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: stable/9/sys/netinet6/ip6_mroute.c 263070 2014-03-12 08:16:17Z brueffer $");
83
84 #include "opt_inet6.h"
85
86 #include <sys/param.h>
87 #include <sys/callout.h>
88 #include <sys/errno.h>
89 #include <sys/kernel.h>
90 #include <sys/lock.h>
91 #include <sys/malloc.h>
92 #include <sys/mbuf.h>
93 #include <sys/module.h>
94 #include <sys/domain.h>
95 #include <sys/protosw.h>
96 #include <sys/signalvar.h>
97 #include <sys/socket.h>
98 #include <sys/socketvar.h>
99 #include <sys/sockio.h>
100 #include <sys/sx.h>
101 #include <sys/sysctl.h>
102 #include <sys/syslog.h>
103 #include <sys/systm.h>
104 #include <sys/time.h>
105
106 #include <net/if.h>
107 #include <net/if_types.h>
108 #include <net/raw_cb.h>
109 #include <net/vnet.h>
110
111 #include <netinet/in.h>
112 #include <netinet/in_var.h>
113 #include <netinet/icmp6.h>
114 #include <netinet/ip_encap.h>
115
116 #include <netinet/ip6.h>
117 #include <netinet6/ip6_var.h>
118 #include <netinet6/scope6_var.h>
119 #include <netinet6/nd6.h>
120 #include <netinet6/ip6_mroute.h>
121 #include <netinet6/ip6protosw.h>
122 #include <netinet6/pim6.h>
123 #include <netinet6/pim6_var.h>
124
125 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
126
127 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
128 #define M_HASCL(m) ((m)->m_flags & M_EXT)
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 const struct ip6protosw in6_pim_protosw = {
142 .pr_type = SOCK_RAW,
143 .pr_domain = &inet6domain,
144 .pr_protocol = IPPROTO_PIM,
145 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
146 .pr_input = pim6_input,
147 .pr_output = rip6_output,
148 .pr_ctloutput = rip6_ctloutput,
149 .pr_usrreqs = &rip6_usrreqs
150 };
151 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
152
153 static VNET_DEFINE(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 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
201 &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
202 "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
203
204 static struct mtx mif6_mtx;
205 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
206 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
207 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
208 #define MIF6_LOCK_INIT() \
209 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
210 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
211
212 #ifdef MRT6DEBUG
213 static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */
214 #define V_mrt6debug VNET(mrt6debug)
215 #define DEBUG_MFC 0x02
216 #define DEBUG_FORWARD 0x04
217 #define DEBUG_EXPIRE 0x08
218 #define DEBUG_XMIT 0x10
219 #define DEBUG_REG 0x20
220 #define DEBUG_PIM 0x40
221 #define DEBUG_ERR 0x80
222 #define DEBUG_ANY 0x7f
223 #define MRT6_DLOG(m, fmt, ...) \
224 if (V_mrt6debug & (m)) \
225 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
226 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
227 #else
228 #define MRT6_DLOG(m, fmt, ...)
229 #endif
230
231 static void expire_upcalls(void *);
232 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
233 #define UPCALL_EXPIRE 6 /* number of timeouts */
234
235 /*
236 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
237 */
238
239 /*
240 * 'Interfaces' associated with decapsulator (so we can tell
241 * packets that went through it from ones that get reflected
242 * by a broken gateway). Different from IPv4 register_if,
243 * these interfaces are linked into the system ifnet list,
244 * because per-interface IPv6 statistics are maintained in
245 * ifp->if_afdata. But it does not have any routes point
246 * to them. I.e., packets can't be sent this way. They
247 * only exist as a placeholder for multicast source
248 * verification.
249 */
250 static struct ifnet *multicast_register_if6;
251
252 #define ENCAP_HOPS 64
253
254 /*
255 * Private variables.
256 */
257 static mifi_t nummifs = 0;
258 static mifi_t reg_mif_num = (mifi_t)-1;
259
260 static struct pim6stat pim6stat;
261 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
262 &pim6stat, pim6stat,
263 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
264
265 #define PIM6STAT_INC(name) pim6stat.name += 1
266 static VNET_DEFINE(int, pim6);
267 #define V_pim6 VNET(pim6)
268
269 /*
270 * Hash function for a source, group entry
271 */
272 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
273 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
274 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
275 (g).s6_addr32[2] ^ (g).s6_addr32[3])
276
277 /*
278 * Find a route for a given origin IPv6 address and Multicast group address.
279 */
280 #define MF6CFIND(o, g, rt) do { \
281 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
282 rt = NULL; \
283 while (_rt) { \
284 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
285 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
286 (_rt->mf6c_stall == NULL)) { \
287 rt = _rt; \
288 break; \
289 } \
290 _rt = _rt->mf6c_next; \
291 } \
292 if (rt == NULL) { \
293 MRT6STAT_INC(mrt6s_mfc_misses); \
294 } \
295 } while (/*CONSTCOND*/ 0)
296
297 /*
298 * Macros to compute elapsed time efficiently
299 * Borrowed from Van Jacobson's scheduling code
300 * XXX: replace with timersub() ?
301 */
302 #define TV_DELTA(a, b, delta) do { \
303 int xxs; \
304 \
305 delta = (a).tv_usec - (b).tv_usec; \
306 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
307 switch (xxs) { \
308 case 2: \
309 delta += 1000000; \
310 /* FALLTHROUGH */ \
311 case 1: \
312 delta += 1000000; \
313 break; \
314 default: \
315 delta += (1000000 * xxs); \
316 } \
317 } \
318 } while (/*CONSTCOND*/ 0)
319
320 /* XXX: replace with timercmp(a, b, <) ? */
321 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
322 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
323
324 #ifdef UPCALL_TIMING
325 #define UPCALL_MAX 50
326 static u_long upcall_data[UPCALL_MAX + 1];
327 static void collate();
328 #endif /* UPCALL_TIMING */
329
330 static int ip6_mrouter_init(struct socket *, int, int);
331 static int add_m6fc(struct mf6cctl *);
332 static int add_m6if(struct mif6ctl *);
333 static int del_m6fc(struct mf6cctl *);
334 static int del_m6if(mifi_t *);
335 static int del_m6if_locked(mifi_t *);
336 static int get_mif6_cnt(struct sioc_mif_req6 *);
337 static int get_sg_cnt(struct sioc_sg_req6 *);
338
339 static struct callout expire_upcalls_ch;
340
341 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
342 int X_ip6_mrouter_done(void);
343 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
344 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
345 int X_mrt6_ioctl(u_long, caddr_t);
346
347 /*
348 * Handle MRT setsockopt commands to modify the multicast routing tables.
349 */
350 int
X_ip6_mrouter_set(struct socket * so,struct sockopt * sopt)351 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
352 {
353 int error = 0;
354 int optval;
355 struct mif6ctl mifc;
356 struct mf6cctl mfcc;
357 mifi_t mifi;
358
359 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
360 return (EACCES);
361
362 switch (sopt->sopt_name) {
363 case MRT6_INIT:
364 #ifdef MRT6_OINIT
365 case MRT6_OINIT:
366 #endif
367 error = sooptcopyin(sopt, &optval, sizeof(optval),
368 sizeof(optval));
369 if (error)
370 break;
371 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
372 break;
373 case MRT6_DONE:
374 error = X_ip6_mrouter_done();
375 break;
376 case MRT6_ADD_MIF:
377 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
378 if (error)
379 break;
380 error = add_m6if(&mifc);
381 break;
382 case MRT6_ADD_MFC:
383 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
384 if (error)
385 break;
386 error = add_m6fc(&mfcc);
387 break;
388 case MRT6_DEL_MFC:
389 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
390 if (error)
391 break;
392 error = del_m6fc(&mfcc);
393 break;
394 case MRT6_DEL_MIF:
395 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
396 if (error)
397 break;
398 error = del_m6if(&mifi);
399 break;
400 case MRT6_PIM:
401 error = sooptcopyin(sopt, &optval, sizeof(optval),
402 sizeof(optval));
403 if (error)
404 break;
405 error = set_pim6(&optval);
406 break;
407 default:
408 error = EOPNOTSUPP;
409 break;
410 }
411
412 return (error);
413 }
414
415 /*
416 * Handle MRT getsockopt commands
417 */
418 int
X_ip6_mrouter_get(struct socket * so,struct sockopt * sopt)419 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
420 {
421 int error = 0;
422
423 if (so != V_ip6_mrouter)
424 return (EACCES);
425
426 switch (sopt->sopt_name) {
427 case MRT6_PIM:
428 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
429 break;
430 }
431 return (error);
432 }
433
434 /*
435 * Handle ioctl commands to obtain information from the cache
436 */
437 int
X_mrt6_ioctl(u_long cmd,caddr_t data)438 X_mrt6_ioctl(u_long cmd, caddr_t data)
439 {
440 int ret;
441
442 ret = EINVAL;
443
444 switch (cmd) {
445 case SIOCGETSGCNT_IN6:
446 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
447 break;
448
449 case SIOCGETMIFCNT_IN6:
450 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
451 break;
452
453 default:
454 break;
455 }
456
457 return (ret);
458 }
459
460 /*
461 * returns the packet, byte, rpf-failure count for the source group provided
462 */
463 static int
get_sg_cnt(struct sioc_sg_req6 * req)464 get_sg_cnt(struct sioc_sg_req6 *req)
465 {
466 struct mf6c *rt;
467 int ret;
468
469 ret = 0;
470
471 MFC6_LOCK();
472
473 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
474 if (rt == NULL) {
475 ret = ESRCH;
476 } else {
477 req->pktcnt = rt->mf6c_pkt_cnt;
478 req->bytecnt = rt->mf6c_byte_cnt;
479 req->wrong_if = rt->mf6c_wrong_if;
480 }
481
482 MFC6_UNLOCK();
483
484 return (ret);
485 }
486
487 /*
488 * returns the input and output packet and byte counts on the mif provided
489 */
490 static int
get_mif6_cnt(struct sioc_mif_req6 * req)491 get_mif6_cnt(struct sioc_mif_req6 *req)
492 {
493 mifi_t mifi;
494 int ret;
495
496 ret = 0;
497 mifi = req->mifi;
498
499 MIF6_LOCK();
500
501 if (mifi >= nummifs) {
502 ret = EINVAL;
503 } else {
504 req->icount = mif6table[mifi].m6_pkt_in;
505 req->ocount = mif6table[mifi].m6_pkt_out;
506 req->ibytes = mif6table[mifi].m6_bytes_in;
507 req->obytes = mif6table[mifi].m6_bytes_out;
508 }
509
510 MIF6_UNLOCK();
511
512 return (ret);
513 }
514
515 static int
set_pim6(int * i)516 set_pim6(int *i)
517 {
518 if ((*i != 1) && (*i != 0))
519 return (EINVAL);
520
521 V_pim6 = *i;
522
523 return (0);
524 }
525
526 /*
527 * Enable multicast routing
528 */
529 static int
ip6_mrouter_init(struct socket * so,int v,int cmd)530 ip6_mrouter_init(struct socket *so, int v, int cmd)
531 {
532
533 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
534 so->so_type, so->so_proto->pr_protocol);
535
536 if (so->so_type != SOCK_RAW ||
537 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
538 return (EOPNOTSUPP);
539
540 if (v != 1)
541 return (ENOPROTOOPT);
542
543 MROUTER6_LOCK();
544
545 if (V_ip6_mrouter != NULL) {
546 MROUTER6_UNLOCK();
547 return (EADDRINUSE);
548 }
549
550 V_ip6_mrouter = so;
551 V_ip6_mrouter_ver = cmd;
552
553 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
554 bzero((caddr_t)n6expire, sizeof(n6expire));
555
556 V_pim6 = 0;/* used for stubbing out/in pim stuff */
557
558 callout_init(&expire_upcalls_ch, 0);
559 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
560 expire_upcalls, NULL);
561
562 MROUTER6_UNLOCK();
563 MRT6_DLOG(DEBUG_ANY, "finished");
564
565 return (0);
566 }
567
568 /*
569 * Disable IPv6 multicast forwarding.
570 */
571 int
X_ip6_mrouter_done(void)572 X_ip6_mrouter_done(void)
573 {
574 mifi_t mifi;
575 u_long i;
576 struct mf6c *rt;
577 struct rtdetq *rte;
578
579 MROUTER6_LOCK();
580
581 if (V_ip6_mrouter == NULL) {
582 MROUTER6_UNLOCK();
583 return (EINVAL);
584 }
585
586 /*
587 * For each phyint in use, disable promiscuous reception of all IPv6
588 * multicasts.
589 */
590 for (mifi = 0; mifi < nummifs; mifi++) {
591 if (mif6table[mifi].m6_ifp &&
592 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
593 if_allmulti(mif6table[mifi].m6_ifp, 0);
594 }
595 }
596 bzero((caddr_t)mif6table, sizeof(mif6table));
597 nummifs = 0;
598
599 V_pim6 = 0; /* used to stub out/in pim specific code */
600
601 callout_stop(&expire_upcalls_ch);
602
603 /*
604 * Free all multicast forwarding cache entries.
605 */
606 MFC6_LOCK();
607 for (i = 0; i < MF6CTBLSIZ; i++) {
608 rt = mf6ctable[i];
609 while (rt) {
610 struct mf6c *frt;
611
612 for (rte = rt->mf6c_stall; rte != NULL; ) {
613 struct rtdetq *n = rte->next;
614
615 m_free(rte->m);
616 free(rte, M_MRTABLE6);
617 rte = n;
618 }
619 frt = rt;
620 rt = rt->mf6c_next;
621 free(frt, M_MRTABLE6);
622 }
623 }
624 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
625 MFC6_UNLOCK();
626
627 /*
628 * Reset register interface
629 */
630 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
631 if_detach(multicast_register_if6);
632 if_free(multicast_register_if6);
633 reg_mif_num = (mifi_t)-1;
634 multicast_register_if6 = NULL;
635 }
636
637 V_ip6_mrouter = NULL;
638 V_ip6_mrouter_ver = 0;
639
640 MROUTER6_UNLOCK();
641 MRT6_DLOG(DEBUG_ANY, "finished");
642
643 return (0);
644 }
645
646 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
647
648 /*
649 * Add a mif to the mif table
650 */
651 static int
add_m6if(struct mif6ctl * mifcp)652 add_m6if(struct mif6ctl *mifcp)
653 {
654 struct mif6 *mifp;
655 struct ifnet *ifp;
656 int error;
657
658 MIF6_LOCK();
659
660 if (mifcp->mif6c_mifi >= MAXMIFS) {
661 MIF6_UNLOCK();
662 return (EINVAL);
663 }
664 mifp = mif6table + mifcp->mif6c_mifi;
665 if (mifp->m6_ifp != NULL) {
666 MIF6_UNLOCK();
667 return (EADDRINUSE); /* XXX: is it appropriate? */
668 }
669 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
670 MIF6_UNLOCK();
671 return (ENXIO);
672 }
673
674 ifp = ifnet_byindex(mifcp->mif6c_pifi);
675
676 if (mifcp->mif6c_flags & MIFF_REGISTER) {
677 if (reg_mif_num == (mifi_t)-1) {
678 ifp = if_alloc(IFT_OTHER);
679
680 if_initname(ifp, "register_mif", 0);
681 ifp->if_flags |= IFF_LOOPBACK;
682 if_attach(ifp);
683 multicast_register_if6 = ifp;
684 reg_mif_num = mifcp->mif6c_mifi;
685 /*
686 * it is impossible to guess the ifindex of the
687 * register interface. So mif6c_pifi is automatically
688 * calculated.
689 */
690 mifcp->mif6c_pifi = ifp->if_index;
691 } else {
692 ifp = multicast_register_if6;
693 }
694 } else {
695 /* Make sure the interface supports multicast */
696 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
697 MIF6_UNLOCK();
698 return (EOPNOTSUPP);
699 }
700
701 error = if_allmulti(ifp, 1);
702 if (error) {
703 MIF6_UNLOCK();
704 return (error);
705 }
706 }
707
708 mifp->m6_flags = mifcp->mif6c_flags;
709 mifp->m6_ifp = ifp;
710
711 /* initialize per mif pkt counters */
712 mifp->m6_pkt_in = 0;
713 mifp->m6_pkt_out = 0;
714 mifp->m6_bytes_in = 0;
715 mifp->m6_bytes_out = 0;
716
717 /* Adjust nummifs up if the mifi is higher than nummifs */
718 if (nummifs <= mifcp->mif6c_mifi)
719 nummifs = mifcp->mif6c_mifi + 1;
720
721 MIF6_UNLOCK();
722 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
723 if_name(ifp));
724
725 return (0);
726 }
727
728 /*
729 * Delete a mif from the mif table
730 */
731 static int
del_m6if_locked(mifi_t * mifip)732 del_m6if_locked(mifi_t *mifip)
733 {
734 struct mif6 *mifp = mif6table + *mifip;
735 mifi_t mifi;
736 struct ifnet *ifp;
737
738 MIF6_LOCK_ASSERT();
739
740 if (*mifip >= nummifs)
741 return (EINVAL);
742 if (mifp->m6_ifp == NULL)
743 return (EINVAL);
744
745 if (!(mifp->m6_flags & MIFF_REGISTER)) {
746 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
747 ifp = mifp->m6_ifp;
748 if_allmulti(ifp, 0);
749 } else {
750 if (reg_mif_num != (mifi_t)-1 &&
751 multicast_register_if6 != NULL) {
752 if_detach(multicast_register_if6);
753 if_free(multicast_register_if6);
754 reg_mif_num = (mifi_t)-1;
755 multicast_register_if6 = NULL;
756 }
757 }
758
759 bzero((caddr_t)mifp, sizeof(*mifp));
760
761 /* Adjust nummifs down */
762 for (mifi = nummifs; mifi > 0; mifi--)
763 if (mif6table[mifi - 1].m6_ifp)
764 break;
765 nummifs = mifi;
766 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
767
768 return (0);
769 }
770
771 static int
del_m6if(mifi_t * mifip)772 del_m6if(mifi_t *mifip)
773 {
774 int cc;
775
776 MIF6_LOCK();
777 cc = del_m6if_locked(mifip);
778 MIF6_UNLOCK();
779
780 return (cc);
781 }
782
783 /*
784 * Add an mfc entry
785 */
786 static int
add_m6fc(struct mf6cctl * mfccp)787 add_m6fc(struct mf6cctl *mfccp)
788 {
789 struct mf6c *rt;
790 u_long hash;
791 struct rtdetq *rte;
792 u_short nstl;
793 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
794
795 MFC6_LOCK();
796
797 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
798 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
799
800 /* If an entry already exists, just update the fields */
801 if (rt) {
802 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
803 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
804 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
805 mfccp->mf6cc_parent);
806
807 rt->mf6c_parent = mfccp->mf6cc_parent;
808 rt->mf6c_ifset = mfccp->mf6cc_ifset;
809
810 MFC6_UNLOCK();
811 return (0);
812 }
813
814 /*
815 * Find the entry for which the upcall was made and update
816 */
817 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
818 mfccp->mf6cc_mcastgrp.sin6_addr);
819 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
820 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
821 &mfccp->mf6cc_origin.sin6_addr) &&
822 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
823 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
824 (rt->mf6c_stall != NULL)) {
825
826 if (nstl++)
827 log(LOG_ERR,
828 "add_m6fc: %s o %s g %s p %x dbx %p\n",
829 "multiple kernel entries",
830 ip6_sprintf(ip6bufo,
831 &mfccp->mf6cc_origin.sin6_addr),
832 ip6_sprintf(ip6bufg,
833 &mfccp->mf6cc_mcastgrp.sin6_addr),
834 mfccp->mf6cc_parent, rt->mf6c_stall);
835
836 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
837 ip6_sprintf(ip6bufo,
838 &mfccp->mf6cc_origin.sin6_addr),
839 ip6_sprintf(ip6bufg,
840 &mfccp->mf6cc_mcastgrp.sin6_addr),
841 mfccp->mf6cc_parent, rt->mf6c_stall);
842
843 rt->mf6c_origin = mfccp->mf6cc_origin;
844 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
845 rt->mf6c_parent = mfccp->mf6cc_parent;
846 rt->mf6c_ifset = mfccp->mf6cc_ifset;
847 /* initialize pkt counters per src-grp */
848 rt->mf6c_pkt_cnt = 0;
849 rt->mf6c_byte_cnt = 0;
850 rt->mf6c_wrong_if = 0;
851
852 rt->mf6c_expire = 0; /* Don't clean this guy up */
853 n6expire[hash]--;
854
855 /* free packets Qed at the end of this entry */
856 for (rte = rt->mf6c_stall; rte != NULL; ) {
857 struct rtdetq *n = rte->next;
858 ip6_mdq(rte->m, rte->ifp, rt);
859 m_freem(rte->m);
860 #ifdef UPCALL_TIMING
861 collate(&(rte->t));
862 #endif /* UPCALL_TIMING */
863 free(rte, M_MRTABLE6);
864 rte = n;
865 }
866 rt->mf6c_stall = NULL;
867 }
868 }
869
870 /*
871 * It is possible that an entry is being inserted without an upcall
872 */
873 if (nstl == 0) {
874 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
875 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
876 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
877 mfccp->mf6cc_parent);
878
879 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
880
881 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
882 &mfccp->mf6cc_origin.sin6_addr)&&
883 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
884 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
885
886 rt->mf6c_origin = mfccp->mf6cc_origin;
887 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
888 rt->mf6c_parent = mfccp->mf6cc_parent;
889 rt->mf6c_ifset = mfccp->mf6cc_ifset;
890 /* initialize pkt counters per src-grp */
891 rt->mf6c_pkt_cnt = 0;
892 rt->mf6c_byte_cnt = 0;
893 rt->mf6c_wrong_if = 0;
894
895 if (rt->mf6c_expire)
896 n6expire[hash]--;
897 rt->mf6c_expire = 0;
898 }
899 }
900 if (rt == NULL) {
901 /* no upcall, so make a new entry */
902 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
903 M_NOWAIT);
904 if (rt == NULL) {
905 MFC6_UNLOCK();
906 return (ENOBUFS);
907 }
908
909 /* insert new entry at head of hash chain */
910 rt->mf6c_origin = mfccp->mf6cc_origin;
911 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
912 rt->mf6c_parent = mfccp->mf6cc_parent;
913 rt->mf6c_ifset = mfccp->mf6cc_ifset;
914 /* initialize pkt counters per src-grp */
915 rt->mf6c_pkt_cnt = 0;
916 rt->mf6c_byte_cnt = 0;
917 rt->mf6c_wrong_if = 0;
918 rt->mf6c_expire = 0;
919 rt->mf6c_stall = NULL;
920
921 /* link into table */
922 rt->mf6c_next = mf6ctable[hash];
923 mf6ctable[hash] = rt;
924 }
925 }
926
927 MFC6_UNLOCK();
928 return (0);
929 }
930
931 #ifdef UPCALL_TIMING
932 /*
933 * collect delay statistics on the upcalls
934 */
935 static void
collate(struct timeval * t)936 collate(struct timeval *t)
937 {
938 u_long d;
939 struct timeval tp;
940 u_long delta;
941
942 GET_TIME(tp);
943
944 if (TV_LT(*t, tp))
945 {
946 TV_DELTA(tp, *t, delta);
947
948 d = delta >> 10;
949 if (d > UPCALL_MAX)
950 d = UPCALL_MAX;
951
952 ++upcall_data[d];
953 }
954 }
955 #endif /* UPCALL_TIMING */
956
957 /*
958 * Delete an mfc entry
959 */
960 static int
del_m6fc(struct mf6cctl * mfccp)961 del_m6fc(struct mf6cctl *mfccp)
962 {
963 #ifdef MRT6DEBUG
964 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
965 #endif
966 struct sockaddr_in6 origin;
967 struct sockaddr_in6 mcastgrp;
968 struct mf6c *rt;
969 struct mf6c **nptr;
970 u_long hash;
971
972 origin = mfccp->mf6cc_origin;
973 mcastgrp = mfccp->mf6cc_mcastgrp;
974 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
975
976 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
977 ip6_sprintf(ip6bufo, &origin.sin6_addr),
978 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
979
980 MFC6_LOCK();
981
982 nptr = &mf6ctable[hash];
983 while ((rt = *nptr) != NULL) {
984 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
985 &rt->mf6c_origin.sin6_addr) &&
986 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
987 &rt->mf6c_mcastgrp.sin6_addr) &&
988 rt->mf6c_stall == NULL)
989 break;
990
991 nptr = &rt->mf6c_next;
992 }
993 if (rt == NULL) {
994 MFC6_UNLOCK();
995 return (EADDRNOTAVAIL);
996 }
997
998 *nptr = rt->mf6c_next;
999 free(rt, M_MRTABLE6);
1000
1001 MFC6_UNLOCK();
1002
1003 return (0);
1004 }
1005
1006 static int
socket_send(struct socket * s,struct mbuf * mm,struct sockaddr_in6 * src)1007 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1008 {
1009
1010 if (s) {
1011 if (sbappendaddr(&s->so_rcv,
1012 (struct sockaddr *)src,
1013 mm, (struct mbuf *)0) != 0) {
1014 sorwakeup(s);
1015 return (0);
1016 }
1017 }
1018 m_freem(mm);
1019 return (-1);
1020 }
1021
1022 /*
1023 * IPv6 multicast forwarding function. This function assumes that the packet
1024 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1025 * pointed to by "ifp", and the packet is to be relayed to other networks
1026 * that have members of the packet's destination IPv6 multicast group.
1027 *
1028 * The packet is returned unscathed to the caller, unless it is
1029 * erroneous, in which case a non-zero return value tells the caller to
1030 * discard it.
1031 *
1032 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1033 * this function is called in the originating context (i.e., not when
1034 * forwarding a packet from other node). ip6_output(), which is currently the
1035 * only function that calls this function is called in the originating context,
1036 * explicitly ensures this condition. It is caller's responsibility to ensure
1037 * that if this function is called from somewhere else in the originating
1038 * context in the future.
1039 */
1040 int
X_ip6_mforward(struct ip6_hdr * ip6,struct ifnet * ifp,struct mbuf * m)1041 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1042 {
1043 struct rtdetq *rte;
1044 struct mbuf *mb0;
1045 struct mf6c *rt;
1046 struct mif6 *mifp;
1047 struct mbuf *mm;
1048 u_long hash;
1049 mifi_t mifi;
1050 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1051 #ifdef UPCALL_TIMING
1052 struct timeval tp;
1053
1054 GET_TIME(tp);
1055 #endif /* UPCALL_TIMING */
1056
1057 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1058 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1059 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1060
1061 /*
1062 * Don't forward a packet with Hop limit of zero or one,
1063 * or a packet destined to a local-only group.
1064 */
1065 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1066 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1067 return (0);
1068 ip6->ip6_hlim--;
1069
1070 /*
1071 * Source address check: do not forward packets with unspecified
1072 * source. It was discussed in July 2000, on ipngwg mailing list.
1073 * This is rather more serious than unicast cases, because some
1074 * MLD packets can be sent with the unspecified source address
1075 * (although such packets must normally set 1 to the hop limit field).
1076 */
1077 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1078 IP6STAT_INC(ip6s_cantforward);
1079 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
1080 V_ip6_log_time = time_second;
1081 log(LOG_DEBUG,
1082 "cannot forward "
1083 "from %s to %s nxt %d received on %s\n",
1084 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1085 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1086 ip6->ip6_nxt,
1087 if_name(m->m_pkthdr.rcvif));
1088 }
1089 return (0);
1090 }
1091
1092 MFC6_LOCK();
1093
1094 /*
1095 * Determine forwarding mifs from the forwarding cache table
1096 */
1097 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1098 MRT6STAT_INC(mrt6s_mfc_lookups);
1099
1100 /* Entry exists, so forward if necessary */
1101 if (rt) {
1102 MFC6_UNLOCK();
1103 return (ip6_mdq(m, ifp, rt));
1104 }
1105
1106 /*
1107 * If we don't have a route for packet's origin,
1108 * Make a copy of the packet & send message to routing daemon.
1109 */
1110 MRT6STAT_INC(mrt6s_no_route);
1111 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1112 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1113 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1114
1115 /*
1116 * Allocate mbufs early so that we don't do extra work if we
1117 * are just going to fail anyway.
1118 */
1119 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1120 if (rte == NULL) {
1121 MFC6_UNLOCK();
1122 return (ENOBUFS);
1123 }
1124 mb0 = m_copy(m, 0, M_COPYALL);
1125 /*
1126 * Pullup packet header if needed before storing it,
1127 * as other references may modify it in the meantime.
1128 */
1129 if (mb0 && (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1130 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1131 if (mb0 == NULL) {
1132 free(rte, M_MRTABLE6);
1133 MFC6_UNLOCK();
1134 return (ENOBUFS);
1135 }
1136
1137 /* is there an upcall waiting for this packet? */
1138 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1139 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1140 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1141 &rt->mf6c_origin.sin6_addr) &&
1142 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1143 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1144 break;
1145 }
1146
1147 if (rt == NULL) {
1148 struct mrt6msg *im;
1149 #ifdef MRT6_OINIT
1150 struct omrt6msg *oim;
1151 #endif
1152 /* no upcall, so make a new entry */
1153 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1154 if (rt == NULL) {
1155 free(rte, M_MRTABLE6);
1156 m_freem(mb0);
1157 MFC6_UNLOCK();
1158 return (ENOBUFS);
1159 }
1160 /*
1161 * Make a copy of the header to send to the user
1162 * level process
1163 */
1164 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1165 if (mm == NULL) {
1166 free(rte, M_MRTABLE6);
1167 m_freem(mb0);
1168 free(rt, M_MRTABLE6);
1169 MFC6_UNLOCK();
1170 return (ENOBUFS);
1171 }
1172
1173 /*
1174 * Send message to routing daemon
1175 */
1176 sin6.sin6_addr = ip6->ip6_src;
1177 im = NULL;
1178 #ifdef MRT6_OINIT
1179 oim = NULL;
1180 #endif
1181 switch (V_ip6_mrouter_ver) {
1182 #ifdef MRT6_OINIT
1183 case MRT6_OINIT:
1184 oim = mtod(mm, struct omrt6msg *);
1185 oim->im6_msgtype = MRT6MSG_NOCACHE;
1186 oim->im6_mbz = 0;
1187 break;
1188 #endif
1189 case MRT6_INIT:
1190 im = mtod(mm, struct mrt6msg *);
1191 im->im6_msgtype = MRT6MSG_NOCACHE;
1192 im->im6_mbz = 0;
1193 break;
1194 default:
1195 free(rte, M_MRTABLE6);
1196 m_freem(mb0);
1197 free(rt, M_MRTABLE6);
1198 MFC6_UNLOCK();
1199 return (EINVAL);
1200 }
1201
1202 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1203 for (mifp = mif6table, mifi = 0;
1204 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1205 ;
1206
1207 switch (V_ip6_mrouter_ver) {
1208 #ifdef MRT6_OINIT
1209 case MRT6_OINIT:
1210 oim->im6_mif = mifi;
1211 break;
1212 #endif
1213 case MRT6_INIT:
1214 im->im6_mif = mifi;
1215 break;
1216 }
1217
1218 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1219 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1220 "socket queue full\n");
1221 MRT6STAT_INC(mrt6s_upq_sockfull);
1222 free(rte, M_MRTABLE6);
1223 m_freem(mb0);
1224 free(rt, M_MRTABLE6);
1225 MFC6_UNLOCK();
1226 return (ENOBUFS);
1227 }
1228
1229 MRT6STAT_INC(mrt6s_upcalls);
1230
1231 /* insert new entry at head of hash chain */
1232 bzero(rt, sizeof(*rt));
1233 rt->mf6c_origin.sin6_family = AF_INET6;
1234 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1235 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1236 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1237 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1238 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1239 rt->mf6c_expire = UPCALL_EXPIRE;
1240 n6expire[hash]++;
1241 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1242
1243 /* link into table */
1244 rt->mf6c_next = mf6ctable[hash];
1245 mf6ctable[hash] = rt;
1246 /* Add this entry to the end of the queue */
1247 rt->mf6c_stall = rte;
1248 } else {
1249 /* determine if q has overflowed */
1250 struct rtdetq **p;
1251 int npkts = 0;
1252
1253 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1254 if (++npkts > MAX_UPQ6) {
1255 MRT6STAT_INC(mrt6s_upq_ovflw);
1256 free(rte, M_MRTABLE6);
1257 m_freem(mb0);
1258 MFC6_UNLOCK();
1259 return (0);
1260 }
1261
1262 /* Add this entry to the end of the queue */
1263 *p = rte;
1264 }
1265
1266 rte->next = NULL;
1267 rte->m = mb0;
1268 rte->ifp = ifp;
1269 #ifdef UPCALL_TIMING
1270 rte->t = tp;
1271 #endif /* UPCALL_TIMING */
1272
1273 MFC6_UNLOCK();
1274
1275 return (0);
1276 }
1277
1278 /*
1279 * Clean up cache entries if upcalls are not serviced
1280 * Call from the Slow Timeout mechanism, every half second.
1281 */
1282 static void
expire_upcalls(void * unused)1283 expire_upcalls(void *unused)
1284 {
1285 #ifdef MRT6DEBUG
1286 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1287 #endif
1288 struct rtdetq *rte;
1289 struct mf6c *mfc, **nptr;
1290 u_long i;
1291
1292 MFC6_LOCK();
1293 for (i = 0; i < MF6CTBLSIZ; i++) {
1294 if (n6expire[i] == 0)
1295 continue;
1296 nptr = &mf6ctable[i];
1297 while ((mfc = *nptr) != NULL) {
1298 rte = mfc->mf6c_stall;
1299 /*
1300 * Skip real cache entries
1301 * Make sure it wasn't marked to not expire (shouldn't happen)
1302 * If it expires now
1303 */
1304 if (rte != NULL &&
1305 mfc->mf6c_expire != 0 &&
1306 --mfc->mf6c_expire == 0) {
1307 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1308 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1309 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1310 /*
1311 * drop all the packets
1312 * free the mbuf with the pkt, if, timing info
1313 */
1314 do {
1315 struct rtdetq *n = rte->next;
1316 m_freem(rte->m);
1317 free(rte, M_MRTABLE6);
1318 rte = n;
1319 } while (rte != NULL);
1320 MRT6STAT_INC(mrt6s_cache_cleanups);
1321 n6expire[i]--;
1322
1323 *nptr = mfc->mf6c_next;
1324 free(mfc, M_MRTABLE6);
1325 } else {
1326 nptr = &mfc->mf6c_next;
1327 }
1328 }
1329 }
1330 MFC6_UNLOCK();
1331 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1332 expire_upcalls, NULL);
1333 }
1334
1335 /*
1336 * Packet forwarding routine once entry in the cache is made
1337 */
1338 static int
ip6_mdq(struct mbuf * m,struct ifnet * ifp,struct mf6c * rt)1339 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1340 {
1341 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1342 mifi_t mifi, iif;
1343 struct mif6 *mifp;
1344 int plen = m->m_pkthdr.len;
1345 struct in6_addr src0, dst0; /* copies for local work */
1346 u_int32_t iszone, idzone, oszone, odzone;
1347 int error = 0;
1348
1349 /*
1350 * Macro to send packet on mif. Since RSVP packets don't get counted on
1351 * input, they shouldn't get counted on output, so statistics keeping is
1352 * separate.
1353 */
1354
1355 #define MC6_SEND(ip6, mifp, m) do { \
1356 if ((mifp)->m6_flags & MIFF_REGISTER) \
1357 register_send((ip6), (mifp), (m)); \
1358 else \
1359 phyint_send((ip6), (mifp), (m)); \
1360 } while (/*CONSTCOND*/ 0)
1361
1362 /*
1363 * Don't forward if it didn't arrive from the parent mif
1364 * for its origin.
1365 */
1366 mifi = rt->mf6c_parent;
1367 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1368 /* came in the wrong interface */
1369 MRT6_DLOG(DEBUG_FORWARD,
1370 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1371 mifi, mif6table[mifi].m6_ifp->if_index);
1372 MRT6STAT_INC(mrt6s_wrong_if);
1373 rt->mf6c_wrong_if++;
1374 /*
1375 * If we are doing PIM processing, and we are forwarding
1376 * packets on this interface, send a message to the
1377 * routing daemon.
1378 */
1379 /* have to make sure this is a valid mif */
1380 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1381 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1382 /*
1383 * Check the M_LOOP flag to avoid an
1384 * unnecessary PIM assert.
1385 * XXX: M_LOOP is an ad-hoc hack...
1386 */
1387 static struct sockaddr_in6 sin6 =
1388 { sizeof(sin6), AF_INET6 };
1389
1390 struct mbuf *mm;
1391 struct mrt6msg *im;
1392 #ifdef MRT6_OINIT
1393 struct omrt6msg *oim;
1394 #endif
1395
1396 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1397 if (mm &&
1398 (M_HASCL(mm) ||
1399 mm->m_len < sizeof(struct ip6_hdr)))
1400 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1401 if (mm == NULL)
1402 return (ENOBUFS);
1403
1404 #ifdef MRT6_OINIT
1405 oim = NULL;
1406 #endif
1407 im = NULL;
1408 switch (V_ip6_mrouter_ver) {
1409 #ifdef MRT6_OINIT
1410 case MRT6_OINIT:
1411 oim = mtod(mm, struct omrt6msg *);
1412 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1413 oim->im6_mbz = 0;
1414 break;
1415 #endif
1416 case MRT6_INIT:
1417 im = mtod(mm, struct mrt6msg *);
1418 im->im6_msgtype = MRT6MSG_WRONGMIF;
1419 im->im6_mbz = 0;
1420 break;
1421 default:
1422 m_freem(mm);
1423 return (EINVAL);
1424 }
1425
1426 for (mifp = mif6table, iif = 0;
1427 iif < nummifs && mifp &&
1428 mifp->m6_ifp != ifp;
1429 mifp++, iif++)
1430 ;
1431
1432 switch (V_ip6_mrouter_ver) {
1433 #ifdef MRT6_OINIT
1434 case MRT6_OINIT:
1435 oim->im6_mif = iif;
1436 sin6.sin6_addr = oim->im6_src;
1437 break;
1438 #endif
1439 case MRT6_INIT:
1440 im->im6_mif = iif;
1441 sin6.sin6_addr = im->im6_src;
1442 break;
1443 }
1444
1445 MRT6STAT_INC(mrt6s_upcalls);
1446
1447 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1448 MRT6_DLOG(DEBUG_ANY,
1449 "ip6_mrouter socket queue full");
1450 MRT6STAT_INC(mrt6s_upq_sockfull);
1451 return (ENOBUFS);
1452 } /* if socket Q full */
1453 } /* if PIM */
1454 return (0);
1455 } /* if wrong iif */
1456
1457 /* If I sourced this packet, it counts as output, else it was input. */
1458 if (m->m_pkthdr.rcvif == NULL) {
1459 /* XXX: is rcvif really NULL when output?? */
1460 mif6table[mifi].m6_pkt_out++;
1461 mif6table[mifi].m6_bytes_out += plen;
1462 } else {
1463 mif6table[mifi].m6_pkt_in++;
1464 mif6table[mifi].m6_bytes_in += plen;
1465 }
1466 rt->mf6c_pkt_cnt++;
1467 rt->mf6c_byte_cnt += plen;
1468
1469 /*
1470 * For each mif, forward a copy of the packet if there are group
1471 * members downstream on the interface.
1472 */
1473 src0 = ip6->ip6_src;
1474 dst0 = ip6->ip6_dst;
1475 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1476 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1477 IP6STAT_INC(ip6s_badscope);
1478 return (error);
1479 }
1480 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1481 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1482 /*
1483 * check if the outgoing packet is going to break
1484 * a scope boundary.
1485 * XXX For packets through PIM register tunnel
1486 * interface, we believe a routing daemon.
1487 */
1488 if (!(mif6table[rt->mf6c_parent].m6_flags &
1489 MIFF_REGISTER) &&
1490 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1491 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1492 &oszone) ||
1493 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1494 &odzone) ||
1495 iszone != oszone ||
1496 idzone != odzone) {
1497 IP6STAT_INC(ip6s_badscope);
1498 continue;
1499 }
1500 }
1501
1502 mifp->m6_pkt_out++;
1503 mifp->m6_bytes_out += plen;
1504 MC6_SEND(ip6, mifp, m);
1505 }
1506 }
1507 return (0);
1508 }
1509
1510 static void
phyint_send(struct ip6_hdr * ip6,struct mif6 * mifp,struct mbuf * m)1511 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1512 {
1513 #ifdef MRT6DEBUG
1514 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1515 #endif
1516 struct mbuf *mb_copy;
1517 struct ifnet *ifp = mifp->m6_ifp;
1518 int error = 0;
1519 u_long linkmtu;
1520
1521 /*
1522 * Make a new reference to the packet; make sure that
1523 * the IPv6 header is actually copied, not just referenced,
1524 * so that ip6_output() only scribbles on the copy.
1525 */
1526 mb_copy = m_copy(m, 0, M_COPYALL);
1527 if (mb_copy &&
1528 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1529 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1530 if (mb_copy == NULL) {
1531 return;
1532 }
1533 /* set MCAST flag to the outgoing packet */
1534 mb_copy->m_flags |= M_MCAST;
1535
1536 /*
1537 * If we sourced the packet, call ip6_output since we may devide
1538 * the packet into fragments when the packet is too big for the
1539 * outgoing interface.
1540 * Otherwise, we can simply send the packet to the interface
1541 * sending queue.
1542 */
1543 if (m->m_pkthdr.rcvif == NULL) {
1544 struct ip6_moptions im6o;
1545
1546 im6o.im6o_multicast_ifp = ifp;
1547 /* XXX: ip6_output will override ip6->ip6_hlim */
1548 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1549 im6o.im6o_multicast_loop = 1;
1550 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1551 NULL, NULL);
1552
1553 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1554 (uint16_t)(mifp - mif6table), error);
1555 return;
1556 }
1557
1558 /*
1559 * If configured to loop back multicasts by default,
1560 * loop back a copy now.
1561 */
1562 if (in6_mcast_loop) {
1563 struct sockaddr_in6 dst6;
1564
1565 bzero(&dst6, sizeof(dst6));
1566 dst6.sin6_len = sizeof(struct sockaddr_in6);
1567 dst6.sin6_family = AF_INET6;
1568 dst6.sin6_addr = ip6->ip6_dst;
1569 ip6_mloopback(ifp, m, &dst6);
1570 }
1571
1572 /*
1573 * Put the packet into the sending queue of the outgoing interface
1574 * if it would fit in the MTU of the interface.
1575 */
1576 linkmtu = IN6_LINKMTU(ifp);
1577 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1578 struct sockaddr_in6 dst6;
1579
1580 bzero(&dst6, sizeof(dst6));
1581 dst6.sin6_len = sizeof(struct sockaddr_in6);
1582 dst6.sin6_family = AF_INET6;
1583 dst6.sin6_addr = ip6->ip6_dst;
1584 /*
1585 * We just call if_output instead of nd6_output here, since
1586 * we need no ND for a multicast forwarded packet...right?
1587 */
1588 error = (*ifp->if_output)(ifp, mb_copy,
1589 (struct sockaddr *)&dst6, NULL);
1590 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1591 (uint16_t)(mifp - mif6table), error);
1592 } else {
1593 /*
1594 * pMTU discovery is intentionally disabled by default, since
1595 * various router may notify pMTU in multicast, which can be
1596 * a DDoS to a router
1597 */
1598 if (V_ip6_mcast_pmtu)
1599 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1600 else {
1601 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1602 "g %s size %d (discarded)", if_name(ifp),
1603 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1604 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1605 mb_copy->m_pkthdr.len);
1606 m_freem(mb_copy); /* simply discard the packet */
1607 }
1608 }
1609 }
1610
1611 static int
register_send(struct ip6_hdr * ip6,struct mif6 * mif,struct mbuf * m)1612 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1613 {
1614 #ifdef MRT6DEBUG
1615 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1616 #endif
1617 struct mbuf *mm;
1618 int i, len = m->m_pkthdr.len;
1619 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1620 struct mrt6msg *im6;
1621
1622 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1623 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1624 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1625 PIM6STAT_INC(pim6s_snd_registers);
1626
1627 /* Make a copy of the packet to send to the user level process */
1628 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1629 if (mm == NULL)
1630 return (ENOBUFS);
1631 mm->m_pkthdr.rcvif = NULL;
1632 mm->m_data += max_linkhdr;
1633 mm->m_len = sizeof(struct ip6_hdr);
1634
1635 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1636 m_freem(mm);
1637 return (ENOBUFS);
1638 }
1639 i = MHLEN - M_LEADINGSPACE(mm);
1640 if (i > len)
1641 i = len;
1642 mm = m_pullup(mm, i);
1643 if (mm == NULL)
1644 return (ENOBUFS);
1645 /* TODO: check it! */
1646 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1647
1648 /*
1649 * Send message to routing daemon
1650 */
1651 sin6.sin6_addr = ip6->ip6_src;
1652
1653 im6 = mtod(mm, struct mrt6msg *);
1654 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1655 im6->im6_mbz = 0;
1656
1657 im6->im6_mif = mif - mif6table;
1658
1659 /* iif info is not given for reg. encap.n */
1660 MRT6STAT_INC(mrt6s_upcalls);
1661
1662 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1663 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1664 MRT6STAT_INC(mrt6s_upq_sockfull);
1665 return (ENOBUFS);
1666 }
1667 return (0);
1668 }
1669
1670 /*
1671 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1672 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1673 * into the kernel.
1674 */
1675 static int
pim6_encapcheck(const struct mbuf * m,int off,int proto,void * arg)1676 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1677 {
1678
1679 #ifdef DIAGNOSTIC
1680 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1681 #endif
1682 if (proto != IPPROTO_PIM)
1683 return 0; /* not for us; reject the datagram. */
1684
1685 return 64; /* claim the datagram. */
1686 }
1687
1688 /*
1689 * PIM sparse mode hook
1690 * Receives the pim control messages, and passes them up to the listening
1691 * socket, using rip6_input.
1692 * The only message processed is the REGISTER pim message; the pim header
1693 * is stripped off, and the inner packet is passed to register_mforward.
1694 */
1695 int
pim6_input(struct mbuf ** mp,int * offp,int proto)1696 pim6_input(struct mbuf **mp, int *offp, int proto)
1697 {
1698 struct pim *pim; /* pointer to a pim struct */
1699 struct ip6_hdr *ip6;
1700 int pimlen;
1701 struct mbuf *m = *mp;
1702 int minlen;
1703 int off = *offp;
1704
1705 PIM6STAT_INC(pim6s_rcv_total);
1706
1707 ip6 = mtod(m, struct ip6_hdr *);
1708 pimlen = m->m_pkthdr.len - *offp;
1709
1710 /*
1711 * Validate lengths
1712 */
1713 if (pimlen < PIM_MINLEN) {
1714 PIM6STAT_INC(pim6s_rcv_tooshort);
1715 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1716 m_freem(m);
1717 return (IPPROTO_DONE);
1718 }
1719
1720 /*
1721 * if the packet is at least as big as a REGISTER, go ahead
1722 * and grab the PIM REGISTER header size, to avoid another
1723 * possible m_pullup() later.
1724 *
1725 * PIM_MINLEN == pimhdr + u_int32 == 8
1726 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1727 */
1728 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1729
1730 /*
1731 * Make sure that the IP6 and PIM headers in contiguous memory, and
1732 * possibly the PIM REGISTER header
1733 */
1734 #ifndef PULLDOWN_TEST
1735 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1736 /* adjust pointer */
1737 ip6 = mtod(m, struct ip6_hdr *);
1738
1739 /* adjust mbuf to point to the PIM header */
1740 pim = (struct pim *)((caddr_t)ip6 + off);
1741 #else
1742 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1743 if (pim == NULL) {
1744 PIM6STAT_INC(pim6s_rcv_tooshort);
1745 return (IPPROTO_DONE);
1746 }
1747 #endif
1748
1749 #define PIM6_CHECKSUM
1750 #ifdef PIM6_CHECKSUM
1751 {
1752 int cksumlen;
1753
1754 /*
1755 * Validate checksum.
1756 * If PIM REGISTER, exclude the data packet
1757 */
1758 if (pim->pim_type == PIM_REGISTER)
1759 cksumlen = PIM_MINLEN;
1760 else
1761 cksumlen = pimlen;
1762
1763 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1764 PIM6STAT_INC(pim6s_rcv_badsum);
1765 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1766 m_freem(m);
1767 return (IPPROTO_DONE);
1768 }
1769 }
1770 #endif /* PIM_CHECKSUM */
1771
1772 /* PIM version check */
1773 if (pim->pim_ver != PIM_VERSION) {
1774 PIM6STAT_INC(pim6s_rcv_badversion);
1775 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1776 "incorrect version %d, expecting %d",
1777 pim->pim_ver, PIM_VERSION);
1778 m_freem(m);
1779 return (IPPROTO_DONE);
1780 }
1781
1782 if (pim->pim_type == PIM_REGISTER) {
1783 /*
1784 * since this is a REGISTER, we'll make a copy of the register
1785 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1786 * routing daemon.
1787 */
1788 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1789
1790 struct mbuf *mcp;
1791 struct ip6_hdr *eip6;
1792 u_int32_t *reghdr;
1793 int rc;
1794 #ifdef MRT6DEBUG
1795 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1796 #endif
1797
1798 PIM6STAT_INC(pim6s_rcv_registers);
1799
1800 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1801 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1802 reg_mif_num);
1803 m_freem(m);
1804 return (IPPROTO_DONE);
1805 }
1806
1807 reghdr = (u_int32_t *)(pim + 1);
1808
1809 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1810 goto pim6_input_to_daemon;
1811
1812 /*
1813 * Validate length
1814 */
1815 if (pimlen < PIM6_REG_MINLEN) {
1816 PIM6STAT_INC(pim6s_rcv_tooshort);
1817 PIM6STAT_INC(pim6s_rcv_badregisters);
1818 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1819 "size too small %d from %s",
1820 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1821 m_freem(m);
1822 return (IPPROTO_DONE);
1823 }
1824
1825 eip6 = (struct ip6_hdr *) (reghdr + 1);
1826 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1827 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1828 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1829 ntohs(eip6->ip6_plen));
1830
1831 /* verify the version number of the inner packet */
1832 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1833 PIM6STAT_INC(pim6s_rcv_badregisters);
1834 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1835 "of the inner packet",
1836 (eip6->ip6_vfc & IPV6_VERSION));
1837 m_freem(m);
1838 return (IPPROTO_NONE);
1839 }
1840
1841 /* verify the inner packet is destined to a mcast group */
1842 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1843 PIM6STAT_INC(pim6s_rcv_badregisters);
1844 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1845 "is not multicast %s",
1846 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1847 m_freem(m);
1848 return (IPPROTO_DONE);
1849 }
1850
1851 /*
1852 * make a copy of the whole header to pass to the daemon later.
1853 */
1854 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1855 if (mcp == NULL) {
1856 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1857 "could not copy register head");
1858 m_freem(m);
1859 return (IPPROTO_DONE);
1860 }
1861
1862 /*
1863 * forward the inner ip6 packet; point m_data at the inner ip6.
1864 */
1865 m_adj(m, off + PIM_MINLEN);
1866 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1867 "src %s, dst %s, mif %d",
1868 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1869 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1870
1871 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1872 dst.sin6_family, 0);
1873
1874 /* prepare the register head to send to the mrouting daemon */
1875 m = mcp;
1876 }
1877
1878 /*
1879 * Pass the PIM message up to the daemon; if it is a register message
1880 * pass the 'head' only up to the daemon. This includes the
1881 * encapsulator ip6 header, pim header, register header and the
1882 * encapsulated ip6 header.
1883 */
1884 pim6_input_to_daemon:
1885 rip6_input(&m, offp, proto);
1886 return (IPPROTO_DONE);
1887 }
1888
1889 static int
ip6_mroute_modevent(module_t mod,int type,void * unused)1890 ip6_mroute_modevent(module_t mod, int type, void *unused)
1891 {
1892
1893 switch (type) {
1894 case MOD_LOAD:
1895 MROUTER6_LOCK_INIT();
1896 MFC6_LOCK_INIT();
1897 MIF6_LOCK_INIT();
1898
1899 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
1900 pim6_encapcheck,
1901 (const struct protosw *)&in6_pim_protosw, NULL);
1902 if (pim6_encap_cookie == NULL) {
1903 printf("ip6_mroute: unable to attach pim6 encap\n");
1904 MIF6_LOCK_DESTROY();
1905 MFC6_LOCK_DESTROY();
1906 MROUTER6_LOCK_DESTROY();
1907 return (EINVAL);
1908 }
1909
1910 ip6_mforward = X_ip6_mforward;
1911 ip6_mrouter_done = X_ip6_mrouter_done;
1912 ip6_mrouter_get = X_ip6_mrouter_get;
1913 ip6_mrouter_set = X_ip6_mrouter_set;
1914 mrt6_ioctl = X_mrt6_ioctl;
1915 break;
1916
1917 case MOD_UNLOAD:
1918 if (V_ip6_mrouter != NULL)
1919 return EINVAL;
1920
1921 if (pim6_encap_cookie) {
1922 encap_detach(pim6_encap_cookie);
1923 pim6_encap_cookie = NULL;
1924 }
1925 X_ip6_mrouter_done();
1926 ip6_mforward = NULL;
1927 ip6_mrouter_done = NULL;
1928 ip6_mrouter_get = NULL;
1929 ip6_mrouter_set = NULL;
1930 mrt6_ioctl = NULL;
1931
1932 MIF6_LOCK_DESTROY();
1933 MFC6_LOCK_DESTROY();
1934 MROUTER6_LOCK_DESTROY();
1935 break;
1936
1937 default:
1938 return (EOPNOTSUPP);
1939 }
1940
1941 return (0);
1942 }
1943
1944 static moduledata_t ip6_mroutemod = {
1945 "ip6_mroute",
1946 ip6_mroute_modevent,
1947 0
1948 };
1949
1950 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);
1951