1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
32 */
33
34 /*-
35 * Copyright (c) 1989 Stephen Deering
36 * Copyright (c) 1992, 1993
37 * The Regents of the University of California. All rights reserved.
38 *
39 * This code is derived from software contributed to Berkeley by
40 * Stephen Deering of Stanford University.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 3. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
67 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
68 */
69
70 /*
71 * IP multicast forwarding procedures
72 *
73 * Written by David Waitzman, BBN Labs, August 1988.
74 * Modified by Steve Deering, Stanford, February 1989.
75 * Modified by Mark J. Steiglitz, Stanford, May, 1991
76 * Modified by Van Jacobson, LBL, January 1993
77 * Modified by Ajit Thyagarajan, PARC, August 1993
78 * Modified by Bill Fenner, PARC, April 1994
79 *
80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
81 */
82
83 #include <sys/cdefs.h>
84 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/ip6_mroute.c 340980 2018-11-26 16:36:38Z markj $");
85
86 #include "opt_inet6.h"
87
88 #include <sys/param.h>
89 #include <sys/callout.h>
90 #include <sys/errno.h>
91 #include <sys/kernel.h>
92 #include <sys/lock.h>
93 #include <sys/malloc.h>
94 #include <sys/mbuf.h>
95 #include <sys/module.h>
96 #include <sys/domain.h>
97 #include <sys/protosw.h>
98 #include <sys/sdt.h>
99 #include <sys/signalvar.h>
100 #include <sys/socket.h>
101 #include <sys/socketvar.h>
102 #include <sys/sockio.h>
103 #include <sys/sx.h>
104 #include <sys/sysctl.h>
105 #include <sys/syslog.h>
106 #include <sys/systm.h>
107 #include <sys/time.h>
108
109 #include <net/if.h>
110 #include <net/if_var.h>
111 #include <net/if_types.h>
112 #include <net/vnet.h>
113
114 #include <netinet/in.h>
115 #include <netinet/in_var.h>
116 #include <netinet/icmp6.h>
117 #include <netinet/ip_encap.h>
118
119 #include <netinet/ip6.h>
120 #include <netinet/in_kdtrace.h>
121 #include <netinet6/ip6_var.h>
122 #include <netinet6/scope6_var.h>
123 #include <netinet6/nd6.h>
124 #include <netinet6/ip6_mroute.h>
125 #include <netinet6/pim6.h>
126 #include <netinet6/pim6_var.h>
127
128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
129
130 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
131 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
132 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
133 static int set_pim6(int *);
134 static int socket_send(struct socket *, struct mbuf *,
135 struct sockaddr_in6 *);
136
137 extern int in6_mcast_loop;
138 extern struct domain inet6domain;
139
140 static const struct encaptab *pim6_encap_cookie;
141 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
142 static int pim6_input(struct mbuf *, int, int, void *);
143
144 static const struct encap_config ipv6_encap_cfg = {
145 .proto = IPPROTO_PIM,
146 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN,
147 .exact_match = 8,
148 .check = pim6_encapcheck,
149 .input = pim6_input
150 };
151
152
153 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
154 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
155
156 SYSCTL_DECL(_net_inet6);
157 SYSCTL_DECL(_net_inet6_ip6);
158 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
159
160 static struct mrt6stat mrt6stat;
161 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
162 &mrt6stat, mrt6stat,
163 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
164
165 #define MRT6STAT_INC(name) mrt6stat.name += 1
166 #define NO_RTE_FOUND 0x1
167 #define RTE_FOUND 0x2
168
169 static struct mtx mrouter6_mtx;
170 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
171 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
172 #define MROUTER6_LOCK_ASSERT() do { \
173 mtx_assert(&mrouter6_mtx, MA_OWNED); \
174 NET_ASSERT_GIANT(); \
175 } while (0)
176 #define MROUTER6_LOCK_INIT() \
177 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
178 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
179
180 static struct mf6c *mf6ctable[MF6CTBLSIZ];
181 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
182 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
183 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
184 "netinet6/ip6_mroute.h)");
185
186 static struct mtx mfc6_mtx;
187 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
188 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
189 #define MFC6_LOCK_ASSERT() do { \
190 mtx_assert(&mfc6_mtx, MA_OWNED); \
191 NET_ASSERT_GIANT(); \
192 } while (0)
193 #define MFC6_LOCK_INIT() \
194 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
195 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
196
197 static u_char n6expire[MF6CTBLSIZ];
198
199 static struct mif6 mif6table[MAXMIFS];
200 static int
201 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
202 {
203 struct mif6_sctl *out;
204 int error;
205
206 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
207 M_WAITOK | M_ZERO);
208 for (int i = 0; i < MAXMIFS; i++) {
209 out[i].m6_flags = mif6table[i].m6_flags;
210 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
211 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
212 if (mif6table[i].m6_ifp != NULL)
213 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
214 else
215 out[i].m6_ifp = 0;
216 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
217 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
218 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
219 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
220 }
221 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
222 free(out, M_TEMP);
223 return (error);
224 }
225 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD,
226 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
227 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
228 "netinet6/ip6_mroute.h)");
229
230 static struct mtx mif6_mtx;
231 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
232 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
233 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
234 #define MIF6_LOCK_INIT() \
235 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
236 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
237
238 #ifdef MRT6DEBUG
239 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
240 #define V_mrt6debug VNET(mrt6debug)
241 #define DEBUG_MFC 0x02
242 #define DEBUG_FORWARD 0x04
243 #define DEBUG_EXPIRE 0x08
244 #define DEBUG_XMIT 0x10
245 #define DEBUG_REG 0x20
246 #define DEBUG_PIM 0x40
247 #define DEBUG_ERR 0x80
248 #define DEBUG_ANY 0x7f
249 #define MRT6_DLOG(m, fmt, ...) \
250 if (V_mrt6debug & (m)) \
251 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
252 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
253 #else
254 #define MRT6_DLOG(m, fmt, ...)
255 #endif
256
257 static void expire_upcalls(void *);
258 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
259 #define UPCALL_EXPIRE 6 /* number of timeouts */
260
261 /*
262 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
263 */
264
265 /*
266 * 'Interfaces' associated with decapsulator (so we can tell
267 * packets that went through it from ones that get reflected
268 * by a broken gateway). Different from IPv4 register_if,
269 * these interfaces are linked into the system ifnet list,
270 * because per-interface IPv6 statistics are maintained in
271 * ifp->if_afdata. But it does not have any routes point
272 * to them. I.e., packets can't be sent this way. They
273 * only exist as a placeholder for multicast source
274 * verification.
275 */
276 static struct ifnet *multicast_register_if6;
277
278 #define ENCAP_HOPS 64
279
280 /*
281 * Private variables.
282 */
283 static mifi_t nummifs = 0;
284 static mifi_t reg_mif_num = (mifi_t)-1;
285
286 static struct pim6stat pim6stat;
287 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
288 &pim6stat, pim6stat,
289 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
290
291 #define PIM6STAT_INC(name) pim6stat.name += 1
292 VNET_DEFINE_STATIC(int, pim6);
293 #define V_pim6 VNET(pim6)
294
295 /*
296 * Hash function for a source, group entry
297 */
298 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
299 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
300 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
301 (g).s6_addr32[2] ^ (g).s6_addr32[3])
302
303 /*
304 * Find a route for a given origin IPv6 address and Multicast group address.
305 */
306 #define MF6CFIND(o, g, rt) do { \
307 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
308 rt = NULL; \
309 while (_rt) { \
310 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
311 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
312 (_rt->mf6c_stall == NULL)) { \
313 rt = _rt; \
314 break; \
315 } \
316 _rt = _rt->mf6c_next; \
317 } \
318 if (rt == NULL) { \
319 MRT6STAT_INC(mrt6s_mfc_misses); \
320 } \
321 } while (/*CONSTCOND*/ 0)
322
323 /*
324 * Macros to compute elapsed time efficiently
325 * Borrowed from Van Jacobson's scheduling code
326 * XXX: replace with timersub() ?
327 */
328 #define TV_DELTA(a, b, delta) do { \
329 int xxs; \
330 \
331 delta = (a).tv_usec - (b).tv_usec; \
332 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
333 switch (xxs) { \
334 case 2: \
335 delta += 1000000; \
336 /* FALLTHROUGH */ \
337 case 1: \
338 delta += 1000000; \
339 break; \
340 default: \
341 delta += (1000000 * xxs); \
342 } \
343 } \
344 } while (/*CONSTCOND*/ 0)
345
346 /* XXX: replace with timercmp(a, b, <) ? */
347 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
348 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
349
350 #ifdef UPCALL_TIMING
351 #define UPCALL_MAX 50
352 static u_long upcall_data[UPCALL_MAX + 1];
353 static void collate();
354 #endif /* UPCALL_TIMING */
355
356 static int ip6_mrouter_init(struct socket *, int, int);
357 static int add_m6fc(struct mf6cctl *);
358 static int add_m6if(struct mif6ctl *);
359 static int del_m6fc(struct mf6cctl *);
360 static int del_m6if(mifi_t *);
361 static int del_m6if_locked(mifi_t *);
362 static int get_mif6_cnt(struct sioc_mif_req6 *);
363 static int get_sg_cnt(struct sioc_sg_req6 *);
364
365 static struct callout expire_upcalls_ch;
366
367 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
368 int X_ip6_mrouter_done(void);
369 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
370 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
371 int X_mrt6_ioctl(u_long, caddr_t);
372
373 /*
374 * Handle MRT setsockopt commands to modify the multicast routing tables.
375 */
376 int
377 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
378 {
379 int error = 0;
380 int optval;
381 struct mif6ctl mifc;
382 struct mf6cctl mfcc;
383 mifi_t mifi;
384
385 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
386 return (EPERM);
387
388 switch (sopt->sopt_name) {
389 case MRT6_INIT:
390 #ifdef MRT6_OINIT
391 case MRT6_OINIT:
392 #endif
393 error = sooptcopyin(sopt, &optval, sizeof(optval),
394 sizeof(optval));
395 if (error)
396 break;
397 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
398 break;
399 case MRT6_DONE:
400 error = X_ip6_mrouter_done();
401 break;
402 case MRT6_ADD_MIF:
403 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
404 if (error)
405 break;
406 error = add_m6if(&mifc);
407 break;
408 case MRT6_ADD_MFC:
409 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
410 if (error)
411 break;
412 error = add_m6fc(&mfcc);
413 break;
414 case MRT6_DEL_MFC:
415 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
416 if (error)
417 break;
418 error = del_m6fc(&mfcc);
419 break;
420 case MRT6_DEL_MIF:
421 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
422 if (error)
423 break;
424 error = del_m6if(&mifi);
425 break;
426 case MRT6_PIM:
427 error = sooptcopyin(sopt, &optval, sizeof(optval),
428 sizeof(optval));
429 if (error)
430 break;
431 error = set_pim6(&optval);
432 break;
433 default:
434 error = EOPNOTSUPP;
435 break;
436 }
437
438 return (error);
439 }
440
441 /*
442 * Handle MRT getsockopt commands
443 */
444 int
445 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
446 {
447 int error = 0;
448
449 if (so != V_ip6_mrouter)
450 return (EACCES);
451
452 switch (sopt->sopt_name) {
453 case MRT6_PIM:
454 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
455 break;
456 }
457 return (error);
458 }
459
460 /*
461 * Handle ioctl commands to obtain information from the cache
462 */
463 int
464 X_mrt6_ioctl(u_long cmd, caddr_t data)
465 {
466 int ret;
467
468 ret = EINVAL;
469
470 switch (cmd) {
471 case SIOCGETSGCNT_IN6:
472 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
473 break;
474
475 case SIOCGETMIFCNT_IN6:
476 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
477 break;
478
479 default:
480 break;
481 }
482
483 return (ret);
484 }
485
486 /*
487 * returns the packet, byte, rpf-failure count for the source group provided
488 */
489 static int
490 get_sg_cnt(struct sioc_sg_req6 *req)
491 {
492 struct mf6c *rt;
493 int ret;
494
495 ret = 0;
496
497 MFC6_LOCK();
498
499 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
500 if (rt == NULL) {
501 ret = ESRCH;
502 } else {
503 req->pktcnt = rt->mf6c_pkt_cnt;
504 req->bytecnt = rt->mf6c_byte_cnt;
505 req->wrong_if = rt->mf6c_wrong_if;
506 }
507
508 MFC6_UNLOCK();
509
510 return (ret);
511 }
512
513 /*
514 * returns the input and output packet and byte counts on the mif provided
515 */
516 static int
517 get_mif6_cnt(struct sioc_mif_req6 *req)
518 {
519 mifi_t mifi;
520 int ret;
521
522 ret = 0;
523 mifi = req->mifi;
524
525 MIF6_LOCK();
526
527 if (mifi >= nummifs) {
528 ret = EINVAL;
529 } else {
530 req->icount = mif6table[mifi].m6_pkt_in;
531 req->ocount = mif6table[mifi].m6_pkt_out;
532 req->ibytes = mif6table[mifi].m6_bytes_in;
533 req->obytes = mif6table[mifi].m6_bytes_out;
534 }
535
536 MIF6_UNLOCK();
537
538 return (ret);
539 }
540
541 static int
542 set_pim6(int *i)
543 {
544 if ((*i != 1) && (*i != 0))
545 return (EINVAL);
546
547 V_pim6 = *i;
548
549 return (0);
550 }
551
552 /*
553 * Enable multicast routing
554 */
555 static int
556 ip6_mrouter_init(struct socket *so, int v, int cmd)
557 {
558
559 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
560 so->so_type, so->so_proto->pr_protocol);
561
562 if (so->so_type != SOCK_RAW ||
563 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
564 return (EOPNOTSUPP);
565
566 if (v != 1)
567 return (ENOPROTOOPT);
568
569 MROUTER6_LOCK();
570
571 if (V_ip6_mrouter != NULL) {
572 MROUTER6_UNLOCK();
573 return (EADDRINUSE);
574 }
575
576 V_ip6_mrouter = so;
577 V_ip6_mrouter_ver = cmd;
578
579 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
580 bzero((caddr_t)n6expire, sizeof(n6expire));
581
582 V_pim6 = 0;/* used for stubbing out/in pim stuff */
583
584 callout_init(&expire_upcalls_ch, 0);
585 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
586 expire_upcalls, NULL);
587
588 MROUTER6_UNLOCK();
589 MRT6_DLOG(DEBUG_ANY, "finished");
590
591 return (0);
592 }
593
594 /*
595 * Disable IPv6 multicast forwarding.
596 */
597 int
598 X_ip6_mrouter_done(void)
599 {
600 mifi_t mifi;
601 u_long i;
602 struct mf6c *rt;
603 struct rtdetq *rte;
604
605 MROUTER6_LOCK();
606
607 if (V_ip6_mrouter == NULL) {
608 MROUTER6_UNLOCK();
609 return (EINVAL);
610 }
611
612 /*
613 * For each phyint in use, disable promiscuous reception of all IPv6
614 * multicasts.
615 */
616 for (mifi = 0; mifi < nummifs; mifi++) {
617 if (mif6table[mifi].m6_ifp &&
618 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
619 if_allmulti(mif6table[mifi].m6_ifp, 0);
620 }
621 }
622 bzero((caddr_t)mif6table, sizeof(mif6table));
623 nummifs = 0;
624
625 V_pim6 = 0; /* used to stub out/in pim specific code */
626
627 callout_stop(&expire_upcalls_ch);
628
629 /*
630 * Free all multicast forwarding cache entries.
631 */
632 MFC6_LOCK();
633 for (i = 0; i < MF6CTBLSIZ; i++) {
634 rt = mf6ctable[i];
635 while (rt) {
636 struct mf6c *frt;
637
638 for (rte = rt->mf6c_stall; rte != NULL; ) {
639 struct rtdetq *n = rte->next;
640
641 m_freem(rte->m);
642 free(rte, M_MRTABLE6);
643 rte = n;
644 }
645 frt = rt;
646 rt = rt->mf6c_next;
647 free(frt, M_MRTABLE6);
648 }
649 }
650 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
651 MFC6_UNLOCK();
652
653 /*
654 * Reset register interface
655 */
656 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
657 if_detach(multicast_register_if6);
658 if_free(multicast_register_if6);
659 reg_mif_num = (mifi_t)-1;
660 multicast_register_if6 = NULL;
661 }
662
663 V_ip6_mrouter = NULL;
664 V_ip6_mrouter_ver = 0;
665
666 MROUTER6_UNLOCK();
667 MRT6_DLOG(DEBUG_ANY, "finished");
668
669 return (0);
670 }
671
672 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
673
674 /*
675 * Add a mif to the mif table
676 */
677 static int
678 add_m6if(struct mif6ctl *mifcp)
679 {
680 struct mif6 *mifp;
681 struct ifnet *ifp;
682 int error;
683
684 MIF6_LOCK();
685
686 if (mifcp->mif6c_mifi >= MAXMIFS) {
687 MIF6_UNLOCK();
688 return (EINVAL);
689 }
690 mifp = mif6table + mifcp->mif6c_mifi;
691 if (mifp->m6_ifp != NULL) {
692 MIF6_UNLOCK();
693 return (EADDRINUSE); /* XXX: is it appropriate? */
694 }
695 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
696 MIF6_UNLOCK();
697 return (ENXIO);
698 }
699
700 ifp = ifnet_byindex(mifcp->mif6c_pifi);
701
702 if (mifcp->mif6c_flags & MIFF_REGISTER) {
703 if (reg_mif_num == (mifi_t)-1) {
704 ifp = if_alloc(IFT_OTHER);
705
706 if_initname(ifp, "register_mif", 0);
707 ifp->if_flags |= IFF_LOOPBACK;
708 if_attach(ifp);
709 multicast_register_if6 = ifp;
710 reg_mif_num = mifcp->mif6c_mifi;
711 /*
712 * it is impossible to guess the ifindex of the
713 * register interface. So mif6c_pifi is automatically
714 * calculated.
715 */
716 mifcp->mif6c_pifi = ifp->if_index;
717 } else {
718 ifp = multicast_register_if6;
719 }
720 } else {
721 /* Make sure the interface supports multicast */
722 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
723 MIF6_UNLOCK();
724 return (EOPNOTSUPP);
725 }
726
727 error = if_allmulti(ifp, 1);
728 if (error) {
729 MIF6_UNLOCK();
730 return (error);
731 }
732 }
733
734 mifp->m6_flags = mifcp->mif6c_flags;
735 mifp->m6_ifp = ifp;
736
737 /* initialize per mif pkt counters */
738 mifp->m6_pkt_in = 0;
739 mifp->m6_pkt_out = 0;
740 mifp->m6_bytes_in = 0;
741 mifp->m6_bytes_out = 0;
742
743 /* Adjust nummifs up if the mifi is higher than nummifs */
744 if (nummifs <= mifcp->mif6c_mifi)
745 nummifs = mifcp->mif6c_mifi + 1;
746
747 MIF6_UNLOCK();
748 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
749 if_name(ifp));
750
751 return (0);
752 }
753
754 /*
755 * Delete a mif from the mif table
756 */
757 static int
758 del_m6if_locked(mifi_t *mifip)
759 {
760 struct mif6 *mifp = mif6table + *mifip;
761 mifi_t mifi;
762 struct ifnet *ifp;
763
764 MIF6_LOCK_ASSERT();
765
766 if (*mifip >= nummifs)
767 return (EINVAL);
768 if (mifp->m6_ifp == NULL)
769 return (EINVAL);
770
771 if (!(mifp->m6_flags & MIFF_REGISTER)) {
772 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
773 ifp = mifp->m6_ifp;
774 if_allmulti(ifp, 0);
775 } else {
776 if (reg_mif_num != (mifi_t)-1 &&
777 multicast_register_if6 != NULL) {
778 if_detach(multicast_register_if6);
779 if_free(multicast_register_if6);
780 reg_mif_num = (mifi_t)-1;
781 multicast_register_if6 = NULL;
782 }
783 }
784
785 bzero((caddr_t)mifp, sizeof(*mifp));
786
787 /* Adjust nummifs down */
788 for (mifi = nummifs; mifi > 0; mifi--)
789 if (mif6table[mifi - 1].m6_ifp)
790 break;
791 nummifs = mifi;
792 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
793
794 return (0);
795 }
796
797 static int
798 del_m6if(mifi_t *mifip)
799 {
800 int cc;
801
802 MIF6_LOCK();
803 cc = del_m6if_locked(mifip);
804 MIF6_UNLOCK();
805
806 return (cc);
807 }
808
809 /*
810 * Add an mfc entry
811 */
812 static int
813 add_m6fc(struct mf6cctl *mfccp)
814 {
815 struct mf6c *rt;
816 u_long hash;
817 struct rtdetq *rte;
818 u_short nstl;
819 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
820
821 MFC6_LOCK();
822
823 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
824 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
825
826 /* If an entry already exists, just update the fields */
827 if (rt) {
828 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
829 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
830 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
831 mfccp->mf6cc_parent);
832
833 rt->mf6c_parent = mfccp->mf6cc_parent;
834 rt->mf6c_ifset = mfccp->mf6cc_ifset;
835
836 MFC6_UNLOCK();
837 return (0);
838 }
839
840 /*
841 * Find the entry for which the upcall was made and update
842 */
843 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
844 mfccp->mf6cc_mcastgrp.sin6_addr);
845 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
846 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
847 &mfccp->mf6cc_origin.sin6_addr) &&
848 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
849 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
850 (rt->mf6c_stall != NULL)) {
851
852 if (nstl++)
853 log(LOG_ERR,
854 "add_m6fc: %s o %s g %s p %x dbx %p\n",
855 "multiple kernel entries",
856 ip6_sprintf(ip6bufo,
857 &mfccp->mf6cc_origin.sin6_addr),
858 ip6_sprintf(ip6bufg,
859 &mfccp->mf6cc_mcastgrp.sin6_addr),
860 mfccp->mf6cc_parent, rt->mf6c_stall);
861
862 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
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
869 rt->mf6c_origin = mfccp->mf6cc_origin;
870 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
871 rt->mf6c_parent = mfccp->mf6cc_parent;
872 rt->mf6c_ifset = mfccp->mf6cc_ifset;
873 /* initialize pkt counters per src-grp */
874 rt->mf6c_pkt_cnt = 0;
875 rt->mf6c_byte_cnt = 0;
876 rt->mf6c_wrong_if = 0;
877
878 rt->mf6c_expire = 0; /* Don't clean this guy up */
879 n6expire[hash]--;
880
881 /* free packets Qed at the end of this entry */
882 for (rte = rt->mf6c_stall; rte != NULL; ) {
883 struct rtdetq *n = rte->next;
884 ip6_mdq(rte->m, rte->ifp, rt);
885 m_freem(rte->m);
886 #ifdef UPCALL_TIMING
887 collate(&(rte->t));
888 #endif /* UPCALL_TIMING */
889 free(rte, M_MRTABLE6);
890 rte = n;
891 }
892 rt->mf6c_stall = NULL;
893 }
894 }
895
896 /*
897 * It is possible that an entry is being inserted without an upcall
898 */
899 if (nstl == 0) {
900 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
901 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
902 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
903 mfccp->mf6cc_parent);
904
905 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
906
907 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
908 &mfccp->mf6cc_origin.sin6_addr)&&
909 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
910 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
911
912 rt->mf6c_origin = mfccp->mf6cc_origin;
913 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
914 rt->mf6c_parent = mfccp->mf6cc_parent;
915 rt->mf6c_ifset = mfccp->mf6cc_ifset;
916 /* initialize pkt counters per src-grp */
917 rt->mf6c_pkt_cnt = 0;
918 rt->mf6c_byte_cnt = 0;
919 rt->mf6c_wrong_if = 0;
920
921 if (rt->mf6c_expire)
922 n6expire[hash]--;
923 rt->mf6c_expire = 0;
924 }
925 }
926 if (rt == NULL) {
927 /* no upcall, so make a new entry */
928 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
929 M_NOWAIT);
930 if (rt == NULL) {
931 MFC6_UNLOCK();
932 return (ENOBUFS);
933 }
934
935 /* insert new entry at head of hash chain */
936 rt->mf6c_origin = mfccp->mf6cc_origin;
937 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
938 rt->mf6c_parent = mfccp->mf6cc_parent;
939 rt->mf6c_ifset = mfccp->mf6cc_ifset;
940 /* initialize pkt counters per src-grp */
941 rt->mf6c_pkt_cnt = 0;
942 rt->mf6c_byte_cnt = 0;
943 rt->mf6c_wrong_if = 0;
944 rt->mf6c_expire = 0;
945 rt->mf6c_stall = NULL;
946
947 /* link into table */
948 rt->mf6c_next = mf6ctable[hash];
949 mf6ctable[hash] = rt;
950 }
951 }
952
953 MFC6_UNLOCK();
954 return (0);
955 }
956
957 #ifdef UPCALL_TIMING
958 /*
959 * collect delay statistics on the upcalls
960 */
961 static void
962 collate(struct timeval *t)
963 {
964 u_long d;
965 struct timeval tp;
966 u_long delta;
967
968 GET_TIME(tp);
969
970 if (TV_LT(*t, tp))
971 {
972 TV_DELTA(tp, *t, delta);
973
974 d = delta >> 10;
975 if (d > UPCALL_MAX)
976 d = UPCALL_MAX;
977
978 ++upcall_data[d];
979 }
980 }
981 #endif /* UPCALL_TIMING */
982
983 /*
984 * Delete an mfc entry
985 */
986 static int
987 del_m6fc(struct mf6cctl *mfccp)
988 {
989 #ifdef MRT6DEBUG
990 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
991 #endif
992 struct sockaddr_in6 origin;
993 struct sockaddr_in6 mcastgrp;
994 struct mf6c *rt;
995 struct mf6c **nptr;
996 u_long hash;
997
998 origin = mfccp->mf6cc_origin;
999 mcastgrp = mfccp->mf6cc_mcastgrp;
1000 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1001
1002 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
1003 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1004 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1005
1006 MFC6_LOCK();
1007
1008 nptr = &mf6ctable[hash];
1009 while ((rt = *nptr) != NULL) {
1010 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1011 &rt->mf6c_origin.sin6_addr) &&
1012 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1013 &rt->mf6c_mcastgrp.sin6_addr) &&
1014 rt->mf6c_stall == NULL)
1015 break;
1016
1017 nptr = &rt->mf6c_next;
1018 }
1019 if (rt == NULL) {
1020 MFC6_UNLOCK();
1021 return (EADDRNOTAVAIL);
1022 }
1023
1024 *nptr = rt->mf6c_next;
1025 free(rt, M_MRTABLE6);
1026
1027 MFC6_UNLOCK();
1028
1029 return (0);
1030 }
1031
1032 static int
1033 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1034 {
1035
1036 if (s) {
1037 if (sbappendaddr(&s->so_rcv,
1038 (struct sockaddr *)src,
1039 mm, (struct mbuf *)0) != 0) {
1040 sorwakeup(s);
1041 return (0);
1042 }
1043 }
1044 m_freem(mm);
1045 return (-1);
1046 }
1047
1048 /*
1049 * IPv6 multicast forwarding function. This function assumes that the packet
1050 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1051 * pointed to by "ifp", and the packet is to be relayed to other networks
1052 * that have members of the packet's destination IPv6 multicast group.
1053 *
1054 * The packet is returned unscathed to the caller, unless it is
1055 * erroneous, in which case a non-zero return value tells the caller to
1056 * discard it.
1057 *
1058 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1059 * this function is called in the originating context (i.e., not when
1060 * forwarding a packet from other node). ip6_output(), which is currently the
1061 * only function that calls this function is called in the originating context,
1062 * explicitly ensures this condition. It is caller's responsibility to ensure
1063 * that if this function is called from somewhere else in the originating
1064 * context in the future.
1065 */
1066 int
1067 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1068 {
1069 struct rtdetq *rte;
1070 struct mbuf *mb0;
1071 struct mf6c *rt;
1072 struct mif6 *mifp;
1073 struct mbuf *mm;
1074 u_long hash;
1075 mifi_t mifi;
1076 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1077 #ifdef UPCALL_TIMING
1078 struct timeval tp;
1079
1080 GET_TIME(tp);
1081 #endif /* UPCALL_TIMING */
1082
1083 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1084 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1085 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1086
1087 /*
1088 * Don't forward a packet with Hop limit of zero or one,
1089 * or a packet destined to a local-only group.
1090 */
1091 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1092 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1093 return (0);
1094 ip6->ip6_hlim--;
1095
1096 /*
1097 * Source address check: do not forward packets with unspecified
1098 * source. It was discussed in July 2000, on ipngwg mailing list.
1099 * This is rather more serious than unicast cases, because some
1100 * MLD packets can be sent with the unspecified source address
1101 * (although such packets must normally set 1 to the hop limit field).
1102 */
1103 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1104 IP6STAT_INC(ip6s_cantforward);
1105 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1106 V_ip6_log_time = time_uptime;
1107 log(LOG_DEBUG,
1108 "cannot forward "
1109 "from %s to %s nxt %d received on %s\n",
1110 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1111 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1112 ip6->ip6_nxt,
1113 if_name(m->m_pkthdr.rcvif));
1114 }
1115 return (0);
1116 }
1117
1118 MFC6_LOCK();
1119
1120 /*
1121 * Determine forwarding mifs from the forwarding cache table
1122 */
1123 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1124 MRT6STAT_INC(mrt6s_mfc_lookups);
1125
1126 /* Entry exists, so forward if necessary */
1127 if (rt) {
1128 MFC6_UNLOCK();
1129 return (ip6_mdq(m, ifp, rt));
1130 }
1131
1132 /*
1133 * If we don't have a route for packet's origin,
1134 * Make a copy of the packet & send message to routing daemon.
1135 */
1136 MRT6STAT_INC(mrt6s_no_route);
1137 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1138 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1139 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1140
1141 /*
1142 * Allocate mbufs early so that we don't do extra work if we
1143 * are just going to fail anyway.
1144 */
1145 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1146 if (rte == NULL) {
1147 MFC6_UNLOCK();
1148 return (ENOBUFS);
1149 }
1150 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1151 /*
1152 * Pullup packet header if needed before storing it,
1153 * as other references may modify it in the meantime.
1154 */
1155 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1156 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1157 if (mb0 == NULL) {
1158 free(rte, M_MRTABLE6);
1159 MFC6_UNLOCK();
1160 return (ENOBUFS);
1161 }
1162
1163 /* is there an upcall waiting for this packet? */
1164 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1165 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1166 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1167 &rt->mf6c_origin.sin6_addr) &&
1168 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1169 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1170 break;
1171 }
1172
1173 if (rt == NULL) {
1174 struct mrt6msg *im;
1175 #ifdef MRT6_OINIT
1176 struct omrt6msg *oim;
1177 #endif
1178 /* no upcall, so make a new entry */
1179 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1180 if (rt == NULL) {
1181 free(rte, M_MRTABLE6);
1182 m_freem(mb0);
1183 MFC6_UNLOCK();
1184 return (ENOBUFS);
1185 }
1186 /*
1187 * Make a copy of the header to send to the user
1188 * level process
1189 */
1190 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
1191 if (mm == NULL) {
1192 free(rte, M_MRTABLE6);
1193 m_freem(mb0);
1194 free(rt, M_MRTABLE6);
1195 MFC6_UNLOCK();
1196 return (ENOBUFS);
1197 }
1198
1199 /*
1200 * Send message to routing daemon
1201 */
1202 sin6.sin6_addr = ip6->ip6_src;
1203 im = NULL;
1204 #ifdef MRT6_OINIT
1205 oim = NULL;
1206 #endif
1207 switch (V_ip6_mrouter_ver) {
1208 #ifdef MRT6_OINIT
1209 case MRT6_OINIT:
1210 oim = mtod(mm, struct omrt6msg *);
1211 oim->im6_msgtype = MRT6MSG_NOCACHE;
1212 oim->im6_mbz = 0;
1213 break;
1214 #endif
1215 case MRT6_INIT:
1216 im = mtod(mm, struct mrt6msg *);
1217 im->im6_msgtype = MRT6MSG_NOCACHE;
1218 im->im6_mbz = 0;
1219 break;
1220 default:
1221 free(rte, M_MRTABLE6);
1222 m_freem(mb0);
1223 free(rt, M_MRTABLE6);
1224 MFC6_UNLOCK();
1225 return (EINVAL);
1226 }
1227
1228 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1229 for (mifp = mif6table, mifi = 0;
1230 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1231 ;
1232
1233 switch (V_ip6_mrouter_ver) {
1234 #ifdef MRT6_OINIT
1235 case MRT6_OINIT:
1236 oim->im6_mif = mifi;
1237 break;
1238 #endif
1239 case MRT6_INIT:
1240 im->im6_mif = mifi;
1241 break;
1242 }
1243
1244 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1245 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1246 "socket queue full\n");
1247 MRT6STAT_INC(mrt6s_upq_sockfull);
1248 free(rte, M_MRTABLE6);
1249 m_freem(mb0);
1250 free(rt, M_MRTABLE6);
1251 MFC6_UNLOCK();
1252 return (ENOBUFS);
1253 }
1254
1255 MRT6STAT_INC(mrt6s_upcalls);
1256
1257 /* insert new entry at head of hash chain */
1258 bzero(rt, sizeof(*rt));
1259 rt->mf6c_origin.sin6_family = AF_INET6;
1260 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1261 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1262 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1263 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1264 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1265 rt->mf6c_expire = UPCALL_EXPIRE;
1266 n6expire[hash]++;
1267 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1268
1269 /* link into table */
1270 rt->mf6c_next = mf6ctable[hash];
1271 mf6ctable[hash] = rt;
1272 /* Add this entry to the end of the queue */
1273 rt->mf6c_stall = rte;
1274 } else {
1275 /* determine if q has overflowed */
1276 struct rtdetq **p;
1277 int npkts = 0;
1278
1279 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1280 if (++npkts > MAX_UPQ6) {
1281 MRT6STAT_INC(mrt6s_upq_ovflw);
1282 free(rte, M_MRTABLE6);
1283 m_freem(mb0);
1284 MFC6_UNLOCK();
1285 return (0);
1286 }
1287
1288 /* Add this entry to the end of the queue */
1289 *p = rte;
1290 }
1291
1292 rte->next = NULL;
1293 rte->m = mb0;
1294 rte->ifp = ifp;
1295 #ifdef UPCALL_TIMING
1296 rte->t = tp;
1297 #endif /* UPCALL_TIMING */
1298
1299 MFC6_UNLOCK();
1300
1301 return (0);
1302 }
1303
1304 /*
1305 * Clean up cache entries if upcalls are not serviced
1306 * Call from the Slow Timeout mechanism, every half second.
1307 */
1308 static void
1309 expire_upcalls(void *unused)
1310 {
1311 #ifdef MRT6DEBUG
1312 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1313 #endif
1314 struct rtdetq *rte;
1315 struct mf6c *mfc, **nptr;
1316 u_long i;
1317
1318 MFC6_LOCK();
1319 for (i = 0; i < MF6CTBLSIZ; i++) {
1320 if (n6expire[i] == 0)
1321 continue;
1322 nptr = &mf6ctable[i];
1323 while ((mfc = *nptr) != NULL) {
1324 rte = mfc->mf6c_stall;
1325 /*
1326 * Skip real cache entries
1327 * Make sure it wasn't marked to not expire (shouldn't happen)
1328 * If it expires now
1329 */
1330 if (rte != NULL &&
1331 mfc->mf6c_expire != 0 &&
1332 --mfc->mf6c_expire == 0) {
1333 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1334 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1335 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1336 /*
1337 * drop all the packets
1338 * free the mbuf with the pkt, if, timing info
1339 */
1340 do {
1341 struct rtdetq *n = rte->next;
1342 m_freem(rte->m);
1343 free(rte, M_MRTABLE6);
1344 rte = n;
1345 } while (rte != NULL);
1346 MRT6STAT_INC(mrt6s_cache_cleanups);
1347 n6expire[i]--;
1348
1349 *nptr = mfc->mf6c_next;
1350 free(mfc, M_MRTABLE6);
1351 } else {
1352 nptr = &mfc->mf6c_next;
1353 }
1354 }
1355 }
1356 MFC6_UNLOCK();
1357 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1358 expire_upcalls, NULL);
1359 }
1360
1361 /*
1362 * Packet forwarding routine once entry in the cache is made
1363 */
1364 static int
1365 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1366 {
1367 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1368 mifi_t mifi, iif;
1369 struct mif6 *mifp;
1370 int plen = m->m_pkthdr.len;
1371 struct in6_addr src0, dst0; /* copies for local work */
1372 u_int32_t iszone, idzone, oszone, odzone;
1373 int error = 0;
1374
1375 /*
1376 * Macro to send packet on mif. Since RSVP packets don't get counted on
1377 * input, they shouldn't get counted on output, so statistics keeping is
1378 * separate.
1379 */
1380
1381 #define MC6_SEND(ip6, mifp, m) do { \
1382 if ((mifp)->m6_flags & MIFF_REGISTER) \
1383 register_send((ip6), (mifp), (m)); \
1384 else \
1385 phyint_send((ip6), (mifp), (m)); \
1386 } while (/*CONSTCOND*/ 0)
1387
1388 /*
1389 * Don't forward if it didn't arrive from the parent mif
1390 * for its origin.
1391 */
1392 mifi = rt->mf6c_parent;
1393 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1394 /* came in the wrong interface */
1395 MRT6_DLOG(DEBUG_FORWARD,
1396 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1397 mifi, mif6table[mifi].m6_ifp->if_index);
1398 MRT6STAT_INC(mrt6s_wrong_if);
1399 rt->mf6c_wrong_if++;
1400 /*
1401 * If we are doing PIM processing, and we are forwarding
1402 * packets on this interface, send a message to the
1403 * routing daemon.
1404 */
1405 /* have to make sure this is a valid mif */
1406 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1407 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1408 /*
1409 * Check the M_LOOP flag to avoid an
1410 * unnecessary PIM assert.
1411 * XXX: M_LOOP is an ad-hoc hack...
1412 */
1413 static struct sockaddr_in6 sin6 =
1414 { sizeof(sin6), AF_INET6 };
1415
1416 struct mbuf *mm;
1417 struct mrt6msg *im;
1418 #ifdef MRT6_OINIT
1419 struct omrt6msg *oim;
1420 #endif
1421
1422 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
1423 M_NOWAIT);
1424 if (mm &&
1425 (!M_WRITABLE(mm) ||
1426 mm->m_len < sizeof(struct ip6_hdr)))
1427 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1428 if (mm == NULL)
1429 return (ENOBUFS);
1430
1431 #ifdef MRT6_OINIT
1432 oim = NULL;
1433 #endif
1434 im = NULL;
1435 switch (V_ip6_mrouter_ver) {
1436 #ifdef MRT6_OINIT
1437 case MRT6_OINIT:
1438 oim = mtod(mm, struct omrt6msg *);
1439 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1440 oim->im6_mbz = 0;
1441 break;
1442 #endif
1443 case MRT6_INIT:
1444 im = mtod(mm, struct mrt6msg *);
1445 im->im6_msgtype = MRT6MSG_WRONGMIF;
1446 im->im6_mbz = 0;
1447 break;
1448 default:
1449 m_freem(mm);
1450 return (EINVAL);
1451 }
1452
1453 for (mifp = mif6table, iif = 0;
1454 iif < nummifs && mifp &&
1455 mifp->m6_ifp != ifp;
1456 mifp++, iif++)
1457 ;
1458
1459 switch (V_ip6_mrouter_ver) {
1460 #ifdef MRT6_OINIT
1461 case MRT6_OINIT:
1462 oim->im6_mif = iif;
1463 sin6.sin6_addr = oim->im6_src;
1464 break;
1465 #endif
1466 case MRT6_INIT:
1467 im->im6_mif = iif;
1468 sin6.sin6_addr = im->im6_src;
1469 break;
1470 }
1471
1472 MRT6STAT_INC(mrt6s_upcalls);
1473
1474 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1475 MRT6_DLOG(DEBUG_ANY,
1476 "ip6_mrouter socket queue full");
1477 MRT6STAT_INC(mrt6s_upq_sockfull);
1478 return (ENOBUFS);
1479 } /* if socket Q full */
1480 } /* if PIM */
1481 return (0);
1482 } /* if wrong iif */
1483
1484 /* If I sourced this packet, it counts as output, else it was input. */
1485 if (m->m_pkthdr.rcvif == NULL) {
1486 /* XXX: is rcvif really NULL when output?? */
1487 mif6table[mifi].m6_pkt_out++;
1488 mif6table[mifi].m6_bytes_out += plen;
1489 } else {
1490 mif6table[mifi].m6_pkt_in++;
1491 mif6table[mifi].m6_bytes_in += plen;
1492 }
1493 rt->mf6c_pkt_cnt++;
1494 rt->mf6c_byte_cnt += plen;
1495
1496 /*
1497 * For each mif, forward a copy of the packet if there are group
1498 * members downstream on the interface.
1499 */
1500 src0 = ip6->ip6_src;
1501 dst0 = ip6->ip6_dst;
1502 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1503 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1504 IP6STAT_INC(ip6s_badscope);
1505 return (error);
1506 }
1507 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1508 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1509 /*
1510 * check if the outgoing packet is going to break
1511 * a scope boundary.
1512 * XXX For packets through PIM register tunnel
1513 * interface, we believe a routing daemon.
1514 */
1515 if (!(mif6table[rt->mf6c_parent].m6_flags &
1516 MIFF_REGISTER) &&
1517 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1518 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1519 &oszone) ||
1520 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1521 &odzone) ||
1522 iszone != oszone ||
1523 idzone != odzone) {
1524 IP6STAT_INC(ip6s_badscope);
1525 continue;
1526 }
1527 }
1528
1529 mifp->m6_pkt_out++;
1530 mifp->m6_bytes_out += plen;
1531 MC6_SEND(ip6, mifp, m);
1532 }
1533 }
1534 return (0);
1535 }
1536
1537 static void
1538 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1539 {
1540 #ifdef MRT6DEBUG
1541 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1542 #endif
1543 struct mbuf *mb_copy;
1544 struct ifnet *ifp = mifp->m6_ifp;
1545 int error = 0;
1546 u_long linkmtu;
1547
1548 /*
1549 * Make a new reference to the packet; make sure that
1550 * the IPv6 header is actually copied, not just referenced,
1551 * so that ip6_output() only scribbles on the copy.
1552 */
1553 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1554 if (mb_copy &&
1555 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1556 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1557 if (mb_copy == NULL) {
1558 return;
1559 }
1560 /* set MCAST flag to the outgoing packet */
1561 mb_copy->m_flags |= M_MCAST;
1562
1563 /*
1564 * If we sourced the packet, call ip6_output since we may devide
1565 * the packet into fragments when the packet is too big for the
1566 * outgoing interface.
1567 * Otherwise, we can simply send the packet to the interface
1568 * sending queue.
1569 */
1570 if (m->m_pkthdr.rcvif == NULL) {
1571 struct ip6_moptions im6o;
1572
1573 im6o.im6o_multicast_ifp = ifp;
1574 /* XXX: ip6_output will override ip6->ip6_hlim */
1575 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1576 im6o.im6o_multicast_loop = 1;
1577 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1578 NULL, NULL);
1579
1580 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1581 (uint16_t)(mifp - mif6table), error);
1582 return;
1583 }
1584
1585 /*
1586 * If configured to loop back multicasts by default,
1587 * loop back a copy now.
1588 */
1589 if (in6_mcast_loop)
1590 ip6_mloopback(ifp, m);
1591
1592 /*
1593 * Put the packet into the sending queue of the outgoing interface
1594 * if it would fit in the MTU of the interface.
1595 */
1596 linkmtu = IN6_LINKMTU(ifp);
1597 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1598 struct sockaddr_in6 dst6;
1599
1600 bzero(&dst6, sizeof(dst6));
1601 dst6.sin6_len = sizeof(struct sockaddr_in6);
1602 dst6.sin6_family = AF_INET6;
1603 dst6.sin6_addr = ip6->ip6_dst;
1604
1605 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1606 /*
1607 * We just call if_output instead of nd6_output here, since
1608 * we need no ND for a multicast forwarded packet...right?
1609 */
1610 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1611 error = (*ifp->if_output)(ifp, mb_copy,
1612 (struct sockaddr *)&dst6, NULL);
1613 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1614 (uint16_t)(mifp - mif6table), error);
1615 } else {
1616 /*
1617 * pMTU discovery is intentionally disabled by default, since
1618 * various router may notify pMTU in multicast, which can be
1619 * a DDoS to a router
1620 */
1621 if (V_ip6_mcast_pmtu)
1622 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1623 else {
1624 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1625 "g %s size %d (discarded)", if_name(ifp),
1626 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1627 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1628 mb_copy->m_pkthdr.len);
1629 m_freem(mb_copy); /* simply discard the packet */
1630 }
1631 }
1632 }
1633
1634 static int
1635 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1636 {
1637 #ifdef MRT6DEBUG
1638 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1639 #endif
1640 struct mbuf *mm;
1641 int i, len = m->m_pkthdr.len;
1642 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1643 struct mrt6msg *im6;
1644
1645 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1646 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1647 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1648 PIM6STAT_INC(pim6s_snd_registers);
1649
1650 /* Make a copy of the packet to send to the user level process. */
1651 mm = m_gethdr(M_NOWAIT, MT_DATA);
1652 if (mm == NULL)
1653 return (ENOBUFS);
1654 mm->m_data += max_linkhdr;
1655 mm->m_len = sizeof(struct ip6_hdr);
1656
1657 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
1658 m_freem(mm);
1659 return (ENOBUFS);
1660 }
1661 i = MHLEN - M_LEADINGSPACE(mm);
1662 if (i > len)
1663 i = len;
1664 mm = m_pullup(mm, i);
1665 if (mm == NULL)
1666 return (ENOBUFS);
1667 /* TODO: check it! */
1668 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1669
1670 /*
1671 * Send message to routing daemon
1672 */
1673 sin6.sin6_addr = ip6->ip6_src;
1674
1675 im6 = mtod(mm, struct mrt6msg *);
1676 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1677 im6->im6_mbz = 0;
1678
1679 im6->im6_mif = mif - mif6table;
1680
1681 /* iif info is not given for reg. encap.n */
1682 MRT6STAT_INC(mrt6s_upcalls);
1683
1684 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1685 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1686 MRT6STAT_INC(mrt6s_upq_sockfull);
1687 return (ENOBUFS);
1688 }
1689 return (0);
1690 }
1691
1692 /*
1693 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1694 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1695 * into the kernel.
1696 */
1697 static int
1698 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
1699 int proto __unused, void *arg __unused)
1700 {
1701
1702 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1703 return (8); /* claim the datagram. */
1704 }
1705
1706 /*
1707 * PIM sparse mode hook
1708 * Receives the pim control messages, and passes them up to the listening
1709 * socket, using rip6_input.
1710 * The only message processed is the REGISTER pim message; the pim header
1711 * is stripped off, and the inner packet is passed to register_mforward.
1712 */
1713 static int
1714 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
1715 {
1716 struct pim *pim; /* pointer to a pim struct */
1717 struct ip6_hdr *ip6;
1718 int pimlen;
1719 int minlen;
1720
1721 PIM6STAT_INC(pim6s_rcv_total);
1722
1723 ip6 = mtod(m, struct ip6_hdr *);
1724 pimlen = m->m_pkthdr.len - off;
1725
1726 /*
1727 * Validate lengths
1728 */
1729 if (pimlen < PIM_MINLEN) {
1730 PIM6STAT_INC(pim6s_rcv_tooshort);
1731 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1732 m_freem(m);
1733 return (IPPROTO_DONE);
1734 }
1735
1736 /*
1737 * if the packet is at least as big as a REGISTER, go ahead
1738 * and grab the PIM REGISTER header size, to avoid another
1739 * possible m_pullup() later.
1740 *
1741 * PIM_MINLEN == pimhdr + u_int32 == 8
1742 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1743 */
1744 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1745
1746 /*
1747 * Make sure that the IP6 and PIM headers in contiguous memory, and
1748 * possibly the PIM REGISTER header
1749 */
1750 #ifndef PULLDOWN_TEST
1751 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1752 /* adjust pointer */
1753 ip6 = mtod(m, struct ip6_hdr *);
1754
1755 /* adjust mbuf to point to the PIM header */
1756 pim = (struct pim *)((caddr_t)ip6 + off);
1757 #else
1758 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1759 if (pim == NULL) {
1760 PIM6STAT_INC(pim6s_rcv_tooshort);
1761 return (IPPROTO_DONE);
1762 }
1763 #endif
1764
1765 #define PIM6_CHECKSUM
1766 #ifdef PIM6_CHECKSUM
1767 {
1768 int cksumlen;
1769
1770 /*
1771 * Validate checksum.
1772 * If PIM REGISTER, exclude the data packet
1773 */
1774 if (pim->pim_type == PIM_REGISTER)
1775 cksumlen = PIM_MINLEN;
1776 else
1777 cksumlen = pimlen;
1778
1779 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1780 PIM6STAT_INC(pim6s_rcv_badsum);
1781 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1782 m_freem(m);
1783 return (IPPROTO_DONE);
1784 }
1785 }
1786 #endif /* PIM_CHECKSUM */
1787
1788 /* PIM version check */
1789 if (pim->pim_ver != PIM_VERSION) {
1790 PIM6STAT_INC(pim6s_rcv_badversion);
1791 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1792 "incorrect version %d, expecting %d",
1793 pim->pim_ver, PIM_VERSION);
1794 m_freem(m);
1795 return (IPPROTO_DONE);
1796 }
1797
1798 if (pim->pim_type == PIM_REGISTER) {
1799 /*
1800 * since this is a REGISTER, we'll make a copy of the register
1801 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1802 * routing daemon.
1803 */
1804 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1805
1806 struct mbuf *mcp;
1807 struct ip6_hdr *eip6;
1808 u_int32_t *reghdr;
1809 int rc;
1810 #ifdef MRT6DEBUG
1811 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1812 #endif
1813
1814 PIM6STAT_INC(pim6s_rcv_registers);
1815
1816 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1817 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1818 reg_mif_num);
1819 m_freem(m);
1820 return (IPPROTO_DONE);
1821 }
1822
1823 reghdr = (u_int32_t *)(pim + 1);
1824
1825 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1826 goto pim6_input_to_daemon;
1827
1828 /*
1829 * Validate length
1830 */
1831 if (pimlen < PIM6_REG_MINLEN) {
1832 PIM6STAT_INC(pim6s_rcv_tooshort);
1833 PIM6STAT_INC(pim6s_rcv_badregisters);
1834 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1835 "size too small %d from %s",
1836 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1837 m_freem(m);
1838 return (IPPROTO_DONE);
1839 }
1840
1841 eip6 = (struct ip6_hdr *) (reghdr + 1);
1842 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1843 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1844 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1845 ntohs(eip6->ip6_plen));
1846
1847 /* verify the version number of the inner packet */
1848 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1849 PIM6STAT_INC(pim6s_rcv_badregisters);
1850 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1851 "of the inner packet",
1852 (eip6->ip6_vfc & IPV6_VERSION));
1853 m_freem(m);
1854 return (IPPROTO_DONE);
1855 }
1856
1857 /* verify the inner packet is destined to a mcast group */
1858 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1859 PIM6STAT_INC(pim6s_rcv_badregisters);
1860 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1861 "is not multicast %s",
1862 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1863 m_freem(m);
1864 return (IPPROTO_DONE);
1865 }
1866
1867 /*
1868 * make a copy of the whole header to pass to the daemon later.
1869 */
1870 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
1871 if (mcp == NULL) {
1872 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1873 "could not copy register head");
1874 m_freem(m);
1875 return (IPPROTO_DONE);
1876 }
1877
1878 /*
1879 * forward the inner ip6 packet; point m_data at the inner ip6.
1880 */
1881 m_adj(m, off + PIM_MINLEN);
1882 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1883 "src %s, dst %s, mif %d",
1884 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1885 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1886
1887 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1888 dst.sin6_family, 0);
1889
1890 /* prepare the register head to send to the mrouting daemon */
1891 m = mcp;
1892 }
1893
1894 /*
1895 * Pass the PIM message up to the daemon; if it is a register message
1896 * pass the 'head' only up to the daemon. This includes the
1897 * encapsulator ip6 header, pim header, register header and the
1898 * encapsulated ip6 header.
1899 */
1900 pim6_input_to_daemon:
1901 return (rip6_input(&m, &off, proto));
1902 }
1903
1904 static int
1905 ip6_mroute_modevent(module_t mod, int type, void *unused)
1906 {
1907
1908 switch (type) {
1909 case MOD_LOAD:
1910 MROUTER6_LOCK_INIT();
1911 MFC6_LOCK_INIT();
1912 MIF6_LOCK_INIT();
1913
1914 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
1915 NULL, M_WAITOK);
1916 if (pim6_encap_cookie == NULL) {
1917 printf("ip6_mroute: unable to attach pim6 encap\n");
1918 MIF6_LOCK_DESTROY();
1919 MFC6_LOCK_DESTROY();
1920 MROUTER6_LOCK_DESTROY();
1921 return (EINVAL);
1922 }
1923
1924 ip6_mforward = X_ip6_mforward;
1925 ip6_mrouter_done = X_ip6_mrouter_done;
1926 ip6_mrouter_get = X_ip6_mrouter_get;
1927 ip6_mrouter_set = X_ip6_mrouter_set;
1928 mrt6_ioctl = X_mrt6_ioctl;
1929 break;
1930
1931 case MOD_UNLOAD:
1932 if (V_ip6_mrouter != NULL)
1933 return EINVAL;
1934
1935 if (pim6_encap_cookie) {
1936 ip6_encap_detach(pim6_encap_cookie);
1937 pim6_encap_cookie = NULL;
1938 }
1939 X_ip6_mrouter_done();
1940 ip6_mforward = NULL;
1941 ip6_mrouter_done = NULL;
1942 ip6_mrouter_get = NULL;
1943 ip6_mrouter_set = NULL;
1944 mrt6_ioctl = NULL;
1945
1946 MIF6_LOCK_DESTROY();
1947 MFC6_LOCK_DESTROY();
1948 MROUTER6_LOCK_DESTROY();
1949 break;
1950
1951 default:
1952 return (EOPNOTSUPP);
1953 }
1954
1955 return (0);
1956 }
1957
1958 static moduledata_t ip6_mroutemod = {
1959 "ip6_mroute",
1960 ip6_mroute_modevent,
1961 0
1962 };
1963
1964 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);
Cache object: 8202541f8e2f25b334c236552d2d2866
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