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 * 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 #include "opt_inet6.h"
83
84 #include <sys/param.h>
85 #include <sys/callout.h>
86 #include <sys/errno.h>
87 #include <sys/kernel.h>
88 #include <sys/lock.h>
89 #include <sys/malloc.h>
90 #include <sys/mbuf.h>
91 #include <sys/module.h>
92 #include <sys/domain.h>
93 #include <sys/protosw.h>
94 #include <sys/sdt.h>
95 #include <sys/signalvar.h>
96 #include <sys/socket.h>
97 #include <sys/socketvar.h>
98 #include <sys/sockio.h>
99 #include <sys/sx.h>
100 #include <sys/sysctl.h>
101 #include <sys/syslog.h>
102 #include <sys/systm.h>
103 #include <sys/time.h>
104
105 #include <net/if.h>
106 #include <net/if_var.h>
107 #include <net/if_private.h>
108 #include <net/if_types.h>
109 #include <net/vnet.h>
110
111 #include <netinet/in.h>
112 #include <netinet/in_var.h>
113 #include <netinet/icmp6.h>
114 #include <netinet/ip_encap.h>
115
116 #include <netinet/ip6.h>
117 #include <netinet/in_kdtrace.h>
118 #include <netinet6/ip6_var.h>
119 #include <netinet6/scope6_var.h>
120 #include <netinet6/nd6.h>
121 #include <netinet6/ip6_mroute.h>
122 #include <netinet6/pim6.h>
123 #include <netinet6/pim6_var.h>
124
125 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
126
127 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
128 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
129 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
130 static int set_pim6(int *);
131 static int socket_send(struct socket *, struct mbuf *,
132 struct sockaddr_in6 *);
133
134 extern int in6_mcast_loop;
135 extern struct domain inet6domain;
136
137 static const struct encaptab *pim6_encap_cookie;
138 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
139 static int pim6_input(struct mbuf *, int, int, void *);
140
141 static const struct encap_config ipv6_encap_cfg = {
142 .proto = IPPROTO_PIM,
143 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN,
144 .exact_match = 8,
145 .check = pim6_encapcheck,
146 .input = pim6_input
147 };
148
149 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
150 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
151
152 SYSCTL_DECL(_net_inet6);
153 SYSCTL_DECL(_net_inet6_ip6);
154 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
155 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
156 "PIM");
157
158 static struct mrt6stat mrt6stat;
159 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
160 &mrt6stat, mrt6stat,
161 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
162
163 #define MRT6STAT_INC(name) mrt6stat.name += 1
164 #define NO_RTE_FOUND 0x1
165 #define RTE_FOUND 0x2
166
167 static struct sx mrouter6_mtx;
168 #define MROUTER6_LOCKPTR() (&mrouter6_mtx)
169 #define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR())
170 #define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR())
171 #define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED
172 #define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6")
173 #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR())
174
175 static struct mf6c *mf6ctable[MF6CTBLSIZ];
176 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
177 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
178 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
179 "netinet6/ip6_mroute.h)");
180
181 static struct mtx mfc6_mtx;
182 #define MFC6_LOCKPTR() (&mfc6_mtx)
183 #define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR())
184 #define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR())
185 #define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED)
186 #define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \
187 "IPv6 multicast forwarding cache", \
188 NULL, MTX_DEF)
189 #define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR())
190
191 static u_char n6expire[MF6CTBLSIZ];
192
193 static struct mif6 mif6table[MAXMIFS];
194 static int
sysctl_mif6table(SYSCTL_HANDLER_ARGS)195 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
196 {
197 struct mif6_sctl *out;
198 int error;
199
200 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
201 M_WAITOK | M_ZERO);
202 for (int i = 0; i < MAXMIFS; i++) {
203 out[i].m6_flags = mif6table[i].m6_flags;
204 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
205 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
206 if (mif6table[i].m6_ifp != NULL)
207 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
208 else
209 out[i].m6_ifp = 0;
210 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
211 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
212 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
213 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
214 }
215 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
216 free(out, M_TEMP);
217 return (error);
218 }
219 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
220 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
221 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
222 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
223 "netinet6/ip6_mroute.h)");
224
225 static struct mtx mif6_mtx;
226 #define MIF6_LOCKPTR() (&mif6_mtx)
227 #define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR())
228 #define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR())
229 #define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED)
230 #define MIF6_LOCK_INIT() \
231 mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF)
232 #define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR())
233
234 #ifdef MRT6DEBUG
235 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
236 #define V_mrt6debug VNET(mrt6debug)
237 #define DEBUG_MFC 0x02
238 #define DEBUG_FORWARD 0x04
239 #define DEBUG_EXPIRE 0x08
240 #define DEBUG_XMIT 0x10
241 #define DEBUG_REG 0x20
242 #define DEBUG_PIM 0x40
243 #define DEBUG_ERR 0x80
244 #define DEBUG_ANY 0x7f
245 #define MRT6_DLOG(m, fmt, ...) \
246 if (V_mrt6debug & (m)) \
247 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
248 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
249 #else
250 #define MRT6_DLOG(m, fmt, ...)
251 #endif
252
253 static void expire_upcalls(void *);
254 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
255 #define UPCALL_EXPIRE 6 /* number of timeouts */
256
257 /*
258 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
259 */
260
261 /*
262 * 'Interfaces' associated with decapsulator (so we can tell
263 * packets that went through it from ones that get reflected
264 * by a broken gateway). Different from IPv4 register_if,
265 * these interfaces are linked into the system ifnet list,
266 * because per-interface IPv6 statistics are maintained in
267 * ifp->if_afdata. But it does not have any routes point
268 * to them. I.e., packets can't be sent this way. They
269 * only exist as a placeholder for multicast source
270 * verification.
271 */
272 static struct ifnet *multicast_register_if6;
273
274 #define ENCAP_HOPS 64
275
276 /*
277 * Private variables.
278 */
279 static mifi_t nummifs = 0;
280 static mifi_t reg_mif_num = (mifi_t)-1;
281
282 static struct pim6stat pim6stat;
283 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
284 &pim6stat, pim6stat,
285 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
286
287 #define PIM6STAT_INC(name) pim6stat.name += 1
288 VNET_DEFINE_STATIC(int, pim6);
289 #define V_pim6 VNET(pim6)
290
291 /*
292 * Hash function for a source, group entry
293 */
294 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
295 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
296 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
297 (g).s6_addr32[2] ^ (g).s6_addr32[3])
298
299 /*
300 * Find a route for a given origin IPv6 address and Multicast group address.
301 */
302 #define MF6CFIND(o, g, rt) do { \
303 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
304 rt = NULL; \
305 while (_rt) { \
306 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
307 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
308 (_rt->mf6c_stall == NULL)) { \
309 rt = _rt; \
310 break; \
311 } \
312 _rt = _rt->mf6c_next; \
313 } \
314 if (rt == NULL) { \
315 MRT6STAT_INC(mrt6s_mfc_misses); \
316 } \
317 } while (/*CONSTCOND*/ 0)
318
319 /*
320 * Macros to compute elapsed time efficiently
321 * Borrowed from Van Jacobson's scheduling code
322 * XXX: replace with timersub() ?
323 */
324 #define TV_DELTA(a, b, delta) do { \
325 int xxs; \
326 \
327 delta = (a).tv_usec - (b).tv_usec; \
328 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
329 switch (xxs) { \
330 case 2: \
331 delta += 1000000; \
332 /* FALLTHROUGH */ \
333 case 1: \
334 delta += 1000000; \
335 break; \
336 default: \
337 delta += (1000000 * xxs); \
338 } \
339 } \
340 } while (/*CONSTCOND*/ 0)
341
342 /* XXX: replace with timercmp(a, b, <) ? */
343 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
344 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
345
346 #ifdef UPCALL_TIMING
347 #define UPCALL_MAX 50
348 static u_long upcall_data[UPCALL_MAX + 1];
349 static void collate();
350 #endif /* UPCALL_TIMING */
351
352 static int ip6_mrouter_init(struct socket *, int, int);
353 static int add_m6fc(struct mf6cctl *);
354 static int add_m6if(struct mif6ctl *);
355 static int del_m6fc(struct mf6cctl *);
356 static int del_m6if(mifi_t *);
357 static int del_m6if_locked(mifi_t *);
358 static int get_mif6_cnt(struct sioc_mif_req6 *);
359 static int get_sg_cnt(struct sioc_sg_req6 *);
360
361 static struct callout expire_upcalls_ch;
362
363 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
364 int X_ip6_mrouter_done(void);
365 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
366 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
367 int X_mrt6_ioctl(u_long, caddr_t);
368
369 /*
370 * Handle MRT setsockopt commands to modify the multicast routing tables.
371 */
372 int
X_ip6_mrouter_set(struct socket * so,struct sockopt * sopt)373 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
374 {
375 int error = 0;
376 int optval;
377 struct mif6ctl mifc;
378 struct mf6cctl mfcc;
379 mifi_t mifi;
380
381 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
382 return (EPERM);
383
384 switch (sopt->sopt_name) {
385 case MRT6_INIT:
386 #ifdef MRT6_OINIT
387 case MRT6_OINIT:
388 #endif
389 error = sooptcopyin(sopt, &optval, sizeof(optval),
390 sizeof(optval));
391 if (error)
392 break;
393 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
394 break;
395 case MRT6_DONE:
396 error = X_ip6_mrouter_done();
397 break;
398 case MRT6_ADD_MIF:
399 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
400 if (error)
401 break;
402 error = add_m6if(&mifc);
403 break;
404 case MRT6_ADD_MFC:
405 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
406 if (error)
407 break;
408 error = add_m6fc(&mfcc);
409 break;
410 case MRT6_DEL_MFC:
411 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
412 if (error)
413 break;
414 error = del_m6fc(&mfcc);
415 break;
416 case MRT6_DEL_MIF:
417 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
418 if (error)
419 break;
420 error = del_m6if(&mifi);
421 break;
422 case MRT6_PIM:
423 error = sooptcopyin(sopt, &optval, sizeof(optval),
424 sizeof(optval));
425 if (error)
426 break;
427 error = set_pim6(&optval);
428 break;
429 default:
430 error = EOPNOTSUPP;
431 break;
432 }
433
434 return (error);
435 }
436
437 /*
438 * Handle MRT getsockopt commands
439 */
440 int
X_ip6_mrouter_get(struct socket * so,struct sockopt * sopt)441 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
442 {
443 int error = 0;
444
445 if (so != V_ip6_mrouter)
446 return (EACCES);
447
448 switch (sopt->sopt_name) {
449 case MRT6_PIM:
450 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
451 break;
452 }
453 return (error);
454 }
455
456 /*
457 * Handle ioctl commands to obtain information from the cache
458 */
459 int
X_mrt6_ioctl(u_long cmd,caddr_t data)460 X_mrt6_ioctl(u_long cmd, caddr_t data)
461 {
462 int ret;
463
464 ret = EINVAL;
465
466 switch (cmd) {
467 case SIOCGETSGCNT_IN6:
468 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
469 break;
470
471 case SIOCGETMIFCNT_IN6:
472 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
473 break;
474
475 default:
476 break;
477 }
478
479 return (ret);
480 }
481
482 /*
483 * returns the packet, byte, rpf-failure count for the source group provided
484 */
485 static int
get_sg_cnt(struct sioc_sg_req6 * req)486 get_sg_cnt(struct sioc_sg_req6 *req)
487 {
488 struct mf6c *rt;
489 int ret;
490
491 ret = 0;
492
493 MFC6_LOCK();
494
495 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
496 if (rt == NULL) {
497 ret = ESRCH;
498 } else {
499 req->pktcnt = rt->mf6c_pkt_cnt;
500 req->bytecnt = rt->mf6c_byte_cnt;
501 req->wrong_if = rt->mf6c_wrong_if;
502 }
503
504 MFC6_UNLOCK();
505
506 return (ret);
507 }
508
509 /*
510 * returns the input and output packet and byte counts on the mif provided
511 */
512 static int
get_mif6_cnt(struct sioc_mif_req6 * req)513 get_mif6_cnt(struct sioc_mif_req6 *req)
514 {
515 mifi_t mifi;
516 int ret;
517
518 ret = 0;
519 mifi = req->mifi;
520
521 MIF6_LOCK();
522
523 if (mifi >= nummifs) {
524 ret = EINVAL;
525 } else {
526 req->icount = mif6table[mifi].m6_pkt_in;
527 req->ocount = mif6table[mifi].m6_pkt_out;
528 req->ibytes = mif6table[mifi].m6_bytes_in;
529 req->obytes = mif6table[mifi].m6_bytes_out;
530 }
531
532 MIF6_UNLOCK();
533
534 return (ret);
535 }
536
537 static int
set_pim6(int * i)538 set_pim6(int *i)
539 {
540 if ((*i != 1) && (*i != 0))
541 return (EINVAL);
542
543 V_pim6 = *i;
544
545 return (0);
546 }
547
548 /*
549 * Enable multicast routing
550 */
551 static int
ip6_mrouter_init(struct socket * so,int v,int cmd)552 ip6_mrouter_init(struct socket *so, int v, int cmd)
553 {
554
555 MRT6_DLOG(DEBUG_ANY, "%s: socket %p", __func__, so);
556
557 if (v != 1)
558 return (ENOPROTOOPT);
559
560 MROUTER6_LOCK();
561
562 if (V_ip6_mrouter != NULL) {
563 MROUTER6_UNLOCK();
564 return (EADDRINUSE);
565 }
566
567 V_ip6_mrouter = so;
568 V_ip6_mrouter_ver = cmd;
569
570 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
571 bzero((caddr_t)n6expire, sizeof(n6expire));
572
573 V_pim6 = 0;/* used for stubbing out/in pim stuff */
574
575 callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0);
576 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
577 expire_upcalls, NULL);
578
579 MROUTER6_UNLOCK();
580
581 MRT6_DLOG(DEBUG_ANY, "finished");
582
583 return (0);
584 }
585
586 /*
587 * Disable IPv6 multicast forwarding.
588 */
589 int
X_ip6_mrouter_done(void)590 X_ip6_mrouter_done(void)
591 {
592 mifi_t mifi;
593 u_long i;
594 struct mf6c *rt;
595 struct rtdetq *rte;
596
597 MROUTER6_LOCK();
598
599 if (V_ip6_mrouter == NULL) {
600 MROUTER6_UNLOCK();
601 return (EINVAL);
602 }
603
604 /*
605 * For each phyint in use, disable promiscuous reception of all IPv6
606 * multicasts.
607 */
608 for (mifi = 0; mifi < nummifs; mifi++) {
609 if (mif6table[mifi].m6_ifp &&
610 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
611 if_allmulti(mif6table[mifi].m6_ifp, 0);
612 }
613 }
614 bzero((caddr_t)mif6table, sizeof(mif6table));
615 nummifs = 0;
616
617 V_pim6 = 0; /* used to stub out/in pim specific code */
618
619 /*
620 * Free all multicast forwarding cache entries.
621 */
622 MFC6_LOCK();
623 for (i = 0; i < MF6CTBLSIZ; i++) {
624 rt = mf6ctable[i];
625 while (rt) {
626 struct mf6c *frt;
627
628 for (rte = rt->mf6c_stall; rte != NULL; ) {
629 struct rtdetq *n = rte->next;
630
631 m_freem(rte->m);
632 free(rte, M_MRTABLE6);
633 rte = n;
634 }
635 frt = rt;
636 rt = rt->mf6c_next;
637 free(frt, M_MRTABLE6);
638 }
639 }
640 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
641 MFC6_UNLOCK();
642
643 callout_drain(&expire_upcalls_ch);
644
645 /*
646 * Reset register interface
647 */
648 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
649 if_detach(multicast_register_if6);
650 if_free(multicast_register_if6);
651 reg_mif_num = (mifi_t)-1;
652 multicast_register_if6 = NULL;
653 }
654
655 V_ip6_mrouter = NULL;
656 V_ip6_mrouter_ver = 0;
657
658 MROUTER6_UNLOCK();
659 MRT6_DLOG(DEBUG_ANY, "finished");
660
661 return (0);
662 }
663
664 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
665
666 /*
667 * Add a mif to the mif table
668 */
669 static int
add_m6if(struct mif6ctl * mifcp)670 add_m6if(struct mif6ctl *mifcp)
671 {
672 struct epoch_tracker et;
673 struct mif6 *mifp;
674 struct ifnet *ifp;
675 int error;
676
677 MIF6_LOCK();
678
679 if (mifcp->mif6c_mifi >= MAXMIFS) {
680 MIF6_UNLOCK();
681 return (EINVAL);
682 }
683 mifp = mif6table + mifcp->mif6c_mifi;
684 if (mifp->m6_ifp != NULL) {
685 MIF6_UNLOCK();
686 return (EADDRINUSE); /* XXX: is it appropriate? */
687 }
688
689 NET_EPOCH_ENTER(et);
690 if ((ifp = ifnet_byindex(mifcp->mif6c_pifi)) == NULL) {
691 NET_EPOCH_EXIT(et);
692 MIF6_UNLOCK();
693 return (ENXIO);
694 }
695 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */
696
697 if (mifcp->mif6c_flags & MIFF_REGISTER) {
698 if (reg_mif_num == (mifi_t)-1) {
699 ifp = if_alloc(IFT_OTHER);
700
701 if_initname(ifp, "register_mif", 0);
702 ifp->if_flags |= IFF_LOOPBACK;
703 if_attach(ifp);
704 multicast_register_if6 = ifp;
705 reg_mif_num = mifcp->mif6c_mifi;
706 /*
707 * it is impossible to guess the ifindex of the
708 * register interface. So mif6c_pifi is automatically
709 * calculated.
710 */
711 mifcp->mif6c_pifi = ifp->if_index;
712 } else {
713 ifp = multicast_register_if6;
714 }
715 } else {
716 /* Make sure the interface supports multicast */
717 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
718 MIF6_UNLOCK();
719 return (EOPNOTSUPP);
720 }
721
722 error = if_allmulti(ifp, 1);
723 if (error) {
724 MIF6_UNLOCK();
725 return (error);
726 }
727 }
728
729 mifp->m6_flags = mifcp->mif6c_flags;
730 mifp->m6_ifp = ifp;
731
732 /* initialize per mif pkt counters */
733 mifp->m6_pkt_in = 0;
734 mifp->m6_pkt_out = 0;
735 mifp->m6_bytes_in = 0;
736 mifp->m6_bytes_out = 0;
737
738 /* Adjust nummifs up if the mifi is higher than nummifs */
739 if (nummifs <= mifcp->mif6c_mifi)
740 nummifs = mifcp->mif6c_mifi + 1;
741
742 MIF6_UNLOCK();
743 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
744 if_name(ifp));
745
746 return (0);
747 }
748
749 /*
750 * Delete a mif from the mif table
751 */
752 static int
del_m6if_locked(mifi_t * mifip)753 del_m6if_locked(mifi_t *mifip)
754 {
755 struct mif6 *mifp = mif6table + *mifip;
756 mifi_t mifi;
757 struct ifnet *ifp;
758
759 MIF6_LOCK_ASSERT();
760
761 if (*mifip >= nummifs)
762 return (EINVAL);
763 if (mifp->m6_ifp == NULL)
764 return (EINVAL);
765
766 if (!(mifp->m6_flags & MIFF_REGISTER)) {
767 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
768 ifp = mifp->m6_ifp;
769 if_allmulti(ifp, 0);
770 } else {
771 if (reg_mif_num != (mifi_t)-1 &&
772 multicast_register_if6 != NULL) {
773 if_detach(multicast_register_if6);
774 if_free(multicast_register_if6);
775 reg_mif_num = (mifi_t)-1;
776 multicast_register_if6 = NULL;
777 }
778 }
779
780 bzero((caddr_t)mifp, sizeof(*mifp));
781
782 /* Adjust nummifs down */
783 for (mifi = nummifs; mifi > 0; mifi--)
784 if (mif6table[mifi - 1].m6_ifp)
785 break;
786 nummifs = mifi;
787 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
788
789 return (0);
790 }
791
792 static int
del_m6if(mifi_t * mifip)793 del_m6if(mifi_t *mifip)
794 {
795 int cc;
796
797 MIF6_LOCK();
798 cc = del_m6if_locked(mifip);
799 MIF6_UNLOCK();
800
801 return (cc);
802 }
803
804 /*
805 * Add an mfc entry
806 */
807 static int
add_m6fc(struct mf6cctl * mfccp)808 add_m6fc(struct mf6cctl *mfccp)
809 {
810 struct mf6c *rt;
811 u_long hash;
812 struct rtdetq *rte;
813 u_short nstl;
814 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
815
816 MFC6_LOCK();
817
818 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
819 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
820
821 /* If an entry already exists, just update the fields */
822 if (rt) {
823 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
824 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
825 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
826 mfccp->mf6cc_parent);
827
828 rt->mf6c_parent = mfccp->mf6cc_parent;
829 rt->mf6c_ifset = mfccp->mf6cc_ifset;
830
831 MFC6_UNLOCK();
832 return (0);
833 }
834
835 /*
836 * Find the entry for which the upcall was made and update
837 */
838 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
839 mfccp->mf6cc_mcastgrp.sin6_addr);
840 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
841 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
842 &mfccp->mf6cc_origin.sin6_addr) &&
843 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
844 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
845 (rt->mf6c_stall != NULL)) {
846 if (nstl++)
847 log(LOG_ERR,
848 "add_m6fc: %s o %s g %s p %x dbx %p\n",
849 "multiple kernel entries",
850 ip6_sprintf(ip6bufo,
851 &mfccp->mf6cc_origin.sin6_addr),
852 ip6_sprintf(ip6bufg,
853 &mfccp->mf6cc_mcastgrp.sin6_addr),
854 mfccp->mf6cc_parent, rt->mf6c_stall);
855
856 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
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 rt->mf6c_origin = mfccp->mf6cc_origin;
864 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
865 rt->mf6c_parent = mfccp->mf6cc_parent;
866 rt->mf6c_ifset = mfccp->mf6cc_ifset;
867 /* initialize pkt counters per src-grp */
868 rt->mf6c_pkt_cnt = 0;
869 rt->mf6c_byte_cnt = 0;
870 rt->mf6c_wrong_if = 0;
871
872 rt->mf6c_expire = 0; /* Don't clean this guy up */
873 n6expire[hash]--;
874
875 /* free packets Qed at the end of this entry */
876 for (rte = rt->mf6c_stall; rte != NULL; ) {
877 struct rtdetq *n = rte->next;
878 ip6_mdq(rte->m, rte->ifp, rt);
879 m_freem(rte->m);
880 #ifdef UPCALL_TIMING
881 collate(&(rte->t));
882 #endif /* UPCALL_TIMING */
883 free(rte, M_MRTABLE6);
884 rte = n;
885 }
886 rt->mf6c_stall = NULL;
887 }
888 }
889
890 /*
891 * It is possible that an entry is being inserted without an upcall
892 */
893 if (nstl == 0) {
894 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
895 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
896 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
897 mfccp->mf6cc_parent);
898
899 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
900 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
901 &mfccp->mf6cc_origin.sin6_addr)&&
902 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
903 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
904 rt->mf6c_origin = mfccp->mf6cc_origin;
905 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
906 rt->mf6c_parent = mfccp->mf6cc_parent;
907 rt->mf6c_ifset = mfccp->mf6cc_ifset;
908 /* initialize pkt counters per src-grp */
909 rt->mf6c_pkt_cnt = 0;
910 rt->mf6c_byte_cnt = 0;
911 rt->mf6c_wrong_if = 0;
912
913 if (rt->mf6c_expire)
914 n6expire[hash]--;
915 rt->mf6c_expire = 0;
916 }
917 }
918 if (rt == NULL) {
919 /* no upcall, so make a new entry */
920 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
921 M_NOWAIT);
922 if (rt == NULL) {
923 MFC6_UNLOCK();
924 return (ENOBUFS);
925 }
926
927 /* insert new entry at head of hash chain */
928 rt->mf6c_origin = mfccp->mf6cc_origin;
929 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
930 rt->mf6c_parent = mfccp->mf6cc_parent;
931 rt->mf6c_ifset = mfccp->mf6cc_ifset;
932 /* initialize pkt counters per src-grp */
933 rt->mf6c_pkt_cnt = 0;
934 rt->mf6c_byte_cnt = 0;
935 rt->mf6c_wrong_if = 0;
936 rt->mf6c_expire = 0;
937 rt->mf6c_stall = NULL;
938
939 /* link into table */
940 rt->mf6c_next = mf6ctable[hash];
941 mf6ctable[hash] = rt;
942 }
943 }
944
945 MFC6_UNLOCK();
946 return (0);
947 }
948
949 #ifdef UPCALL_TIMING
950 /*
951 * collect delay statistics on the upcalls
952 */
953 static void
collate(struct timeval * t)954 collate(struct timeval *t)
955 {
956 u_long d;
957 struct timeval tp;
958 u_long delta;
959
960 GET_TIME(tp);
961
962 if (TV_LT(*t, tp))
963 {
964 TV_DELTA(tp, *t, delta);
965
966 d = delta >> 10;
967 if (d > UPCALL_MAX)
968 d = UPCALL_MAX;
969
970 ++upcall_data[d];
971 }
972 }
973 #endif /* UPCALL_TIMING */
974
975 /*
976 * Delete an mfc entry
977 */
978 static int
del_m6fc(struct mf6cctl * mfccp)979 del_m6fc(struct mf6cctl *mfccp)
980 {
981 #ifdef MRT6DEBUG
982 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
983 #endif
984 struct sockaddr_in6 origin;
985 struct sockaddr_in6 mcastgrp;
986 struct mf6c *rt;
987 struct mf6c **nptr;
988 u_long hash;
989
990 origin = mfccp->mf6cc_origin;
991 mcastgrp = mfccp->mf6cc_mcastgrp;
992 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
993
994 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
995 ip6_sprintf(ip6bufo, &origin.sin6_addr),
996 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
997
998 MFC6_LOCK();
999
1000 nptr = &mf6ctable[hash];
1001 while ((rt = *nptr) != NULL) {
1002 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1003 &rt->mf6c_origin.sin6_addr) &&
1004 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1005 &rt->mf6c_mcastgrp.sin6_addr) &&
1006 rt->mf6c_stall == NULL)
1007 break;
1008
1009 nptr = &rt->mf6c_next;
1010 }
1011 if (rt == NULL) {
1012 MFC6_UNLOCK();
1013 return (EADDRNOTAVAIL);
1014 }
1015
1016 *nptr = rt->mf6c_next;
1017 free(rt, M_MRTABLE6);
1018
1019 MFC6_UNLOCK();
1020
1021 return (0);
1022 }
1023
1024 static int
socket_send(struct socket * s,struct mbuf * mm,struct sockaddr_in6 * src)1025 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1026 {
1027
1028 if (s) {
1029 if (sbappendaddr(&s->so_rcv,
1030 (struct sockaddr *)src,
1031 mm, (struct mbuf *)0) != 0) {
1032 sorwakeup(s);
1033 return (0);
1034 } else
1035 soroverflow(s);
1036 }
1037 m_freem(mm);
1038 return (-1);
1039 }
1040
1041 /*
1042 * IPv6 multicast forwarding function. This function assumes that the packet
1043 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1044 * pointed to by "ifp", and the packet is to be relayed to other networks
1045 * that have members of the packet's destination IPv6 multicast group.
1046 *
1047 * The packet is returned unscathed to the caller, unless it is
1048 * erroneous, in which case a non-zero return value tells the caller to
1049 * discard it.
1050 *
1051 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1052 * this function is called in the originating context (i.e., not when
1053 * forwarding a packet from other node). ip6_output(), which is currently the
1054 * only function that calls this function is called in the originating context,
1055 * explicitly ensures this condition. It is caller's responsibility to ensure
1056 * that if this function is called from somewhere else in the originating
1057 * context in the future.
1058 */
1059 int
X_ip6_mforward(struct ip6_hdr * ip6,struct ifnet * ifp,struct mbuf * m)1060 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1061 {
1062 struct rtdetq *rte;
1063 struct mbuf *mb0;
1064 struct mf6c *rt;
1065 struct mif6 *mifp;
1066 struct mbuf *mm;
1067 u_long hash;
1068 mifi_t mifi;
1069 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1070 #ifdef UPCALL_TIMING
1071 struct timeval tp;
1072
1073 GET_TIME(tp);
1074 #endif /* UPCALL_TIMING */
1075
1076 M_ASSERTMAPPED(m);
1077 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1078 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1079 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1080
1081 /*
1082 * Don't forward a packet with Hop limit of zero or one,
1083 * or a packet destined to a local-only group.
1084 */
1085 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1086 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1087 return (0);
1088 ip6->ip6_hlim--;
1089
1090 /*
1091 * Source address check: do not forward packets with unspecified
1092 * source. It was discussed in July 2000, on ipngwg mailing list.
1093 * This is rather more serious than unicast cases, because some
1094 * MLD packets can be sent with the unspecified source address
1095 * (although such packets must normally set 1 to the hop limit field).
1096 */
1097 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1098 IP6STAT_INC(ip6s_cantforward);
1099 if (V_ip6_log_cannot_forward && ip6_log_ratelimit()) {
1100 log(LOG_DEBUG,
1101 "cannot forward "
1102 "from %s to %s nxt %d received on %s\n",
1103 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1104 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1105 ip6->ip6_nxt,
1106 if_name(m->m_pkthdr.rcvif));
1107 }
1108 return (0);
1109 }
1110
1111 MFC6_LOCK();
1112
1113 /*
1114 * Determine forwarding mifs from the forwarding cache table
1115 */
1116 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1117 MRT6STAT_INC(mrt6s_mfc_lookups);
1118
1119 /* Entry exists, so forward if necessary */
1120 if (rt) {
1121 MFC6_UNLOCK();
1122 return (ip6_mdq(m, ifp, rt));
1123 }
1124
1125 /*
1126 * If we don't have a route for packet's origin,
1127 * Make a copy of the packet & send message to routing daemon.
1128 */
1129 MRT6STAT_INC(mrt6s_no_route);
1130 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1131 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1132 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1133
1134 /*
1135 * Allocate mbufs early so that we don't do extra work if we
1136 * are just going to fail anyway.
1137 */
1138 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1139 if (rte == NULL) {
1140 MFC6_UNLOCK();
1141 return (ENOBUFS);
1142 }
1143 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1144 /*
1145 * Pullup packet header if needed before storing it,
1146 * as other references may modify it in the meantime.
1147 */
1148 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1149 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1150 if (mb0 == NULL) {
1151 free(rte, M_MRTABLE6);
1152 MFC6_UNLOCK();
1153 return (ENOBUFS);
1154 }
1155
1156 /* is there an upcall waiting for this packet? */
1157 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1158 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1159 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1160 &rt->mf6c_origin.sin6_addr) &&
1161 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1162 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1163 break;
1164 }
1165
1166 if (rt == NULL) {
1167 struct mrt6msg *im;
1168 #ifdef MRT6_OINIT
1169 struct omrt6msg *oim;
1170 #endif
1171 /* no upcall, so make a new entry */
1172 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1173 if (rt == NULL) {
1174 free(rte, M_MRTABLE6);
1175 m_freem(mb0);
1176 MFC6_UNLOCK();
1177 return (ENOBUFS);
1178 }
1179 /*
1180 * Make a copy of the header to send to the user
1181 * level process
1182 */
1183 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
1184 if (mm == NULL) {
1185 free(rte, M_MRTABLE6);
1186 m_freem(mb0);
1187 free(rt, M_MRTABLE6);
1188 MFC6_UNLOCK();
1189 return (ENOBUFS);
1190 }
1191
1192 /*
1193 * Send message to routing daemon
1194 */
1195 sin6.sin6_addr = ip6->ip6_src;
1196 im = NULL;
1197 #ifdef MRT6_OINIT
1198 oim = NULL;
1199 #endif
1200 switch (V_ip6_mrouter_ver) {
1201 #ifdef MRT6_OINIT
1202 case MRT6_OINIT:
1203 oim = mtod(mm, struct omrt6msg *);
1204 oim->im6_msgtype = MRT6MSG_NOCACHE;
1205 oim->im6_mbz = 0;
1206 break;
1207 #endif
1208 case MRT6_INIT:
1209 im = mtod(mm, struct mrt6msg *);
1210 im->im6_msgtype = MRT6MSG_NOCACHE;
1211 im->im6_mbz = 0;
1212 break;
1213 default:
1214 free(rte, M_MRTABLE6);
1215 m_freem(mb0);
1216 free(rt, M_MRTABLE6);
1217 MFC6_UNLOCK();
1218 return (EINVAL);
1219 }
1220
1221 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1222 for (mifp = mif6table, mifi = 0;
1223 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1224 ;
1225
1226 switch (V_ip6_mrouter_ver) {
1227 #ifdef MRT6_OINIT
1228 case MRT6_OINIT:
1229 oim->im6_mif = mifi;
1230 break;
1231 #endif
1232 case MRT6_INIT:
1233 im->im6_mif = mifi;
1234 break;
1235 }
1236
1237 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1238 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1239 "socket queue full\n");
1240 MRT6STAT_INC(mrt6s_upq_sockfull);
1241 free(rte, M_MRTABLE6);
1242 m_freem(mb0);
1243 free(rt, M_MRTABLE6);
1244 MFC6_UNLOCK();
1245 return (ENOBUFS);
1246 }
1247
1248 MRT6STAT_INC(mrt6s_upcalls);
1249
1250 /* insert new entry at head of hash chain */
1251 bzero(rt, sizeof(*rt));
1252 rt->mf6c_origin.sin6_family = AF_INET6;
1253 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1254 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1255 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1256 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1257 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1258 rt->mf6c_expire = UPCALL_EXPIRE;
1259 n6expire[hash]++;
1260 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1261
1262 /* link into table */
1263 rt->mf6c_next = mf6ctable[hash];
1264 mf6ctable[hash] = rt;
1265 /* Add this entry to the end of the queue */
1266 rt->mf6c_stall = rte;
1267 } else {
1268 /* determine if q has overflowed */
1269 struct rtdetq **p;
1270 int npkts = 0;
1271
1272 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1273 if (++npkts > MAX_UPQ6) {
1274 MRT6STAT_INC(mrt6s_upq_ovflw);
1275 free(rte, M_MRTABLE6);
1276 m_freem(mb0);
1277 MFC6_UNLOCK();
1278 return (0);
1279 }
1280
1281 /* Add this entry to the end of the queue */
1282 *p = rte;
1283 }
1284
1285 rte->next = NULL;
1286 rte->m = mb0;
1287 rte->ifp = ifp;
1288 #ifdef UPCALL_TIMING
1289 rte->t = tp;
1290 #endif /* UPCALL_TIMING */
1291
1292 MFC6_UNLOCK();
1293
1294 return (0);
1295 }
1296
1297 /*
1298 * Clean up cache entries if upcalls are not serviced
1299 * Call from the Slow Timeout mechanism, every half second.
1300 */
1301 static void
expire_upcalls(void * unused)1302 expire_upcalls(void *unused)
1303 {
1304 #ifdef MRT6DEBUG
1305 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1306 #endif
1307 struct rtdetq *rte;
1308 struct mf6c *mfc, **nptr;
1309 u_long i;
1310
1311 MFC6_LOCK_ASSERT();
1312
1313 for (i = 0; i < MF6CTBLSIZ; i++) {
1314 if (n6expire[i] == 0)
1315 continue;
1316 nptr = &mf6ctable[i];
1317 while ((mfc = *nptr) != NULL) {
1318 rte = mfc->mf6c_stall;
1319 /*
1320 * Skip real cache entries
1321 * Make sure it wasn't marked to not expire (shouldn't happen)
1322 * If it expires now
1323 */
1324 if (rte != NULL &&
1325 mfc->mf6c_expire != 0 &&
1326 --mfc->mf6c_expire == 0) {
1327 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1328 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1329 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1330 /*
1331 * drop all the packets
1332 * free the mbuf with the pkt, if, timing info
1333 */
1334 do {
1335 struct rtdetq *n = rte->next;
1336 m_freem(rte->m);
1337 free(rte, M_MRTABLE6);
1338 rte = n;
1339 } while (rte != NULL);
1340 MRT6STAT_INC(mrt6s_cache_cleanups);
1341 n6expire[i]--;
1342
1343 *nptr = mfc->mf6c_next;
1344 free(mfc, M_MRTABLE6);
1345 } else {
1346 nptr = &mfc->mf6c_next;
1347 }
1348 }
1349 }
1350 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1351 expire_upcalls, NULL);
1352 }
1353
1354 /*
1355 * Packet forwarding routine once entry in the cache is made
1356 */
1357 static int
ip6_mdq(struct mbuf * m,struct ifnet * ifp,struct mf6c * rt)1358 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1359 {
1360 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1361 mifi_t mifi, iif;
1362 struct mif6 *mifp;
1363 int plen = m->m_pkthdr.len;
1364 struct in6_addr src0, dst0; /* copies for local work */
1365 u_int32_t iszone, idzone, oszone, odzone;
1366 int error = 0;
1367
1368 M_ASSERTMAPPED(m);
1369
1370 /*
1371 * Don't forward if it didn't arrive from the parent mif
1372 * for its origin.
1373 */
1374 mifi = rt->mf6c_parent;
1375 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1376 /* came in the wrong interface */
1377 MRT6_DLOG(DEBUG_FORWARD,
1378 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1379 mifi, mif6table[mifi].m6_ifp->if_index);
1380 MRT6STAT_INC(mrt6s_wrong_if);
1381 rt->mf6c_wrong_if++;
1382 /*
1383 * If we are doing PIM processing, and we are forwarding
1384 * packets on this interface, send a message to the
1385 * routing daemon.
1386 */
1387 /* have to make sure this is a valid mif */
1388 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1389 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1390 /*
1391 * Check the M_LOOP flag to avoid an
1392 * unnecessary PIM assert.
1393 * XXX: M_LOOP is an ad-hoc hack...
1394 */
1395 static struct sockaddr_in6 sin6 =
1396 { sizeof(sin6), AF_INET6 };
1397
1398 struct mbuf *mm;
1399 struct mrt6msg *im;
1400 #ifdef MRT6_OINIT
1401 struct omrt6msg *oim;
1402 #endif
1403
1404 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
1405 M_NOWAIT);
1406 if (mm &&
1407 (!M_WRITABLE(mm) ||
1408 mm->m_len < sizeof(struct ip6_hdr)))
1409 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1410 if (mm == NULL)
1411 return (ENOBUFS);
1412
1413 #ifdef MRT6_OINIT
1414 oim = NULL;
1415 #endif
1416 im = NULL;
1417 switch (V_ip6_mrouter_ver) {
1418 #ifdef MRT6_OINIT
1419 case MRT6_OINIT:
1420 oim = mtod(mm, struct omrt6msg *);
1421 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1422 oim->im6_mbz = 0;
1423 break;
1424 #endif
1425 case MRT6_INIT:
1426 im = mtod(mm, struct mrt6msg *);
1427 im->im6_msgtype = MRT6MSG_WRONGMIF;
1428 im->im6_mbz = 0;
1429 break;
1430 default:
1431 m_freem(mm);
1432 return (EINVAL);
1433 }
1434
1435 for (mifp = mif6table, iif = 0;
1436 iif < nummifs && mifp &&
1437 mifp->m6_ifp != ifp;
1438 mifp++, iif++)
1439 ;
1440
1441 switch (V_ip6_mrouter_ver) {
1442 #ifdef MRT6_OINIT
1443 case MRT6_OINIT:
1444 oim->im6_mif = iif;
1445 sin6.sin6_addr = oim->im6_src;
1446 break;
1447 #endif
1448 case MRT6_INIT:
1449 im->im6_mif = iif;
1450 sin6.sin6_addr = im->im6_src;
1451 break;
1452 }
1453
1454 MRT6STAT_INC(mrt6s_upcalls);
1455
1456 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1457 MRT6_DLOG(DEBUG_ANY,
1458 "ip6_mrouter socket queue full");
1459 MRT6STAT_INC(mrt6s_upq_sockfull);
1460 return (ENOBUFS);
1461 } /* if socket Q full */
1462 } /* if PIM */
1463 return (0);
1464 } /* if wrong iif */
1465
1466 /* If I sourced this packet, it counts as output, else it was input. */
1467 if (m->m_pkthdr.rcvif == NULL) {
1468 /* XXX: is rcvif really NULL when output?? */
1469 mif6table[mifi].m6_pkt_out++;
1470 mif6table[mifi].m6_bytes_out += plen;
1471 } else {
1472 mif6table[mifi].m6_pkt_in++;
1473 mif6table[mifi].m6_bytes_in += plen;
1474 }
1475 rt->mf6c_pkt_cnt++;
1476 rt->mf6c_byte_cnt += plen;
1477
1478 /*
1479 * For each mif, forward a copy of the packet if there are group
1480 * members downstream on the interface.
1481 */
1482 src0 = ip6->ip6_src;
1483 dst0 = ip6->ip6_dst;
1484 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1485 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1486 IP6STAT_INC(ip6s_badscope);
1487 return (error);
1488 }
1489 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1490 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1491 /*
1492 * check if the outgoing packet is going to break
1493 * a scope boundary.
1494 * XXX For packets through PIM register tunnel
1495 * interface, we believe a routing daemon.
1496 */
1497 if (!(mif6table[rt->mf6c_parent].m6_flags &
1498 MIFF_REGISTER) &&
1499 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1500 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1501 &oszone) ||
1502 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1503 &odzone) ||
1504 iszone != oszone ||
1505 idzone != odzone) {
1506 IP6STAT_INC(ip6s_badscope);
1507 continue;
1508 }
1509 }
1510
1511 mifp->m6_pkt_out++;
1512 mifp->m6_bytes_out += plen;
1513 if (mifp->m6_flags & MIFF_REGISTER)
1514 register_send(ip6, mifp, m);
1515 else
1516 phyint_send(ip6, mifp, m);
1517 }
1518 }
1519 return (0);
1520 }
1521
1522 static void
phyint_send(struct ip6_hdr * ip6,struct mif6 * mifp,struct mbuf * m)1523 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1524 {
1525 #ifdef MRT6DEBUG
1526 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1527 #endif
1528 struct mbuf *mb_copy;
1529 struct ifnet *ifp = mifp->m6_ifp;
1530 int error __unused = 0;
1531 u_long linkmtu;
1532
1533 M_ASSERTMAPPED(m);
1534
1535 /*
1536 * Make a new reference to the packet; make sure that
1537 * the IPv6 header is actually copied, not just referenced,
1538 * so that ip6_output() only scribbles on the copy.
1539 */
1540 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1541 if (mb_copy &&
1542 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1543 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1544 if (mb_copy == NULL) {
1545 return;
1546 }
1547 /* set MCAST flag to the outgoing packet */
1548 mb_copy->m_flags |= M_MCAST;
1549
1550 /*
1551 * If we sourced the packet, call ip6_output since we may devide
1552 * the packet into fragments when the packet is too big for the
1553 * outgoing interface.
1554 * Otherwise, we can simply send the packet to the interface
1555 * sending queue.
1556 */
1557 if (m->m_pkthdr.rcvif == NULL) {
1558 struct ip6_moptions im6o;
1559 struct epoch_tracker et;
1560
1561 im6o.im6o_multicast_ifp = ifp;
1562 /* XXX: ip6_output will override ip6->ip6_hlim */
1563 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1564 im6o.im6o_multicast_loop = 1;
1565 NET_EPOCH_ENTER(et);
1566 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1567 NULL, NULL);
1568 NET_EPOCH_EXIT(et);
1569
1570 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1571 (uint16_t)(mifp - mif6table), error);
1572 return;
1573 }
1574
1575 /*
1576 * If configured to loop back multicasts by default,
1577 * loop back a copy now.
1578 */
1579 if (in6_mcast_loop)
1580 ip6_mloopback(ifp, m);
1581
1582 /*
1583 * Put the packet into the sending queue of the outgoing interface
1584 * if it would fit in the MTU of the interface.
1585 */
1586 linkmtu = IN6_LINKMTU(ifp);
1587 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1588 struct sockaddr_in6 dst6;
1589
1590 bzero(&dst6, sizeof(dst6));
1591 dst6.sin6_len = sizeof(struct sockaddr_in6);
1592 dst6.sin6_family = AF_INET6;
1593 dst6.sin6_addr = ip6->ip6_dst;
1594
1595 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1596 /*
1597 * We just call if_output instead of nd6_output here, since
1598 * we need no ND for a multicast forwarded packet...right?
1599 */
1600 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1601 error = (*ifp->if_output)(ifp, mb_copy,
1602 (struct sockaddr *)&dst6, NULL);
1603 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1604 (uint16_t)(mifp - mif6table), error);
1605 } else {
1606 /*
1607 * pMTU discovery is intentionally disabled by default, since
1608 * various router may notify pMTU in multicast, which can be
1609 * a DDoS to a router
1610 */
1611 if (V_ip6_mcast_pmtu)
1612 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1613 else {
1614 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1615 "g %s size %d (discarded)", if_name(ifp),
1616 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1617 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1618 mb_copy->m_pkthdr.len);
1619 m_freem(mb_copy); /* simply discard the packet */
1620 }
1621 }
1622 }
1623
1624 static int
register_send(struct ip6_hdr * ip6,struct mif6 * mif,struct mbuf * m)1625 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1626 {
1627 #ifdef MRT6DEBUG
1628 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1629 #endif
1630 struct mbuf *mm;
1631 int i, len = m->m_pkthdr.len;
1632 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1633 struct mrt6msg *im6;
1634
1635 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1636 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1637 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1638 PIM6STAT_INC(pim6s_snd_registers);
1639
1640 /* Make a copy of the packet to send to the user level process. */
1641 mm = m_gethdr(M_NOWAIT, MT_DATA);
1642 if (mm == NULL)
1643 return (ENOBUFS);
1644 mm->m_data += max_linkhdr;
1645 mm->m_len = sizeof(struct ip6_hdr);
1646
1647 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
1648 m_freem(mm);
1649 return (ENOBUFS);
1650 }
1651 i = MHLEN - M_LEADINGSPACE(mm);
1652 if (i > len)
1653 i = len;
1654 mm = m_pullup(mm, i);
1655 if (mm == NULL)
1656 return (ENOBUFS);
1657 /* TODO: check it! */
1658 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1659
1660 /*
1661 * Send message to routing daemon
1662 */
1663 sin6.sin6_addr = ip6->ip6_src;
1664
1665 im6 = mtod(mm, struct mrt6msg *);
1666 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1667 im6->im6_mbz = 0;
1668
1669 im6->im6_mif = mif - mif6table;
1670
1671 /* iif info is not given for reg. encap.n */
1672 MRT6STAT_INC(mrt6s_upcalls);
1673
1674 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1675 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1676 MRT6STAT_INC(mrt6s_upq_sockfull);
1677 return (ENOBUFS);
1678 }
1679 return (0);
1680 }
1681
1682 /*
1683 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1684 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1685 * into the kernel.
1686 */
1687 static int
pim6_encapcheck(const struct mbuf * m __unused,int off __unused,int proto __unused,void * arg __unused)1688 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
1689 int proto __unused, void *arg __unused)
1690 {
1691
1692 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1693 return (8); /* claim the datagram. */
1694 }
1695
1696 /*
1697 * PIM sparse mode hook
1698 * Receives the pim control messages, and passes them up to the listening
1699 * socket, using rip6_input.
1700 * The only message processed is the REGISTER pim message; the pim header
1701 * is stripped off, and the inner packet is passed to register_mforward.
1702 */
1703 static int
pim6_input(struct mbuf * m,int off,int proto,void * arg __unused)1704 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
1705 {
1706 struct pim *pim; /* pointer to a pim struct */
1707 struct ip6_hdr *ip6;
1708 int pimlen;
1709 int minlen;
1710
1711 PIM6STAT_INC(pim6s_rcv_total);
1712
1713 /*
1714 * Validate lengths
1715 */
1716 pimlen = m->m_pkthdr.len - off;
1717 if (pimlen < PIM_MINLEN) {
1718 PIM6STAT_INC(pim6s_rcv_tooshort);
1719 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1720 m_freem(m);
1721 return (IPPROTO_DONE);
1722 }
1723
1724 /*
1725 * if the packet is at least as big as a REGISTER, go ahead
1726 * and grab the PIM REGISTER header size, to avoid another
1727 * possible m_pullup() later.
1728 *
1729 * PIM_MINLEN == pimhdr + u_int32 == 8
1730 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1731 */
1732 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1733
1734 /*
1735 * Make sure that the IP6 and PIM headers in contiguous memory, and
1736 * possibly the PIM REGISTER header
1737 */
1738 if (m->m_len < off + minlen) {
1739 m = m_pullup(m, off + minlen);
1740 if (m == NULL) {
1741 IP6STAT_INC(ip6s_exthdrtoolong);
1742 return (IPPROTO_DONE);
1743 }
1744 }
1745 ip6 = mtod(m, struct ip6_hdr *);
1746 pim = (struct pim *)((caddr_t)ip6 + off);
1747
1748 #define PIM6_CHECKSUM
1749 #ifdef PIM6_CHECKSUM
1750 {
1751 int cksumlen;
1752
1753 /*
1754 * Validate checksum.
1755 * If PIM REGISTER, exclude the data packet
1756 */
1757 if (pim->pim_type == PIM_REGISTER)
1758 cksumlen = PIM_MINLEN;
1759 else
1760 cksumlen = pimlen;
1761
1762 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1763 PIM6STAT_INC(pim6s_rcv_badsum);
1764 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1765 m_freem(m);
1766 return (IPPROTO_DONE);
1767 }
1768 }
1769 #endif /* PIM_CHECKSUM */
1770
1771 /* PIM version check */
1772 if (pim->pim_ver != PIM_VERSION) {
1773 PIM6STAT_INC(pim6s_rcv_badversion);
1774 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1775 "incorrect version %d, expecting %d",
1776 pim->pim_ver, PIM_VERSION);
1777 m_freem(m);
1778 return (IPPROTO_DONE);
1779 }
1780
1781 if (pim->pim_type == PIM_REGISTER) {
1782 /*
1783 * since this is a REGISTER, we'll make a copy of the register
1784 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1785 * routing daemon.
1786 */
1787 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1788
1789 struct mbuf *mcp;
1790 struct ip6_hdr *eip6;
1791 u_int32_t *reghdr;
1792 #ifdef MRT6DEBUG
1793 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1794 #endif
1795
1796 PIM6STAT_INC(pim6s_rcv_registers);
1797
1798 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1799 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1800 reg_mif_num);
1801 m_freem(m);
1802 return (IPPROTO_DONE);
1803 }
1804
1805 reghdr = (u_int32_t *)(pim + 1);
1806
1807 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1808 goto pim6_input_to_daemon;
1809
1810 /*
1811 * Validate length
1812 */
1813 if (pimlen < PIM6_REG_MINLEN) {
1814 PIM6STAT_INC(pim6s_rcv_tooshort);
1815 PIM6STAT_INC(pim6s_rcv_badregisters);
1816 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1817 "size too small %d from %s",
1818 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1819 m_freem(m);
1820 return (IPPROTO_DONE);
1821 }
1822
1823 eip6 = (struct ip6_hdr *) (reghdr + 1);
1824 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1825 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1826 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1827 ntohs(eip6->ip6_plen));
1828
1829 /* verify the version number of the inner packet */
1830 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1831 PIM6STAT_INC(pim6s_rcv_badregisters);
1832 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1833 "of the inner packet",
1834 (eip6->ip6_vfc & IPV6_VERSION));
1835 m_freem(m);
1836 return (IPPROTO_DONE);
1837 }
1838
1839 /* verify the inner packet is destined to a mcast group */
1840 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1841 PIM6STAT_INC(pim6s_rcv_badregisters);
1842 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1843 "is not multicast %s",
1844 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1845 m_freem(m);
1846 return (IPPROTO_DONE);
1847 }
1848
1849 /*
1850 * make a copy of the whole header to pass to the daemon later.
1851 */
1852 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
1853 if (mcp == NULL) {
1854 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1855 "could not copy register head");
1856 m_freem(m);
1857 return (IPPROTO_DONE);
1858 }
1859
1860 /*
1861 * forward the inner ip6 packet; point m_data at the inner ip6.
1862 */
1863 m_adj(m, off + PIM_MINLEN);
1864 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1865 "src %s, dst %s, mif %d",
1866 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1867 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1868
1869 if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1870 dst.sin6_family, 0);
1871
1872 /* prepare the register head to send to the mrouting daemon */
1873 m = mcp;
1874 }
1875
1876 /*
1877 * Pass the PIM message up to the daemon; if it is a register message
1878 * pass the 'head' only up to the daemon. This includes the
1879 * encapsulator ip6 header, pim header, register header and the
1880 * encapsulated ip6 header.
1881 */
1882 pim6_input_to_daemon:
1883 return (rip6_input(&m, &off, proto));
1884 }
1885
1886 static int
ip6_mroute_modevent(module_t mod,int type,void * unused)1887 ip6_mroute_modevent(module_t mod, int type, void *unused)
1888 {
1889
1890 switch (type) {
1891 case MOD_LOAD:
1892 MROUTER6_LOCK_INIT();
1893 MFC6_LOCK_INIT();
1894 MIF6_LOCK_INIT();
1895
1896 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
1897 NULL, M_WAITOK);
1898 if (pim6_encap_cookie == NULL) {
1899 printf("ip6_mroute: unable to attach pim6 encap\n");
1900 MIF6_LOCK_DESTROY();
1901 MFC6_LOCK_DESTROY();
1902 MROUTER6_LOCK_DESTROY();
1903 return (EINVAL);
1904 }
1905
1906 ip6_mforward = X_ip6_mforward;
1907 ip6_mrouter_done = X_ip6_mrouter_done;
1908 ip6_mrouter_get = X_ip6_mrouter_get;
1909 ip6_mrouter_set = X_ip6_mrouter_set;
1910 mrt6_ioctl = X_mrt6_ioctl;
1911 break;
1912
1913 case MOD_UNLOAD:
1914 if (V_ip6_mrouter != NULL)
1915 return EINVAL;
1916
1917 if (pim6_encap_cookie) {
1918 ip6_encap_detach(pim6_encap_cookie);
1919 pim6_encap_cookie = NULL;
1920 }
1921 X_ip6_mrouter_done();
1922 ip6_mforward = NULL;
1923 ip6_mrouter_done = NULL;
1924 ip6_mrouter_get = NULL;
1925 ip6_mrouter_set = NULL;
1926 mrt6_ioctl = NULL;
1927
1928 MIF6_LOCK_DESTROY();
1929 MFC6_LOCK_DESTROY();
1930 MROUTER6_LOCK_DESTROY();
1931 break;
1932
1933 default:
1934 return (EOPNOTSUPP);
1935 }
1936
1937 return (0);
1938 }
1939
1940 static moduledata_t ip6_mroutemod = {
1941 "ip6_mroute",
1942 ip6_mroute_modevent,
1943 0
1944 };
1945
1946 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);
1947