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igmp v6: add __ipv6_sock_mc_join and __ipv6_sock_mc_drop
[deliverable/linux.git] / net / ipv6 / mcast.c
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <linux/pkt_sched.h>
48 #include <net/mld.h>
49
50 #include <linux/netfilter.h>
51 #include <linux/netfilter_ipv6.h>
52
53 #include <net/net_namespace.h>
54 #include <net/sock.h>
55 #include <net/snmp.h>
56
57 #include <net/ipv6.h>
58 #include <net/protocol.h>
59 #include <net/if_inet6.h>
60 #include <net/ndisc.h>
61 #include <net/addrconf.h>
62 #include <net/ip6_route.h>
63 #include <net/inet_common.h>
64
65 #include <net/ip6_checksum.h>
66
67 /* Ensure that we have struct in6_addr aligned on 32bit word. */
68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
72 };
73
74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
75
76 static void igmp6_join_group(struct ifmcaddr6 *ma);
77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
78 static void igmp6_timer_handler(unsigned long data);
79
80 static void mld_gq_timer_expire(unsigned long data);
81 static void mld_ifc_timer_expire(unsigned long data);
82 static void mld_ifc_event(struct inet6_dev *idev);
83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
84 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
85 static void mld_clear_delrec(struct inet6_dev *idev);
86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
87 static int sf_setstate(struct ifmcaddr6 *pmc);
88 static void sf_markstate(struct ifmcaddr6 *pmc);
89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
91 int sfmode, int sfcount, const struct in6_addr *psfsrc,
92 int delta);
93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
94 int sfmode, int sfcount, const struct in6_addr *psfsrc,
95 int delta);
96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
97 struct inet6_dev *idev);
98
99 #define MLD_QRV_DEFAULT 2
100 /* RFC3810, 9.2. Query Interval */
101 #define MLD_QI_DEFAULT (125 * HZ)
102 /* RFC3810, 9.3. Query Response Interval */
103 #define MLD_QRI_DEFAULT (10 * HZ)
104
105 /* RFC3810, 8.1 Query Version Distinctions */
106 #define MLD_V1_QUERY_LEN 24
107 #define MLD_V2_QUERY_LEN_MIN 28
108
109 #define IPV6_MLD_MAX_MSF 64
110
111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
113
114 /*
115 * socket join on multicast group
116 */
117
118 #define for_each_pmc_rcu(np, pmc) \
119 for (pmc = rcu_dereference(np->ipv6_mc_list); \
120 pmc != NULL; \
121 pmc = rcu_dereference(pmc->next))
122
123 static int unsolicited_report_interval(struct inet6_dev *idev)
124 {
125 int iv;
126
127 if (mld_in_v1_mode(idev))
128 iv = idev->cnf.mldv1_unsolicited_report_interval;
129 else
130 iv = idev->cnf.mldv2_unsolicited_report_interval;
131
132 return iv > 0 ? iv : 1;
133 }
134
135 int __ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
136 {
137 struct net_device *dev = NULL;
138 struct ipv6_mc_socklist *mc_lst;
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct net *net = sock_net(sk);
141 int err;
142
143 ASSERT_RTNL();
144
145 if (!ipv6_addr_is_multicast(addr))
146 return -EINVAL;
147
148 rcu_read_lock();
149 for_each_pmc_rcu(np, mc_lst) {
150 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
151 ipv6_addr_equal(&mc_lst->addr, addr)) {
152 rcu_read_unlock();
153 return -EADDRINUSE;
154 }
155 }
156 rcu_read_unlock();
157
158 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
159
160 if (mc_lst == NULL)
161 return -ENOMEM;
162
163 mc_lst->next = NULL;
164 mc_lst->addr = *addr;
165
166 if (ifindex == 0) {
167 struct rt6_info *rt;
168 rt = rt6_lookup(net, addr, NULL, 0, 0);
169 if (rt) {
170 dev = rt->dst.dev;
171 ip6_rt_put(rt);
172 }
173 } else
174 dev = __dev_get_by_index(net, ifindex);
175
176 if (dev == NULL) {
177 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
178 return -ENODEV;
179 }
180
181 mc_lst->ifindex = dev->ifindex;
182 mc_lst->sfmode = MCAST_EXCLUDE;
183 rwlock_init(&mc_lst->sflock);
184 mc_lst->sflist = NULL;
185
186 /*
187 * now add/increase the group membership on the device
188 */
189
190 err = ipv6_dev_mc_inc(dev, addr);
191
192 if (err) {
193 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
194 return err;
195 }
196
197 mc_lst->next = np->ipv6_mc_list;
198 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
199
200 return 0;
201 }
202 EXPORT_SYMBOL(__ipv6_sock_mc_join);
203
204 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
205 {
206 int ret;
207
208 rtnl_lock();
209 ret = __ipv6_sock_mc_join(sk, ifindex, addr);
210 rtnl_unlock();
211
212 return ret;
213 }
214 EXPORT_SYMBOL(ipv6_sock_mc_join);
215
216 /*
217 * socket leave on multicast group
218 */
219 int __ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
220 {
221 struct ipv6_pinfo *np = inet6_sk(sk);
222 struct ipv6_mc_socklist *mc_lst;
223 struct ipv6_mc_socklist __rcu **lnk;
224 struct net *net = sock_net(sk);
225
226 ASSERT_RTNL();
227
228 if (!ipv6_addr_is_multicast(addr))
229 return -EINVAL;
230
231 for (lnk = &np->ipv6_mc_list;
232 (mc_lst = rtnl_dereference(*lnk)) != NULL;
233 lnk = &mc_lst->next) {
234 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
235 ipv6_addr_equal(&mc_lst->addr, addr)) {
236 struct net_device *dev;
237
238 *lnk = mc_lst->next;
239
240 dev = __dev_get_by_index(net, mc_lst->ifindex);
241 if (dev != NULL) {
242 struct inet6_dev *idev = __in6_dev_get(dev);
243
244 (void) ip6_mc_leave_src(sk, mc_lst, idev);
245 if (idev)
246 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
247 } else
248 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
249
250 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
251 kfree_rcu(mc_lst, rcu);
252 return 0;
253 }
254 }
255
256 return -EADDRNOTAVAIL;
257 }
258 EXPORT_SYMBOL(__ipv6_sock_mc_drop);
259
260 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
261 {
262 int ret;
263
264 rtnl_lock();
265 ret = __ipv6_sock_mc_drop(sk, ifindex, addr);
266 rtnl_unlock();
267
268 return ret;
269 }
270 EXPORT_SYMBOL(ipv6_sock_mc_drop);
271
272 /* called with rcu_read_lock() */
273 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
274 const struct in6_addr *group,
275 int ifindex)
276 {
277 struct net_device *dev = NULL;
278 struct inet6_dev *idev = NULL;
279
280 if (ifindex == 0) {
281 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
282
283 if (rt) {
284 dev = rt->dst.dev;
285 ip6_rt_put(rt);
286 }
287 } else
288 dev = dev_get_by_index_rcu(net, ifindex);
289
290 if (!dev)
291 return NULL;
292 idev = __in6_dev_get(dev);
293 if (!idev)
294 return NULL;
295 read_lock_bh(&idev->lock);
296 if (idev->dead) {
297 read_unlock_bh(&idev->lock);
298 return NULL;
299 }
300 return idev;
301 }
302
303 void ipv6_sock_mc_close(struct sock *sk)
304 {
305 struct ipv6_pinfo *np = inet6_sk(sk);
306 struct ipv6_mc_socklist *mc_lst;
307 struct net *net = sock_net(sk);
308
309 if (!rcu_access_pointer(np->ipv6_mc_list))
310 return;
311
312 rtnl_lock();
313 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
314 struct net_device *dev;
315
316 np->ipv6_mc_list = mc_lst->next;
317
318 dev = __dev_get_by_index(net, mc_lst->ifindex);
319 if (dev) {
320 struct inet6_dev *idev = __in6_dev_get(dev);
321
322 (void) ip6_mc_leave_src(sk, mc_lst, idev);
323 if (idev)
324 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
325 } else
326 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
327
328 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
329 kfree_rcu(mc_lst, rcu);
330
331 }
332 rtnl_unlock();
333 }
334
335 int ip6_mc_source(int add, int omode, struct sock *sk,
336 struct group_source_req *pgsr)
337 {
338 struct in6_addr *source, *group;
339 struct ipv6_mc_socklist *pmc;
340 struct inet6_dev *idev;
341 struct ipv6_pinfo *inet6 = inet6_sk(sk);
342 struct ip6_sf_socklist *psl;
343 struct net *net = sock_net(sk);
344 int i, j, rv;
345 int leavegroup = 0;
346 int pmclocked = 0;
347 int err;
348
349 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
350 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
351
352 if (!ipv6_addr_is_multicast(group))
353 return -EINVAL;
354
355 rcu_read_lock();
356 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
357 if (!idev) {
358 rcu_read_unlock();
359 return -ENODEV;
360 }
361
362 err = -EADDRNOTAVAIL;
363
364 for_each_pmc_rcu(inet6, pmc) {
365 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
366 continue;
367 if (ipv6_addr_equal(&pmc->addr, group))
368 break;
369 }
370 if (!pmc) { /* must have a prior join */
371 err = -EINVAL;
372 goto done;
373 }
374 /* if a source filter was set, must be the same mode as before */
375 if (pmc->sflist) {
376 if (pmc->sfmode != omode) {
377 err = -EINVAL;
378 goto done;
379 }
380 } else if (pmc->sfmode != omode) {
381 /* allow mode switches for empty-set filters */
382 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
383 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
384 pmc->sfmode = omode;
385 }
386
387 write_lock(&pmc->sflock);
388 pmclocked = 1;
389
390 psl = pmc->sflist;
391 if (!add) {
392 if (!psl)
393 goto done; /* err = -EADDRNOTAVAIL */
394 rv = !0;
395 for (i = 0; i < psl->sl_count; i++) {
396 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
397 if (rv == 0)
398 break;
399 }
400 if (rv) /* source not found */
401 goto done; /* err = -EADDRNOTAVAIL */
402
403 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
404 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
405 leavegroup = 1;
406 goto done;
407 }
408
409 /* update the interface filter */
410 ip6_mc_del_src(idev, group, omode, 1, source, 1);
411
412 for (j = i+1; j < psl->sl_count; j++)
413 psl->sl_addr[j-1] = psl->sl_addr[j];
414 psl->sl_count--;
415 err = 0;
416 goto done;
417 }
418 /* else, add a new source to the filter */
419
420 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
421 err = -ENOBUFS;
422 goto done;
423 }
424 if (!psl || psl->sl_count == psl->sl_max) {
425 struct ip6_sf_socklist *newpsl;
426 int count = IP6_SFBLOCK;
427
428 if (psl)
429 count += psl->sl_max;
430 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
431 if (!newpsl) {
432 err = -ENOBUFS;
433 goto done;
434 }
435 newpsl->sl_max = count;
436 newpsl->sl_count = count - IP6_SFBLOCK;
437 if (psl) {
438 for (i = 0; i < psl->sl_count; i++)
439 newpsl->sl_addr[i] = psl->sl_addr[i];
440 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
441 }
442 pmc->sflist = psl = newpsl;
443 }
444 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
445 for (i = 0; i < psl->sl_count; i++) {
446 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
447 if (rv == 0) /* There is an error in the address. */
448 goto done;
449 }
450 for (j = psl->sl_count-1; j >= i; j--)
451 psl->sl_addr[j+1] = psl->sl_addr[j];
452 psl->sl_addr[i] = *source;
453 psl->sl_count++;
454 err = 0;
455 /* update the interface list */
456 ip6_mc_add_src(idev, group, omode, 1, source, 1);
457 done:
458 if (pmclocked)
459 write_unlock(&pmc->sflock);
460 read_unlock_bh(&idev->lock);
461 rcu_read_unlock();
462 if (leavegroup)
463 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
464 return err;
465 }
466
467 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
468 {
469 const struct in6_addr *group;
470 struct ipv6_mc_socklist *pmc;
471 struct inet6_dev *idev;
472 struct ipv6_pinfo *inet6 = inet6_sk(sk);
473 struct ip6_sf_socklist *newpsl, *psl;
474 struct net *net = sock_net(sk);
475 int leavegroup = 0;
476 int i, err;
477
478 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
479
480 if (!ipv6_addr_is_multicast(group))
481 return -EINVAL;
482 if (gsf->gf_fmode != MCAST_INCLUDE &&
483 gsf->gf_fmode != MCAST_EXCLUDE)
484 return -EINVAL;
485
486 rcu_read_lock();
487 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
488
489 if (!idev) {
490 rcu_read_unlock();
491 return -ENODEV;
492 }
493
494 err = 0;
495
496 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
497 leavegroup = 1;
498 goto done;
499 }
500
501 for_each_pmc_rcu(inet6, pmc) {
502 if (pmc->ifindex != gsf->gf_interface)
503 continue;
504 if (ipv6_addr_equal(&pmc->addr, group))
505 break;
506 }
507 if (!pmc) { /* must have a prior join */
508 err = -EINVAL;
509 goto done;
510 }
511 if (gsf->gf_numsrc) {
512 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
513 GFP_ATOMIC);
514 if (!newpsl) {
515 err = -ENOBUFS;
516 goto done;
517 }
518 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
519 for (i = 0; i < newpsl->sl_count; ++i) {
520 struct sockaddr_in6 *psin6;
521
522 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
523 newpsl->sl_addr[i] = psin6->sin6_addr;
524 }
525 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
526 newpsl->sl_count, newpsl->sl_addr, 0);
527 if (err) {
528 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
529 goto done;
530 }
531 } else {
532 newpsl = NULL;
533 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
534 }
535
536 write_lock(&pmc->sflock);
537 psl = pmc->sflist;
538 if (psl) {
539 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
540 psl->sl_count, psl->sl_addr, 0);
541 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
542 } else
543 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
544 pmc->sflist = newpsl;
545 pmc->sfmode = gsf->gf_fmode;
546 write_unlock(&pmc->sflock);
547 err = 0;
548 done:
549 read_unlock_bh(&idev->lock);
550 rcu_read_unlock();
551 if (leavegroup)
552 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
553 return err;
554 }
555
556 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
557 struct group_filter __user *optval, int __user *optlen)
558 {
559 int err, i, count, copycount;
560 const struct in6_addr *group;
561 struct ipv6_mc_socklist *pmc;
562 struct inet6_dev *idev;
563 struct ipv6_pinfo *inet6 = inet6_sk(sk);
564 struct ip6_sf_socklist *psl;
565 struct net *net = sock_net(sk);
566
567 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
568
569 if (!ipv6_addr_is_multicast(group))
570 return -EINVAL;
571
572 rcu_read_lock();
573 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
574
575 if (!idev) {
576 rcu_read_unlock();
577 return -ENODEV;
578 }
579
580 err = -EADDRNOTAVAIL;
581 /* changes to the ipv6_mc_list require the socket lock and
582 * rtnl lock. We have the socket lock and rcu read lock,
583 * so reading the list is safe.
584 */
585
586 for_each_pmc_rcu(inet6, pmc) {
587 if (pmc->ifindex != gsf->gf_interface)
588 continue;
589 if (ipv6_addr_equal(group, &pmc->addr))
590 break;
591 }
592 if (!pmc) /* must have a prior join */
593 goto done;
594 gsf->gf_fmode = pmc->sfmode;
595 psl = pmc->sflist;
596 count = psl ? psl->sl_count : 0;
597 read_unlock_bh(&idev->lock);
598 rcu_read_unlock();
599
600 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
601 gsf->gf_numsrc = count;
602 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
603 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
604 return -EFAULT;
605 }
606 /* changes to psl require the socket lock, and a write lock
607 * on pmc->sflock. We have the socket lock so reading here is safe.
608 */
609 for (i = 0; i < copycount; i++) {
610 struct sockaddr_in6 *psin6;
611 struct sockaddr_storage ss;
612
613 psin6 = (struct sockaddr_in6 *)&ss;
614 memset(&ss, 0, sizeof(ss));
615 psin6->sin6_family = AF_INET6;
616 psin6->sin6_addr = psl->sl_addr[i];
617 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
618 return -EFAULT;
619 }
620 return 0;
621 done:
622 read_unlock_bh(&idev->lock);
623 rcu_read_unlock();
624 return err;
625 }
626
627 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
628 const struct in6_addr *src_addr)
629 {
630 struct ipv6_pinfo *np = inet6_sk(sk);
631 struct ipv6_mc_socklist *mc;
632 struct ip6_sf_socklist *psl;
633 bool rv = true;
634
635 rcu_read_lock();
636 for_each_pmc_rcu(np, mc) {
637 if (ipv6_addr_equal(&mc->addr, mc_addr))
638 break;
639 }
640 if (!mc) {
641 rcu_read_unlock();
642 return true;
643 }
644 read_lock(&mc->sflock);
645 psl = mc->sflist;
646 if (!psl) {
647 rv = mc->sfmode == MCAST_EXCLUDE;
648 } else {
649 int i;
650
651 for (i = 0; i < psl->sl_count; i++) {
652 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
653 break;
654 }
655 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
656 rv = false;
657 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
658 rv = false;
659 }
660 read_unlock(&mc->sflock);
661 rcu_read_unlock();
662
663 return rv;
664 }
665
666 static void igmp6_group_added(struct ifmcaddr6 *mc)
667 {
668 struct net_device *dev = mc->idev->dev;
669 char buf[MAX_ADDR_LEN];
670
671 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
672 IPV6_ADDR_SCOPE_LINKLOCAL)
673 return;
674
675 spin_lock_bh(&mc->mca_lock);
676 if (!(mc->mca_flags&MAF_LOADED)) {
677 mc->mca_flags |= MAF_LOADED;
678 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
679 dev_mc_add(dev, buf);
680 }
681 spin_unlock_bh(&mc->mca_lock);
682
683 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
684 return;
685
686 if (mld_in_v1_mode(mc->idev)) {
687 igmp6_join_group(mc);
688 return;
689 }
690 /* else v2 */
691
692 mc->mca_crcount = mc->idev->mc_qrv;
693 mld_ifc_event(mc->idev);
694 }
695
696 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
697 {
698 struct net_device *dev = mc->idev->dev;
699 char buf[MAX_ADDR_LEN];
700
701 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
702 IPV6_ADDR_SCOPE_LINKLOCAL)
703 return;
704
705 spin_lock_bh(&mc->mca_lock);
706 if (mc->mca_flags&MAF_LOADED) {
707 mc->mca_flags &= ~MAF_LOADED;
708 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
709 dev_mc_del(dev, buf);
710 }
711
712 if (mc->mca_flags & MAF_NOREPORT)
713 goto done;
714 spin_unlock_bh(&mc->mca_lock);
715
716 if (!mc->idev->dead)
717 igmp6_leave_group(mc);
718
719 spin_lock_bh(&mc->mca_lock);
720 if (del_timer(&mc->mca_timer))
721 atomic_dec(&mc->mca_refcnt);
722 done:
723 ip6_mc_clear_src(mc);
724 spin_unlock_bh(&mc->mca_lock);
725 }
726
727 /*
728 * deleted ifmcaddr6 manipulation
729 */
730 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
731 {
732 struct ifmcaddr6 *pmc;
733
734 /* this is an "ifmcaddr6" for convenience; only the fields below
735 * are actually used. In particular, the refcnt and users are not
736 * used for management of the delete list. Using the same structure
737 * for deleted items allows change reports to use common code with
738 * non-deleted or query-response MCA's.
739 */
740 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
741 if (!pmc)
742 return;
743
744 spin_lock_bh(&im->mca_lock);
745 spin_lock_init(&pmc->mca_lock);
746 pmc->idev = im->idev;
747 in6_dev_hold(idev);
748 pmc->mca_addr = im->mca_addr;
749 pmc->mca_crcount = idev->mc_qrv;
750 pmc->mca_sfmode = im->mca_sfmode;
751 if (pmc->mca_sfmode == MCAST_INCLUDE) {
752 struct ip6_sf_list *psf;
753
754 pmc->mca_tomb = im->mca_tomb;
755 pmc->mca_sources = im->mca_sources;
756 im->mca_tomb = im->mca_sources = NULL;
757 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
758 psf->sf_crcount = pmc->mca_crcount;
759 }
760 spin_unlock_bh(&im->mca_lock);
761
762 spin_lock_bh(&idev->mc_lock);
763 pmc->next = idev->mc_tomb;
764 idev->mc_tomb = pmc;
765 spin_unlock_bh(&idev->mc_lock);
766 }
767
768 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
769 {
770 struct ifmcaddr6 *pmc, *pmc_prev;
771 struct ip6_sf_list *psf, *psf_next;
772
773 spin_lock_bh(&idev->mc_lock);
774 pmc_prev = NULL;
775 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
776 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
777 break;
778 pmc_prev = pmc;
779 }
780 if (pmc) {
781 if (pmc_prev)
782 pmc_prev->next = pmc->next;
783 else
784 idev->mc_tomb = pmc->next;
785 }
786 spin_unlock_bh(&idev->mc_lock);
787
788 if (pmc) {
789 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
790 psf_next = psf->sf_next;
791 kfree(psf);
792 }
793 in6_dev_put(pmc->idev);
794 kfree(pmc);
795 }
796 }
797
798 static void mld_clear_delrec(struct inet6_dev *idev)
799 {
800 struct ifmcaddr6 *pmc, *nextpmc;
801
802 spin_lock_bh(&idev->mc_lock);
803 pmc = idev->mc_tomb;
804 idev->mc_tomb = NULL;
805 spin_unlock_bh(&idev->mc_lock);
806
807 for (; pmc; pmc = nextpmc) {
808 nextpmc = pmc->next;
809 ip6_mc_clear_src(pmc);
810 in6_dev_put(pmc->idev);
811 kfree(pmc);
812 }
813
814 /* clear dead sources, too */
815 read_lock_bh(&idev->lock);
816 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
817 struct ip6_sf_list *psf, *psf_next;
818
819 spin_lock_bh(&pmc->mca_lock);
820 psf = pmc->mca_tomb;
821 pmc->mca_tomb = NULL;
822 spin_unlock_bh(&pmc->mca_lock);
823 for (; psf; psf = psf_next) {
824 psf_next = psf->sf_next;
825 kfree(psf);
826 }
827 }
828 read_unlock_bh(&idev->lock);
829 }
830
831 static void mca_get(struct ifmcaddr6 *mc)
832 {
833 atomic_inc(&mc->mca_refcnt);
834 }
835
836 static void ma_put(struct ifmcaddr6 *mc)
837 {
838 if (atomic_dec_and_test(&mc->mca_refcnt)) {
839 in6_dev_put(mc->idev);
840 kfree(mc);
841 }
842 }
843
844 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
845 const struct in6_addr *addr)
846 {
847 struct ifmcaddr6 *mc;
848
849 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
850 if (mc == NULL)
851 return NULL;
852
853 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
854
855 mc->mca_addr = *addr;
856 mc->idev = idev; /* reference taken by caller */
857 mc->mca_users = 1;
858 /* mca_stamp should be updated upon changes */
859 mc->mca_cstamp = mc->mca_tstamp = jiffies;
860 atomic_set(&mc->mca_refcnt, 1);
861 spin_lock_init(&mc->mca_lock);
862
863 /* initial mode is (EX, empty) */
864 mc->mca_sfmode = MCAST_EXCLUDE;
865 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
866
867 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
868 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
869 mc->mca_flags |= MAF_NOREPORT;
870
871 return mc;
872 }
873
874 /*
875 * device multicast group inc (add if not found)
876 */
877 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
878 {
879 struct ifmcaddr6 *mc;
880 struct inet6_dev *idev;
881
882 ASSERT_RTNL();
883
884 /* we need to take a reference on idev */
885 idev = in6_dev_get(dev);
886
887 if (idev == NULL)
888 return -EINVAL;
889
890 write_lock_bh(&idev->lock);
891 if (idev->dead) {
892 write_unlock_bh(&idev->lock);
893 in6_dev_put(idev);
894 return -ENODEV;
895 }
896
897 for (mc = idev->mc_list; mc; mc = mc->next) {
898 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
899 mc->mca_users++;
900 write_unlock_bh(&idev->lock);
901 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
902 NULL, 0);
903 in6_dev_put(idev);
904 return 0;
905 }
906 }
907
908 mc = mca_alloc(idev, addr);
909 if (!mc) {
910 write_unlock_bh(&idev->lock);
911 in6_dev_put(idev);
912 return -ENOMEM;
913 }
914
915 mc->next = idev->mc_list;
916 idev->mc_list = mc;
917
918 /* Hold this for the code below before we unlock,
919 * it is already exposed via idev->mc_list.
920 */
921 mca_get(mc);
922 write_unlock_bh(&idev->lock);
923
924 mld_del_delrec(idev, &mc->mca_addr);
925 igmp6_group_added(mc);
926 ma_put(mc);
927 return 0;
928 }
929
930 /*
931 * device multicast group del
932 */
933 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
934 {
935 struct ifmcaddr6 *ma, **map;
936
937 ASSERT_RTNL();
938
939 write_lock_bh(&idev->lock);
940 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
941 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
942 if (--ma->mca_users == 0) {
943 *map = ma->next;
944 write_unlock_bh(&idev->lock);
945
946 igmp6_group_dropped(ma);
947
948 ma_put(ma);
949 return 0;
950 }
951 write_unlock_bh(&idev->lock);
952 return 0;
953 }
954 }
955 write_unlock_bh(&idev->lock);
956
957 return -ENOENT;
958 }
959
960 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
961 {
962 struct inet6_dev *idev;
963 int err;
964
965 ASSERT_RTNL();
966
967 idev = __in6_dev_get(dev);
968 if (!idev)
969 err = -ENODEV;
970 else
971 err = __ipv6_dev_mc_dec(idev, addr);
972
973 return err;
974 }
975
976 /*
977 * check if the interface/address pair is valid
978 */
979 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
980 const struct in6_addr *src_addr)
981 {
982 struct inet6_dev *idev;
983 struct ifmcaddr6 *mc;
984 bool rv = false;
985
986 rcu_read_lock();
987 idev = __in6_dev_get(dev);
988 if (idev) {
989 read_lock_bh(&idev->lock);
990 for (mc = idev->mc_list; mc; mc = mc->next) {
991 if (ipv6_addr_equal(&mc->mca_addr, group))
992 break;
993 }
994 if (mc) {
995 if (src_addr && !ipv6_addr_any(src_addr)) {
996 struct ip6_sf_list *psf;
997
998 spin_lock_bh(&mc->mca_lock);
999 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1000 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1001 break;
1002 }
1003 if (psf)
1004 rv = psf->sf_count[MCAST_INCLUDE] ||
1005 psf->sf_count[MCAST_EXCLUDE] !=
1006 mc->mca_sfcount[MCAST_EXCLUDE];
1007 else
1008 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1009 spin_unlock_bh(&mc->mca_lock);
1010 } else
1011 rv = true; /* don't filter unspecified source */
1012 }
1013 read_unlock_bh(&idev->lock);
1014 }
1015 rcu_read_unlock();
1016 return rv;
1017 }
1018
1019 static void mld_gq_start_timer(struct inet6_dev *idev)
1020 {
1021 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1022
1023 idev->mc_gq_running = 1;
1024 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1025 in6_dev_hold(idev);
1026 }
1027
1028 static void mld_gq_stop_timer(struct inet6_dev *idev)
1029 {
1030 idev->mc_gq_running = 0;
1031 if (del_timer(&idev->mc_gq_timer))
1032 __in6_dev_put(idev);
1033 }
1034
1035 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1036 {
1037 unsigned long tv = prandom_u32() % delay;
1038
1039 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1040 in6_dev_hold(idev);
1041 }
1042
1043 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1044 {
1045 idev->mc_ifc_count = 0;
1046 if (del_timer(&idev->mc_ifc_timer))
1047 __in6_dev_put(idev);
1048 }
1049
1050 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1051 {
1052 unsigned long tv = prandom_u32() % delay;
1053
1054 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1055 in6_dev_hold(idev);
1056 }
1057
1058 static void mld_dad_stop_timer(struct inet6_dev *idev)
1059 {
1060 if (del_timer(&idev->mc_dad_timer))
1061 __in6_dev_put(idev);
1062 }
1063
1064 /*
1065 * IGMP handling (alias multicast ICMPv6 messages)
1066 */
1067
1068 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1069 {
1070 unsigned long delay = resptime;
1071
1072 /* Do not start timer for these addresses */
1073 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1074 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1075 return;
1076
1077 if (del_timer(&ma->mca_timer)) {
1078 atomic_dec(&ma->mca_refcnt);
1079 delay = ma->mca_timer.expires - jiffies;
1080 }
1081
1082 if (delay >= resptime)
1083 delay = prandom_u32() % resptime;
1084
1085 ma->mca_timer.expires = jiffies + delay;
1086 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1087 atomic_inc(&ma->mca_refcnt);
1088 ma->mca_flags |= MAF_TIMER_RUNNING;
1089 }
1090
1091 /* mark EXCLUDE-mode sources */
1092 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1093 const struct in6_addr *srcs)
1094 {
1095 struct ip6_sf_list *psf;
1096 int i, scount;
1097
1098 scount = 0;
1099 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1100 if (scount == nsrcs)
1101 break;
1102 for (i = 0; i < nsrcs; i++) {
1103 /* skip inactive filters */
1104 if (psf->sf_count[MCAST_INCLUDE] ||
1105 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1106 psf->sf_count[MCAST_EXCLUDE])
1107 break;
1108 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1109 scount++;
1110 break;
1111 }
1112 }
1113 }
1114 pmc->mca_flags &= ~MAF_GSQUERY;
1115 if (scount == nsrcs) /* all sources excluded */
1116 return false;
1117 return true;
1118 }
1119
1120 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1121 const struct in6_addr *srcs)
1122 {
1123 struct ip6_sf_list *psf;
1124 int i, scount;
1125
1126 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1127 return mld_xmarksources(pmc, nsrcs, srcs);
1128
1129 /* mark INCLUDE-mode sources */
1130
1131 scount = 0;
1132 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1133 if (scount == nsrcs)
1134 break;
1135 for (i = 0; i < nsrcs; i++) {
1136 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1137 psf->sf_gsresp = 1;
1138 scount++;
1139 break;
1140 }
1141 }
1142 }
1143 if (!scount) {
1144 pmc->mca_flags &= ~MAF_GSQUERY;
1145 return false;
1146 }
1147 pmc->mca_flags |= MAF_GSQUERY;
1148 return true;
1149 }
1150
1151 static int mld_force_mld_version(const struct inet6_dev *idev)
1152 {
1153 /* Normally, both are 0 here. If enforcement to a particular is
1154 * being used, individual device enforcement will have a lower
1155 * precedence over 'all' device (.../conf/all/force_mld_version).
1156 */
1157
1158 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1159 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1160 else
1161 return idev->cnf.force_mld_version;
1162 }
1163
1164 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1165 {
1166 return mld_force_mld_version(idev) == 2;
1167 }
1168
1169 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1170 {
1171 return mld_force_mld_version(idev) == 1;
1172 }
1173
1174 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1175 {
1176 if (mld_in_v2_mode_only(idev))
1177 return false;
1178 if (mld_in_v1_mode_only(idev))
1179 return true;
1180 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1181 return true;
1182
1183 return false;
1184 }
1185
1186 static void mld_set_v1_mode(struct inet6_dev *idev)
1187 {
1188 /* RFC3810, relevant sections:
1189 * - 9.1. Robustness Variable
1190 * - 9.2. Query Interval
1191 * - 9.3. Query Response Interval
1192 * - 9.12. Older Version Querier Present Timeout
1193 */
1194 unsigned long switchback;
1195
1196 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1197
1198 idev->mc_v1_seen = jiffies + switchback;
1199 }
1200
1201 static void mld_update_qrv(struct inet6_dev *idev,
1202 const struct mld2_query *mlh2)
1203 {
1204 /* RFC3810, relevant sections:
1205 * - 5.1.8. QRV (Querier's Robustness Variable)
1206 * - 9.1. Robustness Variable
1207 */
1208
1209 /* The value of the Robustness Variable MUST NOT be zero,
1210 * and SHOULD NOT be one. Catch this here if we ever run
1211 * into such a case in future.
1212 */
1213 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1214 WARN_ON(idev->mc_qrv == 0);
1215
1216 if (mlh2->mld2q_qrv > 0)
1217 idev->mc_qrv = mlh2->mld2q_qrv;
1218
1219 if (unlikely(idev->mc_qrv < min_qrv)) {
1220 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1221 idev->mc_qrv, min_qrv);
1222 idev->mc_qrv = min_qrv;
1223 }
1224 }
1225
1226 static void mld_update_qi(struct inet6_dev *idev,
1227 const struct mld2_query *mlh2)
1228 {
1229 /* RFC3810, relevant sections:
1230 * - 5.1.9. QQIC (Querier's Query Interval Code)
1231 * - 9.2. Query Interval
1232 * - 9.12. Older Version Querier Present Timeout
1233 * (the [Query Interval] in the last Query received)
1234 */
1235 unsigned long mc_qqi;
1236
1237 if (mlh2->mld2q_qqic < 128) {
1238 mc_qqi = mlh2->mld2q_qqic;
1239 } else {
1240 unsigned long mc_man, mc_exp;
1241
1242 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1243 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1244
1245 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1246 }
1247
1248 idev->mc_qi = mc_qqi * HZ;
1249 }
1250
1251 static void mld_update_qri(struct inet6_dev *idev,
1252 const struct mld2_query *mlh2)
1253 {
1254 /* RFC3810, relevant sections:
1255 * - 5.1.3. Maximum Response Code
1256 * - 9.3. Query Response Interval
1257 */
1258 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1259 }
1260
1261 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1262 unsigned long *max_delay, bool v1_query)
1263 {
1264 unsigned long mldv1_md;
1265
1266 /* Ignore v1 queries */
1267 if (mld_in_v2_mode_only(idev))
1268 return -EINVAL;
1269
1270 mldv1_md = ntohs(mld->mld_maxdelay);
1271
1272 /* When in MLDv1 fallback and a MLDv2 router start-up being
1273 * unaware of current MLDv1 operation, the MRC == MRD mapping
1274 * only works when the exponential algorithm is not being
1275 * used (as MLDv1 is unaware of such things).
1276 *
1277 * According to the RFC author, the MLDv2 implementations
1278 * he's aware of all use a MRC < 32768 on start up queries.
1279 *
1280 * Thus, should we *ever* encounter something else larger
1281 * than that, just assume the maximum possible within our
1282 * reach.
1283 */
1284 if (!v1_query)
1285 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1286
1287 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1288
1289 /* MLDv1 router present: we need to go into v1 mode *only*
1290 * when an MLDv1 query is received as per section 9.12. of
1291 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1292 * queries MUST be of exactly 24 octets.
1293 */
1294 if (v1_query)
1295 mld_set_v1_mode(idev);
1296
1297 /* cancel MLDv2 report timer */
1298 mld_gq_stop_timer(idev);
1299 /* cancel the interface change timer */
1300 mld_ifc_stop_timer(idev);
1301 /* clear deleted report items */
1302 mld_clear_delrec(idev);
1303
1304 return 0;
1305 }
1306
1307 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1308 unsigned long *max_delay)
1309 {
1310 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1311
1312 mld_update_qrv(idev, mld);
1313 mld_update_qi(idev, mld);
1314 mld_update_qri(idev, mld);
1315
1316 idev->mc_maxdelay = *max_delay;
1317
1318 return 0;
1319 }
1320
1321 /* called with rcu_read_lock() */
1322 int igmp6_event_query(struct sk_buff *skb)
1323 {
1324 struct mld2_query *mlh2 = NULL;
1325 struct ifmcaddr6 *ma;
1326 const struct in6_addr *group;
1327 unsigned long max_delay;
1328 struct inet6_dev *idev;
1329 struct mld_msg *mld;
1330 int group_type;
1331 int mark = 0;
1332 int len, err;
1333
1334 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1335 return -EINVAL;
1336
1337 /* compute payload length excluding extension headers */
1338 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1339 len -= skb_network_header_len(skb);
1340
1341 /* RFC3810 6.2
1342 * Upon reception of an MLD message that contains a Query, the node
1343 * checks if the source address of the message is a valid link-local
1344 * address, if the Hop Limit is set to 1, and if the Router Alert
1345 * option is present in the Hop-By-Hop Options header of the IPv6
1346 * packet. If any of these checks fails, the packet is dropped.
1347 */
1348 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1349 ipv6_hdr(skb)->hop_limit != 1 ||
1350 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1351 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1352 return -EINVAL;
1353
1354 idev = __in6_dev_get(skb->dev);
1355 if (idev == NULL)
1356 return 0;
1357
1358 mld = (struct mld_msg *)icmp6_hdr(skb);
1359 group = &mld->mld_mca;
1360 group_type = ipv6_addr_type(group);
1361
1362 if (group_type != IPV6_ADDR_ANY &&
1363 !(group_type&IPV6_ADDR_MULTICAST))
1364 return -EINVAL;
1365
1366 if (len < MLD_V1_QUERY_LEN) {
1367 return -EINVAL;
1368 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1369 err = mld_process_v1(idev, mld, &max_delay,
1370 len == MLD_V1_QUERY_LEN);
1371 if (err < 0)
1372 return err;
1373 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1374 int srcs_offset = sizeof(struct mld2_query) -
1375 sizeof(struct icmp6hdr);
1376
1377 if (!pskb_may_pull(skb, srcs_offset))
1378 return -EINVAL;
1379
1380 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1381
1382 err = mld_process_v2(idev, mlh2, &max_delay);
1383 if (err < 0)
1384 return err;
1385
1386 if (group_type == IPV6_ADDR_ANY) { /* general query */
1387 if (mlh2->mld2q_nsrcs)
1388 return -EINVAL; /* no sources allowed */
1389
1390 mld_gq_start_timer(idev);
1391 return 0;
1392 }
1393 /* mark sources to include, if group & source-specific */
1394 if (mlh2->mld2q_nsrcs != 0) {
1395 if (!pskb_may_pull(skb, srcs_offset +
1396 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1397 return -EINVAL;
1398
1399 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1400 mark = 1;
1401 }
1402 } else {
1403 return -EINVAL;
1404 }
1405
1406 read_lock_bh(&idev->lock);
1407 if (group_type == IPV6_ADDR_ANY) {
1408 for (ma = idev->mc_list; ma; ma = ma->next) {
1409 spin_lock_bh(&ma->mca_lock);
1410 igmp6_group_queried(ma, max_delay);
1411 spin_unlock_bh(&ma->mca_lock);
1412 }
1413 } else {
1414 for (ma = idev->mc_list; ma; ma = ma->next) {
1415 if (!ipv6_addr_equal(group, &ma->mca_addr))
1416 continue;
1417 spin_lock_bh(&ma->mca_lock);
1418 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1419 /* gsquery <- gsquery && mark */
1420 if (!mark)
1421 ma->mca_flags &= ~MAF_GSQUERY;
1422 } else {
1423 /* gsquery <- mark */
1424 if (mark)
1425 ma->mca_flags |= MAF_GSQUERY;
1426 else
1427 ma->mca_flags &= ~MAF_GSQUERY;
1428 }
1429 if (!(ma->mca_flags & MAF_GSQUERY) ||
1430 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1431 igmp6_group_queried(ma, max_delay);
1432 spin_unlock_bh(&ma->mca_lock);
1433 break;
1434 }
1435 }
1436 read_unlock_bh(&idev->lock);
1437
1438 return 0;
1439 }
1440
1441 /* called with rcu_read_lock() */
1442 int igmp6_event_report(struct sk_buff *skb)
1443 {
1444 struct ifmcaddr6 *ma;
1445 struct inet6_dev *idev;
1446 struct mld_msg *mld;
1447 int addr_type;
1448
1449 /* Our own report looped back. Ignore it. */
1450 if (skb->pkt_type == PACKET_LOOPBACK)
1451 return 0;
1452
1453 /* send our report if the MC router may not have heard this report */
1454 if (skb->pkt_type != PACKET_MULTICAST &&
1455 skb->pkt_type != PACKET_BROADCAST)
1456 return 0;
1457
1458 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1459 return -EINVAL;
1460
1461 mld = (struct mld_msg *)icmp6_hdr(skb);
1462
1463 /* Drop reports with not link local source */
1464 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1465 if (addr_type != IPV6_ADDR_ANY &&
1466 !(addr_type&IPV6_ADDR_LINKLOCAL))
1467 return -EINVAL;
1468
1469 idev = __in6_dev_get(skb->dev);
1470 if (idev == NULL)
1471 return -ENODEV;
1472
1473 /*
1474 * Cancel the timer for this group
1475 */
1476
1477 read_lock_bh(&idev->lock);
1478 for (ma = idev->mc_list; ma; ma = ma->next) {
1479 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1480 spin_lock(&ma->mca_lock);
1481 if (del_timer(&ma->mca_timer))
1482 atomic_dec(&ma->mca_refcnt);
1483 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1484 spin_unlock(&ma->mca_lock);
1485 break;
1486 }
1487 }
1488 read_unlock_bh(&idev->lock);
1489 return 0;
1490 }
1491
1492 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1493 int gdeleted, int sdeleted)
1494 {
1495 switch (type) {
1496 case MLD2_MODE_IS_INCLUDE:
1497 case MLD2_MODE_IS_EXCLUDE:
1498 if (gdeleted || sdeleted)
1499 return false;
1500 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1501 if (pmc->mca_sfmode == MCAST_INCLUDE)
1502 return true;
1503 /* don't include if this source is excluded
1504 * in all filters
1505 */
1506 if (psf->sf_count[MCAST_INCLUDE])
1507 return type == MLD2_MODE_IS_INCLUDE;
1508 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1509 psf->sf_count[MCAST_EXCLUDE];
1510 }
1511 return false;
1512 case MLD2_CHANGE_TO_INCLUDE:
1513 if (gdeleted || sdeleted)
1514 return false;
1515 return psf->sf_count[MCAST_INCLUDE] != 0;
1516 case MLD2_CHANGE_TO_EXCLUDE:
1517 if (gdeleted || sdeleted)
1518 return false;
1519 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1520 psf->sf_count[MCAST_INCLUDE])
1521 return false;
1522 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1523 psf->sf_count[MCAST_EXCLUDE];
1524 case MLD2_ALLOW_NEW_SOURCES:
1525 if (gdeleted || !psf->sf_crcount)
1526 return false;
1527 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1528 case MLD2_BLOCK_OLD_SOURCES:
1529 if (pmc->mca_sfmode == MCAST_INCLUDE)
1530 return gdeleted || (psf->sf_crcount && sdeleted);
1531 return psf->sf_crcount && !gdeleted && !sdeleted;
1532 }
1533 return false;
1534 }
1535
1536 static int
1537 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1538 {
1539 struct ip6_sf_list *psf;
1540 int scount = 0;
1541
1542 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1543 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1544 continue;
1545 scount++;
1546 }
1547 return scount;
1548 }
1549
1550 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1551 struct net_device *dev,
1552 const struct in6_addr *saddr,
1553 const struct in6_addr *daddr,
1554 int proto, int len)
1555 {
1556 struct ipv6hdr *hdr;
1557
1558 skb->protocol = htons(ETH_P_IPV6);
1559 skb->dev = dev;
1560
1561 skb_reset_network_header(skb);
1562 skb_put(skb, sizeof(struct ipv6hdr));
1563 hdr = ipv6_hdr(skb);
1564
1565 ip6_flow_hdr(hdr, 0, 0);
1566
1567 hdr->payload_len = htons(len);
1568 hdr->nexthdr = proto;
1569 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1570
1571 hdr->saddr = *saddr;
1572 hdr->daddr = *daddr;
1573 }
1574
1575 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1576 {
1577 struct net_device *dev = idev->dev;
1578 struct net *net = dev_net(dev);
1579 struct sock *sk = net->ipv6.igmp_sk;
1580 struct sk_buff *skb;
1581 struct mld2_report *pmr;
1582 struct in6_addr addr_buf;
1583 const struct in6_addr *saddr;
1584 int hlen = LL_RESERVED_SPACE(dev);
1585 int tlen = dev->needed_tailroom;
1586 unsigned int size = mtu + hlen + tlen;
1587 int err;
1588 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1589 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1590 IPV6_TLV_PADN, 0 };
1591
1592 /* we assume size > sizeof(ra) here */
1593 /* limit our allocations to order-0 page */
1594 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1595 skb = sock_alloc_send_skb(sk, size, 1, &err);
1596
1597 if (!skb)
1598 return NULL;
1599
1600 skb->priority = TC_PRIO_CONTROL;
1601 skb->reserved_tailroom = skb_end_offset(skb) -
1602 min(mtu, skb_end_offset(skb));
1603 skb_reserve(skb, hlen);
1604
1605 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1606 /* <draft-ietf-magma-mld-source-05.txt>:
1607 * use unspecified address as the source address
1608 * when a valid link-local address is not available.
1609 */
1610 saddr = &in6addr_any;
1611 } else
1612 saddr = &addr_buf;
1613
1614 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1615
1616 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1617
1618 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1619 skb_put(skb, sizeof(*pmr));
1620 pmr = (struct mld2_report *)skb_transport_header(skb);
1621 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1622 pmr->mld2r_resv1 = 0;
1623 pmr->mld2r_cksum = 0;
1624 pmr->mld2r_resv2 = 0;
1625 pmr->mld2r_ngrec = 0;
1626 return skb;
1627 }
1628
1629 static void mld_sendpack(struct sk_buff *skb)
1630 {
1631 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1632 struct mld2_report *pmr =
1633 (struct mld2_report *)skb_transport_header(skb);
1634 int payload_len, mldlen;
1635 struct inet6_dev *idev;
1636 struct net *net = dev_net(skb->dev);
1637 int err;
1638 struct flowi6 fl6;
1639 struct dst_entry *dst;
1640
1641 rcu_read_lock();
1642 idev = __in6_dev_get(skb->dev);
1643 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1644
1645 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1646 sizeof(*pip6);
1647 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1648 pip6->payload_len = htons(payload_len);
1649
1650 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1651 IPPROTO_ICMPV6,
1652 csum_partial(skb_transport_header(skb),
1653 mldlen, 0));
1654
1655 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1656 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1657 skb->dev->ifindex);
1658 dst = icmp6_dst_alloc(skb->dev, &fl6);
1659
1660 err = 0;
1661 if (IS_ERR(dst)) {
1662 err = PTR_ERR(dst);
1663 dst = NULL;
1664 }
1665 skb_dst_set(skb, dst);
1666 if (err)
1667 goto err_out;
1668
1669 payload_len = skb->len;
1670
1671 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1672 dst_output);
1673 out:
1674 if (!err) {
1675 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1676 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1677 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1678 } else {
1679 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1680 }
1681
1682 rcu_read_unlock();
1683 return;
1684
1685 err_out:
1686 kfree_skb(skb);
1687 goto out;
1688 }
1689
1690 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1691 {
1692 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1693 }
1694
1695 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1696 int type, struct mld2_grec **ppgr)
1697 {
1698 struct net_device *dev = pmc->idev->dev;
1699 struct mld2_report *pmr;
1700 struct mld2_grec *pgr;
1701
1702 if (!skb)
1703 skb = mld_newpack(pmc->idev, dev->mtu);
1704 if (!skb)
1705 return NULL;
1706 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1707 pgr->grec_type = type;
1708 pgr->grec_auxwords = 0;
1709 pgr->grec_nsrcs = 0;
1710 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1711 pmr = (struct mld2_report *)skb_transport_header(skb);
1712 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1713 *ppgr = pgr;
1714 return skb;
1715 }
1716
1717 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1718
1719 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1720 int type, int gdeleted, int sdeleted, int crsend)
1721 {
1722 struct inet6_dev *idev = pmc->idev;
1723 struct net_device *dev = idev->dev;
1724 struct mld2_report *pmr;
1725 struct mld2_grec *pgr = NULL;
1726 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1727 int scount, stotal, first, isquery, truncate;
1728
1729 if (pmc->mca_flags & MAF_NOREPORT)
1730 return skb;
1731
1732 isquery = type == MLD2_MODE_IS_INCLUDE ||
1733 type == MLD2_MODE_IS_EXCLUDE;
1734 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1735 type == MLD2_CHANGE_TO_EXCLUDE;
1736
1737 stotal = scount = 0;
1738
1739 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1740
1741 if (!*psf_list)
1742 goto empty_source;
1743
1744 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1745
1746 /* EX and TO_EX get a fresh packet, if needed */
1747 if (truncate) {
1748 if (pmr && pmr->mld2r_ngrec &&
1749 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1750 if (skb)
1751 mld_sendpack(skb);
1752 skb = mld_newpack(idev, dev->mtu);
1753 }
1754 }
1755 first = 1;
1756 psf_prev = NULL;
1757 for (psf = *psf_list; psf; psf = psf_next) {
1758 struct in6_addr *psrc;
1759
1760 psf_next = psf->sf_next;
1761
1762 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1763 psf_prev = psf;
1764 continue;
1765 }
1766
1767 /* clear marks on query responses */
1768 if (isquery)
1769 psf->sf_gsresp = 0;
1770
1771 if (AVAILABLE(skb) < sizeof(*psrc) +
1772 first*sizeof(struct mld2_grec)) {
1773 if (truncate && !first)
1774 break; /* truncate these */
1775 if (pgr)
1776 pgr->grec_nsrcs = htons(scount);
1777 if (skb)
1778 mld_sendpack(skb);
1779 skb = mld_newpack(idev, dev->mtu);
1780 first = 1;
1781 scount = 0;
1782 }
1783 if (first) {
1784 skb = add_grhead(skb, pmc, type, &pgr);
1785 first = 0;
1786 }
1787 if (!skb)
1788 return NULL;
1789 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1790 *psrc = psf->sf_addr;
1791 scount++; stotal++;
1792 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1793 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1794 psf->sf_crcount--;
1795 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1796 if (psf_prev)
1797 psf_prev->sf_next = psf->sf_next;
1798 else
1799 *psf_list = psf->sf_next;
1800 kfree(psf);
1801 continue;
1802 }
1803 }
1804 psf_prev = psf;
1805 }
1806
1807 empty_source:
1808 if (!stotal) {
1809 if (type == MLD2_ALLOW_NEW_SOURCES ||
1810 type == MLD2_BLOCK_OLD_SOURCES)
1811 return skb;
1812 if (pmc->mca_crcount || isquery || crsend) {
1813 /* make sure we have room for group header */
1814 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1815 mld_sendpack(skb);
1816 skb = NULL; /* add_grhead will get a new one */
1817 }
1818 skb = add_grhead(skb, pmc, type, &pgr);
1819 }
1820 }
1821 if (pgr)
1822 pgr->grec_nsrcs = htons(scount);
1823
1824 if (isquery)
1825 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1826 return skb;
1827 }
1828
1829 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1830 {
1831 struct sk_buff *skb = NULL;
1832 int type;
1833
1834 read_lock_bh(&idev->lock);
1835 if (!pmc) {
1836 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1837 if (pmc->mca_flags & MAF_NOREPORT)
1838 continue;
1839 spin_lock_bh(&pmc->mca_lock);
1840 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1841 type = MLD2_MODE_IS_EXCLUDE;
1842 else
1843 type = MLD2_MODE_IS_INCLUDE;
1844 skb = add_grec(skb, pmc, type, 0, 0, 0);
1845 spin_unlock_bh(&pmc->mca_lock);
1846 }
1847 } else {
1848 spin_lock_bh(&pmc->mca_lock);
1849 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1850 type = MLD2_MODE_IS_EXCLUDE;
1851 else
1852 type = MLD2_MODE_IS_INCLUDE;
1853 skb = add_grec(skb, pmc, type, 0, 0, 0);
1854 spin_unlock_bh(&pmc->mca_lock);
1855 }
1856 read_unlock_bh(&idev->lock);
1857 if (skb)
1858 mld_sendpack(skb);
1859 }
1860
1861 /*
1862 * remove zero-count source records from a source filter list
1863 */
1864 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1865 {
1866 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1867
1868 psf_prev = NULL;
1869 for (psf = *ppsf; psf; psf = psf_next) {
1870 psf_next = psf->sf_next;
1871 if (psf->sf_crcount == 0) {
1872 if (psf_prev)
1873 psf_prev->sf_next = psf->sf_next;
1874 else
1875 *ppsf = psf->sf_next;
1876 kfree(psf);
1877 } else
1878 psf_prev = psf;
1879 }
1880 }
1881
1882 static void mld_send_cr(struct inet6_dev *idev)
1883 {
1884 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1885 struct sk_buff *skb = NULL;
1886 int type, dtype;
1887
1888 read_lock_bh(&idev->lock);
1889 spin_lock(&idev->mc_lock);
1890
1891 /* deleted MCA's */
1892 pmc_prev = NULL;
1893 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1894 pmc_next = pmc->next;
1895 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1896 type = MLD2_BLOCK_OLD_SOURCES;
1897 dtype = MLD2_BLOCK_OLD_SOURCES;
1898 skb = add_grec(skb, pmc, type, 1, 0, 0);
1899 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1900 }
1901 if (pmc->mca_crcount) {
1902 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1903 type = MLD2_CHANGE_TO_INCLUDE;
1904 skb = add_grec(skb, pmc, type, 1, 0, 0);
1905 }
1906 pmc->mca_crcount--;
1907 if (pmc->mca_crcount == 0) {
1908 mld_clear_zeros(&pmc->mca_tomb);
1909 mld_clear_zeros(&pmc->mca_sources);
1910 }
1911 }
1912 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1913 !pmc->mca_sources) {
1914 if (pmc_prev)
1915 pmc_prev->next = pmc_next;
1916 else
1917 idev->mc_tomb = pmc_next;
1918 in6_dev_put(pmc->idev);
1919 kfree(pmc);
1920 } else
1921 pmc_prev = pmc;
1922 }
1923 spin_unlock(&idev->mc_lock);
1924
1925 /* change recs */
1926 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1927 spin_lock_bh(&pmc->mca_lock);
1928 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1929 type = MLD2_BLOCK_OLD_SOURCES;
1930 dtype = MLD2_ALLOW_NEW_SOURCES;
1931 } else {
1932 type = MLD2_ALLOW_NEW_SOURCES;
1933 dtype = MLD2_BLOCK_OLD_SOURCES;
1934 }
1935 skb = add_grec(skb, pmc, type, 0, 0, 0);
1936 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1937
1938 /* filter mode changes */
1939 if (pmc->mca_crcount) {
1940 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1941 type = MLD2_CHANGE_TO_EXCLUDE;
1942 else
1943 type = MLD2_CHANGE_TO_INCLUDE;
1944 skb = add_grec(skb, pmc, type, 0, 0, 0);
1945 pmc->mca_crcount--;
1946 }
1947 spin_unlock_bh(&pmc->mca_lock);
1948 }
1949 read_unlock_bh(&idev->lock);
1950 if (!skb)
1951 return;
1952 (void) mld_sendpack(skb);
1953 }
1954
1955 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1956 {
1957 struct net *net = dev_net(dev);
1958 struct sock *sk = net->ipv6.igmp_sk;
1959 struct inet6_dev *idev;
1960 struct sk_buff *skb;
1961 struct mld_msg *hdr;
1962 const struct in6_addr *snd_addr, *saddr;
1963 struct in6_addr addr_buf;
1964 int hlen = LL_RESERVED_SPACE(dev);
1965 int tlen = dev->needed_tailroom;
1966 int err, len, payload_len, full_len;
1967 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1968 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1969 IPV6_TLV_PADN, 0 };
1970 struct flowi6 fl6;
1971 struct dst_entry *dst;
1972
1973 if (type == ICMPV6_MGM_REDUCTION)
1974 snd_addr = &in6addr_linklocal_allrouters;
1975 else
1976 snd_addr = addr;
1977
1978 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1979 payload_len = len + sizeof(ra);
1980 full_len = sizeof(struct ipv6hdr) + payload_len;
1981
1982 rcu_read_lock();
1983 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1984 IPSTATS_MIB_OUT, full_len);
1985 rcu_read_unlock();
1986
1987 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1988
1989 if (skb == NULL) {
1990 rcu_read_lock();
1991 IP6_INC_STATS(net, __in6_dev_get(dev),
1992 IPSTATS_MIB_OUTDISCARDS);
1993 rcu_read_unlock();
1994 return;
1995 }
1996 skb->priority = TC_PRIO_CONTROL;
1997 skb_reserve(skb, hlen);
1998
1999 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2000 /* <draft-ietf-magma-mld-source-05.txt>:
2001 * use unspecified address as the source address
2002 * when a valid link-local address is not available.
2003 */
2004 saddr = &in6addr_any;
2005 } else
2006 saddr = &addr_buf;
2007
2008 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2009
2010 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
2011
2012 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
2013 memset(hdr, 0, sizeof(struct mld_msg));
2014 hdr->mld_type = type;
2015 hdr->mld_mca = *addr;
2016
2017 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2018 IPPROTO_ICMPV6,
2019 csum_partial(hdr, len, 0));
2020
2021 rcu_read_lock();
2022 idev = __in6_dev_get(skb->dev);
2023
2024 icmpv6_flow_init(sk, &fl6, type,
2025 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2026 skb->dev->ifindex);
2027 dst = icmp6_dst_alloc(skb->dev, &fl6);
2028 if (IS_ERR(dst)) {
2029 err = PTR_ERR(dst);
2030 goto err_out;
2031 }
2032
2033 skb_dst_set(skb, dst);
2034 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
2035 dst_output);
2036 out:
2037 if (!err) {
2038 ICMP6MSGOUT_INC_STATS(net, idev, type);
2039 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2040 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2041 } else
2042 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2043
2044 rcu_read_unlock();
2045 return;
2046
2047 err_out:
2048 kfree_skb(skb);
2049 goto out;
2050 }
2051
2052 static void mld_send_initial_cr(struct inet6_dev *idev)
2053 {
2054 struct sk_buff *skb;
2055 struct ifmcaddr6 *pmc;
2056 int type;
2057
2058 if (mld_in_v1_mode(idev))
2059 return;
2060
2061 skb = NULL;
2062 read_lock_bh(&idev->lock);
2063 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2064 spin_lock_bh(&pmc->mca_lock);
2065 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2066 type = MLD2_CHANGE_TO_EXCLUDE;
2067 else
2068 type = MLD2_CHANGE_TO_INCLUDE;
2069 skb = add_grec(skb, pmc, type, 0, 0, 1);
2070 spin_unlock_bh(&pmc->mca_lock);
2071 }
2072 read_unlock_bh(&idev->lock);
2073 if (skb)
2074 mld_sendpack(skb);
2075 }
2076
2077 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2078 {
2079 idev->mc_dad_count = idev->mc_qrv;
2080 if (idev->mc_dad_count) {
2081 mld_send_initial_cr(idev);
2082 idev->mc_dad_count--;
2083 if (idev->mc_dad_count)
2084 mld_dad_start_timer(idev, idev->mc_maxdelay);
2085 }
2086 }
2087
2088 static void mld_dad_timer_expire(unsigned long data)
2089 {
2090 struct inet6_dev *idev = (struct inet6_dev *)data;
2091
2092 mld_send_initial_cr(idev);
2093 if (idev->mc_dad_count) {
2094 idev->mc_dad_count--;
2095 if (idev->mc_dad_count)
2096 mld_dad_start_timer(idev, idev->mc_maxdelay);
2097 }
2098 in6_dev_put(idev);
2099 }
2100
2101 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2102 const struct in6_addr *psfsrc)
2103 {
2104 struct ip6_sf_list *psf, *psf_prev;
2105 int rv = 0;
2106
2107 psf_prev = NULL;
2108 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2109 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2110 break;
2111 psf_prev = psf;
2112 }
2113 if (!psf || psf->sf_count[sfmode] == 0) {
2114 /* source filter not found, or count wrong => bug */
2115 return -ESRCH;
2116 }
2117 psf->sf_count[sfmode]--;
2118 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2119 struct inet6_dev *idev = pmc->idev;
2120
2121 /* no more filters for this source */
2122 if (psf_prev)
2123 psf_prev->sf_next = psf->sf_next;
2124 else
2125 pmc->mca_sources = psf->sf_next;
2126 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2127 !mld_in_v1_mode(idev)) {
2128 psf->sf_crcount = idev->mc_qrv;
2129 psf->sf_next = pmc->mca_tomb;
2130 pmc->mca_tomb = psf;
2131 rv = 1;
2132 } else
2133 kfree(psf);
2134 }
2135 return rv;
2136 }
2137
2138 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2139 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2140 int delta)
2141 {
2142 struct ifmcaddr6 *pmc;
2143 int changerec = 0;
2144 int i, err;
2145
2146 if (!idev)
2147 return -ENODEV;
2148 read_lock_bh(&idev->lock);
2149 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2150 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2151 break;
2152 }
2153 if (!pmc) {
2154 /* MCA not found?? bug */
2155 read_unlock_bh(&idev->lock);
2156 return -ESRCH;
2157 }
2158 spin_lock_bh(&pmc->mca_lock);
2159 sf_markstate(pmc);
2160 if (!delta) {
2161 if (!pmc->mca_sfcount[sfmode]) {
2162 spin_unlock_bh(&pmc->mca_lock);
2163 read_unlock_bh(&idev->lock);
2164 return -EINVAL;
2165 }
2166 pmc->mca_sfcount[sfmode]--;
2167 }
2168 err = 0;
2169 for (i = 0; i < sfcount; i++) {
2170 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2171
2172 changerec |= rv > 0;
2173 if (!err && rv < 0)
2174 err = rv;
2175 }
2176 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2177 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2178 pmc->mca_sfcount[MCAST_INCLUDE]) {
2179 struct ip6_sf_list *psf;
2180
2181 /* filter mode change */
2182 pmc->mca_sfmode = MCAST_INCLUDE;
2183 pmc->mca_crcount = idev->mc_qrv;
2184 idev->mc_ifc_count = pmc->mca_crcount;
2185 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2186 psf->sf_crcount = 0;
2187 mld_ifc_event(pmc->idev);
2188 } else if (sf_setstate(pmc) || changerec)
2189 mld_ifc_event(pmc->idev);
2190 spin_unlock_bh(&pmc->mca_lock);
2191 read_unlock_bh(&idev->lock);
2192 return err;
2193 }
2194
2195 /*
2196 * Add multicast single-source filter to the interface list
2197 */
2198 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2199 const struct in6_addr *psfsrc)
2200 {
2201 struct ip6_sf_list *psf, *psf_prev;
2202
2203 psf_prev = NULL;
2204 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2205 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2206 break;
2207 psf_prev = psf;
2208 }
2209 if (!psf) {
2210 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2211 if (!psf)
2212 return -ENOBUFS;
2213
2214 psf->sf_addr = *psfsrc;
2215 if (psf_prev) {
2216 psf_prev->sf_next = psf;
2217 } else
2218 pmc->mca_sources = psf;
2219 }
2220 psf->sf_count[sfmode]++;
2221 return 0;
2222 }
2223
2224 static void sf_markstate(struct ifmcaddr6 *pmc)
2225 {
2226 struct ip6_sf_list *psf;
2227 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2228
2229 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2230 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2231 psf->sf_oldin = mca_xcount ==
2232 psf->sf_count[MCAST_EXCLUDE] &&
2233 !psf->sf_count[MCAST_INCLUDE];
2234 } else
2235 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2236 }
2237
2238 static int sf_setstate(struct ifmcaddr6 *pmc)
2239 {
2240 struct ip6_sf_list *psf, *dpsf;
2241 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2242 int qrv = pmc->idev->mc_qrv;
2243 int new_in, rv;
2244
2245 rv = 0;
2246 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2247 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2248 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2249 !psf->sf_count[MCAST_INCLUDE];
2250 } else
2251 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2252 if (new_in) {
2253 if (!psf->sf_oldin) {
2254 struct ip6_sf_list *prev = NULL;
2255
2256 for (dpsf = pmc->mca_tomb; dpsf;
2257 dpsf = dpsf->sf_next) {
2258 if (ipv6_addr_equal(&dpsf->sf_addr,
2259 &psf->sf_addr))
2260 break;
2261 prev = dpsf;
2262 }
2263 if (dpsf) {
2264 if (prev)
2265 prev->sf_next = dpsf->sf_next;
2266 else
2267 pmc->mca_tomb = dpsf->sf_next;
2268 kfree(dpsf);
2269 }
2270 psf->sf_crcount = qrv;
2271 rv++;
2272 }
2273 } else if (psf->sf_oldin) {
2274 psf->sf_crcount = 0;
2275 /*
2276 * add or update "delete" records if an active filter
2277 * is now inactive
2278 */
2279 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2280 if (ipv6_addr_equal(&dpsf->sf_addr,
2281 &psf->sf_addr))
2282 break;
2283 if (!dpsf) {
2284 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2285 if (!dpsf)
2286 continue;
2287 *dpsf = *psf;
2288 /* pmc->mca_lock held by callers */
2289 dpsf->sf_next = pmc->mca_tomb;
2290 pmc->mca_tomb = dpsf;
2291 }
2292 dpsf->sf_crcount = qrv;
2293 rv++;
2294 }
2295 }
2296 return rv;
2297 }
2298
2299 /*
2300 * Add multicast source filter list to the interface list
2301 */
2302 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2303 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2304 int delta)
2305 {
2306 struct ifmcaddr6 *pmc;
2307 int isexclude;
2308 int i, err;
2309
2310 if (!idev)
2311 return -ENODEV;
2312 read_lock_bh(&idev->lock);
2313 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2314 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2315 break;
2316 }
2317 if (!pmc) {
2318 /* MCA not found?? bug */
2319 read_unlock_bh(&idev->lock);
2320 return -ESRCH;
2321 }
2322 spin_lock_bh(&pmc->mca_lock);
2323
2324 sf_markstate(pmc);
2325 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2326 if (!delta)
2327 pmc->mca_sfcount[sfmode]++;
2328 err = 0;
2329 for (i = 0; i < sfcount; i++) {
2330 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2331 if (err)
2332 break;
2333 }
2334 if (err) {
2335 int j;
2336
2337 if (!delta)
2338 pmc->mca_sfcount[sfmode]--;
2339 for (j = 0; j < i; j++)
2340 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2341 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2342 struct ip6_sf_list *psf;
2343
2344 /* filter mode change */
2345 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2346 pmc->mca_sfmode = MCAST_EXCLUDE;
2347 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2348 pmc->mca_sfmode = MCAST_INCLUDE;
2349 /* else no filters; keep old mode for reports */
2350
2351 pmc->mca_crcount = idev->mc_qrv;
2352 idev->mc_ifc_count = pmc->mca_crcount;
2353 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2354 psf->sf_crcount = 0;
2355 mld_ifc_event(idev);
2356 } else if (sf_setstate(pmc))
2357 mld_ifc_event(idev);
2358 spin_unlock_bh(&pmc->mca_lock);
2359 read_unlock_bh(&idev->lock);
2360 return err;
2361 }
2362
2363 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2364 {
2365 struct ip6_sf_list *psf, *nextpsf;
2366
2367 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2368 nextpsf = psf->sf_next;
2369 kfree(psf);
2370 }
2371 pmc->mca_tomb = NULL;
2372 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2373 nextpsf = psf->sf_next;
2374 kfree(psf);
2375 }
2376 pmc->mca_sources = NULL;
2377 pmc->mca_sfmode = MCAST_EXCLUDE;
2378 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2379 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2380 }
2381
2382
2383 static void igmp6_join_group(struct ifmcaddr6 *ma)
2384 {
2385 unsigned long delay;
2386
2387 if (ma->mca_flags & MAF_NOREPORT)
2388 return;
2389
2390 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2391
2392 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2393
2394 spin_lock_bh(&ma->mca_lock);
2395 if (del_timer(&ma->mca_timer)) {
2396 atomic_dec(&ma->mca_refcnt);
2397 delay = ma->mca_timer.expires - jiffies;
2398 }
2399
2400 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2401 atomic_inc(&ma->mca_refcnt);
2402 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2403 spin_unlock_bh(&ma->mca_lock);
2404 }
2405
2406 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2407 struct inet6_dev *idev)
2408 {
2409 int err;
2410
2411 /* callers have the socket lock and rtnl lock
2412 * so no other readers or writers of iml or its sflist
2413 */
2414 if (!iml->sflist) {
2415 /* any-source empty exclude case */
2416 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2417 }
2418 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2419 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2420 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2421 iml->sflist = NULL;
2422 return err;
2423 }
2424
2425 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2426 {
2427 if (mld_in_v1_mode(ma->idev)) {
2428 if (ma->mca_flags & MAF_LAST_REPORTER)
2429 igmp6_send(&ma->mca_addr, ma->idev->dev,
2430 ICMPV6_MGM_REDUCTION);
2431 } else {
2432 mld_add_delrec(ma->idev, ma);
2433 mld_ifc_event(ma->idev);
2434 }
2435 }
2436
2437 static void mld_gq_timer_expire(unsigned long data)
2438 {
2439 struct inet6_dev *idev = (struct inet6_dev *)data;
2440
2441 idev->mc_gq_running = 0;
2442 mld_send_report(idev, NULL);
2443 in6_dev_put(idev);
2444 }
2445
2446 static void mld_ifc_timer_expire(unsigned long data)
2447 {
2448 struct inet6_dev *idev = (struct inet6_dev *)data;
2449
2450 mld_send_cr(idev);
2451 if (idev->mc_ifc_count) {
2452 idev->mc_ifc_count--;
2453 if (idev->mc_ifc_count)
2454 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2455 }
2456 in6_dev_put(idev);
2457 }
2458
2459 static void mld_ifc_event(struct inet6_dev *idev)
2460 {
2461 if (mld_in_v1_mode(idev))
2462 return;
2463 idev->mc_ifc_count = idev->mc_qrv;
2464 mld_ifc_start_timer(idev, 1);
2465 }
2466
2467
2468 static void igmp6_timer_handler(unsigned long data)
2469 {
2470 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2471
2472 if (mld_in_v1_mode(ma->idev))
2473 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2474 else
2475 mld_send_report(ma->idev, ma);
2476
2477 spin_lock(&ma->mca_lock);
2478 ma->mca_flags |= MAF_LAST_REPORTER;
2479 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2480 spin_unlock(&ma->mca_lock);
2481 ma_put(ma);
2482 }
2483
2484 /* Device changing type */
2485
2486 void ipv6_mc_unmap(struct inet6_dev *idev)
2487 {
2488 struct ifmcaddr6 *i;
2489
2490 /* Install multicast list, except for all-nodes (already installed) */
2491
2492 read_lock_bh(&idev->lock);
2493 for (i = idev->mc_list; i; i = i->next)
2494 igmp6_group_dropped(i);
2495 read_unlock_bh(&idev->lock);
2496 }
2497
2498 void ipv6_mc_remap(struct inet6_dev *idev)
2499 {
2500 ipv6_mc_up(idev);
2501 }
2502
2503 /* Device going down */
2504
2505 void ipv6_mc_down(struct inet6_dev *idev)
2506 {
2507 struct ifmcaddr6 *i;
2508
2509 /* Withdraw multicast list */
2510
2511 read_lock_bh(&idev->lock);
2512 mld_ifc_stop_timer(idev);
2513 mld_gq_stop_timer(idev);
2514 mld_dad_stop_timer(idev);
2515
2516 for (i = idev->mc_list; i; i = i->next)
2517 igmp6_group_dropped(i);
2518 read_unlock_bh(&idev->lock);
2519
2520 mld_clear_delrec(idev);
2521 }
2522
2523 static void ipv6_mc_reset(struct inet6_dev *idev)
2524 {
2525 idev->mc_qrv = sysctl_mld_qrv;
2526 idev->mc_qi = MLD_QI_DEFAULT;
2527 idev->mc_qri = MLD_QRI_DEFAULT;
2528 idev->mc_v1_seen = 0;
2529 idev->mc_maxdelay = unsolicited_report_interval(idev);
2530 }
2531
2532 /* Device going up */
2533
2534 void ipv6_mc_up(struct inet6_dev *idev)
2535 {
2536 struct ifmcaddr6 *i;
2537
2538 /* Install multicast list, except for all-nodes (already installed) */
2539
2540 read_lock_bh(&idev->lock);
2541 ipv6_mc_reset(idev);
2542 for (i = idev->mc_list; i; i = i->next)
2543 igmp6_group_added(i);
2544 read_unlock_bh(&idev->lock);
2545 }
2546
2547 /* IPv6 device initialization. */
2548
2549 void ipv6_mc_init_dev(struct inet6_dev *idev)
2550 {
2551 write_lock_bh(&idev->lock);
2552 spin_lock_init(&idev->mc_lock);
2553 idev->mc_gq_running = 0;
2554 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2555 (unsigned long)idev);
2556 idev->mc_tomb = NULL;
2557 idev->mc_ifc_count = 0;
2558 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2559 (unsigned long)idev);
2560 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2561 (unsigned long)idev);
2562 ipv6_mc_reset(idev);
2563 write_unlock_bh(&idev->lock);
2564 }
2565
2566 /*
2567 * Device is about to be destroyed: clean up.
2568 */
2569
2570 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2571 {
2572 struct ifmcaddr6 *i;
2573
2574 /* Deactivate timers */
2575 ipv6_mc_down(idev);
2576
2577 /* Delete all-nodes address. */
2578 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2579 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2580 * fail.
2581 */
2582 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2583
2584 if (idev->cnf.forwarding)
2585 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2586
2587 write_lock_bh(&idev->lock);
2588 while ((i = idev->mc_list) != NULL) {
2589 idev->mc_list = i->next;
2590 write_unlock_bh(&idev->lock);
2591
2592 igmp6_group_dropped(i);
2593 ma_put(i);
2594
2595 write_lock_bh(&idev->lock);
2596 }
2597 write_unlock_bh(&idev->lock);
2598 }
2599
2600 #ifdef CONFIG_PROC_FS
2601 struct igmp6_mc_iter_state {
2602 struct seq_net_private p;
2603 struct net_device *dev;
2604 struct inet6_dev *idev;
2605 };
2606
2607 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2608
2609 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2610 {
2611 struct ifmcaddr6 *im = NULL;
2612 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2613 struct net *net = seq_file_net(seq);
2614
2615 state->idev = NULL;
2616 for_each_netdev_rcu(net, state->dev) {
2617 struct inet6_dev *idev;
2618 idev = __in6_dev_get(state->dev);
2619 if (!idev)
2620 continue;
2621 read_lock_bh(&idev->lock);
2622 im = idev->mc_list;
2623 if (im) {
2624 state->idev = idev;
2625 break;
2626 }
2627 read_unlock_bh(&idev->lock);
2628 }
2629 return im;
2630 }
2631
2632 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2633 {
2634 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2635
2636 im = im->next;
2637 while (!im) {
2638 if (likely(state->idev != NULL))
2639 read_unlock_bh(&state->idev->lock);
2640
2641 state->dev = next_net_device_rcu(state->dev);
2642 if (!state->dev) {
2643 state->idev = NULL;
2644 break;
2645 }
2646 state->idev = __in6_dev_get(state->dev);
2647 if (!state->idev)
2648 continue;
2649 read_lock_bh(&state->idev->lock);
2650 im = state->idev->mc_list;
2651 }
2652 return im;
2653 }
2654
2655 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2656 {
2657 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2658 if (im)
2659 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2660 --pos;
2661 return pos ? NULL : im;
2662 }
2663
2664 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2665 __acquires(RCU)
2666 {
2667 rcu_read_lock();
2668 return igmp6_mc_get_idx(seq, *pos);
2669 }
2670
2671 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2672 {
2673 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2674
2675 ++*pos;
2676 return im;
2677 }
2678
2679 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2680 __releases(RCU)
2681 {
2682 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2683
2684 if (likely(state->idev != NULL)) {
2685 read_unlock_bh(&state->idev->lock);
2686 state->idev = NULL;
2687 }
2688 state->dev = NULL;
2689 rcu_read_unlock();
2690 }
2691
2692 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2693 {
2694 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2695 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2696
2697 seq_printf(seq,
2698 "%-4d %-15s %pi6 %5d %08X %ld\n",
2699 state->dev->ifindex, state->dev->name,
2700 &im->mca_addr,
2701 im->mca_users, im->mca_flags,
2702 (im->mca_flags&MAF_TIMER_RUNNING) ?
2703 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2704 return 0;
2705 }
2706
2707 static const struct seq_operations igmp6_mc_seq_ops = {
2708 .start = igmp6_mc_seq_start,
2709 .next = igmp6_mc_seq_next,
2710 .stop = igmp6_mc_seq_stop,
2711 .show = igmp6_mc_seq_show,
2712 };
2713
2714 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2715 {
2716 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2717 sizeof(struct igmp6_mc_iter_state));
2718 }
2719
2720 static const struct file_operations igmp6_mc_seq_fops = {
2721 .owner = THIS_MODULE,
2722 .open = igmp6_mc_seq_open,
2723 .read = seq_read,
2724 .llseek = seq_lseek,
2725 .release = seq_release_net,
2726 };
2727
2728 struct igmp6_mcf_iter_state {
2729 struct seq_net_private p;
2730 struct net_device *dev;
2731 struct inet6_dev *idev;
2732 struct ifmcaddr6 *im;
2733 };
2734
2735 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2736
2737 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2738 {
2739 struct ip6_sf_list *psf = NULL;
2740 struct ifmcaddr6 *im = NULL;
2741 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2742 struct net *net = seq_file_net(seq);
2743
2744 state->idev = NULL;
2745 state->im = NULL;
2746 for_each_netdev_rcu(net, state->dev) {
2747 struct inet6_dev *idev;
2748 idev = __in6_dev_get(state->dev);
2749 if (unlikely(idev == NULL))
2750 continue;
2751 read_lock_bh(&idev->lock);
2752 im = idev->mc_list;
2753 if (likely(im != NULL)) {
2754 spin_lock_bh(&im->mca_lock);
2755 psf = im->mca_sources;
2756 if (likely(psf != NULL)) {
2757 state->im = im;
2758 state->idev = idev;
2759 break;
2760 }
2761 spin_unlock_bh(&im->mca_lock);
2762 }
2763 read_unlock_bh(&idev->lock);
2764 }
2765 return psf;
2766 }
2767
2768 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2769 {
2770 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2771
2772 psf = psf->sf_next;
2773 while (!psf) {
2774 spin_unlock_bh(&state->im->mca_lock);
2775 state->im = state->im->next;
2776 while (!state->im) {
2777 if (likely(state->idev != NULL))
2778 read_unlock_bh(&state->idev->lock);
2779
2780 state->dev = next_net_device_rcu(state->dev);
2781 if (!state->dev) {
2782 state->idev = NULL;
2783 goto out;
2784 }
2785 state->idev = __in6_dev_get(state->dev);
2786 if (!state->idev)
2787 continue;
2788 read_lock_bh(&state->idev->lock);
2789 state->im = state->idev->mc_list;
2790 }
2791 if (!state->im)
2792 break;
2793 spin_lock_bh(&state->im->mca_lock);
2794 psf = state->im->mca_sources;
2795 }
2796 out:
2797 return psf;
2798 }
2799
2800 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2801 {
2802 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2803 if (psf)
2804 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2805 --pos;
2806 return pos ? NULL : psf;
2807 }
2808
2809 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2810 __acquires(RCU)
2811 {
2812 rcu_read_lock();
2813 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2814 }
2815
2816 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2817 {
2818 struct ip6_sf_list *psf;
2819 if (v == SEQ_START_TOKEN)
2820 psf = igmp6_mcf_get_first(seq);
2821 else
2822 psf = igmp6_mcf_get_next(seq, v);
2823 ++*pos;
2824 return psf;
2825 }
2826
2827 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2828 __releases(RCU)
2829 {
2830 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2831 if (likely(state->im != NULL)) {
2832 spin_unlock_bh(&state->im->mca_lock);
2833 state->im = NULL;
2834 }
2835 if (likely(state->idev != NULL)) {
2836 read_unlock_bh(&state->idev->lock);
2837 state->idev = NULL;
2838 }
2839 state->dev = NULL;
2840 rcu_read_unlock();
2841 }
2842
2843 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2844 {
2845 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2846 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2847
2848 if (v == SEQ_START_TOKEN) {
2849 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2850 } else {
2851 seq_printf(seq,
2852 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2853 state->dev->ifindex, state->dev->name,
2854 &state->im->mca_addr,
2855 &psf->sf_addr,
2856 psf->sf_count[MCAST_INCLUDE],
2857 psf->sf_count[MCAST_EXCLUDE]);
2858 }
2859 return 0;
2860 }
2861
2862 static const struct seq_operations igmp6_mcf_seq_ops = {
2863 .start = igmp6_mcf_seq_start,
2864 .next = igmp6_mcf_seq_next,
2865 .stop = igmp6_mcf_seq_stop,
2866 .show = igmp6_mcf_seq_show,
2867 };
2868
2869 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2870 {
2871 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2872 sizeof(struct igmp6_mcf_iter_state));
2873 }
2874
2875 static const struct file_operations igmp6_mcf_seq_fops = {
2876 .owner = THIS_MODULE,
2877 .open = igmp6_mcf_seq_open,
2878 .read = seq_read,
2879 .llseek = seq_lseek,
2880 .release = seq_release_net,
2881 };
2882
2883 static int __net_init igmp6_proc_init(struct net *net)
2884 {
2885 int err;
2886
2887 err = -ENOMEM;
2888 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2889 goto out;
2890 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2891 &igmp6_mcf_seq_fops))
2892 goto out_proc_net_igmp6;
2893
2894 err = 0;
2895 out:
2896 return err;
2897
2898 out_proc_net_igmp6:
2899 remove_proc_entry("igmp6", net->proc_net);
2900 goto out;
2901 }
2902
2903 static void __net_exit igmp6_proc_exit(struct net *net)
2904 {
2905 remove_proc_entry("mcfilter6", net->proc_net);
2906 remove_proc_entry("igmp6", net->proc_net);
2907 }
2908 #else
2909 static inline int igmp6_proc_init(struct net *net)
2910 {
2911 return 0;
2912 }
2913 static inline void igmp6_proc_exit(struct net *net)
2914 {
2915 }
2916 #endif
2917
2918 static int __net_init igmp6_net_init(struct net *net)
2919 {
2920 int err;
2921
2922 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2923 SOCK_RAW, IPPROTO_ICMPV6, net);
2924 if (err < 0) {
2925 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2926 err);
2927 goto out;
2928 }
2929
2930 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2931
2932 err = igmp6_proc_init(net);
2933 if (err)
2934 goto out_sock_create;
2935 out:
2936 return err;
2937
2938 out_sock_create:
2939 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2940 goto out;
2941 }
2942
2943 static void __net_exit igmp6_net_exit(struct net *net)
2944 {
2945 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2946 igmp6_proc_exit(net);
2947 }
2948
2949 static struct pernet_operations igmp6_net_ops = {
2950 .init = igmp6_net_init,
2951 .exit = igmp6_net_exit,
2952 };
2953
2954 int __init igmp6_init(void)
2955 {
2956 return register_pernet_subsys(&igmp6_net_ops);
2957 }
2958
2959 void igmp6_cleanup(void)
2960 {
2961 unregister_pernet_subsys(&igmp6_net_ops);
2962 }
Linux kernel - Deliverables
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