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MFC r1.27:
[dragonfly.git] / sys / netinet6 / ip6_mroute.c
blob4a748c6d5ea50dc5486dfca9d9ca1c5d698e1b99
1 /* $FreeBSD: src/sys/netinet6/ip6_mroute.c,v 1.2.2.9 2003/01/23 21:06:47 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/ip6_mroute.c,v 1.18 2008/06/21 12:30:19 aggelos Exp $ */
3 /* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ */
4
5 /*
6 * Copyright (C) 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */
35
36 /*
37 * IP multicast forwarding procedures
38 *
39 * Written by David Waitzman, BBN Labs, August 1988.
40 * Modified by Steve Deering, Stanford, February 1989.
41 * Modified by Mark J. Steiglitz, Stanford, May, 1991
42 * Modified by Van Jacobson, LBL, January 1993
43 * Modified by Ajit Thyagarajan, PARC, August 1993
44 * Modified by Bill Fenenr, PARC, April 1994
45 *
46 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
47 */
48
49 #include "opt_inet.h"
50 #include "opt_inet6.h"
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/callout.h>
55 #include <sys/malloc.h>
56 #include <sys/mbuf.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sockio.h>
60 #include <sys/protosw.h>
61 #include <sys/errno.h>
62 #include <sys/time.h>
63 #include <sys/kernel.h>
64 #include <sys/syslog.h>
65 #include <sys/thread2.h>
66
67 #include <net/if.h>
68 #include <net/route.h>
69 #include <net/raw_cb.h>
70
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
73
74 #include <netinet/ip6.h>
75 #include <netinet6/ip6_var.h>
76 #include <netinet6/ip6_mroute.h>
77 #include <netinet6/pim6.h>
78 #include <netinet6/pim6_var.h>
79
80 #include <net/net_osdep.h>
81
82 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry");
83
84 #define M_HASCL(m) ((m)->m_flags & M_EXT)
85
86 static int ip6_mdq (struct mbuf *, struct ifnet *, struct mf6c *);
87 static void phyint_send (struct ip6_hdr *, struct mif6 *, struct mbuf *);
88
89 static int set_pim6 (int *);
90 static int socket_send (struct socket *, struct mbuf *,
91 struct sockaddr_in6 *);
92 static int register_send (struct ip6_hdr *, struct mif6 *,
93 struct mbuf *);
94
95 /*
96 * Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,
97 * except for netstat or debugging purposes.
98 */
99 struct socket *ip6_mrouter = NULL;
100 int ip6_mrouter_ver = 0;
101 int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */
102 struct mrt6stat mrt6stat;
103
104 #define NO_RTE_FOUND 0x1
105 #define RTE_FOUND 0x2
106
107 struct mf6c *mf6ctable[MF6CTBLSIZ];
108 u_char n6expire[MF6CTBLSIZ];
109 static struct mif6 mif6table[MAXMIFS];
110 #ifdef MRT6DEBUG
111 u_int mrt6debug = 0; /* debug level */
112 #define DEBUG_MFC 0x02
113 #define DEBUG_FORWARD 0x04
114 #define DEBUG_EXPIRE 0x08
115 #define DEBUG_XMIT 0x10
116 #define DEBUG_REG 0x20
117 #define DEBUG_PIM 0x40
118 #endif
119
120 static void expire_upcalls (void *);
121 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
122 #define UPCALL_EXPIRE 6 /* number of timeouts */
123
124 #ifdef INET
125 #ifdef MROUTING
126 extern struct socket *ip_mrouter;
127 #endif
128 #endif
129
130 /*
131 * 'Interfaces' associated with decapsulator (so we can tell
132 * packets that went through it from ones that get reflected
133 * by a broken gateway). These interfaces are never linked into
134 * the system ifnet list & no routes point to them. I.e., packets
135 * can't be sent this way. They only exist as a placeholder for
136 * multicast source verification.
137 */
138 struct ifnet multicast_register_if;
139
140 #define ENCAP_HOPS 64
141
142 /*
143 * Private variables.
144 */
145 static mifi_t nummifs = 0;
146 static mifi_t reg_mif_num = (mifi_t)-1;
147
148 static struct pim6stat pim6stat;
149 static int pim6;
150
151 /*
152 * Hash function for a source, group entry
153 */
154 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
155 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
156 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
157 (g).s6_addr32[2] ^ (g).s6_addr32[3])
158
159 /*
160 * Find a route for a given origin IPv6 address and Multicast group address.
161 * Quality of service parameter to be added in the future!!!
162 */
163
164 #define MF6CFIND(o, g, rt) do { \
165 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
166 rt = NULL; \
167 mrt6stat.mrt6s_mfc_lookups++; \
168 while (_rt) { \
169 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
170 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
171 (_rt->mf6c_stall == NULL)) { \
172 rt = _rt; \
173 break; \
174 } \
175 _rt = _rt->mf6c_next; \
176 } \
177 if (rt == NULL) { \
178 mrt6stat.mrt6s_mfc_misses++; \
179 } \
180 } while (0)
181
182 /*
183 * Macros to compute elapsed time efficiently
184 * Borrowed from Van Jacobson's scheduling code
185 */
186 #define TV_DELTA(a, b, delta) do { \
187 int xxs; \
188 \
189 delta = (a).tv_usec - (b).tv_usec; \
190 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
191 switch (xxs) { \
192 case 2: \
193 delta += 1000000; \
194 /* fall through */ \
195 case 1: \
196 delta += 1000000; \
197 break; \
198 default: \
199 delta += (1000000 * xxs); \
200 } \
201 } \
202 } while (0)
203
204 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
205 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
206
207 #ifdef UPCALL_TIMING
208 #define UPCALL_MAX 50
209 u_long upcall_data[UPCALL_MAX + 1];
210 static void collate();
211 #endif /* UPCALL_TIMING */
212
213 static int get_sg_cnt (struct sioc_sg_req6 *);
214 static int get_mif6_cnt (struct sioc_mif_req6 *);
215 static int ip6_mrouter_init (struct socket *, struct mbuf *, int);
216 static int add_m6if (struct mif6ctl *);
217 static int del_m6if (mifi_t *);
218 static int add_m6fc (struct mf6cctl *);
219 static int del_m6fc (struct mf6cctl *);
220
221 static struct callout expire_upcalls_ch;
222
223 /*
224 * Handle MRT setsockopt commands to modify the multicast routing tables.
225 */
226 int
227 ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
228 {
229 int error = 0;
230 struct mbuf *m;
231
232 if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
233 return (EACCES);
234
235 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
236 return (error);
237 soopt_to_mbuf(sopt, m); /* XXX */
238
239 switch (sopt->sopt_name) {
240 case MRT6_INIT:
241 #ifdef MRT6_OINIT
242 case MRT6_OINIT:
243 #endif
244 error = ip6_mrouter_init(so, m, sopt->sopt_name);
245 break;
246 case MRT6_DONE:
247 error = ip6_mrouter_done();
248 break;
249 case MRT6_ADD_MIF:
250 error = add_m6if(mtod(m, struct mif6ctl *));
251 break;
252 case MRT6_DEL_MIF:
253 error = del_m6if(mtod(m, mifi_t *));
254 break;
255 case MRT6_ADD_MFC:
256 error = add_m6fc(mtod(m, struct mf6cctl *));
257 break;
258 case MRT6_DEL_MFC:
259 error = del_m6fc(mtod(m, struct mf6cctl *));
260 break;
261 case MRT6_PIM:
262 error = set_pim6(mtod(m, int *));
263 break;
264 default:
265 error = EOPNOTSUPP;
266 break;
267 }
268
269 m_freem(m);
270 return (error);
271 }
272
273 /*
274 * Handle MRT getsockopt commands
275 */
276 int
277 ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
278 {
279 int error = 0;
280
281 if (so != ip6_mrouter) return EACCES;
282
283 switch (sopt->sopt_name) {
284 case MRT6_PIM:
285 soopt_from_kbuf(sopt, &pim6, sizeof(pim6));
286 break;
287 }
288 return (error);
289 }
290
291 /*
292 * Handle ioctl commands to obtain information from the cache
293 */
294 int
295 mrt6_ioctl(int cmd, caddr_t data)
296 {
297 int error = 0;
298
299 switch (cmd) {
300 case SIOCGETSGCNT_IN6:
301 return (get_sg_cnt((struct sioc_sg_req6 *)data));
302 break; /* for safety */
303 case SIOCGETMIFCNT_IN6:
304 return (get_mif6_cnt((struct sioc_mif_req6 *)data));
305 break; /* for safety */
306 default:
307 return (EINVAL);
308 break;
309 }
310 return error;
311 }
312
313 /*
314 * returns the packet, byte, rpf-failure count for the source group provided
315 */
316 static int
317 get_sg_cnt(struct sioc_sg_req6 *req)
318 {
319 struct mf6c *rt;
320
321 crit_enter();
322 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
323 crit_exit();
324 if (rt != NULL) {
325 req->pktcnt = rt->mf6c_pkt_cnt;
326 req->bytecnt = rt->mf6c_byte_cnt;
327 req->wrong_if = rt->mf6c_wrong_if;
328 } else
329 return (ESRCH);
330 #if 0
331 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
332 #endif
333
334 return 0;
335 }
336
337 /*
338 * returns the input and output packet and byte counts on the mif provided
339 */
340 static int
341 get_mif6_cnt(struct sioc_mif_req6 *req)
342 {
343 mifi_t mifi = req->mifi;
344
345 if (mifi >= nummifs)
346 return EINVAL;
347
348 req->icount = mif6table[mifi].m6_pkt_in;
349 req->ocount = mif6table[mifi].m6_pkt_out;
350 req->ibytes = mif6table[mifi].m6_bytes_in;
351 req->obytes = mif6table[mifi].m6_bytes_out;
352
353 return 0;
354 }
355
356 static int
357 set_pim6(int *i)
358 {
359 if ((*i != 1) && (*i != 0))
360 return EINVAL;
361
362 pim6 = *i;
363
364 return 0;
365 }
366
367 /*
368 * Enable multicast routing
369 */
370 static int
371 ip6_mrouter_init(struct socket *so, struct mbuf *m, int cmd)
372 {
373 int *v;
374
375 #ifdef MRT6DEBUG
376 if (mrt6debug)
377 log(LOG_DEBUG,
378 "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
379 so->so_type, so->so_proto->pr_protocol);
380 #endif
381
382 if (so->so_type != SOCK_RAW ||
383 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
384 return EOPNOTSUPP;
385
386 if (!m || (m->m_len != sizeof(int *)))
387 return ENOPROTOOPT;
388
389 v = mtod(m, int *);
390 if (*v != 1)
391 return ENOPROTOOPT;
392
393 if (ip6_mrouter != NULL) return EADDRINUSE;
394
395 ip6_mrouter = so;
396 ip6_mrouter_ver = cmd;
397
398 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
399 bzero((caddr_t)n6expire, sizeof(n6expire));
400
401 pim6 = 0;/* used for stubbing out/in pim stuff */
402
403 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
404 expire_upcalls, NULL);
405
406 #ifdef MRT6DEBUG
407 if (mrt6debug)
408 log(LOG_DEBUG, "ip6_mrouter_init\n");
409 #endif
410
411 return 0;
412 }
413
414 /*
415 * Disable multicast routing
416 */
417 int
418 ip6_mrouter_done(void)
419 {
420 mifi_t mifi;
421 int i;
422 struct ifnet *ifp;
423 struct in6_ifreq ifr;
424 struct mf6c *rt;
425 struct rtdetq *rte;
426
427 /*
428 * For each phyint in use, disable promiscuous reception of all IPv6
429 * multicasts.
430 */
431 #ifdef INET
432 #ifdef MROUTING
433 /*
434 * If there is still IPv4 multicast routing daemon,
435 * we remain interfaces to receive all muliticasted packets.
436 * XXX: there may be an interface in which the IPv4 multicast
437 * daemon is not interested...
438 */
439 if (!ip_mrouter)
440 #endif
441 #endif
442 {
443 for (mifi = 0; mifi < nummifs; mifi++) {
444 if (mif6table[mifi].m6_ifp &&
445 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
446 ifr.ifr_addr.sin6_family = AF_INET6;
447 ifr.ifr_addr.sin6_addr= kin6addr_any;
448 ifp = mif6table[mifi].m6_ifp;
449 lwkt_serialize_enter(ifp->if_serializer);
450 ifp->if_ioctl(ifp, SIOCDELMULTI,
451 (caddr_t)&ifr, NULL);
452 lwkt_serialize_exit(ifp->if_serializer);
453 }
454 }
455 }
456 #ifdef notyet
457 bzero((caddr_t)qtable, sizeof(qtable));
458 bzero((caddr_t)tbftable, sizeof(tbftable));
459 #endif
460 bzero((caddr_t)mif6table, sizeof(mif6table));
461 nummifs = 0;
462
463 pim6 = 0; /* used to stub out/in pim specific code */
464
465 callout_stop(&expire_upcalls_ch);
466
467 /*
468 * Free all multicast forwarding cache entries.
469 */
470 for (i = 0; i < MF6CTBLSIZ; i++) {
471 rt = mf6ctable[i];
472 while (rt) {
473 struct mf6c *frt;
474
475 for (rte = rt->mf6c_stall; rte != NULL; ) {
476 struct rtdetq *n = rte->next;
477
478 m_free(rte->m);
479 kfree(rte, M_MRTABLE);
480 rte = n;
481 }
482 frt = rt;
483 rt = rt->mf6c_next;
484 kfree(frt, M_MRTABLE);
485 }
486 }
487
488 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
489
490 /*
491 * Reset de-encapsulation cache
492 */
493 reg_mif_num = -1;
494
495 ip6_mrouter = NULL;
496 ip6_mrouter_ver = 0;
497
498 #ifdef MRT6DEBUG
499 if (mrt6debug)
500 log(LOG_DEBUG, "ip6_mrouter_done\n");
501 #endif
502
503 return 0;
504 }
505
506 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
507
508 /*
509 * Add a mif to the mif table
510 */
511 static int
512 add_m6if(struct mif6ctl *mifcp)
513 {
514 struct mif6 *mifp;
515 struct ifnet *ifp;
516 int error;
517 #ifdef notyet
518 struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
519 #endif
520
521 if (mifcp->mif6c_mifi >= MAXMIFS)
522 return EINVAL;
523 mifp = mif6table + mifcp->mif6c_mifi;
524 if (mifp->m6_ifp)
525 return EADDRINUSE; /* XXX: is it appropriate? */
526 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
527 return ENXIO;
528 ifp = ifindex2ifnet[mifcp->mif6c_pifi];
529
530 if (mifcp->mif6c_flags & MIFF_REGISTER) {
531 if (reg_mif_num == (mifi_t)-1) {
532 strlcpy(multicast_register_if.if_xname, "register_mif",
533 IFNAMSIZ);
534 multicast_register_if.if_flags |= IFF_LOOPBACK;
535 multicast_register_if.if_index = mifcp->mif6c_mifi;
536 reg_mif_num = mifcp->mif6c_mifi;
537 }
538
539 ifp = &multicast_register_if;
540
541 } /* if REGISTER */
542 else {
543 /* Make sure the interface supports multicast */
544 if ((ifp->if_flags & IFF_MULTICAST) == 0)
545 return EOPNOTSUPP;
546
547 crit_enter();
548 error = if_allmulti(ifp, 1);
549 crit_exit();
550 if (error)
551 return error;
552 }
553
554 crit_enter();
555 mifp->m6_flags = mifcp->mif6c_flags;
556 mifp->m6_ifp = ifp;
557 #ifdef notyet
558 /* scaling up here allows division by 1024 in critical code */
559 mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
560 #endif
561 /* initialize per mif pkt counters */
562 mifp->m6_pkt_in = 0;
563 mifp->m6_pkt_out = 0;
564 mifp->m6_bytes_in = 0;
565 mifp->m6_bytes_out = 0;
566 crit_exit();
567
568 /* Adjust nummifs up if the mifi is higher than nummifs */
569 if (nummifs <= mifcp->mif6c_mifi)
570 nummifs = mifcp->mif6c_mifi + 1;
571
572 #ifdef MRT6DEBUG
573 if (mrt6debug)
574 log(LOG_DEBUG,
575 "add_mif #%d, phyint %s\n",
576 mifcp->mif6c_mifi,
577 ifp->if_xname);
578 #endif
579
580 return 0;
581 }
582
583 /*
584 * Delete a mif from the mif table
585 */
586 static int
587 del_m6if(mifi_t *mifip)
588 {
589 struct mif6 *mifp = mif6table + *mifip;
590 mifi_t mifi;
591 struct ifnet *ifp;
592
593 if (*mifip >= nummifs)
594 return EINVAL;
595 if (mifp->m6_ifp == NULL)
596 return EINVAL;
597
598 crit_enter();
599
600 if (!(mifp->m6_flags & MIFF_REGISTER)) {
601 /*
602 * XXX: what if there is yet IPv4 multicast daemon
603 * using the interface?
604 */
605 ifp = mifp->m6_ifp;
606
607 if_allmulti(ifp, 0);
608 }
609
610 #ifdef notyet
611 bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
612 bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
613 #endif
614 bzero((caddr_t)mifp, sizeof (*mifp));
615
616 /* Adjust nummifs down */
617 for (mifi = nummifs; mifi > 0; mifi--)
618 if (mif6table[mifi - 1].m6_ifp)
619 break;
620 nummifs = mifi;
621
622 crit_exit();
623
624 #ifdef MRT6DEBUG
625 if (mrt6debug)
626 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
627 #endif
628
629 return 0;
630 }
631
632 /*
633 * Add an mfc entry
634 */
635 static int
636 add_m6fc(struct mf6cctl *mfccp)
637 {
638 struct mf6c *rt;
639 u_long hash;
640 struct rtdetq *rte;
641 u_short nstl;
642
643 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
644 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
645
646 /* If an entry already exists, just update the fields */
647 if (rt) {
648 #ifdef MRT6DEBUG
649 if (mrt6debug & DEBUG_MFC)
650 log(LOG_DEBUG,
651 "add_m6fc no upcall h %d o %s g %s p %x\n",
652 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
653 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
654 mfccp->mf6cc_parent);
655 #endif
656
657 crit_enter();
658 rt->mf6c_parent = mfccp->mf6cc_parent;
659 rt->mf6c_ifset = mfccp->mf6cc_ifset;
660 crit_exit();
661 return 0;
662 }
663
664 /*
665 * Find the entry for which the upcall was made and update
666 */
667 crit_enter();
668 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
669 mfccp->mf6cc_mcastgrp.sin6_addr);
670 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
671 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
672 &mfccp->mf6cc_origin.sin6_addr) &&
673 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
674 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
675 (rt->mf6c_stall != NULL)) {
676
677 if (nstl++)
678 log(LOG_ERR,
679 "add_m6fc: %s o %s g %s p %x dbx %p\n",
680 "multiple kernel entries",
681 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
682 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
683 mfccp->mf6cc_parent, rt->mf6c_stall);
684
685 #ifdef MRT6DEBUG
686 if (mrt6debug & DEBUG_MFC)
687 log(LOG_DEBUG,
688 "add_m6fc o %s g %s p %x dbg %x\n",
689 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
690 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
691 mfccp->mf6cc_parent, rt->mf6c_stall);
692 #endif
693
694 rt->mf6c_origin = mfccp->mf6cc_origin;
695 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
696 rt->mf6c_parent = mfccp->mf6cc_parent;
697 rt->mf6c_ifset = mfccp->mf6cc_ifset;
698 /* initialize pkt counters per src-grp */
699 rt->mf6c_pkt_cnt = 0;
700 rt->mf6c_byte_cnt = 0;
701 rt->mf6c_wrong_if = 0;
702
703 rt->mf6c_expire = 0; /* Don't clean this guy up */
704 n6expire[hash]--;
705
706 /* free packets Qed at the end of this entry */
707 for (rte = rt->mf6c_stall; rte != NULL; ) {
708 struct rtdetq *n = rte->next;
709 ip6_mdq(rte->m, rte->ifp, rt);
710 m_freem(rte->m);
711 #ifdef UPCALL_TIMING
712 collate(&(rte->t));
713 #endif /* UPCALL_TIMING */
714 kfree(rte, M_MRTABLE);
715 rte = n;
716 }
717 rt->mf6c_stall = NULL;
718 }
719 }
720
721 /*
722 * It is possible that an entry is being inserted without an upcall
723 */
724 if (nstl == 0) {
725 #ifdef MRT6DEBUG
726 if (mrt6debug & DEBUG_MFC)
727 log(LOG_DEBUG,"add_mfc no upcall h %d o %s g %s p %x\n",
728 hash,
729 ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
730 ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
731 mfccp->mf6cc_parent);
732 #endif
733
734 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
735
736 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
737 &mfccp->mf6cc_origin.sin6_addr)&&
738 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
739 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
740
741 rt->mf6c_origin = mfccp->mf6cc_origin;
742 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
743 rt->mf6c_parent = mfccp->mf6cc_parent;
744 rt->mf6c_ifset = mfccp->mf6cc_ifset;
745 /* initialize pkt counters per src-grp */
746 rt->mf6c_pkt_cnt = 0;
747 rt->mf6c_byte_cnt = 0;
748 rt->mf6c_wrong_if = 0;
749
750 if (rt->mf6c_expire)
751 n6expire[hash]--;
752 rt->mf6c_expire = 0;
753 }
754 }
755 if (rt == NULL) {
756 /* no upcall, so make a new entry */
757 rt = (struct mf6c *)kmalloc(sizeof(*rt), M_MRTABLE,
758 M_NOWAIT);
759 if (rt == NULL) {
760 crit_exit();
761 return ENOBUFS;
762 }
763
764 /* insert new entry at head of hash chain */
765 rt->mf6c_origin = mfccp->mf6cc_origin;
766 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
767 rt->mf6c_parent = mfccp->mf6cc_parent;
768 rt->mf6c_ifset = mfccp->mf6cc_ifset;
769 /* initialize pkt counters per src-grp */
770 rt->mf6c_pkt_cnt = 0;
771 rt->mf6c_byte_cnt = 0;
772 rt->mf6c_wrong_if = 0;
773 rt->mf6c_expire = 0;
774 rt->mf6c_stall = NULL;
775
776 /* link into table */
777 rt->mf6c_next = mf6ctable[hash];
778 mf6ctable[hash] = rt;
779 }
780 }
781 crit_exit();
782 return 0;
783 }
784
785 #ifdef UPCALL_TIMING
786 /*
787 * collect delay statistics on the upcalls
788 */
789 static void
790 collate(struct timeval *t)
791 {
792 u_long d;
793 struct timeval tp;
794 u_long delta;
795
796 GET_TIME(tp);
797
798 if (TV_LT(*t, tp))
799 {
800 TV_DELTA(tp, *t, delta);
801
802 d = delta >> 10;
803 if (d > UPCALL_MAX)
804 d = UPCALL_MAX;
805
806 ++upcall_data[d];
807 }
808 }
809 #endif /* UPCALL_TIMING */
810
811 /*
812 * Delete an mfc entry
813 */
814 static int
815 del_m6fc(struct mf6cctl *mfccp)
816 {
817 struct sockaddr_in6 origin;
818 struct sockaddr_in6 mcastgrp;
819 struct mf6c *rt;
820 struct mf6c **nptr;
821 u_long hash;
822
823 origin = mfccp->mf6cc_origin;
824 mcastgrp = mfccp->mf6cc_mcastgrp;
825 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
826
827 #ifdef MRT6DEBUG
828 if (mrt6debug & DEBUG_MFC)
829 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
830 ip6_sprintf(&origin.sin6_addr),
831 ip6_sprintf(&mcastgrp.sin6_addr));
832 #endif
833
834 crit_enter();
835
836 nptr = &mf6ctable[hash];
837 while ((rt = *nptr) != NULL) {
838 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
839 &rt->mf6c_origin.sin6_addr) &&
840 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
841 &rt->mf6c_mcastgrp.sin6_addr) &&
842 rt->mf6c_stall == NULL)
843 break;
844
845 nptr = &rt->mf6c_next;
846 }
847 if (rt == NULL) {
848 crit_exit();
849 return EADDRNOTAVAIL;
850 }
851
852 *nptr = rt->mf6c_next;
853 kfree(rt, M_MRTABLE);
854
855 crit_exit();
856
857 return 0;
858 }
859
860 static int
861 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
862 {
863 if (s) {
864 if (ssb_appendaddr(&s->so_rcv,
865 (struct sockaddr *)src,
866 mm, (struct mbuf *)0) != 0) {
867 sorwakeup(s);
868 return 0;
869 }
870 }
871 m_freem(mm);
872 return -1;
873 }
874
875 /*
876 * IPv6 multicast forwarding function. This function assumes that the packet
877 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
878 * pointed to by "ifp", and the packet is to be relayed to other networks
879 * that have members of the packet's destination IPv6 multicast group.
880 *
881 * The packet is returned unscathed to the caller, unless it is
882 * erroneous, in which case a non-zero return value tells the caller to
883 * discard it.
884 */
885
886 int
887 ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
888 {
889 struct mf6c *rt;
890 struct mif6 *mifp;
891 struct mbuf *mm;
892 mifi_t mifi;
893
894 #ifdef MRT6DEBUG
895 if (mrt6debug & DEBUG_FORWARD)
896 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
897 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
898 ifp->if_index);
899 #endif
900
901 /*
902 * Don't forward a packet with Hop limit of zero or one,
903 * or a packet destined to a local-only group.
904 */
905 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst) ||
906 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
907 return 0;
908 ip6->ip6_hlim--;
909
910 /*
911 * Source address check: do not forward packets with unspecified
912 * source. It was discussed in July 2000, on ipngwg mailing list.
913 * This is rather more serious than unicast cases, because some
914 * MLD packets can be sent with the unspecified source address
915 * (although such packets must normally set 1 to the hop limit field).
916 */
917 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
918 ip6stat.ip6s_cantforward++;
919 if (ip6_log_time + ip6_log_interval < time_second) {
920 ip6_log_time = time_second;
921 log(LOG_DEBUG,
922 "cannot forward "
923 "from %s to %s nxt %d received on %s\n",
924 ip6_sprintf(&ip6->ip6_src),
925 ip6_sprintf(&ip6->ip6_dst),
926 ip6->ip6_nxt,
927 if_name(m->m_pkthdr.rcvif));
928 }
929 return 0;
930 }
931
932 /*
933 * Determine forwarding mifs from the forwarding cache table
934 */
935 crit_enter();
936 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
937
938 /* Entry exists, so forward if necessary */
939 if (rt) {
940 crit_exit();
941 return (ip6_mdq(m, ifp, rt));
942 } else {
943 /*
944 * If we don't have a route for packet's origin,
945 * Make a copy of the packet &
946 * send message to routing daemon
947 */
948
949 struct mbuf *mb0;
950 struct rtdetq *rte;
951 u_long hash;
952 /* int i, npkts;*/
953 #ifdef UPCALL_TIMING
954 struct timeval tp;
955
956 GET_TIME(tp);
957 #endif /* UPCALL_TIMING */
958
959 mrt6stat.mrt6s_no_route++;
960 #ifdef MRT6DEBUG
961 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
962 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
963 ip6_sprintf(&ip6->ip6_src),
964 ip6_sprintf(&ip6->ip6_dst));
965 #endif
966
967 /*
968 * Allocate mbufs early so that we don't do extra work if we
969 * are just going to fail anyway.
970 */
971 rte = (struct rtdetq *)kmalloc(sizeof(*rte), M_MRTABLE,
972 M_NOWAIT);
973 if (rte == NULL) {
974 crit_exit();
975 return ENOBUFS;
976 }
977 mb0 = m_copy(m, 0, M_COPYALL);
978 /*
979 * Pullup packet header if needed before storing it,
980 * as other references may modify it in the meantime.
981 */
982 if (mb0 &&
983 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
984 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
985 if (mb0 == NULL) {
986 kfree(rte, M_MRTABLE);
987 crit_exit();
988 return ENOBUFS;
989 }
990
991 /* is there an upcall waiting for this packet? */
992 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
993 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
994 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
995 &rt->mf6c_origin.sin6_addr) &&
996 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
997 &rt->mf6c_mcastgrp.sin6_addr) &&
998 (rt->mf6c_stall != NULL))
999 break;
1000 }
1001
1002 if (rt == NULL) {
1003 struct mrt6msg *im;
1004 #ifdef MRT6_OINIT
1005 struct omrt6msg *oim;
1006 #endif
1007
1008 /* no upcall, so make a new entry */
1009 rt = (struct mf6c *)kmalloc(sizeof(*rt), M_MRTABLE,
1010 M_NOWAIT);
1011 if (rt == NULL) {
1012 kfree(rte, M_MRTABLE);
1013 m_freem(mb0);
1014 crit_exit();
1015 return ENOBUFS;
1016 }
1017 /*
1018 * Make a copy of the header to send to the user
1019 * level process
1020 */
1021 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1022
1023 if (mm == NULL) {
1024 kfree(rte, M_MRTABLE);
1025 m_freem(mb0);
1026 kfree(rt, M_MRTABLE);
1027 crit_exit();
1028 return ENOBUFS;
1029 }
1030
1031 /*
1032 * Send message to routing daemon
1033 */
1034 sin6.sin6_addr = ip6->ip6_src;
1035
1036 im = NULL;
1037 #ifdef MRT6_OINIT
1038 oim = NULL;
1039 #endif
1040 switch (ip6_mrouter_ver) {
1041 #ifdef MRT6_OINIT
1042 case MRT6_OINIT:
1043 oim = mtod(mm, struct omrt6msg *);
1044 oim->im6_msgtype = MRT6MSG_NOCACHE;
1045 oim->im6_mbz = 0;
1046 break;
1047 #endif
1048 case MRT6_INIT:
1049 im = mtod(mm, struct mrt6msg *);
1050 im->im6_msgtype = MRT6MSG_NOCACHE;
1051 im->im6_mbz = 0;
1052 break;
1053 default:
1054 kfree(rte, M_MRTABLE);
1055 m_freem(mb0);
1056 kfree(rt, M_MRTABLE);
1057 crit_exit();
1058 return EINVAL;
1059 }
1060
1061 #ifdef MRT6DEBUG
1062 if (mrt6debug & DEBUG_FORWARD)
1063 log(LOG_DEBUG,
1064 "getting the iif info in the kernel\n");
1065 #endif
1066
1067 for (mifp = mif6table, mifi = 0;
1068 mifi < nummifs && mifp->m6_ifp != ifp;
1069 mifp++, mifi++)
1070 ;
1071
1072 switch (ip6_mrouter_ver) {
1073 #ifdef MRT6_OINIT
1074 case MRT6_OINIT:
1075 oim->im6_mif = mifi;
1076 break;
1077 #endif
1078 case MRT6_INIT:
1079 im->im6_mif = mifi;
1080 break;
1081 }
1082
1083 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1084 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1085 "socket queue full\n");
1086 mrt6stat.mrt6s_upq_sockfull++;
1087 kfree(rte, M_MRTABLE);
1088 m_freem(mb0);
1089 kfree(rt, M_MRTABLE);
1090 crit_exit();
1091 return ENOBUFS;
1092 }
1093
1094 mrt6stat.mrt6s_upcalls++;
1095
1096 /* insert new entry at head of hash chain */
1097 bzero(rt, sizeof(*rt));
1098 rt->mf6c_origin.sin6_family = AF_INET6;
1099 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1100 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1101 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1102 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1103 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1104 rt->mf6c_expire = UPCALL_EXPIRE;
1105 n6expire[hash]++;
1106 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1107
1108 /* link into table */
1109 rt->mf6c_next = mf6ctable[hash];
1110 mf6ctable[hash] = rt;
1111 /* Add this entry to the end of the queue */
1112 rt->mf6c_stall = rte;
1113 } else {
1114 /* determine if q has overflowed */
1115 struct rtdetq **p;
1116 int npkts = 0;
1117
1118 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1119 if (++npkts > MAX_UPQ6) {
1120 mrt6stat.mrt6s_upq_ovflw++;
1121 kfree(rte, M_MRTABLE);
1122 m_freem(mb0);
1123 crit_exit();
1124 return 0;
1125 }
1126
1127 /* Add this entry to the end of the queue */
1128 *p = rte;
1129 }
1130
1131 rte->next = NULL;
1132 rte->m = mb0;
1133 rte->ifp = ifp;
1134 #ifdef UPCALL_TIMING
1135 rte->t = tp;
1136 #endif /* UPCALL_TIMING */
1137
1138 crit_exit();
1139
1140 return 0;
1141 }
1142 }
1143
1144 /*
1145 * Clean up cache entries if upcalls are not serviced
1146 * Call from the Slow Timeout mechanism, every half second.
1147 */
1148 static void
1149 expire_upcalls(void *unused)
1150 {
1151 struct rtdetq *rte;
1152 struct mf6c *mfc, **nptr;
1153 int i;
1154
1155 crit_enter();
1156 for (i = 0; i < MF6CTBLSIZ; i++) {
1157 if (n6expire[i] == 0)
1158 continue;
1159 nptr = &mf6ctable[i];
1160 while ((mfc = *nptr) != NULL) {
1161 rte = mfc->mf6c_stall;
1162 /*
1163 * Skip real cache entries
1164 * Make sure it wasn't marked to not expire (shouldn't happen)
1165 * If it expires now
1166 */
1167 if (rte != NULL &&
1168 mfc->mf6c_expire != 0 &&
1169 --mfc->mf6c_expire == 0) {
1170 #ifdef MRT6DEBUG
1171 if (mrt6debug & DEBUG_EXPIRE)
1172 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1173 ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
1174 ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
1175 #endif
1176 /*
1177 * drop all the packets
1178 * free the mbuf with the pkt, if, timing info
1179 */
1180 do {
1181 struct rtdetq *n = rte->next;
1182 m_freem(rte->m);
1183 kfree(rte, M_MRTABLE);
1184 rte = n;
1185 } while (rte != NULL);
1186 mrt6stat.mrt6s_cache_cleanups++;
1187 n6expire[i]--;
1188
1189 *nptr = mfc->mf6c_next;
1190 kfree(mfc, M_MRTABLE);
1191 } else {
1192 nptr = &mfc->mf6c_next;
1193 }
1194 }
1195 }
1196 crit_exit();
1197 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1198 expire_upcalls, NULL);
1199 }
1200
1201 /*
1202 * Packet forwarding routine once entry in the cache is made
1203 */
1204 static int
1205 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1206 {
1207 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1208 mifi_t mifi, iif;
1209 struct mif6 *mifp;
1210 int plen = m->m_pkthdr.len;
1211
1212 /*
1213 * Macro to send packet on mif. Since RSVP packets don't get counted on
1214 * input, they shouldn't get counted on output, so statistics keeping is
1215 * separate.
1216 */
1217
1218 #define MC6_SEND(ip6, mifp, m) do { \
1219 if ((mifp)->m6_flags & MIFF_REGISTER) \
1220 register_send((ip6), (mifp), (m)); \
1221 else \
1222 phyint_send((ip6), (mifp), (m)); \
1223 } while (0)
1224
1225 /*
1226 * Don't forward if it didn't arrive from the parent mif
1227 * for its origin.
1228 */
1229 mifi = rt->mf6c_parent;
1230 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1231 /* came in the wrong interface */
1232 #ifdef MRT6DEBUG
1233 if (mrt6debug & DEBUG_FORWARD)
1234 log(LOG_DEBUG,
1235 "wrong if: ifid %d mifi %d mififid %x\n",
1236 ifp->if_index, mifi,
1237 mif6table[mifi].m6_ifp->if_index);
1238 #endif
1239 mrt6stat.mrt6s_wrong_if++;
1240 rt->mf6c_wrong_if++;
1241 /*
1242 * If we are doing PIM processing, and we are forwarding
1243 * packets on this interface, send a message to the
1244 * routing daemon.
1245 */
1246 /* have to make sure this is a valid mif */
1247 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1248 if (pim6 && (m->m_flags & M_LOOP) == 0) {
1249 /*
1250 * Check the M_LOOP flag to avoid an
1251 * unnecessary PIM assert.
1252 * XXX: M_LOOP is an ad-hoc hack...
1253 */
1254 static struct sockaddr_in6 sin6 =
1255 { sizeof(sin6), AF_INET6 };
1256
1257 struct mbuf *mm;
1258 struct mrt6msg *im;
1259 #ifdef MRT6_OINIT
1260 struct omrt6msg *oim;
1261 #endif
1262
1263 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1264 if (mm &&
1265 (M_HASCL(mm) ||
1266 mm->m_len < sizeof(struct ip6_hdr)))
1267 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1268 if (mm == NULL)
1269 return ENOBUFS;
1270
1271 #ifdef MRT6_OINIT
1272 oim = NULL;
1273 #endif
1274 im = NULL;
1275 switch (ip6_mrouter_ver) {
1276 #ifdef MRT6_OINIT
1277 case MRT6_OINIT:
1278 oim = mtod(mm, struct omrt6msg *);
1279 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1280 oim->im6_mbz = 0;
1281 break;
1282 #endif
1283 case MRT6_INIT:
1284 im = mtod(mm, struct mrt6msg *);
1285 im->im6_msgtype = MRT6MSG_WRONGMIF;
1286 im->im6_mbz = 0;
1287 break;
1288 default:
1289 m_freem(mm);
1290 return EINVAL;
1291 }
1292
1293 for (mifp = mif6table, iif = 0;
1294 iif < nummifs && mifp &&
1295 mifp->m6_ifp != ifp;
1296 mifp++, iif++)
1297 ;
1298
1299 switch (ip6_mrouter_ver) {
1300 #ifdef MRT6_OINIT
1301 case MRT6_OINIT:
1302 oim->im6_mif = iif;
1303 sin6.sin6_addr = oim->im6_src;
1304 break;
1305 #endif
1306 case MRT6_INIT:
1307 im->im6_mif = iif;
1308 sin6.sin6_addr = im->im6_src;
1309 break;
1310 }
1311
1312 mrt6stat.mrt6s_upcalls++;
1313
1314 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1315 #ifdef MRT6DEBUG
1316 if (mrt6debug)
1317 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1318 #endif
1319 ++mrt6stat.mrt6s_upq_sockfull;
1320 return ENOBUFS;
1321 } /* if socket Q full */
1322 } /* if PIM */
1323 return 0;
1324 } /* if wrong iif */
1325
1326 /* If I sourced this packet, it counts as output, else it was input. */
1327 if (m->m_pkthdr.rcvif == NULL) {
1328 /* XXX: is rcvif really NULL when output?? */
1329 mif6table[mifi].m6_pkt_out++;
1330 mif6table[mifi].m6_bytes_out += plen;
1331 } else {
1332 mif6table[mifi].m6_pkt_in++;
1333 mif6table[mifi].m6_bytes_in += plen;
1334 }
1335 rt->mf6c_pkt_cnt++;
1336 rt->mf6c_byte_cnt += plen;
1337
1338 /*
1339 * For each mif, forward a copy of the packet if there are group
1340 * members downstream on the interface.
1341 */
1342 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++)
1343 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1344 /*
1345 * check if the outgoing packet is going to break
1346 * a scope boundary.
1347 * XXX For packets through PIM register tunnel
1348 * interface, we believe a routing daemon.
1349 */
1350 if ((mif6table[rt->mf6c_parent].m6_flags &
1351 MIFF_REGISTER) == 0 &&
1352 (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 &&
1353 (in6_addr2scopeid(ifp, &ip6->ip6_dst) !=
1354 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1355 &ip6->ip6_dst) ||
1356 in6_addr2scopeid(ifp, &ip6->ip6_src) !=
1357 in6_addr2scopeid(mif6table[mifi].m6_ifp,
1358 &ip6->ip6_src))) {
1359 ip6stat.ip6s_badscope++;
1360 continue;
1361 }
1362
1363 mifp->m6_pkt_out++;
1364 mifp->m6_bytes_out += plen;
1365 MC6_SEND(ip6, mifp, m);
1366 }
1367 return 0;
1368 }
1369
1370 static void
1371 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1372 {
1373 struct mbuf *mb_copy;
1374 struct ifnet *ifp = mifp->m6_ifp;
1375 int error = 0;
1376 static struct route_in6 ro;
1377 struct in6_multi *in6m;
1378 struct sockaddr_in6 *dst6;
1379
1380 crit_enter(); /* needs to protect static "ro" below. */
1381
1382 /*
1383 * Make a new reference to the packet; make sure that
1384 * the IPv6 header is actually copied, not just referenced,
1385 * so that ip6_output() only scribbles on the copy.
1386 */
1387 mb_copy = m_copy(m, 0, M_COPYALL);
1388 if (mb_copy &&
1389 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1390 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1391 if (mb_copy == NULL) {
1392 crit_exit();
1393 return;
1394 }
1395 /* set MCAST flag to the outgoing packet */
1396 mb_copy->m_flags |= M_MCAST;
1397
1398 /*
1399 * If we sourced the packet, call ip6_output since we may devide
1400 * the packet into fragments when the packet is too big for the
1401 * outgoing interface.
1402 * Otherwise, we can simply send the packet to the interface
1403 * sending queue.
1404 */
1405 if (m->m_pkthdr.rcvif == NULL) {
1406 struct ip6_moptions im6o;
1407
1408 im6o.im6o_multicast_ifp = ifp;
1409 /* XXX: ip6_output will override ip6->ip6_hlim */
1410 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1411 im6o.im6o_multicast_loop = 1;
1412 error = ip6_output(mb_copy, NULL, &ro,
1413 IPV6_FORWARDING, &im6o, NULL, NULL);
1414
1415 #ifdef MRT6DEBUG
1416 if (mrt6debug & DEBUG_XMIT)
1417 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1418 mifp - mif6table, error);
1419 #endif
1420 crit_exit();
1421 return;
1422 }
1423
1424 /*
1425 * If we belong to the destination multicast group
1426 * on the outgoing interface, loop back a copy.
1427 */
1428 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
1429 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1430 if (in6m != NULL) {
1431 dst6->sin6_len = sizeof(struct sockaddr_in6);
1432 dst6->sin6_family = AF_INET6;
1433 dst6->sin6_addr = ip6->ip6_dst;
1434 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
1435 }
1436 /*
1437 * Put the packet into the sending queue of the outgoing interface
1438 * if it would fit in the MTU of the interface.
1439 */
1440 if (mb_copy->m_pkthdr.len <= ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) {
1441 dst6->sin6_len = sizeof(struct sockaddr_in6);
1442 dst6->sin6_family = AF_INET6;
1443 dst6->sin6_addr = ip6->ip6_dst;
1444 /*
1445 * We just call if_output instead of nd6_output here, since
1446 * we need no ND for a multicast forwarded packet...right?
1447 */
1448 error = ifp->if_output(ifp, mb_copy,
1449 (struct sockaddr *)&ro.ro_dst, NULL);
1450 #ifdef MRT6DEBUG
1451 if (mrt6debug & DEBUG_XMIT)
1452 log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1453 mifp - mif6table, error);
1454 #endif
1455 } else {
1456 #ifdef MULTICAST_PMTUD
1457 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
1458 #else
1459 #ifdef MRT6DEBUG
1460 if (mrt6debug & DEBUG_XMIT)
1461 log(LOG_DEBUG,
1462 "phyint_send: packet too big on %s o %s g %s"
1463 " size %d(discarded)\n",
1464 if_name(ifp),
1465 ip6_sprintf(&ip6->ip6_src),
1466 ip6_sprintf(&ip6->ip6_dst),
1467 mb_copy->m_pkthdr.len);
1468 #endif /* MRT6DEBUG */
1469 m_freem(mb_copy); /* simply discard the packet */
1470 #endif
1471 }
1472
1473 crit_exit();
1474 }
1475
1476 static int
1477 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1478 {
1479 struct mbuf *mm;
1480 int i, len = m->m_pkthdr.len;
1481 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1482 struct mrt6msg *im6;
1483
1484 #ifdef MRT6DEBUG
1485 if (mrt6debug)
1486 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1487 ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
1488 #endif
1489 ++pim6stat.pim6s_snd_registers;
1490
1491 /* Make a copy of the packet to send to the user level process */
1492 MGETHDR(mm, MB_DONTWAIT, MT_HEADER);
1493 if (mm == NULL)
1494 return ENOBUFS;
1495 mm->m_pkthdr.rcvif = NULL;
1496 mm->m_data += max_linkhdr;
1497 mm->m_len = sizeof(struct ip6_hdr);
1498
1499 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1500 m_freem(mm);
1501 return ENOBUFS;
1502 }
1503 i = MHLEN - M_LEADINGSPACE(mm);
1504 if (i > len)
1505 i = len;
1506 mm = m_pullup(mm, i);
1507 if (mm == NULL)
1508 return ENOBUFS;
1509 /* TODO: check it! */
1510 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1511
1512 /*
1513 * Send message to routing daemon
1514 */
1515 sin6.sin6_addr = ip6->ip6_src;
1516
1517 im6 = mtod(mm, struct mrt6msg *);
1518 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1519 im6->im6_mbz = 0;
1520
1521 im6->im6_mif = mif - mif6table;
1522
1523 /* iif info is not given for reg. encap.n */
1524 mrt6stat.mrt6s_upcalls++;
1525
1526 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1527 #ifdef MRT6DEBUG
1528 if (mrt6debug)
1529 log(LOG_WARNING,
1530 "register_send: ip6_mrouter socket queue full\n");
1531 #endif
1532 ++mrt6stat.mrt6s_upq_sockfull;
1533 return ENOBUFS;
1534 }
1535 return 0;
1536 }
1537
1538 /*
1539 * PIM sparse mode hook
1540 * Receives the pim control messages, and passes them up to the listening
1541 * socket, using rip6_input.
1542 * The only message processed is the REGISTER pim message; the pim header
1543 * is stripped off, and the inner packet is passed to register_mforward.
1544 */
1545 int
1546 pim6_input(struct mbuf **mp, int *offp, int proto)
1547 {
1548 struct pim *pim; /* pointer to a pim struct */
1549 struct ip6_hdr *ip6;
1550 int pimlen;
1551 struct mbuf *m = *mp;
1552 int minlen;
1553 int off = *offp;
1554
1555 ++pim6stat.pim6s_rcv_total;
1556
1557 ip6 = mtod(m, struct ip6_hdr *);
1558 pimlen = m->m_pkthdr.len - *offp;
1559
1560 /*
1561 * Validate lengths
1562 */
1563 if (pimlen < PIM_MINLEN) {
1564 ++pim6stat.pim6s_rcv_tooshort;
1565 #ifdef MRT6DEBUG
1566 if (mrt6debug & DEBUG_PIM)
1567 log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1568 #endif
1569 m_freem(m);
1570 return (IPPROTO_DONE);
1571 }
1572
1573 /*
1574 * if the packet is at least as big as a REGISTER, go ahead
1575 * and grab the PIM REGISTER header size, to avoid another
1576 * possible m_pullup() later.
1577 *
1578 * PIM_MINLEN == pimhdr + u_int32 == 8
1579 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1580 */
1581 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1582
1583 /*
1584 * Make sure that the IP6 and PIM headers in contiguous memory, and
1585 * possibly the PIM REGISTER header
1586 */
1587 #ifndef PULLDOWN_TEST
1588 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1589 /* adjust pointer */
1590 ip6 = mtod(m, struct ip6_hdr *);
1591
1592 /* adjust mbuf to point to the PIM header */
1593 pim = (struct pim *)((caddr_t)ip6 + off);
1594 #else
1595 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1596 if (pim == NULL) {
1597 pim6stat.pim6s_rcv_tooshort++;
1598 return IPPROTO_DONE;
1599 }
1600 #endif
1601
1602 #define PIM6_CHECKSUM
1603 #ifdef PIM6_CHECKSUM
1604 {
1605 int cksumlen;
1606
1607 /*
1608 * Validate checksum.
1609 * If PIM REGISTER, exclude the data packet
1610 */
1611 if (pim->pim_type == PIM_REGISTER)
1612 cksumlen = PIM_MINLEN;
1613 else
1614 cksumlen = pimlen;
1615
1616 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1617 ++pim6stat.pim6s_rcv_badsum;
1618 #ifdef MRT6DEBUG
1619 if (mrt6debug & DEBUG_PIM)
1620 log(LOG_DEBUG,
1621 "pim6_input: invalid checksum\n");
1622 #endif
1623 m_freem(m);
1624 return (IPPROTO_DONE);
1625 }
1626 }
1627 #endif /* PIM_CHECKSUM */
1628
1629 /* PIM version check */
1630 if (pim->pim_ver != PIM_VERSION) {
1631 ++pim6stat.pim6s_rcv_badversion;
1632 #ifdef MRT6DEBUG
1633 log(LOG_ERR,
1634 "pim6_input: incorrect version %d, expecting %d\n",
1635 pim->pim_ver, PIM_VERSION);
1636 #endif
1637 m_freem(m);
1638 return (IPPROTO_DONE);
1639 }
1640
1641 if (pim->pim_type == PIM_REGISTER) {
1642 /*
1643 * since this is a REGISTER, we'll make a copy of the register
1644 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1645 * routing daemon.
1646 */
1647 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1648
1649 struct mbuf *mcp;
1650 struct ip6_hdr *eip6;
1651 u_int32_t *reghdr;
1652 int rc;
1653
1654 ++pim6stat.pim6s_rcv_registers;
1655
1656 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1657 #ifdef MRT6DEBUG
1658 if (mrt6debug & DEBUG_PIM)
1659 log(LOG_DEBUG,
1660 "pim6_input: register mif not set: %d\n",
1661 reg_mif_num);
1662 #endif
1663 m_freem(m);
1664 return (IPPROTO_DONE);
1665 }
1666
1667 reghdr = (u_int32_t *)(pim + 1);
1668
1669 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1670 goto pim6_input_to_daemon;
1671
1672 /*
1673 * Validate length
1674 */
1675 if (pimlen < PIM6_REG_MINLEN) {
1676 ++pim6stat.pim6s_rcv_tooshort;
1677 ++pim6stat.pim6s_rcv_badregisters;
1678 #ifdef MRT6DEBUG
1679 log(LOG_ERR,
1680 "pim6_input: register packet size too "
1681 "small %d from %s\n",
1682 pimlen, ip6_sprintf(&ip6->ip6_src));
1683 #endif
1684 m_freem(m);
1685 return (IPPROTO_DONE);
1686 }
1687
1688 eip6 = (struct ip6_hdr *) (reghdr + 1);
1689 #ifdef MRT6DEBUG
1690 if (mrt6debug & DEBUG_PIM)
1691 log(LOG_DEBUG,
1692 "pim6_input[register], eip6: %s -> %s, "
1693 "eip6 plen %d\n",
1694 ip6_sprintf(&eip6->ip6_src),
1695 ip6_sprintf(&eip6->ip6_dst),
1696 ntohs(eip6->ip6_plen));
1697 #endif
1698
1699 /* verify the version number of the inner packet */
1700 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1701 ++pim6stat.pim6s_rcv_badregisters;
1702 #ifdef MRT6DEBUG
1703 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1704 "of the inner packet\n",
1705 (eip6->ip6_vfc & IPV6_VERSION));
1706 #endif
1707 m_freem(m);
1708 return (IPPROTO_NONE);
1709 }
1710
1711 /* verify the inner packet is destined to a mcast group */
1712 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1713 ++pim6stat.pim6s_rcv_badregisters;
1714 #ifdef MRT6DEBUG
1715 if (mrt6debug & DEBUG_PIM)
1716 log(LOG_DEBUG,
1717 "pim6_input: inner packet of register "
1718 "is not multicast %s\n",
1719 ip6_sprintf(&eip6->ip6_dst));
1720 #endif
1721 m_freem(m);
1722 return (IPPROTO_DONE);
1723 }
1724
1725 /*
1726 * make a copy of the whole header to pass to the daemon later.
1727 */
1728 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1729 if (mcp == NULL) {
1730 #ifdef MRT6DEBUG
1731 log(LOG_ERR,
1732 "pim6_input: pim register: "
1733 "could not copy register head\n");
1734 #endif
1735 m_freem(m);
1736 return (IPPROTO_DONE);
1737 }
1738
1739 /*
1740 * forward the inner ip6 packet; point m_data at the inner ip6.
1741 */
1742 m_adj(m, off + PIM_MINLEN);
1743 #ifdef MRT6DEBUG
1744 if (mrt6debug & DEBUG_PIM) {
1745 log(LOG_DEBUG,
1746 "pim6_input: forwarding decapsulated register: "
1747 "src %s, dst %s, mif %d\n",
1748 ip6_sprintf(&eip6->ip6_src),
1749 ip6_sprintf(&eip6->ip6_dst),
1750 reg_mif_num);
1751 }
1752 #endif
1753
1754 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1755 dst.sin6_family, 0);
1756
1757 /* prepare the register head to send to the mrouting daemon */
1758 m = mcp;
1759 }
1760
1761 /*
1762 * Pass the PIM message up to the daemon; if it is a register message
1763 * pass the 'head' only up to the daemon. This includes the
1764 * encapsulator ip6 header, pim header, register header and the
1765 * encapsulated ip6 header.
1766 */
1767 pim6_input_to_daemon:
1768 rip6_input(&m, offp, proto);
1769 return (IPPROTO_DONE);
1770 }
DragonFly BSD