]> git.saurik.com Git - apple/xnu.git/blob - bsd/netinet6/ip6_mroute.c
projects / apple / xnu.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
xnu-1228.7.58.tar.gz
[apple/xnu.git] / bsd / netinet6 / ip6_mroute.c
1 /*
2 * Copyright (c) 2003-2007 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /* $FreeBSD: src/sys/netinet6/ip6_mroute.c,v 1.16.2.1 2002/12/18 21:39:40 suz Exp $ */
29 /* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ */
30
31 /*
32 * Copyright (C) 1998 WIDE Project.
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the project nor the names of its contributors
44 * may be used to endorse or promote products derived from this software
45 * without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57 * SUCH DAMAGE.
58 */
59 /*
60 * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
61 * support for mandatory and extensible security protections. This notice
62 * is included in support of clause 2.2 (b) of the Apple Public License,
63 * Version 2.0.
64 */
65
66 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */
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 Fenenr, PARC, April 1994
77 *
78 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
79 */
80
81
82 #include <sys/param.h>
83 #include <sys/systm.h>
84 #include <sys/malloc.h>
85 #include <sys/mbuf.h>
86 #include <sys/socket.h>
87 #include <sys/socketvar.h>
88 #include <sys/sockio.h>
89 #include <sys/protosw.h>
90 #include <sys/errno.h>
91 #include <sys/time.h>
92 #include <sys/kernel.h>
93 #include <sys/syslog.h>
94 #include <kern/locks.h>
95
96 #include <net/if.h>
97 #include <net/route.h>
98 #include <net/raw_cb.h>
99 #include <net/dlil.h>
100 #include <net/net_osdep.h>
101
102 #include <netinet/in.h>
103 #include <netinet/in_var.h>
104
105 #include <netinet/ip6.h>
106 #include <netinet6/ip6_var.h>
107 #include <netinet6/ip6_mroute.h>
108 #include <netinet6/pim6.h>
109 #include <netinet6/pim6_var.h>
110
111 #if CONFIG_MACF_NET
112 #include <security/mac.h>
113 #endif /* MAC_NET */
114
115 #ifndef __APPLE__
116 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry");
117 #endif
118
119 #define M_HASCL(m) ((m)->m_flags & M_EXT)
120
121 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
122 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
123
124 static int set_pim6(int *);
125 static int socket_send(struct socket *, struct mbuf *,
126 struct sockaddr_in6 *);
127 static int register_send(struct ip6_hdr *, struct mif6 *,
128 struct mbuf *);
129
130 extern lck_mtx_t *ip6_mutex;
131 /*
132 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,
133 * except for netstat or debugging purposes.
134 */
135 struct socket *ip6_mrouter = NULL;
136 int ip6_mrouter_ver = 0;
137 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */
138 struct mrt6stat mrt6stat;
139
140 #define NO_RTE_FOUND 0x1
141 #define RTE_FOUND 0x2
142
143 struct mf6c *mf6ctable[MF6CTBLSIZ];
144 u_char n6expire[MF6CTBLSIZ];
145 static struct mif6 mif6table[MAXMIFS];
146 #if MRT6DEBUG
147 u_int mrt6debug = 0; /* debug level */
148 #define DEBUG_MFC 0x02
149 #define DEBUG_FORWARD 0x04
150 #define DEBUG_EXPIRE 0x08
151 #define DEBUG_XMIT 0x10
152 #define DEBUG_REG 0x20
153 #define DEBUG_PIM 0x40
154 #endif
155
156 static void expire_upcalls(void *);
157
158 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
159 #define UPCALL_EXPIRE 6 /* number of timeouts */
160
161 #if INET
162 #if MROUTING
163 extern struct socket *ip_mrouter;
164 #endif
165 #endif
166
167 /*
168 * 'Interfaces' associated with decapsulator (so we can tell
169 * packets that went through it from ones that get reflected
170 * by a broken gateway). These interfaces are never linked into
171 * the system ifnet list & no routes point to them. I.e., packets
172 * can't be sent this way. They only exist as a placeholder for
173 * multicast source verification.
174 */
175 struct ifnet multicast_register_if;
176
177 #define ENCAP_HOPS 64
178
179 /*
180 * Private variables.
181 */
182 static mifi_t nummifs = 0;
183 static mifi_t reg_mif_num = (mifi_t)-1;
184
185 static struct pim6stat pim6stat;
186 static int pim6;
187
188 /*
189 * Hash function for a source, group entry
190 */
191 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
192 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
193 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
194 (g).s6_addr32[2] ^ (g).s6_addr32[3])
195
196 /*
197 * Find a route for a given origin IPv6 address and Multicast group address.
198 * Quality of service parameter to be added in the future!!!
199 */
200
201 #define MF6CFIND(o, g, rt) do { \
202 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
203 rt = NULL; \
204 mrt6stat.mrt6s_mfc_lookups++; \
205 while (_rt) { \
206 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
207 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
208 (_rt->mf6c_stall == NULL)) { \
209 rt = _rt; \
210 break; \
211 } \
212 _rt = _rt->mf6c_next; \
213 } \
214 if (rt == NULL) { \
215 mrt6stat.mrt6s_mfc_misses++; \
216 } \
217 } while (0)
218
219 /*
220 * Macros to compute elapsed time efficiently
221 * Borrowed from Van Jacobson's scheduling code
222 */
223 #define TV_DELTA(a, b, delta) do { \
224 int xxs; \
225 \
226 delta = (a).tv_usec - (b).tv_usec; \
227 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
228 switch (xxs) { \
229 case 2: \
230 delta += 1000000; \
231 /* fall through */ \
232 case 1: \
233 delta += 1000000; \
234 break; \
235 default: \
236 delta += (1000000 * xxs); \
237 } \
238 } \
239 } while (0)
240
241 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
242 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
243
244 #if UPCALL_TIMING
245 #define UPCALL_MAX 50
246 u_long upcall_data[UPCALL_MAX + 1];
247 static void collate();
248 #endif /* UPCALL_TIMING */
249
250 static int get_sg_cnt(struct sioc_sg_req6 *);
251 static int get_mif6_cnt(struct sioc_mif_req6 *);
252 static int ip6_mrouter_init(struct socket *, int, int);
253 static int add_m6if(struct mif6ctl *);
254 static int del_m6if(mifi_t *);
255 static int add_m6fc(struct mf6cctl *);
256 static int del_m6fc(struct mf6cctl *);
257
258 #ifndef __APPLE__
259 static struct callout expire_upcalls_ch;
260 #endif
261 /*
262 * Handle MRT setsockopt commands to modify the multicast routing tables.
263 */
264 int
265 ip6_mrouter_set(so, sopt)
266 struct socket *so;
267 struct sockopt *sopt;
268 {
269 int error = 0;
270 int optval;
271 struct mif6ctl mifc;
272 struct mf6cctl mfcc;
273 mifi_t mifi;
274
275 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
276 return (EACCES);
277
278 switch (sopt->sopt_name) {
279 case MRT6_INIT:
280 #if MRT6_OINIT
281 case MRT6_OINIT:
282 #endif
283 error = sooptcopyin(sopt, &optval, sizeof(optval),
284 sizeof(optval));
285 if (error)
286 break;
287 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
288 break;
289 case MRT6_DONE:
290 error = ip6_mrouter_done();
291 break;
292 case MRT6_ADD_MIF:
293 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
294 if (error)
295 break;
296 error = add_m6if(&mifc);
297 break;
298 case MRT6_ADD_MFC:
299 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
300 if (error)
301 break;
302 error = add_m6fc(&mfcc);
303 break;
304 case MRT6_DEL_MFC:
305 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
306 if (error)
307 break;
308 error = del_m6fc(&mfcc);
309 break;
310 case MRT6_DEL_MIF:
311 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
312 if (error)
313 break;
314 error = del_m6if(&mifi);
315 break;
316 case MRT6_PIM:
317 error = sooptcopyin(sopt, &optval, sizeof(optval),
318 sizeof(optval));
319 if (error)
320 break;
321 error = set_pim6(&optval);
322 break;
323 default:
324 error = EOPNOTSUPP;
325 break;
326 }
327
328 return (error);
329 }
330
331 /*
332 * Handle MRT getsockopt commands
333 */
334 int
335 ip6_mrouter_get(so, sopt)
336 struct socket *so;
337 struct sockopt *sopt;
338 {
339 int error = 0;
340
341 if (so != ip6_mrouter) return EACCES;
342
343 switch (sopt->sopt_name) {
344 case MRT6_PIM:
345 error = sooptcopyout(sopt, &pim6, sizeof(pim6));
346 break;
347 }
348 return (error);
349 }
350
351 /*
352 * Handle ioctl commands to obtain information from the cache
353 */
354 int
355 mrt6_ioctl(cmd, data)
356 int cmd;
357 caddr_t data;
358 {
359 int error = 0;
360
361 switch (cmd) {
362 case SIOCGETSGCNT_IN6:
363 return(get_sg_cnt((struct sioc_sg_req6 *)data));
364 break; /* for safety */
365 case SIOCGETMIFCNT_IN6:
366 return(get_mif6_cnt((struct sioc_mif_req6 *)data));
367 break; /* for safety */
368 default:
369 return (EINVAL);
370 break;
371 }
372 return error;
373 }
374
375 /*
376 * returns the packet, byte, rpf-failure count for the source group provided
377 */
378 static int
379 get_sg_cnt(req)
380 struct sioc_sg_req6 *req;
381 {
382 struct mf6c *rt;
383
384 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
385 if (rt != NULL) {
386 req->pktcnt = rt->mf6c_pkt_cnt;
387 req->bytecnt = rt->mf6c_byte_cnt;
388 req->wrong_if = rt->mf6c_wrong_if;
389 } else
390 return(ESRCH);
391 #if 0
392 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
393 #endif
394
395 return 0;
396 }
397
398 /*
399 * returns the input and output packet and byte counts on the mif provided
400 */
401 static int
402 get_mif6_cnt(req)
403 struct sioc_mif_req6 *req;
404 {
405 mifi_t mifi = req->mifi;
406
407 if (mifi >= nummifs)
408 return EINVAL;
409
410 req->icount = mif6table[mifi].m6_pkt_in;
411 req->ocount = mif6table[mifi].m6_pkt_out;
412 req->ibytes = mif6table[mifi].m6_bytes_in;
413 req->obytes = mif6table[mifi].m6_bytes_out;
414
415 return 0;
416 }
417
418 static int
419 set_pim6(i)
420 int *i;
421 {
422 if ((*i != 1) && (*i != 0))
423 return EINVAL;
424
425 pim6 = *i;
426
427 return 0;
428 }
429
430 /*
431 * Enable multicast routing
432 */
433 static int
434 ip6_mrouter_init(so, v, cmd)
435 struct socket *so;
436 int v;
437 int cmd;
438 {
439 #if MRT6DEBUG
440 if (mrt6debug)
441 log(LOG_DEBUG,
442 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
443 so->so_type, so->so_proto->pr_protocol);
444 #endif
445
446 if (so->so_type != SOCK_RAW ||
447 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
448 return EOPNOTSUPP;
449
450 if (v != 1)
451 return (ENOPROTOOPT);
452
453 if (ip6_mrouter != NULL) return EADDRINUSE;
454
455 ip6_mrouter = so;
456 ip6_mrouter_ver = cmd;
457
458 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
459 bzero((caddr_t)n6expire, sizeof(n6expire));
460
461 pim6 = 0;/* used for stubbing out/in pim stuff */
462
463 #ifndef __APPLE__
464 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
465 expire_upcalls, NULL);
466 #else
467 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
468 #endif
469
470 #if MRT6DEBUG
471 if (mrt6debug)
472 log(LOG_DEBUG, "ip6_mrouter_init\n");
473 #endif
474
475 return 0;
476 }
477
478 /*
479 * Disable multicast routing
480 */
481 int
482 ip6_mrouter_done()
483 {
484 mifi_t mifi;
485 int i;
486 struct mf6c *rt;
487 struct rtdetq *rte;
488
489
490 /*
491 * For each phyint in use, disable promiscuous reception of all IPv6
492 * multicasts.
493 */
494 #if INET
495 #if MROUTING
496 /*
497 * If there is still IPv4 multicast routing daemon,
498 * we remain interfaces to receive all muliticasted packets.
499 * XXX: there may be an interface in which the IPv4 multicast
500 * daemon is not interested...
501 */
502 if (!ip_mrouter)
503 #endif
504 #endif
505 {
506 for (mifi = 0; mifi < nummifs; mifi++) {
507 if (mif6table[mifi].m6_ifp &&
508 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
509 #ifdef __APPLE__
510 if_allmulti(mif6table[mifi].m6_ifp, 0);
511 #else
512 {
513 struct ifnet *ifp;
514 struct in6_ifreq ifr;
515
516 ifr.ifr_addr.sin6_family = AF_INET6;
517 ifr.ifr_addr.sin6_addr= in6addr_any;
518 ifp = mif6table[mifi].m6_ifp;
519 ifnet_ioctl(ifp, 0, SIOCDELMULTI, &ifr);
520 }
521 #endif
522 }
523 }
524 }
525 #if notyet
526 bzero((caddr_t)qtable, sizeof(qtable));
527 bzero((caddr_t)tbftable, sizeof(tbftable));
528 #endif
529 bzero((caddr_t)mif6table, sizeof(mif6table));
530 nummifs = 0;
531
532 pim6 = 0; /* used to stub out/in pim specific code */
533
534 #ifndef __APPLE__
535 callout_stop(&expire_upcalls_ch);
536 #else
537 untimeout(expire_upcalls, (caddr_t)NULL);
538 #endif
539
540 /*
541 * Free all multicast forwarding cache entries.
542 *###LD 5/27 needs locking
543 */
544 for (i = 0; i < MF6CTBLSIZ; i++) {
545 rt = mf6ctable[i];
546 while (rt) {
547 struct mf6c *frt;
548
549 for (rte = rt->mf6c_stall; rte != NULL; ) {
550 struct rtdetq *n = rte->next;
551
552 m_free(rte->m);
553 FREE(rte, M_MRTABLE);
554 rte = n;
555 }
556 frt = rt;
557 rt = rt->mf6c_next;
558 FREE(frt, M_MRTABLE);
559 }
560 }
561
562 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
563
564 /*
565 * Reset de-encapsulation cache
566 */
567 reg_mif_num = -1;
568
569 ip6_mrouter = NULL;
570 ip6_mrouter_ver = 0;
571
572
573 #if MRT6DEBUG
574 if (mrt6debug)
575 log(LOG_DEBUG, "ip6_mrouter_done\n");
576 #endif
577
578 return 0;
579 }
580
581 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 ,
582 0, 0, IN6ADDR_ANY_INIT, 0};
583
584 /*
585 * Add a mif to the mif table
586 */
587 static int
588 add_m6if(mifcp)
589 struct mif6ctl *mifcp;
590 {
591 struct mif6 *mifp;
592 struct ifnet *ifp;
593 int error;
594 #if notyet
595 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
596 #endif
597
598 if (mifcp->mif6c_mifi >= MAXMIFS)
599 return EINVAL;
600 mifp = mif6table + mifcp->mif6c_mifi;
601 if (mifp->m6_ifp)
602 return EADDRINUSE; /* XXX: is it appropriate? */
603 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
604 return ENXIO;
605 ifp = ifindex2ifnet[mifcp->mif6c_pifi];
606
607 if (mifcp->mif6c_flags & MIFF_REGISTER) {
608 if (reg_mif_num == (mifi_t)-1) {
609 multicast_register_if.if_name = "register_mif";
610 multicast_register_if.if_flags |= IFF_LOOPBACK;
611 multicast_register_if.if_index = mifcp->mif6c_mifi;
612 reg_mif_num = mifcp->mif6c_mifi;
613 }
614
615 ifp = &multicast_register_if;
616
617 } /* if REGISTER */
618 else {
619 /* Make sure the interface supports multicast */
620 if ((ifp->if_flags & IFF_MULTICAST) == 0)
621 return EOPNOTSUPP;
622
623 error = if_allmulti(ifp, 1);
624 if (error)
625 return error;
626 }
627
628 mifp->m6_flags = mifcp->mif6c_flags;
629 mifp->m6_ifp = ifp;
630 #if notyet
631 /* scaling up here allows division by 1024 in critical code */
632 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
633 #endif
634 /* initialize per mif pkt counters */
635 mifp->m6_pkt_in = 0;
636 mifp->m6_pkt_out = 0;
637 mifp->m6_bytes_in = 0;
638 mifp->m6_bytes_out = 0;
639
640 /* Adjust nummifs up if the mifi is higher than nummifs */
641 if (nummifs <= mifcp->mif6c_mifi)
642 nummifs = mifcp->mif6c_mifi + 1;
643
644 #if MRT6DEBUG
645 if (mrt6debug)
646 log(LOG_DEBUG,
647 "add_mif #%d, phyint %s%d\n",
648 mifcp->mif6c_mifi,
649 ifp->if_name, ifp->if_unit);
650 #endif
651
652 return 0;
653 }
654
655 /*
656 * Delete a mif from the mif table
657 */
658 static int
659 del_m6if(mifip)
660 mifi_t *mifip;
661 {
662 struct mif6 *mifp = mif6table + *mifip;
663 mifi_t mifi;
664 struct ifnet *ifp;
665
666 if (*mifip >= nummifs)
667 return EINVAL;
668 if (mifp->m6_ifp == NULL)
669 return EINVAL;
670
671
672 if (!(mifp->m6_flags & MIFF_REGISTER)) {
673 /*
674 * XXX: what if there is yet IPv4 multicast daemon
675 * using the interface?
676 */
677 ifp = mifp->m6_ifp;
678
679 if_allmulti(ifp, 0);
680 }
681
682 #if notyet
683 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
684 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
685 #endif
686 bzero((caddr_t)mifp, sizeof(*mifp));
687
688 /* Adjust nummifs down */
689 for (mifi = nummifs; mifi > 0; mifi--)
690 if (mif6table[mifi - 1].m6_ifp)
691 break;
692 nummifs = mifi;
693
694
695 #if MRT6DEBUG
696 if (mrt6debug)
697 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
698 #endif
699
700 return 0;
701 }
702
703 /*
704 * Add an mfc entry
705 */
706 static int
707 add_m6fc(mfccp)
708 struct mf6cctl *mfccp;
709 {
710 struct mf6c *rt;
711 u_long hash;
712 struct rtdetq *rte;
713 u_short nstl;
714
715 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
716 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
717
718 /* If an entry already exists, just update the fields */
719 if (rt) {
720 #if MRT6DEBUG
721 if (mrt6debug & DEBUG_MFC)
722 log(LOG_DEBUG,
723 "add_m6fc no upcall h %d o %s g %s p %x\n",
724 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
725 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
726 mfccp->mf6cc_parent);
727 #endif
728
729 rt->mf6c_parent = mfccp->mf6cc_parent;
730 rt->mf6c_ifset = mfccp->mf6cc_ifset;
731 return 0;
732 }
733
734 /*
735 * Find the entry for which the upcall was made and update
736 */
737 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
738 mfccp->mf6cc_mcastgrp.sin6_addr);
739 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
740 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
741 &mfccp->mf6cc_origin.sin6_addr) &&
742 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
743 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
744 (rt->mf6c_stall != NULL)) {
745
746 if (nstl++)
747 log(LOG_ERR,
748 "add_m6fc: %s o %s g %s p %x dbx %p\n",
749 "multiple kernel entries",
750 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
751 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
752 mfccp->mf6cc_parent, rt->mf6c_stall);
753
754 #if MRT6DEBUG
755 if (mrt6debug & DEBUG_MFC)
756 log(LOG_DEBUG,
757 "add_m6fc o %s g %s p %x dbg %x\n",
758 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
759 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
760 mfccp->mf6cc_parent, rt->mf6c_stall);
761 #endif
762
763 rt->mf6c_origin = mfccp->mf6cc_origin;
764 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
765 rt->mf6c_parent = mfccp->mf6cc_parent;
766 rt->mf6c_ifset = mfccp->mf6cc_ifset;
767 /* initialize pkt counters per src-grp */
768 rt->mf6c_pkt_cnt = 0;
769 rt->mf6c_byte_cnt = 0;
770 rt->mf6c_wrong_if = 0;
771
772 rt->mf6c_expire = 0; /* Don't clean this guy up */
773 n6expire[hash]--;
774
775 /* free packets Qed at the end of this entry */
776 for (rte = rt->mf6c_stall; rte != NULL; ) {
777 struct rtdetq *n = rte->next;
778 ip6_mdq(rte->m, rte->ifp, rt);
779 m_freem(rte->m);
780 #if UPCALL_TIMING
781 collate(&(rte->t));
782 #endif /* UPCALL_TIMING */
783 FREE(rte, M_MRTABLE);
784 rte = n;
785 }
786 rt->mf6c_stall = NULL;
787 }
788 }
789
790 /*
791 * It is possible that an entry is being inserted without an upcall
792 */
793 if (nstl == 0) {
794 #if MRT6DEBUG
795 if (mrt6debug & DEBUG_MFC)
796 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n",
797 hash,
798 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
799 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
800 mfccp->mf6cc_parent);
801 #endif
802
803 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
804
805 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
806 &mfccp->mf6cc_origin.sin6_addr)&&
807 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
808 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
809
810 rt->mf6c_origin = mfccp->mf6cc_origin;
811 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
812 rt->mf6c_parent = mfccp->mf6cc_parent;
813 rt->mf6c_ifset = mfccp->mf6cc_ifset;
814 /* initialize pkt counters per src-grp */
815 rt->mf6c_pkt_cnt = 0;
816 rt->mf6c_byte_cnt = 0;
817 rt->mf6c_wrong_if = 0;
818
819 if (rt->mf6c_expire)
820 n6expire[hash]--;
821 rt->mf6c_expire = 0;
822 }
823 }
824 if (rt == NULL) {
825 /* no upcall, so make a new entry */
826 rt = (struct mf6c *)_MALLOC(sizeof(*rt), M_MRTABLE,
827 M_NOWAIT);
828 if (rt == NULL) {
829 return ENOBUFS;
830 }
831
832 /* insert new entry at head of hash chain */
833 rt->mf6c_origin = mfccp->mf6cc_origin;
834 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
835 rt->mf6c_parent = mfccp->mf6cc_parent;
836 rt->mf6c_ifset = mfccp->mf6cc_ifset;
837 /* initialize pkt counters per src-grp */
838 rt->mf6c_pkt_cnt = 0;
839 rt->mf6c_byte_cnt = 0;
840 rt->mf6c_wrong_if = 0;
841 rt->mf6c_expire = 0;
842 rt->mf6c_stall = NULL;
843
844 /* link into table */
845 rt->mf6c_next = mf6ctable[hash];
846 mf6ctable[hash] = rt;
847 }
848 }
849 return 0;
850 }
851
852 #if UPCALL_TIMING
853 /*
854 * collect delay statistics on the upcalls
855 */
856 static void
857 collate(t)
858 struct timeval *t;
859 {
860 u_long d;
861 struct timeval tp;
862 u_long delta;
863
864 GET_TIME(tp);
865
866 if (TV_LT(*t, tp))
867 {
868 TV_DELTA(tp, *t, delta);
869
870 d = delta >> 10;
871 if (d > UPCALL_MAX)
872 d = UPCALL_MAX;
873
874 ++upcall_data[d];
875 }
876 }
877 #endif /* UPCALL_TIMING */
878
879 /*
880 * Delete an mfc entry
881 */
882 static int
883 del_m6fc(mfccp)
884 struct mf6cctl *mfccp;
885 {
886 struct sockaddr_in6 origin;
887 struct sockaddr_in6 mcastgrp;
888 struct mf6c *rt;
889 struct mf6c **nptr;
890 u_long hash;
891
892 origin = mfccp->mf6cc_origin;
893 mcastgrp = mfccp->mf6cc_mcastgrp;
894 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
895
896 #if MRT6DEBUG
897 if (mrt6debug & DEBUG_MFC)
898 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
899 ip6_sprintf(&origin.sin6_addr),
900 ip6_sprintf(&mcastgrp.sin6_addr));
901 #endif
902
903
904 nptr = &mf6ctable[hash];
905 while ((rt = *nptr) != NULL) {
906 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
907 &rt->mf6c_origin.sin6_addr) &&
908 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
909 &rt->mf6c_mcastgrp.sin6_addr) &&
910 rt->mf6c_stall == NULL)
911 break;
912
913 nptr = &rt->mf6c_next;
914 }
915 if (rt == NULL) {
916 return EADDRNOTAVAIL;
917 }
918
919 *nptr = rt->mf6c_next;
920 FREE(rt, M_MRTABLE);
921
922
923 return 0;
924 }
925
926 static int
927 socket_send(s, mm, src)
928 struct socket *s;
929 struct mbuf *mm;
930 struct sockaddr_in6 *src;
931 {
932 //### LD 5/27/04 needs locking!
933 //
934 if (s) {
935 if (sbappendaddr(&s->so_rcv,
936 (struct sockaddr *)src,
937 mm, (struct mbuf *)0, NULL) != 0) {
938 sorwakeup(s);
939 return 0;
940 }
941 }
942 return -1;
943 }
944
945 /*
946 * IPv6 multicast forwarding function. This function assumes that the packet
947 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
948 * pointed to by "ifp", and the packet is to be relayed to other networks
949 * that have members of the packet's destination IPv6 multicast group.
950 *
951 * The packet is returned unscathed to the caller, unless it is
952 * erroneous, in which case a non-zero return value tells the caller to
953 * discard it.
954 */
955
956 int
957 ip6_mforward(ip6, ifp, m)
958 struct ip6_hdr *ip6;
959 struct ifnet *ifp;
960 struct mbuf *m;
961 {
962 struct mf6c *rt;
963 struct mif6 *mifp;
964 struct mbuf *mm;
965 mifi_t mifi;
966 struct timeval timenow;
967
968 #if MRT6DEBUG
969 if (mrt6debug & DEBUG_FORWARD)
970 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
971 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
972 ifp->if_index);
973 #endif
974
975 /*
976 * Don't forward a packet with Hop limit of zero or one,
977 * or a packet destined to a local-only group.
978 */
979 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) ||
980 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
981 return 0;
982 ip6->ip6_hlim--;
983
984 /*
985 * Source address check: do not forward packets with unspecified
986 * source. It was discussed in July 2000, on ipngwg mailing list.
987 * This is rather more serious than unicast cases, because some
988 * MLD packets can be sent with the unspecified source address
989 * (although such packets must normally set 1 to the hop limit field).
990 */
991 getmicrotime(&timenow);
992 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
993 ip6stat.ip6s_cantforward++;
994 if (ip6_log_time + ip6_log_interval < timenow.tv_sec) {
995 ip6_log_time = timenow.tv_sec;
996 log(LOG_DEBUG,
997 "cannot forward "
998 "from %s to %s nxt %d received on %s\n",
999 ip6_sprintf(&ip6->ip6_src),
1000 ip6_sprintf(&ip6->ip6_dst),
1001 ip6->ip6_nxt,
1002 if_name(m->m_pkthdr.rcvif));
1003 }
1004 return 0;
1005 }
1006
1007 /*
1008 * Determine forwarding mifs from the forwarding cache table
1009 */
1010 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1011
1012 /* Entry exists, so forward if necessary */
1013 if (rt) {
1014 return (ip6_mdq(m, ifp, rt));
1015 } else {
1016 /*
1017 * If we don't have a route for packet's origin,
1018 * Make a copy of the packet &
1019 * send message to routing daemon
1020 */
1021
1022 struct mbuf *mb0;
1023 struct rtdetq *rte;
1024 u_long hash;
1025 /* int i, npkts;*/
1026 #if UPCALL_TIMING
1027 struct timeval tp;
1028
1029 GET_TIME(tp);
1030 #endif /* UPCALL_TIMING */
1031
1032 mrt6stat.mrt6s_no_route++;
1033 #if MRT6DEBUG
1034 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1035 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1036 ip6_sprintf(&ip6->ip6_src),
1037 ip6_sprintf(&ip6->ip6_dst));
1038 #endif
1039
1040 /*
1041 * Allocate mbufs early so that we don't do extra work if we
1042 * are just going to fail anyway.
1043 */
1044 rte = (struct rtdetq *)_MALLOC(sizeof(*rte), M_MRTABLE,
1045 M_NOWAIT);
1046 if (rte == NULL) {
1047 return ENOBUFS;
1048 }
1049 mb0 = m_copy(m, 0, M_COPYALL);
1050 /*
1051 * Pullup packet header if needed before storing it,
1052 * as other references may modify it in the meantime.
1053 */
1054 if (mb0 &&
1055 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1056 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1057 if (mb0 == NULL) {
1058 FREE(rte, M_MRTABLE);
1059 return ENOBUFS;
1060 }
1061
1062 /* is there an upcall waiting for this packet? */
1063 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1064 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1065 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1066 &rt->mf6c_origin.sin6_addr) &&
1067 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1068 &rt->mf6c_mcastgrp.sin6_addr) &&
1069 (rt->mf6c_stall != NULL))
1070 break;
1071 }
1072
1073 if (rt == NULL) {
1074 struct mrt6msg *im;
1075 #if MRT6_OINIT
1076 struct omrt6msg *oim;
1077 #endif
1078
1079 /* no upcall, so make a new entry */
1080 rt = (struct mf6c *)_MALLOC(sizeof(*rt), M_MRTABLE,
1081 M_NOWAIT);
1082 if (rt == NULL) {
1083 FREE(rte, M_MRTABLE);
1084 m_freem(mb0);
1085 return ENOBUFS;
1086 }
1087 /*
1088 * Make a copy of the header to send to the user
1089 * level process
1090 */
1091 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1092
1093 if (mm == NULL) {
1094 FREE(rte, M_MRTABLE);
1095 m_freem(mb0);
1096 FREE(rt, M_MRTABLE);
1097 return ENOBUFS;
1098 }
1099
1100 /*
1101 * Send message to routing daemon
1102 */
1103 sin6.sin6_addr = ip6->ip6_src;
1104
1105 im = NULL;
1106 #if MRT6_OINIT
1107 oim = NULL;
1108 #endif
1109 switch (ip6_mrouter_ver) {
1110 #if MRT6_OINIT
1111 case MRT6_OINIT:
1112 oim = mtod(mm, struct omrt6msg *);
1113 oim->im6_msgtype = MRT6MSG_NOCACHE;
1114 oim->im6_mbz = 0;
1115 break;
1116 #endif
1117 case MRT6_INIT:
1118 im = mtod(mm, struct mrt6msg *);
1119 im->im6_msgtype = MRT6MSG_NOCACHE;
1120 im->im6_mbz = 0;
1121 break;
1122 default:
1123 FREE(rte, M_MRTABLE);
1124 m_freem(mb0);
1125 FREE(rt, M_MRTABLE);
1126 return EINVAL;
1127 }
1128
1129 #if MRT6DEBUG
1130 if (mrt6debug & DEBUG_FORWARD)
1131 log(LOG_DEBUG,
1132 "getting the iif info in the kernel\n");
1133 #endif
1134
1135 for (mifp = mif6table, mifi = 0;
1136 mifi < nummifs && mifp->m6_ifp != ifp;
1137 mifp++, mifi++)
1138 ;
1139
1140 switch (ip6_mrouter_ver) {
1141 #if MRT6_OINIT
1142 case MRT6_OINIT:
1143 oim->im6_mif = mifi;
1144 break;
1145 #endif
1146 case MRT6_INIT:
1147 im->im6_mif = mifi;
1148 break;
1149 }
1150
1151 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1152 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1153 "socket queue full\n");
1154 mrt6stat.mrt6s_upq_sockfull++;
1155 FREE(rte, M_MRTABLE);
1156 m_freem(mb0);
1157 FREE(rt, M_MRTABLE);
1158 return ENOBUFS;
1159 }
1160
1161 mrt6stat.mrt6s_upcalls++;
1162
1163 /* insert new entry at head of hash chain */
1164 bzero(rt, sizeof(*rt));
1165 rt->mf6c_origin.sin6_family = AF_INET6;
1166 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1167 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1168 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1169 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1170 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1171 rt->mf6c_expire = UPCALL_EXPIRE;
1172 n6expire[hash]++;
1173 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1174
1175 /* link into table */
1176 rt->mf6c_next = mf6ctable[hash];
1177 mf6ctable[hash] = rt;
1178 /* Add this entry to the end of the queue */
1179 rt->mf6c_stall = rte;
1180 } else {
1181 /* determine if q has overflowed */
1182 struct rtdetq **p;
1183 int npkts = 0;
1184
1185 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1186 if (++npkts > MAX_UPQ6) {
1187 mrt6stat.mrt6s_upq_ovflw++;
1188 FREE(rte, M_MRTABLE);
1189 m_freem(mb0);
1190 return 0;
1191 }
1192
1193 /* Add this entry to the end of the queue */
1194 *p = rte;
1195 }
1196
1197 rte->next = NULL;
1198 rte->m = mb0;
1199 rte->ifp = ifp;
1200 #if UPCALL_TIMING
1201 rte->t = tp;
1202 #endif /* UPCALL_TIMING */
1203
1204
1205 return 0;
1206 }
1207 }
1208
1209 /*
1210 * Clean up cache entries if upcalls are not serviced
1211 * Call from the Slow Timeout mechanism, every half second.
1212 */
1213 static void
1214 expire_upcalls(
1215 __unused void *unused)
1216 {
1217 struct rtdetq *rte;
1218 struct mf6c *mfc, **nptr;
1219 int i;
1220
1221 for (i = 0; i < MF6CTBLSIZ; i++) {
1222 if (n6expire[i] == 0)
1223 continue;
1224 nptr = &mf6ctable[i];
1225 while ((mfc = *nptr) != NULL) {
1226 rte = mfc->mf6c_stall;
1227 /*
1228 * Skip real cache entries
1229 * Make sure it wasn't marked to not expire (shouldn't happen)
1230 * If it expires now
1231 */
1232 if (rte != NULL &&
1233 mfc->mf6c_expire != 0 &&
1234 --mfc->mf6c_expire == 0) {
1235 #if MRT6DEBUG
1236 if (mrt6debug & DEBUG_EXPIRE)
1237 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1238 ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
1239 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
1240 #endif
1241 /*
1242 * drop all the packets
1243 * free the mbuf with the pkt, if, timing info
1244 */
1245 do {
1246 struct rtdetq *n = rte->next;
1247 m_freem(rte->m);
1248 FREE(rte, M_MRTABLE);
1249 rte = n;
1250 } while (rte != NULL);
1251 mrt6stat.mrt6s_cache_cleanups++;
1252 n6expire[i]--;
1253
1254 *nptr = mfc->mf6c_next;
1255 FREE(mfc, M_MRTABLE);
1256 } else {
1257 nptr = &mfc->mf6c_next;
1258 }
1259 }
1260 }
1261
1262 #ifndef __APPLE__
1263 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1264 expire_upcalls, NULL);
1265 #else
1266 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
1267 #endif
1268 }
1269
1270 /*
1271 * Packet forwarding routine once entry in the cache is made
1272 */
1273 static int
1274 ip6_mdq(m, ifp, rt)
1275 struct mbuf *m;
1276 struct ifnet *ifp;
1277 struct mf6c *rt;
1278 {
1279 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1280 mifi_t mifi, iif;
1281 struct mif6 *mifp;
1282 int plen = m->m_pkthdr.len;
1283
1284 /*
1285 * Macro to send packet on mif. Since RSVP packets don't get counted on
1286 * input, they shouldn't get counted on output, so statistics keeping is
1287 * separate.
1288 */
1289
1290 #define MC6_SEND(ip6, mifp, m) do { \
1291 if ((mifp)->m6_flags & MIFF_REGISTER) \
1292 register_send((ip6), (mifp), (m)); \
1293 else \
1294 phyint_send((ip6), (mifp), (m)); \
1295 } while (0)
1296
1297 /*
1298 * Don't forward if it didn't arrive from the parent mif
1299 * for its origin.
1300 */
1301 mifi = rt->mf6c_parent;
1302 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1303 /* came in the wrong interface */
1304 #if MRT6DEBUG
1305 if (mrt6debug & DEBUG_FORWARD)
1306 log(LOG_DEBUG,
1307 "wrong if: ifid %d mifi %d mififid %x\n",
1308 ifp->if_index, mifi,
1309 mif6table[mifi].m6_ifp->if_index);
1310 #endif
1311 mrt6stat.mrt6s_wrong_if++;
1312 rt->mf6c_wrong_if++;
1313 /*
1314 * If we are doing PIM processing, and we are forwarding
1315 * packets on this interface, send a message to the
1316 * routing daemon.
1317 */
1318 /* have to make sure this is a valid mif */
1319 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1320 if (pim6 && (m->m_flags & M_LOOP) == 0) {
1321 /*
1322 * Check the M_LOOP flag to avoid an
1323 * unnecessary PIM assert.
1324 * XXX: M_LOOP is an ad-hoc hack...
1325 */
1326 static struct sockaddr_in6 addr =
1327 { sizeof(addr), AF_INET6 , 0, 0, IN6ADDR_ANY_INIT, 0};
1328
1329 struct mbuf *mm;
1330 struct mrt6msg *im;
1331 #if MRT6_OINIT
1332 struct omrt6msg *oim;
1333 #endif
1334
1335 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1336 if (mm &&
1337 (M_HASCL(mm) ||
1338 mm->m_len < sizeof(struct ip6_hdr)))
1339 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1340 if (mm == NULL)
1341 return ENOBUFS;
1342
1343 #if MRT6_OINIT
1344 oim = NULL;
1345 #endif
1346 im = NULL;
1347 switch (ip6_mrouter_ver) {
1348 #if MRT6_OINIT
1349 case MRT6_OINIT:
1350 oim = mtod(mm, struct omrt6msg *);
1351 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1352 oim->im6_mbz = 0;
1353 break;
1354 #endif
1355 case MRT6_INIT:
1356 im = mtod(mm, struct mrt6msg *);
1357 im->im6_msgtype = MRT6MSG_WRONGMIF;
1358 im->im6_mbz = 0;
1359 break;
1360 default:
1361 m_freem(mm);
1362 return EINVAL;
1363 }
1364
1365 for (mifp = mif6table, iif = 0;
1366 iif < nummifs && mifp &&
1367 mifp->m6_ifp != ifp;
1368 mifp++, iif++)
1369 ;
1370
1371 switch (ip6_mrouter_ver) {
1372 #if MRT6_OINIT
1373 case MRT6_OINIT:
1374 oim->im6_mif = iif;
1375 addr.sin6_addr = oim->im6_src;
1376 break;
1377 #endif
1378 case MRT6_INIT:
1379 im->im6_mif = iif;
1380 addr.sin6_addr = im->im6_src;
1381 break;
1382 }
1383
1384 mrt6stat.mrt6s_upcalls++;
1385
1386 if (socket_send(ip6_mrouter, mm, &addr) < 0) {
1387 #if MRT6DEBUG
1388 if (mrt6debug)
1389 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1390 #endif
1391 ++mrt6stat.mrt6s_upq_sockfull;
1392 return ENOBUFS;
1393 } /* if socket Q full */
1394 } /* if PIM */
1395 return 0;
1396 } /* if wrong iif */
1397
1398 /* If I sourced this packet, it counts as output, else it was input. */
1399 if (m->m_pkthdr.rcvif == NULL) {
1400 /* XXX: is rcvif really NULL when output?? */
1401 mif6table[mifi].m6_pkt_out++;
1402 mif6table[mifi].m6_bytes_out += plen;
1403 } else {
1404 mif6table[mifi].m6_pkt_in++;
1405 mif6table[mifi].m6_bytes_in += plen;
1406 }
1407 rt->mf6c_pkt_cnt++;
1408 rt->mf6c_byte_cnt += plen;
1409
1410 /*
1411 * For each mif, forward a copy of the packet if there are group
1412 * members downstream on the interface.
1413 */
1414 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++)
1415 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1416 /*
1417 * check if the outgoing packet is going to break
1418 * a scope boundary.
1419 * XXX For packets through PIM register tunnel
1420 * interface, we believe a routing daemon.
1421 */
1422 if ((mif6table[rt->mf6c_parent].m6_flags &
1423 MIFF_REGISTER) == 0 &&
1424 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 &&
1425 (in6_addr2scopeid(ifp, &ip6->ip6_dst) !=
1426 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1427 &ip6->ip6_dst) ||
1428 in6_addr2scopeid(ifp, &ip6->ip6_src) !=
1429 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1430 &ip6->ip6_src))) {
1431 ip6stat.ip6s_badscope++;
1432 continue;
1433 }
1434
1435 mifp->m6_pkt_out++;
1436 mifp->m6_bytes_out += plen;
1437 MC6_SEND(ip6, mifp, m);
1438 }
1439 return 0;
1440 }
1441
1442 static void
1443 phyint_send(ip6, mifp, m)
1444 struct ip6_hdr *ip6;
1445 struct mif6 *mifp;
1446 struct mbuf *m;
1447 {
1448 struct mbuf *mb_copy;
1449 struct ifnet *ifp = mifp->m6_ifp;
1450 int error = 0;
1451 static struct route_in6 ro;
1452 struct in6_multi *in6m;
1453 struct sockaddr_in6 *dst6;
1454
1455 /*
1456 * Make a new reference to the packet; make sure that
1457 * the IPv6 header is actually copied, not just referenced,
1458 * so that ip6_output() only scribbles on the copy.
1459 */
1460 mb_copy = m_copy(m, 0, M_COPYALL);
1461 if (mb_copy &&
1462 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1463 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1464 if (mb_copy == NULL) {
1465 return;
1466 }
1467 /* set MCAST flag to the outgoing packet */
1468 mb_copy->m_flags |= M_MCAST;
1469
1470 /*
1471 * If we sourced the packet, call ip6_output since we may devide
1472 * the packet into fragments when the packet is too big for the
1473 * outgoing interface.
1474 * Otherwise, we can simply send the packet to the interface
1475 * sending queue.
1476 */
1477 if (m->m_pkthdr.rcvif == NULL) {
1478 struct ip6_moptions im6o;
1479
1480 im6o.im6o_multicast_ifp = ifp;
1481 /* XXX: ip6_output will override ip6->ip6_hlim */
1482 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1483 im6o.im6o_multicast_loop = 1;
1484 error = ip6_output(mb_copy, NULL, &ro,
1485 IPV6_FORWARDING, &im6o, NULL, 0);
1486
1487
1488 #if MRT6DEBUG
1489 if (mrt6debug & DEBUG_XMIT)
1490 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1491 mifp - mif6table, error);
1492 #endif
1493 return;
1494 }
1495
1496 /*
1497 * If we belong to the destination multicast group
1498 * on the outgoing interface, loop back a copy.
1499 */
1500 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
1501 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1502 if (in6m != NULL) {
1503 dst6->sin6_len = sizeof(struct sockaddr_in6);
1504 dst6->sin6_family = AF_INET6;
1505 dst6->sin6_addr = ip6->ip6_dst;
1506 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
1507 }
1508 /*
1509 * Put the packet into the sending queue of the outgoing interface
1510 * if it would fit in the MTU of the interface.
1511 */
1512 if (mb_copy->m_pkthdr.len <= ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) {
1513 dst6->sin6_len = sizeof(struct sockaddr_in6);
1514 dst6->sin6_family = AF_INET6;
1515 dst6->sin6_addr = ip6->ip6_dst;
1516 /*
1517 * We just call if_output instead of nd6_output here, since
1518 * we need no ND for a multicast forwarded packet...right?
1519 */
1520 #ifdef __APPLE__
1521 /* Make sure the HW checksum flags are cleaned before sending the packet */
1522
1523 mb_copy->m_pkthdr.rcvif = 0;
1524 mb_copy->m_pkthdr.csum_data = 0;
1525 mb_copy->m_pkthdr.csum_flags = 0;
1526
1527 lck_mtx_unlock(ip6_mutex);
1528 error = dlil_output(ifp, PF_INET6, mb_copy,
1529 NULL, (struct sockaddr *)&ro.ro_dst, 0);
1530 lck_mtx_lock(ip6_mutex);
1531 #else
1532 error = (*ifp->if_output)(ifp, mb_copy,
1533 (struct sockaddr *)&ro.ro_dst,
1534 NULL);
1535 #endif
1536 #if MRT6DEBUG
1537 if (mrt6debug & DEBUG_XMIT)
1538 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1539 mifp - mif6table, error);
1540 #endif
1541 } else {
1542 #if MULTICAST_PMTUD
1543 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
1544 #else
1545 #if MRT6DEBUG
1546 if (mrt6debug & DEBUG_XMIT)
1547 log(LOG_DEBUG,
1548 "phyint_send: packet too big on %s o %s g %s"
1549 " size %d(discarded)\n",
1550 if_name(ifp),
1551 ip6_sprintf(&ip6->ip6_src),
1552 ip6_sprintf(&ip6->ip6_dst),
1553 mb_copy->m_pkthdr.len);
1554 #endif /* MRT6DEBUG */
1555 m_freem(mb_copy); /* simply discard the packet */
1556 #endif
1557 }
1558 }
1559
1560 static int
1561 register_send(ip6, mif, m)
1562 struct ip6_hdr *ip6;
1563 struct mif6 *mif;
1564 struct mbuf *m;
1565 {
1566 struct mbuf *mm;
1567 int i, len = m->m_pkthdr.len;
1568 static struct sockaddr_in6 addr = { sizeof(addr), AF_INET6 ,
1569 0, 0, IN6ADDR_ANY_INIT, 0};
1570 struct mrt6msg *im6;
1571
1572 #if MRT6DEBUG
1573 if (mrt6debug)
1574 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1575 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
1576 #endif
1577 ++pim6stat.pim6s_snd_registers;
1578
1579 /* Make a copy of the packet to send to the user level process */
1580 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1581 if (mm == NULL)
1582 return ENOBUFS;
1583 #ifdef __darwin8_notyet
1584 #if CONFIG_MACF_NET
1585 mac_create_mbuf_multicast_encap(m, mif->m6_ifp, mm);
1586 #endif
1587 #endif
1588 mm->m_pkthdr.rcvif = NULL;
1589 mm->m_data += max_linkhdr;
1590 mm->m_len = sizeof(struct ip6_hdr);
1591
1592 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1593 m_freem(mm);
1594 return ENOBUFS;
1595 }
1596 i = MHLEN - M_LEADINGSPACE(mm);
1597 if (i > len)
1598 i = len;
1599 mm = m_pullup(mm, i);
1600 if (mm == NULL){
1601 m_freem(mm);
1602 return ENOBUFS;
1603 }
1604 /* TODO: check it! */
1605 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1606
1607 /*
1608 * Send message to routing daemon
1609 */
1610 addr.sin6_addr = ip6->ip6_src;
1611
1612 im6 = mtod(mm, struct mrt6msg *);
1613 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1614 im6->im6_mbz = 0;
1615
1616 im6->im6_mif = mif - mif6table;
1617
1618 /* iif info is not given for reg. encap.n */
1619 mrt6stat.mrt6s_upcalls++;
1620
1621 if (socket_send(ip6_mrouter, mm, &addr) < 0) {
1622 #if MRT6DEBUG
1623 if (mrt6debug)
1624 log(LOG_WARNING,
1625 "register_send: ip6_mrouter socket queue full\n");
1626 #endif
1627 ++mrt6stat.mrt6s_upq_sockfull;
1628 return ENOBUFS;
1629 }
1630 return 0;
1631 }
1632
1633 /*
1634 * PIM sparse mode hook
1635 * Receives the pim control messages, and passes them up to the listening
1636 * socket, using rip6_input.
1637 * The only message processed is the REGISTER pim message; the pim header
1638 * is stripped off, and the inner packet is passed to register_mforward.
1639 */
1640 int
1641 pim6_input(mp, offp)
1642 struct mbuf **mp;
1643 int *offp;
1644 {
1645 struct pim *pim; /* pointer to a pim struct */
1646 struct ip6_hdr *ip6;
1647 int pimlen;
1648 struct mbuf *m = *mp;
1649 int minlen;
1650 int off = *offp;
1651 int proto;
1652
1653 ++pim6stat.pim6s_rcv_total;
1654
1655 ip6 = mtod(m, struct ip6_hdr *);
1656 pimlen = m->m_pkthdr.len - *offp;
1657 proto = ip6->ip6_nxt;
1658
1659 /*
1660 * Validate lengths
1661 */
1662 if (pimlen < PIM_MINLEN) {
1663 ++pim6stat.pim6s_rcv_tooshort;
1664 #if MRT6DEBUG
1665 if (mrt6debug & DEBUG_PIM)
1666 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1667 #endif
1668 m_freem(m);
1669 return(IPPROTO_DONE);
1670 }
1671
1672 /*
1673 * if the packet is at least as big as a REGISTER, go ahead
1674 * and grab the PIM REGISTER header size, to avoid another
1675 * possible m_pullup() later.
1676 *
1677 * PIM_MINLEN == pimhdr + u_int32 == 8
1678 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1679 */
1680 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1681
1682 /*
1683 * Make sure that the IP6 and PIM headers in contiguous memory, and
1684 * possibly the PIM REGISTER header
1685 */
1686 #ifndef PULLDOWN_TEST
1687 IP6_EXTHDR_CHECK(m, off, minlen, return IPPROTO_DONE);
1688 /* adjust pointer */
1689 ip6 = mtod(m, struct ip6_hdr *);
1690
1691 /* adjust mbuf to point to the PIM header */
1692 pim = (struct pim *)((caddr_t)ip6 + off);
1693 #else
1694 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1695 if (pim == NULL) {
1696 pim6stat.pim6s_rcv_tooshort++;
1697 return IPPROTO_DONE;
1698 }
1699 #endif
1700
1701 #define PIM6_CHECKSUM
1702 #ifdef PIM6_CHECKSUM
1703 {
1704 int cksumlen;
1705
1706 /*
1707 * Validate checksum.
1708 * If PIM REGISTER, exclude the data packet
1709 */
1710 if (pim->pim_type == PIM_REGISTER)
1711 cksumlen = PIM_MINLEN;
1712 else
1713 cksumlen = pimlen;
1714
1715 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1716 ++pim6stat.pim6s_rcv_badsum;
1717 #if MRT6DEBUG
1718 if (mrt6debug & DEBUG_PIM)
1719 log(LOG_DEBUG,
1720 "pim6_input: invalid checksum\n");
1721 #endif
1722 m_freem(m);
1723 return(IPPROTO_DONE);
1724 }
1725 }
1726 #endif /* PIM_CHECKSUM */
1727
1728 /* PIM version check */
1729 if (pim->pim_ver != PIM_VERSION) {
1730 ++pim6stat.pim6s_rcv_badversion;
1731 #if MRT6DEBUG
1732 log(LOG_ERR,
1733 "pim6_input: incorrect version %d, expecting %d\n",
1734 pim->pim_ver, PIM_VERSION);
1735 #endif
1736 m_freem(m);
1737 return(IPPROTO_DONE);
1738 }
1739
1740 if (pim->pim_type == PIM_REGISTER) {
1741 /*
1742 * since this is a REGISTER, we'll make a copy of the register
1743 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1744 * routing daemon.
1745 */
1746 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 ,
1747 0, 0, IN6ADDR_ANY_INIT, 0 };
1748
1749 struct mbuf *mcp;
1750 struct ip6_hdr *eip6;
1751 u_int32_t *reghdr;
1752
1753 ++pim6stat.pim6s_rcv_registers;
1754
1755 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1756 #if MRT6DEBUG
1757 if (mrt6debug & DEBUG_PIM)
1758 log(LOG_DEBUG,
1759 "pim6_input: register mif not set: %d\n",
1760 reg_mif_num);
1761 #endif
1762 m_freem(m);
1763 return(IPPROTO_DONE);
1764 }
1765
1766 reghdr = (u_int32_t *)(pim + 1);
1767
1768 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1769 goto pim6_input_to_daemon;
1770
1771 /*
1772 * Validate length
1773 */
1774 if (pimlen < PIM6_REG_MINLEN) {
1775 ++pim6stat.pim6s_rcv_tooshort;
1776 ++pim6stat.pim6s_rcv_badregisters;
1777 #if MRT6DEBUG
1778 log(LOG_ERR,
1779 "pim6_input: register packet size too "
1780 "small %d from %s\n",
1781 pimlen, ip6_sprintf(&ip6->ip6_src));
1782 #endif
1783 m_freem(m);
1784 return(IPPROTO_DONE);
1785 }
1786
1787 eip6 = (struct ip6_hdr *) (reghdr + 1);
1788 #if MRT6DEBUG
1789 if (mrt6debug & DEBUG_PIM)
1790 log(LOG_DEBUG,
1791 "pim6_input[register], eip6: %s -> %s, "
1792 "eip6 plen %d\n",
1793 ip6_sprintf(&eip6->ip6_src),
1794 ip6_sprintf(&eip6->ip6_dst),
1795 ntohs(eip6->ip6_plen));
1796 #endif
1797
1798 /* verify the version number of the inner packet */
1799 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1800 ++pim6stat.pim6s_rcv_badregisters;
1801 #if MRT6DEBUG
1802 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1803 "of the inner packet\n",
1804 (eip6->ip6_vfc & IPV6_VERSION));
1805 #endif
1806 m_freem(m);
1807 return(IPPROTO_NONE);
1808 }
1809
1810 /* verify the inner packet is destined to a mcast group */
1811 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1812 ++pim6stat.pim6s_rcv_badregisters;
1813 #if MRT6DEBUG
1814 if (mrt6debug & DEBUG_PIM)
1815 log(LOG_DEBUG,
1816 "pim6_input: inner packet of register "
1817 "is not multicast %s\n",
1818 ip6_sprintf(&eip6->ip6_dst));
1819 #endif
1820 m_freem(m);
1821 return(IPPROTO_DONE);
1822 }
1823
1824 /*
1825 * make a copy of the whole header to pass to the daemon later.
1826 */
1827 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1828 if (mcp == NULL) {
1829 #if MRT6DEBUG
1830 log(LOG_ERR,
1831 "pim6_input: pim register: "
1832 "could not copy register head\n");
1833 #endif
1834 m_freem(m);
1835 return(IPPROTO_DONE);
1836 }
1837
1838 /*
1839 * forward the inner ip6 packet; point m_data at the inner ip6.
1840 */
1841 m_adj(m, off + PIM_MINLEN);
1842 #if MRT6DEBUG
1843 if (mrt6debug & DEBUG_PIM) {
1844 log(LOG_DEBUG,
1845 "pim6_input: forwarding decapsulated register: "
1846 "src %s, dst %s, mif %d\n",
1847 ip6_sprintf(&eip6->ip6_src),
1848 ip6_sprintf(&eip6->ip6_dst),
1849 reg_mif_num);
1850 }
1851 #endif
1852
1853 #ifdef __APPLE__
1854
1855 if (lo_ifp) {
1856 lck_mtx_unlock(ip6_mutex);
1857 dlil_output(lo_ifp, PF_INET6, m, 0, (struct sockaddr *)&dst, 0);
1858 lck_mtx_lock(ip6_mutex);
1859 }
1860 else {
1861 printf("Warning: pim6_input call to dlil_find_dltag failed!\n");
1862 m_freem(m);
1863 }
1864 #else
1865 (void) if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1866 dst.sin6_family, NULL);
1867 #endif
1868
1869 /* prepare the register head to send to the mrouting daemon */
1870 m = mcp;
1871 }
1872
1873 /*
1874 * Pass the PIM message up to the daemon; if it is a register message
1875 * pass the 'head' only up to the daemon. This includes the
1876 * encapsulator ip6 header, pim header, register header and the
1877 * encapsulated ip6 header.
1878 */
1879 pim6_input_to_daemon:
1880 rip6_input(&m, offp);
1881 return(IPPROTO_DONE);
1882 }
mirror of XNU