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Linux 5.1.5
[linux/fpc-iii.git] / net / ipv6 / mcast.c
blob42f3f5cd349fce18dee01bbb0c8e774f9573e8f0
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 np->mc_all;
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 im->mca_tomb = pmc->mca_tomb;
795 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 kfree(pmc);
803 }
804 spin_unlock_bh(&im->mca_lock);
805 }
806
807 static void mld_clear_delrec(struct inet6_dev *idev)
808 {
809 struct ifmcaddr6 *pmc, *nextpmc;
810
811 spin_lock_bh(&idev->mc_lock);
812 pmc = idev->mc_tomb;
813 idev->mc_tomb = NULL;
814 spin_unlock_bh(&idev->mc_lock);
815
816 for (; pmc; pmc = nextpmc) {
817 nextpmc = pmc->next;
818 ip6_mc_clear_src(pmc);
819 in6_dev_put(pmc->idev);
820 kfree(pmc);
821 }
822
823 /* clear dead sources, too */
824 read_lock_bh(&idev->lock);
825 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
826 struct ip6_sf_list *psf, *psf_next;
827
828 spin_lock_bh(&pmc->mca_lock);
829 psf = pmc->mca_tomb;
830 pmc->mca_tomb = NULL;
831 spin_unlock_bh(&pmc->mca_lock);
832 for (; psf; psf = psf_next) {
833 psf_next = psf->sf_next;
834 kfree(psf);
835 }
836 }
837 read_unlock_bh(&idev->lock);
838 }
839
840 static void mca_get(struct ifmcaddr6 *mc)
841 {
842 refcount_inc(&mc->mca_refcnt);
843 }
844
845 static void ma_put(struct ifmcaddr6 *mc)
846 {
847 if (refcount_dec_and_test(&mc->mca_refcnt)) {
848 in6_dev_put(mc->idev);
849 kfree(mc);
850 }
851 }
852
853 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
854 const struct in6_addr *addr,
855 unsigned int mode)
856 {
857 struct ifmcaddr6 *mc;
858
859 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
860 if (!mc)
861 return NULL;
862
863 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
864
865 mc->mca_addr = *addr;
866 mc->idev = idev; /* reference taken by caller */
867 mc->mca_users = 1;
868 /* mca_stamp should be updated upon changes */
869 mc->mca_cstamp = mc->mca_tstamp = jiffies;
870 refcount_set(&mc->mca_refcnt, 1);
871 spin_lock_init(&mc->mca_lock);
872
873 mc->mca_sfmode = mode;
874 mc->mca_sfcount[mode] = 1;
875
876 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
877 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
878 mc->mca_flags |= MAF_NOREPORT;
879
880 return mc;
881 }
882
883 /*
884 * device multicast group inc (add if not found)
885 */
886 static int __ipv6_dev_mc_inc(struct net_device *dev,
887 const struct in6_addr *addr, unsigned int mode)
888 {
889 struct ifmcaddr6 *mc;
890 struct inet6_dev *idev;
891
892 ASSERT_RTNL();
893
894 /* we need to take a reference on idev */
895 idev = in6_dev_get(dev);
896
897 if (!idev)
898 return -EINVAL;
899
900 write_lock_bh(&idev->lock);
901 if (idev->dead) {
902 write_unlock_bh(&idev->lock);
903 in6_dev_put(idev);
904 return -ENODEV;
905 }
906
907 for (mc = idev->mc_list; mc; mc = mc->next) {
908 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
909 mc->mca_users++;
910 write_unlock_bh(&idev->lock);
911 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
912 in6_dev_put(idev);
913 return 0;
914 }
915 }
916
917 mc = mca_alloc(idev, addr, mode);
918 if (!mc) {
919 write_unlock_bh(&idev->lock);
920 in6_dev_put(idev);
921 return -ENOMEM;
922 }
923
924 mc->next = idev->mc_list;
925 idev->mc_list = mc;
926
927 /* Hold this for the code below before we unlock,
928 * it is already exposed via idev->mc_list.
929 */
930 mca_get(mc);
931 write_unlock_bh(&idev->lock);
932
933 mld_del_delrec(idev, mc);
934 igmp6_group_added(mc);
935 ma_put(mc);
936 return 0;
937 }
938
939 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
940 {
941 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
942 }
943 EXPORT_SYMBOL(ipv6_dev_mc_inc);
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 EXPORT_SYMBOL(ipv6_dev_mc_dec);
992
993 /*
994 * check if the interface/address pair is valid
995 */
996 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
997 const struct in6_addr *src_addr)
998 {
999 struct inet6_dev *idev;
1000 struct ifmcaddr6 *mc;
1001 bool rv = false;
1002
1003 rcu_read_lock();
1004 idev = __in6_dev_get(dev);
1005 if (idev) {
1006 read_lock_bh(&idev->lock);
1007 for (mc = idev->mc_list; mc; mc = mc->next) {
1008 if (ipv6_addr_equal(&mc->mca_addr, group))
1009 break;
1010 }
1011 if (mc) {
1012 if (src_addr && !ipv6_addr_any(src_addr)) {
1013 struct ip6_sf_list *psf;
1014
1015 spin_lock_bh(&mc->mca_lock);
1016 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1017 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1018 break;
1019 }
1020 if (psf)
1021 rv = psf->sf_count[MCAST_INCLUDE] ||
1022 psf->sf_count[MCAST_EXCLUDE] !=
1023 mc->mca_sfcount[MCAST_EXCLUDE];
1024 else
1025 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1026 spin_unlock_bh(&mc->mca_lock);
1027 } else
1028 rv = true; /* don't filter unspecified source */
1029 }
1030 read_unlock_bh(&idev->lock);
1031 }
1032 rcu_read_unlock();
1033 return rv;
1034 }
1035
1036 static void mld_gq_start_timer(struct inet6_dev *idev)
1037 {
1038 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1039
1040 idev->mc_gq_running = 1;
1041 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1042 in6_dev_hold(idev);
1043 }
1044
1045 static void mld_gq_stop_timer(struct inet6_dev *idev)
1046 {
1047 idev->mc_gq_running = 0;
1048 if (del_timer(&idev->mc_gq_timer))
1049 __in6_dev_put(idev);
1050 }
1051
1052 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1053 {
1054 unsigned long tv = prandom_u32() % delay;
1055
1056 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1057 in6_dev_hold(idev);
1058 }
1059
1060 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1061 {
1062 idev->mc_ifc_count = 0;
1063 if (del_timer(&idev->mc_ifc_timer))
1064 __in6_dev_put(idev);
1065 }
1066
1067 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1068 {
1069 unsigned long tv = prandom_u32() % delay;
1070
1071 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1072 in6_dev_hold(idev);
1073 }
1074
1075 static void mld_dad_stop_timer(struct inet6_dev *idev)
1076 {
1077 if (del_timer(&idev->mc_dad_timer))
1078 __in6_dev_put(idev);
1079 }
1080
1081 /*
1082 * IGMP handling (alias multicast ICMPv6 messages)
1083 */
1084
1085 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1086 {
1087 unsigned long delay = resptime;
1088
1089 /* Do not start timer for these addresses */
1090 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1091 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1092 return;
1093
1094 if (del_timer(&ma->mca_timer)) {
1095 refcount_dec(&ma->mca_refcnt);
1096 delay = ma->mca_timer.expires - jiffies;
1097 }
1098
1099 if (delay >= resptime)
1100 delay = prandom_u32() % resptime;
1101
1102 ma->mca_timer.expires = jiffies + delay;
1103 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1104 refcount_inc(&ma->mca_refcnt);
1105 ma->mca_flags |= MAF_TIMER_RUNNING;
1106 }
1107
1108 /* mark EXCLUDE-mode sources */
1109 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1110 const struct in6_addr *srcs)
1111 {
1112 struct ip6_sf_list *psf;
1113 int i, scount;
1114
1115 scount = 0;
1116 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1117 if (scount == nsrcs)
1118 break;
1119 for (i = 0; i < nsrcs; i++) {
1120 /* skip inactive filters */
1121 if (psf->sf_count[MCAST_INCLUDE] ||
1122 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1123 psf->sf_count[MCAST_EXCLUDE])
1124 break;
1125 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1126 scount++;
1127 break;
1128 }
1129 }
1130 }
1131 pmc->mca_flags &= ~MAF_GSQUERY;
1132 if (scount == nsrcs) /* all sources excluded */
1133 return false;
1134 return true;
1135 }
1136
1137 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1138 const struct in6_addr *srcs)
1139 {
1140 struct ip6_sf_list *psf;
1141 int i, scount;
1142
1143 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1144 return mld_xmarksources(pmc, nsrcs, srcs);
1145
1146 /* mark INCLUDE-mode sources */
1147
1148 scount = 0;
1149 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1150 if (scount == nsrcs)
1151 break;
1152 for (i = 0; i < nsrcs; i++) {
1153 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1154 psf->sf_gsresp = 1;
1155 scount++;
1156 break;
1157 }
1158 }
1159 }
1160 if (!scount) {
1161 pmc->mca_flags &= ~MAF_GSQUERY;
1162 return false;
1163 }
1164 pmc->mca_flags |= MAF_GSQUERY;
1165 return true;
1166 }
1167
1168 static int mld_force_mld_version(const struct inet6_dev *idev)
1169 {
1170 /* Normally, both are 0 here. If enforcement to a particular is
1171 * being used, individual device enforcement will have a lower
1172 * precedence over 'all' device (.../conf/all/force_mld_version).
1173 */
1174
1175 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1176 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1177 else
1178 return idev->cnf.force_mld_version;
1179 }
1180
1181 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1182 {
1183 return mld_force_mld_version(idev) == 2;
1184 }
1185
1186 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1187 {
1188 return mld_force_mld_version(idev) == 1;
1189 }
1190
1191 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1192 {
1193 if (mld_in_v2_mode_only(idev))
1194 return false;
1195 if (mld_in_v1_mode_only(idev))
1196 return true;
1197 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1198 return true;
1199
1200 return false;
1201 }
1202
1203 static void mld_set_v1_mode(struct inet6_dev *idev)
1204 {
1205 /* RFC3810, relevant sections:
1206 * - 9.1. Robustness Variable
1207 * - 9.2. Query Interval
1208 * - 9.3. Query Response Interval
1209 * - 9.12. Older Version Querier Present Timeout
1210 */
1211 unsigned long switchback;
1212
1213 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1214
1215 idev->mc_v1_seen = jiffies + switchback;
1216 }
1217
1218 static void mld_update_qrv(struct inet6_dev *idev,
1219 const struct mld2_query *mlh2)
1220 {
1221 /* RFC3810, relevant sections:
1222 * - 5.1.8. QRV (Querier's Robustness Variable)
1223 * - 9.1. Robustness Variable
1224 */
1225
1226 /* The value of the Robustness Variable MUST NOT be zero,
1227 * and SHOULD NOT be one. Catch this here if we ever run
1228 * into such a case in future.
1229 */
1230 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1231 WARN_ON(idev->mc_qrv == 0);
1232
1233 if (mlh2->mld2q_qrv > 0)
1234 idev->mc_qrv = mlh2->mld2q_qrv;
1235
1236 if (unlikely(idev->mc_qrv < min_qrv)) {
1237 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1238 idev->mc_qrv, min_qrv);
1239 idev->mc_qrv = min_qrv;
1240 }
1241 }
1242
1243 static void mld_update_qi(struct inet6_dev *idev,
1244 const struct mld2_query *mlh2)
1245 {
1246 /* RFC3810, relevant sections:
1247 * - 5.1.9. QQIC (Querier's Query Interval Code)
1248 * - 9.2. Query Interval
1249 * - 9.12. Older Version Querier Present Timeout
1250 * (the [Query Interval] in the last Query received)
1251 */
1252 unsigned long mc_qqi;
1253
1254 if (mlh2->mld2q_qqic < 128) {
1255 mc_qqi = mlh2->mld2q_qqic;
1256 } else {
1257 unsigned long mc_man, mc_exp;
1258
1259 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1260 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1261
1262 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1263 }
1264
1265 idev->mc_qi = mc_qqi * HZ;
1266 }
1267
1268 static void mld_update_qri(struct inet6_dev *idev,
1269 const struct mld2_query *mlh2)
1270 {
1271 /* RFC3810, relevant sections:
1272 * - 5.1.3. Maximum Response Code
1273 * - 9.3. Query Response Interval
1274 */
1275 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1276 }
1277
1278 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1279 unsigned long *max_delay, bool v1_query)
1280 {
1281 unsigned long mldv1_md;
1282
1283 /* Ignore v1 queries */
1284 if (mld_in_v2_mode_only(idev))
1285 return -EINVAL;
1286
1287 mldv1_md = ntohs(mld->mld_maxdelay);
1288
1289 /* When in MLDv1 fallback and a MLDv2 router start-up being
1290 * unaware of current MLDv1 operation, the MRC == MRD mapping
1291 * only works when the exponential algorithm is not being
1292 * used (as MLDv1 is unaware of such things).
1293 *
1294 * According to the RFC author, the MLDv2 implementations
1295 * he's aware of all use a MRC < 32768 on start up queries.
1296 *
1297 * Thus, should we *ever* encounter something else larger
1298 * than that, just assume the maximum possible within our
1299 * reach.
1300 */
1301 if (!v1_query)
1302 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1303
1304 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1305
1306 /* MLDv1 router present: we need to go into v1 mode *only*
1307 * when an MLDv1 query is received as per section 9.12. of
1308 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1309 * queries MUST be of exactly 24 octets.
1310 */
1311 if (v1_query)
1312 mld_set_v1_mode(idev);
1313
1314 /* cancel MLDv2 report timer */
1315 mld_gq_stop_timer(idev);
1316 /* cancel the interface change timer */
1317 mld_ifc_stop_timer(idev);
1318 /* clear deleted report items */
1319 mld_clear_delrec(idev);
1320
1321 return 0;
1322 }
1323
1324 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1325 unsigned long *max_delay)
1326 {
1327 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1328
1329 mld_update_qrv(idev, mld);
1330 mld_update_qi(idev, mld);
1331 mld_update_qri(idev, mld);
1332
1333 idev->mc_maxdelay = *max_delay;
1334
1335 return 0;
1336 }
1337
1338 /* called with rcu_read_lock() */
1339 int igmp6_event_query(struct sk_buff *skb)
1340 {
1341 struct mld2_query *mlh2 = NULL;
1342 struct ifmcaddr6 *ma;
1343 const struct in6_addr *group;
1344 unsigned long max_delay;
1345 struct inet6_dev *idev;
1346 struct mld_msg *mld;
1347 int group_type;
1348 int mark = 0;
1349 int len, err;
1350
1351 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1352 return -EINVAL;
1353
1354 /* compute payload length excluding extension headers */
1355 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1356 len -= skb_network_header_len(skb);
1357
1358 /* RFC3810 6.2
1359 * Upon reception of an MLD message that contains a Query, the node
1360 * checks if the source address of the message is a valid link-local
1361 * address, if the Hop Limit is set to 1, and if the Router Alert
1362 * option is present in the Hop-By-Hop Options header of the IPv6
1363 * packet. If any of these checks fails, the packet is dropped.
1364 */
1365 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1366 ipv6_hdr(skb)->hop_limit != 1 ||
1367 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1368 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1369 return -EINVAL;
1370
1371 idev = __in6_dev_get(skb->dev);
1372 if (!idev)
1373 return 0;
1374
1375 mld = (struct mld_msg *)icmp6_hdr(skb);
1376 group = &mld->mld_mca;
1377 group_type = ipv6_addr_type(group);
1378
1379 if (group_type != IPV6_ADDR_ANY &&
1380 !(group_type&IPV6_ADDR_MULTICAST))
1381 return -EINVAL;
1382
1383 if (len < MLD_V1_QUERY_LEN) {
1384 return -EINVAL;
1385 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1386 err = mld_process_v1(idev, mld, &max_delay,
1387 len == MLD_V1_QUERY_LEN);
1388 if (err < 0)
1389 return err;
1390 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1391 int srcs_offset = sizeof(struct mld2_query) -
1392 sizeof(struct icmp6hdr);
1393
1394 if (!pskb_may_pull(skb, srcs_offset))
1395 return -EINVAL;
1396
1397 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1398
1399 err = mld_process_v2(idev, mlh2, &max_delay);
1400 if (err < 0)
1401 return err;
1402
1403 if (group_type == IPV6_ADDR_ANY) { /* general query */
1404 if (mlh2->mld2q_nsrcs)
1405 return -EINVAL; /* no sources allowed */
1406
1407 mld_gq_start_timer(idev);
1408 return 0;
1409 }
1410 /* mark sources to include, if group & source-specific */
1411 if (mlh2->mld2q_nsrcs != 0) {
1412 if (!pskb_may_pull(skb, srcs_offset +
1413 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1414 return -EINVAL;
1415
1416 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1417 mark = 1;
1418 }
1419 } else {
1420 return -EINVAL;
1421 }
1422
1423 read_lock_bh(&idev->lock);
1424 if (group_type == IPV6_ADDR_ANY) {
1425 for (ma = idev->mc_list; ma; ma = ma->next) {
1426 spin_lock_bh(&ma->mca_lock);
1427 igmp6_group_queried(ma, max_delay);
1428 spin_unlock_bh(&ma->mca_lock);
1429 }
1430 } else {
1431 for (ma = idev->mc_list; ma; ma = ma->next) {
1432 if (!ipv6_addr_equal(group, &ma->mca_addr))
1433 continue;
1434 spin_lock_bh(&ma->mca_lock);
1435 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1436 /* gsquery <- gsquery && mark */
1437 if (!mark)
1438 ma->mca_flags &= ~MAF_GSQUERY;
1439 } else {
1440 /* gsquery <- mark */
1441 if (mark)
1442 ma->mca_flags |= MAF_GSQUERY;
1443 else
1444 ma->mca_flags &= ~MAF_GSQUERY;
1445 }
1446 if (!(ma->mca_flags & MAF_GSQUERY) ||
1447 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1448 igmp6_group_queried(ma, max_delay);
1449 spin_unlock_bh(&ma->mca_lock);
1450 break;
1451 }
1452 }
1453 read_unlock_bh(&idev->lock);
1454
1455 return 0;
1456 }
1457
1458 /* called with rcu_read_lock() */
1459 int igmp6_event_report(struct sk_buff *skb)
1460 {
1461 struct ifmcaddr6 *ma;
1462 struct inet6_dev *idev;
1463 struct mld_msg *mld;
1464 int addr_type;
1465
1466 /* Our own report looped back. Ignore it. */
1467 if (skb->pkt_type == PACKET_LOOPBACK)
1468 return 0;
1469
1470 /* send our report if the MC router may not have heard this report */
1471 if (skb->pkt_type != PACKET_MULTICAST &&
1472 skb->pkt_type != PACKET_BROADCAST)
1473 return 0;
1474
1475 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1476 return -EINVAL;
1477
1478 mld = (struct mld_msg *)icmp6_hdr(skb);
1479
1480 /* Drop reports with not link local source */
1481 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1482 if (addr_type != IPV6_ADDR_ANY &&
1483 !(addr_type&IPV6_ADDR_LINKLOCAL))
1484 return -EINVAL;
1485
1486 idev = __in6_dev_get(skb->dev);
1487 if (!idev)
1488 return -ENODEV;
1489
1490 /*
1491 * Cancel the timer for this group
1492 */
1493
1494 read_lock_bh(&idev->lock);
1495 for (ma = idev->mc_list; ma; ma = ma->next) {
1496 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1497 spin_lock(&ma->mca_lock);
1498 if (del_timer(&ma->mca_timer))
1499 refcount_dec(&ma->mca_refcnt);
1500 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1501 spin_unlock(&ma->mca_lock);
1502 break;
1503 }
1504 }
1505 read_unlock_bh(&idev->lock);
1506 return 0;
1507 }
1508
1509 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1510 int gdeleted, int sdeleted)
1511 {
1512 switch (type) {
1513 case MLD2_MODE_IS_INCLUDE:
1514 case MLD2_MODE_IS_EXCLUDE:
1515 if (gdeleted || sdeleted)
1516 return false;
1517 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1518 if (pmc->mca_sfmode == MCAST_INCLUDE)
1519 return true;
1520 /* don't include if this source is excluded
1521 * in all filters
1522 */
1523 if (psf->sf_count[MCAST_INCLUDE])
1524 return type == MLD2_MODE_IS_INCLUDE;
1525 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1526 psf->sf_count[MCAST_EXCLUDE];
1527 }
1528 return false;
1529 case MLD2_CHANGE_TO_INCLUDE:
1530 if (gdeleted || sdeleted)
1531 return false;
1532 return psf->sf_count[MCAST_INCLUDE] != 0;
1533 case MLD2_CHANGE_TO_EXCLUDE:
1534 if (gdeleted || sdeleted)
1535 return false;
1536 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1537 psf->sf_count[MCAST_INCLUDE])
1538 return false;
1539 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1540 psf->sf_count[MCAST_EXCLUDE];
1541 case MLD2_ALLOW_NEW_SOURCES:
1542 if (gdeleted || !psf->sf_crcount)
1543 return false;
1544 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1545 case MLD2_BLOCK_OLD_SOURCES:
1546 if (pmc->mca_sfmode == MCAST_INCLUDE)
1547 return gdeleted || (psf->sf_crcount && sdeleted);
1548 return psf->sf_crcount && !gdeleted && !sdeleted;
1549 }
1550 return false;
1551 }
1552
1553 static int
1554 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1555 {
1556 struct ip6_sf_list *psf;
1557 int scount = 0;
1558
1559 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1560 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1561 continue;
1562 scount++;
1563 }
1564 return scount;
1565 }
1566
1567 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1568 struct net_device *dev,
1569 const struct in6_addr *saddr,
1570 const struct in6_addr *daddr,
1571 int proto, int len)
1572 {
1573 struct ipv6hdr *hdr;
1574
1575 skb->protocol = htons(ETH_P_IPV6);
1576 skb->dev = dev;
1577
1578 skb_reset_network_header(skb);
1579 skb_put(skb, sizeof(struct ipv6hdr));
1580 hdr = ipv6_hdr(skb);
1581
1582 ip6_flow_hdr(hdr, 0, 0);
1583
1584 hdr->payload_len = htons(len);
1585 hdr->nexthdr = proto;
1586 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1587
1588 hdr->saddr = *saddr;
1589 hdr->daddr = *daddr;
1590 }
1591
1592 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1593 {
1594 struct net_device *dev = idev->dev;
1595 struct net *net = dev_net(dev);
1596 struct sock *sk = net->ipv6.igmp_sk;
1597 struct sk_buff *skb;
1598 struct mld2_report *pmr;
1599 struct in6_addr addr_buf;
1600 const struct in6_addr *saddr;
1601 int hlen = LL_RESERVED_SPACE(dev);
1602 int tlen = dev->needed_tailroom;
1603 unsigned int size = mtu + hlen + tlen;
1604 int err;
1605 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1606 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1607 IPV6_TLV_PADN, 0 };
1608
1609 /* we assume size > sizeof(ra) here */
1610 /* limit our allocations to order-0 page */
1611 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1612 skb = sock_alloc_send_skb(sk, size, 1, &err);
1613
1614 if (!skb)
1615 return NULL;
1616
1617 skb->priority = TC_PRIO_CONTROL;
1618 skb_reserve(skb, hlen);
1619 skb_tailroom_reserve(skb, mtu, tlen);
1620
1621 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1622 /* <draft-ietf-magma-mld-source-05.txt>:
1623 * use unspecified address as the source address
1624 * when a valid link-local address is not available.
1625 */
1626 saddr = &in6addr_any;
1627 } else
1628 saddr = &addr_buf;
1629
1630 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1631
1632 skb_put_data(skb, ra, sizeof(ra));
1633
1634 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1635 skb_put(skb, sizeof(*pmr));
1636 pmr = (struct mld2_report *)skb_transport_header(skb);
1637 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1638 pmr->mld2r_resv1 = 0;
1639 pmr->mld2r_cksum = 0;
1640 pmr->mld2r_resv2 = 0;
1641 pmr->mld2r_ngrec = 0;
1642 return skb;
1643 }
1644
1645 static void mld_sendpack(struct sk_buff *skb)
1646 {
1647 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1648 struct mld2_report *pmr =
1649 (struct mld2_report *)skb_transport_header(skb);
1650 int payload_len, mldlen;
1651 struct inet6_dev *idev;
1652 struct net *net = dev_net(skb->dev);
1653 int err;
1654 struct flowi6 fl6;
1655 struct dst_entry *dst;
1656
1657 rcu_read_lock();
1658 idev = __in6_dev_get(skb->dev);
1659 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1660
1661 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1662 sizeof(*pip6);
1663 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1664 pip6->payload_len = htons(payload_len);
1665
1666 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1667 IPPROTO_ICMPV6,
1668 csum_partial(skb_transport_header(skb),
1669 mldlen, 0));
1670
1671 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1672 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1673 skb->dev->ifindex);
1674 dst = icmp6_dst_alloc(skb->dev, &fl6);
1675
1676 err = 0;
1677 if (IS_ERR(dst)) {
1678 err = PTR_ERR(dst);
1679 dst = NULL;
1680 }
1681 skb_dst_set(skb, dst);
1682 if (err)
1683 goto err_out;
1684
1685 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1686 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1687 dst_output);
1688 out:
1689 if (!err) {
1690 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1691 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1692 } else {
1693 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1694 }
1695
1696 rcu_read_unlock();
1697 return;
1698
1699 err_out:
1700 kfree_skb(skb);
1701 goto out;
1702 }
1703
1704 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1705 {
1706 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1707 }
1708
1709 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1710 int type, struct mld2_grec **ppgr, unsigned int mtu)
1711 {
1712 struct mld2_report *pmr;
1713 struct mld2_grec *pgr;
1714
1715 if (!skb) {
1716 skb = mld_newpack(pmc->idev, mtu);
1717 if (!skb)
1718 return NULL;
1719 }
1720 pgr = skb_put(skb, sizeof(struct mld2_grec));
1721 pgr->grec_type = type;
1722 pgr->grec_auxwords = 0;
1723 pgr->grec_nsrcs = 0;
1724 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1725 pmr = (struct mld2_report *)skb_transport_header(skb);
1726 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1727 *ppgr = pgr;
1728 return skb;
1729 }
1730
1731 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1732
1733 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1734 int type, int gdeleted, int sdeleted, int crsend)
1735 {
1736 struct inet6_dev *idev = pmc->idev;
1737 struct net_device *dev = idev->dev;
1738 struct mld2_report *pmr;
1739 struct mld2_grec *pgr = NULL;
1740 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1741 int scount, stotal, first, isquery, truncate;
1742 unsigned int mtu;
1743
1744 if (pmc->mca_flags & MAF_NOREPORT)
1745 return skb;
1746
1747 mtu = READ_ONCE(dev->mtu);
1748 if (mtu < IPV6_MIN_MTU)
1749 return skb;
1750
1751 isquery = type == MLD2_MODE_IS_INCLUDE ||
1752 type == MLD2_MODE_IS_EXCLUDE;
1753 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1754 type == MLD2_CHANGE_TO_EXCLUDE;
1755
1756 stotal = scount = 0;
1757
1758 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1759
1760 if (!*psf_list)
1761 goto empty_source;
1762
1763 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1764
1765 /* EX and TO_EX get a fresh packet, if needed */
1766 if (truncate) {
1767 if (pmr && pmr->mld2r_ngrec &&
1768 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1769 if (skb)
1770 mld_sendpack(skb);
1771 skb = mld_newpack(idev, mtu);
1772 }
1773 }
1774 first = 1;
1775 psf_prev = NULL;
1776 for (psf = *psf_list; psf; psf = psf_next) {
1777 struct in6_addr *psrc;
1778
1779 psf_next = psf->sf_next;
1780
1781 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1782 psf_prev = psf;
1783 continue;
1784 }
1785
1786 /* Based on RFC3810 6.1. Should not send source-list change
1787 * records when there is a filter mode change.
1788 */
1789 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1790 (!gdeleted && pmc->mca_crcount)) &&
1791 (type == MLD2_ALLOW_NEW_SOURCES ||
1792 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1793 goto decrease_sf_crcount;
1794
1795 /* clear marks on query responses */
1796 if (isquery)
1797 psf->sf_gsresp = 0;
1798
1799 if (AVAILABLE(skb) < sizeof(*psrc) +
1800 first*sizeof(struct mld2_grec)) {
1801 if (truncate && !first)
1802 break; /* truncate these */
1803 if (pgr)
1804 pgr->grec_nsrcs = htons(scount);
1805 if (skb)
1806 mld_sendpack(skb);
1807 skb = mld_newpack(idev, mtu);
1808 first = 1;
1809 scount = 0;
1810 }
1811 if (first) {
1812 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1813 first = 0;
1814 }
1815 if (!skb)
1816 return NULL;
1817 psrc = skb_put(skb, sizeof(*psrc));
1818 *psrc = psf->sf_addr;
1819 scount++; stotal++;
1820 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1821 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1822 decrease_sf_crcount:
1823 psf->sf_crcount--;
1824 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1825 if (psf_prev)
1826 psf_prev->sf_next = psf->sf_next;
1827 else
1828 *psf_list = psf->sf_next;
1829 kfree(psf);
1830 continue;
1831 }
1832 }
1833 psf_prev = psf;
1834 }
1835
1836 empty_source:
1837 if (!stotal) {
1838 if (type == MLD2_ALLOW_NEW_SOURCES ||
1839 type == MLD2_BLOCK_OLD_SOURCES)
1840 return skb;
1841 if (pmc->mca_crcount || isquery || crsend) {
1842 /* make sure we have room for group header */
1843 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1844 mld_sendpack(skb);
1845 skb = NULL; /* add_grhead will get a new one */
1846 }
1847 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1848 }
1849 }
1850 if (pgr)
1851 pgr->grec_nsrcs = htons(scount);
1852
1853 if (isquery)
1854 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1855 return skb;
1856 }
1857
1858 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1859 {
1860 struct sk_buff *skb = NULL;
1861 int type;
1862
1863 read_lock_bh(&idev->lock);
1864 if (!pmc) {
1865 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1866 if (pmc->mca_flags & MAF_NOREPORT)
1867 continue;
1868 spin_lock_bh(&pmc->mca_lock);
1869 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1870 type = MLD2_MODE_IS_EXCLUDE;
1871 else
1872 type = MLD2_MODE_IS_INCLUDE;
1873 skb = add_grec(skb, pmc, type, 0, 0, 0);
1874 spin_unlock_bh(&pmc->mca_lock);
1875 }
1876 } else {
1877 spin_lock_bh(&pmc->mca_lock);
1878 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1879 type = MLD2_MODE_IS_EXCLUDE;
1880 else
1881 type = MLD2_MODE_IS_INCLUDE;
1882 skb = add_grec(skb, pmc, type, 0, 0, 0);
1883 spin_unlock_bh(&pmc->mca_lock);
1884 }
1885 read_unlock_bh(&idev->lock);
1886 if (skb)
1887 mld_sendpack(skb);
1888 }
1889
1890 /*
1891 * remove zero-count source records from a source filter list
1892 */
1893 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1894 {
1895 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1896
1897 psf_prev = NULL;
1898 for (psf = *ppsf; psf; psf = psf_next) {
1899 psf_next = psf->sf_next;
1900 if (psf->sf_crcount == 0) {
1901 if (psf_prev)
1902 psf_prev->sf_next = psf->sf_next;
1903 else
1904 *ppsf = psf->sf_next;
1905 kfree(psf);
1906 } else
1907 psf_prev = psf;
1908 }
1909 }
1910
1911 static void mld_send_cr(struct inet6_dev *idev)
1912 {
1913 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1914 struct sk_buff *skb = NULL;
1915 int type, dtype;
1916
1917 read_lock_bh(&idev->lock);
1918 spin_lock(&idev->mc_lock);
1919
1920 /* deleted MCA's */
1921 pmc_prev = NULL;
1922 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1923 pmc_next = pmc->next;
1924 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1925 type = MLD2_BLOCK_OLD_SOURCES;
1926 dtype = MLD2_BLOCK_OLD_SOURCES;
1927 skb = add_grec(skb, pmc, type, 1, 0, 0);
1928 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1929 }
1930 if (pmc->mca_crcount) {
1931 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1932 type = MLD2_CHANGE_TO_INCLUDE;
1933 skb = add_grec(skb, pmc, type, 1, 0, 0);
1934 }
1935 pmc->mca_crcount--;
1936 if (pmc->mca_crcount == 0) {
1937 mld_clear_zeros(&pmc->mca_tomb);
1938 mld_clear_zeros(&pmc->mca_sources);
1939 }
1940 }
1941 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1942 !pmc->mca_sources) {
1943 if (pmc_prev)
1944 pmc_prev->next = pmc_next;
1945 else
1946 idev->mc_tomb = pmc_next;
1947 in6_dev_put(pmc->idev);
1948 kfree(pmc);
1949 } else
1950 pmc_prev = pmc;
1951 }
1952 spin_unlock(&idev->mc_lock);
1953
1954 /* change recs */
1955 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1956 spin_lock_bh(&pmc->mca_lock);
1957 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958 type = MLD2_BLOCK_OLD_SOURCES;
1959 dtype = MLD2_ALLOW_NEW_SOURCES;
1960 } else {
1961 type = MLD2_ALLOW_NEW_SOURCES;
1962 dtype = MLD2_BLOCK_OLD_SOURCES;
1963 }
1964 skb = add_grec(skb, pmc, type, 0, 0, 0);
1965 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1966
1967 /* filter mode changes */
1968 if (pmc->mca_crcount) {
1969 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1970 type = MLD2_CHANGE_TO_EXCLUDE;
1971 else
1972 type = MLD2_CHANGE_TO_INCLUDE;
1973 skb = add_grec(skb, pmc, type, 0, 0, 0);
1974 pmc->mca_crcount--;
1975 }
1976 spin_unlock_bh(&pmc->mca_lock);
1977 }
1978 read_unlock_bh(&idev->lock);
1979 if (!skb)
1980 return;
1981 (void) mld_sendpack(skb);
1982 }
1983
1984 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1985 {
1986 struct net *net = dev_net(dev);
1987 struct sock *sk = net->ipv6.igmp_sk;
1988 struct inet6_dev *idev;
1989 struct sk_buff *skb;
1990 struct mld_msg *hdr;
1991 const struct in6_addr *snd_addr, *saddr;
1992 struct in6_addr addr_buf;
1993 int hlen = LL_RESERVED_SPACE(dev);
1994 int tlen = dev->needed_tailroom;
1995 int err, len, payload_len, full_len;
1996 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1997 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1998 IPV6_TLV_PADN, 0 };
1999 struct flowi6 fl6;
2000 struct dst_entry *dst;
2001
2002 if (type == ICMPV6_MGM_REDUCTION)
2003 snd_addr = &in6addr_linklocal_allrouters;
2004 else
2005 snd_addr = addr;
2006
2007 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2008 payload_len = len + sizeof(ra);
2009 full_len = sizeof(struct ipv6hdr) + payload_len;
2010
2011 rcu_read_lock();
2012 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2013 IPSTATS_MIB_OUT, full_len);
2014 rcu_read_unlock();
2015
2016 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2017
2018 if (!skb) {
2019 rcu_read_lock();
2020 IP6_INC_STATS(net, __in6_dev_get(dev),
2021 IPSTATS_MIB_OUTDISCARDS);
2022 rcu_read_unlock();
2023 return;
2024 }
2025 skb->priority = TC_PRIO_CONTROL;
2026 skb_reserve(skb, hlen);
2027
2028 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2029 /* <draft-ietf-magma-mld-source-05.txt>:
2030 * use unspecified address as the source address
2031 * when a valid link-local address is not available.
2032 */
2033 saddr = &in6addr_any;
2034 } else
2035 saddr = &addr_buf;
2036
2037 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2038
2039 skb_put_data(skb, ra, sizeof(ra));
2040
2041 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2042 hdr->mld_type = type;
2043 hdr->mld_mca = *addr;
2044
2045 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2046 IPPROTO_ICMPV6,
2047 csum_partial(hdr, len, 0));
2048
2049 rcu_read_lock();
2050 idev = __in6_dev_get(skb->dev);
2051
2052 icmpv6_flow_init(sk, &fl6, type,
2053 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2054 skb->dev->ifindex);
2055 dst = icmp6_dst_alloc(skb->dev, &fl6);
2056 if (IS_ERR(dst)) {
2057 err = PTR_ERR(dst);
2058 goto err_out;
2059 }
2060
2061 skb_dst_set(skb, dst);
2062 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2063 net, sk, skb, NULL, skb->dev,
2064 dst_output);
2065 out:
2066 if (!err) {
2067 ICMP6MSGOUT_INC_STATS(net, idev, type);
2068 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2069 } else
2070 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2071
2072 rcu_read_unlock();
2073 return;
2074
2075 err_out:
2076 kfree_skb(skb);
2077 goto out;
2078 }
2079
2080 static void mld_send_initial_cr(struct inet6_dev *idev)
2081 {
2082 struct sk_buff *skb;
2083 struct ifmcaddr6 *pmc;
2084 int type;
2085
2086 if (mld_in_v1_mode(idev))
2087 return;
2088
2089 skb = NULL;
2090 read_lock_bh(&idev->lock);
2091 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2092 spin_lock_bh(&pmc->mca_lock);
2093 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2094 type = MLD2_CHANGE_TO_EXCLUDE;
2095 else
2096 type = MLD2_ALLOW_NEW_SOURCES;
2097 skb = add_grec(skb, pmc, type, 0, 0, 1);
2098 spin_unlock_bh(&pmc->mca_lock);
2099 }
2100 read_unlock_bh(&idev->lock);
2101 if (skb)
2102 mld_sendpack(skb);
2103 }
2104
2105 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2106 {
2107 idev->mc_dad_count = idev->mc_qrv;
2108 if (idev->mc_dad_count) {
2109 mld_send_initial_cr(idev);
2110 idev->mc_dad_count--;
2111 if (idev->mc_dad_count)
2112 mld_dad_start_timer(idev,
2113 unsolicited_report_interval(idev));
2114 }
2115 }
2116
2117 static void mld_dad_timer_expire(struct timer_list *t)
2118 {
2119 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2120
2121 mld_send_initial_cr(idev);
2122 if (idev->mc_dad_count) {
2123 idev->mc_dad_count--;
2124 if (idev->mc_dad_count)
2125 mld_dad_start_timer(idev,
2126 unsolicited_report_interval(idev));
2127 }
2128 in6_dev_put(idev);
2129 }
2130
2131 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2132 const struct in6_addr *psfsrc)
2133 {
2134 struct ip6_sf_list *psf, *psf_prev;
2135 int rv = 0;
2136
2137 psf_prev = NULL;
2138 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2139 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2140 break;
2141 psf_prev = psf;
2142 }
2143 if (!psf || psf->sf_count[sfmode] == 0) {
2144 /* source filter not found, or count wrong => bug */
2145 return -ESRCH;
2146 }
2147 psf->sf_count[sfmode]--;
2148 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2149 struct inet6_dev *idev = pmc->idev;
2150
2151 /* no more filters for this source */
2152 if (psf_prev)
2153 psf_prev->sf_next = psf->sf_next;
2154 else
2155 pmc->mca_sources = psf->sf_next;
2156 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2157 !mld_in_v1_mode(idev)) {
2158 psf->sf_crcount = idev->mc_qrv;
2159 psf->sf_next = pmc->mca_tomb;
2160 pmc->mca_tomb = psf;
2161 rv = 1;
2162 } else
2163 kfree(psf);
2164 }
2165 return rv;
2166 }
2167
2168 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2169 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2170 int delta)
2171 {
2172 struct ifmcaddr6 *pmc;
2173 int changerec = 0;
2174 int i, err;
2175
2176 if (!idev)
2177 return -ENODEV;
2178 read_lock_bh(&idev->lock);
2179 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2180 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2181 break;
2182 }
2183 if (!pmc) {
2184 /* MCA not found?? bug */
2185 read_unlock_bh(&idev->lock);
2186 return -ESRCH;
2187 }
2188 spin_lock_bh(&pmc->mca_lock);
2189 sf_markstate(pmc);
2190 if (!delta) {
2191 if (!pmc->mca_sfcount[sfmode]) {
2192 spin_unlock_bh(&pmc->mca_lock);
2193 read_unlock_bh(&idev->lock);
2194 return -EINVAL;
2195 }
2196 pmc->mca_sfcount[sfmode]--;
2197 }
2198 err = 0;
2199 for (i = 0; i < sfcount; i++) {
2200 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2201
2202 changerec |= rv > 0;
2203 if (!err && rv < 0)
2204 err = rv;
2205 }
2206 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2207 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2208 pmc->mca_sfcount[MCAST_INCLUDE]) {
2209 struct ip6_sf_list *psf;
2210
2211 /* filter mode change */
2212 pmc->mca_sfmode = MCAST_INCLUDE;
2213 pmc->mca_crcount = idev->mc_qrv;
2214 idev->mc_ifc_count = pmc->mca_crcount;
2215 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2216 psf->sf_crcount = 0;
2217 mld_ifc_event(pmc->idev);
2218 } else if (sf_setstate(pmc) || changerec)
2219 mld_ifc_event(pmc->idev);
2220 spin_unlock_bh(&pmc->mca_lock);
2221 read_unlock_bh(&idev->lock);
2222 return err;
2223 }
2224
2225 /*
2226 * Add multicast single-source filter to the interface list
2227 */
2228 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2229 const struct in6_addr *psfsrc)
2230 {
2231 struct ip6_sf_list *psf, *psf_prev;
2232
2233 psf_prev = NULL;
2234 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2235 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2236 break;
2237 psf_prev = psf;
2238 }
2239 if (!psf) {
2240 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2241 if (!psf)
2242 return -ENOBUFS;
2243
2244 psf->sf_addr = *psfsrc;
2245 if (psf_prev) {
2246 psf_prev->sf_next = psf;
2247 } else
2248 pmc->mca_sources = psf;
2249 }
2250 psf->sf_count[sfmode]++;
2251 return 0;
2252 }
2253
2254 static void sf_markstate(struct ifmcaddr6 *pmc)
2255 {
2256 struct ip6_sf_list *psf;
2257 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2258
2259 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2260 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2261 psf->sf_oldin = mca_xcount ==
2262 psf->sf_count[MCAST_EXCLUDE] &&
2263 !psf->sf_count[MCAST_INCLUDE];
2264 } else
2265 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2266 }
2267
2268 static int sf_setstate(struct ifmcaddr6 *pmc)
2269 {
2270 struct ip6_sf_list *psf, *dpsf;
2271 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2272 int qrv = pmc->idev->mc_qrv;
2273 int new_in, rv;
2274
2275 rv = 0;
2276 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2277 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2278 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2279 !psf->sf_count[MCAST_INCLUDE];
2280 } else
2281 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2282 if (new_in) {
2283 if (!psf->sf_oldin) {
2284 struct ip6_sf_list *prev = NULL;
2285
2286 for (dpsf = pmc->mca_tomb; dpsf;
2287 dpsf = dpsf->sf_next) {
2288 if (ipv6_addr_equal(&dpsf->sf_addr,
2289 &psf->sf_addr))
2290 break;
2291 prev = dpsf;
2292 }
2293 if (dpsf) {
2294 if (prev)
2295 prev->sf_next = dpsf->sf_next;
2296 else
2297 pmc->mca_tomb = dpsf->sf_next;
2298 kfree(dpsf);
2299 }
2300 psf->sf_crcount = qrv;
2301 rv++;
2302 }
2303 } else if (psf->sf_oldin) {
2304 psf->sf_crcount = 0;
2305 /*
2306 * add or update "delete" records if an active filter
2307 * is now inactive
2308 */
2309 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2310 if (ipv6_addr_equal(&dpsf->sf_addr,
2311 &psf->sf_addr))
2312 break;
2313 if (!dpsf) {
2314 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2315 if (!dpsf)
2316 continue;
2317 *dpsf = *psf;
2318 /* pmc->mca_lock held by callers */
2319 dpsf->sf_next = pmc->mca_tomb;
2320 pmc->mca_tomb = dpsf;
2321 }
2322 dpsf->sf_crcount = qrv;
2323 rv++;
2324 }
2325 }
2326 return rv;
2327 }
2328
2329 /*
2330 * Add multicast source filter list to the interface list
2331 */
2332 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2333 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2334 int delta)
2335 {
2336 struct ifmcaddr6 *pmc;
2337 int isexclude;
2338 int i, err;
2339
2340 if (!idev)
2341 return -ENODEV;
2342 read_lock_bh(&idev->lock);
2343 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2344 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2345 break;
2346 }
2347 if (!pmc) {
2348 /* MCA not found?? bug */
2349 read_unlock_bh(&idev->lock);
2350 return -ESRCH;
2351 }
2352 spin_lock_bh(&pmc->mca_lock);
2353
2354 sf_markstate(pmc);
2355 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2356 if (!delta)
2357 pmc->mca_sfcount[sfmode]++;
2358 err = 0;
2359 for (i = 0; i < sfcount; i++) {
2360 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2361 if (err)
2362 break;
2363 }
2364 if (err) {
2365 int j;
2366
2367 if (!delta)
2368 pmc->mca_sfcount[sfmode]--;
2369 for (j = 0; j < i; j++)
2370 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2371 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2372 struct ip6_sf_list *psf;
2373
2374 /* filter mode change */
2375 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2376 pmc->mca_sfmode = MCAST_EXCLUDE;
2377 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2378 pmc->mca_sfmode = MCAST_INCLUDE;
2379 /* else no filters; keep old mode for reports */
2380
2381 pmc->mca_crcount = idev->mc_qrv;
2382 idev->mc_ifc_count = pmc->mca_crcount;
2383 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2384 psf->sf_crcount = 0;
2385 mld_ifc_event(idev);
2386 } else if (sf_setstate(pmc))
2387 mld_ifc_event(idev);
2388 spin_unlock_bh(&pmc->mca_lock);
2389 read_unlock_bh(&idev->lock);
2390 return err;
2391 }
2392
2393 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2394 {
2395 struct ip6_sf_list *psf, *nextpsf;
2396
2397 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2398 nextpsf = psf->sf_next;
2399 kfree(psf);
2400 }
2401 pmc->mca_tomb = NULL;
2402 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2403 nextpsf = psf->sf_next;
2404 kfree(psf);
2405 }
2406 pmc->mca_sources = NULL;
2407 pmc->mca_sfmode = MCAST_EXCLUDE;
2408 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2409 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2410 }
2411
2412
2413 static void igmp6_join_group(struct ifmcaddr6 *ma)
2414 {
2415 unsigned long delay;
2416
2417 if (ma->mca_flags & MAF_NOREPORT)
2418 return;
2419
2420 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2421
2422 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2423
2424 spin_lock_bh(&ma->mca_lock);
2425 if (del_timer(&ma->mca_timer)) {
2426 refcount_dec(&ma->mca_refcnt);
2427 delay = ma->mca_timer.expires - jiffies;
2428 }
2429
2430 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2431 refcount_inc(&ma->mca_refcnt);
2432 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2433 spin_unlock_bh(&ma->mca_lock);
2434 }
2435
2436 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2437 struct inet6_dev *idev)
2438 {
2439 int err;
2440
2441 write_lock_bh(&iml->sflock);
2442 if (!iml->sflist) {
2443 /* any-source empty exclude case */
2444 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2445 } else {
2446 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2447 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2448 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2449 iml->sflist = NULL;
2450 }
2451 write_unlock_bh(&iml->sflock);
2452 return err;
2453 }
2454
2455 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2456 {
2457 if (mld_in_v1_mode(ma->idev)) {
2458 if (ma->mca_flags & MAF_LAST_REPORTER)
2459 igmp6_send(&ma->mca_addr, ma->idev->dev,
2460 ICMPV6_MGM_REDUCTION);
2461 } else {
2462 mld_add_delrec(ma->idev, ma);
2463 mld_ifc_event(ma->idev);
2464 }
2465 }
2466
2467 static void mld_gq_timer_expire(struct timer_list *t)
2468 {
2469 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2470
2471 idev->mc_gq_running = 0;
2472 mld_send_report(idev, NULL);
2473 in6_dev_put(idev);
2474 }
2475
2476 static void mld_ifc_timer_expire(struct timer_list *t)
2477 {
2478 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2479
2480 mld_send_cr(idev);
2481 if (idev->mc_ifc_count) {
2482 idev->mc_ifc_count--;
2483 if (idev->mc_ifc_count)
2484 mld_ifc_start_timer(idev,
2485 unsolicited_report_interval(idev));
2486 }
2487 in6_dev_put(idev);
2488 }
2489
2490 static void mld_ifc_event(struct inet6_dev *idev)
2491 {
2492 if (mld_in_v1_mode(idev))
2493 return;
2494 idev->mc_ifc_count = idev->mc_qrv;
2495 mld_ifc_start_timer(idev, 1);
2496 }
2497
2498 static void igmp6_timer_handler(struct timer_list *t)
2499 {
2500 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2501
2502 if (mld_in_v1_mode(ma->idev))
2503 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2504 else
2505 mld_send_report(ma->idev, ma);
2506
2507 spin_lock(&ma->mca_lock);
2508 ma->mca_flags |= MAF_LAST_REPORTER;
2509 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2510 spin_unlock(&ma->mca_lock);
2511 ma_put(ma);
2512 }
2513
2514 /* Device changing type */
2515
2516 void ipv6_mc_unmap(struct inet6_dev *idev)
2517 {
2518 struct ifmcaddr6 *i;
2519
2520 /* Install multicast list, except for all-nodes (already installed) */
2521
2522 read_lock_bh(&idev->lock);
2523 for (i = idev->mc_list; i; i = i->next)
2524 igmp6_group_dropped(i);
2525 read_unlock_bh(&idev->lock);
2526 }
2527
2528 void ipv6_mc_remap(struct inet6_dev *idev)
2529 {
2530 ipv6_mc_up(idev);
2531 }
2532
2533 /* Device going down */
2534
2535 void ipv6_mc_down(struct inet6_dev *idev)
2536 {
2537 struct ifmcaddr6 *i;
2538
2539 /* Withdraw multicast list */
2540
2541 read_lock_bh(&idev->lock);
2542
2543 for (i = idev->mc_list; i; i = i->next)
2544 igmp6_group_dropped(i);
2545
2546 /* Should stop timer after group drop. or we will
2547 * start timer again in mld_ifc_event()
2548 */
2549 mld_ifc_stop_timer(idev);
2550 mld_gq_stop_timer(idev);
2551 mld_dad_stop_timer(idev);
2552 read_unlock_bh(&idev->lock);
2553 }
2554
2555 static void ipv6_mc_reset(struct inet6_dev *idev)
2556 {
2557 idev->mc_qrv = sysctl_mld_qrv;
2558 idev->mc_qi = MLD_QI_DEFAULT;
2559 idev->mc_qri = MLD_QRI_DEFAULT;
2560 idev->mc_v1_seen = 0;
2561 idev->mc_maxdelay = unsolicited_report_interval(idev);
2562 }
2563
2564 /* Device going up */
2565
2566 void ipv6_mc_up(struct inet6_dev *idev)
2567 {
2568 struct ifmcaddr6 *i;
2569
2570 /* Install multicast list, except for all-nodes (already installed) */
2571
2572 read_lock_bh(&idev->lock);
2573 ipv6_mc_reset(idev);
2574 for (i = idev->mc_list; i; i = i->next) {
2575 mld_del_delrec(idev, i);
2576 igmp6_group_added(i);
2577 }
2578 read_unlock_bh(&idev->lock);
2579 }
2580
2581 /* IPv6 device initialization. */
2582
2583 void ipv6_mc_init_dev(struct inet6_dev *idev)
2584 {
2585 write_lock_bh(&idev->lock);
2586 spin_lock_init(&idev->mc_lock);
2587 idev->mc_gq_running = 0;
2588 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2589 idev->mc_tomb = NULL;
2590 idev->mc_ifc_count = 0;
2591 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2592 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2593 ipv6_mc_reset(idev);
2594 write_unlock_bh(&idev->lock);
2595 }
2596
2597 /*
2598 * Device is about to be destroyed: clean up.
2599 */
2600
2601 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2602 {
2603 struct ifmcaddr6 *i;
2604
2605 /* Deactivate timers */
2606 ipv6_mc_down(idev);
2607 mld_clear_delrec(idev);
2608
2609 /* Delete all-nodes address. */
2610 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2611 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2612 * fail.
2613 */
2614 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2615
2616 if (idev->cnf.forwarding)
2617 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2618
2619 write_lock_bh(&idev->lock);
2620 while ((i = idev->mc_list) != NULL) {
2621 idev->mc_list = i->next;
2622
2623 write_unlock_bh(&idev->lock);
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