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("$FreeBSD$");
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 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
153 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
154
155 SYSCTL_DECL(_net_inet6);
156 SYSCTL_DECL(_net_inet6_ip6);
157 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
158 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
159 "PIM");
160
161 static struct mrt6stat mrt6stat;
162 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
163 &mrt6stat, mrt6stat,
164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
165
166 #define MRT6STAT_INC(name) mrt6stat.name += 1
167 #define NO_RTE_FOUND 0x1
168 #define RTE_FOUND 0x2
169
170 static struct mtx mrouter6_mtx;
171 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
172 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
173 #define MROUTER6_LOCK_ASSERT() do { \
174 mtx_assert(&mrouter6_mtx, MA_OWNED); \
175 NET_ASSERT_GIANT(); \
176 } while (0)
177 #define MROUTER6_LOCK_INIT() \
178 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
179 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
180
181 static struct mf6c *mf6ctable[MF6CTBLSIZ];
182 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
183 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
184 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
185 "netinet6/ip6_mroute.h)");
186
187 static struct mtx mfc6_mtx;
188 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
189 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
190 #define MFC6_LOCK_ASSERT() do { \
191 mtx_assert(&mfc6_mtx, MA_OWNED); \
192 NET_ASSERT_GIANT(); \
193 } while (0)
194 #define MFC6_LOCK_INIT() \
195 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
196 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
197
198 static u_char n6expire[MF6CTBLSIZ];
199
200 static struct mif6 mif6table[MAXMIFS];
201 static int
sysctl_mif6table(SYSCTL_HANDLER_ARGS)202 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
203 {
204 struct mif6_sctl *out;
205 int error;
206
207 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
208 M_WAITOK | M_ZERO);
209 for (int i = 0; i < MAXMIFS; i++) {
210 out[i].m6_flags = mif6table[i].m6_flags;
211 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
212 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
213 if (mif6table[i].m6_ifp != NULL)
214 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
215 else
216 out[i].m6_ifp = 0;
217 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
218 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
219 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
220 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
221 }
222 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
223 free(out, M_TEMP);
224 return (error);
225 }
226 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
227 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
228 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
229 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
230 "netinet6/ip6_mroute.h)");
231
232 static struct mtx mif6_mtx;
233 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
234 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
235 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
236 #define MIF6_LOCK_INIT() \
237 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
238 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
239
240 #ifdef MRT6DEBUG
241 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
242 #define V_mrt6debug VNET(mrt6debug)
243 #define DEBUG_MFC 0x02
244 #define DEBUG_FORWARD 0x04
245 #define DEBUG_EXPIRE 0x08
246 #define DEBUG_XMIT 0x10
247 #define DEBUG_REG 0x20
248 #define DEBUG_PIM 0x40
249 #define DEBUG_ERR 0x80
250 #define DEBUG_ANY 0x7f
251 #define MRT6_DLOG(m, fmt, ...) \
252 if (V_mrt6debug & (m)) \
253 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
254 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
255 #else
256 #define MRT6_DLOG(m, fmt, ...)
257 #endif
258
259 static void expire_upcalls(void *);
260 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
261 #define UPCALL_EXPIRE 6 /* number of timeouts */
262
263 /*
264 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
265 */
266
267 /*
268 * 'Interfaces' associated with decapsulator (so we can tell
269 * packets that went through it from ones that get reflected
270 * by a broken gateway). Different from IPv4 register_if,
271 * these interfaces are linked into the system ifnet list,
272 * because per-interface IPv6 statistics are maintained in
273 * ifp->if_afdata. But it does not have any routes point
274 * to them. I.e., packets can't be sent this way. They
275 * only exist as a placeholder for multicast source
276 * verification.
277 */
278 static struct ifnet *multicast_register_if6;
279
280 #define ENCAP_HOPS 64
281
282 /*
283 * Private variables.
284 */
285 static mifi_t nummifs = 0;
286 static mifi_t reg_mif_num = (mifi_t)-1;
287
288 static struct pim6stat pim6stat;
289 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
290 &pim6stat, pim6stat,
291 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
292
293 #define PIM6STAT_INC(name) pim6stat.name += 1
294 VNET_DEFINE_STATIC(int, pim6);
295 #define V_pim6 VNET(pim6)
296
297 /*
298 * Hash function for a source, group entry
299 */
300 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
301 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
302 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
303 (g).s6_addr32[2] ^ (g).s6_addr32[3])
304
305 /*
306 * Find a route for a given origin IPv6 address and Multicast group address.
307 */
308 #define MF6CFIND(o, g, rt) do { \
309 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
310 rt = NULL; \
311 while (_rt) { \
312 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
313 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
314 (_rt->mf6c_stall == NULL)) { \
315 rt = _rt; \
316 break; \
317 } \
318 _rt = _rt->mf6c_next; \
319 } \
320 if (rt == NULL) { \
321 MRT6STAT_INC(mrt6s_mfc_misses); \
322 } \
323 } while (/*CONSTCOND*/ 0)
324
325 /*
326 * Macros to compute elapsed time efficiently
327 * Borrowed from Van Jacobson's scheduling code
328 * XXX: replace with timersub() ?
329 */
330 #define TV_DELTA(a, b, delta) do { \
331 int xxs; \
332 \
333 delta = (a).tv_usec - (b).tv_usec; \
334 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
335 switch (xxs) { \
336 case 2: \
337 delta += 1000000; \
338 /* FALLTHROUGH */ \
339 case 1: \
340 delta += 1000000; \
341 break; \
342 default: \
343 delta += (1000000 * xxs); \
344 } \
345 } \
346 } while (/*CONSTCOND*/ 0)
347
348 /* XXX: replace with timercmp(a, b, <) ? */
349 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
350 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
351
352 #ifdef UPCALL_TIMING
353 #define UPCALL_MAX 50
354 static u_long upcall_data[UPCALL_MAX + 1];
355 static void collate();
356 #endif /* UPCALL_TIMING */
357
358 static int ip6_mrouter_init(struct socket *, int, int);
359 static int add_m6fc(struct mf6cctl *);
360 static int add_m6if(struct mif6ctl *);
361 static int del_m6fc(struct mf6cctl *);
362 static int del_m6if(mifi_t *);
363 static int del_m6if_locked(mifi_t *);
364 static int get_mif6_cnt(struct sioc_mif_req6 *);
365 static int get_sg_cnt(struct sioc_sg_req6 *);
366
367 static struct callout expire_upcalls_ch;
368
369 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
370 int X_ip6_mrouter_done(void);
371 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
372 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
373 int X_mrt6_ioctl(u_long, caddr_t);
374
375 /*
376 * Handle MRT setsockopt commands to modify the multicast routing tables.
377 */
378 int
X_ip6_mrouter_set(struct socket * so,struct sockopt * sopt)379 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
380 {
381 int error = 0;
382 int optval;
383 struct mif6ctl mifc;
384 struct mf6cctl mfcc;
385 mifi_t mifi;
386
387 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
388 return (EPERM);
389
390 switch (sopt->sopt_name) {
391 case MRT6_INIT:
392 #ifdef MRT6_OINIT
393 case MRT6_OINIT:
394 #endif
395 error = sooptcopyin(sopt, &optval, sizeof(optval),
396 sizeof(optval));
397 if (error)
398 break;
399 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
400 break;
401 case MRT6_DONE:
402 error = X_ip6_mrouter_done();
403 break;
404 case MRT6_ADD_MIF:
405 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
406 if (error)
407 break;
408 error = add_m6if(&mifc);
409 break;
410 case MRT6_ADD_MFC:
411 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
412 if (error)
413 break;
414 error = add_m6fc(&mfcc);
415 break;
416 case MRT6_DEL_MFC:
417 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
418 if (error)
419 break;
420 error = del_m6fc(&mfcc);
421 break;
422 case MRT6_DEL_MIF:
423 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
424 if (error)
425 break;
426 error = del_m6if(&mifi);
427 break;
428 case MRT6_PIM:
429 error = sooptcopyin(sopt, &optval, sizeof(optval),
430 sizeof(optval));
431 if (error)
432 break;
433 error = set_pim6(&optval);
434 break;
435 default:
436 error = EOPNOTSUPP;
437 break;
438 }
439
440 return (error);
441 }
442
443 /*
444 * Handle MRT getsockopt commands
445 */
446 int
X_ip6_mrouter_get(struct socket * so,struct sockopt * sopt)447 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
448 {
449 int error = 0;
450
451 if (so != V_ip6_mrouter)
452 return (EACCES);
453
454 switch (sopt->sopt_name) {
455 case MRT6_PIM:
456 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
457 break;
458 }
459 return (error);
460 }
461
462 /*
463 * Handle ioctl commands to obtain information from the cache
464 */
465 int
X_mrt6_ioctl(u_long cmd,caddr_t data)466 X_mrt6_ioctl(u_long cmd, caddr_t data)
467 {
468 int ret;
469
470 ret = EINVAL;
471
472 switch (cmd) {
473 case SIOCGETSGCNT_IN6:
474 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
475 break;
476
477 case SIOCGETMIFCNT_IN6:
478 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
479 break;
480
481 default:
482 break;
483 }
484
485 return (ret);
486 }
487
488 /*
489 * returns the packet, byte, rpf-failure count for the source group provided
490 */
491 static int
get_sg_cnt(struct sioc_sg_req6 * req)492 get_sg_cnt(struct sioc_sg_req6 *req)
493 {
494 struct mf6c *rt;
495 int ret;
496
497 ret = 0;
498
499 MFC6_LOCK();
500
501 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
502 if (rt == NULL) {
503 ret = ESRCH;
504 } else {
505 req->pktcnt = rt->mf6c_pkt_cnt;
506 req->bytecnt = rt->mf6c_byte_cnt;
507 req->wrong_if = rt->mf6c_wrong_if;
508 }
509
510 MFC6_UNLOCK();
511
512 return (ret);
513 }
514
515 /*
516 * returns the input and output packet and byte counts on the mif provided
517 */
518 static int
get_mif6_cnt(struct sioc_mif_req6 * req)519 get_mif6_cnt(struct sioc_mif_req6 *req)
520 {
521 mifi_t mifi;
522 int ret;
523
524 ret = 0;
525 mifi = req->mifi;
526
527 MIF6_LOCK();
528
529 if (mifi >= nummifs) {
530 ret = EINVAL;
531 } else {
532 req->icount = mif6table[mifi].m6_pkt_in;
533 req->ocount = mif6table[mifi].m6_pkt_out;
534 req->ibytes = mif6table[mifi].m6_bytes_in;
535 req->obytes = mif6table[mifi].m6_bytes_out;
536 }
537
538 MIF6_UNLOCK();
539
540 return (ret);
541 }
542
543 static int
set_pim6(int * i)544 set_pim6(int *i)
545 {
546 if ((*i != 1) && (*i != 0))
547 return (EINVAL);
548
549 V_pim6 = *i;
550
551 return (0);
552 }
553
554 /*
555 * Enable multicast routing
556 */
557 static int
ip6_mrouter_init(struct socket * so,int v,int cmd)558 ip6_mrouter_init(struct socket *so, int v, int cmd)
559 {
560
561 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
562 so->so_type, so->so_proto->pr_protocol);
563
564 if (so->so_type != SOCK_RAW ||
565 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
566 return (EOPNOTSUPP);
567
568 if (v != 1)
569 return (ENOPROTOOPT);
570
571 MROUTER6_LOCK();
572
573 if (V_ip6_mrouter != NULL) {
574 MROUTER6_UNLOCK();
575 return (EADDRINUSE);
576 }
577
578 V_ip6_mrouter = so;
579 V_ip6_mrouter_ver = cmd;
580
581 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
582 bzero((caddr_t)n6expire, sizeof(n6expire));
583
584 V_pim6 = 0;/* used for stubbing out/in pim stuff */
585
586 callout_init(&expire_upcalls_ch, 0);
587 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
588 expire_upcalls, NULL);
589
590 MROUTER6_UNLOCK();
591 MRT6_DLOG(DEBUG_ANY, "finished");
592
593 return (0);
594 }
595
596 /*
597 * Disable IPv6 multicast forwarding.
598 */
599 int
X_ip6_mrouter_done(void)600 X_ip6_mrouter_done(void)
601 {
602 mifi_t mifi;
603 u_long i;
604 struct mf6c *rt;
605 struct rtdetq *rte;
606
607 MROUTER6_LOCK();
608
609 if (V_ip6_mrouter == NULL) {
610 MROUTER6_UNLOCK();
611 return (EINVAL);
612 }
613
614 /*
615 * For each phyint in use, disable promiscuous reception of all IPv6
616 * multicasts.
617 */
618 for (mifi = 0; mifi < nummifs; mifi++) {
619 if (mif6table[mifi].m6_ifp &&
620 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
621 if_allmulti(mif6table[mifi].m6_ifp, 0);
622 }
623 }
624 bzero((caddr_t)mif6table, sizeof(mif6table));
625 nummifs = 0;
626
627 V_pim6 = 0; /* used to stub out/in pim specific code */
628
629 callout_stop(&expire_upcalls_ch);
630
631 /*
632 * Free all multicast forwarding cache entries.
633 */
634 MFC6_LOCK();
635 for (i = 0; i < MF6CTBLSIZ; i++) {
636 rt = mf6ctable[i];
637 while (rt) {
638 struct mf6c *frt;
639
640 for (rte = rt->mf6c_stall; rte != NULL; ) {
641 struct rtdetq *n = rte->next;
642
643 m_freem(rte->m);
644 free(rte, M_MRTABLE6);
645 rte = n;
646 }
647 frt = rt;
648 rt = rt->mf6c_next;
649 free(frt, M_MRTABLE6);
650 }
651 }
652 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
653 MFC6_UNLOCK();
654
655 /*
656 * Reset register interface
657 */
658 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
659 if_detach(multicast_register_if6);
660 if_free(multicast_register_if6);
661 reg_mif_num = (mifi_t)-1;
662 multicast_register_if6 = NULL;
663 }
664
665 V_ip6_mrouter = NULL;
666 V_ip6_mrouter_ver = 0;
667
668 MROUTER6_UNLOCK();
669 MRT6_DLOG(DEBUG_ANY, "finished");
670
671 return (0);
672 }
673
674 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
675
676 /*
677 * Add a mif to the mif table
678 */
679 static int
add_m6if(struct mif6ctl * mifcp)680 add_m6if(struct mif6ctl *mifcp)
681 {
682 struct mif6 *mifp;
683 struct ifnet *ifp;
684 int error;
685
686 MIF6_LOCK();
687
688 if (mifcp->mif6c_mifi >= MAXMIFS) {
689 MIF6_UNLOCK();
690 return (EINVAL);
691 }
692 mifp = mif6table + mifcp->mif6c_mifi;
693 if (mifp->m6_ifp != NULL) {
694 MIF6_UNLOCK();
695 return (EADDRINUSE); /* XXX: is it appropriate? */
696 }
697 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
698 MIF6_UNLOCK();
699 return (ENXIO);
700 }
701
702 ifp = ifnet_byindex(mifcp->mif6c_pifi);
703
704 if (mifcp->mif6c_flags & MIFF_REGISTER) {
705 if (reg_mif_num == (mifi_t)-1) {
706 ifp = if_alloc(IFT_OTHER);
707
708 if_initname(ifp, "register_mif", 0);
709 ifp->if_flags |= IFF_LOOPBACK;
710 if_attach(ifp);
711 multicast_register_if6 = ifp;
712 reg_mif_num = mifcp->mif6c_mifi;
713 /*
714 * it is impossible to guess the ifindex of the
715 * register interface. So mif6c_pifi is automatically
716 * calculated.
717 */
718 mifcp->mif6c_pifi = ifp->if_index;
719 } else {
720 ifp = multicast_register_if6;
721 }
722 } else {
723 /* Make sure the interface supports multicast */
724 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
725 MIF6_UNLOCK();
726 return (EOPNOTSUPP);
727 }
728
729 error = if_allmulti(ifp, 1);
730 if (error) {
731 MIF6_UNLOCK();
732 return (error);
733 }
734 }
735
736 mifp->m6_flags = mifcp->mif6c_flags;
737 mifp->m6_ifp = ifp;
738
739 /* initialize per mif pkt counters */
740 mifp->m6_pkt_in = 0;
741 mifp->m6_pkt_out = 0;
742 mifp->m6_bytes_in = 0;
743 mifp->m6_bytes_out = 0;
744
745 /* Adjust nummifs up if the mifi is higher than nummifs */
746 if (nummifs <= mifcp->mif6c_mifi)
747 nummifs = mifcp->mif6c_mifi + 1;
748
749 MIF6_UNLOCK();
750 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
751 if_name(ifp));
752
753 return (0);
754 }
755
756 /*
757 * Delete a mif from the mif table
758 */
759 static int
del_m6if_locked(mifi_t * mifip)760 del_m6if_locked(mifi_t *mifip)
761 {
762 struct mif6 *mifp = mif6table + *mifip;
763 mifi_t mifi;
764 struct ifnet *ifp;
765
766 MIF6_LOCK_ASSERT();
767
768 if (*mifip >= nummifs)
769 return (EINVAL);
770 if (mifp->m6_ifp == NULL)
771 return (EINVAL);
772
773 if (!(mifp->m6_flags & MIFF_REGISTER)) {
774 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
775 ifp = mifp->m6_ifp;
776 if_allmulti(ifp, 0);
777 } else {
778 if (reg_mif_num != (mifi_t)-1 &&
779 multicast_register_if6 != NULL) {
780 if_detach(multicast_register_if6);
781 if_free(multicast_register_if6);
782 reg_mif_num = (mifi_t)-1;
783 multicast_register_if6 = NULL;
784 }
785 }
786
787 bzero((caddr_t)mifp, sizeof(*mifp));
788
789 /* Adjust nummifs down */
790 for (mifi = nummifs; mifi > 0; mifi--)
791 if (mif6table[mifi - 1].m6_ifp)
792 break;
793 nummifs = mifi;
794 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
795
796 return (0);
797 }
798
799 static int
del_m6if(mifi_t * mifip)800 del_m6if(mifi_t *mifip)
801 {
802 int cc;
803
804 MIF6_LOCK();
805 cc = del_m6if_locked(mifip);
806 MIF6_UNLOCK();
807
808 return (cc);
809 }
810
811 /*
812 * Add an mfc entry
813 */
814 static int
add_m6fc(struct mf6cctl * mfccp)815 add_m6fc(struct mf6cctl *mfccp)
816 {
817 struct mf6c *rt;
818 u_long hash;
819 struct rtdetq *rte;
820 u_short nstl;
821 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
822
823 MFC6_LOCK();
824
825 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
826 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
827
828 /* If an entry already exists, just update the fields */
829 if (rt) {
830 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
831 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
832 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
833 mfccp->mf6cc_parent);
834
835 rt->mf6c_parent = mfccp->mf6cc_parent;
836 rt->mf6c_ifset = mfccp->mf6cc_ifset;
837
838 MFC6_UNLOCK();
839 return (0);
840 }
841
842 /*
843 * Find the entry for which the upcall was made and update
844 */
845 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
846 mfccp->mf6cc_mcastgrp.sin6_addr);
847 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
848 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
849 &mfccp->mf6cc_origin.sin6_addr) &&
850 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
851 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
852 (rt->mf6c_stall != NULL)) {
853 if (nstl++)
854 log(LOG_ERR,
855 "add_m6fc: %s o %s g %s p %x dbx %p\n",
856 "multiple kernel entries",
857 ip6_sprintf(ip6bufo,
858 &mfccp->mf6cc_origin.sin6_addr),
859 ip6_sprintf(ip6bufg,
860 &mfccp->mf6cc_mcastgrp.sin6_addr),
861 mfccp->mf6cc_parent, rt->mf6c_stall);
862
863 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
864 ip6_sprintf(ip6bufo,
865 &mfccp->mf6cc_origin.sin6_addr),
866 ip6_sprintf(ip6bufg,
867 &mfccp->mf6cc_mcastgrp.sin6_addr),
868 mfccp->mf6cc_parent, rt->mf6c_stall);
869
870 rt->mf6c_origin = mfccp->mf6cc_origin;
871 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
872 rt->mf6c_parent = mfccp->mf6cc_parent;
873 rt->mf6c_ifset = mfccp->mf6cc_ifset;
874 /* initialize pkt counters per src-grp */
875 rt->mf6c_pkt_cnt = 0;
876 rt->mf6c_byte_cnt = 0;
877 rt->mf6c_wrong_if = 0;
878
879 rt->mf6c_expire = 0; /* Don't clean this guy up */
880 n6expire[hash]--;
881
882 /* free packets Qed at the end of this entry */
883 for (rte = rt->mf6c_stall; rte != NULL; ) {
884 struct rtdetq *n = rte->next;
885 ip6_mdq(rte->m, rte->ifp, rt);
886 m_freem(rte->m);
887 #ifdef UPCALL_TIMING
888 collate(&(rte->t));
889 #endif /* UPCALL_TIMING */
890 free(rte, M_MRTABLE6);
891 rte = n;
892 }
893 rt->mf6c_stall = NULL;
894 }
895 }
896
897 /*
898 * It is possible that an entry is being inserted without an upcall
899 */
900 if (nstl == 0) {
901 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
902 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
903 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
904 mfccp->mf6cc_parent);
905
906 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
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 rt->mf6c_origin = mfccp->mf6cc_origin;
912 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
913 rt->mf6c_parent = mfccp->mf6cc_parent;
914 rt->mf6c_ifset = mfccp->mf6cc_ifset;
915 /* initialize pkt counters per src-grp */
916 rt->mf6c_pkt_cnt = 0;
917 rt->mf6c_byte_cnt = 0;
918 rt->mf6c_wrong_if = 0;
919
920 if (rt->mf6c_expire)
921 n6expire[hash]--;
922 rt->mf6c_expire = 0;
923 }
924 }
925 if (rt == NULL) {
926 /* no upcall, so make a new entry */
927 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
928 M_NOWAIT);
929 if (rt == NULL) {
930 MFC6_UNLOCK();
931 return (ENOBUFS);
932 }
933
934 /* insert new entry at head of hash chain */
935 rt->mf6c_origin = mfccp->mf6cc_origin;
936 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
937 rt->mf6c_parent = mfccp->mf6cc_parent;
938 rt->mf6c_ifset = mfccp->mf6cc_ifset;
939 /* initialize pkt counters per src-grp */
940 rt->mf6c_pkt_cnt = 0;
941 rt->mf6c_byte_cnt = 0;
942 rt->mf6c_wrong_if = 0;
943 rt->mf6c_expire = 0;
944 rt->mf6c_stall = NULL;
945
946 /* link into table */
947 rt->mf6c_next = mf6ctable[hash];
948 mf6ctable[hash] = rt;
949 }
950 }
951
952 MFC6_UNLOCK();
953 return (0);
954 }
955
956 #ifdef UPCALL_TIMING
957 /*
958 * collect delay statistics on the upcalls
959 */
960 static void
collate(struct timeval * t)961 collate(struct timeval *t)
962 {
963 u_long d;
964 struct timeval tp;
965 u_long delta;
966
967 GET_TIME(tp);
968
969 if (TV_LT(*t, tp))
970 {
971 TV_DELTA(tp, *t, delta);
972
973 d = delta >> 10;
974 if (d > UPCALL_MAX)
975 d = UPCALL_MAX;
976
977 ++upcall_data[d];
978 }
979 }
980 #endif /* UPCALL_TIMING */
981
982 /*
983 * Delete an mfc entry
984 */
985 static int
del_m6fc(struct mf6cctl * mfccp)986 del_m6fc(struct mf6cctl *mfccp)
987 {
988 #ifdef MRT6DEBUG
989 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
990 #endif
991 struct sockaddr_in6 origin;
992 struct sockaddr_in6 mcastgrp;
993 struct mf6c *rt;
994 struct mf6c **nptr;
995 u_long hash;
996
997 origin = mfccp->mf6cc_origin;
998 mcastgrp = mfccp->mf6cc_mcastgrp;
999 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
1000
1001 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
1002 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1003 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1004
1005 MFC6_LOCK();
1006
1007 nptr = &mf6ctable[hash];
1008 while ((rt = *nptr) != NULL) {
1009 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1010 &rt->mf6c_origin.sin6_addr) &&
1011 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1012 &rt->mf6c_mcastgrp.sin6_addr) &&
1013 rt->mf6c_stall == NULL)
1014 break;
1015
1016 nptr = &rt->mf6c_next;
1017 }
1018 if (rt == NULL) {
1019 MFC6_UNLOCK();
1020 return (EADDRNOTAVAIL);
1021 }
1022
1023 *nptr = rt->mf6c_next;
1024 free(rt, M_MRTABLE6);
1025
1026 MFC6_UNLOCK();
1027
1028 return (0);
1029 }
1030
1031 static int
socket_send(struct socket * s,struct mbuf * mm,struct sockaddr_in6 * src)1032 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1033 {
1034
1035 if (s) {
1036 if (sbappendaddr(&s->so_rcv,
1037 (struct sockaddr *)src,
1038 mm, (struct mbuf *)0) != 0) {
1039 sorwakeup(s);
1040 return (0);
1041 }
1042 }
1043 m_freem(mm);
1044 return (-1);
1045 }
1046
1047 /*
1048 * IPv6 multicast forwarding function. This function assumes that the packet
1049 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1050 * pointed to by "ifp", and the packet is to be relayed to other networks
1051 * that have members of the packet's destination IPv6 multicast group.
1052 *
1053 * The packet is returned unscathed to the caller, unless it is
1054 * erroneous, in which case a non-zero return value tells the caller to
1055 * discard it.
1056 *
1057 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1058 * this function is called in the originating context (i.e., not when
1059 * forwarding a packet from other node). ip6_output(), which is currently the
1060 * only function that calls this function is called in the originating context,
1061 * explicitly ensures this condition. It is caller's responsibility to ensure
1062 * that if this function is called from somewhere else in the originating
1063 * context in the future.
1064 */
1065 int
X_ip6_mforward(struct ip6_hdr * ip6,struct ifnet * ifp,struct mbuf * m)1066 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1067 {
1068 struct rtdetq *rte;
1069 struct mbuf *mb0;
1070 struct mf6c *rt;
1071 struct mif6 *mifp;
1072 struct mbuf *mm;
1073 u_long hash;
1074 mifi_t mifi;
1075 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1076 #ifdef UPCALL_TIMING
1077 struct timeval tp;
1078
1079 GET_TIME(tp);
1080 #endif /* UPCALL_TIMING */
1081
1082 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1083 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1085
1086 /*
1087 * Don't forward a packet with Hop limit of zero or one,
1088 * or a packet destined to a local-only group.
1089 */
1090 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1091 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1092 return (0);
1093 ip6->ip6_hlim--;
1094
1095 /*
1096 * Source address check: do not forward packets with unspecified
1097 * source. It was discussed in July 2000, on ipngwg mailing list.
1098 * This is rather more serious than unicast cases, because some
1099 * MLD packets can be sent with the unspecified source address
1100 * (although such packets must normally set 1 to the hop limit field).
1101 */
1102 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1103 IP6STAT_INC(ip6s_cantforward);
1104 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1105 V_ip6_log_time = time_uptime;
1106 log(LOG_DEBUG,
1107 "cannot forward "
1108 "from %s to %s nxt %d received on %s\n",
1109 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1110 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1111 ip6->ip6_nxt,
1112 if_name(m->m_pkthdr.rcvif));
1113 }
1114 return (0);
1115 }
1116
1117 MFC6_LOCK();
1118
1119 /*
1120 * Determine forwarding mifs from the forwarding cache table
1121 */
1122 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1123 MRT6STAT_INC(mrt6s_mfc_lookups);
1124
1125 /* Entry exists, so forward if necessary */
1126 if (rt) {
1127 MFC6_UNLOCK();
1128 return (ip6_mdq(m, ifp, rt));
1129 }
1130
1131 /*
1132 * If we don't have a route for packet's origin,
1133 * Make a copy of the packet & send message to routing daemon.
1134 */
1135 MRT6STAT_INC(mrt6s_no_route);
1136 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1137 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1138 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1139
1140 /*
1141 * Allocate mbufs early so that we don't do extra work if we
1142 * are just going to fail anyway.
1143 */
1144 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1145 if (rte == NULL) {
1146 MFC6_UNLOCK();
1147 return (ENOBUFS);
1148 }
1149 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1150 /*
1151 * Pullup packet header if needed before storing it,
1152 * as other references may modify it in the meantime.
1153 */
1154 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1155 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1156 if (mb0 == NULL) {
1157 free(rte, M_MRTABLE6);
1158 MFC6_UNLOCK();
1159 return (ENOBUFS);
1160 }
1161
1162 /* is there an upcall waiting for this packet? */
1163 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1164 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1165 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1166 &rt->mf6c_origin.sin6_addr) &&
1167 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1168 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1169 break;
1170 }
1171
1172 if (rt == NULL) {
1173 struct mrt6msg *im;
1174 #ifdef MRT6_OINIT
1175 struct omrt6msg *oim;
1176 #endif
1177 /* no upcall, so make a new entry */
1178 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1179 if (rt == NULL) {
1180 free(rte, M_MRTABLE6);
1181 m_freem(mb0);
1182 MFC6_UNLOCK();
1183 return (ENOBUFS);
1184 }
1185 /*
1186 * Make a copy of the header to send to the user
1187 * level process
1188 */
1189 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
1190 if (mm == NULL) {
1191 free(rte, M_MRTABLE6);
1192 m_freem(mb0);
1193 free(rt, M_MRTABLE6);
1194 MFC6_UNLOCK();
1195 return (ENOBUFS);
1196 }
1197
1198 /*
1199 * Send message to routing daemon
1200 */
1201 sin6.sin6_addr = ip6->ip6_src;
1202 im = NULL;
1203 #ifdef MRT6_OINIT
1204 oim = NULL;
1205 #endif
1206 switch (V_ip6_mrouter_ver) {
1207 #ifdef MRT6_OINIT
1208 case MRT6_OINIT:
1209 oim = mtod(mm, struct omrt6msg *);
1210 oim->im6_msgtype = MRT6MSG_NOCACHE;
1211 oim->im6_mbz = 0;
1212 break;
1213 #endif
1214 case MRT6_INIT:
1215 im = mtod(mm, struct mrt6msg *);
1216 im->im6_msgtype = MRT6MSG_NOCACHE;
1217 im->im6_mbz = 0;
1218 break;
1219 default:
1220 free(rte, M_MRTABLE6);
1221 m_freem(mb0);
1222 free(rt, M_MRTABLE6);
1223 MFC6_UNLOCK();
1224 return (EINVAL);
1225 }
1226
1227 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1228 for (mifp = mif6table, mifi = 0;
1229 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1230 ;
1231
1232 switch (V_ip6_mrouter_ver) {
1233 #ifdef MRT6_OINIT
1234 case MRT6_OINIT:
1235 oim->im6_mif = mifi;
1236 break;
1237 #endif
1238 case MRT6_INIT:
1239 im->im6_mif = mifi;
1240 break;
1241 }
1242
1243 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1244 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1245 "socket queue full\n");
1246 MRT6STAT_INC(mrt6s_upq_sockfull);
1247 free(rte, M_MRTABLE6);
1248 m_freem(mb0);
1249 free(rt, M_MRTABLE6);
1250 MFC6_UNLOCK();
1251 return (ENOBUFS);
1252 }
1253
1254 MRT6STAT_INC(mrt6s_upcalls);
1255
1256 /* insert new entry at head of hash chain */
1257 bzero(rt, sizeof(*rt));
1258 rt->mf6c_origin.sin6_family = AF_INET6;
1259 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1260 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1261 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1262 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1263 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1264 rt->mf6c_expire = UPCALL_EXPIRE;
1265 n6expire[hash]++;
1266 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1267
1268 /* link into table */
1269 rt->mf6c_next = mf6ctable[hash];
1270 mf6ctable[hash] = rt;
1271 /* Add this entry to the end of the queue */
1272 rt->mf6c_stall = rte;
1273 } else {
1274 /* determine if q has overflowed */
1275 struct rtdetq **p;
1276 int npkts = 0;
1277
1278 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1279 if (++npkts > MAX_UPQ6) {
1280 MRT6STAT_INC(mrt6s_upq_ovflw);
1281 free(rte, M_MRTABLE6);
1282 m_freem(mb0);
1283 MFC6_UNLOCK();
1284 return (0);
1285 }
1286
1287 /* Add this entry to the end of the queue */
1288 *p = rte;
1289 }
1290
1291 rte->next = NULL;
1292 rte->m = mb0;
1293 rte->ifp = ifp;
1294 #ifdef UPCALL_TIMING
1295 rte->t = tp;
1296 #endif /* UPCALL_TIMING */
1297
1298 MFC6_UNLOCK();
1299
1300 return (0);
1301 }
1302
1303 /*
1304 * Clean up cache entries if upcalls are not serviced
1305 * Call from the Slow Timeout mechanism, every half second.
1306 */
1307 static void
expire_upcalls(void * unused)1308 expire_upcalls(void *unused)
1309 {
1310 #ifdef MRT6DEBUG
1311 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1312 #endif
1313 struct rtdetq *rte;
1314 struct mf6c *mfc, **nptr;
1315 u_long i;
1316
1317 MFC6_LOCK();
1318 for (i = 0; i < MF6CTBLSIZ; i++) {
1319 if (n6expire[i] == 0)
1320 continue;
1321 nptr = &mf6ctable[i];
1322 while ((mfc = *nptr) != NULL) {
1323 rte = mfc->mf6c_stall;
1324 /*
1325 * Skip real cache entries
1326 * Make sure it wasn't marked to not expire (shouldn't happen)
1327 * If it expires now
1328 */
1329 if (rte != NULL &&
1330 mfc->mf6c_expire != 0 &&
1331 --mfc->mf6c_expire == 0) {
1332 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1333 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1334 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1335 /*
1336 * drop all the packets
1337 * free the mbuf with the pkt, if, timing info
1338 */
1339 do {
1340 struct rtdetq *n = rte->next;
1341 m_freem(rte->m);
1342 free(rte, M_MRTABLE6);
1343 rte = n;
1344 } while (rte != NULL);
1345 MRT6STAT_INC(mrt6s_cache_cleanups);
1346 n6expire[i]--;
1347
1348 *nptr = mfc->mf6c_next;
1349 free(mfc, M_MRTABLE6);
1350 } else {
1351 nptr = &mfc->mf6c_next;
1352 }
1353 }
1354 }
1355 MFC6_UNLOCK();
1356 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1357 expire_upcalls, NULL);
1358 }
1359
1360 /*
1361 * Packet forwarding routine once entry in the cache is made
1362 */
1363 static int
ip6_mdq(struct mbuf * m,struct ifnet * ifp,struct mf6c * rt)1364 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1365 {
1366 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1367 mifi_t mifi, iif;
1368 struct mif6 *mifp;
1369 int plen = m->m_pkthdr.len;
1370 struct in6_addr src0, dst0; /* copies for local work */
1371 u_int32_t iszone, idzone, oszone, odzone;
1372 int error = 0;
1373
1374 /*
1375 * Don't forward if it didn't arrive from the parent mif
1376 * for its origin.
1377 */
1378 mifi = rt->mf6c_parent;
1379 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1380 /* came in the wrong interface */
1381 MRT6_DLOG(DEBUG_FORWARD,
1382 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1383 mifi, mif6table[mifi].m6_ifp->if_index);
1384 MRT6STAT_INC(mrt6s_wrong_if);
1385 rt->mf6c_wrong_if++;
1386 /*
1387 * If we are doing PIM processing, and we are forwarding
1388 * packets on this interface, send a message to the
1389 * routing daemon.
1390 */
1391 /* have to make sure this is a valid mif */
1392 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1393 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1394 /*
1395 * Check the M_LOOP flag to avoid an
1396 * unnecessary PIM assert.
1397 * XXX: M_LOOP is an ad-hoc hack...
1398 */
1399 static struct sockaddr_in6 sin6 =
1400 { sizeof(sin6), AF_INET6 };
1401
1402 struct mbuf *mm;
1403 struct mrt6msg *im;
1404 #ifdef MRT6_OINIT
1405 struct omrt6msg *oim;
1406 #endif
1407
1408 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
1409 M_NOWAIT);
1410 if (mm &&
1411 (!M_WRITABLE(mm) ||
1412 mm->m_len < sizeof(struct ip6_hdr)))
1413 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1414 if (mm == NULL)
1415 return (ENOBUFS);
1416
1417 #ifdef MRT6_OINIT
1418 oim = NULL;
1419 #endif
1420 im = NULL;
1421 switch (V_ip6_mrouter_ver) {
1422 #ifdef MRT6_OINIT
1423 case MRT6_OINIT:
1424 oim = mtod(mm, struct omrt6msg *);
1425 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1426 oim->im6_mbz = 0;
1427 break;
1428 #endif
1429 case MRT6_INIT:
1430 im = mtod(mm, struct mrt6msg *);
1431 im->im6_msgtype = MRT6MSG_WRONGMIF;
1432 im->im6_mbz = 0;
1433 break;
1434 default:
1435 m_freem(mm);
1436 return (EINVAL);
1437 }
1438
1439 for (mifp = mif6table, iif = 0;
1440 iif < nummifs && mifp &&
1441 mifp->m6_ifp != ifp;
1442 mifp++, iif++)
1443 ;
1444
1445 switch (V_ip6_mrouter_ver) {
1446 #ifdef MRT6_OINIT
1447 case MRT6_OINIT:
1448 oim->im6_mif = iif;
1449 sin6.sin6_addr = oim->im6_src;
1450 break;
1451 #endif
1452 case MRT6_INIT:
1453 im->im6_mif = iif;
1454 sin6.sin6_addr = im->im6_src;
1455 break;
1456 }
1457
1458 MRT6STAT_INC(mrt6s_upcalls);
1459
1460 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1461 MRT6_DLOG(DEBUG_ANY,
1462 "ip6_mrouter socket queue full");
1463 MRT6STAT_INC(mrt6s_upq_sockfull);
1464 return (ENOBUFS);
1465 } /* if socket Q full */
1466 } /* if PIM */
1467 return (0);
1468 } /* if wrong iif */
1469
1470 /* If I sourced this packet, it counts as output, else it was input. */
1471 if (m->m_pkthdr.rcvif == NULL) {
1472 /* XXX: is rcvif really NULL when output?? */
1473 mif6table[mifi].m6_pkt_out++;
1474 mif6table[mifi].m6_bytes_out += plen;
1475 } else {
1476 mif6table[mifi].m6_pkt_in++;
1477 mif6table[mifi].m6_bytes_in += plen;
1478 }
1479 rt->mf6c_pkt_cnt++;
1480 rt->mf6c_byte_cnt += plen;
1481
1482 /*
1483 * For each mif, forward a copy of the packet if there are group
1484 * members downstream on the interface.
1485 */
1486 src0 = ip6->ip6_src;
1487 dst0 = ip6->ip6_dst;
1488 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1489 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1490 IP6STAT_INC(ip6s_badscope);
1491 return (error);
1492 }
1493 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1494 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1495 /*
1496 * check if the outgoing packet is going to break
1497 * a scope boundary.
1498 * XXX For packets through PIM register tunnel
1499 * interface, we believe a routing daemon.
1500 */
1501 if (!(mif6table[rt->mf6c_parent].m6_flags &
1502 MIFF_REGISTER) &&
1503 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1504 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1505 &oszone) ||
1506 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1507 &odzone) ||
1508 iszone != oszone ||
1509 idzone != odzone) {
1510 IP6STAT_INC(ip6s_badscope);
1511 continue;
1512 }
1513 }
1514
1515 mifp->m6_pkt_out++;
1516 mifp->m6_bytes_out += plen;
1517 if (mifp->m6_flags & MIFF_REGISTER)
1518 register_send(ip6, mifp, m);
1519 else
1520 phyint_send(ip6, mifp, m);
1521 }
1522 }
1523 return (0);
1524 }
1525
1526 static void
phyint_send(struct ip6_hdr * ip6,struct mif6 * mifp,struct mbuf * m)1527 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1528 {
1529 #ifdef MRT6DEBUG
1530 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1531 #endif
1532 struct mbuf *mb_copy;
1533 struct ifnet *ifp = mifp->m6_ifp;
1534 int error = 0;
1535 u_long linkmtu;
1536
1537 /*
1538 * Make a new reference to the packet; make sure that
1539 * the IPv6 header is actually copied, not just referenced,
1540 * so that ip6_output() only scribbles on the copy.
1541 */
1542 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1543 if (mb_copy &&
1544 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1545 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1546 if (mb_copy == NULL) {
1547 return;
1548 }
1549 /* set MCAST flag to the outgoing packet */
1550 mb_copy->m_flags |= M_MCAST;
1551
1552 /*
1553 * If we sourced the packet, call ip6_output since we may devide
1554 * the packet into fragments when the packet is too big for the
1555 * outgoing interface.
1556 * Otherwise, we can simply send the packet to the interface
1557 * sending queue.
1558 */
1559 if (m->m_pkthdr.rcvif == NULL) {
1560 struct ip6_moptions im6o;
1561 struct epoch_tracker et;
1562
1563 im6o.im6o_multicast_ifp = ifp;
1564 /* XXX: ip6_output will override ip6->ip6_hlim */
1565 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1566 im6o.im6o_multicast_loop = 1;
1567 NET_EPOCH_ENTER(et);
1568 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1569 NULL, NULL);
1570 NET_EPOCH_EXIT(et);
1571
1572 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1573 (uint16_t)(mifp - mif6table), error);
1574 return;
1575 }
1576
1577 /*
1578 * If configured to loop back multicasts by default,
1579 * loop back a copy now.
1580 */
1581 if (in6_mcast_loop)
1582 ip6_mloopback(ifp, m);
1583
1584 /*
1585 * Put the packet into the sending queue of the outgoing interface
1586 * if it would fit in the MTU of the interface.
1587 */
1588 linkmtu = IN6_LINKMTU(ifp);
1589 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1590 struct sockaddr_in6 dst6;
1591
1592 bzero(&dst6, sizeof(dst6));
1593 dst6.sin6_len = sizeof(struct sockaddr_in6);
1594 dst6.sin6_family = AF_INET6;
1595 dst6.sin6_addr = ip6->ip6_dst;
1596
1597 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1598 /*
1599 * We just call if_output instead of nd6_output here, since
1600 * we need no ND for a multicast forwarded packet...right?
1601 */
1602 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1603 error = (*ifp->if_output)(ifp, mb_copy,
1604 (struct sockaddr *)&dst6, NULL);
1605 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1606 (uint16_t)(mifp - mif6table), error);
1607 } else {
1608 /*
1609 * pMTU discovery is intentionally disabled by default, since
1610 * various router may notify pMTU in multicast, which can be
1611 * a DDoS to a router
1612 */
1613 if (V_ip6_mcast_pmtu)
1614 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1615 else {
1616 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1617 "g %s size %d (discarded)", if_name(ifp),
1618 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1619 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1620 mb_copy->m_pkthdr.len);
1621 m_freem(mb_copy); /* simply discard the packet */
1622 }
1623 }
1624 }
1625
1626 static int
register_send(struct ip6_hdr * ip6,struct mif6 * mif,struct mbuf * m)1627 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1628 {
1629 #ifdef MRT6DEBUG
1630 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1631 #endif
1632 struct mbuf *mm;
1633 int i, len = m->m_pkthdr.len;
1634 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1635 struct mrt6msg *im6;
1636
1637 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1638 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1639 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1640 PIM6STAT_INC(pim6s_snd_registers);
1641
1642 /* Make a copy of the packet to send to the user level process. */
1643 mm = m_gethdr(M_NOWAIT, MT_DATA);
1644 if (mm == NULL)
1645 return (ENOBUFS);
1646 mm->m_data += max_linkhdr;
1647 mm->m_len = sizeof(struct ip6_hdr);
1648
1649 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
1650 m_freem(mm);
1651 return (ENOBUFS);
1652 }
1653 i = MHLEN - M_LEADINGSPACE(mm);
1654 if (i > len)
1655 i = len;
1656 mm = m_pullup(mm, i);
1657 if (mm == NULL)
1658 return (ENOBUFS);
1659 /* TODO: check it! */
1660 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1661
1662 /*
1663 * Send message to routing daemon
1664 */
1665 sin6.sin6_addr = ip6->ip6_src;
1666
1667 im6 = mtod(mm, struct mrt6msg *);
1668 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1669 im6->im6_mbz = 0;
1670
1671 im6->im6_mif = mif - mif6table;
1672
1673 /* iif info is not given for reg. encap.n */
1674 MRT6STAT_INC(mrt6s_upcalls);
1675
1676 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1677 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1678 MRT6STAT_INC(mrt6s_upq_sockfull);
1679 return (ENOBUFS);
1680 }
1681 return (0);
1682 }
1683
1684 /*
1685 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1686 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1687 * into the kernel.
1688 */
1689 static int
pim6_encapcheck(const struct mbuf * m __unused,int off __unused,int proto __unused,void * arg __unused)1690 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
1691 int proto __unused, void *arg __unused)
1692 {
1693
1694 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1695 return (8); /* claim the datagram. */
1696 }
1697
1698 /*
1699 * PIM sparse mode hook
1700 * Receives the pim control messages, and passes them up to the listening
1701 * socket, using rip6_input.
1702 * The only message processed is the REGISTER pim message; the pim header
1703 * is stripped off, and the inner packet is passed to register_mforward.
1704 */
1705 static int
pim6_input(struct mbuf * m,int off,int proto,void * arg __unused)1706 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
1707 {
1708 struct pim *pim; /* pointer to a pim struct */
1709 struct ip6_hdr *ip6;
1710 int pimlen;
1711 int minlen;
1712
1713 PIM6STAT_INC(pim6s_rcv_total);
1714
1715 /*
1716 * Validate lengths
1717 */
1718 pimlen = m->m_pkthdr.len - off;
1719 if (pimlen < PIM_MINLEN) {
1720 PIM6STAT_INC(pim6s_rcv_tooshort);
1721 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1722 m_freem(m);
1723 return (IPPROTO_DONE);
1724 }
1725
1726 /*
1727 * if the packet is at least as big as a REGISTER, go ahead
1728 * and grab the PIM REGISTER header size, to avoid another
1729 * possible m_pullup() later.
1730 *
1731 * PIM_MINLEN == pimhdr + u_int32 == 8
1732 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1733 */
1734 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1735
1736 /*
1737 * Make sure that the IP6 and PIM headers in contiguous memory, and
1738 * possibly the PIM REGISTER header
1739 */
1740 if (m->m_len < off + minlen) {
1741 m = m_pullup(m, off + minlen);
1742 if (m == NULL) {
1743 IP6STAT_INC(ip6s_exthdrtoolong);
1744 return (IPPROTO_DONE);
1745 }
1746 }
1747 ip6 = mtod(m, struct ip6_hdr *);
1748 pim = (struct pim *)((caddr_t)ip6 + off);
1749
1750 #define PIM6_CHECKSUM
1751 #ifdef PIM6_CHECKSUM
1752 {
1753 int cksumlen;
1754
1755 /*
1756 * Validate checksum.
1757 * If PIM REGISTER, exclude the data packet
1758 */
1759 if (pim->pim_type == PIM_REGISTER)
1760 cksumlen = PIM_MINLEN;
1761 else
1762 cksumlen = pimlen;
1763
1764 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1765 PIM6STAT_INC(pim6s_rcv_badsum);
1766 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1767 m_freem(m);
1768 return (IPPROTO_DONE);
1769 }
1770 }
1771 #endif /* PIM_CHECKSUM */
1772
1773 /* PIM version check */
1774 if (pim->pim_ver != PIM_VERSION) {
1775 PIM6STAT_INC(pim6s_rcv_badversion);
1776 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1777 "incorrect version %d, expecting %d",
1778 pim->pim_ver, PIM_VERSION);
1779 m_freem(m);
1780 return (IPPROTO_DONE);
1781 }
1782
1783 if (pim->pim_type == PIM_REGISTER) {
1784 /*
1785 * since this is a REGISTER, we'll make a copy of the register
1786 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1787 * routing daemon.
1788 */
1789 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1790
1791 struct mbuf *mcp;
1792 struct ip6_hdr *eip6;
1793 u_int32_t *reghdr;
1794 int rc;
1795 #ifdef MRT6DEBUG
1796 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1797 #endif
1798
1799 PIM6STAT_INC(pim6s_rcv_registers);
1800
1801 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1802 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1803 reg_mif_num);
1804 m_freem(m);
1805 return (IPPROTO_DONE);
1806 }
1807
1808 reghdr = (u_int32_t *)(pim + 1);
1809
1810 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1811 goto pim6_input_to_daemon;
1812
1813 /*
1814 * Validate length
1815 */
1816 if (pimlen < PIM6_REG_MINLEN) {
1817 PIM6STAT_INC(pim6s_rcv_tooshort);
1818 PIM6STAT_INC(pim6s_rcv_badregisters);
1819 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1820 "size too small %d from %s",
1821 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1822 m_freem(m);
1823 return (IPPROTO_DONE);
1824 }
1825
1826 eip6 = (struct ip6_hdr *) (reghdr + 1);
1827 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1828 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1829 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1830 ntohs(eip6->ip6_plen));
1831
1832 /* verify the version number of the inner packet */
1833 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1834 PIM6STAT_INC(pim6s_rcv_badregisters);
1835 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1836 "of the inner packet",
1837 (eip6->ip6_vfc & IPV6_VERSION));
1838 m_freem(m);
1839 return (IPPROTO_DONE);
1840 }
1841
1842 /* verify the inner packet is destined to a mcast group */
1843 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1844 PIM6STAT_INC(pim6s_rcv_badregisters);
1845 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1846 "is not multicast %s",
1847 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1848 m_freem(m);
1849 return (IPPROTO_DONE);
1850 }
1851
1852 /*
1853 * make a copy of the whole header to pass to the daemon later.
1854 */
1855 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
1856 if (mcp == NULL) {
1857 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1858 "could not copy register head");
1859 m_freem(m);
1860 return (IPPROTO_DONE);
1861 }
1862
1863 /*
1864 * forward the inner ip6 packet; point m_data at the inner ip6.
1865 */
1866 m_adj(m, off + PIM_MINLEN);
1867 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1868 "src %s, dst %s, mif %d",
1869 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1870 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1871
1872 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1873 dst.sin6_family, 0);
1874
1875 /* prepare the register head to send to the mrouting daemon */
1876 m = mcp;
1877 }
1878
1879 /*
1880 * Pass the PIM message up to the daemon; if it is a register message
1881 * pass the 'head' only up to the daemon. This includes the
1882 * encapsulator ip6 header, pim header, register header and the
1883 * encapsulated ip6 header.
1884 */
1885 pim6_input_to_daemon:
1886 return (rip6_input(&m, &off, proto));
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 = ip6_encap_attach(&ipv6_encap_cfg,
1900 NULL, M_WAITOK);
1901 if (pim6_encap_cookie == NULL) {
1902 printf("ip6_mroute: unable to attach pim6 encap\n");
1903 MIF6_LOCK_DESTROY();
1904 MFC6_LOCK_DESTROY();
1905 MROUTER6_LOCK_DESTROY();
1906 return (EINVAL);
1907 }
1908
1909 ip6_mforward = X_ip6_mforward;
1910 ip6_mrouter_done = X_ip6_mrouter_done;
1911 ip6_mrouter_get = X_ip6_mrouter_get;
1912 ip6_mrouter_set = X_ip6_mrouter_set;
1913 mrt6_ioctl = X_mrt6_ioctl;
1914 break;
1915
1916 case MOD_UNLOAD:
1917 if (V_ip6_mrouter != NULL)
1918 return EINVAL;
1919
1920 if (pim6_encap_cookie) {
1921 ip6_encap_detach(pim6_encap_cookie);
1922 pim6_encap_cookie = NULL;
1923 }
1924 X_ip6_mrouter_done();
1925 ip6_mforward = NULL;
1926 ip6_mrouter_done = NULL;
1927 ip6_mrouter_get = NULL;
1928 ip6_mrouter_set = NULL;
1929 mrt6_ioctl = NULL;
1930
1931 MIF6_LOCK_DESTROY();
1932 MFC6_LOCK_DESTROY();
1933 MROUTER6_LOCK_DESTROY();
1934 break;
1935
1936 default:
1937 return (EOPNOTSUPP);
1938 }
1939
1940 return (0);
1941 }
1942
1943 static moduledata_t ip6_mroutemod = {
1944 "ip6_mroute",
1945 ip6_mroute_modevent,
1946 0
1947 };
1948
1949 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);
1950