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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[mirror_ubuntu-focal-kernel.git] / net / ipv6 / mcast.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Multicast support for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
10 */
11
12 /* Changes:
13 *
14 * yoshfuji : fix format of router-alert option
15 * YOSHIFUJI Hideaki @USAGI:
16 * Fixed source address for MLD message based on
17 * <draft-ietf-magma-mld-source-05.txt>.
18 * YOSHIFUJI Hideaki @USAGI:
19 * - Ignore Queries for invalid addresses.
20 * - MLD for link-local addresses.
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - MLDv2 support
23 */
24
25 #include <linux/module.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/string.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/jiffies.h>
32 #include <linux/times.h>
33 #include <linux/net.h>
34 #include <linux/in.h>
35 #include <linux/in6.h>
36 #include <linux/netdevice.h>
37 #include <linux/if_arp.h>
38 #include <linux/route.h>
39 #include <linux/init.h>
40 #include <linux/proc_fs.h>
41 #include <linux/seq_file.h>
42 #include <linux/slab.h>
43 #include <linux/pkt_sched.h>
44 #include <net/mld.h>
45
46 #include <linux/netfilter.h>
47 #include <linux/netfilter_ipv6.h>
48
49 #include <net/net_namespace.h>
50 #include <net/sock.h>
51 #include <net/snmp.h>
52
53 #include <net/ipv6.h>
54 #include <net/protocol.h>
55 #include <net/if_inet6.h>
56 #include <net/ndisc.h>
57 #include <net/addrconf.h>
58 #include <net/ip6_route.h>
59 #include <net/inet_common.h>
60
61 #include <net/ip6_checksum.h>
62
63 /* Ensure that we have struct in6_addr aligned on 32bit word. */
64 static int __mld2_query_bugs[] __attribute__((__unused__)) = {
65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
68 };
69
70 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
71
72 static void igmp6_join_group(struct ifmcaddr6 *ma);
73 static void igmp6_leave_group(struct ifmcaddr6 *ma);
74 static void igmp6_timer_handler(struct timer_list *t);
75
76 static void mld_gq_timer_expire(struct timer_list *t);
77 static void mld_ifc_timer_expire(struct timer_list *t);
78 static void mld_ifc_event(struct inet6_dev *idev);
79 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
80 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
81 static void mld_clear_delrec(struct inet6_dev *idev);
82 static bool mld_in_v1_mode(const struct inet6_dev *idev);
83 static int sf_setstate(struct ifmcaddr6 *pmc);
84 static void sf_markstate(struct ifmcaddr6 *pmc);
85 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
86 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
87 int sfmode, int sfcount, const struct in6_addr *psfsrc,
88 int delta);
89 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
90 int sfmode, int sfcount, const struct in6_addr *psfsrc,
91 int delta);
92 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
93 struct inet6_dev *idev);
94 static int __ipv6_dev_mc_inc(struct net_device *dev,
95 const struct in6_addr *addr, unsigned int mode);
96
97 #define MLD_QRV_DEFAULT 2
98 /* RFC3810, 9.2. Query Interval */
99 #define MLD_QI_DEFAULT (125 * HZ)
100 /* RFC3810, 9.3. Query Response Interval */
101 #define MLD_QRI_DEFAULT (10 * HZ)
102
103 /* RFC3810, 8.1 Query Version Distinctions */
104 #define MLD_V1_QUERY_LEN 24
105 #define MLD_V2_QUERY_LEN_MIN 28
106
107 #define IPV6_MLD_MAX_MSF 64
108
109 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
110 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
111
112 /*
113 * socket join on multicast group
114 */
115
116 #define for_each_pmc_rcu(np, pmc) \
117 for (pmc = rcu_dereference(np->ipv6_mc_list); \
118 pmc != NULL; \
119 pmc = rcu_dereference(pmc->next))
120
121 static int unsolicited_report_interval(struct inet6_dev *idev)
122 {
123 int iv;
124
125 if (mld_in_v1_mode(idev))
126 iv = idev->cnf.mldv1_unsolicited_report_interval;
127 else
128 iv = idev->cnf.mldv2_unsolicited_report_interval;
129
130 return iv > 0 ? iv : 1;
131 }
132
133 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
134 const struct in6_addr *addr, unsigned int mode)
135 {
136 struct net_device *dev = NULL;
137 struct ipv6_mc_socklist *mc_lst;
138 struct ipv6_pinfo *np = inet6_sk(sk);
139 struct net *net = sock_net(sk);
140 int err;
141
142 ASSERT_RTNL();
143
144 if (!ipv6_addr_is_multicast(addr))
145 return -EINVAL;
146
147 rcu_read_lock();
148 for_each_pmc_rcu(np, mc_lst) {
149 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
150 ipv6_addr_equal(&mc_lst->addr, addr)) {
151 rcu_read_unlock();
152 return -EADDRINUSE;
153 }
154 }
155 rcu_read_unlock();
156
157 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
158
159 if (!mc_lst)
160 return -ENOMEM;
161
162 mc_lst->next = NULL;
163 mc_lst->addr = *addr;
164
165 if (ifindex == 0) {
166 struct rt6_info *rt;
167 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
168 if (rt) {
169 dev = rt->dst.dev;
170 ip6_rt_put(rt);
171 }
172 } else
173 dev = __dev_get_by_index(net, ifindex);
174
175 if (!dev) {
176 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
177 return -ENODEV;
178 }
179
180 mc_lst->ifindex = dev->ifindex;
181 mc_lst->sfmode = mode;
182 rwlock_init(&mc_lst->sflock);
183 mc_lst->sflist = NULL;
184
185 /*
186 * now add/increase the group membership on the device
187 */
188
189 err = __ipv6_dev_mc_inc(dev, addr, mode);
190
191 if (err) {
192 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
193 return err;
194 }
195
196 mc_lst->next = np->ipv6_mc_list;
197 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
198
199 return 0;
200 }
201
202 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
203 {
204 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
205 }
206 EXPORT_SYMBOL(ipv6_sock_mc_join);
207
208 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
209 const struct in6_addr *addr, unsigned int mode)
210 {
211 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
212 }
213
214 /*
215 * socket leave on multicast group
216 */
217 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
218 {
219 struct ipv6_pinfo *np = inet6_sk(sk);
220 struct ipv6_mc_socklist *mc_lst;
221 struct ipv6_mc_socklist __rcu **lnk;
222 struct net *net = sock_net(sk);
223
224 ASSERT_RTNL();
225
226 if (!ipv6_addr_is_multicast(addr))
227 return -EINVAL;
228
229 for (lnk = &np->ipv6_mc_list;
230 (mc_lst = rtnl_dereference(*lnk)) != NULL;
231 lnk = &mc_lst->next) {
232 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
233 ipv6_addr_equal(&mc_lst->addr, addr)) {
234 struct net_device *dev;
235
236 *lnk = mc_lst->next;
237
238 dev = __dev_get_by_index(net, mc_lst->ifindex);
239 if (dev) {
240 struct inet6_dev *idev = __in6_dev_get(dev);
241
242 (void) ip6_mc_leave_src(sk, mc_lst, idev);
243 if (idev)
244 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
245 } else
246 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
247
248 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
249 kfree_rcu(mc_lst, rcu);
250 return 0;
251 }
252 }
253
254 return -EADDRNOTAVAIL;
255 }
256 EXPORT_SYMBOL(ipv6_sock_mc_drop);
257
258 /* called with rcu_read_lock() */
259 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
260 const struct in6_addr *group,
261 int ifindex)
262 {
263 struct net_device *dev = NULL;
264 struct inet6_dev *idev = NULL;
265
266 if (ifindex == 0) {
267 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
268
269 if (rt) {
270 dev = rt->dst.dev;
271 ip6_rt_put(rt);
272 }
273 } else
274 dev = dev_get_by_index_rcu(net, ifindex);
275
276 if (!dev)
277 return NULL;
278 idev = __in6_dev_get(dev);
279 if (!idev)
280 return NULL;
281 read_lock_bh(&idev->lock);
282 if (idev->dead) {
283 read_unlock_bh(&idev->lock);
284 return NULL;
285 }
286 return idev;
287 }
288
289 void __ipv6_sock_mc_close(struct sock *sk)
290 {
291 struct ipv6_pinfo *np = inet6_sk(sk);
292 struct ipv6_mc_socklist *mc_lst;
293 struct net *net = sock_net(sk);
294
295 ASSERT_RTNL();
296
297 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
298 struct net_device *dev;
299
300 np->ipv6_mc_list = mc_lst->next;
301
302 dev = __dev_get_by_index(net, mc_lst->ifindex);
303 if (dev) {
304 struct inet6_dev *idev = __in6_dev_get(dev);
305
306 (void) ip6_mc_leave_src(sk, mc_lst, idev);
307 if (idev)
308 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
309 } else
310 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
311
312 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
313 kfree_rcu(mc_lst, rcu);
314 }
315 }
316
317 void ipv6_sock_mc_close(struct sock *sk)
318 {
319 struct ipv6_pinfo *np = inet6_sk(sk);
320
321 if (!rcu_access_pointer(np->ipv6_mc_list))
322 return;
323 rtnl_lock();
324 __ipv6_sock_mc_close(sk);
325 rtnl_unlock();
326 }
327
328 int ip6_mc_source(int add, int omode, struct sock *sk,
329 struct group_source_req *pgsr)
330 {
331 struct in6_addr *source, *group;
332 struct ipv6_mc_socklist *pmc;
333 struct inet6_dev *idev;
334 struct ipv6_pinfo *inet6 = inet6_sk(sk);
335 struct ip6_sf_socklist *psl;
336 struct net *net = sock_net(sk);
337 int i, j, rv;
338 int leavegroup = 0;
339 int pmclocked = 0;
340 int err;
341
342 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
343 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
344
345 if (!ipv6_addr_is_multicast(group))
346 return -EINVAL;
347
348 rcu_read_lock();
349 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
350 if (!idev) {
351 rcu_read_unlock();
352 return -ENODEV;
353 }
354
355 err = -EADDRNOTAVAIL;
356
357 for_each_pmc_rcu(inet6, pmc) {
358 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
359 continue;
360 if (ipv6_addr_equal(&pmc->addr, group))
361 break;
362 }
363 if (!pmc) { /* must have a prior join */
364 err = -EINVAL;
365 goto done;
366 }
367 /* if a source filter was set, must be the same mode as before */
368 if (pmc->sflist) {
369 if (pmc->sfmode != omode) {
370 err = -EINVAL;
371 goto done;
372 }
373 } else if (pmc->sfmode != omode) {
374 /* allow mode switches for empty-set filters */
375 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
376 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
377 pmc->sfmode = omode;
378 }
379
380 write_lock(&pmc->sflock);
381 pmclocked = 1;
382
383 psl = pmc->sflist;
384 if (!add) {
385 if (!psl)
386 goto done; /* err = -EADDRNOTAVAIL */
387 rv = !0;
388 for (i = 0; i < psl->sl_count; i++) {
389 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
390 if (rv == 0)
391 break;
392 }
393 if (rv) /* source not found */
394 goto done; /* err = -EADDRNOTAVAIL */
395
396 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
397 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
398 leavegroup = 1;
399 goto done;
400 }
401
402 /* update the interface filter */
403 ip6_mc_del_src(idev, group, omode, 1, source, 1);
404
405 for (j = i+1; j < psl->sl_count; j++)
406 psl->sl_addr[j-1] = psl->sl_addr[j];
407 psl->sl_count--;
408 err = 0;
409 goto done;
410 }
411 /* else, add a new source to the filter */
412
413 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
414 err = -ENOBUFS;
415 goto done;
416 }
417 if (!psl || psl->sl_count == psl->sl_max) {
418 struct ip6_sf_socklist *newpsl;
419 int count = IP6_SFBLOCK;
420
421 if (psl)
422 count += psl->sl_max;
423 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
424 if (!newpsl) {
425 err = -ENOBUFS;
426 goto done;
427 }
428 newpsl->sl_max = count;
429 newpsl->sl_count = count - IP6_SFBLOCK;
430 if (psl) {
431 for (i = 0; i < psl->sl_count; i++)
432 newpsl->sl_addr[i] = psl->sl_addr[i];
433 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
434 }
435 pmc->sflist = psl = newpsl;
436 }
437 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
438 for (i = 0; i < psl->sl_count; i++) {
439 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
440 if (rv == 0) /* There is an error in the address. */
441 goto done;
442 }
443 for (j = psl->sl_count-1; j >= i; j--)
444 psl->sl_addr[j+1] = psl->sl_addr[j];
445 psl->sl_addr[i] = *source;
446 psl->sl_count++;
447 err = 0;
448 /* update the interface list */
449 ip6_mc_add_src(idev, group, omode, 1, source, 1);
450 done:
451 if (pmclocked)
452 write_unlock(&pmc->sflock);
453 read_unlock_bh(&idev->lock);
454 rcu_read_unlock();
455 if (leavegroup)
456 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
457 return err;
458 }
459
460 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
461 {
462 const struct in6_addr *group;
463 struct ipv6_mc_socklist *pmc;
464 struct inet6_dev *idev;
465 struct ipv6_pinfo *inet6 = inet6_sk(sk);
466 struct ip6_sf_socklist *newpsl, *psl;
467 struct net *net = sock_net(sk);
468 int leavegroup = 0;
469 int i, err;
470
471 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
472
473 if (!ipv6_addr_is_multicast(group))
474 return -EINVAL;
475 if (gsf->gf_fmode != MCAST_INCLUDE &&
476 gsf->gf_fmode != MCAST_EXCLUDE)
477 return -EINVAL;
478
479 rcu_read_lock();
480 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
481
482 if (!idev) {
483 rcu_read_unlock();
484 return -ENODEV;
485 }
486
487 err = 0;
488
489 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
490 leavegroup = 1;
491 goto done;
492 }
493
494 for_each_pmc_rcu(inet6, pmc) {
495 if (pmc->ifindex != gsf->gf_interface)
496 continue;
497 if (ipv6_addr_equal(&pmc->addr, group))
498 break;
499 }
500 if (!pmc) { /* must have a prior join */
501 err = -EINVAL;
502 goto done;
503 }
504 if (gsf->gf_numsrc) {
505 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
506 GFP_ATOMIC);
507 if (!newpsl) {
508 err = -ENOBUFS;
509 goto done;
510 }
511 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
512 for (i = 0; i < newpsl->sl_count; ++i) {
513 struct sockaddr_in6 *psin6;
514
515 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
516 newpsl->sl_addr[i] = psin6->sin6_addr;
517 }
518 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
519 newpsl->sl_count, newpsl->sl_addr, 0);
520 if (err) {
521 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
522 goto done;
523 }
524 } else {
525 newpsl = NULL;
526 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
527 }
528
529 write_lock(&pmc->sflock);
530 psl = pmc->sflist;
531 if (psl) {
532 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
533 psl->sl_count, psl->sl_addr, 0);
534 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
535 } else
536 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
537 pmc->sflist = newpsl;
538 pmc->sfmode = gsf->gf_fmode;
539 write_unlock(&pmc->sflock);
540 err = 0;
541 done:
542 read_unlock_bh(&idev->lock);
543 rcu_read_unlock();
544 if (leavegroup)
545 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
546 return err;
547 }
548
549 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
550 struct group_filter __user *optval, int __user *optlen)
551 {
552 int err, i, count, copycount;
553 const struct in6_addr *group;
554 struct ipv6_mc_socklist *pmc;
555 struct inet6_dev *idev;
556 struct ipv6_pinfo *inet6 = inet6_sk(sk);
557 struct ip6_sf_socklist *psl;
558 struct net *net = sock_net(sk);
559
560 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
561
562 if (!ipv6_addr_is_multicast(group))
563 return -EINVAL;
564
565 rcu_read_lock();
566 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
567
568 if (!idev) {
569 rcu_read_unlock();
570 return -ENODEV;
571 }
572
573 err = -EADDRNOTAVAIL;
574 /* changes to the ipv6_mc_list require the socket lock and
575 * rtnl lock. We have the socket lock and rcu read lock,
576 * so reading the list is safe.
577 */
578
579 for_each_pmc_rcu(inet6, pmc) {
580 if (pmc->ifindex != gsf->gf_interface)
581 continue;
582 if (ipv6_addr_equal(group, &pmc->addr))
583 break;
584 }
585 if (!pmc) /* must have a prior join */
586 goto done;
587 gsf->gf_fmode = pmc->sfmode;
588 psl = pmc->sflist;
589 count = psl ? psl->sl_count : 0;
590 read_unlock_bh(&idev->lock);
591 rcu_read_unlock();
592
593 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
594 gsf->gf_numsrc = count;
595 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
596 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
597 return -EFAULT;
598 }
599 /* changes to psl require the socket lock, and a write lock
600 * on pmc->sflock. We have the socket lock so reading here is safe.
601 */
602 for (i = 0; i < copycount; i++) {
603 struct sockaddr_in6 *psin6;
604 struct sockaddr_storage ss;
605
606 psin6 = (struct sockaddr_in6 *)&ss;
607 memset(&ss, 0, sizeof(ss));
608 psin6->sin6_family = AF_INET6;
609 psin6->sin6_addr = psl->sl_addr[i];
610 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
611 return -EFAULT;
612 }
613 return 0;
614 done:
615 read_unlock_bh(&idev->lock);
616 rcu_read_unlock();
617 return err;
618 }
619
620 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
621 const struct in6_addr *src_addr)
622 {
623 struct ipv6_pinfo *np = inet6_sk(sk);
624 struct ipv6_mc_socklist *mc;
625 struct ip6_sf_socklist *psl;
626 bool rv = true;
627
628 rcu_read_lock();
629 for_each_pmc_rcu(np, mc) {
630 if (ipv6_addr_equal(&mc->addr, mc_addr))
631 break;
632 }
633 if (!mc) {
634 rcu_read_unlock();
635 return np->mc_all;
636 }
637 read_lock(&mc->sflock);
638 psl = mc->sflist;
639 if (!psl) {
640 rv = mc->sfmode == MCAST_EXCLUDE;
641 } else {
642 int i;
643
644 for (i = 0; i < psl->sl_count; i++) {
645 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
646 break;
647 }
648 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
649 rv = false;
650 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
651 rv = false;
652 }
653 read_unlock(&mc->sflock);
654 rcu_read_unlock();
655
656 return rv;
657 }
658
659 static void igmp6_group_added(struct ifmcaddr6 *mc)
660 {
661 struct net_device *dev = mc->idev->dev;
662 char buf[MAX_ADDR_LEN];
663
664 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
665 IPV6_ADDR_SCOPE_LINKLOCAL)
666 return;
667
668 spin_lock_bh(&mc->mca_lock);
669 if (!(mc->mca_flags&MAF_LOADED)) {
670 mc->mca_flags |= MAF_LOADED;
671 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
672 dev_mc_add(dev, buf);
673 }
674 spin_unlock_bh(&mc->mca_lock);
675
676 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
677 return;
678
679 if (mld_in_v1_mode(mc->idev)) {
680 igmp6_join_group(mc);
681 return;
682 }
683 /* else v2 */
684
685 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
686 * should not send filter-mode change record as the mode
687 * should be from IN() to IN(A).
688 */
689 if (mc->mca_sfmode == MCAST_EXCLUDE)
690 mc->mca_crcount = mc->idev->mc_qrv;
691
692 mld_ifc_event(mc->idev);
693 }
694
695 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
696 {
697 struct net_device *dev = mc->idev->dev;
698 char buf[MAX_ADDR_LEN];
699
700 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
701 IPV6_ADDR_SCOPE_LINKLOCAL)
702 return;
703
704 spin_lock_bh(&mc->mca_lock);
705 if (mc->mca_flags&MAF_LOADED) {
706 mc->mca_flags &= ~MAF_LOADED;
707 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
708 dev_mc_del(dev, buf);
709 }
710
711 spin_unlock_bh(&mc->mca_lock);
712 if (mc->mca_flags & MAF_NOREPORT)
713 return;
714
715 if (!mc->idev->dead)
716 igmp6_leave_group(mc);
717
718 spin_lock_bh(&mc->mca_lock);
719 if (del_timer(&mc->mca_timer))
720 refcount_dec(&mc->mca_refcnt);
721 spin_unlock_bh(&mc->mca_lock);
722 }
723
724 /*
725 * deleted ifmcaddr6 manipulation
726 */
727 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
728 {
729 struct ifmcaddr6 *pmc;
730
731 /* this is an "ifmcaddr6" for convenience; only the fields below
732 * are actually used. In particular, the refcnt and users are not
733 * used for management of the delete list. Using the same structure
734 * for deleted items allows change reports to use common code with
735 * non-deleted or query-response MCA's.
736 */
737 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
738 if (!pmc)
739 return;
740
741 spin_lock_bh(&im->mca_lock);
742 spin_lock_init(&pmc->mca_lock);
743 pmc->idev = im->idev;
744 in6_dev_hold(idev);
745 pmc->mca_addr = im->mca_addr;
746 pmc->mca_crcount = idev->mc_qrv;
747 pmc->mca_sfmode = im->mca_sfmode;
748 if (pmc->mca_sfmode == MCAST_INCLUDE) {
749 struct ip6_sf_list *psf;
750
751 pmc->mca_tomb = im->mca_tomb;
752 pmc->mca_sources = im->mca_sources;
753 im->mca_tomb = im->mca_sources = NULL;
754 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
755 psf->sf_crcount = pmc->mca_crcount;
756 }
757 spin_unlock_bh(&im->mca_lock);
758
759 spin_lock_bh(&idev->mc_lock);
760 pmc->next = idev->mc_tomb;
761 idev->mc_tomb = pmc;
762 spin_unlock_bh(&idev->mc_lock);
763 }
764
765 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
766 {
767 struct ifmcaddr6 *pmc, *pmc_prev;
768 struct ip6_sf_list *psf;
769 struct in6_addr *pmca = &im->mca_addr;
770
771 spin_lock_bh(&idev->mc_lock);
772 pmc_prev = NULL;
773 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
774 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
775 break;
776 pmc_prev = pmc;
777 }
778 if (pmc) {
779 if (pmc_prev)
780 pmc_prev->next = pmc->next;
781 else
782 idev->mc_tomb = pmc->next;
783 }
784 spin_unlock_bh(&idev->mc_lock);
785
786 spin_lock_bh(&im->mca_lock);
787 if (pmc) {
788 im->idev = pmc->idev;
789 if (im->mca_sfmode == MCAST_INCLUDE) {
790 im->mca_tomb = pmc->mca_tomb;
791 im->mca_sources = pmc->mca_sources;
792 for (psf = im->mca_sources; psf; psf = psf->sf_next)
793 psf->sf_crcount = idev->mc_qrv;
794 } else {
795 im->mca_crcount = idev->mc_qrv;
796 }
797 in6_dev_put(pmc->idev);
798 kfree(pmc);
799 }
800 spin_unlock_bh(&im->mca_lock);
801 }
802
803 static void mld_clear_delrec(struct inet6_dev *idev)
804 {
805 struct ifmcaddr6 *pmc, *nextpmc;
806
807 spin_lock_bh(&idev->mc_lock);
808 pmc = idev->mc_tomb;
809 idev->mc_tomb = NULL;
810 spin_unlock_bh(&idev->mc_lock);
811
812 for (; pmc; pmc = nextpmc) {
813 nextpmc = pmc->next;
814 ip6_mc_clear_src(pmc);
815 in6_dev_put(pmc->idev);
816 kfree(pmc);
817 }
818
819 /* clear dead sources, too */
820 read_lock_bh(&idev->lock);
821 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
822 struct ip6_sf_list *psf, *psf_next;
823
824 spin_lock_bh(&pmc->mca_lock);
825 psf = pmc->mca_tomb;
826 pmc->mca_tomb = NULL;
827 spin_unlock_bh(&pmc->mca_lock);
828 for (; psf; psf = psf_next) {
829 psf_next = psf->sf_next;
830 kfree(psf);
831 }
832 }
833 read_unlock_bh(&idev->lock);
834 }
835
836 static void mca_get(struct ifmcaddr6 *mc)
837 {
838 refcount_inc(&mc->mca_refcnt);
839 }
840
841 static void ma_put(struct ifmcaddr6 *mc)
842 {
843 if (refcount_dec_and_test(&mc->mca_refcnt)) {
844 in6_dev_put(mc->idev);
845 kfree(mc);
846 }
847 }
848
849 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
850 const struct in6_addr *addr,
851 unsigned int mode)
852 {
853 struct ifmcaddr6 *mc;
854
855 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
856 if (!mc)
857 return NULL;
858
859 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
860
861 mc->mca_addr = *addr;
862 mc->idev = idev; /* reference taken by caller */
863 mc->mca_users = 1;
864 /* mca_stamp should be updated upon changes */
865 mc->mca_cstamp = mc->mca_tstamp = jiffies;
866 refcount_set(&mc->mca_refcnt, 1);
867 spin_lock_init(&mc->mca_lock);
868
869 mc->mca_sfmode = mode;
870 mc->mca_sfcount[mode] = 1;
871
872 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
873 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
874 mc->mca_flags |= MAF_NOREPORT;
875
876 return mc;
877 }
878
879 /*
880 * device multicast group inc (add if not found)
881 */
882 static int __ipv6_dev_mc_inc(struct net_device *dev,
883 const struct in6_addr *addr, unsigned int mode)
884 {
885 struct ifmcaddr6 *mc;
886 struct inet6_dev *idev;
887
888 ASSERT_RTNL();
889
890 /* we need to take a reference on idev */
891 idev = in6_dev_get(dev);
892
893 if (!idev)
894 return -EINVAL;
895
896 write_lock_bh(&idev->lock);
897 if (idev->dead) {
898 write_unlock_bh(&idev->lock);
899 in6_dev_put(idev);
900 return -ENODEV;
901 }
902
903 for (mc = idev->mc_list; mc; mc = mc->next) {
904 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
905 mc->mca_users++;
906 write_unlock_bh(&idev->lock);
907 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
908 in6_dev_put(idev);
909 return 0;
910 }
911 }
912
913 mc = mca_alloc(idev, addr, mode);
914 if (!mc) {
915 write_unlock_bh(&idev->lock);
916 in6_dev_put(idev);
917 return -ENOMEM;
918 }
919
920 mc->next = idev->mc_list;
921 idev->mc_list = mc;
922
923 /* Hold this for the code below before we unlock,
924 * it is already exposed via idev->mc_list.
925 */
926 mca_get(mc);
927 write_unlock_bh(&idev->lock);
928
929 mld_del_delrec(idev, mc);
930 igmp6_group_added(mc);
931 ma_put(mc);
932 return 0;
933 }
934
935 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
936 {
937 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
938 }
939 EXPORT_SYMBOL(ipv6_dev_mc_inc);
940
941 /*
942 * device multicast group del
943 */
944 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
945 {
946 struct ifmcaddr6 *ma, **map;
947
948 ASSERT_RTNL();
949
950 write_lock_bh(&idev->lock);
951 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
952 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
953 if (--ma->mca_users == 0) {
954 *map = ma->next;
955 write_unlock_bh(&idev->lock);
956
957 igmp6_group_dropped(ma);
958 ip6_mc_clear_src(ma);
959
960 ma_put(ma);
961 return 0;
962 }
963 write_unlock_bh(&idev->lock);
964 return 0;
965 }
966 }
967 write_unlock_bh(&idev->lock);
968
969 return -ENOENT;
970 }
971
972 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
973 {
974 struct inet6_dev *idev;
975 int err;
976
977 ASSERT_RTNL();
978
979 idev = __in6_dev_get(dev);
980 if (!idev)
981 err = -ENODEV;
982 else
983 err = __ipv6_dev_mc_dec(idev, addr);
984
985 return err;
986 }
987 EXPORT_SYMBOL(ipv6_dev_mc_dec);
988
989 /*
990 * check if the interface/address pair is valid
991 */
992 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
993 const struct in6_addr *src_addr)
994 {
995 struct inet6_dev *idev;
996 struct ifmcaddr6 *mc;
997 bool rv = false;
998
999 rcu_read_lock();
1000 idev = __in6_dev_get(dev);
1001 if (idev) {
1002 read_lock_bh(&idev->lock);
1003 for (mc = idev->mc_list; mc; mc = mc->next) {
1004 if (ipv6_addr_equal(&mc->mca_addr, group))
1005 break;
1006 }
1007 if (mc) {
1008 if (src_addr && !ipv6_addr_any(src_addr)) {
1009 struct ip6_sf_list *psf;
1010
1011 spin_lock_bh(&mc->mca_lock);
1012 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1013 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1014 break;
1015 }
1016 if (psf)
1017 rv = psf->sf_count[MCAST_INCLUDE] ||
1018 psf->sf_count[MCAST_EXCLUDE] !=
1019 mc->mca_sfcount[MCAST_EXCLUDE];
1020 else
1021 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1022 spin_unlock_bh(&mc->mca_lock);
1023 } else
1024 rv = true; /* don't filter unspecified source */
1025 }
1026 read_unlock_bh(&idev->lock);
1027 }
1028 rcu_read_unlock();
1029 return rv;
1030 }
1031
1032 static void mld_gq_start_timer(struct inet6_dev *idev)
1033 {
1034 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1035
1036 idev->mc_gq_running = 1;
1037 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1038 in6_dev_hold(idev);
1039 }
1040
1041 static void mld_gq_stop_timer(struct inet6_dev *idev)
1042 {
1043 idev->mc_gq_running = 0;
1044 if (del_timer(&idev->mc_gq_timer))
1045 __in6_dev_put(idev);
1046 }
1047
1048 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1049 {
1050 unsigned long tv = prandom_u32() % delay;
1051
1052 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1053 in6_dev_hold(idev);
1054 }
1055
1056 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1057 {
1058 idev->mc_ifc_count = 0;
1059 if (del_timer(&idev->mc_ifc_timer))
1060 __in6_dev_put(idev);
1061 }
1062
1063 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1064 {
1065 unsigned long tv = prandom_u32() % delay;
1066
1067 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1068 in6_dev_hold(idev);
1069 }
1070
1071 static void mld_dad_stop_timer(struct inet6_dev *idev)
1072 {
1073 if (del_timer(&idev->mc_dad_timer))
1074 __in6_dev_put(idev);
1075 }
1076
1077 /*
1078 * IGMP handling (alias multicast ICMPv6 messages)
1079 */
1080
1081 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1082 {
1083 unsigned long delay = resptime;
1084
1085 /* Do not start timer for these addresses */
1086 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1087 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1088 return;
1089
1090 if (del_timer(&ma->mca_timer)) {
1091 refcount_dec(&ma->mca_refcnt);
1092 delay = ma->mca_timer.expires - jiffies;
1093 }
1094
1095 if (delay >= resptime)
1096 delay = prandom_u32() % resptime;
1097
1098 ma->mca_timer.expires = jiffies + delay;
1099 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1100 refcount_inc(&ma->mca_refcnt);
1101 ma->mca_flags |= MAF_TIMER_RUNNING;
1102 }
1103
1104 /* mark EXCLUDE-mode sources */
1105 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1106 const struct in6_addr *srcs)
1107 {
1108 struct ip6_sf_list *psf;
1109 int i, scount;
1110
1111 scount = 0;
1112 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1113 if (scount == nsrcs)
1114 break;
1115 for (i = 0; i < nsrcs; i++) {
1116 /* skip inactive filters */
1117 if (psf->sf_count[MCAST_INCLUDE] ||
1118 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1119 psf->sf_count[MCAST_EXCLUDE])
1120 break;
1121 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1122 scount++;
1123 break;
1124 }
1125 }
1126 }
1127 pmc->mca_flags &= ~MAF_GSQUERY;
1128 if (scount == nsrcs) /* all sources excluded */
1129 return false;
1130 return true;
1131 }
1132
1133 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1134 const struct in6_addr *srcs)
1135 {
1136 struct ip6_sf_list *psf;
1137 int i, scount;
1138
1139 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1140 return mld_xmarksources(pmc, nsrcs, srcs);
1141
1142 /* mark INCLUDE-mode sources */
1143
1144 scount = 0;
1145 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1146 if (scount == nsrcs)
1147 break;
1148 for (i = 0; i < nsrcs; i++) {
1149 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1150 psf->sf_gsresp = 1;
1151 scount++;
1152 break;
1153 }
1154 }
1155 }
1156 if (!scount) {
1157 pmc->mca_flags &= ~MAF_GSQUERY;
1158 return false;
1159 }
1160 pmc->mca_flags |= MAF_GSQUERY;
1161 return true;
1162 }
1163
1164 static int mld_force_mld_version(const struct inet6_dev *idev)
1165 {
1166 /* Normally, both are 0 here. If enforcement to a particular is
1167 * being used, individual device enforcement will have a lower
1168 * precedence over 'all' device (.../conf/all/force_mld_version).
1169 */
1170
1171 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1172 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1173 else
1174 return idev->cnf.force_mld_version;
1175 }
1176
1177 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1178 {
1179 return mld_force_mld_version(idev) == 2;
1180 }
1181
1182 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1183 {
1184 return mld_force_mld_version(idev) == 1;
1185 }
1186
1187 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1188 {
1189 if (mld_in_v2_mode_only(idev))
1190 return false;
1191 if (mld_in_v1_mode_only(idev))
1192 return true;
1193 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1194 return true;
1195
1196 return false;
1197 }
1198
1199 static void mld_set_v1_mode(struct inet6_dev *idev)
1200 {
1201 /* RFC3810, relevant sections:
1202 * - 9.1. Robustness Variable
1203 * - 9.2. Query Interval
1204 * - 9.3. Query Response Interval
1205 * - 9.12. Older Version Querier Present Timeout
1206 */
1207 unsigned long switchback;
1208
1209 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1210
1211 idev->mc_v1_seen = jiffies + switchback;
1212 }
1213
1214 static void mld_update_qrv(struct inet6_dev *idev,
1215 const struct mld2_query *mlh2)
1216 {
1217 /* RFC3810, relevant sections:
1218 * - 5.1.8. QRV (Querier's Robustness Variable)
1219 * - 9.1. Robustness Variable
1220 */
1221
1222 /* The value of the Robustness Variable MUST NOT be zero,
1223 * and SHOULD NOT be one. Catch this here if we ever run
1224 * into such a case in future.
1225 */
1226 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1227 WARN_ON(idev->mc_qrv == 0);
1228
1229 if (mlh2->mld2q_qrv > 0)
1230 idev->mc_qrv = mlh2->mld2q_qrv;
1231
1232 if (unlikely(idev->mc_qrv < min_qrv)) {
1233 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1234 idev->mc_qrv, min_qrv);
1235 idev->mc_qrv = min_qrv;
1236 }
1237 }
1238
1239 static void mld_update_qi(struct inet6_dev *idev,
1240 const struct mld2_query *mlh2)
1241 {
1242 /* RFC3810, relevant sections:
1243 * - 5.1.9. QQIC (Querier's Query Interval Code)
1244 * - 9.2. Query Interval
1245 * - 9.12. Older Version Querier Present Timeout
1246 * (the [Query Interval] in the last Query received)
1247 */
1248 unsigned long mc_qqi;
1249
1250 if (mlh2->mld2q_qqic < 128) {
1251 mc_qqi = mlh2->mld2q_qqic;
1252 } else {
1253 unsigned long mc_man, mc_exp;
1254
1255 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1256 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1257
1258 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1259 }
1260
1261 idev->mc_qi = mc_qqi * HZ;
1262 }
1263
1264 static void mld_update_qri(struct inet6_dev *idev,
1265 const struct mld2_query *mlh2)
1266 {
1267 /* RFC3810, relevant sections:
1268 * - 5.1.3. Maximum Response Code
1269 * - 9.3. Query Response Interval
1270 */
1271 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1272 }
1273
1274 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1275 unsigned long *max_delay, bool v1_query)
1276 {
1277 unsigned long mldv1_md;
1278
1279 /* Ignore v1 queries */
1280 if (mld_in_v2_mode_only(idev))
1281 return -EINVAL;
1282
1283 mldv1_md = ntohs(mld->mld_maxdelay);
1284
1285 /* When in MLDv1 fallback and a MLDv2 router start-up being
1286 * unaware of current MLDv1 operation, the MRC == MRD mapping
1287 * only works when the exponential algorithm is not being
1288 * used (as MLDv1 is unaware of such things).
1289 *
1290 * According to the RFC author, the MLDv2 implementations
1291 * he's aware of all use a MRC < 32768 on start up queries.
1292 *
1293 * Thus, should we *ever* encounter something else larger
1294 * than that, just assume the maximum possible within our
1295 * reach.
1296 */
1297 if (!v1_query)
1298 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1299
1300 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1301
1302 /* MLDv1 router present: we need to go into v1 mode *only*
1303 * when an MLDv1 query is received as per section 9.12. of
1304 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1305 * queries MUST be of exactly 24 octets.
1306 */
1307 if (v1_query)
1308 mld_set_v1_mode(idev);
1309
1310 /* cancel MLDv2 report timer */
1311 mld_gq_stop_timer(idev);
1312 /* cancel the interface change timer */
1313 mld_ifc_stop_timer(idev);
1314 /* clear deleted report items */
1315 mld_clear_delrec(idev);
1316
1317 return 0;
1318 }
1319
1320 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1321 unsigned long *max_delay)
1322 {
1323 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1324
1325 mld_update_qrv(idev, mld);
1326 mld_update_qi(idev, mld);
1327 mld_update_qri(idev, mld);
1328
1329 idev->mc_maxdelay = *max_delay;
1330
1331 return 0;
1332 }
1333
1334 /* called with rcu_read_lock() */
1335 int igmp6_event_query(struct sk_buff *skb)
1336 {
1337 struct mld2_query *mlh2 = NULL;
1338 struct ifmcaddr6 *ma;
1339 const struct in6_addr *group;
1340 unsigned long max_delay;
1341 struct inet6_dev *idev;
1342 struct mld_msg *mld;
1343 int group_type;
1344 int mark = 0;
1345 int len, err;
1346
1347 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1348 return -EINVAL;
1349
1350 /* compute payload length excluding extension headers */
1351 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1352 len -= skb_network_header_len(skb);
1353
1354 /* RFC3810 6.2
1355 * Upon reception of an MLD message that contains a Query, the node
1356 * checks if the source address of the message is a valid link-local
1357 * address, if the Hop Limit is set to 1, and if the Router Alert
1358 * option is present in the Hop-By-Hop Options header of the IPv6
1359 * packet. If any of these checks fails, the packet is dropped.
1360 */
1361 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1362 ipv6_hdr(skb)->hop_limit != 1 ||
1363 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1364 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1365 return -EINVAL;
1366
1367 idev = __in6_dev_get(skb->dev);
1368 if (!idev)
1369 return 0;
1370
1371 mld = (struct mld_msg *)icmp6_hdr(skb);
1372 group = &mld->mld_mca;
1373 group_type = ipv6_addr_type(group);
1374
1375 if (group_type != IPV6_ADDR_ANY &&
1376 !(group_type&IPV6_ADDR_MULTICAST))
1377 return -EINVAL;
1378
1379 if (len < MLD_V1_QUERY_LEN) {
1380 return -EINVAL;
1381 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1382 err = mld_process_v1(idev, mld, &max_delay,
1383 len == MLD_V1_QUERY_LEN);
1384 if (err < 0)
1385 return err;
1386 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1387 int srcs_offset = sizeof(struct mld2_query) -
1388 sizeof(struct icmp6hdr);
1389
1390 if (!pskb_may_pull(skb, srcs_offset))
1391 return -EINVAL;
1392
1393 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1394
1395 err = mld_process_v2(idev, mlh2, &max_delay);
1396 if (err < 0)
1397 return err;
1398
1399 if (group_type == IPV6_ADDR_ANY) { /* general query */
1400 if (mlh2->mld2q_nsrcs)
1401 return -EINVAL; /* no sources allowed */
1402
1403 mld_gq_start_timer(idev);
1404 return 0;
1405 }
1406 /* mark sources to include, if group & source-specific */
1407 if (mlh2->mld2q_nsrcs != 0) {
1408 if (!pskb_may_pull(skb, srcs_offset +
1409 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1410 return -EINVAL;
1411
1412 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1413 mark = 1;
1414 }
1415 } else {
1416 return -EINVAL;
1417 }
1418
1419 read_lock_bh(&idev->lock);
1420 if (group_type == IPV6_ADDR_ANY) {
1421 for (ma = idev->mc_list; ma; ma = ma->next) {
1422 spin_lock_bh(&ma->mca_lock);
1423 igmp6_group_queried(ma, max_delay);
1424 spin_unlock_bh(&ma->mca_lock);
1425 }
1426 } else {
1427 for (ma = idev->mc_list; ma; ma = ma->next) {
1428 if (!ipv6_addr_equal(group, &ma->mca_addr))
1429 continue;
1430 spin_lock_bh(&ma->mca_lock);
1431 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1432 /* gsquery <- gsquery && mark */
1433 if (!mark)
1434 ma->mca_flags &= ~MAF_GSQUERY;
1435 } else {
1436 /* gsquery <- mark */
1437 if (mark)
1438 ma->mca_flags |= MAF_GSQUERY;
1439 else
1440 ma->mca_flags &= ~MAF_GSQUERY;
1441 }
1442 if (!(ma->mca_flags & MAF_GSQUERY) ||
1443 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1444 igmp6_group_queried(ma, max_delay);
1445 spin_unlock_bh(&ma->mca_lock);
1446 break;
1447 }
1448 }
1449 read_unlock_bh(&idev->lock);
1450
1451 return 0;
1452 }
1453
1454 /* called with rcu_read_lock() */
1455 int igmp6_event_report(struct sk_buff *skb)
1456 {
1457 struct ifmcaddr6 *ma;
1458 struct inet6_dev *idev;
1459 struct mld_msg *mld;
1460 int addr_type;
1461
1462 /* Our own report looped back. Ignore it. */
1463 if (skb->pkt_type == PACKET_LOOPBACK)
1464 return 0;
1465
1466 /* send our report if the MC router may not have heard this report */
1467 if (skb->pkt_type != PACKET_MULTICAST &&
1468 skb->pkt_type != PACKET_BROADCAST)
1469 return 0;
1470
1471 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1472 return -EINVAL;
1473
1474 mld = (struct mld_msg *)icmp6_hdr(skb);
1475
1476 /* Drop reports with not link local source */
1477 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1478 if (addr_type != IPV6_ADDR_ANY &&
1479 !(addr_type&IPV6_ADDR_LINKLOCAL))
1480 return -EINVAL;
1481
1482 idev = __in6_dev_get(skb->dev);
1483 if (!idev)
1484 return -ENODEV;
1485
1486 /*
1487 * Cancel the timer for this group
1488 */
1489
1490 read_lock_bh(&idev->lock);
1491 for (ma = idev->mc_list; ma; ma = ma->next) {
1492 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1493 spin_lock(&ma->mca_lock);
1494 if (del_timer(&ma->mca_timer))
1495 refcount_dec(&ma->mca_refcnt);
1496 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1497 spin_unlock(&ma->mca_lock);
1498 break;
1499 }
1500 }
1501 read_unlock_bh(&idev->lock);
1502 return 0;
1503 }
1504
1505 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1506 int gdeleted, int sdeleted)
1507 {
1508 switch (type) {
1509 case MLD2_MODE_IS_INCLUDE:
1510 case MLD2_MODE_IS_EXCLUDE:
1511 if (gdeleted || sdeleted)
1512 return false;
1513 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1514 if (pmc->mca_sfmode == MCAST_INCLUDE)
1515 return true;
1516 /* don't include if this source is excluded
1517 * in all filters
1518 */
1519 if (psf->sf_count[MCAST_INCLUDE])
1520 return type == MLD2_MODE_IS_INCLUDE;
1521 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1522 psf->sf_count[MCAST_EXCLUDE];
1523 }
1524 return false;
1525 case MLD2_CHANGE_TO_INCLUDE:
1526 if (gdeleted || sdeleted)
1527 return false;
1528 return psf->sf_count[MCAST_INCLUDE] != 0;
1529 case MLD2_CHANGE_TO_EXCLUDE:
1530 if (gdeleted || sdeleted)
1531 return false;
1532 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1533 psf->sf_count[MCAST_INCLUDE])
1534 return false;
1535 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1536 psf->sf_count[MCAST_EXCLUDE];
1537 case MLD2_ALLOW_NEW_SOURCES:
1538 if (gdeleted || !psf->sf_crcount)
1539 return false;
1540 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1541 case MLD2_BLOCK_OLD_SOURCES:
1542 if (pmc->mca_sfmode == MCAST_INCLUDE)
1543 return gdeleted || (psf->sf_crcount && sdeleted);
1544 return psf->sf_crcount && !gdeleted && !sdeleted;
1545 }
1546 return false;
1547 }
1548
1549 static int
1550 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1551 {
1552 struct ip6_sf_list *psf;
1553 int scount = 0;
1554
1555 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1556 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1557 continue;
1558 scount++;
1559 }
1560 return scount;
1561 }
1562
1563 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1564 struct net_device *dev,
1565 const struct in6_addr *saddr,
1566 const struct in6_addr *daddr,
1567 int proto, int len)
1568 {
1569 struct ipv6hdr *hdr;
1570
1571 skb->protocol = htons(ETH_P_IPV6);
1572 skb->dev = dev;
1573
1574 skb_reset_network_header(skb);
1575 skb_put(skb, sizeof(struct ipv6hdr));
1576 hdr = ipv6_hdr(skb);
1577
1578 ip6_flow_hdr(hdr, 0, 0);
1579
1580 hdr->payload_len = htons(len);
1581 hdr->nexthdr = proto;
1582 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1583
1584 hdr->saddr = *saddr;
1585 hdr->daddr = *daddr;
1586 }
1587
1588 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1589 {
1590 struct net_device *dev = idev->dev;
1591 struct net *net = dev_net(dev);
1592 struct sock *sk = net->ipv6.igmp_sk;
1593 struct sk_buff *skb;
1594 struct mld2_report *pmr;
1595 struct in6_addr addr_buf;
1596 const struct in6_addr *saddr;
1597 int hlen = LL_RESERVED_SPACE(dev);
1598 int tlen = dev->needed_tailroom;
1599 unsigned int size = mtu + hlen + tlen;
1600 int err;
1601 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1602 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1603 IPV6_TLV_PADN, 0 };
1604
1605 /* we assume size > sizeof(ra) here */
1606 /* limit our allocations to order-0 page */
1607 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1608 skb = sock_alloc_send_skb(sk, size, 1, &err);
1609
1610 if (!skb)
1611 return NULL;
1612
1613 skb->priority = TC_PRIO_CONTROL;
1614 skb_reserve(skb, hlen);
1615 skb_tailroom_reserve(skb, mtu, tlen);
1616
1617 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1618 /* <draft-ietf-magma-mld-source-05.txt>:
1619 * use unspecified address as the source address
1620 * when a valid link-local address is not available.
1621 */
1622 saddr = &in6addr_any;
1623 } else
1624 saddr = &addr_buf;
1625
1626 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1627
1628 skb_put_data(skb, ra, sizeof(ra));
1629
1630 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1631 skb_put(skb, sizeof(*pmr));
1632 pmr = (struct mld2_report *)skb_transport_header(skb);
1633 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1634 pmr->mld2r_resv1 = 0;
1635 pmr->mld2r_cksum = 0;
1636 pmr->mld2r_resv2 = 0;
1637 pmr->mld2r_ngrec = 0;
1638 return skb;
1639 }
1640
1641 static void mld_sendpack(struct sk_buff *skb)
1642 {
1643 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1644 struct mld2_report *pmr =
1645 (struct mld2_report *)skb_transport_header(skb);
1646 int payload_len, mldlen;
1647 struct inet6_dev *idev;
1648 struct net *net = dev_net(skb->dev);
1649 int err;
1650 struct flowi6 fl6;
1651 struct dst_entry *dst;
1652
1653 rcu_read_lock();
1654 idev = __in6_dev_get(skb->dev);
1655 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1656
1657 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1658 sizeof(*pip6);
1659 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1660 pip6->payload_len = htons(payload_len);
1661
1662 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1663 IPPROTO_ICMPV6,
1664 csum_partial(skb_transport_header(skb),
1665 mldlen, 0));
1666
1667 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1668 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1669 skb->dev->ifindex);
1670 dst = icmp6_dst_alloc(skb->dev, &fl6);
1671
1672 err = 0;
1673 if (IS_ERR(dst)) {
1674 err = PTR_ERR(dst);
1675 dst = NULL;
1676 }
1677 skb_dst_set(skb, dst);
1678 if (err)
1679 goto err_out;
1680
1681 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1682 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1683 dst_output);
1684 out:
1685 if (!err) {
1686 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1687 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1688 } else {
1689 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1690 }
1691
1692 rcu_read_unlock();
1693 return;
1694
1695 err_out:
1696 kfree_skb(skb);
1697 goto out;
1698 }
1699
1700 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1701 {
1702 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1703 }
1704
1705 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1706 int type, struct mld2_grec **ppgr, unsigned int mtu)
1707 {
1708 struct mld2_report *pmr;
1709 struct mld2_grec *pgr;
1710
1711 if (!skb) {
1712 skb = mld_newpack(pmc->idev, mtu);
1713 if (!skb)
1714 return NULL;
1715 }
1716 pgr = skb_put(skb, sizeof(struct mld2_grec));
1717 pgr->grec_type = type;
1718 pgr->grec_auxwords = 0;
1719 pgr->grec_nsrcs = 0;
1720 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1721 pmr = (struct mld2_report *)skb_transport_header(skb);
1722 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1723 *ppgr = pgr;
1724 return skb;
1725 }
1726
1727 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1728
1729 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1730 int type, int gdeleted, int sdeleted, int crsend)
1731 {
1732 struct inet6_dev *idev = pmc->idev;
1733 struct net_device *dev = idev->dev;
1734 struct mld2_report *pmr;
1735 struct mld2_grec *pgr = NULL;
1736 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1737 int scount, stotal, first, isquery, truncate;
1738 unsigned int mtu;
1739
1740 if (pmc->mca_flags & MAF_NOREPORT)
1741 return skb;
1742
1743 mtu = READ_ONCE(dev->mtu);
1744 if (mtu < IPV6_MIN_MTU)
1745 return skb;
1746
1747 isquery = type == MLD2_MODE_IS_INCLUDE ||
1748 type == MLD2_MODE_IS_EXCLUDE;
1749 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1750 type == MLD2_CHANGE_TO_EXCLUDE;
1751
1752 stotal = scount = 0;
1753
1754 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1755
1756 if (!*psf_list)
1757 goto empty_source;
1758
1759 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1760
1761 /* EX and TO_EX get a fresh packet, if needed */
1762 if (truncate) {
1763 if (pmr && pmr->mld2r_ngrec &&
1764 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1765 if (skb)
1766 mld_sendpack(skb);
1767 skb = mld_newpack(idev, mtu);
1768 }
1769 }
1770 first = 1;
1771 psf_prev = NULL;
1772 for (psf = *psf_list; psf; psf = psf_next) {
1773 struct in6_addr *psrc;
1774
1775 psf_next = psf->sf_next;
1776
1777 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1778 psf_prev = psf;
1779 continue;
1780 }
1781
1782 /* Based on RFC3810 6.1. Should not send source-list change
1783 * records when there is a filter mode change.
1784 */
1785 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1786 (!gdeleted && pmc->mca_crcount)) &&
1787 (type == MLD2_ALLOW_NEW_SOURCES ||
1788 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1789 goto decrease_sf_crcount;
1790
1791 /* clear marks on query responses */
1792 if (isquery)
1793 psf->sf_gsresp = 0;
1794
1795 if (AVAILABLE(skb) < sizeof(*psrc) +
1796 first*sizeof(struct mld2_grec)) {
1797 if (truncate && !first)
1798 break; /* truncate these */
1799 if (pgr)
1800 pgr->grec_nsrcs = htons(scount);
1801 if (skb)
1802 mld_sendpack(skb);
1803 skb = mld_newpack(idev, mtu);
1804 first = 1;
1805 scount = 0;
1806 }
1807 if (first) {
1808 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1809 first = 0;
1810 }
1811 if (!skb)
1812 return NULL;
1813 psrc = skb_put(skb, sizeof(*psrc));
1814 *psrc = psf->sf_addr;
1815 scount++; stotal++;
1816 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1817 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1818 decrease_sf_crcount:
1819 psf->sf_crcount--;
1820 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1821 if (psf_prev)
1822 psf_prev->sf_next = psf->sf_next;
1823 else
1824 *psf_list = psf->sf_next;
1825 kfree(psf);
1826 continue;
1827 }
1828 }
1829 psf_prev = psf;
1830 }
1831
1832 empty_source:
1833 if (!stotal) {
1834 if (type == MLD2_ALLOW_NEW_SOURCES ||
1835 type == MLD2_BLOCK_OLD_SOURCES)
1836 return skb;
1837 if (pmc->mca_crcount || isquery || crsend) {
1838 /* make sure we have room for group header */
1839 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1840 mld_sendpack(skb);
1841 skb = NULL; /* add_grhead will get a new one */
1842 }
1843 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1844 }
1845 }
1846 if (pgr)
1847 pgr->grec_nsrcs = htons(scount);
1848
1849 if (isquery)
1850 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1851 return skb;
1852 }
1853
1854 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1855 {
1856 struct sk_buff *skb = NULL;
1857 int type;
1858
1859 read_lock_bh(&idev->lock);
1860 if (!pmc) {
1861 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1862 if (pmc->mca_flags & MAF_NOREPORT)
1863 continue;
1864 spin_lock_bh(&pmc->mca_lock);
1865 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1866 type = MLD2_MODE_IS_EXCLUDE;
1867 else
1868 type = MLD2_MODE_IS_INCLUDE;
1869 skb = add_grec(skb, pmc, type, 0, 0, 0);
1870 spin_unlock_bh(&pmc->mca_lock);
1871 }
1872 } else {
1873 spin_lock_bh(&pmc->mca_lock);
1874 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1875 type = MLD2_MODE_IS_EXCLUDE;
1876 else
1877 type = MLD2_MODE_IS_INCLUDE;
1878 skb = add_grec(skb, pmc, type, 0, 0, 0);
1879 spin_unlock_bh(&pmc->mca_lock);
1880 }
1881 read_unlock_bh(&idev->lock);
1882 if (skb)
1883 mld_sendpack(skb);
1884 }
1885
1886 /*
1887 * remove zero-count source records from a source filter list
1888 */
1889 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1890 {
1891 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1892
1893 psf_prev = NULL;
1894 for (psf = *ppsf; psf; psf = psf_next) {
1895 psf_next = psf->sf_next;
1896 if (psf->sf_crcount == 0) {
1897 if (psf_prev)
1898 psf_prev->sf_next = psf->sf_next;
1899 else
1900 *ppsf = psf->sf_next;
1901 kfree(psf);
1902 } else
1903 psf_prev = psf;
1904 }
1905 }
1906
1907 static void mld_send_cr(struct inet6_dev *idev)
1908 {
1909 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1910 struct sk_buff *skb = NULL;
1911 int type, dtype;
1912
1913 read_lock_bh(&idev->lock);
1914 spin_lock(&idev->mc_lock);
1915
1916 /* deleted MCA's */
1917 pmc_prev = NULL;
1918 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1919 pmc_next = pmc->next;
1920 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1921 type = MLD2_BLOCK_OLD_SOURCES;
1922 dtype = MLD2_BLOCK_OLD_SOURCES;
1923 skb = add_grec(skb, pmc, type, 1, 0, 0);
1924 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1925 }
1926 if (pmc->mca_crcount) {
1927 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1928 type = MLD2_CHANGE_TO_INCLUDE;
1929 skb = add_grec(skb, pmc, type, 1, 0, 0);
1930 }
1931 pmc->mca_crcount--;
1932 if (pmc->mca_crcount == 0) {
1933 mld_clear_zeros(&pmc->mca_tomb);
1934 mld_clear_zeros(&pmc->mca_sources);
1935 }
1936 }
1937 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1938 !pmc->mca_sources) {
1939 if (pmc_prev)
1940 pmc_prev->next = pmc_next;
1941 else
1942 idev->mc_tomb = pmc_next;
1943 in6_dev_put(pmc->idev);
1944 kfree(pmc);
1945 } else
1946 pmc_prev = pmc;
1947 }
1948 spin_unlock(&idev->mc_lock);
1949
1950 /* change recs */
1951 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1952 spin_lock_bh(&pmc->mca_lock);
1953 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1954 type = MLD2_BLOCK_OLD_SOURCES;
1955 dtype = MLD2_ALLOW_NEW_SOURCES;
1956 } else {
1957 type = MLD2_ALLOW_NEW_SOURCES;
1958 dtype = MLD2_BLOCK_OLD_SOURCES;
1959 }
1960 skb = add_grec(skb, pmc, type, 0, 0, 0);
1961 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1962
1963 /* filter mode changes */
1964 if (pmc->mca_crcount) {
1965 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1966 type = MLD2_CHANGE_TO_EXCLUDE;
1967 else
1968 type = MLD2_CHANGE_TO_INCLUDE;
1969 skb = add_grec(skb, pmc, type, 0, 0, 0);
1970 pmc->mca_crcount--;
1971 }
1972 spin_unlock_bh(&pmc->mca_lock);
1973 }
1974 read_unlock_bh(&idev->lock);
1975 if (!skb)
1976 return;
1977 (void) mld_sendpack(skb);
1978 }
1979
1980 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1981 {
1982 struct net *net = dev_net(dev);
1983 struct sock *sk = net->ipv6.igmp_sk;
1984 struct inet6_dev *idev;
1985 struct sk_buff *skb;
1986 struct mld_msg *hdr;
1987 const struct in6_addr *snd_addr, *saddr;
1988 struct in6_addr addr_buf;
1989 int hlen = LL_RESERVED_SPACE(dev);
1990 int tlen = dev->needed_tailroom;
1991 int err, len, payload_len, full_len;
1992 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1993 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1994 IPV6_TLV_PADN, 0 };
1995 struct flowi6 fl6;
1996 struct dst_entry *dst;
1997
1998 if (type == ICMPV6_MGM_REDUCTION)
1999 snd_addr = &in6addr_linklocal_allrouters;
2000 else
2001 snd_addr = addr;
2002
2003 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2004 payload_len = len + sizeof(ra);
2005 full_len = sizeof(struct ipv6hdr) + payload_len;
2006
2007 rcu_read_lock();
2008 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2009 IPSTATS_MIB_OUT, full_len);
2010 rcu_read_unlock();
2011
2012 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2013
2014 if (!skb) {
2015 rcu_read_lock();
2016 IP6_INC_STATS(net, __in6_dev_get(dev),
2017 IPSTATS_MIB_OUTDISCARDS);
2018 rcu_read_unlock();
2019 return;
2020 }
2021 skb->priority = TC_PRIO_CONTROL;
2022 skb_reserve(skb, hlen);
2023
2024 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2025 /* <draft-ietf-magma-mld-source-05.txt>:
2026 * use unspecified address as the source address
2027 * when a valid link-local address is not available.
2028 */
2029 saddr = &in6addr_any;
2030 } else
2031 saddr = &addr_buf;
2032
2033 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2034
2035 skb_put_data(skb, ra, sizeof(ra));
2036
2037 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2038 hdr->mld_type = type;
2039 hdr->mld_mca = *addr;
2040
2041 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2042 IPPROTO_ICMPV6,
2043 csum_partial(hdr, len, 0));
2044
2045 rcu_read_lock();
2046 idev = __in6_dev_get(skb->dev);
2047
2048 icmpv6_flow_init(sk, &fl6, type,
2049 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2050 skb->dev->ifindex);
2051 dst = icmp6_dst_alloc(skb->dev, &fl6);
2052 if (IS_ERR(dst)) {
2053 err = PTR_ERR(dst);
2054 goto err_out;
2055 }
2056
2057 skb_dst_set(skb, dst);
2058 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2059 net, sk, skb, NULL, skb->dev,
2060 dst_output);
2061 out:
2062 if (!err) {
2063 ICMP6MSGOUT_INC_STATS(net, idev, type);
2064 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2065 } else
2066 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2067
2068 rcu_read_unlock();
2069 return;
2070
2071 err_out:
2072 kfree_skb(skb);
2073 goto out;
2074 }
2075
2076 static void mld_send_initial_cr(struct inet6_dev *idev)
2077 {
2078 struct sk_buff *skb;
2079 struct ifmcaddr6 *pmc;
2080 int type;
2081
2082 if (mld_in_v1_mode(idev))
2083 return;
2084
2085 skb = NULL;
2086 read_lock_bh(&idev->lock);
2087 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2088 spin_lock_bh(&pmc->mca_lock);
2089 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2090 type = MLD2_CHANGE_TO_EXCLUDE;
2091 else
2092 type = MLD2_ALLOW_NEW_SOURCES;
2093 skb = add_grec(skb, pmc, type, 0, 0, 1);
2094 spin_unlock_bh(&pmc->mca_lock);
2095 }
2096 read_unlock_bh(&idev->lock);
2097 if (skb)
2098 mld_sendpack(skb);
2099 }
2100
2101 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2102 {
2103 idev->mc_dad_count = idev->mc_qrv;
2104 if (idev->mc_dad_count) {
2105 mld_send_initial_cr(idev);
2106 idev->mc_dad_count--;
2107 if (idev->mc_dad_count)
2108 mld_dad_start_timer(idev,
2109 unsolicited_report_interval(idev));
2110 }
2111 }
2112
2113 static void mld_dad_timer_expire(struct timer_list *t)
2114 {
2115 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2116
2117 mld_send_initial_cr(idev);
2118 if (idev->mc_dad_count) {
2119 idev->mc_dad_count--;
2120 if (idev->mc_dad_count)
2121 mld_dad_start_timer(idev,
2122 unsolicited_report_interval(idev));
2123 }
2124 in6_dev_put(idev);
2125 }
2126
2127 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2128 const struct in6_addr *psfsrc)
2129 {
2130 struct ip6_sf_list *psf, *psf_prev;
2131 int rv = 0;
2132
2133 psf_prev = NULL;
2134 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2135 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2136 break;
2137 psf_prev = psf;
2138 }
2139 if (!psf || psf->sf_count[sfmode] == 0) {
2140 /* source filter not found, or count wrong => bug */
2141 return -ESRCH;
2142 }
2143 psf->sf_count[sfmode]--;
2144 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2145 struct inet6_dev *idev = pmc->idev;
2146
2147 /* no more filters for this source */
2148 if (psf_prev)
2149 psf_prev->sf_next = psf->sf_next;
2150 else
2151 pmc->mca_sources = psf->sf_next;
2152 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2153 !mld_in_v1_mode(idev)) {
2154 psf->sf_crcount = idev->mc_qrv;
2155 psf->sf_next = pmc->mca_tomb;
2156 pmc->mca_tomb = psf;
2157 rv = 1;
2158 } else
2159 kfree(psf);
2160 }
2161 return rv;
2162 }
2163
2164 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2165 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2166 int delta)
2167 {
2168 struct ifmcaddr6 *pmc;
2169 int changerec = 0;
2170 int i, err;
2171
2172 if (!idev)
2173 return -ENODEV;
2174 read_lock_bh(&idev->lock);
2175 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2176 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2177 break;
2178 }
2179 if (!pmc) {
2180 /* MCA not found?? bug */
2181 read_unlock_bh(&idev->lock);
2182 return -ESRCH;
2183 }
2184 spin_lock_bh(&pmc->mca_lock);
2185 sf_markstate(pmc);
2186 if (!delta) {
2187 if (!pmc->mca_sfcount[sfmode]) {
2188 spin_unlock_bh(&pmc->mca_lock);
2189 read_unlock_bh(&idev->lock);
2190 return -EINVAL;
2191 }
2192 pmc->mca_sfcount[sfmode]--;
2193 }
2194 err = 0;
2195 for (i = 0; i < sfcount; i++) {
2196 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2197
2198 changerec |= rv > 0;
2199 if (!err && rv < 0)
2200 err = rv;
2201 }
2202 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2203 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2204 pmc->mca_sfcount[MCAST_INCLUDE]) {
2205 struct ip6_sf_list *psf;
2206
2207 /* filter mode change */
2208 pmc->mca_sfmode = MCAST_INCLUDE;
2209 pmc->mca_crcount = idev->mc_qrv;
2210 idev->mc_ifc_count = pmc->mca_crcount;
2211 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2212 psf->sf_crcount = 0;
2213 mld_ifc_event(pmc->idev);
2214 } else if (sf_setstate(pmc) || changerec)
2215 mld_ifc_event(pmc->idev);
2216 spin_unlock_bh(&pmc->mca_lock);
2217 read_unlock_bh(&idev->lock);
2218 return err;
2219 }
2220
2221 /*
2222 * Add multicast single-source filter to the interface list
2223 */
2224 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2225 const struct in6_addr *psfsrc)
2226 {
2227 struct ip6_sf_list *psf, *psf_prev;
2228
2229 psf_prev = NULL;
2230 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2231 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2232 break;
2233 psf_prev = psf;
2234 }
2235 if (!psf) {
2236 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2237 if (!psf)
2238 return -ENOBUFS;
2239
2240 psf->sf_addr = *psfsrc;
2241 if (psf_prev) {
2242 psf_prev->sf_next = psf;
2243 } else
2244 pmc->mca_sources = psf;
2245 }
2246 psf->sf_count[sfmode]++;
2247 return 0;
2248 }
2249
2250 static void sf_markstate(struct ifmcaddr6 *pmc)
2251 {
2252 struct ip6_sf_list *psf;
2253 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2254
2255 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2256 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2257 psf->sf_oldin = mca_xcount ==
2258 psf->sf_count[MCAST_EXCLUDE] &&
2259 !psf->sf_count[MCAST_INCLUDE];
2260 } else
2261 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2262 }
2263
2264 static int sf_setstate(struct ifmcaddr6 *pmc)
2265 {
2266 struct ip6_sf_list *psf, *dpsf;
2267 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2268 int qrv = pmc->idev->mc_qrv;
2269 int new_in, rv;
2270
2271 rv = 0;
2272 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2273 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2274 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2275 !psf->sf_count[MCAST_INCLUDE];
2276 } else
2277 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2278 if (new_in) {
2279 if (!psf->sf_oldin) {
2280 struct ip6_sf_list *prev = NULL;
2281
2282 for (dpsf = pmc->mca_tomb; dpsf;
2283 dpsf = dpsf->sf_next) {
2284 if (ipv6_addr_equal(&dpsf->sf_addr,
2285 &psf->sf_addr))
2286 break;
2287 prev = dpsf;
2288 }
2289 if (dpsf) {
2290 if (prev)
2291 prev->sf_next = dpsf->sf_next;
2292 else
2293 pmc->mca_tomb = dpsf->sf_next;
2294 kfree(dpsf);
2295 }
2296 psf->sf_crcount = qrv;
2297 rv++;
2298 }
2299 } else if (psf->sf_oldin) {
2300 psf->sf_crcount = 0;
2301 /*
2302 * add or update "delete" records if an active filter
2303 * is now inactive
2304 */
2305 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2306 if (ipv6_addr_equal(&dpsf->sf_addr,
2307 &psf->sf_addr))
2308 break;
2309 if (!dpsf) {
2310 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2311 if (!dpsf)
2312 continue;
2313 *dpsf = *psf;
2314 /* pmc->mca_lock held by callers */
2315 dpsf->sf_next = pmc->mca_tomb;
2316 pmc->mca_tomb = dpsf;
2317 }
2318 dpsf->sf_crcount = qrv;
2319 rv++;
2320 }
2321 }
2322 return rv;
2323 }
2324
2325 /*
2326 * Add multicast source filter list to the interface list
2327 */
2328 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2329 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2330 int delta)
2331 {
2332 struct ifmcaddr6 *pmc;
2333 int isexclude;
2334 int i, err;
2335
2336 if (!idev)
2337 return -ENODEV;
2338 read_lock_bh(&idev->lock);
2339 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2340 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2341 break;
2342 }
2343 if (!pmc) {
2344 /* MCA not found?? bug */
2345 read_unlock_bh(&idev->lock);
2346 return -ESRCH;
2347 }
2348 spin_lock_bh(&pmc->mca_lock);
2349
2350 sf_markstate(pmc);
2351 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2352 if (!delta)
2353 pmc->mca_sfcount[sfmode]++;
2354 err = 0;
2355 for (i = 0; i < sfcount; i++) {
2356 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2357 if (err)
2358 break;
2359 }
2360 if (err) {
2361 int j;
2362
2363 if (!delta)
2364 pmc->mca_sfcount[sfmode]--;
2365 for (j = 0; j < i; j++)
2366 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2367 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2368 struct ip6_sf_list *psf;
2369
2370 /* filter mode change */
2371 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2372 pmc->mca_sfmode = MCAST_EXCLUDE;
2373 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2374 pmc->mca_sfmode = MCAST_INCLUDE;
2375 /* else no filters; keep old mode for reports */
2376
2377 pmc->mca_crcount = idev->mc_qrv;
2378 idev->mc_ifc_count = pmc->mca_crcount;
2379 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2380 psf->sf_crcount = 0;
2381 mld_ifc_event(idev);
2382 } else if (sf_setstate(pmc))
2383 mld_ifc_event(idev);
2384 spin_unlock_bh(&pmc->mca_lock);
2385 read_unlock_bh(&idev->lock);
2386 return err;
2387 }
2388
2389 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2390 {
2391 struct ip6_sf_list *psf, *nextpsf;
2392
2393 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2394 nextpsf = psf->sf_next;
2395 kfree(psf);
2396 }
2397 pmc->mca_tomb = NULL;
2398 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2399 nextpsf = psf->sf_next;
2400 kfree(psf);
2401 }
2402 pmc->mca_sources = NULL;
2403 pmc->mca_sfmode = MCAST_EXCLUDE;
2404 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2405 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2406 }
2407
2408
2409 static void igmp6_join_group(struct ifmcaddr6 *ma)
2410 {
2411 unsigned long delay;
2412
2413 if (ma->mca_flags & MAF_NOREPORT)
2414 return;
2415
2416 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2417
2418 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2419
2420 spin_lock_bh(&ma->mca_lock);
2421 if (del_timer(&ma->mca_timer)) {
2422 refcount_dec(&ma->mca_refcnt);
2423 delay = ma->mca_timer.expires - jiffies;
2424 }
2425
2426 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2427 refcount_inc(&ma->mca_refcnt);
2428 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2429 spin_unlock_bh(&ma->mca_lock);
2430 }
2431
2432 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2433 struct inet6_dev *idev)
2434 {
2435 int err;
2436
2437 write_lock_bh(&iml->sflock);
2438 if (!iml->sflist) {
2439 /* any-source empty exclude case */
2440 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2441 } else {
2442 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2443 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2444 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2445 iml->sflist = NULL;
2446 }
2447 write_unlock_bh(&iml->sflock);
2448 return err;
2449 }
2450
2451 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2452 {
2453 if (mld_in_v1_mode(ma->idev)) {
2454 if (ma->mca_flags & MAF_LAST_REPORTER)
2455 igmp6_send(&ma->mca_addr, ma->idev->dev,
2456 ICMPV6_MGM_REDUCTION);
2457 } else {
2458 mld_add_delrec(ma->idev, ma);
2459 mld_ifc_event(ma->idev);
2460 }
2461 }
2462
2463 static void mld_gq_timer_expire(struct timer_list *t)
2464 {
2465 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2466
2467 idev->mc_gq_running = 0;
2468 mld_send_report(idev, NULL);
2469 in6_dev_put(idev);
2470 }
2471
2472 static void mld_ifc_timer_expire(struct timer_list *t)
2473 {
2474 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2475
2476 mld_send_cr(idev);
2477 if (idev->mc_ifc_count) {
2478 idev->mc_ifc_count--;
2479 if (idev->mc_ifc_count)
2480 mld_ifc_start_timer(idev,
2481 unsolicited_report_interval(idev));
2482 }
2483 in6_dev_put(idev);
2484 }
2485
2486 static void mld_ifc_event(struct inet6_dev *idev)
2487 {
2488 if (mld_in_v1_mode(idev))
2489 return;
2490 idev->mc_ifc_count = idev->mc_qrv;
2491 mld_ifc_start_timer(idev, 1);
2492 }
2493
2494 static void igmp6_timer_handler(struct timer_list *t)
2495 {
2496 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2497
2498 if (mld_in_v1_mode(ma->idev))
2499 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2500 else
2501 mld_send_report(ma->idev, ma);
2502
2503 spin_lock(&ma->mca_lock);
2504 ma->mca_flags |= MAF_LAST_REPORTER;
2505 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2506 spin_unlock(&ma->mca_lock);
2507 ma_put(ma);
2508 }
2509
2510 /* Device changing type */
2511
2512 void ipv6_mc_unmap(struct inet6_dev *idev)
2513 {
2514 struct ifmcaddr6 *i;
2515
2516 /* Install multicast list, except for all-nodes (already installed) */
2517
2518 read_lock_bh(&idev->lock);
2519 for (i = idev->mc_list; i; i = i->next)
2520 igmp6_group_dropped(i);
2521 read_unlock_bh(&idev->lock);
2522 }
2523
2524 void ipv6_mc_remap(struct inet6_dev *idev)
2525 {
2526 ipv6_mc_up(idev);
2527 }
2528
2529 /* Device going down */
2530
2531 void ipv6_mc_down(struct inet6_dev *idev)
2532 {
2533 struct ifmcaddr6 *i;
2534
2535 /* Withdraw multicast list */
2536
2537 read_lock_bh(&idev->lock);
2538
2539 for (i = idev->mc_list; i; i = i->next)
2540 igmp6_group_dropped(i);
2541
2542 /* Should stop timer after group drop. or we will
2543 * start timer again in mld_ifc_event()
2544 */
2545 mld_ifc_stop_timer(idev);
2546 mld_gq_stop_timer(idev);
2547 mld_dad_stop_timer(idev);
2548 read_unlock_bh(&idev->lock);
2549 }
2550
2551 static void ipv6_mc_reset(struct inet6_dev *idev)
2552 {
2553 idev->mc_qrv = sysctl_mld_qrv;
2554 idev->mc_qi = MLD_QI_DEFAULT;
2555 idev->mc_qri = MLD_QRI_DEFAULT;
2556 idev->mc_v1_seen = 0;
2557 idev->mc_maxdelay = unsolicited_report_interval(idev);
2558 }
2559
2560 /* Device going up */
2561
2562 void ipv6_mc_up(struct inet6_dev *idev)
2563 {
2564 struct ifmcaddr6 *i;
2565
2566 /* Install multicast list, except for all-nodes (already installed) */
2567
2568 read_lock_bh(&idev->lock);
2569 ipv6_mc_reset(idev);
2570 for (i = idev->mc_list; i; i = i->next) {
2571 mld_del_delrec(idev, i);
2572 igmp6_group_added(i);
2573 }
2574 read_unlock_bh(&idev->lock);
2575 }
2576
2577 /* IPv6 device initialization. */
2578
2579 void ipv6_mc_init_dev(struct inet6_dev *idev)
2580 {
2581 write_lock_bh(&idev->lock);
2582 spin_lock_init(&idev->mc_lock);
2583 idev->mc_gq_running = 0;
2584 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2585 idev->mc_tomb = NULL;
2586 idev->mc_ifc_count = 0;
2587 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2588 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2589 ipv6_mc_reset(idev);
2590 write_unlock_bh(&idev->lock);
2591 }
2592
2593 /*
2594 * Device is about to be destroyed: clean up.
2595 */
2596
2597 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2598 {
2599 struct ifmcaddr6 *i;
2600
2601 /* Deactivate timers */
2602 ipv6_mc_down(idev);
2603 mld_clear_delrec(idev);
2604
2605 /* Delete all-nodes address. */
2606 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2607 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2608 * fail.
2609 */
2610 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2611
2612 if (idev->cnf.forwarding)
2613 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2614
2615 write_lock_bh(&idev->lock);
2616 while ((i = idev->mc_list) != NULL) {
2617 idev->mc_list = i->next;
2618
2619 write_unlock_bh(&idev->lock);
2620 ma_put(i);
2621 write_lock_bh(&idev->lock);
2622 }
2623 write_unlock_bh(&idev->lock);
2624 }
2625
2626 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2627 {
2628 struct ifmcaddr6 *pmc;
2629
2630 ASSERT_RTNL();
2631
2632 if (mld_in_v1_mode(idev)) {
2633 read_lock_bh(&idev->lock);
2634 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2635 igmp6_join_group(pmc);
2636 read_unlock_bh(&idev->lock);
2637 } else
2638 mld_send_report(idev, NULL);
2639 }
2640
2641 static int ipv6_mc_netdev_event(struct notifier_block *this,
2642 unsigned long event,
2643 void *ptr)
2644 {
2645 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2646 struct inet6_dev *idev = __in6_dev_get(dev);
2647
2648 switch (event) {
2649 case NETDEV_RESEND_IGMP:
2650 if (idev)
2651 ipv6_mc_rejoin_groups(idev);
2652 break;
2653 default:
2654 break;
2655 }
2656
2657 return NOTIFY_DONE;
2658 }
2659
2660 static struct notifier_block igmp6_netdev_notifier = {
2661 .notifier_call = ipv6_mc_netdev_event,
2662 };
2663
2664 #ifdef CONFIG_PROC_FS
2665 struct igmp6_mc_iter_state {
2666 struct seq_net_private p;
2667 struct net_device *dev;
2668 struct inet6_dev *idev;
2669 };
2670
2671 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2672
2673 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2674 {
2675 struct ifmcaddr6 *im = NULL;
2676 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2677 struct net *net = seq_file_net(seq);
2678
2679 state->idev = NULL;
2680 for_each_netdev_rcu(net, state->dev) {
2681 struct inet6_dev *idev;
2682 idev = __in6_dev_get(state->dev);
2683 if (!idev)
2684 continue;
2685 read_lock_bh(&idev->lock);
2686 im = idev->mc_list;
2687 if (im) {
2688 state->idev = idev;
2689 break;
2690 }
2691 read_unlock_bh(&idev->lock);
2692 }
2693 return im;
2694 }
2695
2696 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2697 {
2698 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2699
2700 im = im->next;
2701 while (!im) {
2702 if (likely(state->idev))
2703 read_unlock_bh(&state->idev->lock);
2704
2705 state->dev = next_net_device_rcu(state->dev);
2706 if (!state->dev) {
2707 state->idev = NULL;
2708 break;
2709 }
2710 state->idev = __in6_dev_get(state->dev);
2711 if (!state->idev)
2712 continue;
2713 read_lock_bh(&state->idev->lock);
2714 im = state->idev->mc_list;
2715 }
2716 return im;
2717 }
2718
2719 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2720 {
2721 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2722 if (im)
2723 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2724 --pos;
2725 return pos ? NULL : im;
2726 }
2727
2728 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2729 __acquires(RCU)
2730 {
2731 rcu_read_lock();
2732 return igmp6_mc_get_idx(seq, *pos);
2733 }
2734
2735 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2736 {
2737 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2738
2739 ++*pos;
2740 return im;
2741 }
2742
2743 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2744 __releases(RCU)
2745 {
2746 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2747
2748 if (likely(state->idev)) {
2749 read_unlock_bh(&state->idev->lock);
2750 state->idev = NULL;
2751 }
2752 state->dev = NULL;
2753 rcu_read_unlock();
2754 }
2755
2756 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2757 {
2758 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2759 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2760
2761 seq_printf(seq,
2762 "%-4d %-15s %pi6 %5d %08X %ld\n",
2763 state->dev->ifindex, state->dev->name,
2764 &im->mca_addr,
2765 im->mca_users, im->mca_flags,
2766 (im->mca_flags&MAF_TIMER_RUNNING) ?
2767 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2768 return 0;
2769 }
2770
2771 static const struct seq_operations igmp6_mc_seq_ops = {
2772 .start = igmp6_mc_seq_start,
2773 .next = igmp6_mc_seq_next,
2774 .stop = igmp6_mc_seq_stop,
2775 .show = igmp6_mc_seq_show,
2776 };
2777
2778 struct igmp6_mcf_iter_state {
2779 struct seq_net_private p;
2780 struct net_device *dev;
2781 struct inet6_dev *idev;
2782 struct ifmcaddr6 *im;
2783 };
2784
2785 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2786
2787 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2788 {
2789 struct ip6_sf_list *psf = NULL;
2790 struct ifmcaddr6 *im = NULL;
2791 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2792 struct net *net = seq_file_net(seq);
2793
2794 state->idev = NULL;
2795 state->im = NULL;
2796 for_each_netdev_rcu(net, state->dev) {
2797 struct inet6_dev *idev;
2798 idev = __in6_dev_get(state->dev);
2799 if (unlikely(idev == NULL))
2800 continue;
2801 read_lock_bh(&idev->lock);
2802 im = idev->mc_list;
2803 if (likely(im)) {
2804 spin_lock_bh(&im->mca_lock);
2805 psf = im->mca_sources;
2806 if (likely(psf)) {
2807 state->im = im;
2808 state->idev = idev;
2809 break;
2810 }
2811 spin_unlock_bh(&im->mca_lock);
2812 }
2813 read_unlock_bh(&idev->lock);
2814 }
2815 return psf;
2816 }
2817
2818 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2819 {
2820 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2821
2822 psf = psf->sf_next;
2823 while (!psf) {
2824 spin_unlock_bh(&state->im->mca_lock);
2825 state->im = state->im->next;
2826 while (!state->im) {
2827 if (likely(state->idev))
2828 read_unlock_bh(&state->idev->lock);
2829
2830 state->dev = next_net_device_rcu(state->dev);
2831 if (!state->dev) {
2832 state->idev = NULL;
2833 goto out;
2834 }
2835 state->idev = __in6_dev_get(state->dev);
2836 if (!state->idev)
2837 continue;
2838 read_lock_bh(&state->idev->lock);
2839 state->im = state->idev->mc_list;
2840 }
2841 if (!state->im)
2842 break;
2843 spin_lock_bh(&state->im->mca_lock);
2844 psf = state->im->mca_sources;
2845 }
2846 out:
2847 return psf;
2848 }
2849
2850 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2851 {
2852 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2853 if (psf)
2854 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2855 --pos;
2856 return pos ? NULL : psf;
2857 }
2858
2859 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2860 __acquires(RCU)
2861 {
2862 rcu_read_lock();
2863 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2864 }
2865
2866 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2867 {
2868 struct ip6_sf_list *psf;
2869 if (v == SEQ_START_TOKEN)
2870 psf = igmp6_mcf_get_first(seq);
2871 else
2872 psf = igmp6_mcf_get_next(seq, v);
2873 ++*pos;
2874 return psf;
2875 }
2876
2877 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2878 __releases(RCU)
2879 {
2880 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2881 if (likely(state->im)) {
2882 spin_unlock_bh(&state->im->mca_lock);
2883 state->im = NULL;
2884 }
2885 if (likely(state->idev)) {
2886 read_unlock_bh(&state->idev->lock);
2887 state->idev = NULL;
2888 }
2889 state->dev = NULL;
2890 rcu_read_unlock();
2891 }
2892
2893 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2894 {
2895 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2896 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2897
2898 if (v == SEQ_START_TOKEN) {
2899 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2900 } else {
2901 seq_printf(seq,
2902 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2903 state->dev->ifindex, state->dev->name,
2904 &state->im->mca_addr,
2905 &psf->sf_addr,
2906 psf->sf_count[MCAST_INCLUDE],
2907 psf->sf_count[MCAST_EXCLUDE]);
2908 }
2909 return 0;
2910 }
2911
2912 static const struct seq_operations igmp6_mcf_seq_ops = {
2913 .start = igmp6_mcf_seq_start,
2914 .next = igmp6_mcf_seq_next,
2915 .stop = igmp6_mcf_seq_stop,
2916 .show = igmp6_mcf_seq_show,
2917 };
2918
2919 static int __net_init igmp6_proc_init(struct net *net)
2920 {
2921 int err;
2922
2923 err = -ENOMEM;
2924 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
2925 sizeof(struct igmp6_mc_iter_state)))
2926 goto out;
2927 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
2928 &igmp6_mcf_seq_ops,
2929 sizeof(struct igmp6_mcf_iter_state)))
2930 goto out_proc_net_igmp6;
2931
2932 err = 0;
2933 out:
2934 return err;
2935
2936 out_proc_net_igmp6:
2937 remove_proc_entry("igmp6", net->proc_net);
2938 goto out;
2939 }
2940
2941 static void __net_exit igmp6_proc_exit(struct net *net)
2942 {
2943 remove_proc_entry("mcfilter6", net->proc_net);
2944 remove_proc_entry("igmp6", net->proc_net);
2945 }
2946 #else
2947 static inline int igmp6_proc_init(struct net *net)
2948 {
2949 return 0;
2950 }
2951 static inline void igmp6_proc_exit(struct net *net)
2952 {
2953 }
2954 #endif
2955
2956 static int __net_init igmp6_net_init(struct net *net)
2957 {
2958 int err;
2959
2960 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2961 SOCK_RAW, IPPROTO_ICMPV6, net);
2962 if (err < 0) {
2963 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2964 err);
2965 goto out;
2966 }
2967
2968 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2969
2970 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2971 SOCK_RAW, IPPROTO_ICMPV6, net);
2972 if (err < 0) {
2973 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2974 err);
2975 goto out_sock_create;
2976 }
2977
2978 err = igmp6_proc_init(net);
2979 if (err)
2980 goto out_sock_create_autojoin;
2981
2982 return 0;
2983
2984 out_sock_create_autojoin:
2985 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2986 out_sock_create:
2987 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2988 out:
2989 return err;
2990 }
2991
2992 static void __net_exit igmp6_net_exit(struct net *net)
2993 {
2994 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2995 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2996 igmp6_proc_exit(net);
2997 }
2998
2999 static struct pernet_operations igmp6_net_ops = {
3000 .init = igmp6_net_init,
3001 .exit = igmp6_net_exit,
3002 };
3003
3004 int __init igmp6_init(void)
3005 {
3006 return register_pernet_subsys(&igmp6_net_ops);
3007 }
3008
3009 int __init igmp6_late_init(void)
3010 {
3011 return register_netdevice_notifier(&igmp6_netdev_notifier);
3012 }
3013
3014 void igmp6_cleanup(void)
3015 {
3016 unregister_pernet_subsys(&igmp6_net_ops);
3017 }
3018
3019 void igmp6_late_cleanup(void)
3020 {
3021 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3022 }
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