
1535 }
1536 /* set MCAST flag to the outgoing packet */
1537 mb_copy->m_flags |= M_MCAST;
1538
1539 /*
1540 * If we sourced the packet, call ip6_output since we may devide
1541 * the packet into fragments when the packet is too big for the
1542 * outgoing interface.
1543 * Otherwise, we can simply send the packet to the interface
1544 * sending queue.
1545 */
1546 if (m->m_pkthdr.rcvif == NULL) {
1547 struct ip6_moptions im6o;
1548
1549 im6o.im6o_multicast_ifp = ifp;
1550 /* XXX: ip6_output will override ip6->ip6_hlim */
1551 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1552 im6o.im6o_multicast_loop = 1;
1553 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1554 NULL, NULL);
1555
1556 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1557 (uint16_t)(mifp - mif6table), error);
1558 return;
1559 }
1560
1561 /*
1562 * If configured to loop back multicasts by default,
1563 * loop back a copy now.
1564 */
1565 if (in6_mcast_loop) {
1566 struct sockaddr_in6 dst6;
1567
1568 bzero(&dst6, sizeof(dst6));
1569 dst6.sin6_len = sizeof(struct sockaddr_in6);
1570 dst6.sin6_family = AF_INET6;
1571 dst6.sin6_addr = ip6->ip6_dst;
1572 ip6_mloopback(ifp, m, &dst6);
1573 }
1574
1575 /*
1576 * Put the packet into the sending queue of the outgoing interface
1577 * if it would fit in the MTU of the interface.
1578 */
1579 linkmtu = IN6_LINKMTU(ifp);
1580 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1581 struct sockaddr_in6 dst6;
1582
1583 bzero(&dst6, sizeof(dst6));
1584 dst6.sin6_len = sizeof(struct sockaddr_in6);
1585 dst6.sin6_family = AF_INET6;
1586 dst6.sin6_addr = ip6->ip6_dst;
1587
1588 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1589 /*
1590 * We just call if_output instead of nd6_output here, since
1591 * we need no ND for a multicast forwarded packet...right?
1592 */
1593 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1594 error = (*ifp->if_output)(ifp, mb_copy,
1595 (struct sockaddr *)&dst6, NULL);
1596 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1597 (uint16_t)(mifp - mif6table), error);
1598 } else {
1599 /*
1600 * pMTU discovery is intentionally disabled by default, since
1601 * various router may notify pMTU in multicast, which can be
1602 * a DDoS to a router
1603 */
1604 if (V_ip6_mcast_pmtu)
1605 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1606 else {
1607 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1608 "g %s size %d (discarded)", if_name(ifp),
1609 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1610 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1611 mb_copy->m_pkthdr.len);
1612 m_freem(mb_copy); /* simply discard the packet */
1613 }
1614 }
1615 }
1616
1617 static int
1618 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1619 {
1620 #ifdef MRT6DEBUG
1621 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1622 #endif
1623 struct mbuf *mm;
1624 int i, len = m->m_pkthdr.len;
1625 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1626 struct mrt6msg *im6;
1627
1628 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1629 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1630 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1631 PIM6STAT_INC(pim6s_snd_registers);
1632
1633 /* Make a copy of the packet to send to the user level process. */
1634 mm = m_gethdr(M_NOWAIT, MT_DATA);
1635 if (mm == NULL)
1636 return (ENOBUFS);
1637 mm->m_data += max_linkhdr;
1638 mm->m_len = sizeof(struct ip6_hdr);
1639
1640 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1641 m_freem(mm);
1642 return (ENOBUFS);
1643 }
1644 i = MHLEN - M_LEADINGSPACE(mm);
1645 if (i > len)
1646 i = len;
1647 mm = m_pullup(mm, i);
1648 if (mm == NULL)
1649 return (ENOBUFS);
1650 /* TODO: check it! */
1651 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1652
1653 /*
1654 * Send message to routing daemon
1655 */
1656 sin6.sin6_addr = ip6->ip6_src;
1657
1658 im6 = mtod(mm, struct mrt6msg *);
1659 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1660 im6->im6_mbz = 0;
1661
1662 im6->im6_mif = mif - mif6table;
1663
1664 /* iif info is not given for reg. encap.n */
1665 MRT6STAT_INC(mrt6s_upcalls);
1666
1667 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1668 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1669 MRT6STAT_INC(mrt6s_upq_sockfull);
1670 return (ENOBUFS);
1671 }
1672 return (0);
1673 }
1674
1675 /*
1676 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1677 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1678 * into the kernel.
1679 */
1680 static int
1681 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1682 {
1683
1684 #ifdef DIAGNOSTIC
1685 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1686 #endif
1687 if (proto != IPPROTO_PIM)
1688 return 0; /* not for us; reject the datagram. */
1689
1690 return 64; /* claim the datagram. */
1691 }
1692
1693 /*
1694 * PIM sparse mode hook
1695 * Receives the pim control messages, and passes them up to the listening
1696 * socket, using rip6_input.
1697 * The only message processed is the REGISTER pim message; the pim header
1698 * is stripped off, and the inner packet is passed to register_mforward.
1699 */
1700 int
1701 pim6_input(struct mbuf **mp, int *offp, int proto)
1702 {
1703 struct pim *pim; /* pointer to a pim struct */
1704 struct ip6_hdr *ip6;
1705 int pimlen;
1706 struct mbuf *m = *mp;
1707 int minlen;
1708 int off = *offp;
1709
1710 PIM6STAT_INC(pim6s_rcv_total);
1711
1712 ip6 = mtod(m, struct ip6_hdr *);
1713 pimlen = m->m_pkthdr.len - *offp;
1714
1715 /*
1716 * Validate lengths
1717 */
1718 if (pimlen < PIM_MINLEN) {
1719 PIM6STAT_INC(pim6s_rcv_tooshort);
1720 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1721 m_freem(m);
1722 return (IPPROTO_DONE);
1723 }
1724
1725 /*
1726 * if the packet is at least as big as a REGISTER, go ahead
1727 * and grab the PIM REGISTER header size, to avoid another
1728 * possible m_pullup() later.
1729 *
1730 * PIM_MINLEN == pimhdr + u_int32 == 8
1731 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1732 */
1733 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1734
1735 /*
1736 * Make sure that the IP6 and PIM headers in contiguous memory, and
1737 * possibly the PIM REGISTER header
1738 */
1739 #ifndef PULLDOWN_TEST
1740 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1741 /* adjust pointer */
1742 ip6 = mtod(m, struct ip6_hdr *);
1743
1744 /* adjust mbuf to point to the PIM header */
1745 pim = (struct pim *)((caddr_t)ip6 + off);
1746 #else
1747 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1748 if (pim == NULL) {
1749 PIM6STAT_INC(pim6s_rcv_tooshort);
1750 return (IPPROTO_DONE);
1751 }
1752 #endif
1753
1754 #define PIM6_CHECKSUM
1755 #ifdef PIM6_CHECKSUM
1756 {
1757 int cksumlen;
1758
1759 /*
1760 * Validate checksum.
1761 * If PIM REGISTER, exclude the data packet
1762 */
1763 if (pim->pim_type == PIM_REGISTER)
1764 cksumlen = PIM_MINLEN;
1765 else
1766 cksumlen = pimlen;
1767
1768 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1769 PIM6STAT_INC(pim6s_rcv_badsum);
1770 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1771 m_freem(m);
1772 return (IPPROTO_DONE);
1773 }
1774 }
1775 #endif /* PIM_CHECKSUM */
1776
1777 /* PIM version check */
1778 if (pim->pim_ver != PIM_VERSION) {
1779 PIM6STAT_INC(pim6s_rcv_badversion);
1780 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1781 "incorrect version %d, expecting %d",
1782 pim->pim_ver, PIM_VERSION);
1783 m_freem(m);
1784 return (IPPROTO_DONE);
1785 }
1786
1787 if (pim->pim_type == PIM_REGISTER) {
1788 /*
1789 * since this is a REGISTER, we'll make a copy of the register
1790 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1791 * routing daemon.
1792 */
1793 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1794
1795 struct mbuf *mcp;
1796 struct ip6_hdr *eip6;
1797 u_int32_t *reghdr;
1798 int rc;
1799 #ifdef MRT6DEBUG
1800 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1801 #endif
1802
1803 PIM6STAT_INC(pim6s_rcv_registers);
1804
1805 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1806 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1807 reg_mif_num);
1808 m_freem(m);
1809 return (IPPROTO_DONE);
1810 }
1811
1812 reghdr = (u_int32_t *)(pim + 1);
1813
1814 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1815 goto pim6_input_to_daemon;
1816
1817 /*
1818 * Validate length
1819 */
1820 if (pimlen < PIM6_REG_MINLEN) {
1821 PIM6STAT_INC(pim6s_rcv_tooshort);
1822 PIM6STAT_INC(pim6s_rcv_badregisters);
1823 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1824 "size too small %d from %s",
1825 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1826 m_freem(m);
1827 return (IPPROTO_DONE);
1828 }
1829
1830 eip6 = (struct ip6_hdr *) (reghdr + 1);
1831 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1832 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1833 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1834 ntohs(eip6->ip6_plen));
1835
1836 /* verify the version number of the inner packet */
1837 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1838 PIM6STAT_INC(pim6s_rcv_badregisters);
1839 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1840 "of the inner packet",
1841 (eip6->ip6_vfc & IPV6_VERSION));
1842 m_freem(m);
1843 return (IPPROTO_NONE);
1844 }
1845
1846 /* verify the inner packet is destined to a mcast group */
1847 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1848 PIM6STAT_INC(pim6s_rcv_badregisters);
1849 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1850 "is not multicast %s",
1851 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1852 m_freem(m);
1853 return (IPPROTO_DONE);
1854 }
1855
1856 /*
1857 * make a copy of the whole header to pass to the daemon later.
1858 */
1859 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1860 if (mcp == NULL) {
1861 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1862 "could not copy register head");
1863 m_freem(m);
1864 return (IPPROTO_DONE);
1865 }
1866
1867 /*
1868 * forward the inner ip6 packet; point m_data at the inner ip6.
1869 */
1870 m_adj(m, off + PIM_MINLEN);
1871 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1872 "src %s, dst %s, mif %d",
1873 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1874 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1875
1876 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1877 dst.sin6_family, 0);
1878
1879 /* prepare the register head to send to the mrouting daemon */
1880 m = mcp;
1881 }
1882
1883 /*
1884 * Pass the PIM message up to the daemon; if it is a register message
1885 * pass the 'head' only up to the daemon. This includes the
1886 * encapsulator ip6 header, pim header, register header and the
1887 * encapsulated ip6 header.
1888 */
1889 pim6_input_to_daemon:
1890 rip6_input(&m, offp, proto);
1891 return (IPPROTO_DONE);
1892 }
1893
1894 static int
1895 ip6_mroute_modevent(module_t mod, int type, void *unused)
1896 {
1897
1898 switch (type) {
1899 case MOD_LOAD:
1900 MROUTER6_LOCK_INIT();
1901 MFC6_LOCK_INIT();
1902 MIF6_LOCK_INIT();
1903
1904 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
1905 pim6_encapcheck,
1906 (const struct protosw *)&in6_pim_protosw, NULL);
1907 if (pim6_encap_cookie == NULL) {
1908 printf("ip6_mroute: unable to attach pim6 encap\n");
1909 MIF6_LOCK_DESTROY();
1910 MFC6_LOCK_DESTROY();
1911 MROUTER6_LOCK_DESTROY();
1912 return (EINVAL);
1913 }
1914
1915 ip6_mforward = X_ip6_mforward;
1916 ip6_mrouter_done = X_ip6_mrouter_done;
1917 ip6_mrouter_get = X_ip6_mrouter_get;
1918 ip6_mrouter_set = X_ip6_mrouter_set;
1919 mrt6_ioctl = X_mrt6_ioctl;
1920 break;
1921
1922 case MOD_UNLOAD:
1923 if (V_ip6_mrouter != NULL)
1924 return EINVAL;
1925
1926 if (pim6_encap_cookie) {
1927 encap_detach(pim6_encap_cookie);
1928 pim6_encap_cookie = NULL;
1929 }
1930 X_ip6_mrouter_done();
1931 ip6_mforward = NULL;
1932 ip6_mrouter_done = NULL;
1933 ip6_mrouter_get = NULL;
1934 ip6_mrouter_set = NULL;
1935 mrt6_ioctl = NULL;
1936
1937 MIF6_LOCK_DESTROY();
1938 MFC6_LOCK_DESTROY();
1939 MROUTER6_LOCK_DESTROY();
1940 break;
1941
1942 default:
1943 return (EOPNOTSUPP);
1944 }
1945
1946 return (0);
1947 }
1948
1949 static moduledata_t ip6_mroutemod = {
1950 "ip6_mroute",
1951 ip6_mroute_modevent,
1952 0
1953 };
1954
1955 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: e05e08c9caf35cb86eedf27136b86eef
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