1 /*-
2 * Copyright (C) 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
30 */
31
32 /*-
33 * Copyright (c) 1989 Stephen Deering
34 * Copyright (c) 1992, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * Stephen Deering of Stanford University.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 4. Neither the name of the University nor the names of its contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * SUCH DAMAGE.
63 *
64 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
65 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
66 */
67
68 /*
69 * IP multicast forwarding procedures
70 *
71 * Written by David Waitzman, BBN Labs, August 1988.
72 * Modified by Steve Deering, Stanford, February 1989.
73 * Modified by Mark J. Steiglitz, Stanford, May, 1991
74 * Modified by Van Jacobson, LBL, January 1993
75 * Modified by Ajit Thyagarajan, PARC, August 1993
76 * Modified by Bill Fenner, PARC, April 1994
77 *
78 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
79 */
80
81 #include <sys/cdefs.h>
82 __FBSDID("$FreeBSD: releng/11.0/sys/netinet6/ip6_mroute.c 302054 2016-06-21 13:48:49Z bz $");
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/sdt.h>
97 #include <sys/signalvar.h>
98 #include <sys/socket.h>
99 #include <sys/socketvar.h>
100 #include <sys/sockio.h>
101 #include <sys/sx.h>
102 #include <sys/sysctl.h>
103 #include <sys/syslog.h>
104 #include <sys/systm.h>
105 #include <sys/time.h>
106
107 #include <net/if.h>
108 #include <net/if_var.h>
109 #include <net/if_types.h>
110 #include <net/raw_cb.h>
111 #include <net/vnet.h>
112
113 #include <netinet/in.h>
114 #include <netinet/in_var.h>
115 #include <netinet/icmp6.h>
116 #include <netinet/ip_encap.h>
117
118 #include <netinet/ip6.h>
119 #include <netinet/in_kdtrace.h>
120 #include <netinet6/ip6_var.h>
121 #include <netinet6/scope6_var.h>
122 #include <netinet6/nd6.h>
123 #include <netinet6/ip6_mroute.h>
124 #include <netinet6/pim6.h>
125 #include <netinet6/pim6_var.h>
126
127 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
128
129 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
130 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
131 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
132 static int set_pim6(int *);
133 static int socket_send(struct socket *, struct mbuf *,
134 struct sockaddr_in6 *);
135
136 extern int in6_mcast_loop;
137 extern struct domain inet6domain;
138
139 static const struct encaptab *pim6_encap_cookie;
140 static const struct protosw in6_pim_protosw = {
141 .pr_type = SOCK_RAW,
142 .pr_domain = &inet6domain,
143 .pr_protocol = IPPROTO_PIM,
144 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
145 .pr_input = pim6_input,
146 .pr_output = rip6_output,
147 .pr_ctloutput = rip6_ctloutput,
148 .pr_usrreqs = &rip6_usrreqs
149 };
150 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
151
152 static VNET_DEFINE(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, CTLFLAG_RW, 0, "PIM");
158
159 static struct mrt6stat mrt6stat;
160 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
161 &mrt6stat, mrt6stat,
162 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
163
164 #define MRT6STAT_INC(name) mrt6stat.name += 1
165 #define NO_RTE_FOUND 0x1
166 #define RTE_FOUND 0x2
167
168 static struct mtx mrouter6_mtx;
169 #define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
170 #define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
171 #define MROUTER6_LOCK_ASSERT() do { \
172 mtx_assert(&mrouter6_mtx, MA_OWNED); \
173 NET_ASSERT_GIANT(); \
174 } while (0)
175 #define MROUTER6_LOCK_INIT() \
176 mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
177 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
178
179 static struct mf6c *mf6ctable[MF6CTBLSIZ];
180 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
181 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
182 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
183 "netinet6/ip6_mroute.h)");
184
185 static struct mtx mfc6_mtx;
186 #define MFC6_LOCK() mtx_lock(&mfc6_mtx)
187 #define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
188 #define MFC6_LOCK_ASSERT() do { \
189 mtx_assert(&mfc6_mtx, MA_OWNED); \
190 NET_ASSERT_GIANT(); \
191 } while (0)
192 #define MFC6_LOCK_INIT() \
193 mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
194 #define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
195
196 static u_char n6expire[MF6CTBLSIZ];
197
198 static struct mif6 mif6table[MAXMIFS];
199 static int
200 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
201 {
202 struct mif6_sctl *out;
203 int error;
204
205 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, M_WAITOK);
206 for (int i = 0; i < MAXMIFS; i++) {
207 out[i].m6_flags = mif6table[i].m6_flags;
208 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
209 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
210 if (mif6table[i].m6_ifp != NULL)
211 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
212 else
213 out[i].m6_ifp = 0;
214 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
215 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
216 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
217 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
218 }
219 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
220 free(out, M_TEMP);
221 return (error);
222 }
223 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD,
224 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
225 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
226 "netinet6/ip6_mroute.h)");
227
228 static struct mtx mif6_mtx;
229 #define MIF6_LOCK() mtx_lock(&mif6_mtx)
230 #define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
231 #define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
232 #define MIF6_LOCK_INIT() \
233 mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
234 #define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
235
236 #ifdef MRT6DEBUG
237 static VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */
238 #define V_mrt6debug VNET(mrt6debug)
239 #define DEBUG_MFC 0x02
240 #define DEBUG_FORWARD 0x04
241 #define DEBUG_EXPIRE 0x08
242 #define DEBUG_XMIT 0x10
243 #define DEBUG_REG 0x20
244 #define DEBUG_PIM 0x40
245 #define DEBUG_ERR 0x80
246 #define DEBUG_ANY 0x7f
247 #define MRT6_DLOG(m, fmt, ...) \
248 if (V_mrt6debug & (m)) \
249 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
250 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
251 #else
252 #define MRT6_DLOG(m, fmt, ...)
253 #endif
254
255 static void expire_upcalls(void *);
256 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
257 #define UPCALL_EXPIRE 6 /* number of timeouts */
258
259 /*
260 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
261 */
262
263 /*
264 * 'Interfaces' associated with decapsulator (so we can tell
265 * packets that went through it from ones that get reflected
266 * by a broken gateway). Different from IPv4 register_if,
267 * these interfaces are linked into the system ifnet list,
268 * because per-interface IPv6 statistics are maintained in
269 * ifp->if_afdata. But it does not have any routes point
270 * to them. I.e., packets can't be sent this way. They
271 * only exist as a placeholder for multicast source
272 * verification.
273 */
274 static struct ifnet *multicast_register_if6;
275
276 #define ENCAP_HOPS 64
277
278 /*
279 * Private variables.
280 */
281 static mifi_t nummifs = 0;
282 static mifi_t reg_mif_num = (mifi_t)-1;
283
284 static struct pim6stat pim6stat;
285 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
286 &pim6stat, pim6stat,
287 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
288
289 #define PIM6STAT_INC(name) pim6stat.name += 1
290 static VNET_DEFINE(int, pim6);
291 #define V_pim6 VNET(pim6)
292
293 /*
294 * Hash function for a source, group entry
295 */
296 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
297 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
298 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
299 (g).s6_addr32[2] ^ (g).s6_addr32[3])
300
301 /*
302 * Find a route for a given origin IPv6 address and Multicast group address.
303 */
304 #define MF6CFIND(o, g, rt) do { \
305 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
306 rt = NULL; \
307 while (_rt) { \
308 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
309 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
310 (_rt->mf6c_stall == NULL)) { \
311 rt = _rt; \
312 break; \
313 } \
314 _rt = _rt->mf6c_next; \
315 } \
316 if (rt == NULL) { \
317 MRT6STAT_INC(mrt6s_mfc_misses); \
318 } \
319 } while (/*CONSTCOND*/ 0)
320
321 /*
322 * Macros to compute elapsed time efficiently
323 * Borrowed from Van Jacobson's scheduling code
324 * XXX: replace with timersub() ?
325 */
326 #define TV_DELTA(a, b, delta) do { \
327 int xxs; \
328 \
329 delta = (a).tv_usec - (b).tv_usec; \
330 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
331 switch (xxs) { \
332 case 2: \
333 delta += 1000000; \
334 /* FALLTHROUGH */ \
335 case 1: \
336 delta += 1000000; \
337 break; \
338 default: \
339 delta += (1000000 * xxs); \
340 } \
341 } \
342 } while (/*CONSTCOND*/ 0)
343
344 /* XXX: replace with timercmp(a, b, <) ? */
345 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
346 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
347
348 #ifdef UPCALL_TIMING
349 #define UPCALL_MAX 50
350 static u_long upcall_data[UPCALL_MAX + 1];
351 static void collate();
352 #endif /* UPCALL_TIMING */
353
354 static int ip6_mrouter_init(struct socket *, int, int);
355 static int add_m6fc(struct mf6cctl *);
356 static int add_m6if(struct mif6ctl *);
357 static int del_m6fc(struct mf6cctl *);
358 static int del_m6if(mifi_t *);
359 static int del_m6if_locked(mifi_t *);
360 static int get_mif6_cnt(struct sioc_mif_req6 *);
361 static int get_sg_cnt(struct sioc_sg_req6 *);
362
363 static struct callout expire_upcalls_ch;
364
365 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
366 int X_ip6_mrouter_done(void);
367 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
368 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
369 int X_mrt6_ioctl(u_long, caddr_t);
370
371 /*
372 * Handle MRT setsockopt commands to modify the multicast routing tables.
373 */
374 int
375 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
376 {
377 int error = 0;
378 int optval;
379 struct mif6ctl mifc;
380 struct mf6cctl mfcc;
381 mifi_t mifi;
382
383 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
384 return (EPERM);
385
386 switch (sopt->sopt_name) {
387 case MRT6_INIT:
388 #ifdef MRT6_OINIT
389 case MRT6_OINIT:
390 #endif
391 error = sooptcopyin(sopt, &optval, sizeof(optval),
392 sizeof(optval));
393 if (error)
394 break;
395 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
396 break;
397 case MRT6_DONE:
398 error = X_ip6_mrouter_done();
399 break;
400 case MRT6_ADD_MIF:
401 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
402 if (error)
403 break;
404 error = add_m6if(&mifc);
405 break;
406 case MRT6_ADD_MFC:
407 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
408 if (error)
409 break;
410 error = add_m6fc(&mfcc);
411 break;
412 case MRT6_DEL_MFC:
413 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
414 if (error)
415 break;
416 error = del_m6fc(&mfcc);
417 break;
418 case MRT6_DEL_MIF:
419 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
420 if (error)
421 break;
422 error = del_m6if(&mifi);
423 break;
424 case MRT6_PIM:
425 error = sooptcopyin(sopt, &optval, sizeof(optval),
426 sizeof(optval));
427 if (error)
428 break;
429 error = set_pim6(&optval);
430 break;
431 default:
432 error = EOPNOTSUPP;
433 break;
434 }
435
436 return (error);
437 }
438
439 /*
440 * Handle MRT getsockopt commands
441 */
442 int
443 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
444 {
445 int error = 0;
446
447 if (so != V_ip6_mrouter)
448 return (EACCES);
449
450 switch (sopt->sopt_name) {
451 case MRT6_PIM:
452 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
453 break;
454 }
455 return (error);
456 }
457
458 /*
459 * Handle ioctl commands to obtain information from the cache
460 */
461 int
462 X_mrt6_ioctl(u_long cmd, caddr_t data)
463 {
464 int ret;
465
466 ret = EINVAL;
467
468 switch (cmd) {
469 case SIOCGETSGCNT_IN6:
470 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
471 break;
472
473 case SIOCGETMIFCNT_IN6:
474 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
475 break;
476
477 default:
478 break;
479 }
480
481 return (ret);
482 }
483
484 /*
485 * returns the packet, byte, rpf-failure count for the source group provided
486 */
487 static int
488 get_sg_cnt(struct sioc_sg_req6 *req)
489 {
490 struct mf6c *rt;
491 int ret;
492
493 ret = 0;
494
495 MFC6_LOCK();
496
497 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
498 if (rt == NULL) {
499 ret = ESRCH;
500 } else {
501 req->pktcnt = rt->mf6c_pkt_cnt;
502 req->bytecnt = rt->mf6c_byte_cnt;
503 req->wrong_if = rt->mf6c_wrong_if;
504 }
505
506 MFC6_UNLOCK();
507
508 return (ret);
509 }
510
511 /*
512 * returns the input and output packet and byte counts on the mif provided
513 */
514 static int
515 get_mif6_cnt(struct sioc_mif_req6 *req)
516 {
517 mifi_t mifi;
518 int ret;
519
520 ret = 0;
521 mifi = req->mifi;
522
523 MIF6_LOCK();
524
525 if (mifi >= nummifs) {
526 ret = EINVAL;
527 } else {
528 req->icount = mif6table[mifi].m6_pkt_in;
529 req->ocount = mif6table[mifi].m6_pkt_out;
530 req->ibytes = mif6table[mifi].m6_bytes_in;
531 req->obytes = mif6table[mifi].m6_bytes_out;
532 }
533
534 MIF6_UNLOCK();
535
536 return (ret);
537 }
538
539 static int
540 set_pim6(int *i)
541 {
542 if ((*i != 1) && (*i != 0))
543 return (EINVAL);
544
545 V_pim6 = *i;
546
547 return (0);
548 }
549
550 /*
551 * Enable multicast routing
552 */
553 static int
554 ip6_mrouter_init(struct socket *so, int v, int cmd)
555 {
556
557 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
558 so->so_type, so->so_proto->pr_protocol);
559
560 if (so->so_type != SOCK_RAW ||
561 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
562 return (EOPNOTSUPP);
563
564 if (v != 1)
565 return (ENOPROTOOPT);
566
567 MROUTER6_LOCK();
568
569 if (V_ip6_mrouter != NULL) {
570 MROUTER6_UNLOCK();
571 return (EADDRINUSE);
572 }
573
574 V_ip6_mrouter = so;
575 V_ip6_mrouter_ver = cmd;
576
577 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
578 bzero((caddr_t)n6expire, sizeof(n6expire));
579
580 V_pim6 = 0;/* used for stubbing out/in pim stuff */
581
582 callout_init(&expire_upcalls_ch, 0);
583 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
584 expire_upcalls, NULL);
585
586 MROUTER6_UNLOCK();
587 MRT6_DLOG(DEBUG_ANY, "finished");
588
589 return (0);
590 }
591
592 /*
593 * Disable IPv6 multicast forwarding.
594 */
595 int
596 X_ip6_mrouter_done(void)
597 {
598 mifi_t mifi;
599 u_long i;
600 struct mf6c *rt;
601 struct rtdetq *rte;
602
603 MROUTER6_LOCK();
604
605 if (V_ip6_mrouter == NULL) {
606 MROUTER6_UNLOCK();
607 return (EINVAL);
608 }
609
610 /*
611 * For each phyint in use, disable promiscuous reception of all IPv6
612 * multicasts.
613 */
614 for (mifi = 0; mifi < nummifs; mifi++) {
615 if (mif6table[mifi].m6_ifp &&
616 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
617 if_allmulti(mif6table[mifi].m6_ifp, 0);
618 }
619 }
620 bzero((caddr_t)mif6table, sizeof(mif6table));
621 nummifs = 0;
622
623 V_pim6 = 0; /* used to stub out/in pim specific code */
624
625 callout_stop(&expire_upcalls_ch);
626
627 /*
628 * Free all multicast forwarding cache entries.
629 */
630 MFC6_LOCK();
631 for (i = 0; i < MF6CTBLSIZ; i++) {
632 rt = mf6ctable[i];
633 while (rt) {
634 struct mf6c *frt;
635
636 for (rte = rt->mf6c_stall; rte != NULL; ) {
637 struct rtdetq *n = rte->next;
638
639 m_freem(rte->m);
640 free(rte, M_MRTABLE6);
641 rte = n;
642 }
643 frt = rt;
644 rt = rt->mf6c_next;
645 free(frt, M_MRTABLE6);
646 }
647 }
648 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
649 MFC6_UNLOCK();
650
651 /*
652 * Reset register interface
653 */
654 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
655 if_detach(multicast_register_if6);
656 if_free(multicast_register_if6);
657 reg_mif_num = (mifi_t)-1;
658 multicast_register_if6 = NULL;
659 }
660
661 V_ip6_mrouter = NULL;
662 V_ip6_mrouter_ver = 0;
663
664 MROUTER6_UNLOCK();
665 MRT6_DLOG(DEBUG_ANY, "finished");
666
667 return (0);
668 }
669
670 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
671
672 /*
673 * Add a mif to the mif table
674 */
675 static int
676 add_m6if(struct mif6ctl *mifcp)
677 {
678 struct mif6 *mifp;
679 struct ifnet *ifp;
680 int error;
681
682 MIF6_LOCK();
683
684 if (mifcp->mif6c_mifi >= MAXMIFS) {
685 MIF6_UNLOCK();
686 return (EINVAL);
687 }
688 mifp = mif6table + mifcp->mif6c_mifi;
689 if (mifp->m6_ifp != NULL) {
690 MIF6_UNLOCK();
691 return (EADDRINUSE); /* XXX: is it appropriate? */
692 }
693 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
694 MIF6_UNLOCK();
695 return (ENXIO);
696 }
697
698 ifp = ifnet_byindex(mifcp->mif6c_pifi);
699
700 if (mifcp->mif6c_flags & MIFF_REGISTER) {
701 if (reg_mif_num == (mifi_t)-1) {
702 ifp = if_alloc(IFT_OTHER);
703
704 if_initname(ifp, "register_mif", 0);
705 ifp->if_flags |= IFF_LOOPBACK;
706 if_attach(ifp);
707 multicast_register_if6 = ifp;
708 reg_mif_num = mifcp->mif6c_mifi;
709 /*
710 * it is impossible to guess the ifindex of the
711 * register interface. So mif6c_pifi is automatically
712 * calculated.
713 */
714 mifcp->mif6c_pifi = ifp->if_index;
715 } else {
716 ifp = multicast_register_if6;
717 }
718 } else {
719 /* Make sure the interface supports multicast */
720 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
721 MIF6_UNLOCK();
722 return (EOPNOTSUPP);
723 }
724
725 error = if_allmulti(ifp, 1);
726 if (error) {
727 MIF6_UNLOCK();
728 return (error);
729 }
730 }
731
732 mifp->m6_flags = mifcp->mif6c_flags;
733 mifp->m6_ifp = ifp;
734
735 /* initialize per mif pkt counters */
736 mifp->m6_pkt_in = 0;
737 mifp->m6_pkt_out = 0;
738 mifp->m6_bytes_in = 0;
739 mifp->m6_bytes_out = 0;
740
741 /* Adjust nummifs up if the mifi is higher than nummifs */
742 if (nummifs <= mifcp->mif6c_mifi)
743 nummifs = mifcp->mif6c_mifi + 1;
744
745 MIF6_UNLOCK();
746 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
747 if_name(ifp));
748
749 return (0);
750 }
751
752 /*
753 * Delete a mif from the mif table
754 */
755 static int
756 del_m6if_locked(mifi_t *mifip)
757 {
758 struct mif6 *mifp = mif6table + *mifip;
759 mifi_t mifi;
760 struct ifnet *ifp;
761
762 MIF6_LOCK_ASSERT();
763
764 if (*mifip >= nummifs)
765 return (EINVAL);
766 if (mifp->m6_ifp == NULL)
767 return (EINVAL);
768
769 if (!(mifp->m6_flags & MIFF_REGISTER)) {
770 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
771 ifp = mifp->m6_ifp;
772 if_allmulti(ifp, 0);
773 } else {
774 if (reg_mif_num != (mifi_t)-1 &&
775 multicast_register_if6 != NULL) {
776 if_detach(multicast_register_if6);
777 if_free(multicast_register_if6);
778 reg_mif_num = (mifi_t)-1;
779 multicast_register_if6 = NULL;
780 }
781 }
782
783 bzero((caddr_t)mifp, sizeof(*mifp));
784
785 /* Adjust nummifs down */
786 for (mifi = nummifs; mifi > 0; mifi--)
787 if (mif6table[mifi - 1].m6_ifp)
788 break;
789 nummifs = mifi;
790 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
791
792 return (0);
793 }
794
795 static int
796 del_m6if(mifi_t *mifip)
797 {
798 int cc;
799
800 MIF6_LOCK();
801 cc = del_m6if_locked(mifip);
802 MIF6_UNLOCK();
803
804 return (cc);
805 }
806
807 /*
808 * Add an mfc entry
809 */
810 static int
811 add_m6fc(struct mf6cctl *mfccp)
812 {
813 struct mf6c *rt;
814 u_long hash;
815 struct rtdetq *rte;
816 u_short nstl;
817 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
818
819 MFC6_LOCK();
820
821 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
822 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
823
824 /* If an entry already exists, just update the fields */
825 if (rt) {
826 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
827 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
828 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
829 mfccp->mf6cc_parent);
830
831 rt->mf6c_parent = mfccp->mf6cc_parent;
832 rt->mf6c_ifset = mfccp->mf6cc_ifset;
833
834 MFC6_UNLOCK();
835 return (0);
836 }
837
838 /*
839 * Find the entry for which the upcall was made and update
840 */
841 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
842 mfccp->mf6cc_mcastgrp.sin6_addr);
843 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
844 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
845 &mfccp->mf6cc_origin.sin6_addr) &&
846 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
847 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
848 (rt->mf6c_stall != NULL)) {
849
850 if (nstl++)
851 log(LOG_ERR,
852 "add_m6fc: %s o %s g %s p %x dbx %p\n",
853 "multiple kernel entries",
854 ip6_sprintf(ip6bufo,
855 &mfccp->mf6cc_origin.sin6_addr),
856 ip6_sprintf(ip6bufg,
857 &mfccp->mf6cc_mcastgrp.sin6_addr),
858 mfccp->mf6cc_parent, rt->mf6c_stall);
859
860 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
861 ip6_sprintf(ip6bufo,
862 &mfccp->mf6cc_origin.sin6_addr),
863 ip6_sprintf(ip6bufg,
864 &mfccp->mf6cc_mcastgrp.sin6_addr),
865 mfccp->mf6cc_parent, rt->mf6c_stall);
866
867 rt->mf6c_origin = mfccp->mf6cc_origin;
868 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
869 rt->mf6c_parent = mfccp->mf6cc_parent;
870 rt->mf6c_ifset = mfccp->mf6cc_ifset;
871 /* initialize pkt counters per src-grp */
872 rt->mf6c_pkt_cnt = 0;
873 rt->mf6c_byte_cnt = 0;
874 rt->mf6c_wrong_if = 0;
875
876 rt->mf6c_expire = 0; /* Don't clean this guy up */
877 n6expire[hash]--;
878
879 /* free packets Qed at the end of this entry */
880 for (rte = rt->mf6c_stall; rte != NULL; ) {
881 struct rtdetq *n = rte->next;
882 ip6_mdq(rte->m, rte->ifp, rt);
883 m_freem(rte->m);
884 #ifdef UPCALL_TIMING
885 collate(&(rte->t));
886 #endif /* UPCALL_TIMING */
887 free(rte, M_MRTABLE6);
888 rte = n;
889 }
890 rt->mf6c_stall = NULL;
891 }
892 }
893
894 /*
895 * It is possible that an entry is being inserted without an upcall
896 */
897 if (nstl == 0) {
898 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
899 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
900 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
901 mfccp->mf6cc_parent);
902
903 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
904
905 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
906 &mfccp->mf6cc_origin.sin6_addr)&&
907 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
908 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
909
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
919 if (rt->mf6c_expire)
920 n6expire[hash]--;
921 rt->mf6c_expire = 0;
922 }
923 }
924 if (rt == NULL) {
925 /* no upcall, so make a new entry */
926 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
927 M_NOWAIT);
928 if (rt == NULL) {
929 MFC6_UNLOCK();
930 return (ENOBUFS);
931 }
932
933 /* insert new entry at head of hash chain */
934 rt->mf6c_origin = mfccp->mf6cc_origin;
935 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
936 rt->mf6c_parent = mfccp->mf6cc_parent;
937 rt->mf6c_ifset = mfccp->mf6cc_ifset;
938 /* initialize pkt counters per src-grp */
939 rt->mf6c_pkt_cnt = 0;
940 rt->mf6c_byte_cnt = 0;
941 rt->mf6c_wrong_if = 0;
942 rt->mf6c_expire = 0;
943 rt->mf6c_stall = NULL;
944
945 /* link into table */
946 rt->mf6c_next = mf6ctable[hash];
947 mf6ctable[hash] = rt;
948 }
949 }
950
951 MFC6_UNLOCK();
952 return (0);
953 }
954
955 #ifdef UPCALL_TIMING
956 /*
957 * collect delay statistics on the upcalls
958 */
959 static void
960 collate(struct timeval *t)
961 {
962 u_long d;
963 struct timeval tp;
964 u_long delta;
965
966 GET_TIME(tp);
967
968 if (TV_LT(*t, tp))
969 {
970 TV_DELTA(tp, *t, delta);
971
972 d = delta >> 10;
973 if (d > UPCALL_MAX)
974 d = UPCALL_MAX;
975
976 ++upcall_data[d];
977 }
978 }
979 #endif /* UPCALL_TIMING */
980
981 /*
982 * Delete an mfc entry
983 */
984 static int
985 del_m6fc(struct mf6cctl *mfccp)
986 {
987 #ifdef MRT6DEBUG
988 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
989 #endif
990 struct sockaddr_in6 origin;
991 struct sockaddr_in6 mcastgrp;
992 struct mf6c *rt;
993 struct mf6c **nptr;
994 u_long hash;
995
996 origin = mfccp->mf6cc_origin;
997 mcastgrp = mfccp->mf6cc_mcastgrp;
998 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
999
1000 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
1001 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1002 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1003
1004 MFC6_LOCK();
1005
1006 nptr = &mf6ctable[hash];
1007 while ((rt = *nptr) != NULL) {
1008 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1009 &rt->mf6c_origin.sin6_addr) &&
1010 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1011 &rt->mf6c_mcastgrp.sin6_addr) &&
1012 rt->mf6c_stall == NULL)
1013 break;
1014
1015 nptr = &rt->mf6c_next;
1016 }
1017 if (rt == NULL) {
1018 MFC6_UNLOCK();
1019 return (EADDRNOTAVAIL);
1020 }
1021
1022 *nptr = rt->mf6c_next;
1023 free(rt, M_MRTABLE6);
1024
1025 MFC6_UNLOCK();
1026
1027 return (0);
1028 }
1029
1030 static int
1031 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1032 {
1033
1034 if (s) {
1035 if (sbappendaddr(&s->so_rcv,
1036 (struct sockaddr *)src,
1037 mm, (struct mbuf *)0) != 0) {
1038 sorwakeup(s);
1039 return (0);
1040 }
1041 }
1042 m_freem(mm);
1043 return (-1);
1044 }
1045
1046 /*
1047 * IPv6 multicast forwarding function. This function assumes that the packet
1048 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1049 * pointed to by "ifp", and the packet is to be relayed to other networks
1050 * that have members of the packet's destination IPv6 multicast group.
1051 *
1052 * The packet is returned unscathed to the caller, unless it is
1053 * erroneous, in which case a non-zero return value tells the caller to
1054 * discard it.
1055 *
1056 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1057 * this function is called in the originating context (i.e., not when
1058 * forwarding a packet from other node). ip6_output(), which is currently the
1059 * only function that calls this function is called in the originating context,
1060 * explicitly ensures this condition. It is caller's responsibility to ensure
1061 * that if this function is called from somewhere else in the originating
1062 * context in the future.
1063 */
1064 int
1065 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1066 {
1067 struct rtdetq *rte;
1068 struct mbuf *mb0;
1069 struct mf6c *rt;
1070 struct mif6 *mifp;
1071 struct mbuf *mm;
1072 u_long hash;
1073 mifi_t mifi;
1074 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1075 #ifdef UPCALL_TIMING
1076 struct timeval tp;
1077
1078 GET_TIME(tp);
1079 #endif /* UPCALL_TIMING */
1080
1081 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1082 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1083 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1084
1085 /*
1086 * Don't forward a packet with Hop limit of zero or one,
1087 * or a packet destined to a local-only group.
1088 */
1089 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1090 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1091 return (0);
1092 ip6->ip6_hlim--;
1093
1094 /*
1095 * Source address check: do not forward packets with unspecified
1096 * source. It was discussed in July 2000, on ipngwg mailing list.
1097 * This is rather more serious than unicast cases, because some
1098 * MLD packets can be sent with the unspecified source address
1099 * (although such packets must normally set 1 to the hop limit field).
1100 */
1101 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1102 IP6STAT_INC(ip6s_cantforward);
1103 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1104 V_ip6_log_time = time_uptime;
1105 log(LOG_DEBUG,
1106 "cannot forward "
1107 "from %s to %s nxt %d received on %s\n",
1108 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1109 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1110 ip6->ip6_nxt,
1111 if_name(m->m_pkthdr.rcvif));
1112 }
1113 return (0);
1114 }
1115
1116 MFC6_LOCK();
1117
1118 /*
1119 * Determine forwarding mifs from the forwarding cache table
1120 */
1121 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1122 MRT6STAT_INC(mrt6s_mfc_lookups);
1123
1124 /* Entry exists, so forward if necessary */
1125 if (rt) {
1126 MFC6_UNLOCK();
1127 return (ip6_mdq(m, ifp, rt));
1128 }
1129
1130 /*
1131 * If we don't have a route for packet's origin,
1132 * Make a copy of the packet & send message to routing daemon.
1133 */
1134 MRT6STAT_INC(mrt6s_no_route);
1135 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1136 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1137 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1138
1139 /*
1140 * Allocate mbufs early so that we don't do extra work if we
1141 * are just going to fail anyway.
1142 */
1143 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1144 if (rte == NULL) {
1145 MFC6_UNLOCK();
1146 return (ENOBUFS);
1147 }
1148 mb0 = m_copy(m, 0, M_COPYALL);
1149 /*
1150 * Pullup packet header if needed before storing it,
1151 * as other references may modify it in the meantime.
1152 */
1153 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1154 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1155 if (mb0 == NULL) {
1156 free(rte, M_MRTABLE6);
1157 MFC6_UNLOCK();
1158 return (ENOBUFS);
1159 }
1160
1161 /* is there an upcall waiting for this packet? */
1162 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1163 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1164 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1165 &rt->mf6c_origin.sin6_addr) &&
1166 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1167 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1168 break;
1169 }
1170
1171 if (rt == NULL) {
1172 struct mrt6msg *im;
1173 #ifdef MRT6_OINIT
1174 struct omrt6msg *oim;
1175 #endif
1176 /* no upcall, so make a new entry */
1177 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1178 if (rt == NULL) {
1179 free(rte, M_MRTABLE6);
1180 m_freem(mb0);
1181 MFC6_UNLOCK();
1182 return (ENOBUFS);
1183 }
1184 /*
1185 * Make a copy of the header to send to the user
1186 * level process
1187 */
1188 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1189 if (mm == NULL) {
1190 free(rte, M_MRTABLE6);
1191 m_freem(mb0);
1192 free(rt, M_MRTABLE6);
1193 MFC6_UNLOCK();
1194 return (ENOBUFS);
1195 }
1196
1197 /*
1198 * Send message to routing daemon
1199 */
1200 sin6.sin6_addr = ip6->ip6_src;
1201 im = NULL;
1202 #ifdef MRT6_OINIT
1203 oim = NULL;
1204 #endif
1205 switch (V_ip6_mrouter_ver) {
1206 #ifdef MRT6_OINIT
1207 case MRT6_OINIT:
1208 oim = mtod(mm, struct omrt6msg *);
1209 oim->im6_msgtype = MRT6MSG_NOCACHE;
1210 oim->im6_mbz = 0;
1211 break;
1212 #endif
1213 case MRT6_INIT:
1214 im = mtod(mm, struct mrt6msg *);
1215 im->im6_msgtype = MRT6MSG_NOCACHE;
1216 im->im6_mbz = 0;
1217 break;
1218 default:
1219 free(rte, M_MRTABLE6);
1220 m_freem(mb0);
1221 free(rt, M_MRTABLE6);
1222 MFC6_UNLOCK();
1223 return (EINVAL);
1224 }
1225
1226 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1227 for (mifp = mif6table, mifi = 0;
1228 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1229 ;
1230
1231 switch (V_ip6_mrouter_ver) {
1232 #ifdef MRT6_OINIT
1233 case MRT6_OINIT:
1234 oim->im6_mif = mifi;
1235 break;
1236 #endif
1237 case MRT6_INIT:
1238 im->im6_mif = mifi;
1239 break;
1240 }
1241
1242 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1243 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1244 "socket queue full\n");
1245 MRT6STAT_INC(mrt6s_upq_sockfull);
1246 free(rte, M_MRTABLE6);
1247 m_freem(mb0);
1248 free(rt, M_MRTABLE6);
1249 MFC6_UNLOCK();
1250 return (ENOBUFS);
1251 }
1252
1253 MRT6STAT_INC(mrt6s_upcalls);
1254
1255 /* insert new entry at head of hash chain */
1256 bzero(rt, sizeof(*rt));
1257 rt->mf6c_origin.sin6_family = AF_INET6;
1258 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1259 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1260 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1261 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1262 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1263 rt->mf6c_expire = UPCALL_EXPIRE;
1264 n6expire[hash]++;
1265 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1266
1267 /* link into table */
1268 rt->mf6c_next = mf6ctable[hash];
1269 mf6ctable[hash] = rt;
1270 /* Add this entry to the end of the queue */
1271 rt->mf6c_stall = rte;
1272 } else {
1273 /* determine if q has overflowed */
1274 struct rtdetq **p;
1275 int npkts = 0;
1276
1277 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1278 if (++npkts > MAX_UPQ6) {
1279 MRT6STAT_INC(mrt6s_upq_ovflw);
1280 free(rte, M_MRTABLE6);
1281 m_freem(mb0);
1282 MFC6_UNLOCK();
1283 return (0);
1284 }
1285
1286 /* Add this entry to the end of the queue */
1287 *p = rte;
1288 }
1289
1290 rte->next = NULL;
1291 rte->m = mb0;
1292 rte->ifp = ifp;
1293 #ifdef UPCALL_TIMING
1294 rte->t = tp;
1295 #endif /* UPCALL_TIMING */
1296
1297 MFC6_UNLOCK();
1298
1299 return (0);
1300 }
1301
1302 /*
1303 * Clean up cache entries if upcalls are not serviced
1304 * Call from the Slow Timeout mechanism, every half second.
1305 */
1306 static void
1307 expire_upcalls(void *unused)
1308 {
1309 #ifdef MRT6DEBUG
1310 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1311 #endif
1312 struct rtdetq *rte;
1313 struct mf6c *mfc, **nptr;
1314 u_long i;
1315
1316 MFC6_LOCK();
1317 for (i = 0; i < MF6CTBLSIZ; i++) {
1318 if (n6expire[i] == 0)
1319 continue;
1320 nptr = &mf6ctable[i];
1321 while ((mfc = *nptr) != NULL) {
1322 rte = mfc->mf6c_stall;
1323 /*
1324 * Skip real cache entries
1325 * Make sure it wasn't marked to not expire (shouldn't happen)
1326 * If it expires now
1327 */
1328 if (rte != NULL &&
1329 mfc->mf6c_expire != 0 &&
1330 --mfc->mf6c_expire == 0) {
1331 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1332 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1333 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1334 /*
1335 * drop all the packets
1336 * free the mbuf with the pkt, if, timing info
1337 */
1338 do {
1339 struct rtdetq *n = rte->next;
1340 m_freem(rte->m);
1341 free(rte, M_MRTABLE6);
1342 rte = n;
1343 } while (rte != NULL);
1344 MRT6STAT_INC(mrt6s_cache_cleanups);
1345 n6expire[i]--;
1346
1347 *nptr = mfc->mf6c_next;
1348 free(mfc, M_MRTABLE6);
1349 } else {
1350 nptr = &mfc->mf6c_next;
1351 }
1352 }
1353 }
1354 MFC6_UNLOCK();
1355 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1356 expire_upcalls, NULL);
1357 }
1358
1359 /*
1360 * Packet forwarding routine once entry in the cache is made
1361 */
1362 static int
1363 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1364 {
1365 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1366 mifi_t mifi, iif;
1367 struct mif6 *mifp;
1368 int plen = m->m_pkthdr.len;
1369 struct in6_addr src0, dst0; /* copies for local work */
1370 u_int32_t iszone, idzone, oszone, odzone;
1371 int error = 0;
1372
1373 /*
1374 * Macro to send packet on mif. Since RSVP packets don't get counted on
1375 * input, they shouldn't get counted on output, so statistics keeping is
1376 * separate.
1377 */
1378
1379 #define MC6_SEND(ip6, mifp, m) do { \
1380 if ((mifp)->m6_flags & MIFF_REGISTER) \
1381 register_send((ip6), (mifp), (m)); \
1382 else \
1383 phyint_send((ip6), (mifp), (m)); \
1384 } while (/*CONSTCOND*/ 0)
1385
1386 /*
1387 * Don't forward if it didn't arrive from the parent mif
1388 * for its origin.
1389 */
1390 mifi = rt->mf6c_parent;
1391 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1392 /* came in the wrong interface */
1393 MRT6_DLOG(DEBUG_FORWARD,
1394 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1395 mifi, mif6table[mifi].m6_ifp->if_index);
1396 MRT6STAT_INC(mrt6s_wrong_if);
1397 rt->mf6c_wrong_if++;
1398 /*
1399 * If we are doing PIM processing, and we are forwarding
1400 * packets on this interface, send a message to the
1401 * routing daemon.
1402 */
1403 /* have to make sure this is a valid mif */
1404 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1405 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1406 /*
1407 * Check the M_LOOP flag to avoid an
1408 * unnecessary PIM assert.
1409 * XXX: M_LOOP is an ad-hoc hack...
1410 */
1411 static struct sockaddr_in6 sin6 =
1412 { sizeof(sin6), AF_INET6 };
1413
1414 struct mbuf *mm;
1415 struct mrt6msg *im;
1416 #ifdef MRT6_OINIT
1417 struct omrt6msg *oim;
1418 #endif
1419
1420 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1421 if (mm &&
1422 (!M_WRITABLE(mm) ||
1423 mm->m_len < sizeof(struct ip6_hdr)))
1424 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1425 if (mm == NULL)
1426 return (ENOBUFS);
1427
1428 #ifdef MRT6_OINIT
1429 oim = NULL;
1430 #endif
1431 im = NULL;
1432 switch (V_ip6_mrouter_ver) {
1433 #ifdef MRT6_OINIT
1434 case MRT6_OINIT:
1435 oim = mtod(mm, struct omrt6msg *);
1436 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1437 oim->im6_mbz = 0;
1438 break;
1439 #endif
1440 case MRT6_INIT:
1441 im = mtod(mm, struct mrt6msg *);
1442 im->im6_msgtype = MRT6MSG_WRONGMIF;
1443 im->im6_mbz = 0;
1444 break;
1445 default:
1446 m_freem(mm);
1447 return (EINVAL);
1448 }
1449
1450 for (mifp = mif6table, iif = 0;
1451 iif < nummifs && mifp &&
1452 mifp->m6_ifp != ifp;
1453 mifp++, iif++)
1454 ;
1455
1456 switch (V_ip6_mrouter_ver) {
1457 #ifdef MRT6_OINIT
1458 case MRT6_OINIT:
1459 oim->im6_mif = iif;
1460 sin6.sin6_addr = oim->im6_src;
1461 break;
1462 #endif
1463 case MRT6_INIT:
1464 im->im6_mif = iif;
1465 sin6.sin6_addr = im->im6_src;
1466 break;
1467 }
1468
1469 MRT6STAT_INC(mrt6s_upcalls);
1470
1471 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1472 MRT6_DLOG(DEBUG_ANY,
1473 "ip6_mrouter socket queue full");
1474 MRT6STAT_INC(mrt6s_upq_sockfull);
1475 return (ENOBUFS);
1476 } /* if socket Q full */
1477 } /* if PIM */
1478 return (0);
1479 } /* if wrong iif */
1480
1481 /* If I sourced this packet, it counts as output, else it was input. */
1482 if (m->m_pkthdr.rcvif == NULL) {
1483 /* XXX: is rcvif really NULL when output?? */
1484 mif6table[mifi].m6_pkt_out++;
1485 mif6table[mifi].m6_bytes_out += plen;
1486 } else {
1487 mif6table[mifi].m6_pkt_in++;
1488 mif6table[mifi].m6_bytes_in += plen;
1489 }
1490 rt->mf6c_pkt_cnt++;
1491 rt->mf6c_byte_cnt += plen;
1492
1493 /*
1494 * For each mif, forward a copy of the packet if there are group
1495 * members downstream on the interface.
1496 */
1497 src0 = ip6->ip6_src;
1498 dst0 = ip6->ip6_dst;
1499 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1500 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1501 IP6STAT_INC(ip6s_badscope);
1502 return (error);
1503 }
1504 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1505 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1506 /*
1507 * check if the outgoing packet is going to break
1508 * a scope boundary.
1509 * XXX For packets through PIM register tunnel
1510 * interface, we believe a routing daemon.
1511 */
1512 if (!(mif6table[rt->mf6c_parent].m6_flags &
1513 MIFF_REGISTER) &&
1514 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1515 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1516 &oszone) ||
1517 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1518 &odzone) ||
1519 iszone != oszone ||
1520 idzone != odzone) {
1521 IP6STAT_INC(ip6s_badscope);
1522 continue;
1523 }
1524 }
1525
1526 mifp->m6_pkt_out++;
1527 mifp->m6_bytes_out += plen;
1528 MC6_SEND(ip6, mifp, m);
1529 }
1530 }
1531 return (0);
1532 }
1533
1534 static void
1535 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1536 {
1537 #ifdef MRT6DEBUG
1538 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1539 #endif
1540 struct mbuf *mb_copy;
1541 struct ifnet *ifp = mifp->m6_ifp;
1542 int error = 0;
1543 u_long linkmtu;
1544
1545 /*
1546 * Make a new reference to the packet; make sure that
1547 * the IPv6 header is actually copied, not just referenced,
1548 * so that ip6_output() only scribbles on the copy.
1549 */
1550 mb_copy = m_copy(m, 0, M_COPYALL);
1551 if (mb_copy &&
1552 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1553 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1554 if (mb_copy == NULL) {
1555 return;
1556 }
1557 /* set MCAST flag to the outgoing packet */
1558 mb_copy->m_flags |= M_MCAST;
1559
1560 /*
1561 * If we sourced the packet, call ip6_output since we may devide
1562 * the packet into fragments when the packet is too big for the
1563 * outgoing interface.
1564 * Otherwise, we can simply send the packet to the interface
1565 * sending queue.
1566 */
1567 if (m->m_pkthdr.rcvif == NULL) {
1568 struct ip6_moptions im6o;
1569
1570 im6o.im6o_multicast_ifp = ifp;
1571 /* XXX: ip6_output will override ip6->ip6_hlim */
1572 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1573 im6o.im6o_multicast_loop = 1;
1574 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1575 NULL, NULL);
1576
1577 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1578 (uint16_t)(mifp - mif6table), error);
1579 return;
1580 }
1581
1582 /*
1583 * If configured to loop back multicasts by default,
1584 * loop back a copy now.
1585 */
1586 if (in6_mcast_loop)
1587 ip6_mloopback(ifp, m);
1588
1589 /*
1590 * Put the packet into the sending queue of the outgoing interface
1591 * if it would fit in the MTU of the interface.
1592 */
1593 linkmtu = IN6_LINKMTU(ifp);
1594 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1595 struct sockaddr_in6 dst6;
1596
1597 bzero(&dst6, sizeof(dst6));
1598 dst6.sin6_len = sizeof(struct sockaddr_in6);
1599 dst6.sin6_family = AF_INET6;
1600 dst6.sin6_addr = ip6->ip6_dst;
1601
1602 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1603 /*
1604 * We just call if_output instead of nd6_output here, since
1605 * we need no ND for a multicast forwarded packet...right?
1606 */
1607 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1608 error = (*ifp->if_output)(ifp, mb_copy,
1609 (struct sockaddr *)&dst6, NULL);
1610 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1611 (uint16_t)(mifp - mif6table), error);
1612 } else {
1613 /*
1614 * pMTU discovery is intentionally disabled by default, since
1615 * various router may notify pMTU in multicast, which can be
1616 * a DDoS to a router
1617 */
1618 if (V_ip6_mcast_pmtu)
1619 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1620 else {
1621 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1622 "g %s size %d (discarded)", if_name(ifp),
1623 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1624 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1625 mb_copy->m_pkthdr.len);
1626 m_freem(mb_copy); /* simply discard the packet */
1627 }
1628 }
1629 }
1630
1631 static int
1632 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1633 {
1634 #ifdef MRT6DEBUG
1635 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1636 #endif
1637 struct mbuf *mm;
1638 int i, len = m->m_pkthdr.len;
1639 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1640 struct mrt6msg *im6;
1641
1642 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1643 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1644 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1645 PIM6STAT_INC(pim6s_snd_registers);
1646
1647 /* Make a copy of the packet to send to the user level process. */
1648 mm = m_gethdr(M_NOWAIT, MT_DATA);
1649 if (mm == NULL)
1650 return (ENOBUFS);
1651 mm->m_data += max_linkhdr;
1652 mm->m_len = sizeof(struct ip6_hdr);
1653
1654 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1655 m_freem(mm);
1656 return (ENOBUFS);
1657 }
1658 i = MHLEN - M_LEADINGSPACE(mm);
1659 if (i > len)
1660 i = len;
1661 mm = m_pullup(mm, i);
1662 if (mm == NULL)
1663 return (ENOBUFS);
1664 /* TODO: check it! */
1665 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1666
1667 /*
1668 * Send message to routing daemon
1669 */
1670 sin6.sin6_addr = ip6->ip6_src;
1671
1672 im6 = mtod(mm, struct mrt6msg *);
1673 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1674 im6->im6_mbz = 0;
1675
1676 im6->im6_mif = mif - mif6table;
1677
1678 /* iif info is not given for reg. encap.n */
1679 MRT6STAT_INC(mrt6s_upcalls);
1680
1681 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1682 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1683 MRT6STAT_INC(mrt6s_upq_sockfull);
1684 return (ENOBUFS);
1685 }
1686 return (0);
1687 }
1688
1689 /*
1690 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1691 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1692 * into the kernel.
1693 */
1694 static int
1695 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
1696 {
1697
1698 #ifdef DIAGNOSTIC
1699 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1700 #endif
1701 if (proto != IPPROTO_PIM)
1702 return 0; /* not for us; reject the datagram. */
1703
1704 return 64; /* claim the datagram. */
1705 }
1706
1707 /*
1708 * PIM sparse mode hook
1709 * Receives the pim control messages, and passes them up to the listening
1710 * socket, using rip6_input.
1711 * The only message processed is the REGISTER pim message; the pim header
1712 * is stripped off, and the inner packet is passed to register_mforward.
1713 */
1714 int
1715 pim6_input(struct mbuf **mp, int *offp, int proto)
1716 {
1717 struct pim *pim; /* pointer to a pim struct */
1718 struct ip6_hdr *ip6;
1719 int pimlen;
1720 struct mbuf *m = *mp;
1721 int minlen;
1722 int off = *offp;
1723
1724 PIM6STAT_INC(pim6s_rcv_total);
1725
1726 ip6 = mtod(m, struct ip6_hdr *);
1727 pimlen = m->m_pkthdr.len - *offp;
1728
1729 /*
1730 * Validate lengths
1731 */
1732 if (pimlen < PIM_MINLEN) {
1733 PIM6STAT_INC(pim6s_rcv_tooshort);
1734 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1735 m_freem(m);
1736 return (IPPROTO_DONE);
1737 }
1738
1739 /*
1740 * if the packet is at least as big as a REGISTER, go ahead
1741 * and grab the PIM REGISTER header size, to avoid another
1742 * possible m_pullup() later.
1743 *
1744 * PIM_MINLEN == pimhdr + u_int32 == 8
1745 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1746 */
1747 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1748
1749 /*
1750 * Make sure that the IP6 and PIM headers in contiguous memory, and
1751 * possibly the PIM REGISTER header
1752 */
1753 #ifndef PULLDOWN_TEST
1754 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1755 /* adjust pointer */
1756 ip6 = mtod(m, struct ip6_hdr *);
1757
1758 /* adjust mbuf to point to the PIM header */
1759 pim = (struct pim *)((caddr_t)ip6 + off);
1760 #else
1761 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1762 if (pim == NULL) {
1763 PIM6STAT_INC(pim6s_rcv_tooshort);
1764 return (IPPROTO_DONE);
1765 }
1766 #endif
1767
1768 #define PIM6_CHECKSUM
1769 #ifdef PIM6_CHECKSUM
1770 {
1771 int cksumlen;
1772
1773 /*
1774 * Validate checksum.
1775 * If PIM REGISTER, exclude the data packet
1776 */
1777 if (pim->pim_type == PIM_REGISTER)
1778 cksumlen = PIM_MINLEN;
1779 else
1780 cksumlen = pimlen;
1781
1782 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1783 PIM6STAT_INC(pim6s_rcv_badsum);
1784 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1785 m_freem(m);
1786 return (IPPROTO_DONE);
1787 }
1788 }
1789 #endif /* PIM_CHECKSUM */
1790
1791 /* PIM version check */
1792 if (pim->pim_ver != PIM_VERSION) {
1793 PIM6STAT_INC(pim6s_rcv_badversion);
1794 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1795 "incorrect version %d, expecting %d",
1796 pim->pim_ver, PIM_VERSION);
1797 m_freem(m);
1798 return (IPPROTO_DONE);
1799 }
1800
1801 if (pim->pim_type == PIM_REGISTER) {
1802 /*
1803 * since this is a REGISTER, we'll make a copy of the register
1804 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1805 * routing daemon.
1806 */
1807 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1808
1809 struct mbuf *mcp;
1810 struct ip6_hdr *eip6;
1811 u_int32_t *reghdr;
1812 int rc;
1813 #ifdef MRT6DEBUG
1814 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1815 #endif
1816
1817 PIM6STAT_INC(pim6s_rcv_registers);
1818
1819 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1820 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1821 reg_mif_num);
1822 m_freem(m);
1823 return (IPPROTO_DONE);
1824 }
1825
1826 reghdr = (u_int32_t *)(pim + 1);
1827
1828 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1829 goto pim6_input_to_daemon;
1830
1831 /*
1832 * Validate length
1833 */
1834 if (pimlen < PIM6_REG_MINLEN) {
1835 PIM6STAT_INC(pim6s_rcv_tooshort);
1836 PIM6STAT_INC(pim6s_rcv_badregisters);
1837 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1838 "size too small %d from %s",
1839 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1840 m_freem(m);
1841 return (IPPROTO_DONE);
1842 }
1843
1844 eip6 = (struct ip6_hdr *) (reghdr + 1);
1845 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1846 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1847 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1848 ntohs(eip6->ip6_plen));
1849
1850 /* verify the version number of the inner packet */
1851 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1852 PIM6STAT_INC(pim6s_rcv_badregisters);
1853 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1854 "of the inner packet",
1855 (eip6->ip6_vfc & IPV6_VERSION));
1856 m_freem(m);
1857 return (IPPROTO_NONE);
1858 }
1859
1860 /* verify the inner packet is destined to a mcast group */
1861 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1862 PIM6STAT_INC(pim6s_rcv_badregisters);
1863 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1864 "is not multicast %s",
1865 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1866 m_freem(m);
1867 return (IPPROTO_DONE);
1868 }
1869
1870 /*
1871 * make a copy of the whole header to pass to the daemon later.
1872 */
1873 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1874 if (mcp == NULL) {
1875 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1876 "could not copy register head");
1877 m_freem(m);
1878 return (IPPROTO_DONE);
1879 }
1880
1881 /*
1882 * forward the inner ip6 packet; point m_data at the inner ip6.
1883 */
1884 m_adj(m, off + PIM_MINLEN);
1885 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1886 "src %s, dst %s, mif %d",
1887 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1888 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1889
1890 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1891 dst.sin6_family, 0);
1892
1893 /* prepare the register head to send to the mrouting daemon */
1894 m = mcp;
1895 }
1896
1897 /*
1898 * Pass the PIM message up to the daemon; if it is a register message
1899 * pass the 'head' only up to the daemon. This includes the
1900 * encapsulator ip6 header, pim header, register header and the
1901 * encapsulated ip6 header.
1902 */
1903 pim6_input_to_daemon:
1904 rip6_input(&m, offp, proto);
1905 return (IPPROTO_DONE);
1906 }
1907
1908 static int
1909 ip6_mroute_modevent(module_t mod, int type, void *unused)
1910 {
1911
1912 switch (type) {
1913 case MOD_LOAD:
1914 MROUTER6_LOCK_INIT();
1915 MFC6_LOCK_INIT();
1916 MIF6_LOCK_INIT();
1917
1918 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
1919 pim6_encapcheck,
1920 (const struct protosw *)&in6_pim_protosw, NULL);
1921 if (pim6_encap_cookie == NULL) {
1922 printf("ip6_mroute: unable to attach pim6 encap\n");
1923 MIF6_LOCK_DESTROY();
1924 MFC6_LOCK_DESTROY();
1925 MROUTER6_LOCK_DESTROY();
1926 return (EINVAL);
1927 }
1928
1929 ip6_mforward = X_ip6_mforward;
1930 ip6_mrouter_done = X_ip6_mrouter_done;
1931 ip6_mrouter_get = X_ip6_mrouter_get;
1932 ip6_mrouter_set = X_ip6_mrouter_set;
1933 mrt6_ioctl = X_mrt6_ioctl;
1934 break;
1935
1936 case MOD_UNLOAD:
1937 if (V_ip6_mrouter != NULL)
1938 return EINVAL;
1939
1940 if (pim6_encap_cookie) {
1941 encap_detach(pim6_encap_cookie);
1942 pim6_encap_cookie = NULL;
1943 }
1944 X_ip6_mrouter_done();
1945 ip6_mforward = NULL;
1946 ip6_mrouter_done = NULL;
1947 ip6_mrouter_get = NULL;
1948 ip6_mrouter_set = NULL;
1949 mrt6_ioctl = NULL;
1950
1951 MIF6_LOCK_DESTROY();
1952 MFC6_LOCK_DESTROY();
1953 MROUTER6_LOCK_DESTROY();
1954 break;
1955
1956 default:
1957 return (EOPNOTSUPP);
1958 }
1959
1960 return (0);
1961 }
1962
1963 static moduledata_t ip6_mroutemod = {
1964 "ip6_mroute",
1965 ip6_mroute_modevent,
1966 0
1967 };
1968
1969 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);
Cache object: 306f0913228ce88dea3335030bdf9ce3
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