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Replace <asm/uaccess.h> with <linux/uaccess.h> globally
[linux-2.6/btrfs-unstable.git] / net / ipv6 / mcast.c
blob14a3903f1c82d83d44c39befdfe827833d09b13c
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, const struct in6_addr *addr);
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 if (mc->mca_flags & MAF_NOREPORT)
696 goto done;
697 spin_unlock_bh(&mc->mca_lock);
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 done:
706 ip6_mc_clear_src(mc);
707 spin_unlock_bh(&mc->mca_lock);
708 }
709
710 /*
711 * deleted ifmcaddr6 manipulation
712 */
713 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
714 {
715 struct ifmcaddr6 *pmc;
716
717 /* this is an "ifmcaddr6" for convenience; only the fields below
718 * are actually used. In particular, the refcnt and users are not
719 * used for management of the delete list. Using the same structure
720 * for deleted items allows change reports to use common code with
721 * non-deleted or query-response MCA's.
722 */
723 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
724 if (!pmc)
725 return;
726
727 spin_lock_bh(&im->mca_lock);
728 spin_lock_init(&pmc->mca_lock);
729 pmc->idev = im->idev;
730 in6_dev_hold(idev);
731 pmc->mca_addr = im->mca_addr;
732 pmc->mca_crcount = idev->mc_qrv;
733 pmc->mca_sfmode = im->mca_sfmode;
734 if (pmc->mca_sfmode == MCAST_INCLUDE) {
735 struct ip6_sf_list *psf;
736
737 pmc->mca_tomb = im->mca_tomb;
738 pmc->mca_sources = im->mca_sources;
739 im->mca_tomb = im->mca_sources = NULL;
740 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
741 psf->sf_crcount = pmc->mca_crcount;
742 }
743 spin_unlock_bh(&im->mca_lock);
744
745 spin_lock_bh(&idev->mc_lock);
746 pmc->next = idev->mc_tomb;
747 idev->mc_tomb = pmc;
748 spin_unlock_bh(&idev->mc_lock);
749 }
750
751 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
752 {
753 struct ifmcaddr6 *pmc, *pmc_prev;
754 struct ip6_sf_list *psf, *psf_next;
755
756 spin_lock_bh(&idev->mc_lock);
757 pmc_prev = NULL;
758 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
759 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
760 break;
761 pmc_prev = pmc;
762 }
763 if (pmc) {
764 if (pmc_prev)
765 pmc_prev->next = pmc->next;
766 else
767 idev->mc_tomb = pmc->next;
768 }
769 spin_unlock_bh(&idev->mc_lock);
770
771 if (pmc) {
772 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
773 psf_next = psf->sf_next;
774 kfree(psf);
775 }
776 in6_dev_put(pmc->idev);
777 kfree(pmc);
778 }
779 }
780
781 static void mld_clear_delrec(struct inet6_dev *idev)
782 {
783 struct ifmcaddr6 *pmc, *nextpmc;
784
785 spin_lock_bh(&idev->mc_lock);
786 pmc = idev->mc_tomb;
787 idev->mc_tomb = NULL;
788 spin_unlock_bh(&idev->mc_lock);
789
790 for (; pmc; pmc = nextpmc) {
791 nextpmc = pmc->next;
792 ip6_mc_clear_src(pmc);
793 in6_dev_put(pmc->idev);
794 kfree(pmc);
795 }
796
797 /* clear dead sources, too */
798 read_lock_bh(&idev->lock);
799 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
800 struct ip6_sf_list *psf, *psf_next;
801
802 spin_lock_bh(&pmc->mca_lock);
803 psf = pmc->mca_tomb;
804 pmc->mca_tomb = NULL;
805 spin_unlock_bh(&pmc->mca_lock);
806 for (; psf; psf = psf_next) {
807 psf_next = psf->sf_next;
808 kfree(psf);
809 }
810 }
811 read_unlock_bh(&idev->lock);
812 }
813
814 static void mca_get(struct ifmcaddr6 *mc)
815 {
816 atomic_inc(&mc->mca_refcnt);
817 }
818
819 static void ma_put(struct ifmcaddr6 *mc)
820 {
821 if (atomic_dec_and_test(&mc->mca_refcnt)) {
822 in6_dev_put(mc->idev);
823 kfree(mc);
824 }
825 }
826
827 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
828 const struct in6_addr *addr)
829 {
830 struct ifmcaddr6 *mc;
831
832 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
833 if (!mc)
834 return NULL;
835
836 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
837
838 mc->mca_addr = *addr;
839 mc->idev = idev; /* reference taken by caller */
840 mc->mca_users = 1;
841 /* mca_stamp should be updated upon changes */
842 mc->mca_cstamp = mc->mca_tstamp = jiffies;
843 atomic_set(&mc->mca_refcnt, 1);
844 spin_lock_init(&mc->mca_lock);
845
846 /* initial mode is (EX, empty) */
847 mc->mca_sfmode = MCAST_EXCLUDE;
848 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
849
850 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
851 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
852 mc->mca_flags |= MAF_NOREPORT;
853
854 return mc;
855 }
856
857 /*
858 * device multicast group inc (add if not found)
859 */
860 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
861 {
862 struct ifmcaddr6 *mc;
863 struct inet6_dev *idev;
864
865 ASSERT_RTNL();
866
867 /* we need to take a reference on idev */
868 idev = in6_dev_get(dev);
869
870 if (!idev)
871 return -EINVAL;
872
873 write_lock_bh(&idev->lock);
874 if (idev->dead) {
875 write_unlock_bh(&idev->lock);
876 in6_dev_put(idev);
877 return -ENODEV;
878 }
879
880 for (mc = idev->mc_list; mc; mc = mc->next) {
881 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
882 mc->mca_users++;
883 write_unlock_bh(&idev->lock);
884 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
885 NULL, 0);
886 in6_dev_put(idev);
887 return 0;
888 }
889 }
890
891 mc = mca_alloc(idev, addr);
892 if (!mc) {
893 write_unlock_bh(&idev->lock);
894 in6_dev_put(idev);
895 return -ENOMEM;
896 }
897
898 mc->next = idev->mc_list;
899 idev->mc_list = mc;
900
901 /* Hold this for the code below before we unlock,
902 * it is already exposed via idev->mc_list.
903 */
904 mca_get(mc);
905 write_unlock_bh(&idev->lock);
906
907 mld_del_delrec(idev, &mc->mca_addr);
908 igmp6_group_added(mc);
909 ma_put(mc);
910 return 0;
911 }
912
913 /*
914 * device multicast group del
915 */
916 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
917 {
918 struct ifmcaddr6 *ma, **map;
919
920 ASSERT_RTNL();
921
922 write_lock_bh(&idev->lock);
923 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
924 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
925 if (--ma->mca_users == 0) {
926 *map = ma->next;
927 write_unlock_bh(&idev->lock);
928
929 igmp6_group_dropped(ma);
930
931 ma_put(ma);
932 return 0;
933 }
934 write_unlock_bh(&idev->lock);
935 return 0;
936 }
937 }
938 write_unlock_bh(&idev->lock);
939
940 return -ENOENT;
941 }
942
943 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
944 {
945 struct inet6_dev *idev;
946 int err;
947
948 ASSERT_RTNL();
949
950 idev = __in6_dev_get(dev);
951 if (!idev)
952 err = -ENODEV;
953 else
954 err = __ipv6_dev_mc_dec(idev, addr);
955
956 return err;
957 }
958
959 /*
960 * check if the interface/address pair is valid
961 */
962 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
963 const struct in6_addr *src_addr)
964 {
965 struct inet6_dev *idev;
966 struct ifmcaddr6 *mc;
967 bool rv = false;
968
969 rcu_read_lock();
970 idev = __in6_dev_get(dev);
971 if (idev) {
972 read_lock_bh(&idev->lock);
973 for (mc = idev->mc_list; mc; mc = mc->next) {
974 if (ipv6_addr_equal(&mc->mca_addr, group))
975 break;
976 }
977 if (mc) {
978 if (src_addr && !ipv6_addr_any(src_addr)) {
979 struct ip6_sf_list *psf;
980
981 spin_lock_bh(&mc->mca_lock);
982 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
983 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
984 break;
985 }
986 if (psf)
987 rv = psf->sf_count[MCAST_INCLUDE] ||
988 psf->sf_count[MCAST_EXCLUDE] !=
989 mc->mca_sfcount[MCAST_EXCLUDE];
990 else
991 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
992 spin_unlock_bh(&mc->mca_lock);
993 } else
994 rv = true; /* don't filter unspecified source */
995 }
996 read_unlock_bh(&idev->lock);
997 }
998 rcu_read_unlock();
999 return rv;
1000 }
1001
1002 static void mld_gq_start_timer(struct inet6_dev *idev)
1003 {
1004 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1005
1006 idev->mc_gq_running = 1;
1007 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1008 in6_dev_hold(idev);
1009 }
1010
1011 static void mld_gq_stop_timer(struct inet6_dev *idev)
1012 {
1013 idev->mc_gq_running = 0;
1014 if (del_timer(&idev->mc_gq_timer))
1015 __in6_dev_put(idev);
1016 }
1017
1018 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1019 {
1020 unsigned long tv = prandom_u32() % delay;
1021
1022 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1023 in6_dev_hold(idev);
1024 }
1025
1026 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1027 {
1028 idev->mc_ifc_count = 0;
1029 if (del_timer(&idev->mc_ifc_timer))
1030 __in6_dev_put(idev);
1031 }
1032
1033 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1034 {
1035 unsigned long tv = prandom_u32() % delay;
1036
1037 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1038 in6_dev_hold(idev);
1039 }
1040
1041 static void mld_dad_stop_timer(struct inet6_dev *idev)
1042 {
1043 if (del_timer(&idev->mc_dad_timer))
1044 __in6_dev_put(idev);
1045 }
1046
1047 /*
1048 * IGMP handling (alias multicast ICMPv6 messages)
1049 */
1050
1051 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1052 {
1053 unsigned long delay = resptime;
1054
1055 /* Do not start timer for these addresses */
1056 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1057 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1058 return;
1059
1060 if (del_timer(&ma->mca_timer)) {
1061 atomic_dec(&ma->mca_refcnt);
1062 delay = ma->mca_timer.expires - jiffies;
1063 }
1064
1065 if (delay >= resptime)
1066 delay = prandom_u32() % resptime;
1067
1068 ma->mca_timer.expires = jiffies + delay;
1069 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1070 atomic_inc(&ma->mca_refcnt);
1071 ma->mca_flags |= MAF_TIMER_RUNNING;
1072 }
1073
1074 /* mark EXCLUDE-mode sources */
1075 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1076 const struct in6_addr *srcs)
1077 {
1078 struct ip6_sf_list *psf;
1079 int i, scount;
1080
1081 scount = 0;
1082 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1083 if (scount == nsrcs)
1084 break;
1085 for (i = 0; i < nsrcs; i++) {
1086 /* skip inactive filters */
1087 if (psf->sf_count[MCAST_INCLUDE] ||
1088 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1089 psf->sf_count[MCAST_EXCLUDE])
1090 break;
1091 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1092 scount++;
1093 break;
1094 }
1095 }
1096 }
1097 pmc->mca_flags &= ~MAF_GSQUERY;
1098 if (scount == nsrcs) /* all sources excluded */
1099 return false;
1100 return true;
1101 }
1102
1103 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1104 const struct in6_addr *srcs)
1105 {
1106 struct ip6_sf_list *psf;
1107 int i, scount;
1108
1109 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1110 return mld_xmarksources(pmc, nsrcs, srcs);
1111
1112 /* mark INCLUDE-mode sources */
1113
1114 scount = 0;
1115 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1116 if (scount == nsrcs)
1117 break;
1118 for (i = 0; i < nsrcs; i++) {
1119 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1120 psf->sf_gsresp = 1;
1121 scount++;
1122 break;
1123 }
1124 }
1125 }
1126 if (!scount) {
1127 pmc->mca_flags &= ~MAF_GSQUERY;
1128 return false;
1129 }
1130 pmc->mca_flags |= MAF_GSQUERY;
1131 return true;
1132 }
1133
1134 static int mld_force_mld_version(const struct inet6_dev *idev)
1135 {
1136 /* Normally, both are 0 here. If enforcement to a particular is
1137 * being used, individual device enforcement will have a lower
1138 * precedence over 'all' device (.../conf/all/force_mld_version).
1139 */
1140
1141 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1142 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1143 else
1144 return idev->cnf.force_mld_version;
1145 }
1146
1147 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1148 {
1149 return mld_force_mld_version(idev) == 2;
1150 }
1151
1152 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1153 {
1154 return mld_force_mld_version(idev) == 1;
1155 }
1156
1157 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1158 {
1159 if (mld_in_v2_mode_only(idev))
1160 return false;
1161 if (mld_in_v1_mode_only(idev))
1162 return true;
1163 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1164 return true;
1165
1166 return false;
1167 }
1168
1169 static void mld_set_v1_mode(struct inet6_dev *idev)
1170 {
1171 /* RFC3810, relevant sections:
1172 * - 9.1. Robustness Variable
1173 * - 9.2. Query Interval
1174 * - 9.3. Query Response Interval
1175 * - 9.12. Older Version Querier Present Timeout
1176 */
1177 unsigned long switchback;
1178
1179 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1180
1181 idev->mc_v1_seen = jiffies + switchback;
1182 }
1183
1184 static void mld_update_qrv(struct inet6_dev *idev,
1185 const struct mld2_query *mlh2)
1186 {
1187 /* RFC3810, relevant sections:
1188 * - 5.1.8. QRV (Querier's Robustness Variable)
1189 * - 9.1. Robustness Variable
1190 */
1191
1192 /* The value of the Robustness Variable MUST NOT be zero,
1193 * and SHOULD NOT be one. Catch this here if we ever run
1194 * into such a case in future.
1195 */
1196 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1197 WARN_ON(idev->mc_qrv == 0);
1198
1199 if (mlh2->mld2q_qrv > 0)
1200 idev->mc_qrv = mlh2->mld2q_qrv;
1201
1202 if (unlikely(idev->mc_qrv < min_qrv)) {
1203 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1204 idev->mc_qrv, min_qrv);
1205 idev->mc_qrv = min_qrv;
1206 }
1207 }
1208
1209 static void mld_update_qi(struct inet6_dev *idev,
1210 const struct mld2_query *mlh2)
1211 {
1212 /* RFC3810, relevant sections:
1213 * - 5.1.9. QQIC (Querier's Query Interval Code)
1214 * - 9.2. Query Interval
1215 * - 9.12. Older Version Querier Present Timeout
1216 * (the [Query Interval] in the last Query received)
1217 */
1218 unsigned long mc_qqi;
1219
1220 if (mlh2->mld2q_qqic < 128) {
1221 mc_qqi = mlh2->mld2q_qqic;
1222 } else {
1223 unsigned long mc_man, mc_exp;
1224
1225 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1226 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1227
1228 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1229 }
1230
1231 idev->mc_qi = mc_qqi * HZ;
1232 }
1233
1234 static void mld_update_qri(struct inet6_dev *idev,
1235 const struct mld2_query *mlh2)
1236 {
1237 /* RFC3810, relevant sections:
1238 * - 5.1.3. Maximum Response Code
1239 * - 9.3. Query Response Interval
1240 */
1241 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1242 }
1243
1244 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1245 unsigned long *max_delay, bool v1_query)
1246 {
1247 unsigned long mldv1_md;
1248
1249 /* Ignore v1 queries */
1250 if (mld_in_v2_mode_only(idev))
1251 return -EINVAL;
1252
1253 mldv1_md = ntohs(mld->mld_maxdelay);
1254
1255 /* When in MLDv1 fallback and a MLDv2 router start-up being
1256 * unaware of current MLDv1 operation, the MRC == MRD mapping
1257 * only works when the exponential algorithm is not being
1258 * used (as MLDv1 is unaware of such things).
1259 *
1260 * According to the RFC author, the MLDv2 implementations
1261 * he's aware of all use a MRC < 32768 on start up queries.
1262 *
1263 * Thus, should we *ever* encounter something else larger
1264 * than that, just assume the maximum possible within our
1265 * reach.
1266 */
1267 if (!v1_query)
1268 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1269
1270 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1271
1272 /* MLDv1 router present: we need to go into v1 mode *only*
1273 * when an MLDv1 query is received as per section 9.12. of
1274 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1275 * queries MUST be of exactly 24 octets.
1276 */
1277 if (v1_query)
1278 mld_set_v1_mode(idev);
1279
1280 /* cancel MLDv2 report timer */
1281 mld_gq_stop_timer(idev);
1282 /* cancel the interface change timer */
1283 mld_ifc_stop_timer(idev);
1284 /* clear deleted report items */
1285 mld_clear_delrec(idev);
1286
1287 return 0;
1288 }
1289
1290 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1291 unsigned long *max_delay)
1292 {
1293 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1294
1295 mld_update_qrv(idev, mld);
1296 mld_update_qi(idev, mld);
1297 mld_update_qri(idev, mld);
1298
1299 idev->mc_maxdelay = *max_delay;
1300
1301 return 0;
1302 }
1303
1304 /* called with rcu_read_lock() */
1305 int igmp6_event_query(struct sk_buff *skb)
1306 {
1307 struct mld2_query *mlh2 = NULL;
1308 struct ifmcaddr6 *ma;
1309 const struct in6_addr *group;
1310 unsigned long max_delay;
1311 struct inet6_dev *idev;
1312 struct mld_msg *mld;
1313 int group_type;
1314 int mark = 0;
1315 int len, err;
1316
1317 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1318 return -EINVAL;
1319
1320 /* compute payload length excluding extension headers */
1321 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1322 len -= skb_network_header_len(skb);
1323
1324 /* RFC3810 6.2
1325 * Upon reception of an MLD message that contains a Query, the node
1326 * checks if the source address of the message is a valid link-local
1327 * address, if the Hop Limit is set to 1, and if the Router Alert
1328 * option is present in the Hop-By-Hop Options header of the IPv6
1329 * packet. If any of these checks fails, the packet is dropped.
1330 */
1331 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1332 ipv6_hdr(skb)->hop_limit != 1 ||
1333 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1334 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1335 return -EINVAL;
1336
1337 idev = __in6_dev_get(skb->dev);
1338 if (!idev)
1339 return 0;
1340
1341 mld = (struct mld_msg *)icmp6_hdr(skb);
1342 group = &mld->mld_mca;
1343 group_type = ipv6_addr_type(group);
1344
1345 if (group_type != IPV6_ADDR_ANY &&
1346 !(group_type&IPV6_ADDR_MULTICAST))
1347 return -EINVAL;
1348
1349 if (len < MLD_V1_QUERY_LEN) {
1350 return -EINVAL;
1351 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1352 err = mld_process_v1(idev, mld, &max_delay,
1353 len == MLD_V1_QUERY_LEN);
1354 if (err < 0)
1355 return err;
1356 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1357 int srcs_offset = sizeof(struct mld2_query) -
1358 sizeof(struct icmp6hdr);
1359
1360 if (!pskb_may_pull(skb, srcs_offset))
1361 return -EINVAL;
1362
1363 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1364
1365 err = mld_process_v2(idev, mlh2, &max_delay);
1366 if (err < 0)
1367 return err;
1368
1369 if (group_type == IPV6_ADDR_ANY) { /* general query */
1370 if (mlh2->mld2q_nsrcs)
1371 return -EINVAL; /* no sources allowed */
1372
1373 mld_gq_start_timer(idev);
1374 return 0;
1375 }
1376 /* mark sources to include, if group & source-specific */
1377 if (mlh2->mld2q_nsrcs != 0) {
1378 if (!pskb_may_pull(skb, srcs_offset +
1379 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1380 return -EINVAL;
1381
1382 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1383 mark = 1;
1384 }
1385 } else {
1386 return -EINVAL;
1387 }
1388
1389 read_lock_bh(&idev->lock);
1390 if (group_type == IPV6_ADDR_ANY) {
1391 for (ma = idev->mc_list; ma; ma = ma->next) {
1392 spin_lock_bh(&ma->mca_lock);
1393 igmp6_group_queried(ma, max_delay);
1394 spin_unlock_bh(&ma->mca_lock);
1395 }
1396 } else {
1397 for (ma = idev->mc_list; ma; ma = ma->next) {
1398 if (!ipv6_addr_equal(group, &ma->mca_addr))
1399 continue;
1400 spin_lock_bh(&ma->mca_lock);
1401 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1402 /* gsquery <- gsquery && mark */
1403 if (!mark)
1404 ma->mca_flags &= ~MAF_GSQUERY;
1405 } else {
1406 /* gsquery <- mark */
1407 if (mark)
1408 ma->mca_flags |= MAF_GSQUERY;
1409 else
1410 ma->mca_flags &= ~MAF_GSQUERY;
1411 }
1412 if (!(ma->mca_flags & MAF_GSQUERY) ||
1413 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1414 igmp6_group_queried(ma, max_delay);
1415 spin_unlock_bh(&ma->mca_lock);
1416 break;
1417 }
1418 }
1419 read_unlock_bh(&idev->lock);
1420
1421 return 0;
1422 }
1423
1424 /* called with rcu_read_lock() */
1425 int igmp6_event_report(struct sk_buff *skb)
1426 {
1427 struct ifmcaddr6 *ma;
1428 struct inet6_dev *idev;
1429 struct mld_msg *mld;
1430 int addr_type;
1431
1432 /* Our own report looped back. Ignore it. */
1433 if (skb->pkt_type == PACKET_LOOPBACK)
1434 return 0;
1435
1436 /* send our report if the MC router may not have heard this report */
1437 if (skb->pkt_type != PACKET_MULTICAST &&
1438 skb->pkt_type != PACKET_BROADCAST)
1439 return 0;
1440
1441 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1442 return -EINVAL;
1443
1444 mld = (struct mld_msg *)icmp6_hdr(skb);
1445
1446 /* Drop reports with not link local source */
1447 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1448 if (addr_type != IPV6_ADDR_ANY &&
1449 !(addr_type&IPV6_ADDR_LINKLOCAL))
1450 return -EINVAL;
1451
1452 idev = __in6_dev_get(skb->dev);
1453 if (!idev)
1454 return -ENODEV;
1455
1456 /*
1457 * Cancel the timer for this group
1458 */
1459
1460 read_lock_bh(&idev->lock);
1461 for (ma = idev->mc_list; ma; ma = ma->next) {
1462 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1463 spin_lock(&ma->mca_lock);
1464 if (del_timer(&ma->mca_timer))
1465 atomic_dec(&ma->mca_refcnt);
1466 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1467 spin_unlock(&ma->mca_lock);
1468 break;
1469 }
1470 }
1471 read_unlock_bh(&idev->lock);
1472 return 0;
1473 }
1474
1475 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1476 int gdeleted, int sdeleted)
1477 {
1478 switch (type) {
1479 case MLD2_MODE_IS_INCLUDE:
1480 case MLD2_MODE_IS_EXCLUDE:
1481 if (gdeleted || sdeleted)
1482 return false;
1483 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1484 if (pmc->mca_sfmode == MCAST_INCLUDE)
1485 return true;
1486 /* don't include if this source is excluded
1487 * in all filters
1488 */
1489 if (psf->sf_count[MCAST_INCLUDE])
1490 return type == MLD2_MODE_IS_INCLUDE;
1491 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1492 psf->sf_count[MCAST_EXCLUDE];
1493 }
1494 return false;
1495 case MLD2_CHANGE_TO_INCLUDE:
1496 if (gdeleted || sdeleted)
1497 return false;
1498 return psf->sf_count[MCAST_INCLUDE] != 0;
1499 case MLD2_CHANGE_TO_EXCLUDE:
1500 if (gdeleted || sdeleted)
1501 return false;
1502 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1503 psf->sf_count[MCAST_INCLUDE])
1504 return false;
1505 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1506 psf->sf_count[MCAST_EXCLUDE];
1507 case MLD2_ALLOW_NEW_SOURCES:
1508 if (gdeleted || !psf->sf_crcount)
1509 return false;
1510 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1511 case MLD2_BLOCK_OLD_SOURCES:
1512 if (pmc->mca_sfmode == MCAST_INCLUDE)
1513 return gdeleted || (psf->sf_crcount && sdeleted);
1514 return psf->sf_crcount && !gdeleted && !sdeleted;
1515 }
1516 return false;
1517 }
1518
1519 static int
1520 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1521 {
1522 struct ip6_sf_list *psf;
1523 int scount = 0;
1524
1525 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1526 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1527 continue;
1528 scount++;
1529 }
1530 return scount;
1531 }
1532
1533 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1534 struct net_device *dev,
1535 const struct in6_addr *saddr,
1536 const struct in6_addr *daddr,
1537 int proto, int len)
1538 {
1539 struct ipv6hdr *hdr;
1540
1541 skb->protocol = htons(ETH_P_IPV6);
1542 skb->dev = dev;
1543
1544 skb_reset_network_header(skb);
1545 skb_put(skb, sizeof(struct ipv6hdr));
1546 hdr = ipv6_hdr(skb);
1547
1548 ip6_flow_hdr(hdr, 0, 0);
1549
1550 hdr->payload_len = htons(len);
1551 hdr->nexthdr = proto;
1552 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1553
1554 hdr->saddr = *saddr;
1555 hdr->daddr = *daddr;
1556 }
1557
1558 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1559 {
1560 struct net_device *dev = idev->dev;
1561 struct net *net = dev_net(dev);
1562 struct sock *sk = net->ipv6.igmp_sk;
1563 struct sk_buff *skb;
1564 struct mld2_report *pmr;
1565 struct in6_addr addr_buf;
1566 const struct in6_addr *saddr;
1567 int hlen = LL_RESERVED_SPACE(dev);
1568 int tlen = dev->needed_tailroom;
1569 unsigned int size = mtu + hlen + tlen;
1570 int err;
1571 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1572 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1573 IPV6_TLV_PADN, 0 };
1574
1575 /* we assume size > sizeof(ra) here */
1576 /* limit our allocations to order-0 page */
1577 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1578 skb = sock_alloc_send_skb(sk, size, 1, &err);
1579
1580 if (!skb)
1581 return NULL;
1582
1583 skb->priority = TC_PRIO_CONTROL;
1584 skb_reserve(skb, hlen);
1585 skb_tailroom_reserve(skb, mtu, tlen);
1586
1587 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1588 /* <draft-ietf-magma-mld-source-05.txt>:
1589 * use unspecified address as the source address
1590 * when a valid link-local address is not available.
1591 */
1592 saddr = &in6addr_any;
1593 } else
1594 saddr = &addr_buf;
1595
1596 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1597
1598 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1599
1600 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1601 skb_put(skb, sizeof(*pmr));
1602 pmr = (struct mld2_report *)skb_transport_header(skb);
1603 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1604 pmr->mld2r_resv1 = 0;
1605 pmr->mld2r_cksum = 0;
1606 pmr->mld2r_resv2 = 0;
1607 pmr->mld2r_ngrec = 0;
1608 return skb;
1609 }
1610
1611 static void mld_sendpack(struct sk_buff *skb)
1612 {
1613 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1614 struct mld2_report *pmr =
1615 (struct mld2_report *)skb_transport_header(skb);
1616 int payload_len, mldlen;
1617 struct inet6_dev *idev;
1618 struct net *net = dev_net(skb->dev);
1619 int err;
1620 struct flowi6 fl6;
1621 struct dst_entry *dst;
1622
1623 rcu_read_lock();
1624 idev = __in6_dev_get(skb->dev);
1625 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1626
1627 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1628 sizeof(*pip6);
1629 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1630 pip6->payload_len = htons(payload_len);
1631
1632 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1633 IPPROTO_ICMPV6,
1634 csum_partial(skb_transport_header(skb),
1635 mldlen, 0));
1636
1637 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1638 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1639 skb->dev->ifindex);
1640 dst = icmp6_dst_alloc(skb->dev, &fl6);
1641
1642 err = 0;
1643 if (IS_ERR(dst)) {
1644 err = PTR_ERR(dst);
1645 dst = NULL;
1646 }
1647 skb_dst_set(skb, dst);
1648 if (err)
1649 goto err_out;
1650
1651 payload_len = skb->len;
1652
1653 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1654 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1655 dst_output);
1656 out:
1657 if (!err) {
1658 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1659 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1660 } else {
1661 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1662 }
1663
1664 rcu_read_unlock();
1665 return;
1666
1667 err_out:
1668 kfree_skb(skb);
1669 goto out;
1670 }
1671
1672 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1673 {
1674 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1675 }
1676
1677 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1678 int type, struct mld2_grec **ppgr)
1679 {
1680 struct net_device *dev = pmc->idev->dev;
1681 struct mld2_report *pmr;
1682 struct mld2_grec *pgr;
1683
1684 if (!skb)
1685 skb = mld_newpack(pmc->idev, dev->mtu);
1686 if (!skb)
1687 return NULL;
1688 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1689 pgr->grec_type = type;
1690 pgr->grec_auxwords = 0;
1691 pgr->grec_nsrcs = 0;
1692 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1693 pmr = (struct mld2_report *)skb_transport_header(skb);
1694 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1695 *ppgr = pgr;
1696 return skb;
1697 }
1698
1699 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1700
1701 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1702 int type, int gdeleted, int sdeleted, int crsend)
1703 {
1704 struct inet6_dev *idev = pmc->idev;
1705 struct net_device *dev = idev->dev;
1706 struct mld2_report *pmr;
1707 struct mld2_grec *pgr = NULL;
1708 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1709 int scount, stotal, first, isquery, truncate;
1710
1711 if (pmc->mca_flags & MAF_NOREPORT)
1712 return skb;
1713
1714 isquery = type == MLD2_MODE_IS_INCLUDE ||
1715 type == MLD2_MODE_IS_EXCLUDE;
1716 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1717 type == MLD2_CHANGE_TO_EXCLUDE;
1718
1719 stotal = scount = 0;
1720
1721 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1722
1723 if (!*psf_list)
1724 goto empty_source;
1725
1726 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1727
1728 /* EX and TO_EX get a fresh packet, if needed */
1729 if (truncate) {
1730 if (pmr && pmr->mld2r_ngrec &&
1731 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1732 if (skb)
1733 mld_sendpack(skb);
1734 skb = mld_newpack(idev, dev->mtu);
1735 }
1736 }
1737 first = 1;
1738 psf_prev = NULL;
1739 for (psf = *psf_list; psf; psf = psf_next) {
1740 struct in6_addr *psrc;
1741
1742 psf_next = psf->sf_next;
1743
1744 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1745 psf_prev = psf;
1746 continue;
1747 }
1748
1749 /* Based on RFC3810 6.1. Should not send source-list change
1750 * records when there is a filter mode change.
1751 */
1752 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1753 (!gdeleted && pmc->mca_crcount)) &&
1754 (type == MLD2_ALLOW_NEW_SOURCES ||
1755 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1756 goto decrease_sf_crcount;
1757
1758 /* clear marks on query responses */
1759 if (isquery)
1760 psf->sf_gsresp = 0;
1761
1762 if (AVAILABLE(skb) < sizeof(*psrc) +
1763 first*sizeof(struct mld2_grec)) {
1764 if (truncate && !first)
1765 break; /* truncate these */
1766 if (pgr)
1767 pgr->grec_nsrcs = htons(scount);
1768 if (skb)
1769 mld_sendpack(skb);
1770 skb = mld_newpack(idev, dev->mtu);
1771 first = 1;
1772 scount = 0;
1773 }
1774 if (first) {
1775 skb = add_grhead(skb, pmc, type, &pgr);
1776 first = 0;
1777 }
1778 if (!skb)
1779 return NULL;
1780 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1781 *psrc = psf->sf_addr;
1782 scount++; stotal++;
1783 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1784 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1785 decrease_sf_crcount:
1786 psf->sf_crcount--;
1787 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1788 if (psf_prev)
1789 psf_prev->sf_next = psf->sf_next;
1790 else
1791 *psf_list = psf->sf_next;
1792 kfree(psf);
1793 continue;
1794 }
1795 }
1796 psf_prev = psf;
1797 }
1798
1799 empty_source:
1800 if (!stotal) {
1801 if (type == MLD2_ALLOW_NEW_SOURCES ||
1802 type == MLD2_BLOCK_OLD_SOURCES)
1803 return skb;
1804 if (pmc->mca_crcount || isquery || crsend) {
1805 /* make sure we have room for group header */
1806 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1807 mld_sendpack(skb);
1808 skb = NULL; /* add_grhead will get a new one */
1809 }
1810 skb = add_grhead(skb, pmc, type, &pgr);
1811 }
1812 }
1813 if (pgr)
1814 pgr->grec_nsrcs = htons(scount);
1815
1816 if (isquery)
1817 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1818 return skb;
1819 }
1820
1821 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1822 {
1823 struct sk_buff *skb = NULL;
1824 int type;
1825
1826 read_lock_bh(&idev->lock);
1827 if (!pmc) {
1828 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1829 if (pmc->mca_flags & MAF_NOREPORT)
1830 continue;
1831 spin_lock_bh(&pmc->mca_lock);
1832 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1833 type = MLD2_MODE_IS_EXCLUDE;
1834 else
1835 type = MLD2_MODE_IS_INCLUDE;
1836 skb = add_grec(skb, pmc, type, 0, 0, 0);
1837 spin_unlock_bh(&pmc->mca_lock);
1838 }
1839 } else {
1840 spin_lock_bh(&pmc->mca_lock);
1841 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1842 type = MLD2_MODE_IS_EXCLUDE;
1843 else
1844 type = MLD2_MODE_IS_INCLUDE;
1845 skb = add_grec(skb, pmc, type, 0, 0, 0);
1846 spin_unlock_bh(&pmc->mca_lock);
1847 }
1848 read_unlock_bh(&idev->lock);
1849 if (skb)
1850 mld_sendpack(skb);
1851 }
1852
1853 /*
1854 * remove zero-count source records from a source filter list
1855 */
1856 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1857 {
1858 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1859
1860 psf_prev = NULL;
1861 for (psf = *ppsf; psf; psf = psf_next) {
1862 psf_next = psf->sf_next;
1863 if (psf->sf_crcount == 0) {
1864 if (psf_prev)
1865 psf_prev->sf_next = psf->sf_next;
1866 else
1867 *ppsf = psf->sf_next;
1868 kfree(psf);
1869 } else
1870 psf_prev = psf;
1871 }
1872 }
1873
1874 static void mld_send_cr(struct inet6_dev *idev)
1875 {
1876 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1877 struct sk_buff *skb = NULL;
1878 int type, dtype;
1879
1880 read_lock_bh(&idev->lock);
1881 spin_lock(&idev->mc_lock);
1882
1883 /* deleted MCA's */
1884 pmc_prev = NULL;
1885 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1886 pmc_next = pmc->next;
1887 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1888 type = MLD2_BLOCK_OLD_SOURCES;
1889 dtype = MLD2_BLOCK_OLD_SOURCES;
1890 skb = add_grec(skb, pmc, type, 1, 0, 0);
1891 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1892 }
1893 if (pmc->mca_crcount) {
1894 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1895 type = MLD2_CHANGE_TO_INCLUDE;
1896 skb = add_grec(skb, pmc, type, 1, 0, 0);
1897 }
1898 pmc->mca_crcount--;
1899 if (pmc->mca_crcount == 0) {
1900 mld_clear_zeros(&pmc->mca_tomb);
1901 mld_clear_zeros(&pmc->mca_sources);
1902 }
1903 }
1904 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1905 !pmc->mca_sources) {
1906 if (pmc_prev)
1907 pmc_prev->next = pmc_next;
1908 else
1909 idev->mc_tomb = pmc_next;
1910 in6_dev_put(pmc->idev);
1911 kfree(pmc);
1912 } else
1913 pmc_prev = pmc;
1914 }
1915 spin_unlock(&idev->mc_lock);
1916
1917 /* change recs */
1918 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1919 spin_lock_bh(&pmc->mca_lock);
1920 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1921 type = MLD2_BLOCK_OLD_SOURCES;
1922 dtype = MLD2_ALLOW_NEW_SOURCES;
1923 } else {
1924 type = MLD2_ALLOW_NEW_SOURCES;
1925 dtype = MLD2_BLOCK_OLD_SOURCES;
1926 }
1927 skb = add_grec(skb, pmc, type, 0, 0, 0);
1928 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1929
1930 /* filter mode changes */
1931 if (pmc->mca_crcount) {
1932 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1933 type = MLD2_CHANGE_TO_EXCLUDE;
1934 else
1935 type = MLD2_CHANGE_TO_INCLUDE;
1936 skb = add_grec(skb, pmc, type, 0, 0, 0);
1937 pmc->mca_crcount--;
1938 }
1939 spin_unlock_bh(&pmc->mca_lock);
1940 }
1941 read_unlock_bh(&idev->lock);
1942 if (!skb)
1943 return;
1944 (void) mld_sendpack(skb);
1945 }
1946
1947 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1948 {
1949 struct net *net = dev_net(dev);
1950 struct sock *sk = net->ipv6.igmp_sk;
1951 struct inet6_dev *idev;
1952 struct sk_buff *skb;
1953 struct mld_msg *hdr;
1954 const struct in6_addr *snd_addr, *saddr;
1955 struct in6_addr addr_buf;
1956 int hlen = LL_RESERVED_SPACE(dev);
1957 int tlen = dev->needed_tailroom;
1958 int err, len, payload_len, full_len;
1959 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1960 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1961 IPV6_TLV_PADN, 0 };
1962 struct flowi6 fl6;
1963 struct dst_entry *dst;
1964
1965 if (type == ICMPV6_MGM_REDUCTION)
1966 snd_addr = &in6addr_linklocal_allrouters;
1967 else
1968 snd_addr = addr;
1969
1970 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1971 payload_len = len + sizeof(ra);
1972 full_len = sizeof(struct ipv6hdr) + payload_len;
1973
1974 rcu_read_lock();
1975 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1976 IPSTATS_MIB_OUT, full_len);
1977 rcu_read_unlock();
1978
1979 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1980
1981 if (!skb) {
1982 rcu_read_lock();
1983 IP6_INC_STATS(net, __in6_dev_get(dev),
1984 IPSTATS_MIB_OUTDISCARDS);
1985 rcu_read_unlock();
1986 return;
1987 }
1988 skb->priority = TC_PRIO_CONTROL;
1989 skb_reserve(skb, hlen);
1990
1991 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1992 /* <draft-ietf-magma-mld-source-05.txt>:
1993 * use unspecified address as the source address
1994 * when a valid link-local address is not available.
1995 */
1996 saddr = &in6addr_any;
1997 } else
1998 saddr = &addr_buf;
1999
2000 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2001
2002 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
2003
2004 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
2005 memset(hdr, 0, sizeof(struct mld_msg));
2006 hdr->mld_type = type;
2007 hdr->mld_mca = *addr;
2008
2009 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2010 IPPROTO_ICMPV6,
2011 csum_partial(hdr, len, 0));
2012
2013 rcu_read_lock();
2014 idev = __in6_dev_get(skb->dev);
2015
2016 icmpv6_flow_init(sk, &fl6, type,
2017 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2018 skb->dev->ifindex);
2019 dst = icmp6_dst_alloc(skb->dev, &fl6);
2020 if (IS_ERR(dst)) {
2021 err = PTR_ERR(dst);
2022 goto err_out;
2023 }
2024
2025 skb_dst_set(skb, dst);
2026 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2027 net, sk, skb, NULL, skb->dev,
2028 dst_output);
2029 out:
2030 if (!err) {
2031 ICMP6MSGOUT_INC_STATS(net, idev, type);
2032 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2033 } else
2034 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2035
2036 rcu_read_unlock();
2037 return;
2038
2039 err_out:
2040 kfree_skb(skb);
2041 goto out;
2042 }
2043
2044 static void mld_send_initial_cr(struct inet6_dev *idev)
2045 {
2046 struct sk_buff *skb;
2047 struct ifmcaddr6 *pmc;
2048 int type;
2049
2050 if (mld_in_v1_mode(idev))
2051 return;
2052
2053 skb = NULL;
2054 read_lock_bh(&idev->lock);
2055 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2056 spin_lock_bh(&pmc->mca_lock);
2057 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2058 type = MLD2_CHANGE_TO_EXCLUDE;
2059 else
2060 type = MLD2_CHANGE_TO_INCLUDE;
2061 skb = add_grec(skb, pmc, type, 0, 0, 1);
2062 spin_unlock_bh(&pmc->mca_lock);
2063 }
2064 read_unlock_bh(&idev->lock);
2065 if (skb)
2066 mld_sendpack(skb);
2067 }
2068
2069 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2070 {
2071 idev->mc_dad_count = idev->mc_qrv;
2072 if (idev->mc_dad_count) {
2073 mld_send_initial_cr(idev);
2074 idev->mc_dad_count--;
2075 if (idev->mc_dad_count)
2076 mld_dad_start_timer(idev, idev->mc_maxdelay);
2077 }
2078 }
2079
2080 static void mld_dad_timer_expire(unsigned long data)
2081 {
2082 struct inet6_dev *idev = (struct inet6_dev *)data;
2083
2084 mld_send_initial_cr(idev);
2085 if (idev->mc_dad_count) {
2086 idev->mc_dad_count--;
2087 if (idev->mc_dad_count)
2088 mld_dad_start_timer(idev, idev->mc_maxdelay);
2089 }
2090 in6_dev_put(idev);
2091 }
2092
2093 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2094 const struct in6_addr *psfsrc)
2095 {
2096 struct ip6_sf_list *psf, *psf_prev;
2097 int rv = 0;
2098
2099 psf_prev = NULL;
2100 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2101 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2102 break;
2103 psf_prev = psf;
2104 }
2105 if (!psf || psf->sf_count[sfmode] == 0) {
2106 /* source filter not found, or count wrong => bug */
2107 return -ESRCH;
2108 }
2109 psf->sf_count[sfmode]--;
2110 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2111 struct inet6_dev *idev = pmc->idev;
2112
2113 /* no more filters for this source */
2114 if (psf_prev)
2115 psf_prev->sf_next = psf->sf_next;
2116 else
2117 pmc->mca_sources = psf->sf_next;
2118 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2119 !mld_in_v1_mode(idev)) {
2120 psf->sf_crcount = idev->mc_qrv;
2121 psf->sf_next = pmc->mca_tomb;
2122 pmc->mca_tomb = psf;
2123 rv = 1;
2124 } else
2125 kfree(psf);
2126 }
2127 return rv;
2128 }
2129
2130 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2131 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2132 int delta)
2133 {
2134 struct ifmcaddr6 *pmc;
2135 int changerec = 0;
2136 int i, err;
2137
2138 if (!idev)
2139 return -ENODEV;
2140 read_lock_bh(&idev->lock);
2141 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2142 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2143 break;
2144 }
2145 if (!pmc) {
2146 /* MCA not found?? bug */
2147 read_unlock_bh(&idev->lock);
2148 return -ESRCH;
2149 }
2150 spin_lock_bh(&pmc->mca_lock);
2151 sf_markstate(pmc);
2152 if (!delta) {
2153 if (!pmc->mca_sfcount[sfmode]) {
2154 spin_unlock_bh(&pmc->mca_lock);
2155 read_unlock_bh(&idev->lock);
2156 return -EINVAL;
2157 }
2158 pmc->mca_sfcount[sfmode]--;
2159 }
2160 err = 0;
2161 for (i = 0; i < sfcount; i++) {
2162 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2163
2164 changerec |= rv > 0;
2165 if (!err && rv < 0)
2166 err = rv;
2167 }
2168 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2169 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2170 pmc->mca_sfcount[MCAST_INCLUDE]) {
2171 struct ip6_sf_list *psf;
2172
2173 /* filter mode change */
2174 pmc->mca_sfmode = MCAST_INCLUDE;
2175 pmc->mca_crcount = idev->mc_qrv;
2176 idev->mc_ifc_count = pmc->mca_crcount;
2177 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2178 psf->sf_crcount = 0;
2179 mld_ifc_event(pmc->idev);
2180 } else if (sf_setstate(pmc) || changerec)
2181 mld_ifc_event(pmc->idev);
2182 spin_unlock_bh(&pmc->mca_lock);
2183 read_unlock_bh(&idev->lock);
2184 return err;
2185 }
2186
2187 /*
2188 * Add multicast single-source filter to the interface list
2189 */
2190 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2191 const struct in6_addr *psfsrc)
2192 {
2193 struct ip6_sf_list *psf, *psf_prev;
2194
2195 psf_prev = NULL;
2196 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2197 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2198 break;
2199 psf_prev = psf;
2200 }
2201 if (!psf) {
2202 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2203 if (!psf)
2204 return -ENOBUFS;
2205
2206 psf->sf_addr = *psfsrc;
2207 if (psf_prev) {
2208 psf_prev->sf_next = psf;
2209 } else
2210 pmc->mca_sources = psf;
2211 }
2212 psf->sf_count[sfmode]++;
2213 return 0;
2214 }
2215
2216 static void sf_markstate(struct ifmcaddr6 *pmc)
2217 {
2218 struct ip6_sf_list *psf;
2219 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2220
2221 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2222 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2223 psf->sf_oldin = mca_xcount ==
2224 psf->sf_count[MCAST_EXCLUDE] &&
2225 !psf->sf_count[MCAST_INCLUDE];
2226 } else
2227 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2228 }
2229
2230 static int sf_setstate(struct ifmcaddr6 *pmc)
2231 {
2232 struct ip6_sf_list *psf, *dpsf;
2233 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2234 int qrv = pmc->idev->mc_qrv;
2235 int new_in, rv;
2236
2237 rv = 0;
2238 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2239 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2240 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2241 !psf->sf_count[MCAST_INCLUDE];
2242 } else
2243 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2244 if (new_in) {
2245 if (!psf->sf_oldin) {
2246 struct ip6_sf_list *prev = NULL;
2247
2248 for (dpsf = pmc->mca_tomb; dpsf;
2249 dpsf = dpsf->sf_next) {
2250 if (ipv6_addr_equal(&dpsf->sf_addr,
2251 &psf->sf_addr))
2252 break;
2253 prev = dpsf;
2254 }
2255 if (dpsf) {
2256 if (prev)
2257 prev->sf_next = dpsf->sf_next;
2258 else
2259 pmc->mca_tomb = dpsf->sf_next;
2260 kfree(dpsf);
2261 }
2262 psf->sf_crcount = qrv;
2263 rv++;
2264 }
2265 } else if (psf->sf_oldin) {
2266 psf->sf_crcount = 0;
2267 /*
2268 * add or update "delete" records if an active filter
2269 * is now inactive
2270 */
2271 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2272 if (ipv6_addr_equal(&dpsf->sf_addr,
2273 &psf->sf_addr))
2274 break;
2275 if (!dpsf) {
2276 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2277 if (!dpsf)
2278 continue;
2279 *dpsf = *psf;
2280 /* pmc->mca_lock held by callers */
2281 dpsf->sf_next = pmc->mca_tomb;
2282 pmc->mca_tomb = dpsf;
2283 }
2284 dpsf->sf_crcount = qrv;
2285 rv++;
2286 }
2287 }
2288 return rv;
2289 }
2290
2291 /*
2292 * Add multicast source filter list to the interface list
2293 */
2294 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2295 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2296 int delta)
2297 {
2298 struct ifmcaddr6 *pmc;
2299 int isexclude;
2300 int i, err;
2301
2302 if (!idev)
2303 return -ENODEV;
2304 read_lock_bh(&idev->lock);
2305 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2306 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2307 break;
2308 }
2309 if (!pmc) {
2310 /* MCA not found?? bug */
2311 read_unlock_bh(&idev->lock);
2312 return -ESRCH;
2313 }
2314 spin_lock_bh(&pmc->mca_lock);
2315
2316 sf_markstate(pmc);
2317 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2318 if (!delta)
2319 pmc->mca_sfcount[sfmode]++;
2320 err = 0;
2321 for (i = 0; i < sfcount; i++) {
2322 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2323 if (err)
2324 break;
2325 }
2326 if (err) {
2327 int j;
2328
2329 if (!delta)
2330 pmc->mca_sfcount[sfmode]--;
2331 for (j = 0; j < i; j++)
2332 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2333 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2334 struct ip6_sf_list *psf;
2335
2336 /* filter mode change */
2337 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2338 pmc->mca_sfmode = MCAST_EXCLUDE;
2339 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2340 pmc->mca_sfmode = MCAST_INCLUDE;
2341 /* else no filters; keep old mode for reports */
2342
2343 pmc->mca_crcount = idev->mc_qrv;
2344 idev->mc_ifc_count = pmc->mca_crcount;
2345 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2346 psf->sf_crcount = 0;
2347 mld_ifc_event(idev);
2348 } else if (sf_setstate(pmc))
2349 mld_ifc_event(idev);
2350 spin_unlock_bh(&pmc->mca_lock);
2351 read_unlock_bh(&idev->lock);
2352 return err;
2353 }
2354
2355 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2356 {
2357 struct ip6_sf_list *psf, *nextpsf;
2358
2359 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2360 nextpsf = psf->sf_next;
2361 kfree(psf);
2362 }
2363 pmc->mca_tomb = NULL;
2364 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2365 nextpsf = psf->sf_next;
2366 kfree(psf);
2367 }
2368 pmc->mca_sources = NULL;
2369 pmc->mca_sfmode = MCAST_EXCLUDE;
2370 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2371 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2372 }
2373
2374
2375 static void igmp6_join_group(struct ifmcaddr6 *ma)
2376 {
2377 unsigned long delay;
2378
2379 if (ma->mca_flags & MAF_NOREPORT)
2380 return;
2381
2382 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2383
2384 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2385
2386 spin_lock_bh(&ma->mca_lock);
2387 if (del_timer(&ma->mca_timer)) {
2388 atomic_dec(&ma->mca_refcnt);
2389 delay = ma->mca_timer.expires - jiffies;
2390 }
2391
2392 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2393 atomic_inc(&ma->mca_refcnt);
2394 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2395 spin_unlock_bh(&ma->mca_lock);
2396 }
2397
2398 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2399 struct inet6_dev *idev)
2400 {
2401 int err;
2402
2403 /* callers have the socket lock and rtnl lock
2404 * so no other readers or writers of iml or its sflist
2405 */
2406 if (!iml->sflist) {
2407 /* any-source empty exclude case */
2408 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2409 }
2410 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2411 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2412 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2413 iml->sflist = NULL;
2414 return err;
2415 }
2416
2417 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2418 {
2419 if (mld_in_v1_mode(ma->idev)) {
2420 if (ma->mca_flags & MAF_LAST_REPORTER)
2421 igmp6_send(&ma->mca_addr, ma->idev->dev,
2422 ICMPV6_MGM_REDUCTION);
2423 } else {
2424 mld_add_delrec(ma->idev, ma);
2425 mld_ifc_event(ma->idev);
2426 }
2427 }
2428
2429 static void mld_gq_timer_expire(unsigned long data)
2430 {
2431 struct inet6_dev *idev = (struct inet6_dev *)data;
2432
2433 idev->mc_gq_running = 0;
2434 mld_send_report(idev, NULL);
2435 in6_dev_put(idev);
2436 }
2437
2438 static void mld_ifc_timer_expire(unsigned long data)
2439 {
2440 struct inet6_dev *idev = (struct inet6_dev *)data;
2441
2442 mld_send_cr(idev);
2443 if (idev->mc_ifc_count) {
2444 idev->mc_ifc_count--;
2445 if (idev->mc_ifc_count)
2446 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2447 }
2448 in6_dev_put(idev);
2449 }
2450
2451 static void mld_ifc_event(struct inet6_dev *idev)
2452 {
2453 if (mld_in_v1_mode(idev))
2454 return;
2455 idev->mc_ifc_count = idev->mc_qrv;
2456 mld_ifc_start_timer(idev, 1);
2457 }
2458
2459
2460 static void igmp6_timer_handler(unsigned long data)
2461 {
2462 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2463
2464 if (mld_in_v1_mode(ma->idev))
2465 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2466 else
2467 mld_send_report(ma->idev, ma);
2468
2469 spin_lock(&ma->mca_lock);
2470 ma->mca_flags |= MAF_LAST_REPORTER;
2471 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2472 spin_unlock(&ma->mca_lock);
2473 ma_put(ma);
2474 }
2475
2476 /* Device changing type */
2477
2478 void ipv6_mc_unmap(struct inet6_dev *idev)
2479 {
2480 struct ifmcaddr6 *i;
2481
2482 /* Install multicast list, except for all-nodes (already installed) */
2483
2484 read_lock_bh(&idev->lock);
2485 for (i = idev->mc_list; i; i = i->next)
2486 igmp6_group_dropped(i);
2487 read_unlock_bh(&idev->lock);
2488 }
2489
2490 void ipv6_mc_remap(struct inet6_dev *idev)
2491 {
2492 ipv6_mc_up(idev);
2493 }
2494
2495 /* Device going down */
2496
2497 void ipv6_mc_down(struct inet6_dev *idev)
2498 {
2499 struct ifmcaddr6 *i;
2500
2501 /* Withdraw multicast list */
2502
2503 read_lock_bh(&idev->lock);
2504 mld_ifc_stop_timer(idev);
2505 mld_gq_stop_timer(idev);
2506 mld_dad_stop_timer(idev);
2507
2508 for (i = idev->mc_list; i; i = i->next)
2509 igmp6_group_dropped(i);
2510 read_unlock_bh(&idev->lock);
2511
2512 mld_clear_delrec(idev);
2513 }
2514
2515 static void ipv6_mc_reset(struct inet6_dev *idev)
2516 {
2517 idev->mc_qrv = sysctl_mld_qrv;
2518 idev->mc_qi = MLD_QI_DEFAULT;
2519 idev->mc_qri = MLD_QRI_DEFAULT;
2520 idev->mc_v1_seen = 0;
2521 idev->mc_maxdelay = unsolicited_report_interval(idev);
2522 }
2523
2524 /* Device going up */
2525
2526 void ipv6_mc_up(struct inet6_dev *idev)
2527 {
2528 struct ifmcaddr6 *i;
2529
2530 /* Install multicast list, except for all-nodes (already installed) */
2531
2532 read_lock_bh(&idev->lock);
2533 ipv6_mc_reset(idev);
2534 for (i = idev->mc_list; i; i = i->next)
2535 igmp6_group_added(i);
2536 read_unlock_bh(&idev->lock);
2537 }
2538
2539 /* IPv6 device initialization. */
2540
2541 void ipv6_mc_init_dev(struct inet6_dev *idev)
2542 {
2543 write_lock_bh(&idev->lock);
2544 spin_lock_init(&idev->mc_lock);
2545 idev->mc_gq_running = 0;
2546 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2547 (unsigned long)idev);
2548 idev->mc_tomb = NULL;
2549 idev->mc_ifc_count = 0;
2550 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2551 (unsigned long)idev);
2552 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2553 (unsigned long)idev);
2554 ipv6_mc_reset(idev);
2555 write_unlock_bh(&idev->lock);
2556 }
2557
2558 /*
2559 * Device is about to be destroyed: clean up.
2560 */
2561
2562 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2563 {
2564 struct ifmcaddr6 *i;
2565
2566 /* Deactivate timers */
2567 ipv6_mc_down(idev);
2568
2569 /* Delete all-nodes address. */
2570 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2571 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2572 * fail.
2573 */
2574 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2575
2576 if (idev->cnf.forwarding)
2577 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2578
2579 write_lock_bh(&idev->lock);
2580 while ((i = idev->mc_list) != NULL) {
2581 idev->mc_list = i->next;
2582 write_unlock_bh(&idev->lock);
2583
2584 igmp6_group_dropped(i);
2585 ma_put(i);
2586
2587 write_lock_bh(&idev->lock);
2588 }
2589 write_unlock_bh(&idev->lock);
2590 }
2591
2592 #ifdef CONFIG_PROC_FS
2593 struct igmp6_mc_iter_state {
2594 struct seq_net_private p;
2595 struct net_device *dev;
2596 struct inet6_dev *idev;
2597 };
2598
2599 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2600
2601 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2602 {
2603 struct ifmcaddr6 *im = NULL;
2604 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2605 struct net *net = seq_file_net(seq);
2606
2607 state->idev = NULL;
2608 for_each_netdev_rcu(net, state->dev) {
2609 struct inet6_dev *idev;
2610 idev = __in6_dev_get(state->dev);
2611 if (!idev)
2612 continue;
2613 read_lock_bh(&idev->lock);
2614 im = idev->mc_list;
2615 if (im) {
2616 state->idev = idev;
2617 break;
2618 }
2619 read_unlock_bh(&idev->lock);
2620 }
2621 return im;
2622 }
2623
2624 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2625 {
2626 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2627
2628 im = im->next;
2629 while (!im) {
2630 if (likely(state->idev))
2631 read_unlock_bh(&state->idev->lock);
2632
2633 state->dev = next_net_device_rcu(state->dev);
2634 if (!state->dev) {
2635 state->idev = NULL;
2636 break;
2637 }
2638 state->idev = __in6_dev_get(state->dev);
2639 if (!state->idev)
2640 continue;
2641 read_lock_bh(&state->idev->lock);
2642 im = state->idev->mc_list;
2643 }
2644 return im;
2645 }
2646
2647 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2648 {
2649 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2650 if (im)
2651 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2652 --pos;
2653 return pos ? NULL : im;
2654 }
2655
2656 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2657 __acquires(RCU)
2658 {
2659 rcu_read_lock();
2660 return igmp6_mc_get_idx(seq, *pos);
2661 }
2662
2663 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2664 {
2665 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2666
2667 ++*pos;
2668 return im;
2669 }
2670
2671 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2672 __releases(RCU)
2673 {
2674 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2675
2676 if (likely(state->idev)) {
2677 read_unlock_bh(&state->idev->lock);
2678 state->idev = NULL;
2679 }
2680 state->dev = NULL;
2681 rcu_read_unlock();
2682 }
2683
2684 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2685 {
2686 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2687 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2688
2689 seq_printf(seq,
2690 "%-4d %-15s %pi6 %5d %08X %ld\n",
2691 state->dev->ifindex, state->dev->name,
2692 &im->mca_addr,
2693 im->mca_users, im->mca_flags,
2694 (im->mca_flags&MAF_TIMER_RUNNING) ?
2695 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2696 return 0;
2697 }
2698
2699 static const struct seq_operations igmp6_mc_seq_ops = {
2700 .start = igmp6_mc_seq_start,
2701 .next = igmp6_mc_seq_next,
2702 .stop = igmp6_mc_seq_stop,
2703 .show = igmp6_mc_seq_show,
2704 };
2705
2706 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2707 {
2708 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2709 sizeof(struct igmp6_mc_iter_state));
2710 }
2711
2712 static const struct file_operations igmp6_mc_seq_fops = {
2713 .owner = THIS_MODULE,
2714 .open = igmp6_mc_seq_open,
2715 .read = seq_read,
2716 .llseek = seq_lseek,
2717 .release = seq_release_net,
2718 };
2719
2720 struct igmp6_mcf_iter_state {
2721 struct seq_net_private p;
2722 struct net_device *dev;
2723 struct inet6_dev *idev;
2724 struct ifmcaddr6 *im;
2725 };
2726
2727 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2728
2729 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2730 {
2731 struct ip6_sf_list *psf = NULL;
2732 struct ifmcaddr6 *im = NULL;
2733 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2734 struct net *net = seq_file_net(seq);
2735
2736 state->idev = NULL;
2737 state->im = NULL;
2738 for_each_netdev_rcu(net, state->dev) {
2739 struct inet6_dev *idev;
2740 idev = __in6_dev_get(state->dev);
2741 if (unlikely(idev == NULL))
2742 continue;
2743 read_lock_bh(&idev->lock);
2744 im = idev->mc_list;
2745 if (likely(im)) {
2746 spin_lock_bh(&im->mca_lock);
2747 psf = im->mca_sources;
2748 if (likely(psf)) {
2749 state->im = im;
2750 state->idev = idev;
2751 break;
2752 }
2753 spin_unlock_bh(&im->mca_lock);
2754 }
2755 read_unlock_bh(&idev->lock);
2756 }
2757 return psf;
2758 }
2759
2760 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2761 {
2762 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2763
2764 psf = psf->sf_next;
2765 while (!psf) {
2766 spin_unlock_bh(&state->im->mca_lock);
2767 state->im = state->im->next;
2768 while (!state->im) {
2769 if (likely(state->idev))
2770 read_unlock_bh(&state->idev->lock);
2771
2772 state->dev = next_net_device_rcu(state->dev);
2773 if (!state->dev) {
2774 state->idev = NULL;
2775 goto out;
2776 }
2777 state->idev = __in6_dev_get(state->dev);
2778 if (!state->idev)
2779 continue;
2780 read_lock_bh(&state->idev->lock);
2781 state->im = state->idev->mc_list;
2782 }
2783 if (!state->im)
2784 break;
2785 spin_lock_bh(&state->im->mca_lock);
2786 psf = state->im->mca_sources;
2787 }
2788 out:
2789 return psf;
2790 }
2791
2792 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2793 {
2794 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2795 if (psf)
2796 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2797 --pos;
2798 return pos ? NULL : psf;
2799 }
2800
2801 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2802 __acquires(RCU)
2803 {
2804 rcu_read_lock();
2805 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2806 }
2807
2808 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2809 {
2810 struct ip6_sf_list *psf;
2811 if (v == SEQ_START_TOKEN)
2812 psf = igmp6_mcf_get_first(seq);
2813 else
2814 psf = igmp6_mcf_get_next(seq, v);
2815 ++*pos;
2816 return psf;
2817 }
2818
2819 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2820 __releases(RCU)
2821 {
2822 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2823 if (likely(state->im)) {
2824 spin_unlock_bh(&state->im->mca_lock);
2825 state->im = NULL;
2826 }
2827 if (likely(state->idev)) {
2828 read_unlock_bh(&state->idev->lock);
2829 state->idev = NULL;
2830 }
2831 state->dev = NULL;
2832 rcu_read_unlock();
2833 }
2834
2835 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2836 {
2837 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2838 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2839
2840 if (v == SEQ_START_TOKEN) {
2841 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2842 } else {
2843 seq_printf(seq,
2844 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2845 state->dev->ifindex, state->dev->name,
2846 &state->im->mca_addr,
2847 &psf->sf_addr,
2848 psf->sf_count[MCAST_INCLUDE],
2849 psf->sf_count[MCAST_EXCLUDE]);
2850 }
2851 return 0;
2852 }
2853
2854 static const struct seq_operations igmp6_mcf_seq_ops = {
2855 .start = igmp6_mcf_seq_start,
2856 .next = igmp6_mcf_seq_next,
2857 .stop = igmp6_mcf_seq_stop,
2858 .show = igmp6_mcf_seq_show,
2859 };
2860
2861 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2862 {
2863 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2864 sizeof(struct igmp6_mcf_iter_state));
2865 }
2866
2867 static const struct file_operations igmp6_mcf_seq_fops = {
2868 .owner = THIS_MODULE,
2869 .open = igmp6_mcf_seq_open,
2870 .read = seq_read,
2871 .llseek = seq_lseek,
2872 .release = seq_release_net,
2873 };
2874
2875 static int __net_init igmp6_proc_init(struct net *net)
2876 {
2877 int err;
2878
2879 err = -ENOMEM;
2880 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2881 goto out;
2882 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2883 &igmp6_mcf_seq_fops))
2884 goto out_proc_net_igmp6;
2885
2886 err = 0;
2887 out:
2888 return err;
2889
2890 out_proc_net_igmp6:
2891 remove_proc_entry("igmp6", net->proc_net);
2892 goto out;
2893 }
2894
2895 static void __net_exit igmp6_proc_exit(struct net *net)
2896 {
2897 remove_proc_entry("mcfilter6", net->proc_net);
2898 remove_proc_entry("igmp6", net->proc_net);
2899 }
2900 #else
2901 static inline int igmp6_proc_init(struct net *net)
2902 {
2903 return 0;
2904 }
2905 static inline void igmp6_proc_exit(struct net *net)
2906 {
2907 }
2908 #endif
2909
2910 static int __net_init igmp6_net_init(struct net *net)
2911 {
2912 int err;
2913
2914 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2915 SOCK_RAW, IPPROTO_ICMPV6, net);
2916 if (err < 0) {
2917 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2918 err);
2919 goto out;
2920 }
2921
2922 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2923
2924 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2925 SOCK_RAW, IPPROTO_ICMPV6, net);
2926 if (err < 0) {
2927 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2928 err);
2929 goto out_sock_create;
2930 }
2931
2932 err = igmp6_proc_init(net);
2933 if (err)
2934 goto out_sock_create_autojoin;
2935
2936 return 0;
2937
2938 out_sock_create_autojoin:
2939 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2940 out_sock_create:
2941 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2942 out:
2943 return err;
2944 }
2945
2946 static void __net_exit igmp6_net_exit(struct net *net)
2947 {
2948 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2949 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2950 igmp6_proc_exit(net);
2951 }
2952
2953 static struct pernet_operations igmp6_net_ops = {
2954 .init = igmp6_net_init,
2955 .exit = igmp6_net_exit,
2956 };
2957
2958 int __init igmp6_init(void)
2959 {
2960 return register_pernet_subsys(&igmp6_net_ops);
2961 }
2962
2963 void igmp6_cleanup(void)
2964 {
2965 unregister_pernet_subsys(&igmp6_net_ops);
2966 }
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