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1 /*
2 * Copyright (c) 2003-2008 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
139 #if MROUTING
140
141 struct mrt6stat mrt6stat;
142
143 #define NO_RTE_FOUND 0x1
144 #define RTE_FOUND 0x2
145
146 struct mf6c *mf6ctable[MF6CTBLSIZ];
147 u_char n6expire[MF6CTBLSIZ];
148 static struct mif6 mif6table[MAXMIFS];
149 #if MRT6DEBUG
150 u_int mrt6debug = 0; /* debug level */
151 #define DEBUG_MFC 0x02
152 #define DEBUG_FORWARD 0x04
153 #define DEBUG_EXPIRE 0x08
154 #define DEBUG_XMIT 0x10
155 #define DEBUG_REG 0x20
156 #define DEBUG_PIM 0x40
157 #endif
158
159 static void expire_upcalls(void *);
160
161 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
162 #define UPCALL_EXPIRE 6 /* number of timeouts */
163
164 #if INET
165 #if MROUTING
166 extern struct socket *ip_mrouter;
167 #endif
168 #endif
169
170 /*
171 * 'Interfaces' associated with decapsulator (so we can tell
172 * packets that went through it from ones that get reflected
173 * by a broken gateway). These interfaces are never linked into
174 * the system ifnet list & no routes point to them. I.e., packets
175 * can't be sent this way. They only exist as a placeholder for
176 * multicast source verification.
177 */
178 struct ifnet multicast_register_if;
179
180 #define ENCAP_HOPS 64
181
182 /*
183 * Private variables.
184 */
185 static mifi_t nummifs = 0;
186 static mifi_t reg_mif_num = (mifi_t)-1;
187
188 static struct pim6stat pim6stat;
189 static int pim6;
190
191 /*
192 * Hash function for a source, group entry
193 */
194 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
195 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
196 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
197 (g).s6_addr32[2] ^ (g).s6_addr32[3])
198
199 /*
200 * Find a route for a given origin IPv6 address and Multicast group address.
201 * Quality of service parameter to be added in the future!!!
202 */
203
204 #define MF6CFIND(o, g, rt) do { \
205 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
206 rt = NULL; \
207 mrt6stat.mrt6s_mfc_lookups++; \
208 while (_rt) { \
209 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
210 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
211 (_rt->mf6c_stall == NULL)) { \
212 rt = _rt; \
213 break; \
214 } \
215 _rt = _rt->mf6c_next; \
216 } \
217 if (rt == NULL) { \
218 mrt6stat.mrt6s_mfc_misses++; \
219 } \
220 } while (0)
221
222 /*
223 * Macros to compute elapsed time efficiently
224 * Borrowed from Van Jacobson's scheduling code
225 */
226 #define TV_DELTA(a, b, delta) do { \
227 int xxs; \
228 \
229 delta = (a).tv_usec - (b).tv_usec; \
230 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
231 switch (xxs) { \
232 case 2: \
233 delta += 1000000; \
234 /* fall through */ \
235 case 1: \
236 delta += 1000000; \
237 break; \
238 default: \
239 delta += (1000000 * xxs); \
240 } \
241 } \
242 } while (0)
243
244 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
245 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
246
247 #if UPCALL_TIMING
248 #define UPCALL_MAX 50
249 u_int32_t upcall_data[UPCALL_MAX + 1];
250 static void collate();
251 #endif /* UPCALL_TIMING */
252
253 static int get_sg_cnt(struct sioc_sg_req6 *);
254 static int get_mif6_cnt(void *, int);
255 static int ip6_mrouter_init(struct socket *, int, int);
256 static int add_m6if(struct mif6ctl *);
257 static int del_m6if(mifi_t *);
258 static int add_m6fc(struct mf6cctl *);
259 static int del_m6fc(struct mf6cctl *);
260
261 #ifndef __APPLE__
262 static struct callout expire_upcalls_ch;
263 #endif
264 /*
265 * Handle MRT setsockopt commands to modify the multicast routing tables.
266 */
267 int
268 ip6_mrouter_set(so, sopt)
269 struct socket *so;
270 struct sockopt *sopt;
271 {
272 int error = 0;
273 int optval;
274 struct mif6ctl mifc;
275 struct mf6cctl mfcc;
276 mifi_t mifi;
277
278 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
279 return (EACCES);
280
281 switch (sopt->sopt_name) {
282 case MRT6_INIT:
283 #if MRT6_OINIT
284 case MRT6_OINIT:
285 #endif
286 error = sooptcopyin(sopt, &optval, sizeof(optval),
287 sizeof(optval));
288 if (error)
289 break;
290 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
291 break;
292 case MRT6_DONE:
293 error = ip6_mrouter_done();
294 break;
295 case MRT6_ADD_MIF:
296 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
297 if (error)
298 break;
299 error = add_m6if(&mifc);
300 break;
301 case MRT6_ADD_MFC:
302 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
303 if (error)
304 break;
305 error = add_m6fc(&mfcc);
306 break;
307 case MRT6_DEL_MFC:
308 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
309 if (error)
310 break;
311 error = del_m6fc(&mfcc);
312 break;
313 case MRT6_DEL_MIF:
314 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
315 if (error)
316 break;
317 error = del_m6if(&mifi);
318 break;
319 case MRT6_PIM:
320 error = sooptcopyin(sopt, &optval, sizeof(optval),
321 sizeof(optval));
322 if (error)
323 break;
324 error = set_pim6(&optval);
325 break;
326 default:
327 error = EOPNOTSUPP;
328 break;
329 }
330
331 return (error);
332 }
333
334 /*
335 * Handle MRT getsockopt commands
336 */
337 int
338 ip6_mrouter_get(so, sopt)
339 struct socket *so;
340 struct sockopt *sopt;
341 {
342 int error = 0;
343
344 if (so != ip6_mrouter) return EACCES;
345
346 switch (sopt->sopt_name) {
347 case MRT6_PIM:
348 error = sooptcopyout(sopt, &pim6, sizeof(pim6));
349 break;
350 }
351 return (error);
352 }
353
354 /*
355 * Handle ioctl commands to obtain information from the cache
356 */
357 int
358 mrt6_ioctl(u_long cmd, caddr_t data)
359 {
360 int error = 0;
361
362 switch (cmd) {
363 case SIOCGETSGCNT_IN6:
364 return (get_sg_cnt((struct sioc_sg_req6 *)data));
365 /* NOTREACHED */
366
367 case SIOCGETMIFCNT_IN6_32:
368 case SIOCGETMIFCNT_IN6_64:
369 return (get_mif6_cnt(data, cmd == SIOCGETMIFCNT_IN6_64));
370 /* NOTREACHED */
371
372 default:
373 error = EINVAL;
374 break;
375 }
376 return (error);
377 }
378
379 /*
380 * returns the packet, byte, rpf-failure count for the source group provided
381 */
382 static int
383 get_sg_cnt(req)
384 struct sioc_sg_req6 *req;
385 {
386 struct mf6c *rt;
387
388 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
389 if (rt != NULL) {
390 req->pktcnt = rt->mf6c_pkt_cnt;
391 req->bytecnt = rt->mf6c_byte_cnt;
392 req->wrong_if = rt->mf6c_wrong_if;
393 } else
394 return(ESRCH);
395 #if 0
396 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
397 #endif
398
399 return 0;
400 }
401
402 /*
403 * returns the input and output packet and byte counts on the mif provided
404 */
405 static int
406 get_mif6_cnt(void *data, int p64)
407 {
408 if (p64) {
409 struct sioc_mif_req6_64 *req = data;
410
411 mifi_t mifi = req->mifi;
412
413 if (mifi >= nummifs)
414 return (EINVAL);
415
416 req->icount = mif6table[mifi].m6_pkt_in;
417 req->ocount = mif6table[mifi].m6_pkt_out;
418 req->ibytes = mif6table[mifi].m6_bytes_in;
419 req->obytes = mif6table[mifi].m6_bytes_out;
420 } else {
421 struct sioc_mif_req6_32 *req = data;
422
423 mifi_t mifi = req->mifi;
424
425 if (mifi >= nummifs)
426 return (EINVAL);
427
428 req->icount = mif6table[mifi].m6_pkt_in;
429 req->ocount = mif6table[mifi].m6_pkt_out;
430 req->ibytes = mif6table[mifi].m6_bytes_in;
431 req->obytes = mif6table[mifi].m6_bytes_out;
432 }
433 return (0);
434 }
435
436 static int
437 set_pim6(i)
438 int *i;
439 {
440 if ((*i != 1) && (*i != 0))
441 return EINVAL;
442
443 pim6 = *i;
444
445 return 0;
446 }
447
448 /*
449 * Enable multicast routing
450 */
451 static int
452 ip6_mrouter_init(so, v, cmd)
453 struct socket *so;
454 int v;
455 int cmd;
456 {
457 #if MRT6DEBUG
458 if (mrt6debug)
459 log(LOG_DEBUG,
460 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
461 so->so_type, so->so_proto->pr_protocol);
462 #endif
463
464 if (so->so_type != SOCK_RAW ||
465 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
466 return EOPNOTSUPP;
467
468 if (v != 1)
469 return (ENOPROTOOPT);
470
471 if (ip6_mrouter != NULL) return EADDRINUSE;
472
473 ip6_mrouter = so;
474 ip6_mrouter_ver = cmd;
475
476 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
477 bzero((caddr_t)n6expire, sizeof(n6expire));
478
479 pim6 = 0;/* used for stubbing out/in pim stuff */
480
481 #ifndef __APPLE__
482 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
483 expire_upcalls, NULL);
484 #else
485 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
486 #endif
487
488 #if MRT6DEBUG
489 if (mrt6debug)
490 log(LOG_DEBUG, "ip6_mrouter_init\n");
491 #endif
492
493 return 0;
494 }
495
496 /*
497 * Disable multicast routing
498 */
499 int
500 ip6_mrouter_done()
501 {
502 mifi_t mifi;
503 int i;
504 struct mf6c *rt;
505 struct rtdetq *rte;
506
507
508 /*
509 * For each phyint in use, disable promiscuous reception of all IPv6
510 * multicasts.
511 */
512 #if INET
513 #if MROUTING
514 /*
515 * If there is still IPv4 multicast routing daemon,
516 * we remain interfaces to receive all muliticasted packets.
517 * XXX: there may be an interface in which the IPv4 multicast
518 * daemon is not interested...
519 */
520 if (!ip_mrouter)
521 #endif
522 #endif
523 {
524 for (mifi = 0; mifi < nummifs; mifi++) {
525 if (mif6table[mifi].m6_ifp &&
526 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
527 #ifdef __APPLE__
528 if_allmulti(mif6table[mifi].m6_ifp, 0);
529 #else
530 {
531 struct ifnet *ifp;
532 struct in6_ifreq ifr;
533
534 ifr.ifr_addr.sin6_family = AF_INET6;
535 ifr.ifr_addr.sin6_addr= in6addr_any;
536 ifp = mif6table[mifi].m6_ifp;
537 ifnet_ioctl(ifp, 0, SIOCDELMULTI, &ifr);
538 }
539 #endif
540 }
541 }
542 }
543 #if notyet
544 bzero((caddr_t)qtable, sizeof(qtable));
545 bzero((caddr_t)tbftable, sizeof(tbftable));
546 #endif
547 bzero((caddr_t)mif6table, sizeof(mif6table));
548 nummifs = 0;
549
550 pim6 = 0; /* used to stub out/in pim specific code */
551
552 #ifndef __APPLE__
553 callout_stop(&expire_upcalls_ch);
554 #else
555 untimeout(expire_upcalls, (caddr_t)NULL);
556 #endif
557
558 /*
559 * Free all multicast forwarding cache entries.
560 *###LD 5/27 needs locking
561 */
562 for (i = 0; i < MF6CTBLSIZ; i++) {
563 rt = mf6ctable[i];
564 while (rt) {
565 struct mf6c *frt;
566
567 for (rte = rt->mf6c_stall; rte != NULL; ) {
568 struct rtdetq *n = rte->next;
569
570 m_free(rte->m);
571 FREE(rte, M_MRTABLE);
572 rte = n;
573 }
574 frt = rt;
575 rt = rt->mf6c_next;
576 FREE(frt, M_MRTABLE);
577 }
578 }
579
580 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
581
582 /*
583 * Reset de-encapsulation cache
584 */
585 reg_mif_num = -1;
586
587 ip6_mrouter = NULL;
588 ip6_mrouter_ver = 0;
589
590
591 #if MRT6DEBUG
592 if (mrt6debug)
593 log(LOG_DEBUG, "ip6_mrouter_done\n");
594 #endif
595
596 return 0;
597 }
598
599 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 ,
600 0, 0, IN6ADDR_ANY_INIT, 0};
601
602 /*
603 * Add a mif to the mif table
604 */
605 static int
606 add_m6if(mifcp)
607 struct mif6ctl *mifcp;
608 {
609 struct mif6 *mifp;
610 struct ifnet *ifp;
611 int error;
612 #if notyet
613 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
614 #endif
615
616 if (mifcp->mif6c_mifi >= MAXMIFS)
617 return EINVAL;
618 mifp = mif6table + mifcp->mif6c_mifi;
619 if (mifp->m6_ifp)
620 return EADDRINUSE; /* XXX: is it appropriate? */
621
622 ifnet_head_lock_shared();
623 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index) {
624 ifnet_head_done();
625 return ENXIO;
626 }
627 ifp = ifindex2ifnet[mifcp->mif6c_pifi];
628 ifnet_head_done();
629
630 if (ifp == NULL) {
631 return ENXIO;
632 }
633 if (mifcp->mif6c_flags & MIFF_REGISTER) {
634 if (reg_mif_num == (mifi_t)-1) {
635 multicast_register_if.if_name = "register_mif";
636 multicast_register_if.if_flags |= IFF_LOOPBACK;
637 multicast_register_if.if_index = mifcp->mif6c_mifi;
638 reg_mif_num = mifcp->mif6c_mifi;
639 }
640
641 ifp = &multicast_register_if;
642
643 } /* if REGISTER */
644 else {
645 /* Make sure the interface supports multicast */
646 if ((ifp->if_flags & IFF_MULTICAST) == 0)
647 return EOPNOTSUPP;
648
649 error = if_allmulti(ifp, 1);
650 if (error)
651 return error;
652 }
653
654 mifp->m6_flags = mifcp->mif6c_flags;
655 mifp->m6_ifp = ifp;
656 #if notyet
657 /* scaling up here allows division by 1024 in critical code */
658 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
659 #endif
660 /* initialize per mif pkt counters */
661 mifp->m6_pkt_in = 0;
662 mifp->m6_pkt_out = 0;
663 mifp->m6_bytes_in = 0;
664 mifp->m6_bytes_out = 0;
665
666 /* Adjust nummifs up if the mifi is higher than nummifs */
667 if (nummifs <= mifcp->mif6c_mifi)
668 nummifs = mifcp->mif6c_mifi + 1;
669
670 #if MRT6DEBUG
671 if (mrt6debug)
672 log(LOG_DEBUG,
673 "add_mif #%d, phyint %s%d\n",
674 mifcp->mif6c_mifi,
675 ifp->if_name, ifp->if_unit);
676 #endif
677
678 return 0;
679 }
680
681 /*
682 * Delete a mif from the mif table
683 */
684 static int
685 del_m6if(mifip)
686 mifi_t *mifip;
687 {
688 struct mif6 *mifp = mif6table + *mifip;
689 mifi_t mifi;
690 struct ifnet *ifp;
691
692 if (*mifip >= nummifs)
693 return EINVAL;
694 if (mifp->m6_ifp == NULL)
695 return EINVAL;
696
697
698 if (!(mifp->m6_flags & MIFF_REGISTER)) {
699 /*
700 * XXX: what if there is yet IPv4 multicast daemon
701 * using the interface?
702 */
703 ifp = mifp->m6_ifp;
704
705 if_allmulti(ifp, 0);
706 }
707
708 #if notyet
709 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
710 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
711 #endif
712 bzero((caddr_t)mifp, sizeof(*mifp));
713
714 /* Adjust nummifs down */
715 for (mifi = nummifs; mifi > 0; mifi--)
716 if (mif6table[mifi - 1].m6_ifp)
717 break;
718 nummifs = mifi;
719
720
721 #if MRT6DEBUG
722 if (mrt6debug)
723 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
724 #endif
725
726 return 0;
727 }
728
729 /*
730 * Add an mfc entry
731 */
732 static int
733 add_m6fc(mfccp)
734 struct mf6cctl *mfccp;
735 {
736 struct mf6c *rt;
737 u_int32_t hash;
738 struct rtdetq *rte;
739 u_short nstl;
740
741 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
742 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
743
744 /* If an entry already exists, just update the fields */
745 if (rt) {
746 #if MRT6DEBUG
747 if (mrt6debug & DEBUG_MFC)
748 log(LOG_DEBUG,
749 "add_m6fc no upcall h %d o %s g %s p %x\n",
750 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
751 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
752 mfccp->mf6cc_parent);
753 #endif
754
755 rt->mf6c_parent = mfccp->mf6cc_parent;
756 rt->mf6c_ifset = mfccp->mf6cc_ifset;
757 return 0;
758 }
759
760 /*
761 * Find the entry for which the upcall was made and update
762 */
763 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
764 mfccp->mf6cc_mcastgrp.sin6_addr);
765 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
766 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
767 &mfccp->mf6cc_origin.sin6_addr) &&
768 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
769 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
770 (rt->mf6c_stall != NULL)) {
771
772 if (nstl++)
773 log(LOG_ERR,
774 "add_m6fc: %s o %s g %s p %x dbx %p\n",
775 "multiple kernel entries",
776 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
777 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
778 mfccp->mf6cc_parent, rt->mf6c_stall);
779
780 #if MRT6DEBUG
781 if (mrt6debug & DEBUG_MFC)
782 log(LOG_DEBUG,
783 "add_m6fc o %s g %s p %x dbg %x\n",
784 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
785 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
786 mfccp->mf6cc_parent, rt->mf6c_stall);
787 #endif
788
789 rt->mf6c_origin = mfccp->mf6cc_origin;
790 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
791 rt->mf6c_parent = mfccp->mf6cc_parent;
792 rt->mf6c_ifset = mfccp->mf6cc_ifset;
793 /* initialize pkt counters per src-grp */
794 rt->mf6c_pkt_cnt = 0;
795 rt->mf6c_byte_cnt = 0;
796 rt->mf6c_wrong_if = 0;
797
798 rt->mf6c_expire = 0; /* Don't clean this guy up */
799 n6expire[hash]--;
800
801 /* free packets Qed at the end of this entry */
802 for (rte = rt->mf6c_stall; rte != NULL; ) {
803 struct rtdetq *n = rte->next;
804 ip6_mdq(rte->m, rte->ifp, rt);
805 m_freem(rte->m);
806 #if UPCALL_TIMING
807 collate(&(rte->t));
808 #endif /* UPCALL_TIMING */
809 FREE(rte, M_MRTABLE);
810 rte = n;
811 }
812 rt->mf6c_stall = NULL;
813 }
814 }
815
816 /*
817 * It is possible that an entry is being inserted without an upcall
818 */
819 if (nstl == 0) {
820 #if MRT6DEBUG
821 if (mrt6debug & DEBUG_MFC)
822 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n",
823 hash,
824 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
825 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
826 mfccp->mf6cc_parent);
827 #endif
828
829 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
830
831 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
832 &mfccp->mf6cc_origin.sin6_addr)&&
833 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
834 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
835
836 rt->mf6c_origin = mfccp->mf6cc_origin;
837 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
838 rt->mf6c_parent = mfccp->mf6cc_parent;
839 rt->mf6c_ifset = mfccp->mf6cc_ifset;
840 /* initialize pkt counters per src-grp */
841 rt->mf6c_pkt_cnt = 0;
842 rt->mf6c_byte_cnt = 0;
843 rt->mf6c_wrong_if = 0;
844
845 if (rt->mf6c_expire)
846 n6expire[hash]--;
847 rt->mf6c_expire = 0;
848 }
849 }
850 if (rt == NULL) {
851 /* no upcall, so make a new entry */
852 rt = (struct mf6c *)_MALLOC(sizeof(*rt), M_MRTABLE,
853 M_NOWAIT);
854 if (rt == NULL) {
855 return ENOBUFS;
856 }
857
858 /* insert new entry at head of hash chain */
859 rt->mf6c_origin = mfccp->mf6cc_origin;
860 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
861 rt->mf6c_parent = mfccp->mf6cc_parent;
862 rt->mf6c_ifset = mfccp->mf6cc_ifset;
863 /* initialize pkt counters per src-grp */
864 rt->mf6c_pkt_cnt = 0;
865 rt->mf6c_byte_cnt = 0;
866 rt->mf6c_wrong_if = 0;
867 rt->mf6c_expire = 0;
868 rt->mf6c_stall = NULL;
869
870 /* link into table */
871 rt->mf6c_next = mf6ctable[hash];
872 mf6ctable[hash] = rt;
873 }
874 }
875 return 0;
876 }
877
878 #if UPCALL_TIMING
879 /*
880 * collect delay statistics on the upcalls
881 */
882 static void
883 collate(t)
884 struct timeval *t;
885 {
886 u_int32_t d;
887 struct timeval tp;
888 u_int32_t delta;
889
890 GET_TIME(tp);
891
892 if (TV_LT(*t, tp))
893 {
894 TV_DELTA(tp, *t, delta);
895
896 d = delta >> 10;
897 if (d > UPCALL_MAX)
898 d = UPCALL_MAX;
899
900 ++upcall_data[d];
901 }
902 }
903 #endif /* UPCALL_TIMING */
904
905 /*
906 * Delete an mfc entry
907 */
908 static int
909 del_m6fc(mfccp)
910 struct mf6cctl *mfccp;
911 {
912 struct sockaddr_in6 origin;
913 struct sockaddr_in6 mcastgrp;
914 struct mf6c *rt;
915 struct mf6c **nptr;
916 u_int32_t hash;
917
918 origin = mfccp->mf6cc_origin;
919 mcastgrp = mfccp->mf6cc_mcastgrp;
920 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
921
922 #if MRT6DEBUG
923 if (mrt6debug & DEBUG_MFC)
924 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
925 ip6_sprintf(&origin.sin6_addr),
926 ip6_sprintf(&mcastgrp.sin6_addr));
927 #endif
928
929
930 nptr = &mf6ctable[hash];
931 while ((rt = *nptr) != NULL) {
932 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
933 &rt->mf6c_origin.sin6_addr) &&
934 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
935 &rt->mf6c_mcastgrp.sin6_addr) &&
936 rt->mf6c_stall == NULL)
937 break;
938
939 nptr = &rt->mf6c_next;
940 }
941 if (rt == NULL) {
942 return EADDRNOTAVAIL;
943 }
944
945 *nptr = rt->mf6c_next;
946 FREE(rt, M_MRTABLE);
947
948
949 return 0;
950 }
951
952 static int
953 socket_send(s, mm, src)
954 struct socket *s;
955 struct mbuf *mm;
956 struct sockaddr_in6 *src;
957 {
958 //### LD 5/27/04 needs locking!
959 //
960 if (s) {
961 if (sbappendaddr(&s->so_rcv,
962 (struct sockaddr *)src,
963 mm, (struct mbuf *)0, NULL) != 0) {
964 sorwakeup(s);
965 return 0;
966 }
967 }
968 return -1;
969 }
970
971 /*
972 * IPv6 multicast forwarding function. This function assumes that the packet
973 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
974 * pointed to by "ifp", and the packet is to be relayed to other networks
975 * that have members of the packet's destination IPv6 multicast group.
976 *
977 * The packet is returned unscathed to the caller, unless it is
978 * erroneous, in which case a non-zero return value tells the caller to
979 * discard it.
980 */
981
982 int
983 ip6_mforward(ip6, ifp, m)
984 struct ip6_hdr *ip6;
985 struct ifnet *ifp;
986 struct mbuf *m;
987 {
988 struct mf6c *rt;
989 struct mif6 *mifp;
990 struct mbuf *mm;
991 mifi_t mifi;
992 struct timeval timenow;
993
994 #if MRT6DEBUG
995 if (mrt6debug & DEBUG_FORWARD)
996 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
997 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
998 ifp->if_index);
999 #endif
1000
1001 /*
1002 * Don't forward a packet with Hop limit of zero or one,
1003 * or a packet destined to a local-only group.
1004 */
1005 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) ||
1006 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1007 return 0;
1008 ip6->ip6_hlim--;
1009
1010 /*
1011 * Source address check: do not forward packets with unspecified
1012 * source. It was discussed in July 2000, on ipngwg mailing list.
1013 * This is rather more serious than unicast cases, because some
1014 * MLD packets can be sent with the unspecified source address
1015 * (although such packets must normally set 1 to the hop limit field).
1016 */
1017 getmicrotime(&timenow);
1018 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1019 ip6stat.ip6s_cantforward++;
1020 if (ip6_log_time + ip6_log_interval < timenow.tv_sec) {
1021 ip6_log_time = timenow.tv_sec;
1022 log(LOG_DEBUG,
1023 "cannot forward "
1024 "from %s to %s nxt %d received on %s\n",
1025 ip6_sprintf(&ip6->ip6_src),
1026 ip6_sprintf(&ip6->ip6_dst),
1027 ip6->ip6_nxt,
1028 if_name(m->m_pkthdr.rcvif));
1029 }
1030 return 0;
1031 }
1032
1033 /*
1034 * Determine forwarding mifs from the forwarding cache table
1035 */
1036 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1037
1038 /* Entry exists, so forward if necessary */
1039 if (rt) {
1040 return (ip6_mdq(m, ifp, rt));
1041 } else {
1042 /*
1043 * If we don't have a route for packet's origin,
1044 * Make a copy of the packet &
1045 * send message to routing daemon
1046 */
1047
1048 struct mbuf *mb0;
1049 struct rtdetq *rte;
1050 u_int32_t hash;
1051 /* int i, npkts;*/
1052 #if UPCALL_TIMING
1053 struct timeval tp;
1054
1055 GET_TIME(tp);
1056 #endif /* UPCALL_TIMING */
1057
1058 mrt6stat.mrt6s_no_route++;
1059 #if MRT6DEBUG
1060 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1061 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1062 ip6_sprintf(&ip6->ip6_src),
1063 ip6_sprintf(&ip6->ip6_dst));
1064 #endif
1065
1066 /*
1067 * Allocate mbufs early so that we don't do extra work if we
1068 * are just going to fail anyway.
1069 */
1070 rte = (struct rtdetq *)_MALLOC(sizeof(*rte), M_MRTABLE,
1071 M_NOWAIT);
1072 if (rte == NULL) {
1073 return ENOBUFS;
1074 }
1075 mb0 = m_copy(m, 0, M_COPYALL);
1076 /*
1077 * Pullup packet header if needed before storing it,
1078 * as other references may modify it in the meantime.
1079 */
1080 if (mb0 &&
1081 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1082 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1083 if (mb0 == NULL) {
1084 FREE(rte, M_MRTABLE);
1085 return ENOBUFS;
1086 }
1087
1088 /* is there an upcall waiting for this packet? */
1089 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1090 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1091 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1092 &rt->mf6c_origin.sin6_addr) &&
1093 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1094 &rt->mf6c_mcastgrp.sin6_addr) &&
1095 (rt->mf6c_stall != NULL))
1096 break;
1097 }
1098
1099 if (rt == NULL) {
1100 struct mrt6msg *im;
1101 #if MRT6_OINIT
1102 struct omrt6msg *oim;
1103 #endif
1104
1105 /* no upcall, so make a new entry */
1106 rt = (struct mf6c *)_MALLOC(sizeof(*rt), M_MRTABLE,
1107 M_NOWAIT);
1108 if (rt == NULL) {
1109 FREE(rte, M_MRTABLE);
1110 m_freem(mb0);
1111 return ENOBUFS;
1112 }
1113 /*
1114 * Make a copy of the header to send to the user
1115 * level process
1116 */
1117 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1118
1119 if (mm == NULL) {
1120 FREE(rte, M_MRTABLE);
1121 m_freem(mb0);
1122 FREE(rt, M_MRTABLE);
1123 return ENOBUFS;
1124 }
1125
1126 /*
1127 * Send message to routing daemon
1128 */
1129 sin6.sin6_addr = ip6->ip6_src;
1130
1131 im = NULL;
1132 #if MRT6_OINIT
1133 oim = NULL;
1134 #endif
1135 switch (ip6_mrouter_ver) {
1136 #if MRT6_OINIT
1137 case MRT6_OINIT:
1138 oim = mtod(mm, struct omrt6msg *);
1139 oim->im6_msgtype = MRT6MSG_NOCACHE;
1140 oim->im6_mbz = 0;
1141 break;
1142 #endif
1143 case MRT6_INIT:
1144 im = mtod(mm, struct mrt6msg *);
1145 im->im6_msgtype = MRT6MSG_NOCACHE;
1146 im->im6_mbz = 0;
1147 break;
1148 default:
1149 FREE(rte, M_MRTABLE);
1150 m_freem(mb0);
1151 FREE(rt, M_MRTABLE);
1152 return EINVAL;
1153 }
1154
1155 #if MRT6DEBUG
1156 if (mrt6debug & DEBUG_FORWARD)
1157 log(LOG_DEBUG,
1158 "getting the iif info in the kernel\n");
1159 #endif
1160
1161 for (mifp = mif6table, mifi = 0;
1162 mifi < nummifs && mifp->m6_ifp != ifp;
1163 mifp++, mifi++)
1164 ;
1165
1166 switch (ip6_mrouter_ver) {
1167 #if MRT6_OINIT
1168 case MRT6_OINIT:
1169 oim->im6_mif = mifi;
1170 break;
1171 #endif
1172 case MRT6_INIT:
1173 im->im6_mif = mifi;
1174 break;
1175 }
1176
1177 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1178 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1179 "socket queue full\n");
1180 mrt6stat.mrt6s_upq_sockfull++;
1181 FREE(rte, M_MRTABLE);
1182 m_freem(mb0);
1183 FREE(rt, M_MRTABLE);
1184 return ENOBUFS;
1185 }
1186
1187 mrt6stat.mrt6s_upcalls++;
1188
1189 /* insert new entry at head of hash chain */
1190 bzero(rt, sizeof(*rt));
1191 rt->mf6c_origin.sin6_family = AF_INET6;
1192 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1193 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1194 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1195 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1196 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1197 rt->mf6c_expire = UPCALL_EXPIRE;
1198 n6expire[hash]++;
1199 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1200
1201 /* link into table */
1202 rt->mf6c_next = mf6ctable[hash];
1203 mf6ctable[hash] = rt;
1204 /* Add this entry to the end of the queue */
1205 rt->mf6c_stall = rte;
1206 } else {
1207 /* determine if q has overflowed */
1208 struct rtdetq **p;
1209 int npkts = 0;
1210
1211 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1212 if (++npkts > MAX_UPQ6) {
1213 mrt6stat.mrt6s_upq_ovflw++;
1214 FREE(rte, M_MRTABLE);
1215 m_freem(mb0);
1216 return 0;
1217 }
1218
1219 /* Add this entry to the end of the queue */
1220 *p = rte;
1221 }
1222
1223 rte->next = NULL;
1224 rte->m = mb0;
1225 rte->ifp = ifp;
1226 #if UPCALL_TIMING
1227 rte->t = tp;
1228 #endif /* UPCALL_TIMING */
1229
1230
1231 return 0;
1232 }
1233 }
1234
1235 /*
1236 * Clean up cache entries if upcalls are not serviced
1237 * Call from the Slow Timeout mechanism, every half second.
1238 */
1239 static void
1240 expire_upcalls(
1241 __unused void *unused)
1242 {
1243 struct rtdetq *rte;
1244 struct mf6c *mfc, **nptr;
1245 int i;
1246
1247 for (i = 0; i < MF6CTBLSIZ; i++) {
1248 if (n6expire[i] == 0)
1249 continue;
1250 nptr = &mf6ctable[i];
1251 while ((mfc = *nptr) != NULL) {
1252 rte = mfc->mf6c_stall;
1253 /*
1254 * Skip real cache entries
1255 * Make sure it wasn't marked to not expire (shouldn't happen)
1256 * If it expires now
1257 */
1258 if (rte != NULL &&
1259 mfc->mf6c_expire != 0 &&
1260 --mfc->mf6c_expire == 0) {
1261 #if MRT6DEBUG
1262 if (mrt6debug & DEBUG_EXPIRE)
1263 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1264 ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
1265 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
1266 #endif
1267 /*
1268 * drop all the packets
1269 * free the mbuf with the pkt, if, timing info
1270 */
1271 do {
1272 struct rtdetq *n = rte->next;
1273 m_freem(rte->m);
1274 FREE(rte, M_MRTABLE);
1275 rte = n;
1276 } while (rte != NULL);
1277 mrt6stat.mrt6s_cache_cleanups++;
1278 n6expire[i]--;
1279
1280 *nptr = mfc->mf6c_next;
1281 FREE(mfc, M_MRTABLE);
1282 } else {
1283 nptr = &mfc->mf6c_next;
1284 }
1285 }
1286 }
1287
1288 #ifndef __APPLE__
1289 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1290 expire_upcalls, NULL);
1291 #else
1292 timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
1293 #endif
1294 }
1295
1296 /*
1297 * Packet forwarding routine once entry in the cache is made
1298 */
1299 static int
1300 ip6_mdq(m, ifp, rt)
1301 struct mbuf *m;
1302 struct ifnet *ifp;
1303 struct mf6c *rt;
1304 {
1305 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1306 mifi_t mifi, iif;
1307 struct mif6 *mifp;
1308 int plen = m->m_pkthdr.len;
1309
1310 /*
1311 * Macro to send packet on mif. Since RSVP packets don't get counted on
1312 * input, they shouldn't get counted on output, so statistics keeping is
1313 * separate.
1314 */
1315
1316 #define MC6_SEND(ip6, mifp, m) do { \
1317 if ((mifp)->m6_flags & MIFF_REGISTER) \
1318 register_send((ip6), (mifp), (m)); \
1319 else \
1320 phyint_send((ip6), (mifp), (m)); \
1321 } while (0)
1322
1323 /*
1324 * Don't forward if it didn't arrive from the parent mif
1325 * for its origin.
1326 */
1327 mifi = rt->mf6c_parent;
1328 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1329 /* came in the wrong interface */
1330 #if MRT6DEBUG
1331 if (mrt6debug & DEBUG_FORWARD)
1332 log(LOG_DEBUG,
1333 "wrong if: ifid %d mifi %d mififid %x\n",
1334 ifp->if_index, mifi,
1335 mif6table[mifi].m6_ifp->if_index);
1336 #endif
1337 mrt6stat.mrt6s_wrong_if++;
1338 rt->mf6c_wrong_if++;
1339 /*
1340 * If we are doing PIM processing, and we are forwarding
1341 * packets on this interface, send a message to the
1342 * routing daemon.
1343 */
1344 /* have to make sure this is a valid mif */
1345 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1346 if (pim6 && (m->m_flags & M_LOOP) == 0) {
1347 /*
1348 * Check the M_LOOP flag to avoid an
1349 * unnecessary PIM assert.
1350 * XXX: M_LOOP is an ad-hoc hack...
1351 */
1352 static struct sockaddr_in6 addr =
1353 { sizeof(addr), AF_INET6 , 0, 0, IN6ADDR_ANY_INIT, 0};
1354
1355 struct mbuf *mm;
1356 struct mrt6msg *im;
1357 #if MRT6_OINIT
1358 struct omrt6msg *oim;
1359 #endif
1360
1361 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1362 if (mm &&
1363 (M_HASCL(mm) ||
1364 mm->m_len < sizeof(struct ip6_hdr)))
1365 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1366 if (mm == NULL)
1367 return ENOBUFS;
1368
1369 #if MRT6_OINIT
1370 oim = NULL;
1371 #endif
1372 im = NULL;
1373 switch (ip6_mrouter_ver) {
1374 #if MRT6_OINIT
1375 case MRT6_OINIT:
1376 oim = mtod(mm, struct omrt6msg *);
1377 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1378 oim->im6_mbz = 0;
1379 break;
1380 #endif
1381 case MRT6_INIT:
1382 im = mtod(mm, struct mrt6msg *);
1383 im->im6_msgtype = MRT6MSG_WRONGMIF;
1384 im->im6_mbz = 0;
1385 break;
1386 default:
1387 m_freem(mm);
1388 return EINVAL;
1389 }
1390
1391 for (mifp = mif6table, iif = 0;
1392 iif < nummifs && mifp &&
1393 mifp->m6_ifp != ifp;
1394 mifp++, iif++)
1395 ;
1396
1397 switch (ip6_mrouter_ver) {
1398 #if MRT6_OINIT
1399 case MRT6_OINIT:
1400 oim->im6_mif = iif;
1401 addr.sin6_addr = oim->im6_src;
1402 break;
1403 #endif
1404 case MRT6_INIT:
1405 im->im6_mif = iif;
1406 addr.sin6_addr = im->im6_src;
1407 break;
1408 }
1409
1410 mrt6stat.mrt6s_upcalls++;
1411
1412 if (socket_send(ip6_mrouter, mm, &addr) < 0) {
1413 #if MRT6DEBUG
1414 if (mrt6debug)
1415 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1416 #endif
1417 ++mrt6stat.mrt6s_upq_sockfull;
1418 return ENOBUFS;
1419 } /* if socket Q full */
1420 } /* if PIM */
1421 return 0;
1422 } /* if wrong iif */
1423
1424 /* If I sourced this packet, it counts as output, else it was input. */
1425 if (m->m_pkthdr.rcvif == NULL) {
1426 /* XXX: is rcvif really NULL when output?? */
1427 mif6table[mifi].m6_pkt_out++;
1428 mif6table[mifi].m6_bytes_out += plen;
1429 } else {
1430 mif6table[mifi].m6_pkt_in++;
1431 mif6table[mifi].m6_bytes_in += plen;
1432 }
1433 rt->mf6c_pkt_cnt++;
1434 rt->mf6c_byte_cnt += plen;
1435
1436 /*
1437 * For each mif, forward a copy of the packet if there are group
1438 * members downstream on the interface.
1439 */
1440 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++)
1441 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1442 /*
1443 * check if the outgoing packet is going to break
1444 * a scope boundary.
1445 * XXX For packets through PIM register tunnel
1446 * interface, we believe a routing daemon.
1447 */
1448 if ((mif6table[rt->mf6c_parent].m6_flags &
1449 MIFF_REGISTER) == 0 &&
1450 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 &&
1451 (in6_addr2scopeid(ifp, &ip6->ip6_dst) !=
1452 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1453 &ip6->ip6_dst) ||
1454 in6_addr2scopeid(ifp, &ip6->ip6_src) !=
1455 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1456 &ip6->ip6_src))) {
1457 ip6stat.ip6s_badscope++;
1458 continue;
1459 }
1460
1461 mifp->m6_pkt_out++;
1462 mifp->m6_bytes_out += plen;
1463 MC6_SEND(ip6, mifp, m);
1464 }
1465 return 0;
1466 }
1467
1468 static void
1469 phyint_send(ip6, mifp, m)
1470 struct ip6_hdr *ip6;
1471 struct mif6 *mifp;
1472 struct mbuf *m;
1473 {
1474 struct mbuf *mb_copy;
1475 struct ifnet *ifp = mifp->m6_ifp;
1476 int error = 0;
1477 static struct route_in6 ro;
1478 struct in6_multi *in6m;
1479 struct sockaddr_in6 *dst6;
1480
1481 /*
1482 * Make a new reference to the packet; make sure that
1483 * the IPv6 header is actually copied, not just referenced,
1484 * so that ip6_output() only scribbles on the copy.
1485 */
1486 mb_copy = m_copy(m, 0, M_COPYALL);
1487 if (mb_copy &&
1488 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1489 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1490 if (mb_copy == NULL) {
1491 return;
1492 }
1493 /* set MCAST flag to the outgoing packet */
1494 mb_copy->m_flags |= M_MCAST;
1495
1496 /*
1497 * If we sourced the packet, call ip6_output since we may devide
1498 * the packet into fragments when the packet is too big for the
1499 * outgoing interface.
1500 * Otherwise, we can simply send the packet to the interface
1501 * sending queue.
1502 */
1503 if (m->m_pkthdr.rcvif == NULL) {
1504 struct ip6_moptions im6o;
1505
1506 im6o.im6o_multicast_ifp = ifp;
1507 /* XXX: ip6_output will override ip6->ip6_hlim */
1508 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1509 im6o.im6o_multicast_loop = 1;
1510 error = ip6_output(mb_copy, NULL, &ro,
1511 IPV6_FORWARDING, &im6o, NULL, 0);
1512
1513
1514 #if MRT6DEBUG
1515 if (mrt6debug & DEBUG_XMIT)
1516 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1517 mifp - mif6table, error);
1518 #endif
1519 return;
1520 }
1521
1522 /*
1523 * If we belong to the destination multicast group
1524 * on the outgoing interface, loop back a copy.
1525 */
1526 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
1527 ifnet_lock_shared(ifp);
1528 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1529 ifnet_lock_done(ifp);
1530 if (in6m != NULL) {
1531 dst6->sin6_len = sizeof(struct sockaddr_in6);
1532 dst6->sin6_family = AF_INET6;
1533 dst6->sin6_addr = ip6->ip6_dst;
1534 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
1535 }
1536 /*
1537 * Put the packet into the sending queue of the outgoing interface
1538 * if it would fit in the MTU of the interface.
1539 */
1540 if (mb_copy->m_pkthdr.len <= ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) {
1541 dst6->sin6_len = sizeof(struct sockaddr_in6);
1542 dst6->sin6_family = AF_INET6;
1543 dst6->sin6_addr = ip6->ip6_dst;
1544 /*
1545 * We just call if_output instead of nd6_output here, since
1546 * we need no ND for a multicast forwarded packet...right?
1547 */
1548 #ifdef __APPLE__
1549 /* Make sure the HW checksum flags are cleaned before sending the packet */
1550
1551 mb_copy->m_pkthdr.rcvif = 0;
1552 mb_copy->m_pkthdr.csum_data = 0;
1553 mb_copy->m_pkthdr.csum_flags = 0;
1554
1555 lck_mtx_unlock(ip6_mutex);
1556 error = dlil_output(ifp, PF_INET6, mb_copy,
1557 NULL, (struct sockaddr *)&ro.ro_dst, 0);
1558 lck_mtx_lock(ip6_mutex);
1559 #else
1560 error = (*ifp->if_output)(ifp, mb_copy,
1561 (struct sockaddr *)&ro.ro_dst,
1562 NULL);
1563 #endif
1564 #if MRT6DEBUG
1565 if (mrt6debug & DEBUG_XMIT)
1566 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1567 mifp - mif6table, error);
1568 #endif
1569 } else {
1570 #if MULTICAST_PMTUD
1571 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
1572 #else
1573 #if MRT6DEBUG
1574 if (mrt6debug & DEBUG_XMIT)
1575 log(LOG_DEBUG,
1576 "phyint_send: packet too big on %s o %s g %s"
1577 " size %d(discarded)\n",
1578 if_name(ifp),
1579 ip6_sprintf(&ip6->ip6_src),
1580 ip6_sprintf(&ip6->ip6_dst),
1581 mb_copy->m_pkthdr.len);
1582 #endif /* MRT6DEBUG */
1583 m_freem(mb_copy); /* simply discard the packet */
1584 #endif
1585 }
1586 }
1587
1588 static int
1589 register_send(ip6, mif, m)
1590 struct ip6_hdr *ip6;
1591 struct mif6 *mif;
1592 struct mbuf *m;
1593 {
1594 struct mbuf *mm;
1595 int i, len = m->m_pkthdr.len;
1596 static struct sockaddr_in6 addr = { sizeof(addr), AF_INET6 ,
1597 0, 0, IN6ADDR_ANY_INIT, 0};
1598 struct mrt6msg *im6;
1599
1600 #if MRT6DEBUG
1601 if (mrt6debug)
1602 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1603 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
1604 #endif
1605 ++pim6stat.pim6s_snd_registers;
1606
1607 /* Make a copy of the packet to send to the user level process */
1608 MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1609 if (mm == NULL)
1610 return ENOBUFS;
1611 #ifdef __darwin8_notyet
1612 #if CONFIG_MACF_NET
1613 mac_create_mbuf_multicast_encap(m, mif->m6_ifp, mm);
1614 #endif
1615 #endif
1616 mm->m_pkthdr.rcvif = NULL;
1617 mm->m_data += max_linkhdr;
1618 mm->m_len = sizeof(struct ip6_hdr);
1619
1620 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1621 m_freem(mm);
1622 return ENOBUFS;
1623 }
1624 i = MHLEN - M_LEADINGSPACE(mm);
1625 if (i > len)
1626 i = len;
1627 mm = m_pullup(mm, i);
1628 if (mm == NULL){
1629 m_freem(mm);
1630 return ENOBUFS;
1631 }
1632 /* TODO: check it! */
1633 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1634
1635 /*
1636 * Send message to routing daemon
1637 */
1638 addr.sin6_addr = ip6->ip6_src;
1639
1640 im6 = mtod(mm, struct mrt6msg *);
1641 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1642 im6->im6_mbz = 0;
1643
1644 im6->im6_mif = mif - mif6table;
1645
1646 /* iif info is not given for reg. encap.n */
1647 mrt6stat.mrt6s_upcalls++;
1648
1649 if (socket_send(ip6_mrouter, mm, &addr) < 0) {
1650 #if MRT6DEBUG
1651 if (mrt6debug)
1652 log(LOG_WARNING,
1653 "register_send: ip6_mrouter socket queue full\n");
1654 #endif
1655 ++mrt6stat.mrt6s_upq_sockfull;
1656 return ENOBUFS;
1657 }
1658 return 0;
1659 }
1660
1661 /*
1662 * PIM sparse mode hook
1663 * Receives the pim control messages, and passes them up to the listening
1664 * socket, using rip6_input.
1665 * The only message processed is the REGISTER pim message; the pim header
1666 * is stripped off, and the inner packet is passed to register_mforward.
1667 */
1668 int
1669 pim6_input(mp, offp)
1670 struct mbuf **mp;
1671 int *offp;
1672 {
1673 struct pim *pim; /* pointer to a pim struct */
1674 struct ip6_hdr *ip6;
1675 int pimlen;
1676 struct mbuf *m = *mp;
1677 int minlen;
1678 int off = *offp;
1679 int proto;
1680
1681 ++pim6stat.pim6s_rcv_total;
1682
1683 ip6 = mtod(m, struct ip6_hdr *);
1684 pimlen = m->m_pkthdr.len - *offp;
1685 proto = ip6->ip6_nxt;
1686
1687 /*
1688 * Validate lengths
1689 */
1690 if (pimlen < PIM_MINLEN) {
1691 ++pim6stat.pim6s_rcv_tooshort;
1692 #if MRT6DEBUG
1693 if (mrt6debug & DEBUG_PIM)
1694 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1695 #endif
1696 m_freem(m);
1697 return(IPPROTO_DONE);
1698 }
1699
1700 /*
1701 * if the packet is at least as big as a REGISTER, go ahead
1702 * and grab the PIM REGISTER header size, to avoid another
1703 * possible m_pullup() later.
1704 *
1705 * PIM_MINLEN == pimhdr + u_int32 == 8
1706 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1707 */
1708 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1709
1710 /*
1711 * Make sure that the IP6 and PIM headers in contiguous memory, and
1712 * possibly the PIM REGISTER header
1713 */
1714 #ifndef PULLDOWN_TEST
1715 IP6_EXTHDR_CHECK(m, off, minlen, return IPPROTO_DONE);
1716 /* adjust pointer */
1717 ip6 = mtod(m, struct ip6_hdr *);
1718
1719 /* adjust mbuf to point to the PIM header */
1720 pim = (struct pim *)((caddr_t)ip6 + off);
1721 #else
1722 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1723 if (pim == NULL) {
1724 pim6stat.pim6s_rcv_tooshort++;
1725 return IPPROTO_DONE;
1726 }
1727 #endif
1728
1729 #define PIM6_CHECKSUM
1730 #ifdef PIM6_CHECKSUM
1731 {
1732 int cksumlen;
1733
1734 /*
1735 * Validate checksum.
1736 * If PIM REGISTER, exclude the data packet
1737 */
1738 if (pim->pim_type == PIM_REGISTER)
1739 cksumlen = PIM_MINLEN;
1740 else
1741 cksumlen = pimlen;
1742
1743 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1744 ++pim6stat.pim6s_rcv_badsum;
1745 #if MRT6DEBUG
1746 if (mrt6debug & DEBUG_PIM)
1747 log(LOG_DEBUG,
1748 "pim6_input: invalid checksum\n");
1749 #endif
1750 m_freem(m);
1751 return(IPPROTO_DONE);
1752 }
1753 }
1754 #endif /* PIM_CHECKSUM */
1755
1756 /* PIM version check */
1757 if (pim->pim_ver != PIM_VERSION) {
1758 ++pim6stat.pim6s_rcv_badversion;
1759 #if MRT6DEBUG
1760 log(LOG_ERR,
1761 "pim6_input: incorrect version %d, expecting %d\n",
1762 pim->pim_ver, PIM_VERSION);
1763 #endif
1764 m_freem(m);
1765 return(IPPROTO_DONE);
1766 }
1767
1768 if (pim->pim_type == PIM_REGISTER) {
1769 /*
1770 * since this is a REGISTER, we'll make a copy of the register
1771 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1772 * routing daemon.
1773 */
1774 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 ,
1775 0, 0, IN6ADDR_ANY_INIT, 0 };
1776
1777 struct mbuf *mcp;
1778 struct ip6_hdr *eip6;
1779 u_int32_t *reghdr;
1780
1781 ++pim6stat.pim6s_rcv_registers;
1782
1783 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1784 #if MRT6DEBUG
1785 if (mrt6debug & DEBUG_PIM)
1786 log(LOG_DEBUG,
1787 "pim6_input: register mif not set: %d\n",
1788 reg_mif_num);
1789 #endif
1790 m_freem(m);
1791 return(IPPROTO_DONE);
1792 }
1793
1794 reghdr = (u_int32_t *)(pim + 1);
1795
1796 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1797 goto pim6_input_to_daemon;
1798
1799 /*
1800 * Validate length
1801 */
1802 if (pimlen < PIM6_REG_MINLEN) {
1803 ++pim6stat.pim6s_rcv_tooshort;
1804 ++pim6stat.pim6s_rcv_badregisters;
1805 #if MRT6DEBUG
1806 log(LOG_ERR,
1807 "pim6_input: register packet size too "
1808 "small %d from %s\n",
1809 pimlen, ip6_sprintf(&ip6->ip6_src));
1810 #endif
1811 m_freem(m);
1812 return(IPPROTO_DONE);
1813 }
1814
1815 eip6 = (struct ip6_hdr *) (reghdr + 1);
1816 #if MRT6DEBUG
1817 if (mrt6debug & DEBUG_PIM)
1818 log(LOG_DEBUG,
1819 "pim6_input[register], eip6: %s -> %s, "
1820 "eip6 plen %d\n",
1821 ip6_sprintf(&eip6->ip6_src),
1822 ip6_sprintf(&eip6->ip6_dst),
1823 ntohs(eip6->ip6_plen));
1824 #endif
1825
1826 /* verify the version number of the inner packet */
1827 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1828 ++pim6stat.pim6s_rcv_badregisters;
1829 #if MRT6DEBUG
1830 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1831 "of the inner packet\n",
1832 (eip6->ip6_vfc & IPV6_VERSION));
1833 #endif
1834 m_freem(m);
1835 return(IPPROTO_NONE);
1836 }
1837
1838 /* verify the inner packet is destined to a mcast group */
1839 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1840 ++pim6stat.pim6s_rcv_badregisters;
1841 #if MRT6DEBUG
1842 if (mrt6debug & DEBUG_PIM)
1843 log(LOG_DEBUG,
1844 "pim6_input: inner packet of register "
1845 "is not multicast %s\n",
1846 ip6_sprintf(&eip6->ip6_dst));
1847 #endif
1848 m_freem(m);
1849 return(IPPROTO_DONE);
1850 }
1851
1852 /*
1853 * make a copy of the whole header to pass to the daemon later.
1854 */
1855 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1856 if (mcp == NULL) {
1857 #if MRT6DEBUG
1858 log(LOG_ERR,
1859 "pim6_input: pim register: "
1860 "could not copy register head\n");
1861 #endif
1862 m_freem(m);
1863 return(IPPROTO_DONE);
1864 }
1865
1866 /*
1867 * forward the inner ip6 packet; point m_data at the inner ip6.
1868 */
1869 m_adj(m, off + PIM_MINLEN);
1870 #if MRT6DEBUG
1871 if (mrt6debug & DEBUG_PIM) {
1872 log(LOG_DEBUG,
1873 "pim6_input: forwarding decapsulated register: "
1874 "src %s, dst %s, mif %d\n",
1875 ip6_sprintf(&eip6->ip6_src),
1876 ip6_sprintf(&eip6->ip6_dst),
1877 reg_mif_num);
1878 }
1879 #endif
1880
1881 #ifdef __APPLE__
1882
1883 if (lo_ifp) {
1884 lck_mtx_unlock(ip6_mutex);
1885 dlil_output(lo_ifp, PF_INET6, m, 0, (struct sockaddr *)&dst, 0);
1886 lck_mtx_lock(ip6_mutex);
1887 }
1888 else {
1889 printf("Warning: pim6_input call to dlil_find_dltag failed!\n");
1890 m_freem(m);
1891 }
1892 #else
1893 (void) if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1894 dst.sin6_family, NULL);
1895 #endif
1896
1897 /* prepare the register head to send to the mrouting daemon */
1898 m = mcp;
1899 }
1900
1901 /*
1902 * Pass the PIM message up to the daemon; if it is a register message
1903 * pass the 'head' only up to the daemon. This includes the
1904 * encapsulator ip6 header, pim header, register header and the
1905 * encapsulated ip6 header.
1906 */
1907 pim6_input_to_daemon:
1908 rip6_input(&m, offp);
1909 return(IPPROTO_DONE);
1910 }
1911 #endif
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