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Linux 4.19.133
[linux/fpc-iii.git] / net / ipv6 / mcast.c
blobf2f8551416c3363a0ee6f1f4648bc963b4b3cf22
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 int __mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_ZERO(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(struct timer_list *t);
79
80 static void mld_gq_timer_expire(struct timer_list *t);
81 static void mld_ifc_timer_expire(struct timer_list *t);
82 static void mld_ifc_event(struct inet6_dev *idev);
83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
84 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
85 static void mld_clear_delrec(struct inet6_dev *idev);
86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
87 static int sf_setstate(struct ifmcaddr6 *pmc);
88 static void sf_markstate(struct ifmcaddr6 *pmc);
89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
91 int sfmode, int sfcount, const struct in6_addr *psfsrc,
92 int delta);
93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
94 int sfmode, int sfcount, const struct in6_addr *psfsrc,
95 int delta);
96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
97 struct inet6_dev *idev);
98 static int __ipv6_dev_mc_inc(struct net_device *dev,
99 const struct in6_addr *addr, unsigned int mode);
100
101 #define MLD_QRV_DEFAULT 2
102 /* RFC3810, 9.2. Query Interval */
103 #define MLD_QI_DEFAULT (125 * HZ)
104 /* RFC3810, 9.3. Query Response Interval */
105 #define MLD_QRI_DEFAULT (10 * HZ)
106
107 /* RFC3810, 8.1 Query Version Distinctions */
108 #define MLD_V1_QUERY_LEN 24
109 #define MLD_V2_QUERY_LEN_MIN 28
110
111 #define IPV6_MLD_MAX_MSF 64
112
113 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
114 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
115
116 /*
117 * socket join on multicast group
118 */
119
120 #define for_each_pmc_rcu(np, pmc) \
121 for (pmc = rcu_dereference(np->ipv6_mc_list); \
122 pmc != NULL; \
123 pmc = rcu_dereference(pmc->next))
124
125 static int unsolicited_report_interval(struct inet6_dev *idev)
126 {
127 int iv;
128
129 if (mld_in_v1_mode(idev))
130 iv = idev->cnf.mldv1_unsolicited_report_interval;
131 else
132 iv = idev->cnf.mldv2_unsolicited_report_interval;
133
134 return iv > 0 ? iv : 1;
135 }
136
137 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
138 const struct in6_addr *addr, unsigned int mode)
139 {
140 struct net_device *dev = NULL;
141 struct ipv6_mc_socklist *mc_lst;
142 struct ipv6_pinfo *np = inet6_sk(sk);
143 struct net *net = sock_net(sk);
144 int err;
145
146 ASSERT_RTNL();
147
148 if (!ipv6_addr_is_multicast(addr))
149 return -EINVAL;
150
151 rcu_read_lock();
152 for_each_pmc_rcu(np, mc_lst) {
153 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
154 ipv6_addr_equal(&mc_lst->addr, addr)) {
155 rcu_read_unlock();
156 return -EADDRINUSE;
157 }
158 }
159 rcu_read_unlock();
160
161 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
162
163 if (!mc_lst)
164 return -ENOMEM;
165
166 mc_lst->next = NULL;
167 mc_lst->addr = *addr;
168
169 if (ifindex == 0) {
170 struct rt6_info *rt;
171 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
172 if (rt) {
173 dev = rt->dst.dev;
174 ip6_rt_put(rt);
175 }
176 } else
177 dev = __dev_get_by_index(net, ifindex);
178
179 if (!dev) {
180 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
181 return -ENODEV;
182 }
183
184 mc_lst->ifindex = dev->ifindex;
185 mc_lst->sfmode = mode;
186 rwlock_init(&mc_lst->sflock);
187 mc_lst->sflist = NULL;
188
189 /*
190 * now add/increase the group membership on the device
191 */
192
193 err = __ipv6_dev_mc_inc(dev, addr, mode);
194
195 if (err) {
196 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
197 return err;
198 }
199
200 mc_lst->next = np->ipv6_mc_list;
201 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
202
203 return 0;
204 }
205
206 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
207 {
208 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
209 }
210 EXPORT_SYMBOL(ipv6_sock_mc_join);
211
212 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
213 const struct in6_addr *addr, unsigned int mode)
214 {
215 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
216 }
217
218 /*
219 * socket leave on multicast group
220 */
221 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
222 {
223 struct ipv6_pinfo *np = inet6_sk(sk);
224 struct ipv6_mc_socklist *mc_lst;
225 struct ipv6_mc_socklist __rcu **lnk;
226 struct net *net = sock_net(sk);
227
228 ASSERT_RTNL();
229
230 if (!ipv6_addr_is_multicast(addr))
231 return -EINVAL;
232
233 for (lnk = &np->ipv6_mc_list;
234 (mc_lst = rtnl_dereference(*lnk)) != NULL;
235 lnk = &mc_lst->next) {
236 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
237 ipv6_addr_equal(&mc_lst->addr, addr)) {
238 struct net_device *dev;
239
240 *lnk = mc_lst->next;
241
242 dev = __dev_get_by_index(net, mc_lst->ifindex);
243 if (dev) {
244 struct inet6_dev *idev = __in6_dev_get(dev);
245
246 (void) ip6_mc_leave_src(sk, mc_lst, idev);
247 if (idev)
248 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
249 } else
250 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
251
252 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
253 kfree_rcu(mc_lst, rcu);
254 return 0;
255 }
256 }
257
258 return -EADDRNOTAVAIL;
259 }
260 EXPORT_SYMBOL(ipv6_sock_mc_drop);
261
262 /* called with rcu_read_lock() */
263 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
264 const struct in6_addr *group,
265 int ifindex)
266 {
267 struct net_device *dev = NULL;
268 struct inet6_dev *idev = NULL;
269
270 if (ifindex == 0) {
271 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
272
273 if (rt) {
274 dev = rt->dst.dev;
275 ip6_rt_put(rt);
276 }
277 } else
278 dev = dev_get_by_index_rcu(net, ifindex);
279
280 if (!dev)
281 return NULL;
282 idev = __in6_dev_get(dev);
283 if (!idev)
284 return NULL;
285 read_lock_bh(&idev->lock);
286 if (idev->dead) {
287 read_unlock_bh(&idev->lock);
288 return NULL;
289 }
290 return idev;
291 }
292
293 void __ipv6_sock_mc_close(struct sock *sk)
294 {
295 struct ipv6_pinfo *np = inet6_sk(sk);
296 struct ipv6_mc_socklist *mc_lst;
297 struct net *net = sock_net(sk);
298
299 ASSERT_RTNL();
300
301 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
302 struct net_device *dev;
303
304 np->ipv6_mc_list = mc_lst->next;
305
306 dev = __dev_get_by_index(net, mc_lst->ifindex);
307 if (dev) {
308 struct inet6_dev *idev = __in6_dev_get(dev);
309
310 (void) ip6_mc_leave_src(sk, mc_lst, idev);
311 if (idev)
312 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
313 } else
314 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
315
316 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
317 kfree_rcu(mc_lst, rcu);
318 }
319 }
320
321 void ipv6_sock_mc_close(struct sock *sk)
322 {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324
325 if (!rcu_access_pointer(np->ipv6_mc_list))
326 return;
327 rtnl_lock();
328 __ipv6_sock_mc_close(sk);
329 rtnl_unlock();
330 }
331
332 int ip6_mc_source(int add, int omode, struct sock *sk,
333 struct group_source_req *pgsr)
334 {
335 struct in6_addr *source, *group;
336 struct ipv6_mc_socklist *pmc;
337 struct inet6_dev *idev;
338 struct ipv6_pinfo *inet6 = inet6_sk(sk);
339 struct ip6_sf_socklist *psl;
340 struct net *net = sock_net(sk);
341 int i, j, rv;
342 int leavegroup = 0;
343 int pmclocked = 0;
344 int err;
345
346 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
347 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
348
349 if (!ipv6_addr_is_multicast(group))
350 return -EINVAL;
351
352 rcu_read_lock();
353 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
354 if (!idev) {
355 rcu_read_unlock();
356 return -ENODEV;
357 }
358
359 err = -EADDRNOTAVAIL;
360
361 for_each_pmc_rcu(inet6, pmc) {
362 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
363 continue;
364 if (ipv6_addr_equal(&pmc->addr, group))
365 break;
366 }
367 if (!pmc) { /* must have a prior join */
368 err = -EINVAL;
369 goto done;
370 }
371 /* if a source filter was set, must be the same mode as before */
372 if (pmc->sflist) {
373 if (pmc->sfmode != omode) {
374 err = -EINVAL;
375 goto done;
376 }
377 } else if (pmc->sfmode != omode) {
378 /* allow mode switches for empty-set filters */
379 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
380 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
381 pmc->sfmode = omode;
382 }
383
384 write_lock(&pmc->sflock);
385 pmclocked = 1;
386
387 psl = pmc->sflist;
388 if (!add) {
389 if (!psl)
390 goto done; /* err = -EADDRNOTAVAIL */
391 rv = !0;
392 for (i = 0; i < psl->sl_count; i++) {
393 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
394 if (rv == 0)
395 break;
396 }
397 if (rv) /* source not found */
398 goto done; /* err = -EADDRNOTAVAIL */
399
400 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
401 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
402 leavegroup = 1;
403 goto done;
404 }
405
406 /* update the interface filter */
407 ip6_mc_del_src(idev, group, omode, 1, source, 1);
408
409 for (j = i+1; j < psl->sl_count; j++)
410 psl->sl_addr[j-1] = psl->sl_addr[j];
411 psl->sl_count--;
412 err = 0;
413 goto done;
414 }
415 /* else, add a new source to the filter */
416
417 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
418 err = -ENOBUFS;
419 goto done;
420 }
421 if (!psl || psl->sl_count == psl->sl_max) {
422 struct ip6_sf_socklist *newpsl;
423 int count = IP6_SFBLOCK;
424
425 if (psl)
426 count += psl->sl_max;
427 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
428 if (!newpsl) {
429 err = -ENOBUFS;
430 goto done;
431 }
432 newpsl->sl_max = count;
433 newpsl->sl_count = count - IP6_SFBLOCK;
434 if (psl) {
435 for (i = 0; i < psl->sl_count; i++)
436 newpsl->sl_addr[i] = psl->sl_addr[i];
437 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
438 }
439 pmc->sflist = psl = newpsl;
440 }
441 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
442 for (i = 0; i < psl->sl_count; i++) {
443 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
444 if (rv == 0) /* There is an error in the address. */
445 goto done;
446 }
447 for (j = psl->sl_count-1; j >= i; j--)
448 psl->sl_addr[j+1] = psl->sl_addr[j];
449 psl->sl_addr[i] = *source;
450 psl->sl_count++;
451 err = 0;
452 /* update the interface list */
453 ip6_mc_add_src(idev, group, omode, 1, source, 1);
454 done:
455 if (pmclocked)
456 write_unlock(&pmc->sflock);
457 read_unlock_bh(&idev->lock);
458 rcu_read_unlock();
459 if (leavegroup)
460 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
461 return err;
462 }
463
464 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
465 {
466 const struct in6_addr *group;
467 struct ipv6_mc_socklist *pmc;
468 struct inet6_dev *idev;
469 struct ipv6_pinfo *inet6 = inet6_sk(sk);
470 struct ip6_sf_socklist *newpsl, *psl;
471 struct net *net = sock_net(sk);
472 int leavegroup = 0;
473 int i, err;
474
475 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
476
477 if (!ipv6_addr_is_multicast(group))
478 return -EINVAL;
479 if (gsf->gf_fmode != MCAST_INCLUDE &&
480 gsf->gf_fmode != MCAST_EXCLUDE)
481 return -EINVAL;
482
483 rcu_read_lock();
484 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
485
486 if (!idev) {
487 rcu_read_unlock();
488 return -ENODEV;
489 }
490
491 err = 0;
492
493 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
494 leavegroup = 1;
495 goto done;
496 }
497
498 for_each_pmc_rcu(inet6, pmc) {
499 if (pmc->ifindex != gsf->gf_interface)
500 continue;
501 if (ipv6_addr_equal(&pmc->addr, group))
502 break;
503 }
504 if (!pmc) { /* must have a prior join */
505 err = -EINVAL;
506 goto done;
507 }
508 if (gsf->gf_numsrc) {
509 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
510 GFP_ATOMIC);
511 if (!newpsl) {
512 err = -ENOBUFS;
513 goto done;
514 }
515 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
516 for (i = 0; i < newpsl->sl_count; ++i) {
517 struct sockaddr_in6 *psin6;
518
519 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
520 newpsl->sl_addr[i] = psin6->sin6_addr;
521 }
522 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
523 newpsl->sl_count, newpsl->sl_addr, 0);
524 if (err) {
525 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
526 goto done;
527 }
528 } else {
529 newpsl = NULL;
530 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
531 }
532
533 write_lock(&pmc->sflock);
534 psl = pmc->sflist;
535 if (psl) {
536 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
537 psl->sl_count, psl->sl_addr, 0);
538 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
539 } else
540 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
541 pmc->sflist = newpsl;
542 pmc->sfmode = gsf->gf_fmode;
543 write_unlock(&pmc->sflock);
544 err = 0;
545 done:
546 read_unlock_bh(&idev->lock);
547 rcu_read_unlock();
548 if (leavegroup)
549 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
550 return err;
551 }
552
553 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
554 struct group_filter __user *optval, int __user *optlen)
555 {
556 int err, i, count, copycount;
557 const struct in6_addr *group;
558 struct ipv6_mc_socklist *pmc;
559 struct inet6_dev *idev;
560 struct ipv6_pinfo *inet6 = inet6_sk(sk);
561 struct ip6_sf_socklist *psl;
562 struct net *net = sock_net(sk);
563
564 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
565
566 if (!ipv6_addr_is_multicast(group))
567 return -EINVAL;
568
569 rcu_read_lock();
570 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
571
572 if (!idev) {
573 rcu_read_unlock();
574 return -ENODEV;
575 }
576
577 err = -EADDRNOTAVAIL;
578 /* changes to the ipv6_mc_list require the socket lock and
579 * rtnl lock. We have the socket lock and rcu read lock,
580 * so reading the list is safe.
581 */
582
583 for_each_pmc_rcu(inet6, pmc) {
584 if (pmc->ifindex != gsf->gf_interface)
585 continue;
586 if (ipv6_addr_equal(group, &pmc->addr))
587 break;
588 }
589 if (!pmc) /* must have a prior join */
590 goto done;
591 gsf->gf_fmode = pmc->sfmode;
592 psl = pmc->sflist;
593 count = psl ? psl->sl_count : 0;
594 read_unlock_bh(&idev->lock);
595 rcu_read_unlock();
596
597 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
598 gsf->gf_numsrc = count;
599 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
600 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
601 return -EFAULT;
602 }
603 /* changes to psl require the socket lock, and a write lock
604 * on pmc->sflock. We have the socket lock so reading here is safe.
605 */
606 for (i = 0; i < copycount; i++) {
607 struct sockaddr_in6 *psin6;
608 struct sockaddr_storage ss;
609
610 psin6 = (struct sockaddr_in6 *)&ss;
611 memset(&ss, 0, sizeof(ss));
612 psin6->sin6_family = AF_INET6;
613 psin6->sin6_addr = psl->sl_addr[i];
614 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
615 return -EFAULT;
616 }
617 return 0;
618 done:
619 read_unlock_bh(&idev->lock);
620 rcu_read_unlock();
621 return err;
622 }
623
624 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
625 const struct in6_addr *src_addr)
626 {
627 struct ipv6_pinfo *np = inet6_sk(sk);
628 struct ipv6_mc_socklist *mc;
629 struct ip6_sf_socklist *psl;
630 bool rv = true;
631
632 rcu_read_lock();
633 for_each_pmc_rcu(np, mc) {
634 if (ipv6_addr_equal(&mc->addr, mc_addr))
635 break;
636 }
637 if (!mc) {
638 rcu_read_unlock();
639 return true;
640 }
641 read_lock(&mc->sflock);
642 psl = mc->sflist;
643 if (!psl) {
644 rv = mc->sfmode == MCAST_EXCLUDE;
645 } else {
646 int i;
647
648 for (i = 0; i < psl->sl_count; i++) {
649 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
650 break;
651 }
652 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
653 rv = false;
654 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
655 rv = false;
656 }
657 read_unlock(&mc->sflock);
658 rcu_read_unlock();
659
660 return rv;
661 }
662
663 static void igmp6_group_added(struct ifmcaddr6 *mc)
664 {
665 struct net_device *dev = mc->idev->dev;
666 char buf[MAX_ADDR_LEN];
667
668 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
669 IPV6_ADDR_SCOPE_LINKLOCAL)
670 return;
671
672 spin_lock_bh(&mc->mca_lock);
673 if (!(mc->mca_flags&MAF_LOADED)) {
674 mc->mca_flags |= MAF_LOADED;
675 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
676 dev_mc_add(dev, buf);
677 }
678 spin_unlock_bh(&mc->mca_lock);
679
680 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
681 return;
682
683 if (mld_in_v1_mode(mc->idev)) {
684 igmp6_join_group(mc);
685 return;
686 }
687 /* else v2 */
688
689 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
690 * should not send filter-mode change record as the mode
691 * should be from IN() to IN(A).
692 */
693 if (mc->mca_sfmode == MCAST_EXCLUDE)
694 mc->mca_crcount = mc->idev->mc_qrv;
695
696 mld_ifc_event(mc->idev);
697 }
698
699 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
700 {
701 struct net_device *dev = mc->idev->dev;
702 char buf[MAX_ADDR_LEN];
703
704 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
705 IPV6_ADDR_SCOPE_LINKLOCAL)
706 return;
707
708 spin_lock_bh(&mc->mca_lock);
709 if (mc->mca_flags&MAF_LOADED) {
710 mc->mca_flags &= ~MAF_LOADED;
711 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
712 dev_mc_del(dev, buf);
713 }
714
715 spin_unlock_bh(&mc->mca_lock);
716 if (mc->mca_flags & MAF_NOREPORT)
717 return;
718
719 if (!mc->idev->dead)
720 igmp6_leave_group(mc);
721
722 spin_lock_bh(&mc->mca_lock);
723 if (del_timer(&mc->mca_timer))
724 refcount_dec(&mc->mca_refcnt);
725 spin_unlock_bh(&mc->mca_lock);
726 }
727
728 /*
729 * deleted ifmcaddr6 manipulation
730 */
731 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
732 {
733 struct ifmcaddr6 *pmc;
734
735 /* this is an "ifmcaddr6" for convenience; only the fields below
736 * are actually used. In particular, the refcnt and users are not
737 * used for management of the delete list. Using the same structure
738 * for deleted items allows change reports to use common code with
739 * non-deleted or query-response MCA's.
740 */
741 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
742 if (!pmc)
743 return;
744
745 spin_lock_bh(&im->mca_lock);
746 spin_lock_init(&pmc->mca_lock);
747 pmc->idev = im->idev;
748 in6_dev_hold(idev);
749 pmc->mca_addr = im->mca_addr;
750 pmc->mca_crcount = idev->mc_qrv;
751 pmc->mca_sfmode = im->mca_sfmode;
752 if (pmc->mca_sfmode == MCAST_INCLUDE) {
753 struct ip6_sf_list *psf;
754
755 pmc->mca_tomb = im->mca_tomb;
756 pmc->mca_sources = im->mca_sources;
757 im->mca_tomb = im->mca_sources = NULL;
758 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
759 psf->sf_crcount = pmc->mca_crcount;
760 }
761 spin_unlock_bh(&im->mca_lock);
762
763 spin_lock_bh(&idev->mc_lock);
764 pmc->next = idev->mc_tomb;
765 idev->mc_tomb = pmc;
766 spin_unlock_bh(&idev->mc_lock);
767 }
768
769 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
770 {
771 struct ifmcaddr6 *pmc, *pmc_prev;
772 struct ip6_sf_list *psf;
773 struct in6_addr *pmca = &im->mca_addr;
774
775 spin_lock_bh(&idev->mc_lock);
776 pmc_prev = NULL;
777 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
779 break;
780 pmc_prev = pmc;
781 }
782 if (pmc) {
783 if (pmc_prev)
784 pmc_prev->next = pmc->next;
785 else
786 idev->mc_tomb = pmc->next;
787 }
788 spin_unlock_bh(&idev->mc_lock);
789
790 spin_lock_bh(&im->mca_lock);
791 if (pmc) {
792 im->idev = pmc->idev;
793 if (im->mca_sfmode == MCAST_INCLUDE) {
794 swap(im->mca_tomb, pmc->mca_tomb);
795 swap(im->mca_sources, pmc->mca_sources);
796 for (psf = im->mca_sources; psf; psf = psf->sf_next)
797 psf->sf_crcount = idev->mc_qrv;
798 } else {
799 im->mca_crcount = idev->mc_qrv;
800 }
801 in6_dev_put(pmc->idev);
802 ip6_mc_clear_src(pmc);
803 kfree(pmc);
804 }
805 spin_unlock_bh(&im->mca_lock);
806 }
807
808 static void mld_clear_delrec(struct inet6_dev *idev)
809 {
810 struct ifmcaddr6 *pmc, *nextpmc;
811
812 spin_lock_bh(&idev->mc_lock);
813 pmc = idev->mc_tomb;
814 idev->mc_tomb = NULL;
815 spin_unlock_bh(&idev->mc_lock);
816
817 for (; pmc; pmc = nextpmc) {
818 nextpmc = pmc->next;
819 ip6_mc_clear_src(pmc);
820 in6_dev_put(pmc->idev);
821 kfree(pmc);
822 }
823
824 /* clear dead sources, too */
825 read_lock_bh(&idev->lock);
826 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
827 struct ip6_sf_list *psf, *psf_next;
828
829 spin_lock_bh(&pmc->mca_lock);
830 psf = pmc->mca_tomb;
831 pmc->mca_tomb = NULL;
832 spin_unlock_bh(&pmc->mca_lock);
833 for (; psf; psf = psf_next) {
834 psf_next = psf->sf_next;
835 kfree(psf);
836 }
837 }
838 read_unlock_bh(&idev->lock);
839 }
840
841 static void mca_get(struct ifmcaddr6 *mc)
842 {
843 refcount_inc(&mc->mca_refcnt);
844 }
845
846 static void ma_put(struct ifmcaddr6 *mc)
847 {
848 if (refcount_dec_and_test(&mc->mca_refcnt)) {
849 in6_dev_put(mc->idev);
850 kfree(mc);
851 }
852 }
853
854 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
855 const struct in6_addr *addr,
856 unsigned int mode)
857 {
858 struct ifmcaddr6 *mc;
859
860 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
861 if (!mc)
862 return NULL;
863
864 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
865
866 mc->mca_addr = *addr;
867 mc->idev = idev; /* reference taken by caller */
868 mc->mca_users = 1;
869 /* mca_stamp should be updated upon changes */
870 mc->mca_cstamp = mc->mca_tstamp = jiffies;
871 refcount_set(&mc->mca_refcnt, 1);
872 spin_lock_init(&mc->mca_lock);
873
874 mc->mca_sfmode = mode;
875 mc->mca_sfcount[mode] = 1;
876
877 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
878 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
879 mc->mca_flags |= MAF_NOREPORT;
880
881 return mc;
882 }
883
884 /*
885 * device multicast group inc (add if not found)
886 */
887 static int __ipv6_dev_mc_inc(struct net_device *dev,
888 const struct in6_addr *addr, unsigned int mode)
889 {
890 struct ifmcaddr6 *mc;
891 struct inet6_dev *idev;
892
893 ASSERT_RTNL();
894
895 /* we need to take a reference on idev */
896 idev = in6_dev_get(dev);
897
898 if (!idev)
899 return -EINVAL;
900
901 write_lock_bh(&idev->lock);
902 if (idev->dead) {
903 write_unlock_bh(&idev->lock);
904 in6_dev_put(idev);
905 return -ENODEV;
906 }
907
908 for (mc = idev->mc_list; mc; mc = mc->next) {
909 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
910 mc->mca_users++;
911 write_unlock_bh(&idev->lock);
912 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
913 in6_dev_put(idev);
914 return 0;
915 }
916 }
917
918 mc = mca_alloc(idev, addr, mode);
919 if (!mc) {
920 write_unlock_bh(&idev->lock);
921 in6_dev_put(idev);
922 return -ENOMEM;
923 }
924
925 mc->next = idev->mc_list;
926 idev->mc_list = mc;
927
928 /* Hold this for the code below before we unlock,
929 * it is already exposed via idev->mc_list.
930 */
931 mca_get(mc);
932 write_unlock_bh(&idev->lock);
933
934 mld_del_delrec(idev, mc);
935 igmp6_group_added(mc);
936 ma_put(mc);
937 return 0;
938 }
939
940 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
941 {
942 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
943 }
944
945 /*
946 * device multicast group del
947 */
948 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
949 {
950 struct ifmcaddr6 *ma, **map;
951
952 ASSERT_RTNL();
953
954 write_lock_bh(&idev->lock);
955 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
956 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
957 if (--ma->mca_users == 0) {
958 *map = ma->next;
959 write_unlock_bh(&idev->lock);
960
961 igmp6_group_dropped(ma);
962 ip6_mc_clear_src(ma);
963
964 ma_put(ma);
965 return 0;
966 }
967 write_unlock_bh(&idev->lock);
968 return 0;
969 }
970 }
971 write_unlock_bh(&idev->lock);
972
973 return -ENOENT;
974 }
975
976 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
977 {
978 struct inet6_dev *idev;
979 int err;
980
981 ASSERT_RTNL();
982
983 idev = __in6_dev_get(dev);
984 if (!idev)
985 err = -ENODEV;
986 else
987 err = __ipv6_dev_mc_dec(idev, addr);
988
989 return err;
990 }
991
992 /*
993 * check if the interface/address pair is valid
994 */
995 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
996 const struct in6_addr *src_addr)
997 {
998 struct inet6_dev *idev;
999 struct ifmcaddr6 *mc;
1000 bool rv = false;
1001
1002 rcu_read_lock();
1003 idev = __in6_dev_get(dev);
1004 if (idev) {
1005 read_lock_bh(&idev->lock);
1006 for (mc = idev->mc_list; mc; mc = mc->next) {
1007 if (ipv6_addr_equal(&mc->mca_addr, group))
1008 break;
1009 }
1010 if (mc) {
1011 if (src_addr && !ipv6_addr_any(src_addr)) {
1012 struct ip6_sf_list *psf;
1013
1014 spin_lock_bh(&mc->mca_lock);
1015 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1016 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1017 break;
1018 }
1019 if (psf)
1020 rv = psf->sf_count[MCAST_INCLUDE] ||
1021 psf->sf_count[MCAST_EXCLUDE] !=
1022 mc->mca_sfcount[MCAST_EXCLUDE];
1023 else
1024 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1025 spin_unlock_bh(&mc->mca_lock);
1026 } else
1027 rv = true; /* don't filter unspecified source */
1028 }
1029 read_unlock_bh(&idev->lock);
1030 }
1031 rcu_read_unlock();
1032 return rv;
1033 }
1034
1035 static void mld_gq_start_timer(struct inet6_dev *idev)
1036 {
1037 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1038
1039 idev->mc_gq_running = 1;
1040 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1041 in6_dev_hold(idev);
1042 }
1043
1044 static void mld_gq_stop_timer(struct inet6_dev *idev)
1045 {
1046 idev->mc_gq_running = 0;
1047 if (del_timer(&idev->mc_gq_timer))
1048 __in6_dev_put(idev);
1049 }
1050
1051 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1052 {
1053 unsigned long tv = prandom_u32() % delay;
1054
1055 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1056 in6_dev_hold(idev);
1057 }
1058
1059 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1060 {
1061 idev->mc_ifc_count = 0;
1062 if (del_timer(&idev->mc_ifc_timer))
1063 __in6_dev_put(idev);
1064 }
1065
1066 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1067 {
1068 unsigned long tv = prandom_u32() % delay;
1069
1070 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1071 in6_dev_hold(idev);
1072 }
1073
1074 static void mld_dad_stop_timer(struct inet6_dev *idev)
1075 {
1076 if (del_timer(&idev->mc_dad_timer))
1077 __in6_dev_put(idev);
1078 }
1079
1080 /*
1081 * IGMP handling (alias multicast ICMPv6 messages)
1082 */
1083
1084 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1085 {
1086 unsigned long delay = resptime;
1087
1088 /* Do not start timer for these addresses */
1089 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1090 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1091 return;
1092
1093 if (del_timer(&ma->mca_timer)) {
1094 refcount_dec(&ma->mca_refcnt);
1095 delay = ma->mca_timer.expires - jiffies;
1096 }
1097
1098 if (delay >= resptime)
1099 delay = prandom_u32() % resptime;
1100
1101 ma->mca_timer.expires = jiffies + delay;
1102 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1103 refcount_inc(&ma->mca_refcnt);
1104 ma->mca_flags |= MAF_TIMER_RUNNING;
1105 }
1106
1107 /* mark EXCLUDE-mode sources */
1108 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1109 const struct in6_addr *srcs)
1110 {
1111 struct ip6_sf_list *psf;
1112 int i, scount;
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 /* skip inactive filters */
1120 if (psf->sf_count[MCAST_INCLUDE] ||
1121 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1122 psf->sf_count[MCAST_EXCLUDE])
1123 break;
1124 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1125 scount++;
1126 break;
1127 }
1128 }
1129 }
1130 pmc->mca_flags &= ~MAF_GSQUERY;
1131 if (scount == nsrcs) /* all sources excluded */
1132 return false;
1133 return true;
1134 }
1135
1136 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1137 const struct in6_addr *srcs)
1138 {
1139 struct ip6_sf_list *psf;
1140 int i, scount;
1141
1142 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1143 return mld_xmarksources(pmc, nsrcs, srcs);
1144
1145 /* mark INCLUDE-mode sources */
1146
1147 scount = 0;
1148 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1149 if (scount == nsrcs)
1150 break;
1151 for (i = 0; i < nsrcs; i++) {
1152 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1153 psf->sf_gsresp = 1;
1154 scount++;
1155 break;
1156 }
1157 }
1158 }
1159 if (!scount) {
1160 pmc->mca_flags &= ~MAF_GSQUERY;
1161 return false;
1162 }
1163 pmc->mca_flags |= MAF_GSQUERY;
1164 return true;
1165 }
1166
1167 static int mld_force_mld_version(const struct inet6_dev *idev)
1168 {
1169 /* Normally, both are 0 here. If enforcement to a particular is
1170 * being used, individual device enforcement will have a lower
1171 * precedence over 'all' device (.../conf/all/force_mld_version).
1172 */
1173
1174 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1175 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1176 else
1177 return idev->cnf.force_mld_version;
1178 }
1179
1180 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1181 {
1182 return mld_force_mld_version(idev) == 2;
1183 }
1184
1185 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1186 {
1187 return mld_force_mld_version(idev) == 1;
1188 }
1189
1190 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1191 {
1192 if (mld_in_v2_mode_only(idev))
1193 return false;
1194 if (mld_in_v1_mode_only(idev))
1195 return true;
1196 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1197 return true;
1198
1199 return false;
1200 }
1201
1202 static void mld_set_v1_mode(struct inet6_dev *idev)
1203 {
1204 /* RFC3810, relevant sections:
1205 * - 9.1. Robustness Variable
1206 * - 9.2. Query Interval
1207 * - 9.3. Query Response Interval
1208 * - 9.12. Older Version Querier Present Timeout
1209 */
1210 unsigned long switchback;
1211
1212 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1213
1214 idev->mc_v1_seen = jiffies + switchback;
1215 }
1216
1217 static void mld_update_qrv(struct inet6_dev *idev,
1218 const struct mld2_query *mlh2)
1219 {
1220 /* RFC3810, relevant sections:
1221 * - 5.1.8. QRV (Querier's Robustness Variable)
1222 * - 9.1. Robustness Variable
1223 */
1224
1225 /* The value of the Robustness Variable MUST NOT be zero,
1226 * and SHOULD NOT be one. Catch this here if we ever run
1227 * into such a case in future.
1228 */
1229 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1230 WARN_ON(idev->mc_qrv == 0);
1231
1232 if (mlh2->mld2q_qrv > 0)
1233 idev->mc_qrv = mlh2->mld2q_qrv;
1234
1235 if (unlikely(idev->mc_qrv < min_qrv)) {
1236 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1237 idev->mc_qrv, min_qrv);
1238 idev->mc_qrv = min_qrv;
1239 }
1240 }
1241
1242 static void mld_update_qi(struct inet6_dev *idev,
1243 const struct mld2_query *mlh2)
1244 {
1245 /* RFC3810, relevant sections:
1246 * - 5.1.9. QQIC (Querier's Query Interval Code)
1247 * - 9.2. Query Interval
1248 * - 9.12. Older Version Querier Present Timeout
1249 * (the [Query Interval] in the last Query received)
1250 */
1251 unsigned long mc_qqi;
1252
1253 if (mlh2->mld2q_qqic < 128) {
1254 mc_qqi = mlh2->mld2q_qqic;
1255 } else {
1256 unsigned long mc_man, mc_exp;
1257
1258 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1259 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1260
1261 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1262 }
1263
1264 idev->mc_qi = mc_qqi * HZ;
1265 }
1266
1267 static void mld_update_qri(struct inet6_dev *idev,
1268 const struct mld2_query *mlh2)
1269 {
1270 /* RFC3810, relevant sections:
1271 * - 5.1.3. Maximum Response Code
1272 * - 9.3. Query Response Interval
1273 */
1274 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1275 }
1276
1277 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1278 unsigned long *max_delay, bool v1_query)
1279 {
1280 unsigned long mldv1_md;
1281
1282 /* Ignore v1 queries */
1283 if (mld_in_v2_mode_only(idev))
1284 return -EINVAL;
1285
1286 mldv1_md = ntohs(mld->mld_maxdelay);
1287
1288 /* When in MLDv1 fallback and a MLDv2 router start-up being
1289 * unaware of current MLDv1 operation, the MRC == MRD mapping
1290 * only works when the exponential algorithm is not being
1291 * used (as MLDv1 is unaware of such things).
1292 *
1293 * According to the RFC author, the MLDv2 implementations
1294 * he's aware of all use a MRC < 32768 on start up queries.
1295 *
1296 * Thus, should we *ever* encounter something else larger
1297 * than that, just assume the maximum possible within our
1298 * reach.
1299 */
1300 if (!v1_query)
1301 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1302
1303 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1304
1305 /* MLDv1 router present: we need to go into v1 mode *only*
1306 * when an MLDv1 query is received as per section 9.12. of
1307 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1308 * queries MUST be of exactly 24 octets.
1309 */
1310 if (v1_query)
1311 mld_set_v1_mode(idev);
1312
1313 /* cancel MLDv2 report timer */
1314 mld_gq_stop_timer(idev);
1315 /* cancel the interface change timer */
1316 mld_ifc_stop_timer(idev);
1317 /* clear deleted report items */
1318 mld_clear_delrec(idev);
1319
1320 return 0;
1321 }
1322
1323 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1324 unsigned long *max_delay)
1325 {
1326 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1327
1328 mld_update_qrv(idev, mld);
1329 mld_update_qi(idev, mld);
1330 mld_update_qri(idev, mld);
1331
1332 idev->mc_maxdelay = *max_delay;
1333
1334 return 0;
1335 }
1336
1337 /* called with rcu_read_lock() */
1338 int igmp6_event_query(struct sk_buff *skb)
1339 {
1340 struct mld2_query *mlh2 = NULL;
1341 struct ifmcaddr6 *ma;
1342 const struct in6_addr *group;
1343 unsigned long max_delay;
1344 struct inet6_dev *idev;
1345 struct mld_msg *mld;
1346 int group_type;
1347 int mark = 0;
1348 int len, err;
1349
1350 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1351 return -EINVAL;
1352
1353 /* compute payload length excluding extension headers */
1354 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1355 len -= skb_network_header_len(skb);
1356
1357 /* RFC3810 6.2
1358 * Upon reception of an MLD message that contains a Query, the node
1359 * checks if the source address of the message is a valid link-local
1360 * address, if the Hop Limit is set to 1, and if the Router Alert
1361 * option is present in the Hop-By-Hop Options header of the IPv6
1362 * packet. If any of these checks fails, the packet is dropped.
1363 */
1364 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1365 ipv6_hdr(skb)->hop_limit != 1 ||
1366 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1367 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1368 return -EINVAL;
1369
1370 idev = __in6_dev_get(skb->dev);
1371 if (!idev)
1372 return 0;
1373
1374 mld = (struct mld_msg *)icmp6_hdr(skb);
1375 group = &mld->mld_mca;
1376 group_type = ipv6_addr_type(group);
1377
1378 if (group_type != IPV6_ADDR_ANY &&
1379 !(group_type&IPV6_ADDR_MULTICAST))
1380 return -EINVAL;
1381
1382 if (len < MLD_V1_QUERY_LEN) {
1383 return -EINVAL;
1384 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1385 err = mld_process_v1(idev, mld, &max_delay,
1386 len == MLD_V1_QUERY_LEN);
1387 if (err < 0)
1388 return err;
1389 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1390 int srcs_offset = sizeof(struct mld2_query) -
1391 sizeof(struct icmp6hdr);
1392
1393 if (!pskb_may_pull(skb, srcs_offset))
1394 return -EINVAL;
1395
1396 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1397
1398 err = mld_process_v2(idev, mlh2, &max_delay);
1399 if (err < 0)
1400 return err;
1401
1402 if (group_type == IPV6_ADDR_ANY) { /* general query */
1403 if (mlh2->mld2q_nsrcs)
1404 return -EINVAL; /* no sources allowed */
1405
1406 mld_gq_start_timer(idev);
1407 return 0;
1408 }
1409 /* mark sources to include, if group & source-specific */
1410 if (mlh2->mld2q_nsrcs != 0) {
1411 if (!pskb_may_pull(skb, srcs_offset +
1412 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1413 return -EINVAL;
1414
1415 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1416 mark = 1;
1417 }
1418 } else {
1419 return -EINVAL;
1420 }
1421
1422 read_lock_bh(&idev->lock);
1423 if (group_type == IPV6_ADDR_ANY) {
1424 for (ma = idev->mc_list; ma; ma = ma->next) {
1425 spin_lock_bh(&ma->mca_lock);
1426 igmp6_group_queried(ma, max_delay);
1427 spin_unlock_bh(&ma->mca_lock);
1428 }
1429 } else {
1430 for (ma = idev->mc_list; ma; ma = ma->next) {
1431 if (!ipv6_addr_equal(group, &ma->mca_addr))
1432 continue;
1433 spin_lock_bh(&ma->mca_lock);
1434 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1435 /* gsquery <- gsquery && mark */
1436 if (!mark)
1437 ma->mca_flags &= ~MAF_GSQUERY;
1438 } else {
1439 /* gsquery <- mark */
1440 if (mark)
1441 ma->mca_flags |= MAF_GSQUERY;
1442 else
1443 ma->mca_flags &= ~MAF_GSQUERY;
1444 }
1445 if (!(ma->mca_flags & MAF_GSQUERY) ||
1446 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1447 igmp6_group_queried(ma, max_delay);
1448 spin_unlock_bh(&ma->mca_lock);
1449 break;
1450 }
1451 }
1452 read_unlock_bh(&idev->lock);
1453
1454 return 0;
1455 }
1456
1457 /* called with rcu_read_lock() */
1458 int igmp6_event_report(struct sk_buff *skb)
1459 {
1460 struct ifmcaddr6 *ma;
1461 struct inet6_dev *idev;
1462 struct mld_msg *mld;
1463 int addr_type;
1464
1465 /* Our own report looped back. Ignore it. */
1466 if (skb->pkt_type == PACKET_LOOPBACK)
1467 return 0;
1468
1469 /* send our report if the MC router may not have heard this report */
1470 if (skb->pkt_type != PACKET_MULTICAST &&
1471 skb->pkt_type != PACKET_BROADCAST)
1472 return 0;
1473
1474 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1475 return -EINVAL;
1476
1477 mld = (struct mld_msg *)icmp6_hdr(skb);
1478
1479 /* Drop reports with not link local source */
1480 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1481 if (addr_type != IPV6_ADDR_ANY &&
1482 !(addr_type&IPV6_ADDR_LINKLOCAL))
1483 return -EINVAL;
1484
1485 idev = __in6_dev_get(skb->dev);
1486 if (!idev)
1487 return -ENODEV;
1488
1489 /*
1490 * Cancel the timer for this group
1491 */
1492
1493 read_lock_bh(&idev->lock);
1494 for (ma = idev->mc_list; ma; ma = ma->next) {
1495 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1496 spin_lock(&ma->mca_lock);
1497 if (del_timer(&ma->mca_timer))
1498 refcount_dec(&ma->mca_refcnt);
1499 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1500 spin_unlock(&ma->mca_lock);
1501 break;
1502 }
1503 }
1504 read_unlock_bh(&idev->lock);
1505 return 0;
1506 }
1507
1508 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1509 int gdeleted, int sdeleted)
1510 {
1511 switch (type) {
1512 case MLD2_MODE_IS_INCLUDE:
1513 case MLD2_MODE_IS_EXCLUDE:
1514 if (gdeleted || sdeleted)
1515 return false;
1516 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1517 if (pmc->mca_sfmode == MCAST_INCLUDE)
1518 return true;
1519 /* don't include if this source is excluded
1520 * in all filters
1521 */
1522 if (psf->sf_count[MCAST_INCLUDE])
1523 return type == MLD2_MODE_IS_INCLUDE;
1524 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1525 psf->sf_count[MCAST_EXCLUDE];
1526 }
1527 return false;
1528 case MLD2_CHANGE_TO_INCLUDE:
1529 if (gdeleted || sdeleted)
1530 return false;
1531 return psf->sf_count[MCAST_INCLUDE] != 0;
1532 case MLD2_CHANGE_TO_EXCLUDE:
1533 if (gdeleted || sdeleted)
1534 return false;
1535 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1536 psf->sf_count[MCAST_INCLUDE])
1537 return false;
1538 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1539 psf->sf_count[MCAST_EXCLUDE];
1540 case MLD2_ALLOW_NEW_SOURCES:
1541 if (gdeleted || !psf->sf_crcount)
1542 return false;
1543 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1544 case MLD2_BLOCK_OLD_SOURCES:
1545 if (pmc->mca_sfmode == MCAST_INCLUDE)
1546 return gdeleted || (psf->sf_crcount && sdeleted);
1547 return psf->sf_crcount && !gdeleted && !sdeleted;
1548 }
1549 return false;
1550 }
1551
1552 static int
1553 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1554 {
1555 struct ip6_sf_list *psf;
1556 int scount = 0;
1557
1558 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1559 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1560 continue;
1561 scount++;
1562 }
1563 return scount;
1564 }
1565
1566 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1567 struct net_device *dev,
1568 const struct in6_addr *saddr,
1569 const struct in6_addr *daddr,
1570 int proto, int len)
1571 {
1572 struct ipv6hdr *hdr;
1573
1574 skb->protocol = htons(ETH_P_IPV6);
1575 skb->dev = dev;
1576
1577 skb_reset_network_header(skb);
1578 skb_put(skb, sizeof(struct ipv6hdr));
1579 hdr = ipv6_hdr(skb);
1580
1581 ip6_flow_hdr(hdr, 0, 0);
1582
1583 hdr->payload_len = htons(len);
1584 hdr->nexthdr = proto;
1585 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1586
1587 hdr->saddr = *saddr;
1588 hdr->daddr = *daddr;
1589 }
1590
1591 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1592 {
1593 struct net_device *dev = idev->dev;
1594 struct net *net = dev_net(dev);
1595 struct sock *sk = net->ipv6.igmp_sk;
1596 struct sk_buff *skb;
1597 struct mld2_report *pmr;
1598 struct in6_addr addr_buf;
1599 const struct in6_addr *saddr;
1600 int hlen = LL_RESERVED_SPACE(dev);
1601 int tlen = dev->needed_tailroom;
1602 unsigned int size = mtu + hlen + tlen;
1603 int err;
1604 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1605 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1606 IPV6_TLV_PADN, 0 };
1607
1608 /* we assume size > sizeof(ra) here */
1609 /* limit our allocations to order-0 page */
1610 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1611 skb = sock_alloc_send_skb(sk, size, 1, &err);
1612
1613 if (!skb)
1614 return NULL;
1615
1616 skb->priority = TC_PRIO_CONTROL;
1617 skb_reserve(skb, hlen);
1618 skb_tailroom_reserve(skb, mtu, tlen);
1619
1620 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1621 /* <draft-ietf-magma-mld-source-05.txt>:
1622 * use unspecified address as the source address
1623 * when a valid link-local address is not available.
1624 */
1625 saddr = &in6addr_any;
1626 } else
1627 saddr = &addr_buf;
1628
1629 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1630
1631 skb_put_data(skb, ra, sizeof(ra));
1632
1633 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1634 skb_put(skb, sizeof(*pmr));
1635 pmr = (struct mld2_report *)skb_transport_header(skb);
1636 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1637 pmr->mld2r_resv1 = 0;
1638 pmr->mld2r_cksum = 0;
1639 pmr->mld2r_resv2 = 0;
1640 pmr->mld2r_ngrec = 0;
1641 return skb;
1642 }
1643
1644 static void mld_sendpack(struct sk_buff *skb)
1645 {
1646 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1647 struct mld2_report *pmr =
1648 (struct mld2_report *)skb_transport_header(skb);
1649 int payload_len, mldlen;
1650 struct inet6_dev *idev;
1651 struct net *net = dev_net(skb->dev);
1652 int err;
1653 struct flowi6 fl6;
1654 struct dst_entry *dst;
1655
1656 rcu_read_lock();
1657 idev = __in6_dev_get(skb->dev);
1658 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1659
1660 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1661 sizeof(*pip6);
1662 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1663 pip6->payload_len = htons(payload_len);
1664
1665 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1666 IPPROTO_ICMPV6,
1667 csum_partial(skb_transport_header(skb),
1668 mldlen, 0));
1669
1670 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1671 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1672 skb->dev->ifindex);
1673 dst = icmp6_dst_alloc(skb->dev, &fl6);
1674
1675 err = 0;
1676 if (IS_ERR(dst)) {
1677 err = PTR_ERR(dst);
1678 dst = NULL;
1679 }
1680 skb_dst_set(skb, dst);
1681 if (err)
1682 goto err_out;
1683
1684 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1685 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1686 dst_output);
1687 out:
1688 if (!err) {
1689 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1690 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1691 } else {
1692 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1693 }
1694
1695 rcu_read_unlock();
1696 return;
1697
1698 err_out:
1699 kfree_skb(skb);
1700 goto out;
1701 }
1702
1703 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1704 {
1705 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1706 }
1707
1708 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1709 int type, struct mld2_grec **ppgr, unsigned int mtu)
1710 {
1711 struct mld2_report *pmr;
1712 struct mld2_grec *pgr;
1713
1714 if (!skb) {
1715 skb = mld_newpack(pmc->idev, mtu);
1716 if (!skb)
1717 return NULL;
1718 }
1719 pgr = skb_put(skb, sizeof(struct mld2_grec));
1720 pgr->grec_type = type;
1721 pgr->grec_auxwords = 0;
1722 pgr->grec_nsrcs = 0;
1723 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1724 pmr = (struct mld2_report *)skb_transport_header(skb);
1725 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1726 *ppgr = pgr;
1727 return skb;
1728 }
1729
1730 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1731
1732 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1733 int type, int gdeleted, int sdeleted, int crsend)
1734 {
1735 struct inet6_dev *idev = pmc->idev;
1736 struct net_device *dev = idev->dev;
1737 struct mld2_report *pmr;
1738 struct mld2_grec *pgr = NULL;
1739 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1740 int scount, stotal, first, isquery, truncate;
1741 unsigned int mtu;
1742
1743 if (pmc->mca_flags & MAF_NOREPORT)
1744 return skb;
1745
1746 mtu = READ_ONCE(dev->mtu);
1747 if (mtu < IPV6_MIN_MTU)
1748 return skb;
1749
1750 isquery = type == MLD2_MODE_IS_INCLUDE ||
1751 type == MLD2_MODE_IS_EXCLUDE;
1752 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1753 type == MLD2_CHANGE_TO_EXCLUDE;
1754
1755 stotal = scount = 0;
1756
1757 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1758
1759 if (!*psf_list)
1760 goto empty_source;
1761
1762 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1763
1764 /* EX and TO_EX get a fresh packet, if needed */
1765 if (truncate) {
1766 if (pmr && pmr->mld2r_ngrec &&
1767 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1768 if (skb)
1769 mld_sendpack(skb);
1770 skb = mld_newpack(idev, mtu);
1771 }
1772 }
1773 first = 1;
1774 psf_prev = NULL;
1775 for (psf = *psf_list; psf; psf = psf_next) {
1776 struct in6_addr *psrc;
1777
1778 psf_next = psf->sf_next;
1779
1780 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1781 psf_prev = psf;
1782 continue;
1783 }
1784
1785 /* Based on RFC3810 6.1. Should not send source-list change
1786 * records when there is a filter mode change.
1787 */
1788 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1789 (!gdeleted && pmc->mca_crcount)) &&
1790 (type == MLD2_ALLOW_NEW_SOURCES ||
1791 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1792 goto decrease_sf_crcount;
1793
1794 /* clear marks on query responses */
1795 if (isquery)
1796 psf->sf_gsresp = 0;
1797
1798 if (AVAILABLE(skb) < sizeof(*psrc) +
1799 first*sizeof(struct mld2_grec)) {
1800 if (truncate && !first)
1801 break; /* truncate these */
1802 if (pgr)
1803 pgr->grec_nsrcs = htons(scount);
1804 if (skb)
1805 mld_sendpack(skb);
1806 skb = mld_newpack(idev, mtu);
1807 first = 1;
1808 scount = 0;
1809 }
1810 if (first) {
1811 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1812 first = 0;
1813 }
1814 if (!skb)
1815 return NULL;
1816 psrc = skb_put(skb, sizeof(*psrc));
1817 *psrc = psf->sf_addr;
1818 scount++; stotal++;
1819 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1820 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1821 decrease_sf_crcount:
1822 psf->sf_crcount--;
1823 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1824 if (psf_prev)
1825 psf_prev->sf_next = psf->sf_next;
1826 else
1827 *psf_list = psf->sf_next;
1828 kfree(psf);
1829 continue;
1830 }
1831 }
1832 psf_prev = psf;
1833 }
1834
1835 empty_source:
1836 if (!stotal) {
1837 if (type == MLD2_ALLOW_NEW_SOURCES ||
1838 type == MLD2_BLOCK_OLD_SOURCES)
1839 return skb;
1840 if (pmc->mca_crcount || isquery || crsend) {
1841 /* make sure we have room for group header */
1842 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1843 mld_sendpack(skb);
1844 skb = NULL; /* add_grhead will get a new one */
1845 }
1846 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1847 }
1848 }
1849 if (pgr)
1850 pgr->grec_nsrcs = htons(scount);
1851
1852 if (isquery)
1853 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1854 return skb;
1855 }
1856
1857 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1858 {
1859 struct sk_buff *skb = NULL;
1860 int type;
1861
1862 read_lock_bh(&idev->lock);
1863 if (!pmc) {
1864 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1865 if (pmc->mca_flags & MAF_NOREPORT)
1866 continue;
1867 spin_lock_bh(&pmc->mca_lock);
1868 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1869 type = MLD2_MODE_IS_EXCLUDE;
1870 else
1871 type = MLD2_MODE_IS_INCLUDE;
1872 skb = add_grec(skb, pmc, type, 0, 0, 0);
1873 spin_unlock_bh(&pmc->mca_lock);
1874 }
1875 } else {
1876 spin_lock_bh(&pmc->mca_lock);
1877 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1878 type = MLD2_MODE_IS_EXCLUDE;
1879 else
1880 type = MLD2_MODE_IS_INCLUDE;
1881 skb = add_grec(skb, pmc, type, 0, 0, 0);
1882 spin_unlock_bh(&pmc->mca_lock);
1883 }
1884 read_unlock_bh(&idev->lock);
1885 if (skb)
1886 mld_sendpack(skb);
1887 }
1888
1889 /*
1890 * remove zero-count source records from a source filter list
1891 */
1892 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1893 {
1894 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1895
1896 psf_prev = NULL;
1897 for (psf = *ppsf; psf; psf = psf_next) {
1898 psf_next = psf->sf_next;
1899 if (psf->sf_crcount == 0) {
1900 if (psf_prev)
1901 psf_prev->sf_next = psf->sf_next;
1902 else
1903 *ppsf = psf->sf_next;
1904 kfree(psf);
1905 } else
1906 psf_prev = psf;
1907 }
1908 }
1909
1910 static void mld_send_cr(struct inet6_dev *idev)
1911 {
1912 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1913 struct sk_buff *skb = NULL;
1914 int type, dtype;
1915
1916 read_lock_bh(&idev->lock);
1917 spin_lock(&idev->mc_lock);
1918
1919 /* deleted MCA's */
1920 pmc_prev = NULL;
1921 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1922 pmc_next = pmc->next;
1923 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1924 type = MLD2_BLOCK_OLD_SOURCES;
1925 dtype = MLD2_BLOCK_OLD_SOURCES;
1926 skb = add_grec(skb, pmc, type, 1, 0, 0);
1927 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1928 }
1929 if (pmc->mca_crcount) {
1930 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1931 type = MLD2_CHANGE_TO_INCLUDE;
1932 skb = add_grec(skb, pmc, type, 1, 0, 0);
1933 }
1934 pmc->mca_crcount--;
1935 if (pmc->mca_crcount == 0) {
1936 mld_clear_zeros(&pmc->mca_tomb);
1937 mld_clear_zeros(&pmc->mca_sources);
1938 }
1939 }
1940 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1941 !pmc->mca_sources) {
1942 if (pmc_prev)
1943 pmc_prev->next = pmc_next;
1944 else
1945 idev->mc_tomb = pmc_next;
1946 in6_dev_put(pmc->idev);
1947 kfree(pmc);
1948 } else
1949 pmc_prev = pmc;
1950 }
1951 spin_unlock(&idev->mc_lock);
1952
1953 /* change recs */
1954 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1955 spin_lock_bh(&pmc->mca_lock);
1956 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1957 type = MLD2_BLOCK_OLD_SOURCES;
1958 dtype = MLD2_ALLOW_NEW_SOURCES;
1959 } else {
1960 type = MLD2_ALLOW_NEW_SOURCES;
1961 dtype = MLD2_BLOCK_OLD_SOURCES;
1962 }
1963 skb = add_grec(skb, pmc, type, 0, 0, 0);
1964 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1965
1966 /* filter mode changes */
1967 if (pmc->mca_crcount) {
1968 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1969 type = MLD2_CHANGE_TO_EXCLUDE;
1970 else
1971 type = MLD2_CHANGE_TO_INCLUDE;
1972 skb = add_grec(skb, pmc, type, 0, 0, 0);
1973 pmc->mca_crcount--;
1974 }
1975 spin_unlock_bh(&pmc->mca_lock);
1976 }
1977 read_unlock_bh(&idev->lock);
1978 if (!skb)
1979 return;
1980 (void) mld_sendpack(skb);
1981 }
1982
1983 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1984 {
1985 struct net *net = dev_net(dev);
1986 struct sock *sk = net->ipv6.igmp_sk;
1987 struct inet6_dev *idev;
1988 struct sk_buff *skb;
1989 struct mld_msg *hdr;
1990 const struct in6_addr *snd_addr, *saddr;
1991 struct in6_addr addr_buf;
1992 int hlen = LL_RESERVED_SPACE(dev);
1993 int tlen = dev->needed_tailroom;
1994 int err, len, payload_len, full_len;
1995 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1996 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1997 IPV6_TLV_PADN, 0 };
1998 struct flowi6 fl6;
1999 struct dst_entry *dst;
2000
2001 if (type == ICMPV6_MGM_REDUCTION)
2002 snd_addr = &in6addr_linklocal_allrouters;
2003 else
2004 snd_addr = addr;
2005
2006 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2007 payload_len = len + sizeof(ra);
2008 full_len = sizeof(struct ipv6hdr) + payload_len;
2009
2010 rcu_read_lock();
2011 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2012 IPSTATS_MIB_OUT, full_len);
2013 rcu_read_unlock();
2014
2015 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2016
2017 if (!skb) {
2018 rcu_read_lock();
2019 IP6_INC_STATS(net, __in6_dev_get(dev),
2020 IPSTATS_MIB_OUTDISCARDS);
2021 rcu_read_unlock();
2022 return;
2023 }
2024 skb->priority = TC_PRIO_CONTROL;
2025 skb_reserve(skb, hlen);
2026
2027 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2028 /* <draft-ietf-magma-mld-source-05.txt>:
2029 * use unspecified address as the source address
2030 * when a valid link-local address is not available.
2031 */
2032 saddr = &in6addr_any;
2033 } else
2034 saddr = &addr_buf;
2035
2036 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2037
2038 skb_put_data(skb, ra, sizeof(ra));
2039
2040 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2041 hdr->mld_type = type;
2042 hdr->mld_mca = *addr;
2043
2044 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2045 IPPROTO_ICMPV6,
2046 csum_partial(hdr, len, 0));
2047
2048 rcu_read_lock();
2049 idev = __in6_dev_get(skb->dev);
2050
2051 icmpv6_flow_init(sk, &fl6, type,
2052 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2053 skb->dev->ifindex);
2054 dst = icmp6_dst_alloc(skb->dev, &fl6);
2055 if (IS_ERR(dst)) {
2056 err = PTR_ERR(dst);
2057 goto err_out;
2058 }
2059
2060 skb_dst_set(skb, dst);
2061 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2062 net, sk, skb, NULL, skb->dev,
2063 dst_output);
2064 out:
2065 if (!err) {
2066 ICMP6MSGOUT_INC_STATS(net, idev, type);
2067 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2068 } else
2069 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2070
2071 rcu_read_unlock();
2072 return;
2073
2074 err_out:
2075 kfree_skb(skb);
2076 goto out;
2077 }
2078
2079 static void mld_send_initial_cr(struct inet6_dev *idev)
2080 {
2081 struct sk_buff *skb;
2082 struct ifmcaddr6 *pmc;
2083 int type;
2084
2085 if (mld_in_v1_mode(idev))
2086 return;
2087
2088 skb = NULL;
2089 read_lock_bh(&idev->lock);
2090 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2091 spin_lock_bh(&pmc->mca_lock);
2092 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2093 type = MLD2_CHANGE_TO_EXCLUDE;
2094 else
2095 type = MLD2_ALLOW_NEW_SOURCES;
2096 skb = add_grec(skb, pmc, type, 0, 0, 1);
2097 spin_unlock_bh(&pmc->mca_lock);
2098 }
2099 read_unlock_bh(&idev->lock);
2100 if (skb)
2101 mld_sendpack(skb);
2102 }
2103
2104 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2105 {
2106 idev->mc_dad_count = idev->mc_qrv;
2107 if (idev->mc_dad_count) {
2108 mld_send_initial_cr(idev);
2109 idev->mc_dad_count--;
2110 if (idev->mc_dad_count)
2111 mld_dad_start_timer(idev,
2112 unsolicited_report_interval(idev));
2113 }
2114 }
2115
2116 static void mld_dad_timer_expire(struct timer_list *t)
2117 {
2118 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2119
2120 mld_send_initial_cr(idev);
2121 if (idev->mc_dad_count) {
2122 idev->mc_dad_count--;
2123 if (idev->mc_dad_count)
2124 mld_dad_start_timer(idev,
2125 unsolicited_report_interval(idev));
2126 }
2127 in6_dev_put(idev);
2128 }
2129
2130 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2131 const struct in6_addr *psfsrc)
2132 {
2133 struct ip6_sf_list *psf, *psf_prev;
2134 int rv = 0;
2135
2136 psf_prev = NULL;
2137 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2138 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2139 break;
2140 psf_prev = psf;
2141 }
2142 if (!psf || psf->sf_count[sfmode] == 0) {
2143 /* source filter not found, or count wrong => bug */
2144 return -ESRCH;
2145 }
2146 psf->sf_count[sfmode]--;
2147 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2148 struct inet6_dev *idev = pmc->idev;
2149
2150 /* no more filters for this source */
2151 if (psf_prev)
2152 psf_prev->sf_next = psf->sf_next;
2153 else
2154 pmc->mca_sources = psf->sf_next;
2155 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2156 !mld_in_v1_mode(idev)) {
2157 psf->sf_crcount = idev->mc_qrv;
2158 psf->sf_next = pmc->mca_tomb;
2159 pmc->mca_tomb = psf;
2160 rv = 1;
2161 } else
2162 kfree(psf);
2163 }
2164 return rv;
2165 }
2166
2167 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2168 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2169 int delta)
2170 {
2171 struct ifmcaddr6 *pmc;
2172 int changerec = 0;
2173 int i, err;
2174
2175 if (!idev)
2176 return -ENODEV;
2177 read_lock_bh(&idev->lock);
2178 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2179 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2180 break;
2181 }
2182 if (!pmc) {
2183 /* MCA not found?? bug */
2184 read_unlock_bh(&idev->lock);
2185 return -ESRCH;
2186 }
2187 spin_lock_bh(&pmc->mca_lock);
2188 sf_markstate(pmc);
2189 if (!delta) {
2190 if (!pmc->mca_sfcount[sfmode]) {
2191 spin_unlock_bh(&pmc->mca_lock);
2192 read_unlock_bh(&idev->lock);
2193 return -EINVAL;
2194 }
2195 pmc->mca_sfcount[sfmode]--;
2196 }
2197 err = 0;
2198 for (i = 0; i < sfcount; i++) {
2199 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2200
2201 changerec |= rv > 0;
2202 if (!err && rv < 0)
2203 err = rv;
2204 }
2205 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2206 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2207 pmc->mca_sfcount[MCAST_INCLUDE]) {
2208 struct ip6_sf_list *psf;
2209
2210 /* filter mode change */
2211 pmc->mca_sfmode = MCAST_INCLUDE;
2212 pmc->mca_crcount = idev->mc_qrv;
2213 idev->mc_ifc_count = pmc->mca_crcount;
2214 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2215 psf->sf_crcount = 0;
2216 mld_ifc_event(pmc->idev);
2217 } else if (sf_setstate(pmc) || changerec)
2218 mld_ifc_event(pmc->idev);
2219 spin_unlock_bh(&pmc->mca_lock);
2220 read_unlock_bh(&idev->lock);
2221 return err;
2222 }
2223
2224 /*
2225 * Add multicast single-source filter to the interface list
2226 */
2227 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2228 const struct in6_addr *psfsrc)
2229 {
2230 struct ip6_sf_list *psf, *psf_prev;
2231
2232 psf_prev = NULL;
2233 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2234 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2235 break;
2236 psf_prev = psf;
2237 }
2238 if (!psf) {
2239 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2240 if (!psf)
2241 return -ENOBUFS;
2242
2243 psf->sf_addr = *psfsrc;
2244 if (psf_prev) {
2245 psf_prev->sf_next = psf;
2246 } else
2247 pmc->mca_sources = psf;
2248 }
2249 psf->sf_count[sfmode]++;
2250 return 0;
2251 }
2252
2253 static void sf_markstate(struct ifmcaddr6 *pmc)
2254 {
2255 struct ip6_sf_list *psf;
2256 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2257
2258 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2259 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2260 psf->sf_oldin = mca_xcount ==
2261 psf->sf_count[MCAST_EXCLUDE] &&
2262 !psf->sf_count[MCAST_INCLUDE];
2263 } else
2264 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2265 }
2266
2267 static int sf_setstate(struct ifmcaddr6 *pmc)
2268 {
2269 struct ip6_sf_list *psf, *dpsf;
2270 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2271 int qrv = pmc->idev->mc_qrv;
2272 int new_in, rv;
2273
2274 rv = 0;
2275 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2276 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2277 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2278 !psf->sf_count[MCAST_INCLUDE];
2279 } else
2280 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2281 if (new_in) {
2282 if (!psf->sf_oldin) {
2283 struct ip6_sf_list *prev = NULL;
2284
2285 for (dpsf = pmc->mca_tomb; dpsf;
2286 dpsf = dpsf->sf_next) {
2287 if (ipv6_addr_equal(&dpsf->sf_addr,
2288 &psf->sf_addr))
2289 break;
2290 prev = dpsf;
2291 }
2292 if (dpsf) {
2293 if (prev)
2294 prev->sf_next = dpsf->sf_next;
2295 else
2296 pmc->mca_tomb = dpsf->sf_next;
2297 kfree(dpsf);
2298 }
2299 psf->sf_crcount = qrv;
2300 rv++;
2301 }
2302 } else if (psf->sf_oldin) {
2303 psf->sf_crcount = 0;
2304 /*
2305 * add or update "delete" records if an active filter
2306 * is now inactive
2307 */
2308 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2309 if (ipv6_addr_equal(&dpsf->sf_addr,
2310 &psf->sf_addr))
2311 break;
2312 if (!dpsf) {
2313 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2314 if (!dpsf)
2315 continue;
2316 *dpsf = *psf;
2317 /* pmc->mca_lock held by callers */
2318 dpsf->sf_next = pmc->mca_tomb;
2319 pmc->mca_tomb = dpsf;
2320 }
2321 dpsf->sf_crcount = qrv;
2322 rv++;
2323 }
2324 }
2325 return rv;
2326 }
2327
2328 /*
2329 * Add multicast source filter list to the interface list
2330 */
2331 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2332 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2333 int delta)
2334 {
2335 struct ifmcaddr6 *pmc;
2336 int isexclude;
2337 int i, err;
2338
2339 if (!idev)
2340 return -ENODEV;
2341 read_lock_bh(&idev->lock);
2342 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2343 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2344 break;
2345 }
2346 if (!pmc) {
2347 /* MCA not found?? bug */
2348 read_unlock_bh(&idev->lock);
2349 return -ESRCH;
2350 }
2351 spin_lock_bh(&pmc->mca_lock);
2352
2353 sf_markstate(pmc);
2354 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2355 if (!delta)
2356 pmc->mca_sfcount[sfmode]++;
2357 err = 0;
2358 for (i = 0; i < sfcount; i++) {
2359 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2360 if (err)
2361 break;
2362 }
2363 if (err) {
2364 int j;
2365
2366 if (!delta)
2367 pmc->mca_sfcount[sfmode]--;
2368 for (j = 0; j < i; j++)
2369 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2370 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2371 struct ip6_sf_list *psf;
2372
2373 /* filter mode change */
2374 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2375 pmc->mca_sfmode = MCAST_EXCLUDE;
2376 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2377 pmc->mca_sfmode = MCAST_INCLUDE;
2378 /* else no filters; keep old mode for reports */
2379
2380 pmc->mca_crcount = idev->mc_qrv;
2381 idev->mc_ifc_count = pmc->mca_crcount;
2382 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2383 psf->sf_crcount = 0;
2384 mld_ifc_event(idev);
2385 } else if (sf_setstate(pmc))
2386 mld_ifc_event(idev);
2387 spin_unlock_bh(&pmc->mca_lock);
2388 read_unlock_bh(&idev->lock);
2389 return err;
2390 }
2391
2392 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2393 {
2394 struct ip6_sf_list *psf, *nextpsf;
2395
2396 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2397 nextpsf = psf->sf_next;
2398 kfree(psf);
2399 }
2400 pmc->mca_tomb = NULL;
2401 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2402 nextpsf = psf->sf_next;
2403 kfree(psf);
2404 }
2405 pmc->mca_sources = NULL;
2406 pmc->mca_sfmode = MCAST_EXCLUDE;
2407 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2408 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2409 }
2410
2411
2412 static void igmp6_join_group(struct ifmcaddr6 *ma)
2413 {
2414 unsigned long delay;
2415
2416 if (ma->mca_flags & MAF_NOREPORT)
2417 return;
2418
2419 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2420
2421 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2422
2423 spin_lock_bh(&ma->mca_lock);
2424 if (del_timer(&ma->mca_timer)) {
2425 refcount_dec(&ma->mca_refcnt);
2426 delay = ma->mca_timer.expires - jiffies;
2427 }
2428
2429 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2430 refcount_inc(&ma->mca_refcnt);
2431 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2432 spin_unlock_bh(&ma->mca_lock);
2433 }
2434
2435 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2436 struct inet6_dev *idev)
2437 {
2438 int err;
2439
2440 write_lock_bh(&iml->sflock);
2441 if (!iml->sflist) {
2442 /* any-source empty exclude case */
2443 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2444 } else {
2445 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2446 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2447 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2448 iml->sflist = NULL;
2449 }
2450 write_unlock_bh(&iml->sflock);
2451 return err;
2452 }
2453
2454 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2455 {
2456 if (mld_in_v1_mode(ma->idev)) {
2457 if (ma->mca_flags & MAF_LAST_REPORTER)
2458 igmp6_send(&ma->mca_addr, ma->idev->dev,
2459 ICMPV6_MGM_REDUCTION);
2460 } else {
2461 mld_add_delrec(ma->idev, ma);
2462 mld_ifc_event(ma->idev);
2463 }
2464 }
2465
2466 static void mld_gq_timer_expire(struct timer_list *t)
2467 {
2468 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2469
2470 idev->mc_gq_running = 0;
2471 mld_send_report(idev, NULL);
2472 in6_dev_put(idev);
2473 }
2474
2475 static void mld_ifc_timer_expire(struct timer_list *t)
2476 {
2477 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2478
2479 mld_send_cr(idev);
2480 if (idev->mc_ifc_count) {
2481 idev->mc_ifc_count--;
2482 if (idev->mc_ifc_count)
2483 mld_ifc_start_timer(idev,
2484 unsolicited_report_interval(idev));
2485 }
2486 in6_dev_put(idev);
2487 }
2488
2489 static void mld_ifc_event(struct inet6_dev *idev)
2490 {
2491 if (mld_in_v1_mode(idev))
2492 return;
2493 idev->mc_ifc_count = idev->mc_qrv;
2494 mld_ifc_start_timer(idev, 1);
2495 }
2496
2497 static void igmp6_timer_handler(struct timer_list *t)
2498 {
2499 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2500
2501 if (mld_in_v1_mode(ma->idev))
2502 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2503 else
2504 mld_send_report(ma->idev, ma);
2505
2506 spin_lock(&ma->mca_lock);
2507 ma->mca_flags |= MAF_LAST_REPORTER;
2508 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2509 spin_unlock(&ma->mca_lock);
2510 ma_put(ma);
2511 }
2512
2513 /* Device changing type */
2514
2515 void ipv6_mc_unmap(struct inet6_dev *idev)
2516 {
2517 struct ifmcaddr6 *i;
2518
2519 /* Install multicast list, except for all-nodes (already installed) */
2520
2521 read_lock_bh(&idev->lock);
2522 for (i = idev->mc_list; i; i = i->next)
2523 igmp6_group_dropped(i);
2524 read_unlock_bh(&idev->lock);
2525 }
2526
2527 void ipv6_mc_remap(struct inet6_dev *idev)
2528 {
2529 ipv6_mc_up(idev);
2530 }
2531
2532 /* Device going down */
2533
2534 void ipv6_mc_down(struct inet6_dev *idev)
2535 {
2536 struct ifmcaddr6 *i;
2537
2538 /* Withdraw multicast list */
2539
2540 read_lock_bh(&idev->lock);
2541
2542 for (i = idev->mc_list; i; i = i->next)
2543 igmp6_group_dropped(i);
2544
2545 /* Should stop timer after group drop. or we will
2546 * start timer again in mld_ifc_event()
2547 */
2548 mld_ifc_stop_timer(idev);
2549 mld_gq_stop_timer(idev);
2550 mld_dad_stop_timer(idev);
2551 read_unlock_bh(&idev->lock);
2552 }
2553
2554 static void ipv6_mc_reset(struct inet6_dev *idev)
2555 {
2556 idev->mc_qrv = sysctl_mld_qrv;
2557 idev->mc_qi = MLD_QI_DEFAULT;
2558 idev->mc_qri = MLD_QRI_DEFAULT;
2559 idev->mc_v1_seen = 0;
2560 idev->mc_maxdelay = unsolicited_report_interval(idev);
2561 }
2562
2563 /* Device going up */
2564
2565 void ipv6_mc_up(struct inet6_dev *idev)
2566 {
2567 struct ifmcaddr6 *i;
2568
2569 /* Install multicast list, except for all-nodes (already installed) */
2570
2571 read_lock_bh(&idev->lock);
2572 ipv6_mc_reset(idev);
2573 for (i = idev->mc_list; i; i = i->next) {
2574 mld_del_delrec(idev, i);
2575 igmp6_group_added(i);
2576 }
2577 read_unlock_bh(&idev->lock);
2578 }
2579
2580 /* IPv6 device initialization. */
2581
2582 void ipv6_mc_init_dev(struct inet6_dev *idev)
2583 {
2584 write_lock_bh(&idev->lock);
2585 spin_lock_init(&idev->mc_lock);
2586 idev->mc_gq_running = 0;
2587 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2588 idev->mc_tomb = NULL;
2589 idev->mc_ifc_count = 0;
2590 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2591 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2592 ipv6_mc_reset(idev);
2593 write_unlock_bh(&idev->lock);
2594 }
2595
2596 /*
2597 * Device is about to be destroyed: clean up.
2598 */
2599
2600 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2601 {
2602 struct ifmcaddr6 *i;
2603
2604 /* Deactivate timers */
2605 ipv6_mc_down(idev);
2606 mld_clear_delrec(idev);
2607
2608 /* Delete all-nodes address. */
2609 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2610 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2611 * fail.
2612 */
2613 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2614
2615 if (idev->cnf.forwarding)
2616 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2617
2618 write_lock_bh(&idev->lock);
2619 while ((i = idev->mc_list) != NULL) {
2620 idev->mc_list = i->next;
2621
2622 write_unlock_bh(&idev->lock);
2623 ip6_mc_clear_src(i);
2624 ma_put(i);
2625 write_lock_bh(&idev->lock);
2626 }
2627 write_unlock_bh(&idev->lock);
2628 }
2629
2630 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2631 {
2632 struct ifmcaddr6 *pmc;
2633
2634 ASSERT_RTNL();
2635
2636 if (mld_in_v1_mode(idev)) {
2637 read_lock_bh(&idev->lock);
2638 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2639 igmp6_join_group(pmc);
2640 read_unlock_bh(&idev->lock);
2641 } else
2642 mld_send_report(idev, NULL);
2643 }
2644
2645 static int ipv6_mc_netdev_event(struct notifier_block *this,
2646 unsigned long event,
2647 void *ptr)
2648 {
2649 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2650 struct inet6_dev *idev = __in6_dev_get(dev);
2651
2652 switch (event) {
2653 case NETDEV_RESEND_IGMP:
2654 if (idev)
2655 ipv6_mc_rejoin_groups(idev);
2656 break;
2657 default:
2658 break;
2659 }
2660
2661 return NOTIFY_DONE;
2662 }
2663
2664 static struct notifier_block igmp6_netdev_notifier = {
2665 .notifier_call = ipv6_mc_netdev_event,
2666 };
2667
2668 #ifdef CONFIG_PROC_FS
2669 struct igmp6_mc_iter_state {
2670 struct seq_net_private p;
2671 struct net_device *dev;
2672 struct inet6_dev *idev;
2673 };
2674
2675 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2676
2677 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2678 {
2679 struct ifmcaddr6 *im = NULL;
2680 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2681 struct net *net = seq_file_net(seq);
2682
2683 state->idev = NULL;
2684 for_each_netdev_rcu(net, state->dev) {
2685 struct inet6_dev *idev;
2686 idev = __in6_dev_get(state->dev);
2687 if (!idev)
2688 continue;
2689 read_lock_bh(&idev->lock);
2690 im = idev->mc_list;
2691 if (im) {
2692 state->idev = idev;
2693 break;
2694 }
2695 read_unlock_bh(&idev->lock);
2696 }
2697 return im;
2698 }
2699
2700 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2701 {
2702 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2703
2704 im = im->next;
2705 while (!im) {
2706 if (likely(state->idev))
2707 read_unlock_bh(&state->idev->lock);
2708
2709 state->dev = next_net_device_rcu(state->dev);
2710 if (!state->dev) {
2711 state->idev = NULL;
2712 break;
2713 }
2714 state->idev = __in6_dev_get(state->dev);
2715 if (!state->idev)
2716 continue;
2717 read_lock_bh(&state->idev->lock);
2718 im = state->idev->mc_list;
2719 }
2720 return im;
2721 }
2722
2723 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2724 {
2725 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2726 if (im)
2727 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2728 --pos;
2729 return pos ? NULL : im;
2730 }
2731
2732 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2733 __acquires(RCU)
2734 {
2735 rcu_read_lock();
2736 return igmp6_mc_get_idx(seq, *pos);
2737 }
2738
2739 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2740 {
2741 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2742
2743 ++*pos;
2744 return im;
2745 }
2746
2747 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2748 __releases(RCU)
2749 {
2750 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2751
2752 if (likely(state->idev)) {
2753 read_unlock_bh(&state->idev->lock);
2754 state->idev = NULL;
2755 }
2756 state->dev = NULL;
2757 rcu_read_unlock();
2758 }
2759
2760 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2761 {
2762 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2763 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2764
2765 seq_printf(seq,
2766 "%-4d %-15s %pi6 %5d %08X %ld\n",
2767 state->dev->ifindex, state->dev->name,
2768 &im->mca_addr,
2769 im->mca_users, im->mca_flags,
2770 (im->mca_flags&MAF_TIMER_RUNNING) ?
2771 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2772 return 0;
2773 }
2774
2775 static const struct seq_operations igmp6_mc_seq_ops = {
2776 .start = igmp6_mc_seq_start,
2777 .next = igmp6_mc_seq_next,
2778 .stop = igmp6_mc_seq_stop,
2779 .show = igmp6_mc_seq_show,
2780 };
2781
2782 struct igmp6_mcf_iter_state {
2783 struct seq_net_private p;
2784 struct net_device *dev;
2785 struct inet6_dev *idev;
2786 struct ifmcaddr6 *im;
2787 };
2788
2789 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2790
2791 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2792 {
2793 struct ip6_sf_list *psf = NULL;
2794 struct ifmcaddr6 *im = NULL;
2795 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2796 struct net *net = seq_file_net(seq);
2797
2798 state->idev = NULL;
2799 state->im = NULL;
2800 for_each_netdev_rcu(net, state->dev) {
2801 struct inet6_dev *idev;
2802 idev = __in6_dev_get(state->dev);
2803 if (unlikely(idev == NULL))
2804 continue;
2805 read_lock_bh(&idev->lock);
2806 im = idev->mc_list;
2807 if (likely(im)) {
2808 spin_lock_bh(&im->mca_lock);
2809 psf = im->mca_sources;
2810 if (likely(psf)) {
2811 state->im = im;
2812 state->idev = idev;
2813 break;
2814 }
2815 spin_unlock_bh(&im->mca_lock);
2816 }
2817 read_unlock_bh(&idev->lock);
2818 }
2819 return psf;
2820 }
2821
2822 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2823 {
2824 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2825
2826 psf = psf->sf_next;
2827 while (!psf) {
2828 spin_unlock_bh(&state->im->mca_lock);
2829 state->im = state->im->next;
2830 while (!state->im) {
2831 if (likely(state->idev))
2832 read_unlock_bh(&state->idev->lock);
2833
2834 state->dev = next_net_device_rcu(state->dev);
2835 if (!state->dev) {
2836 state->idev = NULL;
2837 goto out;
2838 }
2839 state->idev = __in6_dev_get(state->dev);
2840 if (!state->idev)
2841 continue;
2842 read_lock_bh(&state->idev->lock);
2843 state->im = state->idev->mc_list;
2844 }
2845 if (!state->im)
2846 break;
2847 spin_lock_bh(&state->im->mca_lock);
2848 psf = state->im->mca_sources;
2849 }
2850 out:
2851 return psf;
2852 }
2853
2854 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2855 {
2856 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2857 if (psf)
2858 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2859 --pos;
2860 return pos ? NULL : psf;
2861 }
2862
2863 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2864 __acquires(RCU)
2865 {
2866 rcu_read_lock();
2867 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2868 }
2869
2870 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2871 {
2872 struct ip6_sf_list *psf;
2873 if (v == SEQ_START_TOKEN)
2874 psf = igmp6_mcf_get_first(seq);
2875 else
2876 psf = igmp6_mcf_get_next(seq, v);
2877 ++*pos;
2878 return psf;
2879 }
2880
2881 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2882 __releases(RCU)
2883 {
2884 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2885 if (likely(state->im)) {
2886 spin_unlock_bh(&state->im->mca_lock);
2887 state->im = NULL;
2888 }
2889 if (likely(state->idev)) {
2890 read_unlock_bh(&state->idev->lock);
2891 state->idev = NULL;
2892 }
2893 state->dev = NULL;
2894 rcu_read_unlock();
2895 }
2896
2897 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2898 {
2899 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2900 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2901
2902 if (v == SEQ_START_TOKEN) {
2903 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2904 } else {
2905 seq_printf(seq,
2906 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2907 state->dev->ifindex, state->dev->name,
2908 &state->im->mca_addr,
2909 &psf->sf_addr,
2910 psf->sf_count[MCAST_INCLUDE],
2911 psf->sf_count[MCAST_EXCLUDE]);
2912 }
2913 return 0;
2914 }
2915
2916 static const struct seq_operations igmp6_mcf_seq_ops = {
2917 .start = igmp6_mcf_seq_start,
2918 .next = igmp6_mcf_seq_next,
2919 .stop = igmp6_mcf_seq_stop,
2920 .show = igmp6_mcf_seq_show,
2921 };
2922
2923 static int __net_init igmp6_proc_init(struct net *net)
2924 {
2925 int err;
2926
2927 err = -ENOMEM;
2928 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
2929 sizeof(struct igmp6_mc_iter_state)))
2930 goto out;
2931 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
2932 &igmp6_mcf_seq_ops,
2933 sizeof(struct igmp6_mcf_iter_state)))
2934 goto out_proc_net_igmp6;
2935
2936 err = 0;
2937 out:
2938 return err;
2939
2940 out_proc_net_igmp6:
2941 remove_proc_entry("igmp6", net->proc_net);
2942 goto out;
2943 }
2944
2945 static void __net_exit igmp6_proc_exit(struct net *net)
2946 {
2947 remove_proc_entry("mcfilter6", net->proc_net);
2948 remove_proc_entry("igmp6", net->proc_net);
2949 }
2950 #else
2951 static inline int igmp6_proc_init(struct net *net)
2952 {
2953 return 0;
2954 }
2955 static inline void igmp6_proc_exit(struct net *net)
2956 {
2957 }
2958 #endif
2959
2960 static int __net_init igmp6_net_init(struct net *net)
2961 {
2962 int err;
2963
2964 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2965 SOCK_RAW, IPPROTO_ICMPV6, net);
2966 if (err < 0) {
2967 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2968 err);
2969 goto out;
2970 }
2971
2972 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2973
2974 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2975 SOCK_RAW, IPPROTO_ICMPV6, net);
2976 if (err < 0) {
2977 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2978 err);
2979 goto out_sock_create;
2980 }
2981
2982 err = igmp6_proc_init(net);
2983 if (err)
2984 goto out_sock_create_autojoin;
2985
2986 return 0;
2987
2988 out_sock_create_autojoin:
2989 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2990 out_sock_create:
2991 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2992 out:
2993 return err;
2994 }
2995
2996 static void __net_exit igmp6_net_exit(struct net *net)
2997 {
2998 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2999 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3000 igmp6_proc_exit(net);
3001 }
3002
3003 static struct pernet_operations igmp6_net_ops = {
3004 .init = igmp6_net_init,
3005 .exit = igmp6_net_exit,
3006 };
3007
3008 int __init igmp6_init(void)
3009 {
3010 return register_pernet_subsys(&igmp6_net_ops);
3011 }
3012
3013 int __init igmp6_late_init(void)
3014 {
3015 return register_netdevice_notifier(&igmp6_netdev_notifier);
3016 }
3017
3018 void igmp6_cleanup(void)
3019 {
3020 unregister_pernet_subsys(&igmp6_net_ops);
3021 }
3022
3023 void igmp6_late_cleanup(void)
3024 {
3025 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3026 }
Linux with added FPC-III support