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1 /* $FreeBSD: src/sys/netinet6/ip6_mroute.c,v 1.2.2.4 2001/07/03 11:01:53 ume Exp $ */
2 /* $KAME: ip6_mroute.c,v 1.46 2001/04/04 05:17:30 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */
34
35 /*
36 * IP multicast forwarding procedures
37 *
38 * Written by David Waitzman, BBN Labs, August 1988.
39 * Modified by Steve Deering, Stanford, February 1989.
40 * Modified by Mark J. Steiglitz, Stanford, May, 1991
41 * Modified by Van Jacobson, LBL, January 1993
42 * Modified by Ajit Thyagarajan, PARC, August 1993
43 * Modified by Bill Fenenr, PARC, April 1994
44 *
45 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
46 */
47
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/malloc.h>
52 #include <sys/mbuf.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/sockio.h>
56 #include <sys/protosw.h>
57 #include <sys/errno.h>
58 #include <sys/time.h>
59 #include <sys/kernel.h>
60 #include <sys/syslog.h>
61
62 #include <net/if.h>
63 #include <net/route.h>
64 #include <net/raw_cb.h>
65
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68
69 #include <netinet/ip6.h>
70 #include <netinet6/ip6_var.h>
71 #include <netinet6/ip6_mroute.h>
72 #include <netinet6/pim6.h>
73 #include <netinet6/pim6_var.h>
74
75 #ifndef __APPLE__
76 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry");
77 #endif
78
79 #define M_HASCL(m) ((m)->m_flags & M_EXT)
80
81 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *));
82 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *));
83
84 static int set_pim6 __P((int *));
85 static int socket_send __P((struct socket *, struct mbuf *,
86 struct sockaddr_in6 *));
87 static int register_send __P((struct ip6_hdr *, struct mif6 *,
88 struct mbuf *));
89
90 /*
91 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,
92 * except for netstat or debugging purposes.
93 */
94 struct socket *ip6_mrouter = NULL;
95 int ip6_mrouter_ver = 0;
96 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */
97 struct mrt6stat mrt6stat;
98
99 #define NO_RTE_FOUND 0x1
100 #define RTE_FOUND 0x2
101
102 struct mf6c *mf6ctable[MF6CTBLSIZ];
103 u_char nexpire[MF6CTBLSIZ];
104 static struct mif6 mif6table[MAXMIFS];
105 #if MRT6DEBUG
106 u_int mrt6debug = 0; /* debug level */
107 #define DEBUG_MFC 0x02
108 #define DEBUG_FORWARD 0x04
109 #define DEBUG_EXPIRE 0x08
110 #define DEBUG_XMIT 0x10
111 #define DEBUG_REG 0x20
112 #define DEBUG_PIM 0x40
113 #endif
114
115 static void expire_upcalls __P((void *));
116 static void expire_upcalls_funneled __P((void *));
117
118 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
119 #define UPCALL_EXPIRE 6 /* number of timeouts */
120
121 #if INET
122 #if MROUTING
123 extern struct socket *ip_mrouter;
124 #endif
125 #endif
126
127 static u_long lo_dl_tag = 0;
128 /*
129 * 'Interfaces' associated with decapsulator (so we can tell
130 * packets that went through it from ones that get reflected
131 * by a broken gateway). These interfaces are never linked into
132 * the system ifnet list & no routes point to them. I.e., packets
133 * can't be sent this way. They only exist as a placeholder for
134 * multicast source verification.
135 */
136 struct ifnet multicast_register_if;
137
138 #define ENCAP_HOPS 64
139
140 /*
141 * Private variables.
142 */
143 static mifi_t nummifs = 0;
144 static mifi_t reg_mif_num = (mifi_t)-1;
145
146 static struct pim6stat pim6stat;
147
148 /*
149 * one-back cache used by ipip_input to locate a tunnel's mif
150 * given a datagram's src ip address.
151 */
152 static int pim6;
153
154 /*
155 * Hash function for a source, group entry
156 */
157 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
158 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
159 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
160 (g).s6_addr32[2] ^ (g).s6_addr32[3])
161
162 /*
163 * Find a route for a given origin IPv6 address and Multicast group address.
164 * Quality of service parameter to be added in the future!!!
165 */
166
167 #define MF6CFIND(o, g, rt) do { \
168 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
169 rt = NULL; \
170 mrt6stat.mrt6s_mfc_lookups++; \
171 while (_rt) { \
172 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
173 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
174 (_rt->mf6c_stall == NULL)) { \
175 rt = _rt; \
176 break; \
177 } \
178 _rt = _rt->mf6c_next; \
179 } \
180 if (rt == NULL) { \
181 mrt6stat.mrt6s_mfc_misses++; \
182 } \
183 } while (0)
184
185 /*
186 * Macros to compute elapsed time efficiently
187 * Borrowed from Van Jacobson's scheduling code
188 */
189 #define TV_DELTA(a, b, delta) do { \
190 int xxs; \
191 \
192 delta = (a).tv_usec - (b).tv_usec; \
193 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
194 switch (xxs) { \
195 case 2: \
196 delta += 1000000; \
197 /* fall through */ \
198 case 1: \
199 delta += 1000000; \
200 break; \
201 default: \
202 delta += (1000000 * xxs); \
203 } \
204 } \
205 } while (0)
206
207 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
208 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
209
210 #if UPCALL_TIMING
211 #define UPCALL_MAX 50
212 u_long upcall_data[UPCALL_MAX + 1];
213 static void collate();
214 #endif /* UPCALL_TIMING */
215
216 static int get_sg_cnt __P((struct sioc_sg_req6 *));
217 static int get_mif6_cnt __P((struct sioc_mif_req6 *));
218 static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int));
219 static int add_m6if __P((struct mif6ctl *));
220 static int del_m6if __P((mifi_t *));
221 static int add_m6fc __P((struct mf6cctl *));
222 static int del_m6fc __P((struct mf6cctl *));
223
224 #ifndef __APPLE__
225 static struct callout expire_upcalls_ch;
226 #endif
227 /*
228 * Handle MRT setsockopt commands to modify the multicast routing tables.
229 */
230 int
231 ip6_mrouter_set(so, sopt)
232 struct socket *so;
233 struct sockopt *sopt;
234 {
235 int error = 0;
236 struct mbuf *m;
237
238 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
239 return (EACCES);
240
241 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
242 return (error);
243 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
244 return (error);
245
246 switch (sopt->sopt_name) {
247 case MRT6_INIT:
248 #if MRT6_OINIT
249 case MRT6_OINIT:
250 #endif
251 error = ip6_mrouter_init(so, m, sopt->sopt_name);
252 break;
253 case MRT6_DONE:
254 error = ip6_mrouter_done();
255 break;
256 case MRT6_ADD_MIF:
257 error = add_m6if(mtod(m, struct mif6ctl *));
258 break;
259 case MRT6_DEL_MIF:
260 error = del_m6if(mtod(m, mifi_t *));
261 break;
262 case MRT6_ADD_MFC:
263 error = add_m6fc(mtod(m, struct mf6cctl *));
264 break;
265 case MRT6_DEL_MFC:
266 error = del_m6fc(mtod(m, struct mf6cctl *));
267 break;
268 case MRT6_PIM:
269 error = set_pim6(mtod(m, int *));
270 break;
271 default:
272 error = EOPNOTSUPP;
273 break;
274 }
275
276 (void)m_freem(m);
277 return(error);
278 }
279
280 /*
281 * Handle MRT getsockopt commands
282 */
283 int
284 ip6_mrouter_get(so, sopt)
285 struct socket *so;
286 struct sockopt *sopt;
287 {
288 int error = 0;
289
290 if (so != ip6_mrouter) return EACCES;
291
292 switch (sopt->sopt_name) {
293 case MRT6_PIM:
294 error = sooptcopyout(sopt, &pim6, sizeof(pim6));
295 break;
296 }
297 return (error);
298 }
299
300 /*
301 * Handle ioctl commands to obtain information from the cache
302 */
303 int
304 mrt6_ioctl(cmd, data)
305 int cmd;
306 caddr_t data;
307 {
308 int error = 0;
309
310 switch (cmd) {
311 case SIOCGETSGCNT_IN6:
312 return(get_sg_cnt((struct sioc_sg_req6 *)data));
313 break; /* for safety */
314 case SIOCGETMIFCNT_IN6:
315 return(get_mif6_cnt((struct sioc_mif_req6 *)data));
316 break; /* for safety */
317 default:
318 return (EINVAL);
319 break;
320 }
321 return error;
322 }
323
324 /*
325 * returns the packet, byte, rpf-failure count for the source group provided
326 */
327 static int
328 get_sg_cnt(req)
329 struct sioc_sg_req6 *req;
330 {
331 struct mf6c *rt;
332 int s;
333
334 s = splnet();
335 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
336 splx(s);
337 if (rt != NULL) {
338 req->pktcnt = rt->mf6c_pkt_cnt;
339 req->bytecnt = rt->mf6c_byte_cnt;
340 req->wrong_if = rt->mf6c_wrong_if;
341 } else
342 return(ESRCH);
343 #if 0
344 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
345 #endif
346
347 return 0;
348 }
349
350 /*
351 * returns the input and output packet and byte counts on the mif provided
352 */
353 static int
354 get_mif6_cnt(req)
355 struct sioc_mif_req6 *req;
356 {
357 mifi_t mifi = req->mifi;
358
359 if (mifi >= nummifs)
360 return EINVAL;
361
362 req->icount = mif6table[mifi].m6_pkt_in;
363 req->ocount = mif6table[mifi].m6_pkt_out;
364 req->ibytes = mif6table[mifi].m6_bytes_in;
365 req->obytes = mif6table[mifi].m6_bytes_out;
366
367 return 0;
368 }
369
370 static int
371 set_pim6(i)
372 int *i;
373 {
374 if ((*i != 1) && (*i != 0))
375 return EINVAL;
376
377 pim6 = *i;
378
379 return 0;
380 }
381
382 /*
383 * Enable multicast routing
384 */
385 static int
386 ip6_mrouter_init(so, m, cmd)
387 struct socket *so;
388 struct mbuf *m;
389 int cmd;
390 {
391 int *v;
392
393 #if MRT6DEBUG
394 if (mrt6debug)
395 log(LOG_DEBUG,
396 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
397 so->so_type, so->so_proto->pr_protocol);
398 #endif
399
400 if (so->so_type != SOCK_RAW ||
401 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
402 return EOPNOTSUPP;
403
404 if (!m || (m->m_len != sizeof(int *)))
405 return ENOPROTOOPT;
406
407 v = mtod(m, int *);
408 if (*v != 1)
409 return ENOPROTOOPT;
410
411 if (ip6_mrouter != NULL) return EADDRINUSE;
412
413 ip6_mrouter = so;
414 ip6_mrouter_ver = cmd;
415
416 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
417 bzero((caddr_t)nexpire, sizeof(nexpire));
418
419 pim6 = 0;/* used for stubbing out/in pim stuff */
420
421 #ifndef __APPLE__
422 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
423 expire_upcalls, NULL);
424 #else
425 timeout(expire_upcalls_funneled, (caddr_t)NULL, EXPIRE_TIMEOUT);
426 #endif
427
428 #if MRT6DEBUG
429 if (mrt6debug)
430 log(LOG_DEBUG, "ip6_mrouter_init\n");
431 #endif
432
433 return 0;
434 }
435
436 /*
437 * Disable multicast routing
438 */
439 int
440 ip6_mrouter_done()
441 {
442 mifi_t mifi;
443 int i;
444 struct ifnet *ifp;
445 struct in6_ifreq ifr;
446 struct mf6c *rt;
447 struct rtdetq *rte;
448 int s;
449
450 s = splnet();
451
452 /*
453 * For each phyint in use, disable promiscuous reception of all IPv6
454 * multicasts.
455 */
456 #if INET
457 #if MROUTING
458 /*
459 * If there is still IPv4 multicast routing daemon,
460 * we remain interfaces to receive all muliticasted packets.
461 * XXX: there may be an interface in which the IPv4 multicast
462 * daemon is not interested...
463 */
464 if (!ip_mrouter)
465 #endif
466 #endif
467 {
468 for (mifi = 0; mifi < nummifs; mifi++) {
469 if (mif6table[mifi].m6_ifp &&
470 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
471 ifr.ifr_addr.sin6_family = AF_INET6;
472 ifr.ifr_addr.sin6_addr= in6addr_any;
473 ifp = mif6table[mifi].m6_ifp;
474 #ifdef __APPLE__
475 dlil_ioctl(0, ifp, SIOCDELMULTI,
476 (caddr_t)&ifr);
477 #else
478 (*ifp->if_ioctl)(ifp, SIOCDELMULTI,
479 (caddr_t)&ifr);
480 #endif
481 }
482 }
483 }
484 #if notyet
485 bzero((caddr_t)qtable, sizeof(qtable));
486 bzero((caddr_t)tbftable, sizeof(tbftable));
487 #endif
488 bzero((caddr_t)mif6table, sizeof(mif6table));
489 nummifs = 0;
490
491 pim6 = 0; /* used to stub out/in pim specific code */
492
493 #ifndef __APPLE__
494 callout_stop(&expire_upcalls_ch);
495 #else
496 untimeout(expire_upcalls_funneled, (caddr_t)NULL);
497 #endif
498
499 /*
500 * Free all multicast forwarding cache entries.
501 */
502 for (i = 0; i < MF6CTBLSIZ; i++) {
503 rt = mf6ctable[i];
504 while (rt) {
505 struct mf6c *frt;
506
507 for (rte = rt->mf6c_stall; rte != NULL; ) {
508 struct rtdetq *n = rte->next;
509
510 m_free(rte->m);
511 FREE(rte, M_MRTABLE);
512 rte = n;
513 }
514 frt = rt;
515 rt = rt->mf6c_next;
516 FREE(frt, M_MRTABLE);
517 }
518 }
519
520 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
521
522 /*
523 * Reset de-encapsulation cache
524 */
525 reg_mif_num = -1;
526
527 ip6_mrouter = NULL;
528 ip6_mrouter_ver = 0;
529
530 splx(s);
531
532 #if MRT6DEBUG
533 if (mrt6debug)
534 log(LOG_DEBUG, "ip6_mrouter_done\n");
535 #endif
536
537 return 0;
538 }
539
540 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
541
542 /*
543 * Add a mif to the mif table
544 */
545 static int
546 add_m6if(mifcp)
547 struct mif6ctl *mifcp;
548 {
549 struct mif6 *mifp;
550 struct ifnet *ifp;
551 int error, s;
552 #if notyet
553 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
554 #endif
555
556 if (mifcp->mif6c_mifi >= MAXMIFS)
557 return EINVAL;
558 mifp = mif6table + mifcp->mif6c_mifi;
559 if (mifp->m6_ifp)
560 return EADDRINUSE; /* XXX: is it appropriate? */
561 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
562 return ENXIO;
563 ifp = ifindex2ifnet[mifcp->mif6c_pifi];
564
565 if (mifcp->mif6c_flags & MIFF_REGISTER) {
566 if (reg_mif_num == (mifi_t)-1) {
567 multicast_register_if.if_name = "register_mif";
568 multicast_register_if.if_flags |= IFF_LOOPBACK;
569 multicast_register_if.if_index = mifcp->mif6c_mifi;
570 reg_mif_num = mifcp->mif6c_mifi;
571 }
572
573 ifp = &multicast_register_if;
574
575 } /* if REGISTER */
576 else {
577 /* Make sure the interface supports multicast */
578 if ((ifp->if_flags & IFF_MULTICAST) == 0)
579 return EOPNOTSUPP;
580
581 s = splnet();
582 error = if_allmulti(ifp, 1);
583 splx(s);
584 if (error)
585 return error;
586 }
587
588 s = splnet();
589 mifp->m6_flags = mifcp->mif6c_flags;
590 mifp->m6_ifp = ifp;
591 #if notyet
592 /* scaling up here allows division by 1024 in critical code */
593 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
594 #endif
595 /* initialize per mif pkt counters */
596 mifp->m6_pkt_in = 0;
597 mifp->m6_pkt_out = 0;
598 mifp->m6_bytes_in = 0;
599 mifp->m6_bytes_out = 0;
600 splx(s);
601
602 /* Adjust nummifs up if the mifi is higher than nummifs */
603 if (nummifs <= mifcp->mif6c_mifi)
604 nummifs = mifcp->mif6c_mifi + 1;
605
606 #if MRT6DEBUG
607 if (mrt6debug)
608 log(LOG_DEBUG,
609 "add_mif #%d, phyint %s%d\n",
610 mifcp->mif6c_mifi,
611 ifp->if_name, ifp->if_unit);
612 #endif
613
614 return 0;
615 }
616
617 /*
618 * Delete a mif from the mif table
619 */
620 static int
621 del_m6if(mifip)
622 mifi_t *mifip;
623 {
624 struct mif6 *mifp = mif6table + *mifip;
625 mifi_t mifi;
626 struct ifnet *ifp;
627 int s;
628
629 if (*mifip >= nummifs)
630 return EINVAL;
631 if (mifp->m6_ifp == NULL)
632 return EINVAL;
633
634 s = splnet();
635
636 if (!(mifp->m6_flags & MIFF_REGISTER)) {
637 /*
638 * XXX: what if there is yet IPv4 multicast daemon
639 * using the interface?
640 */
641 ifp = mifp->m6_ifp;
642
643 if_allmulti(ifp, 0);
644 }
645
646 #if notyet
647 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
648 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
649 #endif
650 bzero((caddr_t)mifp, sizeof (*mifp));
651
652 /* Adjust nummifs down */
653 for (mifi = nummifs; mifi > 0; mifi--)
654 if (mif6table[mifi - 1].m6_ifp)
655 break;
656 nummifs = mifi;
657
658 splx(s);
659
660 #if MRT6DEBUG
661 if (mrt6debug)
662 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
663 #endif
664
665 return 0;
666 }
667
668 /*
669 * Add an mfc entry
670 */
671 static int
672 add_m6fc(mfccp)
673 struct mf6cctl *mfccp;
674 {
675 struct mf6c *rt;
676 u_long hash;
677 struct rtdetq *rte;
678 u_short nstl;
679 int s;
680
681 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
682 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
683
684 /* If an entry already exists, just update the fields */
685 if (rt) {
686 #if MRT6DEBUG
687 if (mrt6debug & DEBUG_MFC)
688 log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n",
689 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
690 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
691 mfccp->mf6cc_parent);
692 #endif
693
694 s = splnet();
695 rt->mf6c_parent = mfccp->mf6cc_parent;
696 rt->mf6c_ifset = mfccp->mf6cc_ifset;
697 splx(s);
698 return 0;
699 }
700
701 /*
702 * Find the entry for which the upcall was made and update
703 */
704 s = splnet();
705 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
706 mfccp->mf6cc_mcastgrp.sin6_addr);
707 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
708 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
709 &mfccp->mf6cc_origin.sin6_addr) &&
710 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
711 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
712 (rt->mf6c_stall != NULL)) {
713
714 if (nstl++)
715 log(LOG_ERR,
716 "add_m6fc: %s o %s g %s p %x dbx %p\n",
717 "multiple kernel entries",
718 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
719 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
720 mfccp->mf6cc_parent, rt->mf6c_stall);
721
722 #if MRT6DEBUG
723 if (mrt6debug & DEBUG_MFC)
724 log(LOG_DEBUG,
725 "add_m6fc o %s g %s p %x dbg %x\n",
726 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
727 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
728 mfccp->mf6cc_parent, rt->mf6c_stall);
729 #endif
730
731 rt->mf6c_origin = mfccp->mf6cc_origin;
732 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
733 rt->mf6c_parent = mfccp->mf6cc_parent;
734 rt->mf6c_ifset = mfccp->mf6cc_ifset;
735 /* initialize pkt counters per src-grp */
736 rt->mf6c_pkt_cnt = 0;
737 rt->mf6c_byte_cnt = 0;
738 rt->mf6c_wrong_if = 0;
739
740 rt->mf6c_expire = 0; /* Don't clean this guy up */
741 nexpire[hash]--;
742
743 /* free packets Qed at the end of this entry */
744 for (rte = rt->mf6c_stall; rte != NULL; ) {
745 struct rtdetq *n = rte->next;
746 ip6_mdq(rte->m, rte->ifp, rt);
747 m_freem(rte->m);
748 #if UPCALL_TIMING
749 collate(&(rte->t));
750 #endif /* UPCALL_TIMING */
751 FREE(rte, M_MRTABLE);
752 rte = n;
753 }
754 rt->mf6c_stall = NULL;
755 }
756 }
757
758 /*
759 * It is possible that an entry is being inserted without an upcall
760 */
761 if (nstl == 0) {
762 #if MRT6DEBUG
763 if (mrt6debug & DEBUG_MFC)
764 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n",
765 hash,
766 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
767 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
768 mfccp->mf6cc_parent);
769 #endif
770
771 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
772
773 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
774 &mfccp->mf6cc_origin.sin6_addr)&&
775 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
776 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
777
778 rt->mf6c_origin = mfccp->mf6cc_origin;
779 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
780 rt->mf6c_parent = mfccp->mf6cc_parent;
781 rt->mf6c_ifset = mfccp->mf6cc_ifset;
782 /* initialize pkt counters per src-grp */
783 rt->mf6c_pkt_cnt = 0;
784 rt->mf6c_byte_cnt = 0;
785 rt->mf6c_wrong_if = 0;
786
787 if (rt->mf6c_expire)
788 nexpire[hash]--;
789 rt->mf6c_expire = 0;
790 }
791 }
792 if (rt == NULL) {
793 /* no upcall, so make a new entry */
794 rt = (struct mf6c *)_MALLOC(sizeof(*rt), M_MRTABLE,
795 M_NOWAIT);
796 if (rt == NULL) {
797 splx(s);
798 return ENOBUFS;
799 }
800
801 /* insert new entry at head of hash chain */
802 rt->mf6c_origin = mfccp->mf6cc_origin;
803 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
804 rt->mf6c_parent = mfccp->mf6cc_parent;
805 rt->mf6c_ifset = mfccp->mf6cc_ifset;
806 /* initialize pkt counters per src-grp */
807 rt->mf6c_pkt_cnt = 0;
808 rt->mf6c_byte_cnt = 0;
809 rt->mf6c_wrong_if = 0;
810 rt->mf6c_expire = 0;
811 rt->mf6c_stall = NULL;
812
813 /* link into table */
814 rt->mf6c_next = mf6ctable[hash];
815 mf6ctable[hash] = rt;
816 }
817 }
818 splx(s);
819 return 0;
820 }
821
822 #if UPCALL_TIMING
823 /*
824 * collect delay statistics on the upcalls
825 */
826 static void
827 collate(t)
828 struct timeval *t;
829 {
830 u_long d;
831 struct timeval tp;
832 u_long delta;
833
834 GET_TIME(tp);
835
836 if (TV_LT(*t, tp))
837 {
838 TV_DELTA(tp, *t, delta);
839
840 d = delta >> 10;
841 if (d > UPCALL_MAX)
842 d = UPCALL_MAX;
843
844 ++upcall_data[d];
845 }
846 }
847 #endif /* UPCALL_TIMING */
848
849 /*
850 * Delete an mfc entry
851 */
852 static int
853 del_m6fc(mfccp)
854 struct mf6cctl *mfccp;
855 {
856 struct sockaddr_in6 origin;
857 struct sockaddr_in6 mcastgrp;
858 struct mf6c *rt;
859 struct mf6c **nptr;
860 u_long hash;
861 int s;
862
863 origin = mfccp->mf6cc_origin;
864 mcastgrp = mfccp->mf6cc_mcastgrp;
865 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
866
867 #if MRT6DEBUG
868 if (mrt6debug & DEBUG_MFC)
869 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
870 ip6_sprintf(&origin.sin6_addr),
871 ip6_sprintf(&mcastgrp.sin6_addr));
872 #endif
873
874 s = splnet();
875
876 nptr = &mf6ctable[hash];
877 while ((rt = *nptr) != NULL) {
878 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
879 &rt->mf6c_origin.sin6_addr) &&
880 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
881 &rt->mf6c_mcastgrp.sin6_addr) &&
882 rt->mf6c_stall == NULL)
883 break;
884
885 nptr = &rt->mf6c_next;
886 }
887 if (rt == NULL) {
888 splx(s);
889 return EADDRNOTAVAIL;
890 }
891
892 *nptr = rt->mf6c_next;
893 FREE(rt, M_MRTABLE);
894
895 splx(s);
896
897 return 0;
898 }
899
900 static int
901 socket_send(s, mm, src)
902 struct socket *s;
903 struct mbuf *mm;
904 struct sockaddr_in6 *src;
905 {
906 if (s) {
907 if (sbappendaddr(&s->so_rcv,
908 (struct sockaddr *)src,
909 mm, (struct mbuf *)0) != 0) {
910 sorwakeup(s);
911 return 0;
912 }
913 }
914 m_freem(mm);
915 return -1;
916 }
917
918 /*
919 * IPv6 multicast forwarding function. This function assumes that the packet
920 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
921 * pointed to by "ifp", and the packet is to be relayed to other networks
922 * that have members of the packet's destination IPv6 multicast group.
923 *
924 * The packet is returned unscathed to the caller, unless it is
925 * erroneous, in which case a non-zero return value tells the caller to
926 * discard it.
927 */
928
929 int
930 ip6_mforward(ip6, ifp, m)
931 struct ip6_hdr *ip6;
932 struct ifnet *ifp;
933 struct mbuf *m;
934 {
935 struct mf6c *rt;
936 struct mif6 *mifp;
937 struct mbuf *mm;
938 int s;
939 mifi_t mifi;
940
941 #if MRT6DEBUG
942 if (mrt6debug & DEBUG_FORWARD)
943 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
944 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
945 ifp->if_index);
946 #endif
947
948 /*
949 * Don't forward a packet with Hop limit of zero or one,
950 * or a packet destined to a local-only group.
951 */
952 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) ||
953 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
954 return 0;
955 ip6->ip6_hlim--;
956
957 /*
958 * Source address check: do not forward packets with unspecified
959 * source. It was discussed in July 2000, on ipngwg mailing list.
960 * This is rather more serious than unicast cases, because some
961 * MLD packets can be sent with the unspecified source address
962 * (although such packets must normally set 1 to the hop limit field).
963 */
964 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
965 ip6stat.ip6s_cantforward++;
966 if (ip6_log_time + ip6_log_interval < time_second) {
967 ip6_log_time = time_second;
968 log(LOG_DEBUG,
969 "cannot forward "
970 "from %s to %s nxt %d received on %s\n",
971 ip6_sprintf(&ip6->ip6_src),
972 ip6_sprintf(&ip6->ip6_dst),
973 ip6->ip6_nxt,
974 if_name(m->m_pkthdr.rcvif));
975 }
976 return 0;
977 }
978
979 /*
980 * Determine forwarding mifs from the forwarding cache table
981 */
982 s = splnet();
983 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
984
985 /* Entry exists, so forward if necessary */
986 if (rt) {
987 splx(s);
988 return (ip6_mdq(m, ifp, rt));
989 } else {
990 /*
991 * If we don't have a route for packet's origin,
992 * Make a copy of the packet &
993 * send message to routing daemon
994 */
995
996 struct mbuf *mb0;
997 struct rtdetq *rte;
998 u_long hash;
999 /* int i, npkts;*/
1000 #if UPCALL_TIMING
1001 struct timeval tp;
1002
1003 GET_TIME(tp);
1004 #endif /* UPCALL_TIMING */
1005
1006 mrt6stat.mrt6s_no_route++;
1007 #if MRT6DEBUG
1008 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1009 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1010 ip6_sprintf(&ip6->ip6_src),
1011 ip6_sprintf(&ip6->ip6_dst));
1012 #endif
1013
1014 /*
1015 * Allocate mbufs early so that we don't do extra work if we
1016 * are just going to fail anyway.
1017 */
1018 rte = (struct rtdetq *)_MALLOC(sizeof(*rte), M_MRTABLE,
1019 M_NOWAIT);
1020 if (rte == NULL) {
1021 splx(s);
1022 return ENOBUFS;
1023 }
1024 mb0 = m_copy(m, 0, M_COPYALL);
1025 /*
1026 * Pullup packet header if needed before storing it,
1027 * as other references may modify it in the meantime.
1028 */
1029 if (mb0 &&
1030 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1031 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1032 if (mb0 == NULL) {
1033 FREE(rte, M_MRTABLE);
1034 splx(s);
1035 return ENOBUFS;
1036 }
1037
1038 /* is there an upcall waiting for this packet? */
1039 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1040 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1041 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1042 &rt->mf6c_origin.sin6_addr) &&
1043 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1044 &rt->mf6c_mcastgrp.sin6_addr) &&
1045 (rt->mf6c_stall != NULL))
1046 break;
1047 }
1048
1049 if (rt == NULL) {
1050 struct mrt6msg *im;
1051 #if MRT6_OINIT
1052 struct omrt6msg *oim;
1053 #endif
1054
1055 /* no upcall, so make a new entry */
1056 rt = (struct mf6c *)_MALLOC(sizeof(*rt), M_MRTABLE,
1057 M_NOWAIT);
1058 if (rt == NULL) {
1059 FREE(rte, M_MRTABLE);
1060 m_freem(mb0);
1061 splx(s);
1062 return ENOBUFS;
1063 }
1064 /*
1065 * Make a copy of the header to send to the user
1066 * level process
1067 */
1068 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1069
1070 if (mm == NULL) {
1071 FREE(rte, M_MRTABLE);
1072 m_freem(mb0);
1073 FREE(rt, M_MRTABLE);
1074 splx(s);
1075 return ENOBUFS;
1076 }
1077
1078 /*
1079 * Send message to routing daemon
1080 */
1081 sin6.sin6_addr = ip6->ip6_src;
1082
1083 im = NULL;
1084 #if MRT6_OINIT
1085 oim = NULL;
1086 #endif
1087 switch (ip6_mrouter_ver) {
1088 #if MRT6_OINIT
1089 case MRT6_OINIT:
1090 oim = mtod(mm, struct omrt6msg *);
1091 oim->im6_msgtype = MRT6MSG_NOCACHE;
1092 oim->im6_mbz = 0;
1093 break;
1094 #endif
1095 case MRT6_INIT:
1096 im = mtod(mm, struct mrt6msg *);
1097 im->im6_msgtype = MRT6MSG_NOCACHE;
1098 im->im6_mbz = 0;
1099 break;
1100 default:
1101 FREE(rte, M_MRTABLE);
1102 m_freem(mb0);
1103 FREE(rt, M_MRTABLE);
1104 splx(s);
1105 return EINVAL;
1106 }
1107
1108 #if MRT6DEBUG
1109 if (mrt6debug & DEBUG_FORWARD)
1110 log(LOG_DEBUG,
1111 "getting the iif info in the kernel\n");
1112 #endif
1113
1114 for (mifp = mif6table, mifi = 0;
1115 mifi < nummifs && mifp->m6_ifp != ifp;
1116 mifp++, mifi++)
1117 ;
1118
1119 switch (ip6_mrouter_ver) {
1120 #if MRT6_OINIT
1121 case MRT6_OINIT:
1122 oim->im6_mif = mifi;
1123 break;
1124 #endif
1125 case MRT6_INIT:
1126 im->im6_mif = mifi;
1127 break;
1128 }
1129
1130 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1131 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1132 "socket queue full\n");
1133 mrt6stat.mrt6s_upq_sockfull++;
1134 FREE(rte, M_MRTABLE);
1135 m_freem(mb0);
1136 FREE(rt, M_MRTABLE);
1137 splx(s);
1138 return ENOBUFS;
1139 }
1140
1141 mrt6stat.mrt6s_upcalls++;
1142
1143 /* insert new entry at head of hash chain */
1144 bzero(rt, sizeof(*rt));
1145 rt->mf6c_origin.sin6_family = AF_INET6;
1146 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1147 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1148 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1149 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1150 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1151 rt->mf6c_expire = UPCALL_EXPIRE;
1152 nexpire[hash]++;
1153 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1154
1155 /* link into table */
1156 rt->mf6c_next = mf6ctable[hash];
1157 mf6ctable[hash] = rt;
1158 /* Add this entry to the end of the queue */
1159 rt->mf6c_stall = rte;
1160 } else {
1161 /* determine if q has overflowed */
1162 struct rtdetq **p;
1163 int npkts = 0;
1164
1165 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1166 if (++npkts > MAX_UPQ6) {
1167 mrt6stat.mrt6s_upq_ovflw++;
1168 FREE(rte, M_MRTABLE);
1169 m_freem(mb0);
1170 splx(s);
1171 return 0;
1172 }
1173
1174 /* Add this entry to the end of the queue */
1175 *p = rte;
1176 }
1177
1178 rte->next = NULL;
1179 rte->m = mb0;
1180 rte->ifp = ifp;
1181 #if UPCALL_TIMING
1182 rte->t = tp;
1183 #endif /* UPCALL_TIMING */
1184
1185 splx(s);
1186
1187 return 0;
1188 }
1189 }
1190
1191 static void
1192 expire_upcalls_funneled(unused)
1193 void *unused;
1194 {
1195 #ifdef __APPLE__
1196 boolean_t funnel_state;
1197 funnel_state = thread_funnel_set(network_flock, TRUE);
1198 #endif
1199 expire_upcalls(unused);
1200 #ifdef __APPLE__
1201 (void) thread_funnel_set(network_flock, FALSE);
1202 #endif
1203 }
1204
1205 /*
1206 * Clean up cache entries if upcalls are not serviced
1207 * Call from the Slow Timeout mechanism, every half second.
1208 */
1209 static void
1210 expire_upcalls(unused)
1211 void *unused;
1212 {
1213 struct rtdetq *rte;
1214 struct mf6c *mfc, **nptr;
1215 int i;
1216 int s;
1217
1218 s = splnet();
1219 for (i = 0; i < MF6CTBLSIZ; i++) {
1220 if (nexpire[i] == 0)
1221 continue;
1222 nptr = &mf6ctable[i];
1223 while ((mfc = *nptr) != NULL) {
1224 rte = mfc->mf6c_stall;
1225 /*
1226 * Skip real cache entries
1227 * Make sure it wasn't marked to not expire (shouldn't happen)
1228 * If it expires now
1229 */
1230 if (rte != NULL &&
1231 mfc->mf6c_expire != 0 &&
1232 --mfc->mf6c_expire == 0) {
1233 #if MRT6DEBUG
1234 if (mrt6debug & DEBUG_EXPIRE)
1235 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1236 ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
1237 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
1238 #endif
1239 /*
1240 * drop all the packets
1241 * free the mbuf with the pkt, if, timing info
1242 */
1243 do {
1244 struct rtdetq *n = rte->next;
1245 m_freem(rte->m);
1246 FREE(rte, M_MRTABLE);
1247 rte = n;
1248 } while (rte != NULL);
1249 mrt6stat.mrt6s_cache_cleanups++;
1250 nexpire[i]--;
1251
1252 *nptr = mfc->mf6c_next;
1253 FREE(mfc, M_MRTABLE);
1254 } else {
1255 nptr = &mfc->mf6c_next;
1256 }
1257 }
1258 }
1259 splx(s);
1260
1261 #ifndef __APPLE__
1262 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1263 expire_upcalls, NULL);
1264 #else
1265 timeout(expire_upcalls_funneled, (caddr_t)NULL, EXPIRE_TIMEOUT);
1266 #endif
1267 }
1268
1269 /*
1270 * Packet forwarding routine once entry in the cache is made
1271 */
1272 static int
1273 ip6_mdq(m, ifp, rt)
1274 struct mbuf *m;
1275 struct ifnet *ifp;
1276 struct mf6c *rt;
1277 {
1278 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1279 mifi_t mifi, iif;
1280 struct mif6 *mifp;
1281 int plen = m->m_pkthdr.len;
1282
1283 /*
1284 * Macro to send packet on mif. Since RSVP packets don't get counted on
1285 * input, they shouldn't get counted on output, so statistics keeping is
1286 * seperate.
1287 */
1288
1289 #define MC6_SEND(ip6, mifp, m) do { \
1290 if ((mifp)->m6_flags & MIFF_REGISTER) \
1291 register_send((ip6), (mifp), (m)); \
1292 else \
1293 phyint_send((ip6), (mifp), (m)); \
1294 } while (0)
1295
1296 /*
1297 * Don't forward if it didn't arrive from the parent mif
1298 * for its origin.
1299 */
1300 mifi = rt->mf6c_parent;
1301 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1302 /* came in the wrong interface */
1303 #if MRT6DEBUG
1304 if (mrt6debug & DEBUG_FORWARD)
1305 log(LOG_DEBUG,
1306 "wrong if: ifid %d mifi %d mififid %x\n",
1307 ifp->if_index, mifi,
1308 mif6table[mifi].m6_ifp->if_index);
1309 #endif
1310 mrt6stat.mrt6s_wrong_if++;
1311 rt->mf6c_wrong_if++;
1312 /*
1313 * If we are doing PIM processing, and we are forwarding
1314 * packets on this interface, send a message to the
1315 * routing daemon.
1316 */
1317 /* have to make sure this is a valid mif */
1318 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1319 if (pim6 && (m->m_flags & M_LOOP) == 0) {
1320 /*
1321 * Check the M_LOOP flag to avoid an
1322 * unnecessary PIM assert.
1323 * XXX: M_LOOP is an ad-hoc hack...
1324 */
1325 static struct sockaddr_in6 sin6 =
1326 { sizeof(sin6), AF_INET6 };
1327
1328 struct mbuf *mm;
1329 struct mrt6msg *im;
1330 #if MRT6_OINIT
1331 struct omrt6msg *oim;
1332 #endif
1333
1334 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1335 if (mm &&
1336 (M_HASCL(mm) ||
1337 mm->m_len < sizeof(struct ip6_hdr)))
1338 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1339 if (mm == NULL)
1340 return ENOBUFS;
1341
1342 #if MRT6_OINIT
1343 oim = NULL;
1344 #endif
1345 im = NULL;
1346 switch (ip6_mrouter_ver) {
1347 #if MRT6_OINIT
1348 case MRT6_OINIT:
1349 oim = mtod(mm, struct omrt6msg *);
1350 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1351 oim->im6_mbz = 0;
1352 break;
1353 #endif
1354 case MRT6_INIT:
1355 im = mtod(mm, struct mrt6msg *);
1356 im->im6_msgtype = MRT6MSG_WRONGMIF;
1357 im->im6_mbz = 0;
1358 break;
1359 default:
1360 m_freem(mm);
1361 return EINVAL;
1362 }
1363
1364 for (mifp = mif6table, iif = 0;
1365 iif < nummifs && mifp &&
1366 mifp->m6_ifp != ifp;
1367 mifp++, iif++)
1368 ;
1369
1370 switch (ip6_mrouter_ver) {
1371 #if MRT6_OINIT
1372 case MRT6_OINIT:
1373 oim->im6_mif = iif;
1374 sin6.sin6_addr = oim->im6_src;
1375 break;
1376 #endif
1377 case MRT6_INIT:
1378 im->im6_mif = iif;
1379 sin6.sin6_addr = im->im6_src;
1380 break;
1381 }
1382
1383 mrt6stat.mrt6s_upcalls++;
1384
1385 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1386 #if MRT6DEBUG
1387 if (mrt6debug)
1388 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1389 #endif
1390 ++mrt6stat.mrt6s_upq_sockfull;
1391 return ENOBUFS;
1392 } /* if socket Q full */
1393 } /* if PIM */
1394 return 0;
1395 } /* if wrong iif */
1396
1397 /* If I sourced this packet, it counts as output, else it was input. */
1398 if (m->m_pkthdr.rcvif == NULL) {
1399 /* XXX: is rcvif really NULL when output?? */
1400 mif6table[mifi].m6_pkt_out++;
1401 mif6table[mifi].m6_bytes_out += plen;
1402 } else {
1403 mif6table[mifi].m6_pkt_in++;
1404 mif6table[mifi].m6_bytes_in += plen;
1405 }
1406 rt->mf6c_pkt_cnt++;
1407 rt->mf6c_byte_cnt += plen;
1408
1409 /*
1410 * For each mif, forward a copy of the packet if there are group
1411 * members downstream on the interface.
1412 */
1413 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++)
1414 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1415 /*
1416 * check if the outgoing packet is going to break
1417 * a scope boundary.
1418 * XXX For packets through PIM register tunnel
1419 * interface, we believe a routing daemon.
1420 */
1421 if ((mif6table[rt->mf6c_parent].m6_flags &
1422 MIFF_REGISTER) == 0 &&
1423 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 &&
1424 (in6_addr2scopeid(ifp, &ip6->ip6_dst) !=
1425 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1426 &ip6->ip6_dst) ||
1427 in6_addr2scopeid(ifp, &ip6->ip6_src) !=
1428 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1429 &ip6->ip6_src))) {
1430 ip6stat.ip6s_badscope++;
1431 continue;
1432 }
1433
1434 mifp->m6_pkt_out++;
1435 mifp->m6_bytes_out += plen;
1436 MC6_SEND(ip6, mifp, m);
1437 }
1438 return 0;
1439 }
1440
1441 static void
1442 phyint_send(ip6, mifp, m)
1443 struct ip6_hdr *ip6;
1444 struct mif6 *mifp;
1445 struct mbuf *m;
1446 {
1447 struct mbuf *mb_copy;
1448 struct ifnet *ifp = mifp->m6_ifp;
1449 int error = 0;
1450 int s = splnet(); /* needs to protect static "ro" below. */
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 splx(s);
1466 return;
1467 }
1468 /* set MCAST flag to the outgoing packet */
1469 mb_copy->m_flags |= M_MCAST;
1470
1471 /*
1472 * If we sourced the packet, call ip6_output since we may devide
1473 * the packet into fragments when the packet is too big for the
1474 * outgoing interface.
1475 * Otherwise, we can simply send the packet to the interface
1476 * sending queue.
1477 */
1478 if (m->m_pkthdr.rcvif == NULL) {
1479 struct ip6_moptions im6o;
1480
1481 im6o.im6o_multicast_ifp = ifp;
1482 /* XXX: ip6_output will override ip6->ip6_hlim */
1483 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1484 im6o.im6o_multicast_loop = 1;
1485 error = ip6_output(mb_copy, NULL, &ro,
1486 IPV6_FORWARDING, &im6o, NULL);
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 splx(s);
1494 return;
1495 }
1496
1497 /*
1498 * If we belong to the destination multicast group
1499 * on the outgoing interface, loop back a copy.
1500 */
1501 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
1502 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1503 if (in6m != NULL) {
1504 dst6->sin6_len = sizeof(struct sockaddr_in6);
1505 dst6->sin6_family = AF_INET6;
1506 dst6->sin6_addr = ip6->ip6_dst;
1507 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
1508 }
1509 /*
1510 * Put the packet into the sending queue of the outgoing interface
1511 * if it would fit in the MTU of the interface.
1512 */
1513 if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) {
1514 dst6->sin6_len = sizeof(struct sockaddr_in6);
1515 dst6->sin6_family = AF_INET6;
1516 dst6->sin6_addr = ip6->ip6_dst;
1517 /*
1518 * We just call if_output instead of nd6_output here, since
1519 * we need no ND for a multicast forwarded packet...right?
1520 */
1521 #ifdef __APPLE__
1522 /* Make sure the HW checksum flags are cleaned before sending the packet */
1523
1524 mb_copy->m_pkthdr.rcvif = (struct ifnet *)0;
1525 mb_copy->m_pkthdr.csum_data = 0;
1526 mb_copy->m_pkthdr.csum_flags = 0;
1527
1528 error = dlil_output(ifptodlt(ifp, PF_INET6), mb_copy,
1529 NULL, (struct sockaddr *)&ro.ro_dst, 0);
1530 #else
1531 error = (*ifp->if_output)(ifp, mb_copy,
1532 (struct sockaddr *)&ro.ro_dst,
1533 NULL);
1534 #endif
1535 #if MRT6DEBUG
1536 if (mrt6debug & DEBUG_XMIT)
1537 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1538 mifp - mif6table, error);
1539 #endif
1540 } else {
1541 #if MULTICAST_PMTUD
1542 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
1543 #else
1544 #if MRT6DEBUG
1545 if (mrt6debug & DEBUG_XMIT)
1546 log(LOG_DEBUG,
1547 "phyint_send: packet too big on %s o %s g %s"
1548 " size %d(discarded)\n",
1549 if_name(ifp),
1550 ip6_sprintf(&ip6->ip6_src),
1551 ip6_sprintf(&ip6->ip6_dst),
1552 mb_copy->m_pkthdr.len);
1553 #endif /* MRT6DEBUG */
1554 m_freem(mb_copy); /* simply discard the packet */
1555 #endif
1556 }
1557
1558 splx(s);
1559 }
1560
1561 static int
1562 register_send(ip6, mif, m)
1563 struct ip6_hdr *ip6;
1564 struct mif6 *mif;
1565 struct mbuf *m;
1566 {
1567 struct mbuf *mm;
1568 int i, len = m->m_pkthdr.len;
1569 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
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 mm->m_pkthdr.rcvif = NULL;
1584 mm->m_data += max_linkhdr;
1585 mm->m_len = sizeof(struct ip6_hdr);
1586
1587 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1588 m_freem(mm);
1589 return ENOBUFS;
1590 }
1591 i = MHLEN - M_LEADINGSPACE(mm);
1592 if (i > len)
1593 i = len;
1594 mm = m_pullup(mm, i);
1595 if (mm == NULL){
1596 m_freem(mm);
1597 return ENOBUFS;
1598 }
1599 /* TODO: check it! */
1600 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1601
1602 /*
1603 * Send message to routing daemon
1604 */
1605 sin6.sin6_addr = ip6->ip6_src;
1606
1607 im6 = mtod(mm, struct mrt6msg *);
1608 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1609 im6->im6_mbz = 0;
1610
1611 im6->im6_mif = mif - mif6table;
1612
1613 /* iif info is not given for reg. encap.n */
1614 mrt6stat.mrt6s_upcalls++;
1615
1616 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1617 #if MRT6DEBUG
1618 if (mrt6debug)
1619 log(LOG_WARNING,
1620 "register_send: ip_mrouter socket queue full\n");
1621 #endif
1622 ++mrt6stat.mrt6s_upq_sockfull;
1623 return ENOBUFS;
1624 }
1625 return 0;
1626 }
1627
1628 /*
1629 * PIM sparse mode hook
1630 * Receives the pim control messages, and passes them up to the listening
1631 * socket, using rip6_input.
1632 * The only message processed is the REGISTER pim message; the pim header
1633 * is stripped off, and the inner packet is passed to register_mforward.
1634 */
1635 int
1636 pim6_input(mp, offp)
1637 struct mbuf **mp;
1638 int *offp;
1639 {
1640 struct pim *pim; /* pointer to a pim struct */
1641 struct ip6_hdr *ip6;
1642 int pimlen;
1643 struct mbuf *m = *mp;
1644 int minlen;
1645 int off = *offp;
1646 int proto;
1647
1648 ++pim6stat.pim6s_rcv_total;
1649
1650 ip6 = mtod(m, struct ip6_hdr *);
1651 pimlen = m->m_pkthdr.len - *offp;
1652 proto = ip6->ip6_nxt;
1653
1654 /*
1655 * Validate lengths
1656 */
1657 if (pimlen < PIM_MINLEN) {
1658 ++pim6stat.pim6s_rcv_tooshort;
1659 #if MRT6DEBUG
1660 if (mrt6debug & DEBUG_PIM)
1661 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1662 #endif
1663 m_freem(m);
1664 return(IPPROTO_DONE);
1665 }
1666
1667 /*
1668 * if the packet is at least as big as a REGISTER, go ahead
1669 * and grab the PIM REGISTER header size, to avoid another
1670 * possible m_pullup() later.
1671 *
1672 * PIM_MINLEN == pimhdr + u_int32 == 8
1673 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1674 */
1675 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1676
1677 /*
1678 * Make sure that the IP6 and PIM headers in contiguous memory, and
1679 * possibly the PIM REGISTER header
1680 */
1681 #ifndef PULLDOWN_TEST
1682 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1683 /* adjust pointer */
1684 ip6 = mtod(m, struct ip6_hdr *);
1685
1686 /* adjust mbuf to point to the PIM header */
1687 pim = (struct pim *)((caddr_t)ip6 + off);
1688 #else
1689 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1690 if (pim == NULL) {
1691 pim6stat.pim6s_rcv_tooshort++;
1692 return IPPROTO_DONE;
1693 }
1694 #endif
1695
1696 #define PIM6_CHECKSUM
1697 #ifdef PIM6_CHECKSUM
1698 {
1699 int cksumlen;
1700
1701 /*
1702 * Validate checksum.
1703 * If PIM REGISTER, exclude the data packet
1704 */
1705 if (pim->pim_type == PIM_REGISTER)
1706 cksumlen = PIM_MINLEN;
1707 else
1708 cksumlen = pimlen;
1709
1710 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1711 ++pim6stat.pim6s_rcv_badsum;
1712 #if MRT6DEBUG
1713 if (mrt6debug & DEBUG_PIM)
1714 log(LOG_DEBUG,
1715 "pim6_input: invalid checksum\n");
1716 #endif
1717 m_freem(m);
1718 return(IPPROTO_DONE);
1719 }
1720 }
1721 #endif /* PIM_CHECKSUM */
1722
1723 /* PIM version check */
1724 if (pim->pim_ver != PIM_VERSION) {
1725 ++pim6stat.pim6s_rcv_badversion;
1726 #if MRT6DEBUG
1727 log(LOG_ERR,
1728 "pim6_input: incorrect version %d, expecting %d\n",
1729 pim->pim_ver, PIM_VERSION);
1730 #endif
1731 m_freem(m);
1732 return(IPPROTO_DONE);
1733 }
1734
1735 if (pim->pim_type == PIM_REGISTER) {
1736 /*
1737 * since this is a REGISTER, we'll make a copy of the register
1738 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1739 * routing daemon.
1740 */
1741 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1742
1743 struct mbuf *mcp;
1744 struct ip6_hdr *eip6;
1745 u_int32_t *reghdr;
1746 int rc;
1747
1748 ++pim6stat.pim6s_rcv_registers;
1749
1750 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1751 #if MRT6DEBUG
1752 if (mrt6debug & DEBUG_PIM)
1753 log(LOG_DEBUG,
1754 "pim6_input: register mif not set: %d\n",
1755 reg_mif_num);
1756 #endif
1757 m_freem(m);
1758 return(IPPROTO_DONE);
1759 }
1760
1761 reghdr = (u_int32_t *)(pim + 1);
1762
1763 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1764 goto pim6_input_to_daemon;
1765
1766 /*
1767 * Validate length
1768 */
1769 if (pimlen < PIM6_REG_MINLEN) {
1770 ++pim6stat.pim6s_rcv_tooshort;
1771 ++pim6stat.pim6s_rcv_badregisters;
1772 #if MRT6DEBUG
1773 log(LOG_ERR,
1774 "pim6_input: register packet size too "
1775 "small %d from %s\n",
1776 pimlen, ip6_sprintf(&ip6->ip6_src));
1777 #endif
1778 m_freem(m);
1779 return(IPPROTO_DONE);
1780 }
1781
1782 eip6 = (struct ip6_hdr *) (reghdr + 1);
1783 #if MRT6DEBUG
1784 if (mrt6debug & DEBUG_PIM)
1785 log(LOG_DEBUG,
1786 "pim6_input[register], eip6: %s -> %s, "
1787 "eip6 plen %d\n",
1788 ip6_sprintf(&eip6->ip6_src),
1789 ip6_sprintf(&eip6->ip6_dst),
1790 ntohs(eip6->ip6_plen));
1791 #endif
1792
1793 /* verify the version number of the inner packet */
1794 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1795 ++pim6stat.pim6s_rcv_badregisters;
1796 #if MRT6DEBUG
1797 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1798 "of the inner packet\n",
1799 (eip6->ip6_vfc & IPV6_VERSION));
1800 #endif
1801 m_freem(m);
1802 return(IPPROTO_NONE);
1803 }
1804
1805 /* verify the inner packet is destined to a mcast group */
1806 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1807 ++pim6stat.pim6s_rcv_badregisters;
1808 #if MRT6DEBUG
1809 if (mrt6debug & DEBUG_PIM)
1810 log(LOG_DEBUG,
1811 "pim6_input: inner packet of register "
1812 "is not multicast %s\n",
1813 ip6_sprintf(&eip6->ip6_dst));
1814 #endif
1815 m_freem(m);
1816 return(IPPROTO_DONE);
1817 }
1818
1819 /*
1820 * make a copy of the whole header to pass to the daemon later.
1821 */
1822 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1823 if (mcp == NULL) {
1824 #if MRT6DEBUG
1825 log(LOG_ERR,
1826 "pim6_input: pim register: "
1827 "could not copy register head\n");
1828 #endif
1829 m_freem(m);
1830 return(IPPROTO_DONE);
1831 }
1832
1833 /*
1834 * forward the inner ip6 packet; point m_data at the inner ip6.
1835 */
1836 m_adj(m, off + PIM_MINLEN);
1837 #if MRT6DEBUG
1838 if (mrt6debug & DEBUG_PIM) {
1839 log(LOG_DEBUG,
1840 "pim6_input: forwarding decapsulated register: "
1841 "src %s, dst %s, mif %d\n",
1842 ip6_sprintf(&eip6->ip6_src),
1843 ip6_sprintf(&eip6->ip6_dst),
1844 reg_mif_num);
1845 }
1846 #endif
1847
1848 #ifdef __APPLE__
1849
1850 if (lo_dl_tag == 0)
1851 dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dl_tag);
1852
1853 if (lo_dl_tag)
1854 dlil_output(lo_dl_tag, m, 0, (struct sockaddr *)&dst, 0);
1855 else {
1856 printf("Warning: pim6_input call to dlil_find_dltag failed!\n");
1857 m_freem(m);
1858 }
1859 #else
1860 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1861 dst.sin6_family, NULL);
1862 #endif
1863
1864 /* prepare the register head to send to the mrouting daemon */
1865 m = mcp;
1866 }
1867
1868 /*
1869 * Pass the PIM message up to the daemon; if it is a register message
1870 * pass the 'head' only up to the daemon. This includes the
1871 * encapsulator ip6 header, pim header, register header and the
1872 * encapsulated ip6 header.
1873 */
1874 pim6_input_to_daemon:
1875 rip6_input(&m, offp);
1876 return(IPPROTO_DONE);
1877 }
mirror of XNU