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packets: Always register packet sk in the same order
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 refcount_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 if (im->mca_sfmode == MCAST_INCLUDE) {
775 im->mca_tomb = pmc->mca_tomb;
776 im->mca_sources = pmc->mca_sources;
777 for (psf = im->mca_sources; psf; psf = psf->sf_next)
778 psf->sf_crcount = im->mca_crcount;
779 }
780 in6_dev_put(pmc->idev);
781 kfree(pmc);
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 refcount_inc(&mc->mca_refcnt);
822 }
823
824 static void ma_put(struct ifmcaddr6 *mc)
825 {
826 if (refcount_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 refcount_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 refcount_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 refcount_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 refcount_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 skb_put_data(skb, 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, unsigned int mtu)
1685 {
1686 struct mld2_report *pmr;
1687 struct mld2_grec *pgr;
1688
1689 if (!skb) {
1690 skb = mld_newpack(pmc->idev, mtu);
1691 if (!skb)
1692 return NULL;
1693 }
1694 pgr = 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 unsigned int mtu;
1717
1718 if (pmc->mca_flags & MAF_NOREPORT)
1719 return skb;
1720
1721 mtu = READ_ONCE(dev->mtu);
1722 if (mtu < IPV6_MIN_MTU)
1723 return skb;
1724
1725 isquery = type == MLD2_MODE_IS_INCLUDE ||
1726 type == MLD2_MODE_IS_EXCLUDE;
1727 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1728 type == MLD2_CHANGE_TO_EXCLUDE;
1729
1730 stotal = scount = 0;
1731
1732 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1733
1734 if (!*psf_list)
1735 goto empty_source;
1736
1737 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1738
1739 /* EX and TO_EX get a fresh packet, if needed */
1740 if (truncate) {
1741 if (pmr && pmr->mld2r_ngrec &&
1742 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1743 if (skb)
1744 mld_sendpack(skb);
1745 skb = mld_newpack(idev, mtu);
1746 }
1747 }
1748 first = 1;
1749 psf_prev = NULL;
1750 for (psf = *psf_list; psf; psf = psf_next) {
1751 struct in6_addr *psrc;
1752
1753 psf_next = psf->sf_next;
1754
1755 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1756 psf_prev = psf;
1757 continue;
1758 }
1759
1760 /* Based on RFC3810 6.1. Should not send source-list change
1761 * records when there is a filter mode change.
1762 */
1763 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1764 (!gdeleted && pmc->mca_crcount)) &&
1765 (type == MLD2_ALLOW_NEW_SOURCES ||
1766 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1767 goto decrease_sf_crcount;
1768
1769 /* clear marks on query responses */
1770 if (isquery)
1771 psf->sf_gsresp = 0;
1772
1773 if (AVAILABLE(skb) < sizeof(*psrc) +
1774 first*sizeof(struct mld2_grec)) {
1775 if (truncate && !first)
1776 break; /* truncate these */
1777 if (pgr)
1778 pgr->grec_nsrcs = htons(scount);
1779 if (skb)
1780 mld_sendpack(skb);
1781 skb = mld_newpack(idev, mtu);
1782 first = 1;
1783 scount = 0;
1784 }
1785 if (first) {
1786 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1787 first = 0;
1788 }
1789 if (!skb)
1790 return NULL;
1791 psrc = skb_put(skb, sizeof(*psrc));
1792 *psrc = psf->sf_addr;
1793 scount++; stotal++;
1794 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1795 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1796 decrease_sf_crcount:
1797 psf->sf_crcount--;
1798 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1799 if (psf_prev)
1800 psf_prev->sf_next = psf->sf_next;
1801 else
1802 *psf_list = psf->sf_next;
1803 kfree(psf);
1804 continue;
1805 }
1806 }
1807 psf_prev = psf;
1808 }
1809
1810 empty_source:
1811 if (!stotal) {
1812 if (type == MLD2_ALLOW_NEW_SOURCES ||
1813 type == MLD2_BLOCK_OLD_SOURCES)
1814 return skb;
1815 if (pmc->mca_crcount || isquery || crsend) {
1816 /* make sure we have room for group header */
1817 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1818 mld_sendpack(skb);
1819 skb = NULL; /* add_grhead will get a new one */
1820 }
1821 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1822 }
1823 }
1824 if (pgr)
1825 pgr->grec_nsrcs = htons(scount);
1826
1827 if (isquery)
1828 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1829 return skb;
1830 }
1831
1832 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1833 {
1834 struct sk_buff *skb = NULL;
1835 int type;
1836
1837 read_lock_bh(&idev->lock);
1838 if (!pmc) {
1839 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1840 if (pmc->mca_flags & MAF_NOREPORT)
1841 continue;
1842 spin_lock_bh(&pmc->mca_lock);
1843 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1844 type = MLD2_MODE_IS_EXCLUDE;
1845 else
1846 type = MLD2_MODE_IS_INCLUDE;
1847 skb = add_grec(skb, pmc, type, 0, 0, 0);
1848 spin_unlock_bh(&pmc->mca_lock);
1849 }
1850 } else {
1851 spin_lock_bh(&pmc->mca_lock);
1852 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1853 type = MLD2_MODE_IS_EXCLUDE;
1854 else
1855 type = MLD2_MODE_IS_INCLUDE;
1856 skb = add_grec(skb, pmc, type, 0, 0, 0);
1857 spin_unlock_bh(&pmc->mca_lock);
1858 }
1859 read_unlock_bh(&idev->lock);
1860 if (skb)
1861 mld_sendpack(skb);
1862 }
1863
1864 /*
1865 * remove zero-count source records from a source filter list
1866 */
1867 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1868 {
1869 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1870
1871 psf_prev = NULL;
1872 for (psf = *ppsf; psf; psf = psf_next) {
1873 psf_next = psf->sf_next;
1874 if (psf->sf_crcount == 0) {
1875 if (psf_prev)
1876 psf_prev->sf_next = psf->sf_next;
1877 else
1878 *ppsf = psf->sf_next;
1879 kfree(psf);
1880 } else
1881 psf_prev = psf;
1882 }
1883 }
1884
1885 static void mld_send_cr(struct inet6_dev *idev)
1886 {
1887 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1888 struct sk_buff *skb = NULL;
1889 int type, dtype;
1890
1891 read_lock_bh(&idev->lock);
1892 spin_lock(&idev->mc_lock);
1893
1894 /* deleted MCA's */
1895 pmc_prev = NULL;
1896 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1897 pmc_next = pmc->next;
1898 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1899 type = MLD2_BLOCK_OLD_SOURCES;
1900 dtype = MLD2_BLOCK_OLD_SOURCES;
1901 skb = add_grec(skb, pmc, type, 1, 0, 0);
1902 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1903 }
1904 if (pmc->mca_crcount) {
1905 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1906 type = MLD2_CHANGE_TO_INCLUDE;
1907 skb = add_grec(skb, pmc, type, 1, 0, 0);
1908 }
1909 pmc->mca_crcount--;
1910 if (pmc->mca_crcount == 0) {
1911 mld_clear_zeros(&pmc->mca_tomb);
1912 mld_clear_zeros(&pmc->mca_sources);
1913 }
1914 }
1915 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1916 !pmc->mca_sources) {
1917 if (pmc_prev)
1918 pmc_prev->next = pmc_next;
1919 else
1920 idev->mc_tomb = pmc_next;
1921 in6_dev_put(pmc->idev);
1922 kfree(pmc);
1923 } else
1924 pmc_prev = pmc;
1925 }
1926 spin_unlock(&idev->mc_lock);
1927
1928 /* change recs */
1929 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1930 spin_lock_bh(&pmc->mca_lock);
1931 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1932 type = MLD2_BLOCK_OLD_SOURCES;
1933 dtype = MLD2_ALLOW_NEW_SOURCES;
1934 } else {
1935 type = MLD2_ALLOW_NEW_SOURCES;
1936 dtype = MLD2_BLOCK_OLD_SOURCES;
1937 }
1938 skb = add_grec(skb, pmc, type, 0, 0, 0);
1939 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1940
1941 /* filter mode changes */
1942 if (pmc->mca_crcount) {
1943 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1944 type = MLD2_CHANGE_TO_EXCLUDE;
1945 else
1946 type = MLD2_CHANGE_TO_INCLUDE;
1947 skb = add_grec(skb, pmc, type, 0, 0, 0);
1948 pmc->mca_crcount--;
1949 }
1950 spin_unlock_bh(&pmc->mca_lock);
1951 }
1952 read_unlock_bh(&idev->lock);
1953 if (!skb)
1954 return;
1955 (void) mld_sendpack(skb);
1956 }
1957
1958 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1959 {
1960 struct net *net = dev_net(dev);
1961 struct sock *sk = net->ipv6.igmp_sk;
1962 struct inet6_dev *idev;
1963 struct sk_buff *skb;
1964 struct mld_msg *hdr;
1965 const struct in6_addr *snd_addr, *saddr;
1966 struct in6_addr addr_buf;
1967 int hlen = LL_RESERVED_SPACE(dev);
1968 int tlen = dev->needed_tailroom;
1969 int err, len, payload_len, full_len;
1970 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1971 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1972 IPV6_TLV_PADN, 0 };
1973 struct flowi6 fl6;
1974 struct dst_entry *dst;
1975
1976 if (type == ICMPV6_MGM_REDUCTION)
1977 snd_addr = &in6addr_linklocal_allrouters;
1978 else
1979 snd_addr = addr;
1980
1981 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1982 payload_len = len + sizeof(ra);
1983 full_len = sizeof(struct ipv6hdr) + payload_len;
1984
1985 rcu_read_lock();
1986 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1987 IPSTATS_MIB_OUT, full_len);
1988 rcu_read_unlock();
1989
1990 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1991
1992 if (!skb) {
1993 rcu_read_lock();
1994 IP6_INC_STATS(net, __in6_dev_get(dev),
1995 IPSTATS_MIB_OUTDISCARDS);
1996 rcu_read_unlock();
1997 return;
1998 }
1999 skb->priority = TC_PRIO_CONTROL;
2000 skb_reserve(skb, hlen);
2001
2002 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2003 /* <draft-ietf-magma-mld-source-05.txt>:
2004 * use unspecified address as the source address
2005 * when a valid link-local address is not available.
2006 */
2007 saddr = &in6addr_any;
2008 } else
2009 saddr = &addr_buf;
2010
2011 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2012
2013 skb_put_data(skb, ra, sizeof(ra));
2014
2015 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2016 hdr->mld_type = type;
2017 hdr->mld_mca = *addr;
2018
2019 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2020 IPPROTO_ICMPV6,
2021 csum_partial(hdr, len, 0));
2022
2023 rcu_read_lock();
2024 idev = __in6_dev_get(skb->dev);
2025
2026 icmpv6_flow_init(sk, &fl6, type,
2027 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2028 skb->dev->ifindex);
2029 dst = icmp6_dst_alloc(skb->dev, &fl6);
2030 if (IS_ERR(dst)) {
2031 err = PTR_ERR(dst);
2032 goto err_out;
2033 }
2034
2035 skb_dst_set(skb, dst);
2036 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2037 net, sk, skb, NULL, skb->dev,
2038 dst_output);
2039 out:
2040 if (!err) {
2041 ICMP6MSGOUT_INC_STATS(net, idev, type);
2042 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2043 } else
2044 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2045
2046 rcu_read_unlock();
2047 return;
2048
2049 err_out:
2050 kfree_skb(skb);
2051 goto out;
2052 }
2053
2054 static void mld_send_initial_cr(struct inet6_dev *idev)
2055 {
2056 struct sk_buff *skb;
2057 struct ifmcaddr6 *pmc;
2058 int type;
2059
2060 if (mld_in_v1_mode(idev))
2061 return;
2062
2063 skb = NULL;
2064 read_lock_bh(&idev->lock);
2065 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2066 spin_lock_bh(&pmc->mca_lock);
2067 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2068 type = MLD2_CHANGE_TO_EXCLUDE;
2069 else
2070 type = MLD2_CHANGE_TO_INCLUDE;
2071 skb = add_grec(skb, pmc, type, 0, 0, 1);
2072 spin_unlock_bh(&pmc->mca_lock);
2073 }
2074 read_unlock_bh(&idev->lock);
2075 if (skb)
2076 mld_sendpack(skb);
2077 }
2078
2079 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2080 {
2081 idev->mc_dad_count = idev->mc_qrv;
2082 if (idev->mc_dad_count) {
2083 mld_send_initial_cr(idev);
2084 idev->mc_dad_count--;
2085 if (idev->mc_dad_count)
2086 mld_dad_start_timer(idev,
2087 unsolicited_report_interval(idev));
2088 }
2089 }
2090
2091 static void mld_dad_timer_expire(unsigned long data)
2092 {
2093 struct inet6_dev *idev = (struct inet6_dev *)data;
2094
2095 mld_send_initial_cr(idev);
2096 if (idev->mc_dad_count) {
2097 idev->mc_dad_count--;
2098 if (idev->mc_dad_count)
2099 mld_dad_start_timer(idev,
2100 unsolicited_report_interval(idev));
2101 }
2102 in6_dev_put(idev);
2103 }
2104
2105 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2106 const struct in6_addr *psfsrc)
2107 {
2108 struct ip6_sf_list *psf, *psf_prev;
2109 int rv = 0;
2110
2111 psf_prev = NULL;
2112 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2113 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2114 break;
2115 psf_prev = psf;
2116 }
2117 if (!psf || psf->sf_count[sfmode] == 0) {
2118 /* source filter not found, or count wrong => bug */
2119 return -ESRCH;
2120 }
2121 psf->sf_count[sfmode]--;
2122 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2123 struct inet6_dev *idev = pmc->idev;
2124
2125 /* no more filters for this source */
2126 if (psf_prev)
2127 psf_prev->sf_next = psf->sf_next;
2128 else
2129 pmc->mca_sources = psf->sf_next;
2130 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2131 !mld_in_v1_mode(idev)) {
2132 psf->sf_crcount = idev->mc_qrv;
2133 psf->sf_next = pmc->mca_tomb;
2134 pmc->mca_tomb = psf;
2135 rv = 1;
2136 } else
2137 kfree(psf);
2138 }
2139 return rv;
2140 }
2141
2142 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2143 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2144 int delta)
2145 {
2146 struct ifmcaddr6 *pmc;
2147 int changerec = 0;
2148 int i, err;
2149
2150 if (!idev)
2151 return -ENODEV;
2152 read_lock_bh(&idev->lock);
2153 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2154 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2155 break;
2156 }
2157 if (!pmc) {
2158 /* MCA not found?? bug */
2159 read_unlock_bh(&idev->lock);
2160 return -ESRCH;
2161 }
2162 spin_lock_bh(&pmc->mca_lock);
2163 sf_markstate(pmc);
2164 if (!delta) {
2165 if (!pmc->mca_sfcount[sfmode]) {
2166 spin_unlock_bh(&pmc->mca_lock);
2167 read_unlock_bh(&idev->lock);
2168 return -EINVAL;
2169 }
2170 pmc->mca_sfcount[sfmode]--;
2171 }
2172 err = 0;
2173 for (i = 0; i < sfcount; i++) {
2174 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2175
2176 changerec |= rv > 0;
2177 if (!err && rv < 0)
2178 err = rv;
2179 }
2180 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2181 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2182 pmc->mca_sfcount[MCAST_INCLUDE]) {
2183 struct ip6_sf_list *psf;
2184
2185 /* filter mode change */
2186 pmc->mca_sfmode = MCAST_INCLUDE;
2187 pmc->mca_crcount = idev->mc_qrv;
2188 idev->mc_ifc_count = pmc->mca_crcount;
2189 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2190 psf->sf_crcount = 0;
2191 mld_ifc_event(pmc->idev);
2192 } else if (sf_setstate(pmc) || changerec)
2193 mld_ifc_event(pmc->idev);
2194 spin_unlock_bh(&pmc->mca_lock);
2195 read_unlock_bh(&idev->lock);
2196 return err;
2197 }
2198
2199 /*
2200 * Add multicast single-source filter to the interface list
2201 */
2202 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2203 const struct in6_addr *psfsrc)
2204 {
2205 struct ip6_sf_list *psf, *psf_prev;
2206
2207 psf_prev = NULL;
2208 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2209 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2210 break;
2211 psf_prev = psf;
2212 }
2213 if (!psf) {
2214 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2215 if (!psf)
2216 return -ENOBUFS;
2217
2218 psf->sf_addr = *psfsrc;
2219 if (psf_prev) {
2220 psf_prev->sf_next = psf;
2221 } else
2222 pmc->mca_sources = psf;
2223 }
2224 psf->sf_count[sfmode]++;
2225 return 0;
2226 }
2227
2228 static void sf_markstate(struct ifmcaddr6 *pmc)
2229 {
2230 struct ip6_sf_list *psf;
2231 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2232
2233 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2234 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2235 psf->sf_oldin = mca_xcount ==
2236 psf->sf_count[MCAST_EXCLUDE] &&
2237 !psf->sf_count[MCAST_INCLUDE];
2238 } else
2239 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2240 }
2241
2242 static int sf_setstate(struct ifmcaddr6 *pmc)
2243 {
2244 struct ip6_sf_list *psf, *dpsf;
2245 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2246 int qrv = pmc->idev->mc_qrv;
2247 int new_in, rv;
2248
2249 rv = 0;
2250 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2251 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2252 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2253 !psf->sf_count[MCAST_INCLUDE];
2254 } else
2255 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2256 if (new_in) {
2257 if (!psf->sf_oldin) {
2258 struct ip6_sf_list *prev = NULL;
2259
2260 for (dpsf = pmc->mca_tomb; dpsf;
2261 dpsf = dpsf->sf_next) {
2262 if (ipv6_addr_equal(&dpsf->sf_addr,
2263 &psf->sf_addr))
2264 break;
2265 prev = dpsf;
2266 }
2267 if (dpsf) {
2268 if (prev)
2269 prev->sf_next = dpsf->sf_next;
2270 else
2271 pmc->mca_tomb = dpsf->sf_next;
2272 kfree(dpsf);
2273 }
2274 psf->sf_crcount = qrv;
2275 rv++;
2276 }
2277 } else if (psf->sf_oldin) {
2278 psf->sf_crcount = 0;
2279 /*
2280 * add or update "delete" records if an active filter
2281 * is now inactive
2282 */
2283 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2284 if (ipv6_addr_equal(&dpsf->sf_addr,
2285 &psf->sf_addr))
2286 break;
2287 if (!dpsf) {
2288 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2289 if (!dpsf)
2290 continue;
2291 *dpsf = *psf;
2292 /* pmc->mca_lock held by callers */
2293 dpsf->sf_next = pmc->mca_tomb;
2294 pmc->mca_tomb = dpsf;
2295 }
2296 dpsf->sf_crcount = qrv;
2297 rv++;
2298 }
2299 }
2300 return rv;
2301 }
2302
2303 /*
2304 * Add multicast source filter list to the interface list
2305 */
2306 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2307 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2308 int delta)
2309 {
2310 struct ifmcaddr6 *pmc;
2311 int isexclude;
2312 int i, err;
2313
2314 if (!idev)
2315 return -ENODEV;
2316 read_lock_bh(&idev->lock);
2317 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2318 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2319 break;
2320 }
2321 if (!pmc) {
2322 /* MCA not found?? bug */
2323 read_unlock_bh(&idev->lock);
2324 return -ESRCH;
2325 }
2326 spin_lock_bh(&pmc->mca_lock);
2327
2328 sf_markstate(pmc);
2329 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2330 if (!delta)
2331 pmc->mca_sfcount[sfmode]++;
2332 err = 0;
2333 for (i = 0; i < sfcount; i++) {
2334 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2335 if (err)
2336 break;
2337 }
2338 if (err) {
2339 int j;
2340
2341 if (!delta)
2342 pmc->mca_sfcount[sfmode]--;
2343 for (j = 0; j < i; j++)
2344 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2345 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2346 struct ip6_sf_list *psf;
2347
2348 /* filter mode change */
2349 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2350 pmc->mca_sfmode = MCAST_EXCLUDE;
2351 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2352 pmc->mca_sfmode = MCAST_INCLUDE;
2353 /* else no filters; keep old mode for reports */
2354
2355 pmc->mca_crcount = idev->mc_qrv;
2356 idev->mc_ifc_count = pmc->mca_crcount;
2357 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2358 psf->sf_crcount = 0;
2359 mld_ifc_event(idev);
2360 } else if (sf_setstate(pmc))
2361 mld_ifc_event(idev);
2362 spin_unlock_bh(&pmc->mca_lock);
2363 read_unlock_bh(&idev->lock);
2364 return err;
2365 }
2366
2367 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2368 {
2369 struct ip6_sf_list *psf, *nextpsf;
2370
2371 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2372 nextpsf = psf->sf_next;
2373 kfree(psf);
2374 }
2375 pmc->mca_tomb = NULL;
2376 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2377 nextpsf = psf->sf_next;
2378 kfree(psf);
2379 }
2380 pmc->mca_sources = NULL;
2381 pmc->mca_sfmode = MCAST_EXCLUDE;
2382 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2383 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2384 }
2385
2386
2387 static void igmp6_join_group(struct ifmcaddr6 *ma)
2388 {
2389 unsigned long delay;
2390
2391 if (ma->mca_flags & MAF_NOREPORT)
2392 return;
2393
2394 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2395
2396 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2397
2398 spin_lock_bh(&ma->mca_lock);
2399 if (del_timer(&ma->mca_timer)) {
2400 refcount_dec(&ma->mca_refcnt);
2401 delay = ma->mca_timer.expires - jiffies;
2402 }
2403
2404 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2405 refcount_inc(&ma->mca_refcnt);
2406 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2407 spin_unlock_bh(&ma->mca_lock);
2408 }
2409
2410 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2411 struct inet6_dev *idev)
2412 {
2413 int err;
2414
2415 write_lock_bh(&iml->sflock);
2416 if (!iml->sflist) {
2417 /* any-source empty exclude case */
2418 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2419 } else {
2420 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2421 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2422 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2423 iml->sflist = NULL;
2424 }
2425 write_unlock_bh(&iml->sflock);
2426 return err;
2427 }
2428
2429 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2430 {
2431 if (mld_in_v1_mode(ma->idev)) {
2432 if (ma->mca_flags & MAF_LAST_REPORTER)
2433 igmp6_send(&ma->mca_addr, ma->idev->dev,
2434 ICMPV6_MGM_REDUCTION);
2435 } else {
2436 mld_add_delrec(ma->idev, ma);
2437 mld_ifc_event(ma->idev);
2438 }
2439 }
2440
2441 static void mld_gq_timer_expire(unsigned long data)
2442 {
2443 struct inet6_dev *idev = (struct inet6_dev *)data;
2444
2445 idev->mc_gq_running = 0;
2446 mld_send_report(idev, NULL);
2447 in6_dev_put(idev);
2448 }
2449
2450 static void mld_ifc_timer_expire(unsigned long data)
2451 {
2452 struct inet6_dev *idev = (struct inet6_dev *)data;
2453
2454 mld_send_cr(idev);
2455 if (idev->mc_ifc_count) {
2456 idev->mc_ifc_count--;
2457 if (idev->mc_ifc_count)
2458 mld_ifc_start_timer(idev,
2459 unsolicited_report_interval(idev));
2460 }
2461 in6_dev_put(idev);
2462 }
2463
2464 static void mld_ifc_event(struct inet6_dev *idev)
2465 {
2466 if (mld_in_v1_mode(idev))
2467 return;
2468 idev->mc_ifc_count = idev->mc_qrv;
2469 mld_ifc_start_timer(idev, 1);
2470 }
2471
2472 static void igmp6_timer_handler(unsigned long data)
2473 {
2474 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2475
2476 if (mld_in_v1_mode(ma->idev))
2477 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2478 else
2479 mld_send_report(ma->idev, ma);
2480
2481 spin_lock(&ma->mca_lock);
2482 ma->mca_flags |= MAF_LAST_REPORTER;
2483 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2484 spin_unlock(&ma->mca_lock);
2485 ma_put(ma);
2486 }
2487
2488 /* Device changing type */
2489
2490 void ipv6_mc_unmap(struct inet6_dev *idev)
2491 {
2492 struct ifmcaddr6 *i;
2493
2494 /* Install multicast list, except for all-nodes (already installed) */
2495
2496 read_lock_bh(&idev->lock);
2497 for (i = idev->mc_list; i; i = i->next)
2498 igmp6_group_dropped(i);
2499 read_unlock_bh(&idev->lock);
2500 }
2501
2502 void ipv6_mc_remap(struct inet6_dev *idev)
2503 {
2504 ipv6_mc_up(idev);
2505 }
2506
2507 /* Device going down */
2508
2509 void ipv6_mc_down(struct inet6_dev *idev)
2510 {
2511 struct ifmcaddr6 *i;
2512
2513 /* Withdraw multicast list */
2514
2515 read_lock_bh(&idev->lock);
2516
2517 for (i = idev->mc_list; i; i = i->next)
2518 igmp6_group_dropped(i);
2519
2520 /* Should stop timer after group drop. or we will
2521 * start timer again in mld_ifc_event()
2522 */
2523 mld_ifc_stop_timer(idev);
2524 mld_gq_stop_timer(idev);
2525 mld_dad_stop_timer(idev);
2526 read_unlock_bh(&idev->lock);
2527 }
2528
2529 static void ipv6_mc_reset(struct inet6_dev *idev)
2530 {
2531 idev->mc_qrv = sysctl_mld_qrv;
2532 idev->mc_qi = MLD_QI_DEFAULT;
2533 idev->mc_qri = MLD_QRI_DEFAULT;
2534 idev->mc_v1_seen = 0;
2535 idev->mc_maxdelay = unsolicited_report_interval(idev);
2536 }
2537
2538 /* Device going up */
2539
2540 void ipv6_mc_up(struct inet6_dev *idev)
2541 {
2542 struct ifmcaddr6 *i;
2543
2544 /* Install multicast list, except for all-nodes (already installed) */
2545
2546 read_lock_bh(&idev->lock);
2547 ipv6_mc_reset(idev);
2548 for (i = idev->mc_list; i; i = i->next) {
2549 mld_del_delrec(idev, i);
2550 igmp6_group_added(i);
2551 }
2552 read_unlock_bh(&idev->lock);
2553 }
2554
2555 /* IPv6 device initialization. */
2556
2557 void ipv6_mc_init_dev(struct inet6_dev *idev)
2558 {
2559 write_lock_bh(&idev->lock);
2560 spin_lock_init(&idev->mc_lock);
2561 idev->mc_gq_running = 0;
2562 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2563 (unsigned long)idev);
2564 idev->mc_tomb = NULL;
2565 idev->mc_ifc_count = 0;
2566 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2567 (unsigned long)idev);
2568 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2569 (unsigned long)idev);
2570 ipv6_mc_reset(idev);
2571 write_unlock_bh(&idev->lock);
2572 }
2573
2574 /*
2575 * Device is about to be destroyed: clean up.
2576 */
2577
2578 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2579 {
2580 struct ifmcaddr6 *i;
2581
2582 /* Deactivate timers */
2583 ipv6_mc_down(idev);
2584 mld_clear_delrec(idev);
2585
2586 /* Delete all-nodes address. */
2587 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2588 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2589 * fail.
2590 */
2591 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2592
2593 if (idev->cnf.forwarding)
2594 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2595
2596 write_lock_bh(&idev->lock);
2597 while ((i = idev->mc_list) != NULL) {
2598 idev->mc_list = i->next;
2599
2600 write_unlock_bh(&idev->lock);
2601 ma_put(i);
2602 write_lock_bh(&idev->lock);
2603 }
2604 write_unlock_bh(&idev->lock);
2605 }
2606
2607 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2608 {
2609 struct ifmcaddr6 *pmc;
2610
2611 ASSERT_RTNL();
2612
2613 if (mld_in_v1_mode(idev)) {
2614 read_lock_bh(&idev->lock);
2615 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2616 igmp6_join_group(pmc);
2617 read_unlock_bh(&idev->lock);
2618 } else
2619 mld_send_report(idev, NULL);
2620 }
2621
2622 static int ipv6_mc_netdev_event(struct notifier_block *this,
2623 unsigned long event,
2624 void *ptr)
2625 {
2626 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2627 struct inet6_dev *idev = __in6_dev_get(dev);
2628
2629 switch (event) {
2630 case NETDEV_RESEND_IGMP:
2631 if (idev)
2632 ipv6_mc_rejoin_groups(idev);
2633 break;
2634 default:
2635 break;
2636 }
2637
2638 return NOTIFY_DONE;
2639 }
2640
2641 static struct notifier_block igmp6_netdev_notifier = {
2642 .notifier_call = ipv6_mc_netdev_event,
2643 };
2644
2645 #ifdef CONFIG_PROC_FS
2646 struct igmp6_mc_iter_state {
2647 struct seq_net_private p;
2648 struct net_device *dev;
2649 struct inet6_dev *idev;
2650 };
2651
2652 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2653
2654 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2655 {
2656 struct ifmcaddr6 *im = NULL;
2657 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2658 struct net *net = seq_file_net(seq);
2659
2660 state->idev = NULL;
2661 for_each_netdev_rcu(net, state->dev) {
2662 struct inet6_dev *idev;
2663 idev = __in6_dev_get(state->dev);
2664 if (!idev)
2665 continue;
2666 read_lock_bh(&idev->lock);
2667 im = idev->mc_list;
2668 if (im) {
2669 state->idev = idev;
2670 break;
2671 }
2672 read_unlock_bh(&idev->lock);
2673 }
2674 return im;
2675 }
2676
2677 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2678 {
2679 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2680
2681 im = im->next;
2682 while (!im) {
2683 if (likely(state->idev))
2684 read_unlock_bh(&state->idev->lock);
2685
2686 state->dev = next_net_device_rcu(state->dev);
2687 if (!state->dev) {
2688 state->idev = NULL;
2689 break;
2690 }
2691 state->idev = __in6_dev_get(state->dev);
2692 if (!state->idev)
2693 continue;
2694 read_lock_bh(&state->idev->lock);
2695 im = state->idev->mc_list;
2696 }
2697 return im;
2698 }
2699
2700 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2701 {
2702 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2703 if (im)
2704 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2705 --pos;
2706 return pos ? NULL : im;
2707 }
2708
2709 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2710 __acquires(RCU)
2711 {
2712 rcu_read_lock();
2713 return igmp6_mc_get_idx(seq, *pos);
2714 }
2715
2716 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2717 {
2718 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2719
2720 ++*pos;
2721 return im;
2722 }
2723
2724 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2725 __releases(RCU)
2726 {
2727 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2728
2729 if (likely(state->idev)) {
2730 read_unlock_bh(&state->idev->lock);
2731 state->idev = NULL;
2732 }
2733 state->dev = NULL;
2734 rcu_read_unlock();
2735 }
2736
2737 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2738 {
2739 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2740 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2741
2742 seq_printf(seq,
2743 "%-4d %-15s %pi6 %5d %08X %ld\n",
2744 state->dev->ifindex, state->dev->name,
2745 &im->mca_addr,
2746 im->mca_users, im->mca_flags,
2747 (im->mca_flags&MAF_TIMER_RUNNING) ?
2748 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2749 return 0;
2750 }
2751
2752 static const struct seq_operations igmp6_mc_seq_ops = {
2753 .start = igmp6_mc_seq_start,
2754 .next = igmp6_mc_seq_next,
2755 .stop = igmp6_mc_seq_stop,
2756 .show = igmp6_mc_seq_show,
2757 };
2758
2759 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2760 {
2761 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2762 sizeof(struct igmp6_mc_iter_state));
2763 }
2764
2765 static const struct file_operations igmp6_mc_seq_fops = {
2766 .owner = THIS_MODULE,
2767 .open = igmp6_mc_seq_open,
2768 .read = seq_read,
2769 .llseek = seq_lseek,
2770 .release = seq_release_net,
2771 };
2772
2773 struct igmp6_mcf_iter_state {
2774 struct seq_net_private p;
2775 struct net_device *dev;
2776 struct inet6_dev *idev;
2777 struct ifmcaddr6 *im;
2778 };
2779
2780 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2781
2782 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2783 {
2784 struct ip6_sf_list *psf = NULL;
2785 struct ifmcaddr6 *im = NULL;
2786 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2787 struct net *net = seq_file_net(seq);
2788
2789 state->idev = NULL;
2790 state->im = NULL;
2791 for_each_netdev_rcu(net, state->dev) {
2792 struct inet6_dev *idev;
2793 idev = __in6_dev_get(state->dev);
2794 if (unlikely(idev == NULL))
2795 continue;
2796 read_lock_bh(&idev->lock);
2797 im = idev->mc_list;
2798 if (likely(im)) {
2799 spin_lock_bh(&im->mca_lock);
2800 psf = im->mca_sources;
2801 if (likely(psf)) {
2802 state->im = im;
2803 state->idev = idev;
2804 break;
2805 }
2806 spin_unlock_bh(&im->mca_lock);
2807 }
2808 read_unlock_bh(&idev->lock);
2809 }
2810 return psf;
2811 }
2812
2813 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2814 {
2815 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2816
2817 psf = psf->sf_next;
2818 while (!psf) {
2819 spin_unlock_bh(&state->im->mca_lock);
2820 state->im = state->im->next;
2821 while (!state->im) {
2822 if (likely(state->idev))
2823 read_unlock_bh(&state->idev->lock);
2824
2825 state->dev = next_net_device_rcu(state->dev);
2826 if (!state->dev) {
2827 state->idev = NULL;
2828 goto out;
2829 }
2830 state->idev = __in6_dev_get(state->dev);
2831 if (!state->idev)
2832 continue;
2833 read_lock_bh(&state->idev->lock);
2834 state->im = state->idev->mc_list;
2835 }
2836 if (!state->im)
2837 break;
2838 spin_lock_bh(&state->im->mca_lock);
2839 psf = state->im->mca_sources;
2840 }
2841 out:
2842 return psf;
2843 }
2844
2845 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2846 {
2847 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2848 if (psf)
2849 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2850 --pos;
2851 return pos ? NULL : psf;
2852 }
2853
2854 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2855 __acquires(RCU)
2856 {
2857 rcu_read_lock();
2858 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2859 }
2860
2861 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2862 {
2863 struct ip6_sf_list *psf;
2864 if (v == SEQ_START_TOKEN)
2865 psf = igmp6_mcf_get_first(seq);
2866 else
2867 psf = igmp6_mcf_get_next(seq, v);
2868 ++*pos;
2869 return psf;
2870 }
2871
2872 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2873 __releases(RCU)
2874 {
2875 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2876 if (likely(state->im)) {
2877 spin_unlock_bh(&state->im->mca_lock);
2878 state->im = NULL;
2879 }
2880 if (likely(state->idev)) {
2881 read_unlock_bh(&state->idev->lock);
2882 state->idev = NULL;
2883 }
2884 state->dev = NULL;
2885 rcu_read_unlock();
2886 }
2887
2888 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2889 {
2890 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2891 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2892
2893 if (v == SEQ_START_TOKEN) {
2894 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2895 } else {
2896 seq_printf(seq,
2897 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2898 state->dev->ifindex, state->dev->name,
2899 &state->im->mca_addr,
2900 &psf->sf_addr,
2901 psf->sf_count[MCAST_INCLUDE],
2902 psf->sf_count[MCAST_EXCLUDE]);
2903 }
2904 return 0;
2905 }
2906
2907 static const struct seq_operations igmp6_mcf_seq_ops = {
2908 .start = igmp6_mcf_seq_start,
2909 .next = igmp6_mcf_seq_next,
2910 .stop = igmp6_mcf_seq_stop,
2911 .show = igmp6_mcf_seq_show,
2912 };
2913
2914 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2915 {
2916 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2917 sizeof(struct igmp6_mcf_iter_state));
2918 }
2919
2920 static const struct file_operations igmp6_mcf_seq_fops = {
2921 .owner = THIS_MODULE,
2922 .open = igmp6_mcf_seq_open,
2923 .read = seq_read,
2924 .llseek = seq_lseek,
2925 .release = seq_release_net,
2926 };
2927
2928 static int __net_init igmp6_proc_init(struct net *net)
2929 {
2930 int err;
2931
2932 err = -ENOMEM;
2933 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2934 goto out;
2935 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2936 &igmp6_mcf_seq_fops))
2937 goto out_proc_net_igmp6;
2938
2939 err = 0;
2940 out:
2941 return err;
2942
2943 out_proc_net_igmp6:
2944 remove_proc_entry("igmp6", net->proc_net);
2945 goto out;
2946 }
2947
2948 static void __net_exit igmp6_proc_exit(struct net *net)
2949 {
2950 remove_proc_entry("mcfilter6", net->proc_net);
2951 remove_proc_entry("igmp6", net->proc_net);
2952 }
2953 #else
2954 static inline int igmp6_proc_init(struct net *net)
2955 {
2956 return 0;
2957 }
2958 static inline void igmp6_proc_exit(struct net *net)
2959 {
2960 }
2961 #endif
2962
2963 static int __net_init igmp6_net_init(struct net *net)
2964 {
2965 int err;
2966
2967 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2968 SOCK_RAW, IPPROTO_ICMPV6, net);
2969 if (err < 0) {
2970 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2971 err);
2972 goto out;
2973 }
2974
2975 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2976
2977 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2978 SOCK_RAW, IPPROTO_ICMPV6, net);
2979 if (err < 0) {
2980 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2981 err);
2982 goto out_sock_create;
2983 }
2984
2985 err = igmp6_proc_init(net);
2986 if (err)
2987 goto out_sock_create_autojoin;
2988
2989 return 0;
2990
2991 out_sock_create_autojoin:
2992 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2993 out_sock_create:
2994 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2995 out:
2996 return err;
2997 }
2998
2999 static void __net_exit igmp6_net_exit(struct net *net)
3000 {
3001 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3002 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3003 igmp6_proc_exit(net);
3004 }
3005
3006 static struct pernet_operations igmp6_net_ops = {
3007 .init = igmp6_net_init,
3008 .exit = igmp6_net_exit,
3009 };
3010
3011 int __init igmp6_init(void)
3012 {
3013 return register_pernet_subsys(&igmp6_net_ops);
3014 }
3015
3016 int __init igmp6_late_init(void)
3017 {
3018 return register_netdevice_notifier(&igmp6_netdev_notifier);
3019 }
3020
3021 void igmp6_cleanup(void)
3022 {
3023 unregister_pernet_subsys(&igmp6_net_ops);
3024 }
3025
3026 void igmp6_late_cleanup(void)
3027 {
3028 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3029 }