FreeBSD/Linux Kernel Cross Reference
sys/netinet6/mld6.c
1 /*-
2 * Copyright (c) 2009 Bruce Simpson.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote
13 * products derived from this software without specific prior written
14 * permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $
29 */
30
31 /*-
32 * Copyright (c) 1988 Stephen Deering.
33 * Copyright (c) 1992, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * This code is derived from software contributed to Berkeley by
37 * Stephen Deering of Stanford University.
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 * 1. Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 * 4. Neither the name of the University nor the names of its contributors
48 * may be used to endorse or promote products derived from this software
49 * without specific prior written permission.
50 *
51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * SUCH DAMAGE.
62 *
63 * @(#)igmp.c 8.1 (Berkeley) 7/19/93
64 */
65
66 #include <sys/cdefs.h>
67 __FBSDID("$FreeBSD: releng/10.0/sys/netinet6/mld6.c 254804 2013-08-24 19:51:18Z andre $");
68
69 #include "opt_inet.h"
70 #include "opt_inet6.h"
71
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/mbuf.h>
75 #include <sys/socket.h>
76 #include <sys/protosw.h>
77 #include <sys/sysctl.h>
78 #include <sys/kernel.h>
79 #include <sys/callout.h>
80 #include <sys/malloc.h>
81 #include <sys/module.h>
82 #include <sys/ktr.h>
83
84 #include <net/if.h>
85 #include <net/route.h>
86 #include <net/vnet.h>
87
88 #include <netinet/in.h>
89 #include <netinet/in_var.h>
90 #include <netinet6/in6_var.h>
91 #include <netinet/ip6.h>
92 #include <netinet6/ip6_var.h>
93 #include <netinet6/scope6_var.h>
94 #include <netinet/icmp6.h>
95 #include <netinet6/mld6.h>
96 #include <netinet6/mld6_var.h>
97
98 #include <security/mac/mac_framework.h>
99
100 #ifndef KTR_MLD
101 #define KTR_MLD KTR_INET6
102 #endif
103
104 static struct mld_ifinfo *
105 mli_alloc_locked(struct ifnet *);
106 static void mli_delete_locked(const struct ifnet *);
107 static void mld_dispatch_packet(struct mbuf *);
108 static void mld_dispatch_queue(struct ifqueue *, int);
109 static void mld_final_leave(struct in6_multi *, struct mld_ifinfo *);
110 static void mld_fasttimo_vnet(void);
111 static int mld_handle_state_change(struct in6_multi *,
112 struct mld_ifinfo *);
113 static int mld_initial_join(struct in6_multi *, struct mld_ifinfo *,
114 const int);
115 #ifdef KTR
116 static char * mld_rec_type_to_str(const int);
117 #endif
118 static void mld_set_version(struct mld_ifinfo *, const int);
119 static void mld_slowtimo_vnet(void);
120 static int mld_v1_input_query(struct ifnet *, const struct ip6_hdr *,
121 /*const*/ struct mld_hdr *);
122 static int mld_v1_input_report(struct ifnet *, const struct ip6_hdr *,
123 /*const*/ struct mld_hdr *);
124 static void mld_v1_process_group_timer(struct mld_ifinfo *,
125 struct in6_multi *);
126 static void mld_v1_process_querier_timers(struct mld_ifinfo *);
127 static int mld_v1_transmit_report(struct in6_multi *, const int);
128 static void mld_v1_update_group(struct in6_multi *, const int);
129 static void mld_v2_cancel_link_timers(struct mld_ifinfo *);
130 static void mld_v2_dispatch_general_query(struct mld_ifinfo *);
131 static struct mbuf *
132 mld_v2_encap_report(struct ifnet *, struct mbuf *);
133 static int mld_v2_enqueue_filter_change(struct ifqueue *,
134 struct in6_multi *);
135 static int mld_v2_enqueue_group_record(struct ifqueue *,
136 struct in6_multi *, const int, const int, const int,
137 const int);
138 static int mld_v2_input_query(struct ifnet *, const struct ip6_hdr *,
139 struct mbuf *, const int, const int);
140 static int mld_v2_merge_state_changes(struct in6_multi *,
141 struct ifqueue *);
142 static void mld_v2_process_group_timers(struct mld_ifinfo *,
143 struct ifqueue *, struct ifqueue *,
144 struct in6_multi *, const int);
145 static int mld_v2_process_group_query(struct in6_multi *,
146 struct mld_ifinfo *mli, int, struct mbuf *, const int);
147 static int sysctl_mld_gsr(SYSCTL_HANDLER_ARGS);
148 static int sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS);
149
150 /*
151 * Normative references: RFC 2710, RFC 3590, RFC 3810.
152 *
153 * Locking:
154 * * The MLD subsystem lock ends up being system-wide for the moment,
155 * but could be per-VIMAGE later on.
156 * * The permitted lock order is: IN6_MULTI_LOCK, MLD_LOCK, IF_ADDR_LOCK.
157 * Any may be taken independently; if any are held at the same
158 * time, the above lock order must be followed.
159 * * IN6_MULTI_LOCK covers in_multi.
160 * * MLD_LOCK covers per-link state and any global variables in this file.
161 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of
162 * per-link state iterators.
163 *
164 * XXX LOR PREVENTION
165 * A special case for IPv6 is the in6_setscope() routine. ip6_output()
166 * will not accept an ifp; it wants an embedded scope ID, unlike
167 * ip_output(), which happily takes the ifp given to it. The embedded
168 * scope ID is only used by MLD to select the outgoing interface.
169 *
170 * During interface attach and detach, MLD will take MLD_LOCK *after*
171 * the IF_AFDATA_LOCK.
172 * As in6_setscope() takes IF_AFDATA_LOCK then SCOPE_LOCK, we can't call
173 * it with MLD_LOCK held without triggering an LOR. A netisr with indirect
174 * dispatch could work around this, but we'd rather not do that, as it
175 * can introduce other races.
176 *
177 * As such, we exploit the fact that the scope ID is just the interface
178 * index, and embed it in the IPv6 destination address accordingly.
179 * This is potentially NOT VALID for MLDv1 reports, as they
180 * are always sent to the multicast group itself; as MLDv2
181 * reports are always sent to ff02::16, this is not an issue
182 * when MLDv2 is in use.
183 *
184 * This does not however eliminate the LOR when ip6_output() itself
185 * calls in6_setscope() internally whilst MLD_LOCK is held. This will
186 * trigger a LOR warning in WITNESS when the ifnet is detached.
187 *
188 * The right answer is probably to make IF_AFDATA_LOCK an rwlock, given
189 * how it's used across the network stack. Here we're simply exploiting
190 * the fact that MLD runs at a similar layer in the stack to scope6.c.
191 *
192 * VIMAGE:
193 * * Each in6_multi corresponds to an ifp, and each ifp corresponds
194 * to a vnet in ifp->if_vnet.
195 */
196 static struct mtx mld_mtx;
197 static MALLOC_DEFINE(M_MLD, "mld", "mld state");
198
199 #define MLD_EMBEDSCOPE(pin6, zoneid) \
200 if (IN6_IS_SCOPE_LINKLOCAL(pin6) || \
201 IN6_IS_ADDR_MC_INTFACELOCAL(pin6)) \
202 (pin6)->s6_addr16[1] = htons((zoneid) & 0xFFFF) \
203
204 /*
205 * VIMAGE-wide globals.
206 */
207 static VNET_DEFINE(struct timeval, mld_gsrdelay) = {10, 0};
208 static VNET_DEFINE(LIST_HEAD(, mld_ifinfo), mli_head);
209 static VNET_DEFINE(int, interface_timers_running6);
210 static VNET_DEFINE(int, state_change_timers_running6);
211 static VNET_DEFINE(int, current_state_timers_running6);
212
213 #define V_mld_gsrdelay VNET(mld_gsrdelay)
214 #define V_mli_head VNET(mli_head)
215 #define V_interface_timers_running6 VNET(interface_timers_running6)
216 #define V_state_change_timers_running6 VNET(state_change_timers_running6)
217 #define V_current_state_timers_running6 VNET(current_state_timers_running6)
218
219 SYSCTL_DECL(_net_inet6); /* Note: Not in any common header. */
220
221 SYSCTL_NODE(_net_inet6, OID_AUTO, mld, CTLFLAG_RW, 0,
222 "IPv6 Multicast Listener Discovery");
223
224 /*
225 * Virtualized sysctls.
226 */
227 SYSCTL_VNET_PROC(_net_inet6_mld, OID_AUTO, gsrdelay,
228 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
229 &VNET_NAME(mld_gsrdelay.tv_sec), 0, sysctl_mld_gsr, "I",
230 "Rate limit for MLDv2 Group-and-Source queries in seconds");
231
232 /*
233 * Non-virtualized sysctls.
234 */
235 static SYSCTL_NODE(_net_inet6_mld, OID_AUTO, ifinfo,
236 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_mld_ifinfo,
237 "Per-interface MLDv2 state");
238
239 static int mld_v1enable = 1;
240 SYSCTL_INT(_net_inet6_mld, OID_AUTO, v1enable, CTLFLAG_RW,
241 &mld_v1enable, 0, "Enable fallback to MLDv1");
242 TUNABLE_INT("net.inet6.mld.v1enable", &mld_v1enable);
243
244 static int mld_use_allow = 1;
245 SYSCTL_INT(_net_inet6_mld, OID_AUTO, use_allow, CTLFLAG_RW,
246 &mld_use_allow, 0, "Use ALLOW/BLOCK for RFC 4604 SSM joins/leaves");
247 TUNABLE_INT("net.inet6.mld.use_allow", &mld_use_allow);
248
249 /*
250 * Packed Router Alert option structure declaration.
251 */
252 struct mld_raopt {
253 struct ip6_hbh hbh;
254 struct ip6_opt pad;
255 struct ip6_opt_router ra;
256 } __packed;
257
258 /*
259 * Router Alert hop-by-hop option header.
260 */
261 static struct mld_raopt mld_ra = {
262 .hbh = { 0, 0 },
263 .pad = { .ip6o_type = IP6OPT_PADN, 0 },
264 .ra = {
265 .ip6or_type = IP6OPT_ROUTER_ALERT,
266 .ip6or_len = IP6OPT_RTALERT_LEN - 2,
267 .ip6or_value[0] = ((IP6OPT_RTALERT_MLD >> 8) & 0xFF),
268 .ip6or_value[1] = (IP6OPT_RTALERT_MLD & 0xFF)
269 }
270 };
271 static struct ip6_pktopts mld_po;
272
273 static __inline void
274 mld_save_context(struct mbuf *m, struct ifnet *ifp)
275 {
276
277 #ifdef VIMAGE
278 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet;
279 #endif /* VIMAGE */
280 m->m_pkthdr.flowid = ifp->if_index;
281 }
282
283 static __inline void
284 mld_scrub_context(struct mbuf *m)
285 {
286
287 m->m_pkthdr.PH_loc.ptr = NULL;
288 m->m_pkthdr.flowid = 0;
289 }
290
291 /*
292 * Restore context from a queued output chain.
293 * Return saved ifindex.
294 *
295 * VIMAGE: The assertion is there to make sure that we
296 * actually called CURVNET_SET() with what's in the mbuf chain.
297 */
298 static __inline uint32_t
299 mld_restore_context(struct mbuf *m)
300 {
301
302 #if defined(VIMAGE) && defined(INVARIANTS)
303 KASSERT(curvnet == m->m_pkthdr.PH_loc.ptr,
304 ("%s: called when curvnet was not restored", __func__));
305 #endif
306 return (m->m_pkthdr.flowid);
307 }
308
309 /*
310 * Retrieve or set threshold between group-source queries in seconds.
311 *
312 * VIMAGE: Assume curvnet set by caller.
313 * SMPng: NOTE: Serialized by MLD lock.
314 */
315 static int
316 sysctl_mld_gsr(SYSCTL_HANDLER_ARGS)
317 {
318 int error;
319 int i;
320
321 error = sysctl_wire_old_buffer(req, sizeof(int));
322 if (error)
323 return (error);
324
325 MLD_LOCK();
326
327 i = V_mld_gsrdelay.tv_sec;
328
329 error = sysctl_handle_int(oidp, &i, 0, req);
330 if (error || !req->newptr)
331 goto out_locked;
332
333 if (i < -1 || i >= 60) {
334 error = EINVAL;
335 goto out_locked;
336 }
337
338 CTR2(KTR_MLD, "change mld_gsrdelay from %d to %d",
339 V_mld_gsrdelay.tv_sec, i);
340 V_mld_gsrdelay.tv_sec = i;
341
342 out_locked:
343 MLD_UNLOCK();
344 return (error);
345 }
346
347 /*
348 * Expose struct mld_ifinfo to userland, keyed by ifindex.
349 * For use by ifmcstat(8).
350 *
351 * SMPng: NOTE: Does an unlocked ifindex space read.
352 * VIMAGE: Assume curvnet set by caller. The node handler itself
353 * is not directly virtualized.
354 */
355 static int
356 sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS)
357 {
358 int *name;
359 int error;
360 u_int namelen;
361 struct ifnet *ifp;
362 struct mld_ifinfo *mli;
363
364 name = (int *)arg1;
365 namelen = arg2;
366
367 if (req->newptr != NULL)
368 return (EPERM);
369
370 if (namelen != 1)
371 return (EINVAL);
372
373 error = sysctl_wire_old_buffer(req, sizeof(struct mld_ifinfo));
374 if (error)
375 return (error);
376
377 IN6_MULTI_LOCK();
378 MLD_LOCK();
379
380 if (name[0] <= 0 || name[0] > V_if_index) {
381 error = ENOENT;
382 goto out_locked;
383 }
384
385 error = ENOENT;
386
387 ifp = ifnet_byindex(name[0]);
388 if (ifp == NULL)
389 goto out_locked;
390
391 LIST_FOREACH(mli, &V_mli_head, mli_link) {
392 if (ifp == mli->mli_ifp) {
393 error = SYSCTL_OUT(req, mli,
394 sizeof(struct mld_ifinfo));
395 break;
396 }
397 }
398
399 out_locked:
400 MLD_UNLOCK();
401 IN6_MULTI_UNLOCK();
402 return (error);
403 }
404
405 /*
406 * Dispatch an entire queue of pending packet chains.
407 * VIMAGE: Assumes the vnet pointer has been set.
408 */
409 static void
410 mld_dispatch_queue(struct ifqueue *ifq, int limit)
411 {
412 struct mbuf *m;
413
414 for (;;) {
415 _IF_DEQUEUE(ifq, m);
416 if (m == NULL)
417 break;
418 CTR3(KTR_MLD, "%s: dispatch %p from %p", __func__, ifq, m);
419 mld_dispatch_packet(m);
420 if (--limit == 0)
421 break;
422 }
423 }
424
425 /*
426 * Filter outgoing MLD report state by group.
427 *
428 * Reports are ALWAYS suppressed for ALL-HOSTS (ff02::1)
429 * and node-local addresses. However, kernel and socket consumers
430 * always embed the KAME scope ID in the address provided, so strip it
431 * when performing comparison.
432 * Note: This is not the same as the *multicast* scope.
433 *
434 * Return zero if the given group is one for which MLD reports
435 * should be suppressed, or non-zero if reports should be issued.
436 */
437 static __inline int
438 mld_is_addr_reported(const struct in6_addr *addr)
439 {
440
441 KASSERT(IN6_IS_ADDR_MULTICAST(addr), ("%s: not multicast", __func__));
442
443 if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_NODELOCAL)
444 return (0);
445
446 if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_LINKLOCAL) {
447 struct in6_addr tmp = *addr;
448 in6_clearscope(&tmp);
449 if (IN6_ARE_ADDR_EQUAL(&tmp, &in6addr_linklocal_allnodes))
450 return (0);
451 }
452
453 return (1);
454 }
455
456 /*
457 * Attach MLD when PF_INET6 is attached to an interface.
458 *
459 * SMPng: Normally called with IF_AFDATA_LOCK held.
460 */
461 struct mld_ifinfo *
462 mld_domifattach(struct ifnet *ifp)
463 {
464 struct mld_ifinfo *mli;
465
466 CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
467 __func__, ifp, ifp->if_xname);
468
469 MLD_LOCK();
470
471 mli = mli_alloc_locked(ifp);
472 if (!(ifp->if_flags & IFF_MULTICAST))
473 mli->mli_flags |= MLIF_SILENT;
474 if (mld_use_allow)
475 mli->mli_flags |= MLIF_USEALLOW;
476
477 MLD_UNLOCK();
478
479 return (mli);
480 }
481
482 /*
483 * VIMAGE: assume curvnet set by caller.
484 */
485 static struct mld_ifinfo *
486 mli_alloc_locked(/*const*/ struct ifnet *ifp)
487 {
488 struct mld_ifinfo *mli;
489
490 MLD_LOCK_ASSERT();
491
492 mli = malloc(sizeof(struct mld_ifinfo), M_MLD, M_NOWAIT|M_ZERO);
493 if (mli == NULL)
494 goto out;
495
496 mli->mli_ifp = ifp;
497 mli->mli_version = MLD_VERSION_2;
498 mli->mli_flags = 0;
499 mli->mli_rv = MLD_RV_INIT;
500 mli->mli_qi = MLD_QI_INIT;
501 mli->mli_qri = MLD_QRI_INIT;
502 mli->mli_uri = MLD_URI_INIT;
503
504 SLIST_INIT(&mli->mli_relinmhead);
505
506 /*
507 * Responses to general queries are subject to bounds.
508 */
509 IFQ_SET_MAXLEN(&mli->mli_gq, MLD_MAX_RESPONSE_PACKETS);
510
511 LIST_INSERT_HEAD(&V_mli_head, mli, mli_link);
512
513 CTR2(KTR_MLD, "allocate mld_ifinfo for ifp %p(%s)",
514 ifp, ifp->if_xname);
515
516 out:
517 return (mli);
518 }
519
520 /*
521 * Hook for ifdetach.
522 *
523 * NOTE: Some finalization tasks need to run before the protocol domain
524 * is detached, but also before the link layer does its cleanup.
525 * Run before link-layer cleanup; cleanup groups, but do not free MLD state.
526 *
527 * SMPng: Caller must hold IN6_MULTI_LOCK().
528 * Must take IF_ADDR_LOCK() to cover if_multiaddrs iterator.
529 * XXX This routine is also bitten by unlocked ifma_protospec access.
530 */
531 void
532 mld_ifdetach(struct ifnet *ifp)
533 {
534 struct mld_ifinfo *mli;
535 struct ifmultiaddr *ifma;
536 struct in6_multi *inm, *tinm;
537
538 CTR3(KTR_MLD, "%s: called for ifp %p(%s)", __func__, ifp,
539 ifp->if_xname);
540
541 IN6_MULTI_LOCK_ASSERT();
542 MLD_LOCK();
543
544 mli = MLD_IFINFO(ifp);
545 if (mli->mli_version == MLD_VERSION_2) {
546 IF_ADDR_RLOCK(ifp);
547 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
548 if (ifma->ifma_addr->sa_family != AF_INET6 ||
549 ifma->ifma_protospec == NULL)
550 continue;
551 inm = (struct in6_multi *)ifma->ifma_protospec;
552 if (inm->in6m_state == MLD_LEAVING_MEMBER) {
553 SLIST_INSERT_HEAD(&mli->mli_relinmhead,
554 inm, in6m_nrele);
555 }
556 in6m_clear_recorded(inm);
557 }
558 IF_ADDR_RUNLOCK(ifp);
559 SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, in6m_nrele,
560 tinm) {
561 SLIST_REMOVE_HEAD(&mli->mli_relinmhead, in6m_nrele);
562 in6m_release_locked(inm);
563 }
564 }
565
566 MLD_UNLOCK();
567 }
568
569 /*
570 * Hook for domifdetach.
571 * Runs after link-layer cleanup; free MLD state.
572 *
573 * SMPng: Normally called with IF_AFDATA_LOCK held.
574 */
575 void
576 mld_domifdetach(struct ifnet *ifp)
577 {
578
579 CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
580 __func__, ifp, ifp->if_xname);
581
582 MLD_LOCK();
583 mli_delete_locked(ifp);
584 MLD_UNLOCK();
585 }
586
587 static void
588 mli_delete_locked(const struct ifnet *ifp)
589 {
590 struct mld_ifinfo *mli, *tmli;
591
592 CTR3(KTR_MLD, "%s: freeing mld_ifinfo for ifp %p(%s)",
593 __func__, ifp, ifp->if_xname);
594
595 MLD_LOCK_ASSERT();
596
597 LIST_FOREACH_SAFE(mli, &V_mli_head, mli_link, tmli) {
598 if (mli->mli_ifp == ifp) {
599 /*
600 * Free deferred General Query responses.
601 */
602 _IF_DRAIN(&mli->mli_gq);
603
604 LIST_REMOVE(mli, mli_link);
605
606 KASSERT(SLIST_EMPTY(&mli->mli_relinmhead),
607 ("%s: there are dangling in_multi references",
608 __func__));
609
610 free(mli, M_MLD);
611 return;
612 }
613 }
614 #ifdef INVARIANTS
615 panic("%s: mld_ifinfo not found for ifp %p\n", __func__, ifp);
616 #endif
617 }
618
619 /*
620 * Process a received MLDv1 general or address-specific query.
621 * Assumes that the query header has been pulled up to sizeof(mld_hdr).
622 *
623 * NOTE: Can't be fully const correct as we temporarily embed scope ID in
624 * mld_addr. This is OK as we own the mbuf chain.
625 */
626 static int
627 mld_v1_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
628 /*const*/ struct mld_hdr *mld)
629 {
630 struct ifmultiaddr *ifma;
631 struct mld_ifinfo *mli;
632 struct in6_multi *inm;
633 int is_general_query;
634 uint16_t timer;
635 #ifdef KTR
636 char ip6tbuf[INET6_ADDRSTRLEN];
637 #endif
638
639 is_general_query = 0;
640
641 if (!mld_v1enable) {
642 CTR3(KTR_MLD, "ignore v1 query %s on ifp %p(%s)",
643 ip6_sprintf(ip6tbuf, &mld->mld_addr),
644 ifp, ifp->if_xname);
645 return (0);
646 }
647
648 /*
649 * RFC3810 Section 6.2: MLD queries must originate from
650 * a router's link-local address.
651 */
652 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
653 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
654 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
655 ifp, ifp->if_xname);
656 return (0);
657 }
658
659 /*
660 * Do address field validation upfront before we accept
661 * the query.
662 */
663 if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
664 /*
665 * MLDv1 General Query.
666 * If this was not sent to the all-nodes group, ignore it.
667 */
668 struct in6_addr dst;
669
670 dst = ip6->ip6_dst;
671 in6_clearscope(&dst);
672 if (!IN6_ARE_ADDR_EQUAL(&dst, &in6addr_linklocal_allnodes))
673 return (EINVAL);
674 is_general_query = 1;
675 } else {
676 /*
677 * Embed scope ID of receiving interface in MLD query for
678 * lookup whilst we don't hold other locks.
679 */
680 in6_setscope(&mld->mld_addr, ifp, NULL);
681 }
682
683 IN6_MULTI_LOCK();
684 MLD_LOCK();
685
686 /*
687 * Switch to MLDv1 host compatibility mode.
688 */
689 mli = MLD_IFINFO(ifp);
690 KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
691 mld_set_version(mli, MLD_VERSION_1);
692
693 timer = (ntohs(mld->mld_maxdelay) * PR_FASTHZ) / MLD_TIMER_SCALE;
694 if (timer == 0)
695 timer = 1;
696
697 IF_ADDR_RLOCK(ifp);
698 if (is_general_query) {
699 /*
700 * For each reporting group joined on this
701 * interface, kick the report timer.
702 */
703 CTR2(KTR_MLD, "process v1 general query on ifp %p(%s)",
704 ifp, ifp->if_xname);
705 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
706 if (ifma->ifma_addr->sa_family != AF_INET6 ||
707 ifma->ifma_protospec == NULL)
708 continue;
709 inm = (struct in6_multi *)ifma->ifma_protospec;
710 mld_v1_update_group(inm, timer);
711 }
712 } else {
713 /*
714 * MLDv1 Group-Specific Query.
715 * If this is a group-specific MLDv1 query, we need only
716 * look up the single group to process it.
717 */
718 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
719 if (inm != NULL) {
720 CTR3(KTR_MLD, "process v1 query %s on ifp %p(%s)",
721 ip6_sprintf(ip6tbuf, &mld->mld_addr),
722 ifp, ifp->if_xname);
723 mld_v1_update_group(inm, timer);
724 }
725 /* XXX Clear embedded scope ID as userland won't expect it. */
726 in6_clearscope(&mld->mld_addr);
727 }
728
729 IF_ADDR_RUNLOCK(ifp);
730 MLD_UNLOCK();
731 IN6_MULTI_UNLOCK();
732
733 return (0);
734 }
735
736 /*
737 * Update the report timer on a group in response to an MLDv1 query.
738 *
739 * If we are becoming the reporting member for this group, start the timer.
740 * If we already are the reporting member for this group, and timer is
741 * below the threshold, reset it.
742 *
743 * We may be updating the group for the first time since we switched
744 * to MLDv2. If we are, then we must clear any recorded source lists,
745 * and transition to REPORTING state; the group timer is overloaded
746 * for group and group-source query responses.
747 *
748 * Unlike MLDv2, the delay per group should be jittered
749 * to avoid bursts of MLDv1 reports.
750 */
751 static void
752 mld_v1_update_group(struct in6_multi *inm, const int timer)
753 {
754 #ifdef KTR
755 char ip6tbuf[INET6_ADDRSTRLEN];
756 #endif
757
758 CTR4(KTR_MLD, "%s: %s/%s timer=%d", __func__,
759 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
760 inm->in6m_ifp->if_xname, timer);
761
762 IN6_MULTI_LOCK_ASSERT();
763
764 switch (inm->in6m_state) {
765 case MLD_NOT_MEMBER:
766 case MLD_SILENT_MEMBER:
767 break;
768 case MLD_REPORTING_MEMBER:
769 if (inm->in6m_timer != 0 &&
770 inm->in6m_timer <= timer) {
771 CTR1(KTR_MLD, "%s: REPORTING and timer running, "
772 "skipping.", __func__);
773 break;
774 }
775 /* FALLTHROUGH */
776 case MLD_SG_QUERY_PENDING_MEMBER:
777 case MLD_G_QUERY_PENDING_MEMBER:
778 case MLD_IDLE_MEMBER:
779 case MLD_LAZY_MEMBER:
780 case MLD_AWAKENING_MEMBER:
781 CTR1(KTR_MLD, "%s: ->REPORTING", __func__);
782 inm->in6m_state = MLD_REPORTING_MEMBER;
783 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
784 V_current_state_timers_running6 = 1;
785 break;
786 case MLD_SLEEPING_MEMBER:
787 CTR1(KTR_MLD, "%s: ->AWAKENING", __func__);
788 inm->in6m_state = MLD_AWAKENING_MEMBER;
789 break;
790 case MLD_LEAVING_MEMBER:
791 break;
792 }
793 }
794
795 /*
796 * Process a received MLDv2 general, group-specific or
797 * group-and-source-specific query.
798 *
799 * Assumes that the query header has been pulled up to sizeof(mldv2_query).
800 *
801 * Return 0 if successful, otherwise an appropriate error code is returned.
802 */
803 static int
804 mld_v2_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
805 struct mbuf *m, const int off, const int icmp6len)
806 {
807 struct mld_ifinfo *mli;
808 struct mldv2_query *mld;
809 struct in6_multi *inm;
810 uint32_t maxdelay, nsrc, qqi;
811 int is_general_query;
812 uint16_t timer;
813 uint8_t qrv;
814 #ifdef KTR
815 char ip6tbuf[INET6_ADDRSTRLEN];
816 #endif
817
818 is_general_query = 0;
819
820 /*
821 * RFC3810 Section 6.2: MLD queries must originate from
822 * a router's link-local address.
823 */
824 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
825 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
826 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
827 ifp, ifp->if_xname);
828 return (0);
829 }
830
831 CTR2(KTR_MLD, "input v2 query on ifp %p(%s)", ifp, ifp->if_xname);
832
833 mld = (struct mldv2_query *)(mtod(m, uint8_t *) + off);
834
835 maxdelay = ntohs(mld->mld_maxdelay); /* in 1/10ths of a second */
836 if (maxdelay >= 32768) {
837 maxdelay = (MLD_MRC_MANT(maxdelay) | 0x1000) <<
838 (MLD_MRC_EXP(maxdelay) + 3);
839 }
840 timer = (maxdelay * PR_FASTHZ) / MLD_TIMER_SCALE;
841 if (timer == 0)
842 timer = 1;
843
844 qrv = MLD_QRV(mld->mld_misc);
845 if (qrv < 2) {
846 CTR3(KTR_MLD, "%s: clamping qrv %d to %d", __func__,
847 qrv, MLD_RV_INIT);
848 qrv = MLD_RV_INIT;
849 }
850
851 qqi = mld->mld_qqi;
852 if (qqi >= 128) {
853 qqi = MLD_QQIC_MANT(mld->mld_qqi) <<
854 (MLD_QQIC_EXP(mld->mld_qqi) + 3);
855 }
856
857 nsrc = ntohs(mld->mld_numsrc);
858 if (nsrc > MLD_MAX_GS_SOURCES)
859 return (EMSGSIZE);
860 if (icmp6len < sizeof(struct mldv2_query) +
861 (nsrc * sizeof(struct in6_addr)))
862 return (EMSGSIZE);
863
864 /*
865 * Do further input validation upfront to avoid resetting timers
866 * should we need to discard this query.
867 */
868 if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
869 /*
870 * A general query with a source list has undefined
871 * behaviour; discard it.
872 */
873 if (nsrc > 0)
874 return (EINVAL);
875 is_general_query = 1;
876 } else {
877 /*
878 * Embed scope ID of receiving interface in MLD query for
879 * lookup whilst we don't hold other locks (due to KAME
880 * locking lameness). We own this mbuf chain just now.
881 */
882 in6_setscope(&mld->mld_addr, ifp, NULL);
883 }
884
885 IN6_MULTI_LOCK();
886 MLD_LOCK();
887
888 mli = MLD_IFINFO(ifp);
889 KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
890
891 /*
892 * Discard the v2 query if we're in Compatibility Mode.
893 * The RFC is pretty clear that hosts need to stay in MLDv1 mode
894 * until the Old Version Querier Present timer expires.
895 */
896 if (mli->mli_version != MLD_VERSION_2)
897 goto out_locked;
898
899 mld_set_version(mli, MLD_VERSION_2);
900 mli->mli_rv = qrv;
901 mli->mli_qi = qqi;
902 mli->mli_qri = maxdelay;
903
904 CTR4(KTR_MLD, "%s: qrv %d qi %d maxdelay %d", __func__, qrv, qqi,
905 maxdelay);
906
907 if (is_general_query) {
908 /*
909 * MLDv2 General Query.
910 *
911 * Schedule a current-state report on this ifp for
912 * all groups, possibly containing source lists.
913 *
914 * If there is a pending General Query response
915 * scheduled earlier than the selected delay, do
916 * not schedule any other reports.
917 * Otherwise, reset the interface timer.
918 */
919 CTR2(KTR_MLD, "process v2 general query on ifp %p(%s)",
920 ifp, ifp->if_xname);
921 if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer) {
922 mli->mli_v2_timer = MLD_RANDOM_DELAY(timer);
923 V_interface_timers_running6 = 1;
924 }
925 } else {
926 /*
927 * MLDv2 Group-specific or Group-and-source-specific Query.
928 *
929 * Group-source-specific queries are throttled on
930 * a per-group basis to defeat denial-of-service attempts.
931 * Queries for groups we are not a member of on this
932 * link are simply ignored.
933 */
934 IF_ADDR_RLOCK(ifp);
935 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
936 if (inm == NULL) {
937 IF_ADDR_RUNLOCK(ifp);
938 goto out_locked;
939 }
940 if (nsrc > 0) {
941 if (!ratecheck(&inm->in6m_lastgsrtv,
942 &V_mld_gsrdelay)) {
943 CTR1(KTR_MLD, "%s: GS query throttled.",
944 __func__);
945 IF_ADDR_RUNLOCK(ifp);
946 goto out_locked;
947 }
948 }
949 CTR2(KTR_MLD, "process v2 group query on ifp %p(%s)",
950 ifp, ifp->if_xname);
951 /*
952 * If there is a pending General Query response
953 * scheduled sooner than the selected delay, no
954 * further report need be scheduled.
955 * Otherwise, prepare to respond to the
956 * group-specific or group-and-source query.
957 */
958 if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer)
959 mld_v2_process_group_query(inm, mli, timer, m, off);
960
961 /* XXX Clear embedded scope ID as userland won't expect it. */
962 in6_clearscope(&mld->mld_addr);
963 IF_ADDR_RUNLOCK(ifp);
964 }
965
966 out_locked:
967 MLD_UNLOCK();
968 IN6_MULTI_UNLOCK();
969
970 return (0);
971 }
972
973 /*
974 * Process a recieved MLDv2 group-specific or group-and-source-specific
975 * query.
976 * Return <0 if any error occured. Currently this is ignored.
977 */
978 static int
979 mld_v2_process_group_query(struct in6_multi *inm, struct mld_ifinfo *mli,
980 int timer, struct mbuf *m0, const int off)
981 {
982 struct mldv2_query *mld;
983 int retval;
984 uint16_t nsrc;
985
986 IN6_MULTI_LOCK_ASSERT();
987 MLD_LOCK_ASSERT();
988
989 retval = 0;
990 mld = (struct mldv2_query *)(mtod(m0, uint8_t *) + off);
991
992 switch (inm->in6m_state) {
993 case MLD_NOT_MEMBER:
994 case MLD_SILENT_MEMBER:
995 case MLD_SLEEPING_MEMBER:
996 case MLD_LAZY_MEMBER:
997 case MLD_AWAKENING_MEMBER:
998 case MLD_IDLE_MEMBER:
999 case MLD_LEAVING_MEMBER:
1000 return (retval);
1001 break;
1002 case MLD_REPORTING_MEMBER:
1003 case MLD_G_QUERY_PENDING_MEMBER:
1004 case MLD_SG_QUERY_PENDING_MEMBER:
1005 break;
1006 }
1007
1008 nsrc = ntohs(mld->mld_numsrc);
1009
1010 /*
1011 * Deal with group-specific queries upfront.
1012 * If any group query is already pending, purge any recorded
1013 * source-list state if it exists, and schedule a query response
1014 * for this group-specific query.
1015 */
1016 if (nsrc == 0) {
1017 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
1018 inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER) {
1019 in6m_clear_recorded(inm);
1020 timer = min(inm->in6m_timer, timer);
1021 }
1022 inm->in6m_state = MLD_G_QUERY_PENDING_MEMBER;
1023 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1024 V_current_state_timers_running6 = 1;
1025 return (retval);
1026 }
1027
1028 /*
1029 * Deal with the case where a group-and-source-specific query has
1030 * been received but a group-specific query is already pending.
1031 */
1032 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER) {
1033 timer = min(inm->in6m_timer, timer);
1034 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1035 V_current_state_timers_running6 = 1;
1036 return (retval);
1037 }
1038
1039 /*
1040 * Finally, deal with the case where a group-and-source-specific
1041 * query has been received, where a response to a previous g-s-r
1042 * query exists, or none exists.
1043 * In this case, we need to parse the source-list which the Querier
1044 * has provided us with and check if we have any source list filter
1045 * entries at T1 for these sources. If we do not, there is no need
1046 * schedule a report and the query may be dropped.
1047 * If we do, we must record them and schedule a current-state
1048 * report for those sources.
1049 */
1050 if (inm->in6m_nsrc > 0) {
1051 struct mbuf *m;
1052 uint8_t *sp;
1053 int i, nrecorded;
1054 int soff;
1055
1056 m = m0;
1057 soff = off + sizeof(struct mldv2_query);
1058 nrecorded = 0;
1059 for (i = 0; i < nsrc; i++) {
1060 sp = mtod(m, uint8_t *) + soff;
1061 retval = in6m_record_source(inm,
1062 (const struct in6_addr *)sp);
1063 if (retval < 0)
1064 break;
1065 nrecorded += retval;
1066 soff += sizeof(struct in6_addr);
1067 if (soff >= m->m_len) {
1068 soff = soff - m->m_len;
1069 m = m->m_next;
1070 if (m == NULL)
1071 break;
1072 }
1073 }
1074 if (nrecorded > 0) {
1075 CTR1(KTR_MLD,
1076 "%s: schedule response to SG query", __func__);
1077 inm->in6m_state = MLD_SG_QUERY_PENDING_MEMBER;
1078 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1079 V_current_state_timers_running6 = 1;
1080 }
1081 }
1082
1083 return (retval);
1084 }
1085
1086 /*
1087 * Process a received MLDv1 host membership report.
1088 * Assumes mld points to mld_hdr in pulled up mbuf chain.
1089 *
1090 * NOTE: Can't be fully const correct as we temporarily embed scope ID in
1091 * mld_addr. This is OK as we own the mbuf chain.
1092 */
1093 static int
1094 mld_v1_input_report(struct ifnet *ifp, const struct ip6_hdr *ip6,
1095 /*const*/ struct mld_hdr *mld)
1096 {
1097 struct in6_addr src, dst;
1098 struct in6_ifaddr *ia;
1099 struct in6_multi *inm;
1100 #ifdef KTR
1101 char ip6tbuf[INET6_ADDRSTRLEN];
1102 #endif
1103
1104 if (!mld_v1enable) {
1105 CTR3(KTR_MLD, "ignore v1 report %s on ifp %p(%s)",
1106 ip6_sprintf(ip6tbuf, &mld->mld_addr),
1107 ifp, ifp->if_xname);
1108 return (0);
1109 }
1110
1111 if (ifp->if_flags & IFF_LOOPBACK)
1112 return (0);
1113
1114 /*
1115 * MLDv1 reports must originate from a host's link-local address,
1116 * or the unspecified address (when booting).
1117 */
1118 src = ip6->ip6_src;
1119 in6_clearscope(&src);
1120 if (!IN6_IS_SCOPE_LINKLOCAL(&src) && !IN6_IS_ADDR_UNSPECIFIED(&src)) {
1121 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
1122 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
1123 ifp, ifp->if_xname);
1124 return (EINVAL);
1125 }
1126
1127 /*
1128 * RFC2710 Section 4: MLDv1 reports must pertain to a multicast
1129 * group, and must be directed to the group itself.
1130 */
1131 dst = ip6->ip6_dst;
1132 in6_clearscope(&dst);
1133 if (!IN6_IS_ADDR_MULTICAST(&mld->mld_addr) ||
1134 !IN6_ARE_ADDR_EQUAL(&mld->mld_addr, &dst)) {
1135 CTR3(KTR_MLD, "ignore v1 query dst %s on ifp %p(%s)",
1136 ip6_sprintf(ip6tbuf, &ip6->ip6_dst),
1137 ifp, ifp->if_xname);
1138 return (EINVAL);
1139 }
1140
1141 /*
1142 * Make sure we don't hear our own membership report, as fast
1143 * leave requires knowing that we are the only member of a
1144 * group. Assume we used the link-local address if available,
1145 * otherwise look for ::.
1146 *
1147 * XXX Note that scope ID comparison is needed for the address
1148 * returned by in6ifa_ifpforlinklocal(), but SHOULD NOT be
1149 * performed for the on-wire address.
1150 */
1151 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
1152 if ((ia && IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, IA6_IN6(ia))) ||
1153 (ia == NULL && IN6_IS_ADDR_UNSPECIFIED(&src))) {
1154 if (ia != NULL)
1155 ifa_free(&ia->ia_ifa);
1156 return (0);
1157 }
1158 if (ia != NULL)
1159 ifa_free(&ia->ia_ifa);
1160
1161 CTR3(KTR_MLD, "process v1 report %s on ifp %p(%s)",
1162 ip6_sprintf(ip6tbuf, &mld->mld_addr), ifp, ifp->if_xname);
1163
1164 /*
1165 * Embed scope ID of receiving interface in MLD query for lookup
1166 * whilst we don't hold other locks (due to KAME locking lameness).
1167 */
1168 if (!IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr))
1169 in6_setscope(&mld->mld_addr, ifp, NULL);
1170
1171 IN6_MULTI_LOCK();
1172 MLD_LOCK();
1173 IF_ADDR_RLOCK(ifp);
1174
1175 /*
1176 * MLDv1 report suppression.
1177 * If we are a member of this group, and our membership should be
1178 * reported, and our group timer is pending or about to be reset,
1179 * stop our group timer by transitioning to the 'lazy' state.
1180 */
1181 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
1182 if (inm != NULL) {
1183 struct mld_ifinfo *mli;
1184
1185 mli = inm->in6m_mli;
1186 KASSERT(mli != NULL,
1187 ("%s: no mli for ifp %p", __func__, ifp));
1188
1189 /*
1190 * If we are in MLDv2 host mode, do not allow the
1191 * other host's MLDv1 report to suppress our reports.
1192 */
1193 if (mli->mli_version == MLD_VERSION_2)
1194 goto out_locked;
1195
1196 inm->in6m_timer = 0;
1197
1198 switch (inm->in6m_state) {
1199 case MLD_NOT_MEMBER:
1200 case MLD_SILENT_MEMBER:
1201 case MLD_SLEEPING_MEMBER:
1202 break;
1203 case MLD_REPORTING_MEMBER:
1204 case MLD_IDLE_MEMBER:
1205 case MLD_AWAKENING_MEMBER:
1206 CTR3(KTR_MLD,
1207 "report suppressed for %s on ifp %p(%s)",
1208 ip6_sprintf(ip6tbuf, &mld->mld_addr),
1209 ifp, ifp->if_xname);
1210 case MLD_LAZY_MEMBER:
1211 inm->in6m_state = MLD_LAZY_MEMBER;
1212 break;
1213 case MLD_G_QUERY_PENDING_MEMBER:
1214 case MLD_SG_QUERY_PENDING_MEMBER:
1215 case MLD_LEAVING_MEMBER:
1216 break;
1217 }
1218 }
1219
1220 out_locked:
1221 IF_ADDR_RUNLOCK(ifp);
1222 MLD_UNLOCK();
1223 IN6_MULTI_UNLOCK();
1224
1225 /* XXX Clear embedded scope ID as userland won't expect it. */
1226 in6_clearscope(&mld->mld_addr);
1227
1228 return (0);
1229 }
1230
1231 /*
1232 * MLD input path.
1233 *
1234 * Assume query messages which fit in a single ICMPv6 message header
1235 * have been pulled up.
1236 * Assume that userland will want to see the message, even if it
1237 * otherwise fails kernel input validation; do not free it.
1238 * Pullup may however free the mbuf chain m if it fails.
1239 *
1240 * Return IPPROTO_DONE if we freed m. Otherwise, return 0.
1241 */
1242 int
1243 mld_input(struct mbuf *m, int off, int icmp6len)
1244 {
1245 struct ifnet *ifp;
1246 struct ip6_hdr *ip6;
1247 struct mld_hdr *mld;
1248 int mldlen;
1249
1250 CTR3(KTR_MLD, "%s: called w/mbuf (%p,%d)", __func__, m, off);
1251
1252 ifp = m->m_pkthdr.rcvif;
1253
1254 ip6 = mtod(m, struct ip6_hdr *);
1255
1256 /* Pullup to appropriate size. */
1257 mld = (struct mld_hdr *)(mtod(m, uint8_t *) + off);
1258 if (mld->mld_type == MLD_LISTENER_QUERY &&
1259 icmp6len >= sizeof(struct mldv2_query)) {
1260 mldlen = sizeof(struct mldv2_query);
1261 } else {
1262 mldlen = sizeof(struct mld_hdr);
1263 }
1264 IP6_EXTHDR_GET(mld, struct mld_hdr *, m, off, mldlen);
1265 if (mld == NULL) {
1266 ICMP6STAT_INC(icp6s_badlen);
1267 return (IPPROTO_DONE);
1268 }
1269
1270 /*
1271 * Userland needs to see all of this traffic for implementing
1272 * the endpoint discovery portion of multicast routing.
1273 */
1274 switch (mld->mld_type) {
1275 case MLD_LISTENER_QUERY:
1276 icmp6_ifstat_inc(ifp, ifs6_in_mldquery);
1277 if (icmp6len == sizeof(struct mld_hdr)) {
1278 if (mld_v1_input_query(ifp, ip6, mld) != 0)
1279 return (0);
1280 } else if (icmp6len >= sizeof(struct mldv2_query)) {
1281 if (mld_v2_input_query(ifp, ip6, m, off,
1282 icmp6len) != 0)
1283 return (0);
1284 }
1285 break;
1286 case MLD_LISTENER_REPORT:
1287 icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
1288 if (mld_v1_input_report(ifp, ip6, mld) != 0)
1289 return (0);
1290 break;
1291 case MLDV2_LISTENER_REPORT:
1292 icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
1293 break;
1294 case MLD_LISTENER_DONE:
1295 icmp6_ifstat_inc(ifp, ifs6_in_mlddone);
1296 break;
1297 default:
1298 break;
1299 }
1300
1301 return (0);
1302 }
1303
1304 /*
1305 * Fast timeout handler (global).
1306 * VIMAGE: Timeout handlers are expected to service all vimages.
1307 */
1308 void
1309 mld_fasttimo(void)
1310 {
1311 VNET_ITERATOR_DECL(vnet_iter);
1312
1313 VNET_LIST_RLOCK_NOSLEEP();
1314 VNET_FOREACH(vnet_iter) {
1315 CURVNET_SET(vnet_iter);
1316 mld_fasttimo_vnet();
1317 CURVNET_RESTORE();
1318 }
1319 VNET_LIST_RUNLOCK_NOSLEEP();
1320 }
1321
1322 /*
1323 * Fast timeout handler (per-vnet).
1324 *
1325 * VIMAGE: Assume caller has set up our curvnet.
1326 */
1327 static void
1328 mld_fasttimo_vnet(void)
1329 {
1330 struct ifqueue scq; /* State-change packets */
1331 struct ifqueue qrq; /* Query response packets */
1332 struct ifnet *ifp;
1333 struct mld_ifinfo *mli;
1334 struct ifmultiaddr *ifma;
1335 struct in6_multi *inm, *tinm;
1336 int uri_fasthz;
1337
1338 uri_fasthz = 0;
1339
1340 /*
1341 * Quick check to see if any work needs to be done, in order to
1342 * minimize the overhead of fasttimo processing.
1343 * SMPng: XXX Unlocked reads.
1344 */
1345 if (!V_current_state_timers_running6 &&
1346 !V_interface_timers_running6 &&
1347 !V_state_change_timers_running6)
1348 return;
1349
1350 IN6_MULTI_LOCK();
1351 MLD_LOCK();
1352
1353 /*
1354 * MLDv2 General Query response timer processing.
1355 */
1356 if (V_interface_timers_running6) {
1357 CTR1(KTR_MLD, "%s: interface timers running", __func__);
1358
1359 V_interface_timers_running6 = 0;
1360 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1361 if (mli->mli_v2_timer == 0) {
1362 /* Do nothing. */
1363 } else if (--mli->mli_v2_timer == 0) {
1364 mld_v2_dispatch_general_query(mli);
1365 } else {
1366 V_interface_timers_running6 = 1;
1367 }
1368 }
1369 }
1370
1371 if (!V_current_state_timers_running6 &&
1372 !V_state_change_timers_running6)
1373 goto out_locked;
1374
1375 V_current_state_timers_running6 = 0;
1376 V_state_change_timers_running6 = 0;
1377
1378 CTR1(KTR_MLD, "%s: state change timers running", __func__);
1379
1380 /*
1381 * MLD host report and state-change timer processing.
1382 * Note: Processing a v2 group timer may remove a node.
1383 */
1384 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1385 ifp = mli->mli_ifp;
1386
1387 if (mli->mli_version == MLD_VERSION_2) {
1388 uri_fasthz = MLD_RANDOM_DELAY(mli->mli_uri *
1389 PR_FASTHZ);
1390
1391 memset(&qrq, 0, sizeof(struct ifqueue));
1392 IFQ_SET_MAXLEN(&qrq, MLD_MAX_G_GS_PACKETS);
1393
1394 memset(&scq, 0, sizeof(struct ifqueue));
1395 IFQ_SET_MAXLEN(&scq, MLD_MAX_STATE_CHANGE_PACKETS);
1396 }
1397
1398 IF_ADDR_RLOCK(ifp);
1399 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1400 if (ifma->ifma_addr->sa_family != AF_INET6 ||
1401 ifma->ifma_protospec == NULL)
1402 continue;
1403 inm = (struct in6_multi *)ifma->ifma_protospec;
1404 switch (mli->mli_version) {
1405 case MLD_VERSION_1:
1406 mld_v1_process_group_timer(mli, inm);
1407 break;
1408 case MLD_VERSION_2:
1409 mld_v2_process_group_timers(mli, &qrq,
1410 &scq, inm, uri_fasthz);
1411 break;
1412 }
1413 }
1414 IF_ADDR_RUNLOCK(ifp);
1415
1416 switch (mli->mli_version) {
1417 case MLD_VERSION_1:
1418 /*
1419 * Transmit reports for this lifecycle. This
1420 * is done while not holding IF_ADDR_LOCK
1421 * since this can call
1422 * in6ifa_ifpforlinklocal() which locks
1423 * IF_ADDR_LOCK internally as well as
1424 * ip6_output() to transmit a packet.
1425 */
1426 SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead,
1427 in6m_nrele, tinm) {
1428 SLIST_REMOVE_HEAD(&mli->mli_relinmhead,
1429 in6m_nrele);
1430 (void)mld_v1_transmit_report(inm,
1431 MLD_LISTENER_REPORT);
1432 }
1433 break;
1434 case MLD_VERSION_2:
1435 mld_dispatch_queue(&qrq, 0);
1436 mld_dispatch_queue(&scq, 0);
1437
1438 /*
1439 * Free the in_multi reference(s) for
1440 * this lifecycle.
1441 */
1442 SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead,
1443 in6m_nrele, tinm) {
1444 SLIST_REMOVE_HEAD(&mli->mli_relinmhead,
1445 in6m_nrele);
1446 in6m_release_locked(inm);
1447 }
1448 break;
1449 }
1450 }
1451
1452 out_locked:
1453 MLD_UNLOCK();
1454 IN6_MULTI_UNLOCK();
1455 }
1456
1457 /*
1458 * Update host report group timer.
1459 * Will update the global pending timer flags.
1460 */
1461 static void
1462 mld_v1_process_group_timer(struct mld_ifinfo *mli, struct in6_multi *inm)
1463 {
1464 int report_timer_expired;
1465
1466 IN6_MULTI_LOCK_ASSERT();
1467 MLD_LOCK_ASSERT();
1468
1469 if (inm->in6m_timer == 0) {
1470 report_timer_expired = 0;
1471 } else if (--inm->in6m_timer == 0) {
1472 report_timer_expired = 1;
1473 } else {
1474 V_current_state_timers_running6 = 1;
1475 return;
1476 }
1477
1478 switch (inm->in6m_state) {
1479 case MLD_NOT_MEMBER:
1480 case MLD_SILENT_MEMBER:
1481 case MLD_IDLE_MEMBER:
1482 case MLD_LAZY_MEMBER:
1483 case MLD_SLEEPING_MEMBER:
1484 case MLD_AWAKENING_MEMBER:
1485 break;
1486 case MLD_REPORTING_MEMBER:
1487 if (report_timer_expired) {
1488 inm->in6m_state = MLD_IDLE_MEMBER;
1489 SLIST_INSERT_HEAD(&mli->mli_relinmhead, inm,
1490 in6m_nrele);
1491 }
1492 break;
1493 case MLD_G_QUERY_PENDING_MEMBER:
1494 case MLD_SG_QUERY_PENDING_MEMBER:
1495 case MLD_LEAVING_MEMBER:
1496 break;
1497 }
1498 }
1499
1500 /*
1501 * Update a group's timers for MLDv2.
1502 * Will update the global pending timer flags.
1503 * Note: Unlocked read from mli.
1504 */
1505 static void
1506 mld_v2_process_group_timers(struct mld_ifinfo *mli,
1507 struct ifqueue *qrq, struct ifqueue *scq,
1508 struct in6_multi *inm, const int uri_fasthz)
1509 {
1510 int query_response_timer_expired;
1511 int state_change_retransmit_timer_expired;
1512 #ifdef KTR
1513 char ip6tbuf[INET6_ADDRSTRLEN];
1514 #endif
1515
1516 IN6_MULTI_LOCK_ASSERT();
1517 MLD_LOCK_ASSERT();
1518
1519 query_response_timer_expired = 0;
1520 state_change_retransmit_timer_expired = 0;
1521
1522 /*
1523 * During a transition from compatibility mode back to MLDv2,
1524 * a group record in REPORTING state may still have its group
1525 * timer active. This is a no-op in this function; it is easier
1526 * to deal with it here than to complicate the slow-timeout path.
1527 */
1528 if (inm->in6m_timer == 0) {
1529 query_response_timer_expired = 0;
1530 } else if (--inm->in6m_timer == 0) {
1531 query_response_timer_expired = 1;
1532 } else {
1533 V_current_state_timers_running6 = 1;
1534 }
1535
1536 if (inm->in6m_sctimer == 0) {
1537 state_change_retransmit_timer_expired = 0;
1538 } else if (--inm->in6m_sctimer == 0) {
1539 state_change_retransmit_timer_expired = 1;
1540 } else {
1541 V_state_change_timers_running6 = 1;
1542 }
1543
1544 /* We are in fasttimo, so be quick about it. */
1545 if (!state_change_retransmit_timer_expired &&
1546 !query_response_timer_expired)
1547 return;
1548
1549 switch (inm->in6m_state) {
1550 case MLD_NOT_MEMBER:
1551 case MLD_SILENT_MEMBER:
1552 case MLD_SLEEPING_MEMBER:
1553 case MLD_LAZY_MEMBER:
1554 case MLD_AWAKENING_MEMBER:
1555 case MLD_IDLE_MEMBER:
1556 break;
1557 case MLD_G_QUERY_PENDING_MEMBER:
1558 case MLD_SG_QUERY_PENDING_MEMBER:
1559 /*
1560 * Respond to a previously pending Group-Specific
1561 * or Group-and-Source-Specific query by enqueueing
1562 * the appropriate Current-State report for
1563 * immediate transmission.
1564 */
1565 if (query_response_timer_expired) {
1566 int retval;
1567
1568 retval = mld_v2_enqueue_group_record(qrq, inm, 0, 1,
1569 (inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER),
1570 0);
1571 CTR2(KTR_MLD, "%s: enqueue record = %d",
1572 __func__, retval);
1573 inm->in6m_state = MLD_REPORTING_MEMBER;
1574 in6m_clear_recorded(inm);
1575 }
1576 /* FALLTHROUGH */
1577 case MLD_REPORTING_MEMBER:
1578 case MLD_LEAVING_MEMBER:
1579 if (state_change_retransmit_timer_expired) {
1580 /*
1581 * State-change retransmission timer fired.
1582 * If there are any further pending retransmissions,
1583 * set the global pending state-change flag, and
1584 * reset the timer.
1585 */
1586 if (--inm->in6m_scrv > 0) {
1587 inm->in6m_sctimer = uri_fasthz;
1588 V_state_change_timers_running6 = 1;
1589 }
1590 /*
1591 * Retransmit the previously computed state-change
1592 * report. If there are no further pending
1593 * retransmissions, the mbuf queue will be consumed.
1594 * Update T0 state to T1 as we have now sent
1595 * a state-change.
1596 */
1597 (void)mld_v2_merge_state_changes(inm, scq);
1598
1599 in6m_commit(inm);
1600 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
1601 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1602 inm->in6m_ifp->if_xname);
1603
1604 /*
1605 * If we are leaving the group for good, make sure
1606 * we release MLD's reference to it.
1607 * This release must be deferred using a SLIST,
1608 * as we are called from a loop which traverses
1609 * the in_ifmultiaddr TAILQ.
1610 */
1611 if (inm->in6m_state == MLD_LEAVING_MEMBER &&
1612 inm->in6m_scrv == 0) {
1613 inm->in6m_state = MLD_NOT_MEMBER;
1614 SLIST_INSERT_HEAD(&mli->mli_relinmhead,
1615 inm, in6m_nrele);
1616 }
1617 }
1618 break;
1619 }
1620 }
1621
1622 /*
1623 * Switch to a different version on the given interface,
1624 * as per Section 9.12.
1625 */
1626 static void
1627 mld_set_version(struct mld_ifinfo *mli, const int version)
1628 {
1629 int old_version_timer;
1630
1631 MLD_LOCK_ASSERT();
1632
1633 CTR4(KTR_MLD, "%s: switching to v%d on ifp %p(%s)", __func__,
1634 version, mli->mli_ifp, mli->mli_ifp->if_xname);
1635
1636 if (version == MLD_VERSION_1) {
1637 /*
1638 * Compute the "Older Version Querier Present" timer as per
1639 * Section 9.12.
1640 */
1641 old_version_timer = (mli->mli_rv * mli->mli_qi) + mli->mli_qri;
1642 old_version_timer *= PR_SLOWHZ;
1643 mli->mli_v1_timer = old_version_timer;
1644 }
1645
1646 if (mli->mli_v1_timer > 0 && mli->mli_version != MLD_VERSION_1) {
1647 mli->mli_version = MLD_VERSION_1;
1648 mld_v2_cancel_link_timers(mli);
1649 }
1650 }
1651
1652 /*
1653 * Cancel pending MLDv2 timers for the given link and all groups
1654 * joined on it; state-change, general-query, and group-query timers.
1655 */
1656 static void
1657 mld_v2_cancel_link_timers(struct mld_ifinfo *mli)
1658 {
1659 struct ifmultiaddr *ifma;
1660 struct ifnet *ifp;
1661 struct in6_multi *inm, *tinm;
1662
1663 CTR3(KTR_MLD, "%s: cancel v2 timers on ifp %p(%s)", __func__,
1664 mli->mli_ifp, mli->mli_ifp->if_xname);
1665
1666 IN6_MULTI_LOCK_ASSERT();
1667 MLD_LOCK_ASSERT();
1668
1669 /*
1670 * Fast-track this potentially expensive operation
1671 * by checking all the global 'timer pending' flags.
1672 */
1673 if (!V_interface_timers_running6 &&
1674 !V_state_change_timers_running6 &&
1675 !V_current_state_timers_running6)
1676 return;
1677
1678 mli->mli_v2_timer = 0;
1679
1680 ifp = mli->mli_ifp;
1681
1682 IF_ADDR_RLOCK(ifp);
1683 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1684 if (ifma->ifma_addr->sa_family != AF_INET6)
1685 continue;
1686 inm = (struct in6_multi *)ifma->ifma_protospec;
1687 switch (inm->in6m_state) {
1688 case MLD_NOT_MEMBER:
1689 case MLD_SILENT_MEMBER:
1690 case MLD_IDLE_MEMBER:
1691 case MLD_LAZY_MEMBER:
1692 case MLD_SLEEPING_MEMBER:
1693 case MLD_AWAKENING_MEMBER:
1694 break;
1695 case MLD_LEAVING_MEMBER:
1696 /*
1697 * If we are leaving the group and switching
1698 * version, we need to release the final
1699 * reference held for issuing the INCLUDE {}.
1700 */
1701 SLIST_INSERT_HEAD(&mli->mli_relinmhead, inm,
1702 in6m_nrele);
1703 /* FALLTHROUGH */
1704 case MLD_G_QUERY_PENDING_MEMBER:
1705 case MLD_SG_QUERY_PENDING_MEMBER:
1706 in6m_clear_recorded(inm);
1707 /* FALLTHROUGH */
1708 case MLD_REPORTING_MEMBER:
1709 inm->in6m_sctimer = 0;
1710 inm->in6m_timer = 0;
1711 inm->in6m_state = MLD_REPORTING_MEMBER;
1712 /*
1713 * Free any pending MLDv2 state-change records.
1714 */
1715 _IF_DRAIN(&inm->in6m_scq);
1716 break;
1717 }
1718 }
1719 IF_ADDR_RUNLOCK(ifp);
1720 SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, in6m_nrele, tinm) {
1721 SLIST_REMOVE_HEAD(&mli->mli_relinmhead, in6m_nrele);
1722 in6m_release_locked(inm);
1723 }
1724 }
1725
1726 /*
1727 * Global slowtimo handler.
1728 * VIMAGE: Timeout handlers are expected to service all vimages.
1729 */
1730 void
1731 mld_slowtimo(void)
1732 {
1733 VNET_ITERATOR_DECL(vnet_iter);
1734
1735 VNET_LIST_RLOCK_NOSLEEP();
1736 VNET_FOREACH(vnet_iter) {
1737 CURVNET_SET(vnet_iter);
1738 mld_slowtimo_vnet();
1739 CURVNET_RESTORE();
1740 }
1741 VNET_LIST_RUNLOCK_NOSLEEP();
1742 }
1743
1744 /*
1745 * Per-vnet slowtimo handler.
1746 */
1747 static void
1748 mld_slowtimo_vnet(void)
1749 {
1750 struct mld_ifinfo *mli;
1751
1752 MLD_LOCK();
1753
1754 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1755 mld_v1_process_querier_timers(mli);
1756 }
1757
1758 MLD_UNLOCK();
1759 }
1760
1761 /*
1762 * Update the Older Version Querier Present timers for a link.
1763 * See Section 9.12 of RFC 3810.
1764 */
1765 static void
1766 mld_v1_process_querier_timers(struct mld_ifinfo *mli)
1767 {
1768
1769 MLD_LOCK_ASSERT();
1770
1771 if (mli->mli_version != MLD_VERSION_2 && --mli->mli_v1_timer == 0) {
1772 /*
1773 * MLDv1 Querier Present timer expired; revert to MLDv2.
1774 */
1775 CTR5(KTR_MLD,
1776 "%s: transition from v%d -> v%d on %p(%s)",
1777 __func__, mli->mli_version, MLD_VERSION_2,
1778 mli->mli_ifp, mli->mli_ifp->if_xname);
1779 mli->mli_version = MLD_VERSION_2;
1780 }
1781 }
1782
1783 /*
1784 * Transmit an MLDv1 report immediately.
1785 */
1786 static int
1787 mld_v1_transmit_report(struct in6_multi *in6m, const int type)
1788 {
1789 struct ifnet *ifp;
1790 struct in6_ifaddr *ia;
1791 struct ip6_hdr *ip6;
1792 struct mbuf *mh, *md;
1793 struct mld_hdr *mld;
1794
1795 IN6_MULTI_LOCK_ASSERT();
1796 MLD_LOCK_ASSERT();
1797
1798 ifp = in6m->in6m_ifp;
1799 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
1800 /* ia may be NULL if link-local address is tentative. */
1801
1802 mh = m_gethdr(M_NOWAIT, MT_DATA);
1803 if (mh == NULL) {
1804 if (ia != NULL)
1805 ifa_free(&ia->ia_ifa);
1806 return (ENOMEM);
1807 }
1808 md = m_get(M_NOWAIT, MT_DATA);
1809 if (md == NULL) {
1810 m_free(mh);
1811 if (ia != NULL)
1812 ifa_free(&ia->ia_ifa);
1813 return (ENOMEM);
1814 }
1815 mh->m_next = md;
1816
1817 /*
1818 * FUTURE: Consider increasing alignment by ETHER_HDR_LEN, so
1819 * that ether_output() does not need to allocate another mbuf
1820 * for the header in the most common case.
1821 */
1822 MH_ALIGN(mh, sizeof(struct ip6_hdr));
1823 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
1824 mh->m_len = sizeof(struct ip6_hdr);
1825
1826 ip6 = mtod(mh, struct ip6_hdr *);
1827 ip6->ip6_flow = 0;
1828 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1829 ip6->ip6_vfc |= IPV6_VERSION;
1830 ip6->ip6_nxt = IPPROTO_ICMPV6;
1831 ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
1832 ip6->ip6_dst = in6m->in6m_addr;
1833
1834 md->m_len = sizeof(struct mld_hdr);
1835 mld = mtod(md, struct mld_hdr *);
1836 mld->mld_type = type;
1837 mld->mld_code = 0;
1838 mld->mld_cksum = 0;
1839 mld->mld_maxdelay = 0;
1840 mld->mld_reserved = 0;
1841 mld->mld_addr = in6m->in6m_addr;
1842 in6_clearscope(&mld->mld_addr);
1843 mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
1844 sizeof(struct ip6_hdr), sizeof(struct mld_hdr));
1845
1846 mld_save_context(mh, ifp);
1847 mh->m_flags |= M_MLDV1;
1848
1849 mld_dispatch_packet(mh);
1850
1851 if (ia != NULL)
1852 ifa_free(&ia->ia_ifa);
1853 return (0);
1854 }
1855
1856 /*
1857 * Process a state change from the upper layer for the given IPv6 group.
1858 *
1859 * Each socket holds a reference on the in_multi in its own ip_moptions.
1860 * The socket layer will have made the necessary updates to.the group
1861 * state, it is now up to MLD to issue a state change report if there
1862 * has been any change between T0 (when the last state-change was issued)
1863 * and T1 (now).
1864 *
1865 * We use the MLDv2 state machine at group level. The MLd module
1866 * however makes the decision as to which MLD protocol version to speak.
1867 * A state change *from* INCLUDE {} always means an initial join.
1868 * A state change *to* INCLUDE {} always means a final leave.
1869 *
1870 * If delay is non-zero, and the state change is an initial multicast
1871 * join, the state change report will be delayed by 'delay' ticks
1872 * in units of PR_FASTHZ if MLDv1 is active on the link; otherwise
1873 * the initial MLDv2 state change report will be delayed by whichever
1874 * is sooner, a pending state-change timer or delay itself.
1875 *
1876 * VIMAGE: curvnet should have been set by caller, as this routine
1877 * is called from the socket option handlers.
1878 */
1879 int
1880 mld_change_state(struct in6_multi *inm, const int delay)
1881 {
1882 struct mld_ifinfo *mli;
1883 struct ifnet *ifp;
1884 int error;
1885
1886 IN6_MULTI_LOCK_ASSERT();
1887
1888 error = 0;
1889
1890 /*
1891 * Try to detect if the upper layer just asked us to change state
1892 * for an interface which has now gone away.
1893 */
1894 KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
1895 ifp = inm->in6m_ifma->ifma_ifp;
1896 if (ifp != NULL) {
1897 /*
1898 * Sanity check that netinet6's notion of ifp is the
1899 * same as net's.
1900 */
1901 KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
1902 }
1903
1904 MLD_LOCK();
1905
1906 mli = MLD_IFINFO(ifp);
1907 KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
1908
1909 /*
1910 * If we detect a state transition to or from MCAST_UNDEFINED
1911 * for this group, then we are starting or finishing an MLD
1912 * life cycle for this group.
1913 */
1914 if (inm->in6m_st[1].iss_fmode != inm->in6m_st[0].iss_fmode) {
1915 CTR3(KTR_MLD, "%s: inm transition %d -> %d", __func__,
1916 inm->in6m_st[0].iss_fmode, inm->in6m_st[1].iss_fmode);
1917 if (inm->in6m_st[0].iss_fmode == MCAST_UNDEFINED) {
1918 CTR1(KTR_MLD, "%s: initial join", __func__);
1919 error = mld_initial_join(inm, mli, delay);
1920 goto out_locked;
1921 } else if (inm->in6m_st[1].iss_fmode == MCAST_UNDEFINED) {
1922 CTR1(KTR_MLD, "%s: final leave", __func__);
1923 mld_final_leave(inm, mli);
1924 goto out_locked;
1925 }
1926 } else {
1927 CTR1(KTR_MLD, "%s: filter set change", __func__);
1928 }
1929
1930 error = mld_handle_state_change(inm, mli);
1931
1932 out_locked:
1933 MLD_UNLOCK();
1934 return (error);
1935 }
1936
1937 /*
1938 * Perform the initial join for an MLD group.
1939 *
1940 * When joining a group:
1941 * If the group should have its MLD traffic suppressed, do nothing.
1942 * MLDv1 starts sending MLDv1 host membership reports.
1943 * MLDv2 will schedule an MLDv2 state-change report containing the
1944 * initial state of the membership.
1945 *
1946 * If the delay argument is non-zero, then we must delay sending the
1947 * initial state change for delay ticks (in units of PR_FASTHZ).
1948 */
1949 static int
1950 mld_initial_join(struct in6_multi *inm, struct mld_ifinfo *mli,
1951 const int delay)
1952 {
1953 struct ifnet *ifp;
1954 struct ifqueue *ifq;
1955 int error, retval, syncstates;
1956 int odelay;
1957 #ifdef KTR
1958 char ip6tbuf[INET6_ADDRSTRLEN];
1959 #endif
1960
1961 CTR4(KTR_MLD, "%s: initial join %s on ifp %p(%s)",
1962 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1963 inm->in6m_ifp, inm->in6m_ifp->if_xname);
1964
1965 error = 0;
1966 syncstates = 1;
1967
1968 ifp = inm->in6m_ifp;
1969
1970 IN6_MULTI_LOCK_ASSERT();
1971 MLD_LOCK_ASSERT();
1972
1973 KASSERT(mli && mli->mli_ifp == ifp, ("%s: inconsistent ifp", __func__));
1974
1975 /*
1976 * Groups joined on loopback or marked as 'not reported',
1977 * enter the MLD_SILENT_MEMBER state and
1978 * are never reported in any protocol exchanges.
1979 * All other groups enter the appropriate state machine
1980 * for the version in use on this link.
1981 * A link marked as MLIF_SILENT causes MLD to be completely
1982 * disabled for the link.
1983 */
1984 if ((ifp->if_flags & IFF_LOOPBACK) ||
1985 (mli->mli_flags & MLIF_SILENT) ||
1986 !mld_is_addr_reported(&inm->in6m_addr)) {
1987 CTR1(KTR_MLD,
1988 "%s: not kicking state machine for silent group", __func__);
1989 inm->in6m_state = MLD_SILENT_MEMBER;
1990 inm->in6m_timer = 0;
1991 } else {
1992 /*
1993 * Deal with overlapping in_multi lifecycle.
1994 * If this group was LEAVING, then make sure
1995 * we drop the reference we picked up to keep the
1996 * group around for the final INCLUDE {} enqueue.
1997 */
1998 if (mli->mli_version == MLD_VERSION_2 &&
1999 inm->in6m_state == MLD_LEAVING_MEMBER)
2000 in6m_release_locked(inm);
2001
2002 inm->in6m_state = MLD_REPORTING_MEMBER;
2003
2004 switch (mli->mli_version) {
2005 case MLD_VERSION_1:
2006 /*
2007 * If a delay was provided, only use it if
2008 * it is greater than the delay normally
2009 * used for an MLDv1 state change report,
2010 * and delay sending the initial MLDv1 report
2011 * by not transitioning to the IDLE state.
2012 */
2013 odelay = MLD_RANDOM_DELAY(MLD_V1_MAX_RI * PR_FASTHZ);
2014 if (delay) {
2015 inm->in6m_timer = max(delay, odelay);
2016 V_current_state_timers_running6 = 1;
2017 } else {
2018 inm->in6m_state = MLD_IDLE_MEMBER;
2019 error = mld_v1_transmit_report(inm,
2020 MLD_LISTENER_REPORT);
2021 if (error == 0) {
2022 inm->in6m_timer = odelay;
2023 V_current_state_timers_running6 = 1;
2024 }
2025 }
2026 break;
2027
2028 case MLD_VERSION_2:
2029 /*
2030 * Defer update of T0 to T1, until the first copy
2031 * of the state change has been transmitted.
2032 */
2033 syncstates = 0;
2034
2035 /*
2036 * Immediately enqueue a State-Change Report for
2037 * this interface, freeing any previous reports.
2038 * Don't kick the timers if there is nothing to do,
2039 * or if an error occurred.
2040 */
2041 ifq = &inm->in6m_scq;
2042 _IF_DRAIN(ifq);
2043 retval = mld_v2_enqueue_group_record(ifq, inm, 1,
2044 0, 0, (mli->mli_flags & MLIF_USEALLOW));
2045 CTR2(KTR_MLD, "%s: enqueue record = %d",
2046 __func__, retval);
2047 if (retval <= 0) {
2048 error = retval * -1;
2049 break;
2050 }
2051
2052 /*
2053 * Schedule transmission of pending state-change
2054 * report up to RV times for this link. The timer
2055 * will fire at the next mld_fasttimo (~200ms),
2056 * giving us an opportunity to merge the reports.
2057 *
2058 * If a delay was provided to this function, only
2059 * use this delay if sooner than the existing one.
2060 */
2061 KASSERT(mli->mli_rv > 1,
2062 ("%s: invalid robustness %d", __func__,
2063 mli->mli_rv));
2064 inm->in6m_scrv = mli->mli_rv;
2065 if (delay) {
2066 if (inm->in6m_sctimer > 1) {
2067 inm->in6m_sctimer =
2068 min(inm->in6m_sctimer, delay);
2069 } else
2070 inm->in6m_sctimer = delay;
2071 } else
2072 inm->in6m_sctimer = 1;
2073 V_state_change_timers_running6 = 1;
2074
2075 error = 0;
2076 break;
2077 }
2078 }
2079
2080 /*
2081 * Only update the T0 state if state change is atomic,
2082 * i.e. we don't need to wait for a timer to fire before we
2083 * can consider the state change to have been communicated.
2084 */
2085 if (syncstates) {
2086 in6m_commit(inm);
2087 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2088 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2089 inm->in6m_ifp->if_xname);
2090 }
2091
2092 return (error);
2093 }
2094
2095 /*
2096 * Issue an intermediate state change during the life-cycle.
2097 */
2098 static int
2099 mld_handle_state_change(struct in6_multi *inm, struct mld_ifinfo *mli)
2100 {
2101 struct ifnet *ifp;
2102 int retval;
2103 #ifdef KTR
2104 char ip6tbuf[INET6_ADDRSTRLEN];
2105 #endif
2106
2107 CTR4(KTR_MLD, "%s: state change for %s on ifp %p(%s)",
2108 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2109 inm->in6m_ifp, inm->in6m_ifp->if_xname);
2110
2111 ifp = inm->in6m_ifp;
2112
2113 IN6_MULTI_LOCK_ASSERT();
2114 MLD_LOCK_ASSERT();
2115
2116 KASSERT(mli && mli->mli_ifp == ifp,
2117 ("%s: inconsistent ifp", __func__));
2118
2119 if ((ifp->if_flags & IFF_LOOPBACK) ||
2120 (mli->mli_flags & MLIF_SILENT) ||
2121 !mld_is_addr_reported(&inm->in6m_addr) ||
2122 (mli->mli_version != MLD_VERSION_2)) {
2123 if (!mld_is_addr_reported(&inm->in6m_addr)) {
2124 CTR1(KTR_MLD,
2125 "%s: not kicking state machine for silent group", __func__);
2126 }
2127 CTR1(KTR_MLD, "%s: nothing to do", __func__);
2128 in6m_commit(inm);
2129 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2130 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2131 inm->in6m_ifp->if_xname);
2132 return (0);
2133 }
2134
2135 _IF_DRAIN(&inm->in6m_scq);
2136
2137 retval = mld_v2_enqueue_group_record(&inm->in6m_scq, inm, 1, 0, 0,
2138 (mli->mli_flags & MLIF_USEALLOW));
2139 CTR2(KTR_MLD, "%s: enqueue record = %d", __func__, retval);
2140 if (retval <= 0)
2141 return (-retval);
2142
2143 /*
2144 * If record(s) were enqueued, start the state-change
2145 * report timer for this group.
2146 */
2147 inm->in6m_scrv = mli->mli_rv;
2148 inm->in6m_sctimer = 1;
2149 V_state_change_timers_running6 = 1;
2150
2151 return (0);
2152 }
2153
2154 /*
2155 * Perform the final leave for a multicast address.
2156 *
2157 * When leaving a group:
2158 * MLDv1 sends a DONE message, if and only if we are the reporter.
2159 * MLDv2 enqueues a state-change report containing a transition
2160 * to INCLUDE {} for immediate transmission.
2161 */
2162 static void
2163 mld_final_leave(struct in6_multi *inm, struct mld_ifinfo *mli)
2164 {
2165 int syncstates;
2166 #ifdef KTR
2167 char ip6tbuf[INET6_ADDRSTRLEN];
2168 #endif
2169
2170 syncstates = 1;
2171
2172 CTR4(KTR_MLD, "%s: final leave %s on ifp %p(%s)",
2173 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2174 inm->in6m_ifp, inm->in6m_ifp->if_xname);
2175
2176 IN6_MULTI_LOCK_ASSERT();
2177 MLD_LOCK_ASSERT();
2178
2179 switch (inm->in6m_state) {
2180 case MLD_NOT_MEMBER:
2181 case MLD_SILENT_MEMBER:
2182 case MLD_LEAVING_MEMBER:
2183 /* Already leaving or left; do nothing. */
2184 CTR1(KTR_MLD,
2185 "%s: not kicking state machine for silent group", __func__);
2186 break;
2187 case MLD_REPORTING_MEMBER:
2188 case MLD_IDLE_MEMBER:
2189 case MLD_G_QUERY_PENDING_MEMBER:
2190 case MLD_SG_QUERY_PENDING_MEMBER:
2191 if (mli->mli_version == MLD_VERSION_1) {
2192 #ifdef INVARIANTS
2193 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
2194 inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER)
2195 panic("%s: MLDv2 state reached, not MLDv2 mode",
2196 __func__);
2197 #endif
2198 mld_v1_transmit_report(inm, MLD_LISTENER_DONE);
2199 inm->in6m_state = MLD_NOT_MEMBER;
2200 V_current_state_timers_running6 = 1;
2201 } else if (mli->mli_version == MLD_VERSION_2) {
2202 /*
2203 * Stop group timer and all pending reports.
2204 * Immediately enqueue a state-change report
2205 * TO_IN {} to be sent on the next fast timeout,
2206 * giving us an opportunity to merge reports.
2207 */
2208 _IF_DRAIN(&inm->in6m_scq);
2209 inm->in6m_timer = 0;
2210 inm->in6m_scrv = mli->mli_rv;
2211 CTR4(KTR_MLD, "%s: Leaving %s/%s with %d "
2212 "pending retransmissions.", __func__,
2213 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2214 inm->in6m_ifp->if_xname, inm->in6m_scrv);
2215 if (inm->in6m_scrv == 0) {
2216 inm->in6m_state = MLD_NOT_MEMBER;
2217 inm->in6m_sctimer = 0;
2218 } else {
2219 int retval;
2220
2221 in6m_acquire_locked(inm);
2222
2223 retval = mld_v2_enqueue_group_record(
2224 &inm->in6m_scq, inm, 1, 0, 0,
2225 (mli->mli_flags & MLIF_USEALLOW));
2226 KASSERT(retval != 0,
2227 ("%s: enqueue record = %d", __func__,
2228 retval));
2229
2230 inm->in6m_state = MLD_LEAVING_MEMBER;
2231 inm->in6m_sctimer = 1;
2232 V_state_change_timers_running6 = 1;
2233 syncstates = 0;
2234 }
2235 break;
2236 }
2237 break;
2238 case MLD_LAZY_MEMBER:
2239 case MLD_SLEEPING_MEMBER:
2240 case MLD_AWAKENING_MEMBER:
2241 /* Our reports are suppressed; do nothing. */
2242 break;
2243 }
2244
2245 if (syncstates) {
2246 in6m_commit(inm);
2247 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2248 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2249 inm->in6m_ifp->if_xname);
2250 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
2251 CTR3(KTR_MLD, "%s: T1 now MCAST_UNDEFINED for %p/%s",
2252 __func__, &inm->in6m_addr, inm->in6m_ifp->if_xname);
2253 }
2254 }
2255
2256 /*
2257 * Enqueue an MLDv2 group record to the given output queue.
2258 *
2259 * If is_state_change is zero, a current-state record is appended.
2260 * If is_state_change is non-zero, a state-change report is appended.
2261 *
2262 * If is_group_query is non-zero, an mbuf packet chain is allocated.
2263 * If is_group_query is zero, and if there is a packet with free space
2264 * at the tail of the queue, it will be appended to providing there
2265 * is enough free space.
2266 * Otherwise a new mbuf packet chain is allocated.
2267 *
2268 * If is_source_query is non-zero, each source is checked to see if
2269 * it was recorded for a Group-Source query, and will be omitted if
2270 * it is not both in-mode and recorded.
2271 *
2272 * If use_block_allow is non-zero, state change reports for initial join
2273 * and final leave, on an inclusive mode group with a source list, will be
2274 * rewritten to use the ALLOW_NEW and BLOCK_OLD record types, respectively.
2275 *
2276 * The function will attempt to allocate leading space in the packet
2277 * for the IPv6+ICMP headers to be prepended without fragmenting the chain.
2278 *
2279 * If successful the size of all data appended to the queue is returned,
2280 * otherwise an error code less than zero is returned, or zero if
2281 * no record(s) were appended.
2282 */
2283 static int
2284 mld_v2_enqueue_group_record(struct ifqueue *ifq, struct in6_multi *inm,
2285 const int is_state_change, const int is_group_query,
2286 const int is_source_query, const int use_block_allow)
2287 {
2288 struct mldv2_record mr;
2289 struct mldv2_record *pmr;
2290 struct ifnet *ifp;
2291 struct ip6_msource *ims, *nims;
2292 struct mbuf *m0, *m, *md;
2293 int error, is_filter_list_change;
2294 int minrec0len, m0srcs, msrcs, nbytes, off;
2295 int record_has_sources;
2296 int now;
2297 int type;
2298 uint8_t mode;
2299 #ifdef KTR
2300 char ip6tbuf[INET6_ADDRSTRLEN];
2301 #endif
2302
2303 IN6_MULTI_LOCK_ASSERT();
2304
2305 error = 0;
2306 ifp = inm->in6m_ifp;
2307 is_filter_list_change = 0;
2308 m = NULL;
2309 m0 = NULL;
2310 m0srcs = 0;
2311 msrcs = 0;
2312 nbytes = 0;
2313 nims = NULL;
2314 record_has_sources = 1;
2315 pmr = NULL;
2316 type = MLD_DO_NOTHING;
2317 mode = inm->in6m_st[1].iss_fmode;
2318
2319 /*
2320 * If we did not transition out of ASM mode during t0->t1,
2321 * and there are no source nodes to process, we can skip
2322 * the generation of source records.
2323 */
2324 if (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0 &&
2325 inm->in6m_nsrc == 0)
2326 record_has_sources = 0;
2327
2328 if (is_state_change) {
2329 /*
2330 * Queue a state change record.
2331 * If the mode did not change, and there are non-ASM
2332 * listeners or source filters present,
2333 * we potentially need to issue two records for the group.
2334 * If there are ASM listeners, and there was no filter
2335 * mode transition of any kind, do nothing.
2336 *
2337 * If we are transitioning to MCAST_UNDEFINED, we need
2338 * not send any sources. A transition to/from this state is
2339 * considered inclusive with some special treatment.
2340 *
2341 * If we are rewriting initial joins/leaves to use
2342 * ALLOW/BLOCK, and the group's membership is inclusive,
2343 * we need to send sources in all cases.
2344 */
2345 if (mode != inm->in6m_st[0].iss_fmode) {
2346 if (mode == MCAST_EXCLUDE) {
2347 CTR1(KTR_MLD, "%s: change to EXCLUDE",
2348 __func__);
2349 type = MLD_CHANGE_TO_EXCLUDE_MODE;
2350 } else {
2351 CTR1(KTR_MLD, "%s: change to INCLUDE",
2352 __func__);
2353 if (use_block_allow) {
2354 /*
2355 * XXX
2356 * Here we're interested in state
2357 * edges either direction between
2358 * MCAST_UNDEFINED and MCAST_INCLUDE.
2359 * Perhaps we should just check
2360 * the group state, rather than
2361 * the filter mode.
2362 */
2363 if (mode == MCAST_UNDEFINED) {
2364 type = MLD_BLOCK_OLD_SOURCES;
2365 } else {
2366 type = MLD_ALLOW_NEW_SOURCES;
2367 }
2368 } else {
2369 type = MLD_CHANGE_TO_INCLUDE_MODE;
2370 if (mode == MCAST_UNDEFINED)
2371 record_has_sources = 0;
2372 }
2373 }
2374 } else {
2375 if (record_has_sources) {
2376 is_filter_list_change = 1;
2377 } else {
2378 type = MLD_DO_NOTHING;
2379 }
2380 }
2381 } else {
2382 /*
2383 * Queue a current state record.
2384 */
2385 if (mode == MCAST_EXCLUDE) {
2386 type = MLD_MODE_IS_EXCLUDE;
2387 } else if (mode == MCAST_INCLUDE) {
2388 type = MLD_MODE_IS_INCLUDE;
2389 KASSERT(inm->in6m_st[1].iss_asm == 0,
2390 ("%s: inm %p is INCLUDE but ASM count is %d",
2391 __func__, inm, inm->in6m_st[1].iss_asm));
2392 }
2393 }
2394
2395 /*
2396 * Generate the filter list changes using a separate function.
2397 */
2398 if (is_filter_list_change)
2399 return (mld_v2_enqueue_filter_change(ifq, inm));
2400
2401 if (type == MLD_DO_NOTHING) {
2402 CTR3(KTR_MLD, "%s: nothing to do for %s/%s",
2403 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2404 inm->in6m_ifp->if_xname);
2405 return (0);
2406 }
2407
2408 /*
2409 * If any sources are present, we must be able to fit at least
2410 * one in the trailing space of the tail packet's mbuf,
2411 * ideally more.
2412 */
2413 minrec0len = sizeof(struct mldv2_record);
2414 if (record_has_sources)
2415 minrec0len += sizeof(struct in6_addr);
2416
2417 CTR4(KTR_MLD, "%s: queueing %s for %s/%s", __func__,
2418 mld_rec_type_to_str(type),
2419 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2420 inm->in6m_ifp->if_xname);
2421
2422 /*
2423 * Check if we have a packet in the tail of the queue for this
2424 * group into which the first group record for this group will fit.
2425 * Otherwise allocate a new packet.
2426 * Always allocate leading space for IP6+RA+ICMPV6+REPORT.
2427 * Note: Group records for G/GSR query responses MUST be sent
2428 * in their own packet.
2429 */
2430 m0 = ifq->ifq_tail;
2431 if (!is_group_query &&
2432 m0 != NULL &&
2433 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= MLD_V2_REPORT_MAXRECS) &&
2434 (m0->m_pkthdr.len + minrec0len) <
2435 (ifp->if_mtu - MLD_MTUSPACE)) {
2436 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
2437 sizeof(struct mldv2_record)) /
2438 sizeof(struct in6_addr);
2439 m = m0;
2440 CTR1(KTR_MLD, "%s: use existing packet", __func__);
2441 } else {
2442 if (_IF_QFULL(ifq)) {
2443 CTR1(KTR_MLD, "%s: outbound queue full", __func__);
2444 return (-ENOMEM);
2445 }
2446 m = NULL;
2447 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2448 sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
2449 if (!is_state_change && !is_group_query)
2450 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2451 if (m == NULL)
2452 m = m_gethdr(M_NOWAIT, MT_DATA);
2453 if (m == NULL)
2454 return (-ENOMEM);
2455
2456 mld_save_context(m, ifp);
2457
2458 CTR1(KTR_MLD, "%s: allocated first packet", __func__);
2459 }
2460
2461 /*
2462 * Append group record.
2463 * If we have sources, we don't know how many yet.
2464 */
2465 mr.mr_type = type;
2466 mr.mr_datalen = 0;
2467 mr.mr_numsrc = 0;
2468 mr.mr_addr = inm->in6m_addr;
2469 in6_clearscope(&mr.mr_addr);
2470 if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
2471 if (m != m0)
2472 m_freem(m);
2473 CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
2474 return (-ENOMEM);
2475 }
2476 nbytes += sizeof(struct mldv2_record);
2477
2478 /*
2479 * Append as many sources as will fit in the first packet.
2480 * If we are appending to a new packet, the chain allocation
2481 * may potentially use clusters; use m_getptr() in this case.
2482 * If we are appending to an existing packet, we need to obtain
2483 * a pointer to the group record after m_append(), in case a new
2484 * mbuf was allocated.
2485 *
2486 * Only append sources which are in-mode at t1. If we are
2487 * transitioning to MCAST_UNDEFINED state on the group, and
2488 * use_block_allow is zero, do not include source entries.
2489 * Otherwise, we need to include this source in the report.
2490 *
2491 * Only report recorded sources in our filter set when responding
2492 * to a group-source query.
2493 */
2494 if (record_has_sources) {
2495 if (m == m0) {
2496 md = m_last(m);
2497 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
2498 md->m_len - nbytes);
2499 } else {
2500 md = m_getptr(m, 0, &off);
2501 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
2502 off);
2503 }
2504 msrcs = 0;
2505 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs,
2506 nims) {
2507 CTR2(KTR_MLD, "%s: visit node %s", __func__,
2508 ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2509 now = im6s_get_mode(inm, ims, 1);
2510 CTR2(KTR_MLD, "%s: node is %d", __func__, now);
2511 if ((now != mode) ||
2512 (now == mode &&
2513 (!use_block_allow && mode == MCAST_UNDEFINED))) {
2514 CTR1(KTR_MLD, "%s: skip node", __func__);
2515 continue;
2516 }
2517 if (is_source_query && ims->im6s_stp == 0) {
2518 CTR1(KTR_MLD, "%s: skip unrecorded node",
2519 __func__);
2520 continue;
2521 }
2522 CTR1(KTR_MLD, "%s: append node", __func__);
2523 if (!m_append(m, sizeof(struct in6_addr),
2524 (void *)&ims->im6s_addr)) {
2525 if (m != m0)
2526 m_freem(m);
2527 CTR1(KTR_MLD, "%s: m_append() failed.",
2528 __func__);
2529 return (-ENOMEM);
2530 }
2531 nbytes += sizeof(struct in6_addr);
2532 ++msrcs;
2533 if (msrcs == m0srcs)
2534 break;
2535 }
2536 CTR2(KTR_MLD, "%s: msrcs is %d this packet", __func__,
2537 msrcs);
2538 pmr->mr_numsrc = htons(msrcs);
2539 nbytes += (msrcs * sizeof(struct in6_addr));
2540 }
2541
2542 if (is_source_query && msrcs == 0) {
2543 CTR1(KTR_MLD, "%s: no recorded sources to report", __func__);
2544 if (m != m0)
2545 m_freem(m);
2546 return (0);
2547 }
2548
2549 /*
2550 * We are good to go with first packet.
2551 */
2552 if (m != m0) {
2553 CTR1(KTR_MLD, "%s: enqueueing first packet", __func__);
2554 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2555 _IF_ENQUEUE(ifq, m);
2556 } else
2557 m->m_pkthdr.PH_vt.vt_nrecs++;
2558
2559 /*
2560 * No further work needed if no source list in packet(s).
2561 */
2562 if (!record_has_sources)
2563 return (nbytes);
2564
2565 /*
2566 * Whilst sources remain to be announced, we need to allocate
2567 * a new packet and fill out as many sources as will fit.
2568 * Always try for a cluster first.
2569 */
2570 while (nims != NULL) {
2571 if (_IF_QFULL(ifq)) {
2572 CTR1(KTR_MLD, "%s: outbound queue full", __func__);
2573 return (-ENOMEM);
2574 }
2575 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2576 if (m == NULL)
2577 m = m_gethdr(M_NOWAIT, MT_DATA);
2578 if (m == NULL)
2579 return (-ENOMEM);
2580 mld_save_context(m, ifp);
2581 md = m_getptr(m, 0, &off);
2582 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) + off);
2583 CTR1(KTR_MLD, "%s: allocated next packet", __func__);
2584
2585 if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
2586 if (m != m0)
2587 m_freem(m);
2588 CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
2589 return (-ENOMEM);
2590 }
2591 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2592 nbytes += sizeof(struct mldv2_record);
2593
2594 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2595 sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
2596
2597 msrcs = 0;
2598 RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
2599 CTR2(KTR_MLD, "%s: visit node %s",
2600 __func__, ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2601 now = im6s_get_mode(inm, ims, 1);
2602 if ((now != mode) ||
2603 (now == mode &&
2604 (!use_block_allow && mode == MCAST_UNDEFINED))) {
2605 CTR1(KTR_MLD, "%s: skip node", __func__);
2606 continue;
2607 }
2608 if (is_source_query && ims->im6s_stp == 0) {
2609 CTR1(KTR_MLD, "%s: skip unrecorded node",
2610 __func__);
2611 continue;
2612 }
2613 CTR1(KTR_MLD, "%s: append node", __func__);
2614 if (!m_append(m, sizeof(struct in6_addr),
2615 (void *)&ims->im6s_addr)) {
2616 if (m != m0)
2617 m_freem(m);
2618 CTR1(KTR_MLD, "%s: m_append() failed.",
2619 __func__);
2620 return (-ENOMEM);
2621 }
2622 ++msrcs;
2623 if (msrcs == m0srcs)
2624 break;
2625 }
2626 pmr->mr_numsrc = htons(msrcs);
2627 nbytes += (msrcs * sizeof(struct in6_addr));
2628
2629 CTR1(KTR_MLD, "%s: enqueueing next packet", __func__);
2630 _IF_ENQUEUE(ifq, m);
2631 }
2632
2633 return (nbytes);
2634 }
2635
2636 /*
2637 * Type used to mark record pass completion.
2638 * We exploit the fact we can cast to this easily from the
2639 * current filter modes on each ip_msource node.
2640 */
2641 typedef enum {
2642 REC_NONE = 0x00, /* MCAST_UNDEFINED */
2643 REC_ALLOW = 0x01, /* MCAST_INCLUDE */
2644 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */
2645 REC_FULL = REC_ALLOW | REC_BLOCK
2646 } rectype_t;
2647
2648 /*
2649 * Enqueue an MLDv2 filter list change to the given output queue.
2650 *
2651 * Source list filter state is held in an RB-tree. When the filter list
2652 * for a group is changed without changing its mode, we need to compute
2653 * the deltas between T0 and T1 for each source in the filter set,
2654 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records.
2655 *
2656 * As we may potentially queue two record types, and the entire R-B tree
2657 * needs to be walked at once, we break this out into its own function
2658 * so we can generate a tightly packed queue of packets.
2659 *
2660 * XXX This could be written to only use one tree walk, although that makes
2661 * serializing into the mbuf chains a bit harder. For now we do two walks
2662 * which makes things easier on us, and it may or may not be harder on
2663 * the L2 cache.
2664 *
2665 * If successful the size of all data appended to the queue is returned,
2666 * otherwise an error code less than zero is returned, or zero if
2667 * no record(s) were appended.
2668 */
2669 static int
2670 mld_v2_enqueue_filter_change(struct ifqueue *ifq, struct in6_multi *inm)
2671 {
2672 static const int MINRECLEN =
2673 sizeof(struct mldv2_record) + sizeof(struct in6_addr);
2674 struct ifnet *ifp;
2675 struct mldv2_record mr;
2676 struct mldv2_record *pmr;
2677 struct ip6_msource *ims, *nims;
2678 struct mbuf *m, *m0, *md;
2679 int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
2680 int nallow, nblock;
2681 uint8_t mode, now, then;
2682 rectype_t crt, drt, nrt;
2683 #ifdef KTR
2684 char ip6tbuf[INET6_ADDRSTRLEN];
2685 #endif
2686
2687 IN6_MULTI_LOCK_ASSERT();
2688
2689 if (inm->in6m_nsrc == 0 ||
2690 (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0))
2691 return (0);
2692
2693 ifp = inm->in6m_ifp; /* interface */
2694 mode = inm->in6m_st[1].iss_fmode; /* filter mode at t1 */
2695 crt = REC_NONE; /* current group record type */
2696 drt = REC_NONE; /* mask of completed group record types */
2697 nrt = REC_NONE; /* record type for current node */
2698 m0srcs = 0; /* # source which will fit in current mbuf chain */
2699 npbytes = 0; /* # of bytes appended this packet */
2700 nbytes = 0; /* # of bytes appended to group's state-change queue */
2701 rsrcs = 0; /* # sources encoded in current record */
2702 schanged = 0; /* # nodes encoded in overall filter change */
2703 nallow = 0; /* # of source entries in ALLOW_NEW */
2704 nblock = 0; /* # of source entries in BLOCK_OLD */
2705 nims = NULL; /* next tree node pointer */
2706
2707 /*
2708 * For each possible filter record mode.
2709 * The first kind of source we encounter tells us which
2710 * is the first kind of record we start appending.
2711 * If a node transitioned to UNDEFINED at t1, its mode is treated
2712 * as the inverse of the group's filter mode.
2713 */
2714 while (drt != REC_FULL) {
2715 do {
2716 m0 = ifq->ifq_tail;
2717 if (m0 != NULL &&
2718 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <=
2719 MLD_V2_REPORT_MAXRECS) &&
2720 (m0->m_pkthdr.len + MINRECLEN) <
2721 (ifp->if_mtu - MLD_MTUSPACE)) {
2722 m = m0;
2723 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
2724 sizeof(struct mldv2_record)) /
2725 sizeof(struct in6_addr);
2726 CTR1(KTR_MLD,
2727 "%s: use previous packet", __func__);
2728 } else {
2729 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2730 if (m == NULL)
2731 m = m_gethdr(M_NOWAIT, MT_DATA);
2732 if (m == NULL) {
2733 CTR1(KTR_MLD,
2734 "%s: m_get*() failed", __func__);
2735 return (-ENOMEM);
2736 }
2737 m->m_pkthdr.PH_vt.vt_nrecs = 0;
2738 mld_save_context(m, ifp);
2739 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2740 sizeof(struct mldv2_record)) /
2741 sizeof(struct in6_addr);
2742 npbytes = 0;
2743 CTR1(KTR_MLD,
2744 "%s: allocated new packet", __func__);
2745 }
2746 /*
2747 * Append the MLD group record header to the
2748 * current packet's data area.
2749 * Recalculate pointer to free space for next
2750 * group record, in case m_append() allocated
2751 * a new mbuf or cluster.
2752 */
2753 memset(&mr, 0, sizeof(mr));
2754 mr.mr_addr = inm->in6m_addr;
2755 in6_clearscope(&mr.mr_addr);
2756 if (!m_append(m, sizeof(mr), (void *)&mr)) {
2757 if (m != m0)
2758 m_freem(m);
2759 CTR1(KTR_MLD,
2760 "%s: m_append() failed", __func__);
2761 return (-ENOMEM);
2762 }
2763 npbytes += sizeof(struct mldv2_record);
2764 if (m != m0) {
2765 /* new packet; offset in chain */
2766 md = m_getptr(m, npbytes -
2767 sizeof(struct mldv2_record), &off);
2768 pmr = (struct mldv2_record *)(mtod(md,
2769 uint8_t *) + off);
2770 } else {
2771 /* current packet; offset from last append */
2772 md = m_last(m);
2773 pmr = (struct mldv2_record *)(mtod(md,
2774 uint8_t *) + md->m_len -
2775 sizeof(struct mldv2_record));
2776 }
2777 /*
2778 * Begin walking the tree for this record type
2779 * pass, or continue from where we left off
2780 * previously if we had to allocate a new packet.
2781 * Only report deltas in-mode at t1.
2782 * We need not report included sources as allowed
2783 * if we are in inclusive mode on the group,
2784 * however the converse is not true.
2785 */
2786 rsrcs = 0;
2787 if (nims == NULL) {
2788 nims = RB_MIN(ip6_msource_tree,
2789 &inm->in6m_srcs);
2790 }
2791 RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
2792 CTR2(KTR_MLD, "%s: visit node %s", __func__,
2793 ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2794 now = im6s_get_mode(inm, ims, 1);
2795 then = im6s_get_mode(inm, ims, 0);
2796 CTR3(KTR_MLD, "%s: mode: t0 %d, t1 %d",
2797 __func__, then, now);
2798 if (now == then) {
2799 CTR1(KTR_MLD,
2800 "%s: skip unchanged", __func__);
2801 continue;
2802 }
2803 if (mode == MCAST_EXCLUDE &&
2804 now == MCAST_INCLUDE) {
2805 CTR1(KTR_MLD,
2806 "%s: skip IN src on EX group",
2807 __func__);
2808 continue;
2809 }
2810 nrt = (rectype_t)now;
2811 if (nrt == REC_NONE)
2812 nrt = (rectype_t)(~mode & REC_FULL);
2813 if (schanged++ == 0) {
2814 crt = nrt;
2815 } else if (crt != nrt)
2816 continue;
2817 if (!m_append(m, sizeof(struct in6_addr),
2818 (void *)&ims->im6s_addr)) {
2819 if (m != m0)
2820 m_freem(m);
2821 CTR1(KTR_MLD,
2822 "%s: m_append() failed", __func__);
2823 return (-ENOMEM);
2824 }
2825 nallow += !!(crt == REC_ALLOW);
2826 nblock += !!(crt == REC_BLOCK);
2827 if (++rsrcs == m0srcs)
2828 break;
2829 }
2830 /*
2831 * If we did not append any tree nodes on this
2832 * pass, back out of allocations.
2833 */
2834 if (rsrcs == 0) {
2835 npbytes -= sizeof(struct mldv2_record);
2836 if (m != m0) {
2837 CTR1(KTR_MLD,
2838 "%s: m_free(m)", __func__);
2839 m_freem(m);
2840 } else {
2841 CTR1(KTR_MLD,
2842 "%s: m_adj(m, -mr)", __func__);
2843 m_adj(m, -((int)sizeof(
2844 struct mldv2_record)));
2845 }
2846 continue;
2847 }
2848 npbytes += (rsrcs * sizeof(struct in6_addr));
2849 if (crt == REC_ALLOW)
2850 pmr->mr_type = MLD_ALLOW_NEW_SOURCES;
2851 else if (crt == REC_BLOCK)
2852 pmr->mr_type = MLD_BLOCK_OLD_SOURCES;
2853 pmr->mr_numsrc = htons(rsrcs);
2854 /*
2855 * Count the new group record, and enqueue this
2856 * packet if it wasn't already queued.
2857 */
2858 m->m_pkthdr.PH_vt.vt_nrecs++;
2859 if (m != m0)
2860 _IF_ENQUEUE(ifq, m);
2861 nbytes += npbytes;
2862 } while (nims != NULL);
2863 drt |= crt;
2864 crt = (~crt & REC_FULL);
2865 }
2866
2867 CTR3(KTR_MLD, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__,
2868 nallow, nblock);
2869
2870 return (nbytes);
2871 }
2872
2873 static int
2874 mld_v2_merge_state_changes(struct in6_multi *inm, struct ifqueue *ifscq)
2875 {
2876 struct ifqueue *gq;
2877 struct mbuf *m; /* pending state-change */
2878 struct mbuf *m0; /* copy of pending state-change */
2879 struct mbuf *mt; /* last state-change in packet */
2880 int docopy, domerge;
2881 u_int recslen;
2882
2883 docopy = 0;
2884 domerge = 0;
2885 recslen = 0;
2886
2887 IN6_MULTI_LOCK_ASSERT();
2888 MLD_LOCK_ASSERT();
2889
2890 /*
2891 * If there are further pending retransmissions, make a writable
2892 * copy of each queued state-change message before merging.
2893 */
2894 if (inm->in6m_scrv > 0)
2895 docopy = 1;
2896
2897 gq = &inm->in6m_scq;
2898 #ifdef KTR
2899 if (gq->ifq_head == NULL) {
2900 CTR2(KTR_MLD, "%s: WARNING: queue for inm %p is empty",
2901 __func__, inm);
2902 }
2903 #endif
2904
2905 m = gq->ifq_head;
2906 while (m != NULL) {
2907 /*
2908 * Only merge the report into the current packet if
2909 * there is sufficient space to do so; an MLDv2 report
2910 * packet may only contain 65,535 group records.
2911 * Always use a simple mbuf chain concatentation to do this,
2912 * as large state changes for single groups may have
2913 * allocated clusters.
2914 */
2915 domerge = 0;
2916 mt = ifscq->ifq_tail;
2917 if (mt != NULL) {
2918 recslen = m_length(m, NULL);
2919
2920 if ((mt->m_pkthdr.PH_vt.vt_nrecs +
2921 m->m_pkthdr.PH_vt.vt_nrecs <=
2922 MLD_V2_REPORT_MAXRECS) &&
2923 (mt->m_pkthdr.len + recslen <=
2924 (inm->in6m_ifp->if_mtu - MLD_MTUSPACE)))
2925 domerge = 1;
2926 }
2927
2928 if (!domerge && _IF_QFULL(gq)) {
2929 CTR2(KTR_MLD,
2930 "%s: outbound queue full, skipping whole packet %p",
2931 __func__, m);
2932 mt = m->m_nextpkt;
2933 if (!docopy)
2934 m_freem(m);
2935 m = mt;
2936 continue;
2937 }
2938
2939 if (!docopy) {
2940 CTR2(KTR_MLD, "%s: dequeueing %p", __func__, m);
2941 _IF_DEQUEUE(gq, m0);
2942 m = m0->m_nextpkt;
2943 } else {
2944 CTR2(KTR_MLD, "%s: copying %p", __func__, m);
2945 m0 = m_dup(m, M_NOWAIT);
2946 if (m0 == NULL)
2947 return (ENOMEM);
2948 m0->m_nextpkt = NULL;
2949 m = m->m_nextpkt;
2950 }
2951
2952 if (!domerge) {
2953 CTR3(KTR_MLD, "%s: queueing %p to ifscq %p)",
2954 __func__, m0, ifscq);
2955 _IF_ENQUEUE(ifscq, m0);
2956 } else {
2957 struct mbuf *mtl; /* last mbuf of packet mt */
2958
2959 CTR3(KTR_MLD, "%s: merging %p with ifscq tail %p)",
2960 __func__, m0, mt);
2961
2962 mtl = m_last(mt);
2963 m0->m_flags &= ~M_PKTHDR;
2964 mt->m_pkthdr.len += recslen;
2965 mt->m_pkthdr.PH_vt.vt_nrecs +=
2966 m0->m_pkthdr.PH_vt.vt_nrecs;
2967
2968 mtl->m_next = m0;
2969 }
2970 }
2971
2972 return (0);
2973 }
2974
2975 /*
2976 * Respond to a pending MLDv2 General Query.
2977 */
2978 static void
2979 mld_v2_dispatch_general_query(struct mld_ifinfo *mli)
2980 {
2981 struct ifmultiaddr *ifma;
2982 struct ifnet *ifp;
2983 struct in6_multi *inm;
2984 int retval;
2985
2986 IN6_MULTI_LOCK_ASSERT();
2987 MLD_LOCK_ASSERT();
2988
2989 KASSERT(mli->mli_version == MLD_VERSION_2,
2990 ("%s: called when version %d", __func__, mli->mli_version));
2991
2992 ifp = mli->mli_ifp;
2993
2994 IF_ADDR_RLOCK(ifp);
2995 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2996 if (ifma->ifma_addr->sa_family != AF_INET6 ||
2997 ifma->ifma_protospec == NULL)
2998 continue;
2999
3000 inm = (struct in6_multi *)ifma->ifma_protospec;
3001 KASSERT(ifp == inm->in6m_ifp,
3002 ("%s: inconsistent ifp", __func__));
3003
3004 switch (inm->in6m_state) {
3005 case MLD_NOT_MEMBER:
3006 case MLD_SILENT_MEMBER:
3007 break;
3008 case MLD_REPORTING_MEMBER:
3009 case MLD_IDLE_MEMBER:
3010 case MLD_LAZY_MEMBER:
3011 case MLD_SLEEPING_MEMBER:
3012 case MLD_AWAKENING_MEMBER:
3013 inm->in6m_state = MLD_REPORTING_MEMBER;
3014 retval = mld_v2_enqueue_group_record(&mli->mli_gq,
3015 inm, 0, 0, 0, 0);
3016 CTR2(KTR_MLD, "%s: enqueue record = %d",
3017 __func__, retval);
3018 break;
3019 case MLD_G_QUERY_PENDING_MEMBER:
3020 case MLD_SG_QUERY_PENDING_MEMBER:
3021 case MLD_LEAVING_MEMBER:
3022 break;
3023 }
3024 }
3025 IF_ADDR_RUNLOCK(ifp);
3026
3027 mld_dispatch_queue(&mli->mli_gq, MLD_MAX_RESPONSE_BURST);
3028
3029 /*
3030 * Slew transmission of bursts over 500ms intervals.
3031 */
3032 if (mli->mli_gq.ifq_head != NULL) {
3033 mli->mli_v2_timer = 1 + MLD_RANDOM_DELAY(
3034 MLD_RESPONSE_BURST_INTERVAL);
3035 V_interface_timers_running6 = 1;
3036 }
3037 }
3038
3039 /*
3040 * Transmit the next pending message in the output queue.
3041 *
3042 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis.
3043 * MRT: Nothing needs to be done, as MLD traffic is always local to
3044 * a link and uses a link-scope multicast address.
3045 */
3046 static void
3047 mld_dispatch_packet(struct mbuf *m)
3048 {
3049 struct ip6_moptions im6o;
3050 struct ifnet *ifp;
3051 struct ifnet *oifp;
3052 struct mbuf *m0;
3053 struct mbuf *md;
3054 struct ip6_hdr *ip6;
3055 struct mld_hdr *mld;
3056 int error;
3057 int off;
3058 int type;
3059 uint32_t ifindex;
3060
3061 CTR2(KTR_MLD, "%s: transmit %p", __func__, m);
3062
3063 /*
3064 * Set VNET image pointer from enqueued mbuf chain
3065 * before doing anything else. Whilst we use interface
3066 * indexes to guard against interface detach, they are
3067 * unique to each VIMAGE and must be retrieved.
3068 */
3069 ifindex = mld_restore_context(m);
3070
3071 /*
3072 * Check if the ifnet still exists. This limits the scope of
3073 * any race in the absence of a global ifp lock for low cost
3074 * (an array lookup).
3075 */
3076 ifp = ifnet_byindex(ifindex);
3077 if (ifp == NULL) {
3078 CTR3(KTR_MLD, "%s: dropped %p as ifindex %u went away.",
3079 __func__, m, ifindex);
3080 m_freem(m);
3081 IP6STAT_INC(ip6s_noroute);
3082 goto out;
3083 }
3084
3085 im6o.im6o_multicast_hlim = 1;
3086 im6o.im6o_multicast_loop = (V_ip6_mrouter != NULL);
3087 im6o.im6o_multicast_ifp = ifp;
3088
3089 if (m->m_flags & M_MLDV1) {
3090 m0 = m;
3091 } else {
3092 m0 = mld_v2_encap_report(ifp, m);
3093 if (m0 == NULL) {
3094 CTR2(KTR_MLD, "%s: dropped %p", __func__, m);
3095 IP6STAT_INC(ip6s_odropped);
3096 goto out;
3097 }
3098 }
3099
3100 mld_scrub_context(m0);
3101 m_clrprotoflags(m);
3102 m0->m_pkthdr.rcvif = V_loif;
3103
3104 ip6 = mtod(m0, struct ip6_hdr *);
3105 #if 0
3106 (void)in6_setscope(&ip6->ip6_dst, ifp, NULL); /* XXX LOR */
3107 #else
3108 /*
3109 * XXX XXX Break some KPI rules to prevent an LOR which would
3110 * occur if we called in6_setscope() at transmission.
3111 * See comments at top of file.
3112 */
3113 MLD_EMBEDSCOPE(&ip6->ip6_dst, ifp->if_index);
3114 #endif
3115
3116 /*
3117 * Retrieve the ICMPv6 type before handoff to ip6_output(),
3118 * so we can bump the stats.
3119 */
3120 md = m_getptr(m0, sizeof(struct ip6_hdr), &off);
3121 mld = (struct mld_hdr *)(mtod(md, uint8_t *) + off);
3122 type = mld->mld_type;
3123
3124 error = ip6_output(m0, &mld_po, NULL, IPV6_UNSPECSRC, &im6o,
3125 &oifp, NULL);
3126 if (error) {
3127 CTR3(KTR_MLD, "%s: ip6_output(%p) = %d", __func__, m0, error);
3128 goto out;
3129 }
3130 ICMP6STAT_INC(icp6s_outhist[type]);
3131 if (oifp != NULL) {
3132 icmp6_ifstat_inc(oifp, ifs6_out_msg);
3133 switch (type) {
3134 case MLD_LISTENER_REPORT:
3135 case MLDV2_LISTENER_REPORT:
3136 icmp6_ifstat_inc(oifp, ifs6_out_mldreport);
3137 break;
3138 case MLD_LISTENER_DONE:
3139 icmp6_ifstat_inc(oifp, ifs6_out_mlddone);
3140 break;
3141 }
3142 }
3143 out:
3144 return;
3145 }
3146
3147 /*
3148 * Encapsulate an MLDv2 report.
3149 *
3150 * KAME IPv6 requires that hop-by-hop options be passed separately,
3151 * and that the IPv6 header be prepended in a separate mbuf.
3152 *
3153 * Returns a pointer to the new mbuf chain head, or NULL if the
3154 * allocation failed.
3155 */
3156 static struct mbuf *
3157 mld_v2_encap_report(struct ifnet *ifp, struct mbuf *m)
3158 {
3159 struct mbuf *mh;
3160 struct mldv2_report *mld;
3161 struct ip6_hdr *ip6;
3162 struct in6_ifaddr *ia;
3163 int mldreclen;
3164
3165 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
3166 KASSERT((m->m_flags & M_PKTHDR),
3167 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m));
3168
3169 /*
3170 * RFC3590: OK to send as :: or tentative during DAD.
3171 */
3172 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
3173 if (ia == NULL)
3174 CTR1(KTR_MLD, "%s: warning: ia is NULL", __func__);
3175
3176 mh = m_gethdr(M_NOWAIT, MT_DATA);
3177 if (mh == NULL) {
3178 if (ia != NULL)
3179 ifa_free(&ia->ia_ifa);
3180 m_freem(m);
3181 return (NULL);
3182 }
3183 MH_ALIGN(mh, sizeof(struct ip6_hdr) + sizeof(struct mldv2_report));
3184
3185 mldreclen = m_length(m, NULL);
3186 CTR2(KTR_MLD, "%s: mldreclen is %d", __func__, mldreclen);
3187
3188 mh->m_len = sizeof(struct ip6_hdr) + sizeof(struct mldv2_report);
3189 mh->m_pkthdr.len = sizeof(struct ip6_hdr) +
3190 sizeof(struct mldv2_report) + mldreclen;
3191
3192 ip6 = mtod(mh, struct ip6_hdr *);
3193 ip6->ip6_flow = 0;
3194 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
3195 ip6->ip6_vfc |= IPV6_VERSION;
3196 ip6->ip6_nxt = IPPROTO_ICMPV6;
3197 ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
3198 if (ia != NULL)
3199 ifa_free(&ia->ia_ifa);
3200 ip6->ip6_dst = in6addr_linklocal_allv2routers;
3201 /* scope ID will be set in netisr */
3202
3203 mld = (struct mldv2_report *)(ip6 + 1);
3204 mld->mld_type = MLDV2_LISTENER_REPORT;
3205 mld->mld_code = 0;
3206 mld->mld_cksum = 0;
3207 mld->mld_v2_reserved = 0;
3208 mld->mld_v2_numrecs = htons(m->m_pkthdr.PH_vt.vt_nrecs);
3209 m->m_pkthdr.PH_vt.vt_nrecs = 0;
3210
3211 mh->m_next = m;
3212 mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
3213 sizeof(struct ip6_hdr), sizeof(struct mldv2_report) + mldreclen);
3214 return (mh);
3215 }
3216
3217 #ifdef KTR
3218 static char *
3219 mld_rec_type_to_str(const int type)
3220 {
3221
3222 switch (type) {
3223 case MLD_CHANGE_TO_EXCLUDE_MODE:
3224 return "TO_EX";
3225 break;
3226 case MLD_CHANGE_TO_INCLUDE_MODE:
3227 return "TO_IN";
3228 break;
3229 case MLD_MODE_IS_EXCLUDE:
3230 return "MODE_EX";
3231 break;
3232 case MLD_MODE_IS_INCLUDE:
3233 return "MODE_IN";
3234 break;
3235 case MLD_ALLOW_NEW_SOURCES:
3236 return "ALLOW_NEW";
3237 break;
3238 case MLD_BLOCK_OLD_SOURCES:
3239 return "BLOCK_OLD";
3240 break;
3241 default:
3242 break;
3243 }
3244 return "unknown";
3245 }
3246 #endif
3247
3248 static void
3249 mld_init(void *unused __unused)
3250 {
3251
3252 CTR1(KTR_MLD, "%s: initializing", __func__);
3253 MLD_LOCK_INIT();
3254
3255 ip6_initpktopts(&mld_po);
3256 mld_po.ip6po_hlim = 1;
3257 mld_po.ip6po_hbh = &mld_ra.hbh;
3258 mld_po.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER;
3259 mld_po.ip6po_flags = IP6PO_DONTFRAG;
3260 }
3261 SYSINIT(mld_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_init, NULL);
3262
3263 static void
3264 mld_uninit(void *unused __unused)
3265 {
3266
3267 CTR1(KTR_MLD, "%s: tearing down", __func__);
3268 MLD_LOCK_DESTROY();
3269 }
3270 SYSUNINIT(mld_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_uninit, NULL);
3271
3272 static void
3273 vnet_mld_init(const void *unused __unused)
3274 {
3275
3276 CTR1(KTR_MLD, "%s: initializing", __func__);
3277
3278 LIST_INIT(&V_mli_head);
3279 }
3280 VNET_SYSINIT(vnet_mld_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_init,
3281 NULL);
3282
3283 static void
3284 vnet_mld_uninit(const void *unused __unused)
3285 {
3286
3287 CTR1(KTR_MLD, "%s: tearing down", __func__);
3288
3289 KASSERT(LIST_EMPTY(&V_mli_head),
3290 ("%s: mli list not empty; ifnets not detached?", __func__));
3291 }
3292 VNET_SYSUNINIT(vnet_mld_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_uninit,
3293 NULL);
3294
3295 static int
3296 mld_modevent(module_t mod, int type, void *unused __unused)
3297 {
3298
3299 switch (type) {
3300 case MOD_LOAD:
3301 case MOD_UNLOAD:
3302 break;
3303 default:
3304 return (EOPNOTSUPP);
3305 }
3306 return (0);
3307 }
3308
3309 static moduledata_t mld_mod = {
3310 "mld",
3311 mld_modevent,
3312 0
3313 };
3314 DECLARE_MODULE(mld, mld_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: bc235b4df997741e192c0d78acd1ed1c
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