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Merge tag 'iommu-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux/fpc-iii.git] / net / ipv6 / mcast.c
blob6c8604390266fa7e3c64937353b5f62508f9a4f5
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Multicast support for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
10 */
11
12 /* Changes:
13 *
14 * yoshfuji : fix format of router-alert option
15 * YOSHIFUJI Hideaki @USAGI:
16 * Fixed source address for MLD message based on
17 * <draft-ietf-magma-mld-source-05.txt>.
18 * YOSHIFUJI Hideaki @USAGI:
19 * - Ignore Queries for invalid addresses.
20 * - MLD for link-local addresses.
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - MLDv2 support
23 */
24
25 #include <linux/module.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/string.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/jiffies.h>
32 #include <linux/times.h>
33 #include <linux/net.h>
34 #include <linux/in.h>
35 #include <linux/in6.h>
36 #include <linux/netdevice.h>
37 #include <linux/if_arp.h>
38 #include <linux/route.h>
39 #include <linux/init.h>
40 #include <linux/proc_fs.h>
41 #include <linux/seq_file.h>
42 #include <linux/slab.h>
43 #include <linux/pkt_sched.h>
44 #include <net/mld.h>
45
46 #include <linux/netfilter.h>
47 #include <linux/netfilter_ipv6.h>
48
49 #include <net/net_namespace.h>
50 #include <net/sock.h>
51 #include <net/snmp.h>
52
53 #include <net/ipv6.h>
54 #include <net/protocol.h>
55 #include <net/if_inet6.h>
56 #include <net/ndisc.h>
57 #include <net/addrconf.h>
58 #include <net/ip6_route.h>
59 #include <net/inet_common.h>
60
61 #include <net/ip6_checksum.h>
62
63 /* Ensure that we have struct in6_addr aligned on 32bit word. */
64 static int __mld2_query_bugs[] __attribute__((__unused__)) = {
65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
68 };
69
70 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
71
72 static void igmp6_join_group(struct ifmcaddr6 *ma);
73 static void igmp6_leave_group(struct ifmcaddr6 *ma);
74 static void igmp6_timer_handler(struct timer_list *t);
75
76 static void mld_gq_timer_expire(struct timer_list *t);
77 static void mld_ifc_timer_expire(struct timer_list *t);
78 static void mld_ifc_event(struct inet6_dev *idev);
79 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
80 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
81 static void mld_clear_delrec(struct inet6_dev *idev);
82 static bool mld_in_v1_mode(const struct inet6_dev *idev);
83 static int sf_setstate(struct ifmcaddr6 *pmc);
84 static void sf_markstate(struct ifmcaddr6 *pmc);
85 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
86 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
87 int sfmode, int sfcount, const struct in6_addr *psfsrc,
88 int delta);
89 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
90 int sfmode, int sfcount, const struct in6_addr *psfsrc,
91 int delta);
92 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
93 struct inet6_dev *idev);
94 static int __ipv6_dev_mc_inc(struct net_device *dev,
95 const struct in6_addr *addr, unsigned int mode);
96
97 #define MLD_QRV_DEFAULT 2
98 /* RFC3810, 9.2. Query Interval */
99 #define MLD_QI_DEFAULT (125 * HZ)
100 /* RFC3810, 9.3. Query Response Interval */
101 #define MLD_QRI_DEFAULT (10 * HZ)
102
103 /* RFC3810, 8.1 Query Version Distinctions */
104 #define MLD_V1_QUERY_LEN 24
105 #define MLD_V2_QUERY_LEN_MIN 28
106
107 #define IPV6_MLD_MAX_MSF 64
108
109 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
110 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
111
112 /*
113 * socket join on multicast group
114 */
115
116 #define for_each_pmc_rcu(np, pmc) \
117 for (pmc = rcu_dereference(np->ipv6_mc_list); \
118 pmc != NULL; \
119 pmc = rcu_dereference(pmc->next))
120
121 static int unsolicited_report_interval(struct inet6_dev *idev)
122 {
123 int iv;
124
125 if (mld_in_v1_mode(idev))
126 iv = idev->cnf.mldv1_unsolicited_report_interval;
127 else
128 iv = idev->cnf.mldv2_unsolicited_report_interval;
129
130 return iv > 0 ? iv : 1;
131 }
132
133 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
134 const struct in6_addr *addr, unsigned int mode)
135 {
136 struct net_device *dev = NULL;
137 struct ipv6_mc_socklist *mc_lst;
138 struct ipv6_pinfo *np = inet6_sk(sk);
139 struct net *net = sock_net(sk);
140 int err;
141
142 ASSERT_RTNL();
143
144 if (!ipv6_addr_is_multicast(addr))
145 return -EINVAL;
146
147 rcu_read_lock();
148 for_each_pmc_rcu(np, mc_lst) {
149 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
150 ipv6_addr_equal(&mc_lst->addr, addr)) {
151 rcu_read_unlock();
152 return -EADDRINUSE;
153 }
154 }
155 rcu_read_unlock();
156
157 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
158
159 if (!mc_lst)
160 return -ENOMEM;
161
162 mc_lst->next = NULL;
163 mc_lst->addr = *addr;
164
165 if (ifindex == 0) {
166 struct rt6_info *rt;
167 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
168 if (rt) {
169 dev = rt->dst.dev;
170 ip6_rt_put(rt);
171 }
172 } else
173 dev = __dev_get_by_index(net, ifindex);
174
175 if (!dev) {
176 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
177 return -ENODEV;
178 }
179
180 mc_lst->ifindex = dev->ifindex;
181 mc_lst->sfmode = mode;
182 rwlock_init(&mc_lst->sflock);
183 mc_lst->sflist = NULL;
184
185 /*
186 * now add/increase the group membership on the device
187 */
188
189 err = __ipv6_dev_mc_inc(dev, addr, mode);
190
191 if (err) {
192 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
193 return err;
194 }
195
196 mc_lst->next = np->ipv6_mc_list;
197 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
198
199 return 0;
200 }
201
202 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
203 {
204 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
205 }
206 EXPORT_SYMBOL(ipv6_sock_mc_join);
207
208 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
209 const struct in6_addr *addr, unsigned int mode)
210 {
211 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
212 }
213
214 /*
215 * socket leave on multicast group
216 */
217 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
218 {
219 struct ipv6_pinfo *np = inet6_sk(sk);
220 struct ipv6_mc_socklist *mc_lst;
221 struct ipv6_mc_socklist __rcu **lnk;
222 struct net *net = sock_net(sk);
223
224 ASSERT_RTNL();
225
226 if (!ipv6_addr_is_multicast(addr))
227 return -EINVAL;
228
229 for (lnk = &np->ipv6_mc_list;
230 (mc_lst = rtnl_dereference(*lnk)) != NULL;
231 lnk = &mc_lst->next) {
232 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
233 ipv6_addr_equal(&mc_lst->addr, addr)) {
234 struct net_device *dev;
235
236 *lnk = mc_lst->next;
237
238 dev = __dev_get_by_index(net, mc_lst->ifindex);
239 if (dev) {
240 struct inet6_dev *idev = __in6_dev_get(dev);
241
242 (void) ip6_mc_leave_src(sk, mc_lst, idev);
243 if (idev)
244 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
245 } else
246 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
247
248 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
249 kfree_rcu(mc_lst, rcu);
250 return 0;
251 }
252 }
253
254 return -EADDRNOTAVAIL;
255 }
256 EXPORT_SYMBOL(ipv6_sock_mc_drop);
257
258 /* called with rcu_read_lock() */
259 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
260 const struct in6_addr *group,
261 int ifindex)
262 {
263 struct net_device *dev = NULL;
264 struct inet6_dev *idev = NULL;
265
266 if (ifindex == 0) {
267 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
268
269 if (rt) {
270 dev = rt->dst.dev;
271 ip6_rt_put(rt);
272 }
273 } else
274 dev = dev_get_by_index_rcu(net, ifindex);
275
276 if (!dev)
277 return NULL;
278 idev = __in6_dev_get(dev);
279 if (!idev)
280 return NULL;
281 read_lock_bh(&idev->lock);
282 if (idev->dead) {
283 read_unlock_bh(&idev->lock);
284 return NULL;
285 }
286 return idev;
287 }
288
289 void __ipv6_sock_mc_close(struct sock *sk)
290 {
291 struct ipv6_pinfo *np = inet6_sk(sk);
292 struct ipv6_mc_socklist *mc_lst;
293 struct net *net = sock_net(sk);
294
295 ASSERT_RTNL();
296
297 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
298 struct net_device *dev;
299
300 np->ipv6_mc_list = mc_lst->next;
301
302 dev = __dev_get_by_index(net, mc_lst->ifindex);
303 if (dev) {
304 struct inet6_dev *idev = __in6_dev_get(dev);
305
306 (void) ip6_mc_leave_src(sk, mc_lst, idev);
307 if (idev)
308 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
309 } else
310 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
311
312 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
313 kfree_rcu(mc_lst, rcu);
314 }
315 }
316
317 void ipv6_sock_mc_close(struct sock *sk)
318 {
319 struct ipv6_pinfo *np = inet6_sk(sk);
320
321 if (!rcu_access_pointer(np->ipv6_mc_list))
322 return;
323 rtnl_lock();
324 __ipv6_sock_mc_close(sk);
325 rtnl_unlock();
326 }
327
328 int ip6_mc_source(int add, int omode, struct sock *sk,
329 struct group_source_req *pgsr)
330 {
331 struct in6_addr *source, *group;
332 struct ipv6_mc_socklist *pmc;
333 struct inet6_dev *idev;
334 struct ipv6_pinfo *inet6 = inet6_sk(sk);
335 struct ip6_sf_socklist *psl;
336 struct net *net = sock_net(sk);
337 int i, j, rv;
338 int leavegroup = 0;
339 int pmclocked = 0;
340 int err;
341
342 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
343 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
344
345 if (!ipv6_addr_is_multicast(group))
346 return -EINVAL;
347
348 rcu_read_lock();
349 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
350 if (!idev) {
351 rcu_read_unlock();
352 return -ENODEV;
353 }
354
355 err = -EADDRNOTAVAIL;
356
357 for_each_pmc_rcu(inet6, pmc) {
358 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
359 continue;
360 if (ipv6_addr_equal(&pmc->addr, group))
361 break;
362 }
363 if (!pmc) { /* must have a prior join */
364 err = -EINVAL;
365 goto done;
366 }
367 /* if a source filter was set, must be the same mode as before */
368 if (pmc->sflist) {
369 if (pmc->sfmode != omode) {
370 err = -EINVAL;
371 goto done;
372 }
373 } else if (pmc->sfmode != omode) {
374 /* allow mode switches for empty-set filters */
375 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
376 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
377 pmc->sfmode = omode;
378 }
379
380 write_lock(&pmc->sflock);
381 pmclocked = 1;
382
383 psl = pmc->sflist;
384 if (!add) {
385 if (!psl)
386 goto done; /* err = -EADDRNOTAVAIL */
387 rv = !0;
388 for (i = 0; i < psl->sl_count; i++) {
389 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
390 if (rv == 0)
391 break;
392 }
393 if (rv) /* source not found */
394 goto done; /* err = -EADDRNOTAVAIL */
395
396 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
397 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
398 leavegroup = 1;
399 goto done;
400 }
401
402 /* update the interface filter */
403 ip6_mc_del_src(idev, group, omode, 1, source, 1);
404
405 for (j = i+1; j < psl->sl_count; j++)
406 psl->sl_addr[j-1] = psl->sl_addr[j];
407 psl->sl_count--;
408 err = 0;
409 goto done;
410 }
411 /* else, add a new source to the filter */
412
413 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
414 err = -ENOBUFS;
415 goto done;
416 }
417 if (!psl || psl->sl_count == psl->sl_max) {
418 struct ip6_sf_socklist *newpsl;
419 int count = IP6_SFBLOCK;
420
421 if (psl)
422 count += psl->sl_max;
423 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
424 if (!newpsl) {
425 err = -ENOBUFS;
426 goto done;
427 }
428 newpsl->sl_max = count;
429 newpsl->sl_count = count - IP6_SFBLOCK;
430 if (psl) {
431 for (i = 0; i < psl->sl_count; i++)
432 newpsl->sl_addr[i] = psl->sl_addr[i];
433 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
434 }
435 pmc->sflist = psl = newpsl;
436 }
437 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
438 for (i = 0; i < psl->sl_count; i++) {
439 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
440 if (rv == 0) /* There is an error in the address. */
441 goto done;
442 }
443 for (j = psl->sl_count-1; j >= i; j--)
444 psl->sl_addr[j+1] = psl->sl_addr[j];
445 psl->sl_addr[i] = *source;
446 psl->sl_count++;
447 err = 0;
448 /* update the interface list */
449 ip6_mc_add_src(idev, group, omode, 1, source, 1);
450 done:
451 if (pmclocked)
452 write_unlock(&pmc->sflock);
453 read_unlock_bh(&idev->lock);
454 rcu_read_unlock();
455 if (leavegroup)
456 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
457 return err;
458 }
459
460 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
461 struct sockaddr_storage *list)
462 {
463 const struct in6_addr *group;
464 struct ipv6_mc_socklist *pmc;
465 struct inet6_dev *idev;
466 struct ipv6_pinfo *inet6 = inet6_sk(sk);
467 struct ip6_sf_socklist *newpsl, *psl;
468 struct net *net = sock_net(sk);
469 int leavegroup = 0;
470 int i, err;
471
472 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
473
474 if (!ipv6_addr_is_multicast(group))
475 return -EINVAL;
476 if (gsf->gf_fmode != MCAST_INCLUDE &&
477 gsf->gf_fmode != MCAST_EXCLUDE)
478 return -EINVAL;
479
480 rcu_read_lock();
481 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
482
483 if (!idev) {
484 rcu_read_unlock();
485 return -ENODEV;
486 }
487
488 err = 0;
489
490 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
491 leavegroup = 1;
492 goto done;
493 }
494
495 for_each_pmc_rcu(inet6, pmc) {
496 if (pmc->ifindex != gsf->gf_interface)
497 continue;
498 if (ipv6_addr_equal(&pmc->addr, group))
499 break;
500 }
501 if (!pmc) { /* must have a prior join */
502 err = -EINVAL;
503 goto done;
504 }
505 if (gsf->gf_numsrc) {
506 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
507 GFP_ATOMIC);
508 if (!newpsl) {
509 err = -ENOBUFS;
510 goto done;
511 }
512 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
513 for (i = 0; i < newpsl->sl_count; ++i, ++list) {
514 struct sockaddr_in6 *psin6;
515
516 psin6 = (struct sockaddr_in6 *)list;
517 newpsl->sl_addr[i] = psin6->sin6_addr;
518 }
519 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
520 newpsl->sl_count, newpsl->sl_addr, 0);
521 if (err) {
522 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
523 goto done;
524 }
525 } else {
526 newpsl = NULL;
527 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
528 }
529
530 write_lock(&pmc->sflock);
531 psl = pmc->sflist;
532 if (psl) {
533 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
534 psl->sl_count, psl->sl_addr, 0);
535 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
536 } else
537 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
538 pmc->sflist = newpsl;
539 pmc->sfmode = gsf->gf_fmode;
540 write_unlock(&pmc->sflock);
541 err = 0;
542 done:
543 read_unlock_bh(&idev->lock);
544 rcu_read_unlock();
545 if (leavegroup)
546 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
547 return err;
548 }
549
550 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
551 struct sockaddr_storage __user *p)
552 {
553 int err, i, count, copycount;
554 const struct in6_addr *group;
555 struct ipv6_mc_socklist *pmc;
556 struct inet6_dev *idev;
557 struct ipv6_pinfo *inet6 = inet6_sk(sk);
558 struct ip6_sf_socklist *psl;
559 struct net *net = sock_net(sk);
560
561 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
562
563 if (!ipv6_addr_is_multicast(group))
564 return -EINVAL;
565
566 rcu_read_lock();
567 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
568
569 if (!idev) {
570 rcu_read_unlock();
571 return -ENODEV;
572 }
573
574 err = -EADDRNOTAVAIL;
575 /* changes to the ipv6_mc_list require the socket lock and
576 * rtnl lock. We have the socket lock and rcu read lock,
577 * so reading the list is safe.
578 */
579
580 for_each_pmc_rcu(inet6, pmc) {
581 if (pmc->ifindex != gsf->gf_interface)
582 continue;
583 if (ipv6_addr_equal(group, &pmc->addr))
584 break;
585 }
586 if (!pmc) /* must have a prior join */
587 goto done;
588 gsf->gf_fmode = pmc->sfmode;
589 psl = pmc->sflist;
590 count = psl ? psl->sl_count : 0;
591 read_unlock_bh(&idev->lock);
592 rcu_read_unlock();
593
594 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
595 gsf->gf_numsrc = count;
596 /* changes to psl require the socket lock, and a write lock
597 * on pmc->sflock. We have the socket lock so reading here is safe.
598 */
599 for (i = 0; i < copycount; i++, p++) {
600 struct sockaddr_in6 *psin6;
601 struct sockaddr_storage ss;
602
603 psin6 = (struct sockaddr_in6 *)&ss;
604 memset(&ss, 0, sizeof(ss));
605 psin6->sin6_family = AF_INET6;
606 psin6->sin6_addr = psl->sl_addr[i];
607 if (copy_to_user(p, &ss, sizeof(ss)))
608 return -EFAULT;
609 }
610 return 0;
611 done:
612 read_unlock_bh(&idev->lock);
613 rcu_read_unlock();
614 return err;
615 }
616
617 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
618 const struct in6_addr *src_addr)
619 {
620 struct ipv6_pinfo *np = inet6_sk(sk);
621 struct ipv6_mc_socklist *mc;
622 struct ip6_sf_socklist *psl;
623 bool rv = true;
624
625 rcu_read_lock();
626 for_each_pmc_rcu(np, mc) {
627 if (ipv6_addr_equal(&mc->addr, mc_addr))
628 break;
629 }
630 if (!mc) {
631 rcu_read_unlock();
632 return np->mc_all;
633 }
634 read_lock(&mc->sflock);
635 psl = mc->sflist;
636 if (!psl) {
637 rv = mc->sfmode == MCAST_EXCLUDE;
638 } else {
639 int i;
640
641 for (i = 0; i < psl->sl_count; i++) {
642 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
643 break;
644 }
645 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
646 rv = false;
647 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
648 rv = false;
649 }
650 read_unlock(&mc->sflock);
651 rcu_read_unlock();
652
653 return rv;
654 }
655
656 static void igmp6_group_added(struct ifmcaddr6 *mc)
657 {
658 struct net_device *dev = mc->idev->dev;
659 char buf[MAX_ADDR_LEN];
660
661 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
662 IPV6_ADDR_SCOPE_LINKLOCAL)
663 return;
664
665 spin_lock_bh(&mc->mca_lock);
666 if (!(mc->mca_flags&MAF_LOADED)) {
667 mc->mca_flags |= MAF_LOADED;
668 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
669 dev_mc_add(dev, buf);
670 }
671 spin_unlock_bh(&mc->mca_lock);
672
673 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
674 return;
675
676 if (mld_in_v1_mode(mc->idev)) {
677 igmp6_join_group(mc);
678 return;
679 }
680 /* else v2 */
681
682 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
683 * should not send filter-mode change record as the mode
684 * should be from IN() to IN(A).
685 */
686 if (mc->mca_sfmode == MCAST_EXCLUDE)
687 mc->mca_crcount = mc->idev->mc_qrv;
688
689 mld_ifc_event(mc->idev);
690 }
691
692 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
693 {
694 struct net_device *dev = mc->idev->dev;
695 char buf[MAX_ADDR_LEN];
696
697 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
698 IPV6_ADDR_SCOPE_LINKLOCAL)
699 return;
700
701 spin_lock_bh(&mc->mca_lock);
702 if (mc->mca_flags&MAF_LOADED) {
703 mc->mca_flags &= ~MAF_LOADED;
704 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
705 dev_mc_del(dev, buf);
706 }
707
708 spin_unlock_bh(&mc->mca_lock);
709 if (mc->mca_flags & MAF_NOREPORT)
710 return;
711
712 if (!mc->idev->dead)
713 igmp6_leave_group(mc);
714
715 spin_lock_bh(&mc->mca_lock);
716 if (del_timer(&mc->mca_timer))
717 refcount_dec(&mc->mca_refcnt);
718 spin_unlock_bh(&mc->mca_lock);
719 }
720
721 /*
722 * deleted ifmcaddr6 manipulation
723 */
724 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
725 {
726 struct ifmcaddr6 *pmc;
727
728 /* this is an "ifmcaddr6" for convenience; only the fields below
729 * are actually used. In particular, the refcnt and users are not
730 * used for management of the delete list. Using the same structure
731 * for deleted items allows change reports to use common code with
732 * non-deleted or query-response MCA's.
733 */
734 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
735 if (!pmc)
736 return;
737
738 spin_lock_bh(&im->mca_lock);
739 spin_lock_init(&pmc->mca_lock);
740 pmc->idev = im->idev;
741 in6_dev_hold(idev);
742 pmc->mca_addr = im->mca_addr;
743 pmc->mca_crcount = idev->mc_qrv;
744 pmc->mca_sfmode = im->mca_sfmode;
745 if (pmc->mca_sfmode == MCAST_INCLUDE) {
746 struct ip6_sf_list *psf;
747
748 pmc->mca_tomb = im->mca_tomb;
749 pmc->mca_sources = im->mca_sources;
750 im->mca_tomb = im->mca_sources = NULL;
751 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
752 psf->sf_crcount = pmc->mca_crcount;
753 }
754 spin_unlock_bh(&im->mca_lock);
755
756 spin_lock_bh(&idev->mc_lock);
757 pmc->next = idev->mc_tomb;
758 idev->mc_tomb = pmc;
759 spin_unlock_bh(&idev->mc_lock);
760 }
761
762 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
763 {
764 struct ifmcaddr6 *pmc, *pmc_prev;
765 struct ip6_sf_list *psf;
766 struct in6_addr *pmca = &im->mca_addr;
767
768 spin_lock_bh(&idev->mc_lock);
769 pmc_prev = NULL;
770 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
771 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
772 break;
773 pmc_prev = pmc;
774 }
775 if (pmc) {
776 if (pmc_prev)
777 pmc_prev->next = pmc->next;
778 else
779 idev->mc_tomb = pmc->next;
780 }
781 spin_unlock_bh(&idev->mc_lock);
782
783 spin_lock_bh(&im->mca_lock);
784 if (pmc) {
785 im->idev = pmc->idev;
786 if (im->mca_sfmode == MCAST_INCLUDE) {
787 swap(im->mca_tomb, pmc->mca_tomb);
788 swap(im->mca_sources, pmc->mca_sources);
789 for (psf = im->mca_sources; psf; psf = psf->sf_next)
790 psf->sf_crcount = idev->mc_qrv;
791 } else {
792 im->mca_crcount = idev->mc_qrv;
793 }
794 in6_dev_put(pmc->idev);
795 ip6_mc_clear_src(pmc);
796 kfree(pmc);
797 }
798 spin_unlock_bh(&im->mca_lock);
799 }
800
801 static void mld_clear_delrec(struct inet6_dev *idev)
802 {
803 struct ifmcaddr6 *pmc, *nextpmc;
804
805 spin_lock_bh(&idev->mc_lock);
806 pmc = idev->mc_tomb;
807 idev->mc_tomb = NULL;
808 spin_unlock_bh(&idev->mc_lock);
809
810 for (; pmc; pmc = nextpmc) {
811 nextpmc = pmc->next;
812 ip6_mc_clear_src(pmc);
813 in6_dev_put(pmc->idev);
814 kfree(pmc);
815 }
816
817 /* clear dead sources, too */
818 read_lock_bh(&idev->lock);
819 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
820 struct ip6_sf_list *psf, *psf_next;
821
822 spin_lock_bh(&pmc->mca_lock);
823 psf = pmc->mca_tomb;
824 pmc->mca_tomb = NULL;
825 spin_unlock_bh(&pmc->mca_lock);
826 for (; psf; psf = psf_next) {
827 psf_next = psf->sf_next;
828 kfree(psf);
829 }
830 }
831 read_unlock_bh(&idev->lock);
832 }
833
834 static void mca_get(struct ifmcaddr6 *mc)
835 {
836 refcount_inc(&mc->mca_refcnt);
837 }
838
839 static void ma_put(struct ifmcaddr6 *mc)
840 {
841 if (refcount_dec_and_test(&mc->mca_refcnt)) {
842 in6_dev_put(mc->idev);
843 kfree(mc);
844 }
845 }
846
847 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
848 const struct in6_addr *addr,
849 unsigned int mode)
850 {
851 struct ifmcaddr6 *mc;
852
853 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
854 if (!mc)
855 return NULL;
856
857 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
858
859 mc->mca_addr = *addr;
860 mc->idev = idev; /* reference taken by caller */
861 mc->mca_users = 1;
862 /* mca_stamp should be updated upon changes */
863 mc->mca_cstamp = mc->mca_tstamp = jiffies;
864 refcount_set(&mc->mca_refcnt, 1);
865 spin_lock_init(&mc->mca_lock);
866
867 mc->mca_sfmode = mode;
868 mc->mca_sfcount[mode] = 1;
869
870 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
871 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
872 mc->mca_flags |= MAF_NOREPORT;
873
874 return mc;
875 }
876
877 /*
878 * device multicast group inc (add if not found)
879 */
880 static int __ipv6_dev_mc_inc(struct net_device *dev,
881 const struct in6_addr *addr, unsigned int mode)
882 {
883 struct ifmcaddr6 *mc;
884 struct inet6_dev *idev;
885
886 ASSERT_RTNL();
887
888 /* we need to take a reference on idev */
889 idev = in6_dev_get(dev);
890
891 if (!idev)
892 return -EINVAL;
893
894 write_lock_bh(&idev->lock);
895 if (idev->dead) {
896 write_unlock_bh(&idev->lock);
897 in6_dev_put(idev);
898 return -ENODEV;
899 }
900
901 for (mc = idev->mc_list; mc; mc = mc->next) {
902 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
903 mc->mca_users++;
904 write_unlock_bh(&idev->lock);
905 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
906 in6_dev_put(idev);
907 return 0;
908 }
909 }
910
911 mc = mca_alloc(idev, addr, mode);
912 if (!mc) {
913 write_unlock_bh(&idev->lock);
914 in6_dev_put(idev);
915 return -ENOMEM;
916 }
917
918 mc->next = idev->mc_list;
919 idev->mc_list = mc;
920
921 /* Hold this for the code below before we unlock,
922 * it is already exposed via idev->mc_list.
923 */
924 mca_get(mc);
925 write_unlock_bh(&idev->lock);
926
927 mld_del_delrec(idev, mc);
928 igmp6_group_added(mc);
929 ma_put(mc);
930 return 0;
931 }
932
933 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
934 {
935 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
936 }
937 EXPORT_SYMBOL(ipv6_dev_mc_inc);
938
939 /*
940 * device multicast group del
941 */
942 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
943 {
944 struct ifmcaddr6 *ma, **map;
945
946 ASSERT_RTNL();
947
948 write_lock_bh(&idev->lock);
949 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
950 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
951 if (--ma->mca_users == 0) {
952 *map = ma->next;
953 write_unlock_bh(&idev->lock);
954
955 igmp6_group_dropped(ma);
956 ip6_mc_clear_src(ma);
957
958 ma_put(ma);
959 return 0;
960 }
961 write_unlock_bh(&idev->lock);
962 return 0;
963 }
964 }
965 write_unlock_bh(&idev->lock);
966
967 return -ENOENT;
968 }
969
970 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
971 {
972 struct inet6_dev *idev;
973 int err;
974
975 ASSERT_RTNL();
976
977 idev = __in6_dev_get(dev);
978 if (!idev)
979 err = -ENODEV;
980 else
981 err = __ipv6_dev_mc_dec(idev, addr);
982
983 return err;
984 }
985 EXPORT_SYMBOL(ipv6_dev_mc_dec);
986
987 /*
988 * check if the interface/address pair is valid
989 */
990 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
991 const struct in6_addr *src_addr)
992 {
993 struct inet6_dev *idev;
994 struct ifmcaddr6 *mc;
995 bool rv = false;
996
997 rcu_read_lock();
998 idev = __in6_dev_get(dev);
999 if (idev) {
1000 read_lock_bh(&idev->lock);
1001 for (mc = idev->mc_list; mc; mc = mc->next) {
1002 if (ipv6_addr_equal(&mc->mca_addr, group))
1003 break;
1004 }
1005 if (mc) {
1006 if (src_addr && !ipv6_addr_any(src_addr)) {
1007 struct ip6_sf_list *psf;
1008
1009 spin_lock_bh(&mc->mca_lock);
1010 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1011 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1012 break;
1013 }
1014 if (psf)
1015 rv = psf->sf_count[MCAST_INCLUDE] ||
1016 psf->sf_count[MCAST_EXCLUDE] !=
1017 mc->mca_sfcount[MCAST_EXCLUDE];
1018 else
1019 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1020 spin_unlock_bh(&mc->mca_lock);
1021 } else
1022 rv = true; /* don't filter unspecified source */
1023 }
1024 read_unlock_bh(&idev->lock);
1025 }
1026 rcu_read_unlock();
1027 return rv;
1028 }
1029
1030 static void mld_gq_start_timer(struct inet6_dev *idev)
1031 {
1032 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1033
1034 idev->mc_gq_running = 1;
1035 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1036 in6_dev_hold(idev);
1037 }
1038
1039 static void mld_gq_stop_timer(struct inet6_dev *idev)
1040 {
1041 idev->mc_gq_running = 0;
1042 if (del_timer(&idev->mc_gq_timer))
1043 __in6_dev_put(idev);
1044 }
1045
1046 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1047 {
1048 unsigned long tv = prandom_u32() % delay;
1049
1050 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1051 in6_dev_hold(idev);
1052 }
1053
1054 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1055 {
1056 idev->mc_ifc_count = 0;
1057 if (del_timer(&idev->mc_ifc_timer))
1058 __in6_dev_put(idev);
1059 }
1060
1061 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1062 {
1063 unsigned long tv = prandom_u32() % delay;
1064
1065 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1066 in6_dev_hold(idev);
1067 }
1068
1069 static void mld_dad_stop_timer(struct inet6_dev *idev)
1070 {
1071 if (del_timer(&idev->mc_dad_timer))
1072 __in6_dev_put(idev);
1073 }
1074
1075 /*
1076 * IGMP handling (alias multicast ICMPv6 messages)
1077 */
1078
1079 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1080 {
1081 unsigned long delay = resptime;
1082
1083 /* Do not start timer for these addresses */
1084 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1085 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1086 return;
1087
1088 if (del_timer(&ma->mca_timer)) {
1089 refcount_dec(&ma->mca_refcnt);
1090 delay = ma->mca_timer.expires - jiffies;
1091 }
1092
1093 if (delay >= resptime)
1094 delay = prandom_u32() % resptime;
1095
1096 ma->mca_timer.expires = jiffies + delay;
1097 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1098 refcount_inc(&ma->mca_refcnt);
1099 ma->mca_flags |= MAF_TIMER_RUNNING;
1100 }
1101
1102 /* mark EXCLUDE-mode sources */
1103 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1104 const struct in6_addr *srcs)
1105 {
1106 struct ip6_sf_list *psf;
1107 int i, scount;
1108
1109 scount = 0;
1110 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1111 if (scount == nsrcs)
1112 break;
1113 for (i = 0; i < nsrcs; i++) {
1114 /* skip inactive filters */
1115 if (psf->sf_count[MCAST_INCLUDE] ||
1116 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1117 psf->sf_count[MCAST_EXCLUDE])
1118 break;
1119 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1120 scount++;
1121 break;
1122 }
1123 }
1124 }
1125 pmc->mca_flags &= ~MAF_GSQUERY;
1126 if (scount == nsrcs) /* all sources excluded */
1127 return false;
1128 return true;
1129 }
1130
1131 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1132 const struct in6_addr *srcs)
1133 {
1134 struct ip6_sf_list *psf;
1135 int i, scount;
1136
1137 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1138 return mld_xmarksources(pmc, nsrcs, srcs);
1139
1140 /* mark INCLUDE-mode sources */
1141
1142 scount = 0;
1143 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1144 if (scount == nsrcs)
1145 break;
1146 for (i = 0; i < nsrcs; i++) {
1147 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1148 psf->sf_gsresp = 1;
1149 scount++;
1150 break;
1151 }
1152 }
1153 }
1154 if (!scount) {
1155 pmc->mca_flags &= ~MAF_GSQUERY;
1156 return false;
1157 }
1158 pmc->mca_flags |= MAF_GSQUERY;
1159 return true;
1160 }
1161
1162 static int mld_force_mld_version(const struct inet6_dev *idev)
1163 {
1164 /* Normally, both are 0 here. If enforcement to a particular is
1165 * being used, individual device enforcement will have a lower
1166 * precedence over 'all' device (.../conf/all/force_mld_version).
1167 */
1168
1169 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1170 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1171 else
1172 return idev->cnf.force_mld_version;
1173 }
1174
1175 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1176 {
1177 return mld_force_mld_version(idev) == 2;
1178 }
1179
1180 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1181 {
1182 return mld_force_mld_version(idev) == 1;
1183 }
1184
1185 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1186 {
1187 if (mld_in_v2_mode_only(idev))
1188 return false;
1189 if (mld_in_v1_mode_only(idev))
1190 return true;
1191 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1192 return true;
1193
1194 return false;
1195 }
1196
1197 static void mld_set_v1_mode(struct inet6_dev *idev)
1198 {
1199 /* RFC3810, relevant sections:
1200 * - 9.1. Robustness Variable
1201 * - 9.2. Query Interval
1202 * - 9.3. Query Response Interval
1203 * - 9.12. Older Version Querier Present Timeout
1204 */
1205 unsigned long switchback;
1206
1207 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1208
1209 idev->mc_v1_seen = jiffies + switchback;
1210 }
1211
1212 static void mld_update_qrv(struct inet6_dev *idev,
1213 const struct mld2_query *mlh2)
1214 {
1215 /* RFC3810, relevant sections:
1216 * - 5.1.8. QRV (Querier's Robustness Variable)
1217 * - 9.1. Robustness Variable
1218 */
1219
1220 /* The value of the Robustness Variable MUST NOT be zero,
1221 * and SHOULD NOT be one. Catch this here if we ever run
1222 * into such a case in future.
1223 */
1224 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1225 WARN_ON(idev->mc_qrv == 0);
1226
1227 if (mlh2->mld2q_qrv > 0)
1228 idev->mc_qrv = mlh2->mld2q_qrv;
1229
1230 if (unlikely(idev->mc_qrv < min_qrv)) {
1231 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1232 idev->mc_qrv, min_qrv);
1233 idev->mc_qrv = min_qrv;
1234 }
1235 }
1236
1237 static void mld_update_qi(struct inet6_dev *idev,
1238 const struct mld2_query *mlh2)
1239 {
1240 /* RFC3810, relevant sections:
1241 * - 5.1.9. QQIC (Querier's Query Interval Code)
1242 * - 9.2. Query Interval
1243 * - 9.12. Older Version Querier Present Timeout
1244 * (the [Query Interval] in the last Query received)
1245 */
1246 unsigned long mc_qqi;
1247
1248 if (mlh2->mld2q_qqic < 128) {
1249 mc_qqi = mlh2->mld2q_qqic;
1250 } else {
1251 unsigned long mc_man, mc_exp;
1252
1253 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1254 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1255
1256 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1257 }
1258
1259 idev->mc_qi = mc_qqi * HZ;
1260 }
1261
1262 static void mld_update_qri(struct inet6_dev *idev,
1263 const struct mld2_query *mlh2)
1264 {
1265 /* RFC3810, relevant sections:
1266 * - 5.1.3. Maximum Response Code
1267 * - 9.3. Query Response Interval
1268 */
1269 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1270 }
1271
1272 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1273 unsigned long *max_delay, bool v1_query)
1274 {
1275 unsigned long mldv1_md;
1276
1277 /* Ignore v1 queries */
1278 if (mld_in_v2_mode_only(idev))
1279 return -EINVAL;
1280
1281 mldv1_md = ntohs(mld->mld_maxdelay);
1282
1283 /* When in MLDv1 fallback and a MLDv2 router start-up being
1284 * unaware of current MLDv1 operation, the MRC == MRD mapping
1285 * only works when the exponential algorithm is not being
1286 * used (as MLDv1 is unaware of such things).
1287 *
1288 * According to the RFC author, the MLDv2 implementations
1289 * he's aware of all use a MRC < 32768 on start up queries.
1290 *
1291 * Thus, should we *ever* encounter something else larger
1292 * than that, just assume the maximum possible within our
1293 * reach.
1294 */
1295 if (!v1_query)
1296 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1297
1298 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1299
1300 /* MLDv1 router present: we need to go into v1 mode *only*
1301 * when an MLDv1 query is received as per section 9.12. of
1302 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1303 * queries MUST be of exactly 24 octets.
1304 */
1305 if (v1_query)
1306 mld_set_v1_mode(idev);
1307
1308 /* cancel MLDv2 report timer */
1309 mld_gq_stop_timer(idev);
1310 /* cancel the interface change timer */
1311 mld_ifc_stop_timer(idev);
1312 /* clear deleted report items */
1313 mld_clear_delrec(idev);
1314
1315 return 0;
1316 }
1317
1318 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1319 unsigned long *max_delay)
1320 {
1321 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1322
1323 mld_update_qrv(idev, mld);
1324 mld_update_qi(idev, mld);
1325 mld_update_qri(idev, mld);
1326
1327 idev->mc_maxdelay = *max_delay;
1328
1329 return 0;
1330 }
1331
1332 /* called with rcu_read_lock() */
1333 int igmp6_event_query(struct sk_buff *skb)
1334 {
1335 struct mld2_query *mlh2 = NULL;
1336 struct ifmcaddr6 *ma;
1337 const struct in6_addr *group;
1338 unsigned long max_delay;
1339 struct inet6_dev *idev;
1340 struct mld_msg *mld;
1341 int group_type;
1342 int mark = 0;
1343 int len, err;
1344
1345 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1346 return -EINVAL;
1347
1348 /* compute payload length excluding extension headers */
1349 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1350 len -= skb_network_header_len(skb);
1351
1352 /* RFC3810 6.2
1353 * Upon reception of an MLD message that contains a Query, the node
1354 * checks if the source address of the message is a valid link-local
1355 * address, if the Hop Limit is set to 1, and if the Router Alert
1356 * option is present in the Hop-By-Hop Options header of the IPv6
1357 * packet. If any of these checks fails, the packet is dropped.
1358 */
1359 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1360 ipv6_hdr(skb)->hop_limit != 1 ||
1361 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1362 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1363 return -EINVAL;
1364
1365 idev = __in6_dev_get(skb->dev);
1366 if (!idev)
1367 return 0;
1368
1369 mld = (struct mld_msg *)icmp6_hdr(skb);
1370 group = &mld->mld_mca;
1371 group_type = ipv6_addr_type(group);
1372
1373 if (group_type != IPV6_ADDR_ANY &&
1374 !(group_type&IPV6_ADDR_MULTICAST))
1375 return -EINVAL;
1376
1377 if (len < MLD_V1_QUERY_LEN) {
1378 return -EINVAL;
1379 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1380 err = mld_process_v1(idev, mld, &max_delay,
1381 len == MLD_V1_QUERY_LEN);
1382 if (err < 0)
1383 return err;
1384 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1385 int srcs_offset = sizeof(struct mld2_query) -
1386 sizeof(struct icmp6hdr);
1387
1388 if (!pskb_may_pull(skb, srcs_offset))
1389 return -EINVAL;
1390
1391 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1392
1393 err = mld_process_v2(idev, mlh2, &max_delay);
1394 if (err < 0)
1395 return err;
1396
1397 if (group_type == IPV6_ADDR_ANY) { /* general query */
1398 if (mlh2->mld2q_nsrcs)
1399 return -EINVAL; /* no sources allowed */
1400
1401 mld_gq_start_timer(idev);
1402 return 0;
1403 }
1404 /* mark sources to include, if group & source-specific */
1405 if (mlh2->mld2q_nsrcs != 0) {
1406 if (!pskb_may_pull(skb, srcs_offset +
1407 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1408 return -EINVAL;
1409
1410 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1411 mark = 1;
1412 }
1413 } else {
1414 return -EINVAL;
1415 }
1416
1417 read_lock_bh(&idev->lock);
1418 if (group_type == IPV6_ADDR_ANY) {
1419 for (ma = idev->mc_list; ma; ma = ma->next) {
1420 spin_lock_bh(&ma->mca_lock);
1421 igmp6_group_queried(ma, max_delay);
1422 spin_unlock_bh(&ma->mca_lock);
1423 }
1424 } else {
1425 for (ma = idev->mc_list; ma; ma = ma->next) {
1426 if (!ipv6_addr_equal(group, &ma->mca_addr))
1427 continue;
1428 spin_lock_bh(&ma->mca_lock);
1429 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1430 /* gsquery <- gsquery && mark */
1431 if (!mark)
1432 ma->mca_flags &= ~MAF_GSQUERY;
1433 } else {
1434 /* gsquery <- mark */
1435 if (mark)
1436 ma->mca_flags |= MAF_GSQUERY;
1437 else
1438 ma->mca_flags &= ~MAF_GSQUERY;
1439 }
1440 if (!(ma->mca_flags & MAF_GSQUERY) ||
1441 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1442 igmp6_group_queried(ma, max_delay);
1443 spin_unlock_bh(&ma->mca_lock);
1444 break;
1445 }
1446 }
1447 read_unlock_bh(&idev->lock);
1448
1449 return 0;
1450 }
1451
1452 /* called with rcu_read_lock() */
1453 int igmp6_event_report(struct sk_buff *skb)
1454 {
1455 struct ifmcaddr6 *ma;
1456 struct inet6_dev *idev;
1457 struct mld_msg *mld;
1458 int addr_type;
1459
1460 /* Our own report looped back. Ignore it. */
1461 if (skb->pkt_type == PACKET_LOOPBACK)
1462 return 0;
1463
1464 /* send our report if the MC router may not have heard this report */
1465 if (skb->pkt_type != PACKET_MULTICAST &&
1466 skb->pkt_type != PACKET_BROADCAST)
1467 return 0;
1468
1469 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1470 return -EINVAL;
1471
1472 mld = (struct mld_msg *)icmp6_hdr(skb);
1473
1474 /* Drop reports with not link local source */
1475 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1476 if (addr_type != IPV6_ADDR_ANY &&
1477 !(addr_type&IPV6_ADDR_LINKLOCAL))
1478 return -EINVAL;
1479
1480 idev = __in6_dev_get(skb->dev);
1481 if (!idev)
1482 return -ENODEV;
1483
1484 /*
1485 * Cancel the timer for this group
1486 */
1487
1488 read_lock_bh(&idev->lock);
1489 for (ma = idev->mc_list; ma; ma = ma->next) {
1490 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1491 spin_lock(&ma->mca_lock);
1492 if (del_timer(&ma->mca_timer))
1493 refcount_dec(&ma->mca_refcnt);
1494 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1495 spin_unlock(&ma->mca_lock);
1496 break;
1497 }
1498 }
1499 read_unlock_bh(&idev->lock);
1500 return 0;
1501 }
1502
1503 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1504 int gdeleted, int sdeleted)
1505 {
1506 switch (type) {
1507 case MLD2_MODE_IS_INCLUDE:
1508 case MLD2_MODE_IS_EXCLUDE:
1509 if (gdeleted || sdeleted)
1510 return false;
1511 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1512 if (pmc->mca_sfmode == MCAST_INCLUDE)
1513 return true;
1514 /* don't include if this source is excluded
1515 * in all filters
1516 */
1517 if (psf->sf_count[MCAST_INCLUDE])
1518 return type == MLD2_MODE_IS_INCLUDE;
1519 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1520 psf->sf_count[MCAST_EXCLUDE];
1521 }
1522 return false;
1523 case MLD2_CHANGE_TO_INCLUDE:
1524 if (gdeleted || sdeleted)
1525 return false;
1526 return psf->sf_count[MCAST_INCLUDE] != 0;
1527 case MLD2_CHANGE_TO_EXCLUDE:
1528 if (gdeleted || sdeleted)
1529 return false;
1530 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1531 psf->sf_count[MCAST_INCLUDE])
1532 return false;
1533 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1534 psf->sf_count[MCAST_EXCLUDE];
1535 case MLD2_ALLOW_NEW_SOURCES:
1536 if (gdeleted || !psf->sf_crcount)
1537 return false;
1538 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1539 case MLD2_BLOCK_OLD_SOURCES:
1540 if (pmc->mca_sfmode == MCAST_INCLUDE)
1541 return gdeleted || (psf->sf_crcount && sdeleted);
1542 return psf->sf_crcount && !gdeleted && !sdeleted;
1543 }
1544 return false;
1545 }
1546
1547 static int
1548 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1549 {
1550 struct ip6_sf_list *psf;
1551 int scount = 0;
1552
1553 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1554 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1555 continue;
1556 scount++;
1557 }
1558 return scount;
1559 }
1560
1561 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1562 struct net_device *dev,
1563 const struct in6_addr *saddr,
1564 const struct in6_addr *daddr,
1565 int proto, int len)
1566 {
1567 struct ipv6hdr *hdr;
1568
1569 skb->protocol = htons(ETH_P_IPV6);
1570 skb->dev = dev;
1571
1572 skb_reset_network_header(skb);
1573 skb_put(skb, sizeof(struct ipv6hdr));
1574 hdr = ipv6_hdr(skb);
1575
1576 ip6_flow_hdr(hdr, 0, 0);
1577
1578 hdr->payload_len = htons(len);
1579 hdr->nexthdr = proto;
1580 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1581
1582 hdr->saddr = *saddr;
1583 hdr->daddr = *daddr;
1584 }
1585
1586 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1587 {
1588 struct net_device *dev = idev->dev;
1589 struct net *net = dev_net(dev);
1590 struct sock *sk = net->ipv6.igmp_sk;
1591 struct sk_buff *skb;
1592 struct mld2_report *pmr;
1593 struct in6_addr addr_buf;
1594 const struct in6_addr *saddr;
1595 int hlen = LL_RESERVED_SPACE(dev);
1596 int tlen = dev->needed_tailroom;
1597 unsigned int size = mtu + hlen + tlen;
1598 int err;
1599 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1600 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1601 IPV6_TLV_PADN, 0 };
1602
1603 /* we assume size > sizeof(ra) here */
1604 /* limit our allocations to order-0 page */
1605 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1606 skb = sock_alloc_send_skb(sk, size, 1, &err);
1607
1608 if (!skb)
1609 return NULL;
1610
1611 skb->priority = TC_PRIO_CONTROL;
1612 skb_reserve(skb, hlen);
1613 skb_tailroom_reserve(skb, mtu, tlen);
1614
1615 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1616 /* <draft-ietf-magma-mld-source-05.txt>:
1617 * use unspecified address as the source address
1618 * when a valid link-local address is not available.
1619 */
1620 saddr = &in6addr_any;
1621 } else
1622 saddr = &addr_buf;
1623
1624 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1625
1626 skb_put_data(skb, ra, sizeof(ra));
1627
1628 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1629 skb_put(skb, sizeof(*pmr));
1630 pmr = (struct mld2_report *)skb_transport_header(skb);
1631 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1632 pmr->mld2r_resv1 = 0;
1633 pmr->mld2r_cksum = 0;
1634 pmr->mld2r_resv2 = 0;
1635 pmr->mld2r_ngrec = 0;
1636 return skb;
1637 }
1638
1639 static void mld_sendpack(struct sk_buff *skb)
1640 {
1641 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1642 struct mld2_report *pmr =
1643 (struct mld2_report *)skb_transport_header(skb);
1644 int payload_len, mldlen;
1645 struct inet6_dev *idev;
1646 struct net *net = dev_net(skb->dev);
1647 int err;
1648 struct flowi6 fl6;
1649 struct dst_entry *dst;
1650
1651 rcu_read_lock();
1652 idev = __in6_dev_get(skb->dev);
1653 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1654
1655 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1656 sizeof(*pip6);
1657 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1658 pip6->payload_len = htons(payload_len);
1659
1660 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1661 IPPROTO_ICMPV6,
1662 csum_partial(skb_transport_header(skb),
1663 mldlen, 0));
1664
1665 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1666 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1667 skb->dev->ifindex);
1668 dst = icmp6_dst_alloc(skb->dev, &fl6);
1669
1670 err = 0;
1671 if (IS_ERR(dst)) {
1672 err = PTR_ERR(dst);
1673 dst = NULL;
1674 }
1675 skb_dst_set(skb, dst);
1676 if (err)
1677 goto err_out;
1678
1679 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1680 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1681 dst_output);
1682 out:
1683 if (!err) {
1684 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1685 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1686 } else {
1687 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1688 }
1689
1690 rcu_read_unlock();
1691 return;
1692
1693 err_out:
1694 kfree_skb(skb);
1695 goto out;
1696 }
1697
1698 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1699 {
1700 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1701 }
1702
1703 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1704 int type, struct mld2_grec **ppgr, unsigned int mtu)
1705 {
1706 struct mld2_report *pmr;
1707 struct mld2_grec *pgr;
1708
1709 if (!skb) {
1710 skb = mld_newpack(pmc->idev, mtu);
1711 if (!skb)
1712 return NULL;
1713 }
1714 pgr = skb_put(skb, sizeof(struct mld2_grec));
1715 pgr->grec_type = type;
1716 pgr->grec_auxwords = 0;
1717 pgr->grec_nsrcs = 0;
1718 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1719 pmr = (struct mld2_report *)skb_transport_header(skb);
1720 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1721 *ppgr = pgr;
1722 return skb;
1723 }
1724
1725 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1726
1727 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1728 int type, int gdeleted, int sdeleted, int crsend)
1729 {
1730 struct inet6_dev *idev = pmc->idev;
1731 struct net_device *dev = idev->dev;
1732 struct mld2_report *pmr;
1733 struct mld2_grec *pgr = NULL;
1734 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1735 int scount, stotal, first, isquery, truncate;
1736 unsigned int mtu;
1737
1738 if (pmc->mca_flags & MAF_NOREPORT)
1739 return skb;
1740
1741 mtu = READ_ONCE(dev->mtu);
1742 if (mtu < IPV6_MIN_MTU)
1743 return skb;
1744
1745 isquery = type == MLD2_MODE_IS_INCLUDE ||
1746 type == MLD2_MODE_IS_EXCLUDE;
1747 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1748 type == MLD2_CHANGE_TO_EXCLUDE;
1749
1750 stotal = scount = 0;
1751
1752 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1753
1754 if (!*psf_list)
1755 goto empty_source;
1756
1757 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1758
1759 /* EX and TO_EX get a fresh packet, if needed */
1760 if (truncate) {
1761 if (pmr && pmr->mld2r_ngrec &&
1762 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1763 if (skb)
1764 mld_sendpack(skb);
1765 skb = mld_newpack(idev, mtu);
1766 }
1767 }
1768 first = 1;
1769 psf_prev = NULL;
1770 for (psf = *psf_list; psf; psf = psf_next) {
1771 struct in6_addr *psrc;
1772
1773 psf_next = psf->sf_next;
1774
1775 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1776 psf_prev = psf;
1777 continue;
1778 }
1779
1780 /* Based on RFC3810 6.1. Should not send source-list change
1781 * records when there is a filter mode change.
1782 */
1783 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1784 (!gdeleted && pmc->mca_crcount)) &&
1785 (type == MLD2_ALLOW_NEW_SOURCES ||
1786 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1787 goto decrease_sf_crcount;
1788
1789 /* clear marks on query responses */
1790 if (isquery)
1791 psf->sf_gsresp = 0;
1792
1793 if (AVAILABLE(skb) < sizeof(*psrc) +
1794 first*sizeof(struct mld2_grec)) {
1795 if (truncate && !first)
1796 break; /* truncate these */
1797 if (pgr)
1798 pgr->grec_nsrcs = htons(scount);
1799 if (skb)
1800 mld_sendpack(skb);
1801 skb = mld_newpack(idev, mtu);
1802 first = 1;
1803 scount = 0;
1804 }
1805 if (first) {
1806 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1807 first = 0;
1808 }
1809 if (!skb)
1810 return NULL;
1811 psrc = skb_put(skb, sizeof(*psrc));
1812 *psrc = psf->sf_addr;
1813 scount++; stotal++;
1814 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1815 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1816 decrease_sf_crcount:
1817 psf->sf_crcount--;
1818 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1819 if (psf_prev)
1820 psf_prev->sf_next = psf->sf_next;
1821 else
1822 *psf_list = psf->sf_next;
1823 kfree(psf);
1824 continue;
1825 }
1826 }
1827 psf_prev = psf;
1828 }
1829
1830 empty_source:
1831 if (!stotal) {
1832 if (type == MLD2_ALLOW_NEW_SOURCES ||
1833 type == MLD2_BLOCK_OLD_SOURCES)
1834 return skb;
1835 if (pmc->mca_crcount || isquery || crsend) {
1836 /* make sure we have room for group header */
1837 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1838 mld_sendpack(skb);
1839 skb = NULL; /* add_grhead will get a new one */
1840 }
1841 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1842 }
1843 }
1844 if (pgr)
1845 pgr->grec_nsrcs = htons(scount);
1846
1847 if (isquery)
1848 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1849 return skb;
1850 }
1851
1852 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1853 {
1854 struct sk_buff *skb = NULL;
1855 int type;
1856
1857 read_lock_bh(&idev->lock);
1858 if (!pmc) {
1859 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1860 if (pmc->mca_flags & MAF_NOREPORT)
1861 continue;
1862 spin_lock_bh(&pmc->mca_lock);
1863 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1864 type = MLD2_MODE_IS_EXCLUDE;
1865 else
1866 type = MLD2_MODE_IS_INCLUDE;
1867 skb = add_grec(skb, pmc, type, 0, 0, 0);
1868 spin_unlock_bh(&pmc->mca_lock);
1869 }
1870 } else {
1871 spin_lock_bh(&pmc->mca_lock);
1872 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1873 type = MLD2_MODE_IS_EXCLUDE;
1874 else
1875 type = MLD2_MODE_IS_INCLUDE;
1876 skb = add_grec(skb, pmc, type, 0, 0, 0);
1877 spin_unlock_bh(&pmc->mca_lock);
1878 }
1879 read_unlock_bh(&idev->lock);
1880 if (skb)
1881 mld_sendpack(skb);
1882 }
1883
1884 /*
1885 * remove zero-count source records from a source filter list
1886 */
1887 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1888 {
1889 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1890
1891 psf_prev = NULL;
1892 for (psf = *ppsf; psf; psf = psf_next) {
1893 psf_next = psf->sf_next;
1894 if (psf->sf_crcount == 0) {
1895 if (psf_prev)
1896 psf_prev->sf_next = psf->sf_next;
1897 else
1898 *ppsf = psf->sf_next;
1899 kfree(psf);
1900 } else
1901 psf_prev = psf;
1902 }
1903 }
1904
1905 static void mld_send_cr(struct inet6_dev *idev)
1906 {
1907 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1908 struct sk_buff *skb = NULL;
1909 int type, dtype;
1910
1911 read_lock_bh(&idev->lock);
1912 spin_lock(&idev->mc_lock);
1913
1914 /* deleted MCA's */
1915 pmc_prev = NULL;
1916 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1917 pmc_next = pmc->next;
1918 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1919 type = MLD2_BLOCK_OLD_SOURCES;
1920 dtype = MLD2_BLOCK_OLD_SOURCES;
1921 skb = add_grec(skb, pmc, type, 1, 0, 0);
1922 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1923 }
1924 if (pmc->mca_crcount) {
1925 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1926 type = MLD2_CHANGE_TO_INCLUDE;
1927 skb = add_grec(skb, pmc, type, 1, 0, 0);
1928 }
1929 pmc->mca_crcount--;
1930 if (pmc->mca_crcount == 0) {
1931 mld_clear_zeros(&pmc->mca_tomb);
1932 mld_clear_zeros(&pmc->mca_sources);
1933 }
1934 }
1935 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1936 !pmc->mca_sources) {
1937 if (pmc_prev)
1938 pmc_prev->next = pmc_next;
1939 else
1940 idev->mc_tomb = pmc_next;
1941 in6_dev_put(pmc->idev);
1942 kfree(pmc);
1943 } else
1944 pmc_prev = pmc;
1945 }
1946 spin_unlock(&idev->mc_lock);
1947
1948 /* change recs */
1949 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1950 spin_lock_bh(&pmc->mca_lock);
1951 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1952 type = MLD2_BLOCK_OLD_SOURCES;
1953 dtype = MLD2_ALLOW_NEW_SOURCES;
1954 } else {
1955 type = MLD2_ALLOW_NEW_SOURCES;
1956 dtype = MLD2_BLOCK_OLD_SOURCES;
1957 }
1958 skb = add_grec(skb, pmc, type, 0, 0, 0);
1959 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1960
1961 /* filter mode changes */
1962 if (pmc->mca_crcount) {
1963 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1964 type = MLD2_CHANGE_TO_EXCLUDE;
1965 else
1966 type = MLD2_CHANGE_TO_INCLUDE;
1967 skb = add_grec(skb, pmc, type, 0, 0, 0);
1968 pmc->mca_crcount--;
1969 }
1970 spin_unlock_bh(&pmc->mca_lock);
1971 }
1972 read_unlock_bh(&idev->lock);
1973 if (!skb)
1974 return;
1975 (void) mld_sendpack(skb);
1976 }
1977
1978 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1979 {
1980 struct net *net = dev_net(dev);
1981 struct sock *sk = net->ipv6.igmp_sk;
1982 struct inet6_dev *idev;
1983 struct sk_buff *skb;
1984 struct mld_msg *hdr;
1985 const struct in6_addr *snd_addr, *saddr;
1986 struct in6_addr addr_buf;
1987 int hlen = LL_RESERVED_SPACE(dev);
1988 int tlen = dev->needed_tailroom;
1989 int err, len, payload_len, full_len;
1990 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1991 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1992 IPV6_TLV_PADN, 0 };
1993 struct flowi6 fl6;
1994 struct dst_entry *dst;
1995
1996 if (type == ICMPV6_MGM_REDUCTION)
1997 snd_addr = &in6addr_linklocal_allrouters;
1998 else
1999 snd_addr = addr;
2000
2001 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2002 payload_len = len + sizeof(ra);
2003 full_len = sizeof(struct ipv6hdr) + payload_len;
2004
2005 rcu_read_lock();
2006 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2007 IPSTATS_MIB_OUT, full_len);
2008 rcu_read_unlock();
2009
2010 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2011
2012 if (!skb) {
2013 rcu_read_lock();
2014 IP6_INC_STATS(net, __in6_dev_get(dev),
2015 IPSTATS_MIB_OUTDISCARDS);
2016 rcu_read_unlock();
2017 return;
2018 }
2019 skb->priority = TC_PRIO_CONTROL;
2020 skb_reserve(skb, hlen);
2021
2022 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2023 /* <draft-ietf-magma-mld-source-05.txt>:
2024 * use unspecified address as the source address
2025 * when a valid link-local address is not available.
2026 */
2027 saddr = &in6addr_any;
2028 } else
2029 saddr = &addr_buf;
2030
2031 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2032
2033 skb_put_data(skb, ra, sizeof(ra));
2034
2035 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2036 hdr->mld_type = type;
2037 hdr->mld_mca = *addr;
2038
2039 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2040 IPPROTO_ICMPV6,
2041 csum_partial(hdr, len, 0));
2042
2043 rcu_read_lock();
2044 idev = __in6_dev_get(skb->dev);
2045
2046 icmpv6_flow_init(sk, &fl6, type,
2047 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2048 skb->dev->ifindex);
2049 dst = icmp6_dst_alloc(skb->dev, &fl6);
2050 if (IS_ERR(dst)) {
2051 err = PTR_ERR(dst);
2052 goto err_out;
2053 }
2054
2055 skb_dst_set(skb, dst);
2056 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2057 net, sk, skb, NULL, skb->dev,
2058 dst_output);
2059 out:
2060 if (!err) {
2061 ICMP6MSGOUT_INC_STATS(net, idev, type);
2062 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2063 } else
2064 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2065
2066 rcu_read_unlock();
2067 return;
2068
2069 err_out:
2070 kfree_skb(skb);
2071 goto out;
2072 }
2073
2074 static void mld_send_initial_cr(struct inet6_dev *idev)
2075 {
2076 struct sk_buff *skb;
2077 struct ifmcaddr6 *pmc;
2078 int type;
2079
2080 if (mld_in_v1_mode(idev))
2081 return;
2082
2083 skb = NULL;
2084 read_lock_bh(&idev->lock);
2085 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2086 spin_lock_bh(&pmc->mca_lock);
2087 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2088 type = MLD2_CHANGE_TO_EXCLUDE;
2089 else
2090 type = MLD2_ALLOW_NEW_SOURCES;
2091 skb = add_grec(skb, pmc, type, 0, 0, 1);
2092 spin_unlock_bh(&pmc->mca_lock);
2093 }
2094 read_unlock_bh(&idev->lock);
2095 if (skb)
2096 mld_sendpack(skb);
2097 }
2098
2099 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2100 {
2101 idev->mc_dad_count = idev->mc_qrv;
2102 if (idev->mc_dad_count) {
2103 mld_send_initial_cr(idev);
2104 idev->mc_dad_count--;
2105 if (idev->mc_dad_count)
2106 mld_dad_start_timer(idev,
2107 unsolicited_report_interval(idev));
2108 }
2109 }
2110
2111 static void mld_dad_timer_expire(struct timer_list *t)
2112 {
2113 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2114
2115 mld_send_initial_cr(idev);
2116 if (idev->mc_dad_count) {
2117 idev->mc_dad_count--;
2118 if (idev->mc_dad_count)
2119 mld_dad_start_timer(idev,
2120 unsolicited_report_interval(idev));
2121 }
2122 in6_dev_put(idev);
2123 }
2124
2125 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2126 const struct in6_addr *psfsrc)
2127 {
2128 struct ip6_sf_list *psf, *psf_prev;
2129 int rv = 0;
2130
2131 psf_prev = NULL;
2132 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2133 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2134 break;
2135 psf_prev = psf;
2136 }
2137 if (!psf || psf->sf_count[sfmode] == 0) {
2138 /* source filter not found, or count wrong => bug */
2139 return -ESRCH;
2140 }
2141 psf->sf_count[sfmode]--;
2142 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2143 struct inet6_dev *idev = pmc->idev;
2144
2145 /* no more filters for this source */
2146 if (psf_prev)
2147 psf_prev->sf_next = psf->sf_next;
2148 else
2149 pmc->mca_sources = psf->sf_next;
2150 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2151 !mld_in_v1_mode(idev)) {
2152 psf->sf_crcount = idev->mc_qrv;
2153 psf->sf_next = pmc->mca_tomb;
2154 pmc->mca_tomb = psf;
2155 rv = 1;
2156 } else
2157 kfree(psf);
2158 }
2159 return rv;
2160 }
2161
2162 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2163 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2164 int delta)
2165 {
2166 struct ifmcaddr6 *pmc;
2167 int changerec = 0;
2168 int i, err;
2169
2170 if (!idev)
2171 return -ENODEV;
2172 read_lock_bh(&idev->lock);
2173 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2174 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2175 break;
2176 }
2177 if (!pmc) {
2178 /* MCA not found?? bug */
2179 read_unlock_bh(&idev->lock);
2180 return -ESRCH;
2181 }
2182 spin_lock_bh(&pmc->mca_lock);
2183 sf_markstate(pmc);
2184 if (!delta) {
2185 if (!pmc->mca_sfcount[sfmode]) {
2186 spin_unlock_bh(&pmc->mca_lock);
2187 read_unlock_bh(&idev->lock);
2188 return -EINVAL;
2189 }
2190 pmc->mca_sfcount[sfmode]--;
2191 }
2192 err = 0;
2193 for (i = 0; i < sfcount; i++) {
2194 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2195
2196 changerec |= rv > 0;
2197 if (!err && rv < 0)
2198 err = rv;
2199 }
2200 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2201 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2202 pmc->mca_sfcount[MCAST_INCLUDE]) {
2203 struct ip6_sf_list *psf;
2204
2205 /* filter mode change */
2206 pmc->mca_sfmode = MCAST_INCLUDE;
2207 pmc->mca_crcount = idev->mc_qrv;
2208 idev->mc_ifc_count = pmc->mca_crcount;
2209 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2210 psf->sf_crcount = 0;
2211 mld_ifc_event(pmc->idev);
2212 } else if (sf_setstate(pmc) || changerec)
2213 mld_ifc_event(pmc->idev);
2214 spin_unlock_bh(&pmc->mca_lock);
2215 read_unlock_bh(&idev->lock);
2216 return err;
2217 }
2218
2219 /*
2220 * Add multicast single-source filter to the interface list
2221 */
2222 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2223 const struct in6_addr *psfsrc)
2224 {
2225 struct ip6_sf_list *psf, *psf_prev;
2226
2227 psf_prev = NULL;
2228 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2229 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2230 break;
2231 psf_prev = psf;
2232 }
2233 if (!psf) {
2234 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2235 if (!psf)
2236 return -ENOBUFS;
2237
2238 psf->sf_addr = *psfsrc;
2239 if (psf_prev) {
2240 psf_prev->sf_next = psf;
2241 } else
2242 pmc->mca_sources = psf;
2243 }
2244 psf->sf_count[sfmode]++;
2245 return 0;
2246 }
2247
2248 static void sf_markstate(struct ifmcaddr6 *pmc)
2249 {
2250 struct ip6_sf_list *psf;
2251 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2252
2253 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2254 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2255 psf->sf_oldin = mca_xcount ==
2256 psf->sf_count[MCAST_EXCLUDE] &&
2257 !psf->sf_count[MCAST_INCLUDE];
2258 } else
2259 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2260 }
2261
2262 static int sf_setstate(struct ifmcaddr6 *pmc)
2263 {
2264 struct ip6_sf_list *psf, *dpsf;
2265 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2266 int qrv = pmc->idev->mc_qrv;
2267 int new_in, rv;
2268
2269 rv = 0;
2270 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2271 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2272 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2273 !psf->sf_count[MCAST_INCLUDE];
2274 } else
2275 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2276 if (new_in) {
2277 if (!psf->sf_oldin) {
2278 struct ip6_sf_list *prev = NULL;
2279
2280 for (dpsf = pmc->mca_tomb; dpsf;
2281 dpsf = dpsf->sf_next) {
2282 if (ipv6_addr_equal(&dpsf->sf_addr,
2283 &psf->sf_addr))
2284 break;
2285 prev = dpsf;
2286 }
2287 if (dpsf) {
2288 if (prev)
2289 prev->sf_next = dpsf->sf_next;
2290 else
2291 pmc->mca_tomb = dpsf->sf_next;
2292 kfree(dpsf);
2293 }
2294 psf->sf_crcount = qrv;
2295 rv++;
2296 }
2297 } else if (psf->sf_oldin) {
2298 psf->sf_crcount = 0;
2299 /*
2300 * add or update "delete" records if an active filter
2301 * is now inactive
2302 */
2303 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2304 if (ipv6_addr_equal(&dpsf->sf_addr,
2305 &psf->sf_addr))
2306 break;
2307 if (!dpsf) {
2308 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2309 if (!dpsf)
2310 continue;
2311 *dpsf = *psf;
2312 /* pmc->mca_lock held by callers */
2313 dpsf->sf_next = pmc->mca_tomb;
2314 pmc->mca_tomb = dpsf;
2315 }
2316 dpsf->sf_crcount = qrv;
2317 rv++;
2318 }
2319 }
2320 return rv;
2321 }
2322
2323 /*
2324 * Add multicast source filter list to the interface list
2325 */
2326 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2327 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2328 int delta)
2329 {
2330 struct ifmcaddr6 *pmc;
2331 int isexclude;
2332 int i, err;
2333
2334 if (!idev)
2335 return -ENODEV;
2336 read_lock_bh(&idev->lock);
2337 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2338 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2339 break;
2340 }
2341 if (!pmc) {
2342 /* MCA not found?? bug */
2343 read_unlock_bh(&idev->lock);
2344 return -ESRCH;
2345 }
2346 spin_lock_bh(&pmc->mca_lock);
2347
2348 sf_markstate(pmc);
2349 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2350 if (!delta)
2351 pmc->mca_sfcount[sfmode]++;
2352 err = 0;
2353 for (i = 0; i < sfcount; i++) {
2354 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2355 if (err)
2356 break;
2357 }
2358 if (err) {
2359 int j;
2360
2361 if (!delta)
2362 pmc->mca_sfcount[sfmode]--;
2363 for (j = 0; j < i; j++)
2364 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2365 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2366 struct ip6_sf_list *psf;
2367
2368 /* filter mode change */
2369 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2370 pmc->mca_sfmode = MCAST_EXCLUDE;
2371 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2372 pmc->mca_sfmode = MCAST_INCLUDE;
2373 /* else no filters; keep old mode for reports */
2374
2375 pmc->mca_crcount = idev->mc_qrv;
2376 idev->mc_ifc_count = pmc->mca_crcount;
2377 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2378 psf->sf_crcount = 0;
2379 mld_ifc_event(idev);
2380 } else if (sf_setstate(pmc))
2381 mld_ifc_event(idev);
2382 spin_unlock_bh(&pmc->mca_lock);
2383 read_unlock_bh(&idev->lock);
2384 return err;
2385 }
2386
2387 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2388 {
2389 struct ip6_sf_list *psf, *nextpsf;
2390
2391 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2392 nextpsf = psf->sf_next;
2393 kfree(psf);
2394 }
2395 pmc->mca_tomb = NULL;
2396 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2397 nextpsf = psf->sf_next;
2398 kfree(psf);
2399 }
2400 pmc->mca_sources = NULL;
2401 pmc->mca_sfmode = MCAST_EXCLUDE;
2402 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2403 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2404 }
2405
2406
2407 static void igmp6_join_group(struct ifmcaddr6 *ma)
2408 {
2409 unsigned long delay;
2410
2411 if (ma->mca_flags & MAF_NOREPORT)
2412 return;
2413
2414 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2415
2416 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2417
2418 spin_lock_bh(&ma->mca_lock);
2419 if (del_timer(&ma->mca_timer)) {
2420 refcount_dec(&ma->mca_refcnt);
2421 delay = ma->mca_timer.expires - jiffies;
2422 }
2423
2424 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2425 refcount_inc(&ma->mca_refcnt);
2426 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2427 spin_unlock_bh(&ma->mca_lock);
2428 }
2429
2430 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2431 struct inet6_dev *idev)
2432 {
2433 int err;
2434
2435 write_lock_bh(&iml->sflock);
2436 if (!iml->sflist) {
2437 /* any-source empty exclude case */
2438 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2439 } else {
2440 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2441 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2442 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2443 iml->sflist = NULL;
2444 }
2445 write_unlock_bh(&iml->sflock);
2446 return err;
2447 }
2448
2449 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2450 {
2451 if (mld_in_v1_mode(ma->idev)) {
2452 if (ma->mca_flags & MAF_LAST_REPORTER)
2453 igmp6_send(&ma->mca_addr, ma->idev->dev,
2454 ICMPV6_MGM_REDUCTION);
2455 } else {
2456 mld_add_delrec(ma->idev, ma);
2457 mld_ifc_event(ma->idev);
2458 }
2459 }
2460
2461 static void mld_gq_timer_expire(struct timer_list *t)
2462 {
2463 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2464
2465 idev->mc_gq_running = 0;
2466 mld_send_report(idev, NULL);
2467 in6_dev_put(idev);
2468 }
2469
2470 static void mld_ifc_timer_expire(struct timer_list *t)
2471 {
2472 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2473
2474 mld_send_cr(idev);
2475 if (idev->mc_ifc_count) {
2476 idev->mc_ifc_count--;
2477 if (idev->mc_ifc_count)
2478 mld_ifc_start_timer(idev,
2479 unsolicited_report_interval(idev));
2480 }
2481 in6_dev_put(idev);
2482 }
2483
2484 static void mld_ifc_event(struct inet6_dev *idev)
2485 {
2486 if (mld_in_v1_mode(idev))
2487 return;
2488 idev->mc_ifc_count = idev->mc_qrv;
2489 mld_ifc_start_timer(idev, 1);
2490 }
2491
2492 static void igmp6_timer_handler(struct timer_list *t)
2493 {
2494 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2495
2496 if (mld_in_v1_mode(ma->idev))
2497 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2498 else
2499 mld_send_report(ma->idev, ma);
2500
2501 spin_lock(&ma->mca_lock);
2502 ma->mca_flags |= MAF_LAST_REPORTER;
2503 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2504 spin_unlock(&ma->mca_lock);
2505 ma_put(ma);
2506 }
2507
2508 /* Device changing type */
2509
2510 void ipv6_mc_unmap(struct inet6_dev *idev)
2511 {
2512 struct ifmcaddr6 *i;
2513
2514 /* Install multicast list, except for all-nodes (already installed) */
2515
2516 read_lock_bh(&idev->lock);
2517 for (i = idev->mc_list; i; i = i->next)
2518 igmp6_group_dropped(i);
2519 read_unlock_bh(&idev->lock);
2520 }
2521
2522 void ipv6_mc_remap(struct inet6_dev *idev)
2523 {
2524 ipv6_mc_up(idev);
2525 }
2526
2527 /* Device going down */
2528
2529 void ipv6_mc_down(struct inet6_dev *idev)
2530 {
2531 struct ifmcaddr6 *i;
2532
2533 /* Withdraw multicast list */
2534
2535 read_lock_bh(&idev->lock);
2536
2537 for (i = idev->mc_list; i; i = i->next)
2538 igmp6_group_dropped(i);
2539
2540 /* Should stop timer after group drop. or we will
2541 * start timer again in mld_ifc_event()
2542 */
2543 mld_ifc_stop_timer(idev);
2544 mld_gq_stop_timer(idev);
2545 mld_dad_stop_timer(idev);
2546 read_unlock_bh(&idev->lock);
2547 }
2548
2549 static void ipv6_mc_reset(struct inet6_dev *idev)
2550 {
2551 idev->mc_qrv = sysctl_mld_qrv;
2552 idev->mc_qi = MLD_QI_DEFAULT;
2553 idev->mc_qri = MLD_QRI_DEFAULT;
2554 idev->mc_v1_seen = 0;
2555 idev->mc_maxdelay = unsolicited_report_interval(idev);
2556 }
2557
2558 /* Device going up */
2559
2560 void ipv6_mc_up(struct inet6_dev *idev)
2561 {
2562 struct ifmcaddr6 *i;
2563
2564 /* Install multicast list, except for all-nodes (already installed) */
2565
2566 read_lock_bh(&idev->lock);
2567 ipv6_mc_reset(idev);
2568 for (i = idev->mc_list; i; i = i->next) {
2569 mld_del_delrec(idev, i);
2570 igmp6_group_added(i);
2571 }
2572 read_unlock_bh(&idev->lock);
2573 }
2574
2575 /* IPv6 device initialization. */
2576
2577 void ipv6_mc_init_dev(struct inet6_dev *idev)
2578 {
2579 write_lock_bh(&idev->lock);
2580 spin_lock_init(&idev->mc_lock);
2581 idev->mc_gq_running = 0;
2582 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2583 idev->mc_tomb = NULL;
2584 idev->mc_ifc_count = 0;
2585 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2586 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2587 ipv6_mc_reset(idev);
2588 write_unlock_bh(&idev->lock);
2589 }
2590
2591 /*
2592 * Device is about to be destroyed: clean up.
2593 */
2594
2595 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2596 {
2597 struct ifmcaddr6 *i;
2598
2599 /* Deactivate timers */
2600 ipv6_mc_down(idev);
2601 mld_clear_delrec(idev);
2602
2603 /* Delete all-nodes address. */
2604 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2605 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2606 * fail.
2607 */
2608 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2609
2610 if (idev->cnf.forwarding)
2611 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2612
2613 write_lock_bh(&idev->lock);
2614 while ((i = idev->mc_list) != NULL) {
2615 idev->mc_list = i->next;
2616
2617 write_unlock_bh(&idev->lock);
2618 ip6_mc_clear_src(i);
2619 ma_put(i);
2620 write_lock_bh(&idev->lock);
2621 }
2622 write_unlock_bh(&idev->lock);
2623 }
2624
2625 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2626 {
2627 struct ifmcaddr6 *pmc;
2628
2629 ASSERT_RTNL();
2630
2631 if (mld_in_v1_mode(idev)) {
2632 read_lock_bh(&idev->lock);
2633 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2634 igmp6_join_group(pmc);
2635 read_unlock_bh(&idev->lock);
2636 } else
2637 mld_send_report(idev, NULL);
2638 }
2639
2640 static int ipv6_mc_netdev_event(struct notifier_block *this,
2641 unsigned long event,
2642 void *ptr)
2643 {
2644 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2645 struct inet6_dev *idev = __in6_dev_get(dev);
2646
2647 switch (event) {
2648 case NETDEV_RESEND_IGMP:
2649 if (idev)
2650 ipv6_mc_rejoin_groups(idev);
2651 break;
2652 default:
2653 break;
2654 }
2655
2656 return NOTIFY_DONE;
2657 }
2658
2659 static struct notifier_block igmp6_netdev_notifier = {
2660 .notifier_call = ipv6_mc_netdev_event,
2661 };
2662
2663 #ifdef CONFIG_PROC_FS
2664 struct igmp6_mc_iter_state {
2665 struct seq_net_private p;
2666 struct net_device *dev;
2667 struct inet6_dev *idev;
2668 };
2669
2670 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2671
2672 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2673 {
2674 struct ifmcaddr6 *im = NULL;
2675 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2676 struct net *net = seq_file_net(seq);
2677
2678 state->idev = NULL;
2679 for_each_netdev_rcu(net, state->dev) {
2680 struct inet6_dev *idev;
2681 idev = __in6_dev_get(state->dev);
2682 if (!idev)
2683 continue;
2684 read_lock_bh(&idev->lock);
2685 im = idev->mc_list;
2686 if (im) {
2687 state->idev = idev;
2688 break;
2689 }
2690 read_unlock_bh(&idev->lock);
2691 }
2692 return im;
2693 }
2694
2695 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2696 {
2697 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2698
2699 im = im->next;
2700 while (!im) {
2701 if (likely(state->idev))
2702 read_unlock_bh(&state->idev->lock);
2703
2704 state->dev = next_net_device_rcu(state->dev);
2705 if (!state->dev) {
2706 state->idev = NULL;
2707 break;
2708 }
2709 state->idev = __in6_dev_get(state->dev);
2710 if (!state->idev)
2711 continue;
2712 read_lock_bh(&state->idev->lock);
2713 im = state->idev->mc_list;
2714 }
2715 return im;
2716 }
2717
2718 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2719 {
2720 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2721 if (im)
2722 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2723 --pos;
2724 return pos ? NULL : im;
2725 }
2726
2727 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2728 __acquires(RCU)
2729 {
2730 rcu_read_lock();
2731 return igmp6_mc_get_idx(seq, *pos);
2732 }
2733
2734 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2735 {
2736 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2737
2738 ++*pos;
2739 return im;
2740 }
2741
2742 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2743 __releases(RCU)
2744 {
2745 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2746
2747 if (likely(state->idev)) {
2748 read_unlock_bh(&state->idev->lock);
2749 state->idev = NULL;
2750 }
2751 state->dev = NULL;
2752 rcu_read_unlock();
2753 }
2754
2755 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2756 {
2757 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2758 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2759
2760 seq_printf(seq,
2761 "%-4d %-15s %pi6 %5d %08X %ld\n",
2762 state->dev->ifindex, state->dev->name,
2763 &im->mca_addr,
2764 im->mca_users, im->mca_flags,
2765 (im->mca_flags&MAF_TIMER_RUNNING) ?
2766 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2767 return 0;
2768 }
2769
2770 static const struct seq_operations igmp6_mc_seq_ops = {
2771 .start = igmp6_mc_seq_start,
2772 .next = igmp6_mc_seq_next,
2773 .stop = igmp6_mc_seq_stop,
2774 .show = igmp6_mc_seq_show,
2775 };
2776
2777 struct igmp6_mcf_iter_state {
2778 struct seq_net_private p;
2779 struct net_device *dev;
2780 struct inet6_dev *idev;
2781 struct ifmcaddr6 *im;
2782 };
2783
2784 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2785
2786 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2787 {
2788 struct ip6_sf_list *psf = NULL;
2789 struct ifmcaddr6 *im = NULL;
2790 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2791 struct net *net = seq_file_net(seq);
2792
2793 state->idev = NULL;
2794 state->im = NULL;
2795 for_each_netdev_rcu(net, state->dev) {
2796 struct inet6_dev *idev;
2797 idev = __in6_dev_get(state->dev);
2798 if (unlikely(idev == NULL))
2799 continue;
2800 read_lock_bh(&idev->lock);
2801 im = idev->mc_list;
2802 if (likely(im)) {
2803 spin_lock_bh(&im->mca_lock);
2804 psf = im->mca_sources;
2805 if (likely(psf)) {
2806 state->im = im;
2807 state->idev = idev;
2808 break;
2809 }
2810 spin_unlock_bh(&im->mca_lock);
2811 }
2812 read_unlock_bh(&idev->lock);
2813 }
2814 return psf;
2815 }
2816
2817 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2818 {
2819 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2820
2821 psf = psf->sf_next;
2822 while (!psf) {
2823 spin_unlock_bh(&state->im->mca_lock);
2824 state->im = state->im->next;
2825 while (!state->im) {
2826 if (likely(state->idev))
2827 read_unlock_bh(&state->idev->lock);
2828
2829 state->dev = next_net_device_rcu(state->dev);
2830 if (!state->dev) {
2831 state->idev = NULL;
2832 goto out;
2833 }
2834 state->idev = __in6_dev_get(state->dev);
2835 if (!state->idev)
2836 continue;
2837 read_lock_bh(&state->idev->lock);
2838 state->im = state->idev->mc_list;
2839 }
2840 if (!state->im)
2841 break;
2842 spin_lock_bh(&state->im->mca_lock);
2843 psf = state->im->mca_sources;
2844 }
2845 out:
2846 return psf;
2847 }
2848
2849 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2850 {
2851 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2852 if (psf)
2853 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2854 --pos;
2855 return pos ? NULL : psf;
2856 }
2857
2858 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2859 __acquires(RCU)
2860 {
2861 rcu_read_lock();
2862 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2863 }
2864
2865 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2866 {
2867 struct ip6_sf_list *psf;
2868 if (v == SEQ_START_TOKEN)
2869 psf = igmp6_mcf_get_first(seq);
2870 else
2871 psf = igmp6_mcf_get_next(seq, v);
2872 ++*pos;
2873 return psf;
2874 }
2875
2876 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2877 __releases(RCU)
2878 {
2879 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2880 if (likely(state->im)) {
2881 spin_unlock_bh(&state->im->mca_lock);
2882 state->im = NULL;
2883 }
2884 if (likely(state->idev)) {
2885 read_unlock_bh(&state->idev->lock);
2886 state->idev = NULL;
2887 }
2888 state->dev = NULL;
2889 rcu_read_unlock();
2890 }
2891
2892 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2893 {
2894 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2895 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2896
2897 if (v == SEQ_START_TOKEN) {
2898 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2899 } else {
2900 seq_printf(seq,
2901 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2902 state->dev->ifindex, state->dev->name,
2903 &state->im->mca_addr,
2904 &psf->sf_addr,
2905 psf->sf_count[MCAST_INCLUDE],
2906 psf->sf_count[MCAST_EXCLUDE]);
2907 }
2908 return 0;
2909 }
2910
2911 static const struct seq_operations igmp6_mcf_seq_ops = {
2912 .start = igmp6_mcf_seq_start,
2913 .next = igmp6_mcf_seq_next,
2914 .stop = igmp6_mcf_seq_stop,
2915 .show = igmp6_mcf_seq_show,
2916 };
2917
2918 static int __net_init igmp6_proc_init(struct net *net)
2919 {
2920 int err;
2921
2922 err = -ENOMEM;
2923 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
2924 sizeof(struct igmp6_mc_iter_state)))
2925 goto out;
2926 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
2927 &igmp6_mcf_seq_ops,
2928 sizeof(struct igmp6_mcf_iter_state)))
2929 goto out_proc_net_igmp6;
2930
2931 err = 0;
2932 out:
2933 return err;
2934
2935 out_proc_net_igmp6:
2936 remove_proc_entry("igmp6", net->proc_net);
2937 goto out;
2938 }
2939
2940 static void __net_exit igmp6_proc_exit(struct net *net)
2941 {
2942 remove_proc_entry("mcfilter6", net->proc_net);
2943 remove_proc_entry("igmp6", net->proc_net);
2944 }
2945 #else
2946 static inline int igmp6_proc_init(struct net *net)
2947 {
2948 return 0;
2949 }
2950 static inline void igmp6_proc_exit(struct net *net)
2951 {
2952 }
2953 #endif
2954
2955 static int __net_init igmp6_net_init(struct net *net)
2956 {
2957 int err;
2958
2959 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2960 SOCK_RAW, IPPROTO_ICMPV6, net);
2961 if (err < 0) {
2962 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2963 err);
2964 goto out;
2965 }
2966
2967 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2968
2969 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2970 SOCK_RAW, IPPROTO_ICMPV6, net);
2971 if (err < 0) {
2972 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2973 err);
2974 goto out_sock_create;
2975 }
2976
2977 err = igmp6_proc_init(net);
2978 if (err)
2979 goto out_sock_create_autojoin;
2980
2981 return 0;
2982
2983 out_sock_create_autojoin:
2984 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2985 out_sock_create:
2986 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2987 out:
2988 return err;
2989 }
2990
2991 static void __net_exit igmp6_net_exit(struct net *net)
2992 {
2993 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2994 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2995 igmp6_proc_exit(net);
2996 }
2997
2998 static struct pernet_operations igmp6_net_ops = {
2999 .init = igmp6_net_init,
3000 .exit = igmp6_net_exit,
3001 };
3002
3003 int __init igmp6_init(void)
3004 {
3005 return register_pernet_subsys(&igmp6_net_ops);
3006 }
3007
3008 int __init igmp6_late_init(void)
3009 {
3010 return register_netdevice_notifier(&igmp6_netdev_notifier);
3011 }
3012
3013 void igmp6_cleanup(void)
3014 {
3015 unregister_pernet_subsys(&igmp6_net_ops);
3016 }
3017
3018 void igmp6_late_cleanup(void)
3019 {
3020 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3021 }
Linux with added FPC-III support