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Merge tag 'perf-urgent-for-mingo-4.10-20170203' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-zesty-kernel.git] / net / ipv6 / mcast.c
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <linux/pkt_sched.h>
48 #include <net/mld.h>
49
50 #include <linux/netfilter.h>
51 #include <linux/netfilter_ipv6.h>
52
53 #include <net/net_namespace.h>
54 #include <net/sock.h>
55 #include <net/snmp.h>
56
57 #include <net/ipv6.h>
58 #include <net/protocol.h>
59 #include <net/if_inet6.h>
60 #include <net/ndisc.h>
61 #include <net/addrconf.h>
62 #include <net/ip6_route.h>
63 #include <net/inet_common.h>
64
65 #include <net/ip6_checksum.h>
66
67 /* Ensure that we have struct in6_addr aligned on 32bit word. */
68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
72 };
73
74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
75
76 static void igmp6_join_group(struct ifmcaddr6 *ma);
77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
78 static void igmp6_timer_handler(unsigned long data);
79
80 static void mld_gq_timer_expire(unsigned long data);
81 static void mld_ifc_timer_expire(unsigned long data);
82 static void mld_ifc_event(struct inet6_dev *idev);
83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
84 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
85 static void mld_clear_delrec(struct inet6_dev *idev);
86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
87 static int sf_setstate(struct ifmcaddr6 *pmc);
88 static void sf_markstate(struct ifmcaddr6 *pmc);
89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
91 int sfmode, int sfcount, const struct in6_addr *psfsrc,
92 int delta);
93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
94 int sfmode, int sfcount, const struct in6_addr *psfsrc,
95 int delta);
96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
97 struct inet6_dev *idev);
98
99 #define MLD_QRV_DEFAULT 2
100 /* RFC3810, 9.2. Query Interval */
101 #define MLD_QI_DEFAULT (125 * HZ)
102 /* RFC3810, 9.3. Query Response Interval */
103 #define MLD_QRI_DEFAULT (10 * HZ)
104
105 /* RFC3810, 8.1 Query Version Distinctions */
106 #define MLD_V1_QUERY_LEN 24
107 #define MLD_V2_QUERY_LEN_MIN 28
108
109 #define IPV6_MLD_MAX_MSF 64
110
111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
113
114 /*
115 * socket join on multicast group
116 */
117
118 #define for_each_pmc_rcu(np, pmc) \
119 for (pmc = rcu_dereference(np->ipv6_mc_list); \
120 pmc != NULL; \
121 pmc = rcu_dereference(pmc->next))
122
123 static int unsolicited_report_interval(struct inet6_dev *idev)
124 {
125 int iv;
126
127 if (mld_in_v1_mode(idev))
128 iv = idev->cnf.mldv1_unsolicited_report_interval;
129 else
130 iv = idev->cnf.mldv2_unsolicited_report_interval;
131
132 return iv > 0 ? iv : 1;
133 }
134
135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
136 {
137 struct net_device *dev = NULL;
138 struct ipv6_mc_socklist *mc_lst;
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct net *net = sock_net(sk);
141 int err;
142
143 ASSERT_RTNL();
144
145 if (!ipv6_addr_is_multicast(addr))
146 return -EINVAL;
147
148 rcu_read_lock();
149 for_each_pmc_rcu(np, mc_lst) {
150 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
151 ipv6_addr_equal(&mc_lst->addr, addr)) {
152 rcu_read_unlock();
153 return -EADDRINUSE;
154 }
155 }
156 rcu_read_unlock();
157
158 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
159
160 if (!mc_lst)
161 return -ENOMEM;
162
163 mc_lst->next = NULL;
164 mc_lst->addr = *addr;
165
166 if (ifindex == 0) {
167 struct rt6_info *rt;
168 rt = rt6_lookup(net, addr, NULL, 0, 0);
169 if (rt) {
170 dev = rt->dst.dev;
171 ip6_rt_put(rt);
172 }
173 } else
174 dev = __dev_get_by_index(net, ifindex);
175
176 if (!dev) {
177 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
178 return -ENODEV;
179 }
180
181 mc_lst->ifindex = dev->ifindex;
182 mc_lst->sfmode = MCAST_EXCLUDE;
183 rwlock_init(&mc_lst->sflock);
184 mc_lst->sflist = NULL;
185
186 /*
187 * now add/increase the group membership on the device
188 */
189
190 err = ipv6_dev_mc_inc(dev, addr);
191
192 if (err) {
193 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
194 return err;
195 }
196
197 mc_lst->next = np->ipv6_mc_list;
198 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
199
200 return 0;
201 }
202 EXPORT_SYMBOL(ipv6_sock_mc_join);
203
204 /*
205 * socket leave on multicast group
206 */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
212 struct net *net = sock_net(sk);
213
214 ASSERT_RTNL();
215
216 if (!ipv6_addr_is_multicast(addr))
217 return -EINVAL;
218
219 for (lnk = &np->ipv6_mc_list;
220 (mc_lst = rtnl_dereference(*lnk)) != NULL;
221 lnk = &mc_lst->next) {
222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 ipv6_addr_equal(&mc_lst->addr, addr)) {
224 struct net_device *dev;
225
226 *lnk = mc_lst->next;
227
228 dev = __dev_get_by_index(net, mc_lst->ifindex);
229 if (dev) {
230 struct inet6_dev *idev = __in6_dev_get(dev);
231
232 (void) ip6_mc_leave_src(sk, mc_lst, idev);
233 if (idev)
234 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
235 } else
236 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
237
238 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
239 kfree_rcu(mc_lst, rcu);
240 return 0;
241 }
242 }
243
244 return -EADDRNOTAVAIL;
245 }
246 EXPORT_SYMBOL(ipv6_sock_mc_drop);
247
248 /* called with rcu_read_lock() */
249 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
250 const struct in6_addr *group,
251 int ifindex)
252 {
253 struct net_device *dev = NULL;
254 struct inet6_dev *idev = NULL;
255
256 if (ifindex == 0) {
257 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
258
259 if (rt) {
260 dev = rt->dst.dev;
261 ip6_rt_put(rt);
262 }
263 } else
264 dev = dev_get_by_index_rcu(net, ifindex);
265
266 if (!dev)
267 return NULL;
268 idev = __in6_dev_get(dev);
269 if (!idev)
270 return NULL;
271 read_lock_bh(&idev->lock);
272 if (idev->dead) {
273 read_unlock_bh(&idev->lock);
274 return NULL;
275 }
276 return idev;
277 }
278
279 void __ipv6_sock_mc_close(struct sock *sk)
280 {
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct ipv6_mc_socklist *mc_lst;
283 struct net *net = sock_net(sk);
284
285 ASSERT_RTNL();
286
287 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
288 struct net_device *dev;
289
290 np->ipv6_mc_list = mc_lst->next;
291
292 dev = __dev_get_by_index(net, mc_lst->ifindex);
293 if (dev) {
294 struct inet6_dev *idev = __in6_dev_get(dev);
295
296 (void) ip6_mc_leave_src(sk, mc_lst, idev);
297 if (idev)
298 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
299 } else
300 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
301
302 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
303 kfree_rcu(mc_lst, rcu);
304 }
305 }
306
307 void ipv6_sock_mc_close(struct sock *sk)
308 {
309 struct ipv6_pinfo *np = inet6_sk(sk);
310
311 if (!rcu_access_pointer(np->ipv6_mc_list))
312 return;
313 rtnl_lock();
314 __ipv6_sock_mc_close(sk);
315 rtnl_unlock();
316 }
317
318 int ip6_mc_source(int add, int omode, struct sock *sk,
319 struct group_source_req *pgsr)
320 {
321 struct in6_addr *source, *group;
322 struct ipv6_mc_socklist *pmc;
323 struct inet6_dev *idev;
324 struct ipv6_pinfo *inet6 = inet6_sk(sk);
325 struct ip6_sf_socklist *psl;
326 struct net *net = sock_net(sk);
327 int i, j, rv;
328 int leavegroup = 0;
329 int pmclocked = 0;
330 int err;
331
332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
334
335 if (!ipv6_addr_is_multicast(group))
336 return -EINVAL;
337
338 rcu_read_lock();
339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
340 if (!idev) {
341 rcu_read_unlock();
342 return -ENODEV;
343 }
344
345 err = -EADDRNOTAVAIL;
346
347 for_each_pmc_rcu(inet6, pmc) {
348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
349 continue;
350 if (ipv6_addr_equal(&pmc->addr, group))
351 break;
352 }
353 if (!pmc) { /* must have a prior join */
354 err = -EINVAL;
355 goto done;
356 }
357 /* if a source filter was set, must be the same mode as before */
358 if (pmc->sflist) {
359 if (pmc->sfmode != omode) {
360 err = -EINVAL;
361 goto done;
362 }
363 } else if (pmc->sfmode != omode) {
364 /* allow mode switches for empty-set filters */
365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
367 pmc->sfmode = omode;
368 }
369
370 write_lock(&pmc->sflock);
371 pmclocked = 1;
372
373 psl = pmc->sflist;
374 if (!add) {
375 if (!psl)
376 goto done; /* err = -EADDRNOTAVAIL */
377 rv = !0;
378 for (i = 0; i < psl->sl_count; i++) {
379 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
380 if (rv == 0)
381 break;
382 }
383 if (rv) /* source not found */
384 goto done; /* err = -EADDRNOTAVAIL */
385
386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
388 leavegroup = 1;
389 goto done;
390 }
391
392 /* update the interface filter */
393 ip6_mc_del_src(idev, group, omode, 1, source, 1);
394
395 for (j = i+1; j < psl->sl_count; j++)
396 psl->sl_addr[j-1] = psl->sl_addr[j];
397 psl->sl_count--;
398 err = 0;
399 goto done;
400 }
401 /* else, add a new source to the filter */
402
403 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
404 err = -ENOBUFS;
405 goto done;
406 }
407 if (!psl || psl->sl_count == psl->sl_max) {
408 struct ip6_sf_socklist *newpsl;
409 int count = IP6_SFBLOCK;
410
411 if (psl)
412 count += psl->sl_max;
413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
414 if (!newpsl) {
415 err = -ENOBUFS;
416 goto done;
417 }
418 newpsl->sl_max = count;
419 newpsl->sl_count = count - IP6_SFBLOCK;
420 if (psl) {
421 for (i = 0; i < psl->sl_count; i++)
422 newpsl->sl_addr[i] = psl->sl_addr[i];
423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
424 }
425 pmc->sflist = psl = newpsl;
426 }
427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
428 for (i = 0; i < psl->sl_count; i++) {
429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
430 if (rv == 0) /* There is an error in the address. */
431 goto done;
432 }
433 for (j = psl->sl_count-1; j >= i; j--)
434 psl->sl_addr[j+1] = psl->sl_addr[j];
435 psl->sl_addr[i] = *source;
436 psl->sl_count++;
437 err = 0;
438 /* update the interface list */
439 ip6_mc_add_src(idev, group, omode, 1, source, 1);
440 done:
441 if (pmclocked)
442 write_unlock(&pmc->sflock);
443 read_unlock_bh(&idev->lock);
444 rcu_read_unlock();
445 if (leavegroup)
446 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
447 return err;
448 }
449
450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
451 {
452 const struct in6_addr *group;
453 struct ipv6_mc_socklist *pmc;
454 struct inet6_dev *idev;
455 struct ipv6_pinfo *inet6 = inet6_sk(sk);
456 struct ip6_sf_socklist *newpsl, *psl;
457 struct net *net = sock_net(sk);
458 int leavegroup = 0;
459 int i, err;
460
461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
462
463 if (!ipv6_addr_is_multicast(group))
464 return -EINVAL;
465 if (gsf->gf_fmode != MCAST_INCLUDE &&
466 gsf->gf_fmode != MCAST_EXCLUDE)
467 return -EINVAL;
468
469 rcu_read_lock();
470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
471
472 if (!idev) {
473 rcu_read_unlock();
474 return -ENODEV;
475 }
476
477 err = 0;
478
479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
480 leavegroup = 1;
481 goto done;
482 }
483
484 for_each_pmc_rcu(inet6, pmc) {
485 if (pmc->ifindex != gsf->gf_interface)
486 continue;
487 if (ipv6_addr_equal(&pmc->addr, group))
488 break;
489 }
490 if (!pmc) { /* must have a prior join */
491 err = -EINVAL;
492 goto done;
493 }
494 if (gsf->gf_numsrc) {
495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
496 GFP_ATOMIC);
497 if (!newpsl) {
498 err = -ENOBUFS;
499 goto done;
500 }
501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
502 for (i = 0; i < newpsl->sl_count; ++i) {
503 struct sockaddr_in6 *psin6;
504
505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
506 newpsl->sl_addr[i] = psin6->sin6_addr;
507 }
508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
509 newpsl->sl_count, newpsl->sl_addr, 0);
510 if (err) {
511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
512 goto done;
513 }
514 } else {
515 newpsl = NULL;
516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
517 }
518
519 write_lock(&pmc->sflock);
520 psl = pmc->sflist;
521 if (psl) {
522 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
523 psl->sl_count, psl->sl_addr, 0);
524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
525 } else
526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
527 pmc->sflist = newpsl;
528 pmc->sfmode = gsf->gf_fmode;
529 write_unlock(&pmc->sflock);
530 err = 0;
531 done:
532 read_unlock_bh(&idev->lock);
533 rcu_read_unlock();
534 if (leavegroup)
535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
536 return err;
537 }
538
539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
540 struct group_filter __user *optval, int __user *optlen)
541 {
542 int err, i, count, copycount;
543 const struct in6_addr *group;
544 struct ipv6_mc_socklist *pmc;
545 struct inet6_dev *idev;
546 struct ipv6_pinfo *inet6 = inet6_sk(sk);
547 struct ip6_sf_socklist *psl;
548 struct net *net = sock_net(sk);
549
550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
551
552 if (!ipv6_addr_is_multicast(group))
553 return -EINVAL;
554
555 rcu_read_lock();
556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
557
558 if (!idev) {
559 rcu_read_unlock();
560 return -ENODEV;
561 }
562
563 err = -EADDRNOTAVAIL;
564 /* changes to the ipv6_mc_list require the socket lock and
565 * rtnl lock. We have the socket lock and rcu read lock,
566 * so reading the list is safe.
567 */
568
569 for_each_pmc_rcu(inet6, pmc) {
570 if (pmc->ifindex != gsf->gf_interface)
571 continue;
572 if (ipv6_addr_equal(group, &pmc->addr))
573 break;
574 }
575 if (!pmc) /* must have a prior join */
576 goto done;
577 gsf->gf_fmode = pmc->sfmode;
578 psl = pmc->sflist;
579 count = psl ? psl->sl_count : 0;
580 read_unlock_bh(&idev->lock);
581 rcu_read_unlock();
582
583 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
584 gsf->gf_numsrc = count;
585 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
586 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
587 return -EFAULT;
588 }
589 /* changes to psl require the socket lock, and a write lock
590 * on pmc->sflock. We have the socket lock so reading here is safe.
591 */
592 for (i = 0; i < copycount; i++) {
593 struct sockaddr_in6 *psin6;
594 struct sockaddr_storage ss;
595
596 psin6 = (struct sockaddr_in6 *)&ss;
597 memset(&ss, 0, sizeof(ss));
598 psin6->sin6_family = AF_INET6;
599 psin6->sin6_addr = psl->sl_addr[i];
600 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
601 return -EFAULT;
602 }
603 return 0;
604 done:
605 read_unlock_bh(&idev->lock);
606 rcu_read_unlock();
607 return err;
608 }
609
610 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
611 const struct in6_addr *src_addr)
612 {
613 struct ipv6_pinfo *np = inet6_sk(sk);
614 struct ipv6_mc_socklist *mc;
615 struct ip6_sf_socklist *psl;
616 bool rv = true;
617
618 rcu_read_lock();
619 for_each_pmc_rcu(np, mc) {
620 if (ipv6_addr_equal(&mc->addr, mc_addr))
621 break;
622 }
623 if (!mc) {
624 rcu_read_unlock();
625 return true;
626 }
627 read_lock(&mc->sflock);
628 psl = mc->sflist;
629 if (!psl) {
630 rv = mc->sfmode == MCAST_EXCLUDE;
631 } else {
632 int i;
633
634 for (i = 0; i < psl->sl_count; i++) {
635 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
636 break;
637 }
638 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
639 rv = false;
640 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
641 rv = false;
642 }
643 read_unlock(&mc->sflock);
644 rcu_read_unlock();
645
646 return rv;
647 }
648
649 static void igmp6_group_added(struct ifmcaddr6 *mc)
650 {
651 struct net_device *dev = mc->idev->dev;
652 char buf[MAX_ADDR_LEN];
653
654 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
655 IPV6_ADDR_SCOPE_LINKLOCAL)
656 return;
657
658 spin_lock_bh(&mc->mca_lock);
659 if (!(mc->mca_flags&MAF_LOADED)) {
660 mc->mca_flags |= MAF_LOADED;
661 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
662 dev_mc_add(dev, buf);
663 }
664 spin_unlock_bh(&mc->mca_lock);
665
666 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
667 return;
668
669 if (mld_in_v1_mode(mc->idev)) {
670 igmp6_join_group(mc);
671 return;
672 }
673 /* else v2 */
674
675 mc->mca_crcount = mc->idev->mc_qrv;
676 mld_ifc_event(mc->idev);
677 }
678
679 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
680 {
681 struct net_device *dev = mc->idev->dev;
682 char buf[MAX_ADDR_LEN];
683
684 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
685 IPV6_ADDR_SCOPE_LINKLOCAL)
686 return;
687
688 spin_lock_bh(&mc->mca_lock);
689 if (mc->mca_flags&MAF_LOADED) {
690 mc->mca_flags &= ~MAF_LOADED;
691 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
692 dev_mc_del(dev, buf);
693 }
694
695 spin_unlock_bh(&mc->mca_lock);
696 if (mc->mca_flags & MAF_NOREPORT)
697 return;
698
699 if (!mc->idev->dead)
700 igmp6_leave_group(mc);
701
702 spin_lock_bh(&mc->mca_lock);
703 if (del_timer(&mc->mca_timer))
704 atomic_dec(&mc->mca_refcnt);
705 spin_unlock_bh(&mc->mca_lock);
706 }
707
708 /*
709 * deleted ifmcaddr6 manipulation
710 */
711 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
712 {
713 struct ifmcaddr6 *pmc;
714
715 /* this is an "ifmcaddr6" for convenience; only the fields below
716 * are actually used. In particular, the refcnt and users are not
717 * used for management of the delete list. Using the same structure
718 * for deleted items allows change reports to use common code with
719 * non-deleted or query-response MCA's.
720 */
721 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
722 if (!pmc)
723 return;
724
725 spin_lock_bh(&im->mca_lock);
726 spin_lock_init(&pmc->mca_lock);
727 pmc->idev = im->idev;
728 in6_dev_hold(idev);
729 pmc->mca_addr = im->mca_addr;
730 pmc->mca_crcount = idev->mc_qrv;
731 pmc->mca_sfmode = im->mca_sfmode;
732 if (pmc->mca_sfmode == MCAST_INCLUDE) {
733 struct ip6_sf_list *psf;
734
735 pmc->mca_tomb = im->mca_tomb;
736 pmc->mca_sources = im->mca_sources;
737 im->mca_tomb = im->mca_sources = NULL;
738 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
739 psf->sf_crcount = pmc->mca_crcount;
740 }
741 spin_unlock_bh(&im->mca_lock);
742
743 spin_lock_bh(&idev->mc_lock);
744 pmc->next = idev->mc_tomb;
745 idev->mc_tomb = pmc;
746 spin_unlock_bh(&idev->mc_lock);
747 }
748
749 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
750 {
751 struct ifmcaddr6 *pmc, *pmc_prev;
752 struct ip6_sf_list *psf;
753 struct in6_addr *pmca = &im->mca_addr;
754
755 spin_lock_bh(&idev->mc_lock);
756 pmc_prev = NULL;
757 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
758 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
759 break;
760 pmc_prev = pmc;
761 }
762 if (pmc) {
763 if (pmc_prev)
764 pmc_prev->next = pmc->next;
765 else
766 idev->mc_tomb = pmc->next;
767 }
768 spin_unlock_bh(&idev->mc_lock);
769
770 spin_lock_bh(&im->mca_lock);
771 if (pmc) {
772 im->idev = pmc->idev;
773 im->mca_crcount = idev->mc_qrv;
774 im->mca_sfmode = pmc->mca_sfmode;
775 if (pmc->mca_sfmode == MCAST_INCLUDE) {
776 im->mca_tomb = pmc->mca_tomb;
777 im->mca_sources = pmc->mca_sources;
778 for (psf = im->mca_sources; psf; psf = psf->sf_next)
779 psf->sf_crcount = im->mca_crcount;
780 }
781 in6_dev_put(pmc->idev);
782 }
783 spin_unlock_bh(&im->mca_lock);
784 }
785
786 static void mld_clear_delrec(struct inet6_dev *idev)
787 {
788 struct ifmcaddr6 *pmc, *nextpmc;
789
790 spin_lock_bh(&idev->mc_lock);
791 pmc = idev->mc_tomb;
792 idev->mc_tomb = NULL;
793 spin_unlock_bh(&idev->mc_lock);
794
795 for (; pmc; pmc = nextpmc) {
796 nextpmc = pmc->next;
797 ip6_mc_clear_src(pmc);
798 in6_dev_put(pmc->idev);
799 kfree(pmc);
800 }
801
802 /* clear dead sources, too */
803 read_lock_bh(&idev->lock);
804 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
805 struct ip6_sf_list *psf, *psf_next;
806
807 spin_lock_bh(&pmc->mca_lock);
808 psf = pmc->mca_tomb;
809 pmc->mca_tomb = NULL;
810 spin_unlock_bh(&pmc->mca_lock);
811 for (; psf; psf = psf_next) {
812 psf_next = psf->sf_next;
813 kfree(psf);
814 }
815 }
816 read_unlock_bh(&idev->lock);
817 }
818
819 static void mca_get(struct ifmcaddr6 *mc)
820 {
821 atomic_inc(&mc->mca_refcnt);
822 }
823
824 static void ma_put(struct ifmcaddr6 *mc)
825 {
826 if (atomic_dec_and_test(&mc->mca_refcnt)) {
827 in6_dev_put(mc->idev);
828 kfree(mc);
829 }
830 }
831
832 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
833 const struct in6_addr *addr)
834 {
835 struct ifmcaddr6 *mc;
836
837 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
838 if (!mc)
839 return NULL;
840
841 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
842
843 mc->mca_addr = *addr;
844 mc->idev = idev; /* reference taken by caller */
845 mc->mca_users = 1;
846 /* mca_stamp should be updated upon changes */
847 mc->mca_cstamp = mc->mca_tstamp = jiffies;
848 atomic_set(&mc->mca_refcnt, 1);
849 spin_lock_init(&mc->mca_lock);
850
851 /* initial mode is (EX, empty) */
852 mc->mca_sfmode = MCAST_EXCLUDE;
853 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
854
855 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
856 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
857 mc->mca_flags |= MAF_NOREPORT;
858
859 return mc;
860 }
861
862 /*
863 * device multicast group inc (add if not found)
864 */
865 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
866 {
867 struct ifmcaddr6 *mc;
868 struct inet6_dev *idev;
869
870 ASSERT_RTNL();
871
872 /* we need to take a reference on idev */
873 idev = in6_dev_get(dev);
874
875 if (!idev)
876 return -EINVAL;
877
878 write_lock_bh(&idev->lock);
879 if (idev->dead) {
880 write_unlock_bh(&idev->lock);
881 in6_dev_put(idev);
882 return -ENODEV;
883 }
884
885 for (mc = idev->mc_list; mc; mc = mc->next) {
886 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
887 mc->mca_users++;
888 write_unlock_bh(&idev->lock);
889 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
890 NULL, 0);
891 in6_dev_put(idev);
892 return 0;
893 }
894 }
895
896 mc = mca_alloc(idev, addr);
897 if (!mc) {
898 write_unlock_bh(&idev->lock);
899 in6_dev_put(idev);
900 return -ENOMEM;
901 }
902
903 mc->next = idev->mc_list;
904 idev->mc_list = mc;
905
906 /* Hold this for the code below before we unlock,
907 * it is already exposed via idev->mc_list.
908 */
909 mca_get(mc);
910 write_unlock_bh(&idev->lock);
911
912 mld_del_delrec(idev, mc);
913 igmp6_group_added(mc);
914 ma_put(mc);
915 return 0;
916 }
917
918 /*
919 * device multicast group del
920 */
921 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
922 {
923 struct ifmcaddr6 *ma, **map;
924
925 ASSERT_RTNL();
926
927 write_lock_bh(&idev->lock);
928 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
929 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
930 if (--ma->mca_users == 0) {
931 *map = ma->next;
932 write_unlock_bh(&idev->lock);
933
934 igmp6_group_dropped(ma);
935 ip6_mc_clear_src(ma);
936
937 ma_put(ma);
938 return 0;
939 }
940 write_unlock_bh(&idev->lock);
941 return 0;
942 }
943 }
944 write_unlock_bh(&idev->lock);
945
946 return -ENOENT;
947 }
948
949 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
950 {
951 struct inet6_dev *idev;
952 int err;
953
954 ASSERT_RTNL();
955
956 idev = __in6_dev_get(dev);
957 if (!idev)
958 err = -ENODEV;
959 else
960 err = __ipv6_dev_mc_dec(idev, addr);
961
962 return err;
963 }
964
965 /*
966 * check if the interface/address pair is valid
967 */
968 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
969 const struct in6_addr *src_addr)
970 {
971 struct inet6_dev *idev;
972 struct ifmcaddr6 *mc;
973 bool rv = false;
974
975 rcu_read_lock();
976 idev = __in6_dev_get(dev);
977 if (idev) {
978 read_lock_bh(&idev->lock);
979 for (mc = idev->mc_list; mc; mc = mc->next) {
980 if (ipv6_addr_equal(&mc->mca_addr, group))
981 break;
982 }
983 if (mc) {
984 if (src_addr && !ipv6_addr_any(src_addr)) {
985 struct ip6_sf_list *psf;
986
987 spin_lock_bh(&mc->mca_lock);
988 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
989 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
990 break;
991 }
992 if (psf)
993 rv = psf->sf_count[MCAST_INCLUDE] ||
994 psf->sf_count[MCAST_EXCLUDE] !=
995 mc->mca_sfcount[MCAST_EXCLUDE];
996 else
997 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
998 spin_unlock_bh(&mc->mca_lock);
999 } else
1000 rv = true; /* don't filter unspecified source */
1001 }
1002 read_unlock_bh(&idev->lock);
1003 }
1004 rcu_read_unlock();
1005 return rv;
1006 }
1007
1008 static void mld_gq_start_timer(struct inet6_dev *idev)
1009 {
1010 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1011
1012 idev->mc_gq_running = 1;
1013 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1014 in6_dev_hold(idev);
1015 }
1016
1017 static void mld_gq_stop_timer(struct inet6_dev *idev)
1018 {
1019 idev->mc_gq_running = 0;
1020 if (del_timer(&idev->mc_gq_timer))
1021 __in6_dev_put(idev);
1022 }
1023
1024 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1025 {
1026 unsigned long tv = prandom_u32() % delay;
1027
1028 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1029 in6_dev_hold(idev);
1030 }
1031
1032 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1033 {
1034 idev->mc_ifc_count = 0;
1035 if (del_timer(&idev->mc_ifc_timer))
1036 __in6_dev_put(idev);
1037 }
1038
1039 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1040 {
1041 unsigned long tv = prandom_u32() % delay;
1042
1043 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1044 in6_dev_hold(idev);
1045 }
1046
1047 static void mld_dad_stop_timer(struct inet6_dev *idev)
1048 {
1049 if (del_timer(&idev->mc_dad_timer))
1050 __in6_dev_put(idev);
1051 }
1052
1053 /*
1054 * IGMP handling (alias multicast ICMPv6 messages)
1055 */
1056
1057 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1058 {
1059 unsigned long delay = resptime;
1060
1061 /* Do not start timer for these addresses */
1062 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1063 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1064 return;
1065
1066 if (del_timer(&ma->mca_timer)) {
1067 atomic_dec(&ma->mca_refcnt);
1068 delay = ma->mca_timer.expires - jiffies;
1069 }
1070
1071 if (delay >= resptime)
1072 delay = prandom_u32() % resptime;
1073
1074 ma->mca_timer.expires = jiffies + delay;
1075 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1076 atomic_inc(&ma->mca_refcnt);
1077 ma->mca_flags |= MAF_TIMER_RUNNING;
1078 }
1079
1080 /* mark EXCLUDE-mode sources */
1081 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1082 const struct in6_addr *srcs)
1083 {
1084 struct ip6_sf_list *psf;
1085 int i, scount;
1086
1087 scount = 0;
1088 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1089 if (scount == nsrcs)
1090 break;
1091 for (i = 0; i < nsrcs; i++) {
1092 /* skip inactive filters */
1093 if (psf->sf_count[MCAST_INCLUDE] ||
1094 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1095 psf->sf_count[MCAST_EXCLUDE])
1096 break;
1097 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1098 scount++;
1099 break;
1100 }
1101 }
1102 }
1103 pmc->mca_flags &= ~MAF_GSQUERY;
1104 if (scount == nsrcs) /* all sources excluded */
1105 return false;
1106 return true;
1107 }
1108
1109 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1110 const struct in6_addr *srcs)
1111 {
1112 struct ip6_sf_list *psf;
1113 int i, scount;
1114
1115 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1116 return mld_xmarksources(pmc, nsrcs, srcs);
1117
1118 /* mark INCLUDE-mode sources */
1119
1120 scount = 0;
1121 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1122 if (scount == nsrcs)
1123 break;
1124 for (i = 0; i < nsrcs; i++) {
1125 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1126 psf->sf_gsresp = 1;
1127 scount++;
1128 break;
1129 }
1130 }
1131 }
1132 if (!scount) {
1133 pmc->mca_flags &= ~MAF_GSQUERY;
1134 return false;
1135 }
1136 pmc->mca_flags |= MAF_GSQUERY;
1137 return true;
1138 }
1139
1140 static int mld_force_mld_version(const struct inet6_dev *idev)
1141 {
1142 /* Normally, both are 0 here. If enforcement to a particular is
1143 * being used, individual device enforcement will have a lower
1144 * precedence over 'all' device (.../conf/all/force_mld_version).
1145 */
1146
1147 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1148 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1149 else
1150 return idev->cnf.force_mld_version;
1151 }
1152
1153 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1154 {
1155 return mld_force_mld_version(idev) == 2;
1156 }
1157
1158 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1159 {
1160 return mld_force_mld_version(idev) == 1;
1161 }
1162
1163 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1164 {
1165 if (mld_in_v2_mode_only(idev))
1166 return false;
1167 if (mld_in_v1_mode_only(idev))
1168 return true;
1169 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1170 return true;
1171
1172 return false;
1173 }
1174
1175 static void mld_set_v1_mode(struct inet6_dev *idev)
1176 {
1177 /* RFC3810, relevant sections:
1178 * - 9.1. Robustness Variable
1179 * - 9.2. Query Interval
1180 * - 9.3. Query Response Interval
1181 * - 9.12. Older Version Querier Present Timeout
1182 */
1183 unsigned long switchback;
1184
1185 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1186
1187 idev->mc_v1_seen = jiffies + switchback;
1188 }
1189
1190 static void mld_update_qrv(struct inet6_dev *idev,
1191 const struct mld2_query *mlh2)
1192 {
1193 /* RFC3810, relevant sections:
1194 * - 5.1.8. QRV (Querier's Robustness Variable)
1195 * - 9.1. Robustness Variable
1196 */
1197
1198 /* The value of the Robustness Variable MUST NOT be zero,
1199 * and SHOULD NOT be one. Catch this here if we ever run
1200 * into such a case in future.
1201 */
1202 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1203 WARN_ON(idev->mc_qrv == 0);
1204
1205 if (mlh2->mld2q_qrv > 0)
1206 idev->mc_qrv = mlh2->mld2q_qrv;
1207
1208 if (unlikely(idev->mc_qrv < min_qrv)) {
1209 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1210 idev->mc_qrv, min_qrv);
1211 idev->mc_qrv = min_qrv;
1212 }
1213 }
1214
1215 static void mld_update_qi(struct inet6_dev *idev,
1216 const struct mld2_query *mlh2)
1217 {
1218 /* RFC3810, relevant sections:
1219 * - 5.1.9. QQIC (Querier's Query Interval Code)
1220 * - 9.2. Query Interval
1221 * - 9.12. Older Version Querier Present Timeout
1222 * (the [Query Interval] in the last Query received)
1223 */
1224 unsigned long mc_qqi;
1225
1226 if (mlh2->mld2q_qqic < 128) {
1227 mc_qqi = mlh2->mld2q_qqic;
1228 } else {
1229 unsigned long mc_man, mc_exp;
1230
1231 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1232 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1233
1234 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1235 }
1236
1237 idev->mc_qi = mc_qqi * HZ;
1238 }
1239
1240 static void mld_update_qri(struct inet6_dev *idev,
1241 const struct mld2_query *mlh2)
1242 {
1243 /* RFC3810, relevant sections:
1244 * - 5.1.3. Maximum Response Code
1245 * - 9.3. Query Response Interval
1246 */
1247 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1248 }
1249
1250 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1251 unsigned long *max_delay, bool v1_query)
1252 {
1253 unsigned long mldv1_md;
1254
1255 /* Ignore v1 queries */
1256 if (mld_in_v2_mode_only(idev))
1257 return -EINVAL;
1258
1259 mldv1_md = ntohs(mld->mld_maxdelay);
1260
1261 /* When in MLDv1 fallback and a MLDv2 router start-up being
1262 * unaware of current MLDv1 operation, the MRC == MRD mapping
1263 * only works when the exponential algorithm is not being
1264 * used (as MLDv1 is unaware of such things).
1265 *
1266 * According to the RFC author, the MLDv2 implementations
1267 * he's aware of all use a MRC < 32768 on start up queries.
1268 *
1269 * Thus, should we *ever* encounter something else larger
1270 * than that, just assume the maximum possible within our
1271 * reach.
1272 */
1273 if (!v1_query)
1274 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1275
1276 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1277
1278 /* MLDv1 router present: we need to go into v1 mode *only*
1279 * when an MLDv1 query is received as per section 9.12. of
1280 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1281 * queries MUST be of exactly 24 octets.
1282 */
1283 if (v1_query)
1284 mld_set_v1_mode(idev);
1285
1286 /* cancel MLDv2 report timer */
1287 mld_gq_stop_timer(idev);
1288 /* cancel the interface change timer */
1289 mld_ifc_stop_timer(idev);
1290 /* clear deleted report items */
1291 mld_clear_delrec(idev);
1292
1293 return 0;
1294 }
1295
1296 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1297 unsigned long *max_delay)
1298 {
1299 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1300
1301 mld_update_qrv(idev, mld);
1302 mld_update_qi(idev, mld);
1303 mld_update_qri(idev, mld);
1304
1305 idev->mc_maxdelay = *max_delay;
1306
1307 return 0;
1308 }
1309
1310 /* called with rcu_read_lock() */
1311 int igmp6_event_query(struct sk_buff *skb)
1312 {
1313 struct mld2_query *mlh2 = NULL;
1314 struct ifmcaddr6 *ma;
1315 const struct in6_addr *group;
1316 unsigned long max_delay;
1317 struct inet6_dev *idev;
1318 struct mld_msg *mld;
1319 int group_type;
1320 int mark = 0;
1321 int len, err;
1322
1323 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1324 return -EINVAL;
1325
1326 /* compute payload length excluding extension headers */
1327 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1328 len -= skb_network_header_len(skb);
1329
1330 /* RFC3810 6.2
1331 * Upon reception of an MLD message that contains a Query, the node
1332 * checks if the source address of the message is a valid link-local
1333 * address, if the Hop Limit is set to 1, and if the Router Alert
1334 * option is present in the Hop-By-Hop Options header of the IPv6
1335 * packet. If any of these checks fails, the packet is dropped.
1336 */
1337 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1338 ipv6_hdr(skb)->hop_limit != 1 ||
1339 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1340 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1341 return -EINVAL;
1342
1343 idev = __in6_dev_get(skb->dev);
1344 if (!idev)
1345 return 0;
1346
1347 mld = (struct mld_msg *)icmp6_hdr(skb);
1348 group = &mld->mld_mca;
1349 group_type = ipv6_addr_type(group);
1350
1351 if (group_type != IPV6_ADDR_ANY &&
1352 !(group_type&IPV6_ADDR_MULTICAST))
1353 return -EINVAL;
1354
1355 if (len < MLD_V1_QUERY_LEN) {
1356 return -EINVAL;
1357 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1358 err = mld_process_v1(idev, mld, &max_delay,
1359 len == MLD_V1_QUERY_LEN);
1360 if (err < 0)
1361 return err;
1362 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1363 int srcs_offset = sizeof(struct mld2_query) -
1364 sizeof(struct icmp6hdr);
1365
1366 if (!pskb_may_pull(skb, srcs_offset))
1367 return -EINVAL;
1368
1369 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1370
1371 err = mld_process_v2(idev, mlh2, &max_delay);
1372 if (err < 0)
1373 return err;
1374
1375 if (group_type == IPV6_ADDR_ANY) { /* general query */
1376 if (mlh2->mld2q_nsrcs)
1377 return -EINVAL; /* no sources allowed */
1378
1379 mld_gq_start_timer(idev);
1380 return 0;
1381 }
1382 /* mark sources to include, if group & source-specific */
1383 if (mlh2->mld2q_nsrcs != 0) {
1384 if (!pskb_may_pull(skb, srcs_offset +
1385 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1386 return -EINVAL;
1387
1388 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1389 mark = 1;
1390 }
1391 } else {
1392 return -EINVAL;
1393 }
1394
1395 read_lock_bh(&idev->lock);
1396 if (group_type == IPV6_ADDR_ANY) {
1397 for (ma = idev->mc_list; ma; ma = ma->next) {
1398 spin_lock_bh(&ma->mca_lock);
1399 igmp6_group_queried(ma, max_delay);
1400 spin_unlock_bh(&ma->mca_lock);
1401 }
1402 } else {
1403 for (ma = idev->mc_list; ma; ma = ma->next) {
1404 if (!ipv6_addr_equal(group, &ma->mca_addr))
1405 continue;
1406 spin_lock_bh(&ma->mca_lock);
1407 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1408 /* gsquery <- gsquery && mark */
1409 if (!mark)
1410 ma->mca_flags &= ~MAF_GSQUERY;
1411 } else {
1412 /* gsquery <- mark */
1413 if (mark)
1414 ma->mca_flags |= MAF_GSQUERY;
1415 else
1416 ma->mca_flags &= ~MAF_GSQUERY;
1417 }
1418 if (!(ma->mca_flags & MAF_GSQUERY) ||
1419 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1420 igmp6_group_queried(ma, max_delay);
1421 spin_unlock_bh(&ma->mca_lock);
1422 break;
1423 }
1424 }
1425 read_unlock_bh(&idev->lock);
1426
1427 return 0;
1428 }
1429
1430 /* called with rcu_read_lock() */
1431 int igmp6_event_report(struct sk_buff *skb)
1432 {
1433 struct ifmcaddr6 *ma;
1434 struct inet6_dev *idev;
1435 struct mld_msg *mld;
1436 int addr_type;
1437
1438 /* Our own report looped back. Ignore it. */
1439 if (skb->pkt_type == PACKET_LOOPBACK)
1440 return 0;
1441
1442 /* send our report if the MC router may not have heard this report */
1443 if (skb->pkt_type != PACKET_MULTICAST &&
1444 skb->pkt_type != PACKET_BROADCAST)
1445 return 0;
1446
1447 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1448 return -EINVAL;
1449
1450 mld = (struct mld_msg *)icmp6_hdr(skb);
1451
1452 /* Drop reports with not link local source */
1453 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1454 if (addr_type != IPV6_ADDR_ANY &&
1455 !(addr_type&IPV6_ADDR_LINKLOCAL))
1456 return -EINVAL;
1457
1458 idev = __in6_dev_get(skb->dev);
1459 if (!idev)
1460 return -ENODEV;
1461
1462 /*
1463 * Cancel the timer for this group
1464 */
1465
1466 read_lock_bh(&idev->lock);
1467 for (ma = idev->mc_list; ma; ma = ma->next) {
1468 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1469 spin_lock(&ma->mca_lock);
1470 if (del_timer(&ma->mca_timer))
1471 atomic_dec(&ma->mca_refcnt);
1472 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1473 spin_unlock(&ma->mca_lock);
1474 break;
1475 }
1476 }
1477 read_unlock_bh(&idev->lock);
1478 return 0;
1479 }
1480
1481 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1482 int gdeleted, int sdeleted)
1483 {
1484 switch (type) {
1485 case MLD2_MODE_IS_INCLUDE:
1486 case MLD2_MODE_IS_EXCLUDE:
1487 if (gdeleted || sdeleted)
1488 return false;
1489 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1490 if (pmc->mca_sfmode == MCAST_INCLUDE)
1491 return true;
1492 /* don't include if this source is excluded
1493 * in all filters
1494 */
1495 if (psf->sf_count[MCAST_INCLUDE])
1496 return type == MLD2_MODE_IS_INCLUDE;
1497 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1498 psf->sf_count[MCAST_EXCLUDE];
1499 }
1500 return false;
1501 case MLD2_CHANGE_TO_INCLUDE:
1502 if (gdeleted || sdeleted)
1503 return false;
1504 return psf->sf_count[MCAST_INCLUDE] != 0;
1505 case MLD2_CHANGE_TO_EXCLUDE:
1506 if (gdeleted || sdeleted)
1507 return false;
1508 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1509 psf->sf_count[MCAST_INCLUDE])
1510 return false;
1511 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1512 psf->sf_count[MCAST_EXCLUDE];
1513 case MLD2_ALLOW_NEW_SOURCES:
1514 if (gdeleted || !psf->sf_crcount)
1515 return false;
1516 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1517 case MLD2_BLOCK_OLD_SOURCES:
1518 if (pmc->mca_sfmode == MCAST_INCLUDE)
1519 return gdeleted || (psf->sf_crcount && sdeleted);
1520 return psf->sf_crcount && !gdeleted && !sdeleted;
1521 }
1522 return false;
1523 }
1524
1525 static int
1526 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1527 {
1528 struct ip6_sf_list *psf;
1529 int scount = 0;
1530
1531 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1532 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1533 continue;
1534 scount++;
1535 }
1536 return scount;
1537 }
1538
1539 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1540 struct net_device *dev,
1541 const struct in6_addr *saddr,
1542 const struct in6_addr *daddr,
1543 int proto, int len)
1544 {
1545 struct ipv6hdr *hdr;
1546
1547 skb->protocol = htons(ETH_P_IPV6);
1548 skb->dev = dev;
1549
1550 skb_reset_network_header(skb);
1551 skb_put(skb, sizeof(struct ipv6hdr));
1552 hdr = ipv6_hdr(skb);
1553
1554 ip6_flow_hdr(hdr, 0, 0);
1555
1556 hdr->payload_len = htons(len);
1557 hdr->nexthdr = proto;
1558 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1559
1560 hdr->saddr = *saddr;
1561 hdr->daddr = *daddr;
1562 }
1563
1564 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1565 {
1566 struct net_device *dev = idev->dev;
1567 struct net *net = dev_net(dev);
1568 struct sock *sk = net->ipv6.igmp_sk;
1569 struct sk_buff *skb;
1570 struct mld2_report *pmr;
1571 struct in6_addr addr_buf;
1572 const struct in6_addr *saddr;
1573 int hlen = LL_RESERVED_SPACE(dev);
1574 int tlen = dev->needed_tailroom;
1575 unsigned int size = mtu + hlen + tlen;
1576 int err;
1577 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1578 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1579 IPV6_TLV_PADN, 0 };
1580
1581 /* we assume size > sizeof(ra) here */
1582 /* limit our allocations to order-0 page */
1583 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1584 skb = sock_alloc_send_skb(sk, size, 1, &err);
1585
1586 if (!skb)
1587 return NULL;
1588
1589 skb->priority = TC_PRIO_CONTROL;
1590 skb_reserve(skb, hlen);
1591 skb_tailroom_reserve(skb, mtu, tlen);
1592
1593 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1594 /* <draft-ietf-magma-mld-source-05.txt>:
1595 * use unspecified address as the source address
1596 * when a valid link-local address is not available.
1597 */
1598 saddr = &in6addr_any;
1599 } else
1600 saddr = &addr_buf;
1601
1602 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1603
1604 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1605
1606 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1607 skb_put(skb, sizeof(*pmr));
1608 pmr = (struct mld2_report *)skb_transport_header(skb);
1609 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1610 pmr->mld2r_resv1 = 0;
1611 pmr->mld2r_cksum = 0;
1612 pmr->mld2r_resv2 = 0;
1613 pmr->mld2r_ngrec = 0;
1614 return skb;
1615 }
1616
1617 static void mld_sendpack(struct sk_buff *skb)
1618 {
1619 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1620 struct mld2_report *pmr =
1621 (struct mld2_report *)skb_transport_header(skb);
1622 int payload_len, mldlen;
1623 struct inet6_dev *idev;
1624 struct net *net = dev_net(skb->dev);
1625 int err;
1626 struct flowi6 fl6;
1627 struct dst_entry *dst;
1628
1629 rcu_read_lock();
1630 idev = __in6_dev_get(skb->dev);
1631 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1632
1633 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1634 sizeof(*pip6);
1635 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1636 pip6->payload_len = htons(payload_len);
1637
1638 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1639 IPPROTO_ICMPV6,
1640 csum_partial(skb_transport_header(skb),
1641 mldlen, 0));
1642
1643 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1644 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1645 skb->dev->ifindex);
1646 dst = icmp6_dst_alloc(skb->dev, &fl6);
1647
1648 err = 0;
1649 if (IS_ERR(dst)) {
1650 err = PTR_ERR(dst);
1651 dst = NULL;
1652 }
1653 skb_dst_set(skb, dst);
1654 if (err)
1655 goto err_out;
1656
1657 payload_len = skb->len;
1658
1659 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1660 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1661 dst_output);
1662 out:
1663 if (!err) {
1664 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1665 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1666 } else {
1667 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1668 }
1669
1670 rcu_read_unlock();
1671 return;
1672
1673 err_out:
1674 kfree_skb(skb);
1675 goto out;
1676 }
1677
1678 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1679 {
1680 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1681 }
1682
1683 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1684 int type, struct mld2_grec **ppgr)
1685 {
1686 struct net_device *dev = pmc->idev->dev;
1687 struct mld2_report *pmr;
1688 struct mld2_grec *pgr;
1689
1690 if (!skb)
1691 skb = mld_newpack(pmc->idev, dev->mtu);
1692 if (!skb)
1693 return NULL;
1694 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1695 pgr->grec_type = type;
1696 pgr->grec_auxwords = 0;
1697 pgr->grec_nsrcs = 0;
1698 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1699 pmr = (struct mld2_report *)skb_transport_header(skb);
1700 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1701 *ppgr = pgr;
1702 return skb;
1703 }
1704
1705 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1706
1707 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1708 int type, int gdeleted, int sdeleted, int crsend)
1709 {
1710 struct inet6_dev *idev = pmc->idev;
1711 struct net_device *dev = idev->dev;
1712 struct mld2_report *pmr;
1713 struct mld2_grec *pgr = NULL;
1714 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1715 int scount, stotal, first, isquery, truncate;
1716
1717 if (pmc->mca_flags & MAF_NOREPORT)
1718 return skb;
1719
1720 isquery = type == MLD2_MODE_IS_INCLUDE ||
1721 type == MLD2_MODE_IS_EXCLUDE;
1722 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1723 type == MLD2_CHANGE_TO_EXCLUDE;
1724
1725 stotal = scount = 0;
1726
1727 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1728
1729 if (!*psf_list)
1730 goto empty_source;
1731
1732 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1733
1734 /* EX and TO_EX get a fresh packet, if needed */
1735 if (truncate) {
1736 if (pmr && pmr->mld2r_ngrec &&
1737 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1738 if (skb)
1739 mld_sendpack(skb);
1740 skb = mld_newpack(idev, dev->mtu);
1741 }
1742 }
1743 first = 1;
1744 psf_prev = NULL;
1745 for (psf = *psf_list; psf; psf = psf_next) {
1746 struct in6_addr *psrc;
1747
1748 psf_next = psf->sf_next;
1749
1750 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1751 psf_prev = psf;
1752 continue;
1753 }
1754
1755 /* Based on RFC3810 6.1. Should not send source-list change
1756 * records when there is a filter mode change.
1757 */
1758 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1759 (!gdeleted && pmc->mca_crcount)) &&
1760 (type == MLD2_ALLOW_NEW_SOURCES ||
1761 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1762 goto decrease_sf_crcount;
1763
1764 /* clear marks on query responses */
1765 if (isquery)
1766 psf->sf_gsresp = 0;
1767
1768 if (AVAILABLE(skb) < sizeof(*psrc) +
1769 first*sizeof(struct mld2_grec)) {
1770 if (truncate && !first)
1771 break; /* truncate these */
1772 if (pgr)
1773 pgr->grec_nsrcs = htons(scount);
1774 if (skb)
1775 mld_sendpack(skb);
1776 skb = mld_newpack(idev, dev->mtu);
1777 first = 1;
1778 scount = 0;
1779 }
1780 if (first) {
1781 skb = add_grhead(skb, pmc, type, &pgr);
1782 first = 0;
1783 }
1784 if (!skb)
1785 return NULL;
1786 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1787 *psrc = psf->sf_addr;
1788 scount++; stotal++;
1789 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1790 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1791 decrease_sf_crcount:
1792 psf->sf_crcount--;
1793 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1794 if (psf_prev)
1795 psf_prev->sf_next = psf->sf_next;
1796 else
1797 *psf_list = psf->sf_next;
1798 kfree(psf);
1799 continue;
1800 }
1801 }
1802 psf_prev = psf;
1803 }
1804
1805 empty_source:
1806 if (!stotal) {
1807 if (type == MLD2_ALLOW_NEW_SOURCES ||
1808 type == MLD2_BLOCK_OLD_SOURCES)
1809 return skb;
1810 if (pmc->mca_crcount || isquery || crsend) {
1811 /* make sure we have room for group header */
1812 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1813 mld_sendpack(skb);
1814 skb = NULL; /* add_grhead will get a new one */
1815 }
1816 skb = add_grhead(skb, pmc, type, &pgr);
1817 }
1818 }
1819 if (pgr)
1820 pgr->grec_nsrcs = htons(scount);
1821
1822 if (isquery)
1823 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1824 return skb;
1825 }
1826
1827 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1828 {
1829 struct sk_buff *skb = NULL;
1830 int type;
1831
1832 read_lock_bh(&idev->lock);
1833 if (!pmc) {
1834 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1835 if (pmc->mca_flags & MAF_NOREPORT)
1836 continue;
1837 spin_lock_bh(&pmc->mca_lock);
1838 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1839 type = MLD2_MODE_IS_EXCLUDE;
1840 else
1841 type = MLD2_MODE_IS_INCLUDE;
1842 skb = add_grec(skb, pmc, type, 0, 0, 0);
1843 spin_unlock_bh(&pmc->mca_lock);
1844 }
1845 } else {
1846 spin_lock_bh(&pmc->mca_lock);
1847 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1848 type = MLD2_MODE_IS_EXCLUDE;
1849 else
1850 type = MLD2_MODE_IS_INCLUDE;
1851 skb = add_grec(skb, pmc, type, 0, 0, 0);
1852 spin_unlock_bh(&pmc->mca_lock);
1853 }
1854 read_unlock_bh(&idev->lock);
1855 if (skb)
1856 mld_sendpack(skb);
1857 }
1858
1859 /*
1860 * remove zero-count source records from a source filter list
1861 */
1862 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1863 {
1864 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1865
1866 psf_prev = NULL;
1867 for (psf = *ppsf; psf; psf = psf_next) {
1868 psf_next = psf->sf_next;
1869 if (psf->sf_crcount == 0) {
1870 if (psf_prev)
1871 psf_prev->sf_next = psf->sf_next;
1872 else
1873 *ppsf = psf->sf_next;
1874 kfree(psf);
1875 } else
1876 psf_prev = psf;
1877 }
1878 }
1879
1880 static void mld_send_cr(struct inet6_dev *idev)
1881 {
1882 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1883 struct sk_buff *skb = NULL;
1884 int type, dtype;
1885
1886 read_lock_bh(&idev->lock);
1887 spin_lock(&idev->mc_lock);
1888
1889 /* deleted MCA's */
1890 pmc_prev = NULL;
1891 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1892 pmc_next = pmc->next;
1893 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1894 type = MLD2_BLOCK_OLD_SOURCES;
1895 dtype = MLD2_BLOCK_OLD_SOURCES;
1896 skb = add_grec(skb, pmc, type, 1, 0, 0);
1897 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1898 }
1899 if (pmc->mca_crcount) {
1900 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1901 type = MLD2_CHANGE_TO_INCLUDE;
1902 skb = add_grec(skb, pmc, type, 1, 0, 0);
1903 }
1904 pmc->mca_crcount--;
1905 if (pmc->mca_crcount == 0) {
1906 mld_clear_zeros(&pmc->mca_tomb);
1907 mld_clear_zeros(&pmc->mca_sources);
1908 }
1909 }
1910 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1911 !pmc->mca_sources) {
1912 if (pmc_prev)
1913 pmc_prev->next = pmc_next;
1914 else
1915 idev->mc_tomb = pmc_next;
1916 in6_dev_put(pmc->idev);
1917 kfree(pmc);
1918 } else
1919 pmc_prev = pmc;
1920 }
1921 spin_unlock(&idev->mc_lock);
1922
1923 /* change recs */
1924 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1925 spin_lock_bh(&pmc->mca_lock);
1926 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1927 type = MLD2_BLOCK_OLD_SOURCES;
1928 dtype = MLD2_ALLOW_NEW_SOURCES;
1929 } else {
1930 type = MLD2_ALLOW_NEW_SOURCES;
1931 dtype = MLD2_BLOCK_OLD_SOURCES;
1932 }
1933 skb = add_grec(skb, pmc, type, 0, 0, 0);
1934 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1935
1936 /* filter mode changes */
1937 if (pmc->mca_crcount) {
1938 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1939 type = MLD2_CHANGE_TO_EXCLUDE;
1940 else
1941 type = MLD2_CHANGE_TO_INCLUDE;
1942 skb = add_grec(skb, pmc, type, 0, 0, 0);
1943 pmc->mca_crcount--;
1944 }
1945 spin_unlock_bh(&pmc->mca_lock);
1946 }
1947 read_unlock_bh(&idev->lock);
1948 if (!skb)
1949 return;
1950 (void) mld_sendpack(skb);
1951 }
1952
1953 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1954 {
1955 struct net *net = dev_net(dev);
1956 struct sock *sk = net->ipv6.igmp_sk;
1957 struct inet6_dev *idev;
1958 struct sk_buff *skb;
1959 struct mld_msg *hdr;
1960 const struct in6_addr *snd_addr, *saddr;
1961 struct in6_addr addr_buf;
1962 int hlen = LL_RESERVED_SPACE(dev);
1963 int tlen = dev->needed_tailroom;
1964 int err, len, payload_len, full_len;
1965 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1966 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1967 IPV6_TLV_PADN, 0 };
1968 struct flowi6 fl6;
1969 struct dst_entry *dst;
1970
1971 if (type == ICMPV6_MGM_REDUCTION)
1972 snd_addr = &in6addr_linklocal_allrouters;
1973 else
1974 snd_addr = addr;
1975
1976 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1977 payload_len = len + sizeof(ra);
1978 full_len = sizeof(struct ipv6hdr) + payload_len;
1979
1980 rcu_read_lock();
1981 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1982 IPSTATS_MIB_OUT, full_len);
1983 rcu_read_unlock();
1984
1985 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1986
1987 if (!skb) {
1988 rcu_read_lock();
1989 IP6_INC_STATS(net, __in6_dev_get(dev),
1990 IPSTATS_MIB_OUTDISCARDS);
1991 rcu_read_unlock();
1992 return;
1993 }
1994 skb->priority = TC_PRIO_CONTROL;
1995 skb_reserve(skb, hlen);
1996
1997 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1998 /* <draft-ietf-magma-mld-source-05.txt>:
1999 * use unspecified address as the source address
2000 * when a valid link-local address is not available.
2001 */
2002 saddr = &in6addr_any;
2003 } else
2004 saddr = &addr_buf;
2005
2006 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2007
2008 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
2009
2010 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
2011 memset(hdr, 0, sizeof(struct mld_msg));
2012 hdr->mld_type = type;
2013 hdr->mld_mca = *addr;
2014
2015 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2016 IPPROTO_ICMPV6,
2017 csum_partial(hdr, len, 0));
2018
2019 rcu_read_lock();
2020 idev = __in6_dev_get(skb->dev);
2021
2022 icmpv6_flow_init(sk, &fl6, type,
2023 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2024 skb->dev->ifindex);
2025 dst = icmp6_dst_alloc(skb->dev, &fl6);
2026 if (IS_ERR(dst)) {
2027 err = PTR_ERR(dst);
2028 goto err_out;
2029 }
2030
2031 skb_dst_set(skb, dst);
2032 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2033 net, sk, skb, NULL, skb->dev,
2034 dst_output);
2035 out:
2036 if (!err) {
2037 ICMP6MSGOUT_INC_STATS(net, idev, type);
2038 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2039 } else
2040 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2041
2042 rcu_read_unlock();
2043 return;
2044
2045 err_out:
2046 kfree_skb(skb);
2047 goto out;
2048 }
2049
2050 static void mld_send_initial_cr(struct inet6_dev *idev)
2051 {
2052 struct sk_buff *skb;
2053 struct ifmcaddr6 *pmc;
2054 int type;
2055
2056 if (mld_in_v1_mode(idev))
2057 return;
2058
2059 skb = NULL;
2060 read_lock_bh(&idev->lock);
2061 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2062 spin_lock_bh(&pmc->mca_lock);
2063 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2064 type = MLD2_CHANGE_TO_EXCLUDE;
2065 else
2066 type = MLD2_CHANGE_TO_INCLUDE;
2067 skb = add_grec(skb, pmc, type, 0, 0, 1);
2068 spin_unlock_bh(&pmc->mca_lock);
2069 }
2070 read_unlock_bh(&idev->lock);
2071 if (skb)
2072 mld_sendpack(skb);
2073 }
2074
2075 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2076 {
2077 idev->mc_dad_count = idev->mc_qrv;
2078 if (idev->mc_dad_count) {
2079 mld_send_initial_cr(idev);
2080 idev->mc_dad_count--;
2081 if (idev->mc_dad_count)
2082 mld_dad_start_timer(idev, idev->mc_maxdelay);
2083 }
2084 }
2085
2086 static void mld_dad_timer_expire(unsigned long data)
2087 {
2088 struct inet6_dev *idev = (struct inet6_dev *)data;
2089
2090 mld_send_initial_cr(idev);
2091 if (idev->mc_dad_count) {
2092 idev->mc_dad_count--;
2093 if (idev->mc_dad_count)
2094 mld_dad_start_timer(idev, idev->mc_maxdelay);
2095 }
2096 in6_dev_put(idev);
2097 }
2098
2099 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2100 const struct in6_addr *psfsrc)
2101 {
2102 struct ip6_sf_list *psf, *psf_prev;
2103 int rv = 0;
2104
2105 psf_prev = NULL;
2106 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2107 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2108 break;
2109 psf_prev = psf;
2110 }
2111 if (!psf || psf->sf_count[sfmode] == 0) {
2112 /* source filter not found, or count wrong => bug */
2113 return -ESRCH;
2114 }
2115 psf->sf_count[sfmode]--;
2116 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2117 struct inet6_dev *idev = pmc->idev;
2118
2119 /* no more filters for this source */
2120 if (psf_prev)
2121 psf_prev->sf_next = psf->sf_next;
2122 else
2123 pmc->mca_sources = psf->sf_next;
2124 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2125 !mld_in_v1_mode(idev)) {
2126 psf->sf_crcount = idev->mc_qrv;
2127 psf->sf_next = pmc->mca_tomb;
2128 pmc->mca_tomb = psf;
2129 rv = 1;
2130 } else
2131 kfree(psf);
2132 }
2133 return rv;
2134 }
2135
2136 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2137 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2138 int delta)
2139 {
2140 struct ifmcaddr6 *pmc;
2141 int changerec = 0;
2142 int i, err;
2143
2144 if (!idev)
2145 return -ENODEV;
2146 read_lock_bh(&idev->lock);
2147 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2148 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2149 break;
2150 }
2151 if (!pmc) {
2152 /* MCA not found?? bug */
2153 read_unlock_bh(&idev->lock);
2154 return -ESRCH;
2155 }
2156 spin_lock_bh(&pmc->mca_lock);
2157 sf_markstate(pmc);
2158 if (!delta) {
2159 if (!pmc->mca_sfcount[sfmode]) {
2160 spin_unlock_bh(&pmc->mca_lock);
2161 read_unlock_bh(&idev->lock);
2162 return -EINVAL;
2163 }
2164 pmc->mca_sfcount[sfmode]--;
2165 }
2166 err = 0;
2167 for (i = 0; i < sfcount; i++) {
2168 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2169
2170 changerec |= rv > 0;
2171 if (!err && rv < 0)
2172 err = rv;
2173 }
2174 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2175 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2176 pmc->mca_sfcount[MCAST_INCLUDE]) {
2177 struct ip6_sf_list *psf;
2178
2179 /* filter mode change */
2180 pmc->mca_sfmode = MCAST_INCLUDE;
2181 pmc->mca_crcount = idev->mc_qrv;
2182 idev->mc_ifc_count = pmc->mca_crcount;
2183 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2184 psf->sf_crcount = 0;
2185 mld_ifc_event(pmc->idev);
2186 } else if (sf_setstate(pmc) || changerec)
2187 mld_ifc_event(pmc->idev);
2188 spin_unlock_bh(&pmc->mca_lock);
2189 read_unlock_bh(&idev->lock);
2190 return err;
2191 }
2192
2193 /*
2194 * Add multicast single-source filter to the interface list
2195 */
2196 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2197 const struct in6_addr *psfsrc)
2198 {
2199 struct ip6_sf_list *psf, *psf_prev;
2200
2201 psf_prev = NULL;
2202 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2203 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2204 break;
2205 psf_prev = psf;
2206 }
2207 if (!psf) {
2208 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2209 if (!psf)
2210 return -ENOBUFS;
2211
2212 psf->sf_addr = *psfsrc;
2213 if (psf_prev) {
2214 psf_prev->sf_next = psf;
2215 } else
2216 pmc->mca_sources = psf;
2217 }
2218 psf->sf_count[sfmode]++;
2219 return 0;
2220 }
2221
2222 static void sf_markstate(struct ifmcaddr6 *pmc)
2223 {
2224 struct ip6_sf_list *psf;
2225 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2226
2227 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2228 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2229 psf->sf_oldin = mca_xcount ==
2230 psf->sf_count[MCAST_EXCLUDE] &&
2231 !psf->sf_count[MCAST_INCLUDE];
2232 } else
2233 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2234 }
2235
2236 static int sf_setstate(struct ifmcaddr6 *pmc)
2237 {
2238 struct ip6_sf_list *psf, *dpsf;
2239 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2240 int qrv = pmc->idev->mc_qrv;
2241 int new_in, rv;
2242
2243 rv = 0;
2244 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2245 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2246 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2247 !psf->sf_count[MCAST_INCLUDE];
2248 } else
2249 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2250 if (new_in) {
2251 if (!psf->sf_oldin) {
2252 struct ip6_sf_list *prev = NULL;
2253
2254 for (dpsf = pmc->mca_tomb; dpsf;
2255 dpsf = dpsf->sf_next) {
2256 if (ipv6_addr_equal(&dpsf->sf_addr,
2257 &psf->sf_addr))
2258 break;
2259 prev = dpsf;
2260 }
2261 if (dpsf) {
2262 if (prev)
2263 prev->sf_next = dpsf->sf_next;
2264 else
2265 pmc->mca_tomb = dpsf->sf_next;
2266 kfree(dpsf);
2267 }
2268 psf->sf_crcount = qrv;
2269 rv++;
2270 }
2271 } else if (psf->sf_oldin) {
2272 psf->sf_crcount = 0;
2273 /*
2274 * add or update "delete" records if an active filter
2275 * is now inactive
2276 */
2277 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2278 if (ipv6_addr_equal(&dpsf->sf_addr,
2279 &psf->sf_addr))
2280 break;
2281 if (!dpsf) {
2282 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2283 if (!dpsf)
2284 continue;
2285 *dpsf = *psf;
2286 /* pmc->mca_lock held by callers */
2287 dpsf->sf_next = pmc->mca_tomb;
2288 pmc->mca_tomb = dpsf;
2289 }
2290 dpsf->sf_crcount = qrv;
2291 rv++;
2292 }
2293 }
2294 return rv;
2295 }
2296
2297 /*
2298 * Add multicast source filter list to the interface list
2299 */
2300 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2301 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2302 int delta)
2303 {
2304 struct ifmcaddr6 *pmc;
2305 int isexclude;
2306 int i, err;
2307
2308 if (!idev)
2309 return -ENODEV;
2310 read_lock_bh(&idev->lock);
2311 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2312 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2313 break;
2314 }
2315 if (!pmc) {
2316 /* MCA not found?? bug */
2317 read_unlock_bh(&idev->lock);
2318 return -ESRCH;
2319 }
2320 spin_lock_bh(&pmc->mca_lock);
2321
2322 sf_markstate(pmc);
2323 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2324 if (!delta)
2325 pmc->mca_sfcount[sfmode]++;
2326 err = 0;
2327 for (i = 0; i < sfcount; i++) {
2328 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2329 if (err)
2330 break;
2331 }
2332 if (err) {
2333 int j;
2334
2335 if (!delta)
2336 pmc->mca_sfcount[sfmode]--;
2337 for (j = 0; j < i; j++)
2338 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2339 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2340 struct ip6_sf_list *psf;
2341
2342 /* filter mode change */
2343 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2344 pmc->mca_sfmode = MCAST_EXCLUDE;
2345 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2346 pmc->mca_sfmode = MCAST_INCLUDE;
2347 /* else no filters; keep old mode for reports */
2348
2349 pmc->mca_crcount = idev->mc_qrv;
2350 idev->mc_ifc_count = pmc->mca_crcount;
2351 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2352 psf->sf_crcount = 0;
2353 mld_ifc_event(idev);
2354 } else if (sf_setstate(pmc))
2355 mld_ifc_event(idev);
2356 spin_unlock_bh(&pmc->mca_lock);
2357 read_unlock_bh(&idev->lock);
2358 return err;
2359 }
2360
2361 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2362 {
2363 struct ip6_sf_list *psf, *nextpsf;
2364
2365 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2366 nextpsf = psf->sf_next;
2367 kfree(psf);
2368 }
2369 pmc->mca_tomb = NULL;
2370 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2371 nextpsf = psf->sf_next;
2372 kfree(psf);
2373 }
2374 pmc->mca_sources = NULL;
2375 pmc->mca_sfmode = MCAST_EXCLUDE;
2376 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2377 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2378 }
2379
2380
2381 static void igmp6_join_group(struct ifmcaddr6 *ma)
2382 {
2383 unsigned long delay;
2384
2385 if (ma->mca_flags & MAF_NOREPORT)
2386 return;
2387
2388 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2389
2390 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2391
2392 spin_lock_bh(&ma->mca_lock);
2393 if (del_timer(&ma->mca_timer)) {
2394 atomic_dec(&ma->mca_refcnt);
2395 delay = ma->mca_timer.expires - jiffies;
2396 }
2397
2398 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2399 atomic_inc(&ma->mca_refcnt);
2400 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2401 spin_unlock_bh(&ma->mca_lock);
2402 }
2403
2404 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2405 struct inet6_dev *idev)
2406 {
2407 int err;
2408
2409 /* callers have the socket lock and rtnl lock
2410 * so no other readers or writers of iml or its sflist
2411 */
2412 if (!iml->sflist) {
2413 /* any-source empty exclude case */
2414 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2415 }
2416 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2417 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2418 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2419 iml->sflist = NULL;
2420 return err;
2421 }
2422
2423 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2424 {
2425 if (mld_in_v1_mode(ma->idev)) {
2426 if (ma->mca_flags & MAF_LAST_REPORTER)
2427 igmp6_send(&ma->mca_addr, ma->idev->dev,
2428 ICMPV6_MGM_REDUCTION);
2429 } else {
2430 mld_add_delrec(ma->idev, ma);
2431 mld_ifc_event(ma->idev);
2432 }
2433 }
2434
2435 static void mld_gq_timer_expire(unsigned long data)
2436 {
2437 struct inet6_dev *idev = (struct inet6_dev *)data;
2438
2439 idev->mc_gq_running = 0;
2440 mld_send_report(idev, NULL);
2441 in6_dev_put(idev);
2442 }
2443
2444 static void mld_ifc_timer_expire(unsigned long data)
2445 {
2446 struct inet6_dev *idev = (struct inet6_dev *)data;
2447
2448 mld_send_cr(idev);
2449 if (idev->mc_ifc_count) {
2450 idev->mc_ifc_count--;
2451 if (idev->mc_ifc_count)
2452 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2453 }
2454 in6_dev_put(idev);
2455 }
2456
2457 static void mld_ifc_event(struct inet6_dev *idev)
2458 {
2459 if (mld_in_v1_mode(idev))
2460 return;
2461 idev->mc_ifc_count = idev->mc_qrv;
2462 mld_ifc_start_timer(idev, 1);
2463 }
2464
2465
2466 static void igmp6_timer_handler(unsigned long data)
2467 {
2468 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2469
2470 if (mld_in_v1_mode(ma->idev))
2471 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2472 else
2473 mld_send_report(ma->idev, ma);
2474
2475 spin_lock(&ma->mca_lock);
2476 ma->mca_flags |= MAF_LAST_REPORTER;
2477 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2478 spin_unlock(&ma->mca_lock);
2479 ma_put(ma);
2480 }
2481
2482 /* Device changing type */
2483
2484 void ipv6_mc_unmap(struct inet6_dev *idev)
2485 {
2486 struct ifmcaddr6 *i;
2487
2488 /* Install multicast list, except for all-nodes (already installed) */
2489
2490 read_lock_bh(&idev->lock);
2491 for (i = idev->mc_list; i; i = i->next)
2492 igmp6_group_dropped(i);
2493 read_unlock_bh(&idev->lock);
2494 }
2495
2496 void ipv6_mc_remap(struct inet6_dev *idev)
2497 {
2498 ipv6_mc_up(idev);
2499 }
2500
2501 /* Device going down */
2502
2503 void ipv6_mc_down(struct inet6_dev *idev)
2504 {
2505 struct ifmcaddr6 *i;
2506
2507 /* Withdraw multicast list */
2508
2509 read_lock_bh(&idev->lock);
2510
2511 for (i = idev->mc_list; i; i = i->next)
2512 igmp6_group_dropped(i);
2513
2514 /* Should stop timer after group drop. or we will
2515 * start timer again in mld_ifc_event()
2516 */
2517 mld_ifc_stop_timer(idev);
2518 mld_gq_stop_timer(idev);
2519 mld_dad_stop_timer(idev);
2520 read_unlock_bh(&idev->lock);
2521 }
2522
2523 static void ipv6_mc_reset(struct inet6_dev *idev)
2524 {
2525 idev->mc_qrv = sysctl_mld_qrv;
2526 idev->mc_qi = MLD_QI_DEFAULT;
2527 idev->mc_qri = MLD_QRI_DEFAULT;
2528 idev->mc_v1_seen = 0;
2529 idev->mc_maxdelay = unsolicited_report_interval(idev);
2530 }
2531
2532 /* Device going up */
2533
2534 void ipv6_mc_up(struct inet6_dev *idev)
2535 {
2536 struct ifmcaddr6 *i;
2537
2538 /* Install multicast list, except for all-nodes (already installed) */
2539
2540 read_lock_bh(&idev->lock);
2541 ipv6_mc_reset(idev);
2542 for (i = idev->mc_list; i; i = i->next) {
2543 mld_del_delrec(idev, i);
2544 igmp6_group_added(i);
2545 }
2546 read_unlock_bh(&idev->lock);
2547 }
2548
2549 /* IPv6 device initialization. */
2550
2551 void ipv6_mc_init_dev(struct inet6_dev *idev)
2552 {
2553 write_lock_bh(&idev->lock);
2554 spin_lock_init(&idev->mc_lock);
2555 idev->mc_gq_running = 0;
2556 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2557 (unsigned long)idev);
2558 idev->mc_tomb = NULL;
2559 idev->mc_ifc_count = 0;
2560 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2561 (unsigned long)idev);
2562 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2563 (unsigned long)idev);
2564 ipv6_mc_reset(idev);
2565 write_unlock_bh(&idev->lock);
2566 }
2567
2568 /*
2569 * Device is about to be destroyed: clean up.
2570 */
2571
2572 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2573 {
2574 struct ifmcaddr6 *i;
2575
2576 /* Deactivate timers */
2577 ipv6_mc_down(idev);
2578 mld_clear_delrec(idev);
2579
2580 /* Delete all-nodes address. */
2581 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2582 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2583 * fail.
2584 */
2585 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2586
2587 if (idev->cnf.forwarding)
2588 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2589
2590 write_lock_bh(&idev->lock);
2591 while ((i = idev->mc_list) != NULL) {
2592 idev->mc_list = i->next;
2593
2594 write_unlock_bh(&idev->lock);
2595 ma_put(i);
2596 write_lock_bh(&idev->lock);
2597 }
2598 write_unlock_bh(&idev->lock);
2599 }
2600
2601 #ifdef CONFIG_PROC_FS
2602 struct igmp6_mc_iter_state {
2603 struct seq_net_private p;
2604 struct net_device *dev;
2605 struct inet6_dev *idev;
2606 };
2607
2608 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2609
2610 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2611 {
2612 struct ifmcaddr6 *im = NULL;
2613 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2614 struct net *net = seq_file_net(seq);
2615
2616 state->idev = NULL;
2617 for_each_netdev_rcu(net, state->dev) {
2618 struct inet6_dev *idev;
2619 idev = __in6_dev_get(state->dev);
2620 if (!idev)
2621 continue;
2622 read_lock_bh(&idev->lock);
2623 im = idev->mc_list;
2624 if (im) {
2625 state->idev = idev;
2626 break;
2627 }
2628 read_unlock_bh(&idev->lock);
2629 }
2630 return im;
2631 }
2632
2633 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2634 {
2635 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2636
2637 im = im->next;
2638 while (!im) {
2639 if (likely(state->idev))
2640 read_unlock_bh(&state->idev->lock);
2641
2642 state->dev = next_net_device_rcu(state->dev);
2643 if (!state->dev) {
2644 state->idev = NULL;
2645 break;
2646 }
2647 state->idev = __in6_dev_get(state->dev);
2648 if (!state->idev)
2649 continue;
2650 read_lock_bh(&state->idev->lock);
2651 im = state->idev->mc_list;
2652 }
2653 return im;
2654 }
2655
2656 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2657 {
2658 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2659 if (im)
2660 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2661 --pos;
2662 return pos ? NULL : im;
2663 }
2664
2665 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2666 __acquires(RCU)
2667 {
2668 rcu_read_lock();
2669 return igmp6_mc_get_idx(seq, *pos);
2670 }
2671
2672 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2673 {
2674 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2675
2676 ++*pos;
2677 return im;
2678 }
2679
2680 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2681 __releases(RCU)
2682 {
2683 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2684
2685 if (likely(state->idev)) {
2686 read_unlock_bh(&state->idev->lock);
2687 state->idev = NULL;
2688 }
2689 state->dev = NULL;
2690 rcu_read_unlock();
2691 }
2692
2693 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2694 {
2695 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2696 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2697
2698 seq_printf(seq,
2699 "%-4d %-15s %pi6 %5d %08X %ld\n",
2700 state->dev->ifindex, state->dev->name,
2701 &im->mca_addr,
2702 im->mca_users, im->mca_flags,
2703 (im->mca_flags&MAF_TIMER_RUNNING) ?
2704 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2705 return 0;
2706 }
2707
2708 static const struct seq_operations igmp6_mc_seq_ops = {
2709 .start = igmp6_mc_seq_start,
2710 .next = igmp6_mc_seq_next,
2711 .stop = igmp6_mc_seq_stop,
2712 .show = igmp6_mc_seq_show,
2713 };
2714
2715 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2716 {
2717 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2718 sizeof(struct igmp6_mc_iter_state));
2719 }
2720
2721 static const struct file_operations igmp6_mc_seq_fops = {
2722 .owner = THIS_MODULE,
2723 .open = igmp6_mc_seq_open,
2724 .read = seq_read,
2725 .llseek = seq_lseek,
2726 .release = seq_release_net,
2727 };
2728
2729 struct igmp6_mcf_iter_state {
2730 struct seq_net_private p;
2731 struct net_device *dev;
2732 struct inet6_dev *idev;
2733 struct ifmcaddr6 *im;
2734 };
2735
2736 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2737
2738 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2739 {
2740 struct ip6_sf_list *psf = NULL;
2741 struct ifmcaddr6 *im = NULL;
2742 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2743 struct net *net = seq_file_net(seq);
2744
2745 state->idev = NULL;
2746 state->im = NULL;
2747 for_each_netdev_rcu(net, state->dev) {
2748 struct inet6_dev *idev;
2749 idev = __in6_dev_get(state->dev);
2750 if (unlikely(idev == NULL))
2751 continue;
2752 read_lock_bh(&idev->lock);
2753 im = idev->mc_list;
2754 if (likely(im)) {
2755 spin_lock_bh(&im->mca_lock);
2756 psf = im->mca_sources;
2757 if (likely(psf)) {
2758 state->im = im;
2759 state->idev = idev;
2760 break;
2761 }
2762 spin_unlock_bh(&im->mca_lock);
2763 }
2764 read_unlock_bh(&idev->lock);
2765 }
2766 return psf;
2767 }
2768
2769 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2770 {
2771 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2772
2773 psf = psf->sf_next;
2774 while (!psf) {
2775 spin_unlock_bh(&state->im->mca_lock);
2776 state->im = state->im->next;
2777 while (!state->im) {
2778 if (likely(state->idev))
2779 read_unlock_bh(&state->idev->lock);
2780
2781 state->dev = next_net_device_rcu(state->dev);
2782 if (!state->dev) {
2783 state->idev = NULL;
2784 goto out;
2785 }
2786 state->idev = __in6_dev_get(state->dev);
2787 if (!state->idev)
2788 continue;
2789 read_lock_bh(&state->idev->lock);
2790 state->im = state->idev->mc_list;
2791 }
2792 if (!state->im)
2793 break;
2794 spin_lock_bh(&state->im->mca_lock);
2795 psf = state->im->mca_sources;
2796 }
2797 out:
2798 return psf;
2799 }
2800
2801 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2802 {
2803 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2804 if (psf)
2805 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2806 --pos;
2807 return pos ? NULL : psf;
2808 }
2809
2810 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2811 __acquires(RCU)
2812 {
2813 rcu_read_lock();
2814 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2815 }
2816
2817 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2818 {
2819 struct ip6_sf_list *psf;
2820 if (v == SEQ_START_TOKEN)
2821 psf = igmp6_mcf_get_first(seq);
2822 else
2823 psf = igmp6_mcf_get_next(seq, v);
2824 ++*pos;
2825 return psf;
2826 }
2827
2828 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2829 __releases(RCU)
2830 {
2831 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2832 if (likely(state->im)) {
2833 spin_unlock_bh(&state->im->mca_lock);
2834 state->im = NULL;
2835 }
2836 if (likely(state->idev)) {
2837 read_unlock_bh(&state->idev->lock);
2838 state->idev = NULL;
2839 }
2840 state->dev = NULL;
2841 rcu_read_unlock();
2842 }
2843
2844 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2845 {
2846 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2847 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2848
2849 if (v == SEQ_START_TOKEN) {
2850 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2851 } else {
2852 seq_printf(seq,
2853 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2854 state->dev->ifindex, state->dev->name,
2855 &state->im->mca_addr,
2856 &psf->sf_addr,
2857 psf->sf_count[MCAST_INCLUDE],
2858 psf->sf_count[MCAST_EXCLUDE]);
2859 }
2860 return 0;
2861 }
2862
2863 static const struct seq_operations igmp6_mcf_seq_ops = {
2864 .start = igmp6_mcf_seq_start,
2865 .next = igmp6_mcf_seq_next,
2866 .stop = igmp6_mcf_seq_stop,
2867 .show = igmp6_mcf_seq_show,
2868 };
2869
2870 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2871 {
2872 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2873 sizeof(struct igmp6_mcf_iter_state));
2874 }
2875
2876 static const struct file_operations igmp6_mcf_seq_fops = {
2877 .owner = THIS_MODULE,
2878 .open = igmp6_mcf_seq_open,
2879 .read = seq_read,
2880 .llseek = seq_lseek,
2881 .release = seq_release_net,
2882 };
2883
2884 static int __net_init igmp6_proc_init(struct net *net)
2885 {
2886 int err;
2887
2888 err = -ENOMEM;
2889 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2890 goto out;
2891 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2892 &igmp6_mcf_seq_fops))
2893 goto out_proc_net_igmp6;
2894
2895 err = 0;
2896 out:
2897 return err;
2898
2899 out_proc_net_igmp6:
2900 remove_proc_entry("igmp6", net->proc_net);
2901 goto out;
2902 }
2903
2904 static void __net_exit igmp6_proc_exit(struct net *net)
2905 {
2906 remove_proc_entry("mcfilter6", net->proc_net);
2907 remove_proc_entry("igmp6", net->proc_net);
2908 }
2909 #else
2910 static inline int igmp6_proc_init(struct net *net)
2911 {
2912 return 0;
2913 }
2914 static inline void igmp6_proc_exit(struct net *net)
2915 {
2916 }
2917 #endif
2918
2919 static int __net_init igmp6_net_init(struct net *net)
2920 {
2921 int err;
2922
2923 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2924 SOCK_RAW, IPPROTO_ICMPV6, net);
2925 if (err < 0) {
2926 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2927 err);
2928 goto out;
2929 }
2930
2931 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2932
2933 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2934 SOCK_RAW, IPPROTO_ICMPV6, net);
2935 if (err < 0) {
2936 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2937 err);
2938 goto out_sock_create;
2939 }
2940
2941 err = igmp6_proc_init(net);
2942 if (err)
2943 goto out_sock_create_autojoin;
2944
2945 return 0;
2946
2947 out_sock_create_autojoin:
2948 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2949 out_sock_create:
2950 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2951 out:
2952 return err;
2953 }
2954
2955 static void __net_exit igmp6_net_exit(struct net *net)
2956 {
2957 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2958 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2959 igmp6_proc_exit(net);
2960 }
2961
2962 static struct pernet_operations igmp6_net_ops = {
2963 .init = igmp6_net_init,
2964 .exit = igmp6_net_exit,
2965 };
2966
2967 int __init igmp6_init(void)
2968 {
2969 return register_pernet_subsys(&igmp6_net_ops);
2970 }
2971
2972 void igmp6_cleanup(void)
2973 {
2974 unregister_pernet_subsys(&igmp6_net_ops);
2975 }
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